A high-absorption desulfurization method and desulfurization tower for copper smelting flue gas desulfurization using ionic liquid

Abstract

The application relates to a flue gas desulfurization technology field, in particular to a high-absorption-rate desulfurization method and a desulfurization tower for copper smelting flue gas desulfurization, S1, sulfuric acid tail gas is reversely contacted with lean liquid, and the lean liquid forms semi-rich liquid; S2, sulfur-containing flue gas enters the tower from the bottom of the desulfurization tower, is cleaned first, and is used after waste water filtration; S3, the cleaned flue gas enters an absorption section, the flue gas is reversely contacted with the lean liquid and the semi-rich liquid, and rich liquid is formed; S4, the flue gas is cleaned again through a second cleaning section; two groups of spraying sections are arranged in the desulfurization tower, the semi-rich liquid is reversely contacted with the flue gas first, so that the semi-rich liquid saturation is guaranteed to form the rich liquid, then the semi-rich liquid is reversely contacted with the lean liquid, since the flue gas has been absorbed once, the content of SO2 in the flue gas is reduced, the SO2 in the flue gas can be greatly reduced by being contacted with the lean liquid again, and the lean liquid also becomes semi-rich liquid after absorbing SO2, and the semi-rich liquid flows into the first-stage spraying section at the bottom.

Description

TECHNICAL FIELD

[0001] The application relates to a flue gas desulfurization technology field, in particular to a kind of ion liquid high absorption rate desulfurization method and desulfurization tower for copper smelting flue gas desulfurization. BACKGROUND

[0002] With the promulgation of the Copper, Nickel, Diamond Industrial Pollutant Discharge Standard (GB25467-2010), the concentration limit of boundary air pollutants of enterprises is stipulated. Domestic non-ferrous smelting enterprises begin to reform and upgrade the desulfurization technology and facilities of discharged gas. Among them, the ion liquid desulfurization technology has the characteristics of high absorption rate of sulfur dioxide in low temperature environment and high temperature environment, and the absorbed sulfur dioxide can be resolved out. It is used as the main desulfurization technology by many non-ferrous smelting enterprises.

[0003] The main factors affecting the ion liquid high absorption rate are the concentration of ion liquid in the circulating liquid and the resolution efficiency, so ensuring the stability of the resolution rate and the concentration of ion liquid in the system is the key to maintaining high absorption efficiency.

[0004] The rich liquid is resolved at high temperature, and the stability of the resolution temperature can maintain high resolution efficiency; in normal production, the main loss of ion liquid is caused by the entrainment of flue gas, and excessive loss will cause the gradual decrease of ion liquid concentration in the system. SUMMARY

[0005] The purpose of the present application is to solve the above problems, and provide a kind of ion liquid high absorption rate desulfurization method and desulfurization tower for copper smelting flue gas desulfurization.

[0006] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0007] A kind of ion liquid high absorption rate desulfurization method for copper smelting flue gas desulfurization, comprising the following steps:

[0008] S1, the sulfuric acid tail gas after washing is contacted with the lean liquid in the sulfur tail absorption tower, and the SO2 in the sulfuric acid tail gas is absorbed by the ion liquid, and the solution after absorbing SO2 is semi-rich liquid for use;

[0009] S2, the sulfur-containing flue gas enters the tower from the gas inlet at the bottom of the desulfurization tower, and the flue gas temperature is lowered by the first cleaning section to remove the dust in the flue gas, and the waste water containing dust flows into the filtering section and is used after filtering;

[0010] S3, the cleaned flue gas enters the absorption section upward, and the lean liquid is pumped into the lean liquid in the absorption section, and the semi-rich liquid is pumped into the semi-rich liquid by the reflux pump, and the flue gas is contacted with the lean liquid and the semi-rich liquid, and the lean liquid and the semi-rich liquid absorb SO2, and the solution becomes rich liquid;

[0011] S4, the water in the filtering section is sent into the second washing section by the washing circulating pump, the flue gas absorbed with SO2 is washed again, and then is discharged through the gas outlet;

[0012] S5, the rich liquid is pumped into the lean-rich liquid heat exchanger, and then is sent into the regeneration tower after heat exchange, is analyzed in the regeneration tower, the analyzed SO2 is sent into the gas-liquid separator through the regeneration gas cooler, the water in the gas is separated, high-concentration SO2 is obtained, and sulfuric acid is prepared in an acid preparation system;

[0013] S6, the regenerated ionic liquid is cooled by the ring set lean liquid cooler and the sulfur tail lean liquid cooler, and then is circulated in the respective absorption tower by the recovery backflow pump.

