CN202403476U - Sealed and circular water cooling device - Google Patents

Abstract

The utility model discloses a sealed and circular water cooling device. The device comprises an internal cooling device, a plate-type heat exchanger (6) and an assistant cooling device; the internal cooling device comprises an internal cooling water circulating pump (2) and an air cooler (3); the assistant cooling device comprises an external cooling water circulating pump (7) and a buried water pipe (8); and the internal cooling water in the internal cooling device, running through the plate-type heat exchanger (6), exchanges heat with the external cooling device in the assistant cooling device, running through the plate-type heat exchanger (6). According to the utility model, the cooking capability is enhanced, the problem that the cooling device still has enough cooling capability when the environment temperature is higher than or equal to the maximum water feeding temperature allowed by the technical apparatus is solved, and the water loss is avoided in the running process of the device, so that the water saving purpose is fulfilled.

Description

Closed circulating water cooling device

technical field

The utility model relates to a cooling device, in particular to a closed circulating water cooling device for recooling the cooling water passing through the air cooler through a plate heat exchanger.

Background technique

At present, many power generation and transmission stations in China, such as converter stations, are built in the arid and water-scarce northern regions. These regions often have the characteristics of high temperature in summer and large water evaporation, so water resources are relatively precious. However, if ordinary water cooling methods are used to cool equipment in power generation and transmission stations such as converter stations, it may consume local rare water resources, so the cooling equipment commonly used in these power stations uses air coolers. Since the ambient temperature of the converter station is relatively low, the use of an air cooler can meet the cooling needs of the process equipment of the power station - the converter valve, and the cooling effect is better.

However, the high temperature in some areas is high, and the air cooler cannot cool the fluid to the ambient temperature, which will limit the application of the air cooler in arid areas. For example, in a certain place in the northwest of China, the maximum temperature in the extreme environment is as high as 44°C, while the maximum inlet temperature of the converter valve, the core equipment in the DC transmission project, is only 40°C. In this case, the air cooler cannot use the converter valve. The pure water is cooling, and conversely, the cooling water is being heated. Therefore, it is not appropriate to apply only air coolers at this time.

At the same time, since power generation equipment and power transmission equipment are often operated with the largest specifications in the hottest summer, and this is the time when the ambient temperature is the highest and most extreme, in this case the air cooler often does not have sufficient cooling capacity, making the replacement The flow station has to take the form of reducing load and power, which brings great economic losses and is not conducive to the healthy development of the national economy.

Contents of the invention

In view of this, a technical problem to be solved by the utility model is to provide a cooling device to improve the cooling capacity of the cooling device.

A closed circulating water cooling device, comprising: an internal cooling device, a plate heat exchanger 6 and an auxiliary cooling device; wherein the internal cooling device includes an internal cooling circulation pump 2 and an air cooler 3; the auxiliary cooling device includes an external cooling device Circulation pump 7 and buried water pipe 8; the internal cooling water flowing through the internal cooling device of the plate heat exchanger 6 and the external cooling water flowing through the auxiliary cooling device of the plate heat exchanger 6 exchange heat.

According to an embodiment of the present invention, the internal cooling device further includes a first circuit valve 4 and a second circuit valve 5; when the first circuit valve 4 is opened and the second circuit valve 5 is closed, the air cooler 3 Form a first circuit with the cooled device 1, and the internal cooling water circulates in the first circuit; when the first circuit valve 4 is closed and the second circuit valve 5 is opened, the cooled device 1, the air cooler 3 and the The plate heat exchanger 6 forms a second circuit in which internal cooling water circulates.

According to an embodiment of the present invention, the internal cooling device further includes a water temperature sensor and/or an ambient temperature sensor, and the water temperature of the internal cooling water measured by the water temperature sensor and/or the ambient temperature measured by the ambient temperature sensor . A control unit for controlling the opening and closing of the first loop valve 4 and the second loop valve 5 .

According to an embodiment of the present invention, the depth of buried water pipe 8 is 30-50 meters.

According to an embodiment of the present utility model, the plate heat exchanger 6 and the buried water pipe 8 form a circulating loop of external cooling circulating water.

According to an embodiment of the present invention, the internal cooling circulating pump 2 and the external cooling circulating pump 6 are configured in a master-standby redundant manner.

According to an embodiment of the utility model, the cooled device 1 is a converter valve in a direct current transmission equipment.

The cooling device of the utility model uses a plate heat exchanger combined with an underground water pipe to re-cool the internal cooling water passing through the air cooler, which improves the cooling capacity of the cooling device and solves the problem that the air cooler cannot cool the fluid to the ambient temperature. The problem is below the ambient temperature, and there is no water loss during the operation of the equipment, which achieves the purpose of water saving. Moreover, when the ambient temperature is low in winter, the internal cooling water is heated by utilizing the relatively high temperature of the water in the buried water pipe, which effectively saves energy consumption.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the appended drawings in the following description The drawings are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without paying creative labor.

Fig. 1 is the schematic diagram according to an embodiment of the cooling device of the present utility model;

Fig. 2 is a schematic diagram of an operating state according to an embodiment of the cooling device of the present invention;

Fig. 3 is a schematic diagram of another operating state of an embodiment of the cooling device according to the present invention.

