CN105649694A - Gas steam back-pressure cooling four-grade utilization electricity and water cold and hot steam heating system - Google Patents

Abstract

The invention discloses a gas steam back-pressure cooling four-grade utilization electricity and water cold and hot steam heating system. The system integrates such energy equipment as a gas turbine, an afterheat boiler, a back-pressure steam turbine and such functional equipment as a back-pressure heat supply switching loop, an organic Rankine cycle set, an absorption set and a heat supply pipe network; a networked remote management integrated system is built to seasonally balance a back-pressure heat supply quantity and a heat consumption quantity of multiple sets of functional equipment; the system realizes gas and steam second-grade cyclic power generation+warm air supply+steam supply in winter; the system realizes fuel and steam organic third-grade cyclic power generation+sanitary hot water supply+steam supply in spring and autumn; and the system realizes gas and steam second-grade cyclic power generation+process cold water supply+process hot water supply+steam supply in summer.

Description

Gas steam back pressure cooling four-stage electric water cooling and heating system

(1) Technical field

The invention relates to a gas steam back pressure cooling four-stage cooling and heating system using electric water in a distributed energy system.

(2) Background technology

In a gas-steam combined cycle power plant, electrical energy is generated in two separate power generation cycles:

(1) The gas turbine generates electricity in the first stage cycle, the gas is mixed with air and combusted, and the high-pressure, high-temperature flue gas generated is sent to the gas turbine for expansion and work, which drives the impeller to rotate and drives the generator rotor to rotate to generate the first-stage power; The discharged low-pressure, high-temperature flue gas is introduced into the waste heat boiler, and the sensible heat of the flue gas is recovered to generate high-pressure, high-temperature superheated steam.

(2) The second-stage cycle of the steam turbine generates electricity. The superheated steam is sent into the steam turbine to expand and do work, which drives the impeller to rotate and drives the generator rotor to rotate to generate the second-stage power.

Therefore, the technical advantages of the gas-steam combined cycle power generation device are: (1) the power generation efficiency is increased to 60%, which is 40% higher than the highest value of any single-stage cycle power generation efficiency; therefore, it is currently the most efficient power generation device; (2) reduces carbon dioxide and sulfur dioxide , Nitrogen oxide emissions; (3) Provide reliable and flexible power support for voltage fluctuations of renewable energy power generation devices.

However, the steam turbine cycle described above generates power as follows:

(1) Power generation cycle of condensing steam turbine: only power generation without heat supply, so that a large amount of latent heat of condensation is not only not fully utilized, but also discharged into the environment through the evaporation of circulating water in the cooling tower, which not only consumes water resources but also causes environmental heat, Wet pollution; at the same time, the device is complicated, the investment is increased, the reliability is reduced, and the operating cost is increased, resulting in the system not being energy-saving and economical.

(2) Extraction condensing steam turbine thermoelectric cycle: it not only generates electricity but also supplies heat. In summer, the condensed steam heat is still discharged to the environment through the evaporation of circulating water in the cooling tower, so it not only consumes water resources but also causes environmental heat and humidity pollution; and When steam is extracted from the middle stage of the steam turbine for heating in winter, the amount of steam extracted reduces the power generation; the cycle device is complex, with increased investment, reduced reliability, increased operating costs, no energy saving, and poor economy. The only technical advantage is that it will not affect the cycle power generation of the gas turbine to avoid gas release.

(3) Back-pressure steam turbine thermoelectric cycle: both power generation and heat supply. In winter, by increasing the back pressure and making full use of a large amount of latent heat of condensation to heat the circulating hot water for heat supply, no cooling tower is needed, no water resources are consumed, and there is no ambient heat , Wet pollution; therefore, the device is simple, the investment is reduced, the operation is reliable, the energy saving is remarkable, the operation cost is low, and the economy is excellent. However, this cycle uses heat to determine electricity, so when there is no heating load in spring, summer and autumn, the steam turbine needs to stop running, which in turn affects the gas turbine power generation cycle and causes the gas to escape.

To sum up, in the gas-steam combined cycle power generation device, if the second stage adopts the back pressure steam turbine thermoelectric cycle, it can generate electricity and heat in winter, and the combined heat and power efficiency can reach 90%, so the energy saving effect is remarkable and economical. Excellent, and there is no water resource consumption and environmental heat and humidity pollution; but in spring, summer and autumn, there is no heating load, so the steam turbine stops running. Therefore, how to improve the annual utilization rate of the second-stage backpressure steam turbine thermoelectric cycle needs to be further studied and solved by thermal energy science and technology workers.

(3) Contents of the invention

The purpose of the present invention is to construct a gas steam back pressure cooling four-stage heating and cooling system using electric water: on the basis of the gas steam combined cycle power generation device, the second stage adopts a back pressure steam turbine thermoelectric cycle, and the heat released by the condenser The back pressure heat supply is divided into seasons to balance the heat consumption of multiple groups of functional equipment: drive the heating pipe network in winter to realize gas steam secondary cycle power generation + back pressure heating + steam supply; drive organic Rankine cycle units in spring and autumn to realize gas Steam organic three-stage cycle power generation + sanitary hot water supply + steam supply; in summer, the absorption unit is driven to realize gas-steam secondary cycle power generation + process cold water supply + process hot water supply + steam supply; thus maintaining the first-stage cycle power generation of the gas turbine Under certain conditions, heat energy can be utilized through four levels of gas heat, steam heat, back pressure heat, and cooling heat, and the six functions of power generation, water supply, cooling, heating, heating, and steam supply can be realized through seasonal switching to achieve comprehensive energy for the system. The utilization rate is double that of the combined cycle.