[0014] Further, the absorption section in S2 is divided into a first spray section and a second spray section, the first spray section uses the semi-rich liquid of the sulfur tail absorption tower, the second spray section uses the lean liquid, and the ionic liquid sprayed by the second spray section also flows into the first spray section.

[0015] Further, the regeneration tower in S5 is heated by steam, and the steam amount has two modes of flow control and pressure control, the flow control is selected when the steam pressure is high, and the pressure control is selected when the steam pressure is low.

[0016] An ionic liquid high-absorption desulfurization tower for copper smelting flue gas desulfurization is used for the above-mentioned desulfurization method, and comprises:

[0017] A desulfurization tower shell, a gas inlet is arranged at the bottom end of the desulfurization tower shell, and a gas outlet is arranged at the top end of the desulfurization tower shell;

[0018] A first washing section is arranged at the gas inlet, and is used for reducing the temperature of the flue gas and removing the smoke dust in the flue gas;

[0019] A filtering section is arranged at the bottom of the first washing section, and is used for filtering the waste water;

[0020] An absorption section is arranged at the upper part of the first washing section, and is used for absorbing SO2 in the flue gas;

[0021] A second washing section is arranged at the upper end of the absorption section, and is used for washing the flue gas absorbed with SO2 again;

[0022] A demisting device is arranged at the upper end of the second washing section, and is used for demisting the flue gas.

[0023] Further, the first cleaning section is provided with a supporting plate, the top of the supporting plate is provided with a bracket, a first wet film is arranged between the bracket and the supporting plate, the side of the bracket away from the air inlet is provided with a first air vent leading to the absorption section, a water collecting cavity is arranged in the bracket, a first downpipe is arranged in the water collecting cavity, the top of the first wet film extends into the water collecting cavity, the bottom of the bracket is provided with a cleaning nozzle near the side of the air inlet, the cleaning nozzle is connected with the water collecting cavity through a water pipe, and a rich liquid channel is arranged in the top of the bracket.

[0024] Further, the filter section is provided with a filter screen, the filter screen is provided with a cleaning assembly, the bottom of the filter section is provided with a hydraulic cylinder, the movable end of the hydraulic cylinder is provided with a movable bottom plate, and a water outlet is arranged between the movable bottom plate and the filter screen.

[0025] Further, the cleaning assembly comprises a first rotating shaft rotatably arranged at the bottom of the supporting plate, the first rotating shaft is provided with a cleaning brush, and the bottom of the cleaning brush is tightly attached to the surface of the filter screen.

[0026] Further, the absorption section comprises a first-stage spraying section and a second-stage spraying section, the top of the first-stage spraying section is provided with a first isolation frame, the side of the first isolation frame away from the first air vent is provided with a second air vent, a half-rich liquid channel is arranged in the top of the first isolation frame, and the bottom of the first isolation frame is provided with a first-stage spraying assembly;

[0027] The top of the second-stage spraying section is provided with a second isolation frame, the side of the second isolation frame away from the second air vent is provided with a third air vent, a water collecting channel is arranged in the top of the second isolation frame, the bottom of the second isolation frame is provided with a second-stage spraying assembly which has the same structure as the first-stage spraying assembly, and a lean liquid inlet is arranged in the second isolation frame and communicates with the second-stage spraying assembly.

[0028] Further, the first-stage spraying assembly comprises a second rotating shaft rotatably arranged in the second isolation frame, the bottom of the second rotating shaft is provided with a movable frame, and an ionic liquid nozzle is arranged on the movable frame.

[0029] Further, the second cleaning section is provided with a top frame, the bottom of the top frame is provided with a second wet film, the bottom end of the second wet film is located above the water collecting channel, a second downpipe is arranged in the top frame and connected with the second wet film.

