CN112576375B - System and method for utilizing cold and heat quantity between coal presses of low-heat-value combined cycle unit - Google Patents
System and method for utilizing cold and heat quantity between coal presses of low-heat-value combined cycle unit Download PDFInfo
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- CN112576375B CN112576375B CN202011595034.1A CN202011595034A CN112576375B CN 112576375 B CN112576375 B CN 112576375B CN 202011595034 A CN202011595034 A CN 202011595034A CN 112576375 B CN112576375 B CN 112576375B
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
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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
- F02C7/22—Fuel supply systems
- F02C7/236—Fuel delivery systems comprising two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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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]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
Abstract
The invention provides a low-heat value combined cycle unit coal press indirect heat utilization system and a method, wherein the indirect heat utilization system comprises an indirect heat system, an indirect heat exchange medium flowing in the indirect heat system, an indirect heat pump arranged on the indirect heat system, a coal press intermediate heat exchanger and a boiler water supply heat exchanger, the indirect heat exchange medium in the indirect heat system is heated in the process of cooling high-temperature high-pressure coal gas in the coal press intermediate heat exchanger, and flows through the boiler water supply heat exchanger through the indirect heat system to heat boiler water supply positioned in the boiler water supply heat exchanger, so that the water supply temperature of a boiler is increased, and the indirect heat is fully utilized; meanwhile, the exhaust gas temperature of the boiler is improved, corrosion of a tail heat exchange surface is prevented, namely, the heat exchange area of a low-pressure part of the waste heat boiler is not required to be reduced, more steam can be generated by the unit, and the efficiency of the combined cycle unit is improved.
Description
Technical Field
The invention relates to the field of combined cycle units, in particular to a system and a method for utilizing cold and heat quantity between coal presses of a low-heat-value combined cycle unit.
Background
The steel industry is a resource and energy intensive industry, and process gas with lower heat value can be generated in the process of the steel industry: blast furnace gas, coke oven gas, converter gas and the like, and steel plants usually use the low-heating-value process gas as fuel to construct self-contained power plants, wherein a gas-steam combined cycle unit (called a combined cycle unit for short) with the characteristics of large single-unit capacity, small occupied area, environmental protection, high efficiency and the like becomes the optimal choice.
The method is applicable to a gas turbine (abbreviated as a combustion engine) in a combined cycle unit of low-calorific-value fuel, and has certain pressure requirement on the fuel. The low-calorific-value fuel is generally normal pressure, a gas compressor (abbreviated as a coal press) is required to be used for raising the fuel pressure to the fuel pressure required by the fuel engine, and the low-calorific-value fuel is required to be realized in a sectional compression and intermediate cooling (abbreviated as indirect cooling) mode in the fuel compression process due to the higher outlet pressure of the coal press, so that a large amount of low-quality heat exists in an indirect cooling system.
The method is characterized in that the sulfide content in low-heat-value gas generated in the technical process of the steel plant is higher, the flue gas exhausted by the gas turbine is higher in dew point temperature due to the high content of oxygen-sulfur compounds, and in order to prevent the corrosion problem of the tail heat exchange surface of the waste heat boiler in the combined cycle unit, the exhaust gas temperature of the waste heat boiler is required to be ensured to be higher, and the heat exchange surface of the low-pressure part of the waste heat boiler is usually reduced, so that the high exhaust gas temperature is ensured by a method for reducing the steam yield. Reducing low pressure steam production results in reduced unit energy utilization, i.e., combined cycle unit efficiency, as compared to conventional fuel (no/very little sulfide) combined cycle units.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a system and a method for utilizing cold and heat quantity between coal presses of a low-heat-value combined cycle unit, which fully utilize the cold and heat quantity between the coal presses and deepen energy cascade utilization.
The invention provides a cold and heat utilization system between coal compressors of a low-heat-value combined cycle unit, which comprises a gas compressor, a gas turbine, a waste heat boiler, a steam turbine, a condenser, a fuel pipeline, a flue gas pipeline, a water supply pipeline and a steam pipeline, wherein the water supply pipeline is connected with the gas compressor; the gas compressor is communicated with the gas turbine through a fuel pipeline, the gas turbine is communicated with the waste heat boiler through a flue gas pipeline, the waste heat boiler is communicated with the steam turbine through a steam pipeline, and the steam turbine, the condenser and the waste heat boiler are sequentially communicated through a water supply pipeline; the indirect cooling heat system comprises an indirect cooling pipeline, an indirect cooling heat exchange medium flowing in the indirect cooling pipeline, an indirect cooling pump arranged on the indirect cooling pipeline, a coal press intermediate heat exchanger and a boiler water supply heat exchanger, wherein the cold side of the coal press intermediate heat exchanger is communicated with the hot side of the boiler water supply heat exchanger through the indirect cooling pipeline; the gas compressor comprises a high-pressure section of the coal press and a low-pressure section of the coal press, an indirect cooling fuel pipeline is connected between a fuel outlet of the low-pressure section of the coal press and a fuel inlet of the high-pressure section of the coal press, and the indirect cooling fuel pipeline is communicated with the hot side of the middle heat exchanger of the coal press; and a water supply pipeline connected between the condenser and the waste heat boiler is communicated with the cold side of the boiler water supply heat exchanger.
