CN113958413A - Gas-steam combined cycle intake fuel coupling heating system and method - Google Patents
Gas-steam combined cycle intake fuel coupling heating system and method Download PDFInfo
- Publication number
- CN113958413A CN113958413A CN202111345411.0A CN202111345411A CN113958413A CN 113958413 A CN113958413 A CN 113958413A CN 202111345411 A CN202111345411 A CN 202111345411A CN 113958413 A CN113958413 A CN 113958413A
- Authority
- CN
- China
- Prior art keywords
- hot water
- gas
- heater
- fuel
- combined cycle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
-
- 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
- F02C7/22—Fuel supply systems
- F02C7/224—Heating fuel before feeding to the burner
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a gas-steam combined cycle intake fuel coupling heating system and a method, wherein a gas-steam combined cycle waste heat recovery boiler side system comprises a heater, and the heater is arranged in front of a gas turbine filtering module and a cooling module; in a cross flow system formed by a hot water channel for recovering waste heat, an air inlet plate fin channel and a natural gas tube bank, the hot water transfers heat to air and natural gas through a partition plate and fins, and the hot water channel, three air inlet channels and a natural gas tube are arranged in a staggered mode. The intake air of the intake passage is sent into the heater by the air pump, and the natural gas is sent into the heater to absorb heat and raise temperature and then is sent to the combustion chamber. The combined cycle power generation system is beneficial to improving the combined cycle efficiency of the unit during partial load operation, thereby meeting the requirement of the unit on thermal performance optimization under different atmospheric temperatures and load conditions and improving the technical economy of the combined cycle power generation system.
Description
Technical Field
The invention belongs to the technical field of gas-steam combined cycle in the energy power industry, and particularly relates to a gas-steam combined cycle intake fuel coupling heating system and method.
Background
At present, in order to reduce the occupied space of a gas-steam combined cycle gas turbine, a gas inlet system of a gas compressor and a fuel gas inlet system are developed towards the direction of compactness and high efficiency. Generally, the efficiency of a gas turbine and the full-load output of combined cycle can be improved by cooling intake air, but under the influence of power generation cost, a natural gas source and new energy Internet access, a gas-steam combined cycle unit mostly undertakes a peak shaving task and operates at partial load, so that the heat consumption is greatly increased and the performance is reduced. In China, the gas turbine is more in province, the load rate of the gas turbine is 50% -80%, and when the load rate of the gas turbine is 50%, the heat consumption of the gas turbine is increased by about 30%.
On the one hand, practice shows that for a gas turbine combined cycle unit which runs under long-term partial load, the heat efficiency of the combined cycle unit can be effectively improved by heating intake air, and the cost can be saved by adopting hot water generated by a low-grade waste heat boiler as a heating heat source of the intake air. The shell-and-tube heater commonly used in the process has low efficiency, a non-compact structure, large heat exchange area, large occupied volume and difficult spatial arrangement; the number of the coil pipes or the flat pipes is large, and the large-size heat exchanger is inconvenient to overhaul and maintain in the actual use process; when the combined cycle unit operates under partial load, the flow of the air inlet and the fuel is reduced, the turbulence intensity of fluid heat exchange is weakened, and the problem of uneven heat exchange of a circulating surface exists. The plate-fin heater is a heat exchange device with high heat transfer efficiency, compact structure, light weight, firmness and strong adaptability, and is a new development direction.
On the other hand, in the combined gas-steam cycle, preheating natural gas can improve the quality of natural hot gas, reduce the fuel quantity and improve the efficiency of the gas turbine. At present, natural gas heaters of domestic gas-steam combined cycle units generally use an electric heating and water bath method to ensure the minimum temperature of natural gas, but the cost and the maintenance cost are increased. The hot water recovered by the flue gas of the waste heat boiler can convey heat to the side of the combustion engine, so that the cost can be saved. In order to prevent leakage explosion, hot air is not generally used as a medium to exchange heat with natural gas, and a traditional water-gas heat exchanger cannot be used, because the inner pipe circulates hot water and the outer shell conveys fuel and is not safe. If the inner pipe of the pipe-type shell-and-tube heater conveys natural gas, hot water flows through the outer shell, and the intermediate medium separation is realized while the operating pressure of the natural gas side can be met, so that the pipe-type shell-and-tube heater is a new development direction.
