Tail gas treatment device for process of preparing phthalic anhydride flaking and packaging by naphthalene method

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a naphthalene method phthalic anhydride flaking and packaging process tail gas treatment device which comprises air suction ports of air suction pipelines arranged at the tops of a flaking machine and a packaging machine, and the air suction pipelines are sequentially communicated with a filter, a bag-type dust collector, a wet dust collector and a fan through pipelines from the air suction ports. And the other end of the fan is also communicated with a chimney. The phthalic anhydride flaking and packaging device can solve the problem of dust generated during phthalic anhydride flaking and packaging operation, and ensures the safety of a production environment.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to a tail gas treatment device for the naphthalene-based phthalic anhydride flake and packaging process. Background Technology

[0002] In existing naphthalene-based phthalic anhydride production processes, industrial naphthalene is preheated by a naphthalene heater before entering a naphthalene evaporator. The naphthalene vapor, along with preheated air, is thoroughly mixed in a vaporizer before entering a reactor where it undergoes an oxidation reaction under the action of a catalyst, yielding phthalic anhydride and byproducts naphthoquinone and maleic anhydride. After leaving the reactor, the reaction product gas is first cooled by a gas cooler and then condensed by a condenser to obtain crude phthalic anhydride. The purified liquid phthalic anhydride is then cooled and condensed into flakes by a flake-forming machine. The flakes are scraped off by a scraper and then conveyed to a packaging machine for packaging. This process generates phthalic anhydride dust. Some of this dust settles near the equipment, while some disperses into the surrounding air. Current treatment methods simply involve filtering and collecting this dust, but the dust concentration in the air remains above 10 mg / Nm³. 3 Furthermore, it causes a strong odor in the environment and fails to meet environmental protection requirements. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a tail gas treatment device for the phthalic anhydride flake and packaging process of naphthalene method, which overcomes the defects of the prior art, can solve the dust problem generated during phthalic anhydride flake and packaging operations, and ensure the safety of the production environment.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A tail gas treatment device for the naphthalene-based phthalic anhydride flake and packaging process includes an air intake port on the top of the flake and packaging machines. The air intake port is connected in sequence to a filter, a bag filter, a wet scrubber, and a fan. The other end of the fan is also connected to a chimney.

[0006] Preferably, the filter is a coarse filter with an air inlet at the bottom and an air outlet at the top; the coarse filter has three layers of filter screens inside.

[0007] Preferably, the filter is model GLQ-30-304 and manufactured by Weifang Aipu Environmental Protection Equipment Co., Ltd.

[0008] Preferably, the bag filter contains 36 cylindrical filter bags. An air inlet is located on one side of the middle section of the bag filter, and an air outlet is located on the other side. The bag filter is model CCQ-10-304 and is manufactured by Weifang Aipu Environmental Protection Equipment Co., Ltd.

[0009] Preferably, the wet scrubber is equipped with water mist nozzles, which are connected to an external water supply device via pipes; a water collection device is provided at the bottom of the wet scrubber. An air inlet is located on one side of the bottom of the wet scrubber, and an air outlet is located at the top; the model of the wet scrubber is WSC-5000-304, and the manufacturer is Weifang Aipu Environmental Protection Equipment Co., Ltd.

[0010] Preferably, the fan is model 4-72NO6C and manufactured by Weifang Aipu Environmental Protection Equipment Co., Ltd.

[0011] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0012] This invention uses a fan to first extract the dust-containing exhaust gas generated during the flake formation and packaging processes to a filter for filtration. Then, the exhaust gas is passed through a bag filter and a wet scrubber for dust removal. Finally, the fan transports the treated and qualified exhaust gas to a chimney for discharge. The entire process is simple, efficient, and the treated environment is safe.

[0013] In summary, this invention can solve the problems of phthalic anhydride flakes and dust generated during packaging operations, ensuring a safe production environment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the equipment process according to an embodiment of the present utility model;

[0015] In the diagram, 1 is a sheeter; 2 is a packaging machine; 3 is an air intake; 4 is a filter; 5 is a bag filter; 6 is a wet scrubber; 7 is a fan; and 8 is a chimney. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, a tail gas treatment device for the phthalic anhydride flake and packaging process using the naphthalene method includes an air intake 3 (not shown) installed on the top of the flake machine 1 and the packaging machine 2. The air intake duct is connected in sequence from the air intake 3 to a filter 4, a bag filter 5, a wet scrubber 6 and a fan 7. The other end of the fan 7 is also connected to a chimney 8.

[0018] In actual production, the dusty exhaust gas generated during the flake formation and packaging of phthalic anhydride is drawn into filter 4 through suction port 3 and the negative pressure generated by fan 7. The exhaust gas enters from the bottom inlet of filter 4, and the internal mesh structure of filter 4 (the filter device is divided into three layers) filters out large particles in the exhaust gas. The filtered exhaust gas exits from the top outlet of filter 4 and enters bag filter 5. Bag filter 5 contains 36 cylindrical filter bags. After the dusty gas enters bag filter 5 from the inlet on one side of the middle part of bag filter 5, the exhaust gas containing impurities is separated due to gravity. The gas settles down under the force and falls into the ash hopper. When the gas containing fine dust passes through the filter material, the dust is trapped, thus purifying the gas, which then exits from the outlet in the middle of the other side. The purified exhaust gas continues to enter the wet scrubber 6 from the inlet at the bottom. Inside the wet scrubber 6, the nozzles spray water mist from top to bottom to capture the remaining dust particles, further removing fine particulate matter and soluble pollutants from the gas. The treated exhaust gas meets the emission standards and enters the fan 7 from the outlet at the top of the wet scrubber 6, and then enters the chimney 8 for discharge.

[0019] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A tail gas treatment device for the phthalic anhydride flake production and packaging process using the naphthalene method, characterized in that: The system includes an air intake port on the air intake pipe located at the top of the sheeter and the packaging machine. The air intake pipe connects sequentially to a filter, a bag filter, a wet scrubber, and a fan. The other end of the fan is also connected to a chimney.

2. The tail gas treatment device for the phthalic anhydride flake and packaging process according to claim 1, characterized in that: The filter is a coarse filter with an air inlet at the bottom and an air outlet at the top; the coarse filter has three layers of filter screens inside.

3. The tail gas treatment device for the phthalic anhydride flake and packaging process according to claim 1, characterized in that: The bag filter contains 36 cylindrical filter bags.

4. The tail gas treatment device for the phthalic anhydride flake and packaging process according to claim 1, characterized in that: The wet dust collector is equipped with water mist nozzles, which are connected to an external water supply device via pipes; a water collection device is located at the bottom of the wet dust collector.

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