Waste gas purification system applied to plastic granulation industry

Abstract

The utility model relates to a waste gas purification system applied to the plastic granulation industry. Comprising a filtration and adsorption system and a desorption catalysis system, the filtration and adsorption system comprises an air inlet pipeline, a wet-type high-voltage electrostatic purifier, a high-efficiency dry-type filter and an activated carbon adsorption bed, and the air inlet pipeline, the wet-type high-voltage electrostatic purifier, the high-efficiency dry-type filter and the activated carbon adsorption bed are connected in sequence; the wet-type high-voltage electrostatic purifier and the high-efficiency dry-type filter can effectively filter solid substances formed by solidification of high-temperature vaporized plastic flue gas after the plastic flue gas is cooled, particulate matters and organic pollutants in waste gas are effectively removed, blockage of a breather pipe and activated carbon is effectively avoided, and frequent replacement of adsorption materials is avoided. The desorption catalysis system comprises a desorption air outlet pipe, a catalysis bed, an air cooler and a catalysis air outlet pipe and has the function of converting harmful gas into carbon dioxide and water, and the waste gas purification system can continuously and stably treat waste gas.

Description

Technical Field

[0001] The utility model relates to the field of atmospheric environmental protection management, and in particular to a waste gas purification system applied to the plastic granulation industry. Background Art

[0002] Granulation is a common plastic processing method. It is a process of mixing plastic raw materials in a certain proportion, heating, melting, and cooling them into granular substances. Granulation can change the physical properties of plastics, such as color, hardness, toughness, etc., which is very necessary for production needs in different fields. At the same time, granulation can save materials and reduce costs, because plastic products made of granules are more economical than using whole pieces of raw materials. The specific process of plastic granulation is to put the powdered plastic material into the granulator, and then through the steps of heating, melting and cooling, the plastic material is made into granules, and finally grading through the screen to obtain particles of different sizes. During the granulation process, the die head, vacuum exhaust port, etc. of the machine will continue to emit harmful fumes containing various types of plastics due to heat and melting. If not treated, it will seriously pollute the environment.

[0003] Currently, the commonly used environmental protection facilities on the market are spray towers and two-stage activated carbon adsorption. Since the high-temperature vaporized plastic flue gas easily solidifies into a solid state when it is cooled, it adheres to the pipe wall and the adsorbent activated carbon, causing blockage of the air duct and activated carbon. Once blocked, they need to be replaced, which increases maintenance costs and seriously affects production. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide an exhaust gas purification system for the plastic granulation industry. The system can effectively treat the exhaust gas generated by plastic granulation, remove harmful gases such as organic pollutants, effectively filter the solidified substances in the plastic smoke when it is cold, and reduce the blockage of adsorbed activated carbon and air ducts. In addition, the desorption catalytic system can convert the harmful gases adsorbed in the exhaust gas into carbon dioxide and water discharge, reducing environmental pollution.

[0005] In order to achieve the purpose of the utility model, the utility model provides an exhaust gas purification system applied to the plastic granulation industry. It includes a filtering and adsorption system and a desorption catalytic system. The filtering and adsorption system includes an air inlet duct, a high-voltage electrostatic purifier, a high-efficiency dry filter, and an activated carbon adsorption bed. The air duct, the high-voltage electrostatic purifier, the high-efficiency dry filter, and the activated carbon adsorption bed are connected in sequence. The high-voltage electrostatic purifier and the high-efficiency dry filter filter and adsorb particles of different diameters in the plastic fume waste gas, respectively. The desorption catalytic system includes a desorption air inlet duct, a catalytic bed, a cold air blower, and a catalytic air outlet duct. The desorption air outlet duct is arranged between the activated carbon adsorption bed and the catalytic bed. The catalytic bed is arranged between the air inlet duct and the catalytic air outlet duct. The catalytic air outlet duct is connected to the top of the catalytic bed. The cold air blower is arranged on the catalytic air outlet duct near the connection end of the catalytic bed and the catalytic air outlet duct.

[0006] In some embodiments of the present invention, a system fan and a chimney are included.

[0007] In some embodiments of the present invention, the activated carbon adsorption beds are arranged in sequence.

[0008] In some embodiments of the utility model, the tops of the activated carbon adsorption beds are respectively connected to pipelines, and the side surface of the top of one of the activated carbon adsorption beds is connected to the catalytic air outlet pipe.

[0009] In some embodiments of the present invention, the air inlet of the pipeline between the high-efficiency dry filter and the activated carbon adsorption bed is connected to the bottom of the activated carbon adsorption bed.

