Zinc oxide kiln with energy saving and self-cleaning flue

Abstract

The application discloses a kind of energy-saving self-cleaning flue zinc oxide kiln, belong to zinc oxide kiln field;Including temperature box, kiln body, exhaust pipe, exhaust pipe is equipped with protective tube, protective tube is equipped with purification mechanism, purification mechanism includes purification cylinder and with exhaust pipe fixed communication U-shaped gas duct, purification cylinder stores purification liquid, its liquid level height is lower than U-shaped gas duct top height;The top of purification cylinder is equipped with the scraping mechanism used in cooperation with U-shaped gas duct;When using, the kiln flue gas is introduced into the top sealed expansion cone bucket with exhaust pipe and U-shaped gas duct, the internal fan is rotated using its kinetic energy, and then the annular scraper is driven by the rotating rod to continuously scrape the inner wall of the spherical purification cylinder. This process prevents the clogging of dirt while ensuring the cleanliness of the gas-liquid reaction surface and the unobstructed passage, effectively avoiding downtime cleaning due to fouling, significantly improving the purification efficiency and reducing maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of zinc oxide kiln technology, and more specifically, to a zinc oxide kiln with an energy-saving and self-cleaning flue. Background Technology

[0002] Zinc oxide furnaces are key equipment in the pyrometallurgical production of zinc oxide. The high-temperature flue gas generated during calcination and reduction processes must first be cooled before being introduced into purification equipment for deep treatment to remove harmful gases and residual dust, ensuring that the final emissions meet environmental standards. Currently, the commonly used flue gas purification method in the industry is to pass the pre-cooled flue gas into a reaction tank containing a specific reaction liquid. Through gas-liquid contact, the acidic and harmful components in the flue gas are neutralized and absorbed, while some metal compounds and dust are also trapped in the liquid phase.

[0003] However, during the purification reaction, the insoluble salts, trapped solid particles, and other byproducts generated by the reaction are very likely to deposit, scale, and gradually harden on the inner wall of the purification cylinder, internal components, and reaction liquid surface. These continuously accumulating hard dirt will occupy the effective volume and block the internal channels. In severe cases, it will not only greatly reduce the purification efficiency, but also lead to increased system pressure loss and energy consumption, ultimately forcing the production line to stop for manual cleaning. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide an energy-saving and self-cleaning zinc oxide kiln with a flue, which aims to solve the above-mentioned technical problems.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A zinc oxide kiln with an energy-saving self-cleaning flue includes an insulated box, the interior of which is fixedly connected to a kiln body. A burner is located at one end of the kiln body. An exhaust pipe is connected to one side of the insulated box, and a protective pipe is fitted over the exhaust pipe. A purification mechanism is located inside the protective pipe. The purification mechanism includes a purification cylinder fixed within the protective pipe. A U-shaped air guide pipe, fixedly connected to the exhaust pipe, is located in the middle of the purification cylinder. The purification cylinder stores a purification liquid, the liquid level of which is lower than the top height of the U-shaped air guide pipe. An exhaust port is located at the top of the purification cylinder, and a discharge pipe with an electric valve is located at the bottom.

[0007] The top of the purification cylinder is equipped with a scraping mechanism that works in conjunction with a U-shaped air guide tube. The scraping mechanism includes an expanding cone that connects to the top outlet of the U-shaped air guide tube. A support base is fixedly connected to the bottom of the expanding cone. A rotating rod is rotatably connected inside the support base. A limit block is fixedly connected to the outer circular surface of the rotating rod. A fan is fixedly connected to the middle of the outer circular surface of the rotating rod. The fan is connected to an annular scraper located on the inner wall of the purification cylinder through the rotating rod. When the fan rotates, it drives the annular scraper to scrape the inner wall of the purification cylinder.

[0008] As a further aspect of the present invention: the bottom of the annular scraper is provided with a limiting sleeve that is sleeved with the exhaust pipe; a feed hopper is provided at the upper end of one side of the kiln body; a pressure metering pump is provided above the burner; an L-shaped bracket for lifting the kiln body is provided on one side of the outer surface of the insulation box, and the protective pipe is fixedly connected to the other side by a fixing block.

[0009] As a further aspect of the present invention: the purification cylinder is a hollow sphere, with a conical hopper fixedly connected to its top; the recess of the U-shaped gas guide pipe is connected to the exhaust pipe; a liquid storage tank is fixedly installed on the top of the insulation box, and a filling pipe connected to the inside of the purification cylinder is provided on one side of the liquid storage tank, so that new reaction liquid can be replenished to the purification cylinder in a timely manner through the filling pipe.

