CN112196673A - Air inlet heating system for combined cycle power plant and control method thereof - Google Patents
Air inlet heating system for combined cycle power plant and control method thereof Download PDFInfo
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- CN112196673A CN112196673A CN202010919469.0A CN202010919469A CN112196673A CN 112196673 A CN112196673 A CN 112196673A CN 202010919469 A CN202010919469 A CN 202010919469A CN 112196673 A CN112196673 A CN 112196673A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 184
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000010865 sewage Substances 0.000 claims abstract description 42
- 230000001105 regulatory effect Effects 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- 238000004891 communication Methods 0.000 claims description 14
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 48
- 239000007789 gas Substances 0.000 description 17
- 239000012080 ambient air Substances 0.000 description 8
- 239000002918 waste heat Substances 0.000 description 6
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/16—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
- F22D1/18—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and heated indirectly
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- 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
- F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
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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
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The invention discloses an inlet air heating system for a combined cycle power plant and a control method thereof. The high-low pressure steam drum of the combined cycle power plant boiler continuously discharges sewage to heat the low-pressure heating spiral coil assembly and the high-pressure heating spiral coil assembly, the inlet air heating temperature is higher, and the economical efficiency is better. No additional power equipment is needed, and the equipment and daily maintenance investment is reduced. The step heating is more reasonable, and loudspeaker spiral coil tubular structure has the high sewage of being convenient for of low back before the inclination to collect the emission, and the high point of temperature arranges that it is nearest from the compressor, and air current opposite direction with admitting air, countercurrent flow, high temperature medium are for getting into by the top, and the bottom is for collecting the outflow. During the shutdown state of the system, the drain valve at the bottom outlet and the drain valve at the top inlet of the high-low pressure heating spiral coil assembly are in the open position, and drainage is drained cleanly.
Description
Technical Field
The invention relates to an inlet air heating system for a combined cycle power plant and a control method thereof.
Background
The continuous sewage discharge of the high-pressure steam drum and the low-pressure steam drum of the combined cycle unit waste heat boiler is large in amount, generally 3% -10%, high in temperature and certain in energy quality. At present, the high-pressure and low-pressure steam drum sewage in the gas turbine combined cycle power plant is directly discharged to an expansion tank in the operation process, the drained water of the expansion tank is discharged to a trench after being subjected to temperature reduction, and a sewage water cooler is not arranged to recover part of energy, so that the energy waste is caused. At present, researchers also propose that the boiler high-pressure and low-pressure steam drums are used for continuously discharging sewage and waste heat to generate power, for example, a boiler sewage and waste heat ORC power generation system heats organic working media in an ORC evaporator by using boiler sewage and waste heat, so that the organic working media are heated to be in a gaseous state and enter a gas turbine to expand to do work. Although the system can utilize the heat of continuous sewage, the system is complex, the investment cost is high, the capability of improving the generated energy of the system is limited, and the economic benefit is lower. The invention relates to overall efficiency enhancement in combined cycle power plants, and in particular to an inlet air heating system for a combined cycle power plant for boiler blowdown.
A gas turbine combined cycle power plant typically includes a waste heat boiler, a turbine, a generator, and an auxiliary system. In a typical combined cycle power plant, exhaust gases from the inlet turbine are sent to a Heat Recovery Steam Generator (HRSG) that may be used to reheat the steam and provide the steam to a steam turbine system to increase the efficiency of the system and the power plant. Downstream of the HRSG, the exhaust gases are released into the atmosphere through a stack.
Whether included in a combined cycle power plant or as a stand-alone system, the intake turbine system typically utilizes ambient air within the system to generate a load. Ambient air is introduced into the system via an air inlet housing positioned upstream of a compressor of the intake turbine system. When the intake turbine system is operating in a cold weather environment, the ambient air used by the intake turbine system may be at a temperature that increases the operating efficiency and power output of the intake turbine system at base load demand or operation. However, the intake turbine system is often operated at part load demand. To meet part load demands, the inlet guide vanes of the intake turbine system may be (partially) closed to reduce the amount of intake air drawn into the intake turbine system. However, by reducing the intake air amount, the operating efficiency of the compressor of the intake turbine system is reduced. In turn, the intake turbine system requires additional fuel to meet the desired part load demand and the desired output power.
