Phthalic anhydride tail gas collecting device

Abstract

The utility model provides a phthalic anhydride tail gas collecting device which comprises a gas collecting pipeline communicated with an emission source, an accelerating pipeline arranged at the upper part of the gas collecting pipeline and used for increasing the flow rate of gas introduced through the gas collecting pipeline, a first filtering disc arranged at the lower part of the accelerating pipeline, and a second filtering disc arranged at the upper part of the accelerating pipeline, according to the utility model, waste gas generated by an emission source can be guided into the acceleration pipeline for acceleration after being filtered by the first filter disc through the gas collection pipeline, and the accelerated waste gas subjected to preliminary filtration is filtered by the second filter disc and enters the purification tower for efficient purification treatment; according to the waste gas treatment device, the waste gas collection efficiency is greatly improved, and the problem that the waste gas treatment efficiency is reduced due to the fact that in most traditional waste gas treatment, particle impurities are not filtered and directly extracted through a fan, and the particle impurities in the waste gas can impact and damage fan blades of the fan or even adhere to the fan blades of the fan is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas collection equipment, in particular to a phthalic anhydride tail gas collection device. Background Art

[0002] Phthalic anhydride tail gas primarily originates from the production of phthalic anhydride (PhA), particularly when produced using the naphthalene process, where the tail gas composition is particularly complex. The PHA production process produces tail gas containing volatile organic compounds (VOCs), dust, and potentially harmful gases such as sulfur dioxide and nitrogen oxides. If discharged untreated, these tail gases can cause severe atmospheric pollution and pose health risks.

[0003] Phthalic anhydride is an important organic chemical raw material, widely used in chemical, pharmaceutical, electronic, agricultural, coating, fine chemical and other industrial sectors.

[0004] Phthalic anhydride tail gas has a complex composition, containing N₂, O₂, CO, CO₂, SO₂, small amounts of phthalic anhydride, maleic anhydride, naphthoquinone, benzoic acid, phthalide, and inert gases. Direct discharge of phthalic anhydride tail gas can cause severe environmental damage. Under new standards, phthalic anhydride tail gas urgently needs to be treated to meet emission standards, and its treatment is receiving increasing attention.

[0005] Exhaust gas collection refers to the use of specific technologies and equipment to collect harmful or harmless exhaust gases emitted during production for further treatment, purification, or utilization. This process is a key component of environmental protection and resource recovery, particularly in industries such as chemical, pharmaceutical, and petroleum refining.

[0006] Most traditional waste gas collection and treatment processes do not filter out particulate impurities and rely directly on fan extraction. The particulate impurities in the waste gas will collide with and damage the fan blades or even adhere to the fan blades, reducing the waste gas collection and treatment efficiency. Utility Model Content

[0007] In view of this, the utility model provides a phthalic anhydride tail gas collection device, which can accelerate the pipeline and cooperate with the filtering effect of the first filter disc and the second filter disc to solve the problem that most traditional waste gas collection treatments do not filter particulate impurities and rely directly on fan extraction. Particulate impurities in the exhaust gas will collide with and damage the fan blades or even adhere to the fan blades, reducing the collection and treatment efficiency of the exhaust gas.

[0008] In order to solve the above technical problems, the utility model provides a phthalic anhydride tail gas collection device, including a gas collecting pipe connected to the emission source, the upper part of the gas collecting pipe is provided with an acceleration pipe for increasing the flow rate of the gas introduced through the gas collecting pipe, the lower part of the acceleration pipe is provided with a first filter disc, the upper part of the acceleration pipe is provided with a second filter disc, and the upper part of the acceleration pipe is connected to the inlet of the purification tower. The utility model can filter the exhaust gas generated by the emission source through the first filter disc through the gas collecting pipe and then guide it into the acceleration pipe for acceleration. The exhaust gas that has been initially filtered after acceleration will be filtered by the second filter disc and enter the purification tower for efficient purification treatment, which greatly improves the collection efficiency of the exhaust gas, is more efficient and energy-saving, and solves the problem that most traditional exhaust gas treatments do not filter particulate impurities and directly rely on fan extraction. Particulate impurities in the exhaust gas will collide with and damage the fan blades or even adhere to the fan blades, thereby reducing the exhaust gas treatment efficiency.

[0009] The accelerating pipe is a venturi tube, which includes a convergent pipe, a throat pipe and a diffuser arranged in sequence from bottom to top. A guide pipe is provided on the side wall of the convergent pipe, and the other end of the guide pipe is connected to the inlet of the adsorption tower.

[0010] A first mounting groove is provided on the flange at the tapered lower portion, and the first filter disc is clamped in the first mounting groove. A second mounting groove is provided on the upper portion of the diffusion pipe, and the second filter disc is clamped in the second mounting groove.

[0011] The flange on the upper part of the gas gathering pipe and the flange on the lower part of the reducer are connected together by bolts and nuts.

[0012] The flange ends at the upper and lower ends of the gas gathering pipeline are both provided with sealing gaskets, which should be made of non-slip, wear-resistant and high-temperature resistant rubber material.

