CN111577410B - Gas turbine inlet air temperature control device and gas turbine inlet air temperature control method - Google Patents
Gas turbine inlet air temperature control device and gas turbine inlet air temperature control method Download PDFInfo
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- CN111577410B CN111577410B CN202010551938.8A CN202010551938A CN111577410B CN 111577410 B CN111577410 B CN 111577410B CN 202010551938 A CN202010551938 A CN 202010551938A CN 111577410 B CN111577410 B CN 111577410B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/08—Heating air supply before combustion, e.g. by exhaust gases
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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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
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas-turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
- F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G7/00—Steam superheaters characterised by location, arrangement, or disposition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D1/00—Steam central heating systems
- F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
- F24D3/1066—Distributors for heating liquids
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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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a gas turbine inlet air temperature control device and a gas turbine inlet air temperature control method, comprising the following steps: the system comprises a gas turbine, a waste heat boiler, a steam turbine, an air inlet temperature control device, a condenser, a cooling tower and a cold water closing system; the gas turbine is communicated with an air inlet pipeline of the waste heat boiler through an exhaust pipeline; an exhaust pipeline of the waste heat boiler is communicated with a steam turbine; the cooling tower is respectively communicated with the condenser and the cold water closing system; the cold water closing system is communicated with the secondary cooler; the air inlet temperature control device comprises an air heat exchanger, a second water pump, a valve c and a valve d; the invention adopts the high-efficiency heat exchanger technology, solves the recycling problem of low-grade heat sources, applies the low-grade heat to the air inlet heating of the air compressor, and improves the efficiency of the gas-steam combined cycle; the irreversible loss during combustion in the combustion chamber is reduced, the purpose of saving fuel consumption is achieved, and the economical efficiency of the gas power plant is further improved.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to the field of gas turbine air inlet temperature control.
Background
The gas turbine is a rotary power machine which uses continuously flowing gas as working medium and converts heat energy into mechanical work. Because air is adopted as working medium, the running condition of the gas turbine is easily affected by external air temperature, humidity and the like. On the other hand, due to the precision of gas turbine systems, the operating efficiency of gas turbines is very sensitive to the operating load. As prior studies have shown, as the atmospheric temperature increases, the relative efficiency of the gas turbine decreases, the relative output decreases, and the relative efficiency of the combined gas-steam cycle increases. In China, the gas power plant mainly bears the peak regulation function of the power grid, and in general, the power of the gas turbine is regulated by the power plant according to the requirements of power grid dispatching, so that the full-load operation of the gas turbine is difficult to ensure. The gas turbine works in a partial load region for a long time, so that the operation efficiency of the system is greatly reduced, and the energy is greatly wasted.
At present, gas turbines of power plants in China are all provided with air Inlet Guide Vanes (IGVs), and the throat area of the IGVs is reduced by adjusting the deflection angle of the IGVs, so that the mass flow of air is reduced, and the output of a gas turbine unit is reduced. This mode of adjustment has the following technical drawbacks:
(1) When the IGV is closed down, the airflow attack angles of all stages of blades behind the IGV deviate from the design value, so that the throttling loss of the flow of the gas engine inlet in the IGV is increased, and the efficiency of the gas compressor is reduced;
(2) When the load of the combustion engine is far below the rated load, the IGV regulation has not been able to meet the regulation of the load of the combustion engine, which will be regulated by lowering the turbine front temperature, which further reduces the efficiency of the combustion engine.
In view of the actual situation that the internal combustion engine in China runs under the non-rated working condition most of the time at present, the density of the inlet air is reduced by improving the inlet air temperature of the gas engine, so that the IGV angle of the gas compressor is enlarged, the air throttling loss in the IGV is reduced, and the gas engine can run under partial verification load on the premise of ensuring that the inlet air mass flow of the gas compressor is unchanged.
The combustion engine intake air heating technology mainly aims at the operation of the combustion engine under partial load and fixed load. When the gas engine runs under partial load and fixed load, the air inlet mass flow of the gas compressor is a fixed value, the air inlet density of the gas engine can be reduced by increasing the air inlet temperature of the gas engine, so that the air inlet volume flow is increased, the IGV angle of the gas compressor is forced to be increased, the throttling loss of air flow in the IGV is reduced, and the running condition of the gas compressor is improved.
