CN213980964U - Cold and heat quantity optimal utilization system between coal press of low-heat-value combined cycle unit - Google Patents
Cold and heat quantity optimal utilization system between coal press of low-heat-value combined cycle unit Download PDFInfo
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- CN213980964U CN213980964U CN202023240178.3U CN202023240178U CN213980964U CN 213980964 U CN213980964 U CN 213980964U CN 202023240178 U CN202023240178 U CN 202023240178U CN 213980964 U CN213980964 U CN 213980964U
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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 utility model provides a cold and heat quantity optimal utilization system between low heat value combined cycle unit coal press, including an inter cold and heat quantity system, the inter cold and heat quantity system includes the intercooling pipeline, circulate in the intercooling medium of exchanging heat in the intercooling pipeline, set up the intercooling pump on this intercooling pipeline, heat exchanger and boiler feedwater heat exchanger in the middle of the coal press, the intercooling medium of exchanging heat in the inter cold and heat quantity system, the high temperature high pressure gas process of cooling is heated in the heat exchanger in the middle of the coal press, and flow through the boiler feedwater heat exchanger by the intercooling pipeline, the boiler feedwater that the heating flow lies in boiler feedwater heat exchanger, not only improve the feedwater temperature of boiler, make full use of inter cold and heat quantity; meanwhile, the exhaust gas temperature of the boiler is improved, the corrosion of a tail heat exchange surface is prevented, namely, the heat exchange area of a low-pressure part of the waste heat boiler does not need to be reduced, so that the unit can generate more steam, and the efficiency of the combined cycle unit is improved.
Description
Technical Field
The utility model relates to a combined cycle unit field especially relates to a cold and heat capacity optimal utilization system between low heat value combined cycle unit coal press.
Background
The steel industry is a resource and energy-intensive industry, and a process gas with a lower heat value is generated in the process: blast furnace gas, coke oven gas, converter gas and the like, and steel plants usually build self-contained power plants by taking the low-heat-value process gas as fuel, wherein a gas-steam combined cycle unit (a combined cycle unit for short) with the characteristics of large single-machine capacity, small occupied area, environmental protection, high efficiency and the like becomes the optimal choice.
The method is suitable for a gas turbine (combustion engine for short) 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 (coal press for short) is needed to raise the fuel pressure to the fuel pressure required by a combustion engine, and the coal press has higher outlet pressure, so that the fuel compression process needs to be realized by adopting a sectional compression mode and an intermediate cooling mode (intermediate cooling for short), and a large amount of low-quality heat exists in an intermediate cooling system.
The low-heat value coal gas generated in the process of the steel plant has high sulfide content, and the flue gas discharged by a gas turbine has high dew point temperature due to high oxygen-sulfur compound content, so that the high exhaust gas temperature of the waste heat boiler needs to be ensured in order to prevent the corrosion problem of the heat exchange surface at the tail part of the waste heat boiler in the combined cycle unit, usually the heat exchange surface at the low-pressure part of the waste heat boiler is reduced, and the high exhaust gas temperature is ensured by reducing the steam yield. The reduced low pressure steam production reduces the unit energy utilization, i.e., the combined cycle unit efficiency, as compared to a conventional fuel (no/minimal sulfide) combined cycle unit.
SUMMERY OF THE UTILITY MODEL
In view of the above disadvantages of the prior art, the technical problem to be solved by the present invention is to provide a system for optimizing and utilizing the cold and heat amount between coal presses of a low-heat value combined cycle unit, which makes full use of the cold and heat amount between rooms and deepens the step utilization of energy.
The utility model provides a system for optimizing and utilizing cold and heat between coal press machines 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; 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 communicated through a water supply pipeline in sequence; 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 coal gas compressor comprises a coal press high-pressure section and a coal press low-pressure section, an indirect cooling fuel pipeline is connected between a fuel outlet of the coal press low-pressure section and a fuel inlet of the coal press high-pressure section, and the indirect cooling fuel pipeline is communicated with the hot side of the coal press intermediate heat exchanger; and a water feeding pipeline connected between the condenser and the waste heat boiler is communicated with the cold side of the boiler water feeding heat exchanger.