Furthermore, the indirect cooling heat system further comprises a surface cooler group, wherein the surface cooler group is communicated with an air inlet of the gas turbine through an air pipeline, and an indirect cooling pipeline connected with the outlet side of the intermediate heat exchanger of the coal press is also communicated with the surface cooler group.
Further, the indirect cooling heat system further comprises a surface cooler group and an absorption refrigeration system, the surface cooler group is communicated with an air inlet of the gas turbine through an air pipeline, the absorption refrigeration system comprises an absorption refrigerator, a freezing water pipe and a freezing water pump arranged on the freezing water pipe, the absorption refrigerator comprises a refrigerator generator and a refrigerator evaporator which are connected, the indirect cooling pipeline connected with the outlet side of the intermediate heat exchanger of the coal compressor is also communicated with the refrigerator generator, and the refrigerator evaporator is communicated with the surface cooler group through the freezing water pipe.
Furthermore, the cold and hot quantity utilization system between the low-heat value combined cycle unit coal presses further comprises a cooling system, the cooling system comprises a cooling water pipeline and an indirect cold and hot quantity cooler, the indirect cold pipeline connected between the boiler water supply heat exchanger and the coal press intermediate heat exchanger is communicated with the hot side of the indirect cold and hot quantity cooler, and the cold side of the indirect cold and hot quantity cooler is communicated with the cooling water pipeline.
Further, the cooling medium flowing in the cooling water pipeline is open water.
Furthermore, the indirect cooling heat exchange medium is closed water.
The invention provides another cold and heat utilization system between coal compressors of a low-heat-value combined cycle unit, which comprises a gas compressor, a gas turbine, a waste heat boiler, a steam turbine, a condenser, a fuel pipeline, a water supply pipeline and a steam pipeline; the gas compressor is communicated with the gas turbine through a fuel pipeline, the gas turbine is communicated with the waste heat boiler through a flue gas pipeline, the waste heat boiler is communicated with the steam turbine through a steam pipeline, and the steam turbine, the condenser and the waste heat boiler are sequentially communicated through a water supply pipeline; the system also comprises an indirect heat and cold system, wherein the indirect heat and cold system comprises a coal press intermediate heat exchanger; the gas compressor comprises a high-pressure section of the coal press and a low-pressure section of the coal press, an indirect cooling fuel pipeline is connected between a fuel outlet of the low-pressure section of the coal press and a fuel inlet of the high-pressure section of the coal press, and the indirect cooling fuel pipeline is communicated with the hot side of the middle heat exchanger of the coal press; and a water supply pipeline connected between the condenser and the waste heat boiler is communicated with the cold side of the intermediate heat exchanger of the coal press.
The invention also provides a cold and heat quantity utilization method between the coal compressors of the low-heat-value combined cycle unit, when the gas turbine runs, the indirect cooling pump and the water supply heat exchanger are started, and the indirect cooling heat exchange medium enters the middle heat exchanger of the coal compressors and exchanges heat with fuel passing through the indirect cooling fuel pipeline; after the indirect cooling heat exchange medium in the indirect cooling pipeline is heated, the indirect cooling heat exchange medium is used as a heat source to enter the boiler water supply heat exchanger to heat the condensed water from the water supply pipeline, and the condensed water enters the waste heat boiler after being heated.
Further, the indirect heat and cold energy system further comprises a surface cooler group, wherein the surface cooler group is communicated with an air inlet of the gas turbine through an air pipeline, and an indirect cooling pipeline connected with the outlet side of the intermediate heat exchanger of the coal press is also communicated with the surface cooler group; when the inlet air of the gas turbine is required to be heated, the surface cooler group is started, and the high Wen Jian cold heat exchange medium extracted from the outlet of the intermediate heat exchanger of the coal press by the surface cooler group is used as a heat source to heat the air flowing into the surface cooler group; the heated air flows into the gas turbine through an air duct.
