Hybrid Cooling Device and Circulating Cooling Water System

Abstract

Embodiments of the present invention relate to the field of circulating cooling devices, and provide a hybrid cooling device and a circulating cooling water system. The hybrid cooling device includes a cylinder body, a cooling water inlet and a mixed water inlet are arranged on the cylinder body, a cooling water pipe communicated with the cooling water inlet and a mixed water pipe communicated with the mixed water inlet are installed on the cylinder body, and a spiral ring plate is further included, and the spiral ring plate is fixed in the cylinder body. For the hybrid cooling device and the circulating cooling water system provided by the present invention, the cooling water enters the cylinder body from the cooling water inlet through the cooling water pipe, and the mixed water enters the cylinder body from the mixed water inlet through the mixed water pipe. By means of the swirl strengthening effect of the spiral ring plate in the cylinder body, the convective heat transfer effect between the mixed water and the cooling water is enhanced, so as to significantly reduce the discharge temperature of the cooling water in the circulating water system and reduce the negative impact on the surrounding environment caused by the discharge of the cooling water.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of circulating cooling devices, and in particular to a hybrid cooling device and a circulating cooling water system. Background Art

[0002] A circulating cooling water system is a water supply system that cools the cooling water after heat exchange and then recycles it. It is an important part of the steam power system of nuclear (thermal) power plants. At present, for the circulating water systems of nuclear (thermal) power plants near flowing water sources such as the ocean or rivers, a direct circulating cooling method is usually adopted. Cold water is directly pumped from the ocean or river basin and transported to the cooling water inlet of the condenser of the steam turbine generator set. The hot water heated by steam after heat exchange is discharged into the external environment.

[0003] During the continuous operation of the above direct circulating cooling system, the continuous discharge of a large amount of heated cooling water will cause thermal pollution and have an adverse impact on the ecological environment around the power plant. In addition, the cooling load and the cooling water volume affect the discharge temperature of the cooling water in the circulating water system of nuclear (thermal) power plants. When the load is certain, increasing the supply of cooling water volume can reduce the discharge temperature of the cooling water. However, excessive supply of cooling water will cause an increase in the degree of subcooling and the oxygen content of the condensate in the condenser, affect the water quality of the steam-water circulation loop and reduce the system reliability, or cause an increase in the steam supply load of the deaerator and reduce the thermal efficiency of the power plant. Summary of the Invention

[0004] The purpose of the present invention is to provide a hybrid cooling device and a circulating cooling water system to solve the problems that the cooling water discharged from the existing circulating cooling water system has a high temperature, causing thermal pollution and low thermal efficiency of the power plant.

[0005] To solve the above technical problems, the present invention provides a hybrid cooling device, including a cylinder body, a cooling water inlet and a mixed water inlet are arranged on the cylinder body, a cooling water pipe communicated with the cooling water inlet and a mixed water pipe communicated with the mixed water inlet are installed on the cylinder body, and a spiral ring plate is further included, and the spiral ring plate is fixed inside the cylinder body.

[0006] Wherein, the cooling water pipe and the mixed water pipe respectively form an acute angle with the central axis of the cylinder body.

[0007] Wherein, the cooling water pipe forms an angle of 60° to 75° with the central axis of the cylinder body, and the mixed water pipe forms an angle of 60° to 75° with the central axis of the cylinder body.

[0008] Wherein, an outlet is arranged at the bottom of the cylinder body, the outlet is communicated with a water outlet pipe, and the cross-sectional area of the water outlet pipe is not less than the sum of the cross-sectional areas of the cooling water pipe and the mixed water pipe.

[0009] Wherein, the inner ring surface diameter of the spiral ring plate is equal to the pipe diameter of the water outlet pipe, the outer ring surface diameter of the spiral ring plate is equal to the inner diameter of the cylinder body, and the height of the spiral ring plate is equal to the height of the cylindrical section in the cylinder body.

[0010] Wherein, the included angle between the longitudinal section of the spiral ring plate and the central axis of the cylinder body is an acute angle.

[0011] Wherein, the included angle between the longitudinal section of the spiral ring plate and the central axis of the cylinder body is 60° to 75°.

[0012] Wherein, the cylinder body is fixedly connected with a limiting member extending along the axial direction of the cylinder body, a ring-shaped support plate is fixedly installed at the bottom of the cylinder body, the top end surface of the spiral ring plate abuts against the limiting member, the bottom of the spiral ring plate abuts against the support plate, and the bottom end surface of the spiral ring plate abuts against a second limiting member installed on the support plate.

