CN113864060B - Air inlet temperature adjusting system and method for LNG power station combined cycle unit - Google Patents
Air inlet temperature adjusting system and method for LNG power station combined cycle unit Download PDFInfo
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- CN113864060B CN113864060B CN202111277227.7A CN202111277227A CN113864060B CN 113864060 B CN113864060 B CN 113864060B CN 202111277227 A CN202111277227 A CN 202111277227A CN 113864060 B CN113864060 B CN 113864060B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000498 cooling water Substances 0.000 claims abstract description 45
- 238000002309 gasification Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000002918 waste heat Substances 0.000 claims abstract description 36
- 238000011084 recovery Methods 0.000 claims abstract description 34
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003546 flue gas Substances 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 239000003507 refrigerant Substances 0.000 claims description 41
- 239000007789 gas Substances 0.000 claims description 35
- 239000008236 heating water Substances 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 239000003345 natural gas Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 abstract description 9
- 238000010248 power generation Methods 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 6
- 238000011068 loading method Methods 0.000 abstract description 2
- 239000003949 liquefied natural gas Substances 0.000 description 73
- 239000000446 fuel Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Classifications
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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
-
- 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
- F02C7/12—Cooling of plants
- F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
- F02C7/141—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid
-
- 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
- F02C7/12—Cooling of plants
- F02C7/16—Cooling of plants characterised by cooling medium
-
- 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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
-
- 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
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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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)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses an air inlet temperature regulating system and an air inlet temperature regulating method for an LNG power station combined cycle unit, which mainly comprise an LNG gasification cold energy recycling link and a unit flue gas waste heat recycling link. And in the high-temperature season LNG gasification cold energy recycling link, cold energy in the LNG gasification process is recycled through the two-stage cold energy heat exchange system to prepare cooling water, so that air inlet of the unit is cooled, the air inlet temperature of the unit is reduced, the output and the heat efficiency of the unit are increased, and the peak shaving performance of the combined cycle unit is improved. In the low-temperature season link, the smoke waste heat recovery and utilization link recovers the smoke waste heat in the power generation process of the combined cycle unit through the heat energy heat exchange system to prepare hot water, so that the air inlet of the unit is heated, the air temperature entering the unit can be prevented from being lower than the dew point temperature, the water contained in the air is frozen to threaten the safe operation of the unit, and the net efficiency of the unit during loading can be improved.
Description
Technical Field
The invention belongs to the technical field of residual energy utilization of energy systems, and particularly relates to an air inlet temperature regulating system and method of an LNG power station combined cycle unit.
Background
LNG is generally liquefied natural gas, which is a liquid alkane mixture formed by cooling and liquefying natural gas through a low-temperature process after drying and purifying treatment, and is generally stored in a low-temperature storage tank at a temperature of about-162 ℃ and under a pressure of about 0.1 MPa. LNG can be used as fuel, and carries a large amount of high-grade cold energy, and the cold energy released in the gasification process is as high as about 830kJ/kg (including the latent heat of gasification and the sensible heat raised to the ambient temperature). The LNG power generation of the LNG power station needs to be gasified and warmed up firstly, and the cold energy of the LNG is usually taken away and released by external media during the period.
In addition, a large-scale F-stage gas turbine combined cycle unit is commonly arranged in an LNG power station, and the exhaust gas temperature of the rest of hot boilers is generally about 90 ℃. Because the components of the LNG do not contain sulfur, the problems of acid corrosion and the like do not need to be considered, and the smoke exhaust dew point temperature of the corresponding waste heat boiler is equal to the water dew point temperature of the smoke. Therefore, the exhaust gas temperature of the waste heat boiler can be reduced to about 60 ℃ theoretically (about 10 ℃ above dew point temperature is considered).