[0030] Compared with the prior art, the present application has the following advantages:

[0031] The present application can ensure that the semi-rich liquid is saturated to form rich liquid by first contacting the semi-rich liquid with flue gas in countercurrent, and then contacting the semi-rich liquid with lean liquid in countercurrent, because the flue gas has been absorbed once, the content of SO2 in the flue gas is reduced, and the lean liquid will also become semi-rich liquid after absorbing SO2, which will flow into the first spray section at the bottom, thereby ensuring the absorption efficiency of the ionic liquid for SO2; at the same time, part of the ionic liquid will be carried away in the absorbed flue gas, and the second wet membrane uses filter water for cleaning flue gas, which also contains a certain amount of SO2, and the flue gas can be cleaned after passing through the second wet membrane, leaving the ionic liquid and allowing the ionic liquid to react with SO2, and the liquid absorbing SO2 will flow into the first spray section to act as semi-rich liquid, so that SO2 in the flue gas can be completely absorbed and converted, and the ionic liquid in the system can be left as much as possible for recycling. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings and their descriptions are used to explain the present application and are not intended to limit the present application. In the drawings:

[0033] Figure 1 is a schematic diagram of the overall structure of the present application;

[0034] Figure 2 is a main view of the internal structure of the present application;

[0035] Figure 3 is a schematic diagram of the connection between the first cleaning section and the filter section of the present application;

[0036] Figure 4 is a schematic diagram of the structure of the first cleaning section of the present application;

[0037] Figure 5 is a schematic diagram of the structure of the filter section of the present application;

[0038] Figure 6 is a schematic diagram of the structure of the absorption section of the present application;

[0039] Figure 7 is a schematic diagram of the structure of the second wet membrane of the present application.

[0040] In the figure: 1, desulfurization tower shell; 11, air inlet; 12, gas outlet; 2, first cleaning section; 20, support plate; 21, first wet membrane; 211, first downpipe; 22, bracket; 221, first air vent; 222, water collecting cavity; 223, rich liquid channel; 23, cleaning nozzle; 231, water pipe; 3, filter section; 31, filter screen; 32, cleaning assembly; 321, first rotating shaft; 322, cleaning brush; 33, hydraulic cylinder; 34, movable bottom plate; 35, water outlet; 4, absorption section; 41, first-stage spraying section; 42, second-stage spraying section; 43, first isolation frame; 431, second air vent; 432, half-rich liquid channel; 44, second isolation frame; 441, third air vent; 442, water collecting channel; 443, lean liquid inlet; 45, first-stage spraying assembly; 451, second rotating shaft; 452, movable frame; 453, ionic liquid nozzle; 46, second-stage spraying assembly; 5, second cleaning section; 51, top frame; 52, second wet membrane; 521, second downpipe; 6, demisting device. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0042] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0043] A high-absorption desulfurization method for copper smelting flue gas using ionic liquid, comprising the following steps:

[0044] S1, the washed sulfuric acid tail gas is in counter- contact with the lean liquid in the sulfur tail absorption tower, and the SO2 in the sulfuric acid tail gas is absorbed by the ionic liquid, and the solution after absorbing SO2 is half-rich liquid for standby;

[0045] S2, the sulfur-containing flue gas enters the tower from the air inlet 11 at the bottom of the desulfurization tower, the temperature of the flue gas is lowered by the first cleaning section 2, and the smoke dust in the flue gas is removed, the waste water containing smoke dust flows into the filter section 3, and is standby after filtration;

[0046] S3, the cleaned flue gas enters the absorption section 4 upward, and the absorption section 4 is pumped into the lean liquid by the lean liquid pump and pumped into the semi-rich liquid by the backflow pump, the flue gas is in counter- contact with the lean liquid and the semi-rich liquid, and after the lean liquid and the semi-rich liquid absorb SO2, the solution becomes rich liquid;

[0047] S4, the water in the filtering section 3 is sent to the second cleaning section 5 by the washing circulating pump to clean the flue gas absorbed with SO2 again, and after cleaning, it is discharged through the gas outlet 12;

[0048] S5, the rich liquid is pumped into the lean-rich liquid heat exchanger by the rich liquid pump, and after heat exchange, it enters the regeneration tower, is resolved in the regeneration tower, the resolved sulfur dioxide passes through the regeneration gas cooler, and then enters the gas-liquid separator, separates the water in the gas, and obtains high-concentration sulfur dioxide to enter the acid-making system to make sulfuric acid;

[0049] S6, the regenerated ionic liquid is cooled by the ring set lean liquid cooler and the sulfur tail lean liquid cooler, and then is circulated to the respective absorption tower by the recovery backflow pump.

