Tail gas purifying and recycling device for closed ferrosilicon heat furnace

Abstract

The invention discloses a tail gas purification and reutilization device for a closed silicon iron heat furnace, and relates to the technical field of tail gas treatment. The device comprises a tail gas treatment unit, a feeding unit and a water-gas separation unit, the tail gas treatment unit comprises a treatment tank, a condensation assembly and a spraying assembly are fixedly connected in the treatment tank, a gas adding pipe is fixedly connected outside the treatment tank, and a deslagging unit is arranged at the bottom of the treatment tank. A calcium carbonate solution is sprayed into the treatment tank through the spraying assembly, sulfur dioxide in tail gas can be absorbed, the tail gas can be cooled, meanwhile, heat exchange with water vapor can be carried out through the condensation assembly, the water vapor can be condensed and refluxed, the purity of carbon monoxide gas can be improved, and the service life of the device is prolonged. And the carbon monoxide gas can be further purified through the water-gas separation unit.

Description

Technical Field

[0001] The invention belongs to the technical field of tail gas treatment, and in particular relates to a tail gas purification and recycling device for a closed ferrosilicon ore furnace. Background Art

[0002] The closed ferrosilicon ore furnace is a high-temperature smelting equipment used to produce ferrosilicon alloy. Its main function is to convert silica and iron ore into ferrosilicon alloy through high-temperature reduction reaction. During the smelting process, tail gas will be produced. The main components of the tail gas include carbon monoxide, carbon dioxide, sulfur dioxide, etc. If these tail gases are directly discharged without treatment, they will cause harm to the environment and human health, such as causing air pollution, acid rain and respiratory diseases.

[0003] In the existing industrial silicon smelting process, the carbon monoxide gas produced needs to be treated by a boiler, a shell-and-tube cooler and a dust collector for exhaust gas purification after completing the combustion process in the furnace. However, the current treatment method fails to effectively utilize the carbon monoxide in the exhaust gas, resulting in a waste of resources.

[0004] To this end, we provide a closed ferrosilicon blast furnace tail gas purification and recycling device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a tail gas purification and recycling device for a closed ferrosilicon blast furnace, which uses a spray pipe group to evenly spray a calcium carbonate solution into a treatment tank through multiple nozzles to absorb sulfur dioxide in the tail gas and cool the tail gas. At the same time, heat exchange can be carried out with water vapor through multiple first condensers, so that the water vapor can condense and reflux, thereby improving the purity of carbon monoxide gas and solving the problem that the carbon monoxide generated by the existing industrial silicon smelting cannot be effectively utilized.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a tail gas purification and recycling device for a closed ferrosilicon ore furnace, comprising a tail gas treatment unit, a feeding unit and a water-gas separation unit; the tail gas treatment unit comprises a treatment tank, a condensation component and a spray component are fixedly connected inside the treatment tank, a gas adding pipe is fixedly connected outside the treatment tank, and a slag discharge unit is arranged at the bottom of the treatment tank;

[0008] The feeding unit comprises a mixing barrel, a relay barrel, a first liquid pump and a second liquid pump, a first liquid pipe is installed between the mixing barrel and the input end of the first liquid pump, a first liquid outlet pipe is installed between the relay barrel and the output end of the first liquid pump, a second liquid pipe is installed between the relay barrel and the input end of the second liquid pump, a second liquid outlet pipe is installed between the output end of the second liquid pump and the spray assembly, and a stirring assembly is arranged inside the mixing barrel and the relay barrel;

[0009] The water-gas separation unit includes a separation chamber, a cooler, a buffer chamber and a third liquid pump. A second condenser is fixedly connected to the inside of the separation chamber. An air inlet pipe is installed between the separation chamber and the treatment tank. A liquid suction pipe is installed between the second condenser and the buffer chamber. A liquid return pipe is installed between the buffer chamber and the output end of the cooler. A third liquid pumping pipe is installed between the input end of the third liquid pump and the second condenser. A third liquid outlet pipe is installed between the output end of the third liquid pump and the input end of the cooler.

