CN110259531B - Combined power generation system based on waste incineration waste heat and photo-thermal and operation method thereof - Google Patents
Combined power generation system based on waste incineration waste heat and photo-thermal and operation method thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
- F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
The invention provides a waste incineration waste heat and photo-thermal based combined power generation system and an operation method thereof, which can avoid high-temperature corrosion of flue gas of a waste heat boiler superheater, simultaneously enlarge the applicable region of photo-thermal power generation and improve the thermoelectric conversion efficiency. The steam turbine generator set system comprises a steam turbine high-pressure cylinder, a coupling, a steam turbine medium-low pressure cylinder, a low-pressure heater, a medium-pressure deaerator, a large-lift water feed pump and a small-lift water feed pump; the waste incineration waste heat boiler system comprises an economizer, a steam pocket, a water-cooled wall, an evaporator and a waste heat boiler superheater; valves are arranged at the inlet and outlet of the large-lift water feed pump and the small-lift water feed pump; a valve is arranged at an inlet of the solar superheater; a valve is arranged at the outlet of the solar reheater; a valve is arranged on the medium-temperature and medium-pressure steam bypass pipeline; the outlet of the solar reheater and the medium-temperature medium-pressure steam bypass pipeline are connected with the medium-low pressure cylinder of the steam turbine; the inlet and the outlet of the solar preheater are provided with valves; a valve is arranged on the water bypass pipeline.
Description
Technical Field
The invention relates to a waste incineration waste heat and photo-thermal based combined power generation system and an operation method thereof.
Background
With the continuous development of urban economic construction and the continuous improvement of the living standard of people, the harmless treatment of domestic garbage becomes an urgent social problem. The incineration treatment technology of the garbage has the advantages of good harmless effect, high reduction degree, capability of recycling energy for power generation and the like, and is applied more and more in recent years. Along with the drop of households, the construction and the operation of domestic middle and large-sized urban waste incineration power station projects and the reduction of waste treatment subsidies year by year, the original purpose of the waste incineration power station for treating waste is relatively weakened, and the method inevitably selects the main steam parameters of the waste incineration boiler for improving the economic benefit of the waste incineration power station.
Solar thermal power generation refers to a technology of concentrating sunlight and converting it into high-temperature heat energy of a working fluid, and then converting it into electric energy by a conventional heat engine or other power generation technology. After more than 30 years of research and accumulation of practical operation experience, the current solar thermal power generation technology makes great progress and breakthrough, and the cost of key equipment of a power station is greatly reduced. In recent years, due to the pressure of environment and resources, development of renewable energy sources is globally prosperous, and solar thermal power generation technology with low cost potential also enters a rapid development period.
The solar energy supply is unstable and discontinuous, and the thermal power generation system needs to operate stably. To solve this conflict, there are two main solutions: one is to dispose the energy storage system in the system, store the solar energy collected, in order to provide the heat energy for the power station at night or when cloudy weather, guarantee the continuous electricity generation; another scheme is to form a complementary power generation system by solar energy and other energy sources, and when the solar energy is not supplied enough, the other energy sources supply energy sources, so that the continuous and stable operation of the system can be ensured, as shown in the chinese patent with application number 200920047827.2 entitled coastal beach solar photovoltaic power generation and wind power generation complementary power supply device. However, solar photothermal power generation has certain requirements on the total radiation intensity of solar energy, is not suitable for solar photothermal power generation in areas with poor solar energy resources, and is low in thermoelectric conversion efficiency in areas where solar energy is available by independently adopting solar photothermal power generation.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a combined power generation system based on waste incineration waste heat and photo-thermal and an operation method thereof, which have a reasonable structure, can avoid the high-temperature corrosion of flue gas of a waste heat boiler superheater, simultaneously expand the applicable region of photo-thermal power generation and improve the thermoelectric conversion efficiency.
