A flue gas CO 2 Recovery device and process

Abstract

The invention discloses a CO2 recovery device and process in flue gas, including a desulfurization box and a recovery box, a connecting pipe is sleeved between the side walls of the desulfurization box and the recovery box, an air inlet is opened at the bottom of the outer wall of the desulfurization box, an exhaust fan is installed in the air inlet, a plurality of mesh plates are clamped on the inner wall of the desulfurization box, a guide box is installed on the inner wall of the recovery box close to the connecting pipe, a plurality of nozzles are installed on the top of the guide box, a conveyor mesh belt is rotatably installed between the inner wall of the recovery box, a driving mechanism is installed between the conveyor mesh belt and the desulfurization box, a drying mechanism is installed between the conveyor mesh belt and the bottom of the recovery box, and an air outlet is opened at one end of the recovery box away from the connecting pipe. After the flue gas is filtered, it is desulfurized by reacting with calcium carbonate, and then the waste heat of the flue gas is recovered, and then the flue gas reacts with calcium hydroxide to absorb CO2, and the calcium carbonate precipitate is dried by the waste heat of the flue gas, and finally the calcium carbonate precipitate is reacted with dilute sulfuric acid to generate CO2, so as to achieve the purpose of high-purity recovery.

Description

Technical Field

[0001] The present invention relates to a CO 2 A recovery device and process, specifically a CO 2 The recovery device and process belong to the field of flue gas treatment technology. Background Art

[0002] Flue gas often contains a large amount of CO 2 , CO 2 Direct emissions will cause the greenhouse effect, so recycling them is economical and environmentally friendly, and has a great impact on CO 2 The recovery method is usually to absorb with alkaline solution, and then desorb the reactants to recover CO. 2 However, the flue gas contains sulfur dioxide, which will also react with the alkaline solution, eventually resulting in a decrease in the concentration of carbon dioxide after desorption. Therefore, desulfurization is required first. Currently, water washing is used for desulfurization. During water washing, CO 2 Dissolution will also occur, resulting in CO 2 The recycling efficiency is reduced, affecting the overall recycling benefits. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a CO 2 The recovery device and process can achieve efficient recovery of CO 2 At the same time, the CO in flue gas 2 High purity recovery.

[0004] To achieve the above purpose, the present invention adopts the following technical scheme: a CO 2 The recovery device comprises a desulfurization box and a recovery box, a connecting pipe is fixedly sleeved between the side walls of the desulfurization box and the recovery box, an air inlet is opened at the bottom of the outer wall of the desulfurization box, an exhaust fan is installed in the air inlet, a plurality of placement mesh plates are slidably clamped on the inner wall of the desulfurization box, a guide box is fixedly installed on the inner wall of the recovery box close to the connecting pipe, a plurality of nozzles are fixedly installed on the top of the guide box, a conveyor mesh belt is rotatably installed between the inner walls of the recovery box, a driving mechanism is installed between the conveyor mesh belt and the desulfurization box, a liquid supply mechanism is installed on the outer wall of the recovery box, the liquid supply mechanism connects the driving mechanism and the nozzle, a drying mechanism is installed between the conveyor mesh belt and the bottom of the recovery box, and an air outlet is opened at the end of the recovery box away from the connecting pipe.

[0005] As a further improvement of the present invention, an electric heating tube is installed at the bottom of the inner cavity of the desulfurization box, a filter is fixedly installed in the air inlet, the rotating shaft of the exhaust fan in the air inlet is connected to the driving mechanism through a transmission belt, calcium carbonate powder is evenly spread in the multiple placement mesh plates, and the outer wall of the desulfurization box is provided with an opening and closing door facing the placement mesh plates.

[0006] As a further improvement of the present invention, the driving mechanism includes a driving shaft, a driving shaft is rotatably provided through the bottom of the desulfurization box, a motor is fixedly installed on the outer wall of the desulfurization box, the output shaft of the motor is fixedly connected to one end of the driving shaft, the other end of the driving shaft is fixedly sleeved on a turntable, the rotating shaft of the exhaust fan is connected to the driving shaft through a transmission belt, one end of the conveyor belt is sleeved on the driving roller, roller shafts are fixedly installed at both ends of the driving roller, the roller shaft passes through the recovery box and is fixedly sleeved on a groove wheel, a plurality of stop grooves are opened on the outer wall of the groove wheel, a push groove is opened on the outer wall of the groove wheel between two adjacent stop grooves, a rotating groove is opened on the outer wall of the turntable, and a sliding shaft is installed on the end face of the turntable at the rotating groove through a connecting rod, and the sliding shaft matches the push groove.