[0010] As a further aspect of the present invention: the inner walls of the purification cylinder, the U-shaped air guide pipe, and the expansion cone are all coated with a polytetrafluoroethylene coating, and the surface of the fan is also coated with a polytetrafluoroethylene coating.

[0011] As a further aspect of the present invention: an elastic scraper is fixed to the outer edge of the annular scraper, and the elastic scraper is in interference contact with the inner wall of the purification cylinder; the exhaust port of the purification cylinder is connected to an external induced draft fan through a pipeline, and the induced draft fan is used in conjunction with a pressure metering pump to detect the internal pressure signal of the kiln.

[0012] As a further embodiment of the present invention: a guide channel is provided at the bottom of the inner side of the protective tube, and a recycling mechanism is provided on the outer side of the protective tube to cooperate with the guide channel. The recycling mechanism includes a receiving cover connected to the guide channel and a collection cylinder threadedly connected to the receiving cover. A connecting plate fixedly connected to the heat preservation box is provided on the rear side of the collection cylinder. A screening component for separating waste liquid is provided inside the receiving cover.

[0013] As a further aspect of the present invention: the screening component includes a semi-circular filter screen fixedly connected to one side of the inner wall of the receiving cover, and a first partition plate fixedly connected to the bottom of the filter screen; a servo motor is fixedly installed at the middle of the top of the receiving cover, and a cleaning plate is fixedly connected through the output shaft of the servo motor inside the receiving cover; a second partition plate is fixedly connected to the middle of the inside of the collecting cylinder, and a concentration detector is provided on one side of the bottom.

[0014] As a further aspect of the present invention: the collecting cylinder divides its internal cavity into two parts by a second partition, the cavity located on one side of the second partition and directly below the filter screen is the wastewater recovery cavity, while the other side is the impurity recovery cavity; the measuring end of the concentration detector is located at the bottom of the wastewater recovery cavity.

[0015] As a further aspect of the present invention: a spraying mechanism is provided at the inner top of the protective pipe, the spraying mechanism including an annular conduit located at the inner top of the protective pipe, and fixing plates fixedly connected to the protective pipe on both sides of the outer surface of the annular conduit; an atomizing spray pipe is arranged around the inner side of the annular conduit, and the atomizing spray pipe is fixedly connected to the annular conduit; a conveying assembly for providing secondary spraying reaction liquid to the annular conduit is provided at the rear side of the collecting cylinder for further purification of the emitted flue gas.

[0016] As a further aspect of the present invention: the conveying assembly includes a water pump located at the rear of the collecting cylinder, and a support frame for supporting the water pump is fixedly connected to one side of the upper surface of the connecting plate; one end of the water pump is provided with a water pumping pipe fixedly connected to the collecting cylinder, and the other end is provided with a conveying pipe fixedly connected to the annular conduit.

[0017] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects:

[0018] (1) By setting up a purification mechanism and a scraping mechanism, the flue gas in the kiln is introduced into the top sealed expansion cone through the exhaust pipe and U-shaped air guide pipe during use. The kinetic energy of the cone drives the internal fan to rotate, and then drives the annular scraper to continuously scrape the inner wall of the spherical purification cylinder through the rotating rod. This process does not require external power. While preventing dirt from accumulating and clogging, it ensures the cleanliness of the gas-liquid reaction surface and the unobstructed passage, thereby effectively avoiding downtime for cleaning due to scaling. It significantly improves the continuity of equipment operation, purification efficiency and reduces maintenance costs.

[0019] (2) By setting up a guide channel, a recovery mechanism and a collection component, the waste liquid generated during the process of treating flue gas with the reaction liquid is introduced into the recovery mechanism through the guide channel. First, solid impurities are intercepted by a semi-circular filter screen, and the cleaning plate driven by the servo motor automatically scrapes the filter screen to prevent clogging. The removed impurities are guided by the first partition to fall into the "impurity recovery chamber" of the collection cylinder, while the filtrate enters its "wastewater recovery chamber". The two chambers are strictly separated by the second partition, thereby realizing the complete separation of solids and liquids in the waste liquid, which is convenient for subsequent classification treatment or resource recycling.