Furthermore, the intermediate cooling and heating system further comprises a surface cooler group, the surface cooler group is communicated with an air inlet of the gas turbine through an air pipeline, and an intermediate 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 inter-cooling heat system further comprises a surface cooler group, and the surface cooler group is communicated with an air inlet of the gas turbine through an air pipeline; the intermediate cooling and heating system further comprises an absorption refrigeration system, 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, an intermediate cooling pipeline connected with the outlet side of the intermediate heat exchanger of the coal press is further communicated with the refrigerator generator, and the refrigerator evaporator is communicated with the surface cooler group through the freezing water pipe.
Furthermore, the system for optimizing and utilizing the cold and heat between the coal presses of the low-heat-value combined cycle unit further comprises a cooling system, wherein the cooling system comprises a cooling water pipeline and a cold and heat cooler, an inter-cooling pipeline connected between the boiler feed water heat exchanger and the coal press intermediate heat exchanger is communicated with the hot side of the inter-cooling heat cooler, and the cold side of the inter-cooling heat cooler is communicated with the cooling water pipeline.
Furthermore, the cooling medium circulating in the cooling water pipeline is open water.
Further, the indirect cooling heat exchange medium is closed water.
The utility model provides another kind of low heat value combined cycle unit coal press room cold and heat volume optimal utilization system includes gas compressor, gas turbine, exhaust-heat boiler, steam turbine, condenser, fuel pipe, water supply pipe and steam conduit; 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 communicated through a water supply pipeline in sequence; the system also comprises a room cold and heat energy system, wherein the room cold and heat energy system comprises a coal press middle heat exchanger; the coal gas compressor comprises a coal press high-pressure section and a coal press low-pressure section, an indirect cooling fuel pipeline is connected between a fuel outlet of the coal press low-pressure section and a fuel inlet of the coal press high-pressure section, and the indirect cooling fuel pipeline is communicated with the hot side of the coal press intermediate heat exchanger; and a water feeding 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.
As mentioned above, the utility model relates to a cold and heat quantity optimal utilization system between low heat value combined cycle unit coal press has following beneficial effect:
in the utility model, the indirect cooling heat exchange medium in the indirect cooling heat system is heated in the process of cooling high-temperature high-pressure coal gas in the intermediate heat exchanger of the coal press, and flows through the boiler water supply heat exchanger through the indirect cooling pipeline, and heats boiler water flowing through the boiler water supply heat exchanger, thereby not only improving the water supply temperature of the boiler, but also fully utilizing the indirect cooling heat; meanwhile, the exhaust gas temperature of the boiler is improved, the corrosion of a tail heat exchange surface is prevented, namely, the heat exchange area of a low-pressure part of the waste heat boiler does not need to be reduced, so that the unit can generate more steam, and the efficiency of the combined cycle unit is improved. And the inter-cold heat system can also comprise a surface cooler group which is used for heating the air temperature at the inlet of the gas turbine by using the inter-cold heat, and under the limited load, the load rate of the gas turbine can be improved 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 not changed. Furthermore, the room cooling and heating system can also comprise an absorption refrigeration system, when the unit is in a high-temperature working condition, the room cooling and heating system drives the absorption refrigeration device therein, and the temperature of the air at the inlet of the gas turbine is reduced through the surface cooler unit, so that the output of the unit is improved.
Drawings
FIG. 1 is a schematic diagram of a system for optimizing utilization of cold and heat between coal presses of a combined cycle unit with low heat value according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system for optimizing and utilizing the heat and cold between the coal press rooms of the combined cycle unit with low calorific value according to another embodiment of the present invention.
