CN116571352A - An anode slime flue gas purification and selenium recovery system and its application method - Google Patents

Abstract

The invention discloses an anode slime flue gas purification and selenium recovery system and a method for using the same, belonging to the technical field of anode slime flue gas purification. The DC high voltage between the electrode and the dust collecting electrode makes the dusty flue gas passing between the two electrodes ionized, and through the self-cleaning mechanism, the water body is filtered through the filter bag and returned to the water storage tank through the circulation pipe, so as to obtain a larger water body The number of internal cycles is reduced, the gear is driven to rotate through the operation of the drive frame, and the rack is applied to the rack through the rotation of the gear, and the rack is applied to the frame. The sealing plate moves forward with the movement of the transverse beam and the frame, and the vertical plate moves to On the outside of the outer frame, the operation of the double-head motor drives the two sets of adjustment frames to move in opposite directions, unlocking the corresponding vertical plates that need maintenance, and performing independent replacement and maintenance work.

Description

An anode slime flue gas purification and selenium recovery system and its application method

technical field

The invention belongs to the field of anode slime flue gas purification technology, and in particular relates to an anode slime flue gas purification and selenium recovery system and a use method thereof.

Background technique

Anode slime flue gas purification generally includes flue gas dust removal and desulfurization process. The background is that copper ore is associated with a large amount of rare and scattered metals such as gold, silver, selenium, tellurium, platinum, and palladium. During the copper smelting process, rare and scattered metals It is continuously enriched and enters anode slime through copper electrolytic refining. Copper anode slime is one of the most important raw materials for extracting rare and precious metals. The innovative development of recovery technology for rare and precious metals has significant economic value and important strategic significance.

Anode slime is generally gray-black, with a particle size of about 100-200 mesh, and its components mostly exist in the form of metals, sulfides, selenium-tellurium compounds, oxides, elemental sulfur and basic salts. The yield of copper anode slime is generally 0.2% to 0.8%, and in some cases it is as high as 1.5%. Its main components (mass fraction ω/%) are: Cu 10-25, Ag 5-53, Au 0.05-5, Se 2-24 , Ni 0.1~45, Bi 0.9~7, Pb 0.5~12, Sb 0.2~30, S 2~10, and the moisture content is about 40%.

The main characteristics and difficulties of flue gas from copper anode slime are: (1) the content of SO2 and SO3 is high, generally 0.75-3.5%; (2) the dust content of flue gas is high, generally 15-55g/Nm3, containing a large amount of valuable Soot (such as SeO2, Ag, Te, etc.) has recycling value; (3) The temperature of the flue gas is high, generally as high as 350-580°C, which requires extremely high wear resistance, temperature resistance, and corrosion resistance of the equipment system; (4) A large amount of valuable rare and scattered metals mostly exist in oxidized state, and the wet smoke formed after dissolving in water has high cohesiveness, which can easily cause system blockage. (5) The dust particle size distribution range is wide, and the size varies greatly.

Copper anode slime treatment process can be divided into fire process, combined process of separation and smelting, full wet process, hot pressure leaching method, etc., among which the current mainstream advanced process is Kaldor furnace (also known as oxygen top-blown converter, oxygen oblique blown furnace, etc.) Rotary converter) treatment process, in which wet electrostatic precipitator is often used to ionize the dusty flue gas between the two electrodes, but the load on the discharge electrode and dust collection electrode is relatively large in this operation, and the surface will be impacted by water flow for a long time. It is prone to damage and difficult to replace, so it needs to be improved.

In view of this, the present invention is proposed.

Contents of the invention

In order to solve the problems of the technologies described above, the present invention adopts the basic idea of technical solution to be:

An anode slime flue gas purification and selenium recovery system, including:

Multi-element gravity settling chamber, first-stage double-effect turbulent washing device, second-stage double-effect turbulent washing device, high-efficiency phase change cooling tower, desulfurization absorption tower, wet electrostatic precipitator, exhaust pipe, induced draft fan, plate heat exchanger , first-level slurry circulation tank, second-level slurry circulation tank, first-level acid slurry tank, second-level acid slurry tank, first-level plate and frame filter press, second-level plate and frame filter press, first-level turbulent circulation pump, Secondary turbulent circulation pump, cooling circulation pump, desulfurization absorption circulation pump, primary filter press pump, secondary filter press pump, primary acid sludge delivery pump and secondary acid sludge delivery pump;

Wet electrostatic precipitator: It is composed of a first-stage wet electrostatic precipitator and a second-stage wet electrostatic precipitator. It mainly uses DC high-voltage electricity added between the discharge electrode and the dust-collecting electrode of the electrostatic precipitator to make the dusty flue gas passing between the two electrodes Ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting pole under the action of the electric field force, and are captured by the dust collecting pole, so that the small particles of ultrafine dust in the flue gas get cleansed.

As a further solution of the present invention: the wet electrostatic precipitator includes an upper frame and a lower frame, the outer surface of the lower frame is equipped with an exhaust air duct, the bottom end of the lower frame is equipped with a base, and the rear end of the base is A water storage tank is installed, and a booster pump is installed on the upper surface of the water storage tank. The output end of the booster pump is equipped with a delivery pipe, and the output end of the delivery pipeline penetrates to the inner side of the upper frame.

As a further solution of the present invention: the inner side of the upper frame is equipped with an inner channel, the output end of the conveying pipeline is fixedly connected with the input end of the inner channel, the inner channel is set as a closed-loop structure, and the inner side of the inner channel is installed There are atomizing nozzles, and the atomizing nozzles are distributed at equal intervals.

As a further solution of the present invention: the upper frame and the lower frame are located on the same horizontal line, an outer frame is installed between the upper frame and the lower frame, the front end of the outer frame is provided with a sealing plate, and the outer frame The inner side is provided with a vertical plate, and the surface of the vertical plate is uniformly equipped with discharge electrodes and dust collection electrodes, and the discharge electrodes and dust collection electrodes are symmetrically distributed.

As a further solution of the present invention: the outer surface of the bottom end of the vertical plate is covered with a support seat, the lower surface of the support seat is equipped with an inner frame, and the inner center of the inner frame is equipped with a double-headed motor. Both the first output end and the second output end of the double-headed motor are equipped with drive shafts, and the front and rear ends of the lower surface of the support base are slidingly connected with adjustment frames, and the upper surface of the adjustment frame is equipped with a fixed frame, and the fixed frame The frame is sleeved on the outer surface of the vertical plate, the front end of the adjustment frame is penetrated with a screw hole, the outer surface of the drive shaft is provided with threads, and the drive shaft engages with the screw holes through the threads.

