Low-temperature adsorption recovery device for chlorinated waste gas of petrochemical cracking device

Abstract

The utility model provides a kind of petrochemical cracking device chlorine-containing waste gas low-temperature adsorption recovery device, it is related to chlorine-containing waste gas recovery technical field, including absorption cylinder and washing tank, the bottom of absorption cylinder is provided with base, and the middle part of base is provided with liquid accumulation drain pipe, the lower end of liquid accumulation drain pipe is led into washing tank, and the middle part in washing tank is provided with filter screen frame, washing tank is equipped with lye, and the left part of washing tank is provided with waste gas inlet pipe, the upper portion of waste gas inlet pipe is connected with return pipe, return pipe is installed with suction pump in the upper portion, and the upper end of return pipe is connected on the left side surface upper portion of absorption cylinder, dehumidifier is installed in the lower part in absorption cylinder.The utility model first carries out lye washing to chlorine-containing waste gas, then in turn carries out dehumidification, drying, adsorption and purification treatment, and the gas after treatment can be recycled, which helps to improve the absorption rate of chlorine gas, so that the gas after treatment is cleaner and more complete, and the discharge is safe, reliable and environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of chlorine-containing waste gas recovery technology, specifically to a low-temperature adsorption and recovery device for chlorine-containing waste gas from a petrochemical cracking unit. Background Technology

[0002] Petrochemical cracking units are key equipment in the petrochemical industry used to crack petroleum feedstocks to obtain important chemical raw materials such as small-molecule hydrocarbons. The chemical process of petroleum cracking is quite complex, and the resulting cracked gas is a complex mixture containing not only unsaturated hydrocarbons such as ethylene, propylene, and butadiene, but also methane, ethane, hydrogen, and hydrogen sulfide, with a high olefin content. Separating the cracking products yields various desired raw materials. However, the waste gas produced by this unit contains chlorine, which is diffused into the air as a pollutant, causing economic losses and environmental pollution.

[0003] The description of a chlorine-containing electrolytic waste gas recovery and treatment device in the prior art (publication number CN107475746A) mentions that "the electrolytic chlorine generation tank includes an anode chamber and a cathode chamber, and also includes a chlorine circulation device installed above the electrolytic chlorine generation tank. The chlorine generated in the electrolytic chlorine generation tank is supplied to acidic electrolyzed water through the chlorine circulation device; the chlorine circulation device includes a gas capture device and a gas supply device. The gas capture device is connected to the anode chamber, and the gas supply device is connected to the acidic electrolyzed water solution." However, the waste gas treatment in the prior art is not clean, and chlorine residue is likely to occur, affecting the safety of the exhaust gas. It is not safe, reliable, or practical. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, a low-temperature adsorption and recovery device for chlorine-containing waste gas from petrochemical cracking units is provided. This device addresses the problems of incomplete waste gas treatment, chlorine residue, and compromised safety of exhaust gases in existing technologies, making them unsafe, unreliable, and impractical.

[0005] To achieve the above objectives, a low-temperature adsorption and recovery device for chlorine-containing waste gas from a petrochemical cracking unit is provided, comprising an absorption cylinder and a washing tank. The bottom of the absorption cylinder is provided with a base, and a liquid drainage pipe is provided in the middle of the base. The lower end of the liquid drainage pipe leads to the washing tank, and a filter screen is provided in the middle of the washing tank. The washing tank is filled with alkaline solution, and a waste gas inlet pipe is provided on the left side of the washing tank. A return pipe is connected to the upper part of the waste gas inlet pipe, and a vacuum pump is installed on the upper part of the return pipe. The upper end of the return pipe is connected to the upper left side of the absorption cylinder.

[0006] Furthermore, a dehumidifier is installed in the lower part of the absorption cylinder, and a guide plate is provided above the dehumidifier, and a heat conduction pipe is provided above the guide plate.

[0007] Furthermore, a mounting frame is fixed in the middle of the absorption cylinder, a turbine fan is installed under the mounting frame, a molecular sieve adsorption layer is installed in the upper part of the absorption cylinder, an activated carbon adsorption layer is set above the molecular sieve adsorption layer, and a precision filter layer is set above the activated carbon adsorption layer.