[0010] The present invention is further configured such that the slag discharge unit includes a slag discharge barrel, and the slag discharge barrel is fixedly connected to the bottom of the processing tank, the interior of the slag discharge barrel is rotatably connected to an auger rod, a first motor is installed at the bottom of the slag discharge barrel, and the auger rod is fixedly connected to the output end of the first motor, and the outside of the slag discharge barrel is fixedly connected to a slag discharge pipe.

[0011] The present invention is further configured such that the stirring assembly includes two stirring frames, the two stirring frames are rotatably connected to the inside of a mixing barrel and a relay barrel respectively, the outsides of the two stirring frames are fixedly connected to sprockets, the external transmissions of the two sprockets are connected to chains, the top of the relay barrel is fixedly connected to a second motor, and the corresponding stirring frames are fixedly connected to the output end of the second motor.

[0012] The present invention is further configured such that the condensation component includes two water pipe groups, both of which are fixedly connected to the interior of the treatment tank, a plurality of condensing tubes are fixedly connected between the two water pipe groups, and the plurality of condensing tubes are communicated with the two water pipe groups, and the outsides of the plurality of condensing tubes are fixedly connected to a first condenser.

[0013] The present invention is further configured such that the first condenser includes a central sleeve, the central sleeve is fixedly connected to the outside of the condensing tube, a plurality of condensing fins are fixedly connected to the outside of the central sleeve, and baffles are fixedly connected to both sides of the plurality of condensing fins.

[0014] The present invention is further configured such that the spray assembly includes a spray pipe group, the spray pipe group is fixedly connected to the inside of the processing tank, and the spray pipe group is connected to the second liquid outlet pipe, and a plurality of spray heads are installed at the bottom of the spray pipe group.

[0015] The present invention is further configured such that the second condenser includes a liquid inlet pipe and a liquid discharge pipe, both of which are fixedly connected to the interior of the separation bin, and the liquid inlet pipe is connected to the liquid suction pipe, and the liquid discharge pipe is connected to the third liquid extraction pipe, and a plurality of flat copper tubes are fixedly connected between the liquid inlet pipe and the liquid discharge pipe, and the plurality of flat copper tubes are connected to the liquid inlet pipe and the liquid discharge pipe.

[0016] The present invention is further configured such that an exhaust pipe is fixedly connected to the top of the separation bin, a drain pipe is fixedly connected to the bottom of the separation bin, the drain pipe is U-shaped, water is contained inside the separation bin, and the water level is lower than the connection port between the air inlet pipe and the separation bin, and coolant is contained inside the buffer bin.

[0017] The present invention is further configured such that a feeding hopper is fixedly connected to the top of the mixing barrel, a water inlet pipe is fixedly connected to the outside of the mixing barrel, and both the feeding hopper and the water inlet pipe are communicated with the mixing barrel.

[0018] The present invention has the following beneficial effects:

[0019] 1. The present invention uses a spray pipe group to evenly spray the calcium carbonate solution inside the treatment tank through multiple nozzles, which can absorb sulfur dioxide in the tail gas and generate precipitates that fall into the bottom of the treatment tank. In addition, the sprayed calcium carbonate solution can cool the tail gas. At the same time, by supplying cold water to the water pipe group located below, the cold water is then input into the water pipe group located above along multiple condensing pipes, and then heat exchange can be performed with water vapor through multiple first condensers, so that the water vapor condenses and refluxes, which can reduce the amount of water vapor in the discharged carbon monoxide gas and improve the purity of the carbon monoxide gas.

[0020] 2. The present invention uses a third liquid pump and a cooler, and then the third liquid pump can pump the coolant in the buffer bin into the interior of the second condenser, and then discharge the mixed gas into the interior of the separation bin through the air intake pipe. After that, when the gas passes through the gap between the flat copper tubes of the second condenser, the water vapor will condense on the surface of the flat copper tube due to the low temperature, and then flow down to the bottom of the separation bin. At the same time, the carbon monoxide gas is discharged through the exhaust pipe, which can separate the water vapor in the carbon monoxide and further improve the purity of the carbon monoxide.

