An electrode paste production flue gas treatment system

Abstract

The application discloses a kind of electrode paste production flue gas treatment systems, belong to electrode paste production technical field, including purification device, the purification device includes shell and the water mist spray pipe placed in shell, the shell is by water mist spray pipe and is provided with multiple groups of purification section along the direction of air flow, the purification section is composed of purification area one, purification area two and purification area three, the purification area one and the purification area three are provided with the water mist spray pipe in spiral shape, and water mist spray head is installed obliquely towards inlet manifold at equal intervals on water mist spray pipe, the water mist spray pipe and water mist spray head connection place is equipped with activated carbon block, electrode collection component is equipped in the purification area two, the shell is equipped with cloth bag dust collector corresponding outlet manifold, activated carbon filter element pipe is connected between outlet manifold and fan;The application effectively solves the problem that the existing electrode paste flue gas treatment system has poor flue gas treatment effect, the overall use efficiency of activated carbon is low during use, and the replacement frequency is easily increased.

Description

Technical Field

[0001] This invention relates to the field of electrode paste production technology, specifically to an electrode paste production flue gas treatment system. Background Technology

[0002] Electrode paste is a conductive material supplied to electric furnace equipment such as ferroalloy furnaces and calcium carbide furnaces. Electrode paste is also known as self-baking electrode. The production process mainly involves calcining, crushing, screening, grinding, mixing, and molding of raw materials. The electrode paste is baked by the heat inside the submerged arc furnace. It has the characteristics of high temperature resistance, low coefficient of thermal expansion, low resistivity, which can reduce energy loss, low porosity, which can slow down the oxidation of the heated electrode, and high mechanical strength. Electrode paste production will generate some flue gas, which needs to be purified.

[0003] Existing electrode paste production flue gas treatment systems can treat the flue gas through the synergistic action of dust collectors, desulfurization equipment, denitrification equipment, and VOCs treatment equipment. However, these systems have a large footprint, high energy consumption, and high subsequent maintenance costs. To reduce the footprint and energy consumption, some electrode paste production flue gas treatment devices are integrated, using a combination of spraying and activated carbon to treat the flue gas within a single unit. However, during operation, the high-temperature flue gas experiences poor cooling within the unit, resulting in rapid flow and a short residence time, which hinders effective spraying purification. Furthermore, the flow of the flue gas affects the adsorption effect of the activated carbon, thus interfering with the flue gas's adsorption. Activated carbon with longer contact time adsorbs more pollutants, while activated carbon with shorter contact time with flue gas adsorbs less. Increasing the residence time of flue gas in the device improves the contact between activated carbon and flue gas. When the flue gas first comes into contact with the activated carbon at the head end, the flue gas contains more volatile organic compounds, particulate matter, and metal oxides, so the activated carbon adsorbs more impurities. However, when the activated carbon at the tail end is near the tail end, the flue gas contains fewer volatile organic compounds, particulate matter, and metal oxides, so the activated carbon adsorbs fewer impurities. This leads to inconsistent utilization of activated carbon in the purification device, resulting in lower activated carbon efficiency and increasing the frequency of activated carbon replacement.