[0010] In some embodiments of the present invention, a fire damper is included, and the fire damper is used to detect smoke temperature and prevent fire.

[0011] In some embodiments of the utility model, the fire damper is arranged on the air inlet duct and is connected to the air inlet duct of the wet high-voltage electrostatic purifier near the end of the air inlet duct.

[0012] In some embodiments of the present invention, a chimney inspection port is provided at the top of the chimney.

[0013] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0014] The utility model is provided with a filtering and adsorption system having a high-voltage electrostatic purifier, a high-efficiency dry filter, and an activated carbon adsorption bed. The activated carbon adsorption bed is used to adsorb and purify harmful gases. The high-voltage electrostatic purifier and the high-efficiency dry filter can filter and adsorb particles of different diameters in the plastic smoke exhaust gas, respectively, and can effectively filter the solid matter formed by the high-temperature vaporized plastic smoke solidifying after being cooled, effectively avoiding the solid matter from adhering to the wall of the ventilation pipe and the adsorbent activated carbon, effectively removing the particles and organic pollutants in the exhaust gas, effectively avoiding the blockage of the ventilation pipe and the activated carbon, avoiding the need for frequent replacement of the adsorption material, and improving the use efficiency and life of the ventilation pipe and the activated carbon adsorption material. The desorption catalytic system converts the organic pollutants in the waste into carbon dioxide and water, and enables the exhaust gas purification system to continuously and stably treat the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of an exhaust gas purification system of the utility model structure.

[0016] Among them, there are filtering and adsorption system 10, air inlet duct 11, wet high-voltage electrostatic purifier 12, high-efficiency dry filter 13, activated carbon adsorption bed 14, desorption catalytic system 20, desorption outlet duct 21, catalytic bed 22, air cooler 23, catalytic outlet duct 24, cyclone washing tower 3, fire damper 4, system fan 5, chimney 6, and chimney detection port 7.

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, this embodiment provides an exhaust gas purification system, which has the function of reducing the blockage of adsorbed activated carbon and air ducts and purifying exhaust gas, can effectively remove particulate matter and organic pollutants in exhaust gas, and can be used for a long time without replacing adsorbent materials, reducing costs. The exhaust gas purification system also has the function of prompting the desorption catalytic system to convert harmful gases into carbon dioxide and water, and enables the exhaust gas purification system to continuously and stably treat exhaust gas. The exhaust gas purification system of this embodiment is particularly suitable for the treatment of plastic granulation exhaust gas. Of course, the exhaust gas purification system of this embodiment can also be used for other industrial exhaust gas treatment.

[0019] Specifically, the exhaust gas purification system of this embodiment includes a filtering and adsorption system 10 and a desorption catalytic system 20. The filtering and adsorption system 10 is mainly used for filtering exhaust gas particles and exhaust gas adsorption treatment, and the desorption catalytic system 20 is mainly used for desorption and purification of the activated carbon adsorption bed 14 in the filtering and adsorption system 10. The wet high-voltage electrostatic purifier 12 and the high-efficiency dry filter 13 in the filtering and adsorption system 10 can effectively filter the solid matter formed by the high-temperature vaporized plastic smoke solidifying after being cooled, effectively avoid the solid matter adhering to the wall of the ventilation pipe and the adsorbent activated carbon, effectively avoid the blockage of the ventilation pipe and the activated carbon, and improve the use efficiency and durability of the ventilation pipe and the activated carbon adsorption material. Start the desorption catalytic system 20 to desorb harmful gases from the activated carbon adsorption bed 14 in the filtering and adsorption system 10, avoid the need to frequently replace the adsorption material, improve the use continuity and stability of the exhaust gas purification system, and reduce the operating cost. The filtering and adsorption system 10 and the desorption catalytic system 20 can be started at the same time, or they can be started at different times.

