Treatment equipment based on pet feed production waste gas

Abstract

The utility model relates to treatment equipment based on pet feed production waste gas. Comprising a waste gas collecting device used for blowing waste gas collected by connecting pipelines of air outlets of a conditioner, a drying device, a cooling device, a belt conveyor dehumidification device, a pre-drying device and a pneumatic conveying device to a waste gas collecting box through a stainless steel pipeline under positive pressure; the waste gas treatment system is used for treating waste gas collected in the waste gas collection box and comprises a gravity dust removal device, a water mist dust removal device, a filter screen pretreatment device and a low-temperature plasma treatment device which are connected in sequence; and the discharging device is used for discharging the treated waste gas through a high exhaust funnel with a preset meter number. The whole operation cost is low, the operation cost of an enterprise can be remarkably reduced in the long-term operation process, and economic benefits are improved. The device is high in impact load resistance, can adapt to fluctuation changes of waste gas flow and pollutant concentration in the pet feed production process, always keeps a stable treatment effect, and ensures that the waste gas reaches the standard and is discharged.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment, and in particular to a treatment device for waste gas from pet food production. Background Technology

[0002] In the pet food production industry, waste gas treatment is a crucial step in ensuring a safe production environment and product quality. Currently, common environmental protection equipment such as cyclone dust collectors, baghouse dust collectors, UV photo-oxidation systems, and activated carbon presents numerous problems when applied to pet food production lines. For example, cyclone dust collectors, baghouse dust collectors, UV photo-oxidation systems, and activated carbon are sometimes unsuitable for use in pet food production line environmental protection systems.

[0003] Different processing combinations also have their own advantages and disadvantages in terms of market operation and maintenance:

[0004] 1. Cyclone dust collector + bag filter + activated carbon combination (negative pressure type)

[0005] This combination offers certain cost advantages in initial procurement, resulting in relatively low investment costs. However, its operation and maintenance costs are high, with the total operating and maintenance expenses remaining at a high level annually, leading to persistently high long-term operating costs. Furthermore, during actual production, malfunctions in production equipment can negatively impact product quality, potentially causing product contamination or decreased production efficiency.

[0006] 2. Baghouse dust collector + activated carbon combination (negative pressure type)

[0007] This combination is similar to the aforementioned cyclone dust collector + bag filter + activated carbon combination, and is also a negative pressure type. While its procurement costs are relatively low, its operation and maintenance costs are high, resulting in higher annual operating and maintenance expenses. Furthermore, it faces similar issues regarding the impact of production equipment operation on product quality; malfunctions in the production equipment can affect product quality, posing potential risks to production.

[0008] 3. PP spray tower + UV photo-oxidation combination (negative pressure type)

[0009] Its initial procurement cost is relatively low, making it economically attractive. However, in terms of operation and maintenance, not only are the costs high, but there are also serious safety hazards, such as the risk of short circuits and leakage, which makes its safe application quite challenging. In actual use, more effort and resources are needed to ensure the safe operation of the equipment; otherwise, safety accidents may occur, causing damage to personnel and production facilities.

[0010] 4. Stainless steel spray system + low-temperature plasma combination (positive pressure type)

[0011] The significant advantage of this combination lies in its lower operating and maintenance costs, with relatively low annual operating and maintenance expenses, while ensuring the normal operation of production equipment and positively impacting the stability of the production process. However, its high initial investment costs require companies to invest a significant amount of capital in equipment procurement initially, which can be a substantial burden for companies with limited funds, thus restricting its widespread application in the market.

[0012] 5. Stainless steel spray system + activated carbon combination (positive pressure type)

[0013] The initial investment for this system is relatively high, requiring companies to invest significant funds during the equipment purchase phase. While maintenance costs are not particularly high, the moisture content in the exhaust gas gradually reduces the adsorption capacity of the activated carbon. As usage time increases, the treatment effect deteriorates, necessitating more frequent activated carbon replacement, further increasing operating costs and potentially affecting compliance with emission standards.