[0020] (3) By setting up a spraying mechanism, the wastewater treated by the recycling mechanism is pumped into the ring pipe by a water pump and sprayed out in the form of fine droplets through the atomizing spray pipe. It comes into full contact with the rising flue gas to further remove residual pollutants. The dripping liquid is returned to the system for reprocessing, forming a closed loop. This process not only significantly improves the cleanliness of the discharge through secondary purification, but also realizes the efficient reuse of wastewater and residual reagents, achieving water saving and improving reagent utilization. Attached Figure Description

[0021] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram showing the connection between the recycling mechanism and the spraying mechanism of the present invention;

[0024] Figure 3 This is an internal cross-sectional view of the protective tube of the present invention;

[0025] Figure 4 This is a schematic diagram showing the connection between the purification mechanism and the scraping mechanism of the present invention;

[0026] Figure 5 This is a schematic diagram of the recycling mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the spray mechanism of the present invention.

[0028] Figure label:

[0029] 1. Insulated box; 2. Kiln body; 3. Feed hopper; 4. Burner; 5. Pressure metering pump;

[0030] 6. Exhaust pipe; 7. Fixing block; 8. Protective pipe;

[0031] 9. Purification mechanism; 91. Purification cylinder; 92. Liquid filling pipe; 93. Electric valve; 94. U-shaped air guide pipe; 95. Conical hopper;

[0032] 10. Scraping mechanism; 101. Expanding cone hopper; 102. Support base; 103. Rotating rod; 104. Fan; 105. Limiting block; 106. Annular scraper; 107. Limiting sleeve;

[0033] 11. Liquid storage tank; 12. Flow guide channel;

[0034] 13. Recycling mechanism; 131. Receiving cover; 132. Filter screen; 133. First partition; 134. Servo motor; 135. Cleaning plate; 136. Collection cylinder; 137. Second partition; 138. Connecting plate;

[0035] 14. Concentration detector;

[0036] 15. Spraying mechanism; 151. Water pump; 152. Water pumping pipe; 153. Delivery pipe; 154. Circular guide pipe; 155. Fixing plate; 156. Atomizing spray pipe.

[0037] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0038] The present invention provides a zinc oxide kiln with an energy-saving self-cleaning flue, described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0039] like Figures 1 to 6 As shown, this embodiment of the invention provides an energy-saving self-cleaning zinc oxide kiln, including an insulated box 1, a kiln body 2 fixedly connected inside the insulated box 1, a burner 4 provided at one end of the kiln body 2; an exhaust pipe 6 connected to one side of the insulated box 1, and a protective pipe 8 provided outside the exhaust pipe 6; a purification mechanism 9 provided inside the protective pipe 8, the purification mechanism 9 including a purification cylinder 91 fixed inside the protective pipe 8, a U-shaped air guide pipe 94 fixedly connected to the exhaust pipe 6 in the middle of the interior of the purification cylinder 91; a purification liquid stored in the purification cylinder 91, the liquid level being lower than the top height inside the U-shaped air guide pipe 94; an exhaust port provided at the top of the purification cylinder 91, and a discharge pipe with an electric valve 93 provided at the bottom;

[0040] The top of the purification cylinder 91 is provided with a scraping mechanism 10 that works in conjunction with the U-shaped air duct 94. The scraping mechanism 10 includes an expansion cone 101 that connects to the top outlet of the U-shaped air duct 94. A support base 102 is fixedly connected to the bottom of the expansion cone 101. A rotating rod 103 is rotatably connected inside the support base 102. A limit block 105 is fixedly connected to the outer circular surface of the rotating rod 103. A fan 104 is fixedly connected to the middle of the outer circular surface of the rotating rod 103. The fan 104 is connected to an annular scraper 106 located on the inner wall of the purification cylinder 91 through the rotating rod 103. When the fan 104 rotates, it drives the annular scraper 106 to scrape the inner wall of the purification cylinder 91.

