A polyvinyl chloride waste gas collecting and processing device

Abstract

The utility model relates to a kind of polyvinyl chloride waste gas collection and treatment device in waste gas treatment technical field, including gas guide main pipe, the gas inlet end of gas guide main pipe is connected with multiple gas guide branch pipes, the gas outlet end of gas guide main pipe is connected with neutralization water pool, gas collecting hood is equipped on neutralization water pool, exhaust pipe is equipped on gas collecting hood, exhaust pipe is connected with absorption tower, induced draft fan is equipped on exhaust pipe, the spray head is equipped in the absorption tower, the spray head is connected with lye tank by liquid guide pipe, circulation pump is equipped on the liquid guide pipe, the bottom of absorption tower is equipped with liquid outlet pipe, on-off valve is equipped on the liquid outlet pipe, the liquid outlet pipe is connected with lye tank. The utility model can closed gas collection and processing, waste gas is introduced into treatment device in polyvinyl chloride production, avoids direct external discharge, after waste gas is neutralized and absorbed, discharge, reduce the security risk, reduce the harm to environment, conducive to production.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, specifically relating to a polyvinyl chloride waste gas collection and treatment device. Background Technology

[0002] In polyvinyl chloride (PVC) production, when determining a leak in a single converter, it is necessary to check the converter's acid and gas venting every hour. When the converter is depressurized, the acid vent is led into a temporary water tank, absorbing only hydrogen chloride, while acetylene and vinyl chloride are released into the atmosphere. These operations all result in the release of vinyl chloride, acetylene, and hydrogen chloride, causing environmental pollution. Waste alkali solution generated during alkali washing in the converter is discharged into the converter wastewater neutralization tank and neutralized with waste acid. The waste gas generated during neutralization is released into the atmosphere, constituting fugitive emissions and causing frequent alarms from nearby toxic gas detectors, posing a safety hazard. Furthermore, during converter drying, the acetylene and vinyl chloride adsorbed in the catalyst inside the converter continuously volatilize, leading to excessive VOCs in the exhaust drying gas, causing frequent alarms from nearby toxic gas detectors, also posing a safety hazard. Therefore, a PVC waste gas collection and treatment device is urgently needed to solve the above technical problems. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by providing a polyvinyl chloride (PVC) waste gas collection and treatment device, including a main gas guide pipe, an inlet end of which is connected to multiple branch gas guide pipes, an outlet end of which is connected to a neutralization tank, a gas collection hood on the neutralization tank, an exhaust pipe on the gas collection hood, an absorption tower connected to the exhaust pipe, an induced draft fan on the exhaust pipe, a spray head inside the absorption tower, an alkali solution tank connected to the spray head via a liquid guide pipe, a circulation pump on the liquid guide pipe, an outlet pipe at the bottom of the absorption tower, a switch valve on the outlet pipe, and the outlet pipe connected to the alkali solution tank.

[0004] Preferably, the air inlet end of the air guide branch is an upwardly inclined conduit with an inclination angle of 8-15°.

[0005] Preferably, the air guide branch pipe is equipped with a sight glass, and a plastic ball for observing airflow is placed inside the sight glass. An intercepting net one and an intercepting net two are sequentially fixed inside the sight glass along the airflow direction, with the plastic ball positioned between the two intercepting nets. The movement of the plastic ball is used to determine if there is any blockage in the pipeline, and the sight glass is used to determine if there is any leakage in the converter.

[0006] Preferably, the absorption tower is provided with a packing layer, which is located below the spray head.

[0007] Preferably, the absorption tower is equipped with a level gauge.

[0008] Preferably, the gas outlet pipe of the absorption tower is connected to an activated carbon tank, and the activated carbon tank is provided with an exhaust port. The gas discharged from the absorption tower is discharged into the air after being adsorbed by the activated carbon.

[0009] This utility model also includes other components that enable the normal operation of a polyvinyl chloride waste gas collection and treatment device, such as control components for the circulating pump, control components for the induced draft fan, control components for the switching valves, and control components for the level gauge, all of which are conventional technologies in the field. Furthermore, devices or components not specified in this utility model, such as the circulating pump, induced draft fan, plastic balls, spray heads, activated carbon tanks, level gauges, and switching valves, all employ conventional technologies and equipment in the field.