Disclosure of Invention
In order to overcome the technical problems, the invention provides a gas-steam combined cycle intake fuel coupling heating system and a method, which are beneficial to improving the combined cycle efficiency when a unit operates at partial load, thereby meeting the requirement of optimizing the thermal performance of the unit under different atmospheric temperatures and load conditions and improving the technical economy of a combined cycle generator set. The unit is required to provide a set of heating power scheme for heating air inlet and fuel, the plate fin-tube shell coupling heater is based on heating air inlet and fuel natural gas of the gas turbine at the same time, the air and fuel coupling heater allows three streams of fluid to exchange heat simultaneously, the design flow of coupling of two heat power sources of the combined cycle is optimized, the safety is higher, and the performance of the combined cycle can be effectively improved under a certain load.
In order to achieve the purpose, the invention adopts the technical scheme that:
a fuel coupling heating system of gas-steam combined cycle inlet air comprises a heater 12 and a gas-steam combined cycle waste heat recovery boiler side system, wherein the gas-steam combined cycle waste heat recovery boiler side system comprises a waste heat boiler 21, a flue gas-water heater 23 is installed at an outlet of a flue 22 at the tail of the waste heat boiler 21, a baffle 25 is arranged at an outlet of the flue 22 and used for adjusting the flow of waste heat flue gas participating in heat exchange of the flue gas-water heater, soft water is extracted from a water recovery pipeline 24, heat is absorbed in the flue gas-water heater 23, then the heated hot water is conveyed into a heat accumulator 26 and then conveyed to the heater 12 through a pipeline 3 by a water pump 27 and a valve 28, and the heater 12 is arranged in front of an original gas turbine filtering module 16 and a cooling module 17;
the intake air of the intake passage 1 is sent into a heater 12 by an air pump, natural gas is input into the heater 12 by a fuel inlet pipe 6, after absorbing heat and raising temperature, the natural gas is sent to a combustion chamber 19 by a fuel outlet pipe 7, the outlet pipe 7 is sleeved with an outer pipe 13 at the part connecting the heater 12 and the combustion chamber 19, and the outer pipe 13 is used for sending hot water.
The heater 12 includes hot water runner 5, hot water runner 5 is for being the U font, set up in the middle of hot water runner 5's the U font and both sides are provided with hot water-air baffle piece 9 respectively, stainless steel intake duct fin 2 has straightly been placed between hot water-air baffle piece 9, forms the plate fin unit body, and 5 tops of hot water runner of U font are provided with hot water inlet conveyer pipe 3 on one side, and the another side is provided with hot water outlet drain pipe 4, hot water runner 5 bottom is provided with fuel inlet pipe 6 and fuel outlet pipe 7, fuel inlet pipe 6 and fuel outlet pipe 7 are the U font.
The cold and hot fluid in the air inlet channel 1 and the hot water channel 5 orthogonally cross-flows in the adjacent plate fin unit bodies, and the heat is transferred to the air inlet channel fins 2 and the soft water-air partition plate 9 from the hot water channel 5.
The cold and hot fluid in the fuel inlet pipe 6, the fuel outlet pipe 7 and the hot water flow passage 5 reversely flow in the adjacent shell-and-tube flow passages, and heat is transferred from the hot water flow passage 5 to the fuel inlet pipe 6 and the fuel outlet pipe 7.
The hot water-air partition plates 9 are arranged straightly and uniformly and are brazed firmly by the side seal heads 11.
Stainless steel intake duct fin 2 brazes integratively with the outer baffle 8 of fin side, stainless steel intake duct fin 2 vertical direction is provided with inlet channel 1.