According to the gas steam back pressure cooling shown in Figure 1, the four-stage electric water cooling, heating and heating system is composed of 1-compressor; 1-1-intake filter; 1-2-intake muffler; 2-combustion chamber; 3-two-way valve; 4-gas turbine; 4-1-single shaft; 5-generator; 6-waste heat boiler; 6-1-deoxygenation steam drum; -3- economizer; 6-4- steam drum; 6-5- evaporator; 6-6- superheater; 6-7- chimney; 7- filter; 8- circulating pump; 9- check valve; 10-Steam turbine; 11-Condenser; 12-Reheater; 13-Organic Rankine cycle unit; 13-1-Evaporator; 13-2-Expander; 13-3-Regenerator; 13- 4-condenser; 13-5-liquid storage tank; 13-6-working medium pump; 13-7-organic working medium; 14-absorption unit; 14-1-regenerator; 14-2-evaporator; 14 -3-absorber; 14-4-condenser; 15-sensor data acquisition and exchange module; 16-Internet terminal computer controller; 17-expansion water tank and other components, characterized in that:

Compressor 1, combustion chamber 2, and gas turbine 4 form a gas turbine;

Compressor 1, gas turbine 4, and generator 5 are connected as a whole through a single shaft 4-1 and share a base to form the first-stage cycle power generation and compressor device of a gas turbine;

The gas pipeline is connected to the gas inlet of the combustion chamber 2 to form a gas branch;

The air pipe is connected with the intake filter 1-1, the intake muffler 1-2, the compressor 1, and the air inlet of the combustion chamber 2 to form an air branch;

The air pipeline is connected to the outlet end of the two-way valve 3 and the compressor 1 to form an air control branch;

The flue gas outlet of the combustion chamber 2 is connected to the gas turbine 4, the flue gas inlet of the waste heat boiler 6, the superheater 6-6, the evaporator 6-5, the economizer 6-3, the deoxygenation evaporator 6-2, Chimneys 6-7 form a flue gas circuit;

The bottom of the condensed water side of the condenser 11 is connected to the two-way valve 3 and the three-way through a pipeline, and the bottom of the condensed water side of the reheater 12 is connected to the two-way valve 3 and the three-way through a pipeline to connect in parallel, and then through the three-way, three-way The two-way valve 3 is connected in parallel with the desalinated water supply pipeline, and finally connected in series to the condensate inlet of the deoxygenation drum 6-1 to form a condensate circuit;

Deoxygenation steam drum 6-1 and deoxygenation evaporator 6-2 connected with its circulation pipeline, filter 7, circulation pump 8, check valve 9, economizer 6-3, steam drum 6-4 and its circulation pipeline The connected evaporator 6-5 and superheater 6-6 form the superheated steam production circuit of the waste heat boiler 6;

The bottom headers of the oxygen-removing evaporator 6-2, the economizer 6-3, and the evaporator 6-5 are respectively connected to the two-way valve 3 through pipelines, and then connected to the discharge pipe in parallel to form the sewage discharge branch of the waste heat boiler 6;

The outlets of the superheater 6-6 are connected to the three-way, three-way and two-way valves 3 through pipelines to form a branch circuit for providing superheated steam;

The superheater 6-6 outlets are connected to the three-way, three-way, two-way valve 3, and the superheated steam side of the reheater 12 through pipelines to form a reheating branch;

The outlet of superheater 6-6 is connected to the three-way, two-way valve 3, steam turbine 10, and superheated steam side of condenser 11 through pipelines to form a steam turbine branch;

The steam turbine 10 and the generator 5 form the second-stage cycle power generation device of the steam turbine;

The return pipe connects the tee, the filter 7, the circulation pump 8, the check valve 9, the hot water side of the condenser 11, the tee, the hot water side of the reheater 12, the water supply pipe network, the heating terminal and the sanitary hot water The end, the return water pipe network, the two-way valve 3, and the three-way, form a back pressure heating drive heating cycle switching circuit;

The return pipe connects the tee, the filter 7, the circulating pump 8, the check valve 9, the hot water side of the condenser 11, the tee, the tee, the hot water side of the evaporator 13-1, the two-way valve 3, and the three-way One-way and three-way, forming a back pressure heating drive power generation cycle switching circuit;

The organic working medium pipeline is connected to the working medium side of the evaporator 13-1, the two-way valve 3, the expander 13-2, the heat release side of the regenerator 13-3, the working medium side of the condenser 13-4, and the liquid storage tank 13-5 , working fluid pump 13-6, two-way valve 3, and heat-absorbing side of regenerator 13-3, forming an organic Rankine cycle loop;

The expander 13-2 and the generator 5 form the third-stage cycle power generation device of the expander;

The tap water pipeline is connected to the sanitary hot water side of the filter 7, the circulation pump 8, the check valve 9, and the condenser 13-4 to form a sanitary hot water circulation loop;

The return pipe connects the tee, the filter 7, the circulation pump 8, the check valve 9, the hot water side of the condenser 11, the tee, the tee, the hot water side of the regenerator 14-1, the two-way valve 3, the three-way One-way and three-way, forming a back pressure heat supply driven absorption unit (refrigeration + heating) combined cycle switching circuit;

The process return water pipeline is connected to the process cold water side of filter 7, circulation pump 8, check valve 9, and evaporator 14-2 to form a process cold water circulation loop;

The process water return pipeline is connected to the process hot water side of the filter 7, the circulation pump 8, the check valve 9, the absorber 14-3 and the condenser 14-4 connected in series to form a process hot water circulation loop;

The outlet at the bottom of the expansion tank 17 is connected to the tee before the inlet of the filter 7 through a pipeline to form a constant pressure expansion branch of the back pressure heating switching circuit.

