Cadmium flue gas dust recovery and purification system

Abstract

The utility model discloses a cadmium flue gas dust recovery and purification system which comprises a primary dust removal assembly, a sedimentation assembly, a cooling and heat exchange assembly, a secondary dust removal assembly, a first dust removal fan and a chimney, the settling assembly is provided with a second air inlet and a second air outlet through which cadmium flue gas containing water vapor enters, one end of the cooling heat exchange assembly is connected with the first air outlet and the second air outlet, the other end of the cooling heat exchange assembly is connected with one end of the second-stage dust removal assembly, and one end of the first dust removal fan is connected with the other end of the second-stage dust removal assembly; and the other end of the first dust removal fan is connected with a chimney. Through step-by-step treatment, the system not only removes a large amount of dust and improves the filtering precision, but also can treat high-temperature and high-humidity flue gas, so that potential damage to rear equipment is avoided, and up-to-standard emission of the flue gas is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal, in particular to a cadmium fume dust recovery and purification system. Background Art

[0002] In the process of treating cadmium-containing flue gas dust, especially in the flue gas discharged by reduction furnaces, casting furnaces, holding furnaces and other equipment, these flue gases contain a large amount of cadmium oxide dust, which has small particle size, high concentration and high viscosity. The dust concentration released by the reduction furnace can be as high as 500-1000 mg / m 3 Without pretreatment, these dusts are very likely to clog the filter device, and due to their high temperature characteristics, they damage the back-end purification equipment. Currently, bag dust collectors are used to filter the polluted flue gas generated during the cadmium smelting process, but the filtration accuracy does not meet the standards and cannot handle high-temperature and high-humidity airflow. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the current filtering of polluted flue gas generated in the cadmium smelting process does not meet the filtering accuracy standards and is unable to handle high-temperature and high-humidity airflows.

[0004] In order to solve the above technical problems, the utility model provides a cadmium flue gas dust recovery and purification system, including a primary dust removal component, a sedimentation component, a cooling and heat exchange component, a secondary dust removal component, a first dust removal fan and a chimney, the primary dust removal component having a first air inlet and a first air outlet for cadmium flue gas to enter, the sedimentation component having a second air inlet and a second air outlet for cadmium flue gas containing water vapor to enter, one end of the cooling and heat exchange component being respectively connected to the first air outlet and the second air outlet, the other end of the cooling and heat exchange component being connected to one end of the secondary dust removal component, one end of the first dust removal fan being connected to the other end of the secondary dust removal component, and the other end of the first dust removal fan being connected to the chimney.

[0005] In some embodiments, the first-stage dust removal assembly includes a multi-cyclone dust collector, a first air inlet pipe and a first air outlet pipe, the multi-cyclone dust collector includes the first air inlet and the first air outlet, the first air inlet is connected to the first air inlet pipe, and the first air outlet is connected to the cooling and heat exchange assembly through the first air outlet pipe.

[0006] In some embodiments, the sedimentation assembly includes a sedimentation chamber, a multi-layer wind shield, an air balancing mesh plate, an ash discharge valve, a second air inlet pipe and a second air outlet pipe. The sedimentation chamber has a sedimentation cavity, the second air inlet, the second air outlet and a first ash discharge port. The second air inlet pipe is connected to the sedimentation cavity through the second air inlet, the second air outlet pipe is connected to the sedimentation cavity through the second air outlet, the ash discharge valve is connected to the sedimentation cavity through the first ash discharge port, the multi-layer wind shields are arranged in the sedimentation chamber in sequence, and the air balancing mesh plate is arranged at the second air inlet.

[0007] In some embodiments, the cooling heat exchange component includes a cooling heat exchanger, a third air inlet pipe and a third air outlet pipe. One end of the cooling heat exchanger is connected to the first air outlet and the second air outlet respectively through the third air inlet pipe, and the other end of the cooling heat exchanger is connected to the secondary dust removal component through the third air outlet pipe.