Further, the indirect heat and cold energy system also comprises an absorption refrigeration system, the absorption refrigeration system comprises an absorption refrigerator, a chilled water pipe and a chilled water pump arranged on the chilled water pipe, the absorption refrigerator comprises a refrigerator generator and a refrigerator evaporator which are connected, an indirect cooling pipeline connected with the outlet side of the coal press intermediate heat exchanger is also communicated with the refrigerator generator, and the refrigerator evaporator is communicated with the surface cooler group through the chilled water pipe; when the inlet air of the gas turbine is required to be cooled, the high Wen Jian cold heat exchange medium extracted from the outlet of the intermediate heat exchanger of the coal press by the surface cooler group is cut off; starting the absorption refrigerator and the chilled water pump, wherein the absorption refrigerator extracts a high Wen Jian cold heat exchange medium from an outlet of a middle heat exchanger of the coal press as a driven heat source, and after the absorption refrigerator is driven, chilled water generated by an evaporator of the refrigerator enters a surface cooler group to cool air flowing into the surface cooler group; after being cooled, the air flows into the gas turbine through the air duct.
As described above, the cold and hot energy utilization system and method between the coal presses of the low-heat-value combined cycle unit have the following beneficial effects:
in the invention, the indirect cooling heat exchange medium in the indirect cooling heat quantity system is heated in the process of cooling high-temperature high-pressure coal gas in the middle heat exchanger of the coal press, and flows through the boiler feed water heat exchanger by the indirect cooling pipeline to heat the boiler feed water flowing through the boiler feed water heat exchanger, thereby not only improving the feed water temperature of the boiler and fully utilizing the indirect cooling heat quantity; meanwhile, the exhaust gas temperature of the boiler is improved, corrosion of a tail heat exchange surface is prevented, namely, the heat exchange area of a low-pressure part of the waste heat boiler is not required to be reduced, more steam can be generated by the unit, and the efficiency of the combined cycle unit is improved. And the indirect cooling heat quantity system can also comprise a surface cooler group which is used for heating the inlet air temperature of the gas turbine by utilizing the indirect cooling heat quantity, so that the load rate of the gas turbine can be improved as much as possible under a limited load, and the efficiency of the combined cycle unit is improved under the condition that the power of the combined cycle unit is unchanged. Furthermore, the indirect cooling heat quantity system can also comprise an absorption refrigeration system, when the unit is in a high-temperature working condition, the indirect cooling heat quantity is used for driving the absorption refrigerator in the indirect cooling heat quantity system, the temperature of air at the inlet of the gas turbine is reduced through the surface cooler group, and further the output of the unit is improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a cold and heat utilization system between coal presses of a low heating value combined cycle unit according to the present invention;
FIG. 2 is a schematic diagram of a second embodiment of a system for utilizing cold and heat energy between coal presses of a low heating value combined cycle unit.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the invention for which the invention may be practiced or for which the relative relationships may be altered or modified without materially altering the technical context.
Embodiment one of cold and heat utilization system between coal presses of low-heat-value combined cycle unit
As shown in fig. 1, the invention provides a first embodiment of a cold and heat utilization system between coal compressors of a low-heat value combined cycle unit, which comprises a gas compressor 10, a gas turbine 20, a waste heat boiler 30, a steam turbine 40, a condenser 41, a fuel pipeline 21, a flue gas pipeline 22, a water supply pipeline 42 and a steam pipeline 43; the gas compressor 10 is communicated with the gas turbine 20 through a fuel pipeline 21, the gas turbine 20 is communicated with the waste heat boiler 30 through a flue gas pipeline 22, the waste heat boiler 30 is communicated with the steam turbine 40 through a steam pipeline 43, and the steam turbine 40, the condenser 41 and the waste heat boiler 30 are sequentially communicated through a water supply pipeline 42; meanwhile, the indirect heat utilization system of the low-heat value combined cycle unit coal press also comprises an indirect heat system, wherein the indirect heat system comprises an indirect cooling pipeline 51, an indirect cooling heat exchange medium flowing in the indirect cooling pipeline 51, an indirect cooling pump 52 arranged on the indirect cooling pipeline, a coal press intermediate heat exchanger 53 and a boiler feedwater heat exchanger 54, and the cold side of the coal press intermediate heat exchanger 53 is communicated with the hot side of the boiler feedwater heat exchanger 54 through the indirect cooling pipeline 51; the gas compressor 10 comprises a high-pressure section 11 of the coal press and a low-pressure section 12 of the coal press, an indirect cooling fuel pipeline 13 is connected between a fuel outlet of the low-pressure section 12 of the coal press and a fuel inlet of the high-pressure section 11 of the coal press, and the indirect cooling fuel pipeline 13 is communicated with the hot side of the intermediate heat exchanger 53 of the coal press; the water feed pipe 42 connected between the condenser 41 and the heat recovery boiler 30 communicates with the cold side of the boiler water feed heat exchanger 54.