A return partition plate 10 for ensuring that the return part of the natural gas inner pipe is wrapped by the hot water is arranged between the U-shaped hot water flow channel 5 and the hot water-air partition plate 9 in the middle.
The heater 12 is closed by an aluminum box.
The heater 12 is divided into a short side and a field side, the short side is positioned at the top and the bottom of the U-shaped hot water flow channel 5, the air inlet flow of the air inlet flow channel 1 is along the short side of the heater 12, and the flow of the hot water flow channel 5 is along the long side of the heater.
The heater 12 is connected with a filtering module 16 through a riveting flaring 14, a temperature measuring point 15 is arranged on the riveting flaring, and the heater 12 can be installed on the basis of the heater 12 through the riveting flaring 14 according to the required air inlet heating temperature.
A method of operating a gas-steam combined cycle inlet fuel coupled heating system, comprising the steps of;
when the gas-steam combined cycle unit operates under partial working conditions, or the temperature of the natural gas needing pressure regulation may not meet the specified requirements, the heater 12 can preheat the inlet air and the fuel natural gas;
when the gas-steam combined cycle runs at full load, in order to ensure the output of the combustion engine, a valve 28 and a water pump 27 behind the hot water heat accumulator are closed, and the heater 12 does not work at the moment;
if the output of the gas turbine needs to be increased, the conventional compressor intake air cooling module 17 is started while the valve 28 and the water pump 27 are closed, and spray cooling or compressed natural gas cold energy of an LNG unit is used;
in summer, under the condition that the air inlet temperature and the fuel temperature are originally high, the heating of the air inlet is weakened, and at the moment, the angle of a smoke baffle 25 of a tail flue of the waste heat boiler is electrically adjusted to block partial smoke and reduce the heat conveyed by a hot water pipe 3;
under severe conditions in winter, in order to avoid freezing of the intake air 1, the flue gas baffle 25, the hot water valve 28 and the water pump 27 are completely opened, and the heat accumulator 26 is electrically heated to increase the temperature of hot water;
or adjusting the soft water return 24 to reduce the mass flow of the supplied soft water to control the magnitude of the increase in intake air and fuel temperature.
In summary, the current atmospheric temperature, the unit load and the operation target can be integrated to perform cooling or heating switching adjustment on the intake air temperature.
The invention has the beneficial effects that:
the invention is used for full load and partial working condition of the gas-steam combined cycle. In a cross flow system formed by a hot water channel for recovering waste heat, an air inlet plate fin channel and a natural gas tube bank, the hot water transfers heat to air and natural gas through a partition plate and fins, and the hot water channel is overlapped with the three air inlet channels and the natural gas tube.
The coupled heater has the following unique advantages:
the plate-fin heater has smaller heat exchange area, heat exchange volume and energy consumption than the traditional heater, higher heat transfer coefficient and heat exchange efficiency, no need of sealing elements such as gaskets and the like during manufacturing, and no internal leakage defect;
the inner pipe of the tubular pipe heater conveys natural gas, the outer shell circulates hot water, the operating pressure of the natural gas side can be met, and meanwhile, the intermediate medium separation is realized, so that the leakage explosion risk caused by natural gas heating is completely avoided;
therefore, the coupling heater system is simple, compact in structure, small in occupied space, high in heat exchange efficiency, high in safety and convenient to operate and maintain, and meets the requirement of partial load operation of combined cycle;
obviously, configuring the air and natural gas with the same heater can simplify the system configuration.
Because the inlet air and the fuel absorb the waste heat energy of the boiler exhaust smoke, the part of energy enters the combined cycle system to do work, the energy carried by the natural gas and the air is increased, and the fuel required by the unit is reduced.
The heater provided by the invention has the following advantages in a gas-steam combined cycle system:
under the working condition of combined cycle partial load, after the air inlet temperature is increased, the load rate of the combustion engine is increased, and the power generation efficiency of the combustion engine is increased.