[0008] In some embodiments, the secondary dust removal assembly includes a plastic-fired plate dust collector, a wild wind valve, a temperature sensor, a fourth air inlet pipe and a fourth air outlet pipe. The plastic-fired plate dust collector is connected to the cooling and heat exchange assembly through the fourth air inlet pipe, the wild wind valve is arranged on the fourth air inlet pipe, the temperature sensor is arranged at the air inlet of the plastic-fired plate dust collector, and the air outlet of the plastic-fired plate dust collector is connected to the first dust removal fan through the fourth air outlet pipe.

[0009] In some embodiments, the plastic sintered board dust collector includes a first shell, a plurality of filter discs and a first dust cleaning structure, the first shell having a first installation cavity, a third air inlet connected to the first installation cavity, a third air outlet connected to the first installation cavity and a second ash discharge port connected to the first installation cavity, the plurality of filter discs are arranged in sequence in the first installation cavity and are located between the third air inlet and the third air outlet to form a filter channel for gas to pass through, the first dust cleaning structure extends into the first installation cavity, and the dust cleaning end of the first dust cleaning structure faces the filter disc to remove dust on the filter disc.

[0010] In some embodiments, the first dust cleaning structure includes an air tank, a pulse valve and a spray pipe, the air tank is connected to the spray pipe, and the pulse valve is arranged between the spray pipe and the air tank, the spray pipe has a spray port, and the spray port faces the filter.

[0011] In some embodiments, the plurality of filter plates are arranged at equal intervals in sequence along the first direction of the first installation cavity to divide the first installation cavity into a first sub-cavity and a second sub-cavity located on both sides of the filter plate, the third air inlet is connected to the first sub-cavity, the third air outlet is connected to the second sub-cavity, the second ash discharge port is arranged on a side of the first sub-cavity away from the filter plate, and the first dust cleaning structure extends into the second sub-cavity.

[0012] In some embodiments, it also includes a cartridge dust collector, a filter and a second dust removal fan, the cartridge dust collector, the filter and the second dust removal fan are connected in sequence, and the end of the second dust removal fan away from the filter is connected to the chimney.

[0013] In some embodiments, the filter cartridge dust collector includes a second shell, a plurality of filter bags and a second dust cleaning structure, the second shell having a second installation cavity, a fourth air inlet connected to the second installation cavity, a fourth air outlet connected to the second installation cavity and a third dust discharge port connected to the second installation cavity, the plurality of filter bags are arranged in sequence in the second installation cavity and are located between the fourth air inlet and the fourth air outlet to form a second filter channel for gas to pass through, the second dust cleaning structure extends into the second installation cavity, and the dust cleaning end of the second dust cleaning structure faces the filter bag to remove dust from the filter bag.

[0014] Compared with the prior art, the cadmium fume dust recovery and purification system of the utility model has the following beneficial effects:

[0015] The first-stage dust removal component of the embodiment of the utility model preliminarily removes the larger particles of cadmium dust in the cadmium flue gas to reduce the burden of subsequent processing steps and reduce the risk of blockage. In addition, the cadmium flue gas containing water vapor is separated into gas and liquid by the sedimentation component, and then the cadmium flue gas after preliminary dust removal and the cadmium flue gas with water vapor removed are cooled by the cooling and heat exchange component, which is not only conducive to improving the efficiency of subsequent dust removal and purification equipment, but also can reduce heat loss, recover heat to the production process, and realize the recycling of energy. After that, the secondary dust removal component is used to further capture the remaining fine particles to ensure that the emission standards are met, and the first dust removal fan provides sufficient airflow power to discharge the purified flue gas into the atmosphere through the chimney. Through step-by-step processing, this embodiment not only removes a large amount of dust and improves the filtration accuracy, but also can process high-temperature and high-humidity flue gas, avoiding potential damage to the rear equipment and achieving standard flue gas emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the cadmium fume dust recovery and purification system provided by the embodiment of the utility model;

[0017] Figure 2 This is a front view of a cadmium fume dust recovery and purification system provided by an embodiment of the utility model;

[0018] Figure 3 It is a cross-sectional view of a plastic sintered plate dust collector provided by an embodiment of the utility model;

