Tail gas treatment device in deep processing process of coal tar

Abstract

The utility model belongs to the technical field of chemical equipment, and discloses a tail gas treatment device in a coal tar deep processing process, which comprises collecting and conveying equipment, a naphthalene washing tower, an alkaline washing tower, a water washing tower, a dry filter, an induced draft fan, a heat exchanger and a tubular furnace which are sequentially communicated through pipelines, pumps and valves, the naphthalene washing tower comprises a liquid storage section arranged at the bottom of a tower body, a middle reaction section filled with a Pall ring and a demisting section arranged at the top and provided with a demister, a spraying device is arranged in an inner cavity of the tower body between the reaction section and the demisting section, and the spraying device is communicated to a washing oil storage tank arranged outside the tower body through a pipeline. The waste gas treatment device ensures the waste gas treatment effect, protects equipment, reduces the economic burden of enterprises, realizes clean production, and is environment-friendly and safe.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a tail gas treatment device in the deep processing of coal tar. Background Art

[0002] Coal tar is an organic mixture primarily composed of aromatic hydrocarbons. Products such as phenol, xylenol, pyridine, refined naphthalene, anthraquinone, and carbazole, derived from deep processing of coal tar, serve as fundamental raw materials for the production of plastics, synthetic fibers, synthetic rubber, dyes, pesticides, pharmaceuticals, carbon, and organic fuels. They are also essential raw materials for industries such as metallurgy, building materials, chemicals, national defense, and food. Some polycyclic aromatic hydrocarbons are currently impossible to extract from petroleum. During the three-phase separation process in the tar centrifuge during deep processing, tar residue discharge emits odorous waste gases containing ammonia and hydrogen sulfide, as well as odorous gases generated by the operation of the tar centrifuge itself, seriously impacting the surrounding environment and personal safety. The existing treatment method is to directly transport the above-mentioned gases to a tubular furnace for treatment through collection and transportation equipment. However, because the above-mentioned gases contain a large amount of acidic and alkaline substances and a certain amount of naphthalene, the acidic and alkaline substances will corrode the tubular furnace and its subsequent treatment equipment, and the naphthalene will crystallize during the transportation process, which will cause blockage of the transportation pipeline over time. Therefore, these tail gases must be treated. Only after overcoming the above problems can the tail gases be transported to the tubular furnace for treatment. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a tail gas treatment device in the deep processing of coal tar, which overcomes the defects of the existing technology, removes naphthalene and harmful substances such as acid and alkalinity in the waste gas, and then preheats the waste gas before sending it into a tubular furnace for treatment, thereby ensuring the waste gas treatment effect, protecting equipment, reducing the economic burden of the enterprise, and realizing clean production, environmental protection and safety.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] A tail gas treatment device for deep processing of coal tar comprises a collection and transportation device, a naphthalene washing tower, an alkali washing tower, a water washing tower, a dry filter, an induced draft fan, a heat exchanger and a tubular furnace, which are sequentially connected through pipelines, pumps and valves; the naphthalene washing tower comprises a liquid storage section arranged at the bottom of the tower body, a reaction section in the middle filled with ball rings, and a demisting section at the top provided with a demister; a spray device is provided in the inner cavity of the tower body between the reaction section and the demisting section, and the spray device is connected to a wash oil storage tank arranged outside the tower body through a pipeline.

[0006] Preferably, the air outlet of the collecting and conveying equipment is connected to the air inlet of the naphthalene washing tower, the air outlet of the naphthalene washing tower is connected to the air inlet of the alkali washing tower, the air outlet of the alkali washing tower is connected to the air inlet of the water washing tower, the air outlet of the water washing tower is connected to the air inlet of the dry filter, the air outlet of the dry filter is connected to the air inlet of the induced draft fan, the air outlet of the induced draft fan is connected to the air inlet of the heat exchanger, and the air outlet of the heat exchanger is connected to the air inlet of the tubular furnace.

[0007] Preferably, the air inlet of the naphthalene washing tower is located at the bottom of the tower body, and the air outlet is located at the top of the tower body. Specifications of the naphthalene washing tower: XYAT-1.1, processing capacity: 11000m 3 / h, overall dimensions: φ2.2×8.0m, material: fiberglass; manufacturer is Weifang Xinyu Environmental Engineering Co., Ltd.