[0013] The throat pipe and the diffuser are integrally formed, and a flange at the lower portion of the throat pipe and a flange at the upper portion of the reducer are detachably connected together by bolts and nuts.

[0014] In summary, compared with the prior art, this application has at least one of the following beneficial technical effects:

[0015] 1. The utility model can filter the exhaust gas generated by the emission source through the first filter disc through the gas collection pipe and then guide it into the acceleration pipe for acceleration. The exhaust gas that has been initially filtered after acceleration will be filtered through the second filter disc and enter the purification tower for efficient purification treatment, which greatly improves the collection efficiency of the exhaust gas and is more efficient and energy-saving. It solves the problem that most traditional exhaust gas treatments do not filter particulate impurities and directly rely on fan extraction. Particulate impurities in the exhaust gas will collide with and damage the fan blades or even adhere to the fan blades, reducing the exhaust gas treatment efficiency.

[0016] 2. The structural characteristics of the Venturi tube are that the entrance is wide, narrows in the middle, and then expands again. When the exhaust gas passes through the narrow part, according to the Bernoulli principle, a low-pressure area will be generated in the narrow part. This low-pressure area can effectively inhale and accelerate the surrounding exhaust gas or harmful gas, thereby realizing efficient gas transmission operations. The utility model can improve the gas capture and transmission efficiency through the Venturi tube without significantly increasing energy consumption, and has a high energy efficiency ratio.

[0017] 3. The sealing gasket should be made of non-slip, wear-resistant and high-temperature resistant rubber material. The sealing gasket can greatly enhance the sealing performance of the gas collection pipe and the Venturi tube, avoid unnecessary dissipation of untreated exhaust gas, and make the operation safer and more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a phthalic anhydride tail gas collection device according to the present invention;

[0019] Figure 2 This is a side view of the phthalic anhydride tail gas collection device of the utility model;

[0020] Figure 3 For this utility model Figure 2 Sectional view at AA in the figure.

[0021] Explanation of the reference numerals: 100, gas collecting pipe; 200, accelerating pipe; 210, tapering pipe; 211, guide pipe; 212, first mounting groove; 220, throat pipe; 230, diffuser pipe; 231, second mounting groove; 300, first filter disc; 400, second filter disc. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiment of the present invention clearer, the following will be combined with the appended drawings of the embodiment of the present invention. Figure 1-3 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of the present invention.

[0023] like Figure 1-3As shown: This embodiment provides a phthalic anhydride tail gas collection device, including a gas collecting pipe 100 connected to the discharge port of the emission source, an acceleration pipe 200 is provided on the upper part of the gas collecting pipe 100 for increasing the flow rate of the gas introduced through the gas collecting pipe 100, a first filter disc 300 is provided at the lower part of the acceleration pipe 200, and a second filter disc 400 is provided at the upper part of the acceleration pipe 200. The cooperation of the first filter disc 300 and the second filter disc 400 can realize multi-stage and efficient filtering of particulate impurities in the exhaust gas, greatly improving the purity of the exhaust gas entering the purification tower. The upper part of the acceleration pipe 200 is connected to the inlet of the purification tower, and the purification tower is used to purify the exhaust gas and remove the exhaust gas. The harmful substances in the exhaust gas, the odorous water or chemical absorption liquid in the purification tower are mainly used to remove acidic gases or other soluble pollutants in the exhaust gas. The utility model can filter the exhaust gas generated by the emission source through the first filter disc 300 through the gas collecting pipe 100 and then guide it to the acceleration pipe 200 for acceleration. The exhaust gas that has been initially filtered after acceleration will be filtered through the second filter disc 400 and enter the purification tower for efficient purification treatment, which greatly improves the collection efficiency of the exhaust gas and is more efficient and energy-saving. It solves the problem that most traditional exhaust gas treatments do not filter particulate impurities and rely directly on fan extraction. Particulate impurities in the exhaust gas will collide with and damage the fan blades or even adhere to the fan blades, reducing the exhaust gas treatment efficiency.

[0024] According to one embodiment of the present invention, Figure 1-3 As shown, the accelerating pipe 200 is a venturi tube, which includes a reducer 210, a throat 220 and a diffuser 230 arranged in sequence from bottom to top. The throat 220 and the diffuser 230 are integrally formed, and the flange at the lower part of the throat 220 and the flange at the upper part of the reducer 210 are detachably connected together by bolts and nuts. A guide pipe 211 is provided on the side wall of the reducer 210, and the other end of the guide pipe 211 is connected to the inlet of the adsorption tower. The adsorption tower is provided with activated carbon or other adsorption material to capture It can capture organic matter in exhaust gas and is mainly used to adsorb sulfides in exhaust gas. The structural characteristics of the venturi tube are wide inlet, narrowing in the middle, and then expanding again. When the exhaust gas passes through the narrow part, according to the Bernoulli principle, a low-pressure area will be generated at the narrow part. This low-pressure area can effectively inhale and accelerate the surrounding exhaust gas or harmful gas, and realize efficient gas transmission operation. The utility model can improve the gas capture and transmission efficiency through the venturi tube without significantly increasing energy consumption, and has a high energy efficiency ratio.