As a further solution of the present invention: the inner frames are distributed at equal intervals, transverse beams are installed between the inner frames, racks and sleeve frames are fixedly installed between the transverse beams, and the inner sides of the sleeve frames There is a slideway, and a driving frame is arranged under the transverse beam, and a gear is connected to the inner side of the driving frame, and the gear is meshed with the rack. Limiting frames are installed on both sides of the upper surface of the driving frame , the limit frame is inserted inside the slideway, the upper surface of the limit frame is rotatably connected with balls, the balls are distributed at equal intervals, and the balls fit the inner wall of the slideway, so The sleeve frame is fixedly connected with the sealing plate.

As a further solution of the present invention: the four corners of the lower surface of the base are equipped with legs, the base is set as a hollow structure, the bottom of the base is equipped with a circulation pipe, and the circulation pipe is fixedly connected with the water storage tank. The inner side of the base is equipped with a self-cleaning mechanism.

As a further solution of the present invention: the self-cleaning mechanism includes a pressure plate, hydraulic rods are provided at the four corners of the upper surface of the pressure plate, the hydraulic rods are fixedly connected to the inner side of the base, and the pressure plate is slidably connected to the inner side of the base, A pressure pump is installed at the center of the upper surface of the pressing plate, and the output end of the pressure pump penetrates to the lower surface of the pressing plate.

As a further solution of the present invention: the lower surface of the pressure plate is equipped with a filter bag, the bottom of the filter bag is equipped with a hollow frame, the inner side of the hollow frame is equipped with a sewage controller, and one side of the lower surface of the base is A sewage discharge channel is installed, and the output end of the sewage discharge controller is connected with the sewage discharge channel.

A method for using an anode slime flue gas purification and selenium recovery system, comprising the following steps:

S1: During the operation of the wet electrostatic precipitator, the flue gas enters the outer frame and the inner side of the sealing plate through the upper frame, and contacts the vertical plate. For the output current of the discharge electrode and the dust collection electrode, the DC between the discharge electrode and the dust collection electrode The high-voltage electricity makes the dusty flue gas passing between the two electrodes ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting pole under the action of the electric field force, and are captured by the dust collecting pole , so that the small particles and ultra-fine dust in the flue gas are purified, the gas enters the lower frame, and is discharged through the exhaust air channel, the booster pump is started, and the water inside the water storage tank is sent to the inner channel through the delivery pipe, and then delivered to the atomizer The nozzle performs atomization treatment to form a water film on the surface of the vertical plate;

S2: The water film flows down along the gravity, start the pressure pump, introduce the water flow into the filter bag, and through the expansion and contraction of the hydraulic rod, drive the pressure plate to move down, pressurize the hollow frame and the filter bag, so that the water body passes through the filter bag and passes through the circulation The pipe returns to the water storage tank to obtain a maximum number of internal circulation of the water body, and the dust particles are discharged through the sewage controller and the sewage channel;

S3: When it is necessary to maintain the discharge electrode and the dust collection electrode, the gear is driven to rotate through the operation of the drive frame, and the rack is applied to the rack through the rotation of the gear, and the rack is applied to the sleeve frame. At this time, the limit frame and the The structural combination of the slideway limits the moving track of the casing frame and the horizontal beam, and through the rotation of the ball, the horizontal beam moves more smoothly. At this time, the sealing plate moves forward with the movement of the horizontal beam and the casing frame, and the vertical plate moves to outside of the outer frame;

S4: Preliminarily limit the placement position of the vertical plate through the support seat, and cooperate with the fixing frame to achieve the fixing function for the vertical plate, start the double-head motor, drive the drive shaft to rotate through the operation of the double-head motor, and pass the thread and the screw hole The structural combination drives the two sets of adjustment frames to move in opposite directions, and then adjusts the position of the fixed frame, unlocks the corresponding vertical plate that needs maintenance, and performs related operations for replacement or maintenance.

Beneficial effect:

By outputting current to the discharge electrode and the dust collection electrode, the DC high voltage between the discharge electrode and the dust collection electrode ionizes the dusty gas passing through the two electrodes, and through the self-cleaning mechanism, the water body is filtered through the filter bag and passed through The circulation pipe returns to the water storage tank to maximize the number of internal circulation of the water body. The gear is driven to rotate through the operation of the drive frame, and the gear is rotated to apply force to the rack. The rack applies force to the sleeve frame, and the sealing plate follows the horizontal direction The movement of the beam and the casing moves forward, the vertical plate moves to the outside of the outer frame, and the operation of the double-headed motor drives the two sets of adjustment frames to move in the opposite direction, unlocking the corresponding vertical plate that needs maintenance, and independent replacement and maintenance work .

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, obtaining other drawings based on these drawings still belongs to the scope of the present invention without any creative effort.

In the attached picture:

Fig. 1 is a process flow diagram of the present invention;

Fig. 2 is the schematic diagram of the three-dimensional structure of the wet electrostatic precipitator of the present invention;

Fig. 3 is a schematic diagram of the position explosion of the water storage tank of the present invention;

Fig. 4 is a schematic exploded view of the partial structure of the outer frame of the present invention;

Fig. 5 is a schematic diagram of the partial structure of the position of the vertical board of the present invention;

Fig. 6 is the enlarged schematic view of A place of Fig. 5 of the present invention;

Fig. 7 is a schematic exploded view of the internal structure of the outer frame of the present invention;

Figure 8 is a schematic diagram of the explosion of the self-cleaning mechanism of the present invention;

Fig. 9 is a schematic side view of Fig. 7 of the present invention;

Fig. 10 is a sectional view one of a multi-element gravity settling chamber in the present invention;

Fig. 11 is the sectional drawing two of multi-element gravity settling chamber among the present invention;

Fig. 12 is a schematic diagram 1 of the self-cleaning filter mechanism in the present invention;

Fig. 13 is the second schematic diagram of the self-cleaning filter mechanism in the present invention.

