CN110508124A - High-concentration industrial flue gas semi-dry purification treatment system and its process method - Google Patents

Abstract

The invention discloses a high-concentration industrial flue gas semi-dry purification treatment system and a process method thereof, comprising a denitrification unit, a dust removal unit and a desulfurization unit; the inlet end of the denitrification unit communicates with the boiler outlet end; It is connected with the inlet end of the dust removal unit; the outlet end of the dust removal unit is connected with the inlet end of the desulfurization unit; the desulfurization unit includes a desulfurization tower and a mixing chamber; the mixing chamber is connected to the desulfurization tower along the flue gas flow path Upstream; the mixing chamber is filled with desulfurizer powder; the desulfurization tower includes a reaction chamber; the reaction chamber is placed vertically, with an air inlet at the top and an air outlet at the bottom; There is a first gas mixing assembly; the first gas mixing assembly includes a gas gathering ring, a dispersion disc and a second flow hood; before the desulfurization reaction occurs, the uniformity of the mixed flue gas doped with desulfurization agent powder is adjusted, thereby Improve the efficiency of subsequent reactions.

Description

High-concentration industrial flue gas semi-dry purification treatment system and its process method

technical field

The invention relates to the field of flue gas treatment, in particular to a semi-dry purification treatment system for high-concentration industrial flue gas.

Background technique

As one of the common methods of flue gas desulfurization and denitrification, the semi-dry method is widely used because of its high desulfurization efficiency. However, the uniformity of desulfurization agent powder doping in traditional semi-dry equipment is not high, the loss is large, and the recovery of desulfurization reaction products is troublesome, which reduces the desulfurization and denitrification efficiency of the equipment. Therefore, it is necessary to invent a high-concentration industrial flue gas semi-dry purification treatment system with high material utilization rate and convenient product recovery.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a high-concentration industrial flue gas semi-dry purification treatment system with high material utilization rate and convenient product recovery.

Technical solution: In order to achieve the above purpose, the high-concentration industrial flue gas semi-dry purification treatment system of the present invention includes a denitrification unit, a dust removal unit and a desulfurization unit; the inlet end of the denitrification unit is connected to the outlet end of the boiler; the denitrification unit The outlet end of the dust removal unit is connected with the inlet end of the dust removal unit; the outlet end of the dust removal unit is connected with the inlet end of the desulfurization unit;

The desulfurization unit includes a desulfurization tower and a mixing chamber; the mixing chamber is connected and arranged upstream of the desulfurization tower along the flue gas flow path; the mixing chamber is filled with desulfurizing agent powder; the desulfurization tower includes a reaction chamber; The reaction chamber is placed vertically, the top is provided with an air inlet, and the bottom is provided with an air outlet; the reaction chamber is provided with a first gas mixing assembly; the first gas mixing assembly includes a gas gathering ring, a dispersing disc and The second flow hood; the gas gathering ring is arranged at one end of the reaction chamber close to the air inlet; the outer edge of the gas gathering ring is correspondingly connected with the inner wall of the reaction chamber; the center of the gas gathering ring is provided with a second A flow hole; the dispersing disk is arranged below the gas gathering ring; a drainage dome is arranged at the center of the upper end of the dispersing disk; the drainage dome corresponds to the position of the first circulation hole in the vertical direction; the dispersing The edge of the disk is evenly provided with second flow holes in the circumferential direction; the second flow uniform cover is arranged under the dispersion disk; the concave surface of the second flow uniform cover faces upward, and a number of third flow holes are arranged on the surface; the reaction chamber A number of air injection blocks are arranged circumferentially and symmetrically on the side wall; the air injection blocks are vertically located between the dispersing disk and the second hood; the outlet end of the first air injection block faces its own distribution center.

Further, the reaction chamber is also provided with a second gas mixing assembly; the second gas mixing assembly includes a first flow uniformity cover and a second flow uniformity cover; the concave surface of the first flow distribution cover and the second flow distribution cover The concave surfaces of the flow hoods are oppositely arranged; the first flow hood is located above the corresponding second flow hood; several pairs of the first flow hoods and the second flow hoods are distributed at intervals along the vertical direction; the first flow hoods of the same pair A desulfurization plate group is arranged between the first flow hood and the second flow hood; the desulfurization plate group is provided with a water mist generator; the side wall of the reaction chamber is provided with a replacement window; the replacement window is in the horizontal direction The upper part corresponds to the position of the desulfurization plate group.