[0010] Working principle: Gas from the gas guide branch pipe enters the neutralization tank through the main gas guide pipe for acid-base neutralization. The gas generated by acid-base neutralization in the neutralization tank is collected by the gas collection hood above it and then sent into the absorption tower by the induced draft fan. The circulating pump sends the alkali solution from the alkali tank into the absorption tower, where it is sprayed out from the spray nozzles to further absorb and neutralize the gas. The gas discharged from the absorption tower enters the activated carbon storage tank for adsorption before being vented. The liquid in the spray tower can be recycled by the circulating pump.

[0011] This invention has the following advantages: it collects and treats gases in a closed system, introducing waste gases such as acetylene, vinyl chloride, and hydrogen chloride emitted from the converter during polyvinyl chloride production, which are released during depressurization and drying, into the treatment device. This avoids direct external discharge, and the waste gases are neutralized and absorbed before being released, reducing safety risks, minimizing environmental harm, and benefiting production. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of a polyvinyl chloride waste gas collection and treatment device in an embodiment of this utility model; Figure 2 This is a schematic diagram of the inclined angle structure of the catheter in Example 1; Figure 3 This is a schematic diagram of the sight glass on the air duct in Example 2.

[0014] In the diagram: 1. Converter; 2. Gas branch pipe; 3. Gas main pipe; 4. Neutralization tank; 5. Gas collection hood; 6. Exhaust fan; 7. Absorption tower; 8. Alkali tank; 9. Circulating pump; 10. Gas outlet pipe; 11. Sight glass; 12. Interception net two; 13. Liquid guide pipe; 14. Interception net one; 15. Plastic ball; 16. Switch valve; 17. Liquid level gauge; 18. Packing layer; 19. Exhaust pipe; 20. Liquid outlet pipe; 21. Conduit. Detailed Implementation

[0015] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0016] Example 1 like Figure 1-2 As shown, this utility model provides a polyvinyl chloride (PVC) waste gas collection and treatment device, including a main gas guide pipe 3 (DN50). The inlet end of the main gas guide pipe 3 is connected to multiple branch gas guide pipes 2 (DN50). The inlet ends of the branch gas guide pipes 2 are respectively connected to the gas phase outlet of the corresponding PVC production process (e.g., the acid discharge point at the bottom of converter 1, the pressure relief point of the converter, or the converter drying gas discharge point). The outlet ends of the branch gas guide pipes 2 are connected to the main gas guide pipe 3. The outlet end of the main gas guide pipe 3 is connected to a neutralization water tank 4. The absorption tower is equipped with a gas collecting hood 5, an exhaust pipe 19, and an absorption tower 7. An induced draft fan 6 (model: BG-J80A) is mounted on the exhaust pipe 19. A spray head is installed inside the absorption tower 7, and the spray head is connected to an alkali solution tank 8 via a liquid guide pipe 13. A circulating pump 9 (model: Q=50m³ / hH=32mN=7.5kW) is mounted on the liquid guide pipe 13. An outlet pipe 20 is located at the bottom of the absorption tower 7, and a switch valve 16 is mounted on the outlet pipe 20, which is connected to the alkali solution tank 8.

[0017] The inlet end of the gas guide branch pipe 2 is an upwardly inclined conduit 21 with an inclination angle of 10°. The inlet end of the conduit connects to the acid discharge point of the converter. The inlet end of the conduit is at the lower end, a feature designed to prevent internal leakage from the acid discharge valve of a single converter. Opening the acid discharge manual valve (model: DN50 valve) at the acid discharge point allows the mixed gas to pass sequentially through the gas guide branch pipe and the main gas guide pipe before entering the neutralization tank for neutralization. The gas guide branch pipe 2 is equipped with a sight glass 11, and the sight glass 11 contains a plastic ball 15 for observing the airflow, which is used to determine whether the acid release pipe is blocked.

