Electric arc type desulfurization and denitrification device

Abstract

The invention relates to the technical field of desulfurization and denitrification, in particular to an electric arc type desulfurization and denitrification device which comprises a body, an electric arc reaction unit, an air inlet pipe, a main smoke exhaust pipe, an absorption unit and a backflow unit. A rotating cylinder in the absorption unit is driven by flue gas to rotate and is matched with a booster pump and a cooler, so that the flue gas absorptivity can be improved, and sulfur trioxide and nitrogen dioxide are promoted to be absorbed by absorption liquid; the backflow unit can control the closing door to be opened and closed according to the smoke component concentration in the main smoke exhaust pipe, the main smoke exhaust pipe is closed and the backflow pipe is opened when the smoke component concentration exceeds the standard, and the smoke absorption time is prolonged; an auxiliary smoke exhaust pipe is arranged on one side of the main smoke exhaust pipe, when a filter screen of the main smoke exhaust pipe is blocked, smoke can be exhausted through the auxiliary smoke exhaust pipe, the air pressure in the absorption unit is reduced, and an operator can conveniently know and replace the filter screen, the problems that in the prior art, absorption is not thorough, emission cannot be intelligently controlled, and blockage of the filter screen is difficult to perceive are effectively solved, the purification efficiency can be improved, and the service life is prolonged. Flue gas emission is ensured to reach the standard, and stable operation of equipment is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of desulfurization and denitrification, and particularly to an arc-type desulfurization and denitrification device. Background Art

[0002] Nowadays, the scale of industrial production is constantly expanding, and the problem of waste gas treatment is becoming increasingly severe. The content of pollutants such as sulfur dioxide, sulfur trioxide, and nitrogen dioxide in industrial waste gas is relatively high. Excessive emissions will cause great damage to the ecological environment, such as forming acid rain and aggravating air pollution, seriously threatening human health and ecological balance.

[0003] Among many waste gas treatment devices, the spray desulfurization tower is a commonly used desulfurization device. It is located at the end of industrial exhaust equipment and conducts desulfurization treatment on industrial waste gas. After the arc reaction is completed in the arc-type desulfurization and denitrification device, sulfur trioxide and nitrogen dioxide will be generated. These substances need to be absorbed by the absorption liquid and discharged to achieve recycling or up-to-standard emission. However, there are many problems with the existing arc-type desulfurization and denitrification devices: In traditional devices, the contact mode and contact time between the flue gas and the absorption liquid are limited, resulting in insufficient absorption of sulfur trioxide and nitrogen dioxide. The residence time of the flue gas in the device is short, and it cannot be fully mixed with the absorption liquid, causing a large amount of harmful flue gas to be discharged without being fully absorbed, reducing the desulfurization and denitrification efficiency; when the concentration of pollutants in the discharged flue gas is unstable, the existing devices cannot adjust the treatment process in time. When the concentration is too high, the flue gas is discharged before it can be fully absorbed in the absorption unit, resulting in excessive emissions. At the same time, the pressure balance inside the device is easily affected. If it cannot be adjusted in time, it may cause equipment failures and affect normal production; a filter screen is usually provided in the exhaust pipe of the device to filter impurities in the waste gas. However, in actual operation, the filter screen is easily blocked. Due to the lack of effective blockage detection and standby discharge channels, once the filter screen is blocked, it will not only cause the air pressure inside the device to rise and damage the equipment, but also be difficult to detect and clean or replace in time, affecting the continuous and stable operation of the equipment.

[0004] Therefore, an arc-type desulfurization and denitrification device is proposed, which can improve the flue gas absorption degree, enhance the purification efficiency, operate stably and is convenient for maintenance. Summary of the Invention

[0005] The purpose of the present invention is to provide an arc-type desulfurization and denitrification device. By setting an absorption unit, the absorption degree of the flue gas can be improved, the absorption liquid can be promoted to absorb sulfur trioxide and nitrogen dioxide, and the sulfur trioxide and nitrogen dioxide in the discharged flue gas can be reduced, making the flue gas emission meet the standards, so as to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An arc-type desulfurization and denitrification device, comprising:

[0008] The main body, inside which an arc reaction unit is fixedly installed;

[0009] The main exhaust pipe, which is fixedly connected above the main body;

[0010] The absorption unit, which is fixedly connected inside the main body, and the absorption unit communicates with the arc reaction unit through an intake pipe;

[0011] The reflux unit, which is arranged on the side of the main exhaust pipe.

[0012] Preferably, the absorption unit includes a reaction tank, inside which a rotating cylinder is rotatably arranged. The rotating cylinder is made of a flexible steel strip with a thickness of 0.5 - 1 mm. The body and bottom surface of the rotating cylinder are evenly distributed with ventilation holes, and the outer diameter of the rotating cylinder is smaller than the inner diameter of the reaction tank, so that an annular ventilation groove is formed between the rotating cylinder and the reaction tank. The top of the rotating cylinder is hermetically and rotatably connected to the annular groove on the inner wall of the top of the reaction tank; the bottom center of the rotating cylinder is hermetically and rotatably connected to a drain pipe, and the drain pipe extends into the rotating cylinder for discharging the saturated absorption liquid. The bottom of the rotating cylinder is coaxially fixed with an impeller, and the impeller is located in the ventilation groove between the reaction tank and the rotating cylinder. The intake pipe introduces the flue gas along the tangent direction of the reaction tank, and the flue gas pushes the impeller to rotate, thereby driving the rotating cylinder to rotate; multiple layers of trays are arranged at intervals along the axial direction on the inner wall of the rotating cylinder, and the distance between each layer of trays gradually increases from top to bottom; through holes are formed on each layer of the trays, and the aperture diameters of the through holes of multiple layers of the trays gradually increase from top to bottom.

