CN212566458U - Circulating cooling water system for gas-steam combined cycle power plant - Google Patents
Circulating cooling water system for gas-steam combined cycle power plant Download PDFInfo
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- CN212566458U CN212566458U CN202022054465.9U CN202022054465U CN212566458U CN 212566458 U CN212566458 U CN 212566458U CN 202022054465 U CN202022054465 U CN 202022054465U CN 212566458 U CN212566458 U CN 212566458U
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Abstract
A circulating cooling water system for a gas-steam combined cycle power plant mainly comprises a water-cooling closed water system of a steam turbine waste heat boiler and an air-cooling closed water system of a gas turbine; the water-cooling closed water system of the steam turbine waste heat boiler mainly comprises a pressure stabilizing water tank, a closed circulating cooling water pump and a tubular heat exchanger, wherein the water inlet end of the circulating cooling water pump is connected with the pressure stabilizing water tank through a pipeline, the water outlet end of the circulating cooling water pump is sequentially provided with a check valve and a second electric isolating valve, and the water outlet end of the second electric isolating valve is respectively connected with the water inlet of the tubular heat exchanger through a confluence pipeline; the water outlet of the tubular heat exchanger is connected with a water supply main pipe through a pipeline, and the water supply main pipe is respectively connected with a water supply main pipe of the steam turbine waste heat boiler and a water supply main pipe of the gas turbine; the steam turbine waste heat boiler water supply main pipe is respectively connected with a steam turbine cooling water user and a waste heat boiler cooling water user pipeline, and the gas turbine water supply main pipe is connected with the gas turbine air cooling closed water system pipeline through a valve.
Description
Technical Field
The utility model relates to a gas-steam combined cycle power plant designs technical field, concretely relates to a recirculated cooling water system for gas-steam combined cycle power plant.
Background
The auxiliary cooling water system is an auxiliary system device which provides cooling water for the gas turbine generator set, the steam turbine generator set, the waste heat boiler and auxiliary equipment thereof so as to ensure the normal operation of the gas turbine generator set, the steam turbine generator set, the waste heat boiler and the auxiliary equipment thereof. The cold source of the closed circulating cooling water system can be from air or water, and for a power plant with more convenient water resources, the closed circulating water is cooled by multipurpose open circulating cooling water; for the thermal power plant in the area lacking of water resources, the closed circulating cooling water can also be cooled by an air cooling tower, and the air cooling tower of the closed water generally adopts a fin fan cooler.
In foreign countries with short electric power demand, a bypass chimney is generally arranged in a gas-steam circulation power plant, and under the condition that a waste heat boiler and a steam turbine generator set are not built, the gas turbine generator set can run in a single circulation mode through the bypass chimney to supply power to the outside in advance, relieve the electric power demand, and then put into operation and jointly circulate after the whole plant is built. At present, for a gas-steam combined cycle power plant which is put into operation separately in a single cycle and a combined cycle, a gas turbine generator set, a steam turbine generator set, a waste heat boiler and auxiliary equipment thereof commonly adopt a set of common closed cycle cooling water system, and the closed cycle cooling water system is required to be built and put into operation when the gas turbine generator set is put into operation in a single cycle, and meanwhile, the open cycle cooling water system is required to be built and put into operation, namely, hydraulic facilities such as a water intake of the power plant, a circulating water pump room and the like are required to be completed. This presents significant risks and challenges to the design and construction cycle of single cycle, pre-commissioned gas-steam combined cycle power plants.
Disclosure of Invention
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a can effectively solve the problem of the required closed cooling water system of gas-steam combined cycle power plant single cycle and combined cycle separately put into operation, improve the recirculated cooling water system that is used for gas-steam combined cycle power plant of closed cooling water system operation flexibility.