Other conventional intake turbine systems also include air-to-fluid heat exchanger systems to meet part load demands. These conventional heat exchanger systems may be in fluid communication with the air inlet housing of the air intake turbine system and are typically independent systems and collections of systems from the air intake turbine system and the combined cycle power plant. Conventional heat exchanger systems include heat exchanger components (e.g., coils, tubes, or fins) positioned directly within an inlet housing. The ambient air may contact and flow through the heat exchanger components and may undergo a heat exchange process (e.g., heating) before the ambient air enters the compressor of the intake turbine system. The inlet guide vanes may be held fully open by heating the intake air prior to the intake air entering the compressor of the intake air turbine system. Thus, the operating efficiency of the compressor may not be reduced, and the intake turbine system may meet part load demands with reduced fuel requirements.
The inclusion of a heat exchanger system in the inlet housing may also reduce or eliminate the risk of icing of internal components (e.g., filters) included in the inlet housing. That is, independently of meeting the part load demand and increasing the part load efficiency of the air intake turbine system, the heat exchanger system may also be used as an anti-icing agent for a filter or inlet housing of an air intake turbine system operating in a cold weather environment. While these conventional heat exchanger systems do provide an alternative to (partially) closing the inlet guide vanes and increasing the fuel consumption of the intake turbine system in cold weather environments, they introduce additional complications to the intake turbine system and the combined cycle power plant. For example, conventional heat exchanger systems are relatively independent systems from the intake turbine system and the combined cycle power plant, so they require additional components (e.g., additional heaters, pumps). Thus, the use of conventional heat exchanger systems increases the cost of building/implementing the heat exchanger system within the intake turbine system, as well as the maintenance costs of the conventional heat exchanger system. In addition, the pipes or conduits of conventional heat exchanger systems are not completely drained during intake turbine system shutdown or maintenance, and therefore, conventional heat exchanger system media typically do not use pure water, and the pipes or conduits of the system may freeze out of damage (e.g., burst, rupture) in cold weather environments during intake turbine system shutdown conditions. Conventional heat exchanger systems therefore use a water-glycol mixture to prevent the fluid within the system from freezing during shutdown of the air intake turbine system. The water-glycol mixture is less effective in heating ambient air in cold weather environments due to its less effective heat transfer characteristics than pure water, but this may increase the system and even affect the air side pressure drop.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an air inlet heating system of a combined cycle power plant and a control method thereof, wherein the air inlet heating system is reasonable in structural design, simple to operate and reliable in performance. For the air inlet steam combined cycle unit, the heat of the continuous sewage discharged by the high-pressure and low-pressure steam drums of the waste heat boiler is used for heating the air inlet temperature of the gas turbine combined cycle unit.
The technical scheme adopted by the invention for solving the problems is as follows: an inlet air heating system for a combined cycle power plant, comprising:
the high-pressure heating spiral coil assembly and the low-pressure heating spiral coil assembly are arranged in an inlet shell of the gas turbine system;
a low pressure blow-off valve in communication with a top of the low pressure heating coil assembly, the low pressure blow-off valve allowing air to flow into and out of the low pressure heating coil assembly when the low pressure blow-off valve is in an open position;
a low pressure blow down valve in communication with the bottom of the low pressure heating coil assembly, the low pressure blow down valve allowing sewage to flow out of the low pressure heating coil assembly when the low pressure blow down valve is in an open position;
a high pressure blow-off valve in communication with a top of the high pressure heating coil assembly, the high pressure blow-off valve allowing air to flow into and out of the high pressure heating coil assembly when the high pressure blow-off valve is in an open position;
a high pressure blowoff valve in communication with the bottom of the high pressure heating coil assembly, the high pressure blowoff valve allowing sewage to flow out of the high pressure heating coil assembly when the high pressure blowoff valve is in an open position;
the low-pressure steam drum is connected with a low-pressure sewage supply pipeline, the low-pressure sewage supply pipeline is communicated with the low-pressure heating spiral coil assembly, and the low-pressure sewage supply pipeline provides low-pressure steam water for the low-pressure heating spiral coil assembly;
the high-pressure steam drum is connected with a high-pressure sewage supply pipeline, the high-pressure sewage supply pipeline is communicated with the high-pressure heating spiral coil assembly, and the high-pressure sewage supply pipeline provides high-pressure steam water for the high-pressure heating spiral coil assembly;
a drain line in communication with the high pressure heating coil assembly, the low pressure heating coil assembly, and a blowdown sump of a combined cycle power plant.