[0021] 3. The present invention drives the auger rod to rotate inside the slag discharge barrel through the first motor, and then the sediment accumulated in the processing tank can be automatically discharged through the auger rod.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0026] Figure 3 Schematic diagram of the structure of the condensation component.

[0027] Figure 4 It is a schematic diagram of the structure of the first condenser.

[0028] Figure 5 It is a schematic diagram of the structure of the spray assembly.

[0029] Figure 6 It is a schematic diagram of the structure of the second condenser.

[0030] Figure 7 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 100- tail gas treatment unit, 101- treatment tank, 102- condensation assembly, 102a- water pipe group, 102b- condensation pipe, 102c- first condenser, 102c-1- center sleeve, 102c-2- condensation fins, 102c-3- baffle, 103- spray assembly, 103a- spray pipe group, 103b- nozzle, 104- gas pipe, 105- water outlet pipe, 200- feeding unit, 201- mixing barrel, 202- relay barrel, 203- water inlet pipe, 204- first liquid pump, 205- first liquid pump, 206- first liquid outlet pipe, 207- second liquid pump, 208- second liquid pump, 209- second liquid outlet pipe, 21 0- hopper, 300- water-gas separation unit, 301- separation bin, 302- cooler, 303- buffer bin, 304- third liquid pump, 305- second condenser, 305a- liquid inlet pipe, 305b- liquid discharge pipe, 305c- flat copper tube, 306- third liquid pump, 307- third liquid outlet pipe, 308- air inlet pipe, 309- liquid suction pipe, 310- liquid return pipe, 311- exhaust pipe, 312- drain pipe, 400- slag discharge unit, 401- slag discharge barrel, 402- auger rod, 403- first motor, 404- slag discharge pipe, 500- stirring assembly, 501- stirring frame, 502- sprocket, 503- chain, 504- second motor. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] See also Figure 1-Figure 5 as well as Figure 7 The present invention is a tail gas purification and recycling device for a closed ferrosilicon ore furnace, comprising a tail gas treatment unit 100, a feeding unit 200 and a water-gas separation unit 300; the tail gas treatment unit 100 comprises a treatment tank 101, a condensation component 102 and a spray component 103 are fixedly connected inside the treatment tank 101, a gas supply pipe 104 is fixedly connected outside the treatment tank 101, and a slag discharge unit 400 is arranged at the bottom of the treatment tank 101. By spraying a calcium carbonate solution through the spray component 103, sulfur dioxide in the mixed gas can be absorbed on the one hand, and high-temperature gas can be quickly cooled on the other hand. A large amount of water vapor can be quickly condensed through the condensation component 102, thereby reducing the amount of water vapor in the discharged carbon monoxide gas and improving the purity of the carbon monoxide gas;

[0036] The feeding unit 200 includes a mixing barrel 201, a relay barrel 202, a first liquid pump 204 and a second liquid pump 207. A first liquid pipe 205 is installed between the mixing barrel 201 and the input end of the first liquid pump 204, a first liquid outlet pipe 206 is installed between the relay barrel 202 and the output end of the first liquid pump 204, a second liquid pipe 208 is installed between the relay barrel 202 and the input end of the second liquid pump 207, a second liquid outlet pipe 209 is installed between the output end of the second liquid pump 207 and the spray assembly 103, and a stirring assembly 500 is arranged inside the mixing barrel 201 and the relay barrel 202.

[0037] Specifically, the stirring assembly 500 includes two stirring racks 501, which are rotatably connected to the inside of the mixing barrel 201 and the relay barrel 202, respectively. The outsides of the two stirring racks 501 are fixedly connected to sprockets 502, and the outsides of the two sprockets 502 are connected to chains 503 for transmission. The top of the relay barrel 202 is fixedly connected to a second motor 504, and the corresponding stirring racks 501 are fixedly connected to the output end of the second motor 504. The two stirring racks 501 rotate in the mixing barrel 201 and the relay barrel 202, respectively, so that the calcium carbonate solution can be made more uniform and blockage caused by deposition and agglomeration can be avoided.