Further, the desulfurization plate group includes a unit plate and a frame; the frame is correspondingly clamped on the periphery of the unit plate; several of the unit plates are arranged parallel to each other at intervals; the surface of the unit plate is provided with a plurality of third flow holes ; The third flow hole on the adjacent unit plate is staggered in the vertical direction; the water mist generator is installed on the side of the frame member close to the replacement window; the surface of the unit plate is embedded with a spray pipe; The spray pipes communicate with each other, and the gaps between the third flow holes are evenly distributed in a mesh shape; the spray pipes communicate with the outlet end of the water mist generator; the surface of the spray pipes faces away from the side of the embedded plate One side is provided with injection holes; several injection holes are evenly distributed along the length direction of the injection pipe.

Further, the mixing chamber includes a bin body; the top of the bin body is provided with a feed port; the bottom of the bin body is provided with a discharge port; the bottom of the discharge port is connected with an auxiliary bin; There is a dial embedded in the opening; the rotation range of the dial corresponds to the opening of the discharge port; the auxiliary chamber is sealed and arranged outside the dial; the auxiliary chambers on both sides of the dial are respectively connected with wind cylinder and conveying pipe; the air outlet of the air cylinder corresponds to the position of the dial; the inlet end of the conveying pipe is correspondingly arranged on the air outlet path of the air cylinder; the outlet end of the conveying pipe communicates with the air inlet.

Further, the dial includes a shaft body and blades; the shaft body is rotatably matched with the side wall of the discharge port; the blades are evenly distributed on the side of the shaft body in the circumferential direction; grooves are provided on both sides of the blades; The length direction of the material chute is consistent with the air outlet path of the air duct.

Further, a sealing end cover is fitted at the feed inlet; a limiting ring groove is horizontally arranged on the inner wall of the bin; a strip window is provided through the side wall of the bin body; the interior of the strip window is matched with A baffle is embedded; the baffle moves back and forth through the strip window, and the moving path corresponds to the cross-section of the bin; the baffle cooperates with the limit ring groove to separate the space in the upper and lower bins.

Further, a heat exchange pipeline is arranged in the wall surface of the delivery pipe; the inlet end of the heat exchange pipeline is connected with the water source; the outlet end of the heat exchange pipeline is connected with the inlet end of the water mist generator; the The surface of the inner wall of the delivery pipe is bonded with a heat conduction pad.

Further, the process method of the high-concentration industrial flue gas semi-dry purification treatment system includes the following steps,

Step 1: The flue gas produced by the boiler combustion first undergoes denitrification and dust removal, and then enters the desulfurization unit; the dial wheel is driven to rotate, and the desulfurizer powder in the bin is transferred to the auxiliary bin space; the flue gas flows into the auxiliary bin through the air duct Inside, the desulfurizer powder is entrained into the reaction chamber;

Step 2: After the mixed flue gas containing desulfurizer powder enters the reaction chamber, it is first concentrated to the center of the reaction chamber under the action of the gas gathering ring. During this concentration process, the distribution uniformity of the desulfurizer powder in the flue gas is improved. promoted;

Step 3, the mixed smoke after passing through the first flow hole of the gas gathering ring continues to flow, hits the drainage dome at the center of the upper surface of the dispersion plate, then diffuses around the dispersion plate and passes through the second flow hole, Then it is pushed by the airflow of the jet block and gathers again; in this gathering process, the desulfurizer powder and flue gas complete the second mixing, and the uniformity is further improved;

Step 4, the mixed flue gas continues to flow, and is transferred from the first gas mixing component to the second gas mixing component; the mixed smoke passes through the combination of multiple sets of first flow hoods and second flow hoods in turn to achieve staged Multiple re-mixing processes; at the same time, the third flow hole on the unit plate passes through the position between the first and second flow hoods of each group, and contacts with the water mist sprayed from the injection pipe, and the desulfurization reaction occurs , the products generated by the reaction fall to the surface of the unit plate, and the remaining mixed flue gas continues to circulate, and desulfurizes in the action area of different unit plates in turn;

Step five, the desulfurized flue gas leaves the desulfurization unit through the gas outlet, and is discharged into a space outside the purification treatment system through a connected chimney.