[0008] Furthermore, an exhaust pipe is provided at the top of the absorption cylinder, and an electromagnetic control valve is installed on the exhaust pipe.

[0009] Furthermore, a drain pipe is provided on the lower part of the front side of the washing tank, and a liquid inlet is provided on the upper part of the right side of the washing tank.

[0010] Furthermore, the right side of the absorption cylinder is connected to a right air supply pipe, and the lower end of the right air supply pipe leads to the upper part of the filter screen frame inside the washing tank, while the upper end of the right air supply pipe leads to the lower part of the absorption cylinder.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. The dehumidifier in this utility model can dehumidify the gas that is transported into the lower space of the absorption cylinder. After being softened and guided by the guide plate and dried by the heat pipe, the gas is then transported upward under the extraction condition of the turbine fan. It then passes through the molecular sieve adsorption layer and the activated carbon adsorption layer for large-area adsorption of chlorine gas, and then through the precision filtration layer for precision purification. The gas can then be drawn back through the return pipe and the air pump for circulation washing, dehumidification, drying, adsorption and purification, so that the discharged gas is cleaner.

[0013] 2. This utility model delivers chlorine-containing waste gas into the alkaline solution through the waste gas inlet pipe. After being washed by the alkaline solution, the gas is delivered to the lower space inside the absorption cylinder through the right gas delivery pipe to begin adsorption treatment. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model;

[0015] Figure 2 This is a left-side view of an embodiment of the present invention;

[0016] Figure 3 This is a top view schematic diagram of an embodiment of the present utility model;

[0017] Figure 4 This is a cross-sectional schematic diagram of an embodiment of the present utility model.

[0018] In the diagram: 1. Absorption cylinder; 10. Base; 11. Liquid drain pipe; 12. Dehumidifier; 13. Guide plate; 14. Heat pipe; 15. Turbine fan; 16. Mounting bracket; 17. Molecular sieve adsorption layer; 18. Activated carbon adsorption layer; 19. Precision filter layer; 100. Exhaust pipe; 101. Electromagnetic control valve; 2. Washing tank; 20. Filter frame; 21. Exhaust gas inlet pipe; 22. Alkali solution; 23. Right gas supply pipe; 24. Sewage outlet; 25. Liquid inlet pipe; 3. Return pipe; 30. Air pump. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Specific details, such as particular system structures and technologies, are provided to facilitate a more thorough understanding of the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments disclosed herein. However, those skilled in the art should understand that the present utility model can also be implemented in other embodiments without these specific details. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0020] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] Figure 1 This is a front view schematic diagram of an embodiment of the present utility model. Figure 2 This is a left-side view diagram of an embodiment of the present utility model. Figure 3 This is a top view schematic diagram of an embodiment of the present utility model and Figure 4 This is a cross-sectional schematic diagram of an embodiment of the present utility model.

[0022] Reference Figures 1 to 4 As shown, this utility model provides a low-temperature adsorption and recovery device for chlorine-containing waste gas from a petrochemical cracking unit, including an absorption cylinder 1 and a washing tank 2. A base 10 is provided at the bottom of the absorption cylinder 1, and a liquid drainage pipe 11 is provided in the middle of the base 10. The lower end of the liquid drainage pipe 11 leads into the washing tank 2, and a filter screen frame 20 is provided in the middle of the washing tank 2. The washing tank 2 is filled with alkaline solution 22, and a waste gas inlet pipe 21 is provided on the left side of the washing tank 2. A return pipe 3 is connected to the upper part of the waste gas inlet pipe 21, and a vacuum pump 30 is installed on the upper part of the return pipe 3. The upper end of the return pipe 3 is connected to the upper left side of the absorption cylinder 1.

[0023] In this embodiment, a dehumidifier 12 is installed in the lower part of the absorption cylinder 1, and a guide plate 13 is provided above the dehumidifier 12, and a heat conduction pipe 14 is provided above the guide plate 13; an exhaust pipe 100 is provided at the top of the absorption cylinder 1, and an electromagnetic control valve 101 is installed on the exhaust pipe 100; a mounting frame 16 is fixed in the middle of the absorption cylinder 1, a turbine fan 15 is installed under the mounting frame 16, and a molecular sieve adsorption layer 17 is installed in the upper part of the absorption cylinder 1, an activated carbon adsorption layer 18 is provided above the molecular sieve adsorption layer 17, and a precision filter layer 19 is provided above the activated carbon adsorption layer 18.