[0013] Preferably, the body of the rotating cylinder is a regular hexahedron structure, and honeycomb ventilation holes are arranged on its six sides and bottom surface; the through holes on the trays and the ventilation holes on the bottom surface of the rotating cylinder are distributed in a vortex shape.

[0014] Preferably, a cooler is fixedly connected to the outside of the main body, and a cooling plate is covered around the outer wall of the absorption unit. The output end of the cooler is fixedly connected to a cooling pipe, and the other end of the cooling pipe is fixedly connected inside the cooling plate. A plurality of copper pipes are arranged in parallel at intervals along the length direction inside the cooling plate, and each of the copper pipes is interconnected through a transverse connecting pipe to form a serpentine cooling circuit, and the copper pipes and the transverse connecting pipes are evenly distributed in a grid shape inside the cooling plate; one end of the cooling pipe is communicated with the cooler, and the other end is connected to the inlet end copper pipe of the serpentine cooling circuit, so that the coolant flows through all the copper pipes and the transverse connecting pipes in sequence.

[0015] Preferably, a liquid inlet pipe is fixedly connected above the absorption unit, a liquid inlet is arranged outside the main body, the liquid inlet pipe is communicated with the liquid inlet, and a drain pipe is arranged at the bottom of the reaction tank and communicated with the outside.

[0016] Preferably, the other end of the intake pipe is communicated with the reaction tank, and a booster pump is fixedly arranged at the connection, the booster pump is fixedly connected to the reaction tank, and the output end of the booster pump is communicated into the reaction tank.

[0017] Preferably, the reflux unit includes a reflux pipe. One end of the reflux pipe is communicated into the main exhaust pipe, and the other end is communicated into the intake pipe. A switch plate is arranged at one end of the reflux pipe in the absorption unit. The upper end of the switch plate is fixedly connected with a first electric telescopic rod, and the first electric telescopic rod is fixedly connected to the outer wall of the absorption unit. The switch plate penetrates through the reflux pipe. A second electric telescopic rod is arranged on the main exhaust pipe. The installation height of the second electric telescopic rod is between the secondary exhaust pipe and the liquid inlet pipe. The second electric telescopic rod is fixedly connected to the outer wall of the liquid inlet pipe. The output end of the second electric telescopic rod extends into the main exhaust pipe. A closing door is arranged at the output end of the second electric telescopic rod. An inductor is arranged below the second electric telescopic rod, and the inductor is fixedly installed in the main exhaust pipe.

[0018] Preferably, an alarm groove matched with the second electric telescopic rod is arranged in the main exhaust pipe, and the alarm groove is arranged at a relative position of the second electric telescopic rod. An alarm button is fixedly arranged in the middle of the alarm groove, and an alarm lamp controlled by the alarm button is fixedly connected to the outside of the body.

[0019] Preferably, a secondary exhaust pipe is arranged on one side of the main exhaust pipe. The secondary exhaust pipe is communicated with the main exhaust pipe. A wind speed sensor is fixedly arranged at the outlet of the main exhaust pipe. Filter nets are fixedly installed in both the main exhaust pipe and the secondary exhaust pipe. A closing unit for opening and closing the secondary exhaust pipe is arranged at the inlet of the secondary exhaust pipe.

[0020] Preferably, the closing unit includes a third electric telescopic rod. The third electric telescopic rod is fixedly connected to the inner wall of the main exhaust pipe, and a partition door for opening and closing the secondary exhaust pipe is fixedly connected to the output end of the third electric telescopic rod.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. For the arc-type desulfurization and denitration device of the present invention, through the unique design of the absorption unit, the rotation cylinder, the booster pump and the cooler work together, significantly improving the flue gas absorption degree. The rotation of the rotation cylinder makes the absorption liquid oscillate, cooperating with the multi-layer tray structure, extending the absorption time of the flue gas in the absorption liquid, and dividing the flue gas during the rising process to increase the contact area between the flue gas and the absorption liquid, accelerating the absorption of sulfur trioxide and nitrogen dioxide; the booster pump increases the flue gas pressure, and the cooler reduces the temperature of the absorption unit, promoting the absorption process from multiple aspects, significantly reducing the harmful components in the discharged flue gas, ensuring that the flue gas emission meets strict standards, effectively improving the desulfurization and denitration efficiency, and reducing environmental pollution.

[0023] 2. The arc desulfurization and denitrification device described in the present invention realizes intelligent monitoring and control of exhaust flue gas through the setting of the reflux unit. The sensor monitors the concentration of sulfur trioxide and nitrogen dioxide in the main exhaust pipe in real time. When the concentration exceeds the standard, the electric telescopic rod 2 moves quickly, the closing door closes the main exhaust pipe, and opens the reflux pipe at the same time, so that the flue gas returns to the absorption unit for secondary full absorption, avoiding excessive flue gas emissions. This intelligent control mechanism not only improves the quality of exhaust flue gas, but also can dynamically adjust the flue gas treatment process according to actual conditions, thereby enhancing the adaptability and stability of the equipment.

[0024] 3. The arc desulfurization and denitrification device described in the present invention provides reliable protection for the safe operation of the equipment through the combination of the alarm slot, the alarm button and the alarm light. When the closed door is closed and the flue gas concentration in the absorption unit remains high for a long time, the pressure will gradually increase. At this time, the closed door triggers the alarm button and the alarm light comes on, promptly reminding the operator to pay attention to the pressure conditions in the absorption unit so that corresponding measures can be taken, such as adjusting the flue gas concentration, checking the operating status of the equipment, etc., to effectively avoid damage to the equipment due to excessive pressure, reduce the risk of safety accidents, and ensure the safe and stable operation of the equipment.