The temperature of the fuel natural gas is increased, the combined cycle power generation efficiency can be improved, and the heat consumption of the combustion engine is reduced.
The heating of the inlet air can also prevent the problems of ice blockage, wet blockage and the like of the inlet air assembly of the gas turbine in winter.
When the gas-steam combined cycle runs at full load or the air temperature of the inlet air and the fuel is originally higher under the condition of summer, the heater provided by the invention can be closed at any time due to the hot water heat accumulator and the flue gas valve, and the conventional air compressor inlet air cooling module is not influenced.
The traditional device for heating natural gas by using house service power is saved, and the economical efficiency is good.
And during partial load, the load factor of the operation of the gas turbine is improved by utilizing the air inlet heating of the gas compressor, and the low-load limited range of stable combustion can be widened by matching with the adjustment of the air inlet rotatable guide vanes.
The system can heat the inlet air of the compressor and the fuel natural gas to 80 ℃ by utilizing the heat of the exhausted smoke to heat the soft water, wherein the smoke temperature is about 100 ℃ generally, the water temperature heated by the waste heat under the normal working condition is 90 ℃, and then the hot soft water is conveyed to a heater at the island side of the gas turbine engine.
In conclusion, the pipe shell-plate fin coupling heater system and the method for heating the intake air and the fuel natural gas by recovering the low-grade waste heat are beneficial to improving the combined cycle efficiency of the unit during partial load operation, thereby meeting the requirement of the unit on thermal performance optimization under different atmospheric temperatures and load conditions and improving the technical economy of the combined cycle generator set.
Drawings
FIG. 1 is a schematic view of an intake-fuel coupled heater of the present invention.
FIG. 2 is a schematic diagram of a system incorporating a combined cycle for a heating apparatus according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the plate fin-tube shell coupling heater 12 of the present invention is mainly composed of four rows of air inlet channels 1, hot water inlet delivery pipes 3 and hot water outlet drain pipes 4, natural gas inlet connecting pipes 6 and outlet connecting pipes 7, an outer partition plate 8, a soft water-air partition plate 9, a return partition plate 10, and a seal head 11.
The heater 12 is characterized in that:
cold and hot fluid in the air inlet flow passage 1 and the hot water flow passage 5 orthogonally cross flow in the adjacent plate fin unit bodies, and heat is transferred to the air inlet fin 2 and the soft water-air partition plate 9 from the hot water flow passage 5;
cold and hot fluids in the fuel pipes 6 and 7 and the hot water flow passage 5 reversely flow in the adjacent shell-and-tube flow passages, and heat is transferred from the hot water flow passage 5 to the natural gas connecting pipes 6 and 7;
the cold and hot alternate partition plate of the inner plate of the heater is made of stainless steel material, and the hot water-air partition plates 9 are arranged straightly and uniformly and are brazed by the side sealing heads 11;
fins are distributed on each row of air inlet channels 1, 30 stainless steel air inlet channel fins 2 are adopted and are flatly and straightly arranged between hot water-air flat partition plates 9 and are brazed with outer partition plates 8 on the side edges of the fins into a whole; the return partition plate 10 ensures that the hot water wraps the return part of the natural gas inner pipe;
the whole heater 12 is additionally provided with an aluminum box for sealing, and the heat preservation performance is good.
In the heat exchanger 12, three fluid coupling modes of air, natural gas and hot water are as follows:
the flow of the air inlet flow channel 1 of the inlet air is along the short side of the heater, and the resistance of the air inlet side of the plate fin is designed to be smaller as much as possible during design;
the flow path of the hot water flow passage 5 is U-shaped along the long edge of the heater, hot water is input from an inlet conveying pipeline 3 at the same side of the heater and is discharged from a hot water outlet drain pipe 4 by a water feeding pump, and soft water is recovered by a recovery device;
the natural gas inner connecting pipe is arranged in the hot water flow channel 5, the natural gas inner connecting pipe is input from the fuel inlet pipe 6 and output from the fuel outlet pipe 7 at the same side in a U shape, the outlet pipe 7 is sleeved with an outer pipe 13 at the part connecting the heater 12 and the combustion chamber 19, and the outer sleeve 13 is used for conveying hot water;
the inlet and outlet of the three fluids are provided with temperature and pressure measuring instruments.