The utility model aims to solve the technical scheme that a circulating cooling water system for a gas-steam combined cycle power plant mainly comprises a water-cooled closed water system of a steam turbine waste heat boiler and a gas turbine air-cooled closed water system which is connected with the water-cooled closed water system of the steam turbine waste heat boiler through a pipeline; the water-cooling closed water system of the steam turbine waste heat boiler mainly comprises a pressure stabilizing water tank, at least two closed circulating cooling water pumps connected in parallel and tubular heat exchangers corresponding to the closed circulating cooling water pumps in number, wherein the water inlet ends of the circulating cooling water pumps are respectively connected with the pressure stabilizing water tank through pipelines provided with first electric isolation valves, the water outlet ends of the circulating cooling water pumps are sequentially provided with check valves and second electric isolation valves, and the water outlet ends of the second electric isolation valves are respectively connected with the water inlets of the tubular heat exchangers through confluence pipelines; the water outlet of the tubular heat exchanger is connected with a water supply main pipe through a pipeline, electric isolation valves are respectively arranged on a water inlet pipeline and a water outlet pipeline of the tubular heat exchanger, and the water supply main pipe is respectively connected with a water supply main pipe of a steam turbine waste heat boiler and a water supply main pipe of a gas turbine; the water supply main pipe of the steam turbine waste heat boiler is respectively connected with a steam turbine cooling water user and a waste heat boiler cooling water user pipeline, and the water supply main pipe of the gas turbine is connected with the pipeline of the gas turbine air cooling closed water system through a valve; the water outlet ends of the steam turbine cooling water user and the waste heat boiler cooling water user are connected with a water inlet end pipeline of the first electric isolating valve through a water return main pipe, and the water inlet end of the first electric isolating valve is connected with the water supply main pipe through a pipeline provided with an adjusting valve.
Further, the gas turbine air-cooling closed water system comprises a first-stage gas turbine air-cooling closed water system and a second-stage gas turbine air-cooling closed water system which are arranged in parallel, and the first-stage gas turbine air-cooling closed water system and the second-stage gas turbine air-cooling closed water system are respectively connected with a gas turbine water supply main pipe of the steam turbine waste heat boiler water-cooling closed water system through a switching valve.
Furthermore, the primary combustion engine air-cooling closed water system and the secondary combustion engine air-cooling closed water system respectively comprise combustion engine cooling water users, expansion diaphragm water tanks, water pump systems and fin fan coolers, wherein the water inlet ends of the combustion engine cooling water users are connected with the water outlet ends of the switching valves through water supply branch pipes, the water outlet ends of the combustion engine cooling water users are connected with inlets of the fin fan coolers through water outlet branch pipes, the water supply branch pipes are provided with manual valves, and the water outlet branch pipes are provided with manual valves and electric isolation valves; the outlet of the fin fan cooler is connected with a water supply branch pipe of the gas turbine cooling water user through a water pump system, and a third electric isolation valve is arranged on a connecting pipeline of the water pump system and the water supply branch pipe; the expansion diaphragm water tank is connected with an outlet pipeline of the fin fan cooler.
Furthermore, the water pump system mainly comprises a first water pump branch and a second water pump branch which are arranged in parallel on a pipeline between the fin fan cooler and the third electric isolating valve, the first water pump branch and the second water pump branch both comprise an air-cooling closed water pump and a check valve which are sequentially arranged, and electric isolating valves are respectively arranged on pipelines at the inlet end of the air-cooling closed water pump and the outlet end of the check valve; and the outlet pipeline of the fin fan cooler is connected with the third electric isolating valve through a third branch provided with a regulating valve.
Furthermore, the outlet end of the manual valve on the water outlet branch pipe is connected with a gas turbine water return main pipe through a water return branch pipe, the gas turbine water return main pipe is connected with a water return main pipe of a water-cooling closed water system of the steam turbine waste heat boiler, and a switching valve is arranged on the water return branch pipe.
Furthermore, a pressure stabilizing water tank in the water-cooling closed water system of the steam turbine waste heat boiler is a closed cooling water expansion water tank arranged at a high position and used for adjusting the fluctuation of flow in the system and the thermal expansion of absorbed water, and the pressure of a return water main pipe is ensured.