In the picture:

101. Multi-element gravity settling chamber; 102. First-level double-effect turbulent washing device; 103. Second-level double-effect turbulent washing device; 104. High-efficiency phase change cooling tower; 105. First-level wet electrostatic precipitator; 106. Desulfurization Absorption tower; 107, secondary wet electrostatic precipitator; 108, exhaust pipe; 109, induced draft fan; 110, plate heat exchanger; 111, primary slurry circulation tank; 112, secondary slurry circulation tank; 113, primary Acid slurry tank; 114, secondary acid slurry tank; 115, primary plate and frame filter press; 116, secondary plate and frame filter press; 117, primary turbulent circulation pump; 118, secondary turbulent circulation Pump; 119. Cooling circulation pump; 120. Desulfurization absorption circulation pump; 121. Primary filter press pump; 122. Secondary filter press pump; 123. Primary acid mud delivery pump; 124. Secondary acid sludge delivery pump; 1 1. Upper frame; 2. Lower frame; 3. Exhaust air duct; 4. Base; 5. Water storage tank; 6. Booster pump; ; 11, sealing plate; 12, vertical plate; 13, discharge electrode; 14, dust collection pole; 15, support seat; 16, inner frame; 17, double-head motor; 18, drive shaft; Fixed frame; 21, transverse beam; 22, sleeve frame; 23, rack; 24, drive frame; 25, limit frame; 26, gear; 27, circulation pipe; 28, pressure plate; 29, hydraulic rod; 30, pressure Pump; 31, hollow frame; 32, filter bag; 33, sewage controller; 34, sewage channel.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

The terms of direction and position mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom" ", "side", etc., are only referring to the direction or position of the drawings. Therefore, the terms used in direction and position are used to explain and understand the present invention, but not to limit the protection scope of the present invention.

As shown in Figures 1 to 3, an anode slime flue gas purification and selenium recovery system includes:

Multi-element gravity settling chamber 101, first-level double-effect turbulent washing device 102, second-level double-effect turbulent washing device 103, high-efficiency phase change cooling tower 104, desulfurization absorption tower 106, wet electrostatic precipitator, exhaust pipe 108, induction Fan 109, plate heat exchanger 110, primary slurry circulation tank 111, secondary slurry circulation tank 112, primary acid slurry tank 113, secondary acid slurry tank 114, primary plate and frame filter press 115, secondary Plate and frame filter press 116, first-stage turbulent circulation pump 117, second-stage turbulent circulation pump 118, cooling circulation pump 119, desulfurization absorption circulation pump 120, first-stage filter press pump 121, second-stage filter press pump 122, first-stage Acid mud delivery pump 123 and secondary acid mud delivery pump 124;

Wet electrostatic precipitator: It is composed of a first-stage wet electrostatic precipitator 105 and a second-stage wet electrostatic precipitator 107. The dusty flue gas is ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting pole 14 under the action of the electric field force, and are captured by the dust collecting pole 14, so that The small particles of ultrafine dust are purified.

In this system, through the multi-effect cascade process route configuration, the selenium recovery rate has been increased from the traditional 75%-80% to 87%-92%, and the pollution factors such as SO2, dust, and acid mist have achieved ultra-low and ultra-clean emissions. The economic and environmental benefits are significantly improved. Through the output current to the discharge electrode 13 and the dust collection electrode 14, the DC high voltage between the discharge electrode 13 and the dust collection electrode 14 makes the dust-laden smoke passing between the two electrodes ionized, and through self-cleaning mechanism, so that the water body is filtered through the filter bag 32, and returned to the water storage tank 5 through the circulation pipe 27, so as to obtain a greater number of internal circulation of the water body, and the operation of the drive frame 24 drives the gear 26 to rotate, and the rotation of the gear 26 The rack 23 exerts force, and the rack 23 exerts force on the sleeve frame 22. The sealing plate 11 moves forward with the movement of the transverse beam 21 and the sleeve frame 22, and the vertical plate 12 moves to the outside of the outer frame 10, driven by the operation of the double-head motor 17. The two groups of adjustment frames 19 move in opposite directions to unlock the corresponding vertical plates 12 that need maintenance, and perform independent replacement and maintenance work.

As shown in Figure 1, the connection structure and working principle of each device in this system are as follows:

Specifically, the multi-element gravity settling chamber 101 includes a main frame body 1.1, and a plurality of connected compartments 1.2 are arranged in the main frame body 1.1, and air flow baffles 1.3 are arranged between adjacent compartments 1.2, and each Hoppers 1.4 are installed at the bottom of the cabins 1.2, and the multi-element gravity settling chambers 101 are respectively connected with the Kaldor furnace and the first-stage double-effect turbulent washing device 102 .

Specifically, the bottom of the first-level double-effect turbulent washing device 102 is connected with the first-level slurry circulation tank 111, and the first-level slurry circulation tank 111 is respectively connected with the first-level turbulent circulation pump 117 and the first-level filter press pump 121. The circulation pump 117 is connected to the first-stage double-effect turbulent washing device 102, the first-stage filter press pump 121 is connected to the second-stage plate-and-frame filter press 116, and the second-stage plate-and-frame filter press 116 is connected to the second-stage acid mud tank 114 and the second-stage filter press 114 respectively. The crude selenium reduction tank is connected, the secondary acid mud tank 114 is connected with the primary acid mud delivery pump 123, and the primary acid sludge delivery pump 123 is connected to the drying process before the furnace; The first-stage double-effect turbulent washing device 103 is connected, and the bottom of the second-stage double-effect turbulent washing device 103 is connected with the second-level slurry circulation tank 112, and the second-level slurry circulation tank 112 is connected with the second-level turbulent circulation pump 118 and the second-level filter press pump respectively. 122, the secondary turbulent circulation pump 118 is connected to the secondary double-effect turbulent washing device 103, the secondary filter press pump 122 is connected to the primary plate and frame filter press 115, and the primary plate and frame filter press 115 is connected to the primary plate and frame filter press 115 respectively. The primary acid mud delivery pump 123 is connected to the coarse selenium reduction tank, the primary acid mud delivery pump 123 is connected to the secondary acid mud delivery pump 124, and the secondary acid mud delivery pump 124 is connected to the pre-furnace drying process. Wherein, the first-level double-effect turbulent washing device 102 and the second-level double-effect turbulent washing device 103 both include a gas-liquid separation tower with a cavity, and nozzles are arranged in the gas-liquid separation tower, and the first-level slurry circulation tank 111 and the second-level slurry circulation tank 111 are connected to each other. The tops of the first-stage slurry circulation tanks 112 are provided with stirring assemblies.

Specifically, the two-stage double-effect turbulent washing device 103 is connected to the high-efficiency phase-change cooling tower 104, the high-efficiency phase-change cooling tower 104 is connected to the cooling circulation pump 119, and the plate heat exchanger 110 is connected to the cooling circulation pump 119 and the high-efficiency phase-change cooling tower respectively. Tower 104, one end of the circulating water inlet and one end of the circulating water return, and a packing layer is arranged in the high-efficiency phase change cooling tower 104 .

