Flue gas purification device for spray roasting hydrochloric acid regeneration

Abstract

The invention relates to the technical field of flue gas purification, and particularly discloses a flue gas purification device for spray roasting hydrochloric acid regeneration, the flue gas purification device comprises a spray tower, the spray tower comprises a shell and a spray part, one side of the shell is provided with a mounting frame, and the spray part is arranged in the shell; the separation assembly comprises a separation pipe, an air inlet pipe and a flow choking block, the separation pipe is in transmission connection with the air exhaust piece through the air inlet pipe, the flow choking block is installed in the separation pipe, and when the exhaust pipe injects smoke into the separation pipe, the smoke is separated in the separation pipe to form cold airflow and hot airflow; ferric oxide particles and hydrogen chloride in the flue gas are respectively centrifugally separated into cold and hot air flows in the separation pipe; the flue gas purification device has the advantages that the flue gas purification efficiency is high, and meanwhile, the economical efficiency of the device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas purification, and in particular to a flue gas purification device for spray roasting hydrochloric acid regeneration. Background Art

[0002] In industrial production processes such as chemical industry, metallurgy, electroplating and metal processing, hydrochloric acid solution is used in large quantities to wash the metal in order to remove oxides and impurities on the metal surface. After repeated use, waste hydrochloric acid liquid will be formed. These waste hydrochloric acid liquids contain high concentrations of acidic substances and metal ions. Direct discharge will cause serious pollution to the environment, so they must be treated or recycled for reuse.

[0003] At present, the spray roasting method is one of the important processes for the resource utilization of waste hydrochloric acid liquid. This process can effectively recover the hydrogen chloride in the waste acid and generate iron oxide by-products; however, in the process of spray roasting, a large amount of high-temperature flue gas is usually generated. The flue gas contains hydrogen chloride, iron oxide particles and other harmful substances. If not properly handled, it will cause serious harm to the atmospheric environment and human health. In current industrial production, flue gas purification technologies mainly include spraying, wet scrubbing and dry adsorption. These purification technologies remove pollutants in flue gas by chemical reaction, physical adsorption or mechanical capture. For example, the spray method is to wash the flue gas by spraying liquid into the flue gas to remove some acid mist and soluble impurities in the flue gas; in addition, some purification technologies also combine multiple purification methods, such as the composite technology of wet scrubbing and atomization dust capture, to improve the purification efficiency.

[0004] Regarding the above-mentioned related technologies, in the actual flue gas purification process, traditional flue gas purification technologies often capture acid mist and dust together, and cannot effectively separate acid mist and dust, which causes inconvenience in subsequent resource recycling. Because the mixed acid mist and dust are difficult to recover hydrochloric acid and iron oxide separately, the resource utilization rate is reduced, which limits its economic value in industrial applications and cannot take into account the dual needs of environmental protection compliance and resource recycling. Summary of the invention

[0005] The present application provides a flue gas purification device for spray roasting hydrochloric acid regeneration. The device does not require an additional power source and heating source, can purify the flue gas after spray washing, and effectively recover two valuable substances, iron oxide and hydrogen chloride, in the flue gas. It not only ensures the environmental protection and purification efficiency of the entire purification device, but also greatly improves the economy of the device.

[0006] The present application provides a flue gas purification device for spray roasting hydrochloric acid regeneration using the following technical solution: A flue gas purification device for spray roasting hydrochloric acid regeneration, comprising: A spray tower, the spray tower comprising a shell and a spray part, a bottom plate is fixedly provided at the bottom end of the shell, a mounting frame is fixedly provided on the bottom plate, the mounting frame is located at one side of the shell, a controller is provided on the mounting frame, an exhaust pipe for flue gas discharge is provided on the shell, the spray part is arranged in the shell, a first solenoid valve is provided on the spray part, and the first solenoid valve is electrically connected to the controller; The air intake pipe is connected with the air inlet pipe at one end to prevent the exhaust gas from leaking out of the outlet pipe, and the exhaust gas can be turned off when the air inlet pipe is turned off.

[0007] By adopting the above technical solution, the separation component is designed by cooperating the air inlet and the baffle in the separation tube, so that the incoming flue gas forms a high-speed rotating vortex in the separation tube, and uses centrifugal force to achieve hot and cold separation of the flue gas. This process can effectively separate the heavier iron oxide particles from the lighter hydrogen chloride and water vapor, thereby improving the separation accuracy and efficiency. In this process, according to the expansion and compression effect of the gas, the hot air flow will rotate along the inner wall of the separation tube, the flow rate will gradually increase and be compressed, so that the hot air flow will gradually heat up. On the contrary, the cold air flow will gradually converge toward the axis of the separation tube, the flow rate will gradually decrease and other expansions will occur, so that the temperature of the cold air flow will gradually decrease. This process ensures the pertinence and efficiency of the separation process of iron oxide particles, hydrogen chloride and water vapor. In addition, compared with traditional purification technology, the separation component can fully utilize the kinetic energy and thermal energy of the flue gas without the need for additional power input, which not only saves energy and reduces operating costs, but is also suitable for use in multiple scenarios in industrial production, thereby enhancing the applicability of the equipment.

[0008] Optionally, it also includes a power component, which includes a power fan and an exhaust piece. The power fan is fixedly provided with a rotating shaft, and the power fan is rotatably arranged in the shell via the rotating shaft. The power fan is located at one end of the shell where the exhaust pipe is provided, and the exhaust piece is arranged at an end of the exhaust pipe away from the shell. The exhaust piece is provided with an input end and an output end, and the exhaust pipe is connected to the input end of the exhaust piece. The power fan can act on the exhaust piece, and when the smoke in the shell is discharged from the exhaust pipe, the smoke will push the power fan to rotate. The power fan can drive the exhaust piece to continuously draw the smoke in the shell, and the smoke in the shell will enter from the input end of the exhaust piece and be discharged from the output end of the exhaust piece after pressurization.

[0009] By adopting the above technical solution, the flue gas drives the power fan to rotate, and at the same time, through the linkage with the exhaust component, the flue gas in the shell is continuously sucked out, forming a stable negative pressure environment, which is conducive to the improvement of flue gas flow and purification effect, thereby realizing the self-circulating suction operation of the purification device.

[0010] The vent plate has a plurality of vents, each of which has a plurality of vents, each of which has a plurality of vents, each of which has a plurality of vents. The vent plate has a plurality of vents, each of which has a plurality of vents. The vent plate has a plurality of vents, each of which has a plurality of vents. The vent plate has a plurality of vents, each of which has a plurality of vents. The inner wall of the air outlet chamber is provided with an exhaust port, the exhaust port is provided with a connecting pipe, the end of the connecting pipe away from the box body is connected to the air inlet pipe, a partition block is fixed in the air outlet chamber, the partition block divides the air outlet chamber into two chambers, the two chambers are respectively set as a first air outlet chamber and a second air outlet chamber, a first connecting hole is provided on the inner wall of the first air outlet chamber, the first connecting hole is connected to the exhaust port, a second connecting hole is provided on the inner wall of the second air outlet chamber, the second connecting hole is connected to the exhaust port, the blocking plate is rotatably arranged between the first connecting hole and the second connecting hole, the blocking plate can One of the first connecting hole and the second connecting hole is selectively blocked; the piston plate is slidably arranged in the compression chamber, a piston rod is fixedly arranged on the piston plate, an end of the piston rod away from the piston plate is slidably penetrated on the box body, a transmission member is arranged at an end of the piston rod away from the piston plate, the piston rod is connected to the rotating shaft through the transmission member, when the flue gas in the shell drives the power fan to rotate, the transmission member can drive the piston plate to slide back and forth in the compression chamber, so that the box body continuously sucks the flue gas in the shell and injects the flue gas into the separation tube for separation.

[0011] By adopting the above technical scheme, the exhaust component is provided with a compression chamber and an exhaust chamber, which are connected by a partition plate and an air inlet groove. The piston plate is connected with the transmission component and can be directly driven by the rotation of the power fan to slide back and forth in the compression chamber. During this period, the cover plate and the sealing plate provided can adaptively and dynamically block and adjust to achieve continuous suction of flue gas, thereby improving the efficiency of flue gas discharge in the spray tower. It not only ensures the operating stability and continuity of the flue gas purification device, but also enables the purification device to complete the continuous suction of flue gas without an additional power source, thereby reducing energy consumption, improving the working efficiency of the device, and greatly improving the overall performance and practical value of the flue gas purification device.

[0012] Optionally, a receiving groove is provided on the blades of the power fan, an extension portion is slidably arranged in the receiving groove, an elastic member and a distance sensor are arranged in the receiving groove, the elastic member is made of phase change material, one end of the elastic member is fixedly connected to the inner wall of the receiving groove, and the other end of the elastic member is fixedly connected to the extension portion, the distance sensor is fixed on the inner wall of the receiving groove, the distance sensor can detect the extension amount of the extension portion into the receiving groove, the distance sensor is electrically connected to the controller, the elastic member can act on the extension portion, the elastic member will shrink as the smoke temperature increases, thereby reducing the blade area of ​​the power fan, and then the controller controls the first solenoid valve to increase the spraying amount of the spray member.