As shown in fig. 2, the present invention provides a corresponding waste heat boiler waste heat recovery system based on the gas-air heater 12, which is applied to a gas-steam combined cycle.
The heater 12 is technically characterized on the boiler side of the gas-steam combined cycle gas turbine as follows:
a flue gas-water heating tube bank 23 is additionally arranged on a tail flue 22 of the waste heat boiler 21, and a hinged baffle 25 is arranged on the flue gas side of the waste heat boiler;
the flue gas baffle 25 can rotate to block part of the flue tail flue gas and adjust the flow of waste heat flue gas participating in heat exchange of the flue gas-water heating tube bank 23;
soft water is extracted from a water recovery pipeline 24, heat is absorbed in a smoke-water heat exchange pipe bank 23, then the heated hot water is conveyed into a hot water heat accumulator 26, and then is conveyed to the heater 12 of the invention through a pipeline 3 by a water pump 27 and a valve 28;
the flow of hot water involved in intake air and fuel heating can be adjusted by adjusting the opening of the valve 28, which can be closed if necessary.
The heater 12 is technically characterized on the island side of the gas turbine with the combined gas-steam cycle as follows:
the heater 12 is arranged in front of the original gas turbine filtering module 16 and the cooling module 17;
the intake air 1 is sent into a box body of a plate fin-tube shell coupling heater by an air extraction pump, and a riveting flaring 14 is required to be additionally arranged as the size of a heater 12 is larger than that of an air inlet of an original gas turbine;
arranging a temperature measuring point 15 on the riveting flaring to monitor the temperature of the intake air;
the heater 12 may be mounted on the heater 12 by riveting the flare 14, depending on the heating temperature required by the actual combined cycle plant.
The air of the heater enters the compressor 18 through the flaring 14 for compression after absorbing heat and raising temperature in the flow channel 1, and the air with higher pressure and temperature enters the combustion chamber 19;
natural gas is input into the heater through a fuel inlet pipe 6, absorbs heat and is heated, and then the natural gas is conveyed to a combustion chamber 19 through a fuel outlet pipe 7;
the air and fuel with higher pressure and temperature are mixed and combusted, and the high-temperature and high-pressure gas is discharged to enter the turbine 20 to do work.
The working principle of the invention is as follows:
when the gas turbine runs at partial load, the air inlet flow of the gas compressor is changed by adjusting the opening of the air inlet rotatable guide vane of the gas compressor, the turbine front temperature of the gas turbine is kept at a higher temperature, the running efficiency of the gas turbine is ensured, and the opening of the air inlet rotatable guide vane of the gas compressor is automatically controlled by a gas turbine unit, so the parameters and the load of the unit are influenced mutually. Therefore, the specific implementation and detailed technical scheme of the comprehensive optimization scheme should be formulated according to the actual operation parameters of the unit and the field installation space:
when the gas-steam combined cycle unit operates under partial working conditions, or the temperature of the natural gas needing pressure regulation may not meet the specified requirements, the heater 12 can preheat the inlet air and the fuel natural gas;
when the gas-steam combined cycle runs at full load, in order to ensure the output of the combustion engine, a valve 28 and a water pump 27 behind the hot water heat accumulator are closed, and the heater 12 does not work at the moment;
if the output of the gas turbine needs to be increased, the conventional compressor intake air cooling module 17 is started while the valve 28 and the water pump 27 are closed, and spray cooling or compressed natural gas cold energy of an LNG unit is used;
in summer, under the condition that the air inlet temperature and the fuel temperature are originally high, the heating of the air inlet is weakened, and at the moment, the angle of a smoke baffle 25 of a tail flue of the waste heat boiler is electrically adjusted to block partial smoke and reduce the heat conveyed by a hot water pipe 3;
under severe conditions in winter, in order to avoid freezing of the intake air 1, the flue gas baffle 25, the hot water valve 28 and the water pump 27 are completely opened, and the heat accumulator 26 is electrically heated to increase the temperature of hot water;
the soft water return 24 may also be adjusted to reduce the mass flow rate of the supplied soft water to control the magnitude of the increase in intake air and fuel temperature.