In the integrated system, the gas delivery pipeline, the air delivery pipeline, the filter 7 inlets of various circulation circuits, the steam inlet of the steam turbine 10, the power lines of the generators 5 at all levels, the superheated steam output pipes, the heating heat The water output pipe, the superheated steam side inlet of the reheater 12, and the desalinated water replenishment pipe are all provided with a sensor data acquisition and exchange module 15, and communicate with the Internet terminal computer controller 16 through wired or wireless methods respectively. Communication connection, and exchange of information to form an energy management interconnection network - can be connected to the Internet.

The evaporator 13-1 is a dry evaporator or a flooded evaporator or a falling film evaporator; the condenser 13-4 is a shell-and-tube condenser or a plate condenser or a sleeve condenser or a plate-fin condenser or coil condenser.

The organic working fluid 13-7 is R134a or R245fa.

Working principle of the present invention is described as follows in conjunction with accompanying drawing 1:

1. The flue gas drives the gas turbine 4 to provide the first-stage cycle power generation and drives the compressor 1: the purified and compressed gas flows through the sensor data acquisition and exchange module 15 into the combustion chamber 2, and passes through the intake filter 1 -1 purification, intake muffler 1-2 muffler, sensor data acquisition and exchange module 15 detection, compressor 1 pressurization and the air sent into the combustion chamber 2, mixed and combusted to generate high-pressure, high-temperature flue gas, It is sent into the gas turbine 4 from the air inlet to expand and output mechanical work, which drives the impeller to rotate, and drives the rotor of the generator 5 and the impeller of the compressor 1 to rotate together through the single shaft 4-1. The module 15 is exchanged to output the first stage electric energy, and on the other hand, the air from the muffler 1-2 is compressed.

2. Waste heat boiler 6 recovers waste heat from flue gas: the low-pressure and high-temperature flue gas from the outlet of gas turbine 4 flows into waste heat boiler 6, passes through superheater 6-6, evaporator 6-5, economizer 6-3, deoxygenation and evaporation 6-2, and the flue gas sensible heat is recovered step by step; and the condensed return water in the waste heat boiler 6 is heated in steps in a countercurrent manner, and the tail gas after the reheating and cooling is discharged from the chimney 6-7 at high altitude.

3. The waste heat boiler 6 produces superheated steam: the condensed water at the bottom of the condenser 11 passes through the two-way valve 3 and three-way, and the condensed water at the bottom of the reheater 12 passes through the two-way valve 3 and three-way to mix with each other. Mix again with the desalted water supplemented by the sensor data acquisition exchange module 15, the two-way valve 3 and the three-way, then flow into the deoxygenation evaporator 6-2 connected to the deoxygenation steam drum 6-1 and its circulation pipeline, to Siphon cycle heating, separation, and oxygen removal, and then heated up to Saturated state, then flows into the evaporator 6-5 connected to the steam drum 6-4 and its circulation pipeline, and is heated by siphon circulation to generate saturated water vapor and be separated by the steam drum 6-4, and then flow through the heater 6-6 It is heated continuously to become superheated steam; the sewage is collected from the bottom headers of the deaeration evaporator 6-2, the economizer 6-3, and the evaporator 6-5, and respectively flows through the pipeline and the two-way valve 3 to be discharged. The pipe discharges into the sewer.

4. Superheated steam for heating, reheating and driving steam turbine 10 to provide second-stage cycle power generation: the superheated steam at the outlet of superheater 6-6 (1) flows through the three-way, three-way, two-way Valve 3, sensor data acquisition exchange module 15, and provide superheated steam; (2) flow through three-way, three-way, two-way valve 3, sensor data acquisition exchange module 15, the superheated steam side of reheater 12 , and condense after reheating the hot water; (3) flow through the three-way, two-way valve 3, sensor data acquisition and exchange module 15, and be sent into the steam turbine 10 by the steam inlet to expand and output mechanical work, pushing the impeller to rotate, And the rotor of the generator 5 is driven to rotate through the single shaft 4-1, so as to output the second-stage electric energy through the sensor data acquisition and exchange module 15, and at the same time, the exhaust steam at the outlet of the steam turbine 10 flows into the water vapor side of the condenser 11 to generate Heat circulates back to the water and condenses.

5. The back pressure heating switch drives the heating pipe network to provide heating and hot water circulation: the return water flows through the tee, the sensor data acquisition and exchange module 15, the filter 7, the circulation pump 8, the check valve 9, and the heat of the condenser 11 Water side, tee, hot water side of reheater 12, sensor data acquisition and exchange module 15, water supply pipe network, heating end and sanitary hot water end, return water pipe network, two-way valve 3, three-way, to switch to complete the back Pressure heating drives the heating and hot water circulation.

6. The organic Rankine cycle unit driven by the back pressure heat supply switch (third-stage cycle power generation + sanitary hot water): return water flows through the tee, sensor data acquisition and exchange module 15, filter 7, circulation pump 8, check valve 9. The hot water side of the condenser 11, three-way, three-way, sensor data acquisition and exchange module 15, the hot water side of the evaporator 13-1, two-way valve 3, three-way, three-way, to switch to complete the back pressure Heat supply drives the third-stage cycle power generation; the low-boiling organic working medium 13-7 on the working medium side of the evaporator 13-1 absorbs back pressure heat and is gasified into a pressurized gas, which then flows through the two-way valve 3 to drive the expander 13- 2 Rotate to do work to lower the pressure, and drive the rotor of the generator 5 to rotate to output the third-level electric energy through the sensor data acquisition and exchange module 15; the gas-liquid two-phase flow formed by the heat release and cooling of the regenerator 13-3, the flow When passing through the working medium side of the condenser 13-4, heat is released to the circulating sanitary hot water to condense into a liquid and flow into the liquid storage tank 13-5, and finally driven by the working medium pump 13-6 to flow through the two-way valve 3 and heat recovery After the evaporator 13-3 absorbs heat and heats up, it returns to the working fluid side of the evaporator 13-1, thereby completing the organic Rankine cycle. The tap water flows through the sensor data acquisition and exchange module 15, the filter 7, the circulation pump 8, and the check valve 9, and enters the sanitary hot water side of the condenser 13-4 to be condensed and heated by the working fluid to provide sanitary hot water.