The technical scheme adopted by the invention for solving the problems is as follows: a combined power generation system based on waste incineration waste heat and photo-thermal comprises a waste incineration waste heat boiler system, a solar heat exchange system and a turbine generator set system; the steam turbine generator unit system comprises a steam turbine high-pressure cylinder, a coupling, a steam turbine medium-low pressure cylinder, a low-pressure heater and a medium-pressure deaerator; the high-pressure cylinder of the steam turbine is connected with the medium-low pressure cylinder of the steam turbine through a coupling; the medium-low pressure cylinder of the steam turbine is connected with the medium-pressure deaerator and the low-pressure heater; the solar heat exchange system comprises a solar superheater, a solar reheater and a solar preheater; the solar energy superheater, the solar energy reheater and the solar energy preheater are connected in sequence; the waste incineration waste heat boiler system comprises an economizer, a steam pocket, a water-cooled wall, an evaporator and a waste heat boiler superheater; the inlet of the waste heat boiler superheater is connected with the steam drum; the steam drum, the water-cooled wall and the evaporator are sequentially connected, and the evaporator is connected with the steam drum; the method is characterized in that: the turbonator unit system also comprises a large-lift water feed pump and a small-lift water feed pump; the large-lift water feed pump and the small-lift water feed pump are connected in parallel to form a water feed pump set; the inlet of the large-lift feed water pump is provided with a large-lift feed water pump inlet valve, and the outlet of the large-lift feed water pump is provided with a large-lift feed water pump outlet valve; the inlet of the small-lift feed water pump is provided with a small-lift feed water pump inlet valve, and the outlet of the small-lift feed water pump inlet valve is provided with a small-lift feed water pump outlet valve; the solar superheater, the steam turbine high-pressure cylinder and the solar reheater are sequentially connected; the inlet of the solar superheater is provided with a superheater inlet valve; a reheater outlet valve is arranged at an outlet of the solar reheater; a medium-temperature and medium-pressure steam bypass pipeline is arranged between the inlet of the solar superheater and the outlet of the solar reheater, and a steam bypass valve is arranged on the medium-temperature and medium-pressure steam bypass pipeline; the outlet of the waste heat boiler superheater is connected with the intermediate-temperature and intermediate-pressure steam bypass pipeline and the inlet of the solar superheater; the outlet of the solar reheater and the medium-temperature medium-pressure steam bypass pipeline are connected with the medium-low pressure cylinder of the steam turbine; the inlet of the solar preheater is provided with a preheater inlet valve, and the outlet of the solar preheater is provided with a preheater outlet valve; a water bypass pipeline is arranged between the inlet and the outlet of the solar preheater, and a water bypass valve is arranged on the water bypass pipeline; the low-pressure heater, the medium-pressure deaerator, the water feed pump unit and the economizer are sequentially connected; the economizer is connected with the inlet of the solar preheater and a water bypass pipeline; the outlet of the solar preheater and the water bypass pipeline are both connected with the steam drum.
The steam turbine power generation unit system further comprises a condenser and a condensate pump, wherein the steam turbine medium-low pressure cylinder, the condenser, the condensate pump and the low-pressure heater are sequentially connected.
The invention also comprises a generator which is connected with the low pressure cylinder in the steam turbine.
The waste incineration waste heat boiler system also comprises a down pipe and a lower header, wherein the steam drum, the down pipe, the lower header and the water-cooled wall are sequentially connected.
An operation method of a combined power generation system based on waste incineration waste heat and photo-thermal is characterized in that: the process is as follows:
when meteorological conditions meet the photo-thermal power generation, closing an inlet valve of a small-lift water feed pump and an outlet valve of the small-lift water feed pump, opening an inlet valve of a large-lift water feed pump and an outlet valve of the large-lift water feed pump, closing a water bypass valve and a steam bypass valve, simultaneously opening an inlet valve of a preheater, an outlet valve of the preheater, an inlet valve of a superheater and an outlet valve of a reheater, deoxidizing working medium water through a medium-pressure deaerator, pressurizing the working medium water through the large-lift water feed pump, sequentially passing through an economizer, a solar preheater, a steam pocket, a water wall, an evaporator and a waste heat boiler superheater to form medium-temperature superheated steam, further heating the medium-temperature superheated steam by the solar superheater to form high-temperature superheated steam, applying work to a high-temperature superheated steam after being pumped to the solar reheater through a high-pressure cylinder of a steam turbine, reheating to form the medium-temperature superheated steam, and then entering a low-pressure cylinder of the steam turbine to apply work;
when meteorological conditions can not meet the requirements of photo-thermal power generation, a large-lift water feed pump inlet valve and a large-lift water feed pump outlet valve are closed, a small-lift water feed pump inlet valve and a small-lift water feed pump outlet valve are opened, a water bypass valve and a steam bypass valve are opened, a preheater inlet valve, a preheater outlet valve, a superheater inlet valve and a reheater outlet valve are closed simultaneously, a coupler between a high-pressure cylinder and a medium-low pressure cylinder of the steam turbine is disconnected to cut off the high-pressure cylinder of the steam turbine, working medium water is deaerated by a medium-pressure deaerator, is pressurized by the small-lift water feed pump and then sequentially passes through an economizer, a steam pocket, a water-cooling wall, an evaporator and a waste heat boiler superheater to form medium-temperature superheated steam, and then directly enters the medium-low pressure cylinder of the steam turbine to do work.