Furthermore, the expansion diaphragm water tank is a gas diaphragm type expansion water tank which takes inert gas as a pressure stabilizing source and is used for adjusting flow fluctuation in a system and absorbing thermal expansion of water, and pressure of a return water main pipe is ensured.
The utility model has the advantages of: the utility model not only sets the closed water system of the fin fan for simple circulation of the gas turbine, but also sets the closed water system of the open water cooling for the combined circulation of the whole plant, and connects the closed water system of the fin fan cooling and the closed water system of the open water cooling together through the bypass pipeline and the control valve, thereby realizing the switching between the closed water system of the fin fan cooling and the closed water system of the open water cooling; the air cooling system of the fin fan cooler is used for supplying simple circulating cooling water to the gas turbine, the single-cycle production period is effectively shortened, cooling water of the whole plant is supplied through a water-cooling closed circulating cooling water system with a better cooling effect during combined circulation, the problem that the closed cooling water systems required by single circulation and combined circulation of a gas-steam combined circulating power plant are separately put into operation is effectively solved, and the operation flexibility of the closed cooling water systems is improved.
Drawings
Fig. 1 is a schematic view of the overall structure of 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.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "lateral", "vertical", and the like are the directions or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1, the circulating cooling water system for a gas-steam combined cycle power plant of the present invention mainly comprises a steam turbine waste heat boiler water-cooled closed water system 1 and a gas turbine air-cooled closed water system 2 connected to the steam turbine waste heat boiler water-cooled closed water system 1 through a pipeline; the water-cooled closed water system 1 of the steam turbine waste heat boiler mainly comprises a pressure stabilizing water tank 101, at least two closed circulating cooling water pumps 102 connected in parallel and tubular heat exchangers 103 corresponding to the closed circulating cooling water pumps 102 in number, wherein the water inlet ends of the circulating cooling water pumps 102 are respectively connected with the pressure stabilizing water tank 101 through pipelines provided with first electric isolation valves 104, the water outlet ends of the circulating cooling water pumps 102 are sequentially provided with check valves 3 and second electric isolation valves 105, and the water outlet ends of the second electric isolation valves 105 are respectively connected with water inlets 107 of the tubular heat exchangers 103 through confluence pipelines; a water outlet 108 of the tubular heat exchanger 103 is connected with a water supply main pipe 106 through a pipeline, electric isolation valves 4 are respectively arranged on a water inlet 107 and a water outlet 108 of the tubular heat exchanger 103, and the water supply main pipe 106 is respectively connected with a water supply main pipe 109 of a steam turbine waste heat boiler and a water supply main pipe 110 of a combustion engine; the steam turbine waste heat boiler water supply main pipe 109 is respectively connected with a steam turbine cooling water user 111 and a waste heat boiler cooling water user 112 through pipelines, and the gas turbine water supply main pipe 110 is connected with the gas turbine air cooling closed water system 2 through a valve; the water outlet ends of the steam turbine cooling water users 111 and the exhaust-heat boiler cooling water users 112 are connected with a water inlet end pipeline of the first electric isolating valve 104 through a water return main pipe 113, and the water inlet end of the first electric isolating valve 104 is connected with the water supply main pipe 106 through a pipeline provided with an adjusting valve 5.
Referring to fig. 1, the gas turbine air-cooling closed water system 2 includes a first-stage gas turbine air-cooling closed water system 21 and a second-stage gas turbine air-cooling closed water system 22 which are arranged in parallel, and the first-stage gas turbine air-cooling closed water system 21 and the second-stage gas turbine air-cooling closed water system 22 are respectively connected with a gas turbine water supply main pipe 110 of the gas turbine waste heat boiler water-cooling closed water system 1 through a switching valve 6.