[0004] Chinese patent CN117046285B discloses a flue gas pretreatment system for electrode paste production, comprising: a flue gas treatment cylinder with an air inlet on one side and an exhaust outlet at the upper end; a spraying mechanism for spraying and washing the gas entering the flue gas treatment cylinder; an opening and closing mechanism for sealing or conveying the sprayed flue gas inside the spraying mechanism; and a driving mechanism disposed between the spraying mechanism and the opening and closing mechanism for driving the opening and closing mechanism to move. Chinese patent CN218131030U discloses a flue gas purification system for electrode paste production, including a processing furnace. Spray heads with a mesh structure are distributed parallel to each other on the inner wall of the flue gas duct. Water pipes are provided on both sides of each spray head, with a water pump mounted on each pipe. A reagent tank is located at the other end of each water pipe. A waterproof and breathable membrane plate with a triangular protrusion structure is provided at the lower end of each spray head. Waste liquid collection tanks are provided on both sides of the waterproof and breathable membrane plate, with one side having an inclined opening. The spray head is connected to the reagent tank via the water pipes. However, existing flue gas treatment systems for electrode paste production have poor flue gas purification effects. Firstly, the contact time between the flue gas and the spray liquid is relatively short, making it difficult for the flue gas to fully mix and react with the spray liquid. Secondly, the high utilization rate of activated carbon on one side during use results in low overall efficiency and increases the frequency of activated carbon replacement. Therefore, this application needs to provide a flue gas treatment system for electrode paste production that offers both high flue gas purification effect and high activated carbon utilization efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the problems of poor flue gas purification effect and high single-sided utilization rate of activated carbon in existing electrode paste production flue gas treatment systems, which result in low overall utilization efficiency and increased frequency of activated carbon replacement. This invention provides an electrode paste production flue gas treatment system with high flue gas purification effect and high activated carbon utilization efficiency.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: An electrode paste production flue gas treatment system, comprising a purification device, one end of the purification device is connected to the chimney of the calcining furnace through a gas inlet main pipe, and the other end of the purification device is connected to a fan through a gas outlet main pipe; the purification device comprises a housing and water mist nozzles arranged inside the housing, a plurality of purification sections are arranged inside the housing along the gas flow direction via the water mist nozzles, the purification sections consist of a first purification zone, a second purification zone and a third purification zone, the first purification zone and the third purification zone are provided with spiral-shaped water mist nozzles, and water mist spray heads which are installed obliquely towards the gas inlet main pipe are arranged at equal intervals on the water mist nozzles, the connection part between the water mist nozzle and the water mist spray head is provided with an activated carbon block, the activated carbon block is parallel to the water mist nozzle and arranged perpendicular to the inner wall of the housing; an electrode collection member is arranged in the second purification zone, the electrode collection member consists of a high-voltage electrode and a ground electrode, which forms an electric field to perform deposition treatment on the flue gas treated by the first purification zone, the housing is provided with a bag-type dust collector corresponding to the gas outlet main pipe, and an activated carbon filter element pipe is connected between the gas outlet main pipe and the fan.

[0007] Further, the extension axis of the connection end between the water mist spray head and the water mist nozzle is arranged at an included angle of 15-30° with the housing, so that the flue gas can form a vortex under the action of the fan's extraction and diversion and the water mist sprayed from the water mist spray head.

[0008] Further, the activated carbon block has a length of 7-12cm, a width of 2-5cm, and a height of 10-15cm, the activated carbon block is provided with airflow patterns for enhancing contact with the airflow, and the airflow patterns are wavy and transversely arranged on the activated carbon block.

[0009] Further, the activated carbon block is further provided with a plurality of through holes, and the through holes are arranged in a "*" shape on the activated carbon block.

[0010] Further, a fixing net for fixing the high-voltage electrode is arranged in the second purification zone, the fixing net is made of copper wire material, wherein the fixing net is fixedly connected with the inner wall of the second purification zone, so that both ends of the high-voltage electrode are respectively and fixedly connected to the fixing net.

[0011] Further, the bag-type dust collector is composed of a plurality of activated carbon filter cartridges and filter bags, the activated carbon filter cartridges are arranged closely adjacent to the end of the third purification zone connected to the gas outlet main pipe, the filter bags are arranged on the side of the activated carbon filter cartridges opposite to the gas outlet main pipe, and a polytetrafluoroethylene filter membrane is arranged on the side of the activated carbon filter cartridges away from the gas outlet main pipe.

[0012] Further, an insulating high-temperature resistant layer is arranged inside the housing, liquid collection tanks are respectively arranged inside the housing corresponding to the first purification zone, the second purification zone and the third purification zone, and filter blocks are arranged on the liquid collection tanks, the filter blocks consist of a sponge filter layer and an activated carbon filter layer from top to bottom, and the liquid collection tanks are externally connected to a wastewater treatment device.

[0013] Furthermore, the water mist spray pipe in the first purification zone is connected to limestone purifying agent via a pipe, and the water mist spray pipe in the third purification zone is connected to ammonia purifying agent via a pipe.