Specifically, the high-efficiency phase change cooling tower 104 is connected to the first-stage wet electrostatic precipitator 105, the first-stage wet electrostatic precipitator 105 is connected to the induced draft fan 109, the induced draft fan 109 is connected to the desulfurization absorption tower 106, and the top of the desulfurization absorption tower 106 is connected to the second-stage The wet electrostatic precipitator 107 is connected, the secondary wet electrostatic precipitator 107 is connected with the exhaust cylinder 108, the desulfurization absorption tower 106 is connected with the desulfurization absorption circulation pump 120 and the waste water treatment device.

working principle:

A1: The high-temperature, high-dust, and high-selenium flue gas from the Kaldor furnace enters the multi-element gravity settling chamber 101, where some super-large particles, high-density soot and anode slime particles fall into the elemental gravity settling chamber through gravity and gas velocity slow down. 101 The bottom of the hopper is separated; the gravity settling chamber is equipped with multiple cabins and airflow baffles, which can achieve the purpose of collecting smoke and dust by delaying the airflow velocity and increasing the gas flow path.

Among them, the multi-element gravity settling chamber 101 removes super large particles, large specific gravity smoke dust and anode slime particles in the flue gas before the wet purification system, so as to avoid the wear and blockage of pipes, valves and pumps caused by being brought into the circulating slurry , to achieve long-term stable operation of the flue gas purification system.

A2: The flue gas from the multi-element gravity settling chamber 101 enters the first-stage double-effect turbulent scrubbing device 102, adopts the wet turbulent scrubbing technology, and first cools the high-temperature flue gas rapidly to reduce the temperature of the flue gas to the saturation temperature. The temperature is 60°C-65°C to avoid damage to subsequent equipment by high-temperature flue gas; then the flue gas passes through the multi-effect foam zone and is in countercurrent collision contact with the aqueous solution sprayed by the first-stage double-effect turbulent washing device 102 high-efficiency washing nozzle, and the flue gas contains about 80% of the particulate smoke, most of SeO ₂ , As ₂ O ₃ , and TeO ₂ are absorbed by the aqueous solution into the circulating fluid. The main chemical reaction equation is as follows: SeO ₂ +H ₂ O=H ₂ SeO ₃ , As ₂ O ₃ +H ₂ O=2HAsO ₂ ; the flue gas enters the gas-liquid separation tower after being washed in the double-effect foam zone, and is separated in the gas-liquid separation The liquid droplet entrainment and free water vapor in the flue gas are preliminarily separated in the tower and then enter the second-stage double-effect turbulent washing device 103 .

Among them, the double-effect turbulent washing device adopts a large-caliber polytetrafluoroethylene non-atomizing nozzle, so that the washing circulating liquid passing through the nozzle is sprayed into the cavity at a high speed against the airflow, forming a foam area where the gas-liquid-solid three-phase strong turbulent flow is relatively strong. The high specific surface area provides an efficient momentum, mass, and heat exchange field for the surface contact of gas-liquid-solid, completes the collection of smoke and dust entrained in the gas phase, gaseous valuable metals and the cooling process of the flue gas, greatly improving the purification of the flue gas Efficiency and selenium recovery rate, and the main washing area adopts the design of large cavity and high specific area foam area, which can be used in a wide range of flue gas volume and dust concentration, with strong adjustability, and the flue gas adjustment range can reach 50-120%.

At the same time, the separate form of the tower tank is adopted, and the stirring equipment on the top of the tower is equipped, which better adapts to the high salt and high solid content environment formed by the flue gas washing of copper anode slime, and completely solves the problem of fixed deposition blockage in the liquid phase circulation system.

A3: The flue gas from the gas-liquid separation tower of the first-stage double-effect turbulent washing device 102 enters the second-stage double-effect turbulent washing device 103. After washing by washing device 102, the dust, SeO2, As2O3, TeO2, etc. in the flue gas are greatly reduced, and the lower concentration of selenium-containing flue gas is absorbed by NaOH lye, so it is necessary to inject 30% in the secondary slurry circulation tank 112 NaOH lye, maintain the pH of the slurry in the range of 7.5-8.0, and at the same time, SO2 in the flue gas is also greatly removed here. The main chemical reaction equation is as follows: SeO ₂ +2NaOH=Na ₂ SeO ₃ +H ₂ O, As ₂ O ₃ +2NaOH=2NaAsO ₂ +H ₂ O, SO ₂ +2NaOH=Na ₂ SO ₃ +H ₂ O.

In A2 and A3, the circulating liquid enters the corresponding slurry circulation tank through the bottom flow pipeline of the gas-liquid separation tower, and a part of the circulating slurry is transported to the corresponding double-effect turbulent washing device through the corresponding turbulent circulation pump for continuous cycle washing, and the other part The circulating slurry is transported to the corresponding plate and frame filter press through the corresponding filter press pump to separate the soot in the selenium-containing circulating liquid for solid-liquid separation. When the concentration of the selenium-enriched circulating liquid reaches 30-100g/L, the clear liquid of the plate and frame filter press is switched back to the coarse selenium reduction tank for selenium reduction; the acid in the plate and frame filter press The mud is further pulped through the corresponding acid mud slurry tank.

A4: The flue gas from the two-stage double-effect turbulent washing device 103 enters the bottom of the high-efficiency phase-change cooling tower 104, and after being distributed by the gas distribution device, it flows countercurrently with the alkaline cooling medium and continuously passes through the gaps in the packing layer. On the surface of the packing, The gas-liquid two-phase is in close contact for mass transfer and heat transfer, and the flue gas temperature is reduced to 38-42°C. It is found through experiments that the trace selenium in the flue gas is easily absorbed by the lye at 40°C, and reducing the flue gas temperature can avoid SeO ₂ is volatilized and lost, further improving the recovery rate of selenium; the alkaline cooling medium absorbs heat and absorbs selenium in the high-efficiency phase-change cooling tower 104, and then sends it to the plate heat exchanger 110 through the cooling circulation pump 119 at the bottom of the tower for heat exchange and then continues to pump The packing layer in the tower circulates and absorbs.

Among them, the high-efficiency phase-change condensing tower 104 further reduces the temperature of the saturated flue gas, which not only avoids the volatilization and loss of SeO ₂ in the flue gas, but also greatly improves the recovery rate of selenium, and at the same time makes the soluble pollutants such as heavy metal salt ions in the flue gas The removal of liquid improves the emission effect of purifying flue gas.

A5: The low-temperature flue gas from the top of the high-efficiency phase-change cooling tower 104 enters the first-stage wet electrostatic precipitator 105. The dust and flue gas is ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting pole under the action of the electric field force, and are captured by the dust collecting pole, so that the small particles in the flue gas The ultra-fine dust is purified, and the dust collected by the dust collector is washed by regular water spraying and settled into the lower storage tank.

After pre-order multi-effect cascade absorption, about 99.9% of SeO ₂ , 99.5% of dust, and 99% of SO ₂ in the flue gas have been recovered or removed. In order to meet the requirements of ultra-low and ultra-clean emission of flue gas, further flue gas SO ₂ , dust and other pollution in the air are removed.