Beneficial effects: the high-concentration industrial flue gas semi-dry purification treatment system of the present invention includes a denitrification unit, a dust removal unit and a desulfurization unit; the inlet end of the denitrification unit is connected to the boiler outlet end; The inlet end of the unit is connected; the outlet end of the dedusting unit is connected with the inlet end of the desulfurization unit; the desulfurization unit includes a desulfurization tower and a mixing chamber; the mixing chamber is arranged upstream of the desulfurization tower along the flue gas flow path; The mixing chamber is filled with desulfurizer powder; the desulfurization tower includes a reaction chamber; the reaction chamber is placed vertically, with an air inlet on the top and an air outlet on the bottom; A gas-mixing component; the first gas-mixing component includes a gas-gathering ring, a dispersing disc and a second flow hood; before the desulfurization reaction occurs, the uniformity of the mixed flue gas doped with desulfurizing agent powder is adjusted, thereby improving the subsequent The efficiency of the reaction.

Description of drawings

Accompanying drawing 1 is a schematic diagram of the overall flow of flue gas treatment;

Accompanying drawing 2 is a schematic diagram of the internal structure of the desulfurization tower;

Accompanying drawing 3 is the schematic diagram of gas flow path inside the desulfurization tower;

Accompanying drawing 4 is the structure diagram of desulfurization plate group;

Accompanying drawing 5 is the structural representation of mixing chamber;

Accompanying drawing 6 is a schematic diagram of the working principle of the mixing chamber.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

The high-concentration industrial flue gas semi-dry purification treatment system, as shown in Figure 1, includes a denitrification unit 2, a dust removal unit 5, and a desulfurization unit 7; the inlet end of the denitrification unit 2 is connected to the boiler outlet end; the denitrification unit The outlet end of 2 is communicated with the inlet end of dedusting unit 5; the outlet end of described dedusting unit 5 is communicated with the inlet end of desulfurization unit 7; the flue gas that boiler 1 produces is first mixed with the ammonia gas transported in liquid ammonia evaporation unit 8, Then enter the denitrification unit 2 for denitrification reaction, then the flue gas continues to flow to the heat exchanger 3 for cooling, and then passes through the dust removal unit 5 to filter out solid particles, and then enters the desulfurization unit 7 for desulfurization reaction; the flue gas that has completed the desulfurization reaction passes through the chimney The products produced in the desulfurization reaction enter the product processing unit 6 for reuse; among them, the denitrification unit 2 can purchase the SCR denitrification equipment scheme on the market; the typical desulfurizer in the desulfurization unit 7 is CaO, and its product CaSO ₄ In the product processing unit 6, it is used for doping in concrete blocks and used as building materials.

The desulfurization unit 7 includes a desulfurization tower 71 and a mixing chamber 72; the mixing chamber 72 is connected and arranged upstream of the desulfurization tower 71 along the flue gas flow path; the mixing chamber 72 is filled with a desulfurizer powder 701; as As shown in Figure 2, the desulfurization tower 71 includes a reaction chamber 711; the reaction chamber 711 is placed vertically, the top is provided with an air inlet 712, and the bottom is provided with an air outlet 713; the reaction chamber 711 is provided with a first The gas mixing component 73 is used to adjust the uniformity of the mixed flue gas doped with the desulfurization agent powder 701 before the desulfurization reaction occurs, so as to improve the efficiency of the subsequent reaction;

The first gas mixing assembly 73 includes a gas gathering ring 731, a dispersing disc 732 and a second uniform flow cover 733; the gas gathering ring 731 is arranged at one end of the reaction chamber 711 near the air inlet 712; The outer edge of the balloon member 731 is correspondingly connected with the inner wall of the reaction chamber 711; the center of the gas gathering ring member 731 is provided with a first flow hole 734; this ring-shaped structure can gather the mixed smoke entering the reaction chamber 711 once; The dispersing disc 732 is arranged under the gas gathering ring 731; the center of the upper end of the dispersing disc 732 is provided with a drainage dome 735, whose function is to break apart the gathered mixed smoke and disperse it to the edge of the dispersing disc 732 , so as to complete a gathering-dispersion mixing process through air agitation;