Referring to fig. 1, each of the primary combustion engine air-cooling closed water system 21 and the secondary combustion engine air-cooling closed water system 22 comprises a combustion engine cooling water user 201, an expansion diaphragm water tank 202, a water pump system and a fin fan cooler 203, wherein a water inlet end of the combustion engine cooling water user 201 is connected with a water outlet end of a switching valve 6 through a water supply branch pipe 204, the water outlet end of the combustion engine cooling water user 201 is connected with an inlet of the fin fan cooler 203 through a water outlet branch pipe 205, a manual valve 7 is arranged on the water supply branch pipe 204, and a manual valve 7 and an electric isolating valve 4 are arranged on the water outlet branch pipe 205; the outlet of the fin fan cooler 203 is connected with a water supply branch pipe 204 of the cooling water user 201 of the combustion engine through a water pump system, and a third electric isolation valve 206 is arranged on a connecting pipeline of the water pump system and the water supply branch pipe 204; the expansion diaphragm water tank 202 is connected with an outlet pipeline of a fin fan cooler 203; the outlet end of the manual valve 7 on the water outlet branch pipe 205 is connected with a gas turbine water return main pipe 208 through a water return branch pipe 207, the gas turbine water return main pipe 208 is connected with a water return main pipe 113 of the steam turbine waste heat boiler water-cooling closed water system 1, and the water return branch pipe 207 is provided with a switching valve 6.
Referring to fig. 1, the water pump system mainly includes a first water pump branch 209 and a second water pump branch 210 which are arranged in parallel on a pipeline between the fin fan cooler 203 and the third electric isolation valve 206, the first water pump branch 209 and the second water pump branch 210 both include an air-cooling closed water pump 211 and a check valve 3 which are arranged in sequence, and electric isolation valves 4 are respectively arranged on pipelines at an inlet end of the air-cooling closed water pump 211 and at an outlet end of the check valve 3; the outlet pipe of the fin fan cooler 203 is connected with the third electric isolation valve 206 through a third branch 212 provided with a regulating valve 5.
The pressure stabilizing water tank 101 in the water-cooling closed water system 1 of the steam turbine waste heat boiler is a closed cooling water expansion water tank arranged at a high position and used for adjusting the fluctuation of flow in the system and absorbing the thermal expansion of water so as to ensure the pressure of a return water main pipe; the expansion diaphragm water tank 202 is a gas diaphragm type expansion water tank which takes inert gas as a pressure stabilizing source and is used for adjusting flow fluctuation in a system and absorbing thermal expansion of water so as to ensure pressure of a return water main pipe.
Example (b): recirculating cooling water system constitute by steam turbine exhaust-heat boiler water-cooling closed water system, gas turbine air cooling closed water system, two cooling system can independently separately move, also can the joint operation.
Simple circulating cooling water circulation: when the gas turbine generator set is built for production and operates in a single cycle, the finned fan air cooling system supplies cooling water to the gas turbine generator set. The switching valve 6 communicated with the water-cooling closed water system 1 of the steam turbine waste heat boiler and the air-cooling closed water system 2 of the combustion engine is closed, the third electric isolation valve 206 is opened, the air-cooling closed water pump 211 is opened, cooling water is sent to each cooling water user of the combustion engine after being boosted by the air-cooling closed water pump 211, and then is cooled by the fin fan cooler 203 and then returns to the inlet of the air-cooling closed water pump 211. The inlet pipeline of the air-cooling closed water pump 211 is stabilized by the diaphragm water tank 202.
And (3) combined cycle cooling water circulation: when the steam turbine generator unit, the waste heat boiler and the hydraulic cooling water facility are built and put into operation and the combined cycle unit is operated, the combined cycle closed cycle cooling water system uniformly supplies closed cycle cooling water to the steam turbine generator unit, the waste heat boiler and the gas turbine generator unit. The third electric isolation valve 206 is closed, the air-cooled closed cooling water pump 211 is closed, the switching valve 6 is opened,
the closed cooling water pump 102 is started; after the pressure of cooling water is increased by a closed cooling water pump 102, the cooling water is firstly cooled by a tubular heat exchanger 103, and then is divided into two paths by a closed circulating cooling water supply main pipe 106, wherein one path is sent to a steam turbine room and a waste heat boiler cooling water user through a steam turbine waste heat boiler water supply main pipe 109, and the other path is sent to a gas turbine generator cooling water user through a gas turbine water supply main pipe 110, a gas turbine water supply branch pipe 204 and a manual valve; the return water of the cooling water from the cooling water user of the gas turbine sequentially passes through the manual valve, the return water branch pipe 207 of the gas turbine and the return water main pipe 208 of the gas turbine, then is combined with the return water of the steam turbine user and the waste heat boiler user into the return water main pipe 113, and then returns back to the inlet of the closed water pump 102. The inlet pipeline of the closed water pump 102 is provided with an expansion water tank 101 for stabilizing pressure.
