CN114288826B - Height difference overflow water supplementing method of multi-stage waste gas spray tower - Google Patents

Abstract

The invention discloses a height difference overflow water replenishment method for a multi-stage exhaust gas spray tower. The multi-stage exhaust gas spray tower includes a spray device, at least n liquid distribution devices located above the spray device, and A water replenishing device for replenishing water into the uppermost liquid distribution device, a liquid level monitoring device for monitoring the liquid level in the spray device, and a control device signally connected to the liquid level monitoring device and the water replenishing device; The 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 signal and communicates with the liquid level signal. The preset liquid level threshold in the control device is compared; when the comparison result 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 Receive the water replenishment signal and replenish water into the annular storage tank in the uppermost liquid distribution device.

Description

A method for replenishing water with height difference overflow of multi-stage exhaust gas spray tower

Technical field

The invention belongs to the technical field of waste gas treatment, and specifically relates to a height difference overflow water replenishment method of a multi-stage waste gas spray tower.

Background technique

Textile finishing, electronic chip, lithium battery manufacturing and other industries often use organic solvents such as DMF, DMAC, and NMP that are easily absorbed by water. After high-temperature drying, these solvents will be discharged with the exhaust gas. If left untreated, it will have a very bad impact on the environment.

Devices to solve such problems have appeared in the existing technology, such as using a recovery spray tower to spray the exhaust gas and absorb the water-soluble solvents in the exhaust gas. However, the existing recovery tower replenishes water through a float valve or electrically. The liquid level is controlled via a pneumatic valve. Over time, the float valve will suffer from leakage of the float and aging of the sealing gasket, resulting in loss of control of water replenishment; electrically controlled liquid levels usually suffer from sensor corrosion, intolerance to dirt, ball valve leakage, solenoid valve failure, etc.; and the existing spray tower The energy consumption of the working process is high.

Contents of the invention

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

In order to achieve the above objects, the present invention adopts the following technical solutions:

A method for replenishing water by height difference overflow in a multi-stage exhaust gas spray tower. The multi-stage exhaust gas spray tower includes a spray device, at least n liquid distribution devices located above the spray device, and a liquid distribution device for distributing water to the uppermost part of the exhaust gas spray tower. A water replenishing device for replenishing water in the liquid distribution device, a liquid level monitoring device for monitoring the liquid level in the spray device, and a control device signally connected to the liquid level monitoring device and the water replenishing device. The device includes a circulating storage tank, a spray assembly and a first water pump for transporting 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 first water pump for transferring the liquid to the spray assembly. The liquid in the annular storage pool is transported to the second water pump in the liquid distribution assembly;

The height difference overflow water 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 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 water replenishment device. Replenish water in the annular reservoir in the liquid distribution device. When replenishing water, you only need to add water to the uppermost 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 build above the fourth level, and the energy consumption is high. In this application, the storage tank structure is changed, and the float replenishment method is eliminated. All liquid levels in the entire system can be controlled by simply detecting the liquid level of the lowest 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. The liquid level in the annular storage tank continues to rise and overflows, and the overflowing liquid It continuously flows from the upper liquid distribution device to the lower liquid distribution device, and is sequentially filled into the annular storage tank in the lower liquid distribution device, 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 comparison result 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, n is a natural number greater than or equal to 2.

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

According to some preferred implementation aspects of the present invention, a filler layer and a liquid collector are provided below the liquid distribution assembly, the liquid collector is provided below the filler layer, and the annular storage tank is provided below the liquid collector. between the perimeter of the vessel and the wall of the spray tower.

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

According to some preferred implementation aspects of the present invention, the multi-stage exhaust gas spray tower includes a mist removal layer, and the mist removal 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 reservoir to the corresponding liquid distribution assembly for liquid distribution.