The drainage dome 735 corresponds to the position of the first flow hole 734 in the vertical direction; the second flow hole 736 is evenly arranged on the edge of the dispersion plate 732; the second flow uniform cover 733 is arranged on the dispersion plate 732 below; the concave surface of the second flow uniform cover 733 faces upwards, and a number of third flow holes 737 are arranged on the surface; a number of air injection blocks 715 are arranged circumferentially and symmetrically on the side wall of the reaction chamber 711; the air injection blocks 715 are arranged vertically It is located between the dispersing disc 732 and the second flow hood 733 in the vertical direction; the outlet end of the first air injection block 715 faces the center of its own distribution; the air is introduced through the air injection block 715 to dilute the mixed smoke once, thereby Reducing the content of desulfurizer powder in the mixed flue gas can avoid the waste of untimely reaction caused by too high powder content; at the same time, the air injection block 715 can flow down from the second flow hole 736 through the air flow aimed at the center. The mixed flue gas promotes the concentration, so as to realize the homogenization process of convective agitation during dynamic dilution and re-concentration;

The reaction chamber 711 is also provided with a second gas mixing assembly 74, which is used for multi-stage desulfurization of the mixed flue gas; the second gas mixing assembly 74 includes a first flow uniform cover 741 and a second flow uniform cover 733 The concave surface of the first flow uniform cover 741 is opposite to the concave surface of the second flow uniform cover 733; the first flow uniform cover 741 is located above the corresponding second flow uniform cover 733; several pairs of the first flow uniform cover The hood 741 and the second flow hood 733 are distributed at intervals along the vertical direction; a desulfurization plate group 75 is arranged between the first hood 741 and the second hood 733 of the same pair, so that the mixed flue gas evenly passes through the first hood. The desulfurization reaction can be carried out immediately after the first flow hood 741, and can be homogenized again through the second flow hood 733 after the first desulfurization reaction, so as to prepare for the next reaction; the desulfurization plate group 75 is provided with a water mist generator 76, taking CaO as the desulfurizer as an example, SO ₂ in the mixed flue gas meets water to form H ₂ SO ₃ , CaO reacts with H ₂ SO ₃ to form CaSO ₃ , CaO meets water to form CaOH, and CaSO ₃ reacts with CaOH to form CaSO ₃ , and further oxidized to CaSO ₄ ; the side wall of the reaction chamber 711 is provided with a replacement window 702; the replacement window 702 corresponds to the position of the desulfurization plate group 75 in the horizontal direction; On the plate surface, the desulfurization plate group 75 can be replaced by the replacement window 702 in the flue gas conveying gap, so that the product can be collected conveniently and quickly;

As shown in Figure 4, the desulfurization plate group 75 includes a unit plate 751 and a frame 752; the frame 752 is correspondingly clamped on the periphery of the unit plate 751; several of the unit plates 751 are arranged in parallel with each other; the unit The surface of the plate 751 is provided with a number of third flow holes 753; the third flow holes 753 on the adjacent unit plate 751 are staggered in the vertical direction, so that each time the desulfurization reaction product falls, it can be removed by the front plate surface. interception, increase the residence time of the mixed flue gas, and improve the reaction efficiency; the water mist generator 76 is installed on the side of the frame 752 close to the replacement window 702, and is installed and replaced synchronously with the corresponding desulfurization plate group 75, eliminating the need for The steps of frequent disassembly only need to reconnect the relevant pipelines; the surface of the unit plate 751 is embedded with injection pipes 755; Parts are evenly distributed in a net shape, so that the reaction area on the unit plate 751 can be effectively covered; the spray pipe 755 is communicated with the outlet end of the water mist generator 76; the surface of the spray pipe 755 faces away from the embedded plate surface. Spray holes are arranged on the side; several of the spray holes are evenly spaced along the length direction of the spray pipe 755 .

As shown in Figure 5, the mixing chamber 72 includes a bin body 721; the top of the bin body 721 is provided with a feed port 722; the bottom of the bin body 721 is provided with a discharge port 723; the discharge port 723 An auxiliary chamber is connected to the bottom to provide a closed space for the mixing of desulfurizer powder and flue gas; a dial 77 is embedded at the discharge port 723; the rotation range of the dial 77 is the same as the opening of the discharge port 723 Correspondingly, the desulfurizer powder in the bin body 721 is transferred out through its own rotation. The outer side of the wheel 77; the auxiliary warehouses on both sides of the dial 77 are respectively connected with an air duct 724 and a delivery pipe 725; the air outlet of the air duct 724 corresponds to the position of the dial 77, and the dial 77 is driven The conveyed powder is blown away in time to complete the mixing of the two; the inlet end of the conveying pipe 725 is correspondingly arranged on the air outlet path of the air cylinder 724; the outlet end of the conveying pipe 725 communicates with the air inlet 712.