[0007] As a further improvement of the present invention, the retaining groove is an arc-shaped structure that fits the outer wall of the circumference of the turntable, the diameter of the sliding shaft is equal to the width of the push groove, and the driving shaft is connected to the liquid supply mechanism through a transmission belt.

[0008] As a further improvement scheme of the present invention, the liquid supply mechanism includes a guide rail, the outer wall of the recovery box is fixedly installed with the guide rail, a sliding frame is slidably connected between the guide rails, and racks are fixedly installed on the inner walls of both sides of the sliding frame. A driven shaft is rotatably connected to the outer wall of the recovery box, and the driven shaft is connected to the driving shaft through a transmission belt. A half gear is fixedly sleeved on the driven shaft, and the half gear is located in the inner cavity of the sliding frame and engages with the rack. A sealing cylinder is fixedly installed on the outer wall of the recovery box, a piston is slidably connected in the sealing cylinder, a push rod is fixedly sleeved on the piston, the push rod passes through the sealing cylinder and is fixedly connected to the sliding frame, and a suction pipe and a discharge pipe are fixedly sleeved on both ends of the sealing cylinder, and the discharge pipe passes through the recovery box and is connected to the nozzle.

[0009] As a further improvement of the present invention, the suction pipe and the discharge pipe are both three-way pipes, and both ends of the suction pipe and the discharge pipe are respectively fixedly sleeved on the two ends of the sealing tube, the third end of the suction pipe extends into the externally arranged calcium hydroxide solution, the third end of the discharge pipe is connected to the nozzle, and the suction pipe and the discharge pipe are both equipped with a one-way valve at one end close to the sealing tube.

[0010] As a further improvement of the present invention, the drying mechanism includes a partition and a driven roller, the end of the conveyor mesh belt away from the roller shaft is sleeved on the driven roller, a partition is fixedly installed at the bottom of the recovery box at the driven roller, the driven roller is rotatably sleeved on the inner wall of the recovery box, the driven roller is a hollow cylindrical structure, the inner cavity of the driven roller is sleeved with a heat exchange tube, both ends of the heat exchange tube pass through the recovery box and are sleeved on the connecting pipe, a brush plate is fixedly installed on the inner wall of the recovery box, the bristles of the brush plate are tightly fitted to the outer wall of one end of the conveyor mesh belt close to the driven roller, and a collection box is slidably clamped at the bottom of the recovery box.

[0011] As a further improvement of the present invention, the heat exchange tube is a hollow tube filled with heat transfer oil, and an oil storage box is provided on the outer wall of the recovery box, and an oil pump connected to the heat exchange tube is installed in the oil storage box. The heat exchange tube is located in the inner cavity of the driven roller and on one side of the outer wall of the connecting tube, and both are spiral structures.

[0012] As a further improvement of the present invention, a collection pipe is fixedly sleeved on the bottom of the recovery box at one end of the partition close to the roller shaft, and a plurality of squeezing rollers are rotatably sleeved between the inner walls of the recovery box, and the squeezing rollers fit the top and bottom of the upward belt of the conveyor mesh belt.

[0013] A flue gas CO 2 The recycling process is as follows:

[0014] The air inlet is connected to the flue gas pipeline through a pipe, and calcium carbonate powder is placed on the mesh plate. The motor drives the driving shaft to rotate, and the exhaust fan rotates to draw the flue gas into the bottom of the inner cavity of the desulfurization box, and the smoke dust is filtered through the filter. The high-temperature gas of the flue gas is heated again by the electric heating tube set in the desulfurization box, so that when the flue gas flows through the calcium carbonate powder, it reacts to generate calcium sulfite and carbon dioxide, thereby achieving desulfurization. The generated carbon dioxide and the rest of the flue gas enter the recovery box through the connecting pipe;