7. Back pressure heat supply switch drives absorption unit (refrigeration + heating) combined cycle supply (process cold water + process hot water): return water flows through tee, sensor data acquisition and exchange module 15, filter 7, circulation pump 8, Check valve 9, hot water side of condenser 11, three-way, three-way, sensor data acquisition and exchange module 15, regenerator 14-1 pipe, two-way valve 3, three-way, three-way, to switch to complete the back pressure Heat supply drives the absorption unit, heats the solution outside the tube, evaporates water vapor and concentrates itself into absorption liquid, which is then driven by the absorption liquid pump, and drips outside the absorber 14-3 tube; water vapor flows through the condenser 14 Outside the -4 tube, it releases heat and condenses into refrigerant water, then depressurizes through the pipeline to cool down, and flows into the evaporator 14-2 by gravity, and then is driven by the refrigerant pump to circulate and drip on the evaporator 14-2 tube In addition, it absorbs the return water heat of the process and evaporates into water vapor, then flows through the absorber 14-3 tube, is absorbed by the dripping absorption liquid to become a dilute solution and releases the heat of dissolution, and then is driven by the solution pump to re- Send it back to the outside of the regenerator 14-1 tube, and finally evaporate water vapor through heat absorption, thereby completing the combined cycle of the absorption unit (refrigeration + heating). The process return water flows through the sensor data acquisition and exchange module 15, the filter 7, the circulation pump 8, and the check valve 9 and enters the evaporator 14-2 tube, where it is evaporated and absorbed by the refrigerant water dripping outside the tube to cool itself down, thereby Complete process cold water cycle. The process return water flows through the sensor data acquisition and exchange module 15, the filter 7, the circulation pump 8, and the check valve 9, and enters the process hot water side of the absorber 14-3 and the condenser 14-4 connected in series to be The heat of dissolution released during the absorption process of the external solution and the condensation of water vapor are exothermic and heated successively to provide process hot water.

Therefore compared with the existing gas-steam combined cycle power plant, the present invention has the following features:

1. Combined production of six functions of power generation, water supply, cooling, heating, heating, and steam supply: through system integration of gas turbine, waste heat boiler, back pressure steam turbine, organic Rankine cycle unit, absorption unit, heating pipe network Equipped with energy equipment and functional equipment, it realizes the combined production of six functions including power generation, sanitary hot water supply, process cold water supply, process hot water supply, heating hot water supply, and superheated steam supply.

2. Four-stage heat energy cascade utilization: the first stage uses 1000°C high-temperature flue gas heat energy to drive the gas turbine, the second stage uses 500°C medium-temperature steam heat energy to drive the steam turbine, and the third stage uses 100°C low-temperature back pressure heat energy to drive the organic Rankine cycle unit Or absorption unit, the fourth stage uses the cooling heat energy at room temperature of 50 ℃ to heat sanitary hot water or process hot water.

3. Gas-steam organic three-stage cycle power generation: Through the system integration of energy equipment and functional equipment such as gas turbines, waste heat boilers, back-pressure steam turbines, and organic Rankine cycle units, the gas-fired steam organic three-stage cycle power generation is realized.

4. Multi-functional equipment: the organic Rankine cycle unit realizes the dual function of providing (electricity + sanitary hot water), which increases the efficiency of the unit from 8% to 100%, which is increased by 12.5 times; the absorption unit realizes the provision (process cold water + Process hot water) double function, so that the efficiency of the unit is increased from 0.8 to 2.6, which is increased by 3.25 times; thus, each functional device can output more functions, in order to improve the return rate of the integrated system and shorten the investment recovery period, so as to meet the requirements of contract energy management Economic requirements.

5. The back pressure heat supply is switched in different seasons to balance the heat consumption of multi-group functional equipment:

(1) Drive the organic Rankine cycle unit in spring and autumn to achieve 60% of the gas steam organic three-stage cycle power generation efficiency, which is the highest in the world. At the same time, the environmental exhaust heat is recovered to heat sanitary hot water with 25% efficiency and provide superheated water with 5% efficiency Steam, the comprehensive energy utilization rate of the system is 90%, which is the highest in the world;

(2) In winter, drive the heating pipe network to provide heating and hot water circulation with an efficiency of 30%, realize the power generation efficiency of the gas steam secondary cycle of 55%, provide superheated steam with an efficiency of 5%, and the comprehensive energy utilization rate of the system is 90%;

(3) Drive the combined cycle of absorption unit (refrigeration + heating) in summer to achieve 55% efficiency of gas-steam secondary cycle power generation, provide process cold water with 24% efficiency, provide process hot water with 54% efficiency, and provide process water with 5% efficiency With superheated steam, the comprehensive energy utilization rate of the system is 138%, which is the highest in the world, double that of the combined cycle.

6. Simultaneous energy saving and environmental protection: the organic Rankine cycle unit and absorption unit in the integrated system recover all the heat exhausted by the cooling tower environment to provide sanitary hot water and process hot water, reduce system drive energy consumption and system investment, and save water Resource consumption, environmental heat and humidity pollution, energy saving and environmental protection are achieved simultaneously, and the economy is excellent; to provide distributed energy users with more functions, higher efficiency, and higher quality networked clean energy services.