Currently, there are a set of fin tube heaters disposed in the air intake system to heat the engine intake air by introducing hot water from a waste heat boiler or other heat source. The air inlet heating mode can better utilize waste heat of the unit and improve the power generation efficiency of the combined cycle, but has the defects of large engineering quantity, large air inlet flow resistance and higher investment.
Therefore, although the gas inlet heating can improve the efficiency of the gas-steam combined cycle, how to select a low-grade heat source and economically recycle the heat source to improve the overall economy of the system is the core of the construction of the gas-steam combined cycle inlet heating system.
Disclosure of Invention
The invention aims to provide the gas turbine air inlet temperature control to solve the problems in the prior art, and can reasonably utilize low-grade heat sources and economically recycle the low-grade heat sources so as to improve the overall economy of a system;
In order to achieve the above object, the present invention provides the following solutions: the invention provides an air inlet temperature control device of a gas turbine, which is characterized by comprising the gas turbine, a waste heat boiler, a steam turbine, an air inlet temperature control device, a condenser, a cooling tower and a cold water closing system;
The urban heat supply network system sequentially comprises a heat supply network heater, a water delivery cooler and a secondary cooler according to the flow direction of a pipeline;
The gas turbine is communicated with an air inlet pipeline of the waste heat boiler through an exhaust pipeline; the exhaust pipeline of the waste heat boiler is communicated with the steam turbine; the exhaust pipeline of the steam turbine exchanges heat with the condenser and is communicated with the waste heat boiler through a first water pump; the cooling tower is respectively communicated with the condenser and the cold water closing system; the cold water closing system is communicated with the secondary cooler; the air inlet temperature control device comprises a temperature control part, and the temperature control part is arranged between the cold water closing system and the gas turbine.
The temperature control part comprises an air heat exchanger, a second water pump, a valve c and a valve d, one end of a high-temperature pipeline of the air heat exchanger is communicated with an air inlet pipeline of the gas turbine, and the other end of the high-temperature pipeline of the air heat exchanger is communicated with the cold water closing system through the second water pump and the valve c; one end of the low-temperature pipeline of the air heat exchanger is communicated with the outside, and the other end of the low-temperature pipeline is communicated with the cold water closing system through a valve d.
In the prior art, the economy of the gas-steam combined cycle can be improved through an inlet air heating technology, but how to select a heat source, design scheme of an inlet air heating system and design of a heat exchanger are also of great importance. Common sources of heat in current power plants include heat extracted from a compressor or turbine. Because the heat used is a high-grade heat source with high temperature and high pressure, the method has poor economic benefit.
The electric heating is adopted to improve the air inlet temperature in a simple and effective mode, and the air inlet of the combustion engine can be heated through the resistance wire by arranging a plurality of groups of electric heaters in the air inlet system of the combustion engine. Although the electric heating mode is adopted for controlling the temperature simply, a large amount of electric energy is consumed, and the efficiency of the unit is not improved.
The waste heat of the gas turbine power plant is utilized to heat the inlet air of the gas turbine, so that the power generation heat consumption of the gas turbine unit is reduced, and the overall operation economy of the combined cycle unit is improved.
The urban heat supply network system comprises a heat supply network heater, a primary drain cooler and a secondary drain cooler; the exhaust pipeline of the steam turbine is communicated with the air inlet pipeline of the heat supply network heater; the heat supply network heater, the primary drain cooler and the secondary drain cooler are respectively communicated through pipelines in sequence; the air heat exchanger is communicated with the cold water closing system through the secondary drain cooler; and the recycling pipeline of the secondary drain cooler exchanges heat through the condenser.
The water-mediating device is also arranged; the water mediating device is also provided with a valve e and a valve f; one end of the water intermediate device is communicated with a high-temperature pipeline of the secondary cooler through a valve e; the other end is communicated with a low-temperature pipeline of the secondary cooler through a valve f.
The cold water closing system is also provided with a valve a and a valve b; one end of the cold water closing system is communicated with a high-temperature pipeline of the secondary cooler through a valve a; the other end is communicated with a low-temperature pipeline of the secondary cooler through a valve b.
Preferably, the waste heat boiler is provided with an economizer, an evaporator and a superheater; the economizer is communicated with an exhaust pipeline of the gas turbine; the evaporator is communicated with an exhaust pipeline of the waste heat boiler; the superheater is communicated with a recycling pipeline of the waste heat boiler.