Furthermore, the low-pressure steam pocket is sequentially connected with the low-pressure heating spiral coil assembly through a low-pressure steam pocket continuous blowdown electric regulating valve, a low-pressure heating spiral coil assembly electric regulating valve and a filter I, and the low-pressure steam pocket is connected with the flash tank through the low-pressure steam pocket continuous blowdown electric regulating valve and a low-pressure spiral coil I bypass valve; the high-pressure steam pocket is connected with the high-pressure heating spiral coil assembly through the high-pressure steam pocket continuous blowdown electric regulating valve, the high-pressure heating spiral coil assembly electric regulating valve and the filter II in sequence, and the high-pressure steam pocket is connected with the flash tank through the high-pressure steam pocket continuous blowdown electric regulating valve and the high-pressure spiral coil assembly II bypass valve;
the electric regulating valve of the low-pressure heating spiral coil component controls the supply quantity entering the low-pressure heating spiral coil component;
and the electric regulating valve of the high-pressure heating spiral coil component controls the supply amount entering the high-pressure heating spiral coil component.
Furthermore, hot water discharged by the low-pressure steam drum passes through the low-pressure steam drum continuous blowdown electric regulating valve, then passes through the low-pressure heating spiral coil pipe assembly electric regulating valve and the filter I, and then enters the low-pressure heating spiral coil pipe assembly to heat inlet air passing through the low-pressure heating spiral coil pipe assembly, so that the inlet air temperature is preliminarily increased; hot water discharged by the high-pressure steam drum passes through the high-pressure steam drum continuous blowdown electric regulating valve, then passes through the high-pressure heating spiral coil pipe assembly electric regulating valve and the filter II, and then enters the high-pressure heating spiral coil pipe assembly to continuously heat the inlet air after primary temperature rise; the twice heated intake air, through the inlet housing of the gas turbine system, may receive an intake of a fluid (e.g., ambient air) that may be used by the combustion engine system to generate electricity. The high-low pressure heat exchange systems are independently arranged to form energy gradient utilization and enhance the heat exchange effect.
Further, the high-pressure heating spiral coil assembly and the low-pressure heating spiral coil assembly are both horn spiral coil structures and are uniformly and spirally arranged in an inlet shell of the gas turbine system; the sewage is conveniently collected and discharged after the front part is low and the back part is high at a certain inclination angle, the high temperature point is arranged closest to the compressor and is opposite to the direction of the air inlet flow, the heat exchange is carried out in a countercurrent mode, and high-temperature media enter from the top and are collected and flow out from the bottom. The bottom outlet is provided with a low-pressure blowoff valve and a high-pressure blowoff valve, the top inlet is provided with a low-pressure emptying valve and a high-pressure emptying valve, and during the shutdown state of a gas turbine system of a combined cycle power plant, the low-pressure blowoff valve, the high-pressure blowoff valve, the low-pressure emptying valve and the high-pressure emptying valve are in open positions, so that all water in the heating coil assemblies can be emptied conveniently, and the emptying valves and the blowoff valves allow water in the heating coil assemblies to be replaced by air more easily.
Furthermore, after the continuous sewage hot water of the low-pressure steam drum and the high-pressure steam drum are heated and fed respectively, the hot water is discharged to a sewage discharge pit through manual gate valves at the bottoms of the low-pressure heating spiral coil assembly and the high-pressure heating spiral coil assembly respectively.
Furthermore, the continuous sewage discharged by the low-pressure steam pocket is discharged into the flash tank after passing through the low-pressure steam pocket continuous sewage discharge electric regulating valve and the low-pressure spiral coil I bypass valve; and the continuous sewage discharged by the high-pressure steam drum passes through the high-pressure steam drum continuous sewage discharge electric regulating valve and the high-pressure spiral coil pipe II bypass valve and then is discharged into the flash tank.
Further, the inlet housing of the gas turbine system is provided with an inlet screen.