7. Establish energy networking: gas delivery pipelines, air delivery pipelines, filter 7 inlets of various circulation loops, steam inlets of steam turbines 10, power lines of generators 5 at all levels, superheated water in the integrated system The steam output pipe, the heating hot water output pipe, the superheated steam side inlet of the reheater 12, and the desalinated water replenishment pipe are all equipped with a sensor data acquisition and exchange module 15, and are respectively wired or wirelessly connected to the Internet terminal computer The controllers 16 communicate with each other and exchange information, so as to form an energy management interconnection network—can be connected to the Internet.

8. Energy network remote management integrated system: realize gas, steam, organic three-level cycle power generation, four-level heat energy cascade utilization of gas heat, steam heat, back pressure heat, and cooling heat, power generation, water supply, cooling, heating, heating, Six functions of steam supply are co-produced.

9. Realize industrial power generation 4.0: "Internet + three-level cycle power generation, four-level thermal energy cascade utilization, and six functional joint production" is industrial power generation 4.0, which will promote China's industrial power generation and transform to China's creation, which is the era of the entire China revolution. Its characteristics are as follows:

(1) Interconnection: through the Internet + (sensors, integrated systems, distributed energy requirements);

(2) Data: Big data such as sensors, integrated systems, R&D and manufacturing, industrial chain, operation management, and distributed energy demand can be connected through the Internet;

(3) Integration: build sensors, embedded terminals, intelligent control, communication facilities, etc. into an intelligent network, and then form a human-human, human-machine, machine-machine, and service-service energy network to achieve horizontal and vertical Highly integrated with the terminal;

(4) Innovation: three-level cycle power generation innovation, four-level heat cascade utilization innovation, six-function joint production innovation, system integration innovation, energy networking management innovation, business model innovation, and industrial form innovation;

(5) Transformation: From the existing gas-steam combined cycle power generation and distributed energy system of electric heating and cooling to a distributed energy system with gas-steam organic three-stage cycle power generation, four-stage thermal energy cascade utilization, and six-function cogeneration The system realizes multi-level cycle power generation and thermal energy utilization, diversification of functional output, and high efficiency of comprehensive energy utilization.

10. The integrated system maintains the intake air volume of the back pressure steam turbine and the power generation of the second stage cycle throughout the year to maintain the intake air volume of the gas turbine and the power generation of the first stage cycle to avoid gas emission.

Therefore, compared with the distributed energy system of gas-steam combined cycle power generation, the technical advantages of the present invention are as follows: the system integrates gas turbines, waste heat boilers, back-pressure steam turbines and other energy equipment, and back-pressure heat supply switching circuits, organic Rankine cycle units , absorption unit, heating pipe network and other functional equipment; set up an integrated remote management system that can be connected to the Internet, and balance the back pressure heat supply and heat consumption of multiple functional equipment in seasons: realize gas steam secondary cycle power generation + back pressure heating in winter + The cogeneration efficiency of electricity, heating and steam for steam supply is 90%, and the organic three-stage cycle power generation of gas steam is realized in spring and autumn + the supply of sanitary hot water + the cogeneration efficiency of electricity, water and steam for steam supply is 90%, and the secondary cycle power generation + absorption of gas steam is realized in summer The efficiency of cogeneration of electric cooling, heating and steam provided by the formula (process cold water + process hot water) + steam supply is 138%, which is double that of the combined cycle.

(4) Description of drawings

Accompanying drawing 1 is the system flowchart of the present invention.

As shown in accompanying drawing 1, wherein: 1-compressor; 1-1-intake filter; 1-2-intake muffler; 2-combustion chamber; 3-two-way valve; 1-single shaft; 5-generator; 6-waste heat boiler; 6-1-deoxygenation steam drum; 6-2-deoxygenation evaporator; 6-3-economizer; 6-4-steam drum; 6- 5-evaporator; 6-6-superheater; 6-7-chimney; 7-filter; 8-circulation pump; 9-check valve; 10-steam turbine; 11-condenser; 12-reheat 13-organic Rankine cycle unit; 13-1-evaporator; 13-2-expander; 13-3-regenerator; 13-4-condenser; 13-5-liquid storage tank; 13-6 - Working fluid pump; 13-7- Organic working fluid; 14- Absorption unit; 14-1- Regenerator; 14-2- Evaporator; 14-3- Absorber; 14-4- Condenser; 15- Sensor Data acquisition and exchange module; 16-Internet terminal computer controller; 17-Expansion water tank.

(5) Specific implementation methods

The embodiment of the gas steam back pressure cooling four-stage utilization electric water cooling and heating heating system proposed by the present invention is shown in Figure 1, and the description is as follows: it consists of a compressor 1 (with a pressure ratio of 16.8:1), a stainless steel with a volume of 160L ) combustor 2, a gas turbine 4 with a generating capacity of 15MW to form a gas turbine;

Compressor 1, gas turbine 4, (rated power 15MW, rated voltage 10.5kV, rated current 1031A, rated frequency 50Hz, rated speed 1500r/min, power factor 0.8 synchronous) generator 5, through (stainless steel with a diameter of 75mm) The single-shaft 4-1 connection is integral and shares the base to form the first-stage cycle power generation and compressor device of the gas turbine (with a thermal efficiency of 34.8%);

(Stainless steel with a diameter of 400mm and a wall thickness of 4mm) the gas pipeline is connected to the gas inlet of the combustion chamber 2, consisting of (coke oven gas flow rate 7989Nm3/h, calorific value 16.72MJ/Nm3, temperature 50°C, pressure 2.6MPa, filtration accuracy 40μm) gas branch;