[0015] The driving shaft drives the driven shaft to rotate through the transmission belt, and the driven shaft drives the half gear to rotate. The half gear alternately meshes with the racks on both sides of the sliding frame, thereby driving the sliding frame to move back and forth, and the sliding frame drives the push rod to move, so that the piston moves in the sealing cylinder. The sealing cylinder sucks the calcium hydroxide solution in the external storage barrel through the suction pipe, and then sends it into the nozzle through the discharge pipe. The nozzle sprays the calcium hydroxide solution evenly in the guide box, so that the flue gas flows into the recovery box and reacts with the calcium hydroxide solution to generate calcium carbonate precipitation, and flows to the conveyor mesh belt for filtration. The calcium carbonate precipitation is filtered on the conveyor mesh belt, and the residual calcium hydroxide solution flows out from the recovery pipe on the recovery box at the bottom of the conveyor mesh belt, and the rest of the flue gas flows out from the air outlet;

[0016] The driving shaft drives the turntable to rotate at the same time. During the rotation of the turntable, when the rotating groove faces the groove wheel, the sliding shaft slides into the push groove, thereby pushing the groove wheel to rotate. When the sliding shaft slides out of the push groove, the rotating groove moves away from the groove wheel, and the circumferential outer wall of the turntable is inserted into the stop groove to stop the groove wheel. The roller shaft realizes intermittent rotation, and the conveyor mesh belt rotates intermittently, so that the conveyor mesh belt can filter the accumulated calcium carbonate precipitation before moving;

[0017] When the flue gas flows through the connecting pipe, the heat transfer oil in the heat exchange tube absorbs heat and is driven by the oil pump to flow to the driven roller to heat the driven roller. When the conveyor mesh belt carries the calcium carbonate precipitate to the partition, the squeezing roller is driven by the conveyor mesh belt to passively rotate, thereby squeezing the filter cloth on the surface of the conveyor mesh belt to squeeze out the water, and then the precipitate moves to the driven roller. The intermittent movement allows the precipitate to stay at the driven roller for a period of time, so that the driven roller heats and dries the calcium carbonate precipitate. The dried precipitate moves to the brush plate and is brushed off to the collection box for collection, thereby collecting calcium carbonate.

[0018] Finally, the solids after the reaction in the desulfurization box and the calcium carbonate solids collected in the collection box are combined to form a mixture, and the mixture is reacted with dilute sulfuric acid to generate high-concentration CO 2 , to achieve CO in flue gas 2 of recycling.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] After the flue gas is filtered, it reacts with calcium carbonate to desulfurize, and then the waste heat of the flue gas is recovered. The flue gas reacts with calcium hydroxide to absorb CO 2 The calcium carbonate precipitate is dried by the waste heat of the flue gas, and finally the calcium carbonate precipitate is reacted with dilute sulfuric acid to generate CO 2 , to achieve the purpose of high-purity recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0023] Figure 3 For the present invention Figure 2 Enlarged structural diagram at A in the middle.

[0024] Figure 4 It is a schematic diagram of the back structure of the present invention.

[0025] Figure 5 For the present invention Figure 4 Enlarged structural diagram at B in the middle.

[0026] Figure 6 For the present invention Figure 4 Enlarged structural diagram at point C in the middle.

[0027] In the figure: 1. desulfurization box; 2. recovery box; 3. air inlet; 4. connecting pipe; 5. guide box; 6. nozzle; 7. liquid supply mechanism; 71. guide rail; 72. sliding frame; 73. driven shaft; 74. half gear; 75. rack; 76. sealing cylinder; 77. piston; 78. push rod; 79. suction pipe; 710. discharge pipe; 8. driving mechanism; 81. motor; 82. driving shaft; 83. roller shaft; 84. turntable; 85. groove wheel; 86. rotating groove; 87. stop groove; 88. push groove; 89. sliding shaft; 9. drying mechanism; 91. driven roller; 92. heat exchange tube; 93. brush plate; 94. collecting box; 95. partition; 10. conveyor mesh belt; 11. air outlet; 12. mesh plate placement; 13. extrusion roller. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is clearly and completely described below in conjunction with the embodiments and drawings.

