A desulfurization and denitrification environmentally friendly flue gas treatment system and treatment method

Abstract

The present invention relates to the field of flue gas treatment technology, specifically to a desulfurization and denitrification environmentally friendly flue gas treatment system and treatment method, comprising a treatment tower composed of a plurality of treatment units stacked and connected in sequence, wherein the treatment unit comprises a mounting cylinder and a mounting rod movably mounted in the upper treatment unit, wherein the mounting rod extends into the slurry pool of the mounting cylinder and is movably provided with a fan-shaped filter plate, and the fan-shaped filter plate is assembled for the following two states: in the first state, the fan-shaped filter plate is in a vertical state and rotates with the mounting rod to stir the slurry. The desulfurization and denitrification environmentally friendly flue gas treatment system and treatment method provided by the invention stirs the slurry through the fan-shaped filter plate in the first state, so that the exhaust gas and the slurry are fully in contact, and forms a pressure plate through the filter plate in the second state, and the pressure plate cooperates with the slurry pool to filter the slurry to filter the particulate matter in the slurry. It is only necessary to discharge the high-concentration liquid after the filter pressure, and the amount of wastewater generated is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas treatment, and in particular to a desulfurization and denitrification environmentally friendly flue gas treatment system and treatment method. Background Art

[0002] Flue gas treatment system is an essential equipment for many factories, especially those factories whose waste gas contains nitrate and sulfur. The nitrate in the waste gas will destroy the ozone layer, and the nitrogen oxides produced will have an impact on the environment and human health, especially irritating the respiratory system. The sulfur in the waste gas will also endanger human health. Therefore, the waste gas needs to be desulfurized and denitrified before it is discharged, and can only be discharged after meeting national standards.

[0003] According to the publication (announcement) number CN107754586B, the publication (announcement) date is 2024-01-19, and the disclosed desulfurization and denitrification device for flue gas treatment includes a cylinder and a spray layer assembly, a demisting device and an exhaust fan arranged in the cylinder from bottom to top, the lower end side wall of the cylinder is provided with a flue gas inlet, and the upper end is provided with an air outlet located at the rear side of the exhaust fan; the spray layer assembly includes multiple groups of spray components arranged horizontally in parallel, the spray component includes a spray pipe, a rotating sleeve, a vertical partition and a driving device, the spray pipe is arranged horizontally and a plurality of spray nozzles are distributed axially on its side wall, the rotating sleeve is outermost of the spray pipe and is driven to rotate by the driving device, the side wall of the rotating sleeve is distributed with a plurality of through holes for the passage of flue gas and spray liquid, and the vertical partition is arranged between adjacent rotating sleeves to block and collect the spray liquid thrown out by the rotating sleeve.

[0004] In the prior art including the above-mentioned patents, when flue gas is desulfurized, limestone slurry is generally used to react with sulfur in the exhaust gas to generate calcium sulfate. Calcium sulfate is slightly soluble in water and is easily precipitated from the limestone slurry. Limestone slurry is a suspension. When filtering calcium sulfate, the calcium carbonate suspended in the limestone slurry is also easily filtered away. Therefore, most of the time, the limestone slurry is replaced as a whole after working for a period of time. However, this method will generate a large amount of wastewater, which places high demands on the factory's sewage purification system. Summary of the Invention

[0005] The purpose of the present invention is to provide a desulfurization and denitrification environmentally friendly flue gas treatment system and treatment method, aiming to solve the above problems.

[0006] To achieve the above objectives, the present invention provides an environmentally friendly flue gas treatment system for desulfurization and denitrification, comprising a treatment tower composed of a plurality of treatment units stacked and connected in sequence, wherein the treatment unit comprises a mounting cylinder and a mounting rod movably mounted in the upper treatment unit, the mounting rod extending into the slurry pool of the mounting cylinder and movably provided with a fan-shaped filter plate, the fan-shaped filter plate being assembled for the following two states:

[0007] In the first state, the fan-shaped filter plate is in a vertical state and rotates with the mounting rod to stir the slurry;

[0008] In the second state, the plurality of sector filter plates are on the same plane and form a pressure plate, and the pressure plate moves downward along with the mounting rod to cooperate with the slurry pool to filter the slurry.