(Stainless steel with a diameter of 400mm and a wall thickness of 4mm) The air pipe is connected to the air inlet of the intake filter 1-1, the intake muffler 1-2, the compressor 1, and the combustion chamber 2, and the composition (flow 150000Nm3/h, temperature 20°C, Pressure loss 100mmH2O, filtration efficiency 99.9%) air branch;

(Stainless steel with a diameter of 60mm and a wall thickness of 2mm) The air pipe is connected to the outlet end of the two-way valve 3 and the compressor 1 to form a branch circuit of the air control pneumatic shut-off valve;

The flue gas outlet of the combustion chamber 2 is connected to the gas turbine 4 through a pipe (stainless steel with a diameter of 600mm and a wall thickness of 6mm), (self-deoxygenation, natural circulation, parameter 3.82MPa/450℃, steam production 16.8t/h, horizontal Structural) waste heat boiler 6 (flow 39.4kg/s, temperature 555 ℃) flue gas inlet, (heat exchange area 120m2) superheater 6-6, (heat exchange area 220m2) evaporator 6-5, ( The temperature of the flue gas at the outlet of the chimney 6-7 is 126°C for the economizer 6-3 with a heat exchange area of 140m2, the oxygen removal evaporator 6-2 for a heat exchange area of 120m2, and the stainless steel with a diameter of 800mm and a wall thickness of 8mm. Form the flue gas circuit;

(Heat exchange area 280m2, circulating hot water flow rate 800t/h, circulating hot water design pressure 0.3MPa, circulating hot water water resistance 5mH2O, rated back pressure 0.15MPa) the condensed water side bottom of condenser 11 passes through (diameter 40mm , stainless steel with a wall thickness of 2mm) pipes are connected to the two-way valve 3 and the three-way, and the bottom of the condensed water side of the reheater 12 is connected to the two-way valve 3 and the three-way in parallel through a pipe (stainless steel with a diameter of 40 mm and a wall thickness of 2 mm) connected, and then connected in parallel with the desalinated water supply pipeline (stainless steel with a flow rate of 10t/h, a diameter of 40mm, and a wall thickness of 2mm) through the three-way and two-way valve 3, and finally connected in series to the condensate inlet of the deoxygenation drum 6-1, Form the condensate circuit;

(200L deoxygenation steam drum 6-1) and its (20mm diameter, 2mm wall thickness stainless steel) deoxygenation evaporator 6-2 connected by circulation pipeline, (interface diameter 200mm, 2mm wall thickness stainless steel) filter 7 , (flow 16.8t/h, head 150mH2O) circulation pump 8, (stainless steel with interface diameter 200mm, wall thickness 2mm) check valve 9, economizer 6-3, steam drum 6-4 and its (diameter 20mm, The evaporator 6-5 and the superheater 6-6 connected by the circulation pipeline connected by stainless steel with a wall thickness of 2 mm form the superheated steam production circuit of the waste heat boiler 6;

The bottom headers of deaeration evaporator 6-2, economizer 6-3, and evaporator 6-5 are respectively connected to two-way valve 3 through pipes (stainless steel with a diameter of 20 mm and a wall thickness of 2 mm), and then connected in parallel to (diameter 40mm, wall thickness 3mm stainless steel) discharge pipe to form waste heat boiler 6 (with a flow rate of 0.7t/h and a temperature of 250°C) sewage branch;

The outlet of superheater 6-6 is connected to three-way, three-way and two-way valve 3 through a pipe (stainless steel with a diameter of 200mm and a wall thickness of 2mm), forming a branch circuit for supplying (6.1t/h) superheated steam;

The superheater 6-6 outlet is connected to the superheated steam side of the three-way, three-way, two-way valve 3, and (with a heat exchange area of 15m2) reheater 12 through pipelines to form a reheating branch;

The outlet of superheater 6-6 is connected to three-way and two-way valve 3 through pipelines (rated steam inlet flow rate is 16.8t/h, rated steam inlet pressure is 3.43MPa, rated back pressure is 0.15MPa, rated steam inlet temperature is 435℃, given The power is 3.00MW, the rated speed is 5600r/min, and the direction of rotation is clockwise when viewed along the steam flow direction) steam turbine 10 and the superheated steam side of condenser 11 form a back pressure steam turbine branch;

Steam turbine 10, (rated power 3.00MW, rated voltage 10.5kV, rated frequency 50Hz, rated speed 5600r/min, power factor 0.8 synchronous) generator 5, forming the second-stage cycle power generation device of the steam turbine;

(Carbon steel with a diameter of 200mm and a wall thickness of 2mm) return pipe connection tee, filter 7, (flow 800t/h, head 50mH2O) circulation pump 8, check valve 9, hot water side of condenser 11, three The hot water side of the pass and reheater 12, the water supply pipe network, the heating end and the sanitary hot water end, the return water pipe network, the two-way valve 3, and the three-way form a back pressure heating driving heating cycle switching circuit;

The return pipe connects the tee, the filter 7, the circulating pump 8, the check valve 9, the hot water side of the condenser 11, the tee, the tee, and (dry plate type with a heat exchange area of 100m2) the evaporator 13-1 The hot water side, the two-way valve 3, the three-way, and the three-way form a back pressure heating drive power generation cycle switching circuit;