[0014] The electrode paste production flue gas treatment system provided by this invention has the following beneficial effects: The present invention includes purification zones one and three, each equipped with a spiral-shaped water mist spray pipe and water mist nozzles evenly spaced on the spray pipe and inclined towards the main air intake pipe. Activated carbon blocks are located at the connection points between the water mist spray pipes and the nozzles. Combined with an electrode collection component in purification zone two, the flue gas entering the purification device is purified. Through the rational arrangement of the water mist nozzles and activated carbon blocks, the flow rate of the high-temperature airflow is slowed down, increasing its residence time within the purification device. This allows for better combination with the purifying agent sprayed from the water mist nozzles while simultaneously increasing its contact with the activated carbon blocks. Furthermore, through… The electrode collecting components installed in the second purification zone create an electric field, causing the water mist flowing with the airflow and the water mist-laden particles in the flue gas to become charged, thereby depositing the flue gas treated in the first purification zone. Finally, combined with the installation of a bag filter and activated carbon filter tube, the flue gas treated by the purification device is further purified, improving its purification effect. This invention is easy to operate, highly practical, and effectively solves the problems of poor flue gas purification effect, high single-sided utilization rate of activated carbon during use, low overall utilization efficiency, and increased frequency of activated carbon replacement in existing electrode paste production flue gas treatment systems. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the electrode paste production flue gas treatment system of the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of the flue gas treatment system for electrode paste production according to the present invention.

[0017] Figure 3 This is a schematic diagram of the water mist spray nozzle structure of the flue gas treatment system for electrode paste production according to the present invention.

[0018] Figure 4 This is a schematic diagram of the activated carbon block in the flue gas treatment system for electrode paste production of the present invention, located in purification zone one or purification zone three.

[0019] Figure 5 This is a schematic diagram of the design structure of the activated carbon block and water mist spray pipe in the flue gas treatment system for electrode paste production according to the present invention.

[0020] In the diagram, 1. Main air inlet pipe; 2. Main air outlet pipe; 3. Fan; 4. Housing; 5. Water mist spray pipe; 6. Water mist nozzle; 7. Purification zone 1; 8. Purification zone 2; 9. Purification zone 3; 10. Activated carbon block; 11. High-voltage electrode; 12. Filter bag; 13. Activated carbon filter element tube; 14. Through hole; 15. Fixing mesh; 16. Activated carbon filter cartridge; 17. Polytetrafluoroethylene filter membrane; 18. Liquid collection tank; 19. Filter block. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example 1 like Figure 1-5As shown, the present invention provides an electrode paste production flue gas treatment system, including a purification device and an operation controller. One end of the purification device is connected to the chimney of the calcining furnace through an inlet main pipe 1, and the other end of the purification device is connected to a blower 3 through an outlet main pipe 2. The purification device includes a housing 4 and water mist spray pipes 5 placed inside the housing 4. The housing 4 is made of high-temperature resistant material, and the outer layer of the housing 4 is provided with an insulating layer to improve the safety performance. Multiple sets of purification sections are arranged inside the housing 4 along the airflow direction through the water mist spray pipes 5. To ensure that the emitted flue gas meets the emission requirements, this application provides 2-3 sets of purification sections inside the housing 4 along the airflow direction through the water mist spray pipes 5. Composed of purification zone 7, purification zone 8, and purification zone 9, the housing 4 has an insulating and high-temperature resistant layer inside to further improve the safety of using the purification device of this application. Each of the three purification zones (7, 8, and 9) has a collection tank 18 inside the housing 4, and a filter block 19 is provided on the collection tank 18. The filter block 19 consists of a sponge filter layer and an activated carbon filter layer from top to bottom. The filter block 19 performs preliminary filtration of the settled water mist and particles settled in the flue gas. The collection tank 18 is connected to a wastewater treatment device, which treats the liquid discharged from the purification device for reuse, avoiding resource waste and improving resource utilization. The housing 4 is equipped with a bag filter corresponding to the main exhaust pipe 2. An activated carbon filter tube 13 is connected between the main exhaust pipe 2 and the fan 3. The bag filter and activated carbon filter tube 13 are provided with a flow channel for drawing and guiding the flue gas in the purification device, which further treats the volatile organic compounds and particulate matter in the airflow, thereby improving the treatment effect of the purification device on the flue gas produced by electrode paste. The exhaust end of the purification device is equipped with a bag filter combined with an activated carbon filter tube 13. On the one hand, it slows down the flow rate of the gas being purified in the purification section. That is, the gas being purified in the purification section enters the activated carbon filter tube 13 after passing through the bag filter and is then discharged after being treated by the activated carbon filter tube 13. On the other hand, it increases the residence time of the treated gas in the bag filter and activated carbon filter tube 13, thereby increasing the treatment and purification effect of the bag filter and activated carbon filter tube 13 on the gas.