[0009] Preferably, the sector filter plate moves away from the mounting rod under the action of centrifugal force so as to switch from the second state to the first state.

[0010] Preferably, the slurry pool includes a vertically distributed stirring chamber and an extrusion chamber, the diameter of the stirring chamber is larger than that of the extrusion chamber and is adapted to the fan-shaped filter plate in the first state.

[0011] Preferably, a plurality of movable plates are movably provided on the side wall of the stirring chamber, and the plurality of movable plates are brought together to form a limiting cylinder adapted to the pressure plate.

[0012] Preferably, a third flow channel and a fourth flow channel for limestone powder and water to enter the stirring chamber are symmetrically provided on the mounting cylinder, and a plurality of sealing sheets adapted to the pressure plate are provided on the mounting cylinder.

[0013] Preferably, a first flow channel for exhaust gas to enter the extrusion chamber is opened on the mounting cylinder, and the fan-shaped filter plate switches from the first state to the second state to close the first flow channel.

[0014] Preferably, a guide ring is movably provided on the mounting cylinder for guiding the mounting rod thereon to reciprocate up and down, and the sector filter plate switches from the first state to the second state to move the guide ring downward.

[0015] Preferably, the mounting cylinder is provided with a guide block for supporting the bottom sealing plate of the extrusion chamber, and the guide block is symmetrically provided with slopes for guiding the flow of liquid.

[0016] Preferably, a slider is provided in the extrusion chamber, and the pressure plate presses the slider to open the bottom of the extrusion chamber.

[0017] A desulfurization and denitrification environmentally friendly flue gas treatment method, which is based on the desulfurization and denitrification environmentally friendly flue gas treatment system in the above scheme, further comprising the following steps:

[0018] S1. The exhaust gas is sent into the slurry pool through the first flow channel. The sulfur in the exhaust gas reacts with the limestone slurry to form calcium sulfate. The mounting rod drives the fan-shaped filter plate in the first state to rotate, breaking up the bubbles so that the exhaust gas and the slurry are fully in contact.

[0019] S2. After working for a period of time, the rotation speed of the mounting rod is reduced to switch the sector filter plate from the first state to the second state, and the guide ring guides the mounting rod to move downward, so that the pressure plate cooperates with the extrusion cavity to filter the liquid in the slurry pool;

[0020] S3, the bottom of the extrusion chamber is opened to discharge the high-concentration liquid, and the pressure plate moves up, and the extrusion chamber is reopened;

[0021] S4. The pressure plate cooperates with the sealing sheet to seal the slurry pool and add limestone powder and water into it. The fan-shaped filter plate switches from the second state to the first state, and the liquid is stirred to re-form limestone slurry.