(Purple copper with a diameter of 100mm and a wall thickness of 1mm) The organic working medium pipeline is connected to the working medium side of the evaporator 13-1, the two-way valve 3, (rated working medium flow rate 6.0t/h, rated inlet pressure 1.8MPa, rated inlet temperature 90°C , a given power of 1.0MW, a rated speed of 5600r/min, and a semi-hermetic turbine with a clockwise rotation direction viewed from the flow direction of the working medium) expander 13-2, (heat exchange area 32m2, interface diameter 50mm) heat recovery Heat release side of device 13-3, (shell-and-tube type with heat exchange area of 120m2) condenser 13-4 working medium side, (stainless steel with a volume of 80L, interface diameter of 50mm) liquid storage tank 13-5, (rated working medium flow rate 6.0t/h, rated head 150mH2O) working medium pump 13-6, (connection diameter 50mm) two-way valve 3, regenerator 13-3 heat absorption side, forming an organic Rankine cycle loop;

Expander 13-2, (rated power 0.82MW, rated voltage 380V, rated frequency 50Hz, rated speed 5600r/min, power factor 0.8 asynchronous) generator 5, forming the third-stage cycle power generation device of the expander;

(Temperature 20°C) tap water (carbon steel with diameter 250mm, wall thickness 2mm) pipeline connection filter 7, (rated cooling water flow rate 400t/h, rated head 15mH2O) circulation pump 8, check valve 9, condenser 13 The sanitary hot water side of -4 forms a sanitary hot water circulation loop (with a heating capacity of 9MW);

The return pipe connects the tee, the filter 7, the circulation pump 8, the check valve 9, the hot water side of the condenser 11, the tee, the tee, and the hot water side of the regenerator 14-1 (with a heat exchange area of 100m2) , two-way valve 3, three-way, and three-way to form a combined cycle switching circuit of back pressure heat supply driven absorption unit (refrigeration + heating);

(Carbon steel with a temperature of 35°C, a diameter of 100mm, and a wall thickness of 2mm) the process return water pipe is connected to a filter 7, (of a flow rate of 400t/h, and a head of 35mH2O) a circulation pump 8, a check valve 9, (of a heat exchange area of 100m2) The process cold water side of the evaporator 14-2 forms a process cold water circulation loop;

(Carbon steel with a temperature of 35°C, a diameter of 100mm, and a wall thickness of 2mm) the process return water pipe is connected to a filter 7, (with a flow rate of 400t/h, and a head of 35mH2O) a circulating pump 8, a check valve 9, and a series connection (heat exchange area The process hot water side of the absorber 14-3 of 100m2 and the condenser 14-4 (with a heat exchange area of 100m2) forms a process hot water circulation loop;

In the integrated system, the gas delivery pipeline, the air delivery pipeline, the filter 7 inlets of various circulation circuits, the steam inlet of the steam turbine 10, the power lines of the generators 5 at all levels, the superheated steam output pipes, the heating heat The water output pipe, the superheated steam side inlet of the reheater 12, and the desalinated water replenishment pipe are all provided with (flow, temperature, pressure, current, voltage, frequency) sensor data acquisition and exchange modules 15, and are respectively wired or In a wireless way, it communicates with the Internet terminal computer controller 16 and exchanges information to form an energy management interconnection network-can be connected to the Internet;

(Stainless steel with a volume of 150m3 and a wall thickness of 6mm) the outlet at the bottom of the expansion tank 17 is connected to the tee before the inlet of the filter 7 through a pipe (stainless steel with a diameter of 25mm and a wall thickness of 2mm) to form a constant pressure expansion branch of the back pressure heat supply switching circuit. road.

The organic working fluid 13-7 is R245fa.

In the embodiment of the present invention, through circuit switching, the back pressure heat supply of the steam turbine is 10MW, and the heat consumption of the functional equipment of (power generation + sanitary hot water supply), (process cold water supply + process hot water supply), heating gas supply and steam supply is balanced in seasons :

(1) Drive the heating pipe network in winter, provide heating and hot water circulation, realize the power generation of gas steam secondary cycle 18MW + back pressure heating 10MW, provide steam 2MW, and the cogeneration efficiency of electricity, heating and steam is 90%;

(2) Drive the organic Rankine cycle unit in spring and autumn, provide 0.82MW of third-stage cycle power generation, realize 18.82MW of gas steam organic third-stage cycle power generation, provide 9.18MW of 43℃ sanitary hot water, and provide 2MW of steam. Productivity 90%;

(3) Drive the absorption unit in summer to provide (20°C process cold water cooling capacity 5.27MW+55°C process hot water heat 12.20MW), realize gas-steam secondary cycle power generation of 18MW, provide steam 2MW, and cogeneration of electricity, cooling, heating and steam The efficiency is 138%.

Therefore, the integrated system maintains the intake steam volume of the back pressure steam turbine and the power generation capacity of the second-stage cycle throughout the year to maintain the intake volume of the gas turbine and the power generation capacity of the first-stage cycle; avoid gas emission; increased to 138%.

Claims (4)

