KR102048844B1 - System and Method for Liquid Air Evaporation using Carbon Capture System - Google Patents

Abstract

The present invention by connecting the carbon dioxide capture device to the commercial power plant, to produce environmentally friendly power by separating and removing environmental pollutants contained in the exhaust gas discharged from the power plant, and to produce additional power in connection with the liquid air regasification device The present invention relates to a liquefied air regasification system and method including a carbon dioxide capture device, which can improve separation and removal efficiency of environmental pollutants.
Liquefied air regasification system comprising a carbon dioxide capture device according to the present invention, liquid air regasification device for producing power by regasifying liquid air; A power plant that produces power by burning fuel; And a carbon dioxide capture device for supplying oxygen for combustion of fuel to the power generation plant, wherein the carbon dioxide capture device receives compressed air from the liquid air regasification device to generate pure oxygen and supply it to the power generation plant. Pure oxygen generating means; And a carbon dioxide collector which separates carbon dioxide from carbon dioxide-rich exhaust gas discharged after burning fuel using pure oxygen in the power plant, and discharges carbon dioxide from which carbon dioxide has been separated and removed into the atmosphere. In the plant, electric power is produced through pure oxygen combustion, and clean exhaust gas containing no environmental pollutants is discharged.

Description

System and Method for Liquid Air Evaporation using Carbon Capture System

The present invention by connecting the carbon dioxide capture device to the commercial power plant, to produce environmentally friendly power by separating and removing environmental pollutants contained in the exhaust gas discharged from the power plant, and to produce additional power in conjunction with the liquid air regasification device The present invention relates to a liquefied air regasification system and method including a carbon dioxide capture device, which can improve separation and removal efficiency of environmental pollutants.

Current power systems are centralized systems that match supply and demand in real time. It is a method of supplying base load power in large-scale base load power generation plants such as nuclear power plants and coal-fired power plants, and supplying the generated power to each power demand source through a transmission and distribution network. The base load generation plant continues to run for 24 hours, and also continues to run at a set level of output.

Domestic coal-fired power plants are in charge of base loads along with nuclear power generation, and the proportion is high, accounting for 38% of total coal-fired power generation in 2016.

On the other hand, the exhaust gas emitted from a power plant that uses hydrocarbons as a fuel, such as a coal-fired power plant or a heavy oil power plant, contains a large amount of environmental pollutants such as carbon dioxide and nitrogen oxides, which are major causes of global warming.

Conventional methods for solving the problem that carbon dioxide is contained in the exhaust gas and released into the atmosphere include a pre-combustion separation method in which the carbon contained in the fuel is removed and combusted, and a post-combustion separation in which the carbon dioxide contained in the exhaust gas is removed. There is a way.

Typical pre-combustion separation methods include gasification of coal, which is a fuel of a coal-fired power plant, and steam reforming, followed by removal of carbon dioxide from hydrogen and carbon dioxide, which are products of the reforming reaction. However, as long as air is used for combustion of fuel, various impurities such as nitrogen oxides are discharged together with the exhaust gas after combustion, so the carbon dioxide capture efficiency in the exhaust gas is low.

On the other hand, energy demand patterns of power demand sources vary greatly depending on the season or time of day. For example, during summer, the demand for cooling increases rapidly, resulting in a peak load.

In general, base load power plants are designed for maximum load, producing consistently constant power, and require a lot of time to start up the equipment to increase output. For example, coal-fired power plants require about one day warm up time. That is, the base load power generation plant can only play the role of the base load because the response time to power generation is late, and there are various limitations such as difficult to adjust the output to cope with the peak load required for a relatively short time.

Conventionally, the peak load in a load follow operation method that generates additional power immediately by adjusting the load according to the change in the power supply using a LNG (Liquefied Natural Gas) or heavy oil-based power plant or a pumped power plant. It corresponds to.

However, in the case of LNG or heavy fuel oil power plant, the cost of producing electricity is very high, the initial installation cost and operation cost are high, such as additional power plant, and at least one hour is required for power generation. In the case of a pumped-up power plant, power generation time is shorter than that of LNG or a heavy oil power plant, so it is most suitable for following operation, but there is a geographical limitation in installation because it uses the potential energy of water.

As a solution to the problem of power supply and demand imbalance, it is possible to consider a method of storing surplus power that is discarded at a time when the demand for electricity is low, and then using the peak load when the demand for electricity is rapidly increasing.

As a method of storing power, a Li-ion battery, a sodium-sulfur battery, a NaS battery, a redox flow battery, a super capacitor, a flywheel, Compressed air energy storage (CAES), pumped hydro storage (PHS), and liquid air energy storage (LAES) are emerging.

Energy storage systems are evaluated and applied based on geographic characteristics, energy density, lifetime, installation and operating costs, and stability. Pros and cons of each energy storage system, but the hydrostatic storage method is the most representative energy storage method. Liquid air storage methods are highly commercialized in that they have low geographic constraints, long lifespans, low operating costs and a safe storage method using air.

The basic principle of a liquid air storage (LAES) device is: The gaseous air is compressed and the compressed air is cooled to about −196 ° C. or lower and stored in a liquid state with high energy density. The liquefied air stored in the liquid state is heated to a gaseous state of high pressure, and the turbine is driven by this high-pressure air to produce electric power.

The liquid air storage device stores surplus energy in the form of liquid air when power demand is low, and generates extra power by vaporizing liquid air during peak load with high power demand, thereby eliminating power supply imbalance in the grid. It is expected to be possible.

However, in order to vaporize liquid air to generate electric power, a separate external heat source is required, and in case of using the expansion heat and compressed heat of the air itself without an external heat source, the temperature gradient in the cycle is not large and energy loss is large. There is a problem that the efficiency is low. The process efficiency of the demonstration plant is known to be around 8%.

Therefore, the present invention can improve the separation and removal efficiency of carbon dioxide in the exhaust gas discharged from the coal-fired power plant by using the liquid air regasification device, while also generating clean exhaust gas, while also generating additional power in an eco-friendly manner during peak load. An object of the present invention is to provide a liquefied air regasification system including a carbon dioxide capture device and a liquefied air regasification method.

According to an aspect of the present invention for achieving the above object, a liquid air regasification apparatus for producing power by regasifying liquid air; A power plant that produces power by burning fuel; And a carbon dioxide capture device for supplying oxygen required for combustion of fuel to the power generation plant, wherein the carbon dioxide capture device receives compressed air from the liquid air regasification device to generate pure oxygen and supply it to the power generation plant. Pure oxygen generating means; And a carbon dioxide collector which separates carbon dioxide from carbon dioxide-rich exhaust gas discharged after combustion of fuel using pure oxygen in the power plant, and discharges exhaust gas from which carbon dioxide has been separated and removed to the atmosphere. The plant is provided with a liquefied air regasification system comprising a carbon dioxide capture device in which power is produced through pure oxygen combustion and clean exhaust gases containing no environmental pollutants are emitted.

Preferably, the pure oxygen generating means, the separation membrane for separating the pure oxygen from the compressed air supplied from the liquid air regasification apparatus to supply to the power plant; A pure oxygen combustor for producing combustion heat using the remaining pure oxygen supplied to the power plant; And a compressed air heater that heats the exhaust gas discharged from the pure oxygen combustor and the compressed air supplied to the separator, thereby heating the compressed air to a temperature required by the separator.

