Desuperheating water recovery system for spraying cooling medium

Abstract

The invention provides a desuperheating water recovery system for spraying a cooling medium. The system comprises a process water device, a medium spraying cooling device and a desuperheating water recovery pipeline. Compared with a traditional medium cooling device, the cooling device is large in flow section, sufficient in heat exchange time and good in cooling effect, the cooling water amount does not need to be accurately controlled, the vast majority of liquid water can be recycled and reused except a small amount of liquid water flows into a system along with a medium, the consumption of process water is greatly reduced, and a good water-saving effect is achieved.

Description

Technical Field

[0001] The invention belongs to the field of water-saving control of a low-pressure medium spray cooling device and relates to a cooling water recovery system for a spray cooling medium. Background Art

[0002] In the traditional medium spray cooling device, the medium is cooled by directly opening a hole on the wall of the medium conveying pipeline, inserting a cooling water pipe, and arranging the spray nozzle downstream on the pipeline section. After the cooling water is sprayed to cool the medium, because the pipeline section is small and the droplets move quickly with the medium, the droplets are more likely to be sprinkled on the inner wall of the pipeline, making the mass transfer effect between the medium and water relatively small. In order to achieve the cooling effect, a large amount of cooling water must be sprayed. Generally, the cooling water sprayed is dozens of times the effective evaporation water consumption. The excess liquid cooling water flows into the system along the medium pipeline and cannot be recycled, resulting in a large amount of water consumption.

[0003] A large amount of cooling water enters the system, which eventually leads to an increase in the water balance pressure of the system, necessitating an increase in wastewater discharge, increasing the load on the wastewater treatment device, and increasing unnecessary energy consumption.

[0004] In this case, providing a device that can recycle cooling water by transforming the medium cooling system has become a technical demand that urgently needs to be solved in this field. Summary of the invention

[0005] The purpose of the present invention is to provide a cooling water recovery system for spray cooling medium to address the technical deficiencies of the low-pressure medium spray cooling system. The present invention has a good cooling effect, and most of the liquid cooling water can be recovered to the recovery water tank for secondary reuse, saving water and electricity.

[0006] The objective of the present invention is achieved through the following technical scheme: a cooling water recovery system for spraying cooling medium, the system comprising a high-temperature medium inlet pipe, a medium spray cooling device, a low-temperature medium outlet pipe, a cooling water inlet pipe, a cooling water recovery pipe, and a recovery water tank; wherein the medium spray cooling device comprises a box body, a cooling water spray pipe network, a medium uniform distribution pipe, and an observation manhole; the cooling water spray pipe network is located at the upper part of the box body, an atomizing nozzle is installed on the pipe network, and the cooling water inlet pipe is connected to the cooling water spray pipe network; the medium uniform distribution pipe is located at the lower part of the box body, and the high-temperature medium inlet pipe is connected to the medium uniform distribution pipe, so that the medium can be evenly distributed in the box body; the low-temperature medium outlet pipe is connected to the top of the box body; one end of the cooling water recovery pipe is connected to the bottom of the U-shaped pipe section of the high-temperature medium inlet pipe, and the other end is connected to the recovery water tank.

[0007] Furthermore, a manual valve, an electric switch valve, a self-operated pressure regulating valve and an on-site pressure gauge are provided on the cooling water inlet pipeline, and the pressure behind the regulating valve is manually adjusted to 0.2MPa on site.

[0008] Furthermore, the flow velocity of the medium flowing out of the box and the medium distribution pipe is less than 3m / s.

[0009] Furthermore, the medium distribution pipe is 0.5 to 1 m away from the bottom plate of the box.

[0010] Furthermore, the medium uniform distribution pipe sealing plate is 0.6 to 1 m away from the cooling water spray pipe network.

[0011] Furthermore, the cooling water spray pipe network is 1.5m away from the outlet pipe of the cooled medium.

[0012] Furthermore, the height between the lower edge of the outlet pipe of the cooled medium and the top plate of the box is 80 mm.