[0029] like Figures 1 to 6 As shown, the present invention provides a method for treating CO in flue gas. 2 The recovery device comprises a desulfurization box 1 and a recovery box 2, a connecting pipe 4 is fixedly sleeved between the side walls of the desulfurization box 1 and the recovery box 2, an air inlet 3 is opened at the bottom of the outer wall of the desulfurization box 1, an exhaust fan is installed in the air inlet 3, a plurality of placement mesh plates 12 are slidably clamped on the inner wall of the desulfurization box 1, a guide box 5 is fixedly installed on the inner wall of the recovery box 2 near the connecting pipe 4, a plurality of nozzles 6 are fixedly installed on the top of the guide box 5, a conveying mesh belt 10 is rotatably installed between the inner walls of the recovery box 2, a driving mechanism 8 is installed between the conveying mesh belt 10 and the desulfurization box 1, a liquid supply mechanism 7 is installed on the outer wall of the recovery box 2, the liquid supply mechanism 7 connects the driving mechanism 8 and the nozzle 6, a drying mechanism 9 is installed between the conveying mesh belt 10 and the bottom of the recovery box 2, and an air outlet 11 is opened at the end of the recovery box 2 away from the connecting pipe 4.

[0030] Through the above technical scheme, the flue gas is filtered and then desulfurized by reacting with calcium carbonate, and then the waste heat of the flue gas is recovered, and then the flue gas reacts with calcium hydroxide to absorb CO 2 The calcium carbonate precipitate is dried by the waste heat of the flue gas, and finally the calcium carbonate precipitate is reacted with dilute sulfuric acid to generate CO 2 , to achieve the purpose of high-purity recovery.

[0031] Furthermore, an electric heating tube is installed at the bottom of the inner cavity of the desulfurization box 1, a filter is fixedly installed in the air inlet 3, the rotating shaft of the exhaust fan in the air inlet 3 is connected to the driving mechanism 8 through a transmission belt, calcium carbonate powder is evenly spread in multiple placement mesh plates 12, and the outer wall of the desulfurization box 1 is provided with an opening and closing door facing the placement mesh plates 12.

[0032] Furthermore, the driving mechanism 8 includes a driving shaft 82, which is rotatably provided through the bottom of the desulfurization box 1, and a motor 81 is fixedly installed on the outer wall of the desulfurization box 1. The output shaft of the motor 81 is fixedly connected to one end of the driving shaft 82, and the other end of the driving shaft 82 is fixedly sleeved on a turntable 84. The rotating shaft of the exhaust fan is connected to the driving shaft 82 through a transmission belt, and one end of the conveyor mesh belt 10 is sleeved on the driving roller. Rollers 83 are fixedly installed at both ends of the driving roller. The rollers 83 pass through the recovery box 2 and are fixedly sleeved on a groove wheel 85. A plurality of stop grooves 87 are provided on the outer wall of the groove wheel 85, and a push groove 88 is provided on the outer wall of the groove wheel 85 between two adjacent stop grooves 87. A rotating groove 86 is provided on the outer wall of the turntable 84, and a sliding shaft 89 is installed on the end face of the turntable 84 at the rotating groove 86 through a connecting rod, and the sliding shaft 89 matches the push groove 88.

[0033] Furthermore, the stop groove 87 is an arc-shaped structure that fits the outer circumferential wall of the rotating disk 84, the diameter of the sliding shaft 89 is equal to the width of the pushing groove 88, and the driving shaft 82 is connected to the liquid supply mechanism 7 through a transmission belt.

[0034] Furthermore, the liquid supply mechanism 7 includes a guide rail 71, the outer wall of the recovery box 2 is fixedly installed with the guide rail 71, a sliding frame 72 is slidably connected between the guide rails 71, and racks 75 are fixedly installed on the inner walls of both sides of the sliding frame 72. A driven shaft 73 is rotatably connected to the outer wall of the recovery box 2, and the driven shaft 73 is connected to the driving shaft 82 through a transmission belt. A half gear 74 is fixedly sleeved on the driven shaft 73, and the half gear 74 is located in the inner cavity of the sliding frame 72 and engages with the rack 75. A sealing cylinder 76 is fixedly installed on the outer wall of the recovery box 2, and a piston 77 is slidably connected in the sealing cylinder 76. A push rod 78 is fixedly sleeved on the piston 77, and the push rod 78 passes through the sealing cylinder 76 and is fixedly connected to the sliding frame 72. A suction pipe 79 and a discharge pipe 710 are fixedly sleeved at both ends of the sealing cylinder 76, and the discharge pipe 710 passes through the recovery box 2 and is connected to the nozzle 6.