[0013] By adopting the above technical solution, when the flue gas enters the exhaust pipe, the flue gas drives the power fan blades to rotate, and the rotating shaft transmits power to the exhaust component, so that the exhaust component can continuously suck the flue gas in the shell. The rotation speed of the power fan is directly related to the flue gas flow rate, and the flow rate of the flue gas depends on the spray roasting. The more complete the roasting, the higher the flue gas temperature, the higher the flue gas flow rate, and the corresponding higher the concentration of hydrogen chloride and water vapor in the flue gas. At the same time, the content of iron oxide particles may also increase; and through the cooling and washing effect of the spray tower, the high-temperature flue gas is quickly cooled and the impurity particles in the flue gas are captured. Therefore, the spray amount adjustment of the spray component is directly related to the flue gas temperature and component concentration. High-temperature flue gas requires a larger spray amount to ensure that the temperature drops to an appropriate range. At low temperatures, the use of spray liquid needs to be reduced to prevent waste of resources. The elastic part (made of phase change material) on the fan detects the flue gas temperature and adjusts the spraying amount of the spray part in time, which can not only optimize the flue gas purification effect, but also reduce the equipment operation cost; in addition, when the flue gas temperature after spraying is still very high, the fan blade area of ​​the power fan is reduced, and the torque output of the rotating shaft is also reduced. However, due to the high temperature and fast flow rate of the flue gas at this time, it can just compensate for the torque reduction caused by the reduction in the fan blade area; on the contrary, when the flue gas temperature after spraying is low, the fan blade area of ​​the power fan is increased, and the torque of the rotating shaft is also increased, so as to ensure that the exhaust part can always stably and continuously extract the flue gas. By using this dynamic balance, it can not only effectively improve the purification efficiency and ensure that the exhaust part can maintain efficient flue gas emission, but also maintain a stable flow and pressure in the separation tube, providing a good working condition for subsequent separation and purification.

[0014] Optionally, the separation component also includes an auxiliary heating element, which includes a transmission turbofan, a rotating sleeve and a permanent magnet. The separation tube is configured to be made of stainless steel, and the transmission turbofan is rotatably arranged on the side of the connecting seat away from the baffle block. A mounting frame is fixedly provided on the outer peripheral side of the transmission turbofan, and the mounting frame is slidably connected to the inner wall of the separation tube. A plurality of groups of magnetic blocks are fixedly provided on the mounting frame. The rotating sleeve is rotatably sleeved on the separation tube, and the permanent magnet is fixedly embedded on the inner wall of the rotating sleeve. The permanent magnet can attract the magnetic blocks. When the hot air flow in the separation tube drives the transmission turbofan to rotate, the transmission turbofan will drive the rotating sleeve to rotate on the separation tube, thereby heating the separation tube.

[0015] By adopting the above technical solution, the hot air flow drives the transmission turbofan to rotate, and the magnetic attraction between the magnetic block on the transmission turbofan and the permanent magnet of the rotating sleeve causes the rotating sleeve to rotate on the separation tube. Through the electromagnetic effect, the separation tube is evenly heated in the alternating magnetic field without the need for additional electrical energy or external heat source, thereby achieving efficient utilization of flue gas and embodying the green and energy-saving design concept; after the separation tube is heated, the condensation effect of the cold air flow can be further reduced, and the cold air flow can be prevented from precipitating droplets prematurely, thereby maintaining the stability of the stratification of hot and cold air flows in the separation tube; in addition, in the case of iron oxide particles entrained in the hot air flow, the high temperature can reduce the probability of the iron oxide particles adhering to the tube wall, and the separation tube as a conductor will be subjected to the Lorentz force in the alternating magnetic field, and the separation tube itself will vibrate, further reducing the adhesion of the iron oxide particles to the tube wall and avoiding a decrease in the operating efficiency of the device.

[0016] Optionally, the transmission member includes a transmission crankshaft and a transmission rod, the transmission crankshaft is arranged at one end of the rotating shaft close to the casing, one end of the transmission crankshaft is rotatably connected to the support frame, and the other end of the transmission crankshaft is fixedly connected to one end of the rotating shaft close to the casing, the transmission rod is arranged on the transmission crankshaft, one end of the transmission rod is rotatably connected to the transmission crankshaft, and one end of the transmission rod is rotatably connected to an end of the piston rod away from the piston plate. When the flue gas in the shell drives the power fan to rotate, the rotating shaft drives the transmission crankshaft to rotate, and the transmission crankshaft drives the piston plate to slide back and forth in the compression chamber through the transmission rod.

[0017] By adopting the above technical solution and utilizing the setting of the transmission parts (including the transmission crankshaft and the transmission rod), the rotation of the power fan and the reciprocating sliding of the piston plate are linked, thereby realizing continuous suction and efficient transportation of the flue gas. Specifically, the transmission crankshaft drives the rotation of the transmission rod, and then drives the piston plate to slide back and forth in the compression chamber, so that the flue gas can be continuously flowed and pressurized by the suction part, thereby ensuring the high efficiency and continuity in the flue gas treatment process; in addition, the movement of the piston plate is directly driven by the rotation of the power fan, thereby avoiding the use of additional power sources, which not only saves energy costs, but also ensures that the equipment can work stably under different loads. At the same time, the reciprocating motion of the piston plate helps to improve the compression and guiding effect of the flue gas, ensuring that the flue gas can effectively enter the separation tube for subsequent treatment, significantly improving the efficiency and stability of the entire flue gas purification process.

[0018] Optionally, it also includes a screening component, which includes a screening tube, a corona component and a dust collecting component. The screening tube is fixedly mounted on the mounting frame, one end of the screening tube is connected to one end of the separation tube provided with the connecting seat, a high-voltage power supply is arranged on the mounting frame, the corona component is arranged in the screening tube, the corona component is electrically connected to the negative electrode of the high-voltage power supply, and the corona component can generate a negative electrode corona zone in the screening tube, so that when the hot air flow discharged from the separation tube passes through the negative electrode corona zone, the iron oxide particles in the hot air flow are charged with a negative electrode; The dust collecting part includes a rotating plate, a first electrode plate and a second electrode plate. A mounting groove is formed through one end of the sieve tube away from the separation tube. A rotating shaft is fixed on the rotating plate. The rotating plate is rotatably arranged in the mounting groove via the rotating shaft. The first electrode plate is fixed on the inner wall of the sieve tube. The first electrode plate is electrically connected to the positive electrode of the high-voltage power supply. The second electrode plate is fixed on the rotating plate. The second electrode plate is electrically connected to the negative electrode of the high-voltage power supply. The rotating plate and the first electrode plate are symmetrically arranged along the width direction of the sieve tube.

[0019] By adopting the above technical scheme, the corona element generates a negative corona zone in the screening tube, which can effectively treat the iron oxide particles in the flue gas with negative charges. When the hot air flow passes through the negative corona zone, the iron oxide particles will be negatively charged, making it easier to be captured by the subsequent dust collecting device; the dust collecting element includes a rotating plate, a first electrode plate and a second electrode plate, which form an efficient electric field. Through the action of the electric field, the negatively charged iron oxide particles are adsorbed onto the dust collecting plate, thereby achieving the purpose of removing the iron oxide particles in the flue gas and collecting the iron oxide particles according to different particle sizes. The rotation of the rotating plate helps to clean up the accumulated particulate matter, improves the self-cleaning ability and continuous working efficiency of the device, and maintains long-term efficient operation of the equipment.

[0020] Optionally, the screening assembly also includes a dust collecting part, which includes a reduction motor, a sliding screw, a guide rod, a sliding seat, a dust hopper, an air pump and a dust collecting box. A mounting seat is fixedly provided on the outer side wall of the screening tube, the reduction motor is fixedly mounted on the mounting seat, the sliding screw is rotatably connected to the mounting seat, the sliding screw is mounted on the mounting slot through the mounting seat, one end of the sliding screw is fixedly connected to the output end of the reduction motor, the guide rod is fixedly mounted on the mounting slot through the mounting seat, and the guide rod is parallel to the sliding screw The sliding seat is slidably arranged on the guide rod, and the sliding seat is threadedly connected to the sliding screw, a hinged seat is fixedly provided on the sliding seat, a connecting part is fixedly provided on the dust hopper, the connecting part is rotatably connected to the hinged seat, the dust hopper is rotatably arranged on the sliding seat through the connecting part, a scraper is fixedly provided on the dust hopper, the scraper can abut against the second electrode plate, the air pump and the dust box are both fixedly arranged on the mounting seat, the air inlet end of the air pump is connected to the dust hopper, and the air outlet end of the air pump is connected to the dust box.

[0021] By adopting the above technical scheme, the dust collecting part is composed of a reduction motor, a sliding screw, a guide rod, a sliding seat, a dust hopper, an air pump and a dust collecting box. The dust hopper is equipped with a scraper, which can contact the second electrode plate. The scraper continuously scrapes away these deposits as the dust hopper moves back and forth, removes the particles deposited on the second electrode plate, ensures the cleanliness of the second electrode plate, and improves the long-term operation efficiency of the equipment.

[0022] Optionally, it also includes a cooling recovery component, which includes a placement rack, a liquid storage tank and a condenser. The placement rack is fixed on the base plate, the liquid storage tank is arranged below the placement rack, the condenser is arranged in a spiral shape, the condenser is fixed on the placement rack, and the placement rack is provided with several groups of cooling fins, the cooling fins are connected to the outer wall of the condenser, one end of the condenser is connected to one end of the separation tube where the air inlet hole is provided, and the other end of the condenser is connected to the liquid storage tank.