[0013] To solve the above technical problems, the present invention also provides a circulating cooling water system, including a cooling branch, a mixing branch and the mixing and cooling device as described above. The cooling branch and the mixing branch are arranged in parallel, the cooling branch is communicated with the cooling water pipeline, and the mixing branch is communicated with the mixed water pipeline.

[0014] Wherein, a condenser is further included, the condenser is installed on the cooling branch, a cooling branch regulating valve is installed at the water inlet of the condenser, and a mixing branch regulating valve is installed on the mixing branch.

[0015] For the mixing and cooling device and the circulating cooling water system provided by the present invention, the cooling water enters the cylinder body from the cooling water inlet through the cooling water pipeline, and the mixed water enters the cylinder body from the mixed water inlet through the mixed water pipeline. By means of the swirl strengthening effect of the spiral ring plate in the cylinder body, the convective heat transfer effect between the mixed water and the cooling water is enhanced, thereby significantly reducing the cooling water discharge temperature of the circulating water system and reducing the negative impact on the surrounding environment caused by the cooling water discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a three-dimensional view of the mixing and cooling device according to the embodiment of the present invention;

[0018] Figure 2 is Figure 1 a side view of the shown mixing and cooling device;

[0019] Figure 3 is Figure 2 A sectional view of the shown hybrid cooling device along A-A;

[0020] Figure 4 is Figure 3 A perspective view of the spiral ring plate shown in

[0021] Figure 5 is Figure 3 A schematic structural view of the upper end cover shown in

[0022] Figure 6 is Figure 3 A top view of the support plate shown in

[0023] Figure 7 A schematic structural view of the circulating cooling water system according to an embodiment of the present invention.

[0024] In the figure: 100, hybrid cooling device; 101, cylinder body; 102, spiral ring plate; 103, cylindrical section; 104, conical section; 105, limiting member; 106, support plate; 107, second limiting member; 108, outer shell; 109, upper end cover; 110, cooling water pipe; 120, mixed water pipe; 130, water outlet pipe; 140, cooling branch; 141, cooling branch regulating valve; 150, mixing branch; 151, mixing branch regulating valve; 160, condenser; 170, suction port; 171, suction port opening and closing valve; 180, water pump; 190, discharge port; 191, discharge pipe; 192, discharge port opening and closing valve. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "first" and "second" are used for numbering the product components for clear description and do not represent any substantial difference. The directions of "up", "down", "left" and "right" are subject to the directions shown in the drawings. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" 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 mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Figure 1 is a perspective view of the hybrid cooling device according to an embodiment of the present invention; Figure 2 is Figure 1 a side view of the hybrid cooling device shown; Figure 3 is Figure 2 a cross-sectional view of the hybrid cooling device shown along A-A. As Figure 1-3 shown, the hybrid cooling device 100 includes a cylinder 101 and a spiral ring plate 102, and the spiral ring plate 102 is fixed inside the cylinder 101. A cooling water inlet and a mixed water inlet are provided on the cylinder 101. Among them, the structure of the spiral ring plate 102 is specifically as Figure 4 shown.

[0029] For the hybrid cooling device provided by the embodiment of the present invention, the spiral ring plate 102 is fixed and installed inside the cylinder 101 by spot welding or with the help of other auxiliary installation components. After the cooling water and the mixed water enter from the cooling water inlet and the mixed water inlet respectively, the convective heat transfer effect between the two is enhanced by means of the swirl strengthening effect of the spiral ring plate 102, thereby significantly reducing the discharge temperature of the cooling water in the circulating water system and reducing the negative impact on the surrounding environment caused by the discharge of the cooling water.

[0030] Among them, as Figure 1 shown, the cylinder 101 is installed with a cooling water pipe 110 communicating with the cooling water inlet and a mixed water pipe 120 communicating with the mixed water inlet. The cooling water pipe 110 and the mixed water pipe 120 form an acute angle with the central axis of the cylinder 101 respectively. The cooling water pipe 110 is connected to the cold water inlet through a cooling water flange; the mixed water pipe 120 is connected to the mixed water inlet through a mixed water flange. When the cooling water and the mixed water flow into the cylinder 101 along the pipes inclined upward relative to the cylinder 101 respectively, the impact between the cooling water and the mixed water is more obvious, enhancing the uniformity of mixing and the cooling effect of the cooling water and the mixed water. At the same time, the cooling water and the mixed water flowing into the cylinder 101 along the inclined pipes can effectively reduce the impact of the water flow on the cylinder 101 and extend the service life of the entire device.