Preferably, the pure oxygen generating means, the air separator for separating the compressed air supplied from the liquid air regasification device with pure oxygen and nitrogen to supply pure oxygen to the power plant; A nitrogen compressor for compressing the nitrogen separated in the air separator and supplying it to the power plant; And a nitrogen turbine-generator for producing electric power by using compressed nitrogen heated by combustion heat of the power plant as a working fluid, wherein the nitrogen compressor and the nitrogen turbine-generator are connected to one shaft. Can be.

Preferably, the liquid air regasification device and the power generation plant are connected, waste heat is recovered from the power generation plant and supplied to the liquid air regasification device, and cold heat is recovered from the liquid air regasification device to the power generation plant. And a heat source recovery system for supplying, wherein the heat source recovery system recovers the waste heat from any one of combustion waste, cooling steam, or exhaust gas requiring cooling, which is discharged from the power plant, and the liquid Air is generated and stored using surplus power of the power plant, and load power above the base load can be produced in the liquid air regasification device.

Preferably, the heat source recovery system, heat exchange means for recovering the waste heat by heat exchange; And a heat medium line through which the heat medium circulating through the heat exchange means and the liquid air regasification device flows.

Preferably, the liquid air regasification apparatus comprises: a regasifier for regasifying liquid air; A heater for heating regasification air; And a turbine-generator for producing electric power using the regasified air heated in the heater as a working fluid, wherein the heater is connected to the heat medium line to obtain thermal energy from the power plant to heat the regasified air. Can be.

Preferably, the power plant is a coal-fired power plant that uses coal as fuel, and a boiler for generating steam by burning coal; A high pressure steam turbine for producing electric power using the generated steam as a working fluid; A medium and low pressure steam turbine configured to generate electric power by using the reheated steam as a working fluid after being recycled to the boiler after driving the high pressure steam turbine; And a condenser for condensing the steam discharged after driving the medium and low pressure steam turbine.

Preferably, the exhaust gas that requires cooling is exhaust gas that is discharged after generating the steam, and the heat exchange means is a heat exchange pipe installed in the boiler, and the heat medium flows through the heat exchange pipe to exhaust gas. Heat exchange with the exhaust gas can be cooled and the heat medium can be heated by the heat exchange.

Preferably, the combustion waste requiring cooling is a bottom ash discharged from the boiler, and the heat exchange means may be a bottom ash cooler in which the bottom ash is heat-exchanged by heating the bottom ash and the heat medium is heated; .

Preferably, the heat source recovery system, the heat storage tank for storing the heat medium heated by the heat exchange means; A thermal circulation pump circulating the heated heating medium stored in the thermal storage tank; A three-way valve controlling communication of a heat medium line such that a heated heat medium pressurized by the heat circulation pump is supplied to the liquid air regasification apparatus or recycled to the heat storage tank; And a controller configured to control the three-way valve to recirculate the heat medium to the heat storage tank when the temperature of the heat medium stored in the heat storage tank is lower than a set value.

Preferably, the additional steam is steam extracted from the medium-low pressure steam turbine, and the heat exchange means is a heat exchange pipe installed in the thermal storage tank, and the additional steam flows through the heat exchange pipe. Heat exchange with the heat medium stored in the thermal storage tank, the steam added by the heat exchange is cooled and the heat medium can be heated.

According to another aspect of the present invention for achieving the above object, in the power plant to oxy-fuel fuel to produce power, liquefy and store the air by using the surplus power produced in the power plant, at the power demand When demanding more power than the power produced by the power plant, the waste heat of the power plant is used to vaporize the stored liquid air, and further power is produced using the vaporized regasification air as a working fluid. The plant is supplied with compressed air compressed with the regasification air to generate and supply pure oxygen, and separates carbon dioxide from carbon dioxide-rich exhaust gas discharged after burning fuel using pure oxygen in the power plant. Capture carbon dioxide, releasing carbon dioxide degassed into the atmosphere A liquefied air regasification method using an apparatus is provided.

Preferably, to generate the pure oxygen, the compressed air is passed through a separator to separate pure oxygen, and the combustion heat is generated using the remaining pure oxygen supplied to the power plant, and the separator uses the combustion heat. The compressed air to be supplied can be heated and supplied.

Preferably, the compressed air is separated into pure oxygen and nitrogen to supply pure oxygen to the power plant, and the separated nitrogen is compressed to be heated by the heat of combustion of the power plant to drive additional turbine to produce additional power. have.

Preferably, the liquid air is regasified by heat exchange with a heat medium, and the heat medium is configured to recover waste heat from any one of combustion waste that needs cooling discharged from the power plant, additional steam, or exhaust gas that needs cooling. It can collect and heat.

The liquefied air regasification system and method including the carbon dioxide capture device according to the present invention is capable of environmentally friendly power generation by capturing carbon dioxide in exhaust gas discharged from a coal-fired power plant.

In particular, by releasing a high concentration of carbon dioxide in the exhaust gas through pure oxygen combustion, the recovery rate of carbon dioxide can be increased, the emission of nitrogen oxides can be reduced by reducing the nitrogen fraction, and sensible heat loss can be minimized.

In addition, by linking the liquid air regasification device and the coal-fired power plant, by regasifying the liquid air at the peak load to supply additional power, it is possible to have flexibility in power supply and to solve the power supply imbalance.

Therefore, coal-fired power plants, which were previously only available for base loads, can be used for peak loads.

In addition, since there is no need to additionally build a combined cycle power plant used for the conventional peak load power, by reducing the construction and operation costs accordingly, it is possible to prevent the increase in power generation cost.

As such, while additional power can be produced by linking the liquid air regasification unit and the coal-fired power plant, the amount of environmental pollutants such as carbon dioxide and nitrogen oxides can be reduced compared to the existing facilities.

In addition, by utilizing the compressed air of the liquid air regasification apparatus to obtain pure oxygen, additional power loss can be minimized.

In addition, by using the heat source to recover the heat source from the coal-fired power plant to re-gas the liquid air in the liquid air regasification apparatus, it is possible to minimize the reduction in output of the coal-fired power plant.

In addition, by recovering a heat source of a suitable temperature from the coal-fired power plant, it is possible to solve the difficulties caused by the selection of materials, such as heat exchangers, and to provide a specific linking system and method that can be actually connected.

1 is a schematic diagram illustrating a liquefied air regasification system including a carbon dioxide capture device according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram illustrating a liquefied air regasification system including a carbon dioxide capture device according to a second embodiment of the present invention.
3 is a schematic diagram illustrating a liquefied air regasification system including a carbon dioxide capture device according to a third embodiment of the present invention.
Figure 4 is a schematic diagram showing a liquefied air regasification system including a carbon dioxide capture device according to a fourth embodiment of the present invention.
FIG. 5 is a schematic diagram illustrating a liquefied air regasification system including a carbon dioxide capture device according to a fifth embodiment of the present invention.

In order to fully understand the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are denoted by the same reference numerals as much as possible even if displayed on different drawings. In addition, the following examples may be modified in many different forms, and the scope of the present invention is not limited to the following examples.