[0025] 4. The arc desulfurization and denitrification device described in the present invention effectively solves the problem of blockage of the filter screen of the main smoke exhaust pipe through the design of the auxiliary smoke exhaust pipe and the closed unit. When the filter screen of the main smoke exhaust pipe is blocked, the wind speed sensor senses the change in the flue gas flow rate and controls the closed unit to open the auxiliary smoke exhaust pipe so that the flue gas can be discharged smoothly, reducing the air pressure in the absorption unit and ensuring that the equipment continues to work normally within a certain period of time. At the same time, the operator can observe whether there is smoke flowing out of the auxiliary smoke exhaust pipe and promptly discover the blockage of the main smoke exhaust pipe, which facilitates the timely replacement of the filter screen, improves the convenience of equipment maintenance, extends the service life of the equipment, and enhances the stability of equipment operation.

[0026] 5. The arc desulfurization and denitrification device described in the present invention adopts a rotating cylinder of the absorption unit made of 0.5-1mm steel strip. The air vents on the cylinder body and the bottom are uniquely designed. The cylinder body can be set to a hexahedral shape, and with the honeycomb air vents and vortex-distributed through holes, the oscillation effect is further aggravated during the rotation process, so that the flue gas forms a rotating and rising vortex flow of tiny bubbles, increasing the contact area and contact time between the flue gas and the absorption liquid, significantly improving the absorption effect, and helping to concentrate the impurities in the rotating cylinder at the six corners, which is convenient for centralized cleaning and improves the contact efficiency between the flue gas and the absorption liquid. The copper tubes and horizontal connecting tubes in the cooling plate form a serpentine cooling loop, which are evenly distributed inside the cooling plate. The strong thermal conductivity of copper is used to efficiently absorb the heat of the absorption unit, evenly cool down, avoid local overheating, ensure stable operation of the equipment, and further improve the desulfurization and denitrification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Structural schematic diagram of the present invention;

[0028] Figure 2 Oblique axonometric view of the present invention;

[0029] Figure 3 General sectional view of the present invention;

[0030] Figure 4 is Figure 3 Enlarged view at A;

[0031] Figure 5 is Figure 3 Enlarged view at B;

[0032] Figure 6 is Figure 3 Enlarged view at C;

[0033] Figure 7 Sectional view of the cooling plate;

[0034] Figure 8 Structural schematic diagram of the rotating cylinder;

[0035] Figure 9 Sectional view of the absorption unit.

[0036] In the figure: 1, main body; 2, arc reaction unit; 3, intake pipe; 4, main exhaust pipe; 401, filter screen; 402, secondary exhaust pipe; 403, closing unit; 4031, electric telescopic rod three; 4032, partition door; 404, wind speed sensor; 5, absorption unit; 503, cooler; 504, cooling plate; 5041, copper pipe; 5042, transverse connecting pipe; 505, cooling pipe; 506, liquid inlet pipe; 5061, liquid inlet; 507, liquid discharge pipe; 508, reaction tank; 5081, rotating cylinder; 5082, tray; 5083, impeller; 6, reflux unit; 601, reflux pipe; 602, switch plate; 603, electric telescopic rod one; 604, electric telescopic rod two; 605, closing door; 606, inductor; 607, alarm groove; 608, alarm button; 609, alarm lamp; 7, booster pump. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figures 1 to 9, the present invention provides an arc-type desulfurization and denitrification device, and the technical solution is as follows:

[0039] An arc-type desulfurization and denitrification device, comprising:

[0040] A main body 1, inside which an arc reaction unit 2 is fixedly installed;

[0041] A main exhaust pipe 4, which is fixedly connected above the main body 1;

[0042] An absorption unit 5, which is fixedly connected inside the main body 1, and the absorption unit 5 communicates with the arc reaction unit 2 through an intake pipe 3;

[0043] A reflux unit 6, which is arranged on the side of the main exhaust pipe 4.

[0044] After the flue gas generated by the arc reaction unit 2 enters the absorption unit 5, the absorption degrees of sulfur trioxide and nitrogen dioxide can be improved through oscillation, pressurization and cooling, and the sulfur trioxide and nitrogen dioxide in the discharged flue gas are reduced. The flue gas entering the absorption unit 5 is discharged from the main exhaust pipe 4. The reflux unit 6 can automatically close the main exhaust pipe 4 when the discharged flue gas exceeds the standard, so that the flue gas is refluxed into the absorption unit 5 for secondary absorption, reducing the sulfur trioxide and nitrogen dioxide in the discharged flue gas.

[0045] As an implementation manner of the present invention, referring to Figures 3 - 9 , the absorption unit 5 includes a reaction tank 508, inside which a rotating cylinder 5081 is rotatably arranged. The rotating cylinder 5081 is made of a flexible steel strip with a thickness of 0.5-1 mm. The barrel body and the bottom surface of the rotating cylinder 5081 are evenly distributed with ventilation holes, and the outer diameter of the rotating cylinder 5081 is smaller than the inner diameter of the reaction tank 508, so that an annular ventilation groove is formed between the rotating cylinder 5081 and the reaction tank 508. The top of the rotating cylinder 5081 is sealingly and rotatably connected to the annular groove on the inner wall of the top of the reaction tank 508; the center of the bottom of the rotating cylinder 5081 is sealingly and rotatably connected to a drain pipe 507, and the drain pipe 507 extends into the rotating cylinder 5081 for discharging the saturated absorption liquid. A impeller 5083 is coaxially fixed at the bottom of the rotating cylinder 5081, and the impeller 5083 is located in the ventilation groove between the reaction tank 508 and the rotating cylinder 5081. The intake pipe 3 introduces flue gas along the tangent direction of the reaction tank 508, and the flue gas pushes the impeller 5083 to rotate and then drives the rotating cylinder 5081 to rotate; a plurality of layers of trays 5082 are arranged at intervals along the axial direction on the inner wall of the rotating cylinder 5081, and the distance between each layer of trays 5082 gradually increases from top to bottom; through holes are formed on each layer of trays 5082, and the through hole diameters of the plurality of layers of trays 5082 gradually increase from top to bottom, which can strengthen the segmentation effect of the flue gas whose volume continuously increases during the rising process, and fully block the rising speed of the flue gas through the plurality of layers of trays 5082, prolonging the residence and absorption time of the flue gas in the absorption liquid.

