A recirculating cooling water piping system and a method of piping switching

Abstract

The application provides a circulating cooling water pipeline system and a pipeline switching method, wherein the pipeline system comprises a first pipeline, a second pipeline and a third pipeline, a first heat source, a cold source and a water pump are communicated on the first pipeline; two ends of the second pipeline are communicated on the first pipeline, and a second heat source is further communicated on the second pipeline; two ends of the third pipeline are communicated on the second pipeline and the cold source; on the second pipeline, the distance of the cooling water backflowing to the cold source along the third pipeline is less than the distance of the cooling water backflowing to the cold source along the first pipeline. The application adds the pipeline of the third pipeline to the backwater pipeline of the second pipeline in front of the backwater pipeline of the first pipeline, reduces the backflow distance of the circulating cooling water from the second pipeline, reduces the pipeline pressure loss, obviously reduces the temperature of the heat source, ensures that the heat source is in a stable running state, and solves the risk problem caused by the long-period stable running of the heat source equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial circulating water, in particular to a circulating cooling water pipeline system and a pipeline switching method. BACKGROUND

[0002] In a large air separation device, a large amount of heat is generated when the air compression station is running, and it is necessary to continuously cool and cool it by circulating cooling water to meet the demand of continuous operation. The existing circulating water process route of the air separation device is that the air separation device circulating water field supplies water to the air compression station and the air separation device equipment through a pump, the backwater of the air compression station and the air separation device equipment enters the main pipe network backwater pipeline, and then returns to the cooling tower of the air separation device circulating water field for cooling, and the cooled water is then circulated for water supply. The circulating water for cooling the air compression station is provided by the air separation device circulating water field. Due to the long distance of the pipeline, the pressure loss is large, the circulating water backwater pressure of the air compression station is obviously smaller than the water inlet pressure, the circulating water backwater of the air compression station is combined into the air separation device circulating water backwater main pipe, the pressure is low, and the circulating amount cannot reach the design amount, which cannot meet the requirements of long-period stable operation of the air compression station.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the present application provides a circulating cooling water pipeline system and a pipeline switching method. By adding a third pipeline to connect the backwater pipeline of the second pipeline before the backwater pipeline of the first pipeline, the distance of the circulating cooling water backflow from the second pipeline is reduced to reduce the pipeline pressure loss. The temperature of the heat source is significantly reduced to ensure that it is in a stable running state, thereby solving the risk problem caused by the long-period stable operation of the heat source equipment.

[0005] The present application provides a circulating cooling water pipeline system, comprising a first pipeline, a second pipeline and a third pipeline, a first heat source, a cold source and a water pump are connected to the first pipeline, the water pump makes the cooling water flow from the cold source to the first heat source and then back to the cold source along the first pipeline to form a first loop; the two ends of the second pipeline are connected to the first pipeline, and a second heat source is also connected to the second pipeline; the two ends of the third pipeline are connected to the second pipeline and the cold source; on the second pipeline, the distance of the cooling water backflow to the cold source along the third pipeline is less than the distance of the cooling water backflow to the cold source along the first pipeline.

[0006] In an embodiment of the present application, the first end of the second pipeline connecting the first pipeline is located between the water pump and the first heat source, and the second end of the second pipeline connecting the first pipeline is located between the first heat source and the cold source.

[0007] In an embodiment of the present application, the third pipeline is connected to the second end of the second pipeline.

[0008] In an embodiment of the present application, the cooling source is a cooling tower, the first pipeline is connected to the upper part of the cooling tower, and the third pipeline is connected to the lower part of the cooling tower.

[0009] In an embodiment of the present application, the third pipeline and the first pipeline are connected to each other in a four-way connection at the upper part of the cooling tower.

[0010] In an embodiment of the present application, the first pipeline is provided with a first water inlet valve and a first water return valve on two sides of the four-way connection, the first water inlet valve is located between the cooling source and the four-way connection, and the first water return valve is located between the four-way connection and the second pipeline.

[0011] In an embodiment of the present application, the second pipeline is provided with a second water return valve, and the second water return valve is located between the first pipeline and the third pipeline.

[0012] In an embodiment of the present application, the third pipeline is provided with a third water inlet valve and a third water return valve on two sides of the four-way connection, the third water inlet valve is located between the cooling source and the four-way connection, and the third water return valve is located between the four-way connection and the second pipeline.

