Environment-friendly surface treatment device

Abstract

The utility model discloses a kind of surface treatment environmental protection devices, belong to hot zinc dust recycling technical field.The device is connected sequentially by suction port, annular negative pressure dust cover, main air pipe, cyclone separator, explosion-proof pulse dust collector, storage bin, passivation bin, weightless feeder and other components.The device collects zinc powder dust generated by hot zinc through negative pressure, realizes coarse and fine zinc powder grading recovery using cyclone separator;With the help of nitrogen valve and oxygen content sensor, a low-oxygen environment is maintained, explosion and oxidation are prevented;Then, the fine zinc powder is passivated and modified in the passivation bin, and finally, the recovered zinc powder and new zinc powder are mixed at a ratio of 5% to 30% by the weightless feeder, completing the closed-loop recycling.The device solves the problems of traditional equipment, such as easy explosion, severe zinc powder oxidation, limited mixing ratio, and low efficiency of manual collection.It is safe, environmentally friendly, and cost-effective, making it suitable for hot zinc surface treatment production lines.

Description

Technical Field

[0001] This utility model relates to the field of surface treatment, specifically to a device for recycling and utilizing waste gas and dust from thermal zinc spraying in the industrial production of surface treatment zinc spraying. Background Technology

[0002] In the surface treatment industry, thermal spraying zinc is a commonly used production process in China. During the thermal spraying zinc process, hazardous waste—zinc powder residue—is generated. Approximately 30%-50% of the zinc powder becomes waste due to rebound and scattering, increasing costs and posing an explosion risk due to dust accumulation. The residue mainly contains two substances: zinc powder and zinc oxide powder. Zinc powder is a highly valuable industrial product. According to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS), zinc powder is classified as a flammable solid and a substance harmful to the aquatic environment. In humid environments, it undergoes exothermic oxidation, posing a risk of explosion, and inhalation is extremely harmful to humans. Therefore, the recycling of zinc powder residue has significant economic and environmental benefits.

[0003] The main components of zinc powder coating are zinc powder and zinc oxide powder. Zinc spraying involves passing high-voltage self-current through two zinc wires to generate an electric spark, melting the zinc wires. The molten zinc is then atomized and sprayed out by a high-pressure airflow, adhering to the workpiece surface. During the spraying process, significant amounts of zinc powder are lost, resulting in low energy efficiency. With increasing global environmental protection requirements, the recycling of residual zinc powder will be widely adopted. Traditional baghouse dust collectors are prone to heat accumulation and explosions, and the recovered zinc powder is severely oxidized and cannot be directly reused. Furthermore, manual dust collection is inefficient; a remixing ratio greater than 10% can lead to a decrease in coating adhesion strength of more than 20%. Summary of the Invention

[0004] To solve the above problems, this utility model provides the following technical solution: a surface treatment environmental protection device, mainly comprising: an air intake, an annular negative pressure dust collection hood, a main air duct, a cyclone separator, a coarse zinc powder pipe, a reuse storage silo, a fine zinc powder pipe, an explosion-proof pulse dust collector, a nitrogen valve, a storage silo, an integrated oxygen content sensor, a passivation silo, a loss-in-weight feeder, and a pneumatic conveying pipe; characterized in that the air intake is located above the annular negative pressure dust collection hood and communicates with the interior of the annular negative pressure dust collection hood; the main air duct is installed below the annular negative pressure dust collection hood and communicates with the interior of the annular negative pressure dust collection hood; the main air duct and the cyclone separator... The top of the separator is connected to the main air duct, which communicates with the interior of the cyclone separator. One side of the bottom of the cyclone separator is connected to the coarse zinc powder pipeline, and the other side is connected to the fine zinc powder pipeline. The coarse zinc powder pipeline communicates with the interior of the recycling storage silo. The fine zinc powder pipeline communicates with the interior of the explosion-proof pulse dust collector. A nitrogen valve is installed on one side of the explosion-proof pulse dust collector. The explosion-proof pulse dust collector is connected to the storage silo via a pipeline. An oxygen content sensor is installed inside the storage silo. The storage silo is connected to the passivation silo via a pipeline, the passivation silo is connected to the loss-in-weight feeder pipeline, and the loss-in-weight feeder is connected to the pneumatic conveying pipeline.