Under the whole plant power loss emergency shutdown working condition: under the condition of emergency shutdown of the power loss unit in the whole plant, the heat exchanger 103 of the combined cycle closed cooling water system loses the cooling water supply of the hydraulic facilities, and at the moment, the combustion engine and the steam turbine still need cooling water to be supplied to the lubricating oil cooler of the combustion engine and the lubricating oil cooler of the steam turbine under the condition of trip so as to be safely shut down. An air-cooled closed cooling water pump 211 is connected to a security power supply to supply lubricating oil cooling water required by the emergency stop of the combustion engine and the steam turbine. At the moment, an inlet electric isolating valve and an outlet electric isolating valve of the closed water heat exchanger 103 are closed, a switching valve 6 is opened, an electric isolating valve 4 at the inlet ends of a third electric isolating valve 206 and a fin fan cooler 203 is opened, an air-cooling closed pump 211 connected with a security power supply is opened, cooling water is boosted by the air-cooling closed pump 211, one path of the cooling water is sent to a lubricating oil cooler of a gas turbine user through a manual valve 7 of a water supply branch pipe 204, and the other path of the cooling water is sent to the lubricating oil cooler of the gas turbine user through the switching valve 6 at a gas turbine water supply main pipe 110, the gas turbine water supply main pipe 110 and a gas turbine waste heat boiler water supply; after passing through the gas turbine engine lubricating oil cooler return water main pipe 208 and the switching valve 6 at the gas turbine engine return water main pipe 208, the cooling water from the gas turbine engine lubricating oil cooler and the cooling water from the gas turbine engine lubricating oil cooler are combined and pass through the electric isolating valve 4 at the inlet end of the fin fan cooler 203, then enter the fin type air cooler 203, are cooled and then return to the inlet of the air cooling closed pump 211, and the inlet pipeline of the air cooling closed pump 211 is stabilized by the diaphragm water tank 202.
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 (7)
1. A recirculating cooling water system for gas-steam combined cycle power plant which characterized in that: the system mainly comprises a water-cooling closed water system of the steam turbine waste heat boiler and a gas turbine air-cooling closed water system connected with a pipeline of the water-cooling closed water system of the steam turbine waste heat boiler; the water-cooling closed water system of the steam turbine waste heat boiler mainly comprises a pressure stabilizing water tank, at least two closed circulating cooling water pumps connected in parallel and tubular heat exchangers corresponding to the closed circulating cooling water pumps in number, wherein the water inlet ends of the circulating cooling water pumps are respectively connected with the pressure stabilizing water tank through pipelines provided with first electric isolation valves, the water outlet ends of the circulating cooling water pumps are sequentially provided with check valves and second electric isolation valves, and the water outlet ends of the second electric isolation valves are respectively connected with the water inlets of the tubular heat exchangers through confluence pipelines; the water outlet of the tubular heat exchanger is connected with a water supply main pipe through a pipeline, electric isolation valves are respectively arranged on a water inlet pipeline and a water outlet pipeline of the tubular heat exchanger, and the water supply main pipe is respectively connected with a water supply main pipe of a steam turbine waste heat boiler and a water supply main pipe of a gas turbine; the water supply main pipe of the steam turbine waste heat boiler is respectively connected with a steam turbine cooling water user and a waste heat boiler cooling water user pipeline, and the water supply main pipe of the gas turbine is connected with the pipeline of the gas turbine air cooling closed water system through a valve; the water outlet ends of the steam turbine cooling water user and the waste heat boiler cooling water user are connected with a water inlet end pipeline of the first electric isolating valve through a water return main pipe, and the water inlet end of the first electric isolating valve is connected with the water supply main pipe through a pipeline provided with an adjusting valve.