The control method for the inlet air heating system of the combined cycle power plant is characterized by comprising the following steps of: the high-pressure steam pocket continuous blowdown electric regulating valve and the front and rear manual stop valves thereof, the low-pressure spiral coil I bypass valve and the high-pressure spiral coil II bypass valve are all opened, and the high-pressure steam pocket and the low-pressure steam pocket continuously blowdown to the flash tank; along with the increase of the load of the combustion engine, the pressure of the high-pressure steam drum and the low-pressure steam drum gradually rises, the temperature of the continuous blowdown water of the steam drum also gradually rises, when the low-pressure blowdown valve, the high-pressure blowdown valve, the low-pressure exhaust valve and the high-pressure exhaust valve are checked to be in the open positions, slowly adjusting the opening of the electric adjusting valve of the low-pressure heating spiral coil assembly and the electric adjusting valve of the high-pressure heating spiral coil assembly, emptying the high-pressure heating spiral coil assembly and the low-pressure heating spiral coil assembly and heating the heating pipe, closing the low-pressure blow-down valve, the high-pressure blow-down valve, the low-pressure blow-down valve and the high-pressure blow-down valve after the exhaust of the heating pipe is finished, stabilizing the heating system, closing the bypass valve of the low-pressure spiral coil I and the bypass valve of the high-pressure spiral coil II, and cutting all the sewage to the sides of the high-pressure heating spiral coil assembly and the low-pressure heating spiral coil assembly until the high-pressure heating spiral coil assembly and the low-pressure heating spiral coil assembly are stably put into use; the air inlet temperature of the gas turbine is controlled and adjusted by the aid of the bypass valve of the low-pressure spiral coil I, the bypass valve of the high-pressure spiral coil II and the adjusting valve, and the discharge capacity of the high-pressure heating spiral coil assembly and the low-pressure heating spiral coil assembly is controlled, so that the air inlet temperature is controlled.
Compared with the prior art, the invention has the following advantages and effects: the system is simple to modify, low in investment cost, simple to operate by operators, flexible to control, and fast in obtaining economic benefits, low-grade energy can be fully utilized, resource waste is avoided, and optimal configuration of energy resources is promoted.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: the device comprises an inlet filter screen 1, a low-pressure steam pocket 2, a low-pressure heating spiral coil assembly 3, a flash tank 4, a high-pressure steam pocket 5, a high-pressure heating spiral coil assembly 6, a blow-off pit 7, a low-pressure steam pocket continuous blow-off electric adjusting valve 8, a low-pressure heating spiral coil assembly electric adjusting valve 9, a filter I10, a high-pressure steam pocket continuous blow-off electric adjusting valve 11, a high-pressure heating spiral coil assembly electric adjusting valve 12, a filter II 13, a low-pressure spiral coil I bypass valve 14, a high-pressure spiral coil II bypass valve 15, a compressor 16, a turbine 17, a generator 18, a low-pressure emptying valve 31, a low-pressure blow-off valve 32, a high-pressure emptying valve 61, a high-pressure blow-off valve 62, a low-.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to FIG. 1, an inlet air heating system for a combined cycle power plant includes:
the high-pressure heating spiral coil assembly 6 and the low-pressure heating spiral coil assembly 3 are arranged in an inlet shell of the gas turbine system;
a low pressure blow-off valve 31, the low pressure blow-off valve 31 being in communication with the top of the low pressure heating coil assembly 3, the low pressure blow-off valve 31 allowing air to flow into and out of the low pressure heating coil assembly 3 when the low pressure blow-off valve 31 is in an open position;
a low pressure blowoff valve 32, the low pressure blowoff valve 32 being in communication with the bottom of the low pressure heating coil assembly 3, the low pressure blowoff valve 32 allowing the sewage to flow out of the low pressure heating coil assembly 3 when the low pressure blowoff valve 32 is in the open position;
a high pressure blow-off valve 61, the high pressure blow-off valve 61 being in communication with the top of the high pressure heating coil assembly 6, the high pressure blow-off valve 61 allowing air to flow into and out of the high pressure heating coil assembly 6 when the high pressure blow-off valve 61 is in an open position;
the high-pressure blowdown valve 62 is communicated with the bottom of the high-pressure heating spiral coil assembly 6, and when the high-pressure blowdown valve 62 is in an open position, the high-pressure blowdown valve 62 allows sewage to flow out of the high-pressure heating spiral coil assembly 6;
the low-pressure steam drum 2 is connected with a low-pressure blowdown supply pipeline 131, the low-pressure blowdown supply pipeline 131 is communicated with the low-pressure heating spiral coil assembly 3, and the low-pressure blowdown supply pipeline 131 provides low-pressure steam water for the low-pressure heating spiral coil assembly 3;
the high-pressure steam drum 5 is connected with a high-pressure blowdown supply pipeline 161, the high-pressure blowdown supply pipeline 161 is communicated with the high-pressure heating spiral coil assembly 6, and the high-pressure blowdown supply pipeline 161 supplies high-pressure steam water to the high-pressure heating spiral coil assembly 6;
a drain line 171, the drain line 171 being in communication with the high pressure heating coil assembly 6, the low pressure heating coil assembly 3, and the blowdown sump 7 of the combined cycle power plant.