[0005] A negative pressure is generated by the annular dust extraction hood. Dust escaping from the zinc spraying area enters the hood through the suction inlet. The dust then flows through the main duct into a cyclone separator, which captures coarse zinc powder larger than 30μm. Since zinc powder particles larger than 30μm typically have good flowability and can be directly used in certain spraying processes, the coarse zinc powder flows directly into the recycling storage silo through the coarse zinc powder pipe. Fine dust enters the explosion-proof dust collector through the fine zinc powder pipe. The fine zinc powder is filtered by an anti-static filter cartridge. After cleaning, the zinc powder falls into the explosion-proof dust collector, which maintains an oxygen concentration of <8% by purging with nitrogen through a nitrogen valve to prevent zinc powder explosion. The vibrating screen in the explosion-proof dust collector removes impurities such as substrate oxides larger than 100μm from the fine dust. After the fine zinc powder has been cleaned, it enters the storage silo through a pipeline. The storage silo stores the cleaned fine zinc powder. When the fine zinc powder is not needed for reuse, the storage silo valve is closed, and the zinc powder is stored in the silo. An integrated oxygen content sensor in the storage silo detects the oxygen concentration, and nitrogen is used to maintain the oxygen content <8%, thereby inhibiting the oxidation of the zinc powder. When the fine zinc powder needs to be reused, the storage silo valve is opened, and the fine zinc powder enters the passivation silo through a pipeline. A mixture of 10% CO2 and 90% N2 is introduced into the passivation silo to form a ZnCO3 film on the surface of the zinc powder, reducing its chemical activity. The oxidized zinc powder then enters the loss-in-weight feeder through a pipeline, where it is mixed with recycled powder and new zinc powder in a set ratio (5%-30%). The mixed powder is then conveyed to the spray gun powder feeder through a pneumatic conveying pipeline, completing the closed-loop reuse process.

[0006] Preferably, the annular negative pressure dust hood is model JSOG.

[0007] Preferably, the cyclone separator model is XFXF-500.

[0008] Preferably, the model of the reuse storage silo is yk9031.

[0009] Preferably, the explosion-proof pulse dust collector model is XFLT.

[0010] Preferably, the nitrogen valve model is YQD-6.

[0011] Preferably, the storage silo model is yk9031.

[0012] Preferably, the integrated oxygen content sensor model is YHG-01.

[0013] Preferably, the passivation chamber model is VPC-300.

[0014] The preferred model of the loss-in-weight feeder is KCM-XT50. Preferably, the pneumatic conveying pipeline is of ASTM A53 type. Compared with existing technologies, this invention recovers zinc powder residue generated during the thermal spraying process of zinc. The zinc powder residue is collected by a dust extraction device and then passivated and modified by introducing a 10% CO2 + 90% N2 mixture into the zinc powder, forming a ZnCO3 film on the surface and reducing its chemical activity. An automatic loss-in-weight feeder mixes the recovered powder with new zinc powder at a set ratio (5%-30%). The mixed powder is then transported to the spray gun feeder via a nitrogen-protected pipeline, completing a closed-loop reuse process. Attached Figure Description

[0015] Figure 1 This is a connection diagram for a utility model; Figure 1 The components are as follows: 1. Air intake, 2. Annular negative pressure dust collection hood, 3. Main air duct, 4. Cyclone separator, 5. Coarse zinc powder pipeline, 6. Fine zinc powder pipeline, 7. Recycled storage silo, 8. Explosion-proof pulse dust collector, 9. Nitrogen valve, 10. Storage silo, 11. Integrated oxygen content sensor, 12. Passivation silo, 13. Loss-in-weight feeder, 14. Pneumatic conveying pipeline. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides the following technical solution: a surface treatment environmental protection device, mainly comprising: an air intake, an annular negative pressure dust collection hood, a main air duct, a cyclone separator, a coarse zinc powder pipe, a reuse storage silo, a fine zinc powder pipe, an explosion-proof pulse dust collector, a nitrogen valve, a storage silo, an integrated oxygen content sensor, a passivation silo, a loss-in-weight feeder, and a pneumatic conveying pipe; characterized in that the air intake is located above the annular negative pressure dust collection hood and communicates with the interior of the annular negative pressure dust collection hood; the main air duct is installed below the annular negative pressure dust collection hood and communicates with the interior of the annular negative pressure dust collection hood; the main air duct is connected to the top of the cyclone separator. The main air duct is connected to the interior of the cyclone separator; one side of the bottom of the cyclone separator is connected to the coarse zinc powder pipeline, and the other side of the bottom of the cyclone separator is connected to the fine zinc powder pipeline; the coarse zinc powder pipeline is connected to the interior of the recycling storage silo; the fine zinc powder pipeline is connected to the interior of the explosion-proof pulse dust collector; a nitrogen valve is installed on one side of the explosion-proof pulse dust collector; the explosion-proof pulse dust collector is connected to the storage silo via a pipeline; an oxygen content sensor is installed inside the storage silo; the storage silo is connected to the passivation silo via a pipeline, the passivation silo is connected to the loss-in-weight feeder pipeline, and the loss-in-weight feeder is connected to the pneumatic conveying pipeline. Example