[0008] Preferably, the alkali scrubber is a packed tower, with a liquid storage section at the bottom, a reaction section in the middle (where waste gas and spray liquid fully contact, undergoing an acid-base neutralization reaction and being removed), and an atomization section at the top (where the alkaline spray liquid is atomized and sprayed downward). The air inlet of the alkali scrubber is located at the bottom of the tower, and the air outlet is located at the top. Waste gas enters the tower from the bottom, flows upward, and reacts with the alkaline spray liquid to remove acidic and harmful substances.

[0009] Alkali washing tower specification model: XYAT-1.1, processing capacity: 11000m 3 / h, overall dimensions: φ2.2×8.0m, material: fiberglass; manufacturer is Weifang Xinyu Environmental Engineering Co., Ltd.

[0010] Preferably, the water scrubber is a packed tower, with a liquid storage section at the bottom, a reaction section in the middle (where the waste gas and clean water fully contact and remove alkaline substances from the waste gas), and an atomization section at the top (where the clean water is atomized and sprayed downward). The air inlet of the water scrubber is located at the bottom of the tower, and the air outlet is located at the top. Waste gas enters the tower from the bottom, flows upward, and combines with the clean water in the reaction section to remove alkaline harmful substances.

[0011] Water washing tower specifications: XYAT-1.1, processing capacity: 11000m 3 / h, overall dimensions: φ2.2×8.0m, material: fiberglass; manufacturer is Weifang Xinyu Environmental Engineering Co., Ltd.

[0012] Preferably, the dry filter is equipped with several filter layers with varying performance levels, capable of intercepting fine particles such as water mist and dust from the exhaust gas, ensuring exhaust gas purity. The dry filter model is GSGL-2.0, and the manufacturer is Weifang Xinyu Environmental Engineering Co., Ltd.

[0013] Furthermore, the dry filter has an external dimension of about 2000×1700×1800 mm, and the box body is made of 304 stainless steel; it has two levels of fiber filter cotton layers built in, namely G4-level filter cotton and F7-level filter bag.

[0014] Furthermore, the dry filter is equipped with a differential pressure gauge, which can display the pressure drop of the equipment in real time, making it convenient to replace the filter cotton and filter bag in time.

[0015] Preferably, the model of the induced draft fan is BHF-8C-30kW; the manufacturer is Weifang Xinyu Environmental Engineering Co., Ltd.

[0016] Preferably, the heat exchanger is a water circulation heat exchanger. Model BEM1500×7762; manufacturer: Shandong Beichen Mechanical and Electrical Equipment Co., Ltd. Hot water output from other processes is introduced into the heat exchanger for heat exchange, fully utilizing waste heat generated during the production process to achieve energy conservation and consumption reduction.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] The utility model removes naphthalene in the tail gas by spraying washing oil in a naphthalene washing tower, thereby preventing the naphthalene in the tail gas from crystallizing and causing pipeline blockage during transportation; then removes harmful substances such as acid and alkalinity in the waste gas through an alkali washing tower and a water washing tower, and further intercepts fine particles such as water mist and dust in the waste gas through a dry filter, thereby ensuring the cleanliness of the waste gas; then preheats the pretreated waste gas through a heat exchanger and sends it into a tubular furnace for treatment, thereby ensuring the waste gas treatment effect, protecting equipment, reducing the economic burden of the enterprise, and realizing clean production, environmental protection and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the equipment flow of an embodiment of the utility model;

[0020] Figure 2 It is a schematic structural diagram of a naphthalene washing tower according to an embodiment of the present invention;

[0021] In the figure, 1. Collection and transportation equipment; 2. Naphthalene washing tower; 21. Liquid storage section; 22. Reaction section; 23. Demisting section; 24. Spraying device; 3. Alkali washing tower; 4. Water washing tower; 5. Dry filter; 6. Induced draft fan; 7. Heat exchanger; 8. Tubular furnace. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 and Figure 2As shown, a tail gas treatment device in the deep processing process of coal tar includes a collection and transportation equipment 1, a naphthalene washing tower 2, an alkali washing tower 3, a water washing tower 4, a dry filter 5, an induced draft fan 6, a heat exchanger 7 and a tubular furnace 8, which are connected in sequence through a pipeline (not shown), a pump (not shown) and a valve (not shown); the naphthalene washing tower 2 includes a liquid storage section 21 arranged at the bottom of the tower body, a reaction section 22 in the middle filled with a ball ring (not shown) and a demisting section 23 at the top provided with a demister (not shown), a spray device 24 is provided in the inner cavity of the tower body between the reaction section 22 and the demisting section 23, and the spray device 24 is connected to a wash oil storage tank (not shown) arranged outside the tower body through a pipeline.