Specifically, the low-pressure steam drum 2 is connected with the low-pressure heating spiral coil assembly 3 through a low-pressure steam drum continuous blowdown electric regulating valve 8, a low-pressure heating spiral coil assembly electric regulating valve 9 and a filter I10 in sequence, and the low-pressure steam drum 2 is connected with the flash tank 4 through the low-pressure steam drum continuous blowdown electric regulating valve 8 and a low-pressure spiral coil I bypass valve 14; the high-pressure steam drum 5 is connected with the high-pressure heating spiral coil assembly 6 through a high-pressure steam drum continuous blowdown electric adjusting valve 11, a high-pressure heating spiral coil assembly electric adjusting valve 12 and a filter II 13 in sequence, and the high-pressure steam drum 5 is connected with the flash tank 4 through the high-pressure steam drum continuous blowdown electric adjusting valve 11 and a high-pressure spiral coil assembly II bypass valve 15;
the electric adjusting valve 9 for the low-pressure heating coil assembly controls the supply quantity entering the low-pressure heating coil assembly 3;
an electric valve 12 for controlling the supply of water to the autoclave coil assembly 6.
Specifically, the low-pressure steam drum 2 and the low-pressure heating coil assembly 3 form a set of low-pressure heat exchange system for preheating incoming air; the high-pressure steam pocket 5 and the high-pressure heating spiral coil assembly 6 form a set of high-pressure heat exchange system for further heating the inlet air; hot water discharged by the low-pressure steam drum 2 passes through the low-pressure steam drum continuous blowdown electric regulating valve 8, then passes through the low-pressure heating spiral coil pipe assembly electric regulating valve 9 and the filter I10, and then enters the low-pressure heating spiral coil pipe assembly 3 to heat inlet air passing through the low-pressure heating spiral coil pipe assembly 3, so that the inlet air temperature is preliminarily increased; hot water discharged by the high-pressure steam drum 5 passes through the high-pressure steam drum continuous blowdown electric adjusting valve 11, then passes through the high-pressure heating spiral coil pipe assembly electric adjusting valve 12 and the filter II 13, and then enters the high-pressure heating spiral coil pipe assembly 6 to continuously heat the inlet air after primary temperature rise; the twice heated intake air, through the inlet housing of the gas turbine system, may receive an intake of a fluid (e.g., ambient air) that may be used by the combustion engine system to generate electricity. The high-low pressure heat exchange systems are independently arranged to form energy gradient utilization and enhance the heat exchange effect.