[0023] like Figure 2-3As shown, the purification zone 7 and purification zone 9 of this application are equipped with spiral-shaped water mist spray pipes 5, and water mist nozzles 6 are installed at equal intervals on the water mist spray pipes 5, inclined towards the main air inlet pipe 1. Activated carbon blocks 10 are provided at the connection between the water mist spray pipes 5 and the water mist nozzles 6. The activated carbon blocks 10 are parallel to the water mist spray pipes 5 and perpendicular to the inner wall of the housing 4. The combination of the activated carbon blocks 10 and the water mist nozzles 6 slows down the flow of flue gas and increases the binding effect between flue gas and water mist. That is, the flue gas entering the purification device will slow down its flow speed under the spray pressure of the water mist nozzles 6, thereby increasing its binding effect with water mist. The water mist spray pipes 5 of the purification zone 7 of this application are connected to limestone purification agent through pipes. The sulfur dioxide in the flue gas is desulfurized by calcium oxide method through the sprayed limestone purification agent. The water mist spray pipes 5 of the purification zone 9 are connected to ammonia purification agent through pipes. The nitrogen oxides in the flue gas are purified by the sprayed ammonia purification agent.

[0024] This application uses a low-power exhaust fan 3, whose extraction force is set to be less than the injection pressure of the water mist nozzle 6 via an operating controller. Simultaneously, the flue gas velocity entering the purification device from the main intake pipe 1 is set to be less than the injection pressure of the water mist nozzle 6. That is, during the operation of the purification device, when the ratio of flue gas velocity to the injection pressure of the water mist nozzle 6 is 1:1.25, the water mist and flue gas combine well, and all indicators in subsequent emission gas detection meet emission requirements. When the ratio of flue gas velocity to the injection pressure of the water mist nozzle 6 is less than 1:1.25, the flue gas has a shorter residence time in the purification device, and its flow velocity is faster under the influence of the fan 3, resulting in poorer combination with the water mist, and consequently, lower nitrogen oxide levels in subsequent emission gas detection. The average emission of particulate matter is 527.48 mg / m³, and the average emission of solid waste is 38.74 mg / m³. When the ratio of flue gas velocity to the injection pressure of water mist nozzle 6 is greater than 1:1.25, the residence time of flue gas in the purification device can be increased, allowing it to fully contact the water mist. However, the flow rate is slow. As the main intake pipe 1 continuously delivers flue gas into the purification device, it will increase the air pressure of the purification device and cause the flue gas to carry too much water mist, which will easily reduce the purification effect of the subsequent bag filter and activated carbon filter tube 13. Therefore, during the operation of the purification device of this application, when the ratio of flue gas velocity to the injection pressure of water mist nozzle 6 is 1:1.25, it can meet the design requirements of this application for the treatment of flue gas from electrode paste production.

[0025] like Figure 2As shown, the purification zone 8 is equipped with an electrode collection component, which consists of a high-voltage electrode 11 and a grounding electrode. This creates an electric field to deposit the flue gas treated in the purification zone 7. To avoid corrosion, the high-voltage electrode 11 is a copper rod embedded in the inner medium tube. The purification zone 8 is equipped with a fixing mesh 15 for fixing the high-voltage electrode 11. The fixing mesh 15 is made of copper wire and is fixedly connected to the inner wall of the purification zone 8, so that both ends of the high-voltage electrode 11 are fixedly connected to the fixing mesh 15. The high-voltage electrode 11 carries a positive charge, and the grounding electrode carries a negative charge. That is, when the flue gas carrying water mist in the purification zone 7 passes through the electrode collection component, the particles in the flue gas carry a charge under the action of the high-voltage electrode 11. The charged particles are attracted to the grounding electrode by the electric field force, thus achieving the deposition of the flue gas and further improving the treatment effect of the purification device on the flue gas. This application samples and tests the exhaust gas at the tail end of the purification device. The test results show that the average emissions of nitrogen oxides in the electrode paste production flue gas treated by the purification device of this application are 486.50 mg / m³, the average emissions of particulate matter are 30.25 mg / m³, the average emissions of volatile organic compounds are 12.85 mg / m³, and the average emissions of sulfur dioxide are 1050.25 mg / m³. According to the "Emission Standard of Air Pollutants" (GB16297) and the "Emission Standard of Air Pollutants for Coking Ovens", the electrode paste production flue gas treated by the purification device of this application meets the emission requirements and the exhaust gas is qualified.