A method for controlling the temperature of an intake air of a gas turbine, comprising the steps of:
The exhaust gas of the gas turbine is sent into the waste heat boiler to generate steam water vapor, and the steam water vapor is introduced into the gas turbine to do work;
Extracting 280-320 ℃ steam from the steam turbine, and feeding the steam into the heat supply network heater for supplying heat to the urban heat supply network;
The water with the temperature reduced to 68-73 ℃ enters the primary steam trap for urban pipeline heat supply;
The drain water with the temperature reduced to 53-58 ℃ enters the secondary steam trap, heat is conducted into a closed cold water system through a pipeline, and the heat is released to the outside through a cooling tower;
entering the drain water with the temperature reduced to 53-58 ℃ into the secondary steam trap, closing a valve a and a valve b, and closing a pipeline between the cold water closing system and the secondary steam trap; opening the valve c, the valve d, the valve e and the valve f, heating cold air through intermediate water, entering the air heat exchanger and conveying the cold air into the gas turbine through a pipeline;
the drainage water in the steam turbine enters the condenser, and enters the waste heat boiler through the first water pump;
The exhaust gas in the steam turbine is conducted into a closed cold water system through a pipeline and released to the outside through a cooling tower.
Another gas turbine intake air temperature control method of a gas turbine intake air temperature control device includes the following steps:
The exhaust gas of the gas turbine is sent into the waste heat boiler to generate steam water vapor, and the steam water vapor is introduced into the gas turbine to do work;
Extracting 280-320 ℃ steam from the steam turbine, and feeding the steam into the heat supply network heater for supplying heat to the urban heat supply network;
The water with the temperature reduced to 68-73 ℃ enters the primary steam trap for urban pipeline heat supply;
The drain water with the temperature reduced to 53-58 ℃ enters the secondary steam trap, heat is conducted into a closed cold water system through a pipeline, and the heat is released to the outside through a cooling tower;
entering the drain water with the temperature reduced to 53-58 ℃ into the secondary steam trap, closing a valve a and a valve b, and closing a pipeline between the cold water closing system and the secondary steam trap; opening the valve c and the valve d; the steam turbine is communicated with the air heat exchanger through a valve i, the air temperature of an inlet is regulated through the opening degrees of the three valves, and the air is conveyed into the gas turbine through a pipeline;
and the condensed water after heat release of the air heat exchanger enters the condenser, and enters the waste heat boiler through the first water pump.
A gas turbine inlet air temperature control method of a gas turbine inlet air temperature control device comprises the following steps:
the exhaust gas of the gas turbine is sent into the waste heat boiler to generate steam water vapor, and the steam water vapor is introduced into the steam turbine to do work;
Heat in the cold water closing system enters the air heat exchanger through the valve c and the valve d and is conveyed into the gas turbine through a pipeline;
And (3) leading the drainage water in the steam turbine to enter the condenser, and leading the drainage water to enter the waste heat boiler through the first water pump.
The invention discloses the following technical effects: the heat below 55 ℃ is low-grade heat, and has the problems of difficult recovery and limited application outlets due to small temperature difference with low-temperature fluid; and the low-grade waste heat of the gas-steam combined cycle system is recovered, so that the gas compressor is closer to the designed working condition, the air temperature at the outlet of the gas compressor is improved, the irreversible loss during combustion in the combustion chamber is reduced, the purpose of saving fuel consumption is achieved, and the economical efficiency of the gas power plant is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a system diagram of a first embodiment of the present invention.