[0038] The condensation assembly 102 includes two water pipe groups 102a, both of which are fixedly connected to the inside of the treatment tank 101, a plurality of condensing pipes 102b are fixedly connected between the two water pipe groups 102a, and the plurality of condensing pipes 102b are connected to the two water pipe groups 102a, and the outside of the plurality of condensing pipes 102b is fixedly connected to a first condenser 102c;

[0039] The spray assembly 103 includes a spray pipe group 103a, which is fixedly connected to the inside of the processing tank 101 and communicated with the second liquid outlet pipe 209. A plurality of spray heads 103b are installed at the bottom of the spray pipe group 103a.

[0040] Furthermore, the first condenser 102c includes a central sleeve 102c-1, which is fixedly connected to the outside of the condensing pipe 102b, and a plurality of condensing fins 102c-2 are fixedly connected to the outside of the central sleeve 102c-1, and baffles 102c-3 are fixedly connected to both sides of the plurality of condensing fins 102c-2. The heat exchange area can be increased by the plurality of condensing fins 102c-2 and the baffles 102c-3, and the condensing efficiency can be improved;

[0041] A feeding hopper 210 is fixedly connected to the top of the mixing barrel 201 , a water inlet pipe 203 is fixedly connected to the outside of the mixing barrel 201 , and both the feeding hopper 210 and the water inlet pipe 203 are in communication with the mixing barrel 201 .

[0042] The operation process of this embodiment is as follows: when the tail gas of the ferrosilicon blast furnace needs to be purified, the calcium carbonate solution in the relay barrel 202 is firstly extracted through the second liquid extraction pipe 208 by starting the second liquid extraction pump 207, and then transported to the inside of the spray pipe group 103a through the second liquid outlet pipe 209, and then the calcium carbonate solution is evenly sprayed inside the treatment tank 101 through multiple nozzles 103b, and then the tail gas is filled into the treatment tank 101 through the gas filling pipe 104, and then the sulfur dioxide in the tail gas is oxidized by the calcium carbonate solution. The precipitate generated by absorption falls into the bottom of the treatment tank 101, and the sprayed calcium carbonate solution can cool the exhaust gas to generate a large amount of water vapor. At the same time, cold water is supplied to the water pipe group 102a located below, and then the cold water is input into the water pipe group 102a located above along multiple condensers 102b, and then heat exchanged with the water vapor can be performed through multiple first condensers 102c, so that the water vapor condenses and refluxes, and then a small amount of water vapor and carbon monoxide are discharged along the intake pipe 308.

[0043] Example 2

[0044] See also Figure 2 and Figure 6 On the basis of the specific embodiment 1, the water-gas separation unit 300 includes a separation chamber 301, a cooler 302, a buffer chamber 303 and a third liquid pump 304. The separation chamber 301 is fixedly connected with a second condenser 305. An air inlet pipe 308 is installed between the separation chamber 301 and the treatment tank 101. A liquid suction pipe 309 is installed between the second condenser 305 and the buffer chamber 303. A liquid return pipe 310 is installed between the buffer chamber 303 and the output end of the cooler 302. A third liquid suction pipe 306 is installed between the input end of the third liquid pump 304 and the second condenser 305. A third liquid outlet pipe 307 is installed between the output end of the third liquid pump 304 and the input end of the cooler 302. The coolant in the buffer chamber 303 can be cooled by the cooler 302. The water vapor in the gas discharged from the treatment tank 101 can be further separated by the second condenser 305, thereby further improving the purity of carbon monoxide.

[0045] Specifically, the second condenser 305 includes a liquid inlet pipe 305a and a liquid discharge pipe 305b, both of which are fixedly connected to the interior of the separation chamber 301, and the liquid inlet pipe 305a is connected to the liquid suction pipe 309, and the liquid discharge pipe 305b is connected to the third liquid extraction pipe 306, and a plurality of flat copper tubes 305c are fixedly connected between the liquid inlet pipe 305a and the liquid discharge pipe 305b, and the plurality of flat copper tubes 305c are connected to the liquid inlet pipe 305a and the liquid discharge pipe 305b, and the flat copper tubes 305c can increase the heat exchange area and improve the efficiency of water vapor condensation.