Reference numerals:
10. a gas compressor; 11. a high-pressure section of the coal press; 12. a low-pressure section of the coal press; 13. an intercooled fuel conduit; 20. a gas turbine; 21. a fuel conduit; 22. a flue gas duct; 30. a waste heat boiler; 40. a steam turbine; 41. a condenser; 42. a water supply pipe; 43. a steam line; 44. a condensate pump; 51. an indirect cooling pipeline; 52. an indirect cooling pump; 53. a middle heat exchanger of the coal press; 54. a boiler feed water heat exchanger; 55. an inter-cold heat cooler; 60. a surface cooler group; 61. an air duct; 70. an absorption refrigerator; 71. a refrigerator generator; 72. a refrigerator evaporator; 73. a chilled water pump; 74. a chilled water pipe; 80. a cooling water pipeline.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
As shown in fig. 1, an embodiment of the present invention provides a system for optimizing cold and heat between coal press rooms of a combined cycle unit with low calorific value, which includes 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 communicated through a water supply pipeline 42 in sequence; meanwhile, the system for optimally utilizing the cold and heat of the coal press room of the low-heat-value combined cycle unit further comprises a room cold and heat system, wherein the room cold and heat system comprises a room cold pipeline 51, a room cold heat exchange medium circulating in the room cold pipeline 51, a room cold pump 52 arranged on the room cold pipeline, a coal press middle heat exchanger 53 and a boiler feed water heat exchanger 54, and the hot side of the coal press middle heat exchanger 53 is communicated with the hot side of the boiler feed water heat exchanger 54 at the cold side through the room cold pipeline 51; the coal gas compressor 10 comprises a coal press high-pressure section 11 and a coal press low-pressure section 12, an indirect cooling fuel pipeline 13 is connected between a fuel outlet of the coal press low-pressure section 12 and a fuel inlet of the coal press high-pressure section 11, and the indirect cooling fuel pipeline 13 is communicated with the hot side of a coal press intermediate heat exchanger 53; a feed water pipe 42 connected between the condenser 41 and the exhaust heat boiler 30 communicates with the cold side of the boiler feed water heat exchanger 54.
When the unit normally operates, the gas compressor 10 works, the low-pressure section 12 of the coal press pressurizes fuel with low calorific value, and the fuel enters the high-pressure section 11 of the coal press through an indirect cooling fuel pipeline 13. The temperature of the fuel passing through the indirect cooling fuel pipeline 13 is high, and the fuel passes through the intermediate heat exchanger 53 of the coal press to exchange heat with indirect cooling heat exchange medium, so that the high-temperature and high-pressure coal gas is cooled, and meanwhile, the temperature of the indirect cooling heat exchange medium is increased after passing through the intermediate heat exchanger 53 of the coal press. The gas compressor 10 supplies fuel to the gas turbine 20 through a fuel line 21, the gas turbine 20 supplies flue gas to the heat recovery steam generator 30 through a flue gas line 22, the heat recovery steam generator 30 supplies steam to the steam turbine 40 through a steam line 43, the steam turbine 40 outputs electric power by applying work, and a cycle is formed by a condenser 41 and a water supply line 42. Further, at the intermediate heat exchanger 53 of the coal press, the intercooling heat transfer medium with the increased temperature enters the hot side of the boiler feed water heat exchanger 54 through the intercooling pipe 51, and exchanges heat with the condensed water (i.e., the boiler feed water) passing through the cold side of the boiler feed water heat exchanger 54, so that the temperature of the boiler feed water circulating into the waste heat boiler 30 is increased. This not only make full use of cold and heat between, simultaneously, the rising of the boiler feed water temperature that flows into exhaust-heat boiler 30 makes boiler exhaust gas temperature rise, effectively prevents the corruption of afterbody heat transfer surface, need not to reduce exhaust-heat boiler 30 low pressure part heat transfer area promptly for the unit can produce more steam, improves combined cycle unit output and thermal efficiency.
As shown in fig. 1, the inter-cooling heat 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 duct 61, and the inter-cooling duct 51 connected to an outlet side of the intermediate heat exchanger 53 of the coal press is also communicated with the surface cooler group 60. The outlet side of the surface cooler group 60 is also connected with the inlet side of the coal press intermediate heat exchanger 53 through an indirect cooling pipeline 51 to form a circulation.
When the combined cycle unit operates at partial load, the inlet guide vane of the gas turbine 20 is turned down, the through-flow capacity of the gas turbine is reduced, and the efficiency of the gas turbine 20 and the combined cycle unit is reduced. At this time, the intercooling heat transfer medium having an increased temperature and passing through the coal press intermediate heat exchanger 53 is introduced into the surface cooler group 60 through the intercooling duct 51, and heats the air introduced into the gas turbine 20. Under the limited load, the load rate of the combustion engine can be improved 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 not changed.