FIG. 2 is a system diagram of a second embodiment of the present invention
FIG. 3 is a system diagram of a third embodiment of the present invention
FIG. 4 is a system diagram of a fourth embodiment of the present invention
The system comprises a 1-gas turbine, a 2-waste heat boiler, a 3-steam turbine, a 4-urban heat supply network system, a 5-air inlet temperature control device, a 6-condenser, a 7-cooling tower, an 8-closed cold water system, a 9-intermediate water device, a 21-economizer, a 22-evaporator, a 23-superheater, a 41-heat supply network heater, a 42-primary drain cooler, a 43-secondary drain cooler, a 51-air heat exchanger, a 52-second water pump, a 53-valve c, a 54-valve d, a 55-valve i, a 61-first water pump, a 81-valve a, a 82-valve b, a 91-valve e and a 92-valve f.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
The invention provides an air inlet temperature control device of a gas turbine, which comprises the gas turbine 1, a waste heat boiler 2, a steam turbine 3, an air inlet temperature control device 5, a condenser 6, a cooling tower 7 and a cold water closing system 8;
The gas turbine 1 is communicated with an air inlet pipeline of the waste heat boiler 2 through an exhaust pipeline; an exhaust pipeline of the waste heat boiler 2 is communicated with the steam turbine 3; the reuse pipeline of the steam turbine 3 exchanges heat through the condenser 6 and is communicated with the waste heat boiler 2 through the first water pump 61; the cooling tower 7 is respectively communicated with the condenser 6 and the cold water closing system 8; the cold water closing system 8 is communicated with the secondary cooler 43; the intake temperature control device 5 includes a temperature control portion provided between the cold water shut-off system 8 and the gas turbine 1.
The temperature control part comprises an air heat exchanger 51, a second water pump 52, a valve c53 and a valve d54, one end of a high-temperature pipeline of the air heat exchanger 51 is communicated with an air inlet pipeline of the gas turbine 1, and the other end of the high-temperature pipeline is communicated with the cold water closing system 8 through the second water pump 52 and the valve c 53; one end of the low-temperature pipeline of the air heat exchanger 51 is communicated with the outside, and the other end is communicated with the cold water closing system 8 through a valve d 54.
Urban heat supply network system 4 comprises heat supply network heater 41, primary drain cooler 42 and secondary drain cooler 43; the exhaust pipeline of the steam turbine 3 is communicated with the air inlet pipeline of the heat supply network heater 41; the heat supply network heater 41, the primary drain cooler 42 and the secondary drain cooler 43 are respectively communicated through pipelines in sequence; the air heat exchanger 51 and the cold water closing system 8 are communicated through the secondary drain cooler 43; the reuse pipe of the secondary drain cooler 43 exchanges heat through the condenser 6.
A water intermediary device 9 is also arranged; the intermediate water device 9 is also provided with a valve e91 and a valve f92; one end of the intermediate water device 9 is communicated with a high-temperature pipeline of the secondary cooler 43 through a valve e 91; the other end is communicated with a low-temperature pipeline of the secondary cooler 43 through a valve f92; the heat supply network heater 41 is communicated with a city heat supply network pipeline; primary trap 42 is in communication with municipal pipe network piping.
The cold water closing system 8 is also provided with a valve a81 and a valve b82; one end of the cold water closing system 8 is communicated with a high-temperature pipeline of the secondary cooler 43 through a valve a 81; the other end is communicated with a low-temperature pipeline of the secondary cooler 43 through a valve b 82.
The waste heat boiler 2 is provided with an economizer 21, an evaporator 22 and a superheater 23; the 21 economizer is communicated with an exhaust pipeline of the gas turbine 1; the evaporator 22 is communicated with an exhaust pipeline of the waste heat boiler 2; the superheater 23 is in communication with a reuse pipe of the waste heat boiler 2.
According to fig. 1, in a first embodiment of the invention, the exhaust gas of a gas turbine 1 is fed into a waste heat boiler 2 for generating steam, which is introduced into a steam turbine 3 for work; steam of 280-320 ℃ is extracted from the steam turbine 3 and enters a heat supply network heater 41 for supplying heat to the urban heat supply network; the water with the temperature reduced to 68-73 ℃ enters a primary steam trap 42 for urban pipeline heat supply; the drain water with the temperature reduced to 53-58 ℃ enters a secondary steam trap 43, other heat is conducted into a closed cold water system 8 through a pipeline, and is released to the outside through a cooling tower 7;
Entering the drain water with the temperature reduced to 53-58 ℃ into a secondary drain trap 43, closing a valve a81 and a valve b82, and closing a pipeline between the cold water system 8 and the secondary drain trap 43; opening valve c53, valve d54, valve e91 and valve f92, heating cold air by intermediate water and entering the air heat exchanger 51 and being piped into the gas turbine 1;
The exhaust gas in the steam turbine 3 enters the condenser 6 and enters the waste heat boiler 2 through the first water pump 61 for recycling.
