Cooling device for drain tank

Abstract

The utility model belongs to the technical field of drain tanks, and particularly discloses a drain tank cooling device which comprises a drain tank, the top of the drain tank is respectively communicated with a circulating water outlet main pipe and a circulating water return main pipe through pipelines, the lower portion of the drain tank is connected with a deaerator through a pipeline, and a cooling assembly is arranged in the drain tank. The cooling assembly is used for cooling drain water in the drain tank. According to the utility model, the condenser pipe exchanges heat with high-temperature steam and drain water entering the drain tank, so that the high-temperature steam is condensed into water, the high-temperature steam entering the drain tank is prevented from vaporizing the drain water again, and the recycling rate of water resources is increased; the problem that the water seal of the drainage pump is heated by high-temperature steam to cause serious aging of the water seal can also be avoided; in addition, compared with a water supplementing device of a drain tank in the prior art, the condenser pipe is longitudinally arranged in the drain tank, drain water and high-temperature steam on the upper layer, the middle layer and the lower layer in the drain tank can be cooled, the cooling range is enlarged, and the cooling effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drain tanks, in particular to a drain tank cooling device. Background Art

[0002] During the production process of a power plant, a large amount of high-temperature and high-pressure steam and main steam pipe steam will be generated when starting and stopping the steam turbine and boiler. Air preheater steam will be generated during the normal operation stage. These high-temperature and high-pressure steam do not do work for the steam turbine, and directly discharging them into the atmosphere will cause energy waste. Therefore, this part of high-temperature and high-pressure steam must be recovered and reused through a drain tank.

[0003] Reference Figure 1 The prior art drain box includes a box body (2), the top of the box body (2) is connected to the circulating water outlet main pipe (3) and the circulating water return main pipe (4) through pipelines, the lower part of the box body (2) is connected to the deaerator (5) through pipelines, and a drain pump (6) is arranged on the pipeline between the box body (2) and the deaerator (5). Since the gas entering the drain box is high-temperature gas, such as boiler soot blowing warming pipe drain and superheater drain, the drain temperature of these drains is 200℃~300℃, directly entering the drain box will cause the water in the drain box to re-vaporize, and the vaporized steam is discharged to the atmosphere through the drain valve, resulting in waste of water resources and cannot be recovered; secondly, the water at the bottom of the drain box is heated by high-temperature steam, which causes the water seal of the drain pump to age seriously, resulting in frequent replacement of the water seal of the drain pump, which not only affects production, but also increases production costs.

[0004] The applicant is committed to the research of waste incineration power generation equipment, and in 2022 applied for a drain tank water replenishment device with publication number CN218328109U, including a deaerator, a drain tank and a drain expansion tank arranged above the drain tank, the drain tank is connected to the drain expansion tank, and a drain pump is arranged on the pipeline connected between the drain tank and the deaerator, and the drain tank is provided with a cooling device for cooling the drain in the drain tank; the cooling device includes a desalted water tank, the desalted water tank is connected to the middle part of the drain tank by a pipeline, and a regulating valve and a desalted water pump are arranged on the pipeline connected between the desalted water tank and the drain tank. However, in this application, the cooling of the drain in the drain tank is achieved by passing desalted water at room temperature into the middle part of the drain tank. Since the desalted water at room temperature is introduced into the middle part of the drain tank, only the drain in the middle part of the drain tank can be cooled, and the drain in the upper and lower parts of the drain tank cannot be cooled. Therefore, it can be seen that the drain tank water replenishment device in the prior art has a narrow cooling range and poor cooling effect. Utility Model Content

[0005] Aiming at the technical problems of narrow cooling range and poor cooling effect of the water replenishing device for a drain tank in the prior art, the utility model provides a drain tank cooling device.

[0006] The technical solution adopted by the utility model is: a drain tank cooling device, comprising a drain tank, the top of which is connected to a circulating water outlet main pipe and a circulating water return main pipe through pipelines respectively, the lower part of the drain tank is connected to a deaerator through a pipeline, a drain pump is arranged on the pipeline connected between the drain tank and the deaerator, a cooling component is arranged in the drain tank, and the cooling component is used to cool the drain in the drain tank; the cooling component comprises a condenser arranged longitudinally in the drain tank, one end of the condenser is connected to the circulating water outlet main pipe through a water inlet pipe, and the other end of the condenser is connected to the circulating water return main pipe through a water outlet pipe.

[0007] Furthermore, the condenser is arranged in a spiral shape in the drain tank.

[0008] Furthermore, the condenser is arranged on a side close to the inner wall of the drain tank.

[0009] Furthermore, the condenser is made of stainless steel.

[0010] Furthermore, a water inlet valve is arranged on the water inlet pipe, and a water outlet valve is arranged on the water outlet pipe.

[0011] Furthermore, both the water inlet valve and the water outlet valve are manual valves.

[0012] Furthermore, a drain pipe is provided on the top of the drain tank, and a drain valve is provided on the drain pipe.

[0013] Furthermore, the drain pump is a centrifugal pump.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model exchanges heat with the high-temperature steam and drain entering the drain tank through the condenser tube, so that the high-temperature steam condenses into water, thereby avoiding the high-temperature steam entering the drain tank to vaporize the drain again, increasing the recycling rate of water resources; it can also avoid the problem of serious aging of the water seal of the drain pump due to the heating of the high-temperature steam, thereby reducing the maintenance rate of the drain pump.

[0016] 2. Compared with the prior art, the condenser of the utility model is longitudinally arranged in the drain box, which can cool the drain and high-temperature steam at the upper, middle and lower levels in the drain box, thereby increasing the cooling range and improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a drain tank in the prior art.

[0018] Figure 2 It is a structural schematic diagram of the utility model.