[0014] In summary, the existing waste gas treatment combinations have varying degrees of problems in terms of cost, safety, equipment operational stability, and the durability of treatment effects. They are unable to fully meet the requirements of high efficiency, economy, safety, and stability in pet food production waste gas treatment, and a more optimized solution is urgently needed. Summary of the Invention

[0015] In view of this, the purpose of this utility model is to provide a treatment device for waste gas from pet food production, so as to solve the relevant technical problems existing in the prior art.

[0016] According to a first aspect of the present invention, a treatment device for pet food production waste gas is provided, characterized in that it comprises:

[0017] The exhaust gas collection device is used to collect the exhaust gas collected from the exhaust ports of various equipment such as conditioners, dryers, coolers, belt conveyors, dehumidifiers, pre-dryers, and pneumatic conveyors through stainless steel pipes and blow it under positive pressure to the exhaust gas collection box.

[0018] The exhaust gas treatment system is used to treat the exhaust gas collected in the exhaust gas collection box, and includes a gravity dust removal device, a water mist dust removal device, a filter pretreatment device and a low temperature plasma treatment device connected in sequence.

[0019] The gravity dust removal device utilizes the difference in specific gravity between dust and gas to allow large dust particles to settle naturally.

[0020] The water mist dust removal device brings the dust-laden gas into contact with water mist, causing the dust to be adsorbed or moistened by the water and then settle.

[0021] The filter pretreatment device removes dust through sieving, inertial force, and thermal motion.

[0022] The low-temperature plasma treatment device uses an external voltage to break down the gas and generate low-temperature plasma, in which high-energy electrons, free radicals and other active particles interact with pollutants in the waste gas to decompose the pollutant molecules and cause subsequent reactions.

[0023] And, an exhaust device for discharging the treated exhaust gas through a pre-set high exhaust stack.

[0024] Furthermore, the worn dust-blocking curtain can be adjusted or replaced after the filter pretreatment device has been running for a period of time.

[0025] Furthermore, the low-temperature plasma treatment device is equipped with a shutdown control device at both the front and rear, which can control the interruption of plasma discharge according to the ignition point or air volume.

[0026] Furthermore, the exhaust gas treatment system housing is housed within a metal casing with flame-retardant and explosion-proof properties.

[0027] Furthermore, the high exhaust pipe of the emission device, with a preset length, discharges at a distance of 25 meters or more from the ground.

[0028] Furthermore, the device also includes:

[0029] The water circulation device is used to collect, filter, and recycle the pre-set spray water. The collected water is transported to the spray device by a circulation pump. During the spraying process, the water comes into full contact with the exhaust gas, absorbs some of the pollutants in the exhaust gas, and then falls into the bottom water collection tank. The water in the water collection tank is filtered by a filter screen to remove impurities, and then pumped back to the spray device for recycling by the circulation pump, which effectively saves water resources and improves treatment efficiency.

[0030] The technical solutions provided by the embodiments of this utility model may include the following beneficial effects:

[0031] 1. By utilizing the shutdown control devices equipped before and after the plasma treatment system, precise control can be achieved based on the ignition point or air volume, and the plasma discharge can be interrupted in a timely manner. This greatly enhances the system's automatic safety control capability, effectively avoids potential combustion and explosion accidents, and ensures the safety of equipment operation and the surrounding environment.

[0032] 2. The system unit housing and the entire unit are enclosed in a metal shell with flame-retardant and explosion-proof properties, providing comprehensive protection at the hardware level. This ensures that even in extreme circumstances, potential dangers can be effectively contained and the spread of flames and explosion waves can be prevented.

[0033] 3. Precise analysis of the concentration of various factors in the exhaust gas during the design phase ensures that it remains below the flammability and explosion limits, eliminating the risk of flammability and explosion at the source. This makes the entire exhaust gas treatment process safe and worry-free, and can be confidently applied to pet food production environments.