[0013] The present application also provides a circulating cooling water pipeline switching method, comprising:

[0014] monitoring the cooling water temperature of the water return pipeline in the circulating cooling water pipeline;

[0015] determining the position of the water return pipeline connected to the cooling tower based on the cooling water temperature;

[0016] when the cooling water temperature is not less than a set value, connecting the water return pipeline in the circulating cooling water pipeline to the upper part of the cooling tower;

[0017] when the cooling water temperature is less than the set value, connecting the water return pipeline in the circulating cooling water pipeline to the lower part of the cooling tower.

[0018] In an embodiment of the present application, before the step of monitoring the cooling water temperature of the water return pipeline in the circulating cooling water pipeline, the method further comprises:

[0019] monitoring the water inlet pressure parameter and the water return pressure parameter in the cooling water pipeline;

[0020] determining the water pump operating power of the water inlet pipeline in the cooling water pipeline based on the water inlet pressure parameter;

[0021] determining the valve opening degree of the water return pipeline in the cooling water pipeline based on the water return pressure parameter.

[0022] The beneficial effects of the present application are: by adding a third pipeline to connect the return water pipeline of the second pipeline and the cooling tower of the cold source before the return water pipeline of the first pipeline communicating with the first heat source air separation device, the newly added third pipeline is used as a branch to reduce the distance of circulating cooling water returning to the cooling tower of the cold source from the second pipeline, so as to reduce the pipeline pressure loss; and the circulating cooling water can be directly connected to the top of the cooling tower to facilitate direct spray cooling, saving the consumption of pipeline materials and space occupation; and when the seasonal temperature is sufficient for cooling, the fan power consumption of the cooling tower is saved, and the ambient temperature is directly used to meet the heat exchange at the bottom of the tower; so that the temperature of the air compressor station oil cooler as the second heat source is obviously reduced, ensuring its stable operation state, and reducing the operation risk brought by high temperature weather in summer.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application. It is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art. In the drawings:

[0025] Figure 1 is a schematic diagram of the circulating cooling water pipeline system of the present application;

[0026] Figure 2 is a flow chart of the circulating cooling water pipeline switching method of the present application.

[0027] In the figure: 1, first pipeline; 11, first water inlet valve; 12, first water return valve; 2, second pipeline; 21, second water return valve; 3, third pipeline; 31, third water inlet valve; 32, third water return valve; 4, first heat source; 5, cold source; 6, water pump; 7, second heat source; 8, four-way connection. DETAILED DESCRIPTION

[0028] Following, the advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the specification. The present application can also be implemented or applied by means of other different specific embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present application are for the purpose of describing specific specific embodiments, but not for limiting the protection scope of the present application. The test methods in the following examples are not specified, which are generally carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0029] Please refer to Figures 1 to 2 It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not have technical significance to limit the conditions under which the present application can be implemented. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technology disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only for the purpose of clear understanding, and not for limiting the scope of the present application, the change or adjustment of relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0030] Please refer to Figure 1 The present application provides a circulating cooling water pipeline system, comprising a first pipeline 1, a second pipeline 2 and a third pipeline 3, a first heat source 4, a cold source 5 and a water pump 6 are communicated on the first pipeline 1, the water pump 6 makes the cooling water flow from the cold source 5 to the first heat source 4 along the first pipeline 1 and then back to the cold source 5 to form a first loop; the two ends of the second pipeline 2 are communicated on the first pipeline 1, and a second heat source 7 is also communicated on the second pipeline 2; the two ends of the third pipeline 3 are communicated on the second pipeline 2 and the cold source 5; on the second pipeline 2, the distance of the cooling water backflowing to the cold source 5 along the third pipeline 3 is less than the distance of the cooling water backflowing to the cold source 5 along the first pipeline 1.

[0031] Further, the first end of the second pipeline 2 communicating the first pipeline 1 is located between the water pump 6 and the first heat source 4, and the second end of the second pipeline 2 communicating the first pipeline 1 is located between the first heat source 4 and the cold source 5. The third pipeline 3 is communicated at the second end of the second pipeline 2.

[0032] Specifically, the cold source 5 is set as a cooling tower, the first pipeline 1 is communicated at the upper part of the cooling tower, and the third pipeline 3 is communicated at the lower part of the cooling tower.