Detailed ways

The present invention will be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the present invention are illustrated. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The cooling device of the utility model uses a plate heat exchanger combined with an underground water pipe to re-cool the internal cooling water passing through the air cooler, thereby improving the cooling capacity of the cooling device.

The technical scheme of the utility model is described in various aspects below in conjunction with the figures and embodiments.

Fig. 1 is a schematic diagram of an embodiment of a cooling device according to the present invention. As shown in Figure 1, the internal cooling device includes: an internal cooling circulation pump 2, an air cooler 3, a first circuit valve 4, and a second circuit valve 5; the auxiliary cooling device includes: an external cooling circulation pump 7, and an underground water pipe 8; When the first circuit valve 4 is opened and the second circuit valve 5 is closed, the air cooler 3 and the cooled device 1 form a circuit; the internal cooling circulation pump 2 provides power to circulate the internal cooling water in the circuit; wherein, the internal cooling water is air-cooled After the device is cooled by 3, the cooled device 1 is cooled.

When the first circuit valve 4 is closed and the second circuit valve 5 is opened, the cooled device 1, the air cooler 3 and the plate heat exchanger 6 form a circuit; the internal cooling circulation pump 2 provides power to circulate the internal cooling water in the circuit; Wherein, after the internal cooling water is cooled by the air cooler 3, it enters the plate heat exchanger 6 to be further cooled, and then cools the device 1 to be cooled.

The external cooling circulation pump 7 provides power to circulate the external cooling circulating water in the circuit formed by the plate heat exchanger 6 and the buried water pipe 8, wherein the buried water pipe 8 cools the external cooling circulating water. Wherein, the buried water pipe 8 is a water pipe deeply buried in the ground, and the external cooling water in the buried water pipe is cooled by utilizing the relatively low and relatively constant temperature in the ground surface.

According to an embodiment of the present invention, there may be one second circuit valve installed at the water outlet or water inlet of the plate heat exchanger 6 . There may also be two second circuit valves, which are respectively installed at the water outlet and the water inlet of the plate heat exchanger 6 .

According to an embodiment of the utility model, the cooled device 1 is a converter valve in a direct current transmission equipment, and the internal cooling water is pure water.

According to an embodiment of the utility model, after the internal cooling water is heated by the converter valve, it is driven by the internal cooling circulation pump 2, and the internal cooling water will be cooled by the plate heat exchanger 6, and the cooled internal cooling water is supplied by The internal cooling circulation pump 2 is driven and then sent to the diverter valve, and the internal cooling water circulates in this way.

When the ambient temperature is relatively high, close the first circuit valve 4 and open the second circuit valve 5, and use the plate heat exchanger 6 to continue cooling the internal cooling water that has been cooled by the air cooler to the temperature range allowed by the industrial equipment . The plate heat exchanger 6 utilizes the buried water pipe 8 to dissipate heat.

According to an embodiment of the present invention, the cooling device of the present invention utilizes the buried water pipe 8 to realize the functions of winter equipment anti-freezing and fluid heating. For example, in the converter station of the DC transmission project, in order to ensure the safe operation of the process equipment - the converter valve, there will be a requirement that the fluid temperature should not be lower than a certain temperature. Taking the converter valve in the DC transmission project as an example, the minimum inlet valve temperature is generally not lower than 10°C. When the ambient temperature is low and the load of the converter valve is small, an external heating source is required to heat the internal cooling water. When the ambient temperature is low in winter, use the relatively high water temperature in the buried water pipe 8 to close the first loop valve 4 and open the second loop valve 5 to heat the internal cooling water to the level allowed by the industrial equipment using the plate heat exchanger 6 within the temperature range.

According to an embodiment of the present invention, the first circuit valve 4 and the second circuit valve 5 can be automatic or manual valves.

The internal cooling device also includes a control unit, which is not shown in Figure 1. When the temperature of the internal cooling water is higher than the threshold value, the ambient temperature is higher than the threshold value, or the external circulating water is used to heat the internal circulating water in winter, the control unit closes the first circuit valve. 4. Open the second loop valve 5. A water temperature sensor and/or an ambient temperature sensor is arranged in the internal cooling device for measuring the internal cooling water temperature and the ambient temperature.

According to an embodiment of the present invention, the internal cooling circulation pump 2 and the external cooling circulation pump 8 can be configured in a master-standby redundant manner, thereby improving the safety of the operation of the cooling device.

According to an embodiment of the present invention, the plate heat exchanger 6 utilizes the buried water pipe 8 buried underground, generally with a buried depth of 30-50m, to dissipate heat to the earth.

Because the temperature of the formation below the surface of 5-10 meters in the large formation does not change with the change of the outdoor atmospheric temperature, it is basically maintained at 15-17°C all the year round. Therefore, when the ambient temperature exceeds 17° C., the auxiliary cooling system can be started to use the buried water pipe 8 for cooling, reducing the design load of the internal cooling air cooler and reducing the footprint of the cooling equipment.

