CN114288826A - A kind of height difference overflow water replenishment method of multi-stage waste gas spray tower - Google Patents

Abstract

The invention discloses a height difference overflow replenishment method for a multi-stage waste gas spray tower. The multi-stage waste gas spray tower comprises a spray device, at least n liquid distribution devices located above the spray device, for A water replenishing device for replenishing water to the topmost said liquid distribution device, a liquid level monitoring device for monitoring the liquid level in the spray device, and a control device for signal connection with the liquid level monitoring device and the water replenishing device; It includes the following steps: the liquid level monitoring device monitors the liquid level in the circulating storage tank in real time and converts it into a liquid level signal and sends it to the control device, and the control device receives the liquid level signal and communicates with the liquid level signal. The preset liquid level threshold in the control device is compared; when the result of the comparison is that the received liquid level signal is less than the preset liquid level threshold, the control device sends a water replenishment signal to the water replenishment device; the water replenishment device Receiving the water replenishment signal and replenishing water to the annular storage tank in the uppermost liquid distribution device.

Description

A kind of height difference overflow water replenishment method of multi-stage waste gas spray tower

technical field

The invention belongs to the technical field of waste gas treatment, and in particular relates to a method for replenishing water with a height difference overflow of a multi-stage waste gas spray tower.

Background technique

Textile finishing, electronic chips, lithium battery manufacturing and other industries often need to use organic solvents that are easily absorbed by water, such as DMF, DMAC, NMP, etc. After drying at high temperature, these solvents will be discharged together with the exhaust gas. If not dealt with, it is bound to have a very bad impact on the environment.

There have been devices to solve such problems in the prior art, such as using a recovery spray tower to spray the waste gas to absorb the solvent that is easily soluble in water in the waste gas, but the existing recovery tower is replenished with water through a float valve, or electrical Control liquid level height is controlled by pneumatic valve. The floating ball valve will leak water and the gasket will be aged for a long time, resulting in out of control of water replenishment; the electrical control liquid level usually has the situation of sensor corrosion, impossibility to dirt, ball valve leakage, solenoid valve failure, etc.; and the existing spray tower The energy consumption of the working process is high.

SUMMARY OF THE INVENTION

In view of this, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a height difference overflow replenishment method for a multi-stage waste gas spray tower, which can effectively reduce energy consumption and equipment failure rate.

In order to achieve the above object, the present invention adopts the following technical scheme:

A method for replenishing water with height difference overflow of a multi-stage waste gas spray tower, wherein the multi-stage waste gas spray tower comprises a spray device, at least n liquid distribution devices located above the spray device, and used for sending to the uppermost A water replenishing device for replenishing water in the liquid distribution device, a liquid level monitoring device for monitoring the liquid level in the spraying device, and a control device signally connected to the liquid level monitoring device and the water replenishing device, the spraying device The device includes a circulating storage tank, a spray assembly, and a first water pump used to transport the liquid in the circulating storage tank to the spray assembly; the liquid distribution device includes an annular storage tank, a liquid distribution assembly, and a The liquid in the annular storage tank is transported to the second water pump in the liquid distribution assembly;

The high-difference overflow replenishment method includes the following steps: the liquid level monitoring device monitors the liquid level in the circulating storage tank in real time and converts it into a liquid level signal and sends it to the control device, and the control device receives the liquid level. The liquid level signal is compared with the preset liquid level threshold in the control device;

When the result of the comparison is that the received liquid level signal is less than the preset liquid level threshold, the control device sends a water replenishment signal to the water replenishment device; the water replenishment device receives the water replenishment signal and sends it to the uppermost The water is replenished in the annular reservoir in the liquid distribution device. When replenishing water, it is only necessary to replenish water to the top liquid distribution device, and then continue to overflow downwards, which can not only further improve the absorption effect, but also effectively reduce energy consumption.

The storage tank of the traditional sprinkler head is set at the bottom of the tower, which makes the storage tank crowded and difficult to manufacture above the fourth level, and the energy consumption is high. In this application, the structure of the storage tank is changed, and the water replenishment method of the float ball is cancelled, and all the liquid levels of the whole system can be controlled only by detecting the liquid level height of the lowermost circulating storage tank.

According to some preferred implementation aspects of the present invention, the annular storage tank in the uppermost liquid distribution device receives the liquid delivered by the water replenishing device, and the liquid level in the annular storage tank continuously rises and overflows, and the overflowed liquid It continuously flows from the upper liquid distribution device to the lower liquid distribution device, fills the annular storage tank in the lower liquid distribution device in turn, and finally flows to the circulation storage tank in the lowermost spray device.

According to some preferred implementation aspects of the present invention, when the result of the comparison is that the received liquid level signal is greater than the preset liquid level threshold, the control device does not send a water replenishment signal, and the water replenishment device does not act.