As shown in fig. 1, the inter-cold heat system further includes an absorption refrigeration system, the absorption refrigeration system includes an absorption refrigerator 70, a chilled water pipe 74 and a chilled water pump 73 disposed on the chilled water pipe 74, the absorption refrigerator 70 includes a refrigerator generator 71 and a refrigerator evaporator 72 connected to each other, the inter-cold pipeline 51 connected to the outlet side of the coal press intermediate 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.
The output of the combined cycle unit is reduced along with the rise of the environmental temperature, and the output of the combined cycle unit can be improved by artificially reducing the inlet air temperature of the gas compressor of the gas turbine under the high-temperature working condition. At this time, the intermediate cooling heat transfer medium having an increased temperature is introduced into the generator of the absorption refrigerator 70 by blocking the intermediate cooling duct 51 in which the intermediate cooling heat transfer medium having an increased temperature enters the front surface cooler group 60 via the coal press intermediate heat exchanger 53, and the absorption refrigerator is 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 unit 60 is cooled in the surface cooler unit 60, so that the output force 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 system for optimizing and utilizing the cold and heat between the coal presses of the combined cycle unit with the low calorific value further comprises a cooling system, wherein the cooling system comprises a cooling water pipeline 80 and a cold and heat cooler 55, an indirect cooling pipeline 51 connected between a boiler feed water heat exchanger 54 and the inlet side of the intermediate heat exchanger 53 of the coal press, the indirect cooling pipeline 51 connected between the outlet side of the surface cooler group 60 and the inlet side of the intermediate heat exchanger 53 of the coal press, the indirect cooling pipeline 51 connected between the outlet side of the refrigerator generator 71 and the inlet side of the intermediate heat exchanger 53 of the coal press are communicated with the hot side of the cold and heat cooler 55, and the cold side of the cold and heat cooler 55 is communicated with the cooling water pipeline 80. The indirect cooling heat exchange medium released by the boiler feed water heat exchanger 54, the indirect cooling heat exchange medium released by the surface cooler unit 60 and the indirect cooling heat exchange medium released by the refrigerator generator 71 are fully released in the indirect cooling heat cooler 55, are further cooled and cooled, enter the cold side of the coal press indirect heat exchanger 53 through the indirect cooling pipeline 51 to absorb heat, cool the high-temperature high-pressure coal gas in the indirect cooling fuel pipeline 13, and form the circulation of the indirect cooling heat exchange medium in the indirect cooling pipeline, so that the indirect cooling heat exchange medium can be recycled, and the stability of the indirect cooling system is also improved. As shown in fig. 1, the cooling medium flowing through the cooling water pipe 80 is open water. The indirect cooling heat transfer medium flowing through the indirect cooling pipe 51 is closed water. An open water system and a closed water system are generally arranged in a common combined unit, and a 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 indirect cooling pipelines 51, and heat exchangers are added to serve as a coal press intermediate heat exchanger 53 and a boiler feed water heat exchanger 54; meanwhile, the inter-cold heat cooler 55 can directly adopt a closed water-open water heat exchanger of the original combined unit, which greatly reduces the workload of the inter-cold heat system and the cooling system during engineering.
As shown in fig. 2, another embodiment of the present invention provides a system for optimizing the utilization of cold and heat between coal press rooms of a combined cycle unit with low heat value, which includes 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 communicated through a water supply pipeline 42 in sequence; the system also comprises an inter-cold heat system, wherein the inter-cold heat system comprises a coal press intermediate heat exchanger 53; the coal gas compressor 10 comprises a coal press high-pressure section 11 and a coal press low-pressure section 12, an indirect cooling fuel pipeline 13 is connected between a fuel outlet of the coal press low-pressure section 12 and a fuel inlet of the coal press high-pressure section 11, and the indirect cooling fuel pipeline 13 is communicated with the hot side of a coal press intermediate heat exchanger 53; a water feed line 42 connected between the condenser 41 and the waste heat boiler 30 communicates with the cold side of the coal press intermediate heat exchanger 53.