[0022] In the above technical scheme, the present invention provides a desulfurization and denitrification environmentally friendly flue gas treatment system and treatment method, which has the following beneficial effects: when performing rough desulfurization treatment of exhaust gas, the exhaust gas is passed into the slurry pool of the lowest treatment unit, and the sulfur in the exhaust gas reacts with the calcium carbonate in the slurry to generate calcium sulfate or calcium sulfite. The calcium sulfite is oxidized to generate calcium sulfate, and calcium sulfate is slightly soluble in water and easily precipitated from the slurry. At this time, the fan-shaped plate is in the first state, and the mounting rod drives the fan-shaped filter plate to rotate through the mounting block. The fan-shaped filter plate stirs the slurry to disperse the exhaust gas passed into the slurry so that the exhaust gas is fully in contact with the slurry, thereby facilitating the reaction of calcium carbonate in the slurry with sulfur in the exhaust gas; after working for a period of time, most of the calcium carbonate in the slurry reacts with the sulfur in the exhaust gas to generate calcium sulfate, and the ability of the slurry to purify the exhaust gas is weakened. At this time, the fan-shaped filter plate switches from the first state to the second state, and multiple fan-shaped filter plates form a pressure plate. The mounting rod drives the mounting block and the pressure plate to move downward, and the pressure plate cooperates with the slurry pool to squeeze the slurry. , the slurry is filtered to filter out the water in the slurry, and the particles and part of the water remain between the bottom of the pressure plate and the bottom of the slurry pool. The particulate content of this part of the liquid is very large. At this time, the bottom of the slurry pool is opened, and the high-concentration liquid at the bottom of the slurry pool is discharged and discharged through the second flow channel under the guidance of the guide block. Then the bottom of the slurry pool is closed, the pressure plate moves up and switches to the first state, and then an appropriate amount of limestone powder and water are added to the slurry pool. The mounting rod drives the fan-shaped filter plate to rotate, and the fan-shaped filter plate stirs the liquid in the slurry pool so that the water and limestone powder are mixed to form limestone slurry. In the process of rotation, the fan-shaped filter plate can clean its own filter pores to avoid some particles remaining in the filter pores during filtration and clogging the fan-shaped filter plate; the slurry is stirred by the fan-shaped filter plate in the first state, so that the exhaust gas is fully in contact with the slurry, and the filter plate in the second state forms a pressure plate. The pressure plate cooperates with the slurry pool to filter the slurry and filter the particles in the slurry. It is only necessary to discharge the high-concentration liquid after filtration, and the amount of wastewater generated is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the internal structure provided by an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the internal structure of a guide block provided by an embodiment of the present invention;

[0027] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 A schematic diagram of the internal structure of the installation cylinder provided in an embodiment of the present invention;

[0029] Figure 6 A schematic structural diagram of a first flow channel provided in an embodiment of the present invention;

[0030] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0031] Figure 8 for Figure 6 Enlarged view of point C in the middle;

[0032] Figure 9 A schematic diagram of an explosion structure provided by an embodiment of the present invention;

[0033] Figure 10 for Figure 9 Enlarged view of point D in the middle;

[0034] Figure 11 A schematic structural diagram of a fan-shaped filter plate in a first state provided by an embodiment of the present invention;

[0035] Figure 12 This is a structural diagram of the movable panel in the folded state provided by an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 1. Processing unit; 11. Mounting cylinder; 111. Stirring chamber; 112. Extrusion chamber; 113. Movable plate; 114. Connecting block; 115. Tenon; 116. Dial ring; 117. Arc groove; 118. Closing plate; 119. Guide block; 12. Mounting rod; 121. Mounting block; 122. Sector filter plate; 123. Threaded block; 124. Gear ring; 125. Sealing disc; 126. Pressure plate; 127. Pull rod; 128 , guide chamber; 129, connecting rod; 131, first flow channel; 132, second flow channel; 133, third flow channel; 134, fourth flow channel; 135, pressure relief flow channel; 136, limiting cylinder; 141, push ring; 142, first paddle; 143, first cable; 144, second paddle; 145, second cable; 146, baffle; 147, slider; 148, third cable; 149, guide ring; 2, treatment tower. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0039] like Figure 1-12 As shown, a desulfurization and denitrification environmentally friendly flue gas treatment system and treatment method includes a treatment tower 2 composed of multiple treatment units 1 stacked and connected in sequence. The treatment unit 1 includes a mounting cylinder 11 and a mounting rod 12 movably mounted in the upper treatment unit 1. The mounting rod 12 extends into the slurry pool of the mounting cylinder 11 and is movably provided with a fan-shaped filter plate 122. The fan-shaped filter plate 122 is assembled for the following two states:

[0040] In the first state, the fan-shaped filter plate 122 is in a vertical state and rotates with the mounting rod 12 to stir the slurry;

[0041] In the second state, the plurality of sector filter plates 122 are on the same plane and form a pressure plate 126 , which moves downward along with the mounting rod 12 to cooperate with the slurry pool to filter the slurry.