[0046] After the arc-type desulfurization and denitration device completes the arc reaction, sulfur trioxide and nitrogen dioxide will be generated. These sulfur trioxide and nitrogen dioxide enter the absorption unit 5. The absorption unit 5 is connected to the liquid inlet pipe 506, and the external absorption liquid enters the absorption unit 5 from the liquid inlet 5061. At this time, the rotating cylinder 5081 is filled with the absorption liquid. The flue gas is pumped into the ventilation slot between the reaction tank 508 and the rotating cylinder 5081 through the booster pump 7, and then enters the liquid inside the rotating cylinder 5081 through the ventilation holes on the side wall and bottom of the rotating cylinder 5081 for absorption. At the same time, the flue gas entering the reaction tank 508 along the tangential direction will continuously drive the impeller 5083 to rotate, so that the impeller 5083 drives the entire rotating cylinder 5081 to rotate. The design of the steel strip thickness aims to ensure the structural strength of the rotating cylinder 5081 while making it have a certain flexibility as a whole, facilitating a certain shock effect during rotation. The barrel body and bottom surface of the rotating cylinder 5081 are evenly provided with ventilation holes. The existence of these ventilation holes enables the flue gas to smoothly enter the inside of the rotating cylinder 5081 and fully contact the absorption liquid. The absorption liquid in the rotating cylinder 5081 is fully oscillated, cooperating with the multi-layer tower plates 5082 with vortex holes. The distance between each layer of tower plates 5082 gradually increases from top to bottom, and the through holes on each layer of tower plates 5082 gradually increase from top to bottom. This design can divide the flue gas that continuously expands due to the decreasing pressure during the rising process, so that the flue gas can fully contact the absorption liquid, improving the absorption effect. And the multi-layer tower plates 5082 can form multi-layer partitions to extend the residence time of the flue gas in the absorption liquid and further improve the absorption effect.

[0047] As an implementation manner of the present invention, referring to Figures 8 - 9 , the barrel body of the rotating cylinder 5081 is a regular hexahedron structure, and honeycomb-shaped ventilation holes are provided on its six side surfaces and bottom surface; the through holes on the tower plate 5082 and the ventilation holes on the bottom surface of the rotating cylinder 5081 are distributed in a vortex shape.

[0048] In comparison, under the action of a single centrifugal force, the rotation of the absorption liquid inside the rotating cylinder 5081 with a cylindrical structure is relatively stable. And because the inner wall of the cylindrical structure is relatively smooth, the absorption liquid inside the rotating cylinder 5081 slips relative to the rotating cylinder 5081, making only the part of the absorption liquid in contact with the rotating cylinder 5081 at the outer circle have a larger movement amplitude, and the movement amplitude in the central area is smaller or even forms a local stagnant state, thus affecting the dynamic mixing and absorption effect of the flue gas and the absorption liquid. However, for the rotating cylinder 5081 with a regular hexahedron structure, under the action of the centrifugal force, due to the existence of six corner areas, the absorption liquid is more easily driven to rotate by the rotating cylinder 5081, and the centrifugal radius of the absorption liquid will change during rotation, which can form complex and variable movement trajectories and sufficient shock effects, improving the reaction effect between the absorption liquid and the internal flue gas.

[0049] The honeycomb-shaped ventilation holes on the rotating cylinder 5081 deliver smoke into the interior of the rotating cylinder 5081 as the rotating cylinder 5081 rotates. The honeycomb-shaped ventilation holes can further divide the smoke compared to the round holes, so that the smoke is decomposed into tiny bubble flows when entering the absorption liquid, thereby increasing the contact area between the smoke and the absorption liquid, and further improving the absorption effect.

[0050] As the rotating drum 5081 rotates continuously, the smoke entering the rotating drum 5081 is mixed with the absorption liquid, and the absorption liquid also rotates continuously with the smoke, thereby promoting the continuous absorption of the smoke by the absorption liquid. As the absorption liquid rotates continuously, with the special structure of the regular hexahedron, the impurities in the absorption liquid will gradually accumulate at the six corners inside the rotating drum 5081 under the action of centrifugal force ( Figure 9 The corner where the mark D is located in the middle six places) makes the flue gas inside the rotating cylinder 5081 purer, which is more conducive to the contact and absorption of the flue gas and the absorption liquid, and also facilitates the centralized cleaning of impurities inside the rotating cylinder 5081. In actual use, it is necessary to ensure that the pressure of the flue gas is greater than the pressure of the absorption liquid in the rotating cylinder 5081, firstly to avoid the absorption liquid from leaking from the rotating cylinder 5081 and being wasted, and secondly to allow the flue gas to enter the rotating cylinder 5081 and mix with the absorption liquid, so as to facilitate the absorption of sulfur trioxide and nitrogen dioxide in the flue gas.

