CN213931118U - Circulating water winter starting anti-freezing system - Google Patents
Circulating water winter starting anti-freezing system Download PDFInfo
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- CN213931118U CN213931118U CN202023210294.0U CN202023210294U CN213931118U CN 213931118 U CN213931118 U CN 213931118U CN 202023210294 U CN202023210294 U CN 202023210294U CN 213931118 U CN213931118 U CN 213931118U
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Abstract
The utility model provides a circulating water system of preventing frostbite that starts in winter, includes indirect air cooling tower, indirect air cooling tower output passes through host computer circulating water cold water wet return and connects the condenser, and the output of condenser passes through host computer circulating water hot water outlet pipe connection indirect air cooling tower, and the condenser input passes through the drain pipe and connects the output of water-water heat exchanger, and the input of water-water heat exchanger passes through the drain pipe and connects the output of vapour-water heat exchanger, vapour-water heat exchanger passes through the steam conduit and connects supplementary steam header, water-water heat exchanger is connected with host computer circulating water cold water wet return and host computer circulating water hot water outlet pipe through circulating water heating cold water pipe and circulating water heating hot water pipe respectively to form a circulation return. The utility model provides the high temperature of circulating water makes it satisfy circulating water system's trial run temperature, has obvious gain effect to preventing frostbite in winter of indirect cooling tower simultaneously.
Description
Technical Field
The utility model relates to a power station circulating water and indirect air cooling system technical field, in particular to circulating water system of preventing frostbite that starts winter.
Background
China is a country with scarce water resources, but the consumption of water resources by a thermal power plant is huge, so the water-saving technology of the power plant is continuously optimized, and the indirect air cooling unit is produced accordingly. In northern areas and water-deficient areas of China, the number of indirect air cooling units is increasing day by day.
In the areas of Sinkiang, Gansu, inner Mongolia and northeast, the environmental temperature may be as low as-twenty-three degrees in winter. For the indirect air cooling unit under construction, the environmental temperature causes great challenge to the commissioning of the circulating water system, the commissioning progress of the power plant is seriously influenced, and the problem of how to treat the anti-freezing of the indirect cooling tower in the commissioning phase becomes an urgent task.
Disclosure of Invention
In order to solve the technical problem, an object of the utility model is to provide a circulating water system of preventing frostbite that starts winter improves the temperature of circulating water, makes it satisfy circulating water system's trial run temperature, prevents frostbite simultaneously to intercooling tower winter have obvious gain effect.
In order to achieve the above object, the utility model discloses a technical scheme with the beneficial effect of the utility model is:
the utility model provides a circulating water winter starts anti-freezing system, includes indirect air cooling tower 1, the condenser 6 is connected through host computer circulating water cold water wet return 19 to indirect air cooling tower 1 of 1 output of indirect air cooling tower, and the output of condenser 6 passes through host computer circulating water hot water outlet pipe 18 and connects indirect air cooling tower 1, and the condenser 6 input passes through the drain pipe and connects the output of water-water heat exchanger 11, and the input of water-water heat exchanger 11 passes through the drain pipe and connects the output of vapour-water heat exchanger 10, vapour-water heat exchanger 10 passes through steam conduit connection auxiliary steam header 7, water-water heat exchanger 11 is connected with host computer circulating water cold water wet return 19 and host computer circulating water hot water outlet pipe 18 through circulating water heating cold water pipe 20 and circulating water heating hot water pipe 21 respectively to form a circulation circuit.
A pipeline is led out of the circulating water heating hot water pipe 21 and is connected with a water supplementing pipeline from desalted water to the indirect air cooling tower, and a connection door 17 is arranged on the pipeline.
And a first electric valve 2 and a second check valve 22 are arranged on the desalted water to indirect air cooling tower water replenishing pipeline.
The pipeline of the host circulating hot water outlet pipe 18 is provided with a host circulating water pump 4, and an inlet and an outlet of the host circulating water pump 4 are respectively provided with a host circulating water pump inlet butterfly valve 5 and a host circulating water pump outlet butterfly valve 3.
And a circulating water heating circulating pump 13 is arranged on the pipeline of the circulating water heating cold water pipe 20, and an electric door III 14 and an electric door IV 15 are respectively arranged at the inlet and the outlet of the circulating water heating circulating pump 13.
And a hot water pipe outlet electric door four 15 and a check valve one 16 are arranged on the circulating water heating hot water pipe 21.