[0033] The first pipeline 1, the second pipeline 2 and the third pipeline 3 can be understood as three circulating cooling water loops formed between the first heat source 4, the second heat source 7 and the cold source 5. The first pipeline 1 is connected to the first heat source 4 and the cold source 5, and the circulating cooling water is continuously driven to flow in the same direction by the water pump 6 on the first pipeline 1. The second pipeline 2 is the circulating cooling water pipeline of the second heat source 7, which can be understood as a branch line drawn from the circulating cooling water loop of the first pipeline 1, and the cold source 5 on the first pipeline 1 is used to exchange heat for the second heat source 7. The third pipeline 3 is a backwater pipeline segment of the circulating cooling water in the second pipeline 2 directly connected to the cold source 5, which saves the distance of the circulating cooling water flowing from the second pipeline 2 to the first pipeline 1 and then back to the cold source 5. Thus, the pipeline parameter index of the circulating cooling water backflowing from the second pipeline 2 to the cold source 5 is improved, the circulating cooling water flow is improved, and the pipeline pressure loss is reduced.

[0034] In the embodiment, the first heat source 4 is a large air separation device in the factory production equipment, the second heat source 7 is air compression station equipment, and the cold source 5 is an air separation device circulating water field cooling tower. In order to ensure that the large amount of heat generated by the air compression station during operation does not affect its long-period stable operation, the third pipeline 3 is added as a branch line to directly introduce the backwater of the air compression station to the air separation device circulating water field cooling tower before the backwater of the air compression station circulating cooling water enters the main pipeline network backwater pipeline of the first pipeline 1, the cooling tower of the cold source 5 along the backwater pipeline of the second pipeline 2. Thus, the backwater distance of the pipeline where the air compression station circulating cooling water is located is shortened, and the backwater pressure resistance is reduced.

[0035] The third pipeline 3 is added to connect the backwater pipeline of the air compression station and the cooling tower before the backwater pipeline of the air separation device is connected to the first pipeline 1. Thus, the backflow distance of the circulating cooling water is reduced by adding the pipeline branch, so as to reduce the pipeline pressure loss.

[0036] In an embodiment, before the modification, the supply water pressure of the air separation device circulating water field through the first pipeline 1 is 0.47 MPa, the backwater pressure of the first pipeline 1 is 0.27 MPa, the inlet water pressure of the air compression station circulating water through the second pipeline 2 is 0.27 MPa, and the backwater pressure of the second pipeline 2 is 0.21 MPa. By adding the third pipeline 3 described above, after the modification, the inlet water pressure of the air compression station circulating water through the second pipeline 2 is reduced from 0.27 MPa to 0.24 MPa, the backwater pressure of the second pipeline 2 is reduced from 0.21 MPa to 0.16 MPa, the circulating water flow of the second pipeline 2 is increased from 1450 m 3 / h to 2135 m 3 / h, the air compression station oil cooler temperature is reduced from 49℃ to 46℃, the operation is stable, and the operation risk brought by the high temperature weather in summer is reduced.

[0037] It should be noted that the above embodiment reduces the water inlet pressure of the second pipeline 2 of the air compression station before and after the transformation, thereby increasing the pressure difference between the water inlet pressure of the second pipeline 2 of the air compression station and the water inlet pressure of the first pipeline 1 of the air separation device, thereby increasing the water inlet flow of the second pipeline 2 of the air compression station, and improving the heat exchange performance of the circulating cooling water pipeline system.

[0038] Please refer to Figure 1 In an embodiment, at the upper part of the cooling tower, the third pipeline 3 and the first pipeline 1 are provided with a four-way connection 8. The first pipeline 1 is provided with a first water inlet valve 11 and a first water return valve 12 on both sides of the four-way connection 8, the first water inlet valve 11 is located between the heat source 5 and the four-way connection 8, and the first water return valve 12 is located between the four-way connection 8 and the second pipeline 2. The second pipeline 2 is provided with a second water return valve 21, which is located between the first pipeline 1 and the third pipeline 3. The third pipeline 3 is provided with a third water inlet valve 31 and a third water return valve 32 on both sides of the four-way connection 8, the third water inlet valve 31 is located between the heat source 5 and the four-way connection 8, and the third water return valve 32 is located between the four-way connection 8 and the second pipeline 2.