[0035] Furthermore, both the suction pipe 79 and the discharge pipe 710 are three-way pipes, and both ends of the suction pipe 79 and the discharge pipe 710 are respectively fixedly sleeved on the two ends of the sealing tube 76, the third end of the suction pipe 79 extends into the externally arranged calcium hydroxide solution, and the third end of the discharge pipe 710 is connected to the nozzle 6, and the suction pipe 79 and the discharge pipe 710 are both installed with a one-way valve at one end close to the sealing tube 76.

[0036] Furthermore, the drying mechanism 9 includes a partition 95 and a driven roller 91, and one end of the conveyor mesh belt 10 away from the roller shaft 83 is sleeved on the driven roller 91. The partition 95 is fixedly installed on the bottom of the recovery box 2 at the driven roller 91, and the driven roller 91 is rotatably sleeved on the inner wall of the recovery box 2. The driven roller 91 is a hollow cylindrical structure, and the inner cavity of the driven roller 91 is sleeved with a heat exchange tube 92. Both ends of the heat exchange tube 92 pass through the recovery box 2 and are sleeved on the connecting pipe 4. A brush plate 93 is fixedly installed on the inner wall of the recovery box 2. The bristles of the brush plate 93 are tightly attached to the outer wall of one end of the conveyor mesh belt 10 close to the driven roller 91, and a collection box 94 is slidably clamped on the bottom of the recovery box 2.

[0037] Furthermore, the heat exchange tube 92 is a hollow tube filled with heat transfer oil, and an oil storage box is provided on the outer wall of the recovery box 2, and an oil pump connected to the heat exchange tube 92 is installed in the oil storage box. The heat exchange tube 92 is located in the inner cavity of the driven roller 91 and on one side of the outer wall of the connecting tube 4, and both are spiral structures.

[0038] Furthermore, a collecting pipe is fixedly sleeved on the bottom of the recovery box 2 at one end of the partition 95 close to the roller shaft 83, and a plurality of squeezing rollers 13 are rotatably sleeved between the inner walls of the recovery box 2, and the squeezing rollers 13 fit the top and bottom of the upward belt of the conveyor mesh belt 10.

[0039] Utilize CO in flue gas 2 The recovery device for CO in flue gas 2 The recycling process is as follows:

[0040] The air inlet 3 is connected to the flue gas pipeline through a pipe, and calcium carbonate powder is placed on the mesh plate 12. The motor 81 drives the driving shaft 82 to rotate, so that the exhaust fan rotates to draw the flue gas into the bottom of the inner cavity of the desulfurization box 1, and the smoke dust is filtered through the filter. The flue gas itself is a high-temperature gas, which is heated again by the electric heating tube set in the desulfurization box 1, so that the flue gas reacts when it flows through the calcium carbonate powder to generate calcium sulfite and carbon dioxide, thereby achieving the purpose of desulfurization, and the generated carbon dioxide and the remaining flue gas enter the recovery box 2 through the connecting pipe 4;

[0041] When the motor 81 drives the driving shaft 82 to rotate, the driving shaft 82 drives the driven shaft 73 to rotate through the transmission belt, and the driven shaft 73 drives the half gear 74 to rotate. The half gear 74 alternately meshes with the racks 75 on both sides of the sliding frame 72, thereby driving the sliding frame 72 to move back and forth, and the sliding frame 72 drives the push rod 78 to move, so that the piston 77 moves in the sealing cylinder 76. In this way, the sealing cylinder 76 sucks the calcium hydroxide solution in the external storage barrel through the suction pipe 79, and then sends it into the nozzle 6 through the discharge pipe 710. The nozzle 6 evenly sprays the calcium hydroxide solution into the guide box 5, so that the smoke flows into the recovery box 2 and reacts with the calcium hydroxide solution to generate calcium carbonate precipitation, and flows to the conveyor mesh belt 10 for filtration. The calcium carbonate precipitation is filtered on the conveyor mesh belt 10, and the residual calcium hydroxide solution flows out from the recovery pipe on the recovery box 2 at the bottom of the conveyor mesh belt 10, and the remaining smoke flows out from the air outlet 11;