[0020] Among them, the filtration and adsorption system 10 includes an air inlet duct 11, a wet high-voltage electrostatic purifier 12, a high-efficiency dry filter 13 and an activated carbon adsorption bed 14. The air inlet duct 11 is used to introduce the exhaust gas from the cyclone scrubber into the wet high-voltage electrostatic purifier 12, and the wet high-voltage electrostatic purifier 12 is used to remove the solidified particulate matter entrained in the exhaust gas. The humid environment of the wet high-voltage electrostatic purifier 12 can increase the collision chance between the particulate matter and water, and improve the efficiency of capture and sedimentation. The ionization action ionizes the particles in the air through the electric field, making it easier to collect and remove. The electric field action is to collect the charged ions on the electrostatic filter through the attraction of the electric field, thereby removing the particles in the air, and then achieving the purpose of removing plastic smoke. The wet high-voltage electrostatic purifier 12 has the advantages of high efficiency in filtering particulate matter, strong adaptability, high removal rate, low water consumption, and long service life of the device. The high-efficiency dry filter 13 is used to further filter the waste gas after being filtered by the wet high-voltage electrostatic purifier 12. The high-efficiency dry filter 13 can filter the water mist and micron-sized particles in the waste gas to prevent the activated carbon from being blocked. The high-efficiency dry filter 13 has the advantages of high purification efficiency, flame retardancy, safety, long service life and reusability. The activated carbon adsorption bed 14 is used to remove harmful gases such as organic pollutants. The air inlet duct 11, the wet high-voltage electrostatic purifier 12, the high-efficiency dry filter 13 and the activated carbon adsorption bed 14 are connected in sequence, so that the waste gas first passes through the wet high-voltage electrostatic purifier 12 and the high-efficiency dry filter 13 for secondary filtration of plastic flue gas waste gas. The wet high-voltage electrostatic purifier 12 and the high-efficiency dry filter 13 filter and adsorb particles of different diameters in the plastic flue gas waste gas respectively. After the filtration and purification of the waste gas particles, the gas enters the activated carbon adsorption bed 14 for harmful gas adsorption. After the adsorption is completed, the gas enters the exhaust duct and is discharged to the chimney 6 and then to the outside under the action of the system fan 5. There is a chimney detection port 7 on the top of the chimney 6 for detecting whether the discharged gas meets the standard.

[0021] Before the exhaust gas enters the activated carbon adsorption bed 14, the exhaust gas is first filtered by the wet high-voltage electrostatic purifier 12 and the high-efficiency dry filter 13, which can effectively filter the solid matter formed by the high-temperature vaporized plastic smoke that solidifies after being cooled, effectively prevent the solid matter from adhering to the wall of the ventilation pipe and the adsorbent activated carbon, effectively prevent the blockage of the ventilation pipe and the activated carbon, avoid the need for frequent replacement of adsorption materials, and improve the use efficiency and life of the ventilation pipe and activated carbon adsorption materials.

[0022] When the filtration and adsorption system 10 is working, the exhaust gas enters the cyclone washing tower 3. Through the centrifugal force of the cyclone tower, the plastic solidified by cold is sunk into the water pool below. The water pool of the cyclone tower is cleaned by slag scooping, and the exhaust gas is cooled at the same time. Then, it enters the wet high-voltage electrostatic purifier 12 along the air inlet duct 11. The tiny plastic particles are charged and attached to the anode plate under the action of the electric field, thereby achieving the purpose of removing plastic fume. Then, it enters the high-efficiency dry filter 13 to remove micron-sized particles and prevent clogging of activated carbon. Then, it enters the activated carbon adsorption bed 14 to remove harmful gases such as organic pollutants. Under the action of the system fan 5, the exhaust gas is discharged to the outside through the chimney 6 and the chimney detection port 7.

[0023] The desorption catalytic system 20 includes a desorption air outlet pipe 21, a catalytic bed 22, a cooling fan 23 and a catalytic air outlet pipe 24. The desorption air outlet pipe 21 is arranged between the activated carbon adsorption bed 14 and the catalytic bed 22, and is used to provide desorption gas; the catalytic bed 22 is arranged between the desorption air outlet pipe 21 and the catalytic air outlet pipe 24, and is used to catalyze the conversion of harmful gases in the exhaust gas into carbon dioxide and water; the cooling fan 23 is arranged on the catalytic air outlet pipe 24 near the connection end between the catalytic bed 22 and the catalytic air outlet pipe 24, and is used to provide the desorption gas to enter the desorption air outlet pipe 21 to provide gas flow power, and at the same time, to provide gas flow power for the catalytic gas to be discharged into the catalytic air outlet pipe 24, and also acts on the rapid cooling of the catalytic gas. The catalytic air outlet pipe 24 is connected to the top of the catalytic bed 22, and is used to discharge the catalytic gas such as carbon dioxide;

[0024] When the desorption catalytic system 20 is working, when the activated carbon adsorption bed 14 is saturated with adsorption, the air cooler 23 is started. Under the action of the air cooler 23, the gas containing organic pollutants desorbed in the activated carbon adsorption bed 14 enters the catalytic bed 22 from the desorption outlet pipe 21. The gas is converted into carbon dioxide and water under the action of the catalytic bed 22. The carbon dioxide is then discharged from the catalytic outlet pipe 24 to the pipeline and enters the chimney for discharge.

