CN212202149U - Gas-steam combined cycle thermodynamic system with steam extraction heat regeneration - Google Patents
Gas-steam combined cycle thermodynamic system with steam extraction heat regeneration Download PDFInfo
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Abstract
The gas-steam combined cycle thermodynamic system with steam extraction and heat return mainly comprises a generator, a steam turbine and a waste heat boiler, wherein the outlet of a high-pressure steam drum of the waste heat boiler is connected with the inlet of a high-pressure cylinder of the steam turbine through a main steam pipeline, the outlet of a medium-pressure steam drum of the waste heat boiler is connected with the inlet of a medium-pressure cylinder of the steam turbine through a hot reheat steam pipeline, the outlet of a low-pressure steam drum of the waste heat boiler is connected with the inlet of a low-pressure cylinder of the steam turbine through a low-pressure steam pipeline, the outlet of the high-pressure cylinder of the steam turbine is connected with the outlet of the medium-pressure steam drum through a cold reheat steam pipeline; the main steam pipeline is connected with the cold reheat steam pipeline through a first branch provided with a high-pressure bypass valve, the hot reheat steam pipeline is connected with the condenser through a second branch provided with a medium-pressure bypass valve, and the low-pressure steam pipeline is connected with the condenser through a third branch provided with a low-pressure bypass valve.
Description
Technical Field
The utility model belongs to gas-steam combined cycle power generation field, concretely relates to take gas-steam combined cycle thermodynamic system of extraction of steam backheating.
Background
With the progress of science and technology, energy and power supply of countries around the world is developing towards high efficiency and cleanness. Compared with a coal-fired thermal power plant, the fuel-steam combined cycle power plant becomes a preferred unit of a peak shaving power plant, a thermal power plant and even a base load power plant due to the outstanding advantages of small occupied area, high construction speed, short operation starting time, rapid load adjustment, clean combustion and the like. The heat efficiency of the million kilowatt ultra-supercritical coal-fired unit is about 45 percent at present, and the efficiency of the highest-grade H-grade gas-steam combined cycle generator unit can reach 60 percent. Factors affecting the thermal efficiency of a gas-steam combined cycle unit mainly include the thermal efficiency of a gas turbine unit and the thermal efficiency of a steam turbine unit. The single cycle efficiency of the H-stage gas turbine reaches 40%, and after the gas turbine is selected, the thermal efficiency of the combined cycle depends on the efficiency of a thermodynamic system consisting of a waste heat boiler and a steam turbine.
The main factors influencing the steam circulation efficiency of the waste heat boiler and the steam turbine comprise steam inlet parameters of the steam turbine, steam pressure stage number and heat recovery system configuration. According to the difference of gas turbine manufacturers, unit grades and exhaust gas temperatures, in the existing combined cycle power plant thermodynamic system design, steam inlet parameters suitable for the exhaust gas temperature of a gas turbine type are generally adopted by a steam turbine. The steam pressure series can be divided into five types of single-pressure no-reheat, double-pressure reheat, three-pressure no-reheat and three-pressure reheat cycles, and most of the currently-operated high-capacity gas-steam combined cycle power plants with 200MW levels and above adopt a three-pressure reheat system, namely, a waste heat boiler generates high-pressure steam, medium-pressure steam and low-pressure steam. After the high-pressure steam works in the high-pressure cylinder of the steam turbine, the high-pressure steam returns to the waste heat boiler and is combined with the medium-pressure steam to enter a reheater, the reheated steam is formed after reheating and enters the medium-pressure cylinder of the steam turbine to work, the low-pressure steam directly enters the low-pressure cylinder of the steam turbine to work, and exhaust steam enters the condenser. According to the engineering thermodynamic theory, the heat efficiency of the system can be improved by adopting steam extraction heat regeneration in a steam power cycle thermodynamic system, so that the thermodynamic systems of coal-fired thermal power plants all adopt heat regeneration cycle, and steam extraction of a steam turbine is utilized to heat condensed water and feed water. For the waste heat boiler type steam power system of the gas-steam combined cycle unit, a regenerative system configuration for heating condensed water by using extracted steam of a steam turbine is rare.