[0019] Figure 4 It is a cross-sectional view of a cartridge dust collector provided by an embodiment of the utility model;

[0020] In the figure, 1, primary dust removal assembly; 11, multi-cyclone dust collector; 12, first air inlet pipe; 13, first air outlet pipe; 2, sedimentation assembly; 21, sedimentation chamber; 22, second air inlet pipe; 23, second air outlet pipe; 3, cooling and heat exchange assembly; 31, cooling and heat exchanger; 32, third air inlet pipe; 33, third air outlet pipe; 4, secondary dust removal assembly; 41, plastic sintered plate dust collector; 411, first shell; 4111, first installation cavity; 4112, third air inlet; 4113, third air outlet port; 4114, second ash discharge port; 412, filter; 413, first dust cleaning structure; 4131, gas storage tank; 4132, pulse valve; 4133, injection pipe; 42, fourth air inlet pipe; 5, first dust removal fan; 6, chimney; 7, cartridge dust collector; 71, second shell; 711, second installation cavity; 712, fourth air inlet; 713, fourth air outlet; 714, third ash discharge port; 72, filter bag; 73, second dust cleaning structure; 8, filter; 9, second dust removal fan. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] like Figure 1 As shown, the utility model provides a cadmium flue gas dust recovery and purification system, including a primary dust removal component 1, a sedimentation component 2, a cooling and heat exchange component 3, a secondary dust removal component 4, a first dust removal fan 5 and a chimney 6, the primary dust removal component 1 has a first air inlet and a first air outlet for cadmium flue gas to enter, the sedimentation component 2 has a second air inlet and a second air outlet for cadmium flue gas containing water vapor to enter, one end of the cooling and heat exchange component 3 is respectively connected to the first air outlet and the second air outlet, the other end of the cooling and heat exchange component 3 is connected to one end of the secondary dust removal component 4, one end of the first dust removal fan 5 is connected to the other end of the secondary dust removal component 4, and the other end of the first dust removal fan 5 is connected to the chimney 6.

[0023] Based on the above structure, the primary dust removal component 1 of this embodiment preliminarily removes the larger particles of cadmium dust in the cadmium flue gas to reduce the burden of subsequent processing steps and reduce the risk of blockage. In addition, the cadmium flue gas containing water vapor is separated into gas and liquid by the sedimentation component 2, and then the cadmium flue gas after preliminary dust removal and the cadmium flue gas with water vapor removed are cooled by the cooling and heat exchange component 3, which is not only conducive to improving the efficiency of subsequent dust removal and purification equipment, but also can reduce heat loss, recover heat to the production process, and realize the recycling of energy. After that, the secondary dust removal component 4 is used to further capture the remaining fine particles to ensure that the emission standards are met, and the first dust removal fan 5 provides sufficient airflow power to discharge the purified flue gas into the atmosphere through the chimney 6. Through step-by-step processing, this embodiment not only removes a large amount of dust and improves the filtration accuracy, but also can process high-temperature and high-humidity flue gas, avoiding potential damage to the rear equipment and achieving standard flue gas emissions.

[0024] In some embodiments, the first-stage dust removal component 1 includes a multi-cyclone dust collector 11, a first air inlet pipe 12 and a first air outlet pipe 13. The multi-cyclone dust collector 11 includes a first air inlet and a first air outlet. The first air inlet is connected to the first air inlet pipe 12, and the first air outlet is connected to the cooling and heat exchange component 3 through the first air outlet pipe 13.

[0025] The cadmium flue gas first enters the first air inlet of the multi-cyclone dust collector 11 through the first air inlet pipe 12. When the cadmium flue gas enters the multi-cyclone dust collector 11 at a high speed, a strong vortex motion is formed inside the multi-cyclone dust collector 11. Due to the centrifugal force, the heavier particles are thrown to the outer wall and fall into the dust collecting chamber of the multi-cyclone dust collector 11 under the action of gravity, while the purified gas is discharged from the first air outlet and then transported to the cooling and heat exchange component 3 through the first air outlet pipe 13 to reduce the gas temperature.