[0026] Example 2 Based on the above embodiments, this embodiment aims to increase the residence time of flue gas in the purification device while simultaneously enhancing the binding effect of flue gas and water mist, such as... Figure 2-5As shown, the extended axis of the connection end between the water mist nozzle 6 and the water mist spray pipe 5 is set at an angle of 15-30° with the housing 4. Through comparative production tests conducted by the applicant, it was found that when the extended axis of the connection end between the water mist nozzle 6 and the water mist spray pipe 5 is set at an angle of 22.5° with the housing 4, the water mist sprayed by the water mist nozzle 6 has the best combination effect with the flue gas. Comparative tests were conducted on flue gas extracted from purification zones 8 and 9 of the first-stage purification section and the flue gas from the inlet main pipe 1. The results showed that the particulate matter in the flue gas decreased progressively, with a significant effect, and the subsequent bag filter and activated carbon filter tube 13 functioned normally. When the extended axis of the connection end between the water mist nozzle 6 and the water mist spray pipe 5... When the angle between the line and the housing 4 is less than 22.5°, the particulate matter in the flue gas decreases step by step, but the effect is generally average. The subsequent bag filter and activated carbon filter tube 13 function normally. When the extended axis of the water mist nozzle 6 and the water mist spray pipe 5 is set at an angle greater than 22.5° with the housing 4, the particulate matter in the flue gas decreases step by step, and the effect is obvious. However, the humidity of the subsequent bag filter and activated carbon filter tube 13 is high, which easily increases the replacement frequency of the bag filter and activated carbon filter tube 13. Therefore, when the extended axis of the water mist nozzle 6 and the water mist spray pipe 5 is set at an angle of 22.5° with the housing 4, it can meet the design requirements of this application for the treatment of flue gas from electrode paste production.

[0027] This application utilizes a 22.5° angle between the extended axis of the water mist nozzle 6 and the water mist spray pipe 5 connecting to the housing 4. This allows the flue gas, under the influence of the fan 3's extraction and guidance, to form a vortex with the water mist sprayed from the water mist nozzle 6. The fan 3 extracts gas from the purification device, guiding the flue gas into the device. The combined action of the fan 3 and the water mist nozzle 6 creates a vortex within the purification device. This vortex increases particle collisions and enhances the binding effect between the flue gas and the water mist. The design of the water mist spray pipe 5 and water mist nozzle 6, combined with the fan 3, improves the binding effect of flue gas and water mist by more than 5% compared to existing high-temperature wet flue gas dust removal and purification devices. In other words, the flue gas in this application, under the guidance of the fan 3... When the flue gas enters the purification device, the spray pressure of the flue gas near the water mist nozzle 6 will cause some of the particulate matter in the flue gas to rebound and collide with the particulate matter carried in the incoming flue gas. Since the flue gas velocity is less than the spray pressure of the water mist nozzle 6, the particulate matter in the flue gas entering the purification zone 7 from the intake manifold 1 of this application will rebound layer by layer under the spray pressure of the water mist nozzle 6. The closer to the water mist nozzle 6, the greater the rebound force, and the greater the impact force on the subsequent flue gas. This will cause some particles to come into contact with the back of the activated carbon block 10 after being impacted. The activated carbon block 10 can slow down the flue gas velocity and increase the residence time of the flue gas in the device, so that the flue gas and the activated carbon block 10 can be fully contacted, thereby increasing the sedimentation of particles in the flue gas and increasing the utilization rate of the activated carbon block 10, thus improving its practical performance.