[0023] By adopting the above technical solution, the water vapor, hydrogen chloride and other gas components in the flue gas can be effectively cooled and recovered by using the condenser and the cooling fins. The condenser adopts a spiral design, which can fully carry out heat exchange over a longer path, enhance the cooling effect, and condense the water vapor and hydrogen chloride into liquid, which is collected in the liquid storage tank. This not only helps to reduce gas emissions and improve the flue gas purification effect, but also can recover important chemical components, such as hydrogen chloride, for subsequent utilization; in addition, the outer wall of the condenser increases the heat exchange area with the external environment through the cooling fins, thereby improving the cooling efficiency and reducing the pollution of the cold air flow to the environment. This not only improves the resource recovery efficiency of the equipment, but also optimizes the operating conditions, reduces energy consumption, and enables the device to more effectively recover valuable substances during the industrial flue gas purification process, while reducing pollution to the environment, greatly improving the economy and environmental protection of the device.

[0024] Optionally, a verification piece is provided on the condenser, and the verification piece includes a unwinding drum, a winding drum, a test paper and a color sensor, the unwinding drum and the winding drum are both rotatably arranged on one end of the condenser close to the separation tube, the unwinding drum and the winding drum are distributed in a circle on the condenser, two ends of the test paper are respectively wound around the unwinding drum and the winding drum, and the test paper is slidably passed through the condenser, the test paper and the condenser are sealed, the test paper and the axis of one end of the separation tube are inclined, the test paper is evenly coated with potassium thiocyanate solution, when iron oxide particles are mixed in the cold air flow, the iron oxide will make the test paper turn red, the condenser is provided with a visual window close to one end of the separation tube, the color sensor is mounted above the visual window, the color sensor is facing the test paper, and the color sensor is electrically connected to the controller.

[0025] By adopting the above technical solution, potassium thiocyanate solution is evenly coated on the surface of the test paper. When iron oxide particles are entrained in the cold air flow, the iron oxide particles react with potassium thiocyanate, causing the test paper to change color. This color change can provide real-time feedback on whether the cold air flow contains iron oxide particles, thereby providing an intuitive and dynamic monitoring method.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. While the flue gas drives the power fan to rotate, it continuously draws the flue gas in the shell through the linkage with the suction component, forming a stable negative pressure environment, which is conducive to the flow of flue gas and the improvement of purification effect, thereby realizing the self-circulating suction operation of the purification device; the separation component is designed through the air inlet and the baffle block in the separation tube, so that the incoming flue gas forms a high-speed rotating vortex in the separation tube, and uses centrifugal force to achieve hot and cold separation of the flue gas. This process can effectively separate the heavier iron oxide particles from the lighter hydrogen chloride and water vapor, thereby improving the separation accuracy and efficiency. In this process, according to the expansion and compression effect of the gas, that is, the hot air flow It will rotate and flow along the inner wall of the separation tube, and the flow rate will gradually increase and be compressed, so that the hot air flow will gradually heat up. On the contrary, the cold air will gradually converge toward the axis of the separation tube, and the flow rate will gradually decrease and other expansion will occur, so that the temperature of the cold air flow will gradually decrease. This process ensures the pertinence and efficiency of the separation process of iron oxide particles, hydrogen chloride and water vapor. In addition, compared with traditional purification technology, the power fan drive and separation component work together to fully utilize the kinetic energy and thermal energy of the flue gas without the need for additional power input, which not only saves energy and reduces operating costs, but is also suitable for multiple scenarios in industrial production, enhancing the applicability of the equipment. 2. When the flue gas enters the exhaust pipe, the flue gas drives the power fan blades to rotate, and the rotating shaft transmits power to the exhaust component, so that the exhaust component can continuously suck the flue gas in the shell. The rotation speed of the power fan is directly related to the flue gas flow rate, and the flow rate of the flue gas depends on the spray roasting. The more complete the roasting, the higher the flue gas temperature, the higher the flue gas flow rate, and the corresponding higher the concentration of hydrogen chloride and water vapor in the flue gas. At the same time, the content of iron oxide particles may also increase; and through the cooling and washing effect of the spray tower, the high-temperature flue gas is quickly cooled and the impurity particles in the flue gas are captured. Therefore, the spray amount adjustment of the spray component is directly related to the flue gas temperature and component concentration. High-temperature flue gas requires a larger spray amount to ensure that the temperature drops to an appropriate range. At low temperatures, the use of spray liquid needs to be reduced to prevent waste of resources. The thermal element (made of phase change material) detects the flue gas temperature and adjusts the spraying amount of the spray element in time, which can not only optimize the flue gas purification effect, but also reduce the equipment operation cost; in addition, when the flue gas temperature after spraying is still very high, the fan blade area of ​​the power fan is reduced, and the torque output by the rotating shaft is also reduced. However, since the flue gas temperature is high and the flow rate is fast at this time, it can just compensate for the torque reduction caused by the reduction in the fan blade area; on the contrary, when the flue gas temperature after spraying is low, the fan blade area of ​​the power fan is increased, and the torque of the rotating shaft is also increased, so as to ensure that the exhaust element can always stably and continuously extract the flue gas. By using this dynamic balance, not only the purification efficiency is effectively improved, and it is ensured that the exhaust element can maintain efficient flue gas emission, but also the stable flow and pressure in the separation tube are maintained, providing a good working condition for subsequent separation and purification; 3. The hot air flow drives the transmission turbofan to rotate. The magnetic attraction between the magnetic block on the transmission turbofan and the permanent magnet of the rotating sleeve causes the rotating sleeve to rotate on the separation tube. Through the electromagnetic effect, the separation tube is evenly heated in the alternating magnetic field without the need for additional electrical energy or external heat source, thus achieving efficient utilization of flue gas and reflecting the green and energy-saving design concept. After the separation tube is heated, the condensation effect of the cold air flow can be further reduced, preventing the cold air flow from precipitating droplets too early, thereby maintaining the stability of the stratification of hot and cold air flows in the separation tube. In addition, when iron oxide particles are entrained in the hot air flow, the high temperature can reduce the probability of iron oxide particles adhering to the tube wall, and the separation tube, as a conductor, will be subjected to the Lorentz force in the alternating magnetic field, and the separation tube itself will vibrate, further reducing the adhesion of iron oxide particles to the tube wall and avoiding a decrease in the operating efficiency of the device. 4. The corona element generates a negative corona zone in the screening tube, which can effectively charge the iron oxide particles in the flue gas with negative charges. When the hot air flows through the negative corona zone, the iron oxide particles will be negatively charged, making it easier to be captured by the subsequent dust collecting device; the dust collecting element forms an efficient electric field in the screening tube, and through the action of the electric field, the negatively charged iron oxide particles are adsorbed onto the dust collecting plate, thereby achieving the purpose of removing the iron oxide particles in the flue gas and collecting them according to different particle sizes. The rotation of the rotating plate helps to clean up the accumulated particulate matter, improves the self-cleaning ability and continuous working efficiency of the device, and maintains the long-term efficient operation of the equipment; multiple groups The design of the dust collecting element can not only effectively remove the attached particles in the screening tube, but also realize the zoning collection according to the different particle sizes of iron oxide. While ensuring the purification efficiency of the entire flue gas purification device, it also improves the economic value of the entire purification device. In addition, the impurity removal net effectively removes impurities in the hot air flow, and the impurity removal net with barium oxide coating has good adsorption performance, which can effectively remove harmful substances in the air flow, reduce the mixing of iron oxide particles and impurities, and ensure the purity of iron oxide particles, thereby improving the quality of subsequent recycling process, further improving the overall purification effect of the system, and the entire purification device reaches higher environmental protection standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the flue gas purification device in the embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the half-section structure of the power fan in the embodiment of the present application.

[0029] Figure 3 It is a partial cross-sectional structural schematic diagram of the spray tower in the embodiment of the present application.

[0030] Figure 4 It is a schematic diagram of the explosion structure of the vacuum component in the embodiment of the present application.

[0031] Figure 5It is a schematic diagram of the overall structure of the box in the embodiment of the present application.

[0032] Figure 6 It is a schematic diagram of the partial cross-sectional structure of the separation component in the embodiment of the present application.

[0033] Figure 7 It is a schematic diagram of the overall structure of the screening assembly in the embodiment of the present application.

[0034] Figure 8 It is a schematic diagram of the overall structure of the dust collecting component in the embodiment of the present application.

[0035] Fig. 9 yes Figure 1 Enlarged schematic diagram of part A.