[0013] Furthermore, the cooling water spray pipe network is set differently according to the box diameter: if the box diameter is ≧DN1200, one layer of pipe network is set with 6 evenly distributed nozzles; if the box diameter is ≦DN1000, 1 to 3 layers of pipe network are set, with 1 nozzle in each layer in the center of the box, and the distance between nozzles in each layer is 500mm.

[0014] The beneficial effects of the present invention are as follows: the cooling water is sprayed downward through the nozzles of the spray pipe network on the box body, the high-temperature medium flows out from the surrounding of the medium uniform distribution pipe at the bottom of the box body, flows upward, and countercurrently contacts and exchanges heat with the cooling water sprayed downward, and the fully cooled medium flows out from the outlet pipe at the top of the box body to the medium system, and the excess liquid cooling water that has not evaporated flows from the bottom of the box body to the U-shaped section of the high-temperature medium inlet pipe, and then flows to the recovery water tank through the cooling water recovery pipe of the U-shaped water seal for secondary use. Compared with the direct installation of nozzles on the traditional pipeline, all cooling water directly enters the system with the medium, increasing the amount of wastewater discharged from the system. The cooling water recovery device of the present invention has a large box flow cross-section, a low medium flow rate, a large coverage area of ​​the sprayed cooling water, small droplets, a low droplet wall ratio, sufficient heat exchange time for the medium in the box, and a good cooling effect. After the high-temperature medium is cooled, except for the evaporated water and a very small amount of liquid water carried by the medium, most of the liquid water can be recycled for secondary use, reducing the pressure of the system water balance problem, and has a good prospect for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the present invention;

[0016] Figure 2 It is a schematic diagram of the medium uniform distribution pipe;

[0017] Figure 3 , Figure 4 This is a schematic diagram of the cooling water spray pipe network;

[0018] In the figure: high-temperature medium inlet pipeline 1, medium spray cooling device 2, box body 21, cooling water spray pipe network 22, medium uniform distribution pipe 23, observation manhole 24, medium outlet pipeline after cooling 3, cooling water inlet pipeline 4, manual valve 41, solenoid valve 42, self-operated pressure regulating valve 43, local pressure gauge 44, cooling water recovery pipeline 5, recovery water tank 6. DETAILED DESCRIPTION

[0019] The details of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] like Figure 1 As shown, the present invention is a cooling water recovery system for spraying cooling medium, including a high-temperature medium inlet pipeline 1, a medium spray cooling device 2, a medium outlet pipe 3 after cooling, a cooling water inlet pipeline 4, a cooling water recovery pipeline 5, and a recovery water tank 6. Among them, the medium spray cooling device 2 includes a box body 21, a cooling water spray pipe network 22, a medium uniform distribution pipe 23, and an observation manhole 24, and the cooling water inlet pipeline 4 includes a manual valve 41, a solenoid valve 42, a self-operated pressure regulating valve 43, and an on-site pressure gauge 44. Figure 2 The medium distribution pipe 23 is shown. Figure 3 , Figure 4 It is a cooling water spray pipe network 22.

[0021] The cooling water spray network 22 is located at the upper part of the box 21, 1.5m away from the top of the box. The inlet of the cooling water spray network 22 is connected to the cooling water inlet pipe 4. The cooling water spray network 22 is provided with different nozzle forms according to the diameter of the box; the medium uniform distribution pipe 23 is located at the lower part of the box 21, 0.5 to 1m away from the bottom of the box. Six rectangular holes are evenly distributed around the pipe, so that the high-temperature medium can flow out evenly from all sides, and the liquid water can flow to the lower U-shaped section after cooling; the cooling water recovery pipe 5 is located at the bottom of the U-shaped section of the high-temperature medium inlet pipe. The recovery pipe is made into a U-shaped water seal. The height of the water seal is determined according to the internal pressure of the medium. A manual drain valve is set at the bottom of the water seal, and the accumulated water can be drained during system maintenance; the outlet of the recovery pipe 5 is connected to the part above the liquid level of the recovery water tank 6. The vertical section less than 1m can be directly connected, and the top of the vertical section higher than 1m should be emptied or the pipe diameter should be increased to avoid siphon damage to the water seal and cause the medium to leak from the recovery water tank.