[0028] Example 3 Based on the above embodiments, this embodiment aims to improve the adsorption effect of activated carbon blocks 10 on flue gas by ensuring that the flue gas, under the guidance of fan 3 and the injection of water mist nozzles 6, can form vortices, thereby enhancing the adsorption effect of the flue gas. Figure 4 As shown, the activated carbon block 10 of this application has a length of 7-12cm, a width of 2-5cm, and a height of 10-15cm. The activated carbon block 10 of this application has a length of 8cm, a width of 3cm, and a height of 12cm. This allows it to increase the contact area between the flue gas and the activated carbon block 10 without affecting the formation of vortex in the flue gas within the purification device, thereby improving the adsorption effect of the activated carbon block 10. The activated carbon block 10 of this application is provided with airflow patterns (not shown in the figure) to enhance contact with the airflow. The airflow patterns are wavy and are arranged laterally on the activated carbon block 10. After the flue gas comes into contact with the activated carbon block 10 through the airflow patterns, it is dispersed to both sides of the activated carbon block 10 along the airflow patterns. This slows down the flow of the flue gas while increasing the contact between the flue gas and the activated carbon block 10, further improving the adsorption effect of the activated carbon block 10.

[0029] like Figure 4As shown, the activated carbon block 10 described in the present application is further provided with a plurality of through holes 14, and the activated carbon block 10 of the present application is further provided with 9 through holes 14, which are arranged in a "meter" shape on the activated carbon block 10. Through the arrangement of the through holes 14 on the activated carbon block 10, under the drainage effect of the fan 3, the adsorption effect of the activated carbon block 10 on flue gas is enhanced, while part of the flue gas passes through the through holes 14 and enters the rear area. Under the spraying action of the water mist nozzle 6, part of the flue gas passing through the through holes 14 rebounds, and in the rebounding process, it disturbs part of the flue gas flowing on both sides of the activated carbon block 10, making it move together with the rebounding flue gas, thereby increasing the collision and impact of particulate matter in the flue gas. Some particulate matter subjected to high collision and impact force will come into contact with the back surface of the activated carbon block 10. In the purification device of the present application, by utilizing the activated carbon block 10 in combination with the water mist nozzle 6, the utilization rate of the activated carbon block 10 is increased by 12% compared with the utilization rate of the activated carbon block 10 in the traditional flue gas treatment device for electrode paste production; in the present application, the spraying pressure of the water mist nozzle 6 can also be set by operating the controller, and the water mist spray pipe 5 is connected with clean water, so that the sprayed water mist can act on the activated carbon block 10 to clean the activated carbon block 10 after adsorption, further improving the service life of the activated carbon block 10, and the replacement frequency of the activated carbon block 10 is reduced by 18% compared with that in the traditional flue gas treatment device for electrode paste production.

[0030] Embodiment Four On the basis of the above embodiments, in this embodiment, in order to further improve the purification treatment effect of the purification device on particulate matter and volatile substances, as Figure 2 shown, the bag-type dust collector described in the present application is composed of a plurality of activated carbon filter cartridges 16 and filter bags 12. The activated carbon filter cartridges 16 are arranged adjacent to the end of the third purification zone 9 connected to the gas outlet main pipe 2, the filter bags 12 are arranged on the side of the activated carbon filter cartridges 16 opposite to the gas outlet main pipe 2, and a polytetrafluoroethylene filter membrane 17 is arranged on the side of the activated carbon filter cartridges 16 away from the gas outlet main pipe 2. In the present application, through the arrangement of the filter bags 12 and the polytetrafluoroethylene filter membrane 17 on the activated carbon filter cartridges 16, the gas treated by the gas flow purification part can be further purified, thereby improving the purification treatment effect of the purification device of the present application.

[0031] This application first sets the air intake volume at the intake manifold 1, the fan force of the blower 3, the spray pressure of the water mist nozzle 6, and the voltage of the electrode collection component through the operation controller. Even if the extraction force of the blower 3 is less than the spray pressure of the water mist nozzle 6, and the flue gas velocity entering the purification device at the intake manifold 1 is set to be less than the spray pressure of the water mist nozzle 6, the flue gas enters the purification device under the guidance of the blower 3. In purification zone 7 and purification zone 9, the sulfur dioxide and nitrogen oxides in the flue gas are cleaned by the corresponding purifying agents. Under the guidance of the blower 3, the flue gas near the water mist nozzle 6 will be subjected to the spray pressure, causing some of the particulate matter in the flue gas to rebound and collide with the particulate matter carried in the incoming flue gas. Because the flue gas velocity is less than the spray pressure of the water mist nozzle 6, the particulate matter in the flue gas entering purification zone 7 and purification zone 9 at the intake manifold 1 will rebound layer by layer under the action of the spray pressure of the water mist nozzle 6, with the particulate matter closer to the nozzle 6 being removed. The greater the rebound force of the water mist nozzle 6, the greater the impact force on the subsequent flue gas. This will cause some particles to come into contact with the back of the activated carbon block 10 after impact. The activated carbon block 10 can slow down the flue gas flow rate and increase the residence time of the flue gas in the device, so that the flue gas can fully contact the activated carbon block 10. The flue gas treated by the flue gas in ...