And a steam pipeline connecting the auxiliary steam header 7 with the steam-water heat exchanger 10 is provided with an electric door five 8 and an electric adjusting door 9.
And a drain pipe between the water-water heat exchanger 11 and the condenser 6 is connected to a drain flash tank of the condenser 6.
The steam source of the steam-water heat exchanger 10 is derived from auxiliary steam, the water source is derived from plant heating water, and the water source of the water-water heat exchanger 11 is respectively hydrophobic water and circulating water after the auxiliary steam passes through the steam-water heat exchanger 10.
An operation method for starting an anti-freezing system by circulating water in winter comprises the following steps;
I. the circulating water system is not put into operation;
under the working condition in winter, a heating heat exchange station of a power station starts to work, auxiliary steam with the temperature of about 300 ℃ is pumped out from the auxiliary steam header 7 and is subjected to heat exchange in the steam-water heat exchanger 10 to heat heating circulating water, and the water supply temperature of heating water is controlled by adjusting the opening degree of the electric valve 9. Condensing the heat-exchanged auxiliary steam into water with the temperature of about 80-90 ℃, and allowing the water to flow to a drainage flash tank through a drainage pipeline connected with the drainage flash tank of the condenser 6 after flowing through a water-water heat exchanger 11;
the working condition can ensure daily heating of a plant area;
II, testing and operating conditions of a circulating water system;
in winter, the working condition I normally operates;
when the indirect air cooling unit circulating water system is subjected to water inlet trial operation for the first time, firstly, water is injected into the circulating water system by opening a first electric door 2, a main machine circulating water pump inlet butterfly valve 5, a main machine circulating water pump outlet butterfly valve 3, a second electric door 12, a third electric door 14, a fourth electric door 15 and a fifth electric door 17, wherein the first electric door 2, the main machine circulating water pump inlet butterfly valve 5, the main machine circulating water pump outlet butterfly valve 3, the third electric door 14, the fourth electric door 15 and the fifth electric door 17 are arranged on a water supplementing pipe of the indirect air cooling tower;
when the circulating water system is filled with water, the electric door I2 is closed, the system stops filling water, and at the moment, the electric door II 12 and the electric door V17 are closed. Starting a circulating water heating circulating pump 13, slowly opening a pump outlet electric door II 12, starting circulating water at the temperature of approximately 0 ℃ in a circulating water heating circulating pipeline, and heating the circulating water to 30-40 ℃ after hydrophobic heat exchange between the circulating water and the residual temperature of 80-90 ℃ from a steam-water heat exchanger 10 through a water-water heat exchanger 11; after heat exchange is carried out for a period of time, the overall temperature of circulating water in the circulating water system is obviously increased, after the overall water temperature of the circulating water is heated to 30-40 ℃, the outlet butterfly valve 3 of the circulating water pump of the main engine is closed, the circulating water pump 4 of the main engine is started, the outlet butterfly valve 3 of the circulating water pump of the main engine is opened, and at the moment, the circulating water system starts formal commissioning;
in the early stage of commissioning, the pipeline is washed, the first electric door 2 is opened in a mode of patching and arranging at the same time, the temperature of the water supplement is low, and the heated hot water can be mixed into the water supplement by opening the fifth electric door 17 to increase the temperature of the water supplement, so that the temperature of the whole system is kept constant;
when the circulating water system does not need to be supplemented with water, closing the electric door I2 and the electric door V17;
under the working condition, when the temperature of the circulating water meets the requirement, not only can the circular pipe of the circulating water in the indirect cooling tower be flushed, but also the sector of the indirect cooling tower can be flushed by utilizing the working condition after the flushing water quality is qualified;
III, normal loaded operation condition of the unit;
in winter, the working condition I normally operates;
when the unit is loaded, the circulating water in the circulating water system does not need to be heated, the circulating water heating circulating pump 13 is stopped to operate, and the electric door III 14 and the electric door IV 15 are closed; the circulating water system only carries out circulating heat exchange through a loop of the condenser 6 → the main machine circulating water hot water outlet pipe 18 → the indirect air cooling tower 1 → the main machine circulating water cold water return pipe 19 so as to ensure the normal back pressure of the unit.