Under the rated working condition, the inlet water temperature value of the economizer is 130 ℃, the inlet water temperature value of the solar preheater is 230-260 ℃, the temperature of the medium-temperature superheated steam at the outlet of the waste heat boiler superheater is 400-450 ℃, and the temperature of the high-temperature superheated steam at the outlet of the solar superheater is more than or equal to 540 ℃.
Under rated working conditions, the temperature value of the hot molten salt inlet of the solar superheater ranges from 565 ℃ to 580 ℃, and the temperature value of the cold molten salt outlet of the solar preheater is more than or equal to 260 ℃.
Compared with the prior art, the invention has the following advantages and effects:
1) the solar superheater further raises medium-temperature steam generated by the waste incineration waste heat boiler to high-temperature superheated steam by fully utilizing photo-thermal resources of part of regions, so that the heat efficiency of a waste incineration power plant is improved; the combustible substance of the household garbage is very complex in composition and contains a large amount of elements such as chlorine, sulfur and the like, so that the garbage generates more corrosive gas after being incinerated at high temperature, wherein most of the corrosive gas is also generated as chloride; the steam is heated to a higher temperature again through the solar reheater, so that the circulation efficiency can be further improved, and in addition, the exhaust steam humidity can be obviously reduced;
2) the solar energy is independently used for generating electricity, the thermoelectric conversion efficiency is low, the solar energy and the waste heat generated by burning the garbage are combined to form a combined cycle power generation system, and the power generation thermal efficiency is improved.
3) The setting of big lift feed water pump and little lift feed water pump ensures that exhaust-heat boiler over heater export steam parameter keeps unanimous basically when hot reheat steam parameter and independent msw incineration, cuts the steam turbine high pressure cylinder through the shaft coupling, when meteorological condition can not satisfy light and heat power generation, waste incineration exhaust-heat boiler can combine the independent operation with the steam turbine low pressure cylinder, has guaranteed the flexibility and the reliability of power plant operation, has enlarged light and heat power generation's suitable region to a certain extent from.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1, the embodiment of the invention comprises a waste incineration waste heat boiler system, a solar heat exchange system and a steam turbine generator unit system.
The steam turbine generator unit system comprises a steam turbine high-pressure cylinder 1, a coupler 2, a steam turbine medium-low pressure cylinder 3, a generator 4, a condenser 5, a condensate pump 6, a low-pressure heater 7, a medium-pressure deaerator 8, a large-lift water feed pump 9 and a small-lift water feed pump 10.
The waste incineration waste heat boiler system comprises an economizer 11, a steam pocket 13, a downcomer 14, a lower header 15, a water wall 16, an evaporator 17 and a waste heat boiler superheater 18.
The solar heat exchange system comprises a solar superheater 19, a solar reheater 20 and a solar preheater 12.
The low-pressure cylinder 3, the condenser 5, the condensate pump 6 and the low-pressure heater 7 of the steam turbine are connected in sequence.
The generator 4 is connected with the low pressure cylinder 3 in the steam turbine.
The high-pressure turbine cylinder 1 and the low-pressure turbine cylinder 3 are connected through a coupling 2.
The high-pressure cylinder 1 of the steam turbine is not provided with a steam extraction port. The steam turbine middle and low pressure cylinder 3 is provided with a three-level non-adjustable steam extraction port; the first-stage non-adjustable steam extraction port is connected with a first-stage air preheater of the waste heat boiler, and the first-stage steam extraction is supplied to the first-stage air preheater of the waste heat boiler to heat air; the second-stage non-adjustment steam extraction port is connected with the medium-pressure deaerator 8, and the second-stage steam extraction is supplied to the medium-pressure deaerator 8 for deaerating and heating the supplied water; and a third-stage non-adjustment steam extraction port is connected with the low-pressure heater 7, and the third-stage steam extraction is supplied to the low-pressure heater 7 to heat the condensed water.