The output of the combined cycle unit is reduced along with the increase of the atmospheric temperature, and if the LNG gasification cold energy is reasonably utilized and used as a cold source for reducing the air inlet temperature of the unit in a high-temperature season, the output of the unit can be effectively improved, and the peak shaving performance of the unit is improved. Meanwhile, the air inlet of the unit is a pressure-reducing and speed-increasing process, the temperature of about 5 ℃ is reduced during the pressure-reducing and speed-increasing process, and if the waste heat of the flue gas of the unit is reasonably utilized and used as a heat source for increasing the air inlet temperature of the unit in low-temperature seasons, the danger of water blockage and ice blockage of the unit caused by the too low temperature can be effectively prevented; at present, the regulation of the air inlet temperature of the combined cycle unit is mainly realized by preparing a cold source while taking heat supply steam extraction or low-pressure main steam of a steam turbine as a heat source, but the extraction of a high-grade steam source as a heat medium can have adverse effects on the output and the heat efficiency of the unit.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the air inlet temperature regulating system and the air inlet temperature regulating method for the LNG power station combined cycle unit, which utilize LNG cold energy and flue gas waste heat to realize the regulation of the air inlet temperature of the combined cycle unit, have no influence on the unit power generation while not influencing the unit power generation, accord with the principle of energy cascade utilization, do not produce environmental pollution, and simultaneously improve the safety and the economical efficiency of the unit operation.
The invention is realized by the following technical scheme:
An air inlet temperature regulating system of an LNG power station combined cycle unit comprises an LNG gasification cold energy recovery device and a unit flue gas waste heat recovery device;
the LNG gasification cold energy recovery device comprises a primary cold energy heat exchanger, a refrigerant tank, a secondary cold energy heat exchanger and a cooling water tank; the cold side of the primary cold energy heat exchanger is connected with the LNG gasifying device in parallel, the hot side of the primary cold energy heat exchanger, the refrigerant tank and the cold side of the secondary cold energy heat exchanger are connected in series, the hot side of the secondary cold energy heat exchanger is connected with the cooling water tank and the air inlet cooler in series, and the air inlet cooler is arranged in an air inlet channel of the gas turbine;
the unit flue gas waste heat recovery device comprises a water storage tank, a heat energy heat exchanger and an air inlet heater which are sequentially connected in series, wherein the heat energy heat exchanger is arranged in an air inlet channel of the gas turbine, and the air inlet heater is arranged in a flue gas channel of the waste heat boiler.
Preferably, the inlet end of the LNG gasification device is connected with the LNG low-temperature storage tank through the LNG drying and purifying device, and the outlet end of the LNG gasification device is connected with the gas turbine through the gas turbine front-end module.
Preferably, an auxiliary heater is arranged at the outlet of the cold side of the primary cold energy heat exchanger, the auxiliary heater is communicated with the inlet of the gas turbine front-end module, and the inlet of the cold side of the primary cold energy heat exchanger is connected with the outlet of the LNG drying and purifying device.
Preferably, a refrigerant pump and a refrigerant valve are arranged between the hot side inlet of the primary cold energy heat exchanger and the refrigerant tank.
Preferably, the outlet of the cooling water tank is sequentially connected with a cooling water pump and a cooling water valve.
Preferably, the outlet of the water storage tank is provided with a heating water pump and a heating water valve.
An adjusting method of an air inlet temperature adjusting system of an LNG power station combined cycle unit, and when LNG cold energy is recovered, the adjusting method of the adjusting system is as follows:
The dried LNG is divided into two paths, one path of LNG directly enters a steam turbine through an LNG gasification device, the other path of LNG enters the cold side of the primary cold energy heat exchanger and exchanges heat with the refrigerant on the hot side of the primary cold energy heat exchanger, the LNG after heat exchange and temperature rise enters the steam turbine, the refrigerant after heat exchange enters the cold side of the secondary cold energy heat exchanger and exchanges heat with cooling water on the hot side of the secondary cold energy heat exchanger, and the refrigerant after heat exchange enters the hot side of the primary cold energy heat exchanger again to form circulation;
The refrigerant on the hot side of the primary cold energy heat exchanger exchanges heat with LNG on the cold side of the primary cold energy heat exchanger, enters the cold side of the secondary cold energy heat exchanger, exchanges heat with cooling water on the hot side of the secondary cold energy heat exchange system, and returns to the refrigerant tank to form circulation;
after the cooling water at the hot side of the secondary cold energy heat exchanger exchanges heat with the refrigerant at the cold side, the cooling water enters an air inlet cooler to cool the air inlet of the combined cycle unit, and after the temperature is raised, the cooling water enters the hot side of the secondary cold energy heat exchanger again to form circulation.