The invention applies the high-efficiency compact plate fin-tube shell coupling heater to the gas turbine air inlet-fuel heating system, and the water side of the heater is provided by the waste heat of the tail flue of the waste heat boiler. Due to the fact that the large difference of the pressure and the temperature of the gas side and the air side enables the volume flow rate difference of the gas side and the air side to be large, the design that the tubular gas flow channel and the plate type air flow channel are different in size is adopted to achieve high heat exchange efficiency. The inner pipe of the fuel natural gas shell-and-tube heater adopts a smooth flat pipe, the inside of the air inlet plate-fin heater is provided with fins, and the heat convection and the heat conduction are coupled together to strengthen the heat exchange. The current atmospheric temperature, the unit load and the operation target can be integrated to carry out cooling or heating switching adjustment on the intake temperature.
Claims (10)
1. A fuel-gas combined cycle intake fuel coupling heating system is characterized by comprising a heater (12) and a fuel-gas combined cycle waste heat recovery boiler side system, the gas-steam combined cycle waste heat recovery boiler side system comprises a waste heat boiler (21), a flue gas-water heater (23) is arranged at the outlet of a flue (22) at the tail part of the waste heat boiler (21), a baffle plate (25) is arranged at the flue gas side of the flue (22), used for adjusting the flow of waste heat flue gas participating in heat exchange, extracting soft water from a water recovery pipeline (24), absorbs heat in a smoke-water heater (23), then conveys the heated hot water into a hot water heat accumulator (26), and conveys the heated hot water to a heater (12) through a pipeline (3) by a water pump (27) and a valve (28), the heater (12) is arranged in front of the original gas turbine filtering module (16) and the cooling module (17);
the air intake of the air intake channel (1) is sent into the heater (12) by the air pump, the natural gas is input into the heater (12) by the fuel inlet pipe (6), after heat absorption and temperature rise, the natural gas is sent to the combustion chamber (19) by the fuel outlet pipe (7), the part of the outlet pipe (7) connecting the heater (12) and the combustion chamber (19) is sleeved with the outer pipe (13), and the outer pipe (13) is used for sending hot water.
2. A gas-steam combined cycle inlet fuel coupled heating system according to claim 1, it is characterized in that the heater (12) comprises a hot water flow passage (5), the hot water flow passage (5) is U-shaped, the hot water flow passage (5) is provided with a hot water-air baffle plate (9) in the middle and at two sides of the U shape, a stainless steel air inlet fin (2) is straightly placed between the hot water-air partition plates (9) to form a plate fin unit body, one side of the top of the U-shaped hot water flow channel (5) is provided with a hot water inlet conveying pipe (3), the other side is provided with a hot water outlet drain pipe (4), a fuel inlet pipe (6) and a fuel outlet pipe (7) are arranged at the bottom of the hot water flow passage (5), the fuel inlet pipe (6) and the fuel outlet pipe (7) are U-shaped.
3. A gas-steam combined cycle inlet fuel coupled heating system as claimed in claim 2, wherein the hot and cold fluid in the inlet channel (1) and hot water channel (5) cross flow orthogonally in the adjacent plate fin unit, and the heat is transferred from the hot water channel (5) to the inlet fin (2) and the soft water-air partition (9).