[0041] To address the problem in existing zinc oxide kiln flue gas purification equipment where reaction products easily deposit, scale, and clump on the inner wall of the purification cylinder 91, leading to equipment blockage, reduced purification efficiency, and the need for manual cleaning during shutdown, the above-mentioned technical solution is adopted. This solution mainly consists of a purification mechanism 9 and a scraping mechanism 10. When the flue gas generated by the kiln 2 enters the U-shaped guide pipe 94 through the exhaust pipe 6, the liquid level of the purification liquid stored in the purification cylinder 91 is always lower than the inner top wall of the U-shaped guide pipe 94, forming a reliable liquid seal. This ensures that the flue gas can pass through without backflow of liquid. The flue gas rises along the U-shaped guide pipe 94 and is concentrated at its top outlet, sprayed into the connected expansion cone 101. The expansion cone 101 is a top-sealed chamber containing a fan 104. The high-speed flue gas flow directly impacts the blades of the fan 104, driving its rotation. Since the fan 104 is fixed to the rotating rod 103, the rotational power of the fan 104 is transmitted through the rotating rod 103. The fluid is directly transferred to the annular scraper 106 located on the inner wall of the purification cylinder 91. During the rotation of the rotating rod 103, the limiting block 105 ensures that the rotating rod 103 will not detach from the support base 102. Driven by the rotating rod 103, the annular scraper 106 continuously rotates and scrapes along the spherical inner wall of the purification cylinder 91. This process removes hard dirt such as reaction byproducts and crystals adhering to the inner wall in real time, effectively preventing its continuous accumulation and hardening. The scraped-off dirt mixes into the purification liquid and can eventually be discharged from the bottom discharge pipe (controlled by the electric valve 93) with the waste liquid. Discharge; During the above operation, without introducing external power or interrupting the purification process, the flue gas drives the fan 104, which in turn drives the annular scraper 106 to rotate inside the purification cylinder 91, thereby achieving continuous and automatic scraping of the scaled area and fundamentally avoiding the blockage problem caused by the caking of dirt. At the same time, by maintaining the smoothness of the inner wall of the purification cylinder 91, an effective reaction surface area and unobstructed gas-liquid channels are ensured, so that the purification reaction can be carried out continuously and efficiently. This effectively avoids the need for manual cleaning due to severe scaling, greatly improves the continuity of equipment operation and production efficiency, and reduces maintenance costs.

[0042] like Figures 1 to 6As shown, the bottom of the annular scraper 106 is provided with a limiting sleeve 107 that is sleeved with the exhaust pipe 6; the upper end of one side of the kiln body 2 is provided with a feed hopper 3; a pressure metering pump 5 is provided above the burner 4; one side of the outer surface of the heat preservation box 1 is provided with an L-shaped bracket for lifting the kiln body 2, and the other side is fixedly connected to the protective pipe 8 through a fixing block 7.

[0043] like Figures 1 to 6 As shown, the purification cylinder 91 is a hollow sphere, and a conical hopper 95 is fixedly connected to its top; the recess of the U-shaped gas guide pipe 94 is connected to the exhaust pipe 6; a liquid storage tank 11 is fixedly installed on the top of the heat preservation box 1, and a liquid filling pipe 92 connected to the inside of the purification cylinder 91 is provided on one side of the liquid storage tank 11, so that new reaction liquid can be replenished to the purification cylinder 91 in a timely manner through the liquid filling pipe 92.

[0044] When zinc oxide material needs to be prepared, the feed hopper 3 is first connected to the external material conveying equipment, so that the material is added from the feed hopper 3. The smelting reaction is carried out at a high temperature provided by the burner 4 at one end of the kiln body 2. The flue gas generated by the reaction is monitored by the pressure metering pump 5 and collected in the insulation box 1 to the exhaust pipe 6. The entire kiln body 2 is stably supported by the L-shaped bracket, and the protective pipe 8 is firmly connected to the insulation box 1 by the fixing block 7 on the flue gas treatment side, forming a stable treatment channel. The flue gas first enters the U-shaped air guide pipe 94 from the exhaust pipe 6. Since the concave part of the U-shaped air guide pipe 94 is connected to the exhaust pipe 6, and the purification cylinder 91 is hollow spherical, the liquid level of the purification liquid stored in it is always lower than the highest point of the U-shaped air guide pipe 94. Thus, while achieving gas-liquid contact, the U-shaped air guide pipe 94 forms a reliable liquid seal, effectively preventing the purification liquid from flowing back into the upstream pipe. And since the outlet end of the exhaust pipe 6 is directly aligned with The lower end of the expansion cone 101 is open, so when the flue gas enters the U-shaped air guide pipe 94, a portion of the flue gas enters the expansion cone 101 and drives the fan 104 inside to rotate. The rotation of the fan 104 drives the annular scraper 106 through the rotating rod 103, causing it to rotate and scrape against the inner wall of the spherical purification cylinder 91. In order to ensure the stable concentric movement of the annular scraper 106 under high-speed rotation, a limiting sleeve 107 is provided that is sleeved with the exhaust pipe 6. Using the stationary exhaust pipe 6 as the central axis, a stable radial limit is provided for the rotating annular scraper 106 to prevent it from swaying, thereby ensuring the uniformity of scraping and the long-term reliable operation of the mechanism. In addition, to maintain the continuous purification capacity of the system, a liquid storage tank 11 is fixedly installed on the top of the heat preservation box 1. It is connected to the inside of the purification cylinder 91 through the liquid filling pipe 92, and can periodically or automatically replenish fresh purification reaction liquid into the cylinder to offset consumption and maintain the optimal liquid level and reaction concentration.

