CN112943456B - Auxiliary engine cooling water system of gas-steam combined cycle unit - Google Patents
Auxiliary engine cooling water system of gas-steam combined cycle unit Download PDFInfo
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- CN112943456B CN112943456B CN202110270993.4A CN202110270993A CN112943456B CN 112943456 B CN112943456 B CN 112943456B CN 202110270993 A CN202110270993 A CN 202110270993A CN 112943456 B CN112943456 B CN 112943456B
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- water
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- outlet pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/16—Cooling of plants characterised by cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/12—Cooling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
Abstract
The invention relates to an auxiliary machine cooling water system of a gas-steam combined cycle unit, which comprises a closed cooling water system, a first heat exchanger (1), a second heat exchanger (2), a supplementary cooling water system and a cooling oil system. The auxiliary cooling water system is provided with two oil pumps and two water pumps, and a fresh cooling water inlet system, and the cooling efficiency of the cooling system is adjusted in real time by adjusting the switch of each valve and the operation conditions of the water pumps and the oil pumps, so that the auxiliary cooling water system is more suitable for the peak shaving operation mode of starting and stopping the domestic large-capacity gas turbine set day and night.
Description
Technical Field
The invention relates to the technical field of auxiliary machine cooling water systems of thermal power plants, in particular to an auxiliary machine cooling water system of a gas-steam combined cycle unit.
Background
The domestic high-capacity gas-steam combined cycle unit is generally provided with a peak shaving function, the unit is started and stopped frequently, and more units are started and stopped in a two-shift operation mode at night. After the unit is shut down, in order to facilitate the next time of timely starting and preventing the deformation of the rotor of the unit, the unit needs to be turned for a long time. In the process of stopping and turning up the train, the auxiliary machine cooling water quantity of the unit can be greatly reduced, if the unit is designed and put into operation according to a conventional auxiliary machine cooling water system, the unit cannot be better adapted to a two-shift peak shaving operation mode of the internal combustion engine unit, the electricity load consumption during the stopping and turning up process can be greatly increased, and the operation economy of a power plant can be reduced.
If the existing design of the auxiliary machine cooling water system is adopted, the electric load consumption is high during the shutdown and turning, the peak shaving operation mode of the domestic large-capacity gas turbine set in two shifts of daily starting and night stopping can not be adapted, and the operation economy of a power plant is reduced.
Disclosure of Invention
In order to solve the problems, the invention discloses an auxiliary cooling water system of a gas-steam combined cycle unit, which has the following specific technical scheme:
a gas-steam combined cycle unit auxiliary engine cooling water system comprises a closed cooling water system, a first heat exchanger (1), a second heat exchanger (2), a supplementary cooling water system and a cooling oil system, wherein the closed cooling water system comprises a first water outlet pipe (3), a second water outlet pipe (4), a third water outlet pipe (5) and a first water return pipe (6), the first water return pipe (6) is provided with a first water discharge pipe (601), the first water outlet pipe (3), the second water outlet pipe (4) and the third water outlet pipe (5) are all connected with a water inlet of the first heat exchanger (1), one end of the first water return pipe (6) is connected with a water outlet of the first heat exchanger (1), the other end of the first water return pipe is connected with an auxiliary engine (7), the first heat exchanger (1) is provided with a cooling oil inlet and a cooling oil outlet, a first oil pump (8) is arranged on the cooling oil inlet,
the supplementary cooling water system comprises a cooling water inlet pipe (9), a water pump (10), a fourth water outlet pipe (11), a fifth water outlet pipe (12) and a second water return pipe (13), wherein the fourth water outlet pipe (11) and the fifth water outlet pipe (12) are both connected with a water inlet of the second heat exchanger (2), one end of the second water return pipe (13) is connected with a water outlet of the second water heater (2), a cooling oil inlet on the second heat exchanger (2) is connected with a second oil pump (14), and a cooling oil outlet on the second heat exchanger (2) is connected with an oil tank (15);
first outlet pipe (3), second outlet pipe (4), third outlet pipe (5), first return water pipeline (6), fourth outlet pipe (11), fifth outlet pipe (12), second return water pipe (13) on all be provided with electronic shutoff valve (16), water pump (10), first oil pump (8), second oil pump (14) all be connected with automatic control device (17) electricity, realize the automated control to cooling water system.
Furthermore, a second water discharge pipe (18) is arranged on the second water return pipe (13), and the second water discharge pipe (18) and the first water discharge pipe (601) are both connected with a main water discharge pipeline (19).
Furthermore, main drainage pipe (19) be provided with branch pipe (20), branch pipe (20) with first return water pipe (6) connect, the branch pipe on be provided with electronic shutoff valve (16), main drainage pipe (19) on be provided with check valve (21), check valve (21) be located main drainage pipe (19) terminal.
Furthermore, the first water outlet pipe (3), the second water outlet pipe (4), the third water outlet pipe (5), the first water return pipeline (6), the fourth water outlet pipe (11), the fifth water outlet pipe (12) and the second water return pipe (13) are all provided with an electronic flow meter (23), and the electronic flow meter (23) is electrically connected with the automatic control device (17).