[0042] Specifically, multiple processing units 1 are connected in sequence, a mounting block 121 is provided at the bottom of the mounting rod 12, and multiple fan-shaped filter plates 122 are movably mounted on the mounting block 121. The bottom of the slurry pool can be opened, and a guide block 119 is provided at the bottom of the mounting cylinder 11, which is located below the slurry pool. The guide block 119 is symmetrically provided with slopes for guiding the flow of liquid. A second flow channel 132 is symmetrically provided at the bottom of the mounting cylinder 11. The end of the mounting rod 12 of any processing unit 1 is movably mounted in the guide block 119 of the upper processing unit 1. A cover plate is provided on the top of the uppermost processing unit 1, and the mounting rod 12 of the processing unit 1 is movably mounted on the cover plate, which is provided with an exhaust pipe.

[0043] In the above technical solution, when the exhaust gas desulfurization rough treatment is carried out, the exhaust gas is passed into the slurry pool of the lowest treatment unit 1, and the sulfur in the exhaust gas reacts with the calcium carbonate in the slurry to generate calcium sulfate or calcium sulfite, and the calcium sulfite is oxidized to generate calcium sulfate, and calcium sulfate is slightly soluble in water and easily precipitated from the slurry. At this time, the fan-shaped plate is in the first state, and the mounting rod 12 drives the fan-shaped filter plate 122 to rotate through the mounting block 121. The fan-shaped filter plate 122 stirs the slurry to disperse the exhaust gas passed into the slurry so that the exhaust gas and the slurry can be separated. Full contact makes it easier for calcium carbonate in the slurry to react with sulfur in the exhaust gas; after working for a period of time, most of the calcium carbonate in the slurry reacts with sulfur in the exhaust gas to generate calcium sulfate, and the ability of the slurry to purify the exhaust gas is weakened. At this time, the fan-shaped filter plate 122 switches from the first state to the second state, and multiple fan-shaped filter plates 122 form a pressure plate 126. The mounting rod 12 drives the mounting block 121 and the pressure plate 126 to move downward. The pressure plate 126 cooperates with the slurry pool to squeeze the slurry, filter the slurry, and filter out the water in the slurry. , particles and part of the water remain between the bottom of the pressure plate 126 and the bottom of the slurry pool. The particulate matter content of this part of the liquid is very large. At this time, the bottom of the slurry pool is opened, and the high-concentration liquid at the bottom of the slurry pool is discharged and discharged through the second flow channel 132 under the guidance of the guide block 119. Then the bottom of the slurry pool is closed, the pressure plate 126 moves up and switches to the first state, and then an appropriate amount of limestone powder and water are added to the slurry pool. The mounting rod 12 drives the fan-shaped filter plate 122 to rotate, and the fan-shaped filter plate 122 stirs the liquid in the slurry pool, so that Water and limestone powder are mixed to form limestone slurry, and the fan-shaped filter plate 122 can clean its own filter holes during rotation to avoid some particles remaining in the filter holes during filtration and clogging the fan-shaped filter plate 122; the slurry is stirred by the fan-shaped filter plate 122 in the first state to make the exhaust gas fully contact with the slurry, and the filter plate in the second state forms a pressure plate 126, which cooperates with the slurry pool to filter the slurry and filter the particulate matter in the slurry. It only needs to discharge the high-concentration liquid after filtration, and the amount of wastewater generated is greatly reduced.

[0044] As a further embodiment provided by the present invention, the sector-shaped filter plate 122 moves away from the mounting rod 12 under the action of centrifugal force so as to switch from the second state to the first state.

[0045] Specifically, a guide cavity 128 is provided on the mounting block 121, and threads are provided on part of the inner wall of the guide cavity 128. A threaded block 123 extending into the guide cavity 128 is provided on the fan-shaped filter plate 122. A pull rod 127 is provided for rotation inside the mounting block 121, and the other end of the pull rod 127 is fixedly installed on the threaded block 123. The pull rod 127 is specifically a self-elastic telescopic rod.