The utility model has the advantages that:
the circulating water is heated by using the drain waste heat of the heating heat exchanger of the power station under the working condition in winter, so that the indirect cooling unit can be safely debugged and operated at the cold environment temperature, the safety of system equipment is ensured, and the production progress of the unit is effectively guaranteed. In addition, under the working condition in winter, the system has a certain antifreezing effect on the indirect air cooling tower system when the production unit is shut down.
And the antifreezing effect on the indirect cooling tower in the test run process is enhanced.
Drawings
Fig. 1 is a schematic diagram of the system structure of the present invention.
The system comprises a 1-indirect air cooling tower, a 2-first electric valve, a 3-main circulating water pump outlet butterfly valve, a 4-main circulating water pump, a 5-main circulating water pump inlet butterfly valve, a 6-condenser, a 7-auxiliary steam header, a 8-fifth electric valve, a 9-electric adjusting valve, a 10-steam-water heat exchanger, a 11-water heat exchanger, a 12-second electric valve, a 13-circulating water heating circulating pump, a 14-third electric valve, a 15-hot water pipe outlet fourth electric valve, a 16-first check valve, a 17-fifth electric valve, a 18-main circulating water hot water outlet pipe, a 19-main circulating water cold water return pipe, a 20-circulating water heating cold water pipe, a 21-circulating water heating hot water pipe and a 22-second check valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in the figure, the circulating water winter starting anti-freezing system mainly comprises a condenser 6, a main machine circulating water pump 4, an indirect air cooling tower 1, a water-water heat exchanger 11, a steam-water heat exchanger 10, an auxiliary steam header 7, a circulating water heating circulating pump 13, a main machine circulating water hot water outlet pipe 18, a main machine circulating water cold water return pipe 19, a circulating water heating cold water pipe 20, a circulating water heating hot water pipe 21, a series of connecting pipelines and valves.
The condenser 6 is connected with the indirect air cooling tower 1 through a main machine circulating water hot water outlet pipe 18 and a main machine circulating water cold water return pipe 19. The auxiliary steam header 7 is connected with a steam-water heat exchanger 10 through a steam pipeline. The steam-water heat exchanger 10 is connected with the water-water heat exchanger 11 through a drain pipe. The water-water heat exchanger 11 is connected with the condenser 6 through a drain pipe. In addition, the water-water heat exchanger 11 is connected with a main machine circulating water cold water return pipe 19 and a main machine circulating water hot water outlet pipe 18 through a circulating water heating cold water pipe 20 and a circulating water heating hot water pipe 21, respectively, so as to form a circulation loop. In the circulation loop, a pipeline is led out from a circulating water heating hot water pipe 21 and is connected with a water supplementing pipeline from desalted water to an indirect air cooling tower.
A main machine circulating water pump 4 is arranged on a pipeline of a main machine circulating water hot water outlet pipe 18, and a main machine circulating water pump inlet butterfly valve 5 and a main machine circulating water pump outlet butterfly valve 3 are respectively arranged at the inlet and the outlet of the pump.
A circulating water heating circulating pump 13 is arranged on a pipeline of the circulating water heating cold water pipe 20, and an inlet and an outlet of the circulating water heating circulating pump 13 are respectively provided with a third electric door 14 and a second electric door 12.
The circulating water heating hot water pipe 21 is provided with a hot water pipe outlet electric door four 15 and a check valve one 16.
A fifth connecting electric door 17 is arranged on a pipeline connecting the circulating water heating hot water pipe 21 and the desalted water to the water replenishing pipe of the indirect air cooling tower.
The steam pipeline of the auxiliary steam header 7 connected with the steam-water heat exchanger 10 is provided with an electric door five 8 and an electric adjusting door 9.
A drain pipe between the water-water heat exchanger 11 and the condenser 6 is connected to a drain flash tank of the condenser 6.
The pipeline from the desalted water to the water replenishing pipeline of the indirect air cooling tower is provided with a first electric valve 2 and a second check valve 22.
The steam source of the steam-water heat exchanger 10 is from auxiliary steam, and the water source is from heating water in the plant area.
The water source of the water-water heat exchanger 11 is the drainage and the circulating water after the auxiliary steam passes through the steam-water heat exchanger 10.