[0031] Specifically, the cooling water pipe 110 forms an angle of 60° to 75° with the central axis of the cylinder 101, and the mixed water pipe 120 forms an angle of 60° to 75° with the central axis of the cylinder 101. For example, the included angle between the cooling water pipe 110 and the central axis of the cylinder 101 is 70°, and the included angle between the mixed water pipe 120 and the central axis of the cylinder 101 is 60°. Of course, the included angle between the cooling water pipe 110 and the central axis of the cylinder 101 can also be 60°, 65°, or any angle between 60° and 75°. Similarly, the included angle between the mixed water pipe 120 and the central axis of the cylinder 101 can be 65°, 70°, or any angle between 60° and 75°.

[0032] Among them, as Figure 3 shown, an outlet is provided at the bottom of the cylinder 101. The outlet is connected to the water outlet pipe 130. The water outlet flange of the water outlet pipe 130 is connected to the bottom of the cylinder 101. The end of the water outlet pipe 130 away from the cylinder 101 is connected to the discharge pipe. The inner ring surface diameter of the spiral ring plate 102 is equal to the pipe diameter of the water outlet pipe 130, the outer ring surface diameter of the spiral ring plate 102 is equal to the inner diameter of the cylinder 101, and the height of the spiral ring plate 102 is equal to the height of the cylindrical section of the cylinder 101. In the mixing and cooling device provided by the embodiment of the present invention, the spiral ring plate 102 is correspondingly arranged in the cylindrical section of the cylinder 101. The outer ring surface diameter of the spiral ring plate 102 is basically the same as the inner diameter of the cylinder 101. It is fixedly installed inside the cylinder 101 by spot welding or clamping, etc. The inner ring surface diameter of the spiral ring plate 102 is the same as the pipe diameter of the water outlet pipe 130, so that the cooling water and the circulating water can be quickly discharged from the cylinder 101 after convective heat transfer.

[0033] In the embodiment of the present invention, the cylinder 101 includes a cylindrical section 103 and a conical section 104 connected to each other. The water outlet pipe 130 is installed at the small diameter end of the conical section 104. The large diameter end of the conical section 104 is connected to the cylindrical section 103. The cooling water pipe 110 and the mixed water pipe 120 are both arranged in the cylindrical section 103. For example, the cooling water pipe 110 and the mixed water pipe 120 are installed on the cylinder 101 by means of flanges or welding. When in use, as Figure 3 shown, the cylindrical section 103 is located above the conical section 104 in the vertical direction, and the water body flows downward under the action of gravity. In addition, the cylinder 101 can also be an ordinary cylindrical cylinder. At this time, the water outlet pipe 130 is connected to the water outlet at the bottom of the cylinder 101. Of course, the cylinder 101 can also be a square column or a structure of other shapes, and no specific limitation is made thereto. The mixing and cooling device provided by the embodiment of the present invention inclines to enter water from the top of the cylinder 101 and discharges water outward from the bottom of the cylinder 101, discharging the water flow by means of gravity, reducing the performance requirements for power components.

[0034] Among them, the cross-sectional area of the water outlet pipe 130 is not less than the sum of the cross-sectional areas of the cooling water pipe 110 and the mixed water pipe 120. In this way, the cooling water entering the cylinder body 101 from the cooling water pipe 110 and the mixed water entering from the mixed water pipe 120 can be quickly discharged from the water outlet pipe 130 after achieving uniform temperature through convective heat transfer in the cylinder body 101, avoiding water accumulation in the cylinder body 101.

[0035] As Figure 3 In the view angle shown, the included angle between the longitudinal section of the spiral ring plate 102 and the central axis of the cylinder body 101 is an acute angle. It should be noted that the longitudinal section of the spiral ring plate 102 refers to the section obtained by intercepting the spiral ring plate 102 with a plane extending from one end to the other end and passing through the central axis; the transverse section refers to the plane perpendicular to the longitudinal section.