[0024] In actual application, the odorous waste gas containing ammonia and hydrogen sulfide discharged during the discharge of tar residue during the three-phase separation process of the tar centrifuge and the odorous gas generated during the operation of the tar centrifuge workshop itself are collected by the collecting and conveying equipment 1 and conveyed to the naphthalene washing tower 2. The waste gas is input from the bottom of the naphthalene washing tower 2. During the rising process, it reacts with the washing oil sprayed from the spray device 24 in the tower in the ball ring of the reaction section 22. The washing oil absorbs the naphthalene in the waste gas and settles together in the liquid storage section 21; the waste gas continues to rise through the demisting section 23 provided with a demister and enters the alkali washing tower 3. The waste gas is input from the bottom of the alkali washing tower 3. During the rising process, it reacts with the spray liquid sprayed from the top of the tower. The reaction mainly occurs in the reaction section of the alkali washing tower 3. In the section, the acidic substances in the exhaust gas are removed by reaction; the treated gas is then transported to the water scrubber 4. The structure of the water scrubber 4 is the same as that of the alkali scrubber 3, except that the spray liquid is replaced by clean water. In this way, the gas to be treated reacts with the clean water in the reaction section to remove the alkaline substances in the exhaust gas; the treated gas then enters the dry filter 5 to further intercept fine particles such as water mist and dust in the gas, and then is transported to the heat exchanger 7 for preheating under the action of the induced draft fan 6. The preheated gas can then enter the tubular furnace 8 for treatment, thus completing the pretreatment process of the exhaust gas. The exhaust gas entering the tubular furnace 8 no longer contains naphthalene and acidic, alkaline and corrosive substances, thereby ensuring the effect of gas treatment and the safety of the equipment.

[0025] It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A tail gas treatment device in a coal tar deep processing process, characterized by: The invention comprises a collecting and conveying device, a naphthalene washing tower, an alkali washing tower, a water washing tower, a dry filter, an induced draft fan, a heat exchanger and a tubular furnace which are sequentially connected through pipelines, pumps and valves; the naphthalene washing tower comprises a liquid storage section arranged at the bottom of the tower body, a reaction section in the middle which is filled with ball rings, and a demisting section at the top which is provided with a demisting device; a spray device is provided in the inner cavity of the tower body between the reaction section and the demisting section, and the spray device is connected to a washing oil storage tank arranged outside the tower body through a pipeline.

2. The tail gas treatment device in the coal tar deep processing process according to claim 1, characterized in that: The air inlet of the naphthalene washing tower is arranged at the bottom of the tower body, and the air outlet is arranged at the top of the tower body.

3. The tail gas treatment device in the coal tar deep processing process according to claim 1, characterized in that: The alkali washing tower is a packed tower, the bottom of the tower body is a liquid storage section, the middle is a reaction section, and the top is an atomization section; the air inlet of the alkali washing tower is located at the bottom of the tower body, and the air outlet is located at the top of the tower body.

4. The tail gas treatment device in the coal tar deep processing process according to claim 1, characterized in that: The water washing tower is a packed tower, the bottom of the tower body is a liquid storage section, the middle is a reaction section, and the top is an atomization section; the air inlet of the water washing tower is located at the bottom of the tower body, and the air outlet is located at the top of the tower body.

5. The tail gas treatment device in the coal tar deep processing process according to claim 1, characterized in that: The dry filter is provided with several levels of filter layers.

6. The tail gas treatment device in the coal tar deep processing process according to claim 5, characterized in that: The dry filter is equipped with a differential pressure gauge.

7. The tail gas treatment device in the coal tar deep processing process according to claim 1, characterized in that: The heat exchanger is a water circulation heat exchanger.

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