In northern areas, in winter, a plant heating system of a building unit is firstly put into use, however, the condensed drainage temperature of auxiliary steam at about 300 ℃ after passing through a heating heat exchange station still has the waste heat of 80-90 ℃. Therefore, the part of hydrophobic waste heat can be used for heating the circulating water with the water temperature close to 0 ℃, so that the temperature of the circulating water is increased, the circulating water meets the trial-run temperature of a circulating water system, and meanwhile, the obvious gain effect on the anti-freezing in winter of the indirect cooling tower is achieved. And this system can still be used after the unit is put into operation.
The working principle of the utility model is as follows:
I. the circulating water system is not put into operation;
in winter conditions, the heating heat exchange station of the power station starts to work, auxiliary steam at about 300 ℃ is pumped out from the auxiliary steam header 7 and is subjected to heat exchange in the steam-water heat exchanger 10 to heat circulating heating water, and the water supply temperature of the heating water is controlled by adjusting the opening degree of the electric valve 9. The auxiliary steam after heat exchange is condensed into water with the temperature of about 80-90 ℃, and flows to the drainage flash tank through a drainage pipeline connected with the drainage flash tank of the condenser 6 after flowing through the water-water heat exchanger 11.
The working condition can ensure daily heating of a plant area.
II test run condition of circulating water system
In winter, the working condition I normally operates.
When the indirect air cooling unit circulating water system is tested for first water inflow, water is injected into the circulating water system by opening the first electric door 2 from the desalted water to the water supplementing pipe of the indirect air cooling tower, the inlet butterfly valve 5 of the main machine circulating water pump, the outlet butterfly valve 3 of the main machine circulating water pump, the second electric door 12, the third electric door 14, the fourth electric door 15 and the fifth electric door 17. When the circulating water system is filled with water, the electric door I2 is closed, and the system stops filling water. At this time, the second electric door 12 and the fifth electric door 17 are closed. And starting the circulating water heating circulating pump 13, slowly opening the second pump outlet electric door 12, and heating the circulating water to 30-40 ℃ after the circulating water with the temperature close to 0 ℃ is subjected to hydrophobic heat exchange with the residual temperature of 80-90 ℃ from the steam-water heat exchanger 10 in a circulating water heating circulating pipeline through the water-water heat exchanger 11. After heat exchange is carried out for a period of time, the overall temperature of circulating water in the circulating water system is obviously increased. After the integral water temperature of the circulating water is heated to 30-40 ℃, the outlet butterfly valve 3 of the circulating pump of the main machine is closed, the circulating pump 4 of the main machine is started, the outlet butterfly valve 3 of the circulating pump of the main machine is opened, and at the moment, the circulating water system starts to be formally put into test operation.
In the earlier stage of the trial run, the pipeline is washed, and the mode that the limit was arranged can be adopted to the limit, consequently will open electrically operated gate 2, and the temperature of moisturizing this moment is lower, can mix into the moisturizing through opening electrically operated gate five 17 with the hot water after the heating to promote the moisturizing temperature, thereby maintain the constancy of temperature of entire system. When the circulating water system does not need to be supplemented with water, the electric doors I2 and V17 can be closed.
Under this operating mode, when the circulating water temperature reaches the requirement, not only can wash the ring canal of indirect cooling tower internal circulating water, can treat to wash quality of water qualified back moreover, utilize this operating mode to go up water washing to the indirect cooling tower sector.
III normal loaded operation condition of unit
In winter, the working condition I normally operates.
When the unit is loaded, the circulating water in the circulating water system does not need to be heated, the circulating water heating circulating pump 13 is stopped to operate, and the electric door three 14 and the electric door four 15 are closed. The circulating water system only carries out circulating heat exchange through a loop of the condenser 6 → the main machine circulating water hot water outlet pipe 18 → the indirect air cooling tower 1 → the main machine circulating water cold water return pipe 19 so as to ensure the normal back pressure of the unit.
The utility model discloses in a circulating water system of preventing frostbite that starts in winter, the hydrophobic waste heat that utilizes supplementary steam after vapour-water heat exchanger heat transfer adds the circulating water, the effectual hydrophobic waste heat that has utilized has ensured winter circulating water system's normal commissioning when having improved hot economic nature. In the later stage of commissioning, the circulating water temperature and the water quality can meet the water feeding condition of the intercooling sector, and then the intercooling sector can be washed, so that the phenomenon that the intercooling sector is frozen and cracked due to too low water temperature is effectively prevented. The system for starting the anti-freezing system in the winter effectively ensures the trial transportation of the circulating water in the alpine region, overcomes the temperature limitation of the trial transportation of the circulating water system in cold seasons, and has certain gain effects on the project progress and the shortening of the winter debugging period.