Preferably, when the LNG vaporization cold energy recovery device is turned off, LNG cold energy recovery is stopped, and the dried LNG is vaporized into natural gas by the vaporizing device and directly supplied to the gas turbine.
Preferably, the unit flue gas waste heat recovery device is started, circulating water in the water storage tank enters the heat energy heat exchanger to exchange heat with unit flue gas and heat, after the flue gas waste heat is recovered, the heated water enters the air inlet heater to heat the air inlet of the combined cycle unit, and after the temperature is reduced, the water is returned to the water storage tank to form air inlet heating circulation.
Compared with the prior art, the invention has the following beneficial technical effects:
The invention discloses an air inlet temperature regulating system of an LNG power station combined cycle unit, which comprises an LNG gasification cold energy recovery device and a unit flue gas waste heat recovery device, wherein cold energy in the LNG gasification process is recovered through a two-stage cold energy heat exchange system in a high-temperature season in the LNG gasification cold energy recovery and utilization link to prepare cooling water for cooling the air inlet of the unit, and the air inlet temperature of the unit is reduced, so that the output and the heat efficiency of the unit are increased, and the peak regulation performance of the combined cycle unit is improved. In the low-temperature season link, the smoke waste heat recovery and utilization link recovers the smoke waste heat in the power generation process of the combined cycle unit through the heat energy heat exchange system to prepare hot water, so that the air inlet of the unit is heated, the air temperature entering the unit can be prevented from being lower than the dew point temperature, the water contained in the air is frozen to threaten the safe operation of the unit, and the net efficiency of the unit during loading can be improved.
Drawings
Fig. 1 is a schematic diagram of an intake air temperature adjusting system and method of an LNG power station combined cycle unit provided by the present invention.
In the figure: 1 is an LNG low-temperature storage tank; 2 is an LNG drying and purifying device; 3 is an LNG gasification device; 4 is a gas turbine front-end module; 5 is a gas turbine; 6 is the gas turbine inlet channel; 7 is a flue gas channel of the waste heat boiler; 8 is a chimney; 9 is a refrigerant tank; 10 is a refrigerant pump; 11 is a refrigerant valve; 12 is a primary cold energy heat exchanger; 13 is an auxiliary heater; 14 is a cooling water tank; 15 is a cooling water pump; 16 is a cooling water valve; 17 is a secondary cold energy heat exchanger; 18 is an intake air cooler; 19 is a water storage tank; 20 is a heating water pump; 21 is a heating water valve; 22 is a heat energy exchanger; 23 is an intake air heater.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which illustrate but do not limit the invention.
As shown in fig. 1, the air inlet temperature regulating system of the LNG power station combined cycle unit provided by the invention comprises an LNG gasification cold energy recovery device arranged beside an LNG low-temperature storage tank 1 and a unit flue gas waste heat recovery device arranged near a waste heat boiler.
The LNG gasification cold energy recovery device comprises a primary cold energy heat exchanger 12, a refrigerant tank 9, a secondary cold energy heat exchanger 17 and a cooling water tank 14;
The cold side of the primary cold energy heat exchanger 12 is connected with the LNG gasification device 3 in parallel, the hot side of the primary cold energy heat exchanger 12, the cold side of the refrigerant tank 9 and the cold side of the secondary cold energy heat exchanger 17 are connected in series, the hot side of the secondary cold energy heat exchanger 17 is connected in series with the cooling water tank and the air inlet cooler 18, and the air inlet cooler 18 is arranged in the air inlet channel 6 of the gas turbine.
The unit flue gas waste heat recovery device comprises a water storage tank 19, a heat energy heat exchanger 22 and an air inlet heater 23 which are sequentially connected in series, wherein the heat energy heat exchanger 22 is arranged in the gas turbine air inlet channel 6, and the air inlet heater 22 is arranged in the waste heat boiler flue gas channel 7.