[0042] The driving shaft 82 simultaneously drives the rotating disk 84 to rotate. When the rotating disk 84 rotates, the rotating groove 86 faces the groove wheel 85. At this time, the sliding shaft 89 slides into the pushing groove 88, thereby pushing the groove wheel 85 to rotate. When the sliding shaft 89 slides out of the pushing groove 88, the rotating groove 86 is away from the groove wheel 85. The circumferential outer wall of the rotating disk 84 is stuck in the stopping groove 87 to stop the groove wheel 85. In this way, the roller shaft 83 realizes intermittent rotation, and the conveyor mesh belt 10 performs intermittent rotation, so that the conveyor mesh belt 10 can filter and accumulate a part of calcium carbonate precipitation before moving;

[0043] When the flue gas flows through the connecting pipe 4, it is in a high-temperature state. At this time, the heat transfer oil in the heat exchange tube 92 absorbs heat and drives the heat transfer oil to flow through the oil pump, thereby transferring the waste heat of the flue gas to the driven roller 91. When the conveyor mesh belt 10 carries the calcium carbonate precipitate and moves to the partition 95, the squeezing roller 13 is driven by the conveyor mesh belt 10 to passively rotate, thereby squeezing the filter cloth on the surface of the conveyor mesh belt 10 to squeeze out the water, and then the precipitate moves to the driven roller 91. Also due to the intermittent movement, the precipitate stays at the driven roller 91 for a period of time. The heat transfer oil in the heat exchange tube 92 heats the driven roller 91 with the heat absorbed by the waste heat of the flue gas, and the driven roller 91 heats and dries the calcium carbonate precipitate. The dried precipitate moves to the brush plate 93 and is brushed to the collection box 94 for collection, realizing CO 2 For the purpose of conversion into calcium carbonate and collection;

[0044] Finally, the solids after the reaction in the desulfurization box 1 and the calcium carbonate solids collected in the collection box 94 are combined to form a mixture, and the mixture is reacted with dilute sulfuric acid to finally generate high-concentration CO 2 Complete recycling.