Specifically, the high-pressure heating spiral coil assembly 6 and the low-pressure heating spiral coil assembly 3 are both of a horn spiral coil structure and are uniformly and spirally arranged in an inlet shell of the gas turbine system; the sewage is convenient to collect and discharge when the front part is lower and the rear part is higher, the temperature high point is arranged closest to the compressor 16 and opposite to the direction of the air inlet flow, the heat exchange is carried out in a countercurrent mode, and high-temperature media enter from the top and collect and flow out from the bottom. The bottom outlet is provided with a low pressure blowoff valve 32, a high pressure blowoff valve 62, the top inlet is provided with a low pressure blow-off valve 31, a high pressure blow-off valve 61, the low pressure blowoff valve 32, the high pressure blowoff valve 62, the low pressure blow-off valve 31 and the high pressure blow-off valve 61 are in an open position during a gas turbine system shutdown state of the combined cycle power plant, facilitating the evacuation of all water in the heating coil assemblies, the blow-off valves and the blow-off valves allowing water in the plurality of heating coil assemblies to be more easily replaced by air. And the actual positions of the whole system equipment are 60 meters high of the steam drum, 20 meters high of the coil heating assembly and minus 0 meter of the sewage pit, and liquid can automatically flow under the action of gravity during the shutdown period of the unit, so that the worry about icing and pipe bursting due to low-temperature accumulated water is avoided.
Specifically, after the continuous blowdown hot water of the low-pressure steam drum 2 and the high-pressure steam drum 5 is heated and fed respectively, the hot water is discharged to a blowdown pit 7 through manual gate valves at the bottoms of the low-pressure heating spiral coil assembly 3 and the high-pressure heating spiral coil assembly 6 respectively.
Specifically, the continuous sewage discharged by the low-pressure steam drum 2 passes through the low-pressure steam drum continuous sewage discharge electric regulating valve 8 and the low-pressure spiral coil I bypass valve 14 and then is discharged into the flash tank 4; the continuous sewage drained from the high-pressure steam pocket 5 passes through the high-pressure steam pocket continuous sewage draining electric regulating valve 11 and the high-pressure spiral coil II bypass valve 15 and then is drained into the flash tank 4.
Specifically, when the low-pressure heating spiral coil assembly 3 needs to be overhauled on line, the bypass valve 14 of the low-pressure spiral coil I can be opened to bypass the low-pressure heating spiral coil assembly; when the intake temperature is high and deep heating is not needed, the heating stage number can be adjusted through the low-pressure spiral coil I bypass valve 14, and therefore the intake temperature of the combustion engine is controlled. When the high-pressure heating spiral coil assembly 6 needs to be overhauled on line, the bypass valve 15 of the high-pressure spiral coil II can be opened to bypass the high-pressure heating spiral coil assembly; when the air inlet temperature is higher and deep heating is not needed, the heating stage number can be adjusted through the bypass valve 15 of the high-pressure spiral coil II, so that the air inlet temperature of the combustion engine is controlled.
In particular, the inlet housing of the gas turbine system is provided with an inlet screen 1.
A method of controlling an inlet air heating system for a combined cycle power plant, the process comprising: the high-pressure steam drum continuous blowdown electric regulating valve 11 and the front and rear manual stop valves thereof, the low-pressure steam drum continuous blowdown electric regulating valve 8 and the front and rear manual stop valves thereof, the low-pressure spiral coil I bypass valve 14 and the high-pressure spiral coil II bypass valve 15 are all opened, and the high-pressure steam drum 5 and the low-pressure steam drum 2 continuously blowdown to the flash tank 4; along with the increase of the load of the combustion engine, the pressure of the high-pressure steam drum 5 and the low-pressure steam drum 2 gradually rises, the temperature of continuous sewage discharged by the steam drum also gradually rises, the opening degrees of the electric regulating valve 9 for the low-pressure heating spiral coil assembly and the electric regulating valve 12 for the high-pressure heating spiral coil assembly are slowly adjusted when the low-pressure blow-down valve 32, the high-pressure blow-down valve 62, the low-pressure exhaust valve 31 and the high-pressure exhaust valve 61 are checked, the high-pressure heating spiral coil assembly 6 and the low-pressure heating spiral coil assembly 3 are evacuated and heated by a heating pipe, after the exhaust of the heating pipe is finished, the low-pressure