[0034] 4. The unique "dust removal + three-stage water spray + low-temperature plasma treatment" system forms a powerful, coordinated force. Gravity dust removal, water mist dust removal, and filter pretreatment work in tandem to comprehensively and deeply remove particulate matter from the exhaust gas. Gravity dust removal utilizes the density difference between dust and gas to initially settle large dust particles; water mist dust removal further purifies the gas through the contact adsorption of dust by water; and filter pretreatment uses various physical processes to precisely intercept tiny particles, ensuring that the particulate matter content in the exhaust gas entering the subsequent low-temperature plasma treatment stage is extremely low.

[0035] 5. The low-temperature plasma treatment stage utilizes high-energy electrons and free radicals generated by an applied voltage to react violently with pollutants in the waste gas, decomposing large molecular pollutants into smaller, safer substances or reducing their toxicity, thereby achieving deep purification of gaseous pollutants. Through this series of treatment steps, the waste gas can be comprehensively and efficiently treated, ultimately meeting emission standards, effectively protecting the surrounding environment, and complying with environmental protection requirements.

[0036] 6. Low operating costs: It can significantly reduce operating costs and improve economic efficiency for enterprises during long-term operation. Its strong resistance to shock loads allows it to adapt to fluctuations in exhaust gas flow and pollutant concentration during pet food production, maintaining stable treatment results and ensuring that exhaust gas emissions meet standards.

[0037] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present invention. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0039] Figure 1 This is a schematic diagram illustrating the composition of a treatment device for exhaust gas from pet food production, according to an exemplary embodiment.

[0040] Figure 2 This is a schematic diagram illustrating the overall process of a treatment device for waste gas from pet food production, according to an exemplary embodiment. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0042] Example 1

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating the composition of a treatment device for pet food production waste gas according to an exemplary embodiment, the device comprising:

[0044] Waste gas collection device 1 is used to blow the waste gas collected from the exhaust ports of various equipment such as conditioner, dryer, cooler, belt conveyor dehumidifier, pre-dryer, and pneumatic conveyor to the waste gas collection box through a stainless steel pipe under positive pressure.

[0045] The exhaust gas treatment system 2 is used to treat the exhaust gas collected in the exhaust gas collection box, and includes a gravity dust removal device, a water mist dust removal device, a filter pretreatment device and a low temperature plasma treatment device connected in sequence.

[0046] The gravity dust removal device utilizes the difference in specific gravity between dust and gas to allow large dust particles to settle naturally.

[0047] The water mist dust removal device brings the dust-laden gas into contact with water mist, causing the dust to be adsorbed or moistened by the water and then settle.

[0048] The filter pretreatment device removes dust through sieving, inertial force, and thermal motion.

[0049] The low-temperature plasma treatment device uses an external voltage to break down the gas and generate low-temperature plasma, in which high-energy electrons, free radicals and other active particles interact with pollutants in the waste gas to decompose the pollutant molecules and cause subsequent reactions.

[0050] And, emission device 3, for discharging the treated exhaust gas through a high exhaust stack of a preset length.

[0051] In practical implementation, it also includes: a water circulation device, which is used to collect, filter and recycle the preset spray water. The collected water is transported to the spray device by a circulation pump. During the spraying process, the water comes into full contact with the exhaust gas, absorbs some of the pollutants in the exhaust gas and falls into the bottom water collection tank. The water in the water collection tank is filtered by a filter screen to remove impurities and then pumped back to the spray device for recycling by the circulation pump, which effectively saves water resources and improves treatment efficiency.

[0052] In practical implementation, the pipes connecting the exhaust ports of the conditioner, dryer, cooler, belt conveyor dehumidifier, pre-dryer, and pneumatic conveyor in the exhaust gas collection device 1 are made of stainless steel, which has good corrosion resistance and can adapt to the erosion of various chemicals and humid gases that may exist in the pet food production environment, ensuring the long-term stable operation of the pipes.

[0053] Furthermore, the diameter of the pipes should be rationally designed based on the exhaust gas flow rate of each equipment's exhaust port. This design must ensure smooth collection of exhaust gas to avoid pipe blockage, while also considering economic costs and space layout. For example, for the exhaust ports of drying equipment with a large exhaust gas flow rate, a larger diameter pipe, such as 200-300mm, can be used; while for the exhaust ports of belt conveyor dehumidification equipment with a relatively small exhaust gas flow rate, the pipe diameter can be designed to be 100-150mm.