During normal operation of the unit, the gas compressor 10 is operated, and the low pressure section 12 of the coal press pressurizes the fuel of low heating value and enters the high pressure section 11 of the coal press via the indirect cooling fuel pipe 13. The temperature of the fuel passing through the indirect cooling fuel pipeline 13 is higher, and the fuel passes through the coal press intermediate heat exchanger 53 to exchange heat with the indirect cooling heat exchange medium, so that the high-temperature high-pressure coal gas is cooled, and meanwhile, the temperature of the indirect cooling heat exchange medium is increased after passing through the coal press intermediate heat exchanger 53. The gas compressor 10 supplies fuel to the gas turbine 20 through the fuel pipe 21, the gas turbine 20 supplies high-temperature flue gas to the exhaust-heat boiler 30 through the flue gas pipe 22, the exhaust-heat boiler 30 supplies steam to the steam turbine 40 through the steam pipe 43, and the steam turbine 40 generates work to output electric energy and circulates through the condenser 41 and the water supply pipe 42. Further, at the intermediate heat exchanger 53 of the coal press, the intermediate heat exchange medium, the temperature of which is raised, enters the hot side of the boiler feed water heat exchanger 54 through the intermediate heat pipe 51, exchanges heat with condensed water (i.e., boiler feed water) passing through the cold side of the boiler feed water heat exchanger 54, thereby raising the temperature of the boiler feed water circulated into the waste heat boiler 30. The heat exchange surface of the tail part of the waste heat boiler 30 is prevented from being corroded, namely the heat exchange area of the low-pressure part of the waste heat boiler 30 is not required to be reduced, so that more steam can be generated by the unit, and the output and the heat efficiency of the combined cycle unit are improved.
As shown in fig. 1, the indirect heat and cold energy system further includes a surface cooler group 60, the surface cooler group 60 is communicated with an air inlet of the gas turbine 20 through an air pipe 61, and the indirect cooling pipe 51 connected to an outlet side of the coal press intermediate heat exchanger 53 is also communicated with the surface cooler group 60. The outlet side of the surface cooler package 60 is also connected to the inlet side of the coal press intermediate heat exchanger 53 via an indirect cooling conduit 51, forming a cycle.
When the combined cycle unit is operated under partial load, the inlet guide vanes of the gas turbine 20 are closed down, the through-flow capacity of the gas compressor is reduced, and the efficiency of the gas turbine 20 and the combined cycle unit is reduced. At this time, the intermediate heat exchange medium having an increased temperature passes through the intermediate heat exchanger 53 of the coal press and enters the surface cooler group 60 through the intermediate heat pipe 51, thereby heating the air entering the gas turbine 20. Under the limited load, the load rate of the combustion engine can be increased as much as possible, so that the efficiency of the combined cycle unit is improved under the condition that the power of the combined cycle unit is unchanged.
As shown in fig. 1, the indirect heat and cold energy system further comprises an absorption refrigeration system, the absorption refrigeration system comprises an absorption refrigerator 70, a chilled water pipe 74 and a chilled water pump 73 arranged on the chilled water pipe 74, the absorption refrigerator 70 comprises a refrigerator generator 71 and a refrigerator evaporator 72 which are connected, the indirect cooling pipeline 51 connected with the outlet side of the coal press intermediate heat exchanger 53 is also communicated with the refrigerator generator 71, and the refrigerator evaporator 72 is communicated with the surface cooler group 60 through the chilled water pipe 74.
The output of the combined cycle unit is reduced along with the increase of the ambient temperature, and the output of the unit can be increased by artificially reducing the temperature of the air at the inlet of the gas compressor of the gas turbine under the high-temperature working condition. At this time, the indirect cooling heat exchange medium having a temperature increased through the coal press intermediate heat exchanger 53 may be blocked from entering the indirect cooling pipe 51 of the surface air cooler group 60, and the indirect cooling heat exchange medium having a temperature increased may be introduced into the generator of the absorption refrigerator 70, and the absorption refrigerator may be driven as a heat source. At this time, the chilled water pump 73 is started, the chilled water in the chilled water pipe 74 passes through the refrigerator evaporator 72, the temperature is further reduced, and the air passing through the surface cooler group 60 is cooled in the surface cooler group 60, so that the output of the unit under the high-temperature working condition is effectively improved. Meanwhile, in the present embodiment, the absorption refrigerator may employ a lithium bromide absorption refrigerator.