[0026] In some embodiments, the sedimentation assembly 2 includes a sedimentation chamber 21, a multi-layer wind shield, an air balancing mesh plate, an ash discharge valve, a second air inlet pipe 22 and a second air outlet pipe 23. The sedimentation chamber 21 has a sedimentation chamber, a second air inlet, a second air outlet and a first ash discharge port. The second air inlet pipe 22 is connected to the sedimentation chamber through the second air inlet, and the second air outlet pipe 23 is connected to the sedimentation chamber through the second air outlet. The ash discharge valve is connected to the sedimentation chamber through the first ash discharge port, which is used to regularly or continuously remove solid particles (dust or other sediments) settled to the bottom of the sedimentation chamber to maintain the continuous operation capability of the system; the multi-layer wind shield is arranged in sequence at intervals in the sedimentation chamber 21 to increase the chance of particle sedimentation and enhance the separation effect. The air balancing mesh plate is arranged at the second air inlet to make the gas entering the sedimentation chamber 21 more evenly distributed, avoid local excessive speed resulting in the failure of particle sedimentation, ensure the uniformity of air flow distribution in the entire sedimentation chamber, and improve the sedimentation efficiency. This embodiment realizes water vapor separation of cadmium flue gas containing water vapor through the above structure. In addition, the provision of multi-layer wind shield plates and wind equalizing mesh plates improves the settling efficiency.

[0027] In some embodiments, the cooling and heat exchange component 3 includes a cooling and heat exchanger 31, a third air inlet pipe 32 and a third air outlet pipe 33. The cooling and heat exchanger 31 is used to absorb the heat of the high-temperature gas and cool it down to protect the subsequent equipment from high-temperature damage. One end of the cooling and heat exchanger 31 is connected to the first air outlet and the second air outlet respectively through the third air inlet pipe 32. The third air inlet pipe 32 is used to guide the gas that has been processed by the first-level dust removal component 1 but is still in a high-temperature state into the cooling and heat exchanger 31, providing an air flow channel on the heat source side for the heat exchange process; the other end of the cooling and heat exchanger 31 is connected to the second-level dust removal component 4 through the third air outlet pipe 33, and the gas after cooling treatment by the cooling and heat exchanger 31 is transported to the second-level dust removal component 4 through the third air outlet pipe 33 for dust removal treatment.

[0028] In some embodiments, the secondary dust removal component 4 includes a plastic sintered plate dust collector 41, a wild air valve, a temperature sensor, a fourth air inlet pipe 42 and a fourth air outlet pipe. The plastic sintered plate dust collector 41 is connected to the cooling and heat exchange component 3 through the fourth air inlet pipe 42 to introduce the gas treated by the cooling and heat exchange component 3 into the plastic sintered plate dust collector 41 for secondary purification; the wild air valve is arranged on the fourth air inlet pipe 42 to introduce external air when the system needs it, so as to adjust the gas temperature and flow rate (such as gas temperature) entering the plastic sintered plate dust collector 41. When the temperature is too high and may damage the filter plate, the wild wind valve is opened and cold air is mixed in to cool it down); a temperature sensor is arranged at the air inlet of the plastic-sintered plate dust collector 41 to monitor the temperature of the incoming gas and feedback the temperature data in real time. When an abnormal temperature rise is detected, the wild wind valve is started to cool down the air; the air outlet of the plastic-sintered plate dust collector 41 is connected to the first dust removal fan 5 through the fourth air outlet pipe, and the clean gas purified by the plastic-sintered plate dust collector 41 is transmitted to the first dust removal fan 5, and finally discharged into the atmosphere through the chimney 6.

[0029] This embodiment ensures that residual dust in the flue gas is effectively removed through fine filtration of the plastic sintered plate dust collector 41, temperature control of the wild air valve, monitoring of the temperature sensor and the setting of the inlet and outlet ducts, while ensuring the stable operation and safety of the entire system.