[0051] As an embodiment of the present invention, refer to Figures 4 - 7 A cooler 503 is fixedly connected to the outside of the main body 1, and a layer of cooling plate 504 is covered around the outer wall of the absorption unit 5. A cooling pipe 505 is fixedly connected to the output end of the cooler 503, and the other end of the cooling pipe 505 is fixedly connected to the cooling plate 504. A plurality of copper tubes 5041 are arranged in parallel and spaced along the length direction of the cooling plate 504. The copper tubes 5041 are interconnected through transverse connecting tubes 5042 to form a serpentine cooling circuit, and the copper tubes 5041 and the transverse connecting tubes 5042 are evenly distributed in a grid shape inside the cooling plate 504; one end of the cooling tube 505 is connected to the cooler 503, and the other end is connected to the copper tube 5041 at the inlet end of the serpentine cooling circuit, so that the coolant flows through all the copper tubes 5041 and the transverse connecting tubes 5042 in sequence.

[0052] Lowering the temperature can increase the absorbance of the flue gas. Therefore, a cooler 503 is provided. There is a cooling pipe 505 between the cooler 503 and the absorption unit 5. The cooler 503 can absorb the temperature of the cooling pipe 505. After the temperature of the cooling pipe 505 decreases, it can absorb the temperature inside the absorption unit 5, thereby reducing the temperature inside the absorption unit 5. Oscillation and cooling can enable sulfur trioxide and nitrogen dioxide in the flue gas to be quickly absorbed by the absorbent liquid, reducing sulfur trioxide and nitrogen dioxide in the discharged flue gas. Copper has the advantage of strong thermal conductivity and can quickly absorb heat. The uniform distribution of the copper pipes 5041 and the transverse connecting pipes 5042 enables heat to be evenly absorbed, improving the cooling efficiency and thus reducing the temperature inside the absorption unit 5. The copper pipes 5041 are interconnected through the transverse connecting pipes 5042, which can average the heat of each copper pipe 5041 and avoid the phenomenon that the heat of a certain steel pipe is too large, resulting in a decrease in the heat absorption efficiency.

[0053] As an implementation manner of the present invention, referring to Figures 4 - 6 , a liquid inlet pipe 506 is fixedly connected above the absorption unit 5. There is a liquid inlet 5061 outside the main body 1. The liquid inlet pipe 506 is communicated with the liquid inlet 5061. A drain pipe 507 is provided at the bottom of the reaction tank 508 and is communicated with the outside.

[0054] Absorbent liquid needs to be continuously added to the absorption unit 5 to ensure the fluidity of the absorbent liquid, which can maintain the saturation of the liquid. The lower the saturation of the liquid, the faster the flue gas is absorbed. Therefore, the liquid inlet pipe 506 and the drain pipe 507 are provided. The absorbent liquid enters the absorption unit 5 after flowing into the liquid inlet 5061 from the outside and then flows out from the drain pipe 507, ensuring the fluidity of the absorbent liquid, maintaining the saturation of the liquid, and increasing the absorption speed of the flue gas.

[0055] As an implementation manner of the present invention, referring to Figures 1 - 5 , the other end of the air inlet pipe 3 is communicated with the reaction tank 508, and a booster pump 7 is fixedly arranged at the connection, and the booster pump 7 is fixedly connected to the reaction tank 508. The output end of the booster pump 7 is communicated into the reaction tank 508.

[0056] The booster pump 7 is used to increase the pressure of the flue gas. The greater the pressure of the flue gas, the higher the absorbance of the flue gas. The flue gas is pumped into the ventilation groove between the reaction tank 508 and the rotating cylinder 5081 by pressurization to improve the absorbance of the flue gas, enabling sulfur trioxide and nitrogen dioxide in the flue gas to fully react and reducing the emissions. Moreover, the intake pressure of the flue gas is greater than the seepage pressure of the absorbent liquid in the rotating cylinder 5081, which can prevent the absorbent liquid in the rotating cylinder 5081 from flowing back to the ventilation groove through the ventilation holes, ensuring that the flue gas enters the inside of the rotating cylinder 5081 unidirectionally for absorption reaction with the absorbent liquid.

[0057] As an implementation manner of the present invention, referring to Figures 3 - 5, the reflux system 6 includes a reflux pipe 601. One end of the reflux pipe 601 is connected to the main exhaust pipe 4, and the other end is connected to the intake pipe 3. A switch plate 602 is provided at one end of the reflux pipe 601 within the absorption unit 5. The upper end of the switch plate 602 is fixedly connected to a first electric telescopic rod 603, and the first electric telescopic rod 603 is fixedly connected to the outer wall of the absorption unit 5. The switch plate 602 is disposed through the reflux pipe 601. A second electric telescopic rod 604 is provided on the main exhaust pipe 4. The installation height of the second electric telescopic rod 604 is between the auxiliary exhaust pipe 402 and the liquid inlet pipe 506. The second electric telescopic rod 604 is fixedly connected to the outer wall of the liquid inlet pipe 506. The output end of the second electric telescopic rod 604 extends into the main exhaust pipe 4, and a closing door 605 is provided at the output end of the second electric telescopic rod 604. A sensor 606 is provided below the second electric telescopic rod 604, and the sensor 606 is fixedly installed in the main exhaust pipe 4.