Meanwhile, for a gas turbine adopting dual fuels (using natural gas and light diesel oil), because light diesel oil generally contains sulfur, the acid dew point of flue gas is higher than that of the flue gas under the working condition of fuel oil, so that the exhaust gas temperature of a waste heat boiler under the working condition of fuel oil is required to be greatly higher than that of the flue gas. Therefore, for the dual-fuel gas-steam combined cycle unit, how to perfect the configuration of the steam cycle thermodynamic system meets the requirements that the exhaust gas temperature under different fuels is higher than the acid dew point and the feed water temperature of condensed water is increased, and the exhaust gas waste heat is utilized as much as possible and the efficiency of the thermodynamic system is increased becomes a new technical problem encountered by the existing dual-fuel gas-steam combined cycle unit.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide one kind and can satisfy the requirement of exhaust gas temperature and feedwater temperature of exhaust-heat boiler under the different fuel condition, can improve the gas-steam combined cycle thermodynamic system of taking out the vapour backheat of combined cycle thermal efficiency again.
The utility model aims to complete the technical proposal that a gas-steam combined cycle thermodynamic system with steam extraction and heat return mainly comprises a generator, a steam turbine and a waste heat boiler, the steam turbine is provided with a steam turbine high pressure cylinder, a steam turbine intermediate pressure cylinder and a steam turbine low pressure cylinder which are mutually connected, the waste heat boiler is provided with a high-pressure steam drum, a medium-pressure steam drum and a low-pressure steam drum, the outlet of the high-pressure steam drum of the waste heat boiler is connected with the inlet of the high-pressure cylinder of the steam turbine through a main steam pipeline, the outlet of the medium-pressure steam drum of the waste heat boiler is connected with the inlet of the medium-pressure cylinder of the steam turbine through a hot reheat steam pipeline, the outlet of the low-pressure steam drum of the waste heat boiler is connected with the inlet of the low-pressure cylinder of the steam turbine through a, the outlet of the high-pressure turbine cylinder is connected with the outlet of the medium-pressure steam drum through a cold reheat steam pipeline, and the outlet of the low-pressure turbine cylinder is connected with the condenser through a pipeline; the main steam pipeline is connected with the cold reheat steam pipeline through a first branch provided with a high-pressure bypass valve, the hot reheat steam pipeline is connected with the condenser through a second branch provided with a medium-pressure bypass valve, and the low-pressure steam pipeline is connected with the condenser through a third branch provided with a low-pressure bypass valve; the condenser is connected with a condensate pump through a pipeline, the condensate pump is connected with an inlet of a low-pressure steam drum through a low-pressure heat recovery system to form a circulation loop, and the low-pressure cylinder of the steam turbine is connected with the low-pressure heat recovery system through a steam extraction pipeline; and the outlet of the low-pressure steam drum is respectively connected with the inlets of the medium-pressure steam drum and the high-pressure steam drum through a water feeding pump.
Further, the low-pressure heat recovery system comprises a primary low-pressure heat recovery system and a secondary low-pressure heat recovery system, the primary low-pressure heat recovery system mainly comprises a first inlet isolation valve, a first low-pressure heater and a first outlet isolation valve which are sequentially connected with the condensate pump, and an inlet of the first inlet isolation valve is connected with an outlet end of the first outlet isolation valve through a first isolation bypass provided with a first bypass isolation valve; the secondary low-pressure regenerative system mainly comprises a second inlet isolation valve, a second low-pressure heater and a second outlet isolation valve which are sequentially connected with a first outlet isolation valve of the primary low-pressure regenerative system from near to far, wherein the inlet of the second inlet isolation valve is connected with the outlet of the second outlet isolation valve through a second isolation bypass provided with a second bypass isolation valve, and the second outlet isolation valve is connected with the inlet of the low-pressure steam drum through a pipeline; the steam extraction pipeline comprises a first steam extraction pipeline connected with the first low-pressure heater and a second steam extraction pipeline connected with the second low-pressure heater, a first steam extraction butterfly valve is arranged on the first steam extraction pipeline, and a steam extraction check valve and a second steam extraction butterfly valve are sequentially arranged on the second steam extraction pipeline.