[0030] In some embodiments, the sintered board dust collector 41 includes a first shell 411, a plurality of filter sheets 412 and a first dust cleaning structure 413. The first shell 411 has a first installation cavity 4111, a third air inlet 4112, a third air outlet 4113 and a second ash discharge port 4114. The first installation cavity 4111 is used to place the filter; in addition, the third air inlet 4112 is connected to the first installation cavity 4111 so that the smoke enters the first installation cavity 4111 from there, the third air outlet 4113 is connected to the first installation cavity 4111, and the filtered gas is output from this port. The second ash discharge port 4114 is connected to the first installation cavity 4111 for collecting and discharging the smoke removed from the filter sheet 412. Dust; multiple filter discs 412 are arranged in the first installation cavity 4111 at intervals in sequence, and are located between the third air inlet 4112 and the third air outlet 4113 to form a filtering channel for gas to pass through, so that when the dust-laden gas passes through, the dust is retained on the outer surface of the filter disc 412, and the purified gas passes through the filter disc 412; the first dust cleaning structure 413 extends into the first installation cavity 4111, and the dust cleaning end of the first dust cleaning structure 413 faces the filter disc 412, and is carried out by pulse blowing, that is, compressed air is periodically sprayed onto the back of the filter disc 412 to remove the dust on the filter disc 412, and then falls into the ash hopper by gravity or auxiliary airflow and is discharged through the second ash discharge port 4114.

[0031] In some embodiments, the first dust cleaning structure 413 includes an air tank 4131, a pulse valve 4132 and a spray pipe 4133. The air tank 4131 is used to store compressed air. At the beginning of the cleaning cycle, it provides the necessary high-pressure air to clean the filter 412. The air tank 4131 is connected to the spray pipe 4133, and the pulse valve 4132 is arranged between the spray pipe 4133 and the air tank 4131. When the pulse valve 4132 receives a cleaning command to open, it instantly releases the high-pressure air in the air tank 4131 to form a strong pulse airflow to clean the filter 412. The pulse valve 4132 not only ensures the rapid release of air, but also keeps the system closed in the non-cleaning stage to prevent air leakage; the injection pipe 4133 has an injection port for high-pressure air to be ejected in the form of high-speed pulses, and the injection port is directed toward the filter 412, so that the ejected high-pressure air impacts the surface of the filter 412, shakes off the dust accumulated on the filter 412, and makes it separate from the filter 412 and fall into the second dust discharge port 4114. This embodiment performs dust cleaning through the above structure, avoids the accumulation of filtering resistance, and maintains the high air permeability of the filter 412.

[0032] In some embodiments, multiple filter discs 412 are arranged in sequence and equidistantly along the first direction of the first installation cavity 4111, ensuring that the airflow can evenly flow through each filter disc 412 when passing through the first installation cavity 4111, thereby improving the efficiency of the gas contacting the filter medium, and making the dust particles more evenly distributed and captured on the filter disc 412. At the same time, the above-mentioned arrangement divides the first installation cavity 4111 into a first sub-cavity and a second sub-cavity located on both sides of the filter disc 412, so that the gas flow path is optimized; the third air inlet 4112 is connected to the first sub-cavity, and the third air outlet 4113 is connected to the second sub-cavity, so that the dust-containing gas first enters the first sub-cavity, and then must pass through the filter disc 412 to reach the second sub-cavity, thereby achieving effective interception of dust particles; the second dust discharge port 4114 is arranged on the side of the first sub-cavity away from the filter disc 412, so as to facilitate the collection of dust removed from the filter disc 412 by the cleaning structure. When the dust cleaning process occurs, the dust naturally falls to this area due to gravity, which is convenient for centralized collection and discharge, maintaining the high efficiency of dust cleaning and the cleanliness of the system; the first dust cleaning structure 413 extends into the second sub-chamber, so that the dust cleaning operation can be carried out without interfering with the normal flow of gas. When the pulse dust cleaning is started, the high-pressure air directly acts on the back of the filter 412 through the injection port, effectively shaking off the dust on it, and the dust then falls into the first sub-chamber and is discharged through the second dust discharge port 4114.

[0033] It should be noted that the first direction of this embodiment is perpendicular to the flow direction of the gas.