According to some preferred implementation aspects of the present invention, the n is a natural number greater than or equal to 2.

According to some preferred implementation aspects of the present invention, the n is a natural number greater than or equal to 5. With the water collection and water replenishment structure in the present application, n can be greater than or equal to 5, that is, the overall level of the spray tower can reach 6 and above.

According to some preferred implementation aspects of the present invention, a packing layer and a liquid collector are arranged below the liquid distribution assembly, the liquid collector is arranged below the packing layer, and the annular reservoir is arranged on the liquid collector between the periphery of the device and the wall of the spray tower.

According to some preferred implementation aspects of the present invention, the top of the annular reservoir in the liquid distribution device is flush with or lower than the bottom of the corresponding liquid collector. The liquid collector can only allow the gas to pass through from the bottom, and prevent the liquid from falling down, so that the liquid in the liquid distribution device cannot flow down through the liquid collector, but can only flow down through the overflow of the annular reservoir.

According to some preferred implementation aspects of the present invention, the multi-stage exhaust gas spray tower includes a demisting layer, and the demisting layer is located above the topmost liquid distribution device.

According to some preferred implementation aspects of the present invention, the second water pump is used to transport the liquid in the annular storage tank to the corresponding liquid distribution component for liquid distribution.

According to some preferred implementation aspects of the present invention, the spraying device of the multi-stage exhaust gas spraying tower includes an intake pipe, the intake pipe is used to pass the exhaust gas into the spraying device, and the intake pipe One end of the sprayer is located directly below the spray assembly, and the air inlet is set downward to improve the absorption effect. More preferably, the axis line of the air inlet corresponds to the axis line of the spray assembly.

Compared with the prior art, the advantages of the present invention are: the height difference overflow replenishment method of the multi-stage waste gas spray tower of the present invention, by setting a corresponding storage tank in each spray device or liquid distribution device And the water pump, the storage tank can receive the liquid left above, and the water pump is used to pump the liquid in the storage tank to the corresponding sprinkler or liquid distributor, eliminating the traditional large tank at the bottom and realizing the self-circulation of the liquid , when replenishing water, you only need to replenish water to the top liquid distribution device, and then continue to overflow downwards, which can not only further improve the absorption effect, but also effectively reduce energy consumption and equipment failure rates.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of multistage waste gas spray tower in the preferred embodiment of the present invention;

Fig. 2 is the schematic diagram of gas path and water path when the multi-stage waste gas spray tower is working in the preferred embodiment of the present invention;

Wherein, the reference numerals include: the first circulating storage tank-11, the first sprinkler-12, the first circulating water pump-13, the second annular storage tank-21, the second liquid distributor-22, the second circulating water pump -23, the second packing layer-24, the second liquid collector-25, the third annular storage tank-31, the third liquid distributor-32, the third circulating water pump-33, the third packing layer-34, the third Liquid collector-35, fourth annular storage tank-41, fourth liquid distributor-42, fourth circulating water pump-43, fourth packing layer-44, fourth liquid collector-45, fifth annular storage tank- 51, the fifth liquid distributor-52, the fifth circulating water pump-53, the fifth packing layer-54, the fifth liquid collector-55, the sixth annular storage tank-61, the sixth liquid distributor-62, the sixth Circulating water pump-63, sixth packing layer-64, sixth liquid collector-65, defogging layer-7, intake pipe-8, liquid level detection device-9.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, 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 implementation Examples are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

1-2, the multi-stage exhaust gas spray tower in this embodiment includes a spray device, 5 liquid distribution devices located above the spray device, and a defogging layer 7 located above the topmost liquid distribution device. A water replenishment device for replenishing water to the topmost liquid distribution device, a control device for controlling the action of the water replenishment device, and a liquid level detection device 9 corresponding to the spray device, the control device is signally connected to the liquid level detection device and the water replenishment device.

The spraying device in this application includes a circulating storage tank, a spraying assembly, and a first water pump for transporting the liquid in the circulating storage tank to the spraying assembly; the liquid distribution device includes an annular storage tank, a liquid distribution assembly, and is used for The liquid in the annular storage tank is transported to the second water pump in the liquid distribution assembly, the packing layer and the liquid collector located under the liquid distribution assembly. Between the perimeter and the wall of the spray tower. The second water pump is used to transport the liquid in the annular storage tank to the corresponding liquid distribution component for liquid distribution.

When replenishing water, it is only necessary to replenish water to the top liquid distribution device, and then continue to overflow downwards, which can not only further improve the absorption effect, but also effectively reduce energy consumption. The top of the annular reservoir in the liquid distribution device is flush with or lower than the bottom of the corresponding liquid collector. The liquid collector can only allow the gas to pass through from the bottom, and prevent the liquid from falling down, so that the liquid in the liquid distribution device cannot flow down through the liquid collector, but can only flow down through the overflow of the annular reservoir.