Furthermore, a first water drainage branch is arranged on the first low-pressure heater, the first water drainage branch comprises a first water drainage pump inlet isolating valve, a first water drainage pump, a first check valve and a first water drainage pump outlet isolating valve which are sequentially connected, an outlet of the first water drainage branch is connected with an outlet end of the first low-pressure heater, and a first water drainage loop connected with the first low-pressure heater is arranged on a pipeline between the first check valve and the first water drainage pump outlet isolating valve through a first regulating valve; the second low pressure heater is provided with a second hydrophobic branch, the second hydrophobic branch comprises a second hydrophobic pump inlet isolating valve, a second hydrophobic pump, a second check valve and a second hydrophobic pump outlet isolating valve which are sequentially connected, the outlet of the second hydrophobic branch is connected with the outlet end of the second low pressure heater, and a second hydrophobic loop connected with the second low pressure heater is arranged on a pipeline between the second check valve and the second hydrophobic pump outlet isolating valve through a second regulating valve.
Further, the first low-pressure heater and the second low-pressure heater are both shell-and-tube heat exchangers.
The utility model has the advantages of: the utility model discloses a diesel oil/natural gas dual fuel's gas-steam combined cycle unit provides a take thermodynamic system that two-stage extraction steam was backheat, according to the nimble switching of two-stage low pressure extraction steam heater, both can improve the combined cycle thermal efficiency of unit, can satisfy the requirement of exhaust gas temperature of exhaust-heat boiler to acid dew point and condensate water feedwater temperature again under the different fuel kind circumstances.
Drawings
Fig. 1 is a schematic diagram of a combined cycle thermodynamic system according to the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples.
As shown in fig. 1, the gas-steam combined cycle thermodynamic system with steam extraction heat recovery of the present invention mainly includes a generator 3, a steam turbine 4 and a waste heat boiler 5, the steam turbine is provided with a steam turbine high pressure cylinder 41, a steam turbine intermediate pressure cylinder 42 and a steam turbine low pressure cylinder 43 which are connected with each other, the waste heat boiler 5 is provided with a high pressure steam drum 51, an intermediate pressure steam drum 52 and a low pressure steam drum 53, an outlet of the high pressure steam drum 51 of the waste heat boiler 5 is connected with an inlet of the steam turbine high pressure cylinder 41 through a main steam pipeline 61, an outlet of the intermediate pressure steam drum 52 of the waste heat boiler is connected with an inlet of the steam turbine intermediate pressure cylinder 42 through a hot reheat steam pipeline 62, an outlet of the low pressure steam drum 53 of the waste heat boiler is connected with an inlet of the steam turbine low pressure cylinder 43 through a low pressure steam pipeline 63, an outlet of the steam turbine high pressure cylinder 41 is connected with an outlet, the outlet of the turbine low-pressure cylinder 43 is connected with the condenser 7 through a pipeline; the main steam pipeline 61 is connected with the cold reheat steam pipeline 64 through a first branch 611 provided with a high pressure bypass valve 81, the hot reheat steam pipeline 62 is connected with the condenser 7 through a second branch 621 provided with an intermediate pressure bypass valve 82, and the low pressure steam pipeline 63 is connected with the condenser 7 through a third branch 631 provided with a low pressure bypass valve 83; the condenser 7 is connected with a condensate pump 9 through a pipeline, the condensate pump 9 is connected with an inlet of the low-pressure steam drum 53 through a low-pressure heat recovery system 100 to form a circulation loop, and the steam turbine low-pressure cylinder 43 is connected with the low-pressure heat recovery system 100 through a steam extraction pipeline; the outlet of the low-pressure steam drum 53 is connected with the inlets of the medium-pressure steam drum 52 and the high-pressure steam drum 51 through a feed water pump.