The dial 77 includes a shaft body 771 and blades 772; the shaft body 771 is in rotation with the side wall of the discharge port 723; the blades 772 are evenly distributed on the side of the shaft body 771 in the circumferential direction; A material trough 773 is provided to make the powder distribution on the surface of the blade 772 more uniform; the length direction of the material trough 773 is consistent with the air outlet path of the air cylinder 724;

A sealing end cover 726 is provided at the feed port 722; a limit ring groove 727 is horizontally provided on the inner wall of the bin body 721; a strip window 728 is provided through the side wall of the bin body 721; A baffle 729 is embedded in the window 728; the baffle 729 moves back and forth through the strip window 728, and the moving path corresponds to the cross section of the bin body 721; the baffle 729 is matched with the limit ring groove 727, Separate the inner space of the upper and lower bin bodies 721; as shown in accompanying drawing 6, part (a) in the figure represents the initial state of the bin body 721, at this time the dial 77 is working normally, and the bin body 721 is filled with desulfurizer powder, and at the same time, The vacant space below the baffle plate 729 is greater than the vacant space above the baffle plate 729; then as shown in part (b) of the figure, open the sealing end cover 726, and add a new batch of desulfurizer powder in the bin body 721; then as shown in the figure As shown in part (c) in the middle, first close the sealing end cover 726, and then pull out the baffle plate 729, and the new desulfurization powder will be combined with the original powder after falling; finally, as shown in part (d) of the figure, Re-insert the baffle 729 back to its original position, and start a new cycle after the powder inventory below it is shown in part (a) of the figure; Because of the huge height difference, more suspended particles will be produced, resulting in waste of materials and increased cleaning workload; and through the buffer of the baffle plate 729, the dumping height difference is significantly reduced, and then the baffle 721 is closed when the bin body 721 is closed. The powder in the upper and lower parts of the plate 729 is merged, which prevents the leakage of suspended particles.

A heat exchange pipeline is arranged in the wall surface of the delivery pipe 725; the inlet end of the heat exchange pipeline is communicated with the water source; the outlet end of the heat exchange pipeline is communicated with the inlet end of the water mist generator 76, which can improve participation The temperature of the water mist in the desulfurization reaction, coupled with the heating effect during the fogging process of ultrasonic vibration, can make the temperature of the water mist close to the temperature of the mixed flue gas, thereby making the ambient temperature of the entire desulfurization reaction more stable; the delivery pipe The surface of the inner wall of 725 is fitted with a heat conduction cushion, and the heating effect can be adjusted to a certain extent through the thickness of the heat conduction cushion, so as to better meet the process requirements.

A process method for a high-concentration industrial flue gas semi-dry purification treatment system, comprising the following steps,

Step 1, the flue gas generated by the combustion of the boiler 1 is denitrified and dust-removed first, and then enters the desulfurization unit 7; the dial wheel 77 is driven to rotate, and the desulfurizer powder 701 in the bin body 721 is transferred to the auxiliary bin space; the flue gas is The blower 724 flows into the auxiliary chamber, entraining the desulfurizer powder 701 into the reaction chamber 711;

Step 2, as shown in Figure 3, the arrow in the figure indicates the flow direction of the mixed flue gas; after the mixed flue gas containing desulfurizer powder 701 enters the reaction chamber 711, it is first concentrated to the reaction chamber under the action of the gas gathering coil 731. The central position of the cavity 711, the distribution uniformity of the desulfurizer powder 701 in the flue gas is improved during this concentration process;

Step 3, the mixed smoke after passing through the first flow hole 734 of the gas gathering ring 731 continues to flow, hits the drainage dome 735 at the center of the upper surface of the dispersing disc 732, and then diffuses around the dispersing disc 732 and passes through The second flow hole 736 is then pushed by the airflow of the air injection block 715, and gathers again; during this gathering process, the desulfurizer powder 701 and the flue gas complete the second mixing, and the uniformity is further improved;

Step 4, the mixed flue gas continues to flow, and is transferred from the first gas mixing assembly 73 to the second gas mixing assembly 74; the mixed smoke passes through the combination of multiple sets of first flow hoods 741 and second flow hoods 733 in sequence, Realize the staged multiple re-mixing process; at the same time, pass through the third flow hole 753 on the unit plate 751 between the first uniform flow cover 741 and the second flow cover 733 of each group, and spray with the injection pipe 755 The desulfurization reaction occurs in contact with the water mist emitted, and the product generated by the reaction falls to the surface of the unit plate 751, and the remaining mixed flue gas continues to circulate, and desulfurizes in the action area of different unit plates 751 in sequence;