[0054] Pipeline connections utilize either flanges or welding for superior sealing, ensuring no gas leakage at the joints. At flange connections, high-temperature and corrosion-resistant gaskets, such as graphite gaskets, are used to further enhance the seal. Welded areas undergo rigorous weld inspection to guarantee weld quality and prevent gas leakage due to weld defects.

[0055] Furthermore, positive pressure conveying is powered by a fan, and the fan selection is determined based on the total waste gas collection volume and conveying resistance of the entire system. For example, a centrifugal fan is selected, which features large air volume and high pressure, and can meet the requirements of conveying waste gas from the exhaust ports of each piece of equipment to the waste gas collection box. The fan's air volume can be selected based on 1.2-1.5 times the total exhaust volume of all equipment to ensure sufficient margin to cope with possible changes in operating conditions.

[0056] The fan is installed in a suitable location, usually at the front or middle of the exhaust gas collection duct, to facilitate the extraction of exhaust gases generated by various devices. The fan and the duct are connected by a flexible connection, such as a rubber expansion joint, which can reduce the impact of fan vibration on the duct system and ensure the sealing of the connection.

[0057] Regulating valves, such as butterfly valves or gate valves, are installed at the air inlet and outlet of the fan to regulate the air volume and air pressure. During system startup, the air volume can be gradually increased by adjusting the valves to ensure stable system operation. During operation, the valve openings are adjusted in real time based on the operating status of each device and the amount of waste gas generated to optimize waste gas collection.

[0058] It should be noted that the exhaust gas collection box is made of stainless steel, and the box body has sufficient strength and rigidity to withstand a certain positive pressure without deformation. The volume of the box is determined according to the exhaust gas collection volume and residence time requirements. Generally, the residence time is designed to be 10-30 seconds to ensure that the exhaust gas has a certain buffering and initial separation time within the collection box.

[0059] Furthermore, in specific implementation, the dust removal process of the exhaust gas treatment system 2 mainly includes the following steps:

[0060] 1. Gravity Dust Collection: When exhaust gas enters the gravity dust collection area, based on the principle that dust and gas have different specific gravities, large dust particles naturally settle to the bottom of the collection device under the influence of gravity. During this process, the dust collection effect can be optimized by adjusting the airflow velocity and the structural parameters of the dust collection area (such as height and cross-sectional area).

[0061] 2. Water Mist Dust Removal: After gravity dust removal, the exhaust gas enters the water mist dust removal stage. A fine water mist is sprayed into the exhaust gas through a pre-set spray device, ensuring full contact between the dust-laden gas and the water mist. Dust particles collide with the water mist, are adsorbed or moistened, increasing their weight and causing them to settle further. The nozzle design and water mist parameters (such as droplet size and spray volume) of the spray device can be adjusted according to the characteristics of the exhaust gas and the treatment requirements.

[0062] 3. Filter Pretreatment: The exhaust gas then passes through the filter pretreatment device. The filter uses a combination of filter media with different pore sizes and materials, utilizing sieving, inertial force, and thermal motion to remove dust. Dust particles larger than the filter media gaps are directly trapped; larger dust particles are captured due to inertial force colliding with the filter media when the airflow changes direction; lighter dust particles are captured because their movement direction is changed by collisions with gas molecules, increasing their chance of contact with the fibers. During operation, the filter screen clogging should be checked regularly. After a period of operation (the time interval should be determined according to actual working conditions), worn dust-blocking curtains should be adjusted or replaced promptly to ensure dust removal efficiency.

[0063] 4. Low-temperature plasma treatment

[0064] After dust removal, the exhaust gas enters the low-temperature plasma treatment zone. In this zone, an external voltage is applied via a high-voltage power supply, causing the gas to break down and generate low-temperature plasma. The generated high-energy electrons, free radicals, and other active particles undergo a series of complex physicochemical reactions with the pollutants in the exhaust gas. For example, the chemical bonds in pollutant molecules are broken by high-energy electrons, decomposing them into simpler small molecules; free radicals combine with pollutant molecules, causing structural changes and transforming them into harmless or low-toxic substances. During the treatment process, parameters such as the applied voltage and the frequency of the plasma generator are adjusted according to the composition and concentration of the exhaust gas to achieve the best treatment effect.