[0036] Reference numerals: 1, spray tower; 11, shell; 111, bottom plate; 112, mounting frame; 113, gas injection pipe; 114, exhaust pipe; 1141, three-way connector; 115, support frame; 116, mounting cavity; 117, guide plate; 12, spray element; 121, first solenoid valve; 122, spray pipe; 123, spray head; 124, infusion tube; 13, waste liquid tank; 14, liquid pump; 2. Controller; 3. Power assembly; 31. Power fan; 311. Rotating shaft; 312. Accommodating groove; 32. Air extraction member; 321. Box; 3211. Air inlet; 3212. Air outlet; 322. Cover plate; 323. Blocking plate; 324. Piston plate; 3241. Piston rod; 325. Partition plate; 3251. Air inlet groove; 326. Connecting pipe; 327. Partition block; 328. Transmission member; 3281. Transmission crankshaft; 3282. Transmission rod; 329. Compression chamber; 330. Air outlet chamber; 3301. First air outlet chamber; 3302. Second air outlet chamber; 3303. First connecting hole; 3304. Second connecting hole; 33. Extension; 34. Elastic member; 35. Distance sensor; 4. Separation assembly; 41. Separation tube; 411. Air inlet; 412. Connecting seat; 42. Air inlet pipe; 421. Sealing cover; 43. Thwart block; 44. Auxiliary heating element; 441. Transmission turbofan; 442. Rotating sleeve; 443. Permanent magnet; 444. Mounting frame; 445. Magnetic block; 5. Screening assembly; 51. Screening tube; 511. Mounting groove; 512. Mounting seat; 52. Corona element; 521. Fixed frame; 522. Electrode rod; 5221. Discharge needle; 53. Dust collecting element; 531. Rotating plate; 5311. Rotating shaft; 532. First electrode plate; 533. Second electrode plate; 534. Dust collecting motor; 54. High voltage power supply; 55. Dust collecting element; 551. Speed ​​reduction motor; 552. Sliding screw rod; 553. Guide rod; 554. Sliding seat; 5541. Articulated seat; 555. Dust hopper; 5551. Connecting part; 556. Air pump; 557. Dust collecting box; 558. Scraper; 56. De-dusting net; 6. Cooling recovery component; 61. Placement rack; 62. Liquid storage box; 63. Condenser; 64. Verification part; 641. Unwinding reel; 642. Rewinding reel; 643. Test paper; 644. Color sensor. DETAILED DESCRIPTION

[0037] First of all, it should be noted that the production process of spray roasting hydrochloric acid regeneration includes the following steps: P1. Waste acid roasting: The waste acid liquid enters the reactor, undergoes chemical reactions at high temperatures, and releases flue gas, the main components of which are water vapor, hydrogen chloride, carbon dioxide, nitrogen, and trace amounts of iron oxide particles; P2. Flue gas cooling and preliminary dust removal: The waste acid liquid is sprayed on the high-temperature flue gas, and the high-temperature flue gas is rapidly cooled to 100°C. The water in the waste acid liquid evaporates and takes away some iron oxide particles; P3, gas-liquid separation: The gas-liquid mixture after spraying in the first spray tower enters the steam-water separator, where the liquid and gas are separated. Part of the separated liquid returns to the first spray tower for circulation, and the other part returns to the reactor for continued roasting; P4. Hydrogen chloride absorption and regeneration acid generation: The temperature of the gas separated from the steam-water separator is about 90℃~100℃. The flue gas is injected into the absorption tower. At this time, the flue gas is sprayed with water to absorb hydrogen chloride. The hydrogen chloride will be absorbed by water to form regeneration acid. The regeneration acid will flow into the regeneration acid storage tank for storage for subsequent use. P5. Secondary absorption of hydrogen chloride and preheating of waste acid liquid: The flue gas treated by the absorption tower is introduced into the waste acid washing tower, where the flue gas will be sprayed and washed by the waste acid liquid to further absorb the residual hydrogen chloride in the flue gas. At the same time, the waste acid liquid is preheated to save energy. At the same time, the washed waste acid liquid will be sent back to the steam-water separator for concentration to ensure the recovery of iron oxide particles.

[0038] P6, Secondary spray washing: The flue gas after being treated in the waste acid washing tower is sent to the second spray tower to further remove residual iron oxide particles and pollutants; P7. Removal of large particles: The flue gas after secondary spray scrubbing will be injected into the Venturi scrubber. The flue gas will be processed by the Venturi scrubber, and the larger iron oxide particles in the flue gas will be captured by the Venturi scrubber; P8. Fine particle removal: The cleaned flue gas will be injected into the dynamic wave scrubber, which will further remove the fine iron oxide particles in the flue gas through strong wave action and spraying of acidic liquid in the dynamic wave scrubber; P9. Hydrogen chloride removal: The flue gas treated by the power wave scrubber enters the desalted water scrubber, which uses desalted water or industrial water to absorb the residual hydrogen chloride in the flue gas to ensure that the hydrogen chloride content in the flue gas is as low as possible; P10. Fine particle capture: After passing through the desalted water washing tower, the flue gas enters the wet electrostatic precipitator, which captures tiny dust in the flue gas through the action of the electric field to further purify the flue gas.

[0039] The following is combined with Figure 1-9 This application is described in further detail.

[0040] The embodiment of the present application discloses a flue gas purification device for spray roasting hydrochloric acid regeneration.

[0041] Reference Figure 1 , refer to Figure 1 The flue gas purification device for spray roasting hydrochloric acid regeneration includes a spray tower 1, a controller 2, a power assembly 3, a separation assembly 4, a screening assembly 5 and a cooling recovery assembly 6. The controller 2 and the power assembly 3 are installed on the spray tower 1, the separation assembly 4 is installed on one side of the power assembly 3, and the screening assembly 5 and the cooling recovery assembly 6 are installed on both sides of the separation assembly 4 respectively.

[0042] The spray tower 1 can spray waste acid liquid into the flue gas to wash the flue gas, effectively removing part of the acid mist and soluble impurities in the flue gas; the controller 2 can control the electrical components in the entire device; the power component 3 can use the flue gas as a power source, so that the power component 3 can automatically suck the flue gas after spraying and washing in the spray tower 1, and inject the flue gas into the separation component 4; the separation component 4 can use the kinetic energy of the flue gas flow to achieve centrifugal diversion, so that the flue gas is centrifuged to form two groups of hot and cold airflows, and can heat the hot airflow and cool the cold airflow, thereby separating iron oxide particles, hydrogen chloride and water vapor of different qualities; the screening component 5 can recycle iron oxide of different particle sizes by division; the cooling recovery component 6 can recycle the hydrogen chloride separated from the flue gas.

[0043] Reference Figure 1 , Figure 2 and Figure 3In the embodiment of the present application, the spray tower 1 includes a shell 11, a base plate 111, a mounting frame 112, a waste liquid tank 13 and a spray element 12. The shell 11 is configured to be cylindrical, and the shell 11 is mounted on the base plate 111. The bottom end of the shell 11 is fixedly connected to the base plate 111. A mounting frame 112 is fixedly provided on the base plate 111. The mounting frame 112 is located on one side of the shell 11, and the controller 2 is mounted on the mounting frame 112.

[0044] An exhaust pipe 114 and an air injection pipe 113 are provided on the shell 11. The exhaust pipe 114 can discharge the smoke after washing, and the air injection pipe 113 injects the smoke generated after spray roasting into the spray tower 1 for spray washing. The exhaust pipe 114 and the air injection pipe 113 are respectively arranged at both ends of the shell 11 in the vertical direction. The exhaust pipe 114 is located above the air injection pipe 113. The exhaust pipe 114 is fixed at the top of the shell 11 in the vertical direction. The waste liquid tank 13 is installed on one side of the shell 11. The waste liquid tank 13 is connected to the shell 11. A liquid pump 14 is installed on the waste liquid tank 13, and the input end of the liquid pump 14 is connected to the waste liquid tank 13.

[0045] The spray component 12 includes a nozzle 122, a nozzle 123, a liquid infusion tube 124 and a first solenoid valve 121. The nozzle 122 is installed in the shell 11, and the nozzle 123 is fixed on the nozzle 122. Multiple groups of nozzles 123 are arranged on the nozzle 122. One end of the liquid infusion tube 124 is connected to the nozzle 122, and the other end of the liquid infusion tube 124 is connected to the output end of the liquid pump 14. The first solenoid valve 121 is installed on the liquid infusion tube 124. The first solenoid valve 121 is electrically connected to the controller 2. The liquid pump 14 can inject the waste acid liquid in the waste liquid tank 13 into the nozzle 122, and then spray the waste acid liquid into the flue gas through the nozzle 123, so as to wash the flue gas to remove part of the acid mist and soluble impurities therein.

[0046] Two groups of spray parts 12 are arranged in the shell 11. The two groups of spray parts 12 are arranged at equal intervals along the height direction of the shell 11. A filter screen is also installed under each group of spray parts 12. The flue gas washed with waste acid will enter the power component 3 from the exhaust pipe 114 on the shell 11.

[0047] Reference Figure 2 and Figure 3The power assembly 3 includes a power fan 31, an extension 33, an elastic member 34, a distance sensor 35, a piston plate 324, an air extraction member 32 and a transmission member 328. Two groups of limit blocks are fixed in the housing 11. The two groups of limit blocks are arranged symmetrically on the circumference. The two groups of limit blocks are located at the top of the housing 11. The two groups of limit blocks separate the housing 11 into an installation cavity 116 for installing the power fan 31. The installation cavity 116 is connected to the internal chamber of the housing 11. The power fan 31 is coaxially fixed. There is a rotating shaft 311, which is rotatably installed on the shell 11. The power fan 31 is rotatably installed in the installation cavity 116 through the rotating shaft 311. The power fan 31 is located directly below the exhaust pipe 114. A guide plate 117 is installed directly below the power fan 31. One end of the guide plate 117 is fixedly connected to a group of limit blocks. The guide plate 117 is inclined to the axis of the shell 11. The guide plate 117 can enable the smoke to smoothly push the power fan 31 to rotate in one direction.