[0050] In an embodiment, the absorption section 4 in S2 is divided into a first-stage spraying section 41 and a second-stage spraying section 42, the first-stage spraying section 41 uses the semi-rich liquid of the sulfur tail absorption tower, the second-stage spraying section 42 uses the lean liquid, and the ionic liquid sprayed by the second-stage spraying section 42 also flows into the first-stage spraying section 41.

[0051] In an embodiment, the regeneration tower in S5 is provided with heat energy by steam, and the steam amount has two ways of flow control and pressure control, the flow control is selected when the steam pressure is high, and the pressure control is selected when the steam pressure is low.

[0052] The washing circulating pump, the rich liquid pump, the lean liquid pump, the recovery pump and the backflow pump in the ionic liquid desulfurization system are variable frequency pumps, and each pump is provided with a standby pump. Each pump and each pipeline spraying flow are interlocked, the flow value can be input according to the demand, and then the corresponding pump automatically raises or lowers the frequency of the pump to reach the target flow.

[0053] The frequency of the rich liquid pump and the flow and the liquid level of the regeneration tower are cascade interlocked. The liquid level of the regeneration tower is set to 1.8 m, when the actual liquid level is higher than 1.8 m, the interlocking automatically reduces the liquid flow into the regeneration tower and the flow of the rich liquid, and then the frequency of the rich liquid pump is lowered, so that the liquid level of the regeneration tower is stably reduced to 1.8 m.

[0054] The ring set absorption tower and the backflow valve are interlocked. The liquid level of the ring set recovery tower is set to 0.85 m, when the liquid level is higher than 0.85 m, the interlocking automatically opens the backflow valve, and automatically adjusts the opening of the backflow valve according to the degree of the actual liquid level exceeding the set liquid level, so that the liquid level of the ring set absorption tower is stably reduced to 0.85 m.

[0055] The top of the ring set washing tower is equipped with high-efficiency cyclone dust removal and demisting device, and is provided with automatic flushing program, and the flushing time point is set every day, and after reaching the flushing time, seven flushing channels are opened in turn for flushing.

[0056] The gas-liquid separator pressure is interlocked with the vent valve. When the gas-liquid separator pressure is higher than 80KPa or lower than-5KPa, the interlock automatically opens the vent valve to protect the gas-liquid separator.

[0057] A control method for high absorption rate of ionic liquid for copper smelting flue gas desulfurization

[0058] 1. The water balance mode of the intelligent control system is as follows:

[0059] When the ring set absorption tower liquid level LT041504 is higher than the set value 0.85m, the reflux valve LV041504 interlocked therewith will be gradually opened to discharge part of the water in the gas-liquid separator to the outside of the system, so that the ring set absorption tower liquid level LT041504 is reduced to 0.85m.

[0060] 2. The mode for intelligently reducing the loss of ionic liquid with flue gas in the system is as follows:

[0061] 1) For the ring set recovery tank:

[0062] ①From 7 o'clock, the following operation is automatically performed every 3h: when the specified time (7:00, 10:00, 13:00, 16:00, 19:00, 22:00, 1:00, 4:00) is reached, open KV041503 for 300s, then close the valve; then open KV041502 for 120s, then close the valve.

[0063] ②And when the liquid level reaches high-high alarm, open KV041503 for 300s, then close the valve; then open KV041502 for 120s, then close the valve.

[0064] ③And when the liquid level reaches low-low alarm, open KV041502 for 120s, then close the valve.

[0065] 2) For the sulfur tail recovery tank:

[0066] ①From 9 o'clock, the following operation is automatically performed every 3h: when the specified time (9:00, 12:00, 15:00, 18:00, 21:00, 24:00, 3:00, 6:00) is reached, open KV041203 for 600s, then close the valve; then open KV041202 for 90s, then close the valve.

[0067] ②and when the liquid level reaches high report, open KV041203, open valve time 600s, then close the valve; then open KV041202, open valve time 90s, then close the valve.

[0068] ③and when the liquid level reaches low report, open KV041202, open valve time 90s, then close the valve.

[0069] 3. The intelligent control of the regenerated tower rich liquid into the tower temperature mode as follows:

[0070] When the regeneration tower rich liquid into the tower temperature temperature TE041509 is lower than 95℃, automatically increase the reboiler steam given pressure PT041518, improve the steam flow, provide more heat energy, make the rich liquid into the tower temperature temperature rises to 95℃.