[0058] In the flue gas output from the arc reaction unit 2, the concentrations of sulfur trioxide and nitrogen dioxide are not stable. When the concentrations of sulfur trioxide and nitrogen dioxide are high, the absorption time required will also increase. It is possible that the flue gas is discharged from the main exhaust pipe 4 before being completely absorbed in the absorption unit 5, thus failing to meet the emission standards. Therefore, the reflux unit 6 is provided. Under normal circumstances, the first electric telescopic rod 603 is in the extended state, and the second electric telescopic rod 604 is in the contracted state. A sensor 606 is installed in the main exhaust pipe 4. This sensor 606 can judge the concentrations of sulfur trioxide and nitrogen dioxide. When the concentrations of sulfur trioxide and nitrogen dioxide passing through the sensor 606 are too high, the second electric telescopic rod 604 is activated, so that the closing door 605 blocks the main exhaust pipe 4. At the same time, the first electric telescopic rod 603 is activated, so that the switch plate 602 opens the reflux pipe 601. The flue gas will enter the intake pipe 3 through the reflux pipe 601 and is then passed into the absorption unit 5 again through the booster pump 7 for secondary absorption, thereby extending the absorption time of the flue gas in the absorption unit 5. When the concentrations of sulfur trioxide and nitrogen dioxide passing through the sensor 606 return to normal, the first electric telescopic rod 603 returns to the extended state to close the switch plate 602, and the second electric telescopic rod 604 returns to the contracted state to open the closing door 605, so that the discharged flue gas meets the emission standards.

[0059] As an implementation manner of the present invention, referring to Figures 3 - 5 , an alarm groove 607 that cooperates with the second electric telescopic rod 604 is provided in the main exhaust pipe 4, and the alarm groove 607 is disposed at the relative position of the second electric telescopic rod 604. An alarm button 608 is fixedly provided in the middle of the alarm groove 607, and an alarm lamp 609 controlled by the alarm button 608 is fixedly connected to the outside of the main body 1.

[0060] If sulfur trioxide and nitrogen dioxide in the absorption unit 5 remain at a high concentration for a long time, when secondary absorption is carried out in the absorption unit 5, the time taken increases, resulting in the sulfur trioxide and nitrogen dioxide in the absorption unit 5 being unable to be discharged for a long time, and the pressure in the absorption unit 5 increases, which may cause damage to the equipment. Therefore, an alarm button 608 is provided. When the closing door 605 is closed, the alarm button 608 will be triggered, causing the alarm light 609 to light up, reminding external personnel to pay attention to the pressure in the absorption unit 5 and reducing the occurrence of safety accidents.

[0061] As an implementation manner of the present invention, referring to Figures 3 - 5 , a secondary exhaust pipe 402 is provided on one side of the main exhaust pipe 4. The secondary exhaust pipe 402 communicates with the main exhaust pipe 4. A wind speed sensor 404 is fixedly arranged at the outlet of the main exhaust pipe 4. Filter nets 401 are fixedly installed in both the main exhaust pipe 4 and the secondary exhaust pipe 402. A closing unit 403 for opening and closing the secondary exhaust pipe 402 is provided at the inlet of the secondary exhaust pipe 402.

[0062] In the flue gas entering the main exhaust pipe 4 from the absorption unit 5, there are often a small amount of impurities. These impurities are discharged along with the main exhaust pipe 4, which may endanger the surrounding environment. The existing exhaust pipe is a single-tube type, and there is a filter net 401 in the exhaust pipe. However, in the case of blockage of the filter net 401, it cannot be detected and replaced in time. If the blockage time is relatively long, the air pressure in the equipment may increase, thereby damaging the equipment and endangering safety. Therefore, the secondary exhaust pipe 402 is provided. In the case of blockage of the filter net 401 on the main exhaust pipe 4, the flue gas discharged from the main exhaust pipe 4 decreases. The wind speed sensor 404 can sense the flow rate of the flue gas. The wind speed sensor 404 is a unidirectional vortex fan facing the inside of the main exhaust pipe 4 and will not be affected by the wind force in other directions. When the wind speed sensor 404 senses a decrease in the flue gas discharged from the main exhaust pipe 4, it can control the closing unit 403 to open the secondary exhaust pipe 402 to relieve the pressure of the main exhaust pipe 4 and ensure that it can continue to work normally within a certain period of time. External personnel can see the flue gas flowing out of the secondary exhaust pipe 402 and know that the main exhaust pipe 4 is blocked and the filter net 401 inside the main exhaust pipe 4 needs to be replaced.

[0063] As an implementation manner of the present invention, referring to Figures 1 - 3 , the closing unit 403 includes an electric telescopic rod three 4031. The electric telescopic rod three 4031 is fixedly connected to the inner wall of the main exhaust pipe 4, and the output end of the electric telescopic rod three 4031 is fixedly connected to a partition door 4032 for opening and closing the secondary exhaust pipe 402.

[0064] The electric telescopic rod three 4031 is usually in an extended state, so that the partition door 4032 blocks the auxiliary smoke exhaust pipe 402. When the wind speed sensor 404 senses that the smoke discharged from the main smoke exhaust pipe 4 is reduced, the electric telescopic rod three 4031 can be controlled to contract, so that the partition door 4032 is opened, and the smoke can flow out from the auxiliary smoke exhaust pipe 402 to reduce the pressure of the main smoke exhaust pipe 4.