Furthermore, the first water return pipeline (6) and the second water return pipeline (13) are both provided with circulating water pumps (22) to accelerate the flow of cooling water in the pipelines.
The invention has the beneficial effects that: the closed cooling water system, the supplementary cooling water system and the cooling oil system are used in a mixed mode, so that the auxiliary engine can efficiently provide cooling water, the cooling efficiency of the cooling water system is improved while the auxiliary engine is suitable for the daily starting and night stopping two-shift peak shaving operation mode of a domestic large-capacity gas turbine unit and the economic cost of operation is reduced, two oil pumps and two water pumps are arranged, fresh cooling water enters the system, and the cooling efficiency of the cooling system is adjusted in real time by adjusting the switch of each valve and the operation conditions of the water pumps and the oil pumps, so that the auxiliary cooling water system is more suitable for the daily starting and night stopping two-shift peak shaving operation mode of the domestic large-capacity gas turbine unit.
Drawings
FIG. 1 is a schematic diagram of the piping layout of an auxiliary cooling water system of a gas-steam combined cycle unit in the invention.
FIG. 2 is a control flow block diagram of an auxiliary cooling water system of a gas-steam combined cycle unit in the invention.
List of reference numerals: 1-a first heat exchanger, 2-a second heat exchanger, 3-a first water outlet pipe, 4-a second water outlet pipe, 5-a third water outlet pipe, 6-a first water return pipe, 601-a first water outlet pipe, 7-an auxiliary machine, 8-a first oil pump, 9-a cooling water inlet pipe, 10-a water pump, 11-a fourth water outlet pipe, 12-a fifth water outlet pipe, 13-a second water return pipe, 14-a second oil pump, 15-an oil tank, 16-an electric shutoff valve, 17-an automatic control device, 18-a second water outlet pipe, 19-a total water outlet pipe, 20-a branch pipe, 21-a check valve, 22-a circulating water pump and 23-an electronic flowmeter.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Examples
With reference to figures 1 to 2 of the drawings,
a gas-steam combined cycle unit auxiliary engine cooling water system comprises a closed cooling water system, a first heat exchanger 1, a second heat exchanger 2, a supplementary cooling water system and a cooling oil system, wherein the closed cooling water system comprises a first water outlet pipe 3, a second water outlet pipe 4, a third water outlet pipe 5 and a first water return pipe 6, the first water return pipe 6 is provided with a first water outlet pipe 601, the first water outlet pipe 3, the second water outlet pipe 4 and the third water outlet pipe 5 are all connected with a water inlet of the first heat exchanger 1, one end of the first water return pipe 6 is connected with a water outlet of the first heat exchanger 1, the other end of the first water return pipe 6 is connected with an auxiliary engine 7, the first heat exchanger 1 is provided with a cooling oil inlet and a cooling oil outlet, the cooling oil inlet is provided with a first oil pump 8,
the supplementary cooling water system comprises a cooling water inlet pipe 9, a water pump 10, a fourth water outlet pipe 11, a fifth water outlet pipe 12 and a second water return pipe 13, wherein the fourth water outlet pipe 11 and the fifth water outlet pipe 12 are both connected with a water inlet of the second heat exchanger 2, one end of the second water return pipe 13 is connected with a water outlet of the second water heater 2, a cooling oil inlet on the second heat exchanger 2 is connected with a second oil pump 14, and a cooling oil outlet on the second heat exchanger 2 is connected with an oil tank 15;
the first water outlet pipe 3, the second water outlet pipe 4, the third water outlet pipe 5, the first water return pipe 6, the fourth water outlet pipe 11, the fifth water outlet pipe 12 and the second water return pipe 13 are all provided with an electric shutoff valve 16, and the electric shutoff valve 16, the water pump 10, the first oil pump 8 and the second oil pump 14 are all electrically connected with an automatic control device 17, so that automatic control of the cooling water system is realized.
Further, a second water discharge pipe 18 is arranged on the second water return pipe 13, and both the second water discharge pipe 18 and the first water discharge pipe 601 are connected with the main water discharge pipe 19.
Furthermore, the main water discharge pipeline 19 is provided with a branch pipe 20, the branch pipe 20 is connected with the first water return pipeline 6, the branch pipe is provided with an electric shutoff valve 16, the main water discharge pipeline 19 is provided with a check valve 21, and the check valve 21 is positioned at the tail end of the main water discharge pipeline 19.
Furthermore, the first water outlet pipe 3, the second water outlet pipe 4, the third water outlet pipe 5, the first water return pipe 6, the fourth water outlet pipe 11, the fifth water outlet pipe 12 and the second water return pipe 13 are all provided with electronic flow meters 23, and the electronic flow meters 23 are all electrically connected with the automatic control device 17.
Further, the first water return pipe 6 and the second water return pipe 13 are both provided with a circulating water pump 22 to accelerate the flow of cooling water in the pipes.