As shown in fig. 1, the inter-cooling heat utilization system of the low heat value combined cycle unit coal press further includes a cooling system including a cooling water pipe 80 and an inter-cooling heat cooler 55, an inter-cooling pipe 51 connected between the boiler feed water heat exchanger 54 and an inlet side of the coal press intermediate heat exchanger 53, and an inter-cooling pipe 51 connected between an outlet side of the surface cooler group 60 and an inlet side of the coal press intermediate heat exchanger 53, the inter-cooling pipe 51 connected between an outlet side of the refrigerator generator 71 and an inlet side of the coal press intermediate heat exchanger 53 being in communication with a hot side of the inter-cooling heat cooler 55, and a cold side of the inter-cooling heat cooler 55 being in communication with the cooling water pipe 80. The indirect cooling heat exchange medium which is released by the boiler water supply heat exchanger 54 and the indirect cooling heat exchange medium which is released by the surface cooler group 60 are fully released in the indirect cooling heat quantity cooler 55, are further cooled and cooled, enter the cold side of the coal press intermediate heat exchanger 53 from the indirect cooling pipeline 51 to absorb heat, cool the high-temperature high-pressure coal gas in the indirect cooling fuel pipeline 13, form the circulation of the indirect cooling heat exchange medium in the indirect cooling pipeline, enable the indirect cooling heat exchange medium to be recycled, and improve the stability of an indirect cooling system. As shown in fig. 1, the cooling medium flowing in the cooling water pipe 80 is open water. The indirect cooling heat exchange medium flowing in the indirect cooling pipe 51 is closed water. The general combined unit is generally provided with an open water system and a closed water system, and the cooling system can be directly applied to the open water system of the original combined unit. The indirect cooling system can be improved on the basis of the original closed water system, namely a plurality of pipelines are added on the basis of the original closed water system to serve as an indirect cooling pipeline 51, and a heat exchanger is added to serve as a coal press intermediate heat exchanger 53 and a boiler water supply heat exchanger 54; meanwhile, the indirect heat and cold energy cooler 55 can directly adopt a closed water-open water heat exchanger of the original combined unit, so that the workload of engineering an indirect heat and cold energy system and a cooling system is greatly reduced.
Embodiment II of cold and heat utilization system between coal presses of low-heat-value combined cycle unit
As shown in fig. 2, the invention provides a second embodiment of a cold and heat utilization system between coal compressors of a low-heat value combined cycle unit, which comprises a gas compressor 10, a gas turbine 20, a waste heat boiler 30, a steam turbine 40, a condenser 41, a fuel pipeline 21, a flue gas pipeline 22, a water supply pipeline 42 and a steam pipeline 43; the gas compressor 10, the gas compressor 10 and the gas turbine 20 are communicated through a fuel pipeline 21, the gas turbine 20 and the waste heat boiler 30 are communicated through a flue gas pipeline 22, the waste heat boiler 30 and the steam turbine 40 are communicated through a steam pipeline 43, and the steam turbine 40, the condenser 41 and the waste heat boiler 30 are sequentially communicated through a water supply pipeline 42; the system also comprises an indirect heat quantity system, wherein the indirect heat quantity system comprises a coal press intermediate heat exchanger 53; the gas compressor 10 comprises a high-pressure section 11 of the coal press and a low-pressure section 12 of the coal press, an indirect cooling fuel pipeline 13 is connected between a fuel outlet of the low-pressure section 12 of the coal press and a fuel inlet of the high-pressure section 11 of the coal press, and the indirect cooling fuel pipeline 13 is communicated with the hot side of the intermediate heat exchanger 53 of the coal press; the water feed pipe 42 connected between the condenser 41 and the heat recovery boiler 30 communicates with the cold side of the coal press intermediate heat exchanger 53.
The second embodiment is different from the first embodiment in that the condenser 41 and the water supply pipe 42 of the waste heat boiler 30 are directly connected to the cold side of the intermediate heat exchanger 53 of the coal press, and the intermediate heat exchanger 53 of the coal press directly heats the boiler water supply. The water supply temperature of the boiler can be increased, and the indirect cooling and heating capacity is fully utilized; the exhaust gas temperature of the boiler is improved, corrosion of the tail heat exchange surface is prevented, namely, the heat exchange area of the low-pressure part of the waste heat boiler 30 is not required to be reduced, so that more steam can be generated by the unit, and the output and the heat efficiency of the combined cycle unit are improved.