[0071] Referring to Figures 1-7 Fig. 1, a copper smelting flue gas desulfurization with high absorption rate of ionic liquid desulfurization tower for the above desulfurization method, comprising:

[0072] Desulfurization tower shell 1, the bottom end of the desulfurization tower shell 1 is provided with a gas inlet 11, and the top end of the desulfurization tower shell 1 is provided with a gas outlet 12;

[0073] The first cleaning section 2 is located at the gas inlet 11, which is used to reduce the temperature of the flue gas and remove the dust in the flue gas;

[0074] The filter section 3 is located at the bottom of the first cleaning section 2, and the waste water for cleaning the flue gas flows into the filter section 3, which is used to filter the waste water, and the filtered water is used;

[0075] The absorption section 4 is located at the upper part of the first cleaning section 2, which is used to absorb SO2 in the flue gas;

[0076] The second cleaning section 5 is located at the upper end of the absorption section 4, which is used to clean the flue gas containing absorbed SO2 again, so as to avoid the loss of ionic liquid. The water used in the second cleaning section 5 is the filtered water in the filter section 3, and the rear end is connected through the first conduit;

[0077] The demisting device 6 is installed at the upper end of the second cleaning section 5, which is used to demist the flue gas.

[0078] In an embodiment, the first cleaning section 2 is provided with a supporting plate 20, the top of the supporting plate 20 is provided with a bracket 22, the bracket 22 and the supporting plate 20 are provided with a first wet film 21, the bracket 22 is provided with a first air inlet 221 leading to the absorption section 4 on the side away from the air inlet 11, the bracket 22 is provided with a water collecting cavity 222, the water collecting cavity 222 is provided with a first downpipe 211, a branch pipe can be provided at the rear end of the first downpipe 211, the branch pipe is connected with the first conduit, so that the water in the filtering section 3 can also be sent into the first downpipe 211 to form a small circulation, the top of the first wet film 21 extends into the water collecting cavity 222, the bottom of the bracket 22 is provided with a cleaning nozzle 23 near the side of the air inlet 11, the cleaning nozzle 23 is connected with the water collecting cavity 222 through a water pipe 231, the top of the bracket 22 is provided with a rich liquid passage 223, the ion liquid sprayed from the absorption section 4 forms rich liquid after absorbing SO2 in the flue gas, the rich liquid will flow out along the rich liquid passage 223 and flow into the lean-rich liquid heat exchanger.

[0079] After the flue gas enters from the air inlet 11, it is first rinsed by the cleaning nozzle 23 to complete the dust removal operation, and the flue gas is isolated from the dust after passing through the first wet film 21 to achieve the purpose of cleaning, then the flue gas can enter the absorption section 4 through the first air inlet 221.

[0080] In an embodiment, the filtering section 3 is provided with a filter screen 31, the filter screen 31 is provided with a cleaning assembly 32, the bottom of the filtering section 3 is provided with a hydraulic cylinder 33, the movable end of the hydraulic cylinder 33 is provided with a movable bottom plate 34, the movable bottom plate 34 and the filter screen 31 are provided with a water outlet 35.

[0081] After the wastewater is filtered by the filter screen 31, the solid waste is left on the filter screen 31, after a long time of use, the surface of the filter screen 31 will form a scale, at this time, the water in the filtering section 3 is first drained, the movable bottom plate 34 is pushed upward by the hydraulic cylinder 33 to contact the filter screen 31, then the water for cleaning is introduced, and the surface of the filter screen 31 is washed by the cleaning assembly 32, after the washing is completed, the wastewater is discharged.

[0082] In an embodiment, the cleaning assembly 32 includes a first rotating shaft 321 rotatably arranged at the bottom of the supporting plate 20, the first rotating shaft 321 is installed with a cleaning brush 322, the bottom of the cleaning brush 322 is tightly attached to the surface of the filter screen 31.

[0083] In an embodiment, the absorption section 4 includes a first-stage spraying section 41 and a second-stage spraying section 42, the top of the first-stage spraying section 41 is provided with a first isolation frame 43, the first isolation frame 43 is provided with a second air inlet 431 on the side away from the first air inlet 221, the top of the first isolation frame 43 is provided with a half-rich liquid passage 432, the bottom of the first isolation frame 43 is provided with a first-stage spraying assembly 45;

[0084] The flue gas first enters the first spray section 41, and the first spray assembly 45 sprays semi-rich liquid. Since the SO2 concentration in the flue gas is high at the beginning, the semi-rich liquid is quickly saturated to form rich liquid, which flows out along the rich liquid passage 223. The semi-rich liquid at this position is mainly semi-rich liquid from the sulfuric acid tail gas and liquid after cleaning by the second cleaning section 5.