[0025] According to another embodiment of the present invention, Figure 1 and Figure 3As shown, a first mounting groove 212 is provided on the tapered lower flange, and the first filter disc 300 is clamped in the first mounting groove 212. A second mounting groove 231 is provided on the upper part of the diffusion tube 230, and the second filter disc 400 is clamped in the second mounting groove 231. The utility model can filter the particulate impurities in the exhaust gas introduced into the acceleration pipe 200 through the gas collecting pipe 100 through the first filter disc 300, and then enter the acceleration pipe 200 for acceleration, and realize secondary filtration of the particulate impurities in the accelerated exhaust gas that pass through the mesh of the first filter disc 300 through the second filter disc 400, which greatly reduces the content of particulate impurities in the exhaust gas entering the purification tower, thereby improving the collection and treatment efficiency of the exhaust gas.

[0026] According to another embodiment of the present invention, Figure 1 and Figure 2 As shown, the upper flange of the gas collecting pipe 100 and the lower flange of the reducer 210 are connected together by bolts and nuts. The purpose of this is to facilitate the rapid disassembly and installation of the gas collecting pipe 100 and the acceleration pipe 200, making the operation more convenient.

[0027] The flange ends at the upper and lower ends of the gas collecting pipe 100 are both provided with sealing gaskets. The sealing gaskets should be made of non-slip, wear-resistant and high-temperature resistant rubber material. The sealing gaskets can greatly enhance the sealing performance of the gas collecting pipe 100 and the Venturi tube, avoid unnecessary dissipation of untreated exhaust gas, and make the operation safer and more environmentally friendly.

[0028] The use method of this utility model:

[0029] First of all, it should be made clear that the collection device involved in the present invention is mainly used to collect and preliminarily treat the waste gas generated by the emission source and guide it to the equipment in the purification tower. The present invention takes the preliminary treatment of phthalic anhydride tail gas as an example to explain its use method in detail. When it is necessary to collect phthalic anhydride tail gas, the waste gas generated by the emission source will go upward into the gas collecting pipe 100 connected thereto. Before entering the gas collecting pipe 100, the waste gas will be filtered by the first filter disc 300 for particles in the waste gas. The waste gas after preliminary filtration passes through the air guide pipe into the adsorption tower for treatment, and the other way is accelerated upward through the acceleration pipe 200 and then passes through the second filter disc. After filtration by 400, the exhaust gas is accelerated and discharged into the purification tower for purification treatment. The utility model can filter the exhaust gas generated by the emission source through the first filter disc 300 through the gas collecting pipe 100 and then guide it into the acceleration pipe 200 for acceleration. The exhaust gas that has been initially filtered after acceleration will be filtered through the second filter disc 400 and enter the purification tower for efficient purification treatment, which greatly improves the collection efficiency of the exhaust gas and is more efficient and energy-saving. It solves the problem that most traditional exhaust gas treatments do not filter particulate impurities and rely directly on fan extraction. Particulate impurities in the exhaust gas will collide with and damage the fan blades or even adhere to the fan blades, reducing the exhaust gas treatment efficiency.

[0030] Furthermore, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0031] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A phthalic anhydride tail gas collection device, comprising a gas collection pipeline (100) connected to an emission source, characterized in that: The upper portion of the gas collecting pipe (100) is provided with an acceleration pipe (200) for increasing the flow rate of the gas introduced through the gas collecting pipe (100), the lower portion of the acceleration pipe (200) is provided with a first filter disc (300), the upper portion of the acceleration pipe (200) is provided with a second filter disc (400), and the upper portion of the acceleration pipe (200) is connected to the inlet of the purification tower.

2. The phthalic anhydride tail gas collecting device as claimed in claim 1, wherein: The accelerating pipe (200) is a venturi tube, which comprises a convergent pipe (210), a throat pipe (220) and a diffuser (230) arranged in sequence from bottom to top. A guide pipe (211) is provided on the side wall of the convergent pipe (210), and the other end of the guide pipe (211) is connected to the inlet of the adsorption tower.

3. The phthalic anhydride tail gas collecting device as claimed in claim 2, wherein: A first mounting groove (212) is provided on the flange at the tapered lower portion, and the first filter disc (300) is clamped in the first mounting groove (212). A second mounting groove (231) is provided on the upper portion of the diffusion tube (230), and the second filter disc (400) is clamped in the second mounting groove (231).

4. The phthalic anhydride tail gas collecting device as claimed in claim 3, wherein: The upper flange of the gas collecting pipe (100) and the lower flange of the reducer (210) are connected together by bolts and nuts.

5. The phthalic anhydride tail gas collecting device as claimed in claim 4, wherein: The flange ends at the upper and lower ends of the gas collecting pipe (100) are both provided with sealing gaskets.

6. The phthalic anhydride tail gas collecting device as claimed in claim 5, wherein: The throat pipe (220) and the diffuser pipe (230) are integrally formed, and a flange at the bottom of the throat pipe (220) and a flange at the top of the reducer pipe (210) are detachably connected together by bolts and nuts.

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