The large-lift water feed pump 9 and the small-lift water feed pump 10 are connected in parallel to form a water feed pump set, the lift and the flow of the large-lift water feed pump 9 are matched with high-pressure high-temperature steam parameters and related working conditions, and the lift and the flow of the small-lift water feed pump 10 are matched with medium-temperature medium-pressure steam parameters and related working conditions. The inlet of the large-lift water feed pump 9 is provided with a large-lift water feed pump inlet valve S1, and the outlet is provided with a large-lift water feed pump outlet valve S2. The inlet of the small-lift water feed pump 10 is provided with a small-lift water feed pump inlet valve S3, and the outlet is provided with a small-lift water feed pump outlet valve S4.
The solar superheater 19, the solar reheater 20 and the solar preheater 12 are connected in sequence, and the hot molten salt flows through the solar superheater 19, the solar reheater 20 and the solar preheater 12 in sequence to exchange heat and is discharged as cold molten salt.
The solar superheater 19, the turbine high-pressure cylinder 1, and the solar reheater 20 are connected in sequence.
The inlet of the solar superheater 19 is provided with a superheater inlet valve S8; the outlet of the solar reheater 20 is provided with a reheater outlet valve S9; an intermediate-temperature and intermediate-pressure steam bypass pipeline is arranged between the inlet of the solar superheater 19 and the outlet of the solar reheater 20, and a steam bypass valve S10 is arranged on the intermediate-temperature and intermediate-pressure steam bypass pipeline.
The outlet of the waste heat boiler superheater 18 is connected with the inlet of the medium-temperature and medium-pressure steam bypass pipeline and the inlet of the solar superheater 19, and the inlet is connected with the steam drum 13.
The outlet of the solar reheater 20 and the medium-temperature medium-pressure steam bypass pipeline are both connected with the turbine medium-low pressure cylinder 3.
The inlet of the solar preheater 12 is provided with a preheater inlet valve S5, and the outlet is provided with a preheater outlet valve S6; a water bypass pipeline is arranged between the inlet and the outlet of the solar preheater 12, and a water bypass valve S7 is arranged on the water bypass pipeline.
The low-pressure heater 7, the medium-pressure deaerator 8, the water feed pump set and the economizer 11 are connected in sequence. The economizer 11 is connected with the inlet of the solar preheater 12 and a water bypass pipeline.
The outlet of the solar preheater 12 and the water bypass pipe are both connected to the steam drum 13.
The steam drum 13, the downcomer 14, the lower header 15, the water wall 16 and the evaporator 17 are connected in sequence, and the evaporator 17 is connected with the steam drum 13.
An operation method of a combined power generation system based on waste incineration waste heat and photo-thermal comprises the following steps:
when the meteorological conditions meet the photo-thermal power generation, the inlet valve S3 of the small-lift water feed pump and the outlet valve S4 of the small-lift water feed pump are closed, the inlet valve S1 of the large-lift water feed pump and the outlet valve S2 of the large-lift water feed pump are opened, the water bypass valve S7 and the steam bypass valve S10 are closed, simultaneously opening a preheater inlet valve S5, a preheater outlet valve S6, a superheater inlet valve S8 and a reheater outlet valve S9, deoxidizing the working medium water through a medium-pressure deaerator 8, pressurizing the working medium water through a large-lift feed water pump 9, sequentially passing through an economizer 11, a solar preheater 12, a steam drum 13, a downcomer 14, a lower header 15, a water wall 16, an evaporator 17 and a waste heat boiler superheater 18 to form medium-temperature superheated steam, further heating the medium-temperature superheated steam into high-temperature superheated steam through a solar superheater 19, the high-temperature superheated steam is extracted to a solar reheater 20 after acting through a high-pressure cylinder 1 of the steam turbine, reheated to be medium-high-temperature superheated steam, and then enters a low-pressure cylinder 3 of the steam turbine to act.
When the meteorological conditions can not meet the photo-thermal power generation, closing a large-lift water feed pump inlet valve S1 and a large-lift water feed pump outlet valve S2, opening a small-lift water feed pump inlet valve S3 and a small-lift water feed pump outlet valve S4, opening a water bypass valve S7 and a steam bypass valve S10, simultaneously closing the preheater inlet valve S5, the preheater outlet valve S6, the superheater inlet valve S8 and the reheater outlet valve S9, cutting off the solar heat exchange system, and simultaneously, a coupling 2 between the high-pressure turbine cylinder 1 and the medium-low pressure turbine cylinder 3 is disconnected to cut off the high-pressure turbine cylinder 1, working medium water is deaerated by a medium-pressure deaerator 8, is pressurized by a small-lift water feed pump 10, and then sequentially passes through an economizer 11, a steam pocket 13, a downcomer 14, a lower header 15, a water wall 16, an evaporator 17 and a waste heat boiler superheater 18 to form medium-temperature superheated steam, and then directly enters the medium-low pressure turbine cylinder 3 to do work.