The embodiment of the invention also provides a cold and heat quantity utilization method among the coal compressors of the low-heat-value combined cycle unit, and the cold and heat quantity utilization system among the coal compressors of the low-heat-value combined cycle unit shown in the figure 1 is used for the first embodiment. The cold and hot energy utilization method between the coal presses of the low-heat-value combined cycle unit specifically comprises the following steps:
when the gas turbine 20 is in operation, the indirect cooling pump 52 and the boiler water supply heat exchanger 54 are started, and the indirect cooling heat exchange medium enters the coal press intermediate heat exchanger 53 and exchanges heat with the fuel passing through the indirect cooling fuel pipeline 13; the indirect cooling heat exchange medium heated in the indirect cooling pipe 51 is used as a heat source to enter the boiler feed water heat exchanger 54 to heat the condensed water from the feed water pipe 42, and the condensed water is heated to enter the waste heat boiler 30. In actual engineering, when the low heat value combined cycle unit and the gas compressor 10 are operated, and the cold and heat utilization system between the coal compressors of the low heat value combined cycle unit is in a working condition of heating water supply of the waste heat boiler 30, only the intermediate heat exchanger 53 of the coal compressor and the water supply heat exchanger 54 of the boiler are required to be started, and after the conduction of the intermediate cooling pipeline 51 which is communicated with the intermediate heat exchanger 53 of the coal compressor and the water supply heat exchanger 54 of the boiler is confirmed, the intermediate cooling pump 52 is started. In this embodiment, the indirect cooling heat exchange medium serving as a heat source is released in the boiler water supply heat exchanger 54, enters the indirect cooling heat quantity cooler 55 for further cooling, and then returns to the inlet of the medium press intermediate heat exchanger 53 to form recycling of the indirect cooling heat exchange medium.
When the inlet air of the gas turbine 20 needs to be heated, the surface cooler group 60 is started, and the high Wen Jian cold heat exchange medium extracted from the outlet of the coal press intermediate heat exchanger 53 by the surface cooler group 60 is used as a heat source to heat the air flowing into the surface cooler group 60; the heated air flows into the gas turbine 20 through the air duct 61. In this embodiment, the high temperature indirect cooling heat exchange medium enters the indirect cooling heat exchanger 55 for further cooling after the heat is released by the surface cooler group 60, and then returns to the inlet of the coal press indirect cooling heat exchanger 53. The cold and hot energy utilization system between the coal compressors of the low heating value combined cycle unit is under the working condition of heating the air at the inlet of the gas turbine 20, which is generally the condition when the gas yield of the unit floats greatly and the load of the gas turbine 20 is lower than 90% of the rated load. In the implementation process, the surface cooler group 60 and the coal press intermediate heat exchanger 53 are only required to be conducted, the surface cooler group 60 and the gas turbine 20 are only required to be conducted, and the surface cooler group 60 is required to be started. At this time, a part of the indirect cooling heat exchange medium heated by the intermediate heat exchanger 53 of the coal press flows through the boiler feedwater heat exchanger 54 to heat the boiler feedwater, and the remaining part flows into the surface air cooler group 60 to heat the air before flowing into the gas turbine 20.
When the inlet air of the gas turbine 20 needs to be cooled, the high Wen Jian cold heat exchange medium extracted from the outlet of the coal press intermediate heat exchanger 53 by the surface air cooler group 60 is cut off; starting the absorption refrigerator 70 and the chilled water pump 73, wherein the absorption refrigerator 70 extracts high Wen Jian cold heat exchange medium from the outlet of the coal press intermediate heat exchanger 53 as a driven heat source, and after the absorption refrigerator 70 is driven, chilled water generated by the refrigerator evaporator 72 enters the surface cooler group 60 to cool air flowing into the surface cooler group 60; the cooled air flows into the gas turbine 20 through the air duct 61.
The cold and hot utilization system between the coal presses of the low heating value combined cycle unit is under the working condition of reducing the temperature of the air at the inlet of the gas turbine 20, which is generally the case when the gas yield floats greatly and the electric load requirement exceeds the corresponding full load power by less than 10% at the ambient temperature. In the actual operation process, only the indirect cooling pipeline 51 of the surface cooler group 60 and the coal press intermediate heat exchanger 53 is required to be cut off, the refrigerator evaporator 72, the chilled water pipe 74 and the surface cooler group 60 are conducted, the coal press intermediate heat exchanger 53 and the refrigerator generator 71 are conducted, the surface cooler is confirmed to be started, and the absorption refrigerator 70 and the chilled water pump are started. At this time, a part of the indirect cooling heat exchange medium heated by the intermediate heat exchanger 53 of the coal press flows through the boiler feedwater heat exchanger 54 to heat the boiler feedwater, and the remaining part flows into the surface cooler group 60, flows into the refrigerator generator 71, and drives the absorption refrigerator to operate.