The utility model discloses security and the frostproofing of intercooling tower to intercooling unit circulating water system in winter trial run have provided some thinking and method, are applicable to the supercritical or ultra supercritical intercooling unit in northern winter severe cold district, but not only are limited to these units. All the above description sets forth the basic principles, the main features and the advantages of the present invention. The present invention is not limited by the above embodiments, and the above embodiments and the description are only illustrative of the principles of the present invention. The utility model discloses there are various changes and improvements in can being based on actual design work progress, and these change all belong to with the improvement the utility model discloses in the scope of claiming.
Claims (9)
1. A circulating water winter starting anti-freezing system is characterized by comprising an indirect air cooling tower (1), wherein the output end of the indirect air cooling tower (1) is connected with a condenser (6) through a main machine circulating water cold water return pipe (19), the output end of the condenser (6) is connected with the indirect air cooling tower (1) through a main machine circulating water hot water outlet pipe (18), the input end of the condenser (6) is connected with the output end of a water-water heat exchanger (11) through a drain pipe, the input end of the water-water heat exchanger (11) is connected with the output end of a steam-water heat exchanger (10) through a drain pipe, the steam-water heat exchanger (10) is connected with an auxiliary steam header (7) through a steam pipeline, the water-water heat exchanger (11) is respectively connected with the main machine circulating water cold water return pipe (19) and a main machine circulating water hot water outlet pipe (18) through a circulating water heating cold water pipe (20) and a circulating water heating hot water pipe (21), forming a circulation loop.
2. A circulating water winter start antifreeze system according to claim 1, characterized in that a pipeline is led out from the circulating water heating hot water pipe (21) and is connected with a desalted water to indirect air cooling tower water supply pipeline, and a connecting door (17) is arranged on the pipeline.
3. The circulating water winter start anti-freezing system as claimed in claim 2, wherein the demineralized water to indirect air cooling tower water replenishing pipeline is provided with a first electric valve (2) and a second check valve (22).
4. A circulating water winter start antifreeze system as set forth in claim 1, characterized in that the pipeline of the hot water outlet pipe (18) of the main circulating water is provided with a main circulating water pump (4), and the inlet and outlet of the main circulating water pump (4) are respectively provided with a main circulating water pump inlet butterfly valve (5) and a main circulating water pump outlet butterfly valve (3).
5. A circulating water winter start antifreeze system according to claim 1, wherein the pipeline of the circulating water heating cold water pipe (20) is provided with a circulating water heating circulating pump (13), and an electric door three (14) and an electric door four (15) are respectively arranged at the inlet and the outlet of the circulating water heating circulating pump (13).
6. A circulating water winter start antifreeze system as set forth in claim 1, characterized in that said circulating water heating hot water pipe (21) is provided with a hot water pipe outlet electric valve four (15) and a check valve one (16).
7. A circulating water winter start antifreeze system according to claim 1, characterized in that the steam pipeline connecting the auxiliary steam header (7) and the steam-water heat exchanger (10) is provided with an electric door five (8) and an electric adjusting door (9).
8. A circulating water winter start antifreeze system according to claim 1, characterized in that the drain pipe between the water-water heat exchanger (11) and the condenser (6) is connected to the drain flash tank of the condenser (6).
9. A circulating water winter start antifreeze system according to claim 1, wherein the steam source of the steam-water heat exchanger (10) is derived from auxiliary steam, the water source is derived from plant heating water, and the water source of the water-water heat exchanger (11) is respectively hydrophobic and circulating water after the auxiliary steam passes through the steam-water heat exchanger (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023210294.0U CN213931118U (en) | 2020-12-28 | 2020-12-28 | Circulating water winter starting anti-freezing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023210294.0U CN213931118U (en) | 2020-12-28 | 2020-12-28 | Circulating water winter starting anti-freezing system |
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| Publication Number | Publication Date |
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| CN213931118U true CN213931118U (en) | 2021-08-10 |
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| CN202023210294.0U Active CN213931118U (en) | 2020-12-28 | 2020-12-28 | Circulating water winter starting anti-freezing system |
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| CN (1) | CN213931118U (en) |
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- 2020-12-28 CN CN202023210294.0U patent/CN213931118U/en active Active
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