Referring to fig. 1, the low-pressure regenerative system 100 includes a primary low-pressure regenerative system 1 and a secondary low-pressure regenerative system 2, where the primary low-pressure regenerative system 1 mainly includes a first inlet isolation valve 11, a first low-pressure heater 10, and a first outlet isolation valve 13, which are sequentially connected to the condensate pump 9, and an inlet of the first inlet isolation valve 11 is connected to an outlet of the first outlet isolation valve 13 through a first isolation bypass provided with a first bypass isolation valve 12; the secondary low-pressure regenerative system 2 mainly comprises a second inlet isolation valve 21, a second low-pressure heater 20 and a second outlet isolation valve 23 which are sequentially connected with a first outlet isolation valve 13 of the primary low-pressure regenerative system 1 from near to far, wherein an inlet of the second inlet isolation valve 21 is connected with an outlet of the second outlet isolation valve 23 through a second isolation bypass provided with a second bypass isolation valve 22, and the second outlet isolation valve 23 is connected with an inlet of the low-pressure steam pocket 53 through a pipeline; the steam extraction pipeline comprises a first steam extraction pipeline 65 connected with the first low-pressure heater 10 and a second steam extraction pipeline 66 connected with the second low-pressure heater 20, a first steam extraction butterfly valve 19 is arranged on the first steam extraction pipeline 65, and a steam extraction check valve 201 and a second steam extraction butterfly valve 29 are sequentially arranged on the second steam extraction pipeline 66; the first low-pressure heater 10 and the second low-pressure heater 20 are both shell-and-tube heat exchangers.
Referring to fig. 1, a first water drainage branch 67 is arranged on the first low-pressure heater 10, the first water drainage branch 67 includes a first water drainage pump inlet isolation valve 14, a first water drainage pump 15, a first check valve 16 and a first water drainage pump outlet isolation valve 18 which are sequentially connected in sequence, an outlet of the first water drainage branch 67 is connected with an outlet end of the first low-pressure heater 10, and a first water drainage loop connected with the first low-pressure heater 10 is arranged on a pipeline between the first check valve 16 and the first water drainage pump outlet isolation valve 18 through a first regulating valve 17; be provided with hydrophobic branch road 68 of second on the second low pressure heater 20, hydrophobic branch road 68 of second is including hydrophobic pump entry isolating valve 24 of second, second hydrophobic pump 25, second check valve 26 and the hydrophobic pump export isolating valve 28 of second that connects gradually, the export of the hydrophobic branch road 68 of second is connected with the exit end of second low pressure heater 20, be provided with the hydrophobic return circuit of second of being connected with second low pressure heater 20 through second governing valve 27 on the pipeline between hydrophobic pump export isolating valve 28 of second check valve 26 and second. The first drainage pump 15 sends drainage of first steam extraction of the steam turbine to the condensed water at the outlet of the first low-pressure heater 10, and the second drainage pump 25 sends drainage of second steam extraction of the steam turbine to the condensed water at the outlet of the second low-pressure heater 20; the first regulating valve 17 regulates the amount of hydrophobic water returned to the first low pressure heater 10 according to the hydrophobic liquid level of the first low pressure heater 10, and the second regulating valve 27 regulates the amount of hydrophobic water returned to the second low pressure heater 20 according to the hydrophobic liquid level of the second low pressure heater 20.
Combined cycle thermodynamic system have three kinds of operational modes, first mode is that two-stage low pressure backheat system all operates, second kind of mode is only to operate one-level low pressure backheat system, third kind of mode is that two-stage low pressure backheat system all does not operate. According to the difference of combustion turbine fuel and exhaust-heat boiler exhaust-acid nicotinic acid dew point, the condensate water feedwater temperature that needs is also different, the utility model discloses a three kinds of operational modes of two-stage extraction backheating system as follows:
1) when the fuel of the gas turbine is fuel oil and the acid dew point of the flue gas is higher, a first heat regeneration mode is adopted, namely, the two-stage low-pressure heat regeneration system operates: opening a first inlet isolation valve 11 and a first outlet isolation valve 13, closing a first bypass isolation valve 12, opening a first steam extraction butterfly valve 19, a first drain pump inlet isolation valve 14, a first drain pump 15, a first regulating valve 17 and a first drain pump outlet isolation valve 18, wherein all condensed water passes through a first low-pressure heater 10, primary steam extracted from a steam turbine low-pressure cylinder d passes through the first low-pressure heater 10 and then becomes hydrophobic, the hydrophobic water is pressurized by the first drain pump 15 and then is sent to a condensed water pipeline at the outlet of the first low-pressure heater 10, and the first regulating valve 17 controls the hydrophobic water volume of the condensed water to be sent back according to the liquid level of the first low-pressure heater 10; the second inlet isolation valve 21 and the second outlet isolation valve 23 are opened, the second bypass isolation valve 22 is closed, the steam extraction check valve 201, the second steam extraction butterfly valve 29, the second drain pump inlet isolation valve 24, the second drain pump 25, the second regulating valve 27 and the second drain pump outlet isolation valve 28 are opened, all the condensed water from the first low-pressure heater 10 passes through the second low-pressure heater 20, the secondary steam extraction from the steam turbine low-pressure cylinder d passes through the second low-pressure heater 20 and then becomes hydrophobic, the hydrophobic water is pressurized by the second drain pump 25 and then is sent to a condensed water pipeline at the outlet of the second low-pressure heater 20, and the second regulating valve 27 controls the hydrophobic water amount of the condensed water to be sent back according to the liquid level of the second low-pressure heater 20.