[0045] like Figures 1 to 6 As shown, the inner walls of the purification cylinder 91, the U-shaped air guide pipe 94, and the expansion cone 101 are all coated with polytetrafluoroethylene (PTFE), and the surface of the fan 104 is also coated with PTFE.

[0046] like Figures 1 to 6 As shown, an elastic scraper is fixed to the outer edge of the annular scraper 106, and the elastic scraper is in interference contact with the inner wall of the purification cylinder 91; the exhaust port of the purification cylinder 91 is connected to an external induced draft fan through a pipeline, and the induced draft fan is used in conjunction with the pressure metering pump 5 to detect the internal pressure signal of the kiln body 2.

[0047] During flue gas treatment, to prevent impurities from remaining inside the purification cylinder 91, a polytetrafluoroethylene (PTFE) coating is applied to the inner walls of the purification cylinder 91, the U-shaped air guide pipe 94, the expansion cone 101, and the surface of the fan 104. This coating utilizes its extremely low surface energy to prevent wet and sticky substances in the flue gas from wetting and adhering firmly, greatly reducing the load on mechanical scraping. Furthermore, an elastic scraper made of corrosion-resistant elastic material is fixedly installed on the outer edge of the annular scraper 106, engaging with the inner wall of the purification cylinder 91 in an interference fit to ensure continuous and uniform scraping, effectively removing loose dirt while avoiding damage to the underlying anti-stick coating. During flue gas emission, an external induced draft fan is connected to the exhaust port of the purification cylinder 91 at the system outlet. This induced draft fan is connected to the kiln body 2 under real-time monitoring. The internal pressure metering pump 5 is linked to a signal. When the pressure rises, indicating an increase in flue gas volume or increased resistance, the power is increased to ensure smooth emission; conversely, the power is reduced to save energy.

[0048] like Figures 1 to 6 As shown, the bottom of the inner side of the protective pipe 8 is provided with a guide channel 12, and the outer side of the protective pipe 8 is provided with a recycling mechanism 13 that works in conjunction with the guide channel 12. The recycling mechanism 13 includes a receiving cover 131 connected to the guide channel 12 and a collection cylinder 136 threadedly connected to the receiving cover 131. The rear side of the collection cylinder 136 is provided with a connecting plate 138 that is fixedly connected to the heat preservation box 1. The inside of the receiving cover 131 is provided with a screening component for separating and treating the waste liquid.

[0049] like Figures 1 to 6 As shown, the screening assembly includes a semi-circular filter screen 132 fixedly connected to one side of the inner wall of the receiving cover 131, and a first partition 133 fixedly connected to the bottom of the filter screen 132; a servo motor 134 is fixedly installed at the middle of the top of the receiving cover 131, and a cleaning plate 135 is fixedly connected through the inside of the receiving cover 131; a second partition 137 is fixedly connected at the middle of the inside of the collection cylinder 136, and a concentration detector 14 is provided on one side of the bottom.

[0050] like Figures 1 to 6As shown, the collection cylinder 136 divides its internal cavity into two parts by the second partition 137. The cavity located on one side of the second partition 137 and directly below the filter screen 132 is the wastewater recovery cavity, while the other side is the impurity recovery cavity. The measuring end of the concentration detector 14 is located at the bottom of the wastewater recovery cavity.