According to some preferred implementation aspects of the present invention, the spray device of the multi-stage exhaust gas spray tower includes an air inlet pipe, the air inlet pipe is used to pass exhaust gas into the spray device, and the air inlet pipe One end is located directly below the spray component, 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 benefit of the present invention is that the height difference overflow replenishment method of the multi-stage exhaust gas spray tower of the present invention is achieved by arranging a corresponding storage tank in each spray device or liquid distribution device. and a water pump. The storage pool can receive the liquid left above. The water pump is used to pump the liquid in the storage pool to the corresponding sprinkler or liquid distributor, eliminating the traditional large pool at the bottom and realizing self-circulation of the liquid. , when replenishing water, you only need to replenish water to the uppermost liquid distribution device, and then continuously overflow downwards, which can not only further improve the absorption effect, but also effectively reduce energy consumption and equipment failure rate.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the 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 based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a multi-stage exhaust gas spray tower in a preferred embodiment of the present invention;

Figure 2 is a schematic diagram of the gas path and water path of the multi-stage exhaust gas spray tower during operation in the preferred embodiment of the present invention;

Among them, the reference numbers include: first circulating storage tank-11, first sprinkler-12, first circulating water pump-13, second annular storage tank-21, second liquid distributor-22, 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, defogger layer-7, air inlet pipe-8, liquid level detection device-9.

Detailed ways

In order to enable those skilled in the art to 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described implementation The examples are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of the present invention.

Example 1

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

The spray device in this application includes a circulating storage tank, a spray assembly, and a first water pump for transporting 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 packing layer and the liquid collector located below the liquid distribution assembly. The liquid collector is arranged below the packing layer, and the annular storage tank is arranged above the liquid collector. Between the perimeter and the spray tower wall. The second water pump is used to transport the liquid in the annular reservoir to the corresponding liquid distribution component for liquid distribution.

When replenishing water, you only need to add water to the uppermost 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 gas to pass upward from below, but prevents liquid from falling downward, so that the liquid in the liquid distribution device cannot flow downward through the liquid collector and can only flow downward through the overflow of the annular storage tank.

Specifically, the (first-level) spray device in this embodiment includes a first circulating storage tank 11, a first sprinkler 12 and a first circulating water pump 13, and the (second-level) liquid distribution device includes a second annular storage tank. Pool 21, second liquid distributor 22, second circulating water pump 23, second packing layer 24, second liquid collector 25, the (third) third-level liquid distribution device includes a third annular storage tank 31, a third liquid distributor 32. The third circulating water pump 33, the third packing layer 34, and the third liquid collector 35. The (third) fourth-level liquid distribution device includes a fourth annular storage tank 41, a fourth liquid distributor 42, a fourth circulating water pump 43, The fourth packing layer 44 and the fourth liquid collector 45, the (th) fifth-level liquid distribution device includes a fifth annular storage tank 51, a fifth liquid distributor 52, a fifth circulating water pump 53, a fifth packing layer 54, a fifth Liquid collector 55, the (th) sixth-level 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 is connected 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 build above the fourth level, and the energy consumption is high. In this application, the storage tank structure is changed, and the float replenishment method is eliminated. All liquid levels in the entire system can be controlled by simply detecting the liquid level of the lowest circulating storage tank.

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

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

In the multi-stage waste gas spray tower of this embodiment, a corresponding storage tank and water pump are provided 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 self-circulation of the liquid. When replenishing water, you only need to replenish water to the uppermost liquid distribution device, and then continuously overflow downwards, which can not only further improve the absorption effect, but also effectively reduce energy consumption and equipment failure rate.

Example 2

This embodiment provides a height difference overflow water replenishment method based on the multi-stage exhaust gas spray tower in Embodiment 1, which specifically includes the following steps:

1) Manufacture or modify a multi-stage exhaust gas spray tower according to the structure in Example 1.

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; the water replenishment device receives the water replenishment signal and sends it to the annular storage tank in the uppermost liquid distribution device Provide hydration. When replenishing water, you only need to add water to the uppermost 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 a water replenishment signal and the water replenishment device does not act.

5) The annular storage tank in the uppermost liquid distribution device receives the liquid delivered by the water replenishment device. The liquid level in the annular storage tank continues to rise and overflows. The overflowing liquid continuously flows from the upper liquid distribution device to the lower one. The liquid distribution device flows and is sequentially filled into the annular storage tank in the lower liquid distribution device, and finally flows to the circulating storage tank in the lowermost spray device.