[0046] Furthermore, in the process of the mounting rod 12 driving the mounting block 121 to rotate and move downward, the sector filter plate 122 moves in the direction away from the mounting block 121 under the action of centrifugal force, and the threaded block 123 moves along the guide cavity 128 and gradually contacts the threads on the inner wall of the guide cavity 128 until the distance between the sector filter plates 122 is sufficient for the sector filter plate 122 to rotate. The sector filter plate 122 continues to move under the action of centrifugal force, and the threaded block 123 moves along the threads in the guide cavity 128 to drive the sector filter plate 122 to rotate, causing the sector filter plate 122 to tilt, and the bottom end of the sector filter plate 122 gradually contacts the slurry, which hinders the sector filter plate 122 and causes the sector filter plate 122 to continue to rotate until the sector filter plate 122 becomes In the horizontal state, the fan-shaped filter plate 122 cannot continue to rotate, but rotates with the mounting rod 12 to stir the slurry in the slurry pool. At the same time, the pull rod 127 between the threaded block 123 and the mounting block 121 is stretched, and the pull rod 127 accumulates elastic potential energy; when the fan-shaped filter plate 122 needs to be switched from the first state to the second state, the mounting rod 12 stops rotating, the pull rod 127 releases the elastic potential energy and drives the fan-shaped filter plate 122 to move closer to the mounting block 121, and the threaded block 123 rotates in the opposite direction along the thread on the inner wall of the guide cavity 128 until the fan-shaped filter plate 122 becomes nearly horizontal and continues to approach the mounting block 121. Multiple fan-shaped filter plates 122 press against each other and become horizontal, and multiple fan-shaped filter plates 122 form a pressure plate 126.

[0047] As another embodiment further provided by the present invention, the slurry pool includes a vertically distributed stirring chamber 111 and an extrusion chamber 112. The diameter of the stirring chamber 111 is larger than that of the extrusion chamber 112 and is adapted to the fan-shaped filter plate 122 in the first state.

[0048] Specifically, when stirring, the fan-shaped filter plate 122 moves a distance away from the mounting block 121, so that the fan-shaped filter plate 122 in the first state requires a larger space when rotating. At this time, most of the fan-shaped filter plate 122 can only move in the stirring chamber 111 with a larger diameter, and the bottom end of the fan-shaped filter plate 122 can be inserted into the extrusion chamber 112 and stir the slurry in the extrusion chamber 112, so that the slurry in the extrusion chamber 112 moves together with the slurry in the stirring chamber 111, thereby strengthening the contact between the exhaust gas and the slurry.

[0049] As another embodiment further provided by the present invention, a plurality of movable plates 113 are movably provided on the side wall of the stirring chamber 111 , and the plurality of movable plates 113 are brought together to form a limiting cylinder 136 adapted to the pressure plate 126 .

[0050] Specifically, a shift ring 116 is provided for rotation inside the mounting cylinder 11, a connecting block 114 extending into the mounting cylinder 11 is provided on the movable plate 113, a groove adapted to the connecting block 114 is provided on the mounting cylinder 11, a tenon 115 is provided on the connecting block 114, and an arc groove 117 corresponding one-to-one to the movable plate 113 and adapted to the tenon 115 is provided on the shift ring 116.

[0051] Furthermore, when the slurry is filter-pressed, the dial ring 116 rotates relative to the mounting cylinder 11, and the arc groove 117 on the dial ring 116 pushes the tenon 115 to move, and the tenon 115 drives the connecting block 114 and the movable plate 113 to move, and the movable plate 113 moves toward the center of the mounting cylinder 11, and multiple movable plates 113 gradually move closer to form a limiting cylinder 136, and the inner diameter of the limiting cylinder 136 is the same as the inner diameter of the extrusion chamber 112. At this time, the pressure plate 126 moves downward to filter the slurry in the stirring chamber 111 and the extrusion chamber 112 synchronously, so as to capture the particulate matter in the slurry as much as possible so that the limestone powder and water can be re-added later.

[0052] As another embodiment further provided by the present invention, a third flow channel 133 and a fourth flow channel 134 are symmetrically opened on the mounting cylinder 11 for allowing limestone powder and water to enter the stirring chamber 111. The mounting cylinder 11 is provided with multiple sealing sheets 125 adapted to the pressure plate 126.

[0053] Specifically, a liquid level sensor is provided inside the installation cylinder 11 , and the sealing sheet 125 is a flexible sulfur-resistant plastic sheet.