[0022] The working process of the present invention is as follows: the cooling water at room temperature passes through the cooling water inlet pipe 4, passes through the manual valve, the solenoid valve, and the self-operated pressure regulating valve to ensure that the pressure after the valve is not less than 0.2MPa, and is sent to the cooling water spraying pipe network 22 at the upper part of the box body, and is sprayed downward after being atomized by the atomizing nozzle. The high-temperature medium of 80-120°C flows upward from the high-temperature inlet pipe 1 through the medium uniform distribution pipe 23 at the lower part of the box body, and the flow rate is less than 3m / s, and contacts with the cooling water sprayed downward in countercurrent, fully exchanges heat, and cools the medium to 30-50°C. The cooled medium flows out from the top of the box body to the low-temperature medium outlet pipe 3, and is sent to the medium utilization system. Part of the cooling water evaporates into steam and flows into the low-temperature medium outlet pipe 3 together with the medium. The excess liquid cooling water that has not evaporated flows out from the bottom of the box body to the cooling water recovery pipe 5. The cooling water will be recovered by gravity to the recovery water tank 6 under the action of the height difference for secondary utilization.

Claims

1. A cooling water recovery system for spraying cooling medium, characterized in that: The system comprises: a high-temperature medium inlet pipe (1), a medium spray cooling device (2), a medium outlet pipe after cooling (3), a cooling water inlet pipe (4), a cooling water recovery pipe (5), and a recovery water tank (6). The medium spray cooling device (2) comprises a box body (21), a cooling water spray pipe network (22), a medium uniform distribution pipe (23), and an observation manhole (24); the cooling water inlet pipe (4) comprises a manual valve (41), a solenoid valve (42), a self-operated pressure regulating valve (43), and an on-site pressure gauge (44); the medium outlet pipe after cooling (3) is connected to the top of the box body (21), the cooling water inlet pipe (4) is connected to the cooling water spray pipe network (22), and the high-temperature medium inlet pipe (1) is connected to the medium uniform distribution pipe (23); one end of the cooling water recovery pipe (5) is connected to the lower part of the horizontal section of the high-temperature medium inlet pipe (1), and the end thereof is connected to the top of the recovery water tank (6).

2. The cooling water recovery system for spraying cooling medium according to claim 1, characterized in that: The cooling water spray pipe network (22) is equipped with an atomizing nozzle, and the diameter of the droplets can reach 50 microns; the height difference between the nozzle and the sealing plate of the medium uniform distribution pipe (23) is 0.6 to 1 meter; the distance from the nozzle to the lower edge of the cooling medium outlet pipe (3) is 1.5 meters; and the distance from the lower edge of the medium outlet pipe (3) to the top plate of the box body (21) is 80 mm.

3. The cooling water recovery system for spraying cooling medium according to claim 1, characterized in that: The medium uniform distribution pipe (23) is provided with a drainage port and air inlets uniformly distributed on all sides, and the height between the uniform distribution pipe sealing plate and the bottom plate of the box body is 0.5 to 1 m.

4. The cooling water recovery system for spraying cooling medium according to claim 1, characterized in that: The interface position between the lower portion of the horizontal section of the desuperheated water recovery pipe (5) and the high-temperature medium inlet pipe (1) must be 1 to 2 meters higher than the connection position at the top of the recovery water tank (6).

5. The cooling water recovery system for spraying cooling medium according to claim 1, characterized in that: The desuperheated water recovery pipe (5) must be made into a U-shaped water seal, wherein the water seal height is determined according to the static pressure of the high-temperature medium and is generally not less than 6 meters. The recovery water pipe can only have one low point, and a manual discharge valve is set at the low point.

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