Hereinafter, a power generation system and method including a carbon dioxide capture device according to one embodiment of the present invention will be described with reference to FIGS. 1 to 5.

First, a liquefied air regasification system and method including a carbon dioxide capture device according to a first embodiment of the present invention will be described with reference to FIG. 1.

A liquefied air regasification system including a carbon dioxide capture device according to a first embodiment of the present invention, a liquid air storage device; Coal-fired power plant 200; Heat source recovery apparatus 300; And a carbon dioxide collecting device 400.

The liquid air storage device of this embodiment includes an air liquefaction device (not shown) for liquefying air and storing it in a liquid state; And an air regasification apparatus 100 for regasifying the liquid air and generating power using the regasified gas air.

Although not shown in the drawings, the air liquefaction apparatus includes an air compressor (not shown) for compressing air introduced from the outside; A main heat exchanger (not shown) for cooling (liquefying) the compressed air by heat exchange; A pressure reducing valve (not shown) for reducing the air liquefied in the main heat exchanger; And a liquid air storage tank 101 for storing liquefied air.

The air compressor may be configured as a multistage compressor including a series of compressors so as to compress air supplied at room temperature and atmospheric pressure to a target pressure, for example, about 100 bar or more in multiple stages. In the present embodiment, the air compressor may be a three stage compressor including three compressors to compress gas air in three stages.

In addition, an intercooler (not shown) for intermediately cooling the gas air whose temperature has risen in the compression process may be installed at the rear of each compressor.

Compressed air compressed in the air compressor is introduced into the main heat exchanger and liquefied by heat exchange, for example, the compressed air may be cooled to about −184 ° C. by heat exchange and at least in part become liquid.

The pressure reducing valve may reduce the compressed air at least partially liquefied in the main heat exchanger to the storage pressure of the liquid air storage tank 101. In this embodiment, the pressure reducing valve may be an expansion means such as an expansion valve or a Joule-Thompson valve or an expander, and the temperature of the air may be lowered by the Joule-Thomson effect by adiabatic expansion of at least partly liquefied compressed air. . Therefore, the liquefaction yield and storage property of air can be improved. For example, compressed air having a lower temperature of about −184 ° C. in the main heat exchanger may be lowered below −190 ° C. while passing through a pressure reducing valve.

The liquid air storage tank 101 stores the liquid air liquefied while passing through the air liquefaction apparatus, and insulates the liquid air so that the liquid air can be stored in the liquid state while maintaining the cryogenic temperature (for example, about −190 ° C. or lower). It may have been.

For example, the liquid air storage tank 101 may be operated to store liquid air under conditions of about 1 bar to 1.5 bar and about −190 ° C. to −185 ° C.

Liquid air regasification apparatus 100 in the present embodiment, the cryogenic pump 102 for pressurizing the liquid air stored in the liquid air storage tank 101; A regasifier 103 for heating (vaporizing) pressurized liquid air by heat exchange; A heat exchanger 104 for heating the vaporized air in the regasifier 103 by heat exchange; And turbine-generators 106 and 108 for driving the turbine using vaporized gas air and converting the driving force of the turbine into electric power to produce electric power.

Further, in the present embodiment, the liquid air storage tank 101, the cryogenic pump 102, the regasifier 103, the heat exchanger 104 and the turbine-generators 106 and 108 which constitute the liquid air regasification apparatus 100 are provided. ) May be connected by an air line AL, and the liquid air from the liquid air storage tank 101 flows along the air line AL to be regasified, and is used as a working fluid for driving a turbine and generating electric power. do.

The power production efficiency of the turbine-generators 106 and 108 can be improved by increasing the turbine inlet pressure to maximize the differential pressure with the turbine outlet pressure. That is, according to the present embodiment, the cryogenic pump 102 increases the pressure of the liquid air introduced into the turbine to increase the turbine inlet pressure, thereby maximizing the inlet / outlet pressures of the turbine-generators 106 and 108 to produce a power output. Can be increased.

The cryogenic pump 102 of this embodiment can pressurize liquid air stored at a pressure of about 1.5 bar in the liquid air storage tank 101 to a pressure of about 22 bar, and a turbine-generator at a pressure of about 22 bar. Regasification air introduced into 106 and 108 may be expanded while driving the turbine.

As described above, by pressurizing the liquid air to be regasified by the cryogenic pump 102, the turbine inlet / outlet differential pressure can be increased, thereby increasing the amount of power generated. In addition, the compressed air discharged after driving the turbine-generators 106 and 108 or the compressed air remaining after being supplied to the turbine-generators 106 and 108 is supplied to the carbon dioxide collecting device 400 as described below to provide pure oxygen. It is used to generate.

In the regasifier 103 and the heat exchanger 104 of this embodiment, the cold heat of the liquid air is recovered by heat exchange between the liquid air flowing along the air line AL and the refrigerant flowing along the refrigerant line ML. In this case, the entire amount of liquid air recovered from cold heat can be vaporized.

Although not shown in the drawings, the refrigerant line ML may form a cycle connected to a main heat exchanger for liquefying compressed air in the above-described air liquefaction apparatus. That is, the refrigerant flowing along the refrigerant line ML may cool the compressed air in the main heat exchanger of the air liquefaction apparatus with the cold heat recovered from the liquid air in the regasifier 103 and the heat exchanger 104. However, it is not limited thereto.

The turbine-generators 106 and 108 of this embodiment include a primary turbine-generator 106; And a secondary turbine-generator 108; and a two-stage turbine-generator 106 and 108.

That is, the regasification air vaporized while passing through the regasifier 103 and the heat exchanger 104 is first supplied as a working fluid of the primary turbine-generator 106 to produce electric power and then discharged. It may be supplied as a working fluid of the generator 108 to generate power and then discharged.

According to this embodiment, the primary heater 105 is installed in front of the primary turbine-generator 106 and further heats the regasification air supplied to the primary turbine-generator 106; A secondary heater 107 installed at the front of the secondary turbine-generator 108 and further heating regasification air discharged from the primary turbine-generator 106 and supplied to the secondary turbine-generator 108; It further includes.

In this embodiment, the two turbine-generators 106 and 108 are connected in series (series) as an example, but the number of the turbine-generators 106 and 108 is not limited thereto and may be provided with one or more. have. However, one or more heaters 105 and 107 are provided at the front end of the turbine generators 106 and 108, and the regasification air supplied to the turbine generators 106 and 108 is the heaters 105 and 107. It can be supplied after being heated at. In addition, two or more turbine-generators 106 and 108 may be installed in parallel to produce power, respectively. In addition, the primary turbine-generator 106 and the secondary turbine-generator 108 may be operated at the same time, only one of them may be operated, or may be operated in time.

According to the present embodiment, in order to improve the power production efficiency of the power generation turbine, the temperature of the fluid introduced into the turbine is increased together with the method of maximizing the differential pressure between the inlet pressure and the outlet pressure of the turbine as described above. . That is, according to this embodiment, the turbine inlet temperature is raised by further heating the regasification air introduced into the turbine-generators 106 and 108 with the primary heater 105 and the secondary heater 107. It is possible to improve the power generation efficiency of the generators 106 and 108.