[0034] In some embodiments, it also includes a cartridge dust collector 7, a filter 8 and a second dust removal fan 9. The cartridge dust collector 7, the filter 8 and the second dust removal fan 9 are connected in sequence, and the end of the second dust removal fan 9 away from the filter 8 is connected to the chimney 6. The cartridge dust collector 7 of this embodiment is used to remove cadmium-containing dust in the workshop environment, and the dust is filtered through the filter 8, and then the purified gas is sent to the chimney 6 for discharge through the second dust removal fan 9, so as to achieve environmental dust emission standards.

[0035] In some embodiments, the filter cartridge dust collector 7 includes a second shell 71, multiple filter bags 72 and a second dust cleaning structure 73. The second shell 71 has a second installation cavity 711, a fourth air inlet 712 connected to the second installation cavity 711, a fourth air outlet 713 connected to the second installation cavity 711 and a third dust discharge port 714 connected to the second installation cavity 711. The second installation cavity 711 is the space where the filter bag 72 is installed, and is the core area for gas filtration and dust collection. The fourth air inlet 712 is the entrance for dust-containing gas to enter the second installation cavity 711, and the fourth air outlet 713 is the outlet for purified gas to leave the filter cartridge dust collector 7, ensuring that the gas can smoothly pass through the filter bag 72 for filtration processing; the third dust discharge port 714 is used to collect and discharge dust removed from the filter bag 72. , multiple filter bags 72 are arranged in the second installation cavity 711 at intervals in sequence, and are located between the fourth air inlet 712 and the fourth air outlet 713 to form a second filter channel for gas to pass through. When the dust-laden gas passes through the filter bag 72, the dust is trapped on the outer surface or inside of the filter bag 72, and the clean gas continues to flow to the fourth air outlet 713 through the filter bag 72. The second dust cleaning structure 73 extends into the second installation cavity 711, and the dust cleaning end of the second dust cleaning structure 73 faces the filter bag 72 to remove the dust on the filter bag 72. When the cleaning cycle starts, the high-pressure air in the air storage tank 4131 is instantly released through the pulse valve 4132 and the blowpipe, generating a pulse airflow to impact the filter bag 72, shaking off the dust attached to the surface of the filter bag 72, and the dust then falls into the third dust discharge port 714 by gravity.

[0036] It can be understood that the second dust cleaning structure 73 of this embodiment includes a second air storage tank, a second pulse valve and a second blowing pipe. The dust cleaning end of the second dust cleaning structure 73 penetrates into the second installation cavity 711 and directly faces the filter bag 72.

[0037] To sum up, the embodiment of the utility model provides a cadmium flue gas dust recovery and purification system, which, through step-by-step processing, not only removes a large amount of dust and improves the filtration accuracy, but also can process high-temperature and high-humidity flue gas, avoiding potential damage to the rear equipment and achieving standard flue gas emissions.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A cadmium flue gas dust recovery and purification system, characterized in that: It includes a primary dust removal component, a sedimentation component, a cooling and heat exchange component, a secondary dust removal component, a first dust removal fan and a chimney. The primary dust removal component has a first air inlet and a first air outlet for cadmium flue gas to enter, the sedimentation component has a second air inlet and a second air outlet for cadmium flue gas containing water vapor to enter, one end of the cooling and heat exchange component is respectively connected to the first air outlet and the second air outlet, the other end of the cooling and heat exchange component is connected to one end of the secondary dust removal component, one end of the first dust removal fan is connected to the other end of the secondary dust removal component, and the other end of the first dust removal fan is connected to the chimney.

2. The cadmium fume dust recovery and purification system according to claim 1 is characterized in that: The first-stage dust removal component includes a multi-cyclone dust collector, a first air inlet pipe and a first air outlet pipe. The multi-cyclone dust collector includes the first air inlet and the first air outlet. The first air inlet is connected to the first air inlet pipe, and the first air outlet is connected to the cooling and heat exchange component through the first air outlet pipe.