Step 5, the desulfurized flue gas leaves the desulfurization unit 7 through the gas outlet 713, and is discharged into the space outside the purification treatment system through the connected chimney.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (8)

1. High-concentration industrial flue gas semi-dry purification treatment system, characterized in that: it includes a denitrification unit (2), a dust removal unit (5) and a desulfurization unit (7); the inlet end of the denitrification unit (2) and the boiler outlet The end is connected; the outlet end of the denitrification unit (2) is connected with the inlet end of the dedusting unit (5); the outlet end of the dedusting unit (5) is connected with the inlet end of the desulfurization unit (7); The desulfurization unit (7) includes a desulfurization tower (71) and a mixing chamber (72); the mixing chamber (72) is arranged upstream of the desulfurization tower (71) along the flue gas flow path; the mixing chamber ( 72) Desulfurizer powder (701) is installed inside; the desulfurization tower (71) includes a reaction chamber (711); the reaction chamber (711) is placed vertically, with an air inlet (712) at the top and a There is an air outlet (713); the reaction chamber (711) is provided with a first gas mixing assembly (73); the first gas mixing assembly (73) includes a gas gathering ring (731), a dispersion disc (732) and the second uniform flow cover (733); the gas gathering circle part (731) is arranged on one end near the air inlet (712) in the reaction chamber (711); the outer edge of the gas gathering circle part (731) and the reaction The inner walls of the cavity (711) are connected correspondingly; the center of the gas gathering ring (731) is provided with a first flow hole (734); the dispersion disc (732) is arranged below the gas gathering ring (731); the dispersion A drainage dome (735) is provided at the center of the upper end of the disc (732); the drainage dome (735) corresponds to the position of the first flow hole (734) in the vertical direction; the ring at the edge of the dispersion disc (732) The second flow hole (736) is evenly arranged in the direction; the second flow uniform cover (733) is arranged under the dispersion plate (732); the concave surface of the second flow uniform cover (733) faces upward, and several first Three flow holes (737); on the side wall of the reaction chamber (711), several air injection blocks (715) are arranged symmetrically in the circumferential direction; Between the hoods (733); the outlet end of the first air injection block (715) is distributed toward the center of itself. 2. The high-concentration industrial flue gas semi-dry purification treatment system according to claim 1, characterized in that: a second gas mixing component (74) is also arranged in the reaction chamber (711); The gas assembly (74) includes a first flow distribution cover (741) and a second flow distribution cover (733); the concave surface of the first flow distribution cover (741) is opposite to the concave surface of the second flow distribution cover (733); The first flow distribution cover (741) is located above the corresponding second flow distribution cover (733); several pairs of the first flow distribution cover (741) and the second flow distribution cover (733) are distributed vertically at intervals ; A desulfurization plate group (75) is arranged between the first flow hood (741) and the second flow hood (733) of the same pair; the desulfurization plate group (75) is provided with a water mist generator (76) ; The side wall of the reaction chamber (711) is provided with a replacement window (702); the replacement window (702) corresponds to the position of the desulfurization plate group (75) in the horizontal direction. 3. The semi-dry purification treatment system for high-concentration industrial flue gas according to claim 2, characterized in that: the desulfurization plate group (75) includes a unit plate (751) and a frame (752); the frame (752) The corresponding card is arranged on the periphery of the unit plate (751); several of the unit plates (751) are arranged parallel to each other at intervals; the surface of the unit plate (751) is provided with a number of third flow holes (753); The third flow hole (753) on the unit plate (751) is staggered in the vertical direction; the water mist generator (76) is installed on the side of the frame (752) close to the replacement window (702); the Injection tubes (755) are embedded on the surface of the unit plate (751); several of the injection tubes (755) communicate with each other, and the gaps between the third flow holes (753) are evenly distributed in a network; the injection tubes (755) is communicated with the outlet end of water mist generator (76); Described injection pipe (755) surface is provided with injection holes on the side facing away from the embedded plate surface; ) are evenly spaced along the length direction. 