Specifically, the (first stage) spraying device in this embodiment includes a first circulating storage tank 11, a first sprayer 12 and a first circulating water pump 13, and the (second) second stage liquid distribution device includes a second annular storage tank 13. The tank 21, the second liquid distributor 22, the second circulating water pump 23, the second packing layer 24, the second liquid collector 25, and the (third) third-stage liquid distribution device includes the third annular storage tank 31, the third liquid distributor 32. The third circulating water pump 33, the third packing layer 34, the third liquid collector 35, (the) fourth-stage liquid distribution device includes the fourth annular storage tank 41, the fourth liquid distributor 42, the fourth circulating water pump 43, The fourth packing layer 44, the fourth liquid collector 45, and the fifth-stage liquid distribution device include the fifth annular storage tank 51, the fifth liquid distributor 52, the fifth circulating water pump 53, the fifth packing layer 54, the fifth The liquid collector 55 , the sixth-stage liquid distribution device includes a sixth annular storage tank 61 , a sixth liquid distributor 62 , a sixth circulating water pump 63 , a sixth packing layer 64 , and a sixth liquid collector 65 . The water replenishing device communicates with the sixth annular storage tank 61 at the top.

The storage tank of the traditional sprinkler head is set at the bottom of the tower, which makes the storage tank crowded and difficult to manufacture above the fourth level, and the energy consumption is high. In this application, the structure of the storage tank is changed, and the water replenishment method of the float ball is cancelled, and all the liquid levels of the whole system can be controlled only by detecting the liquid level height of the lowermost circulating storage tank.

The spray device in this embodiment includes an air intake duct 8, which is used to pass exhaust gas into the spray device, and one end of the air intake duct is located directly below the spray assembly, and the air inlet faces downward setting to improve absorption. More preferably, the axis line of the air inlet corresponds to the axis line of the spray assembly.

Through the above water collection and water replenishment structure, the multi-stage waste gas spray tower of the present invention can realize that the overall level of the spray tower can reach 6 and above.

In the multi-stage exhaust gas spray tower of this embodiment, by setting a corresponding storage tank and a water pump in each spray device or liquid distribution device, the storage tank can receive the liquid left above, and the water pump is used to transfer the liquid in the storage tank. The liquid is pumped to the corresponding sprinkler or liquid distributor, eliminating the traditional large pool at the bottom and realizing the self-circulation of the liquid. When replenishing water, it is only necessary to replenish water to the top liquid distribution device, and then continue to overflow downwards, which can not only further improve the absorption effect, but also effectively reduce energy consumption and equipment failure rate.

Example 2

The present embodiment provides a method for replenishing water with height difference overflow based on the multi-stage waste gas spray tower in Embodiment 1, which specifically includes the following steps:

1) According to the structure in Example 1, a multi-stage waste gas spray tower is manufactured or modified.

2) When the spray tower is working, the liquid level monitoring device monitors the liquid level in the circulating storage tank in real time and converts it into a liquid level signal and sends it to the control device.

3) The control device receives the liquid level signal and compares it with the preset liquid level threshold in the control device.

4) When the result of the comparison is that the received liquid level signal is less than the preset liquid level threshold, the control device sends a water replenishment signal to the water replenishment device; Hydrate in. When replenishing water, it is only necessary to replenish water to the top liquid distribution device, and then continue to overflow downwards, which can not only further improve the absorption effect, but also effectively reduce energy consumption.

Or, when the result of the comparison is that the received liquid level signal is greater than the preset liquid level threshold, the control device does not send the water replenishment signal, and the water replenishment device does not act.

5) The annular storage tank in the top liquid distribution device receives the liquid delivered by the water replenishment device, the liquid level in the annular storage tank continuously rises and overflows, and the overflowing liquid is continuously sent from the upper liquid distribution device to the lower one. The liquid distribution device flows, fills the annular reservoir in the lower liquid distribution device in turn, and finally flows to the circulation reservoir in the lowermost spray device.

The liquid level of the circulating storage tank in the lowermost sprinkler device keeps rising. When the result of the comparison is that the received liquid level signal is greater than the preset liquid level threshold, the control device does not send a water replenishment signal, and the water replenishment device does not act. .