[0065] In one embodiment, the worn dust-blocking curtain can be adjusted or replaced after the filter pretreatment device has been running for a period of time.

[0066] In one embodiment, the low-temperature plasma treatment device is equipped with a shutdown control device before and after it, which can control the interruption of plasma discharge according to the ignition point or air volume.

[0067] In one embodiment, the exhaust gas treatment system 2 is housed within a metal casing with flame-retardant and explosion-proof properties.

[0068] In one embodiment, the high exhaust pipe of the emission device 3, with a preset length, discharges at a distance of 25 meters or more from the ground.

[0069] In one embodiment, the qualified gas, after low-temperature plasma treatment, is conveyed to an exhaust stack via a fan. The exhaust stack is 13.5m high (≥25m above the ground) to ensure that the emitted exhaust gas can fully diffuse in the atmosphere. The exhaust stack is also made of stainless steel, which has good corrosion resistance and structural strength. A gas monitoring device can be installed at the exhaust stack outlet to monitor the quality of the emitted gas in real time and ensure compliance with environmental emission standards.

[0070] Please see Figure 2 In practice, the main steps include:

[0071] I. Waste Gas Collection

[0072] In the pet food production process, waste gas from various equipment such as conditioners, dryers, coolers, belt conveyors for dehumidification, pre-drying, and pneumatic conveying is connected to a waste gas collection box via pipelines. These pipelines are made of stainless steel and utilize positive pressure conveying to ensure that the waste gas is effectively collected into the collection device.

[0073] II. Preliminary Treatment

[0074] Gravity and water mist dust removal:

[0075] Gravity dust removal: The collected exhaust gas first enters the gravity dust removal stage. Based on the principle that dust and gas have different specific gravities, large dust particles are separated from the gas by natural settling, thus initially removing larger dust particles from the exhaust gas.

[0076] Water mist dust removal: Next, the exhaust gas enters the water mist dust removal stage. The dust-laden gas is guided to fully contact with the water mist. After the dust is adsorbed or moistened by the water, it settles due to gravity, further removing dust from the exhaust gas and improving its cleanliness.

[0077] Filter pretreatment:

[0078] The exhaust gas, after being filtered by gravity and water mist, undergoes further pretreatment through a filter. Filter pretreatment utilizes principles such as sieving, inertial force, and thermal motion for dust removal. For example, when dust particles are larger than the gaps between the filter media, they are trapped on the filter screen; larger dust particles are captured due to inertial impacts on the filter media; lighter dust particles have their trajectories altered by collisions with gas molecules, increasing the probability of contact with the fibers and thus being captured. After a period of operation, the worn dust-blocking curtains need to be adjusted or replaced to ensure the filter's dust removal efficiency.

[0079] III. Deep Processing

[0080] Low-temperature plasma treatment:

[0081] After the initial dust removal process, the exhaust gas enters the low-temperature plasma equipment under the action of a fan. An applied voltage causes the gas to break down, forming low-temperature plasma. During this process, high-energy electrons, free radicals, and other active particles in the low-temperature plasma interact with the pollutants in the exhaust gas, promoting the decomposition of pollutant molecules and subsequent reactions, transforming complex macromolecular pollutants into simple, safe small-molecule substances or reducing their toxicity.

[0082] Then, the exhaust gas enters the low-temperature plasma neutralization reaction zone for further reaction, allowing the exhaust gas to be treated more thoroughly.

[0083] IV. Compliant Emissions

[0084] After the above series of treatments, the exhaust gas becomes neutralized and meets the standards, and is finally discharged into the atmosphere through a 25-meter-high chimney, ensuring that the exhaust gas emissions meet environmental protection standards and reducing pollution to the environment.