Claims

1. A device for recovering CO2 in flue gas, comprising a desulfurization box (1) and a recovery box (2), characterized in that: A connecting pipe (4) is fixedly sleeved between the side walls of the desulfurization box (1) and the recovery box (2); an electric heating pipe is installed at the bottom of the inner cavity of the desulfurization box (1); an air inlet (3) is opened at the bottom of the outer wall of the desulfurization box (1); an exhaust fan is installed in the air inlet (3); a plurality of placement mesh plates (12) are slidably clamped on the inner wall of the desulfurization box (1); calcium carbonate powder is evenly laid in the plurality of placement mesh plates (12); a guide box (5) is fixedly installed on the inner wall of the recovery box (2) near the connecting pipe (4); a plurality of nozzles (6) are fixedly installed on the top of the guide box (5); a conveying mesh belt (10) is rotatably installed between the inner walls of the recovery box (2); A plurality of squeezing rollers (13) are rotatably sleeved between the inner walls of the recovery box (2), the squeezing rollers (13) are in contact with the top and bottom of the upper belt of the conveyor mesh belt (10), a driving mechanism (8) is installed between the conveyor mesh belt (10) and the desulfurization box (1), the rotating shaft of the exhaust fan in the air inlet (3) is connected to the driving mechanism (8) through a transmission belt, a liquid supply mechanism (7) is installed on the outer wall of the recovery box (2), the liquid supply mechanism (7) is connected to the driving mechanism (8) and the nozzle (6), a drying mechanism (9) is installed between the conveyor mesh belt (10) and the bottom of the recovery box (2), and an air outlet (11) is opened at one end of the recovery box (2) away from the connecting pipe (4); The driving mechanism (8) comprises a driving shaft (82), the driving shaft (82) is rotatably provided at the bottom of the desulfurization box (1), a motor (81) is fixedly mounted on the outer wall of the desulfurization box (1), the output shaft of the motor (81) is fixedly connected to one end of the driving shaft (82), the other end of the driving shaft (82) is fixedly sleeved on a turntable (84), the rotating shaft of the exhaust fan is connected to the driving shaft (82) via a transmission belt, the driving shaft (82) is connected to a liquid supply mechanism (7) via a transmission belt, one end of the conveying mesh belt (10) is sleeved on a driving roller, and roller shafts (83) are fixedly mounted on both ends of the driving roller. The roller shaft (83) passes through the recovery box (2) and is fixedly sleeved on the groove wheel (85); the outer wall of the groove wheel (85) is provided with a plurality of stop grooves (87); the stop grooves (87) are arc-shaped structures that fit the outer wall of the circumference of the rotating disk (84); the outer wall of the groove wheel (85) between two adjacent stop grooves (87) is provided with a push groove (88); the outer wall of the rotating disk (84) is provided with a rotating groove (86); the end surface of the rotating disk (84) at the rotating groove (86) is provided with a sliding shaft (89) through a connecting rod; the sliding shaft (89) matches the push groove (88); and the diameter of the sliding shaft (89) is equal to the width of the push groove (88); The liquid supply mechanism (7) comprises a guide rail (71), the outer wall of the recovery box (2) is fixedly mounted with the guide rail (71), a sliding frame (72) is slidably engaged between the guide rails (71), racks (75) are fixedly mounted on the inner walls of both sides of the sliding frame (72), a driven shaft (73) is rotatably engaged with the outer wall of the recovery box (2), the driven shaft (73) is connected to the driving shaft (82) through a transmission belt, a half gear (74) is fixedly sleeved on the driven shaft (73), the half gear (74) is located in the inner cavity of the sliding frame (72) and meshes with the rack (75), a sealing cylinder (76) is fixedly mounted on the outer wall of the recovery box (2), a piston (77) is slidably engaged in the sealing cylinder (76), and a fixed sleeve is mounted on the piston (77). A push rod (78) is connected, the push rod (78) passes through the sealing cylinder (76) and is fixedly connected to the sliding frame (72), the two ends of the sealing cylinder (76) are fixedly sleeved with a suction pipe (79) and a discharge pipe (710), the discharge pipe (710) passes through the recovery box (2) and is connected to the nozzle (6), the suction pipe (79) and the discharge pipe (710) are both three-way pipes, and the two ends of the suction pipe (79) and the discharge pipe (710) are respectively fixedly sleeved with the two ends of the sealing cylinder (76), the third end of the suction pipe (79) extends into the calcium hydroxide solution arranged outside, the third end of the discharge pipe (710) is connected to the nozzle (6), and one end of the suction pipe (79) and the discharge pipe (710) close to the sealing cylinder (76) is installed with a one-way valve; The drying mechanism (9) comprises a partition (95) and a driven roller (91); one end of the conveying mesh belt (10) away from the roller shaft (83) is sleeved on the driven roller (91); a partition (95) is fixedly installed on the bottom of the recovery box (2) at the driven roller (91); a recovery pipe is fixedly sleeved on the bottom of the recovery box (2) at one end of the partition (95) close to the roller shaft (83); the driven roller (91) is rotatably sleeved on the inner wall of the recovery box (2); the driven roller (91) is a hollow cylindrical structure; the inner cavity of the driven roller (91) is sleeved with A heat exchange tube (92), wherein the heat exchange tube (92) is a hollow tube filled with heat transfer oil, and an oil storage box is provided on the outer wall of the recovery box (2), and an oil pump connected to the heat exchange tube (92) is installed in the oil storage box, and both ends of the heat exchange tube (92) pass through the recovery box (2) and are sleeved on the connecting pipe (4), and a brush plate (93) is fixedly installed on the inner wall of the recovery box (2), and the bristles of the brush plate (93) are tightly attached to the outer wall of one end of the conveyor mesh belt (10) close to the driven roller (91), and a collection box (94) is slidably connected to the bottom of the recovery box (2).