[0039] After adding the third pipeline 3 in the circulating cooling water pipeline system, the second water return valve 21 is arranged in the water return pipeline section of the second pipeline 2 connected to the first pipeline 1. By controlling the second water return valve 21, the air compression return water and the main pipe network return water are in an open circuit state, so that the cooling water flowing from the second pipeline 2 to the heat source 5 flows back along the third pipeline 3.

[0040] It should be noted that the four-way connection 8 is arranged between the third pipeline 3 and the first pipeline 1, and the first water inlet valve 11, the first water return valve 12, the third water inlet valve 31 and the third water return valve 32 are arranged on the first pipeline 1 and the third pipeline 3 on both sides of the four-way connection 8. Then, according to the season, the flow direction of the circulating cooling water flowing back to the four-way connection 8 can be selected, and the circulating cooling water can flow back to the top or bottom of the cooling tower. For example, for circulating water with low winter return water temperature, the circulating water can not enter the upper part of the tower for cooling, but can be directly introduced into the bottom of the cooling tower, thereby saving energy consumption and ensuring the normal operation of the air compression station equipment. It is easy to think that the pipeline and valve thus arranged also form a bypass design in the circulating cooling water pipeline, further improving the practicality of the circulating cooling water pipeline.

[0041] Therefore, the circulating cooling water in the present embodiment can directly communicate with the top of the cooling tower to facilitate direct spray cooling, saving the consumption of pipeline materials and space occupation for re-laying; and when the temperature is low enough in the season, the fan power consumption of the cooling tower is saved, and the environment temperature is directly used to meet the heat exchange by entering the bottom of the tower.

[0042] Similarly, the valves (i.e. the first water inlet valve 11, the first water return valve 12, etc. in the above embodiment) arranged on the pipelines (i.e. the first pipeline 1, the second pipeline 2 and the third pipeline 3) can also control the flow of the pipelines into and return to the cooling tower and adjust the pressure to ensure the stability of the system.

[0043] Please refer to Figure 2 The application also provides a circulating cooling water pipeline switching method, which comprises the following steps: monitoring the cooling water temperature of the water return pipeline in the circulating cooling water pipeline; determining the position of the water return pipeline connected to the cooling tower based on the cooling water temperature; when the cooling water temperature is not less than a set value, connecting the upper part of the cooling tower to the water return pipeline in the circulating cooling water pipeline; and when the cooling water temperature is less than the set value, connecting the lower part of the cooling tower to the water return pipeline in the circulating cooling water pipeline.

[0044] In the embodiment, the cooling water in the circulating cooling water pipeline exchanges heat between the heat source and the cold source 5, for example, the cooling tower used as the cold source 5. The hot water state of the return cooling water is uniformly sprayed on the filler of the cooling tower through the spraying device, and the heat is transferred to the air by using the large surface area and complex shape of the filler to form a thin water film. At the same time, cool air is blown into the cooling tower from the bottom, and the air is heated after absorbing heat by contacting with the hot water, and then discharged from the top of the cooling tower. The heat is absorbed through the heat and mass transfer between the water and the air, so that the water temperature is lowered and maintained within the required temperature range.

[0045] When the ambient temperature is sufficient to exchange heat and cool the circulating cooling water returned to the cooling tower, the circulating cooling water is directly returned to the water storage pool at the bottom of the cooling tower by selecting the water return pipeline, thereby saving the power consumption of the cooling tower spraying cooling.

[0046] Further, before the step of monitoring the cooling water temperature of the water return pipeline in the circulating cooling water pipeline, the method further comprises the following steps: monitoring the water inlet pressure parameter and the water return pressure parameter in the cooling water pipeline; determining the running power of the water pump 6 in the water inlet pipeline in the cooling water pipeline based on the water inlet pressure parameter; and determining the opening degree of the valve in the water return pipeline in the cooling water pipeline based on the water return pressure parameter. In the embodiment, the sensors arranged in the circulating cooling water system detect the water pressure and flow, cooperate with the detection of the water supply temperature and the water return temperature of the circulating cooling water, and combine the cooling performance of the cooling tower as the cold source 5 and the heat production of the air compression station as the heat source. The opening degree of the valve is adjusted and the water pump 6 in the circulating cooling water pipeline is controlled to be in the optimal running power range, so as to further improve the running efficiency of the circulating cooling water pipeline system.