The multi-stage waste gas spray tower of the present invention is provided with an annular water storage tank in the circumferential direction of the liquid collector of each stage, and the original bottom water tank is eliminated. The circulating liquid in the annular storage tank is directly transported to the corresponding spray or liquid distributor through the corresponding water pump of each stage. Full contact absorption. The circulating liquid is finally collected by the annular storage tank, overflows and then flows into the annular storage tank below, and the above process is repeated. When the liquid concentration in the first-stage circulating storage tank at the bottom reaches the set target, the high-concentration aqueous solution is discharged, and the liquid level decreases. The liquid level sensor detects that the liquid level is lower than the set value, and the control device controls the water replenishment device to open the water replenishment pneumatic ball valve. . The tap water is replenished into the annular storage tank of the highest liquid distribution device. After the upper annular storage tank is filled up, the liquid overflows and automatically flows into the annular storage tank of the next layer. When the secondary annular storage tank is filled and falls into the first cycle, the liquid level of the first cycle pool can only rise. After the liquid level sensor detects that the liquid level reaches the set value, the pneumatic valve is closed to stop the water supply.

Compared with the prior art, the multi-stage waste gas spray tower of the present invention: (1) cancels the traditional floating ball replenishment method, and only needs to detect the height of the bottom first circulating liquid level to control all the liquid levels of the whole system; The original storage tank is at the bottom of the tower, which makes the storage tank crowded and difficult to make above the fourth level; (2) The external circulation storage tank is placed on the top to reduce the height difference between the spray and the storage tank, which can save water pump Yang (3) In the traditional recovery tower, N circulation needs to be equipped with N liquid level sensors and N pneumatic valves. This application only needs to control the liquid level height of one layer of circulating liquid to control the internal flow of the system. For all liquid levels, only one liquid level detection and one pneumatic valve need to be configured, which reduces the cost and failure rate by (N-1) times.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with the technology to understand the content of the present invention and implement it accordingly, and cannot limit the scope of protection of the present invention. Equivalent changes or modifications made in the spirit and spirit should all be included within the protection scope of the present invention.

Claims (10)

1. The height difference overflow water supplementing method of the multistage waste gas spray tower is characterized in that the multistage waste gas spray tower comprises a spray device, at least n liquid distribution devices positioned above the spray device, a water supplementing device used for supplementing water to the uppermost liquid distribution device, a liquid level monitoring device used for monitoring the liquid level in the spray device and a control device in signal connection with the liquid level monitoring device and the water supplementing device, wherein the spray device comprises a circulating storage pool, a spray assembly and a first water pump used for conveying liquid in the circulating storage pool to the spray assembly; the liquid distribution device comprises an annular storage pool, a liquid distribution assembly and a second water pump for conveying liquid in the annular storage pool to the liquid distribution assembly;

the head overflow water replenishing method comprises the following steps: the liquid level monitoring device monitors the liquid level in the circulating storage tank in real time, converts the liquid level into a liquid level signal and sends the liquid level signal to the control device, and the control device receives the liquid level signal and compares the liquid level signal with a preset liquid level threshold value in the control device;

when the received liquid level signal is smaller than a preset liquid level threshold value according to the comparison result, the control device sends a water supplementing signal to the water supplementing device; and the water supplementing device receives the water supplementing signal and supplements water to the uppermost annular storage pool in the liquid distribution device.

2. The method according to claim 1, wherein the annular reservoir in the uppermost liquid distribution device receives the liquid delivered by the water replenishing device, the liquid level in the annular reservoir rises continuously and overflows, and the overflowing liquid flows continuously from the upper liquid distribution device to the lower liquid distribution device, fills the annular reservoir in the lower liquid distribution device and finally flows to the circulating reservoir in the lowermost spraying device.

3. The method according to claim 2, wherein when the comparison result indicates that the received liquid level signal is greater than a preset liquid level threshold, the control device does not send a water replenishing signal, and the water replenishing device does not act.

4. The method for replenishing water by level difference overflow of claim 1, wherein n is a natural number greater than or equal to 2.

5. The method according to claim 4, wherein n is a natural number greater than or equal to 5.

6. The method according to claim 1, wherein a packing layer and a liquid collector are arranged below the liquid distribution assembly, the liquid collector is arranged below the packing layer, and the annular reservoir is arranged between the periphery of the liquid collector and the wall of the spray tower.

7. The method according to claim 6, wherein the top of the annular reservoir in the distributor is flush with or lower than the bottom of the corresponding liquid trap.

8. The method according to claim 1, wherein the multi-stage exhaust gas spray tower comprises a demisting layer, and the demisting layer is positioned above the topmost liquid distribution device.

9. The method according to any one of the preceding claims 1, wherein the second water pump is used for delivering the liquid in the annular reservoir to the corresponding liquid distribution assembly for liquid distribution.

10. The method for supplementing water by means of altitude difference overflow according to any one of claims 1 to 9, wherein the spraying device of the multistage exhaust gas spraying tower comprises an air inlet pipeline, the air inlet pipeline is used for introducing exhaust gas into the spraying device, and one end part of the air inlet pipeline is located right below the spraying assembly.

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