According to an embodiment of the present utility model, a cooling system for a practical converter valve, under the same cooling capacity (set to 4900kW), when the design ambient temperature of the air cooler is 38°C, the required tube bundle of the air cooler The quantity is 8 units (3 sets of 11kW fan motors in each tube bundle), the size of each tube bundle is 9×3.1m, and the floor area of these air coolers is about 10×25m; and the design ambient temperature of the air cooler is At 17°C, the number of the same tube bundles required for the air cooler becomes 4 (there is still a margin of more than 10% at this time), and its floor area becomes 9×13m. Not only the number of tube bundles of the air cooler has been reduced from 8 to 4, the number of fans has been reduced from 24 to 12, and the floor area has also been reduced by half. The corresponding plate heat exchanger is designed according to the same cooling capacity as the air cooler. At this time, the overall size of the plate heat exchanger is only 0.9×0.8×1.4m, and the occupied area is negligible.

Fig. 2 is a schematic diagram of an operating state of an embodiment of the cooling device according to the present invention. As shown in Figure 2, the internal cooling device includes: an internal cooling circulating pump 2 and an air cooler 3, wherein the cooled device 1 and the air cooler 3 form a circuit; the internal cooling circulating pump 2 provides power to circulate the internal cooling water in the circuit ; Among them, after the inner cooling water is cooled by the air cooler 3, then the cooled device 1 is cooled, and the inner cooling water circulates in such a cycle.

Fig. 3 is a schematic diagram of another operating state of an embodiment of the cooling device according to the present invention. As shown in Figure 3, the internal cooling device includes: internal cooling circulating pump 2, air cooler 3; auxiliary cooling device includes: external cooling circulating pump 7, buried water pipe 8; wherein external cooling circulating pump 7 provides power to make external cooling cycle The water circulates in the loop formed by the plate heat exchanger 6 and the buried water pipe 8, wherein the buried water pipe 8 cools the external cooling circulating water.

The cooled device 1, the air cooler 3 and the plate heat exchanger 6 form a circuit; the internal cooling circulation pump 2 provides power to circulate the internal cooling water in the circuit; wherein, the internal cooling water enters the plate heat exchanger after being cooled by the air cooler 3 The heat exchanger 6 is continued to be cooled, and then the cooled device 1 is cooled; the internal cooling water flowing through the plate heat exchanger 6 exchanges heat with the external cooling water flowing through the plate heat exchanger 6, and the internal cooling water circulates in this way .

It can be seen from the operation of the above-mentioned characteristics of each equipment that all water is in a closed circulation inside the equipment, without any loss and waste of water, reflecting the characteristics of no water consumption.

The cooling device of the utility model solves the problem that the air cooler cannot cool the fluid to the ambient temperature or below. When the ambient temperature is greater than or equal to the maximum water inlet temperature allowed by the process equipment, the air cooler cannot cool the cooling water at one time, but instead heats the cooling water. The cooling device of the present invention still has sufficient cooling capacity to meet the operation needs of the process equipment. The cooling device of the utility model has no water loss during operation, achieves the purpose of saving water, and solves the disadvantage of large water consumption when using a cooling tower. Moreover, when the ambient temperature is low in winter, the relatively high water temperature in the buried water pipe is used to prevent freezing of the outdoor heat exchange equipment and heat the fluid, effectively saving energy consumption.

The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and changes will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principle and practical application of the invention, and to enable those of ordinary skill in the art to understand the invention and design various embodiments with various modifications suitable for particular purposes.

Claims (7)

1. A closed circulating water cooling device, characterized in that, comprising: An internal cooling device, a plate heat exchanger (6) and an auxiliary cooling device; wherein the internal cooling device includes an internal cooling circulation pump (2) and an air cooler (3); the auxiliary cooling device includes an external cooling circulation pump (7) and underground water pipe (8); the internal cooling water flowing through the said internal cooling device of said plate heat exchanger (6) and the said auxiliary cooling device flowing through said plate heat exchanger (6) The external cooling water exchanges heat. 2. The device of claim 1, wherein: The internal cooling device further includes a first loop valve (4) and a second loop valve (5); In the state where the first circuit valve (4) is open and the second circuit valve (5) is closed, the air cooler (3) and the cooled device (1) form a first circuit, and the internal cooling water is in the first circuit cycle; When the first circuit valve (4) is closed and the second circuit valve (5) is open, the cooled device (1), air cooler (3) and plate heat exchanger (6) form a second circuit, internal cooling Water circulates in said second circuit. 3. The device of claim 2, wherein: The internal cooling device also includes a water temperature sensor and/or an ambient temperature sensor, and controls the first loop valve ( 4). A control unit for opening and closing the second loop valve (5). 4. The device of claim 1, wherein: The plate heat exchanger (6) and the buried water pipe (8) form a circulation loop of external cooling circulating water. 5. The device of claim 4, wherein: The burial depth of the buried water pipe (8) is 30-50 meters. 6. The device of claim 1, wherein: The internal cooling circulation pump (2) and the external cooling circulation pump (6) are configured in a master-standby redundant manner. 7. The device of claim 2, wherein: The cooled device (1) is a converter valve in DC power transmission equipment.

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