[0047] In summary, the circulating cooling water pipeline system and pipeline switching method provided by the application reduces the distance of circulating cooling water flowing back to the cooling tower of the cold source 5 through the newly added third pipeline 3 as a branch to reduce the pipeline pressure loss; the circulating cooling water can be directly connected to the top of the cooling tower to facilitate direct spraying and cooling, saving the consumption of pipeline materials and space occupation; and when the temperature is low enough in seasons, the fan power consumption of the cooling tower is saved, and the ambient temperature is directly used to meet the heat exchange at the bottom of the tower; thereby the temperature of the air compressor station oil cooler as the second heat source 7 is obviously reduced, ensuring that it is in a stable running state, and reducing the running risk brought by high temperature weather in summer.

[0048] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A recirculating cooling water piping system characterized by, The application relates to a circulating cooling water system, which comprises: a first pipeline (1) connected with a first heat source (4), a cold source (5) and a water pump (6), wherein the water pump (6) makes the cooling water flow along the first pipeline (1) from the cold source (5) to the first heat source (4) and then back to the cold source (5) to form a first loop; a second pipeline (2) connected at both ends with the first pipeline (1), and further connected with a second heat source (7); a third pipeline (3) connected at both ends with the second pipeline (2) and the cold source (5); the distance of the cooling water flowing along the third pipeline (3) back to the cold source (5) in the second pipeline (2) is shorter than the distance of the cooling water flowing along the first pipeline (1) back to the cold source (5); wherein the cold source (5) is a cooling tower, the first pipeline (1) is connected at the upper part of the cooling tower, and the third pipeline (3) is connected at the lower part of the cooling tower; the third pipeline (3) and the first pipeline (1) are connected in a four-way connection (8) at the upper part of the cooling tower; the first pipeline (1) is respectively provided with a first water inlet valve (11) and a first water return valve (12) on both sides of the four-way connection (8); the third pipeline (3) is respectively provided with a third water inlet valve (31) and a third water return valve (32) on both sides of the four-way connection (8).

2. The piping system of claim 1, wherein, The first end of the second pipeline (2) connected with the first pipeline (1) is located between the water pump (6) and the first heat source (4), and the second end of the second pipeline (2) connected with the first pipeline (1) is located between the first heat source (4) and the cold source (5).

3. The piping system of claim 2, wherein, The third pipeline (3) is connected at the second end of the second pipeline (2).

4. The piping system of claim 1, wherein, The first water inlet valve (11) is located between the cold source (5) and the four-way connection (8), and the first water return valve (12) is located between the four-way connection (8) and the second pipeline (2).

5. The piping system according to claim 1, wherein, The second pipeline (2) is provided with a second water return valve (21) located between the first pipeline (1) and the third pipeline (3).

6. The piping system of claim 1, wherein, The third water inlet valve (31) is located between the cold source (5) and the four-way connection (8), and the third water return valve (32) is located between the four-way connection (8) and the second pipeline (2).

7. A method of switching a circulating cooling water line applied to the circulating cooling water line system according to any one of claims 1 to 6, characterized by, The application further relates to a method for controlling the circulating cooling water system, which comprises the following steps: monitoring the cooling water temperature of the backwater pipeline in the circulating cooling water pipeline; determining the position of the backwater pipeline connected with the cooling tower based on the cooling water temperature; when the cooling water temperature is not less than a set value, making the backwater pipeline in the circulating cooling water pipeline connected with the upper part of the cooling tower; when the cooling water temperature is less than a set value, making the backwater pipeline in the circulating cooling water pipeline connected with the lower part of the cooling tower; when the cooling water temperature is less than a set value, opening the third water inlet valve in the backwater pipeline, closing the first water inlet valve, making the backwater pipeline connected with the lower part of the cooling tower through the four-way connection, and closing the fan of the cooling tower.

8. The method of claim 7, wherein, Before the step of monitoring the cooling water temperature of the return water line in the circulating cooling water pipeline, further comprising: monitoring an inlet water pressure parameter and a return water pressure parameter in the cooling water pipeline; determining a water pump operating power of an inlet water line in the cooling water pipeline based on the inlet water pressure parameter; determining a valve opening degree of a return water line in the cooling water pipeline based on the return water pressure parameter.

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