[0065] Working principle: After the arc desulfurization and denitrification device completes the arc reaction, sulfur trioxide and nitrogen dioxide will be produced. These sulfur trioxide and nitrogen dioxide enter the absorption unit 5. The absorption unit 5 is provided with a liquid inlet pipe 506. The external absorption liquid enters the absorption unit 5 from the liquid inlet 5061. At this time, the rotating cylinder 5081 is full of absorption liquid. The flue gas is pumped into the ventilation groove between the reaction box 508 and the rotating cylinder 5081 through the booster pump 7, and then enters the absorption liquid inside the rotating cylinder 5081 through the ventilation holes on the side wall and bottom of the rotating cylinder 5081 for full absorption. The intake pressure of the flue gas is greater than that of the rotating cylinder 508. 1, the seepage pressure of the absorption liquid in the rotating cylinder 5081 can prevent the absorption liquid in the rotating cylinder 5081 from flowing back to the ventilation groove through the ventilation hole, so as to ensure that the smoke enters the rotating cylinder 5081 in a one-way manner to react with the absorption liquid; at the same time, the smoke entering along the tangential direction of the reaction box 508 will continuously drive the impeller 5083 to rotate, so that the impeller 5083 drives the entire rotating cylinder 5081 to rotate, and the absorption liquid in the rotating cylinder 5081 is fully oscillated, and the multi-layer tower plate 5082 with vortex holes in the rotating cylinder 5081 is used to gradually enhance the absorption effect of the smoke from bottom to top. The closer to the liquid level, the holes on the tower plate 5082 The smaller the size, the denser the distribution, and the smaller the spacing between the tower plates 5082, the longer the absorption time of the flue gas in the absorption liquid can be greatly prolonged through layer-by-layer blocking. At the same time, the segmentation effect of the flue gas, which gradually increases in volume as it rises, is enhanced, so that the flue gas is decomposed into tiny bubbles, increasing the contact area with the absorption liquid, thereby accelerating the absorption speed of the absorption liquid to absorb sulfur trioxide and nitrogen dioxide in the flue gas. The rotating cylinder 5081 can also be set to a regular hexahedron shape, using a 0.5-1mm flexible steel belt structure. Under the action of centrifugal force, due to the existence of six angular areas, the absorption liquid is more easily absorbed by the rotating cylinder. 5081 rotates, and the centrifugal radius of the absorption liquid changes during the rotation process, which can form a complex and changeable motion trajectory and a sufficient oscillation effect, thereby improving the reaction effect between the absorption liquid and the internal flue gas. The honeycomb-shaped air holes on the rotating cylinder 5081 and the vortex-shaped air holes on the bottom of the cylinder can further cut the flue gas, forming a vortex-shaped rotating and rising micro-bubble flow inside the absorption liquid, thereby promoting the absorption effect of the absorption liquid. The impurities inside the rotating cylinder 5081 are more likely to stay and accumulate at the six corners under the action of centrifugal force, thereby further improving the mixing effect of the flue gas and the absorption liquid, and facilitating the subsequent centralized cleaning of the impurities.

[0066] Meanwhile, the cooler 503 can absorb the temperature of the cooling pipe 505. After the temperature of the cooling pipe 505 decreases, it can absorb the temperature inside the absorption unit 5, thereby reducing the temperature inside the absorption unit 5. The sufficient oscillation of the liquid in the rotating cylinder and the temperature reduction of the absorption unit 5 by the cooling plate 504 can enable the rapid absorption of sulfur trioxide and nitrogen dioxide in the flue gas. Under normal circumstances, the second electric telescopic rod 604 is in a contracted state. When the concentrations of sulfur trioxide and nitrogen dioxide passing through the sensor 606 are too high, the second electric telescopic rod 604 is activated, causing the closing door 605 to block the main exhaust pipe 4. At the same time, the first electric telescopic rod 603 is activated, causing the switch plate 602 to open the return pipe 601. The flue gas will enter the intake pipe 3 through the return pipe 601 and is passed into the absorption unit 5 again through the booster pump 7 for secondary absorption. When the closing door 605 is closed, the alarm button 608 will be triggered, causing the alarm light 609 to light up, reminding external personnel to pay attention to the pressure inside the absorption unit 5 or adjust the flue gas concentration. When the concentrations of sulfur trioxide and nitrogen dioxide passing through the sensor 606 return to normal, the first electric telescopic rod 603 returns to its extended state, causing the switch plate 602 to close, and the second electric telescopic rod 604 returns to its contracted state, causing the closing door 605 to open. In the case where the filter screen 401 on the main exhaust pipe 4 is blocked, the amount of flue gas discharged from the main exhaust pipe 4 decreases. The wind speed sensor 404 can sense the flow rate of the flue gas and can control the contraction of the third electric telescopic rod 4031, causing the partition door 4032 to open, and the flue gas can flow out through the auxiliary exhaust pipe 402 to relieve the pressure on the main exhaust pipe 4 and ensure that it can continue to work normally within a certain period of time. External personnel can see the flue gas flowing out of the auxiliary exhaust pipe 402 and know that the main exhaust pipe 4 is blocked and need to replace the filter screen 401 inside the main exhaust pipe 4 in time.

[0067] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An arc desulfurization and denitrification device, comprising: A body (1), wherein an arc reaction unit (2) is fixedly installed inside the body (1); A main smoke exhaust pipe (4), wherein the main smoke exhaust pipe (4) is fixedly connected to the upper part of the main body (1); Features: An absorption unit (5), the absorption unit (5) is fixedly connected to the inside of the body (1), and the absorption unit (5) is in communication with the arc reaction unit (2) via an air intake pipe (3); A reflux unit (6), wherein the reflux unit (6) is arranged on a side of the main smoke exhaust pipe (4); The absorption unit (5) comprises a reaction box (508), wherein a rotating cylinder (5081) is rotatably arranged inside the reaction box (508), wherein the rotating cylinder (5081) is made of a flexible steel belt with a thickness of 0.5-1 mm, wherein the cylinder body and the bottom surface of the rotating cylinder (5081) are evenly distributed with ventilation holes, and the outer diameter of the rotating cylinder (5081) is smaller than the inner diameter of the reaction box (508), so that an annular ventilation groove is formed between the rotating cylinder (5081) and the reaction box (508), and the top of the rotating cylinder (5081) is sealed and rotatably connected to the annular groove on the inner wall of the top of the reaction box (508); and a drainage pipe (507) is sealed and rotatably connected to the center of the bottom of the rotating cylinder (5081), and the drainage pipe (507) extends into the rotating cylinder. The interior of the rotating cylinder (5081) is used for discharging saturated absorption liquid. An impeller (5083) is coaxially fixed to the bottom of the rotating cylinder (5081). The impeller (5083) is located in the ventilation groove between the reaction box (508) and the rotating cylinder (5081). The air inlet pipe (3) introduces flue gas along the tangential direction of the reaction box (508). The flue gas drives the impeller (5083) to rotate and then drives the rotating cylinder (5081) to rotate. The inner wall of the rotating cylinder (5081) is provided with multiple layers of tower plates (5082) at intervals along the axial direction. The spacing between the tower plates (5082) of each layer gradually increases from top to bottom. Through holes are opened on each layer of the tower plates (5082), and the aperture of the through holes of the multiple layers of tower plates (5082) gradually increases from top to bottom.