1. combustion and steam back pressure cooling level Four utilizes the warm vapour system of electricity water-cooled, and it is by compressor (1); Air intake filter (1-1); Intake muffler (1-2); Combustor (2); Two-port valve (3); Combustion gas turbine (4); Single shaft (4-1); Electromotor (5); Waste heat boiler (6); Deoxygenation drum (6-1); Deoxygenation vaporizer (6-2); Economizer (6-3); Drum (6-4); Vaporizer (6-5); Superheater (6-6); Chimney (6-7); Filter (7); Circulating pump (8); Check-valves (9); Steam turbine (10); Condenser (11); Reheater (12); Organic Rankine bottoming cycle unit (13); Vaporizer (13-1); Decompressor (13-2); Regenerator (13-3); Condenser (13-4); Fluid reservoir (13-5); Working medium pump (13-6); Organic working medium (13-7); Absorption installation (14); Regenerator (14-1); Vaporizer (14-2); Absorber (14-3); Condenser (14-4); Sensor data acquisition Switching Module (15); Internet terminal computer controller (16); Expansion tanks (17) etc. form, it is characterised in that: compressor (1), combustor (2), combustion gas turbine (4), form gas turbine; Compressor (1), combustion gas turbine (4), electromotor (5), be connected as overall and common-base, composition gas turbine first order circulating generation and compressing device by single shaft (4-1); Gas pipeline connects the fuel gas inlet of combustor (2), forms combustion gas branch road; Air line connects the air intlet of air intake filter (1-1), intake muffler (1-2), compressor (1), combustor (2), forms air passage; Air line connects the port of export of two-port valve (3), compressor (1), forms air controlling brancher; The exhanst gas outlet of combustor (2) connects combustion gas turbine (4), the gas approach of waste heat boiler (6), superheater (6-6), vaporizer (6-5), economizer (6-3), deoxygenation vaporizer (6-2), chimney (6-7) by pipeline, forms flue gas circuit; The condensation water side bottom of condenser (11) connects two-port valve (3), threeway by pipeline, with the condensation water side bottom of reheater (12) by pipeline be connected two-port valve (3), threeway and be connected in parallel with each other, supplement pipeline with demineralized water be connected in parallel again through threeway, two-port valve (3), finally it is connected to the condensation water inlet of deoxygenation drum (6-1), forms condensate circuit; Deoxygenation vaporizer (6-2), filter (7), circulating pump (8), check-valves (9), economizer (6-3), drum (6-4) and the vaporizer (6-5) of circulating line connection, the superheater (6-6) that deoxygenation drum (6-1) and circulating line thereof connect, the superheated vapour of composition waste heat boiler (6) produces loop; Deoxygenation vaporizer (6-2), economizer (6-3), vaporizer (6-5) lower headers, two-port valve (3) is connected respectively through pipeline, it is connected in parallel to discharge pipe, the blowdown branch road of composition waste heat boiler (6) again; Superheater (6-6) outlet is by pipeline connecting tee, threeway, two-port valve (3), and composition provides superheated vapour branch road; Superheater (6-6) outlet by pipeline connecting tee, threeway, two-port valve (3), reheater (12) superheated vapour side, form reheat branch; Superheater (6-6) outlet by pipeline connecting tee, two-port valve (3), steam turbine (10), condenser (11) superheated vapour side, form steam turbine branch road; Steam turbine (10), electromotor (5), composition steam turbine second level circulation electric generating apparatus; Return pipe connecting tee, filter (7), circulating pump (8), check-valves (9), the hot water side of condenser (11), threeway, the hot water side of reheater (12), water supply network, heating terminal and health hot water end, return pipe net, two-port valve (3), threeway, composition back pressure is for thermal drivers heating cyclic switching loop;Return pipe connecting tee, filter (7), circulating pump (8), check-valves (9), the hot water side of condenser (11), threeway, threeway, the hot water side of vaporizer (13-1), two-port valve (3), threeway, threeway, composition back pressure is for thermal drivers power generation cycle switching circuit; Organic working medium pipeline connects vaporizer (13-1) working medium side, two-port valve (3), decompressor (13-2), regenerator (13-3) cold side, condenser (13-4) working medium side, fluid reservoir (13-5), working medium pump (13-6), two-port valve (3), regenerator (13-3) heat absorbing side, forms organic Rankine bottoming cycle loop; Decompressor (13-2), electromotor (5), form decompressor third level circulation electric generating apparatus; Water supply pipe connects the health hot water side of filter (7), circulating pump (8), check-valves (9), condenser (13-4), forms health hot water closed circuit; Return pipe connecting tee, filter (7), circulating pump (8), check-valves (9), the hot water side of condenser (11), threeway, threeway, the hot water side of regenerator (14-1), two-port valve (3), threeway, threeway, composition back pressure is for thermal drivers absorption installation (freeze+heat) combined cycle switching circuit; Technique water return pipeline connects the technique cold water side of filter (7), circulating pump (8), check-valves (9), vaporizer (14-2), and composition provides technique circulating chilled water loop; Technique water return pipeline connects the technique hot water side of filter (7), circulating pump (8), check-valves (9), the absorber (14-3) being connected in series and condenser (14-4), forms process heat water-flow circuit; Expansion tank (17) outlet at bottom is connected to the threeway before filter (7) entrance by pipeline, and the level pressure of composition back pressure heat supply switching circuit expands branch road.

2. the combustion and steam back pressure cooling level Four described in claim 1 utilizes the warm vapour system of electricity water-cooled, it is characterized in that: fuel gas transportation pipeline in an integrated system, airflow pipe, filter (7) import of various closed circuits, the air intake of steam turbine (10), the power transmission line of electromotors at different levels (5), superheated vapour outlet tube, heating hot water outlet tube, the superheated vapour side air intake of reheater 12, demineralized water supplements pipe, it is respectively provided with sensor data acquisition Switching Module (15), and respectively through wired or wireless mode, communication mutual between internet terminal computer controller (16) is connected, and exchange information, to set up into energy management internet--can network.

3. the combustion and steam back pressure cooling level Four described in claim 1 utilizes the electricity warm vapour system of water-cooled, it is characterised in that: vaporizer (13-1) is dry evaporator or flooded evaporator or downward film evaporator; Condenser (13-4) is shell-and-tube cooler or plate-type condenser or tube-in-tube condenser or plate-fin condenser or coiled tube condenser.

4. the combustion and steam back pressure cooling level Four described in claim 1 utilizes the warm vapour system of electricity water-cooled, it is characterised in that: organic working medium (13-7) is R134a or R245fa.