3. The cadmium fume dust recovery and purification system according to claim 1 is characterized in that: The sedimentation assembly includes a sedimentation chamber, a multi-layer wind shield, an air balancing mesh plate, an ash discharge valve, a second air inlet pipe and a second air outlet pipe. The sedimentation chamber has a sedimentation cavity, the second air inlet, the second air outlet and a first ash discharge port. The second air inlet pipe is connected to the sedimentation cavity through the second air inlet, the second air outlet pipe is connected to the sedimentation cavity through the second air outlet, the ash discharge valve is connected to the sedimentation cavity through the first ash discharge port, the multi-layer wind shields are arranged in the sedimentation chamber in sequence, and the air balancing mesh plate is arranged at the second air inlet.

4. The cadmium fume dust recovery and purification system according to claim 1 is characterized in that: The cooling and heat exchange component includes a cooling heat exchanger, a third air inlet pipe and a third air outlet pipe. One end of the cooling heat exchanger is connected to the first air outlet and the second air outlet respectively through the third air inlet pipe, and the other end of the cooling heat exchanger is connected to the secondary dust removal component through the third air outlet pipe.

5. The cadmium fume dust recovery and purification system according to claim 1 is characterized in that: The secondary dust removal component includes a plastic-fired plate dust collector, a wild wind valve, a temperature sensor, a fourth air inlet pipe and a fourth air outlet pipe. The plastic-fired plate dust collector is connected to the cooling and heat exchange component through the fourth air inlet pipe, the wild wind valve is arranged on the fourth air inlet pipe, the temperature sensor is arranged at the air inlet of the plastic-fired plate dust collector, and the air outlet of the plastic-fired plate dust collector is connected to the first dust removal fan through the fourth air outlet pipe.

6. The cadmium fume dust recovery and purification system according to claim 5 is characterized in that: The plastic sintered board dust collector includes a first shell, a plurality of filter discs and a first dust cleaning structure. The first shell has a first installation cavity, a third air inlet connected to the first installation cavity, a third air outlet connected to the first installation cavity and a second dust discharge port connected to the first installation cavity. The plurality of filter discs are arranged in the first installation cavity in sequence and are located between the third air inlet and the third air outlet to form a filter channel for gas to pass through. The first dust cleaning structure extends into the first installation cavity, and the dust cleaning end of the first dust cleaning structure faces the filter disc to remove dust on the filter disc.

7. The cadmium fume dust recovery and purification system according to claim 6 is characterized in that: The first dust cleaning structure includes an air tank, a pulse valve and an injection pipe, the air tank is connected to the injection pipe, and the pulse valve is arranged between the injection pipe and the air tank, the injection pipe has an injection port, and the injection port faces the filter.

8. The cadmium fume dust recovery and purification system according to claim 6 is characterized in that: The plurality of filter plates are arranged at equal intervals in sequence along the first direction of the first installation cavity to divide the first installation cavity into a first sub-cavity and a second sub-cavity located on both sides of the filter plate, the third air inlet is connected to the first sub-cavity, the third air outlet is connected to the second sub-cavity, the second dust discharge port is arranged on a side of the first sub-cavity away from the filter plate, and the first dust cleaning structure extends into the second sub-cavity.

9. The cadmium fume dust recovery and purification system according to claim 1, characterized in that: It also includes a cartridge dust collector, a filter and a second dust removal fan, which are connected in sequence, and the second dust removal fan is connected to the chimney at one end away from the filter.

10. The cadmium fume dust recovery and purification system according to claim 9, characterized in that: The filter cartridge dust collector includes a second shell, a plurality of filter bags and a second dust cleaning structure, the second shell having a second installation cavity, a fourth air inlet connected to the second installation cavity, a fourth air outlet connected to the second installation cavity and a third dust discharge port connected to the second installation cavity, the plurality of filter bags are sequentially arranged in the second installation cavity and are located between the fourth air inlet and the fourth air outlet to form a second filter channel for gas to pass through, the second dust cleaning structure extends into the second installation cavity, and the dust cleaning end of the second dust cleaning structure faces the filter bag to remove dust from the filter bag.

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