The coal-fired power plant 200 generates electric power by driving a turbine using steam boiled with water, and the coal-fired power plant 200 according to the present embodiment can obtain heat for generating steam by burning coal. have.

Coal-fired power generation plant 200 of the present embodiment, the boiler 201 to generate coal combustion heat by burning coal; A high pressure steam turbine 202 for driving the turbine using the steam generated by the heat of combustion as a working fluid and producing electric power using the kinetic energy of the turbine; After driving the high-pressure steam turbine 202 through a reheater (not shown) in the boiler 201 to drive the turbine using the operating temperature of the steam as a working fluid, producing electric power from the kinetic energy of the turbine Low pressure steam turbine 203; A condenser 204 for cooling the steam having a low pressure while driving the medium and low pressure steam turbine 203 to condense it into water; And a feed water pump 205 for recycling the condensed water to the boiler 201.

In the drawings, the high-pressure steam turbine 202 and the medium-low pressure steam turbine 203 are each provided with one example. However, the present invention is not limited thereto, and the high pressure steam turbine 202 and the medium and low pressure steam turbine 203 may be provided at least one according to the capacity of the coal-fired power plant 200.

While passing through the high pressure steam turbine 202 and the medium and low pressure steam turbine 203 of the present embodiment, the steam may be reduced in pressure or pressure and temperature, and some may be condensed.

The boiler 201 of this embodiment may be a circulating fluidized bed boiler.

In addition, although not specifically shown in the drawings, it consists of a pipe (pipe or tube) in which steam or water flows while passing through the inside of the boiler 201, the steam or water flowing in the tube by the heat of combustion is heated or vaporized A heat exchange zone may be provided that includes a superheater and a reheater.

For example, the high pressure steam turbine 202 is connected by a superheater (not shown) in the boiler 201 and the first steam line SL1 to receive steam superheated in the superheater as a working fluid. .

In addition, the medium and low pressure steam turbine 203 is connected to the reheater in the boiler 201 by the second steam line SL2 and receives steam heated in the reheater as a working fluid.

Steam superheated in the superheater is high temperature and high pressure steam, and is supplied to the high pressure steam turbine 202 through the first steam line SL1, and the steam whose temperature and pressure are reduced while driving the high pressure steam turbine 202 is the first steam. It is circulated back to the boiler 201 along the line SL1.

After driving the high-pressure steam turbine 202, the steam recycled to the boiler 201 along the first steam line SL1 is heated again by the heat of combustion in the reheater, and the steam reheated in the reheater is superheated in the superheater. It is medium to low temperature, medium to low pressure rather than steam, and is supplied to the medium and low pressure steam turbine 203 through the second steam line SL2.

The temperature and pressure are lowered while driving the medium and low pressure steam turbine 203, and partly condensed steam may be completely condensed in the condenser 204 and recycled to the boiler 201. Therefore, steam which needs cooling (condensation) discharged from the medium-low pressure steam turbine 203 is supplied to the condenser 204 along the 2nd steam line SL2. In the condenser 204, the low-pressure steam turbine 203 is driven, and the steam supplied to the condenser 204 is cooled along the second steam line SL2 to condense all of them.

The steam condensed in the condenser 204 is pressurized by the feed water pump 205 and recycled to the superheater in the boiler 201.

The heat source recovery apparatus 300 according to the present embodiment recovers thermal energy from the coal-fired power plant 200, supplies the liquid air regasification apparatus 100, and recovers cold heat from the liquid air regasification apparatus 100. It may also be supplied to the coal-fired power plant 200.

In the heat source recovery apparatus 300 of the present embodiment, the heat source recovery apparatus 300 described in the third to fifth embodiments to be described later may be applied.

The carbon dioxide capture device 400 produces pure oxygen from compressed air obtained from the liquid air regasification device 100, and generates pure oxygen, and supplies pure oxygen to the coal-fired power plant 200. ; And carbon dioxide from the liquefied air regasification system including a carbon dioxide capture device and separating carbon dioxide from a carbon dioxide rich exhaust gas containing a high concentration of carbon dioxide by oxyfuel combustion, and containing no environmental pollutants or environmental pollutants. It includes; carbon dioxide collectors (404a, 404b) for discharging the clean exhaust gas containing almost no to the atmosphere.

The carbon dioxide capture device 400 of the present embodiment has pressure and temperature conditions necessary to generate pure oxygen using air.

According to the present embodiment, since the compressed air is supplied from the liquid air regasification apparatus 100 to produce pure oxygen, it is not necessary to provide a separate compression means for producing pure oxygen.

The carbon dioxide capture device 400 of the present embodiment includes a compressed air heater 401 for heating the compressed air obtained from the liquid air regasification device 100; A separation membrane 402 for separating oxygen from the compressed air heated by the compressed air heater 401 and supplying the oxygen to the boiler 201 of the coal-fired power plant 200; And a first carbon dioxide collector 404a for separating and removing carbon dioxide from exhaust gas including high concentration carbon dioxide discharged from the boiler 201.

In addition, the carbon dioxide trapping apparatus 400 of the present embodiment supplies heat to the boiler 201 of the coal-fired power generation plant 200 among the pure oxygen separated by the separator 402 and burns the remaining pure oxygen with fuel to generate heat. Oxy-fuel combustor 403; And a second carbon dioxide collector 404b for separating and removing carbon dioxide from the exhaust gas including the high concentration carbon dioxide discharged from the pure oxygen combustor 403.

In the compressed air heater 401 of the present embodiment, after the secondary turbine-generator 108 of the liquid air regasification apparatus 100 is driven, the compressed air discharged along the air line AL and the pure oxygen combustor 403 ) Heats the exhaust gas containing the high concentration carbon dioxide discharged along the second exhaust gas line BL2 to heat the compressed air to a temperature required by the separation membrane 402.

In the drawing, the compressed air supplied to the compressed air heater 401 is compressed air discharged along the air line AL after driving the secondary turbine-generator 108 of the liquid air regasification apparatus 100. An example is shown. However, the compressed air supplied to the compressed air heater 401 may be compressed air discharged after driving the primary turbine-generator 106 or surplus compressed air remaining after being supplied to the primary turbine-generator 106. have.

For example, the introduction temperature of the compressed air required by the separator 402 may be about 850 ° C., and in the compressed air heater 401, the compressed air may be heated to about 850 ° C. by heat exchange.

The separator 402 of the present embodiment may be an ion conductive membrane. The ion conductive separator can separate oxygen having a purity of 99% or higher from compressed air, but requires high temperature compressed air of about 850 ° C or higher.

That is, according to this embodiment, the liquid to be supplied to the separation membrane 402 in order to generate pure oxygen, without further comprising means for compressing and heating means to meet the introduction conditions required by the separation membrane 402, the liquid By supplying the compressed air discharged from the air regasification apparatus 100, it is possible to produce pure oxygen without consuming additional power.

The pure oxygen generated by the separator 402 is introduced into the boiler 201 of the coal-fired power plant 200 along the first oxygen line OL1.

According to this embodiment, by supplying the pure oxygen produced through the separation membrane 402 for the combustion of fuel to the coal-fired power plant 200, the pure oxygen combustion occurs in the boiler 201, thus from the boiler 201 The exhaust gas is exhausted from carbon dioxide rich exhaust gas with high concentration of carbon dioxide. Therefore, the recovery rate of carbon dioxide separation in the first carbon dioxide collector 404a can be increased.