4. The high-concentration industrial flue gas semi-dry purification treatment system according to claim 2, characterized in that: the mixing chamber (72) includes a bin body (721); the top of the bin body (721) is provided with A feed port (722); a discharge port (723) is provided at the bottom of the warehouse body (721); an auxiliary warehouse is connected to the lower part of the discharge port (723); the discharge port (723) is embedded There is a dial (77); the rotation range of the dial (77) is matched with the opening of the discharge port (723); the auxiliary chamber seal is arranged on the outside of the dial (77); the dial of the dial (77) An air duct (724) and a delivery pipe (725) are connected to the auxiliary warehouses on both sides respectively; the air outlet of the air duct (724) corresponds to the position of the dial (77); the inlet of the delivery pipe (725) The end is correspondingly arranged on the air outlet path of the air cylinder (724); the outlet end of the delivery pipe (725) communicates with the air inlet (712). 5. The high-concentration industrial flue gas semi-dry purification treatment system according to claim 4, characterized in that: the dial (77) includes a shaft body (771) and blades (772); the shaft body (771 ) and the side wall of the discharge port (723) are rotated and matched; the blades (772) are evenly distributed on the side of the shaft body (771) in the circumferential direction; the two sides of the blades (772) are provided with troughs (773); The length direction of the trough (773) is consistent with the air outlet path of the air cylinder (724). 6. The semi-dry purification treatment system for high-concentration industrial flue gas according to claim 4, characterized in that: a sealing end cover (726) is provided at the feed inlet (722); the bin body (721 ) is horizontally provided with a limit ring groove (727) on the inner wall; a strip window (728) is provided through the side wall of the warehouse body (721); a baffle (729) is embedded in the strip window (728) ); the baffle (729) moves back and forth through the strip window (728), and the moving path corresponds to the cross section of the bin body (721); the baffle (729) is matched with the limit ring groove (727) correspondingly , The upper and lower warehouse body (721) inner space is separated. 7. The semi-dry purification treatment system for high-concentration industrial flue gas according to claim 4, characterized in that: a heat exchange pipeline is arranged in the wall of the delivery pipe (725); the inlet end of the heat exchange pipeline is It is connected with the water source; the outlet end of the heat exchange pipeline is connected with the inlet end of the water mist generator (76); the inner wall surface of the delivery pipe (725) is fitted with a heat conduction pad. 8. The process method of the high-concentration industrial flue gas semi-dry purification treatment system according to claim 1-7, characterized in that: comprising the following steps, Step 1, the flue gas produced by the combustion of the boiler (1) is denitrified and dust-removed first, and then enters the desulfurization unit (7); the dial wheel (77) is driven to rotate, and the desulfurizer powder (701) in the bin body (721) is Transfer to the auxiliary warehouse space; the flue gas flows into the auxiliary warehouse from the air duct (724), entraining the desulfurizer powder (701) into the reaction chamber (711); Step 2, after the mixed flue gas containing the desulfurizer powder (701) enters the reaction chamber (711), it is first concentrated to the center of the reaction chamber (711) under the action of the gas gathering coil (731). The distribution uniformity of the desulfurizer powder (701) in the flue gas is improved; Step 3, the mixed smoke after passing through the first flow hole (734) of the gas gathering ring (731) continues to flow, hits the drainage dome (735) at the center of the upper surface of the dispersion disc (732), and then flows to The dispersing disc (732) diffuses around and passes through the second flow hole (736), and then is pushed by the airflow of the air injection block (715) to gather again; during this gathering process, the desulfurizer powder (701) and flue gas complete The second mixing, the uniformity is further improved; Step 4, the mixed flue gas continues to flow, and is transferred from the first gas mixing assembly (73) to the second gas mixing assembly (74); these mixed flue gases pass through multiple sets of first uniform flow hoods (741) and second uniform flow hoods in turn. The combination of flow hoods (733) realizes a staged multiple remixing process; at the same time, it passes through the unit plate (751) at the position between each group of first flow hoods (741) and second flow hoods (733) The third flow hole (753) and contact with the sprayed water mist from the injection pipe (755), a desulfurization reaction occurs, the reaction product falls to the surface of the unit plate (751), and the remaining mixed flue gas continues to circulate. Carry out desulfurization sequentially and in different unit plate (751) action areas; Step 5, the desulfurized flue gas leaves the desulfurization unit (7) through the gas outlet (713), and is discharged into a space outside the purification treatment system through a connected chimney.