[0018] The absorption tower 7 is equipped with a packing layer 18 (packing material: corrugated packing), which is located below the spray head.

[0019] The absorption tower 7 is equipped with a level gauge 17 (magnetic float level gauge: measuring length 2000mm, DN25PN10).

[0020] The gas outlet pipe 10 of the absorption tower 7 is connected to an activated carbon tank, and the activated carbon tank is provided with an exhaust port. The gas discharged from the absorption tower 7 is discharged into the air after being adsorbed by the activated carbon.

[0021] In this embodiment, each gas guide branch pipe is connected to the gas phase outlet of the converter depressurization and drying discharge points in the PVC production process. The acetylene, vinyl chloride, hydrogen chloride, and other waste gases discharged from each process are introduced into the main gas guide pipe and then into the neutralization tank for acid-base neutralization. The gas generated by acid-base neutralization in the neutralization tank is collected by the gas collection hood above it and then sent into the absorption tower by an induced draft fan. A circulating pump sends the alkali solution from the alkali tank into the absorption tower, where it is sprayed from the spray nozzles to further absorb and neutralize the gas. The gas discharged from the absorption tower enters the activated carbon storage tank for adsorption before being vented. The liquid in the spray tower can be recycled by the circulating pump. This achieves effective treatment of waste gas, reduces safety hazards and environmental pollution, improves the production environment, and eliminates fugitive emissions.

[0022] Example 2 like Figure 1-3 As shown, the difference between this embodiment and embodiment 1 is that, inside the viewing mirror 11, interception net one 14 and interception net two 12 are fixed in sequence along the airflow direction, and the plastic ball 15 is located between interception net one 14 and interception net two 12.

[0023] Example 3 like Figure 1-3 As shown, the difference between this embodiment and embodiment 1 is that the air inlet end of the air guide branch pipe 2 is an upwardly inclined conduit 21 with an inclination angle of 8°.

[0024] Example 4 like Figure 1-3 As shown, the difference between this embodiment and embodiment 1 is that the air inlet of the air guide branch pipe 2 is an upwardly inclined conduit 21 with an inclination angle of 15°.

[0025] The polyvinyl chloride waste gas collection and treatment device in the above-mentioned implementation example involves an induced draft fan, circulating pump, packing layer, level gauge, sight glass, activated carbon tank, spray head, etc., which are all existing technologies. This application does not make any improvements to them, but only utilizes their existing functions. For their specific structure and principle, please refer to the product manual or existing technical data, which are all existing technologies.

[0026] The embodiments of this utility model have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A polyvinyl chloride (PVC) waste gas collection and treatment device, comprising a main gas guide pipe, characterized in that: The main gas inlet is connected to multiple branch gas inlets, and the outlet of the main gas inlet is connected to a neutralization tank. A gas collection hood is installed on the neutralization tank, and an exhaust pipe is installed on the gas collection hood. The exhaust pipe is connected to an absorption tower, and an induced draft fan is installed on the exhaust pipe. A spray head is installed inside the absorption tower, and the spray head is connected to an alkali tank through a liquid guide pipe. A circulation pump is installed on the liquid guide pipe, and an outlet pipe is installed at the bottom of the absorption tower. A switch valve is installed on the outlet pipe, and the outlet pipe is connected to the alkali tank.

2. The polyvinyl chloride waste gas collection and treatment device according to claim 1, characterized in that: The air inlet of the air guide branch is an upwardly inclined conduit with an inclination angle of 8-15°.

3. The polyvinyl chloride waste gas collection and treatment device according to claim 2, characterized in that: The air guide branch is equipped with a sight glass, and the sight glass contains a plastic ball for observing the airflow.

4. The polyvinyl chloride waste gas collection and treatment device according to claim 1, characterized in that: The absorption tower is equipped with a packing layer, which is located below the spray head.

5. The polyvinyl chloride waste gas collection and treatment device according to claim 1, characterized in that: The absorption tower is equipped with a level gauge.

6. The polyvinyl chloride waste gas collection and treatment device according to claim 1, characterized in that: The gas outlet pipe of the absorption tower is connected to an activated carbon tank.

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