The inlet end of the LNG gasification device 3 is connected with the LNG low-temperature storage tank 1 through the LNG drying and purifying device 2, and the outlet end of the LNG gasification device 3 is connected with the gas turbine 5 through the gas turbine front-end module 4.
The export of the cold side of one-level cold energy heat exchanger 12 is provided with assists the heat exchanger 13, assists the entry intercommunication of heat exchanger 13 and gas turbine front-end module 4, and the entry of the cold side of one-level cold energy heat exchanger 12 is connected with the export of LNG dry purification device, when needs carry out cold energy recovery, then closes LNG gasification equipment 3, and the cold side that gets into one-level cold energy heat exchanger 12 through dry LNG carries out heat transfer, and the LNG after the heat transfer is heated through assisting heat exchanger 13, and complete gasification is as fuel entering gas turbine front-end module 4.
A refrigerant pump 10 and a refrigerant valve 11 are arranged between the hot side inlet of the primary cold energy heat exchanger 12 and the refrigerant tank 9, and the refrigerant valve 11 is opened to start the refrigerant pump 10 so that the refrigerant circulates on the hot side of the primary cold energy heat exchanger 12.
The outlet of the cooling water tank 14 is sequentially connected with a cooling water pump 15 and a cooling water valve 16, the cooling water pump 15 inputs cooling water in the cooling water tank 14 to the cold side inlet of the secondary cold energy heat exchanger, and after the cooling water exchanges heat with a refrigerant, the cooling water enters the air inlet cooler through the cold side outlet of the secondary cold energy heat exchanger, and after cooling gas, the cooling water flows back to the cooling water tank again to form circulation.
The outlet of the water storage tank is provided with a heating water pump 20 and a heating water valve 21, the water storage enters the heat energy heat exchanger through the heating water pump 20 and the heating water valve 21 to cool the flue gas, then enters the air inlet heater through the outlet of the heat energy heat exchanger, and returns to the water storage tank to form circulation after heat exchange again.
The adjusting method of the air inlet temperature adjusting system of the LNG power station combined cycle unit provided by the invention is described in detail below.
When the LNG gasification cold energy recovery device is not required to work in low-temperature seasons, the LNG gasification cold energy recovery device is closed through the regulating valve group, LNG in the LNG low-temperature storage tank 1 is dried and purified, and then gasified into natural gas through the gasification device 3 such as the original high-pressure water bath type gasifier of the power station, and the natural gas enters the gas turbine front-end module 4 as fuel and is supplied to the gas turbine 5.
When the LNG gasification cold energy recovery device is required to work in a high-temperature season, the LNG gasification cold energy recovery device is started through the regulating valve group, part of LNG treated in the drying and purifying device 2 directly enters the gas turbine front-end module through the LNG gasification device and then enters the steam turbine, normal power generation gas of the combined cycle unit is ensured, the other part of LNG enters the LNG gasification cold energy recovery device, the LNG gasification cold energy recovery device utilizes the two-stage cold energy heat exchange system to recover cold energy in the LNG gasification process to prepare cooling water, the cooling water is used for cooling unit air inlet, and unit air inlet temperature is reduced.
The other part of LNG enters the cold side of the primary cold energy heat exchanger 12, exchanges heat with the refrigerant on the hot side of the primary cold energy heat exchanger 12, heats and gasifies the LNG after heat exchange and temperature rise through the auxiliary heater, and then completely gasifies the LNG as fuel to enter the gas turbine front-end module 4 and finally enters the steam turbine;
the refrigerant in the refrigerant tank 9 enters the primary cold energy heat exchanger 12 through the regulation and control of the refrigerant pump 10 and the refrigerant valve 11, enters the cold side of the secondary cold energy heat exchanger 17 after exchanging heat with LNG, and returns to the refrigerant tank 9 to form circulation after exchanging heat with cooling water on the hot side of the secondary cold energy heat exchange system.