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flue gas treatment system for electrode paste production, comprising a purification device, one end of which is connected to the chimney of a calcining furnace via an inlet main pipe (1), and the other end of which is connected to a blower (3) via an outlet main pipe (2); characterized in that: The purification device comprises a housing (4) and a water mist nozzle pipe (5) arranged inside the housing (4). Inside the housing (4), a plurality of groups of purification sections are arranged along the airflow flow direction via the water mist nozzle pipe (5). The purification sections consist of a first purification zone (7), a second purification zone (8) and a third purification zone (9). The first purification zone (7) and the third purification zone (9) are provided with the water mist nozzle pipe (5) in a spiral shape, and water mist nozzles (6) installed obliquely towards the air intake main pipe (1) are arranged on the water mist nozzle pipe (5) at equal intervals. An activated carbon block (10) is arranged at the connection between the water mist nozzle pipe (5) and the water mist nozzle (6). The activated carbon block (10) is parallel to the water mist nozzle pipe (5) and arranged perpendicular to the inner wall of the housing (4). An electrode collection member is arranged inside the second purification zone (8). The electrode collection member consists of a high-voltage electrode (11) and a ground electrode, which forms an electric field to perform deposition treatment on the flue gas treated by the first purification zone (7). The housing (4) is provided with a bag-type dust collector corresponding to the air outlet main pipe (2), and an activated carbon filter element pipe (13) is connected between the air outlet main pipe (2) and the fan (3); The extension axis of the connection end between the water mist nozzle (6) and the water mist nozzle pipe (5) forms an included angle of 15-30° with the housing (4), so that the flue gas can form a vortex under the action of the water mist sprayed by the water mist nozzle (6) while being drawn and guided by the fan (3); The activated carbon block (10) has a length of 7-12cm, a width of 2-5cm and a height of 10-15cm. The activated carbon block (10) is provided with airflow patterns for enhancing contact with the airflow, and the airflow patterns are in a wavy shape and are transversely arranged on the activated carbon block (10); The activated carbon block (10) is further provided with a plurality of through holes (14), and the through holes (14) are arranged in a "rice" shape on the activated carbon block (10); The water mist nozzle pipe (5) in the first purification zone (7) is connected with a limestone purifying agent through a pipeline, and the water mist nozzle pipe (5) in the third purification zone (9) is connected with an ammonia water purifying agent through a pipeline.

2. The electrode paste production flue gas treatment system according to claim 1, characterized in that: A fixing net (15) for fixing the high-voltage electrode (11) is arranged inside the second purification zone (8). The fixing net (15) is made of copper wire material, wherein the fixing net (15) is fixedly connected with the inner wall of the second purification zone (8), so that both ends of the high-voltage electrode (11) are respectively fixedly connected to the fixing net (15).

3. The electrode paste production flue gas treatment system according to claim 1, characterized in that: The bag-type dust collector is composed of a plurality of activated carbon filter cartridges (16) and filter bags (12). The activated carbon filter cartridges (16) are arranged adjacent to each other at the end of the third purification zone (9) connected to the air outlet main pipe (2). The filter bags (12) are arranged on the side of the activated carbon filter cartridges (16) opposite to the air outlet main pipe (2), and a polytetrafluoroethylene filter membrane (17) is arranged on the side of the activated carbon filter cartridges (16) away from the air outlet main pipe (2).

4. The electrode paste production flue gas treatment system according to claim 1, characterized in that: The housing (4) is provided with an insulating high-temperature resistant layer. The housing (4) is provided with a liquid collection tank (18) corresponding to the first purification zone (7), the second purification zone (8) and the third purification zone (9). A filter block (19) is provided on the liquid collection tank (18). The filter block (19) is composed of a sponge filter layer and an activated carbon filter layer from top to bottom. The liquid collection tank (18) is connected to a wastewater treatment device.

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