In addition, in the coal-fired power plant 200 according to the present embodiment, since pure oxygen is used for combustion of fuel instead of air, sensible heat dissipation can be reduced and a high-temperature flame can be generated. Production can be suppressed.

That is, the exhaust gas discharged from the liquefied air regasification system of this embodiment is very low in nitrogen oxide, high in carbon dioxide concentration, and is separated and removed from the carbon dioxide collectors 404a and 404b with high efficiency. Clean emissions with little pollutants are released into the atmosphere.

In addition, in the coal-fired power plant 200 according to the present embodiment, it is also possible to expect the effect of reducing the fuel consumption by raising the temperature of the flame by pure oxygen combustion.

The first carbon dioxide collector 404a is included in the exhaust gas discharged after the pure oxygen combustion from the boiler 201 along the first exhaust gas line BL1 connecting the boiler 201 and the first carbon dioxide collector 404a. The high concentration of carbon dioxide and other components are separated, and clean exhaust gas from which carbon dioxide is separated and released is released into the atmosphere.

In addition, the carbon dioxide separated from the first carbon dioxide collector 404a may be stored in a separate carbon dioxide storage means, and may be supplied to carbon dioxide demand in or out of the system.

In addition, the remaining pure oxygen supplied to the coal-fired power generation plant 200 along the first oxygen line OL1 among the pure oxygen discharged from the separation membrane 402 is the second oxygen branched from the first oxygen line OL1. It is fed to the oxy-fuel combustor 403 via line OL2.

Exhaust gas discharged by pure oxygen combustion from the pure oxygen combustor 403 is transferred to the compressed air heater 401 along the second exhaust gas line BL2.

The temperature is lowered while heating the compressed air to be supplied from the compressed air heater 401 to the separation membrane 402.

The exhaust gas whose temperature is lowered in the compressed air heater 401 is supplied to the second carbon dioxide collector 404b along the second exhaust gas line BL2 connecting the compressed air heater 401 and the second carbon dioxide collector 404b. .

In the second carbon dioxide collector 404b, the compressed air heater 401 separates carbon dioxide contained in the exhaust gas whose temperature is lowered by heat exchange and remaining components other than carbon dioxide.

The exhaust gas discharged from the pure oxygen combustor 403 exhausts carbon dioxide rich exhaust gas having a high carbon dioxide concentration by pure oxygen combustion. Therefore, the recovery rate of carbon dioxide separation in the second carbon dioxide collector 404b can be increased.

Since pure oxygen combustion also occurs in the pure oxygen combustor 403, since the carbon dioxide concentration is high in the exhaust gas discharged from the pure oxygen combustor 403, the carbon dioxide recovery rate in the second carbon dioxide collector 404b can be increased.

In addition, the carbon dioxide separated in the second carbon dioxide collector 404b may be stored in a separate carbon dioxide storage means, and may be supplied to the carbon dioxide demand source in or out of the system.

Next, a liquefied air regasification system and method including a carbon dioxide capture device according to a second embodiment of the present invention will be described with reference to FIG. 2. The liquefied air regasification system and method including the carbon dioxide capture device according to the present embodiment are different from the first embodiment described above in the carbon dioxide capture device 400, in particular, pure oxygen generating means, and the rest of the configuration. The elements and their interactions and operations are within the same scope. Therefore, the description of the same components and their operation will be omitted. Even if the detailed description is omitted, the description and the operating principle of the components denoted by the same reference numerals may be equally applied.

The pure oxygen generating means of the first embodiment supplies pure oxygen to the boiler 201 of the coal-fired power plant 200 by using the separation membrane 402, the pure oxygen combustor 403, and the compressed air heater 401. In the present embodiment, the pure oxygen generating means separates the compressed air transferred from the liquid air regasification apparatus 100 into nitrogen and pure oxygen by using the air separator 410, thereby removing pure oxygen from the coal-fired power plant 200. The difference is in that it supplies to the boiler 201, and produces additional power using the separated nitrogen.

In the present embodiment, the carbon dioxide collecting device 400 drives the turbine in the secondary turbine-generator 108 of the liquid air regasification apparatus 100 and then discharges compressed air discharged along the air line AL. An air separator 410 for separating into; A nitrogen compressor 411 for compressing the nitrogen separated in the air separator 410; And a nitrogen turbine 412 for driving the turbine and producing electric power using the compressed nitrogen compressed by the nitrogen compressor 411 as a working fluid.

The pure oxygen separated in the air separator unit 410 is connected to the boiler 201 through the pure oxygen line OL connecting the air separator 410 and the boiler 201 of the coal-fired power plant 200. Transferred. In the boiler 201, pure oxygen combustion occurs using pure oxygen transferred through the pure oxygen line OL, and there is little nitrogen oxide by pure oxygen combustion, and the exhaust gas containing high concentration carbon dioxide is the first exhaust gas line. It is discharged along BL1, and carbon dioxide is separated and removed from the first carbon dioxide collector 404a.

The nitrogen separated in the air separator 410 is transferred to the nitrogen compressor 411 along the nitrogen line NL connecting the air separator 410 and the nitrogen compressor 411.

The compressed nitrogen compressed by the nitrogen compressor 411 is transferred to the boiler 201 along a nitrogen line NL connecting the nitrogen compressor 411 and the boiler 201, and a heat source is obtained from the boiler 201 to vaporize or heat the same. do.

The nitrogen heated in the boiler 201 is transferred to the nitrogen turbine generator 412 along the nitrogen line NL connecting the boiler 201 and the nitrogen turbine generator 412, and the nitrogen turbine generator 412. Drive the turbine, and the driving force of the turbine is converted to power to produce additional power.

The nitrogen compressor 411 and the nitrogen turbine-generator 412 may be companders connected by one shaft.

The power produced in the nitrogen turbine-generator 412 may be supplied to a power source and used within the system.

Next, a liquefied air regasification system and method including a carbon dioxide capture device according to a third embodiment of the present invention will be described with reference to FIG. 3. The liquefied air regasification system and method including the carbon dioxide capture device of the present embodiment is a configuration of the heat source recovery device 300 in more detail, and can be applied to the heat source recovery device 300 of the first and second embodiments as described above. And the remaining components and their interaction and operation are within the same scope.

Therefore, the liquefied air regasification system and method including the carbon dioxide collection device of the present embodiment will be mainly described the relationship between the heat source recovery device 300 and the heat source recovery device 300 and the remaining components, the same components And the description thereof will be omitted. Although detailed descriptions are omitted, the descriptions and the principles of operation of the components denoted by the same reference signs may be applied in the same manner.

The heat source recovery apparatus 300 according to the present embodiment obtains heat from the coal-fired power generation plant 200 while the heat medium circulates, and forms a cycle to heat the liquid air regasification device 100 to form a cycle. OL1, OL2, OL3); Heat exchange means for heating the heat medium by heat exchange with a heat source discharged from the coal-fired power plant 200; A heat storage tank 301 for storing the heat medium heated by heat exchange in the heat exchange means; A thermal circulation pump 302 which pressurizes the heated heating medium to supply the liquid air regasification apparatus 100; A three-way valve 303 for switching the flow path of the heat medium; A cold heat storage tank 304 for recovering cold heat while supplying heat to the liquid air regasification apparatus 100 to store the cooled heat medium; And a cold heat circulation pump 305 for pressurizing the cooled heat medium to circulate the heat exchange means.

