Closed water system

Abstract

The utility model provides a closed type water system which comprises a mechanical closed type water tank and a condensed water replenishing tank which are communicated through a closed type water tank water supply pipe, and the condensed water replenishing tank can supply water into the closed type water tank. The closed water tank is connected with the condensed water replenishing tank, the closed pump, the cooler set and the user cooler are further included, the rear end of the user cooler returns water to the closed water tank through a water return pipe, the bypass heat exchange pipe and the water return pipe are arranged in parallel, a part of the bypass heat exchange pipe is soaked in the condensed water replenishing tank, and a switching valve is arranged on the bypass heat exchange pipe. The condensation water supplementing tank and corresponding pipelines do not generate a condensation phenomenon, so that the defect caused by the fact that condensation drops on electrical equipment is avoided; in winter, the temperature of the condensation water replenishing tank is increased to be above the freezing point through heat exchange, so that the condensation water replenishing tank and a pipeline are not frozen, the pipeline is prevented from frost cracking, the reliability of equipment is improved, and economic benefits are increased for enterprises.

Description

Technical Field

[0001] The utility model relates to the technical field of closed cooling water in power plants, and specifically to a closed water system. Background Art

[0002] The closed cooling water system is an important cooling water source for thermal power units, adopting a closed cycle. That is, the closed water enters the closed water pump from the water tank. Powered by the closed water pump, it is cooled by the closed water cooler and then enters the closed water users. After passing through the closed water users (each equipment cooler), the temperature of the closed water rises and returns to the closed water tank, circulating reciprocally. The closed water tank is replenished with water by the condensate make-up water tank, and the make-up water enters the closed water tank through the make-up water pump. However, since there are basically no leakage points in the existing closed water system, the make-up water is less, the water in the condensate make-up water tank flows less, and the temperature is low. Especially in summer, the condensation on the outlet pipeline of the condensate make-up water tank is serious, and the water condensed on the surface of the high-altitude pipeline is likely to fall on the lower electrical equipment such as motors, affecting the safety of the equipment. And when the environmental temperature is high in summer, the cooling effect is poor, resulting in high bearing temperatures of each user equipment and affecting the safe operation of the unit. In winter, due to the fact that the condensate make-up water tank is outdoors, pipeline freezing accidents will also occur. In view of this, a closed water system is proposed. Summary of the Invention

[0003] The technical solution adopted by the utility model to solve its technical problems is: providing a closed water system, including a closed water tank and a condensate make-up water tank, which are connected through a closed water tank water supply pipe, and the condensate make-up water tank supplies water into the closed water tank through a condensate make-up water pump on the closed water tank water supply pipe; it also includes a closed pump, a cooler group, and a user cooler. The closed pump pumps water from the closed water tank into the cooler group, and the cooler group supplies water to the user cooler at its rear end. The rear end of the user cooler returns water to the closed water tank through a return pipe, and the rear end of the cooler group is connected to the closed water system of the second unit. It also includes a bypass heat exchange pipe arranged in parallel with the return pipe. A part of the bypass heat exchange pipe is immersed in the condensate make-up water tank. A bypass valve is arranged on the bypass heat exchange pipe, and a switching valve is arranged on the bypass heat exchange pipe. Among them, the switching valve is located at the parallel section of the return pipe and the bypass heat exchange pipe.

[0004] Preferably, a mixing water pipe is led out from the bypass heat exchange pipe, the end of the mixing water pipe is connected to the condensate make-up water tank, and an auxiliary return water regulating valve is arranged on the mixing water pipe.

[0005] Preferably, a one-way pipe one and a one-way pipe two are added to the pipeline connecting the rear end of the cooler group and the closed water system of the second unit 7. The two are arranged in parallel, and a manual valve, a regulating valve, and a check valve are respectively arranged on their pipelines.