Of course, in the method for utilizing cold and heat between the coal compressors of the low-heat-value combined cycle unit, the hot side of the boiler water supply heat exchanger 54 may be cut off, and only the surface cooler group 60 and the coal compressor intermediate heat exchanger 53 may be turned on, or the indirect cooling pipeline 51 of the surface cooler group 60 and the coal compressor intermediate heat exchanger 53 may be cut off, and only the refrigerator evaporator 72, the chilled water pipe 74 and the surface cooler group 60 may be turned on. And will not be described in detail herein. The cold and hot quantity utilization method between the coal presses of the low-heat-value combined cycle unit is simple and flexible to operate and suitable for the operation of the low-heat-value combined cycle unit under various working conditions.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. A cold and hot energy utilization system between coal compressors of a low-heat-value combined cycle unit comprises a coal gas compressor (10), a gas turbine (20), a waste heat boiler (30), a steam turbine (40), a condenser (41), a fuel pipeline (21), a water supply pipeline (42), a steam pipeline (43) and a flue gas pipeline (22); the gas compressor (10) is communicated with the gas turbine (20) through a fuel pipeline (21), and the gas turbine (20) is communicated with the waste heat boiler (30) through the flue gas pipeline (22); the waste heat boiler (30) is communicated with the steam turbine (40) through the steam pipeline (43), and the steam turbine (40), the condenser (41) and the waste heat boiler (30) are communicated through the water supply pipeline (42) in sequence; the method is characterized in that:
the system comprises an indirect cooling and heating system, wherein the indirect cooling and heating system comprises an indirect cooling pipeline (51), an indirect cooling heat exchange medium flowing in the indirect cooling pipeline (51), an indirect cooling pump (52) arranged on the indirect cooling pipeline, a coal press intermediate heat exchanger (53) and a boiler water supply heat exchanger (54), and the cold side of the coal press intermediate heat exchanger (53) is communicated with the hot side of the boiler water supply heat exchanger (54) through the indirect cooling pipeline (51); the indirect heat and cold energy system further comprises a surface cooler group (60), wherein the surface cooler group (60) is communicated with an air inlet of the gas turbine (20) through an air pipeline (61), and an indirect cooling pipeline (51) connected with the outlet side of the coal press intermediate heat exchanger (53) is also communicated with the surface cooler group (60); the outlet side of the surface cooler group (60) is connected with the inlet side of the coal press intermediate heat exchanger (53) through the intermediate cooling pipeline (51) to form circulation;
the gas compressor (10) comprises a high-pressure section (11) and a low-pressure section (12) of the coal press, an indirect cooling fuel pipeline (13) is connected between a fuel outlet of the low-pressure section (12) of the coal press and a fuel inlet of the high-pressure section (11) of the coal press, and the indirect cooling fuel pipeline (13) is communicated with the hot side of the intermediate heat exchanger (53) of the coal press;
a water supply pipeline (42) connected between the condenser (41) and the waste heat boiler (30) is communicated with the cold side of the boiler water supply heat exchanger (54).
2. The low heating value combined cycle unit coal compressor inter-cooling heat utilization system according to claim 1, further comprising a surface cooler group (60) and an absorption refrigeration system, wherein the surface cooler group (60) is communicated with an air inlet of the gas turbine (20) through an air pipeline (61), the absorption refrigeration system comprises an absorption refrigerator (70), a chilled water pipe (74) and a chilled water pump (73) arranged on the chilled water pipe (74), the absorption refrigerator (70) comprises a refrigerator generator (71) and a refrigerator evaporator (72) which are connected, an inter-cooling pipeline (51) connected with an outlet side of the coal compressor inter-cooling heat exchanger (53) is further communicated with the refrigerator generator (71), and the refrigerator evaporator (72) is communicated with the surface cooler group (60) through the chilled water pipe (74).
3. The low heating value combined cycle unit coal press inter-cooling heat capacity optimal utilization system according to claim 1, further comprising a cooling system, wherein the cooling system comprises a cooling water pipeline (80) and an inter-cooling heat capacity cooler (55), an inter-cooling pipeline (51) connected between the boiler feed water heat exchanger (54) and the coal press inter-cooling heat exchanger (53) is communicated with the hot side of the inter-cooling heat capacity cooler (55), and the cold side of the inter-cooling heat capacity cooler (55) is communicated with the cooling water pipeline (80).