[0036] Specifically, the included angle between the longitudinal section of the spiral ring plate 102 and the central axis of the cylinder body 101 is 60° to 75°. For example, the included angle between the longitudinal section of the spiral ring plate 102 and the central axis of the cylinder body 101 is 70°, and of course, it can also be 60°, 65° or any angle between 60° and 75°. Preferably, the included angles among the included angle between the longitudinal section of the spiral ring plate 102 and the central axis of the cylinder body 101, the included angle between the cooling water pipe 110 and the central axis of the cylinder body 101, and the included angle between the mixed water pipe 120 and the central axis of the cylinder body 101 are the same. The angles at which the cooling water flows in from the cooling water pipe 110 and the mixed water flows in from the mixed water pipe 120 are basically the same as the inclination angle of the spiral ring plate 102, which helps to reduce the impact of the water flow on the spiral ring plate 102 and extend the service life of the spiral ring plate 102.

[0037] In the embodiment of the present invention, the cylinder body 101 is fixedly connected to a limiting member 105 extending along the axial direction of the cylinder body 101. A ring-shaped support plate 106 is fixedly installed at the bottom of the cylinder body 101. The top end face of the spiral ring plate 102 abuts against the limiting member 105, the bottom of the spiral ring plate 102 abuts against the support plate 106, and the bottom end face of the spiral ring plate 102 abuts against a second limiting member 107 installed on the support plate 106. Thus, the spiral ring plate 102 is axially limited between the support plate 106 and the top of the cylinder body 101, avoiding the up and down movement of the spiral ring plate 102 driven by the water flow impact; the circumferential movement of the spiral ring plate 102 is limited between the limiting member 105 and the second limiting member 107, avoiding circumferential movement under the impact of the water flow.

[0038] Specifically, the cylinder body 101 includes an outer shell 108 and an upper end cover 109. The upper end cover 109 is bolted to the top of the outer shell 108 through an end cover flange, as Figure 5As shown, the limiting member 105 is welded or bolt-fixed to the upper end cover 109 and extends radially along the upper end cover 109. The support plate 106 is circumferentially spot-welded or fixed to the inner wall of the cylinder 101 in other ways. For example, the support plate 106 is fixed at the connection between the cylindrical section 103 and the conical section 104. The limiting member 105 and the second limiting member 107 can be rod-shaped or plate-shaped, and the upper and lower end faces of the spiral ring plate 102 are respectively abutted against the limiting member 105 and the second limiting member 107. The support plate 106 is an annular plate, the inner ring surface diameter of the support plate 106 is equal to the pipe diameter of the water outlet pipe 130, and the outer ring surface diameter of the support plate 106 is the same as the inner diameter of the cylinder 101. As Figure 6 shown, the second limiting member 107 extends along the diameter direction of the support plate 106 and is welded and fixed to the support plate 106. Among them, the outer shell 108 includes a connected cylindrical section 103 and a conical section 104, and the upper end cover 109 is installed at the end of the cylindrical section 103.

[0039] As Figure 7 shown, an embodiment of the present invention further provides a circulating cooling water system, including a cooling branch 140, a mixing branch 150, and the mixing and cooling device 100 as described above. The cooling branch 140 and the mixing branch 150 are arranged in parallel, the cooling branch 140 is communicated with the cooling water pipe 110, and the mixing branch 150 is communicated with the mixed water pipe 120. Among them, both the cooling branch 140 and the mixing branch 150 are laid by pipes, and the two are arranged in parallel. The ends of the cooling branch 140 and the mixing branch 150 are both connected to the mixing and cooling device 100.

[0040] The circulating cooling water system provided by the embodiment of the present invention uses the spiral ring plate 102 in the mixing and cooling device 100 to improve the cooling effect of the cooling water heated by the condenser, reduce the temperature of the discharged cooling water, and thus reduce the negative impact of the cooling water on the surrounding environment.

[0041] On the basis of the above embodiment, the circulating cooling water system further includes a condenser 160. The condenser 160 is installed on the cooling branch 140, and a cooling branch regulating valve 141 is installed at the water inlet of the condenser 160, and a mixing branch regulating valve 151 is installed on the mixing branch 150. By adjusting the opening degrees of the cooling branch regulating valve 141 and the mixing branch regulating valve 151, the ratio of the mixed water and the cooling water can be adjusted. The cooling water flow can be adjusted by means of the cooling branch regulating valve 141, and specifically adjusted according to the heat load of the condenser 160 and the operating parameter requirements of the condensation side of the condenser 160.