[0051] To address the issues of direct mixing and discharge of wastewater from existing zinc oxide kiln purification systems, which leads to difficulties in separating solid impurities from wastewater, high subsequent treatment costs, and frequent clogging and cleaning of wastewater collection devices, a new system is designed. When the reaction wastewater in the purification cylinder 91 is discharged through the bottom discharge pipe, it first flows into the guide channel 12. The guide channel 12 then directs the wastewater into the connected recovery mechanism 13. Upon entering the recovery mechanism 13, the wastewater first reaches the semi-circular filter screen 132 inside the receiving cover 131. As the wastewater flows through this filter screen 132, larger solid particles, such as scraped-off scale debris and unreacted dust, are trapped upstream of the filter screen 132, while the preliminarily filtered liquid passes through the mesh. To prevent the filter screen 132 from being quickly clogged by impurities, a servo motor 134 is installed on the top of the receiving cover 131, whose output shaft drives the cleaning plate 135. The filter screen 132 is rotated periodically or continuously to scrape solid impurities accumulated on the liquid-facing side to one side, ensuring the continuous unobstructed flow of the filtration channel. Solid impurities pushed away by the cleaning plate 135 fall into a specific area within the collection cylinder 136 under the guidance of the first partition 133. The collection cylinder 136 is divided into two independent chambers by a second partition 137: a "wastewater recovery chamber" located directly below the filter screen 132 for collecting filtrate, and a "solid impurity recovery chamber" for collecting solids swept in by the cleaning plate 135. This operation achieves complete separation of solids and liquids in the wastewater, facilitating subsequent classification or resource recovery. Furthermore, to monitor wastewater quality, a concentration meter 14 is installed at the bottom of the wastewater recovery chamber to monitor the concentration of specific pollutants in the wastewater in real time, laying the foundation for subsequent secondary utilization. The entire recovery mechanism 13 is securely connected to the insulated box 1 via a connecting plate 138, while the collection cylinder 136 and the receiving cover 131... The components are connected by threads, and when the impurity recovery chamber is full or requires maintenance, the collection cylinder 136 can be easily unscrewed for cleaning or replacement.

[0052] like Figures 1 to 6 As shown, a spraying mechanism 15 is provided at the inner top of the protective pipe 8. The spraying mechanism 15 includes an annular conduit 154 located at the inner top of the protective pipe 8. Fixing plates 155, which are fixedly connected to the protective pipe 8, are provided on both sides of the outer surface of the annular conduit 154. An atomizing spray pipe 156 is arranged around the inner side of the annular conduit 154, and the atomizing spray pipe 156 is fixedly connected to the annular conduit 154. A conveying assembly for providing secondary spraying reaction liquid to the annular conduit 154 is provided at the rear side of the collection cylinder 136 to further purify the emitted flue gas.

[0053] like Figures 1 to 6 As shown, the conveying assembly includes a water pump 151 located behind the collection cylinder 136, and a support frame for supporting the water pump 151 is fixedly connected to one side of the upper surface of the connecting plate 138; one end of the water pump 151 is provided with a water pumping pipe 152 fixedly connected to the collection cylinder 136, and the other end is provided with a conveying pipe 153 fixedly connected to the annular conduit 154.

[0054] After the flue gas, initially treated by the purification cylinder 91, is discharged from its top exhaust port, it immediately enters the secondary purification zone formed by the inner wall of the protective pipe 8 and the spray mechanism 15. After the water pump 151 is started, it draws the wastewater, which has undergone preliminary sedimentation and monitoring, from the wastewater recovery chamber of the collection cylinder 136 through the water pump pipe 152. Subsequently, the water pump 151 transports the wastewater through the conveying pipe 153 to the annular conduit 154. The pressurized wastewater is distributed in the annular conduit 154 and finally sprayed out in atomized form from the nozzles of each atomizing spray pipe 156. Thus, when the rising flue gas passes through this atomized area composed of fine droplets, the residual acidic gases and fine dust carried in the flue gas collide, are absorbed, and neutralized by the chemically active droplets, thereby being further removed. The treated clean flue gas is finally discharged from the system, while the dripping waste liquid falls back into the guide trough 12 at the bottom of the protective pipe 8 and re-enters the recovery mechanism 13. Solid-liquid separation and monitoring are performed to complete a closed-loop process. For the above operations, a secondary purification system (spray mechanism 15) is added to further treat the flue gas after primary purification. The fine droplets generated by the atomizing spray pipe 156 greatly improve the gas-liquid mass transfer efficiency, effectively capturing and removing trace pollutants that were not completely treated in the primary purification, significantly improving the overall purification efficiency and the cleanliness of the emitted gas. Simultaneously, the wastewater treated by the recovery mechanism 13 is reused as a liquid source for secondary spraying via a water pump 151. This not only significantly reduces the consumption of fresh process water and achieves the recycling of water resources within the system, but also allows residual alkaline substances in the wastewater (such as unreacted alkali) to continue to play a purifying role, improving reagent utilization.