To prevent the loss of circulating water in the air heater 51 from decreasing, a valve e91 and a valve f92 are added to the system for controlling the flow of intermediate water. According to the temperature of the intermediate water and the flow and the temperature of the air at the inlet of the gas turbine, the air temperature at the inlet of the gas compressor can be adjusted by adjusting the opening degrees of the valve a81, the valve b82, the valve c53 and the valve d54, so that the gas-steam combined cycle operation condition can be better adapted. In this patent, the air heat exchanger can adopt high-efficient plate heat exchanger, when improving the gas turbine air inlet temperature, reduces the flow resistance of air as far as possible. The opening degree of the valve a81, the valve b82, the valve c53 and the valve d54 can be controlled by a PLC or other modes according to the inlet air temperature and flow of the combustion engine and the threshold values of the drainage temperature and the flow of the heat supply network. The temperature in the system is only a value under a certain specific working condition in the gas-steam cogeneration system, and in the implementation process of the patent, the specific temperature value is determined by the actual operation working condition.
According to fig. 2, in the second embodiment of the present invention, the condensed water cooled by the secondary steam trap 43 directly enters the air heat exchanger 51 to heat the cold air without heat transfer of intermediate water. In the operation process, the valve i55 is closed, the valve c53 and the valve d54 are opened, and the heat supply network is hydrophobic and can directly enter the air heat exchanger 51 to preheat air. According to the temperature of the intermediate water and the flow and the temperature of the cold air, the air temperature at the inlet of the compressor can be adjusted by adjusting the opening degrees of the valve i55, the valve c53 and the valve d54, so that the operation condition of the gas-steam combined cycle can be better adapted.
According to fig. 3, in a third embodiment of the invention, the heat source for heating the air may also originate from the cold water system 8, and the heat in the cold water system 8 is introduced into the air heat exchanger 51. According to the flow and the temperature of the cold air, the air temperature at the inlet of the compressor can be adjusted through the opening degrees of the valve c53 and the valve d54, so that the operation condition of the gas-steam combined cycle can be well adapted. When air heating is not required, the valve c53 and the valve d54 are closed.
According to fig. 4, in a fourth embodiment of the invention, the source of heat for heating the air may also originate from the flue gas at the tail of the waste heat boiler 2. A heat collector 24 is arranged at the tail part of the waste heat boiler 2, and heat is collected from the flue gas at 70-80 ℃ and used for heating the inlet air of the gas turbine 1. According to the flow and the temperature of the cold air, the air temperature at the inlet of the compressor can be adjusted through the opening degrees of the valve c53 and the valve d54, so that the operation condition of the gas-steam combined cycle can be well adapted. The scheme is that the heat collector is arranged in the waste heat boiler, so that the heat of the flue gas at the tail of the waste heat boiler is effectively utilized, the efficiency of the gas-steam combined cycle is further improved, and the waste heat boiler is applicable in four seasons.
In still another embodiment of the present invention, as shown in the structure of the figure, a low-temperature water pipe may be added to the air heat exchanger 51, so that the effect of changing the operation boundary by cooling can be achieved when the load of the gas turbine 1 is too high.
The invention discloses the following technical effects: the heat below 55 ℃ is low-grade heat, and has the problems of difficult recovery and limited application outlets due to small temperature difference with low-temperature fluid; and the low-grade waste heat of the gas-steam combined cycle system is recovered, so that the gas compressor is closer to the designed working condition, the air temperature at the outlet of the gas compressor is improved, the irreversible loss during combustion in the combustion chamber is reduced, the purpose of saving fuel consumption is achieved, and the economical efficiency of the gas power plant is further improved.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (1)
1. The gas turbine inlet air temperature control device is characterized by comprising a gas turbine (1), a waste heat boiler (2), a steam turbine (3), an inlet air temperature control device (5), a condenser (6), a cooling tower (7) and a cold water closing system (8);