2. The device for recovering CO2 from flue gas according to claim 1, characterized in that: A filter screen is fixedly installed in the air inlet (3), and an outer wall of the desulfurization box (1) is provided with an opening and closing door facing the screen plate (12).

3. The device for recovering CO2 from flue gas according to claim 1, characterized in that: The heat exchange tube (92) located on one side of the inner cavity of the driven roller (91) and the outer wall of the connecting tube (4) is a spiral structure.

4. A process for recovering CO2 in flue gas based on the device for recovering CO2 in flue gas as claimed in claim 1, characterized in that: The details are as follows: The air inlet (3) is connected to the flue gas pipeline through a pipe, and calcium carbonate powder is placed on the mesh plate (12). The motor (81) drives the driving shaft (82) to rotate, and the exhaust fan rotates to draw the flue gas into the bottom of the inner cavity of the desulfurization box (1), and the smoke dust is filtered through the filter screen. The high-temperature gas of the flue gas is heated again by the electric heating tube arranged in the desulfurization box (1), so that when the flue gas flows through the calcium carbonate powder, it reacts to generate calcium sulfite and carbon dioxide, thereby achieving desulfurization. The generated carbon dioxide and the remaining flue gas enter the recovery box (2) through the connecting pipe (4); The driving shaft (82) drives the driven shaft (73) to rotate through the transmission belt, and the driven shaft (73) drives the half gear (74) to rotate. The half gear (74) alternately meshes with the racks (75) on both sides of the sliding frame (72), thereby driving the sliding frame (72) to move back and forth. The sliding frame (72) drives the push rod (78) to move, thereby causing the piston (77) to move in the sealing cylinder (76). The sealing cylinder (76) sucks the calcium hydroxide solution in the external storage barrel through the suction pipe (79). , and then sent into the nozzle (6) through the discharge pipe (710), the nozzle (6) uniformly sprays the calcium hydroxide solution into the guide box (5), so that the smoke flows into the recovery box (2) and reacts with the calcium hydroxide solution to generate calcium carbonate precipitate, and flows to the conveyor mesh belt (10) for filtration. The calcium carbonate precipitate is filtered on the conveyor mesh belt (10), and the residual calcium hydroxide solution flows out from the recovery pipe on the recovery box (2) at the bottom of the conveyor mesh belt (10), and the remaining smoke flows out from the gas outlet (11); The driving shaft (82) simultaneously drives the rotating disk (84) to rotate. During the rotation of the rotating disk (84), when the rotating groove (86) faces the groove wheel (85), the sliding shaft (89) slides into the pushing groove (88), thereby pushing the groove wheel (85) to rotate. When the sliding shaft (89) slides out of the pushing groove (88), the rotating groove (86) moves away from the groove wheel (85), and the circumferential outer wall of the rotating disk (84) is inserted into the stopping groove (87), so that the groove wheel (85) is stopped. The roller shaft (83) realizes intermittent rotation, and the conveying mesh belt (10) performs intermittent rotation, so that the conveying mesh belt (10) can filter the accumulated calcium carbonate precipitation and then move. When the flue gas flows through the connecting pipe (4), the heat transfer oil in the heat exchange pipe (92) absorbs heat and is driven by the oil pump to flow to the driven roller (91) to heat the driven roller (91). When the conveying mesh belt (10) carries the calcium carbonate precipitate and moves to the partition (95), the squeezing roller (13) is driven by the conveying mesh belt (10) to passively rotate, thereby squeezing the filter cloth on the surface of the conveying mesh belt (10) to squeeze out the water, and then the precipitate moves to the driven roller (91). The intermittent movement allows the precipitate to stay at the driven roller (91) for a period of time, so that the driven roller (91) heats and dries the calcium carbonate precipitate. The dried precipitate moves to the brush plate (93) and is brushed off to the collection box (94) for collection, thereby collecting the calcium carbonate. Finally, the solids after the reaction in the desulfurization box (1) and the calcium carbonate solids collected in the collection box (94) are combined to form a mixture, and the mixture is reacted with dilute sulfuric acid to generate high-concentration CO2, thereby realizing the recovery of CO2 in the flue gas.

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