[0055] In use, this invention firstly involves feeding zinc oxide material into the feed hopper 3 during preparation. The material is then smelted at high temperature by the burner 4 within the kiln body 2. The resulting flue gas, monitored by the pressure metering pump 5, is collected in the insulation box 1 and directed to the exhaust pipe 6. The kiln body 2 is supported by an L-shaped bracket, and the protective pipe 8 is securely connected to the flue gas treatment side via a fixing block 7, forming a stable channel. Next, the flue gas enters the U-shaped gas guide pipe 94 inside the purification cylinder 91 from the exhaust pipe 6. Since the level of the purification liquid inside the purification cylinder 91 is always lower than the highest point of the U-shaped gas guide pipe 94, a reliable liquid seal is formed, preventing backflow. Therefore, when the flue gas is concentrated and sprayed into the top seal from the top outlet of the U-shaped gas guide pipe 94... When the expanding cone 101 is filled, it impacts the fan 104 inside and drives it to rotate. Since the fan 104 is fixed to the rotating rod 103, the rotational power of the fan 104 is transmitted to the annular scraper 106 through the rotating rod 103, causing it to continuously rotate and scrape against the spherical inner wall of the purification cylinder 91, removing the attached dirt in real time. The scraped dirt mixes with the purification liquid and is finally discharged by the bottom electric valve 93. During the cleaning of the inner wall of the purification cylinder 91, the limiting sleeve 107 is connected to the stationary exhaust pipe 6 to provide radial limit for the rotating annular scraper 106, ensuring its stable operation. In order to maintain the purification capacity, the storage tank 11 is filled with... The liquid pipe 92 periodically or regularly replenishes the purification cylinder 91 with fresh reaction liquid. Simultaneously, the waste liquid after reacting with the flue gas first flows into the guide groove 12 at the bottom of the protective pipe 8, then flows through the semi-circular filter screen 132 from the receiving cover 131, where solid impurities are trapped. To prevent clogging, the servo motor 134 is activated, driving the cleaning plate 135 to rotate on the upper surface of the filter screen 132, scraping the impurities to one side and guiding them through the first partition 133 into the impurity recovery chamber of the collection cylinder 136. The filtrate enters the wastewater recovery chamber of the collection cylinder 136. The two chambers are strictly separated by the second partition 137, achieving complete solid-liquid separation. During this process, the concentration... The detector 14 monitors the wastewater quality to provide a basis for subsequent treatment. Finally, the flue gas, which has been preliminarily treated by the purification cylinder 91, enters the secondary purification zone at the top of the protective pipe 8. At this time, the water pump 151 is started to draw wastewater from the wastewater recovery chamber of the collection cylinder 136 and pump it into the annular conduit 154 through the water pumping pipe 152 and the delivery pipe 153. The wastewater is atomized and sprayed out through the surrounding atomizing spray pipe 156, which fully contacts the rising flue gas to further remove residual pollutants. The dripping waste liquid returns to the guide trough 12 and re-enters the recycling mechanism 13, forming a closed loop of treatment. This process not only improves the cleanliness of the final emission gas, but also realizes the recycling of water and residual agents.