A6: The flue gas from the first-stage wet electrostatic precipitator 105 is pressurized by the induced draft fan 109 and sent to the bottom of the desulfurization absorption tower 106. At this time, the main pollutants in the flue gas are SO ₂ and dust. One-layer solid atomizing nozzle, after the pollutants in the flue gas contact with the washing liquid, the droplets or liquid film diffuse and attach to the airflow particles, or humidify the particles, so that the particles can be separated and removed by gravity and inertia. The gaseous pollutants are absorbed by the alkaline absorption liquid through turbulence, molecular diffusion and other mass transfer processes and chemical reactions to achieve the purpose of separation from the flue gas; a herringbone demister is installed on the top of the tower to further remove the entrainment of droplets in the flue gas and free droplets.

Among them, the wet electrostatic dust removal technology is used in front of the induced draft fan 109, and the dust is charged by a high-voltage electric field, which effectively removes submicron particles and ultrafine dust in the flue gas, and solves the problem of the high-speed rotation of the impeller caused by the smoke and dust brought into the induced draft fan 109. Bonded dust causes dynamic balance failure and flutter phenomenon, realizing long-term stable operation.

A7: The purified flue gas from the desulfurization absorption tower 106 enters the secondary wet electrostatic precipitator 107. The working principle is the same as that of the wet electrostatic precipitator 105, which further removes ultrafine dust and submicron particles in the flue gas, so that the flue gas is discharged outside Dust content <10mg/Nm ³ , SO ₂ <30mg/Nm ³ , truly realizing ultra-low and ultra-clean emission of flue gas.

In this system, the circulating liquid adopts the method of serial liquid from thin to thick, from back to front, and reverse to the flue gas, and is sent to the upper level by the side line of the circulation pipeline at the outlet of each group of circulating pumps, that is, the 106 liquid collection tank of the desulfurization absorption tower → high efficiency Phase-change cooling tower 104 liquid collection tank → secondary slurry circulation tank 112 → primary slurry circulation tank 111 in order to ensure that the concentration of selenium in the system circulating fluid is gradually enriched from the back to the front, and finally discharged to the thickness at a high concentration Restore the system.

The system has low resistance and low energy consumption. The traditional Venturi technology has a resistance drop as high as 33-35KPa, and this technology is only 10KPa, which is about 70% lower. At the same time, it adopts the design concept of multi-effect cascade absorption, which is removed step by step according to the particle size. The caliber polytetrafluoroethylene non-atomizing nozzle can well avoid the problem of wear and tear of equipment and pipelines; and the solution of circulating absorption liquid against the flow of liquid not only maximizes the concentration of selenium-enriched solution required for the reduction of crude selenium, The reduction rate is accelerated, and the problem of volatilization and loss of selenium is also solved.

Further, as shown in Figure 2 and Figure 3, the wet electrostatic precipitator includes an upper frame 1 and a lower frame 2, the outer surface of the lower frame 2 is equipped with an exhaust air duct 3, and the bottom end of the lower frame 2 is equipped with a base 4, the base The rear end of 4 is equipped with a water storage tank 5, and the upper surface of the water storage tank 5 is equipped with a booster pump 6, and the output end of the booster pump 6 is equipped with a delivery pipeline 7, and the output end of the delivery pipeline 7 runs through to the inner side of the upper frame 1, and the upper The inner side of the frame 1 is equipped with an inner channel 8, the output end of the delivery pipe 7 is fixedly connected with the input end of the inner channel 8, the inner channel 8 is set as a closed-loop structure, and the inner side of the inner channel 8 is equipped with an atomizing nozzle 9, and the atomizing nozzle 9 equally spaced between them.

The flue gas enters the inner side of the outer frame 10 and the sealing plate 11 through the upper frame 1, starts the booster pump 6, and sends the water body inside the water storage tank 5 to the inner channel 8 through the delivery pipe 7, and delivers it to the atomizing nozzle 9 for atomization treatment. A water film is formed on the surface of the vertical board 12 , and the water film flows down along the gravity to achieve a cleaning function on the surface of the vertical board 12 .

Specifically, as shown in Figure 4 and Figure 5, the upper frame 1 and the lower frame 2 are located on the same horizontal line, the outer frame 10 is installed between the upper frame 1 and the lower frame 2, and the front end of the outer frame 10 is provided with a sealing plate 11 , The inner side of the outer frame 10 is provided with a vertical plate 12, and the surface of the vertical plate 12 is evenly equipped with a discharge electrode 13 and a dust collection electrode 14, which are symmetrically distributed between the discharge electrode 13 and the dust collection electrode 14.

The flue gas enters the inner side of the outer frame 10 and the sealing plate 11 through the upper frame 1, contacts with the vertical plate 12, and outputs current to the discharge electrode 13 and the dust collection electrode 14, and the DC high voltage between the discharge electrode 13 and the dust collection electrode 14 makes The dust-containing flue gas between the two electrodes is ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting pole 14 under the action of the electric field force, and are captured by the dust collecting pole 14, thereby Purify the small particles and ultrafine dust in the flue gas.

Specifically, as shown in Figure 6, the outer surface of the bottom end of the vertical plate 12 is covered with a support base 15, the lower surface of the support base 15 is equipped with an inner frame 16, and the inner center of the inner frame 16 is equipped with a double-head motor 17, The first output end and the second output end of the double-headed motor 17 are equipped with a drive shaft 18, and the front and rear ends of the lower surface of the support base 15 are slidingly connected with an adjustment frame 19, and the upper surface of the adjustment frame 19 is equipped with a fixed frame 20, which is fixed The frame 20 is sleeved on the outer surface of the vertical plate 12, the front end of the adjusting frame 19 runs through a screw hole, the outer surface of the drive shaft 18 is provided with threads, and the drive shaft 18 engages with the screw holes through the threads.

The placement position of the vertical plate 12 is initially limited by the support base 15, and the fixed frame 20 is used to achieve the fixing function for the vertical plate 12. The double-head motor 17 is started, and the operation of the double-head motor 17 drives the drive shaft 18 to rotate, and Through the combination of threads and screw holes, the two sets of adjustment frames 19 are driven to move in opposite directions, and then the positions of the fixing frames 20 are adjusted, and the corresponding vertical plates 12 that need to be maintained are unlocked and replaced or maintained.