Cooling water in the cooling water tank 14 of the secondary heat exchange system enters the secondary cold energy heat exchanger 17 through the control of the cooling water pump 15 and the cooling water valve 16, exchanges heat with a refrigerant of the primary cold energy heat exchange system, enters the air inlet cooler 18 to cool air inlet of the combined cycle unit, and returns to the cooling water tank 14 after being heated to form air inlet cooling circulation.
When the unit flue gas waste heat recovery device is started to work in a low-temperature season, the heat energy heat exchange system is used for recovering the flue gas waste heat in the power generation process of the combined cycle unit to prepare hot water, so that the air inlet of the unit is heated, and the danger of unit operation caused by the fact that the air inlet temperature of the unit is too low is prevented. Circulating water in the water storage tank 19 enters a heat energy heat exchanger 22 through the regulation and control of a heating water pump 20 and a heating water valve 21, exchanges heat with the unit smoke and heats, after the smoke waste heat is recovered, the heated water enters an air inlet heater 23 to heat the air inlet of the combined cycle unit, and after the temperature is reduced, the water returns to the water storage tank 19 to form an air inlet heating cycle.
The heat energy heat exchanger of the unit flue gas waste heat recovery device is required to be arranged at a proper position in the tail flue of the combined cycle unit waste heat boiler according to detailed heat exchange calculation design. Similarly, an air inlet cooler of the LNG gasification cold energy recycling link and an air inlet heater of the unit flue gas waste heat recycling link also need to be arranged at a proper position in an air inlet channel of a gas turbine of the combined cycle unit according to detailed heat exchange calculation design.
According to the invention, the heat exchange device is additionally arranged on the gas turbine air inlet channel and the tail flue of the waste heat boiler, although a certain resistance loss is generated on the air side and the flue gas side of the thermodynamic system of the unit, through preliminary measurement and calculation of the M701F4 gas turbine combined cycle unit, the gas turbine air inlet resistance loss is not more than 1.4kPa, the waste heat boiler smoke exhaust resistance loss is not more than 0.6kPa, the thermodynamic system resistance loss of the unit is small, and the resistance of the heat exchanger can be further reduced through the optimal design, so that the trend of optimizing the overall performance of the unit is not changed.
The LNG gasification cold energy recycling link is operated in a high-temperature season, so that the output and the heat efficiency of the combined cycle unit can be increased, the peak shaving performance of the unit is improved, for example, the air inlet temperature of the M701F4 type gas turbine combined cycle unit is cooled from 42 ℃ to 32 ℃, the net output of the unit is increased by about 23MW, and the net efficiency is improved by about 0.6 percentage point.
In the low-temperature season operation unit flue gas waste heat recovery and utilization link, the air temperature entering the unit can be prevented from being lower than the dew point temperature, water contained in the air is frozen to threaten the safe operation of the unit, and the net efficiency of the unit when the unit is fully loaded can be improved, for example, the air inlet temperature of the M701F4 type gas turbine combined cycle unit is heated to 10 ℃ from-5 ℃, and the net efficiency of the unit is increased by about 0.4 percent.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. The air inlet temperature regulating system of the LNG power station combined cycle unit is characterized by comprising an LNG gasification cold energy recovery device and a unit flue gas waste heat recovery device;
The LNG gasification cold energy recovery device comprises a primary cold energy heat exchanger (12), a refrigerant tank (9), a secondary cold energy heat exchanger (17) and a cooling water tank (14); the cold side of the primary cold energy heat exchanger (12) is connected with the LNG gasification device (3) in parallel, the hot side of the primary cold energy heat exchanger (12), the cold side of the refrigerant tank (9) and the cold side of the secondary cold energy heat exchanger (17) are connected in series, the hot side of the secondary cold energy heat exchanger (17) is connected in series with the cooling water tank and the air inlet cooler (18), and the air inlet cooler (18) is arranged in the air inlet channel (6) of the gas turbine; a refrigerant pump (10) and a refrigerant valve (11) are arranged between the hot side inlet of the primary cold energy heat exchanger (12) and the refrigerant tank (9); the outlet of the cooling water tank (14) is sequentially connected with a cooling water pump (15) and a cooling water valve (16);