[0054] Furthermore, after the filtration work is completed, the mounting rod 12 drives the pressure plate 126 to move upward until the pressure plate 126 is flush with the sealing piece 125. At this time, the pressure plate 126 cooperates with the sealing piece 125 to seal the top of the stirring chamber 111. At this time, an appropriate amount of limestone powder can be added from the third flow channel 133. The pressure plate 126 and the sealing piece 125 limit the dust generated when the limestone powder is added, and according to the liquid level sensed by the liquid level sensor, an appropriate amount of water is injected from the fourth flow channel 134. Then the fan-shaped filter plate 122 switches from the second state to the first state, and the limestone powder is mixed with water to form a limestone slurry for subsequent work.

[0055] As another embodiment further provided by the present invention, a first flow channel 131 for exhaust gas to enter the extrusion chamber 112 is opened on the mounting cylinder 11 , and the fan-shaped filter plate 122 switches from the first state to the second state to close the first flow channel 131 .

[0056] Specifically, a one-way valve is provided at the outlet of the first flow channel 131, a pressure relief flow channel 135 is connected between the first flow channel 131 and the upper part of the stirring chamber 111, a pressure relief valve is provided inside the pressure relief flow channel 135, a baffle 146 for closing the first flow channel 131 is movably provided inside the mounting cylinder 11, a spring is provided between the baffle 146 and the mounting cylinder 11, sulfur concentration sensors are provided inside the first flow channel 131 and inside the exhaust pipe, and the effective components in the limestone slurry inside the treatment unit 1 are judged according to the sulfur concentration detected by the two adjacent sensors. When the sulfur concentration detected by the two adjacent sensors is high and the difference in the values ​​is very small, it indicates that the effective components in the slurry in the treatment unit 1 between the two sensors are very small, and the slurry replacement procedure can be started.

[0057] Furthermore, during normal operation, the exhaust gas continues to enter the extrusion chamber 112 through the first flow channel 131, and the extrusion chamber 112 is at a low position. The movement path of the exhaust gas in the slurry is longer, thereby extending the contact time between the exhaust gas and the slurry, so that the calcium carbonate in the slurry reacts with the sulfur in the exhaust gas. At this time, the air pressure in the first flow channel 131 is normal, and the pressure relief flow channel 135 is in a closed state; when the slurry is replaced, the baffle 146 seals the first flow channel 131 to prevent the slurry in the extrusion chamber 112 from being squeezed by the pressure plate 126 and the pressure is too high to penetrate into the first flow channel 131, and the spring between the baffle 146 and the mounting cylinder 11 is stretched. At this time, the exhaust gas continues to flow in, the air pressure in the first flow channel 131 increases, the pressure relief valve opens, and the exhaust gas in the first flow channel 131 flows to the upper part of the stirring chamber 111 through the pressure relief flow channel 135, and then enters the treatment unit 1 above.

[0058] As another embodiment further provided by the present invention, a guide ring 149 is movably provided on the mounting cylinder 11 for guiding the mounting rod 12 thereon to move up and down. The fan-shaped filter plate 122 switches from the first state to the second state to move the guide ring 149 downward.

[0059] Specifically, the mounting rod 12 is provided with a groove identical to the reciprocating screw rod, the guide ring 149 is provided with a convex block adapted to the groove on the mounting rod 12, the guide block 119 is provided with an electric telescopic rod inside, the output end of the electric telescopic rod is provided with a push ring 141, a connecting rod 129 is provided between the push ring 141 and the guide ring 149, a plurality of vertical slide grooves are provided on the mounting rod 12, the internal rotation of the guide block 119 is provided with a gear ring 124 sleeved on the mounting rod 12, the interior of the gear ring 124 is provided with a convex block extending into the interior of the slide groove, the interior of the guide block 119 is provided with a motor, and the output end of the motor is provided with a There is a gear meshing with the ring gear 124, and the guide block 119 is internally slidingly provided with a first paddle 142 that rests against the lower surface of the push ring 141, a spring is provided between the first paddle 142 and the guide block 119, a first pull cable 143 is provided between the first paddle 142 and the paddle ring 116, a torsion spring is provided between the paddle ring 116 and the mounting tube 11, and an L-shaped second paddle 144 extending to the moving path of one of the movable plates 113 is provided on the mounting tube 11, a second pull cable 145 is provided between the second paddle 144 and the baffle 146, and a spring is provided between the second paddle 144 and the mounting tube 11.