blow-down valve 32, the high-pressure blow-down valve 62, the low-pressure exhaust valve 31 and the high-pressure exhaust valve 61 are closed, after the heating system is stabilized, the bypass valve 14 of the low-pressure spiral coil I and the, until the high-pressure heating spiral coil assembly 6 and the low-pressure heating spiral coil assembly 3 are stably put into use; the air inlet temperature of the combustion engine is controlled and adjusted by the aid of the low-pressure spiral coil I bypass valve 14, the high-pressure spiral coil II bypass valve 15 and the adjusting valve, the discharge capacity of the high-pressure heating spiral coil assembly 6 and the low-pressure heating spiral coil assembly 3 is controlled, and accordingly the air inlet temperature is controlled.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (8)
1. An inlet air heating system for a combined cycle power plant, comprising:
the high-pressure heating spiral coil assembly (6) and the low-pressure heating spiral coil assembly (3) are arranged in an inlet shell of the gas turbine system, and the high-pressure heating spiral coil assembly (6) and the low-pressure heating spiral coil assembly (3) are arranged in the inlet shell of the gas turbine system;
a low pressure blow-off valve (31), said low pressure blow-off valve (31) in communication with the top of said low pressure heating coil assembly (3), said low pressure blow-off valve (31) allowing air to flow into and out of said low pressure heating coil assembly (3) when the low pressure blow-off valve (31) is in an open position;
a low pressure blow down valve (32), the low pressure blow down valve (32) being in communication with the bottom of the low pressure heating coil assembly (3), the low pressure blow down valve (32) allowing sewage to flow out of the low pressure heating coil assembly (3) when the low pressure blow down valve (32) is in an open position;
a high pressure blow-off valve (61), said high pressure blow-off valve (61) in communication with the top of said high pressure heating coil assembly (6), said high pressure blow-off valve (61) allowing air to flow into and out of said high pressure heating coil assembly (6) when the high pressure blow-off valve (61) is in an open position;
a high pressure blow down valve (62), the high pressure blow down valve (62) being in communication with the bottom of the high pressure heating coil assembly (6), the high pressure blow down valve (62) allowing sewage to flow out of the high pressure heating coil assembly (6) when the high pressure blow down valve (62) is in an open position;
the low-pressure steam drum (2) is connected with a low-pressure blowdown supply line (131), the low-pressure blowdown supply line (131) is communicated with the low-pressure heating spiral coil assembly (3), and the low-pressure blowdown supply line (131) provides low-pressure steam water for the low-pressure heating spiral coil assembly (3);
the high-pressure steam drum (5), the high-pressure steam drum (5) is connected with a high-pressure blowdown supply pipeline (161), the high-pressure blowdown supply pipeline (161) is communicated with the high-pressure heating spiral coil assembly (6), and the high-pressure blowdown supply pipeline (161) provides high-pressure steam water for the high-pressure heating spiral coil assembly (6);
a drain line (171), the drain line (171) communicating with the high pressure heating coil assembly (6), the low pressure heating coil assembly (3), and a sump (7) of the combined cycle power plant.
2. The inlet air heating system for a combined cycle power plant of claim 1, characterized in that the low pressure drum (2) is connected with the low pressure heating spiral coil assembly (3) through a low pressure drum continuous blowdown electric regulating valve (8), a low pressure heating spiral coil assembly electric regulating valve (9), a filter i (10) in sequence, and the low pressure drum (2) is connected with the flash tank (4) through the low pressure drum continuous blowdown electric regulating valve (8) and a low pressure spiral coil i bypass valve (14); the high-pressure steam pocket (5) is connected with the high-pressure heating spiral coil assembly (6) through a high-pressure steam pocket continuous blowdown electric adjusting valve (11), a high-pressure heating spiral coil assembly electric adjusting valve (12) and a filter II (13) in sequence, and the high-pressure steam pocket (5) is connected with the flash tank (4) through the high-pressure steam pocket continuous blowdown electric adjusting valve (11) and a high-pressure spiral coil assembly II bypass valve (15);
the electric adjusting valve (9) of the low-pressure heating spiral coil component controls the supply quantity entering the low-pressure heating spiral coil component (3);
the electric adjusting valve (12) of the high-pressure heating spiral coil component controls the supply amount of the high-pressure heating spiral coil component (6).