2) When the fuel of the gas turbine is fuel oil or low-sulfur natural gas and the dew point of the flue gas acid is common, a second heat regeneration mode is adopted, and only the first-stage low-pressure heat regeneration system is operated: opening a first inlet 11 isolation valve and a first outlet isolation valve 13, closing a first bypass isolation valve 12, opening a first steam extraction butterfly valve 19, a first drain pump inlet isolation valve 14, a first drain pump 15, a first regulating valve 17 and a first drain pump outlet isolation valve 18, enabling all condensed water to pass through a first low-pressure heater 10, enabling primary steam extracted from a low-pressure cylinder of a steam turbine to pass through the first low-pressure heater 10 and then become hydrophobic, enabling the hydrophobic to be pressurized through the first drain pump 15 and then sent to a condensed water pipeline at the outlet of the first low-pressure heater 10, and enabling the first regulating valve 17 to control the hydrophobic amount of the condensed water to be sent back according to the liquid level of the first low-pressure heater 10; and closing the second inlet isolating valve 21 and the second outlet isolating valve 23, opening the second bypass isolating valve 22, closing the steam extraction check valve 201 and the second steam extraction butterfly valve 29, closing the second drainage pump inlet isolating valve 24, the second drainage pump 25, the second regulating valve 27 and the second drainage pump outlet isolating valve 28, directly bypassing the condensed water from the first low-pressure heater 10 through the second low-pressure heater 20, and stopping the operation of the secondary steam extraction and drainage system.
3) When the fuel of the gas turbine is sulfur-free natural gas and the dew point of the flue gas acid is lower, a third regenerative mode is adopted, namely, the two-stage low-pressure regenerative system does not operate: closing the first inlet isolating valve 11 and the first outlet isolating valve 13, opening the first bypass isolating valve 12, closing the first steam extraction butterfly valve 19, closing the first drain pump inlet isolating valve 14, the first drain pump 15, the first regulating valve 17 and the first drain pump outlet isolating valve 18, directly passing the condensed water from the condensed water pump 9 through the bypass of the first low-pressure heater 10, and stopping the operation of the primary steam extraction and drainage system; and closing the second inlet isolating valve 21 and the second outlet isolating valve 23, opening the second bypass isolating valve 22, closing the steam extraction check valve 20 and the second steam extraction butterfly valve 29, closing the second drainage pump inlet isolating valve 24, the second drainage pump 25, the second regulating valve 27 and the second drainage pump outlet isolating valve 28, directly bypassing the condensed water from the first low-pressure heater 10 through the second low-pressure heater 20, and stopping the operation of the secondary steam extraction and drainage system.
The specific embodiments described herein are merely illustrative of the principles of the present invention and its efficacy, and are not intended to limit 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. Therefore, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical idea of the present invention shall be covered by the claims of the present invention.