[0042] Based on the above embodiments, the circulating cooling water system further includes a suction port 170 and a suction port opening and closing valve 171 installed at the suction port 170. A water pump 180 is also installed on the connecting pipeline between the suction port 170 and the condenser 160. The cooling branch 140 and the mixing branch 150 are arranged in parallel between the water pump 180 and the mixing and cooling device 100. The cooling branch regulating valve 141 is installed between the condenser 160 and the water pump 180, and the mixing branch regulating valve 151 is installed between the water pump 180 and the mixing and cooling device 100. The circulating cooling water system further includes a discharge port 190 and a discharge pipe 191 connecting the discharge port to the mixing and cooling device 100. A discharge port opening and closing valve 192 is installed on the discharge pipe 191.

[0043] During system operation, both the suction port opening and closing valve 171 and the discharge port opening and closing valve 192 are in the open state. The water pump 180 extracts cooling water from the suction port 170 and delivers it to the cooling branch 140 and the mixing branch 150 respectively. The two fluid streams are fully mixed in the mixing and cooling device 100, and are discharged to the external environment through the discharge pipe 191 and the discharge port 190. In order to ensure the normal operation of the condenser 160 and make the discharge temperature of the cooling water meet the environmental protection standards, it is necessary to adjust the opening degrees of the cooling branch regulating valve 141 and the mixing branch regulating valve 151 according to the target temperature of the cooling water in the discharge pipe 191, combined with the water temperature of the cooling water in the cooling branch 140 and the mixed water temperature in the mixing branch 150, to adjust the supply ratio of the two fluid streams, and then adjust the rotational speed of the water pump 180 to control the cooling water volume passing through the condenser 160 to meet the actual cooling water volume requirements under the corresponding working conditions. Thus, the normal cooling function of the circulating cooling water system can be ensured, and the discharge temperature of the cooling water can meet the relevant standard requirements.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid cooling device, comprising a cylinder body, on which a cooling water inlet and a mixed water inlet are provided. The cylinder body is equipped with a cooling water pipe communicated with the cooling water inlet and a mixed water pipe communicated with the mixed water inlet. Characterized in that, it further comprises a spiral ring plate, which is fixed inside the cylinder body. An outlet is provided at the bottom of the cylinder body, and the outlet is communicated with a water outlet pipe. The cross-sectional area of the water outlet pipe is not less than the sum of the cross-sectional areas of the cooling water pipe and the mixed water pipe; the outer ring surface diameter of the spiral ring plate is equal to the inner diameter of the cylinder body, and the inner ring surface diameter of the spiral ring plate is consistent with the pipe diameter of the water outlet pipe. The cooling water pipe and the mixed water pipe respectively form an acute angle with the central axis of the cylinder body; the longitudinal section of the spiral ring plate forms an acute angle with the central axis of the cylinder body; the angle between the longitudinal section of the spiral ring plate and the central axis of the cylinder body, the angle between the cooling water pipe and the central axis of the cylinder body, and the angle between the mixed water pipe and the central axis of the cylinder body are the same. The cooling water pipe forms an angle of 60° to 75° with the central axis of the cylinder body, and the mixed water pipe forms an angle of 60° to 75° with the central axis of the cylinder body.

2. The hybrid cooling device according to claim 1, Characterized in that, the height of the spiral ring plate is equal to the height of the cylindrical section in the cylinder body.

3. The hybrid cooling device according to claim 1, Characterized in that, the angle between the longitudinal section of the spiral ring plate and the central axis of the cylinder body is 60° to 75°.

4. The hybrid cooling device according to any one of claims 1, Characterized in that, the cylinder body is fixedly connected with a limiting member extending along the axial direction of the cylinder body. A ring-shaped support plate is fixedly installed at the bottom of the cylinder body. The top end face of the spiral ring plate abuts against the limiting member, the bottom of the spiral ring plate abuts against the support plate, and the bottom end face of the spiral ring plate abuts against a second limiting member installed on the support plate.

5. A circulating cooling water system, Characterized in that, it comprises a cooling branch, a mixing branch and the hybrid cooling device according to any one of claims 1 to 4. The cooling branch and the mixing branch are arranged in parallel. The cooling branch is communicated with the cooling water pipe, and the mixing branch is communicated with the mixed water pipe.

6. The circulating cooling water system according to claim 5, Characterized in that, it further comprises a condenser, which is installed on the cooling branch. A cooling branch regulating valve is installed at the water inlet of the condenser, and a mixing branch regulating valve is installed on the mixing branch.

Images