3. The inlet air heating system for combined cycle power plant of claim 2, characterized in that the hot water discharged from the low pressure drum (2) passes through the low pressure drum continuous blowdown electric regulating valve (8), then passes through the low pressure heating coil assembly electric regulating valve (9) and the filter i (10), and then enters the low pressure heating coil assembly (3) to heat the inlet air passing through the low pressure heating coil assembly (3) to primarily raise the inlet air temperature; hot water discharged from the high-pressure steam drum (5) passes through the high-pressure steam drum continuous blowdown electric adjusting valve (11), then passes through the high-pressure heating spiral coil pipe assembly electric adjusting valve (12) and the filter II (13), and then enters the high-pressure heating spiral coil pipe assembly (6) to continue to heat the inlet air after primary temperature rise; the twice heated intake air receives an inlet flow of fluid through an inlet housing of the gas turbine system, which is used by the combustion engine system to generate electricity.
4. Inlet air heating system for a combined cycle power plant according to claim 1, characterized in that the high-pressure heating coil assembly (6) and the low-pressure heating coil assembly (3) are both of a trumpet-shaped coil structure, which is uniformly helically arranged in the inlet casing of the gas turbine system.
5. The inlet air heating system for a combined cycle power plant according to claim 3, characterized in that the hot water from the continuous blowdown of the low pressure drum (2) and the high pressure drum (5) is discharged to the blowdown pit (7) through the manual gate valve at the bottom of the low pressure heating coil assembly (3) and the high pressure heating coil assembly (6), respectively, after being heated to the inlet air.
6. The inlet air heating system for a combined cycle power plant of claim 2, wherein the continuous blowdown water of the low pressure drum (2) is discharged into the flash tank (4) after passing through the low pressure drum continuous blowdown electric regulating valve (8) and the low pressure spiral coil i bypass valve (14); and the continuous sewage discharged by the high-pressure steam pocket (5) passes through the high-pressure steam pocket continuous sewage discharge electric regulating valve (11) and the high-pressure spiral coil II bypass valve (15) and then is discharged into the flash tank (4).
7. Inlet heating system for a combined cycle power plant according to claim 1 or 4, characterized in that the inlet casing of the gas turbine system is provided with an inlet screen (1).
8. A method of controlling an inlet air heating system for a combined cycle power plant according to any one of claims 1 to 7, characterised by the following steps: the high-pressure steam pocket continuous blowdown electric adjusting valve (11) and the front and rear manual stop valves thereof, the low-pressure steam pocket continuous blowdown electric adjusting valve (8) and the front and rear manual stop valves thereof, the low-pressure spiral coil I bypass valve (14) and the high-pressure spiral coil II bypass valve (15) are all opened, and the high-pressure steam pocket (5) and the low-pressure steam pocket (2) continuously blowdown to the flash tank (4); along with the increase of the load of the combustion engine, the pressure of a high-pressure steam drum (5) and a low-pressure steam drum (2) gradually rises, the temperature of continuous sewage discharged by the steam drum also gradually rises, the opening degrees of an electric adjusting valve (9) of a low-pressure heating spiral coil pipe assembly and an electric adjusting valve (12) of a high-pressure heating spiral coil pipe assembly are slowly adjusted when a low-pressure blow-down valve (32), a high-pressure blow-down valve (62), a low-pressure emptying valve (31) and a high-pressure emptying valve (61) are in open positions, the high-pressure heating spiral coil pipe assembly (6) and the low-pressure heating spiral coil pipe assembly (3) are emptied and heated by a heating pipe, the low-pressure blow-down valve (32), the high-pressure blow-down valve (62), the low-pressure emptying valve (31) and the high-pressure emptying valve (61) are closed after the heating system is stable, cutting all the sewage to the sides of the high-pressure heating spiral coil assembly (6) and the low-pressure heating spiral coil assembly (3) until the high-pressure heating spiral coil assembly (6) and the low-pressure heating spiral coil assembly (3) are stably put into use; the air inlet temperature of the combustion engine is controlled and adjusted by a bypass valve (14) of a low-pressure spiral coil I, a bypass valve (15) of a high-pressure spiral coil II and an adjusting valve, and the sewage discharge amount entering a high-pressure heating spiral coil assembly (6) and a low-pressure heating spiral coil assembly (3) is controlled, so that the air inlet temperature is controlled.
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| CN202010919469.0A CN112196673A (en) | 2020-09-04 | 2020-09-04 | Air inlet heating system for combined cycle power plant and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010919469.0A CN112196673A (en) | 2020-09-04 | 2020-09-04 | Air inlet heating system for combined cycle power plant and control method thereof |
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