The heat medium of the present embodiment may be oil.

The heat medium heated by the heat exchange in the heat exchange means of this embodiment is stored in the thermal storage tank 301 and regasified when the primary turbine-generator 106 and / or the secondary turbine-generator 108 are operated. May be supplied to the primary heater 105 and / or secondary heater 107 to heat the air, omitting storage to the thermal storage tank 301, and from the heat exchange means to the primary heater 105 and / or It may be fed directly to the secondary heater 107.

Similarly, the heat medium cooled while heating the regasification air in the primary heater 105 and / or the secondary heater 107 may be stored in the cold heat storage tank 304 and then supplied to the heat exchange means as necessary. The storage in the cold heat storage tank 304 may be omitted and may be supplied directly from the primary heater 105 and / or secondary heater 107 to the heat exchange means.

Hereinafter, in the present embodiment, the heated heat medium is stored in the thermal storage tank 301 and is supplied to the primary heater 105 and / or the secondary heater 107 at a required flow rate, and the cooled heat medium is cooled. It will be described by taking an example of being stored in the cold heat storage tank 304 and supplied to the heat exchange means at a required flow rate at a necessary time.

On the other hand, the three-way valve 303 may be controlled by a controller (not shown) not shown, or may be automatically controlled by a control algorithm.

The control logic of the three-way valve 303 of this embodiment is as follows. The heat medium heated by heat exchange in the heat exchange means is stored in the heat storage tank 301 along the heat medium supply line OL, and the heated heat medium pressurized by the heat circulation pump 302 is the primary heater 105. And / or to the secondary heater 107 side. At this time, the three-way valve 303 is connected to the first heating medium supply line (OL2) and / or the thermal circulation pump 302 and the secondary heater 107 connecting the thermal circulation pump 302 and the primary heater 105. The opening and closing is controlled to communicate with the second heat medium supply line OL3 to be connected.

However, the three-way valve 303 is branched from the heat medium supply line OL at the rear end of the heat circulation pump 302 when the temperature of the heated heat medium is lower than the set value, and joined to the flow in which the heat medium is supplied to the heat exchange means. Opening and closing may be controlled to communicate with the heat medium circulation line (OL1).

That is, if the temperature of the heated heat medium is less than the set value, it can be returned to the heat exchange means until the temperature of the heat medium becomes the set value. The temperature of the heat medium can be determined, for example, by measuring the internal temperature of the thermal storage tank 301.

In the heat exchange means of the present embodiment, the combustion waste produced by burning fuel in the boiler 201, for example, the waste heat of the bottom ash (BAH) and the heat medium is heat exchanged so that the heat medium is heated and the bottom ash is cooled Cooler 206;

The bottom ash discharged to the bottom of the boiler 201 is a high temperature of about 600 ~ 800 ℃, it is necessary to cool to discard or to recover and recycle.

According to the present embodiment, by recovering the heat energy of the bottom ash discharged from the boiler 201 and supplying it to the primary heater 105 and the secondary heater 107, a heat source for heating the regasification air, which is a working fluid for producing power It recovers the cold heat of regasification air, heating the regasification air in the primary heater 105 and the secondary heater 107, and utilizes it as cooling heat for cooling a flooring material.

In the boiler 201, the bottom ash and the heat medium may be directly heat exchanged, or indirect heat exchange may be performed by another heat exchange medium between the bottom ash and the heat medium.

As described above, according to the present embodiment, the coal-fired power plant 200 and the liquid air regasification apparatus 100 are connected to each other, and the waste heat of the bottom ash discarded is recovered to supply mutually necessary heat sources and cold heat to each other, thereby providing coal-fired power generation. There is no need for a separate cold heat source for the plant 200 or a separate heat source for the liquid air regasification apparatus 100, and additional power can be produced without lowering the output of the coal-fired power plant 200. Can be.

In addition, in the coal-fired power plant 200 to produce power at the output of the base load, when the peak load or the amount of power required by the power demand more than the amount of power produced in the coal-fired power plant 200, the liquid air storage tank ( The liquid air stored in 101 may be vaporized with the waste heat of the coal-fired power plant 200 to further generate electric power by utilizing the working fluid of the primary turbine-generator 106 and the secondary turbine-generator 108. .

Next, a liquefied air regasification system and method including a carbon dioxide capture device according to a fourth embodiment of the present invention will be described with reference to FIG. 4. The liquefied air regasification system and method including the carbon dioxide capture device according to the present embodiment, compared with the above-described third embodiment, the heat exchange means of the heat source recovery system 300, that is, the apparatus or method for recovering the heat source There is a difference in the remaining components and their interactions and operations within the same scope. Therefore, the description of the same components and their operation will be omitted.

In the third embodiment, as the heat exchange means, a bottom ash cooler 206 for recovering the heat source of the bottom ash discharged from the boiler 201 is provided, whereas the heat exchange means of the present embodiment, as shown in FIG. 4, is a heat source storage tank. There is a difference in that it is a heat exchange pipe (or tube) installed in 301.

In addition, in the third embodiment, the waste heat of the bottom ash discharged from the boiler 201 is utilized as a heat source for heating the heat medium, while in the present embodiment, as shown in FIG. 4, the medium-low pressure steam turbine 203 is used. The difference is in the use of extracted waste steam.

That is, according to this embodiment, some steam from the low-low pressure steam turbine 203 through the bleeding supply line (EL) connecting the heat exchange pipes installed inside the medium-low pressure steam turbine 203 and the heat source storage tank 301. It is supplied to the heat exchange pipe to heat the heat medium stored in the heat source storage tank (301). The heat exchange pipe may be installed to be immersed in the heat medium stored in the thermal storage tank 301.

As in the present embodiment, when supplying a heat source through the additional steam, depending on the power load of the primary turbine-generator 106 and / or the secondary turbine-generator 108 of the liquid air regasification apparatus 100, the heat By regulating the temperature and pressure of the bleed steam supplied to the storage tank 301, the temperature of the heat medium supplied to the primary heater 105 and the secondary heater 107 can be controlled.

Therefore, according to the present embodiment, the process of storing the heated heat medium in the thermal storage tank 301 as in the third embodiment cannot be omitted, but unlike the third embodiment, the thermal circulation pump 302 and The temperature of the heat medium supplied to the liquid air regasification device 100 can be controlled without the need for controlling the three-way valve 303.

The steam whose temperature is lowered while heating the heat medium stored in the thermal storage tank 301 is supplied to the condenser 204, condensed, and then recycled to the boiler 201.

As described above, according to the present embodiment, the coal-fired power plant 200 and the liquid air regasification apparatus 100 are connected to each other, and after the turbine is driven, a medium or low pressure steam turbine, such as steam, which is supplied to the turbine or the remaining steam, By recovering the waste heat of steam extracted from 203, and supplying mutually necessary heat source and cold heat to each other, a separate cold heat source required for the coal-fired power plant 200, or a separate heat source required for the liquid air regasification apparatus 100 It does not require a source and can produce additional power without lowering the output of the coal-fired power plant 200.