Specifically, as shown in FIG. 7, the inner frames 16 are distributed at equal intervals, and transverse beams 21 are installed between the inner frames 16, and racks 23 and sleeve frames 22 are fixedly installed between the transverse beams 21. The inner side is provided with a slideway, and the bottom of the transverse beam 21 is provided with a driving frame 24, and the inner side of the driving frame 24 is connected with a gear 26, and the gear 26 is meshed with the rack 23, and both sides of the upper surface of the driving frame 24 are equipped with limit frames. 25. The limit frame 25 is inserted in the inner side of the slideway. The upper surface of the limit frame 25 is rotatably connected with balls. The balls are distributed at equal intervals. The balls fit the inner wall of the slideway. 11 fixed connections.

When it is necessary to maintain the discharge electrode 13 and the dust collection electrode 14, the gear 26 is driven to rotate by the operation of the drive frame 24, and the rack 23 is exerted force through the rotation of the gear 26, and the rack 23 exerts force on the sleeve frame 22. At this time, through the structural combination of the limit frame 25 and the slideway, the moving track of the sleeve frame 22 and the transverse beam 21 is limited, and the rotation of the ball makes the movement of the transverse beam 21 smoother. At this time, the sealing plate 11 follows the transverse beam 21 1. The movement of the cover frame 22 moves forward, and the vertical plate 12 moves to the outside of the outer frame 10 .

Specifically, as shown in Figure 8, the four corners of the lower surface of the base 4 are equipped with legs, the base 4 is set as a hollow structure, the bottom of the base 4 is equipped with a circulation pipe 27, and the circulation pipe 27 is fixedly connected with the water storage tank 5, and the base The inner side of 4 is equipped with a self-cleaning mechanism, and the self-cleaning mechanism includes a pressure plate 28. The four corners of the upper surface of the pressure plate 28 are all provided with hydraulic rods 29. , a pressure pump 30 is installed at the center of the upper surface of the pressing plate 28, the output end of the pressure pump 30 penetrates to the lower surface of the pressing plate 28, the lower surface of the pressing plate 28 is equipped with a filter bag 32, and the bottom end of the filtering bag 32 is equipped with a hollow frame 31 , The inboard of hollow frame 31 is equipped with blowdown controller 33, and the bottom surface side of base 4 is equipped with blowdown channel 34, and the output end of blowdown controller 33 is connected with blowdown track 34.

Start the pressure pump 30 to introduce the water flow into the filter bag 32, and through the expansion and contraction of the hydraulic rod 29, the pressure plate 28 will be moved down, and the pressure will be applied to the hollow frame 31 and the filter bag 32, so that the water body will pass through the filter bag 32 and pass through the circulation pipe. 27 returns to the water storage tank 5, so as to obtain the maximum internal circulation times of the water body, and the dust particles are discharged through the sewage controller 33 and the sewage channel 34.

A method for using an anode slime flue gas purification and selenium recovery system, comprising the following steps:

S1: During the operation of the wet electrostatic precipitator, the flue gas enters the inner side of the outer frame 10 and the sealing plate 11 through the upper frame 1, and is in contact with the vertical plate 12. For the output current of the discharge electrode 13 and the dust collection electrode 14, the discharge electrode 13 The DC high voltage between the dust collecting pole 14 makes the dusty flue gas passing through the two poles ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting pole 14 under the action of the electric field force , and is collected by the dust collection pole 14, so that the small particle ultrafine dust in the flue gas is purified, the gas enters the lower frame 2, and is discharged through the exhaust air channel 3, the booster pump 6 is started, and the water storage tank 5 The internal water body is sent to the inner channel 8 through the conveying pipeline 7, and is delivered to the atomizing nozzle 9 for atomization treatment, forming a water film on the surface of the vertical plate 12;

S2: The water film flows down along gravity, start the pressure pump 30, introduce the water flow into the inside of the filter bag 32, and through the expansion and contraction of the hydraulic rod 29, drive the pressure plate 28 to move down, and apply pressure to the hollow frame 31 and the filter bag 32, so that the water body is filtered The bag 32 filters and returns to the water storage tank 5 through the circulation pipe 27, so as to obtain a greater number of internal circulation of the water body, and the dust particles are discharged through the sewage discharge controller 33 and the sewage discharge channel 34;

S3: When it is necessary to maintain the discharge electrode 13 and the dust collection electrode 14, the gear 26 is driven to rotate through the operation of the drive frame 24, and the gear 26 is rotated to exert force on the rack 23, and the rack 23 exerts force on the sleeve frame 22 , at this time, through the structural combination of the limit frame 25 and the slideway, the moving tracks of the sleeve frame 22 and the transverse beam 21 are limited, and the rotation of the balls makes the movement of the transverse beam 21 smoother. At this time, the sealing plate 11 follows the transverse direction The movement of the beam 21 and the sleeve frame 22 moves forward, and the vertical plate 12 moves to the outside of the outer frame 10;

S4: Preliminarily limit the placement position of the vertical plate 12 through the support base 15, and cooperate with the fixing frame 20 to achieve the fixing function for the vertical plate 12, start the double-head motor 17, and drive the drive shaft 18 to rotate through the operation of the double-head motor 17 , and through the structural combination of threads and screw holes, the two sets of adjustment frames 19 are driven to move in opposite directions, and then the position of the fixing frame 20 is adjusted, and the corresponding vertical plate 12 that needs to be maintained is unlocked, and the related operations of replacing or maintaining it are as follows Can.

Working principle of wet electrostatic precipitator:

During the operation of the wet electrostatic precipitator, the flue gas enters the inner side of the outer frame 10 and the sealing plate 11 through the upper frame 1, contacts with the vertical plate 12, and outputs current to the discharge electrode 13 and the dust collector 14, and the discharge electrode 13 and the collector The DC high voltage between the dust electrodes 14 makes the dusty flue gas passing between the two electrodes ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting electrode 14 under the action of the electric field force, and It is captured by the dust collector 14, so that the small particles and ultrafine dust in the flue gas are purified, the gas enters the lower frame 2, and is discharged through the exhaust air channel 3, and the booster pump 6 is started to drain the water inside the water storage tank 5 Sent to the inner channel 8 through the delivery pipeline 7, and the atomization treatment is carried out by the atomization nozzle 9, forming a water film on the surface of the vertical plate 12, and the water film flows down along the gravity, and the pressure pump 30 is started to introduce the water flow into the inside of the filter bag 32, and Through the expansion and contraction of the hydraulic rod 29, the pressure plate 28 is driven to move down, and the pressure is applied to the hollow frame 31 and the filter bag 32, so that the water body is filtered through the filter bag 32 and returned to the water storage tank 5 through the circulation pipe 27, so as to maximize the water body. The number of internal cycles, the dust particles are discharged through the sewage controller 33 and the sewage channel 34. When the discharge electrode 13 and the dust collection electrode 14 need to be maintained, the operation of the drive frame 24 drives the gear 26 to rotate, and the rotation of the gear 26 Apply force to the rack 23, and the rack 23 exerts force on the sleeve frame 22. At this time, through the structural combination of the limit frame 25 and the slideway, the moving track of the sleeve frame 22 and the transverse beam 21 is limited, and the rotation of the ball , so that the transverse beam 21 moves more smoothly. At this time, the sealing plate 11 moves forward with the movement of the transverse beam 21 and the sleeve frame 22, and the vertical plate 12 moves to the outside of the outer frame 10. The placement position of the vertical plate 12 is initially determined by the support seat 15. Limit, and cooperate with the fixing frame 20 to achieve the fixing function for the vertical plate 12, start the double-head motor 17, drive the drive shaft 18 to rotate through the operation of the double-head motor 17, and drive two groups of adjustments through the combination of threads and screw holes The frame 19 moves in the opposite direction, and then adjusts the position of the fixed frame 20, unlocks the corresponding vertical plate 12 that needs to be maintained, and performs related operations of replacing or maintaining it.