[0085] The second isolation frame 44 is provided at the top of the second spray section 42, and a third air inlet 441 is formed in the side of the second isolation frame 44 away from the second air inlet 431. A water collecting passage 442 is formed at the top of the second isolation frame 44, and a second spray assembly 46 identical in structure to the first spray assembly 45 is arranged at the bottom of the second isolation frame 44. A lean liquid inlet 443 is arranged in the second isolation frame 44 and communicates with the second spray assembly 46.

[0086] After the first spray, the SO2 concentration in the flue gas is reduced, and the remaining SO2 is absorbed by the lean liquid. The absorbed solution forms semi-rich liquid, which flows into the first spray section 41 from the semi-rich liquid passage 432 at the bottom. The lean liquid used by the second spray section 42 is the regenerated ionic liquid.

[0087] In an embodiment, the first spray assembly 45 includes a second rotating shaft 451 rotatably arranged in the second isolation frame 44. The bottom of the second rotating shaft 451 is provided with a movable frame 452, and the movable frame 452 is provided with an ionic liquid nozzle 453.

[0088] In an embodiment, the second cleaning section 5 is provided with a top frame 51, and the bottom of the top frame 51 is provided with a second wet membrane 52. The bottom end of the second wet membrane 52 is located above the water collecting passage 442. The top frame 51 is provided with a second downpipe 521, and the second downpipe 521 communicates with the second wet membrane 52.

[0089] After passing through the absorption section 4, the flue gas still carries part of the ionic liquid. Since the second wet membrane 52 uses water from the filtering section 3, the water also absorbs a certain amount of SO2. When the flue gas passes through the second wet membrane 52, SO2 reacts with the ionic liquid, retaining the ionic liquid and absorbing SO2 in the filtering water. Finally, the liquid flows back into the first spray section 41 along the semi-rich liquid passage 432.

[0090] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A high-absorption-rate desulfurization tower for copper smelting flue gas desulfurization using ionic liquid, characterized in that, include: The desulfurization tower shell (1) has an air inlet (11) at the bottom and an air outlet (12) at the top. The first cleaning section (2) is located at the air inlet (11) and is used to reduce the temperature of the flue gas and remove dust from the flue gas. The filtration section (3), located at the bottom of the first cleaning section (2), is used to filter wastewater; The absorption section (4) is located above the first cleaning section (2) and is used to absorb SO2 in the flue gas. The second cleaning section (5) is located at the upper end of the absorption section (4) and is used to clean the flue gas that has absorbed SO2 again. A demisting device (6) is installed at the upper end of the second cleaning section (5) for demisting the flue gas; The water in the filter section (3) is sent to the second cleaning section (5) by the washing circulation pump to clean the flue gas that has absorbed SO2 again. After cleaning, it is discharged through the outlet (12). The first cleaning section (2) is provided with a tray (20), the top of the tray (20) is provided with a bracket (22), a first wet film (21) is provided between the bracket (22) and the tray (20), a first air vent (221) leading to the absorption section (4) is provided on the side of the bracket (22) away from the air inlet (11), a water collection chamber (222) is provided in the bracket (22), a first drain pipe (211) is provided in the water collection chamber (222), the top of the first wet film (21) extends into the water collection chamber (222), a cleaning nozzle (23) is also provided on the bottom of the bracket (22) near the air inlet (11), the cleaning nozzle (23) is connected to the water collection chamber (222) through a water pipe (231), and a liquid-rich channel (223) is provided on the top of the bracket (22). The absorption section (4) includes a primary spray section (41) and a secondary spray section (42). A first isolation frame (43) is provided at the top of the primary spray section (41). A second vent (431) is provided on the side of the first isolation frame (43) away from the first vent (221). A semi-rich liquid channel (432) is provided at the top of the first isolation frame (43). A primary spray assembly (45) is provided at the bottom of the first isolation frame (43). The top of the secondary spray section (42) is provided with a second isolation frame (44), and a third vent (441) is provided on the side of the second isolation frame (44) away from the second vent (431). A water collection channel (442) is provided on the top of the second isolation frame (44), and a secondary spray assembly (46) with the same structure as the primary spray assembly (45) is provided at the bottom of the second isolation frame (44). A lean liquid inlet (443) is provided inside the second isolation frame (44), and the lean liquid inlet (443) is connected to the secondary spray assembly (46). The second cleaning section (5) is provided with a top frame (51), and a second wet membrane (52) is provided at the bottom of the top frame (51). The bottom end of the second wet membrane (52) is located above the water collection channel (442). A second downpipe (521) is provided in the top frame (51), and the second downpipe (521) is connected to the second wet membrane (52).