[0048] The blades of the power fan 31 are arranged in a straight plate shape, and a receiving groove 312 is opened on the blades of the power fan 31. The extension part 33 is slidably arranged in the receiving groove 312. The extension part 33 is also arranged in a straight plate shape. The size of the extension part 33 is slightly smaller than the blades of the power fan 31. The elastic part 34 is arranged to be made of phase change material. The specific phase change property is that the elastic part 34 will gradually shrink with the increase of temperature. In the embodiment of the present application, the elastic part 34 can be arranged as a spring supported by nickel-titanium alloy. The elastic part 34 is arranged in the receiving groove 312, and one end of the elastic part 34 is fixedly connected to the inner wall of the receiving groove 312, and the other end of the elastic part 34 is fixedly connected to the extension part 33.

[0049] The distance sensor 35 is fixed on the inner bottom wall of the receiving groove 312. The distance sensor 35 can detect the extension amount of the extension portion 33 into the receiving groove 312. The distance sensor 35 is electrically connected to the controller 2. The piston plate 324 is slidably arranged in the compression chamber 329. The piston plate 324 and the inner wall of the compression chamber 329 are sealed. A piston rod 3241 is fixed on the piston plate 324. One end of the piston rod 3241 away from the piston plate 324 is slidably penetrated on the box body 321, and the piston rod 3241 is arranged parallel to the length direction of the partition plate 325.

[0050] Reference Figure 3 , Figure 4 and Figure 5The air extraction member 32 includes a box body 321, a cover plate 322, a blocking plate 323 and a piston plate 324. A support frame 115 is fixedly provided on the bottom plate 111. The support frame 115 is located on one side of the housing 11. The box body 321 is fixedly provided on the support frame 115. A partition plate 325 is fixedly provided inside the box body 321. The partition plate 325 divides the box body 321 into two chambers along the height direction. The two chambers are respectively set as a compression chamber 329 and an air outlet chamber 330. An air inlet groove 3251 is provided on the partition plate 325. The air inlet groove 3251 is located at one end of the partition plate 325 in the length direction. The compression chamber 329 is connected with the air outlet chamber 330 through the air inlet groove 3251. An air inlet port 3211 is provided through the inner wall of the compression chamber 329. The air inlet port 3211 is located above the air inlet groove 3251.

[0051] A rotating seat is fixed on the inner wall of the compression chamber 329, and a rotating part is fixed on one end of the cover plate 322, and the rotating part is rotatably connected to the rotating seat. The cover plate 322 is rotatably arranged on the air inlet 3211 through the rotating part, and the cover plate 322 can block the air inlet 3211. In the embodiment of the present application, two groups of air inlet grooves 3251, air inlet 3211 and cover plate 322 are arranged, and the two groups of air inlet grooves 3251, air inlet 3211 and cover plate 322 are symmetrically arranged along the length direction of the box body 321. A three-way connector 1141 is installed at one end of the exhaust pipe 114 away from the shell 11, and the exhaust pipe 114 is connected to the box body 321 through the three-way connector 1141.

[0052] An exhaust port 3212 is provided on the inner wall of the air outlet chamber 330, and a connecting pipe 326 is provided on the exhaust port 3212. The diameter of the connecting pipe 326 is smaller than the diameter of the exhaust pipe 114. The box body 321 is connected to the separation component 4 through the connecting pipe 326. A partition block 327 is fixedly provided in the air outlet chamber 330. The partition block 327 is set as a trapezoidal block, and the cross-section of the partition block 327 along the length direction of the air outlet chamber 330 is an isosceles trapezoid. The partition block 327 divides the air outlet chamber 330 into two chambers, which are respectively set as a first air outlet chamber 3301 and a second air outlet chamber 3302. A first connecting hole 3303 is provided on the inner wall of the first air outlet chamber 3301, and the first connecting hole 3303 is connected to the exhaust port 3212. A second connecting hole 3304 is provided on the inner wall of the second air outlet chamber 3302, and the second connecting hole 3304 is also connected to the exhaust port 3212. The blocking plate 323 is rotatably disposed in the air outlet chamber 330, one end of the blocking plate 323 is rotatably abutted against the partition block 327, and the other end of the blocking plate 323 extends into the exhaust port 3212. The blocking plate 323 is located between the first connecting hole 3303 and the second connecting hole 3304. The blocking plate 323 can selectively block one of the first connecting hole 3303 and the second connecting hole 3304.

[0053] The transmission member 328 includes a transmission crankshaft 3281 and a transmission rod 3282. The transmission crankshaft 3281 is arranged at one end of the rotating shaft 311 close to the box body 321, one end of the transmission crankshaft 3281 is rotatably connected to the support frame 115, and the other end of the transmission crankshaft 3281 is fixedly connected to one end of the rotating shaft 311 close to the box body 321. The transmission rod 3282 is arranged on the transmission crankshaft 3281, one end of the transmission rod 3282 is rotatably connected to the transmission crankshaft 3281, and the other end of the transmission is rotatably connected to the end of the piston rod 3241 away from the piston plate 324.

[0054] More specifically, refer to Figure 1 For ease of understanding, the two groups of air inlet grooves 3251, air inlet ports 3211 and cover plates 322, those located on one side of the piston rod 3241, are set as first air inlet grooves, first air inlet ports and first cover plates, and the air inlet grooves 3251, air inlet ports 3211 and cover plates 322 away from the side of the piston rod 3241 are set as second air inlet grooves, second air inlet ports and second cover plates.

[0055] The flue gas after spray washing in the shell 11 is guided by the guide plate 117, and the flue gas drives the power fan 31 to rotate. The transmission crankshaft 3281 will rotate with the rotation of the power fan 31, and the transmission rod 3282 on the transmission crankshaft 3281 drives the piston rod 3241 to slide back and forth on the box body 321, so that the piston plate 324 slides back and forth in the compression chamber 329.

[0056] When the piston plate 324 slides from the first air inlet groove to the second air inlet groove in the compression chamber 329, the second cover plate will be pressed on the second air inlet port due to the increased pressure on the side of the piston plate 324 away from the piston rod 3241, and the flue gas in the exhaust pipe 114 is injected into the compression chamber 329 from the first air inlet port through the three-way connector 1141; in this process, the gas on the side of the piston plate 324 away from the piston rod 3241 will be pressed into the second air outlet chamber 3302, so the pressure in the second air outlet chamber 3302 increases, and the sealing plate 323 will deflect toward the first connecting hole 3303, and the sealing plate 323 will block the first connecting hole 3303, and as the piston plate 324 continues to slide toward the second air inlet groove, the gas in the second air outlet chamber 3302 is finally discharged from the exhaust port 3212.

[0057] When the piston plate 324 slides to the extreme position toward the second air inlet groove, the piston plate 324 will start to slide from the second air inlet groove to the first air inlet groove under the drive of the transmission crankshaft 3281. At this time, the first cover plate will be pressed on the first air outlet, and the flue gas originally from the first air inlet will be pressed into the first air outlet chamber 3301 from the first air inlet groove. As the piston plate 324 slides, the second cover plate will deflect toward the piston plate 324, and the second air inlet will be opened. The flue gas in the exhaust pipe 114 will be injected into the compression chamber 329 through the second air inlet. In this process, the sealing plate 323 will swing from the first connecting hole 3303 to the second connecting hole 3304, and the sealing plate 323 will block the second connecting hole 3304. The flue gas in the first air outlet chamber 3301 will be discharged from the exhaust port 3212 through the first connecting hole 3303.

[0058] Therefore, when the smoke in the housing 11 drives the power fan 31 to rotate, the piston plate 324 will make a reciprocating sliding motion in the compression chamber 329 driven by the transmission crankshaft 3281, so as to automatically suck out the smoke in the housing 11, and the smoke is injected into the separation component 4 through the exhaust port 3212. It is worth noting here that since the elastic member 34 will shrink as the smoke temperature increases, when the smoke temperature rises, the distance sensor 35 will detect that the extension portion 33 extends more, and then the controller 2 can control the first solenoid valve 121 to open more, and the amount of liquid in the nozzle 122 to increase, so as to ensure that the smoke can be fully cooled while being washed.

[0059] Reference Figure 6 The separation component 4 includes a separation tube 41, an air inlet pipe 42, a baffle 43, and an auxiliary heating element 44. A fixing seat is fixed on the mounting frame 112. The separation tube 41 is made of stainless steel. The separation tube 41 is fixedly sleeved on the fixing seat. The separation tube 41 should be fixed on the mounting frame 112 by the fixing seat, and a rubber buffer layer is padded between the fixing seat and the separation tube 41. An air inlet hole 411 is opened at one end of the separation tube 41. The axis of the air inlet hole 411 is tangent to the inner wall of the separation tube 41. A plurality of groups of air inlet holes 411 are arranged on the separation tube 41. The plurality of groups of air inlet holes 411 are distributed circumferentially on the separation tube 41. One end of the separation tube 41 with the air inlet hole 411 is closed.

[0060] One end of the separation tube 41 having an air inlet hole 411 is connected to the cooling recovery component 6, and the other end of the separation tube 41 is connected to the screening component 5. One end of the air inlet pipe 42 is connected to the connecting pipe 326, and the other end of the air inlet pipe 42 is fixed with a sealing cover 421, which is sleeved on the separation tube 41 and covered on the air inlet hole 411. The air inlet pipe 42 is connected to the air inlet hole 411 through the sealing cover 421.