In the working process, the updating of the cooling water in the whole cooling system is controlled by controlling the electric switch valves on the second drain pipe, the branch pipe and the first drain pipe, fresh cooling water is continuously supplemented into the system by the supplementary cooling water system, and the discharged cooling water can be circularly used for the cooling system after being cooled by other modes; the invention is provided with an automatic control system which automatically controls the electronic switch valve through the temperature in each pipeline, thereby controlling the cooling efficiency of the whole system to reach the highest, simultaneously realizing the purposes of economy and energy saving, and better adapting to the peak shaving operation mode of the domestic large-capacity gas turbine set of starting and stopping two shifts every day and night.
The closed cooling water system, the supplementary cooling water system and the cooling oil system are used in a mixed mode, the efficient auxiliary engine provides cooling water, the two-shift peak shaving operation mode of the domestic high-capacity gas turbine unit during daily starting and night stopping is adapted, the economic cost of operation is reduced, meanwhile, the cooling efficiency of the cooling water system is improved, two oil pumps and two water pumps are arranged, fresh cooling water is arranged in the auxiliary engine, the fresh cooling water inlet system is arranged, the cooling efficiency of the cooling system is adjusted in real time by adjusting the switches of all valves and the operation conditions of the water pumps and the oil pumps, and therefore the auxiliary engine cooling water system is more suitable for the two-shift peak shaving operation mode of the domestic high-capacity gas turbine unit during daily starting and night stopping.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (5)
1. The auxiliary machine cooling water system of the gas-steam combined cycle unit is characterized by comprising a closed cooling water system, a first heat exchanger (1), a second heat exchanger (2), a supplementary cooling water system and a cooling oil system, wherein the closed cooling water system comprises a first water outlet pipe (3), a second water outlet pipe (4), a third water outlet pipe (5) and a first water return pipe (6), the first water return pipe (6) is provided with a first water discharge pipe (601), the first water outlet pipe (3), the second water outlet pipe (4) and the third water outlet pipe (5) are all connected with a water inlet of the first heat exchanger (1), one end of the first water return pipe (6) is connected with a water outlet of the first heat exchanger (1), the other end of the first water return pipe is connected with an auxiliary machine (7), and the first heat exchanger (1) is provided with a cooling oil inlet and a cooling oil outlet, a first oil pump (8) is arranged on the cooling oil inlet;
the supplementary cooling water system comprises a cooling water inlet pipe (9), a water pump (10), a fourth water outlet pipe (11), a fifth water outlet pipe (12) and a second water return pipe (13), wherein the fourth water outlet pipe (11) and the fifth water outlet pipe (12) are both connected with a water inlet of the second heat exchanger (2), one end of the second water return pipe (13) is connected with a water outlet of the second heat exchanger (2), a cooling oil inlet on the second heat exchanger (2) is connected with a second oil pump (14), and a cooling oil outlet on the second heat exchanger (2) is connected with an oil tank (15);
the automatic control system is characterized in that an electric shut-off valve (16) is arranged on each of the first water outlet pipe (3), the second water outlet pipe (4), the third water outlet pipe (5), the first water return pipe (6), the fourth water outlet pipe (11), the fifth water outlet pipe (12) and the second water return pipe (13), the electric shut-off valve (16), the water pump (10), the first oil pump (8) and the second oil pump (14) are electrically connected with an automatic control device (17), and automatic control of the cooling water system is achieved.
2. The gas-steam combined cycle unit auxiliary cooling water system as claimed in claim 1, wherein a second water discharge pipe (18) is arranged on the second water return pipe (13), and the second water discharge pipe (18) and the first water discharge pipe (601) are both connected with a main water discharge pipe (19).
3. The gas-steam combined cycle unit auxiliary cooling water system as claimed in claim 2, wherein the main water discharge pipeline (19) is provided with a branch pipe (20), the branch pipe (20) is connected with the first water return pipeline (6), the branch pipe is provided with an electric shutoff valve (16), the main water discharge pipeline (19) is provided with a check valve (21), and the check valve (21) is positioned at the tail end of the main water discharge pipeline (19).
4. The gas-steam combined cycle unit auxiliary cooling water system as claimed in claim 1, wherein the first water outlet pipe (3), the second water outlet pipe (4), the third water outlet pipe (5), the first water return pipe (6), the fourth water outlet pipe (11), the fifth water outlet pipe (12) and the second water return pipe (13) are all provided with an electronic flow meter (23), and the electronic flow meters (23) are all electrically connected with the automatic control device (17).
5. The gas-steam combined cycle unit auxiliary cooling water system as claimed in claim 1, wherein the first water return pipe (6) and the second water return pipe (13) are both provided with circulating water pumps (22) to accelerate the flow of cooling water in the pipes.
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| CN202110270993.4A CN112943456B (en) | 2021-03-12 | 2021-03-12 | Auxiliary engine cooling water system of gas-steam combined cycle unit |
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| CN202110270993.4A CN112943456B (en) | 2021-03-12 | 2021-03-12 | Auxiliary engine cooling water system of gas-steam combined cycle unit |
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| CN112943456B true CN112943456B (en) | 2022-08-12 |
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