[0046] Furthermore, an exhaust pipe 311 is fixedly connected to the top of the separation chamber 301, and a drain pipe 312 is fixedly connected to the bottom of the separation chamber 301. The drain pipe 312 is U-shaped. Water is contained in the separation chamber 301, and the water level is lower than the connection port between the air inlet pipe 308 and the separation chamber 301. Coolant is contained in the buffer chamber 303. The U-shaped drain pipe 312 can prevent gas from being discharged from the drain pipe 312.

[0047] The operation process of this embodiment is as follows: when it is necessary to further separate the water vapor in the carbon monoxide, first start the third liquid pump 304 and the cooler 302, and then the third liquid pump 304 can pump the coolant in the buffer bin 303 into the second condenser 305, and then discharge the mixed gas into the separation bin 301 through the air inlet pipe 308. After that, when the gas passes through the gap between the flat copper tube 305c of the second condenser 305, the water vapor will condense on the surface of the flat copper tube 305c due to the low temperature, and then flow down to the bottom of the separation bin 301, and the carbon monoxide gas is discharged through the exhaust pipe 311. Then, the coolant that has completed the heat exchange flows into the cooler 302 through the third liquid pumping pipe 306 and the third liquid outlet pipe 307. Then, the coolant in the buffer bin 303 can be cooled by the cooler 302, and finally flows back into the buffer bin 303 through the return pipe 310.

[0048] Example 3

[0049] See also Figure 1-Figure 2 On the basis of specific embodiment 1 and specific embodiment 2, the slag discharge unit 400 includes a slag discharge barrel 401, and the slag discharge barrel 401 is fixedly connected to the bottom of the processing tank 101, the interior of the slag discharge barrel 401 is rotatably connected to an auger rod 402, a first motor 403 is installed at the bottom of the slag discharge barrel 401, and the auger rod 402 is fixedly connected to the output end of the first motor 403, and the outside of the slag discharge barrel 401 is fixedly connected to a slag discharge pipe 404, so that the sediment in the processing tank 101 can be automatically discharged by rotating the auger rod 402.

[0050] The operation process of this embodiment is as follows: when the sediment in the processing tank 101 needs to be cleaned, the auger rod 402 is first driven by the first motor 403 to rotate inside the slag discharge tube 401, and then the sediment accumulated in the processing tank 101 can be discharged through the auger rod 402.

[0051] In addition, it should be noted that the components not described in detail in this article are prior art.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A device for purifying and reusing tail gas for a closed ferrosilicon submerged arc furnace, comprising a tail gas treatment unit (100), a feeding unit (200) and a water-gas separation unit (300); characterized in that: The tail gas treatment unit (100) comprises a treatment tank (101), a condensation component (102) and a spray component (103) are fixedly connected inside the treatment tank (101), a gas supply pipe (104) is fixedly connected outside the treatment tank (101), and a slag discharge unit (400) is arranged at the bottom of the treatment tank (101); The feeding unit (200) comprises a mixing barrel (201), a relay barrel (202), a first liquid pump (204) and a second liquid pump (207); a first liquid pumping pipe (205) is installed between the mixing barrel (201) and the input end of the first liquid pump (204); a first liquid outlet pipe (206) is installed between the relay barrel (202) and the output end of the first liquid pump (204); a second liquid pumping pipe (208) is installed between the relay barrel (202) and the input end of the second liquid pump (207); a second liquid outlet pipe (209) is installed between the output end of the second liquid pump (207) and the spray assembly (103); and a stirring assembly (500) is provided inside the mixing barrel (201) and the relay barrel (202); The water-gas separation unit (300) comprises a separation chamber (301), a cooling machine (302), a buffer chamber (303) and a third liquid pump (304); a second condenser (305) is fixedly connected inside the separation chamber (301); an air inlet pipe (308) is installed between the separation chamber (301) and the treatment tank (101); a liquid suction pipe (309) is installed between the second condenser (305) and the buffer chamber (303); a liquid return pipe (310) is installed between the buffer chamber (303) and the output end of the cooling machine (302); a third liquid suction pipe (306) is installed between the input end of the third liquid pump (304) and the second condenser (305); and a third liquid outlet pipe (307) is installed between the output end of the third liquid pump (304) and the input end of the cooling machine (302).

2. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 1, characterized in that: The slag discharge unit (400) comprises a slag discharge barrel (401), and the slag discharge barrel (401) is fixedly connected to the bottom of the processing tank (101), the interior of the slag discharge barrel (401) is rotatably connected to a auger rod (402), a first motor (403) is installed at the bottom of the slag discharge barrel (401), and the auger rod (402) is fixedly connected to the output end of the first motor (403), and the exterior of the slag discharge barrel (401) is fixedly connected to a slag discharge pipe (404).

3. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 1, characterized in that: The stirring assembly (500) comprises two stirring racks (501), the two stirring racks (501) are rotatably connected to the inside of a mixing barrel (201) and a relay barrel (202), respectively; the outsides of the two stirring racks (501) are fixedly connected to sprockets (502); the outsides of the two sprockets (502) are connected to chains (503) for external transmission; the top of the relay barrel (202) is fixedly connected to a second motor (504), and the corresponding stirring racks (501) are fixedly connected to the output end of the second motor (504).

4. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 1, characterized in that: The condensation component (102) comprises two water pipe groups (102a), the two water pipe groups (102a) are fixedly connected to the inside of the treatment tank (101), a plurality of condensing pipes (102b) are fixedly connected between the two water pipe groups (102a), and the plurality of condensing pipes (102b) are connected to the two water pipe groups (102a), and the outside of the plurality of condensing pipes (102b) is fixedly connected to a first condenser (102c).

5. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 4, characterized in that: The first condenser (102c) comprises a central sleeve (102c-1), wherein the central sleeve (102c-1) is fixedly connected to the outside of the condensing tube (102b), and a plurality of condensing fins (102c-2) are fixedly connected to the outside of the central sleeve (102c-1), and baffles (102c-3) are fixedly connected to both sides of the plurality of condensing fins (102c-2).

6. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 1, characterized in that: The spray assembly (103) comprises a spray pipe group (103a), the spray pipe group (103a) is fixedly connected to the inside of the processing tank (101), and the spray pipe group (103a) is connected to the second liquid outlet pipe (209), and a plurality of spray heads (103b) are installed at the bottom of the spray pipe group (103a).

7. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 1, characterized in that: The second condenser (305) comprises a liquid inlet pipe (305a) and a liquid discharge pipe (305b), the liquid inlet pipe (305a) and the liquid discharge pipe (305b) are both fixedly connected to the interior of the separation chamber (301), the liquid inlet pipe (305a) is connected to the liquid suction pipe (309), and the liquid discharge pipe (305b) is connected to the third liquid extraction pipe (306), a plurality of flat copper tubes (305c) are fixedly connected between the liquid inlet pipe (305a) and the liquid discharge pipe (305b), and the plurality of flat copper tubes (305c) are both connected to the liquid inlet pipe (305a) and the liquid discharge pipe (305b).

8. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 1, characterized in that: The top of the separation chamber (301) is fixedly connected to an exhaust pipe (311), the bottom of the separation chamber (301) is fixedly connected to a drain pipe (312), the drain pipe (312) is U-shaped, the separation chamber (301) is filled with water, and the water level is lower than the connection port between the air inlet pipe (308) and the separation chamber (301), and the buffer chamber (303) is filled with cooling liquid.

9. The exhaust gas purification and recycling device for a closed ferrosilicon submerged arc furnace according to claim 1, characterized in that: The top of the mixing barrel (201) is fixedly connected to a feeding hopper (210), the outside of the mixing barrel (201) is fixedly connected to a water inlet pipe (203), and both the feeding hopper (210) and the water inlet pipe (203) are in communication with the mixing barrel (201).

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