[0025] The exhaust gas purification system of this embodiment also includes a fire damper 4, which is used to detect the smoke temperature and prevent fire. The fire damper 4 is usually open. When the smoke temperature reaches a predetermined value, the fire damper 4 automatically closes and blocks to prevent the smoke with too high a temperature from directly entering the exhaust gas purification system.

[0026] In some examples, the activated carbon adsorption bed 14 can be an activated carbon adsorption bed arranged in sequence, and the activated carbon adsorption beds arranged in sequence make the adsorption rate of harmful gases such as organic pollutants higher, and the tops of the activated carbon adsorption beds are connected to the pipelines respectively. The top side of the activated carbon adsorption bed farthest from the catalytic bed 22 is also connected to the catalytic air outlet pipe 24, so that the catalyzed gas can be effectively cooled before being discharged.

[0027] In some examples, the air inlet of the pipe between the high-efficiency dry filter 13 and the activated carbon adsorption bed 14 can be set at the bottom of the activated carbon adsorption bed 14, and the top of the activated carbon adsorption bed 14 is connected to the pipe. The exhaust gas first starts to adsorb harmful gases such as organic pollutants from the bottom of the activated carbon adsorption bed 14, and then is discharged from the pipe connected to the top of the activated carbon adsorption bed 14, thereby increasing the exhaust gas adsorption area and improving the adsorption purification efficiency.

[0028] In some examples, the fire damper 4 is arranged on the air inlet duct 11, and may be near the inlet of the wet high-voltage electrostatic purifier 12 connected to the end of the air inlet duct 11, so that when the smoke comes out of the washing tower, the temperature of the smoke is reduced when it flows from the front end of the air inlet duct 11 into the end of the air inlet duct 11, and then passes through the fire damper 4 into the filtration adsorption system 10, which is beneficial to protect the filtration components of the adsorption filtration system 10 from being affected by excessively high temperatures.

[0029] Finally, it should be emphasized that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An exhaust gas purification system used in the plastic granulation industry, characterized by: The invention comprises a filtering and adsorption system (10) and a desorption catalytic system (20). The filtering and adsorption system (10) comprises an air inlet duct (11), a wet high-voltage electrostatic purifier (12), a high-efficiency dry filter (13), and an activated carbon adsorption bed (14). The air inlet duct (11), the wet high-voltage electrostatic purifier (12), the high-efficiency dry filter (13), and the activated carbon adsorption bed (14) are connected in sequence. The wet high-voltage electrostatic purifier (12) and the high-efficiency dry filter (13) respectively filter and adsorb particles of different diameters in the plastic fume waste gas. The desorption catalytic system (20) comprises a desorption air outlet pipe (21), a catalytic bed (22), a cooling fan (23), and a catalytic air outlet pipe (24); the desorption air outlet pipe (21) is arranged between the activated carbon adsorption bed (14) and the catalytic bed (22); the catalytic bed (22) is arranged between the desorption air outlet pipe (21) and the catalytic air outlet pipe (24); the catalytic air outlet pipe (24) is connected to the top of the catalytic bed (22); and the cooling fan (23) is arranged on the catalytic air outlet pipe (24) near the connection end between the catalytic bed (22) and the catalytic air outlet pipe (24).

2. The waste gas purification system for plastic granulation industry according to claim 1 is characterized in that: It comprises a system fan (5) and a chimney (6).

3. The waste gas purification system for plastic granulation industry according to claim 2 is characterized in that: The activated carbon adsorption beds (14) are arranged in sequence.

4. The waste gas purification system for plastic granulation industry according to claim 3 is characterized in that: The tops of the activated carbon adsorption beds are respectively connected to pipelines, and the side surface of the top of one of the activated carbon adsorption beds is connected to a catalytic air outlet pipe (24).

5. The waste gas purification system for plastic granulation industry according to claim 4 is characterized in that: The air inlet of the pipeline between the high-efficiency dry filter (13) and the activated carbon adsorption bed (14) is connected to the bottom of the activated carbon adsorption bed (14).

6. The waste gas purification system for plastic granulation industry according to claim 5 is characterized in that: It comprises a fire damper (4), which is used for detecting smoke temperature and preventing fire.

7. The waste gas purification system for plastic granulation industry according to claim 6 is characterized in that: The fire damper (4) is arranged on the air inlet duct (11), and is connected to the air inlet duct of the wet high-voltage electrostatic purifier (12) near the end of the air inlet duct (11).

8. The waste gas purification system for plastic granulation industry according to claim 7 is characterized in that: The top of the chimney (6) is provided with a chimney inspection port (7).

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