[0018] A negative pressure is generated by the annular dust extraction hood. Dust escaping from the zinc spraying area enters the hood through the suction inlet. The dust then flows through the main duct into a cyclone separator, which captures coarse zinc powder larger than 30μm. Since zinc powder particles larger than 30μm typically have good flowability and can be directly used in certain spraying processes, the coarse zinc powder flows directly into the recycling storage silo through the coarse zinc powder pipe. Fine dust enters the explosion-proof dust collector through the fine zinc powder pipe. The fine zinc powder is filtered by an anti-static filter cartridge. After cleaning, the zinc powder falls into the explosion-proof dust collector, which maintains an oxygen concentration of <8% by purging with nitrogen through a nitrogen valve to prevent zinc powder explosion. The vibrating screen in the explosion-proof dust collector removes impurities such as substrate oxides larger than 100μm from the fine dust. After the fine zinc powder has been cleaned, it enters the storage silo through a pipeline. The storage silo stores the cleaned fine zinc powder. When the fine zinc powder is not needed for reuse, the storage silo valve is closed, and the zinc powder is stored in the silo. An integrated oxygen content sensor in the storage silo detects the oxygen concentration, and nitrogen is used to maintain the oxygen content <8%, thereby inhibiting the oxidation of the zinc powder. When the fine zinc powder needs to be reused, the storage silo valve is opened, and the fine zinc powder enters the passivation silo through a pipeline. A mixture of 10% CO2 and 90% N2 is introduced into the passivation silo to form a ZnCO3 film on the surface of the zinc powder, reducing its chemical activity. The oxidized zinc powder then enters the loss-in-weight feeder through a pipeline, where it is mixed with recycled powder and new zinc powder in a set ratio (5%-30%). The mixed powder is then conveyed to the spray gun powder feeder through a pneumatic conveying pipeline, completing the closed-loop reuse process.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A surface treatment environmental protection device, mainly comprising: The components include: an air intake (1), an annular negative pressure dust collection hood (2), a main air duct (3), a cyclone separator (4), a coarse zinc powder pipe (5), a fine zinc powder pipe (6), a reuse storage silo (7), an explosion-proof pulse dust collector (8), a nitrogen valve (9), a storage silo (10), an integrated oxygen content sensor (11), a passivation chamber (12), a loss-in-weight feeder (13), and a pneumatic conveying pipe (14). The air intake (1) is located above the annular negative pressure dust collection hood (2) and communicates with the interior of the annular negative pressure dust collection hood (2). A main air duct (3) is installed below the annular negative pressure dust collection hood (2) and communicates with the interior of the annular negative pressure dust collection hood (2). The main air duct (3) is connected to the top of the cyclone separator (4), and the main air duct (3) is connected to the cyclone separator. (4) is internally connected; one side of the bottom of the cyclone separator (4) is connected to the coarse zinc powder pipe (5), and the other side of the bottom of the cyclone separator (4) is connected to the fine zinc powder pipe (6); the coarse zinc powder pipe (5) is internally connected to the reuse storage silo (7); the fine zinc powder pipe (6) is internally connected to the explosion-proof pulse dust collector (8); a nitrogen valve (9) is installed on one side of the explosion-proof pulse dust collector (8); the explosion-proof pulse dust collector (8) is connected to the storage silo (10) through a pipe; an oxygen content sensor (11) is installed in the storage silo (10); the storage silo (10) is connected to the passivation silo (12) through a pipe, the passivation silo (12) is connected to the loss-in-weight feeder (13) through a pipe, and the loss-in-weight feeder (13) is connected to the pneumatic conveying pipe (14).

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