4. A low heating value combined cycle unit coal compressor room heat and cold energy utilization system according to claim 3, wherein the cooling medium flowing in the cooling water pipeline (80) is open water.
5. The system for utilizing cold and heat between coal presses of a low-heat-value combined cycle unit according to claim 1, wherein the indirect cooling heat exchange medium is closed water.
6. A cold and hot energy utilization system between coal compressors of a low-heat-value combined cycle unit comprises a coal gas compressor (10), a gas turbine (20), a waste heat boiler (30), a steam turbine (40), a condenser (41), a fuel pipeline (21), a water supply pipeline (42), a steam pipeline (43) and a flue gas pipeline (22); the gas compressor (10) is communicated with the gas turbine (20) through the fuel pipeline (21), and the gas turbine (20) is communicated with the waste heat boiler (30) through the flue gas pipeline (22); the waste heat boiler (30) is communicated with the steam turbine (40) through the steam pipeline (43), and the steam turbine (40), the condenser (41) and the waste heat boiler (30) are communicated through the water supply pipeline (42) in sequence; the method is characterized in that: the system also comprises an indirect heat and cold system, wherein the indirect heat and cold system comprises a coal press intermediate heat exchanger (53); the gas compressor (10) comprises a high-pressure section (11) and a low-pressure section (12) of the coal press, an indirect cooling fuel pipeline (13) is connected between a fuel outlet of the low-pressure section (12) of the coal press and a fuel inlet of the high-pressure section (11) of the coal press, and the indirect cooling fuel pipeline (13) is communicated with the hot side of the intermediate heat exchanger (53) of the coal press; a water supply pipeline (42) connected between the condenser (41) and the waste heat boiler (30) is communicated with the cold side of the coal press intermediate heat exchanger (53).
7. A method of using a low heating value combined cycle unit coal press inter-cooling heat utilization system according to claim 1, wherein when the gas turbine (20) is operated, the inter-cooling pump (52) and the boiler feed water heat exchanger (54) are started, and the inter-cooling heat exchange medium enters the coal press inter-cooling heat exchanger (53) and exchanges heat with fuel passing through the inter-cooling fuel pipeline (13); the indirect cooling heat exchange medium heated in the indirect cooling pipeline (51) is used as a heat source to enter the boiler water supply heat exchanger (54) to heat the condensed water from the water supply pipeline (42), and the condensed water enters the waste heat boiler (30) after being heated.
8. The method for utilizing cold and heat energy between coal presses of the low-heat-value combined cycle unit according to claim 7, which is characterized by comprising the following steps: the indirect heat and cold energy system further comprises a surface cooler group (60), wherein the surface cooler group (60) is communicated with an air inlet of the gas turbine (20) through an air pipeline (61), and an indirect cooling pipeline (51) connected with the outlet side of the coal press intermediate heat exchanger (53) is also communicated with the surface cooler group (60);
when the inlet air of the gas turbine (20) needs to be heated, the surface cooler group (60) is started, and a high Wen Jian cold heat exchange medium extracted from the outlet of the coal press intermediate heat exchanger (53) by the surface cooler group (60) is used as a heat source to heat the air flowing into the surface cooler group (60); the heated air flows into the gas turbine (20) through an air duct (61).
9. The method for utilizing cold and heat quantity between coal presses of the low-heat-value combined cycle unit according to claim 8, which is characterized by comprising the following steps of: the indirect cooling and heating system further comprises an absorption refrigeration system, the absorption refrigeration system comprises an absorption refrigerator (70), a chilled water pipe (74) and a chilled water pump (73) arranged on the chilled water pipe (74), the absorption refrigerator (70) comprises a refrigerator generator (71) and a refrigerator evaporator (72) which are connected, an indirect cooling pipeline (51) connected with the outlet side of the coal press intermediate heat exchanger (53) is also communicated with the refrigerator generator (71), and the refrigerator evaporator (72) is communicated with the surface cooler group (60) through the chilled water pipe (74);
when the inlet air of the gas turbine (20) needs to be cooled, the high Wen Jian cold heat exchange medium extracted from the outlet of the coal press intermediate heat exchanger (53) by the surface cooler group (60) is cut off; starting the absorption refrigerator (70) and a chilled water pump (73), wherein the absorption refrigerator (70) extracts high Wen Jian cold heat exchange medium from the outlet of the coal press intermediate heat exchanger (53) as a driven heat source, and after the absorption refrigerator (70) is driven, chilled water generated by the refrigerator evaporator (72) enters the surface air cooler group (60) to cool air flowing into the surface air cooler group (60); after being cooled, the air flows into the gas turbine (20) through the air duct (61).
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