In addition, the coal-fired power plant 200 produces power at the output of the base load, and during peak load, the liquid air stored in the liquid air storage tank 101 is vaporized with the waste heat of the coal-fired power plant 200, and It can be used as a working fluid of the turbine-generator 106 and the secondary turbine-generator 108 to further produce power.

Next, a liquefied air regasification system and method including a carbon dioxide capture device according to a fifth embodiment of the present invention will be described with reference to FIG. 5. The liquefied air regasification system and method including the carbon dioxide capture device according to the present embodiment, compared with the above-described third embodiment, the heat exchange means of the heat source recovery system 300, that is, the apparatus or method for recovering the heat source There is a difference in the remaining components and their interactions and operations within the same scope. Therefore, the description of the same components and their operation will be omitted.

In the third embodiment, as the heat exchange means, a floor cooler 206 for recovering the heat source of the floor ash discharged from the boiler 201 is provided, whereas the heat exchange means of the present embodiment, as shown in FIG. There is a difference in that it is a heat exchange pipe (or tube) additionally installed in the).

In addition, in the third embodiment, waste heat of the bottom ash discharged from the boiler 201 is utilized as a heat source for heating the heat medium, while in the present embodiment, as shown in FIG. 5, waste heat of the exhaust gas of the boiler 201 is shown. The difference is that it uses.

In FIG. 5, the heat exchange means which collect | recovers waste heat of exhaust gas and heats a heat medium is shown as an example which is a heat exchange piping further installed in the boiler 201. As shown in FIG. However, the present invention is not limited thereto, and the heat exchange means of the present embodiment may be configured as a form of a heat exchanger additionally installed at the front end of the primary heater 105 and the secondary heater 107.

That is, according to the present embodiment, the exhaust gas discharged from the boiler 201 and the heat medium are heat-exchanged, the heat medium is heated, the exhaust gas is cooled, and the heated heat medium is stored in the thermal storage tank 301.

The exhaust gas needs to be sufficiently cooled and discharged due to problems such as environmental pollution. In the present embodiment, the exhaust gas heat-exchanging with the heat medium has a temperature after generating steam through the above-described superheater and / or reheater. The exhaust gas may be lowered or exhaust gas allocated by distributing a part of the exhaust gas generated by the boiler 201.

That is, even if the heat medium recovers the waste heat of the exhaust gas in this embodiment, the amount of steam produced in the boiler 201 is not reduced.

According to the present embodiment, the heat medium is heated by heat exchange with the exhaust gas, and the heat medium circulation line OL1 is heated until the set temperature is reached by the control of the thermal circulation pump 302 and the three-way valve 303. Can be cycled through.

In addition, the heating of the heat medium in the present embodiment can be made continuously while the boiler 201 is operating.

Thus, according to this embodiment, by linking the coal-fired power plant 200 and the liquid air regasification apparatus 100, by recovering the waste gas waste heat of the boiler 201, by supplying mutually necessary heat source and cold heat, It does not require a separate cold heat source for the coal-fired power plant 200 or a separate heat source for the liquid air regasification apparatus 100, and does not require a power source without degrading the output of the coal-fired power plant 200. Can be produced additionally.

In addition, the coal-fired power plant 200 produces power at the output of the base load, and during peak load, the liquid air stored in the liquid air storage tank 101 is vaporized with the waste heat of the coal-fired power plant 200, and It can be used as a working fluid of the turbine-generator 106 and the secondary turbine-generator 108 to further produce power.

In the above-described third to fifth embodiments, only the embodiment in which the heat medium is heated by heat exchange with any one of flooring material, additional steam and exhaust gas is described. However, the present invention is not limited thereto, and according to the present invention, the heat medium may be heated using any one or more of the bottom ash, additional steam, and exhaust gas as a heat source. That is, the heat exchange means includes a bottom material cooler 206 in which the heat medium exchanges heat with the bottom ash, a heat exchange pipe installed in the thermal storage tank 301 so that the heat medium exchanges with additional steam, and the boiler 201 so that the heat medium heat exchanges with the exhaust gas. It may include any one or more of the heat exchange pipe is installed.

According to the above-described embodiments, the liquid air storage device is linked to the coal-fired power plant 200, that is, a commercial power plant, so that the heat source required for the regasification of the liquid air is generated by the waste heat of the power plant, for example, by combustion. Waste heat of by-products, bleed steam or exhaust gases can be used.

If the steam generated in the boiler 201 is directly used as a heat source for regasification of the liquid air, since the steam generated in the boiler 201 is at a high temperature and high pressure, the material of the heat exchange means for recovering the heat of the steam and Since it affects the thickness, it is limited in designing the heat exchange means, and since a part of steam to be supplied to the high-pressure steam turbine 202 is utilized, problems such as greatly lowering the output of the power plant occur.

In addition, when the exhaust gas at the rear of the gas turbine, which generates electricity by using the exhaust gas as a working fluid, is directly used as a heat source for regasification of the liquid air, a fan for supplying the exhaust gas of about 600 ° C. or more to the heat exchange means is provided. It is practically impossible to manufacture a supply means such as), and therefore, there is a disadvantage in that efficiency is low in that a heat source can be secured only by indirect heat exchange.

However, according to the present invention, as described above, the waste heat of the bottom ash discarded from the boiler 201, the bleeding of the medium and low pressure steam turbine 203, and the waste gas waste heat after generating steam in the boiler 201 are recovered. By recovering a heat source at an appropriate temperature and pressure, it is possible to improve the difficulty of selecting materials, and to continuously secure and accumulate a heat source from the power plant to greatly reduce the power output of the power plant and to reduce the efficiency.

In particular, the heat source can be stored while the commercial power plant is in operation at low power, such as late-night hours, and used during the regasification process of liquid air, thus saving the heat source without receiving additional heat source from the commercial power plant. The power can be generated by itself, so that at peak loads, additional power can be produced without compromising the output of a commercial power plant, balancing power supply and demand.

In addition, by using surplus electricity generated in a power plant that is continuously operated as a base load, for example, surplus power produced at night time, the air compressor to generate the liquid air of the liquid air storage device is operated to turn the air into liquid Stored in state and then at peak load, for example during the day time, the stored liquid air can be regasified using waste heat from the power plant to produce additional power.

Therefore, according to the present invention, by connecting the power plant and the liquid air storage device can not only supply the power required for peak load, but also add a peak load power plant with high initial cost and operation cost, such as the existing combined cycle power plant As it does not need to be constructed or operated, the cost of power generation is prevented from rising.

In addition, if additionally connected to renewable energy, such as wind and solar, it will be able to solve the problem of the intermittent supply of renewable energy.

Further, according to the present invention, by linking a commercial power plant and a liquid air storage device, since the liquid air storage device does not include a compression / condensation process such as an organic Rankine cycle, cooling heat of a heat source or a liquid air storage device obtained from a commercial power plant. This compression / condensation process can solve the problem that exergy destruction is not progressed and the actual efficiency improvement does not occur, and it is easy to use because the system configuration and operation are simple.