Under a rated working condition, the inlet water temperature value of the economizer 11 is 130 ℃, the inlet water temperature value of the solar preheater 12 is 230-260 ℃, the temperature of the medium-temperature superheated steam at the outlet of the waste heat boiler superheater 18 is 400-450 ℃, and the temperature of the high-temperature superheated steam at the outlet of the solar superheater 19 is more than or equal to 540 ℃. The inlet temperature value of the hot molten salt of the solar superheater 19 is 565-580 ℃, and the outlet temperature value of the cold molten salt of the solar preheater 12 is more than or equal to 260 ℃.
The embodiment can be operated for a unit system, and also can be operated by a plurality of waste heat boilers, a plurality of solar heat exchange systems and a plurality of steam turbines respectively in parallel, and the high-pressure water supply pipeline, the medium-temperature medium-pressure steam pipeline, the main steam pipeline, the reheating cold section steam pipeline and the reheating hot section steam pipeline can be mother pipes.
The solar thermal power generation technology according to the present embodiment may be a solar thermal power generation technology with a heat storage system.
Example 1
When the meteorological conditions meet the photo-thermal power generation, the system is operated under 100% load rated working condition, the inlet temperature of the hot molten salt of the solar superheater 19 is 565 ℃, and the outlet temperature of the cold molten salt of the solar preheater 12 is 300 ℃. The inlet water temperature value of the economizer 11 is 130 ℃, the inlet water temperature value of the solar preheater 12 is 245 ℃, the outlet superheated steam parameter of the solar superheater 19 is 15.3MPa/540 ℃, the steam parameter of the reheating cooling section of the steam turbine is 3.82MPa/318 ℃, the steam is heated to 400-plus-heat temperature 450 ℃ by the solar reheater 20 and then enters the low-pressure cylinder 3 of the steam turbine for continuously doing work, and the steam pressure of the reheating section is the same as the steam pressure of the outlet of the superheater of the waste heat boiler.
Example 2
When meteorological conditions cannot meet the photo-thermal power generation, the solar heat exchange system and the high-pressure cylinder of the steam turbine are cut off, the waste incineration waste heat boiler operates independently, the water temperature value of the inlet of the coal economizer 11 is 130 ℃, and the superheated steam parameter of the outlet of the superheater 18 of the waste heat boiler is 3.82MPa/400-450 ℃.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an illustration of the structure of the present invention. Equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the patent. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (3)
1. The operation method of the combined power generation system based on waste incineration waste heat and photo-thermal comprises a waste incineration waste heat boiler system, a solar heat exchange system and a turbine generator set system; the steam turbine generator unit system comprises a steam turbine high-pressure cylinder, a coupling, a steam turbine medium-low pressure cylinder, a low-pressure heater and a medium-pressure deaerator; the high-pressure cylinder of the steam turbine is connected with the medium-low pressure cylinder of the steam turbine through a coupling; the medium-low pressure cylinder of the steam turbine is connected with the medium-pressure deaerator and the low-pressure heater; the solar heat exchange system comprises a solar superheater, a solar reheater and a solar preheater; the solar energy superheater, the solar energy reheater and the solar energy preheater are connected in sequence, and hot molten salt flows through the solar energy superheater, the solar energy reheater and the solar energy preheater in sequence to carry out heat exchange and becomes cold molten salt to be discharged; the waste incineration waste heat boiler system comprises an economizer, a steam pocket, a water-cooled wall, an evaporator and a waste heat boiler superheater; the inlet of the waste heat boiler superheater is connected with the steam drum; the steam drum, the water-cooled wall and the evaporator are sequentially connected, and the evaporator is connected with the steam drum; the method is characterized in that: the turbonator unit system also comprises a large-lift water feed pump and a small-lift water feed pump; the large-lift water feed pump and the small-lift water feed pump are connected in parallel to form a water feed pump set; the inlet of the large-lift feed water pump is provided with a large-lift feed water pump inlet valve, and the outlet of the large-lift feed water pump is provided with a large-lift feed water pump outlet valve; the inlet of the small-lift feed water pump is provided with a small-lift feed water pump inlet valve, and the outlet of the small-lift feed water pump inlet valve is provided with a small-lift feed water pump outlet valve; the