The unit flue gas waste heat recovery device comprises a water storage tank (19), a heat energy heat exchanger (22) and an air inlet heater (23) which are sequentially connected in series, wherein the heat energy heat exchanger (22) is arranged in an air inlet channel (6) of the gas turbine, and the air inlet heater (23) is arranged in a flue gas channel (7) of the waste heat boiler;
The adjusting method of the air inlet temperature adjusting system of the LNG power station combined cycle unit comprises the following steps of:
when LNG cold energy is recovered, the adjusting method of the adjusting system is as follows:
The dried LNG is divided into two paths, one path of LNG directly enters a steam turbine through an LNG gasification device, the other path of LNG enters the cold side of the primary cold energy heat exchanger (12) and exchanges heat with the refrigerant on the hot side of the primary cold energy heat exchanger (12), the LNG after heat exchange and temperature rise enters the steam turbine, the refrigerant after heat exchange enters the cold side of the secondary cold energy heat exchanger (17) and exchanges heat with cooling water on the hot side of the secondary cold energy heat exchanger (17), and the refrigerant enters the hot side of the primary cold energy heat exchanger (12) again after heat exchange and forms circulation;
The refrigerant on the hot side of the primary cold energy heat exchanger (12) exchanges heat with LNG on the cold side of the primary cold energy heat exchanger (12), then enters the cold side of the secondary cold energy heat exchanger (17), exchanges heat with cooling water on the hot side of the secondary cold energy heat exchange system, and returns to the refrigerant tank (9) to form circulation;
After the cooling water at the hot side of the secondary cold energy heat exchanger (17) exchanges heat with the refrigerant at the cold side, the cooling water enters an air inlet cooler (18) to cool the air inlet of the combined cycle unit, and after the temperature is raised, the cooling water enters the hot side of the secondary cold energy heat exchanger (17) again to form circulation;
The unit flue gas waste heat recovery device is started, circulating water in the water storage tank (19) enters the heat energy heat exchanger (22) to exchange heat with unit flue gas to raise temperature, after the flue gas waste heat is recovered, the water after the temperature rise enters the air inlet heater (23) to heat the air inlet of the combined cycle unit, and after the temperature is lowered, the water returns to the water storage tank (19) to form air inlet heating circulation.
2. The air inlet temperature regulating system of the LNG power station combined cycle unit according to claim 1, wherein the inlet end of the LNG gasification device (3) is connected with the LNG low-temperature storage tank (1) through the LNG drying and purifying device (2), and the outlet end of the LNG gasification device (3) is connected with the gas turbine (5) through the gas turbine front-end module (4).
3. The air inlet temperature regulating system of the LNG power station combined cycle unit according to claim 1, wherein an auxiliary heater (13) is arranged at an outlet of the cold side of the primary cold energy heat exchanger (12), the auxiliary heater (13) is communicated with an inlet of a gas turbine front-end module (4), and an inlet of the cold side of the primary cold energy heat exchanger (12) is connected with an outlet of an LNG drying and purifying device.
4. The air inlet temperature regulating system of the LNG power station combined cycle unit according to claim 1, wherein the outlet of the water storage tank is provided with a heating water pump (20) and a heating water valve (21).
5. The LNG plant combined cycle plant intake air temperature regulation system according to claim 1, wherein when the LNG gasification cold energy recovery device is turned off, LNG cold energy recovery is stopped, and the dried LNG is gasified into natural gas by the gasification device (3) and directly supplied to the gas turbine (5).
6. The LNG power station combined cycle unit air inlet temperature regulating system according to claim 1 is characterized in that a unit flue gas waste heat recovery device is started, circulating water in a water storage tank (19) enters a heat energy heat exchanger (22) to exchange heat with unit flue gas to raise temperature, after flue gas waste heat is recovered, the raised water enters an air inlet heater (23) to heat the combined cycle unit air inlet, and after cooling, the water returns to the water storage tank (19) to form an air inlet heating cycle.
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