[0006] The beneficial effects of the present utility model are as follows: A bypass heat exchange pipe is led out from the return pipe of the present utility model, and a part of the bypass heat exchange pipe is immersed in the condensate makeup water tank. Since the temperature of the return pipe is higher than the water temperature in the condensate makeup water tank, heat exchange can be achieved, and the water temperature in the condensate makeup water tank can be increased. Therefore, in summer, condensation will not occur in the condensate makeup water tank and the corresponding pipelines, avoiding the adverse effects caused by condensate dripping on electrical equipment; in winter, through heat exchange, the temperature of the condensate makeup water tank is increased above the freezing point, and then freezing does not occur in the condensate makeup water tank and the pipelines, preventing the pipelines from cracking, improving the reliability of the equipment, and increasing economic benefits for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0008] Figure 1 is a schematic structural diagram of an existing closed cooling water system;

[0009] Figure 2 is a schematic structural diagram of the closed cooling water system provided by the embodiment of the present utility model;

[0010] In the figure: 1 - closed water tank, 2 - closed water tank water supply pipe, 3 - closed water pump, 4 - cooler group, 5 - user cooler, 6 - condensate makeup water tank, 7 - closed water system of No. 2 machine, 8 - condensate makeup water pump, 9 - return pipe, 10 - bypass heat exchange pipe, 11 - bypass valve, 12 - water mixing pipe, 13 - one-way pipe 1, 14 - one-way pipe 2, 15 - switching valve, 16 - auxiliary return water regulating valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0011] The following further describes the above solutions with specific embodiments. It should be understood that these embodiments are used to illustrate the present utility model rather than limit the scope of the present utility model. The implementation conditions adopted in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually those in conventional experiments.

[0012] In a specific embodiment, a closed water system is provided, including a closed water tank 1 and a condensate makeup water tank 6, which are connected through a closed water tank water supply pipe 2, and the condensate makeup water tank 6 supplies water to the closed water tank 1 through a condensate makeup water pump 8 on the closed water tank water supply pipe 2, so as to provide cooling makeup water for the closed water tank 1.

[0013] To achieve the cooling of different areas of the equipment, it also includes a closed pump 3, a cooler group 4, and a user cooler 5. During operation, the closed pump 3 pumps water from the closed water tank 1 into the cooler group 4, and the cooler group 4 supplies water to the user cooler 5 at its rear end. To achieve the recovery of cooling water, the rear end of the user cooler 5 returns water to the closed water tank 1 through the return pipe 9, realizing the circulation of cooling water. And the rear end of the cooler group 4 is connected to the closed water system 7 of the second unit. Since the closed water system 7 of the second unit has the same structure as the above-mentioned closed water system, it can be understood that the above-mentioned closed water system is the closed water system of the first unit.

[0014] On this basis, to avoid the condensation of the condensate makeup tank 6 and the pipeline in summer and the freezing of the condensate makeup tank 6 and the pipeline in winter, the present application also includes a bypass heat exchange pipe 10 arranged in parallel with the return pipe 9. A part of the bypass heat exchange pipe 10 is immersed in the condensate makeup tank 6. A bypass valve 11 is provided on the bypass heat exchange pipe 10 to realize the on-off of the bypass heat exchange pipe 10. In addition, a switching valve 15 is provided on the bypass heat exchange pipe 10. Among them, the switching valve 15 is located at the parallel section of the return pipe 9 and the bypass heat exchange pipe 10.

[0015] During summer or winter operation, the switching valve 15 is closed and the bypass valve 11 is opened. At this time, the return water enters the bypass heat exchange pipe 10 through the return pipe 9. Since the bypass heat exchange pipe 10 is placed in the condensate makeup tank 6 and the temperature of the bypass heat exchange pipe 10 is higher than the temperature of the water in the condensate makeup tank 6, heat exchange can be realized here, and the temperature of the bypass heat exchange pipe 10 is conducted to the water in the condensate makeup tank 6. The water temperature in the condensate makeup tank 6 increases, and on the contrary, the temperature of the bypass heat exchange pipe 10 decreases, so that the temperature of the return water flowing back into the closed water tank 1 also decreases, improving the cooling efficiency of the closed water system to a certain extent. Therefore, in summer, the condensate makeup tank 6 and the corresponding pipelines will not produce condensation phenomena, avoiding the adverse effects caused by condensation dripping on electrical equipment; in winter, through heat exchange, the temperature of the condensate makeup tank 6 can reach above 10°C, and then the condensate makeup tank 6 and the pipeline will not freeze, preventing the pipeline from cracking, improving the reliability of the equipment, and increasing economic benefits for the enterprise.