[0056] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A zinc oxide kiln with an energy-saving self-cleaning flue, comprising an insulated box (1), wherein a kiln body (2) is fixedly connected to the interior of the insulated box (1), and a burner (4) is provided on one end face of the kiln body (2); characterized in that, The heat preservation box (1) is connected to an exhaust pipe (6) on one side, and the exhaust pipe (6) is covered with a protective pipe (8); a purification mechanism (9) is provided inside the protective pipe (8), and the purification mechanism (9) includes a purification cylinder (91) fixed inside the protective pipe (8). A U-shaped air guide pipe (94) is provided in the middle of the interior of the purification cylinder (91) and is fixedly connected to the exhaust pipe (6); the purification cylinder (91) stores purification liquid, and its liquid level is lower than the height of the top of the U-shaped air guide pipe (94); the top of the purification cylinder (91) is provided with an exhaust port, and the bottom is provided with a discharge pipe with an electric valve (93); The top of the purification cylinder (91) is provided with a scraping mechanism (10) that works in conjunction with a U-shaped air guide tube (94). The scraping mechanism (10) includes an expansion cone (101) that connects to the top outlet of the U-shaped air guide tube (94). A support base (102) is fixedly connected to the bottom of the expansion cone (101). A rotating rod (103) is rotatably connected inside the support base (102). A limit block (105) is fixedly connected to the outer surface of the rotating rod (103). A fan (104) is fixedly connected to the middle of the outer surface of the rotating rod (103). The fan (104) is connected to an annular scraper located on the inner wall of the purification cylinder (91) via the rotating rod (103). 106), when the fan (104) rotates, it drives the annular scraper (106) to scrape the inner wall of the purification cylinder (91); the purification cylinder (91) is a hollow sphere, and a conical bucket (95) is fixedly connected to its top; the recess of the U-shaped air guide pipe (94) is connected to the exhaust pipe (6); a liquid storage tank (11) is fixedly installed on the top of the heat preservation box (1), and a filling pipe (92) connected to the inside of the purification cylinder (91) is provided on one side of the liquid storage tank (11), and new reaction liquid is replenished to the purification cylinder (91) in a timely manner through the filling pipe (92); an elastic scraper is fixed on the outer edge of the annular scraper (106), and the elastic scraper is in interference contact with the inner wall of the purification cylinder (91); The protective tube (8) has a guide channel (12) at its bottom. The protective tube (8) has a recycling mechanism (13) on its outer side that works in conjunction with the guide channel (12). The recycling mechanism (13) includes a receiving cover (131) connected to the guide channel (12) and a collection cylinder (136) threadedly connected to the receiving cover (131). The rear side of the collection cylinder (136) has a connecting plate (138) fixedly connected to the insulation box (1). The receiving cover (131) has a screening component inside for separating waste liquid. The screening component includes a semi-circular filter screen (132) fixedly connected to one side of the inner wall of the receiving cover (131). The bottom of the filter screen (132) is fixedly connected to a... The first partition (133); a servo motor (134) is fixedly installed at the middle of the top of the receiving cover (131), and the output shaft of the servo motor (134) passes through the inside of the receiving cover (131) and is fixedly connected to a cleaning plate (135); a second partition (137) is fixedly connected at the middle of the inside of the collecting cylinder (136), and a concentration detector (14) is provided on one side of the bottom; the collecting cylinder (136) divides the internal cavity into two parts through the second partition (137), the cavity located on one side of the second partition (137) and directly below the filter screen (132) is the wastewater recovery cavity, and the other side is the impurity recovery cavity; the measuring end of the concentration detector (14) is located at the bottom of the wastewater recovery cavity; The inner top of the protective tube (8) is provided with a spraying mechanism (15). The spraying mechanism (15) includes an annular conduit (154) located at the inner top of the protective tube (8). Both sides of the outer surface of the annular conduit (154) are provided with fixing plates (155) that are fixedly connected to the protective tube (8). The inner side of the annular conduit (154) is surrounded by an atomizing spray pipe (156), and the atomizing spray pipe (156) is fixedly connected to the annular conduit (154). The rear side of the collection cylinder (136) is provided with a conveying assembly that provides secondary spraying reaction liquid to the annular conduit (154) for further purification of the exhaust gas. The conveying assembly includes a water pump (151) located behind the collection cylinder (136), and a support frame for supporting the water pump (151) is fixedly connected to one side of the upper surface of the connecting plate (138); one end of the water pump (151) is provided with a water pumping pipe (152) fixedly connected to the collection cylinder (136), and the other end is provided with a conveying pipe (153) fixedly connected to the annular conduit (154).

2. The zinc oxide kiln with an energy-saving self-cleaning flue according to claim 1, characterized in that, The bottom of the annular scraper (106) is provided with a limiting sleeve (107) that is sleeved with the exhaust pipe (6); the upper end of one side of the kiln body (2) is provided with a feed hopper (3); a pressure metering pump (5) is provided above the burner (4); one side of the outer surface of the heat preservation box (1) is provided with an L-shaped bracket for lifting the kiln body (2), and the other side is fixedly connected to the protective pipe (8) by a fixing block (7).

3. A zinc oxide kiln with an energy-saving self-cleaning flue according to claim 2, characterized in that, The inner walls of the purification cylinder (91), the U-shaped air duct (94), and the expansion cone (101) are all coated with polytetrafluoroethylene (PTFE), and the surface of the fan (104) is also coated with PTFE.

4. A zinc oxide kiln with an energy-saving self-cleaning flue as described in claim 3, characterized in that, The exhaust port of the purification cylinder (91) is connected to an external induced draft fan through a pipeline. The induced draft fan is used in conjunction with the pressure metering pump (5) to detect the internal pressure signal of the kiln body (2).

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