[0061] A connecting seat 412 is fixedly provided on the inner wall of the separation tube 41, and the connecting seat 412 is located at the end of the separation tube 41 away from the air inlet 411. The baffle block 43 is configured to be a pointed cone. In the embodiment of the present application, the baffle block 43 is configured to be a cone and the diameter of the baffle block 43 is smaller than the diameter of the separation tube 41. The baffle block 43 is fixed on the connecting seat 412, and the baffle block 43 and the separation tube 41 are coaxially arranged, and the tip of the baffle block 43 faces the end of the separation tube 41 where the air inlet 411 is provided.

[0062] The auxiliary heating element 44 includes a transmission turbofan 441, a rotating sleeve 442 and a permanent magnet 443. The transmission turbofan 441 is installed in the separation tube 41. The transmission turbofan 441 is rotatably arranged on the side of the connecting seat 412 away from the baffle block 43. A mounting frame 444 is fixedly provided on the outer peripheral side of the transmission turbofan 441. The mounting frame 444 is slidably connected to the inner wall of the separation tube 41. A plurality of groups of magnetic blocks 445 are fixedly embedded on the mounting frame 444. The plurality of groups of magnetic blocks 445 are distributed in a circle on the mounting frame 444.

[0063] A limiting portion is fixedly provided on the outer peripheral wall of the separation tube 41, and the rotating sleeve 442 is rotatably sleeved on the separation tube 41 through the limiting portion. The length of the rotating sleeve 442 is smaller than the length of the separation tube 41, and the permanent magnet 443 is fixedly embedded on the inner wall of the rotating sleeve 442. Multiple groups of permanent magnets 443 are arranged on the rotating sleeve 442, and the multiple groups of permanent magnets 443 are distributed in a circle on the rotating sleeve 442. The permanent magnets 443 can attract each other with the magnetic block 445. In the embodiment of the present application, six groups of permanent magnets 443 are arranged, and the sizes of each two adjacent groups of permanent magnets 443 are different.

[0064] More specifically, under the action of the piston plate 324, when the flue gas is injected into the separation tube 41 through the connecting tube 326, the flue gas itself has a certain temperature and pressure. Because the diameter of the connecting tube 326 is smaller than the diameter of the exhaust pipe 114, the flow rate of the flue gas discharged from the connecting tube 326 increases. When the flue gas is injected into the separation tube 41 through the air inlet 411, a high-speed rotating flue gas vortex will be formed in the separation tube 41.

[0065] According to the expansion and compression effect of gas, that is, when the gas rotates in the pipe, due to the action of centrifugal force, part of the airflow will be forced to flow to the outside of the pipe, and part of the airflow will flow to the inside of the pipe. The flow rate of the outer airflow will gradually increase as the gas rotates in the pipe, and the flow rate of the inner airflow will gradually decrease. Correspondingly, the outer airflow is gradually compressed as the flow rate increases, and the temperature of the gas will gradually rise. The inner airflow gradually expands as the flow rate decreases, and the temperature of the gas will gradually decrease.

[0066] Under the centrifugal effect, part of the flue gas is forced to flow toward the inner wall of the separation tube 41, resulting in the formation of two different airflows, hot and cold. At the same time, the iron oxide particles, hydrogen chloride and water vapor contained in the flue gas will be separated by centrifugal effect. Since the relative mass of iron oxide is greater than the relative mass of hydrogen chloride and water, iron oxide will gradually be separated into the hot airflow, while hydrogen chloride and water will be separated into the cold airflow. It is worth noting here that the heating or cooling of the airflow here is the conversion of internal energy, so the temperature difference is within a certain range.

[0067] The baffle 43 arranged in the separation tube 41 will block the cold air flow from being discharged from the end of the separation tube 41 provided with the connecting seat 412, thereby forcing the cold air flow to be discharged from the end of the separation tube 41 provided with the air inlet hole 411; while the end surface of the separation tube 41 provided with the air inlet hole 411 is arranged in a closed setting, which is just the opposite. The hot air flow will be blocked and discharged from the end of the separation tube 41 provided with the connecting seat 412, and it can also prevent the smoke just injected from being directly discharged from the end of the separation tube 41 provided with the air inlet hole 411.

[0068] At the same time, the transmission turbofan 441 arranged on the connecting seat 412 will be pushed by the hot air flow, so as to rotate in the separation tube 41. Since the permanent magnet 443 can attract the magnetic block 445, the rotating sleeve 442 rotatably sleeved on the separation tube 41 will also rotate with the rotation of the transmission turbofan 441. The separation tube 41 is made of stainless steel. Therefore, with the rotation of the rotating sleeve 442, an alternating magnetic field will be applied around the separation tube 41. According to Faraday's law of electromagnetic induction, a conductor will generate an induced current in the alternating magnetic field, so that the separation tube 41 The hot air flow is further heated to above 300°C by Joule heat, preventing hydrogen chloride and water vapor from forming small droplets in the cold air flow and being carried into the hot air flow; at the same time, due to the difference in sizes of the two adjacent groups of permanent magnets 443 on the rotating sleeve 442, the induced current inside the separation tube 41 will be affected by the Lorentz force in the alternating magnetic field. As the alternating magnetic field changes periodically, the size and left and right directions of the Lorentz force also change, causing the separation tube 41 to produce high-frequency vibrations, thereby preventing iron oxide scaling on the inner wall of the separation tube 41.

[0069] Reference Figure 7 and Figure 8In the embodiment of the present application, the screening component 5 includes a screening tube 51, a high-voltage power supply 54, a debris removal net 56, a corona component 52, a dust collecting component 53, and a dust collecting component 55. The screening tube 51 is fixedly mounted on the mounting frame 112. One end of the screening tube 51 is connected to one end of the separation tube 41 provided with a connecting seat 412. The high-voltage power supply 54 is fixedly mounted on the mounting frame 112. The debris removal net 56 is fixedly mounted in the screening tube 51. The debris removal net 56 is located at one end of the screening tube 51 close to the separation tube 41. A barium oxide coating is provided on the debris removal net 56. In the embodiment of the present application, three groups of debris removal nets 56 are provided, and the three groups of debris removal nets 56 are evenly spaced in the screening tube 51.

[0070] The impurity removal net 56 can effectively remove impurities in the hot air flow. The impurity removal net 56 with a barium oxide coating has good adsorption performance and can effectively remove a small amount of water vapor and hydrogen chloride that may be mixed in the air flow, thereby reducing the mixing of iron oxide particles and impurities, ensuring the purity of the iron oxide particles, and thus improving the quality in the subsequent recycling process, further improving the overall purification effect of the system, and the entire purification device reaches a higher environmental protection standard.

[0071] The corona device 52 is arranged in the screening tube 51, and the corona device 52 includes a fixed frame 521 and an electrode rod 522. The fixed frame 521 is arranged on the inner wall of the screening tube 51, and the fixed frame 521 is located on the side of the impurity removal net 56 away from the separation tube 41. The electrode rod 522 is fixed on the fixed frame 521, and the electrode rod 522 is electrically connected to the negative pole of the high-voltage power supply 54. A plurality of groups of discharge needles 5221 are arranged at equal intervals on the electrode rod 522, and a plurality of groups of electrode rods 522 are arranged on the fixed frame 521, and the plurality of groups of electrode rods 522 are arranged and distributed along the length direction of the fixed frame 521.

[0072] The dust collecting member 53 includes a dust collecting motor 534, a rotating plate 531, a first electrode plate 532 and a second electrode plate 533. The dust collecting motor 534 is installed on the sieve tube 51. The end of the sieve tube 51 away from the separation tube 41 is provided with a mounting groove 511. A rotating shaft 5311 is fixed on the rotating plate 531. The rotating plate 531 is rotatably arranged in the mounting groove 511 through the rotating shaft 5311. The end of the rotating shaft 5311 away from the rotating plate 531 is fixedly connected to the output end of the dust collecting motor 534. The first electrode plate 532 is fixed on the inner wall of the sieve tube 51, and the first electrode plate 532 is electrically connected to the positive electrode of the high-voltage power supply 54. The second electrode plate 533 is fixed on the rotating plate 531, and the second electrode plate 533 is electrically connected to the negative electrode of the high-voltage power supply 54. Two groups of second electrode plates 533 are arranged on the rotating plate 531, and the two groups of second electrode plates 533 are symmetrically arranged along the thickness direction of the rotating plate 531. The rotating plate 531 and the first electrode plate 532 are symmetrically arranged along the width direction of the sieve tube 51.

[0073] A plurality of dust collecting members 55 are arranged on the screening tube 51, and the plurality of dust collecting members 55 are arranged at equal intervals along the length direction of the rotating plate 531. The dust collecting members 55 include a reduction motor 551, a sliding screw 552, a guide rod 553, a sliding seat 554, a dust hopper 555, an air pump 556, a dust collecting box 557 and an isolation cover. A mounting seat 512 is fixedly provided on the outer wall of the screening tube 51. The mounting seat 512 is provided with a plurality of groups, and the plurality of mounting seats 512 are symmetrically arranged along the width direction of the mounting groove 511. The number of mounting seats 512 is determined according to the specific dust collecting members 55. In the present embodiment, the dust collecting members 55 are arranged in three groups, so the mounting seats 512 are provided with six groups. The reduction motor 551 is fixedly provided on the mounting seat 512, the sliding screw 552 is rotatably provided on the mounting seat 512, the guide rod 553 is fixedly provided on the mounting seat 512, and the guide rod 553 is arranged parallel to the sliding screw 552. The sliding screw 552 and the guide rod 553 are mounted on the mounting groove 511 through the mounting seat 512. One end of the sliding screw 552 is fixedly connected to the output end of the reduction motor 551. The sliding seat 554 is slidably arranged on the guide rod 553, and the sliding seat 554 is threadedly connected to the sliding screw 552. A hinge seat 5541 is fixedly arranged on the side of the sliding seat 554 facing the rotating plate 531. A connecting portion 5551 is fixedly arranged on the dust hopper 555. The connecting portion 5551 is rotatably connected to the hinged seat 5541, and the dust hopper 555 is rotatably set on the sliding seat 554 through the connecting part 5551. A scraper 558 is fixed on the dust suction port of the dust hopper 555, and the scraper 558 can abut against the second electrode plate 533. The vacuum pump 556 and the dust box 557 are both fixed on the mounting seat 512, and the air inlet end of the vacuum pump 556 is connected to the dust hopper 555, and the air outlet end of the vacuum pump 556 is connected to the dust box 557.