Meanwhile, the air regasified in the liquid air regasification apparatus 100 may be utilized to generate electric power by driving the turbine-generators 106 and 108, and may be separated into nitrogen and oxygen to be used for pure oxygen combustion and nitrogen power generation processes. It is also possible to improve power generation efficiency and output.

In addition, according to the present invention, by using the carbon dioxide capture device 400, it is possible to produce power by pure oxygen combustion, it is possible to discharge the clean exhaust gas into the atmosphere, it is possible to environmentally friendly power generation.

As described above, the embodiments of the present invention have been described, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention can be embodied by those skilled in the art. It is self-evident to. The foregoing embodiments are, therefore, to be regarded in an illustrative rather than a restrictive sense, and thus, the invention is not limited to the above description, and may vary within the scope of the appended claims and their equivalents.

100: liquid air regasification device
101: liquid air storage tank
103: regasifier
104: heat exchanger
105, 107: heater
106, 108: turbine-generator
200: coal-fired power plant
201: boiler
202: high pressure steam turbine
203: medium and low pressure steam turbine
206: Flooring Cooler
300: heat source recovery device
301: thermal storage tank
304: cold heat storage tank
400: carbon dioxide capture device
401: compressed air heater
402: separator
403: Oxygen Combustor
410: air separator
411: Nitrogen Compressor
412: nitrogen turbine generator
AL: Air Flow Line
ML: Refrigerant Flow Line
OL: Heating fluid line
SL: Steam Flow Line
EL: additional flow line

Claims (13)

A liquid air regasification device for regenerating liquid air to produce electric power;
A power plant that produces power by burning fuel; And
A carbon dioxide capture device for supplying oxygen required for combustion of fuel to the power plant; And
Connect the liquid air regasification device and the power generation plant, recover waste heat from the power generation plant, supply the waste air to the liquid air regasification device, recover the heat from the liquid air regasification device, and recover the heat source supplied to the power generation plant. The system further includes;
The carbon dioxide collecting device,
Pure oxygen generation means for receiving compressed air from the liquid air regasification device to generate pure oxygen and supply it to the power plant; And
And a carbon dioxide collector which separates carbon dioxide from carbon dioxide-rich exhaust gas discharged after combustion of fuel using pure oxygen in the power plant, and discharges exhaust gas from which carbon dioxide has been separated and removed into the atmosphere.
In the power plant, power is produced through oxy-fuel combustion, and clean exhaust gas containing no environmental pollutants is discharged,
The heat source recovery system,
Heat exchange means for recovering the waste heat by heat exchange;
A thermal circulation pump for circulating the heat medium heated by the heat exchange means;
A heat storage tank storing heat medium heated by the heat exchange means;
A three-way valve controlling communication of a heat medium line such that the heated heat medium pressurized by the heat circulation pump is supplied to the liquid air regasification apparatus or recycled to the heat storage tank; And
And a control unit which controls the three-way valve to recirculate the heat medium to the heat storage tank when the temperature of the heat medium stored in the heat storage tank is lower than a set value. The method according to claim 1,
The pure oxygen generating means,
A separation membrane for separating pure oxygen from the compressed air supplied from the liquid air regasification apparatus and supplying it to the power plant;
A pure oxygen combustor for producing combustion heat using the remaining pure oxygen supplied to the power plant; And
Liquefied air including a carbon dioxide capture device, comprising; a compressed air heater for heat-exchanging the exhaust gas discharged from the oxy-fuel combustor and the compressed air supplied to the separation membrane, and heats the compressed air to the temperature required by the separation membrane Regasification system. The method according to claim 1,
The pure oxygen generating means,
An air separator for separating the compressed air supplied from the liquid air regasification device into pure oxygen and nitrogen and supplying pure oxygen to the power plant;
A nitrogen compressor for compressing the nitrogen separated in the air separator and supplying it to the power plant; And
And a nitrogen turbine-generator for producing electric power using compressed nitrogen heated by combustion heat of the power plant as a working fluid.
And the nitrogen compressor and the nitrogen turbine-generator are companders connected by one shaft, wherein the liquefied air regasification system comprises a carbon dioxide capture device. The method according to claim 1,
The heat source recovery system recovers waste heat from any one of combustion waste that needs to be cooled from the power plant, additional steam, or exhaust gas that needs to be cooled,
And the liquid air is generated and stored using surplus power of the power plant, and a load power of at least a base load is produced in the liquid air regasification device. delete The method according to claim 4,
The liquid air regasification device,
A regasifier for regasifying liquid air;
A heater for heating regasification air; And
And a turbine-generator configured to generate electric power using the regasified air heated in the heater as a working fluid.
And the heater comprises a carbon dioxide capture device connected to the heat medium line to obtain thermal energy from the power plant to heat the regasified air. The method according to claim 4,
The power plant is a coal-fired power plant using coal as fuel,
A boiler that burns coal to produce steam;
A high pressure steam turbine for producing electric power using the generated steam as a working fluid;
A medium and low pressure steam turbine configured to generate electric power by using the reheated steam as a working fluid after being recycled to the boiler after driving the high pressure steam turbine; And
And a condenser for condensing the steam discharged after driving the medium and low pressure steam turbine. The method according to claim 7,
The exhaust gas that needs cooling is exhaust gas that is discharged after generating the steam,
The heat exchange means is a heat exchange pipe installed in the boiler, wherein the heat medium flows through the heat exchange pipe to exchange heat with the exhaust gas, and the exhaust gas is cooled by the heat exchange, and the heat medium is liquefied, including a carbon dioxide collecting device. Air regasification system. The method according to claim 7,
The combustion waste requiring cooling is bottom ash discharged from the boiler,
The heat exchange means, a bottom ash cooler that the bottom ash and the heat medium exchange heat, the bottom ash is cooled and the heat medium is heated; liquefied air regasification system comprising a carbon dioxide capture device. delete The method according to claim 7,
The additional steam is steam extracted from the medium and low pressure steam turbine,
The heat exchange means is a heat exchange pipe installed inside the thermal storage tank, wherein the additional steam flows through the heat exchange pipe to exchange heat with the heat medium stored in the thermal storage tank, and the steam extracted by the heat exchange is cooled. And the heating medium is heated, the liquefied air regasification system comprising a carbon dioxide capture device. In the power plant to oxy-fuel fuel to produce electricity,
Liquefied and stored air using surplus power produced in the power plant,
When the power demand demands more power than the power generated by the power plant, the waste heat of the power plant is used to vaporize the stored liquid air, and produce additional power by using the vaporized regasification air as a working fluid. ,
The power plant is supplied with compressed air compressed with the regasification air to generate and supply pure oxygen,
Regasification of liquefied air using a carbon dioxide capture device, which separates carbon dioxide from carbon dioxide-rich exhaust gas discharged after combustion of fuel using pure oxygen in the power plant, and releases the carbon dioxide separated and removed to the atmosphere. Way. The method according to claim 12,
The liquid air is regasified by heat exchange with the heat medium,
And the heat medium recovers and heats the waste heat from any one of combustion waste that needs cooling from the power plant, additional steam, or exhaust gas that needs cooling, and reheats the liquefied air using the carbon dioxide capture device.

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