CN216572408U - Circulating absorption device and system for washing gas - Google Patents

Abstract

The application provides a circulating absorption device and a system for washing gas, which comprise a device body, a flow guide pipe and a pump, wherein the device body is provided with a first liquid inlet, a second liquid inlet, a first liquid outlet and an overflow port; the first liquid inlet is communicated with a second liquid outlet of the absorption tower, and the overflow port is communicated with a third liquid inlet of the washing tower; the flow guide pipe is arranged in the device body, one end of the flow guide pipe is communicated with the first liquid inlet, and the other end of the flow guide pipe freely extends downwards; the height of the free extending end of the flow guide pipe is smaller than that of the overflow port; the pump is communicated with the first liquid outlet through a first pipeline and communicated with the second liquid inlet through a second pipeline. Different from the prior art, the technical scheme increases the reaction time of the gas through repeated circulation, the incompletely reacted gas is further absorbed, the absorption rate of the prepared gas is greatly improved, the production cost is reduced, and the pollution emission is reduced.

Description

Circulating absorption device and system for washing gas

Technical Field

The application relates to the technical field of chemical industry, in particular to a circulating absorption device for washing gas.

Background

The existing absorption devices for scrubbing gas, such as a scrubbing absorption device for hydrogen fluoride, mainly comprise an absorption tower and a scrubbing tower. The crude gas enters the washing tower from the reaction converter through the gas guide pipe, and impurities of the crude gas are primarily removed. The gas from the washing tower is condensed and purified and then enters an absorption tower, and then a solution which can react with the gas is added into the absorption tower to absorb most of the gas, and finally the gas enters a tail gas treatment system. Because the time of the gas passing through the absorption tower is short, the gas can not reach the solution in the absorption tower to completely react, so that the tail gas discharged by final treatment can not meet the environmental protection requirement, exceeds the standard and causes environmental pollution.

Disclosure of Invention

In view of the above problems, it is desirable to provide a technical solution for washing and absorbing gas, so as to solve the problems of low gas absorption rate and excessive tail gas emission in the prior art.

To achieve the above object, in a first aspect, the inventors provide a cyclic absorption apparatus for scrubbing a gas, comprising:

the device body is provided with a first liquid inlet, a second liquid inlet, a first liquid outlet and an overflow port; the first liquid inlet is communicated with a second liquid outlet of the absorption tower, and the overflow port is communicated with a third liquid inlet of the washing tower;

the flow guide pipe is arranged in the device body, one end of the flow guide pipe is communicated with the first liquid inlet, and the other end of the flow guide pipe freely extends downwards; the height of the free extension end of the draft tube is smaller than that of the overflow port;

and the pump is communicated with the first liquid outlet through a first pipeline and communicated with the second liquid inlet through a second pipeline.

Be different from prior art, above-mentioned technical scheme utilizes the cooperation of first pipeline, second pipeline and pump with the leading-in first liquid outlet of liquid through the honeycomb duct, and this internal reaction of going on of this is sent back again to the liquid of outflow device body. The overflow port arranged on the device body is used for being communicated with the washing tower, and liquid which is fully reacted in the device body is sent to the washing tower to fully wash the prepared gas. After repeated circulation for many times, the reaction time of the prepared gas is increased, the incompletely reacted gas is further absorbed, the absorption rate of the prepared gas is greatly improved, the production cost is reduced, and the pollution emission is reduced.

In some embodiments, the pump is further adapted to communicate with the fourth liquid inlet of the absorption column via a third line.

In some embodiments, a first control valve is disposed on the third line.

In some embodiments, a second control valve is disposed on the second line.

In some embodiments, the free extending end of the flow guide tube is positioned directly above the first liquid outlet.

In a second aspect of the present application, the inventors provide a cyclic absorption system for scrubbing a gas, comprising:

a circulating absorption device for scrubbing gas as described in the first aspect;

the absorption tower is provided with a second liquid outlet, a first air inlet, a fourth liquid inlet and a fifth liquid inlet; the second liquid outlet is communicated with the first liquid inlet of the device; a third control valve is arranged on the liquid outlet;

a scrubber tower having a third liquid inlet, a second gas inlet, and a gas outlet; and the third liquid inlet is communicated with an overflow port of the device.

Above-mentioned technical scheme passes through the circulation absorbing device and connects absorption tower and scrubbing tower, has prolonged the reaction time of gas and liquid through the circulation absorbing device, carries out the secondary absorption to gas, has not only improved gaseous absorptivity, and the liquid that comes out from the absorption tower can reentrant the reaction once more in the circulation absorbing device, and make full use of has absorbed gaseous liquid, greatly reduced pollution emission, practiced thrift manufacturing cost.

In some embodiments, the second liquid outlet is in communication with the first liquid inlet of the device via a hose, and/or the third liquid inlet is in communication with an overflow port of the device via a hose.

In some embodiments, the gas outlet of the washing column is communicated with the first gas inlet of the absorption column sequentially through a water condenser, a first condenser and a second condenser.

In some embodiments, a spraying device is further arranged in the absorption tower, and the spraying device is communicated with the fifth liquid inlet of the absorption tower.

In some embodiments, the number of the spraying devices is multiple, and a plurality of spraying device arrays are arranged on the inner surface of the absorption tower.

The above description of the present invention is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clearly understood by those skilled in the art, further, the present invention can be implemented according to the contents described in the text and the drawings of the present application, and in order to make the above objects, other objects, features, and advantages of the present application more easily understood, the following description will be made in conjunction with the detailed description of the present application and the drawings.

Drawings

FIG. 1 is a gas scrubbing and absorption unit according to the prior art;

FIG. 2 is a block diagram of a cyclic absorption unit for scrubbing a gas according to one embodiment of the present application;

FIG. 3 is a block diagram of a cyclic absorption system for scrubbing gas in accordance with an embodiment of the present application;

FIG. 4 is a block diagram of a scrub column according to an embodiment of the present application;

FIG. 5 is a block diagram of a cyclic absorption system for scrubbing gas in accordance with an embodiment of the present application.

Description of reference numerals:

1. a circulating absorption device 11, a first liquid inlet 12, a second liquid inlet 13, a first liquid outlet 14, an overflow port 15 and a guide pipe;

2. an absorption tower 21, a second liquid outlet, 22, a fourth liquid inlet, 23, a liquid outlet, 24, a first air inlet, 25 and a fifth liquid inlet;

3. a washing tower 31, a third liquid inlet, 32, a second gas inlet, 33 and a gas outlet;

4. a pump;

5. a first pipeline;

6. a second line 61, a second control valve;

7. third pipeline, 71, first control valve.

Detailed Description

In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like of the present application, the following detailed description is given with reference to the accompanying drawings in conjunction with the listed embodiments. The embodiments described herein are merely for more clearly illustrating the technical solutions of the present application, and therefore, the embodiments are only used as examples, and the scope of the present application is not limited thereby.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution as long as there is no technical contradiction or conflict.

Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe particular embodiments and is not intended to limit the present application.

In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, meaning that three relationships may exist, for example a and/or B, meaning: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".

In this application, terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Without further limitation, in this application, the use of "including," "comprising," "having," or other similar expressions in phrases and expressions of "including," "comprising," or "having," is intended to cover a non-exclusive inclusion, and such expressions do not exclude the presence of additional elements in a process, method, or article that includes the recited elements, such that a process, method, or article that includes a list of elements may include not only those elements but also other elements not expressly listed or inherent to such process, method, or article.

As is understood in the examination of the guidelines, the terms "greater than", "less than", "more than" and the like in this application are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. In addition, in the description of the embodiments of the present application, "a plurality" means two or more (including two), and expressions related to "a plurality" similar thereto are also understood, for example, "a plurality of groups", "a plurality of times", and the like, unless specifically defined otherwise.

In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are only for convenience of describing the specific embodiments of the present application or for the convenience of the reader, and do not indicate or imply that the device or component in question must have a specific position, a specific orientation, or be constructed or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application are to be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated arrangement; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains in accordance with specific situations.

As shown in fig. 1, the conventional gas scrubbing-absorption apparatus mainly includes an absorption tower and a scrubbing tower. Taking the example of cleaning hydrofluoric acid gas, hydrogen fluoride is a highly hazardous substance and is highly corrosive. Usually, 98% concentrated sulfuric acid is fed into an absorption tower, the produced tail gas is sprayed, and most of the gas is absorbed and then fed into a washing tower. And the crude gas enters a washing tower from the reaction converter through a gas guide pipe, 98% concentrated sulfuric acid enters the washing tower and then exchanges heat with the crude gas, so that moisture, sulfuric acid and dust in the crude gas are removed. Gas from the washing tower is purified by water cooling, primary cooling, secondary cooling and other processes, enters an absorption tower, absorbs most of the gas by using 98% concentrated sulfuric acid and then enters a tail gas treatment system. The method has the following defects: firstly, the gas absorption rate is low, the environmental protection requirement cannot be met, the standard exceeding emission of fluoride is caused, and the environmental protection pollution is caused; secondly, the gas absorption rate is low, which causes the waste of gas and increases the production cost.

To solve the above problems, referring to fig. 2 and 3, a first aspect of the present application provides a recycling absorption apparatus for scrubbing gas, including an apparatus body, a flow guide pipe and a pump.

The device body is provided with a first liquid inlet 11, a second liquid inlet 12, a first liquid outlet 13 and an overflow port 14. The first liquid inlet 11 is used for communicating with the second liquid outlet 21 of the absorption tower 2, and the overflow port 14 is used for communicating with the third liquid inlet 31 of the washing tower 3. The honeycomb duct 15 is arranged in the device body, one end of the honeycomb duct is communicated with the first liquid inlet 11, and the other end of the honeycomb duct freely extends downwards. The height of the free extending end of the draft tube 15 is less than the height of the overflow outlet 14. The pump 4 communicates with a first liquid outlet 13 via a first line 5 and with a second liquid inlet 12 via a second line 6.

The device body can be used for containing liquid. After the liquid flows out from the second liquid outlet 21 of the absorption tower 2, the liquid can continue to react in the device body, so that the absorption reaction time of the liquid is prolonged. The device body is preferably made of an anti-corrosion material, so that the device body is prevented from being corroded after being soaked in liquid for a long time. In some embodiments, the first liquid outlet 13 is disposed at the bottom of the device body, and in other embodiments, the first liquid outlet 13 may be disposed at other positions. The first liquid outlet 13 is arranged at the bottom of the device body so that the liquid can flow out of the circulating absorption device 1 under the action of gravity. The positions of the first loading port 11 and the second loading port 12 may be provided on the top or on the side wall of the apparatus body. The first liquid inlet 11 and the second liquid inlet 12 are arranged at the top of the device body, so that the time of liquid flowing through the device body can be prolonged, and the absorption reaction time of the liquid is further prolonged.

The overflow port 14 is used for communicating with a third liquid inlet 31 of the washing tower 3. After the liquid level in the device body reaches the height of the overflow port 14, the liquid flows out of the overflow port 14 and enters the washing tower 3 for washing. The position of the overflow opening 14 can be set and adjusted according to actual production needs. The height of the overflow port 14 is greater than the height of the freely extending end of the draft tube 15, so that the liquid flowing out of the draft tube 15 is prevented from directly flowing out through the overflow port 14.

The honeycomb duct 15 is arranged in the device body, one end of the honeycomb duct is communicated with the first liquid inlet 11, and the other end of the honeycomb duct freely extends downwards. The flow guide 15 extends downwardly to be adjacent to the first liquid outlet 13, so that the liquid flowing through the flow guide 15 preferentially flows out of the first liquid outlet 13 and does not flow out of the overflow port 14.

The pump 4 is a machine that conveys or pressurizes a fluid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, causing the liquid energy to increase. The pumps 4 can be generally classified into a positive displacement pump 4, a power pump 4 and other types of pumps 4 according to the operation principle. In addition to classification by theory of operation, classification and naming may be by other methods. For example, the electric pump 4 and the turbine pump 4 can be classified according to the driving method; can be divided into a single-stage pump 4 and a multi-stage pump 4 according to the structure; can be divided into a boiler feed pump 4, a metering pump 4 and the like according to the application; the liquid conveying method can be divided into a water pump 4, an oil pump 4, a slurry pump 4 and the like according to the property of the conveyed liquid, wherein the water pump 4 can only convey material flow taking fluid as a medium and can not convey solids.

The first pipe 5 is a pipe directly communicating with the first liquid outlet 13, and the second pipe 6 is a pipe directly communicating with the second liquid inlet 12. The pump 4 is communicated with the first liquid outlet 13 through the first pipeline 5, and is communicated with the second liquid inlet 12 through the second pipeline 6, so that the liquid flowing out of the first liquid outlet 13 is conveyed to the second liquid inlet 12, and the liquid flowing out of the circulating absorption device 1 enters the device again.

In the specific application process, the liquid which is not completely reacted flows out of the second liquid outlet 21 of the absorption tower 2, flows into the device body from the first liquid inlet 11, and fully reacts in the device body through the flow guide pipe 15 in the device body to further absorb the prepared gas. After flowing to the free extension end of the flow guiding tube 15, the liquid flows out of the first liquid outlet 13 and enters the first pipeline 5. The liquid in the first pipeline 5 flows into the second pipeline 6 under the action of the pump 4, enters the second liquid inlet 12 and flows into the device body again. Since the liquid flowing out from the flow guide tube 15 is closer to the first liquid outlet 13 and is easier to flow out from the first liquid outlet 13, the liquid flowing into the apparatus body from the second liquid inlet 12 accumulates in the apparatus body, and the liquid continues to react. When the liquid level is higher than the height of the overflow port 14, the liquid flows out from the overflow port 14 and enters the third liquid inlet 31 of the washing tower 3, and the moisture, dust and the like in the prepared gas are washed away in the washing tower 3.

Different from the prior art, the above technical scheme leads the liquid into the first liquid outlet 13 through the draft tube 15, and the liquid flowing out of the device body is sent back to the device body again for reaction by the cooperation of the first pipeline 5, the second pipeline 6 and the pump 4. The overflow port 14 arranged on the device body is used for being communicated with the washing tower 3, and when the liquid level height of the liquid in the device body reaches the height of the overflow port 14, the liquid used for reaction and the gas to be treated are further fully reacted. The liquid fully reacted in the device body is transmitted to the washing tower 3 through the overflow port 14, so that the gas prepared by the reaction furnace is fully washed. After repeated circulation for many times, the reaction time of the prepared gas is increased, the incompletely reacted gas is further absorbed, the absorption rate of the prepared gas is greatly improved, the production cost is reduced, and the pollution emission is reduced.

In some embodiments of the present application, optionally, the pump 4 is also adapted to communicate with the fourth liquid inlet 22 of the absorption column 2 via the third line 7.

The third pipeline 7 is a pipeline directly communicated with the fourth liquid inlet 22 of the absorption tower 2. The pump 4 is communicated with the fourth liquid inlet 22 of the absorption tower 2 through the third pipeline 7, and conveys the liquid part in the first pipeline 5 to the third pipeline 7, so that the liquid enters the absorption tower 2 again for secondary absorption. The liquid enters the absorption tower 2 again to react, and the prepared gas is absorbed, so that the utilization rate of the prepared gas is improved.

In some embodiments of the present application, optionally, a first control valve 71 is provided on the third pipeline 7.

The first control valve 71 is a component having functions of diversion, interception, adjustment, throttling, backflow prevention, diversion or overflow pressure relief and the like, and can be used for controlling various types of fluid activities such as air, water, steam, various corrosive chemical media, slurry, liquid metal, radioactive substances and the like. There are various control valves such as a regulating valve, a flow dividing valve, a safety valve, a shut-off valve, a check valve, etc. The first control valve 71 may be a regulating valve for regulating the flow rate and pressure of the third pipeline 7.

The third pipeline 7 is communicated with the fourth liquid inlet 22 of the absorption tower 2, and the third pipeline 7 is provided with a first control valve 71, so that the flow and the pressure in the third pipeline 7 can be conveniently controlled, and the pressure balance state can be maintained.

In some embodiments of the present application, a second control valve 61 is optionally provided on the second pipeline 6.

The second control valve 61 is a component having functions of diversion, interception, adjustment, throttling, backflow prevention, diversion or overflow pressure relief and the like, and can be used for controlling various types of fluid activities such as air, water, steam, various corrosive chemical media, slurry, liquid metal, radioactive substances and the like. The second control valve 61 may be a regulating valve for regulating the flow rate and pressure of the second pipeline 6.

The second pipeline 6 is connected with a second liquid inlet 12 of the device body, and a second control valve 61 is arranged on the second pipeline 6, so that the flow and the pressure in the second pipeline 6 can be conveniently controlled, and the state of pressure balance can be maintained.

In some embodiments of the present application, optionally, the freely extending end of the flow guide tube 15 is located directly above the first liquid outlet 13. So set up, the liquid in the honeycomb duct 15 just directly gets into first liquid outlet 13 once flowing out honeycomb duct 15, has controlled the liquid flow direction in the device body effectively, and the liquid of avoiding flowing out in the honeycomb duct 15 gets into overflow mouth 14 and flows into scrubbing tower 3.

Referring to fig. 2, in a second aspect of the present application, there is provided a cyclic absorption system for scrubbing produced gas, comprising a cyclic absorption apparatus 1 for scrubbing produced gas, an absorption tower 2 and a scrubbing tower 3. The circulating absorption device 1 for scrubbing produced gas is the circulating absorption device 1 for scrubbing produced gas as provided in the first aspect. The absorption tower 2 has a second liquid outlet 21, a liquid outlet 23, a first gas inlet 24, a fourth liquid inlet 22 and a fifth liquid inlet 25. The second outlet 21 is in communication with the first inlet 11 of the device. A third control valve is provided on the drain port 23. The scrubber 3 has a third inlet 31, a second inlet 32 and an outlet 33, the third inlet 31 being in communication with the overflow 14 of the apparatus.

The absorption tower 2 is a mechanism for absorbing the produced gas with a liquid. The gas is sufficiently absorbed in the absorption column 2 by a liquid capable of reacting with the produced gas. The absorption tower 2 has a second liquid outlet 21, a liquid outlet 23, a first gas inlet 24, a fourth liquid inlet 22, and a fifth liquid inlet 25. The second liquid outlet 21 is used for discharging the liquid which is not completely reacted in the absorption tower 2. The second outlet 21 is in communication with the first inlet 11 of the device. The liquid discharge port 23 is used for discharging the liquid remaining in the absorption tower 2 after the circulation absorption process is completed. The liquid discharge port 23 is provided with a third control valve which is closed during the cyclic absorption process and opened after the cyclic absorption is completed. Without limitation, the second liquid outlet 21 and the liquid outlet 23 may be provided at the bottom of the absorption tower 2 to facilitate liquid discharge. And the liquid discharged from the first liquid outlet 13 of the device body passes through the first pipeline 5 and the third pipeline 7, and the fourth liquid inlet 22 of the absorption tower 2 enters the absorption tower 2 for secondary absorption.

As shown in fig. 4, the scrubber 3 has a third liquid inlet 31, a second gas inlet 32 and a gas outlet 33, and the third liquid inlet 31 communicates with the overflow port 14 of the apparatus. The washing tower 3 is connected with the reaction furnace and is used for washing the gas produced by the reaction furnace and removing impurities such as moisture, dust and the like in the gas.

During the specific use, the gas that the reacting furnace produced gets into scrubbing tower 3 from second air inlet 32 and washes, and gas after the washing gets into absorption tower 2 through gas outlet 33 of scrubbing tower, the first air inlet 24 of absorption tower in proper order, and then the liquid that is used for absorbing gas gets into absorption tower 2 from fifth inlet 25, reacts with the gas in the absorption tower, and liquid after the reaction gets into in the circulation absorbing device body via second liquid outlet 21, first inlet 11. By arranging the circulating absorption device 1, the gas and the liquid which are not completely reacted in the absorption tower 2 can be continuously reacted in the circulating absorption device body, so that the gas is more fully treated. After the liquid in the circulating absorption device body flows out from the first liquid outlet 13, a part of the liquid enters the absorption tower through the third pipeline to secondarily absorb the gas which is not completely reacted, and the other part of the liquid enters the circulating absorption device 1 again through the second pipeline to continue to react with the gas. When the liquid in the circulating absorption device is accumulated to a certain degree, the liquid level is higher than the height of the overflow port, the liquid overflows from the overflow port and enters the washing tower to wash the gas in the washing tower, and impurities in the gas in the washing tower are removed. Thus, under the action of the liquid flowing into the third liquid inlet 31, part of impurities in the gas can be washed and removed, and the gas treatment efficiency is improved. The gas generated in the reaction furnace can be effectively and fully treated by repeating the above steps for many times, so that the pollution after the gas is discharged is prevented.

Be different from prior art, above-mentioned technical scheme connects absorption tower 2 and scrubbing tower 3 through cyclic absorption device 1, utilizes cyclic absorption device to prolong the reaction time of gas and liquid, carries out the secondary absorption to gas, has not only improved gaseous absorptivity, and the liquid that comes out from the absorption tower can reentrant the reaction once more in the cyclic absorption device, and make full use of the gaseous liquid of secondary absorption, greatly reduced pollution emission, practiced thrift manufacturing cost.

In some embodiments of the present application, optionally, the second liquid outlet 21 is in communication with the first liquid inlet 11 of the apparatus via a hose, and/or the third liquid inlet 31 is in communication with the overflow port 14 of the apparatus via a hose. The hose is made of corrosion-resistant materials, so that the hose is prevented from being corroded when contacting liquid for a long time. Because liquid flows into first inlet 11 from second outlet 21 under the action of gravity, need not to set up pump 4 between second outlet 21 and the first inlet 11 and drive the liquid transportation, the pressure between second outlet 21 and the first outlet 13 is less, second outlet 21 and the first inlet 11 accessible hose connection. The liquid flows from the overflow port 14 into the third liquid inlet 31 by gravity between the third liquid inlet 31 and the overflow port 14 of the device, so that the third liquid inlet 31 can be communicated with the overflow port 14 of the device through a hose.

As shown in fig. 5, in some embodiments of the present application, the gas outlet 33 of the washing column 3 is optionally communicated with the first gas inlet 24 of the absorption column 2 sequentially through a water condenser, a first condenser and a second condenser.

The gas discharged by the washing tower 3 after primary washing passes through the water condenser, the first condenser and the second condenser in turn, and the water and SO are removed₂、SiF₄And (4) and the like. The uncondensed gas discharged from the second condenser enters the first gas inlet 24 of the absorption tower 2, and the washed gas is absorbed.

In some embodiments of the present application, optionally, a spraying device is further disposed in the absorption tower 2, and the spraying device is communicated with the fifth liquid inlet 25 of the absorption tower 2.

The spraying device inside the absorption tower 2 can be a net system consisting of spraying pipes and nozzles, and comprises a spraying layer and a recirculation pump 4 of the absorption tower 2. The absorption tower 2 recirculation pump 4 is arranged beside the absorption tower 2 and used for recirculating the spray liquid in the absorption tower 2, and the head of the pump 4 is made of corrosion-resistant materials. Each absorption tower 2 recirculating pump 4 corresponds to a spraying layer, and a hollow cone nozzle is arranged on the spraying layer and is used for atomizing spraying liquid. The spraying liquid is sent to the nozzle by the recirculating pump 4 of the absorption tower 2 through the spraying pipe group to form very fine liquid drops to be sprayed into the waste gas.

In some embodiments of the present application, optionally, the number of the spray devices is plural, and a plurality of spray device arrays are arranged on the inner surface of the absorption tower 2.

The larger the number of the spraying devices, the larger the area of the region which can be sprayed, and the more the prepared gas is sprayed and absorbed, the more the absorption is sufficient. The flow rate through each spray device is equal, so that the spray devices can uniformly distribute the spray liquid in the absorption tower 2.

In order for the reader to more intuitively understand certain embodiments of the present application, the following examples are also provided for the reader's reference.

A circulating absorption device 1 for washing gas is built between the absorption tower 2 and the washing tower 3, and secondary recovery is carried out: 98% concentrated sulfuric acid flows into the circulating absorption device 1 after coming out of the absorption tower 2, is pumped out by the pump 4, and then enters the absorption tower 2 for secondary absorption through a third pipeline 7 (provided with a first control valve 71), the circulating absorption device 1 is provided with an overflow port 14, and sulfuric acid after secondary absorption overflows and enters the washing tower 3. Wherein, the pressure of the third pipeline 7 is controlled to be (2 +/-0.1) MPa. In order to ensure pressure control, the outlet of the pump 4 is provided with a second line 6, which is directed back to the absorption unit 1, i.e. the second line 6, and a second control valve 61. The third pipeline 7 and the second pipeline 6 are both provided with pressure gauges, so that the pressure of the third pipeline 7 and the pressure of the second pipeline 6 can be monitored conveniently in real time, and further the power of the pump 4 is adjusted to adjust the flow of the third pipeline 7 and the flow of the second pipeline 6.

It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.

Claims (10)

1. A cyclical absorption apparatus for scrubbing a gas, comprising:

the device body is provided with a first liquid inlet, a second liquid inlet, a first liquid outlet and an overflow port; the first liquid inlet is communicated with a second liquid outlet of the absorption tower, and the overflow port is communicated with a third liquid inlet of the washing tower;

the flow guide pipe is arranged in the device body, one end of the flow guide pipe is communicated with the first liquid inlet, and the other end of the flow guide pipe freely extends downwards; the height of the free extension end of the draft tube is smaller than that of the overflow port;

and the pump is communicated with the first liquid outlet through a first pipeline and communicated with the second liquid inlet through a second pipeline.

2. A circulating absorption apparatus for scrubbing gas as set forth in claim 1, wherein said pump is further adapted to communicate with a fourth liquid inlet of said absorber column via a third line.

3. A recycling absorption apparatus for scrubbing gas as set forth in claim 2, wherein said third line is provided with a first control valve.

4. A recycling absorber for scrubber gas as set forth in claim 1, wherein a second control valve is provided in the second conduit.

5. The circulating absorber apparatus for scrubber gas as recited in claim 1, wherein the free extending end of the flow conduit is positioned directly above the first liquid outlet.

6. A cyclical absorption system for scrubbing a gas, comprising:

a circulating absorption apparatus for scrubbing a gas, which is the circulating absorption apparatus for scrubbing a gas according to any one of claims 1 to 5;

the absorption tower is provided with a second liquid outlet, a first air inlet, a fourth liquid inlet and a fifth liquid inlet; the second liquid outlet is communicated with the first liquid inlet of the device; a third control valve is arranged on the liquid outlet;

a scrubber tower having a third liquid inlet, a second gas inlet, and a gas outlet; the third liquid inlet is communicated with an overflow port of the device.

7. A recycling absorption system for scrubber gas as set forth in claim 6 wherein the second outlet port is in fluid communication with the first inlet port of the apparatus via a hose, and/or wherein the third inlet port is in fluid communication with the overflow port of the apparatus via a hose.

8. The recycling absorption system for scrubbing gas according to claim 6, wherein said outlet of said scrubbing tower is in communication with said first inlet of said absorption tower sequentially through a water condenser, a first condenser, and a second condenser.

9. The recycling absorption system for scrubbing gas according to claim 6, wherein said absorber further comprises a spray means, said spray means being in communication with said fifth inlet of said absorber.

10. The cyclical absorption system for scrubbing gas according to claim 9, wherein the number of the spray means is plural, and a plurality of spray means arrays are arranged on the inner surface of the absorption tower.

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