4. A gas-steam combined cycle intake fuel coupled heating system as claimed in claim 2, wherein the cold and hot fluid in the fuel inlet pipe (6), the fuel outlet pipe (7) and the hot water flow passage (5) flow reversely in the adjacent shell-and-tube flow passage, and the heat is transferred from the hot water flow passage (5) to the fuel inlet pipe (6) and the fuel outlet pipe (7).
5. A gas-steam combined cycle inlet fuel coupled heating system according to claim 2, characterized in that the hot water-air separator plates (9) are arranged straight and uniform and are brazed by the side heads (11).
6. The gas-steam combined cycle intake fuel coupled heating system of claim 2, wherein the stainless steel intake fin (2) is brazed with the outer partition plate (8) at the side of the fin, and the stainless steel intake fin (2) is provided with the intake channel (1) in the vertical direction.
7. A gas-steam combined cycle inlet fuel coupled heating system according to claim 2, characterized in that a return baffle (10) ensuring that the return part of the natural gas inner pipe is wrapped by the hot water is arranged between the U-shaped hot water flow channel (5) and the middle hot water-air baffle plate (9).
8. A gas-steam combined cycle inlet fuel coupled heating system according to claim 2, characterized in that the heater (12) is closed with the addition of an aluminium box;
the heater (12) is divided into a short side and a field side, the short side is positioned at the top and the bottom of the U-shaped hot water flow channel (5), the air inlet flow of the air inlet flow channel (1) is along the short side of the heater (12), and the flow of the hot water flow channel (5) is along the long side of the heater.
9. The combined gas-steam cycle intake fuel coupled heating system of claim 2, characterized in that the heater (12) is connected with the filtering module (16) through a riveted flaring (14), a temperature measuring point 15 is arranged on the riveted flaring, and the heater (12) can be installed on the basis of the heater (12) through the riveted flaring (14) according to the required intake heating temperature.
10. A method of operating a gas-steam combined cycle inlet fuel coupled heating system according to any one of claims 1 to 9, comprising the steps of;
when the gas-steam combined cycle unit runs under partial working conditions or the temperature of natural gas needing pressure regulation may not meet the specified requirement, the heater (12) can preheat inlet air and fuel natural gas;
when the gas-steam combined cycle runs at full load, in order to ensure the output of the combustion engine, a valve (28) and a water pump (27) behind the hot water heat accumulator are closed, and the heater (12) does not work;
if the output of the gas turbine needs to be improved, a valve (28) and a water pump (27) are closed, and meanwhile, a conventional compressor air inlet cooling module (17) is started, and spray cooling or compressed natural gas cold energy of an LNG unit is used;
in summer, under the condition that the air inlet temperature and the fuel temperature are originally high, the heating of the air inlet is weakened, and at the moment, the angle of a smoke baffle (25) of a tail flue of the waste heat boiler is adjusted electrically, so that partial smoke is blocked, and the heat conveyed by the hot water pipe 3 is reduced;
under severe conditions in winter, in order to avoid freezing of the intake air 1, the flue gas baffle (25), the hot water valve (28) and the water pump (27) are completely opened, and the heat accumulator (26) is electrically heated to increase the temperature of hot water;
or adjusting the soft water return (24) to reduce the mass flow of the supplied soft water to control the magnitude of the increase in the intake air and fuel temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111345411.0A CN113958413A (en) | 2021-11-15 | 2021-11-15 | Gas-steam combined cycle intake fuel coupling heating system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111345411.0A CN113958413A (en) | 2021-11-15 | 2021-11-15 | Gas-steam combined cycle intake fuel coupling heating system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113958413A true CN113958413A (en) | 2022-01-21 |
Family