As shown in Figures 10 to 13, the multi-element gravity settling chamber 101 includes a main frame body 1.1, a plurality of connected compartments 1.2 are arranged in the main frame body 1.1, and an airflow barrier is arranged between adjacent compartments 1.2 board 1.3, and a hopper 1.4 is provided at the bottom of each compartment 1.2, and a connecting pipe 1.5 is provided on the side of the main frame 1.1 close to the first-stage double-effect turbulent washing device 102, and a self-cleaning filter is provided at the connecting pipe 1.5 Mechanism 1.6, the self-cleaning filter mechanism 1.6 includes a rotating shaft 1.7 that is rotated on the side wall of the main frame body 1.1 close to the first-stage double-effect turbulent washing device 102, and one end of the rotating shaft 1.7 extends into the main frame body 1.1 is connected with a rotating disc 1.8, the other end of which extends out of the main frame 1.1 and is connected with a drive motor 1.9. The rotating disc 1.8 is provided with an annular filter area 1.10 along the direction of rotation, and the inner and outer areas of the annular filter area 1.10 The width between the diameters is less than or equal to the inner diameter of the connecting pipe 1.5, and when the drive motor 1.9 drives the rotating disk 1.8 to rotate, the annular filter area 1.10 is always located in front of the connecting pipe 1.5 to further filter the effect.

The lower half of the rotating disk 1.8 is provided with a casing 1.11, the casing 1.11 wraps the lower half of the rotating disk 1.8, and the casing 1.11 is fixed on the side of the main frame 1.1 close to the first-stage double-effect turbulent washing device 102 On the side wall, and the side wall is provided with an air inlet passage 1.12, the air inlet passage 1.12 is connected with a fan 1.13, and the fan 1.13 can blow off the particles accumulated in the annular filter area 1.10, avoiding annular filtration The mesh area 1.10 is blocked, which affects the flow of smoke into the follow-up device.

The upper end of the housing 1.11 is provided with a horizontal plate 1.12, and the horizontal plate 1.12 is provided with an opening adapted to the rotating disk 1.8, which does not affect the normal rotation of the rotating disk 1.8. The lower end of the housing 1.11 is provided with a particle outlet 1.13, and the particle The outlet 1.13 leads to the hopper 1.4, and the inner wall of the housing 1.11 facing the rotating disk 1.8 is set as an arc-shaped guide surface 1.14, and the arc-shaped guide surface 1.14 is integrated with the particle outlet 1.13. When the fan 1.13 can filter the annular filter area 1.10 The particles accumulated inside are blown off, and the particles can fall into the hopper 1.4 from the particle outlet 1.13 along the arc guide surface 1.14.

The opening on the horizontal plate 1.12 is provided with a scraper structure close to the outer wall of the rotating disk 1.8, and a rubber scraper or a brush can be used. When the rotating disk 1.8 rotates, the surface of the rotating disk 1.8 and the annular filter area 1.10 can be The soot or particles are scraped off, and part of the scraped soot or particles can also fall into the hopper 1.4 along the arc-shaped outer wall corresponding to the arc-shaped guide surface 1.14.

In the multi-element gravity settling chamber 101, some ultra-large particles, large specific gravity soot and anode slime particles fall into the bottom of the hopper of the element gravity settling chamber 101 through gravity and gas velocity to separate; after that, the self-cleaning filter mechanism 1.6 can further filter The finer particles and particles in the flue gas are filtered, and the filter mechanism can be self-cleaning, making the whole process smoother.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their effects.

Claims (10)