[0085] Throughout the treatment process, a water circulation system is installed to collect, filter, and recycle the water used for spraying. The collected water is pumped to the spraying device via a circulation pump. After the water fully contacts the exhaust gas and absorbs pollutants, it falls into a bottom collection tank. The water in the collection tank is then filtered through a screen to remove impurities before being pumped back to the spraying device for reuse. This saves water resources and improves the efficiency and effectiveness of exhaust gas treatment. Simultaneously, the exhaust gas treatment system incorporates multiple safety measures, such as the spraying system reducing exhaust gas concentration to below the lower explosive limit, shutdown control devices before and after the plasma treatment system, and the system unit casing and generator encapsulation in flame-retardant and explosion-proof metal housings, ensuring the safety and stability of equipment operation. Throughout the entire exhaust gas treatment process, the connecting pipes between various equipment and stages must be well-sealed to prevent exhaust gas leakage. Furthermore, a corresponding control system is installed to monitor and regulate the operating parameters of equipment such as fans, spraying devices, and plasma generators in real time, ensuring stable and efficient system operation. For example, the fan speed is automatically adjusted based on the exhaust gas flow rate, and the spray volume and plasma treatment intensity are adjusted based on the exhaust gas concentration and treatment effect. In addition, the equipment is regularly maintained and inspected, and damaged or aging parts, such as fan blades, spray nozzles, and plasma generator electrodes, are replaced in a timely manner to extend the service life of the equipment and ensure the stability of the treatment effect.

[0086] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0087] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means at least two.

[0088] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the present invention pertain.

[0089] It should be understood that the various parts of this utility model can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0090] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0091] Furthermore, the functional units in the various embodiments of this utility model can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0092] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pet food production exhaust gas treatment device based on , comprising: a waste gas collecting device for collecting waste gas from the exhaust ports of the conditioner, drying, cooling, belt conveyor dehumidification, pre-drying, and pneumatic conveying devices through stainless steel pipes and blowing the waste gas into a waste gas collecting tank under positive pressure; a waste gas treatment system for treating the waste gas collected in the waste gas collecting tank, comprising a gravity dust removal device, a water mist dust removal device, a filter screen pretreatment device, and a low-temperature plasma treatment device connected in sequence; wherein the gravity dust removal device utilizes the different specific gravities of dust and gas to make large-particle dust naturally settle; the water mist dust removal device makes dust-containing gas contact with water mist to make the dust be adsorbed or wetted by water and then settle; the filter screen pretreatment device removes dust through screening, inertial force, and thermal motion; the low-temperature plasma treatment device utilizes an applied voltage to make gas break down to generate low-temperature plasma, wherein high-energy electrons and free radical active particles react with pollutants in the waste gas to make the pollutants decompose and undergo subsequent reactions; and 2. The pet food production exhaust gas treatment apparatus according to claim 1, wherein an exhaust device for discharging the treated waste gas through a high exhaust pipe with a preset number of meters.

3. The pet food production exhaust gas treatment apparatus according to claim 1, wherein The filter screen pretreatment device can adjust or replace the worn dust-blocking soft curtain after a period of operation.

4. The pet food production exhaust gas treatment apparatus according to claim 1, wherein The low-temperature plasma treatment device is provided with a shutdown control device before and after it, which can control the interruption of plasma discharge according to the ignition point or air volume.

5. The pet food production exhaust gas treatment apparatus according to claim 1, wherein The shell of the waste gas treatment system is placed in a metal shell with flame-retardant and explosion-proof properties.

6. The pet food production exhaust gas treatment apparatus according to claim 1, wherein The high exhaust pipe in the exhaust device has a discharge distance from the ground of greater than or equal to 25 meters. The device further comprises: a water circulation device for collecting, filtering, and recycling the preset spraying water, and delivering the collected water to the spraying device through a circulating pump, wherein in the spraying process, the water fully contacts with the waste gas, absorbs part of the pollutants in the waste gas, and then falls into a bottom water collecting tank, the water in the water collecting tank is filtered to remove impurities through a filter screen, and then is pumped back to the spraying device for recycling, thereby effectively saving water resources and improving treatment efficiency.

Images