The liquid level of the circulating storage tank in the lowermost spray device continues to rise. When the comparison result 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 exhaust gas spray tower of the present invention is provided with an annular storage pool in the circumferential direction of the liquid collector of each stage, eliminating the original pool at the bottom. The circulating liquid in the annular storage pool is directly transported to the corresponding spray or liquid distributor through the corresponding water pump at each stage. After spraying and liquid distribution, the circulating liquid is evenly distributed in the filler under the free flow and interacts with the rising exhaust gas. Full contact absorption. The circulating fluid is finally collected in the annular storage tank, and after overflowing, flows into the annular storage tank below, and the above process is repeated. When the liquid concentration in the lowermost primary circulation tank 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 controls the water replenishment device through the control device to open the water replenishment pneumatic ball valve. . Tap water is replenished into the annular storage tank of the highest liquid distribution device. After the highest annular storage tank is filled, the liquid overflows and automatically flows into the annular storage tank on the next layer. After it is filled, the liquid overflows and falls freely to the next layer. The liquid level of the first-circulation pool can only rise when the secondary annular storage tank is filled and falls into the first cycle. After the liquid level sensor detects that the liquid level reaches the set value, the pneumatic valve is closed to stop water replenishment.

Compared with the existing technology, the multi-stage waste gas spray tower of the present invention: (1) cancels the traditional floating ball water replenishment method, and only needs to detect the lowest cycle liquid level to control all liquid levels in the entire system; changes the traditional The storage tank structure of the original storage tank was at the bottom of the tower, which made it difficult to build the storage tank above the fourth level due to congestion; (2) placing the external circulation storage tank on top reduces the height difference between the spray and the storage tank, which can save water pumps. process, thereby reducing electricity consumption; (3) In a traditional recovery tower, N cycles require N liquid level sensors and N pneumatic valves. This application only needs to control the liquid level of one layer of circulating liquid to control the system. All liquid levels only need to be equipped with one liquid level detection and one pneumatic valve, which reduces the cost and failure rate by (N-1) times.

The above embodiments are only for illustrating the technical concepts and characteristics of the present invention. Their purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. They cannot thereby limit the scope of protection of the present invention. Equivalent changes or modifications in spirit shall be included in the protection scope of the present invention.

Claims (8)

1. The method is characterized in that the multi-stage waste gas spray tower comprises a spray device, at least n liquid distribution devices positioned above the spray device, a water supplementing device for supplementing water to the uppermost liquid distribution device, a liquid level monitoring device 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 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, wherein the second water pump is used for conveying liquid in the annular storage pool to the liquid distribution assembly;

the height difference overflow water supplementing method comprises the following steps: the liquid level monitoring device monitors the liquid level in the circulating storage pool in real time and converts the liquid level into a liquid level signal to be sent 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 comparison result shows that the received liquid level signal is smaller than the preset liquid level threshold value, the control device sends a water supplementing signal to the water supplementing device; the water supplementing device receives the water supplementing signal and supplements water to an annular storage pool in the uppermost liquid distribution device;

the annular storage pool in the uppermost liquid distribution device receives the liquid conveyed by the water supplementing device, the liquid level in the annular storage pool continuously rises and overflows, the overflowed liquid continuously flows from the upper liquid distribution device to the lower liquid distribution device, the overflowed liquid sequentially fills the annular storage pool in the lower liquid distribution device, and finally flows to the circulating storage pool in the lowermost spraying device; and the second water pump is used for conveying the liquid in the annular storage pool to the corresponding liquid distribution assembly for liquid distribution.

2. The method according to claim 1, wherein the control device does not send a water replenishment signal when the comparison result is that the received liquid level signal is greater than a preset liquid level threshold, and the water replenishment device does not operate.

3. The method of claim 1, wherein n is a natural number greater than or equal to 2.

4. The method of claim 3, wherein n is a natural number greater than or equal to 5.

5. The differential overflow moisturizing method of claim 1, wherein a packing layer and a liquid collector are disposed below the liquid distribution assembly, the liquid collector is disposed below the packing layer, and the annular reservoir is disposed between the periphery of the liquid collector and the spray tower wall.

6. The differential overflow moisturizing method of claim 5, wherein the top of the annular reservoir in the liquid distribution device is flush with or lower than the bottom of the corresponding liquid trap.

7. The method of claim 1, wherein the multi-stage flue gas spray tower comprises a demisting layer above the topmost liquid distribution device.

8. The method for compensating for height difference overflow according to any of claims 1 to 7, wherein the spray device of the multi-stage exhaust gas spray tower comprises an air inlet pipeline, the air inlet pipeline is used for introducing exhaust gas into the spray device, and one end of the air inlet pipeline is positioned under a spray assembly.