The gas turbine (1) is communicated with an air inlet pipeline of the waste heat boiler (2) through an exhaust pipeline; an exhaust pipeline of the waste heat boiler (2) is communicated with the steam turbine (3); the recycling pipeline of the steam turbine (3) is communicated with the waste heat boiler (2) through a first water pump (61) through heat exchange of the condenser (6); the cooling tower (7) is respectively communicated with the condenser (6) and the cold water closing system (8); the air inlet temperature control device (5) comprises a temperature control part which is arranged between the cold water closing system (8) and the gas turbine (1); the temperature control part comprises an air heat exchanger (51), a second water pump (52), a valve c (53) and a valve d (54), one end of a high-temperature pipeline of the air heat exchanger (51) is communicated with an air inlet pipeline of the gas turbine (1), and the other end of the high-temperature pipeline is communicated with the cold water closing system (8) through the second water pump (52) and the valve c (53); one end of a low-temperature pipeline of the air heat exchanger (51) is communicated with the outside, and the other end of the low-temperature pipeline is communicated with the cold water closing system (8) through a valve d (54); the urban heat supply network system (4) is also arranged; the urban heat supply network system (4) comprises a heat supply network heater (41), a primary drain cooler (42) and a secondary drain cooler (43); an exhaust pipeline of the steam turbine (3) is communicated with an air inlet pipeline of the heat supply network heater (41); the heat supply network heater (41), the primary drain cooler (42) and the secondary drain cooler (43) are respectively communicated through pipelines in sequence; the air heat exchanger (51) is communicated with a cold water closing system (8) through the secondary drain cooler (43); the recycling pipeline of the secondary drain cooler (43) exchanges heat through the condenser (6); the cold water closing system (8) is also provided with a valve a (81) and a valve b (82); one end of the cold water closing system (8) is communicated with a high-temperature pipeline of the secondary drain cooler (43) through a valve a (81); the other end is communicated with a low-temperature pipeline of the secondary drain cooler (43) through a valve b (82); the water-mediating device (9) is also arranged; the water intermediary device (9) is also provided with a valve e (91) and a valve f (92); one end of the water intermediary device (9) is communicated with a high-temperature pipeline of the secondary hydrophobic cooler (43) through a valve e (91); the other end is communicated with a low-temperature pipeline of the secondary drain cooler (43) through a valve f (92); the heat supply network heater (41) is communicated with an urban heat supply network pipeline; the primary drain cooler (42) is communicated with an urban pipe network pipeline;
the gas turbine inlet air temperature control method comprises the following steps:
The exhaust gas of the gas turbine (1) is sent into the waste heat boiler (2) for generating water vapor, and the water vapor is introduced into the steam turbine (3) for doing work;
extracting 280-320 ℃ steam from the steam turbine (3) and feeding the steam into the heat supply network heater (41) for supplying heat to the urban heat supply network;
entering the drain water with the temperature reduced to 68-73 ℃ into the primary drain water cooler (42) for urban pipeline heat supply;
The drain water with the temperature reduced to 53-58 ℃ enters the secondary drain water cooler (43), heat is conducted into the closed cold water system (8) through a pipeline, and the heat is released to the outside through the cooling tower (7);
Entering the drain water with the temperature reduced to 53-58 ℃ into the secondary drain cooler (43), closing a valve a (81) and a valve b (82), and closing a pipeline between the cold water closing system (8) and the secondary drain cooler (43); opening the valve c (53), the valve d (54), the valve e (91) and the valve f (92), heating cold air entering the air heat exchanger (51) through intermediate water and conveying the cold air into the gas turbine (1) through a pipeline;
The drainage water in the steam turbine (3) enters the condenser (6) and enters the waste heat boiler (2) through the first water pump (61);
The valve e (91) and the valve f (92) are used for controlling the flow rate of the intermediate water, and the air temperature of the inlet of the compressor is regulated by regulating the opening degrees of the valve a (81), the valve b (82), the valve c (53) and the valve d (54) according to the temperature of the intermediate water and the flow rate and the temperature of the inlet air of the combustion engine.
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| CN114635797A (en) * | 2020-12-15 | 2022-06-17 | 华能北京热电有限责任公司 | Control system for inlet air temperature of gas turbine |
| CN114687866A (en) * | 2020-12-30 | 2022-07-01 | 华能北京热电有限责任公司 | Gas turbine system capable of adjusting heat value of natural gas |
| CN112856364B (en) * | 2021-01-21 | 2022-12-30 | 中国神华能源股份有限公司国华电力分公司 | Method for increasing waste heat utilization rate of gas combined cycle unit |
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| CN113739132B (en) * | 2021-09-30 | 2024-09-24 | 青岛达能环保设备股份有限公司 | Frequency modulation system of double partition wall type heat exchanger |
| CN116104649B (en) * | 2023-02-12 | 2024-10-22 | 华能北京热电有限责任公司 | Air inlet temperature regulating system |
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