[0060] Furthermore, during operation, the motor outputs torque to drive the gear to rotate, and the gear drives the mounting rod 12 to rotate through the meshing gear ring 124 and the protrusion inside the gear ring 124. At this time, the groove on the mounting rod 12 that is the same as the reciprocating screw rod cooperates with the protrusion on the guide ring 149, and the protrusion pushes the mounting rod 12 to move back and forth in the vertical direction, and the rotation direction of the mounting rod 12 does not need to be changed; when the slurry needs to be replaced, the fan-shaped filter plate 122 is switched from the first state to the second state, and the electric telescopic rod is extended to push the guide ring 149 through the push ring 141 and the connecting rod 129 to drive the mounting rod 12 to move downward, so that the pressure plate 126 formed by the multiple fan-shaped filter plates 122 can move downward a farther distance, thereby facilitating the pressure plate 126 to cooperate with the extrusion The cavity 112 filters the slurry, and at the same time, the push ring 141 presses the first paddle 142 to move downward, and the first paddle 142 drives the paddle ring 116 to rotate through the first cable 143, and the paddle ring 116 pushes multiple movable plates 113 to move together to form a limiting cylinder 136, and the spring between the first paddle 142 and the guide block 119 accumulates elastic potential energy, and the torsion spring between the paddle ring 116 and the mounting cylinder 11 accumulates elastic potential energy, and the movable plate 113 pushes the second paddle 144 during the movement, and the second paddle 144 drives the baffle 146 to move through the second cable 145 to seal the first channel, and the spring between the second paddle 144 and the mounting cylinder 11 accumulates elastic potential energy, and the spring between the baffle 146 and the mounting cylinder 11 accumulates elastic potential energy.

[0061] As another embodiment further provided by the present invention, a guide block 119 for supporting the bottom sealing plate 118 of the extrusion chamber 112 is provided on the mounting cylinder 11, and slopes for guiding the flow of liquid are symmetrically provided on the guide block 119. A slider 147 is provided in the extrusion chamber 112, and the pressure plate 126 presses the slider 147 to open the bottom of the extrusion chamber 112.

[0062] Specifically, a third cable 148 is provided between the slider 147 and the sealing plate 118 . There are two sealing plates 118 . The abutment point of the two sealing plates 118 is located at the top of the guide block 119 . A spring is provided between the two sealing plates 118 and the mounting tube 11 .

[0063] Furthermore, during the filtration process, the pressure plate 126 moves downward to filter the slurry in the slurry pool. When the pressure enters the extrusion chamber 112, the concentration of particulate matter in the liquid in the extrusion chamber 112 is very high. At this time, the pressure plate 126 continues to move downward and contacts the slider 147. The slider 147 of the pressure plate 126 moves downward, and the slider 147 drives the two sealing plates 118 to separate through the third cable 148. The liquid between the pressure plate 126 and the extrusion chamber 112 can be discharged through the gap between the two sealing plates 118, and is guided into the second flow channel 132 by the slope of the guide block 119, and is discharged from the second flow channel 132. Example 2

[0064] A desulfurization and denitrification environmentally friendly flue gas treatment method, based on the desulfurization and denitrification environmentally friendly flue gas treatment system in embodiment 1, further comprising the following steps:

[0065] S1. Exhaust gas is sent into the slurry pool through the first flow channel 131. The sulfur in the exhaust gas reacts with the limestone slurry to form calcium sulfate. The mounting rod 12 drives the fan-shaped filter plate 122 in the first state to rotate, breaking up the bubbles so that the exhaust gas and the slurry are fully in contact.

[0066] S2. After working for a period of time, the rotation speed of the mounting rod 12 is reduced to switch the sector filter plate 122 from the first state to the second state, and the guide ring 149 guides the mounting rod 12 to move downward, so that the pressure plate 126 cooperates with the extrusion cavity 112 to filter the liquid in the slurry pool;

[0067] S3, the bottom of the extrusion chamber 112 is opened to discharge the high-concentration liquid, and the pressure plate 126 moves upward, and the extrusion chamber 112 is reopened;

[0068] S4. The pressure plate 126 cooperates with the sealing plate 125 to seal the slurry pool, and limestone powder and water are added thereto. The sector filter plate 122 switches from the second state to the first state, stirring the liquid to reform the limestone slurry. The above descriptions are merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A desulfurization and denitrification environmentally friendly flue gas treatment system, characterized in that: The invention comprises a processing tower composed of a plurality of processing units stacked and connected in sequence, wherein the processing unit comprises a mounting cylinder and a mounting rod movably mounted in the upper processing unit, the mounting rod extending into the slurry pool of the mounting cylinder and movably provided with a fan-shaped filter plate, the fan-shaped filter plate being assembled for the following two states: In the first state, the fan-shaped filter plate is in a vertical state and rotates with the mounting rod to stir the slurry; In the second state, the plurality of sector filter plates are in the same plane and form a pressure plate, and the pressure plate moves downward along with the mounting rod to cooperate with the slurry pool to filter the slurry; The slurry pool includes a vertically distributed stirring chamber and an extrusion chamber, wherein the diameter of the stirring chamber is larger than that of the extrusion chamber and is adapted to the fan-shaped filter plate in the first state; A plurality of movable plates are movably provided on the side wall of the stirring chamber, and the plurality of movable plates are brought together to form a limiting cylinder adapted to the pressure plate; The mounting cylinder is symmetrically provided with a third flow channel and a fourth flow channel for limestone powder and water to enter the stirring chamber, and the mounting cylinder is provided with a plurality of sealing sheets adapted to the pressure plate; The mounting cylinder is movably provided with a guide ring for guiding the mounting rod thereon to reciprocate up and down. The sector filter plate switches from a first state to a second state to move the guide ring downward.

2. The desulfurization and denitrification environmentally friendly flue gas treatment system according to claim 1 is characterized in that: The sector filter plate moves away from the mounting rod under the action of centrifugal force so as to switch from the second state to the first state.

3. The desulfurization and denitrification environmentally friendly flue gas treatment system according to claim 2 is characterized in that: The mounting cylinder is provided with a first flow channel for exhaust gas to enter the extrusion chamber, and the fan-shaped filter plate is switched from the first state to the second state to close the first flow channel.

4. The desulfurization and denitrification environmentally friendly flue gas treatment system according to claim 3 is characterized in that: The mounting cylinder is provided with a guide block for supporting the bottom sealing plate of the extrusion chamber, and the guide block is symmetrically provided with slopes for guiding the flow of liquid.

5. The desulfurization and denitrification environmentally friendly flue gas treatment system according to claim 4 is characterized in that: A slider is provided in the extrusion cavity, and the pressure plate presses the slider to open the bottom of the extrusion cavity.

6. A desulfurization and denitrification environmentally friendly flue gas treatment method, characterized in that: The desulfurization and denitrification environmentally friendly flue gas treatment system according to claim 5 further includes the following steps: S1. The exhaust gas is sent into the slurry pool through the first flow channel. The sulfur in the exhaust gas reacts with the limestone slurry to form calcium sulfate. The mounting rod drives the fan-shaped filter plate in the first state to rotate, breaking up the bubbles so that the exhaust gas and the slurry are fully in contact. S2. After working for a period of time, the rotation speed of the mounting rod is reduced to switch the sector filter plate from the first state to the second state, and the guide ring guides the mounting rod to move downward, so that the pressure plate cooperates with the extrusion cavity to filter the liquid in the slurry pool; S3, the bottom of the extrusion chamber is opened to discharge the high-concentration liquid, and the pressure plate moves up, and the extrusion chamber is reopened; S4. The pressure plate cooperates with the sealing sheet to seal the slurry pool and add limestone powder and water into it. The fan-shaped filter plate switches from the second state to the first state, and the liquid is stirred to re-form limestone slurry.

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