2. The arc desulfurization and denitrification device according to claim 1, characterized in that: The body of the rotating cylinder (5081) is a regular hexahedron structure, and its six side surfaces and bottom surface are all provided with honeycomb-shaped ventilation holes; the through holes on the tower plate (5082) and the ventilation holes on the bottom surface of the rotating cylinder (5081) are distributed in a vortex shape.

3. The arc desulfurization and denitrification device according to claim 1, characterized in that: A cooler (503) is fixedly connected to the outside of the body (1); a layer of cooling plate (504) is covered around the outer wall of the absorption unit (5); a cooling pipe (505) is fixedly connected to the output end of the cooler (503); the other end of the cooling pipe (505) is fixedly connected to the cooling plate (504); a plurality of copper tubes (5041) are arranged in parallel and spaced apart along the length direction of the cooling plate (504); the copper tubes (5041) are interconnected through transverse connecting tubes (5042) to form a serpentine cooling circuit, and the copper tubes (5041) and the transverse connecting tubes (5042) are evenly distributed in a grid shape inside the cooling plate (504); one end of the cooling tube (505) is connected to the cooler (503), and the other end is connected to the copper tube (5041) at the inlet end of the serpentine cooling circuit, so that the coolant flows through all the copper tubes (5041) and the transverse connecting tubes (5042) in sequence.

4. The arc desulfurization and denitrification device according to claim 1, characterized in that: A liquid inlet pipe (506) is fixedly connected to the top of the absorption unit (5), a liquid inlet port (5061) is provided on the outside of the body (1), the liquid inlet pipe (506) is connected to the liquid inlet port (5061), and a liquid discharge pipe (507) is provided at the bottom of the reaction box (508) to communicate with the outside.

5. The arc desulfurization and denitrification device according to claim 1, characterized in that: The other end of the air inlet pipe (3) is connected to the reaction box (508), and a booster pump (7) is fixedly arranged at the connection point. The booster pump (7) is fixedly connected to the reaction box (508), and the output end of the booster pump (7) is connected to the reaction box (508).

6. The arc desulfurization and denitrification device according to claim 1, characterized in that: The reflux unit (6) comprises a reflux pipe (601), one end of the reflux pipe (601) is connected to the main smoke exhaust pipe (4), and the other end is connected to the air intake pipe (3). A switch plate (602) is provided at one end of the reflux pipe (601) in the absorption unit (5). An electric telescopic rod (603) is fixedly connected to the upper end of the switch plate (602). The electric telescopic rod (603) is fixedly connected to the outer wall of the absorption unit (5). The switch plate (602) passes through the reflux pipe (601). An electric telescopic rod (603) is provided on the main smoke exhaust pipe (4). A second telescopic rod (604), wherein the height of the second electric telescopic rod (604) is located between the auxiliary smoke exhaust pipe (402) and the liquid inlet pipe (506), the second electric telescopic rod (604) is fixedly connected to the outer wall of the liquid inlet pipe (506), the output end of the second electric telescopic rod (604) extends into the main smoke exhaust pipe (4), the output end of the second electric telescopic rod (604) is provided with a closed door (605), and a sensor (606) is provided below the second electric telescopic rod (604), and the sensor (606) is fixedly installed in the main smoke exhaust pipe (4).

7. The arc desulfurization and denitrification device according to claim 6, characterized in that: An alarm groove (607) cooperating with the second electric telescopic rod (604) is arranged in the main smoke exhaust pipe (4), and the alarm groove (607) is arranged at a relative position to the second electric telescopic rod (604). An alarm button (608) is fixedly arranged in the middle of the alarm groove (607), and an alarm light (609) controlled by the alarm button (608) is fixedly connected to the outer side of the main body (1).

8. The arc desulfurization and denitrification device according to claim 1, characterized in that: A secondary smoke exhaust pipe (402) is arranged on one side of the main smoke exhaust pipe (4), the secondary smoke exhaust pipe (402) is communicated with the main smoke exhaust pipe (4), a wind speed sensor (404) is fixedly arranged at the outlet of the main smoke exhaust pipe (4), and a filter screen (401) is fixedly installed in both the main smoke exhaust pipe (4) and the secondary smoke exhaust pipe (402); and a sealing unit (403) for opening and closing the secondary smoke exhaust pipe (402) is arranged at the inlet of the secondary smoke exhaust pipe (402).

9. The arc desulfurization and denitrification device according to claim 8, characterized in that: The enclosed unit (403) comprises an electric telescopic rod three (4031), which is fixedly connected to the inner wall of the main smoke exhaust pipe (4), and the output end of the electric telescopic rod three (4031) is fixedly connected to a partition door (4032) for opening and closing the auxiliary smoke exhaust pipe (402).

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