2. The copper smelting flue gas desulfurization high absorption rate ionic liquid desulfurization tower according to claim 1, characterized in that, The filter section (3) is provided with a filter screen (31), a cleaning component (32) is provided on the filter screen (31), a hydraulic cylinder (33) is provided at the bottom of the filter section (3), a movable base plate (34) is provided at the movable end of the hydraulic cylinder (33), and a water outlet (35) is provided between the movable base plate (34) and the filter screen (31).

3. The copper smelting flue gas desulfurization high absorption rate ionic liquid desulfurization tower according to claim 2, characterized in that, The cleaning assembly (32) includes a first rotating shaft (321) rotatably disposed at the bottom of the tray (20), and a cleaning brush (322) is mounted on the first rotating shaft (321), with the bottom of the cleaning brush (322) in close contact with the surface of the filter screen (31).

4. The high-absorption-rate desulfurization tower for copper smelting flue gas desulfurization using ionic liquid according to claim 1, characterized in that, The primary spray assembly (45) includes a second rotating shaft (451) rotatably disposed with the second isolation frame (44), a movable frame (452) is provided at the bottom of the second rotating shaft (451), and an ion liquid nozzle (453) is provided on the movable frame (452).

5. A high-absorption-rate desulfurization method for copper smelting flue gas using ionic liquid, comprising using a high-absorption-rate desulfurization tower for copper smelting flue gas according to any one of claims 1-4, characterized in that, Includes the following steps: S1. The washed sulfuric acid tail gas is in countercurrent contact with the lean liquid in the sulfur tail gas absorption tower. SO2 in the sulfuric acid tail gas is absorbed by the ionic liquid. After SO2 absorption, the solution is a semi-rich solution for later use. S2. Sulfur-containing flue gas enters the tower through the inlet (11) at the bottom of the desulfurization tower. The flue gas temperature is reduced by the first cleaning section (2), and the dust in the flue gas is removed. The wastewater containing dust flows into the filtration section (3) and is used after filtration. S3. The cleaned flue gas enters the absorption section (4) upwards. The absorption section (4) is filled with lean liquid by a lean liquid pump and semi-rich liquid by a reflux pump. The flue gas comes into countercurrent contact with the lean liquid and semi-rich liquid. After the lean liquid and semi-rich liquid absorb SO2, the solution becomes rich liquid. S4. Water in the filter section (3) is sent to the second cleaning section (5) by the washing circulation pump to clean the flue gas that has absorbed SO2 again. After cleaning, it is discharged through the outlet (12). S5. The rich liquid is pumped into the lean and rich liquid heat exchanger for heat exchange and then enters the regeneration tower. In the regeneration tower, it is decomposed. The decomposed sulfur dioxide passes through the regeneration gas cooler and then enters the gas-liquid separator to separate the water in the gas and obtain high-concentration sulfur dioxide, which enters the acid production system to produce sulfuric acid. S6. After the regenerated ionic liquid is cooled by the ring-collecting lean liquid cooler and the sulfur tail lean liquid cooler, it is returned to its respective absorption tower for recycling via the recovery reflux pump.

6. The method for high-absorption-rate desulfurization of copper smelting flue gas using ionic liquid according to claim 5, characterized in that, The absorption section (4) in S2 is divided into a primary spray section (41) and a secondary spray section (42). The primary spray section (41) uses the semi-rich liquid from the sulfur tail absorption tower, while the secondary spray section (42) uses the lean liquid. The ionic liquid sprayed from the secondary spray section (42) will also flow into the primary spray section (41).

7. The method for high-absorption-rate desulfurization of copper smelting flue gas using ionic liquid according to claim 5, characterized in that, The regeneration tower in S5 provides heat energy through steam. The steam quantity can be controlled by either flow rate or pressure. Flow rate control is selected when the steam pressure is high, and pressure control is selected when the pressure is low.

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