ID=79470462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111345411.0A Pending CN113958413A (en) | 2021-11-15 | 2021-11-15 | Gas-steam combined cycle intake fuel coupling heating system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113958413A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543067A (en) * | 2022-02-24 | 2022-05-27 | 东莞顺裕纸业有限公司 | Coal-to-gas station with improved air flow passage and improved heat energy utilization rate |
| CN114837810A (en) * | 2022-05-25 | 2022-08-02 | 惠州深能源丰达电力有限公司 | Method and system for controlling and improving efficiency of wide-load operation of gas-steam combined cycle peak shaving unit |
| CN115288816A (en) * | 2022-08-12 | 2022-11-04 | 西安热工研究院有限公司 | Starting optimization system and method for combined-cycle multistage-recycling machine island waste heat |
-
2021
- 2021-11-15 CN CN202111345411.0A patent/CN113958413A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543067A (en) * | 2022-02-24 | 2022-05-27 | 东莞顺裕纸业有限公司 | Coal-to-gas station with improved air flow passage and improved heat energy utilization rate |
| CN114543067B (en) * | 2022-02-24 | 2024-03-22 | 东莞顺裕纸业有限公司 | Coal gas station with improved air flow passage and improved heat energy utilization rate |
| CN114837810A (en) * | 2022-05-25 | 2022-08-02 | 惠州深能源丰达电力有限公司 | Method and system for controlling and improving efficiency of wide-load operation of gas-steam combined cycle peak shaving unit |
| CN115288816A (en) * | 2022-08-12 | 2022-11-04 | 西安热工研究院有限公司 | Starting optimization system and method for combined-cycle multistage-recycling machine island waste heat |
| CN115288816B (en) * | 2022-08-12 | 2023-09-29 | 西安热工研究院有限公司 | Starting optimization system and method for combined cycle multistage recovery machine island waste heat |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113958413A (en) | Gas-steam combined cycle intake fuel coupling heating system and method | |
| CN206237147U (en) | The distributed energy of liquefied natural gas plant stand utilizes system | |
| CN105485649B (en) | A kind of efficient waste heat recycling utilization system | |
| CN103244944B (en) | Air preheating system and method performing steam extraction by utilizing steam turbine | |
| CN108224535B (en) | Complementary integrated system of cogeneration of thermal power plant and compressed air energy storage | |
| CN107905897A (en) | Gas turbine cycle flue gas waste heat recovery and inlet gas cooling association system and method | |
| CN208704000U (en) | A kind of residual heat from boiler fume recovery system based on gas-burning machine heat pump | |
| CN107676829A (en) | A kind of Waste Heat Recovery integrates side fish stove | |
| CN203249228U (en) | Air pre-heating system extracting steam through steam turbine | |
| CN108798898B (en) | System and method for supplying steam and hot water by combining proton exchange membrane fuel cell and gas turbine | |
| CN208040541U (en) | Gas turbine cycle flue gas waste heat recovery and inlet gas cooling association system | |
| CN207813676U (en) | It is a kind of to improve the solidifying back of the body of taking out for thermally safe co-generation unit | |
| CN208332225U (en) | The system energized using Proton Exchange Membrane Fuel Cells and gas turbine waste heat | |
| CN206917747U (en) | A kind of distributed energy resource system | |
| CN216691267U (en) | Fuel gas-steam combined cycle air inlet fuel coupling heating system | |
| CN108361679A (en) | The system and method energized using Proton Exchange Membrane Fuel Cells and gas turbine waste heat | |
| CN107763680A (en) | A kind of integrated large stove of used heat conversion | |
| CN102494329B (en) | Device for utilizing flue gas waste heat of boiler comprehensively | |
| CN213980964U (en) | Cold and heat quantity optimal utilization system between coal press of low-heat-value combined cycle unit | |
| CN201496994U (en) | Boiler hot water steam air heater | |
| CN208347882U (en) | A kind of SOFC fuel cell and internal combustion engine combustion gas distributed couplings system | |
| CN206554986U (en) | A kind of high back pressure steam discharge and the heating system being of coupled connections with heater of drawing gas | |
| CN209116822U (en) | A kind of residual heat of electric power plant and clean energy resource utilization system | |
| CN112796904A (en) | Cogeneration device of diesel generator | |
| CN109210969A (en) | A kind of residual heat of electric power plant and clean energy resource utilization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |