Sulfur dioxide scrubbing apparatus for acid production FLUE gas

Abstract

This application relates to a sulfur dioxide scrubbing apparatus for acid production flue gas, which includes a cyclone, an intake pipe, a first reaction component, and a second reaction component. The cyclone has a spiral flow channel formed therein, as well as an intake, an exhaust, and a liquid outlet connected to the spiral flow channel. One end of the intake pipe is externally connected to acid production flue gas, and the other end is connected to the intake. The outlet of the first reaction component is connected to the intake pipe and is used to spray alkali liquid mist into the intake pipe to achieve preliminary desulfurization treatment of the acid production flue gas, which then enters the cyclone. The second reaction component sprays alkali liquid mist into the spiral flow channel for secondary desulfurization treatment of the acid production flue gas. The spiral flow channel not only extends the flow path of the flue gas to increase the reaction time and reduce the circulation spraying amount of alkali liquid per unit time but also facilitates the collection of the formed acidic liquid into a stream for discharge from the liquid outlet.

Description

[0001] Description

[0002] SULFUR DIOXIDE SCRUBBING APPARATUS FOR ACID PRODUCTION FLUE GAS

[0003] FIELD OF THE DISCLOSURE

[0004] This application relates to the field of flue gas treatment technology, particularly to a sulfur dioxide scrubbing apparatus for acid production flue gas.

[0005] BACKGROUND

[0006] In the process of sulfuric acid preparation, the flue gas generated contains harmful substances such as sulfur dioxide, sulfur trioxide, and sulfuric acid mist, which pose a serious threat to the environment. Therefore, it is necessary to treat the flue gas for desulfurization.

[0007] Currently, there are many methods for treating sulfuric acid flue gas, such as the activated carbon method, dual-alkali method, ammonia method, and hydrogen peroxide method. Among them, the ammonia method is highly regarded by many enterprises due to its high treatment efficiency.

[0008] However, in practical applications, the ammonia method for desulfurization often adopts a multi-stage spraying treatment method. Although this method has a high treatment effect, it requires a large amount of ammonia liquid for circular spraying, resulting in a large consumption of ammonia liquid.

[0009] SUMMARY

[0010] In view of this, there is a need to provide a sulfur dioxide scrubbing apparatus for acid production flue gas to address the problem of large consumption of ammonia liquid in the ammonia method for desulfurization.

[0011] This application provides a sulfur dioxide scrubbing apparatus for acid production flue gas, which includes a cyclone, an intake pipe, a first reaction component, and a second reaction component. The cyclone has a spiral flow channel formed therein and also has an intake, an exhaust, and a liquid outlet connected to the spiral flow channel. The exhaust is located at the top of the cyclone, and the liquid outlet is located at the bottom of the cyclone. One end of the intake pipe is externally connected to acid production flue gas, and the other end is connected to the intake along a direction tangent to the spiral flow channel. The outlet of the first reaction component is connected to the intake pipe and is used to spray alkali liquid mist into the intake pipe. The outlet of the second reaction component is connected to the spiral flow channel and is used to spray alkali liquid mist into the spiral flow channel.

[0012] Furthermore, the intake pipe is a Venturi tube, and the outlet of the first reaction component is connected to the negative pressure port of the Venturi tube.

[0013] Furthermore, the Venturi tube includes a feed straight pipe, a transitional conical pipe, and a discharge straight pipe connected in series, where the inner diameter of the feed straight pipe is larger than that of the discharge straight pipe. The inner diameter of the transitional conical pipe gradually expands from the middle to both ends, and the transitional conical pipe has a negative pressure port opened thereon. The feed straight pipe is connected to the flue gas, and the discharge straight pipe is connected to the intake of the cyclone along a direction tangent to the cyclone.

[0014] Furthermore, the first reaction component includes a negative pressure chamber and a plurality of first spray nozzles. The transitional conical pipe penetrates the negative pressure chamber and is connected to the negative pressure chamber through a plurality of negative pressure ports arranged circumferentially thereon. The plurality of first spray nozzles are extended into the negative pressure chamber and are evenly arranged circumferentially along the transitional conical pipe, with their spraying ends respectively directed towards the plurality of negative pressure ports.

[0015] Furthermore, the cyclone includes an outer cylinder, an inner cylinder, and a spiral plate. The inner cylinder is coaxially arranged inside the outer cylinder and extends to the top of the outer cylinder. The spiral plate is arranged inside the annular gap formed between the inner cylinder and the outer cylinder to form the spiral flow channel. The top of the inner cylinder forms the exhaust, and the bottom of the outer cylinder forms the liquid outlet.

[0016] Furthermore, the second reaction component is a second spray nozzle installed at the top of the cyclone and sprayed downward.

[0017] Furthermore, the second spray nozzle is a plurality of spray nozzles arranged in a vertical direction along the spiral flow channel .

[0018] Furthermore, the second reaction component further includes a spray disc arranged inside the inner cylinder and used for spraying mist into the inner cylinder.

[0019] Furthermore, the top of the outer cylinder is closed, the bottom of the outer cylinder is a conical structure extending upwards, and the intake of the cyclone is set on the side wall at the top of the outer cylinder.

[0020] Furthermore, the heights of the inner cylinder and the spiral plate are equal.

[0021] Compared with the existing technology, the first reaction component sprays alkali liquid mist into the intake pipe, mixes with the acid production flue gas, and achieves preliminary desulfurization treatment of the acid production flue gas. Then it enters the cyclone along a direction tangent to the cyclone and flows along the spiral flow channel. The second reaction component sprays alkali liquid mist into the spiral flow channel for secondary desulfurization treatment of the acid production flue gas. The spiral flow channel not only extends the flow path of the flue gas to increase the reaction time and reduce the circulation spraying amount of alkali liquid per unit time but also facilitates the collection of the formed acidic liquid into a stream for discharge from the liquid outlet.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a schematic diagram of the overall external structure of the sulfur dioxide scrubbing apparatus for acid production flue gas provided in an embodiment of this application. FIG. 2 is a schematic diagram of the overall internal structure of the sulfur dioxide scrubbing apparatus for acid production flue gas provided in an embodiment of this application

[0024] FIG. 3 is a structural view of the first reaction component connected to the intake pipe of the sulfur dioxide scrubbing apparatus for acid production flue gas provided in an embodiment of this application.

[0025] DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0026] The following describes the preferred embodiment of this application in detail, with the figures forming a part of this application and used together with the examples of this application to explain the principles of this application, and not to limit the scope of this application.

[0027] As shown in Figures 1-3, a sulfur dioxide scrubbing apparatus for acid production flue gas provided by this application includes a cyclone 100, an intake pipe 200, a first reaction component 300, and a second reaction component 400. The cyclone 100 has a spiral flow channel 130 formed therein and also has an intake, an exhaust 110, and a liquid outlet 120 connected to the spiral flow channel 130. The exhaust 110 is located at the top of the cyclone 100, and the liquid outlet 120 is located at the bottom of the cyclone 100. One end of the intake pipe 200 is externally connected to acid production flue gas, and the other end is connected to the intake along a direction tangent to the spiral flow channel 130. The outlet of the first reaction component 300 is connected to the intake pipe 200 and is used to spray alkali liquid mist into the intake pipe 200. The outlet of the second reaction component 400 is connected to the spiral flow channel 130 and is used to spray alkali liquid mist into the spiral flow channel 130.

[0028] During implementation, the first reaction component 300 sprays alkali liquid mist into the intake pipe 200, where it mixes with the acid production flue gas to achieve preliminary desulfurization treatment of the acid production flue gas. It then enters the cyclone 100 along a direction tangent to the cyclone and flows along the spiral flow channel 130. The second reaction component 400 sprays alkali liquid mist into the spiral flow channel 130 for secondary desulfurization treatment of the acid production flue gas. The spiral flow channel 130 not only extends the flow path of the flue gas to increase the reaction time and reduce the circulation spraying amount of alkali liquid per unit time but also facilitates the collection of the formed acidic liquid into a stream for discharge from the liquid outlet 120.

[0029] In this implementation, the cyclone 100 has a spiral flow channel 130 formed therein and also has an intake, an exhaust 110, and a liquid outlet 120 connected to the spiral flow channel 130. The exhaust 110 is located at the top of the cyclone 100, and the liquid outlet 120 is located at the bottom of the cyclone 100.

[0030] To facilitate the formation of the cyclone 100 with the above structure, in one embodiment, the cyclone 100 includes an outer cylinder 140, an inner cylinder 150, and a spiral plate 160. The inner cylinder 150 is coaxially arranged inside the outer cylinder 140 and extends to the top of the outer cylinder 140. The spiral plate 160 is arranged inside the annular gap formed between the inner cylinder 150 and the outer cylinder 140 to form the spiral flow channel 130. The top of the inner cylinder 150 forms the exhaust 110, and the bottom of the outer cylinder 140 forms the liquid outlet 120.

[0031] In this embodiment, the top of the outer cylinder 140 is closed, and the bottom of the outer cylinder 140 is a conical structure extending upwards. The intake of the cyclone 100 is set on the side wall at the top of the outer cylinder 140.

[0032] To extend the flow path of the flue gas in the spiral flow channel 130 as much as possible, in one embodiment, the heights of the inner cylinder 150 and the spiral plate 160 are equal. At the same time, the pitch of the spiral plate 160 can also be controlled .

[0033] The exhaust 110 and the liquid outlet 120 are respectively equipped with an exhaust pipe and a liquid pipe. An demister 111 is installed on the exhaust pipe, and the liquid pipe is connected to an acid liquid recovery pipe 121 below. In this implementation, one end of the intake pipe 200 is externally connected to acid production flue gas, and the other end is connected to the intake of the cyclone 100 along a direction tangent to the cyclone 100.

[0034] In one embodiment, the intake pipe 200 is a Venturi tube, and the outlet of the first reaction component 300 is connected to the negative pressure port 221 of the Venturi tube. The Venturi tube facilitates accelerated treatment of the flue gas, and the negative pressure at the negative pressure port 221 is used to absorb the alkali spray from the outlet of the first reaction component 300.

[0035] The Venturi tube in this embodiment includes a feed straight pipe 210, a transitional conical pipe 220, and a discharge straight pipe 230 connected in series. The inner diameter of the feed straight pipe 210 is larger than that of the discharge straight pipe 230. The inner diameter of the transitional conical pipe 220 gradually expands from the middle to both ends, and the transitional conical pipe 220 has a negative pressure port 221 opened thereon. The feed straight pipe 210 is connected to the flue gas, and the discharge straight pipe 230 is connected to the intake of the cyclone 100 along a direction tangent to the cyclone 100.

[0036] Specifically, the first reaction component 300 sprays a small amount of alkali liquid mist, and under the negative pressure at the negative pressure port 221, a small amount of alkali liquid mist is drawn into the intake pipe 200 to react with the flue gas .

[0037] In this implementation, the outlet of the first reaction component 300 is connected to the intake pipe 200 and is used to spray alkali liquid mist into the intake pipe 200.

[0038] In one embodiment, the first reaction component 300 includes a negative pressure chamber 310 and a plurality of first spray nozzles 320. The transitional conical pipe 220 penetrates the negative pressure chamber 310 and is connected to the negative pressure chamber 310 through a plurality of negative pressure ports 221 arranged circumferentially thereon. The plurality of first spray nozzles 320 are extended into the negative pressure chamber 310 and are evenly arranged circumferentially along the transitional conical pipe 220, with their spraying ends respectively directed towards the plurality of negative pressure ports 221.

[0039] In this implementation, the second reaction component 400, the outlet of which is connected to the spiral flow channel 130 and is used to spray alkali liquid mist into the spiral flow channel 130.

[0040] In one embodiment, the second reaction component 400 is a second spray nozzle installed at the top of the cyclone 100 and sprayed downward.

[0041] In this embodiment, the second spray nozzle is a plurality of spray nozzles arranged in a vertical direction along the spiral flow channel 130. The spraying amount of the plurality of second spray nozzles can be gradually reduced along the vertical downward direction to meet the actual needs of flue gas desulfurization treatment.

[0042] When the alkali liquid is ammonia water, since ammonia water is volatile, to avoid the escape of ammonia gas from the exhaust 110, the second reaction component 400 in this embodiment also includes a spray disc arranged inside the inner cylinder 150 and used for spraying mist into the inner cylinder 150.

[0043] Compared with the existing technology: the first reaction component 300 sprays alkali liquid mist into the intake pipe 200, mixes with the acid production flue gas, and achieves preliminary desulfurization treatment of the acid production flue gas. Then it enters the cyclone 100 along a direction tangent to the cyclone and flows along the spiral flow channel 130. The second reaction component 400 sprays alkali liquid mist into the spiral flow channel 130 for secondary desulfurization treatment of the acid production flue gas. The spiral flow channel 130 not only extends the flow path of the flue gas to increase the reaction time and reduce the circulation spraying amount of alkali liquid per unit time but also facilitates the collection of the formed acidic liquid into a stream for discharge from the liquid outlet.

[0044] The above description is only the best specific implementation of this application, but the scope of protection of this application is not limited to this. Any person skilled in the art, within the technical scope disclosed by this application, can easily think of variations or replacements, which should be covered within the scope of protection of this application .

Claims

WHAT IS CLAIMED IS1. A sulfur dioxide scrubbing apparatus for acid production flue gas, characterized by comprising:A cyclone, which has a spiral flow channel formed therein, and also has an intake, an exhaust, and a liquid outlet connected to the spiral flow channel, where the exhaust is located at the top of the cyclone, and the liquid outlet is located at the bottom of the cyclone;An intake pipe, one end of which is externally connected to acid production flue gas, and the other end of which is connected to the intake along a direction tangent to the spiral flow channel ;A first reaction component, the outlet of which is connected to the intake pipe and is used to spray alkali liquid mist into the intake pipe;A second reaction component, the outlet of which is connected to the spiral flow channel and is used to spray alkali liquid mist into the spiral flow channel.

2. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 1, characterized in that the intake pipe is a Venturi tube, and the outlet of the first reaction component is connected to the negative pressure port of the Venturi tube.

3. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 2, characterized in that the Venturi tube includes a feed straight pipe, a transitional conical pipe, and a discharge straight pipe connected in series, where the inner diameter of the feed straight pipe is larger than that of the discharge straight pipe, the inner diameter of the transitional conical pipe gradually expands from the middle to both ends, the transitional conical pipe has a negative pressure port opened thereon, the feed straight pipe is connected to the flue gas, and the discharge straight pipe is connected to the intake of the cyclone along a direction tangent to the cyclone.

4. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 3, characterized in that the first reaction component includes a negative pressure chamber and a plurality of first spray nozzles, the transitional conical pipe is arranged to penetrate the negative pressure chamber, the transitional conical pipe is connected to the negative pressure chamber through a plurality of negative pressure ports arranged circumferentially thereon, and the plurality of first spray nozzles are extended into the negative pressure chamber, and the plurality of first spray nozzles are evenly arranged circumferentially along the transitional conical pipe, with their spraying ends respectively directed towards the plurality of negative pressure ports.

5. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 1, characterized in that the cyclone includes an outer cylinder, an inner cylinder, and a spiral plate, the inner cylinder is coaxially arranged inside the outer cylinder and extends to the top of the outer cylinder, and the spiral plate is arranged inside the annular gap formed between the inner cylinder and the outer cylinder to form the spiral flow channel; wherein, the top of the inner cylinder forms the exhaust, and the bottom of the outer cylinder forms the liquid outlet .

6. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 5, characterized in that the second reaction component is a second spray nozzle installed at the top of the cyclone and sprayed downward.

7. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 6, characterized in that the second spray nozzle is a plurality of spray nozzles arranged in a vertical direction along the spiral flow channel.

8. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 6, characterized in that the second reaction component further includes a spray disc arranged insidethe inner cylinder and used for spraying mist into the inner cylinder .

9. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 5, characterized in that the top of the outer cylinder is closed, the bottom of the outer cylinder is a conical structure extending upwards, and the intake of the cyclone is set on the side wall at the top of the outer cylinder.

10. The sulfur dioxide scrubbing apparatus for acid production flue gas as claimed in claim 5, characterized in that the heights of the inner cylinder and the spiral plate are equal.

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