Claims (4)
1. The gas-steam combined cycle thermodynamic system with steam extraction heat recovery mainly comprises a generator, a steam turbine and a waste heat boiler, wherein the steam turbine is provided with a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder and a steam turbine low-pressure cylinder which are connected with each other, and the waste heat boiler is provided with a high-pressure steam drum, a medium-pressure steam drum and a low-pressure steam drum, and is characterized in that: an outlet of a high-pressure steam drum of the waste heat boiler is connected with an inlet of a high-pressure cylinder of the steam turbine through a main steam pipeline, an outlet of a medium-pressure steam drum of the waste heat boiler is connected with an inlet of a medium-pressure cylinder of the steam turbine through a hot reheat steam pipeline, an outlet of a low-pressure steam drum of the waste heat boiler is connected with an inlet of a low-pressure cylinder of the steam turbine through a low-pressure steam pipeline, an outlet of the high-pressure cylinder of the steam turbine is connected with an outlet of the medium-pressure steam drum through a cold reheat steam pipeline, and an outlet of the low; the main steam pipeline is connected with the cold reheat steam pipeline through a first branch provided with a high-pressure bypass valve, the hot reheat steam pipeline is connected with the condenser through a second branch provided with a medium-pressure bypass valve, and the low-pressure steam pipeline is connected with the condenser through a third branch provided with a low-pressure bypass valve; the condenser is connected with a condensate pump through a pipeline, the condensate pump is connected with an inlet of a low-pressure steam drum through a low-pressure heat recovery system to form a circulation loop, and the low-pressure cylinder of the steam turbine is connected with the low-pressure heat recovery system through a steam extraction pipeline; and the outlet of the low-pressure steam drum is respectively connected with the inlets of the medium-pressure steam drum and the high-pressure steam drum through a water feeding pump.
2. The gas-steam combined cycle thermodynamic system with regenerative steam extraction of claim 1, wherein: the low-pressure heat recovery system comprises a primary low-pressure heat recovery system and a secondary low-pressure heat recovery system, the primary low-pressure heat recovery system mainly comprises a first inlet isolation valve, a first low-pressure heater and a first outlet isolation valve which are sequentially connected with the condensate pump, and the inlet of the first inlet isolation valve is connected with the outlet end of the first outlet isolation valve through a first isolation bypass provided with a first bypass isolation valve; the secondary low-pressure regenerative system mainly comprises a second inlet isolation valve, a second low-pressure heater and a second outlet isolation valve which are sequentially connected with a first outlet isolation valve of the primary low-pressure regenerative system from near to far, wherein the inlet of the second inlet isolation valve is connected with the outlet of the second outlet isolation valve through a second isolation bypass provided with a second bypass isolation valve, and the second outlet isolation valve is connected with the inlet of the low-pressure steam drum through a pipeline; the steam extraction pipeline comprises a first steam extraction pipeline connected with the first low-pressure heater and a second steam extraction pipeline connected with the second low-pressure heater, a first steam extraction butterfly valve is arranged on the first steam extraction pipeline, and a steam extraction check valve and a second steam extraction butterfly valve are sequentially arranged on the second steam extraction pipeline.
3. The gas-steam combined cycle thermodynamic system with regenerative steam extraction of claim 2, wherein: the first low-pressure heater is provided with a first drainage branch, the first drainage branch comprises a first drainage pump inlet isolating valve, a first drainage pump, a first check valve and a first drainage pump outlet isolating valve which are sequentially connected, an outlet of the first drainage branch is connected with an outlet end of the first low-pressure heater, and a first drainage loop connected with the first low-pressure heater is arranged on a pipeline between the first check valve and the first drainage pump outlet isolating valve through a first regulating valve; the second low pressure heater is provided with a second hydrophobic branch, the second hydrophobic branch comprises a second hydrophobic pump inlet isolating valve, a second hydrophobic pump, a second check valve and a second hydrophobic pump outlet isolating valve which are sequentially connected, the outlet of the second hydrophobic branch is connected with the outlet end of the second low pressure heater, and a second hydrophobic loop connected with the second low pressure heater is arranged on a pipeline between the second check valve and the second hydrophobic pump outlet isolating valve through a second regulating valve.
4. A gas-steam combined cycle thermodynamic system with regenerative steam extraction as claimed in claim 2 or claim 3, wherein: and the first low-pressure heater and the second low-pressure heater are both shell-and-tube heat exchangers.
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|---|---|---|---|---|
| CN113638807A (en) * | 2021-09-15 | 2021-11-12 | 西安热工研究院有限公司 | Heating system and method for bypass auxiliary cylinder cutting of gas-steam combined cycle unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638807A (en) * | 2021-09-15 | 2021-11-12 | 西安热工研究院有限公司 | Heating system and method for bypass auxiliary cylinder cutting of gas-steam combined cycle unit |
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