2. The recirculating cooling water system of claim 1, wherein: the gas turbine air cooling closed water system comprises a first-stage gas turbine air cooling closed water system and a second-stage gas turbine air cooling closed water system which are arranged in parallel, and the first-stage gas turbine air cooling closed water system and the second-stage gas turbine air cooling closed water system are respectively connected with a gas turbine water supply main pipe of the steam turbine waste heat boiler water cooling closed water system through a switching valve.
3. The recirculating cooling water system of claim 2, wherein: the primary gas turbine air-cooling closed water system and the secondary gas turbine air-cooling closed water system respectively comprise gas turbine cooling water users, expansion diaphragm water tanks, water pump systems and fin fan coolers, wherein the water inlet ends of the gas turbine cooling water users are connected with the water outlet ends of the switching valves through water supply branch pipes, the water outlet ends of the gas turbine cooling water users are connected with inlets of the fin fan coolers through the water outlet branch pipes, the water supply branch pipes are provided with manual valves, and the water outlet branch pipes are provided with manual valves and electric isolation valves; the outlet of the fin fan cooler is connected with a water supply branch pipe of the gas turbine cooling water user through a water pump system, and a third electric isolation valve is arranged on a connecting pipeline of the water pump system and the water supply branch pipe; the expansion diaphragm water tank is connected with an outlet pipeline of the fin fan cooler.
4. The recirculating cooling water system of claim 3, wherein: the water pump system mainly comprises a first water pump branch and a second water pump branch which are arranged on a pipeline between the fin fan cooler and a third electric isolating valve in parallel, the first water pump branch and the second water pump branch both comprise an air-cooling closed water pump and a check valve which are sequentially arranged, and the pipelines at the inlet end of the air-cooling closed water pump and the outlet end of the check valve are respectively provided with the electric isolating valve; and the outlet pipeline of the fin fan cooler is connected with the third electric isolating valve through a third branch provided with a regulating valve.
5. The circulating cooling water system according to claim 3 or 4, wherein: the outlet end of the manual valve on the water outlet branch pipe is connected with a gas turbine backwater main pipe through a backwater branch pipe, the gas turbine backwater main pipe is connected with a backwater main pipe of a water-cooling closed water system of the steam turbine waste heat boiler, and a switching valve is arranged on the backwater branch pipe.
6. The recirculating cooling water system of claim 5, wherein: a pressure stabilizing water tank in the water-cooling closed water system of the steam turbine waste heat boiler is a closed cooling water expansion water tank arranged at a high position and used for adjusting the fluctuation of flow in the system and absorbing the thermal expansion of water, and the pressure of a return water main pipe is ensured.
7. The recirculating cooling water system of claim 5, wherein: the expansion diaphragm water tank is a gas diaphragm type expansion water tank which takes inert gas as a pressure stabilizing source and is used for adjusting the fluctuation of flow in the system and absorbing the thermal expansion of water so as to ensure the pressure of a backwater main pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022054465.9U CN212566458U (en) | 2020-09-18 | 2020-09-18 | Circulating cooling water system for gas-steam combined cycle power plant |
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| CN202022054465.9U CN212566458U (en) | 2020-09-18 | 2020-09-18 | Circulating cooling water system for gas-steam combined cycle power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947384A (en) * | 2020-09-18 | 2020-11-17 | 中国能源建设集团浙江省电力设计院有限公司 | Combined closed circulating cooling water system for gas-steam combined cycle power plant |
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2020
- 2020-09-18 CN CN202022054465.9U patent/CN212566458U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947384A (en) * | 2020-09-18 | 2020-11-17 | 中国能源建设集团浙江省电力设计院有限公司 | Combined closed circulating cooling water system for gas-steam combined cycle power plant |
| CN111947384B (en) * | 2020-09-18 | 2023-12-01 | 中国能源建设集团浙江省电力设计院有限公司 | Combined closed-cycle cooling water system for gas-steam combined cycle power plant |
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