[0019] The markings in the figure are: 1. Drain tank; 2. Tank body; 3. Circulating water outlet main pipe; 4. Circulating water return main pipe; 5. Deaerator; 6. Drain pump; 7. Condenser; 8. Inlet pipe; 9. Outlet pipe; 10. Inlet valve; 11. Outlet valve; 12. Drain pipe; 13. Drain valve; 14. Sewage pipe; 15. Sewage valve. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that the terms "front", "up", "down", "left", "right", "vertical", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] The following is combined with Figure 2 The utility model is further described.

[0023] Example

[0024] In view of the technical problems existing in the background technology, the utility model provides a drain tank cooling device.

[0025] In the specific technical solution, refer to Figure 2 The drain tank cooling device includes a drain tank 1. The top of the drain tank 1 is connected to the circulating water outlet main pipe 3 and the circulating water return main pipe 4 through pipelines. The lower part of the drain tank 1 is connected to the deaerator 5 through a pipeline. A drain pump 6 is arranged on the pipeline connected between the drain tank 1 and the deaerator 5.

[0026] The above structure is the same as that of a traditional drain tank. Therefore, in view of the technical problems of narrow cooling range and poor cooling effect of the prior art drain tank water replenishing device mentioned in the background technology, the utility model makes the following improvements:

[0027] Specifically, the utility model is provided with a cooling component in the drain tank 1, and the cooling component is used to cool the drain in the drain tank 1; the cooling component includes a condenser 7 longitudinally arranged in the drain tank 1, one end of the condenser 7 is connected to the circulating water outlet main pipe 3 through the water inlet pipe 8, and the other end of the condenser 7 is connected to the circulating water return main pipe 4 through the water outlet pipe 9. Circulating water is originally used as cooling water in the waste incineration power generation system. The present application cleverly utilizes the cooling function of circulating water, and a condenser is arranged in the drain tank, and the condenser is connected to the circulating water. In the process of circulating water flowing through the condenser, the condenser exchanges heat with the high-temperature steam and drain entering the drain tank through the condenser, so that the high-temperature steam condenses into water, thereby avoiding the high-temperature steam entering the drain tank to re-vaporize the drain, and increasing the recycling rate of water resources; it can also avoid the problem of serious aging of the water seal of the drain pump due to the heating of the high-temperature steam, and reduce the maintenance rate of the drain pump. In addition, compared with the drain tank water replenishing device in the prior art, the condenser of the utility model is longitudinally arranged in the drain tank, which can cool the drain and high-temperature steam at the upper, middle and lower layers in the drain tank, thereby increasing the cooling range and improving the cooling effect.

[0028] In order to increase the contact area between the condenser and the drain tank, refer to Figure 2 In this embodiment, the condenser pipe 7 is designed to be spirally arranged in the drain tank 1. In addition, the condenser pipe 7 is also arranged on one side close to the inner wall of the drain tank 1 in this embodiment, so as not to affect the internal components of the drain tank and not to interfere with each other.

[0029] The condenser 7 of this embodiment is made of stainless steel. Stainless steel has the advantages of corrosion resistance, rust resistance, high heat transfer efficiency, high hardness, etc. It can meet the complex working conditions of the drain tank and is very suitable for making condensers.

[0030] In order to facilitate maintenance and repair of the drain tank and the condenser pipe, the present embodiment further provides an inlet valve 10 on the inlet pipe 8 and an outlet valve 11 on the outlet pipe 9. Due to the low frequency of use and complex working conditions, the inlet valve 10 and the outlet valve 11 are designed as manual valves.

[0031] In this embodiment, a drain pipe 12 is further provided at the top of the drain box 1, and a drain valve 13 is provided on the drain pipe 12 to avoid excessive pressure in the drain box and ensure air pressure balance.

[0032] The drain pump 6 of this embodiment is a centrifugal pump, which has the advantages of simple and compact structure, continuous and uniform flow, convenient maintenance, high efficiency and high precision.

[0033] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A drain tank cooling device, comprising a drain tank (1), wherein the top of the drain tank (1) is connected to a circulating water outlet main pipe (3) and a circulating water return main pipe (4) through pipelines, the lower part of the drain tank (1) is connected to a deaerator (5) through a pipeline, and a drain pump (6) is provided on the pipeline connected between the drain tank (1) and the deaerator (5), characterized in that: The drain box (1) is provided with a cooling component, and the cooling component is used to cool the drain in the drain box (1); The cooling component comprises a condenser (7) longitudinally arranged in the drain tank (1); one end of the condenser (7) is connected to the circulating water outlet main pipe (3) through a water inlet pipe (8); and the other end of the condenser (7) is connected to the circulating water return main pipe (4) through a water outlet pipe (9).

2. The drain tank cooling device according to claim 1, characterized in that: The condenser pipe (7) is arranged in a spiral shape inside the drain tank (1).

3. The drain tank cooling device according to claim 2, characterized in that: The condenser pipe (7) is arranged on a side close to the inner wall of the drain tank (1).

4. The drain tank cooling device according to claim 1, characterized in that: The condenser (7) is made of stainless steel.

5. The drain tank cooling device according to claim 1, characterized in that: The water inlet pipe (8) is provided with a water inlet valve (10), and the water outlet pipe (9) is provided with a water outlet valve (11).

6. The drain tank cooling device according to claim 5, characterized in that: The water inlet valve (10) and the water outlet valve (11) are both manual valves.

7. The drain tank cooling device according to claim 1, characterized in that: A drain pipe (12) is provided at the top of the drain tank (1), and a drain valve (13) is provided on the drain pipe (12).

8. The drain tank cooling device according to claim 1, characterized in that: The drain pump (6) is a centrifugal pump.

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