[0016] In addition, a water mixing pipe 12 is led out from the bypass heat exchange pipe 10, and the end of the water mixing pipe 12 is connected to the condensate makeup tank 6. And an auxiliary return water regulating valve 16 is provided on the water mixing pipe 12. The purpose of such a setting is as follows: First, by opening the auxiliary return water regulating valve 16 and the switching valve 15, the water in the return pipe 9 can quickly enter the condensate makeup tank 6, improving the heat exchange efficiency. Second, when the closed water tank 1 and the corresponding pipelines or equipment are repaired, usually the water in the closed water tank 1 and the pipelines or equipment is discharged, which will cause waste. After improvement, by closing the switching valve 15 and the bypass valve 11, the water in the closed water tank 1 can be sent to the condensate makeup tank 6 for storage, effectively saving water resources.

[0017] In addition, when a closed water system is out of service, there are few closed water users, and operating one closed water pump results in waste of plant electricity. To enable two units to share the closed water system, a one-way pipe 13 and a one-way pipe 14 are added to the pipeline connecting the rear end of the cooler group 4 and the closed water system 7 of the second unit. The two are arranged in parallel, and a manual valve, a regulating valve and a check valve are respectively arranged on their pipelines. When one unit is shut down, the corresponding pipeline of the other unit is put into operation, and the closed water cooled by the closed water pump and the cooler of the operating unit is provided. The closed water pump and the makeup water pump of the shutdown unit can be directly shut down. Since the check valves of the one-way pipe 13 and the one-way pipe 14 are in opposite directions, the function of the check valve is that if the quality of the closed water of the shutdown unit is unqualified, the closed water of the operating unit is used to flush the closed water pipeline of the standby unit, and the unqualified closed water is prevented from pouring into the closed water system of the operating unit during the flushing process to pollute the water quality. Therefore, setting the two pipelines can be switched according to the operation needs to ensure the water quality of the closed water system and save plant electricity.

[0018] Inspired by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A closed water system, comprising a closed water tank (1) and a condensate replenishing tank (6), the two being connected via a closed water tank water supply pipe (2), and the condensate replenishing tank (6) supplies water to the closed water tank (1) via a condensate replenishing pump (8) on the closed water tank water supply pipe (2); further comprising a closed pump (3), a cooler group (4) and a user cooler (5), the closed pump (3) pumping water from the closed water tank (1) into the cooler group (4), the cooler group (4) supplying water to the user cooler (5) at its rear end, the rear end of the user cooler (5) returning water to the closed water tank (1) via a return pipe (9), and the rear end of the cooler group (4) being connected to the No. 2 closed water system (7), characterized in that: It also includes a bypass heat exchange pipe (10) arranged in parallel with the return pipe (9), a portion of the bypass heat exchange pipe (10) is immersed in the condensate replenishing tank (6), a bypass valve (11) is arranged on the bypass heat exchange pipe (10), and a switching valve (15) is arranged on the bypass heat exchange pipe (10), wherein the switching valve (15) is located in the parallel section between the return pipe (9) and the bypass heat exchange pipe (10).

2. A closed water system as claimed in claim 1, characterized in that: A water-injection pipe (12) is led out from the bypass heat exchange pipe (10), the end of the water-injection pipe (12) is connected to the condensate water replenishment tank (6), and an auxiliary return water regulating valve (16) is provided on the water-injection pipe (12).

3. A closed water system as claimed in claim 1, characterized in that: A one-way pipe 1 (13) and a one-way pipe 2 (14) are added to the pipeline connecting the rear end of the cooler group (4) with the closed water system (7) of the second unit. The two are arranged in parallel, and a manual door, a regulating valve and a non-return valve are respectively arranged on the pipelines.

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