solar superheater, the steam turbine high-pressure cylinder and the solar reheater are sequentially connected; the inlet of the solar superheater is provided with a superheater inlet valve; a reheater outlet valve is arranged at an outlet of the solar reheater; a medium-temperature and medium-pressure steam bypass pipeline is arranged between the inlet of the solar superheater and the outlet of the solar reheater, and a steam bypass valve is arranged on the medium-temperature and medium-pressure steam bypass pipeline; the outlet of the waste heat boiler superheater is connected with the intermediate-temperature and intermediate-pressure steam bypass pipeline and the inlet of the solar superheater; the outlet of the solar reheater and the medium-temperature medium-pressure steam bypass pipeline are connected with the medium-low pressure cylinder of the steam turbine; the inlet of the solar preheater is provided with a preheater inlet valve, and the outlet of the solar preheater is provided with a preheater outlet valve; a water bypass pipeline is arranged between the inlet and the outlet of the solar preheater, and a water bypass valve is arranged on the water bypass pipeline; the low-pressure heater, the medium-pressure deaerator, the water feed pump unit and the economizer are sequentially connected; the economizer is connected with the inlet of the solar preheater and a water bypass pipeline; the outlet of the solar preheater and the water bypass pipeline are both connected with the steam drum;
the operation method comprises the following processes:
when meteorological conditions meet the photo-thermal power generation, closing an inlet valve of a small-lift water feed pump and an outlet valve of the small-lift water feed pump, opening an inlet valve of a large-lift water feed pump and an outlet valve of the large-lift water feed pump, closing a water bypass valve and a steam bypass valve, simultaneously opening an inlet valve of a preheater, an outlet valve of the preheater, an inlet valve of a superheater and an outlet valve of a reheater, deoxidizing working medium water through a medium-pressure deaerator, pressurizing the working medium water through the large-lift water feed pump, sequentially passing through an economizer, a solar preheater, a steam pocket, a water wall, an evaporator and a waste heat boiler superheater to form medium-temperature superheated steam, further heating the medium-temperature superheated steam by the solar superheater to form high-temperature superheated steam, applying work to a high-temperature superheated steam after being pumped to the solar reheater through a high-pressure cylinder of a steam turbine, reheating to form the medium-temperature superheated steam, and then entering a low-pressure cylinder of the steam turbine to apply work;
when meteorological conditions can not meet the requirements of photo-thermal power generation, a large-lift water feed pump inlet valve and a large-lift water feed pump outlet valve are closed, a small-lift water feed pump inlet valve and a small-lift water feed pump outlet valve are opened, a water bypass valve and a steam bypass valve are opened, a preheater inlet valve, a preheater outlet valve, a superheater inlet valve and a reheater outlet valve are closed simultaneously, a coupler between a high-pressure cylinder and a medium-low pressure cylinder of the steam turbine is disconnected to cut off the high-pressure cylinder of the steam turbine, working medium water is deaerated by a medium-pressure deaerator, is pressurized by the small-lift water feed pump and then sequentially passes through an economizer, a steam pocket, a water-cooling wall, an evaporator and a waste heat boiler superheater to form medium-temperature superheated steam, and then directly enters the medium-low pressure cylinder of the steam turbine to do work.
2. The method for operating a waste incineration waste heat and photo-thermal based combined power generation system according to claim 1, wherein: under a rated working condition, the inlet water temperature value of the economizer is 130 ℃, the inlet water temperature value of the solar preheater is 230-260 ℃, the temperature of the medium-temperature superheated steam at the outlet of the waste heat boiler superheater is 400-450 ℃, and the temperature of the high-temperature superheated steam at the outlet of the solar superheater is not less than 540 ℃.
3. The method for operating a waste incineration waste heat and photo-thermal based combined power generation system according to claim 1, wherein: under rated working conditions, the temperature value of the hot molten salt inlet of the solar superheater is 565-580 ℃, and the temperature value of the cold molten salt outlet of the solar preheater is more than or equal to 260 ℃.
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| CN114458561A (en) * | 2021-12-28 | 2022-05-10 | 中国联合工程有限公司 | Combined power generation system based on sludge drying incineration and photothermal and its operation method |
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