[0074] The isolation cover is configured as a rectangular box body with one side open. The isolation cover is disposed on the mounting groove 511. The isolation cover covers all dust collecting components 55 connected to the mounting groove 511. An inspection port is disposed on the isolation cover.

[0075] The hot air flow discharged from the separation tube 41 is injected from one end of the screening tube 51. The hot air flow will first pass through the impurity removal net 56. The barium oxide coated on the impurity removal net 56 can further remove hydrogen chloride and water that may be mixed in the hot air flow. The main reason for setting the barium oxide is that since the hot air flow is heated to above 300°C, the barium oxide will produce thermal electron emission in a high temperature environment and emit free electrons to the surroundings, so as to realize the early electrification of the iron oxide particles in the hot air flow, ensuring that the iron oxide can be fully electrically adsorbed on the second electrode plate 533; then the hot air flow will pass through the corona zone generated by the corona element 52, so that the iron oxide particles are fully charged, and finally the hot air flow is discharged from the end of the screening tube 51 away from the separation tube 41.

[0076] Reference Figure 1In the embodiment of the present application, the cooling recovery component 6 includes a placement rack 61, a condenser 63, a review piece 64 and a liquid storage box 62. The placement rack 61 is fixedly provided on the bottom plate 111, and the placement rack 61 is located on one side of the mounting rack 112. The condenser 63 is arranged in a spiral shape, and one end of the condenser 63 is connected to one end of the separation tube 41 having an air inlet 411, and the other end of the condenser 63 is connected to the liquid storage box 62. The condenser 63 is fixedly provided on the placement rack 61, and a plurality of groups of cooling fins are fixedly provided on the placement rack 61, and the cooling fins are connected to the outer wall of the condenser 63.

[0077] Reference Fig. 9 The review part 64 includes a reel 641, a reel 642, a test paper 643 and a color sensor 644. The reel 641 and the reel 642 are both rotatably arranged at one end of the condenser 63 close to the separation tube 41. The reel 641 and the reel 642 are distributed in a circle on the condenser 63. Two ends of the test paper 643 are respectively wound around the reel 641 and the reel 642, and the test paper 643 is slidably penetrated on the condenser 63. The test paper 643 and the condenser 63 are sealed. The test paper 643 and the axis of the separation tube 41 are inclined. The test paper 643 is evenly coated with potassium thiocyanate solution. A visual window is opened at one end of the condenser 63 close to the separation tube 41. The color sensor 644 is mounted above the visual window. The color sensor 644 is directly opposite to the test paper 643. The color sensor 644 is electrically connected to the controller 2.

[0078] Reference Figure 1 The liquid storage box 62 is arranged below the placement rack 61, and the liquid storage box 62 is fixed on the bottom plate 111. A liquid discharge pipe and a liquid injection pipe are fixed on the liquid storage box 62. The liquid storage box 62 is connected with the waste liquid tank 13 through the liquid injection pipe. A second solenoid valve is arranged on the liquid injection pipe, and the second solenoid valve is arranged as a one-way valve. The second solenoid valve is electrically connected to the controller 2, and a third solenoid valve is arranged on the liquid discharge pipe.

[0079] The implementation principle of the flue gas purification device for spray roasting hydrochloric acid regeneration in the embodiment of the present application is: the flue gas washed by the spray tower 1 is used to drive the power fan 31 to rotate, and the power fan 31 drives the piston plate 324 to slide back and forth in the box body 321, and the flue gas in the shell 11 is sucked and pressurized and injected into the separation tube 41. The flue gas will be centrifugally separated into two cold and hot air flows in the separation tube 41. At the same time, the iron oxide, hydrogen chloride and water vapor in the flue gas will also be separated one by one, and the iron oxide particles will be carried away by the hot air flow, and the hydrogen chloride and water vapor will also be carried away by the cold air flow. The hot air flow is injected into the screening tube 51, and the iron oxide will be recovered according to different particle size partitions, and the hydrogen chloride and water will be recovered by the condenser 63 and injected into the liquid storage tank 62.

[0080] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flue gas purification device for spray roasting hydrochloric acid regeneration, characterized in that: include: A spray tower (1), the spray tower (1) comprising a shell (11) and a spray element (12), a bottom plate (111) being fixedly provided at the bottom end of the shell (11), a mounting frame (112) being fixedly provided on the bottom plate (111), the mounting frame (112) being located on one side of the shell (11), a controller (2) being provided on the mounting frame (112), an exhaust pipe (114) for exhausting smoke being provided on the shell (11), the spray element (12) being provided in the shell (11), a first solenoid valve (121) being provided on the spray element (12), the first solenoid valve (121) being electrically connected to the controller (2); A separation component (4), the separation component (4) comprising a separation tube (41), an air intake pipe (42) and a flow block (43), the separation tube (41) being fixedly mounted on the mounting frame (112), an air intake hole (411) being formed at one end of the separation tube (41), the axis of the air intake hole (411) being tangent to an inner wall of the separation tube (41), one end of the air intake pipe (42) being in communication with the air intake hole (411), the other end of the air intake pipe (42) being in communication with an end of the exhaust pipe (114) away from the housing (11), a connection seat (412) being fixedly mounted on the inner wall of the separation tube (41), the connection seat (412) being located at an end of the separation tube (41) away from the air intake hole (411). The baffle (43) is arranged at one end of the separation tube (41), the baffle block (43) is arranged in a pointed cone shape, the baffle block (43) is fixedly arranged on the connection seat (412), when the exhaust pipe (114) injects smoke into the separation tube (41), a high-speed rotating smoke vortex is formed in the separation tube (41), the smoke is separated in the separation tube (41) into two streams of cold and hot air, and the baffle block (43) blocks the cold air flow from being discharged from the end of the separation tube (41) provided with the connection seat (412), thereby allowing the hot air flow to be discharged from the end of the separation tube (41) provided with the connection seat (412), the hot air flow entrains heavier iron oxide particles, and the cold air flow entrains lighter hydrogen chloride and water vapor.

2. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 1, characterized in that: The invention also comprises a power assembly (3), wherein the power assembly (3) comprises a power fan (31) and an air extraction member (32), wherein a rotating shaft (311) is fixedly provided on the power fan (31), and the power fan (31) is rotatably arranged in the housing (11) via the rotating shaft (311), wherein the power fan (31) is located at an end of the housing (11) where the exhaust pipe (114) is arranged, and the air extraction member (32) is arranged at an end of the exhaust pipe (114) away from the housing (11), and an input end and an output end are arranged on the air extraction member (32), wherein the power fan (31) is located at an end of the housing (11) where the exhaust pipe (114) is arranged. The exhaust pipe (114) is connected to the input end of the exhaust member (32), and the power fan (31) can act on the exhaust member (32). When the smoke in the shell (11) is discharged from the exhaust pipe (114), the smoke after spraying and washing will push the power fan (31) to rotate. The power fan (31) can drive the exhaust member (32) to continuously suck the smoke in the shell (11). The smoke in the shell (11) will enter from the input end of the exhaust member (32) and be discharged from the output end of the exhaust member (32) after being pressurized.

3. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 2, characterized in that: The air extraction member (32) comprises a box body (321), a cover plate (322), a blocking plate (323) and a piston plate (324); a support frame (115) is fixedly provided on the bottom plate (111); the box body (321) is fixedly provided on the support frame (115); a partition plate (325) is fixedly provided inside the box body (321); the partition plate (325) divides the box body (321) into two chambers, the two chambers being respectively configured as a compression chamber (329) and an air outlet chamber (330); an air inlet groove (3251) is provided at one end in the length direction of the partition plate (325); the compression chamber (329) is connected to the air outlet chamber (330) via the air inlet groove (3251); An air inlet (3211) is provided through the inner wall of the compression chamber (329), the air inlet (3211) is located above the air inlet groove (3251), the compression chamber (329) is connected to the exhaust pipe (114) through the air inlet (3211), the cover plate (322) rotates on the inner wall of the compression chamber (329), the cover plate (322) can block the air inlet (3211), the air inlet groove (3251), the air inlet (3211) and the cover plate (322) are each provided with two groups, and the two groups of the air inlet groove (3251), the air inlet (3211) and the cover plate (322) are symmetrically arranged along the length direction of the box body (321); An exhaust port (3212) is provided on the inner wall of the air outlet chamber (330), and a connecting pipe (326) is provided on the exhaust port (3212). One end of the connecting pipe (326) away from the box body (321) is in communication with the air inlet pipe (42). A partition block (327) is fixedly provided in the air outlet chamber (330), and the partition block (327) divides the air outlet chamber (330) into two chambers, which are respectively provided as a first air outlet chamber (3301) and a second air outlet chamber ( 3302), a first connecting hole (3303) is opened on the inner wall of the first gas outlet chamber (3301), the first connecting hole (3303) is connected to the exhaust port (3212), a second connecting hole (3304) is opened on the inner wall of the second gas outlet chamber (3302), the second connecting hole (3304) is connected to the exhaust port (3212), the blocking plate (323) is rotatably arranged between the first connecting hole (3303) and the second connecting hole (3304), The blocking plate (323) can selectively block the first connecting hole (3303) and the second connecting hole (3304); the piston plate (324) is slidably disposed in the compression chamber (329); a piston rod (3241) is fixedly disposed on the piston plate (324); an end of the piston rod (3241) away from the piston plate (324) is slidably disposed on the box body (321); and a transmission element is disposed on the end of the piston rod (3241) away from the piston plate (324). The piston rod (3241) is connected to the rotating shaft (311) through the transmission member (328); when the smoke in the shell (11) drives the power fan (31) to rotate, the transmission member (328) can drive the piston plate (324) to slide back and forth in the compression chamber (329), so that the box (321) continuously draws the smoke in the shell (11) and injects the smoke into the separation pipe (41) for separation.

4. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 2, characterized in that: The blade of the power fan (31) is provided with a receiving groove (312), an extension portion (33) is slidably arranged in the receiving groove (312), an elastic member (34) and a distance sensor (35) are arranged in the receiving groove (312), the elastic member (34) is made of a phase change material, one end of the elastic member (34) is fixedly connected to the inner wall of the receiving groove (312), the other end of the elastic member (34) is fixedly connected to the extension portion (33), and the distance sensor (35) is fixedly arranged in the receiving groove (312). 12), the distance sensor (35) can detect the extension amount of the extension part (33) into the accommodating groove (312), the distance sensor (35) is electrically connected to the controller (2), the elastic member (34) can act on the extension part (33), the elastic member (34) will shrink as the smoke temperature increases, thereby reducing the fan blade area of ​​the power fan (31), and further enabling the controller (2) to control the first solenoid valve (121) to increase the spraying amount of the spraying member (12).

5. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 1, characterized in that: The separation assembly (4) further comprises an auxiliary heating element (44), the auxiliary heating element (44) comprising a transmission turbofan (441), a rotating sleeve (442) and a permanent magnet (443); the separation tube (41) is made of stainless steel; the transmission turbofan (441) is rotatably arranged on a side of the connection seat (412) away from the baffle block (43); a mounting frame (444) is fixedly arranged on the outer peripheral side of the transmission turbofan (441); the mounting frame (444) is slidably connected to the inner wall of the separation tube (41); the mounting frame (444) A plurality of groups of magnetic blocks (445) are fixedly arranged on the separation tube (41); the rotating sleeve (442) is rotatably sleeved on the separation tube (41); the permanent magnet (443) is fixedly embedded on the inner wall of the rotating sleeve (442); the permanent magnet (443) and the magnetic blocks (445) can attract each other; when the hot air flow in the separation tube (41) drives the transmission turbofan (441) to rotate, the transmission turbofan (441) drives the rotating sleeve (442) to rotate on the separation tube (41), thereby heating the separation tube (41).

6. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 3, characterized in that: The transmission member (328) comprises a transmission crankshaft (3281) and a transmission rod (3282); the transmission crankshaft (3281) is arranged at one end of the rotating shaft (311) close to the housing (321); one end of the transmission crankshaft (3281) is rotatably connected to the support frame (115); the other end of the transmission crankshaft (3281) is fixedly connected to one end of the rotating shaft (311) close to the housing (321); the transmission rod (3282) is arranged on the transmission crankshaft (3281); and the transmission rod (3281) is connected to the rotating shaft (311) and the housing (321) is connected to the transmission crankshaft (3281). One end of the transmission rod (3282) is rotationally connected to the transmission crankshaft (3281), and one end of the transmission rod (3282) is rotationally connected to an end of the piston rod (3241) away from the piston plate (324). When the smoke in the housing (11) drives the power fan (31) to rotate, the rotating shaft (311) drives the transmission crankshaft (3281) to rotate, and the transmission crankshaft (3281) drives the piston plate (324) to slide back and forth in the compression chamber (329) through the transmission rod (3282).

7. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 1, characterized in that: The device further comprises a screening component (5), the screening component (5) comprising a screening tube (51), a corona element (52) and a dust collecting element (53), the screening tube (51) being fixedly mounted on the mounting frame (112), one end of the screening tube (51) being connected to one end of the separation tube (41) provided with the connecting seat (412), a high voltage power supply (54) being arranged on the mounting frame (112), the corona element (52) being arranged in the screening tube (51), the corona element (52) being electrically connected to the negative electrode of the high voltage power supply (54), the corona element (52) being capable of generating a negative electrode corona zone in the screening tube (51), and when the hot air flow discharged from the separation tube (41) passes through the negative electrode corona zone, the iron oxide particles in the hot air flow are charged with a negative electrode; The dust collecting member (53) comprises a rotating plate (531), a first electrode plate (532) and a second electrode plate (533); a mounting groove (511) is provided through one end of the sieve tube (51) away from the separation tube (41); a rotating shaft (5311) is fixedly provided on the rotating plate (531); the rotating plate (531) is rotatably arranged in the mounting groove (511) via the rotating shaft (5311); the first electrode plate (532) is fixedly arranged on the inner wall of the sieve tube (51); the first electrode plate (532) is electrically connected to the positive electrode of the high-voltage power supply (54); the second electrode plate (533) is fixedly arranged on the rotating plate (531); the second electrode plate (533) is electrically connected to the negative electrode of the high-voltage power supply (54); the rotating plate (531) and the first electrode plate (532) are symmetrically arranged along the width direction of the sieve tube (51).

8. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 7, characterized in that: The screening assembly (5) further comprises a dust collecting member (55), the dust collecting member (55) comprising a reduction motor (551), a sliding screw (552), a guide rod (553), a sliding seat (554), a dust hopper (555), an air pump (556) and a dust collecting box (557); a mounting seat (512) is fixedly provided on the outer side wall of the screening tube (51); the reduction motor (551) is fixedly provided on the mounting seat (512); the sliding screw (554) is fixedly provided on the mounting seat (512); The guide rod (553) is rotatably connected to the mounting seat (512), the sliding screw rod (552) is mounted on the mounting groove (511) through the mounting seat (512), one end of the sliding screw rod (552) is fixedly connected to the output end of the reduction motor (551), the guide rod (553) is fixedly mounted on the mounting groove (511) through the mounting seat (512), and the guide rod (553) is arranged parallel to the sliding screw rod (552). The sliding seat (554) is slidably arranged on the guide rod (553), and the sliding seat (554) is threadedly connected to the sliding screw rod (552). A hinge seat (5541) is fixedly provided on the sliding seat (554), and a connecting portion (5551) is fixedly provided on the dust hopper (555). The connecting portion (5551) is rotatably connected to the hinge seat (5541), and the dust hopper (555) is rotatably connected to the hinge seat (5541). The dust collecting hopper (555) is arranged on the sliding seat (554), and a scraper (558) is fixed on the dust collecting hopper (555), and the scraper (558) can abut against the second electrode plate (533). The air pump (556) and the dust collecting box (557) are both fixed on the mounting seat (512), and the air inlet end of the air pump (556) is connected to the dust collecting hopper (555), and the air outlet end of the air pump (556) is connected to the dust collecting box (557).

9. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 1, characterized in that: It also includes a cooling recovery component (6), the cooling recovery component (6) includes a placement rack (61), a liquid storage box (62) and a condenser (63), the placement rack (61) is fixed on the bottom plate (111), the liquid storage box (62) is arranged below the placement rack (61), the condenser (63) is arranged in a spiral shape, the condenser (63) is fixed on the placement rack (61), the placement rack (61) is provided with a plurality of groups of cooling fins, the cooling fins are connected to the outer wall of the condenser (63), one end of the condenser (63) is connected to one end of the separation tube (41) provided with the air inlet (411), and the other end of the condenser (63) is connected to the liquid storage box (62).

10. A flue gas purification device for spray roasting hydrochloric acid regeneration according to claim 9, characterized in that: The condenser tube (63) is provided with a check piece (64), the check piece (64) comprising a reel-out drum (641), a reel-up drum (642), a test paper (643) and a color sensor (644), the reel-out drum (641) and the reel-up drum (642) being both rotatably arranged at one end of the condenser tube (63) close to the separation tube (41), the reel-out drum (641) and the reel-up drum (642) being distributed in a circular pattern on the condenser tube (63), the two ends of the test paper (643) being respectively wound around the reel-out drum (641) and the reel-up drum (642), and the test paper (643) being slidably inserted through the condenser tube ( 63), the test paper (643) and the condenser (63) are sealed, the test paper (643) and the axis of one end of the separation tube (41) are inclined, the test paper (643) is evenly coated with potassium thiocyanate solution, when iron oxide particles are mixed in the cold air flow, the iron oxide will make the test paper (643) turn red, the condenser (63) is provided with a visual window at one end close to the separation tube (41), the color sensor (644) is mounted above the visual window, the color sensor (644) is directly opposite to the test paper (643), and the color sensor (644) is electrically connected to the controller (2).

Images