1. Anode slime flue gas purification and selenium recovery system, is characterized in that, Including: multi-element gravity settling chamber (101), first-level double-effect turbulent washing device (102), second-level double-effect turbulent washing device (103), high-efficiency phase change cooling tower (104), desulfurization absorption tower (106 ), wet electrostatic precipitator, exhaust pipe (108), induced draft fan (109), plate heat exchanger (110), primary slurry circulation tank (111), secondary slurry circulation tank (112), primary acid mud Chemical tank (113), secondary acid mud chemical tank (114), primary plate and frame filter press (115), secondary plate and frame filter press (116), primary turbulent circulation pump (117), secondary Turbulent circulation pump (118), cooling circulation pump (119), desulfurization absorption circulation pump (120), primary filter press pump (121), secondary filter press pump (122), primary acid sludge delivery pump (123) With the secondary acid mud delivery pump (124); Wet electrostatic precipitator: composed of a first-stage wet electrostatic precipitator (105) and a second-stage wet electrostatic precipitator (107), mainly using the direct current between the discharge electrode (13) and the dust collection electrode (14) of the electrostatic precipitator The high-voltage electricity makes the dusty flue gas passing between the two electrodes ionized, so that the dust particles in the flue gas are charged, and the charged dust particles move to the dust collecting pole (14) under the action of the electric field force, and are collected by the dust collecting pole. (14) is trapped, so that the small particle ultrafine dust in the flue gas is purified. 2. A kind of anode slime flue gas purification and selenium recovery system according to claim 1, is characterized in that, described wet electrostatic precipitator comprises upper frame (1) and lower frame (2), and described lower frame (2 ) is equipped with an exhaust air duct (3), the bottom end of the lower frame (2) is equipped with a base (4), and the rear end of the base (4) is equipped with a water storage tank (5), the storage The upper surface of the water tank (5) is equipped with a booster pump (6), and the output end of the booster pump (6) is equipped with a delivery pipe (7), and the output end of the delivery pipeline (7) runs through to the upper frame (1 ) inside. 3. A kind of anode slime flue gas purification and selenium recovery system according to claim 2, is characterized in that, the inner side of described upper frame (1) is equipped with inner channel (8), and the inner channel (8) of described conveying pipe (7) The output end is fixedly connected with the input end of the internal passage (8), and the internal passage (8) is set as a closed-loop structure, and the inner side of the internal passage (8) is equipped with an atomizing nozzle (9), and the atomizing nozzle ( 9) equally spaced distribution. 4. A kind of anode slime flue gas purification and selenium recovery system according to claim 2, is characterized in that, be positioned at same horizontal line between described upper frame (1) and lower frame (2), described upper frame (1) ) and the lower frame (2) are equipped with an outer frame (10), the front end of the outer frame (10) is provided with a sealing plate (11), and the inner side of the outer frame (10) is provided with a vertical plate (12) , The surface of the vertical plate (12) is evenly equipped with discharge electrodes (13) and dust collection electrodes (14), which are symmetrically distributed between the discharge electrodes (13) and dust collection electrodes (14). 5. A kind of anode slime flue gas purification and selenium recovery system according to claim 4, it is characterized in that, the outer surface of the bottom end of the vertical plate (12) is covered with a support seat (15), and the support seat The lower surface of (15) is equipped with inner frame (16), and the inner center position of described inner frame (16) is equipped with double-headed motor (17), and the first output terminal of described double-headed motor (17) is connected with the second The output ends are equipped with drive shafts (18), the front and rear ends of the lower surface of the support base (15) are slidingly connected with adjustment frames (19), and the upper surface of the adjustment frame (19) is equipped with a fixed frame (20). , the fixed frame (20) is sleeved on the outer surface of the vertical plate (12), the front end of the adjustable frame (19) is provided with screw holes, and the outer surface of the drive shaft (18) is provided with threads, so The drive shaft (18) engages with the screw hole through threads. 6. A kind of anode slime flue gas purification and selenium recovery system according to claim 5, is characterized in that, is equidistant distribution between described inner frame (16), is housed between described inner frame (16) A transverse beam (21), a rack (23) and a sleeve frame (22) are fixedly installed between the transverse beams (21), and a slideway is provided on the inner side of the sleeve frame (22), and the transverse beam (21 ) is provided with a driving frame (24) below, and the inner side of the driving frame (24) is connected with a gear (26), and the gear (26) is meshed with the rack (23), and the driving frame (24) Limiting frames (25) are installed on both sides of the upper surface of the upper surface, and the limiting frame (25) is inserted in the inner side of the slideway. The upper surface of the limiting frame (25) is connected with balls in rotation, and the balls are connected to each other. The balls are distributed at equal intervals, the balls are attached to the inner wall of the slideway, and the sleeve frame (22) is fixedly connected with the sealing plate (11). 7. A kind of anode slime flue gas purification and selenium recovery system according to claim 2, characterized in that, the four corners of the lower surface of the base (4) are equipped with feet, and the base (4) is set as hollow structure, the bottom end of the base (4) is equipped with a circulation pipe (27), the circulation pipe (27) is fixedly connected with the water storage tank (5), and the inner side of the base (4) is equipped with a self-cleaning mechanism. 8. A kind of anode mud flue gas purification and selenium recovery system according to claim 7, it is characterized in that, described self-cleaning mechanism comprises pressing plate (28), and the upper surface four corners of described pressing plate (28) are all provided with A hydraulic rod (29), the hydraulic rod (29) is fixedly connected to the inside of the base (4), the pressure plate (28) is slidably connected to the inside of the base (4), and the center position of the upper surface of the pressure plate (28) A pressure pump (30) is installed, and the output end of the pressure pump (30) penetrates to the lower surface of the pressing plate (28). 9. a kind of anode slime flue gas purification and selenium recovery system according to claim 8, is characterized in that, the lower surface of described pressing plate (28) is equipped with filter bag (32), and the filter bag (32) A hollow frame (31) is installed at the bottom, a sewage discharge controller (33) is provided on the inside of the hollow frame (31), and a sewage discharge channel (34) is provided on the lower surface side of the base (4). The output end of the controller (33) is connected with the sewage channel (34). 10. A method for using an anode slime flue gas purification and selenium recovery system, comprising the following steps: S1: During the operation of the wet electrostatic precipitator, the flue gas enters the inner side of the outer frame (10) and the sealing plate (11) through the upper frame (1), and contacts with the vertical plate (12). For the discharge electrode (13) and The dust collector (14) outputs current, and the DC high voltage between the discharge electrode (13) and the dust collector (14) makes the dusty flue gas passing between the two electrodes ionized, thereby charging the dust particles in the flue gas. The charged dust particles move to the dust collection pole (14) under the action of the electric field force, and are captured by the dust collection pole (14), so that the small particles and ultrafine dust in the flue gas are purified, and the gas enters the lower frame ( 2), and discharge through the exhaust air passage (3), start the booster pump (6), send the water inside the water storage tank (5) to the inner passage (8) through the delivery pipe (7), and deliver it to the atomizing nozzle ( 9) performing atomization treatment to form a water film on the surface of the vertical plate (12); S2: The water film flows down along the gravity, start the pressure pump (30), introduce the water flow into the inside of the filter bag (32), and through the expansion and contraction of the hydraulic rod (29), drive the pressure plate (28) to move down, and the hollow frame (31) and The filter bag (32) exerts pressure so that the water body is filtered through the filter bag (32), and returns to the water storage tank (5) through the circulation pipe (27), so as to obtain a maximum number of internal circulation of the water body, and the dust particles pass through the sewage controller (33) and sewage channel (34) discharge; S3: When it is necessary to maintain the discharge electrode (13) and the dust collection electrode (14), the gear (26) is driven to rotate through the operation of the drive frame (24), and the gear rack (23) is rotated through the rotation of the gear (26) Force is applied, the rack (23) exerts force on the sleeve frame (22), at this time, the moving track of the sleeve frame (22) and the transverse beam (21) is limited by the structural combination of the limit frame (25) and the slideway , and through the rotation of the ball, the transverse beam (21) moves more smoothly. At this time, the sealing plate (11) moves forward with the movement of the transverse beam (21) and the sleeve frame (22), and the vertical plate (12) moves to the outer frame (10) outside; S4: Preliminarily limit the placement position of the vertical plate (12) through the support seat (15), and cooperate with the fixing frame (20) to achieve the fixing function for the vertical plate (12), start the double-head motor (17), and pass the double-headed motor (17). The operation of the head motor (17) drives the drive shaft (18) to rotate, and through the combination of threads and screw holes, it drives the two sets of adjustment frames (19) to move in opposite directions, and then adjusts the position of the fixing frame (20). The corresponding vertical plate (12) is unlocked, and the related operations of replacing or maintaining it get final product.