The present embodiment is different from the previous embodiment in that the condenser 41 and the water feed pipe 42 of the waste heat boiler 30 are directly communicated with the cold side of the coal press intermediate heat exchanger 53, and the coal press intermediate heat exchanger 53 directly heats the boiler feed water. The water supply temperature of the boiler can be improved, and the cold and heat of the room are fully utilized; the exhaust gas temperature of the boiler is improved, the corrosion of the heat exchange surface at the tail part 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 the unit can generate more steam, and the output and the heat efficiency of the combined cycle unit are improved.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A system for optimally utilizing cold and heat between coal press rooms 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), 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 a 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 pipeline (51), indirect cooling heat exchange media 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), wherein 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 coal gas compressor (10) comprises a coal press high-pressure section (11) and a coal press low-pressure section (12), an indirect cooling fuel pipeline (13) is connected between a fuel outlet of the coal press low-pressure section (12) and a fuel inlet of the coal press high-pressure section (11), and the indirect cooling fuel pipeline (13) is communicated with the hot side of the coal press intermediate heat exchanger (53);
and 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 system for optimizing cold and heat between coal presses of a low heating value combined cycle unit according to claim 1, wherein the cold and heat system further comprises a surface cooler group (60), 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 an outlet side of the intermediate heat exchanger (53) of the coal press is further communicated with the surface cooler group (60).
3. The system for optimizing cold and heat utilization of the coal press room of the combined cycle unit with low heating value as claimed in claim 1, wherein the cold and heat system of the room further comprises a surface cooler group (60), the surface cooler group (60) is communicated with the air inlet of the gas turbine (20) through an air pipeline (61); the inter-cold heat quantity system further comprises an absorption refrigeration system, the absorption refrigeration system comprises an absorption refrigerator (70), a freezing water pipe (74) and a freezing water pump (73) arranged on the freezing water pipe (74), the absorption refrigerator (70) comprises a refrigerator generator (71) and a refrigerator evaporator (72) which are connected, an inter-cold pipeline (51) connected with the outlet side of the coal press intermediate 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 freezing water pipe (74).
4. The system for optimizing and utilizing the cold and heat of the coal press room of the combined cycle unit with the low heating value as claimed in claim 1, characterized by further comprising a cooling system, wherein the cooling system comprises a cooling water pipeline (80) and a room cold and heat cooler (55), the room cold pipeline (51) connected between the boiler feed water heat exchanger (54) and the coal press middle heat exchanger (53) is communicated with the hot side of the room cold and heat cooler (55), and the cold side of the room cold and heat cooler (55) is communicated with the cooling water pipeline (80).
5. The system for optimizing and utilizing the cold and heat of the coal press room of the combined cycle unit with the low heating value as claimed in claim 4, wherein the cooling medium circulating in the cooling water pipeline (80) is open water.
6. The system for optimizing and utilizing the cold and heat of the coal press room of the combined cycle unit with the low heating value as claimed in claim 1, wherein the indirect cooling heat exchange medium is closed water.
7. A system for optimally utilizing cold and heat between coal press rooms 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), 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 a room cold and heat system, wherein the room cold and heat system comprises a coal press middle heat exchanger (53); the coal gas compressor (10) comprises a coal press high-pressure section (11) and a coal press low-pressure section (12), an indirect cooling fuel pipeline (13) is connected between a fuel outlet of the coal press low-pressure section (12) and a fuel inlet of the coal press high-pressure section (11), and the indirect cooling fuel pipeline (13) is communicated with the hot side of the coal press intermediate heat exchanger (53); and 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).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023240178.3U CN213980964U (en) | 2020-12-29 | 2020-12-29 | Cold and heat quantity optimal utilization system between coal press of low-heat-value combined cycle unit |
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| CN202023240178.3U CN213980964U (en) | 2020-12-29 | 2020-12-29 | Cold and heat quantity optimal utilization system between coal press of low-heat-value combined cycle unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576375A (en) * | 2020-12-29 | 2021-03-30 | 上海电气燃气轮机有限公司 | Cold and heat utilization system and method for coal press room of low-heat-value combined cycle unit |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112576375A (en) * | 2020-12-29 | 2021-03-30 | 上海电气燃气轮机有限公司 | Cold and heat utilization system and method for coal press room of low-heat-value combined cycle unit |
| CN112576375B (en) * | 2020-12-29 | 2023-09-22 | 上海电气燃气轮机有限公司 | System and method for utilizing cold and heat quantity between coal presses of low-heat-value combined cycle unit |
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