[0024] In a preferred embodiment, the dehumidifier 12 in this invention can dehumidify the gas that is conveyed into the lower space of the absorption cylinder 1. After being softened and guided by the guide plate 13 and dried by the heat pipe 14, the gas is then conveyed upward under the extraction condition of the turbine fan 15. It then passes through the molecular sieve adsorption layer 17 and the activated carbon adsorption layer 18 for large-area adsorption of chlorine gas, and then passes through the precision filter layer 19 for precision filtration and purification. The gas can then be drawn back through the return pipe 3 and the air pump 30 for circulation washing, dehumidification, drying, adsorption and purification, making the discharged gas cleaner.

[0025] In this embodiment, a drain pipe 24 is provided on the lower part of the front side of the washing tank 2, and an inlet pipe 25 is provided on the upper part of the right side of the washing tank 2; a right air supply pipe 23 is connected to the right part of the absorption cylinder 1, and the lower end of the right air supply pipe 23 leads to the upper part of the filter screen frame 20 inside the washing tank 2, and the upper end of the right air supply pipe 23 leads to the lower part of the absorption cylinder 1.

[0026] In a preferred embodiment, the present invention delivers chlorine-containing waste gas into the alkaline solution 22 through the waste gas inlet pipe 21. After being washed by the alkaline solution, the gas is delivered to the lower space inside the absorption cylinder 1 through the right gas delivery pipe 23 to begin adsorption treatment.

[0027] This invention effectively solves the problems of existing waste gas treatment methods, such as incomplete cleaning, chlorine residue, and compromised safety of exhaust gases. The invention first washes the chlorine-containing waste gas with alkaline solution, followed by dehumidification, drying, adsorption, and purification. The treated gas can be recycled, which helps improve the chlorine absorption rate, resulting in cleaner and more thorough treated gas with safe, reliable, and environmentally friendly emissions.

[0028] The above embodiments are used to explain and illustrate the present utility model, and not to limit the utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims should be included within the protection scope of the present utility model.

Claims

1. A low-temperature adsorption and recovery device for chlorine-containing waste gas from a petrochemical pyrolysis unit, characterized in that: The apparatus includes an absorption cylinder (1) and a washing tank (2). The bottom of the absorption cylinder (1) is provided with a base (10), and a liquid drain pipe (11) is provided in the middle of the base (10). The lower end of the liquid drain pipe (11) leads into the washing tank (2), and a filter screen frame (20) is provided in the middle of the washing tank (2). The washing tank (2) is filled with alkaline solution (22), and an exhaust gas inlet pipe (21) is provided on the left side of the washing tank (2). A return pipe (3) is connected to the upper part of the exhaust gas inlet pipe (21), and a vacuum pump (30) is installed on the upper part of the return pipe (3). The upper end of the return pipe (3) is connected to the upper left side of the absorption cylinder (1).

2. The device according to claim 1, characterized in that, A dehumidifier (12) is installed in the lower part of the absorption cylinder (1), and a guide plate (13) is provided above the dehumidifier (12), and a heat pipe (14) is provided above the guide plate (13).

3. The device according to claim 1, characterized in that, An installation frame (16) is fixed in the middle of the absorption cylinder (1). A turbine fan (15) is installed under the installation frame (16). A molecular sieve adsorption layer (17) is installed in the upper part of the absorption cylinder (1). An activated carbon adsorption layer (18) is provided above the molecular sieve adsorption layer (17). A precision filter layer (19) is provided above the activated carbon adsorption layer (18).

4. The device according to claim 1, characterized in that, The top of the absorption cylinder (1) is provided with an exhaust pipe (100), and an electromagnetic control valve (101) is installed on the exhaust pipe (100).

5. The device according to claim 1, characterized in that, The washing tank (2) has a drain outlet (24) at the lower front side and an inlet pipe (25) at the upper right side.

6. The device according to claim 1, characterized in that, The right side of the absorption cylinder (1) is connected to a right air supply pipe (23), and the lower end of the right air supply pipe (23) leads to the upper part of the filter screen frame (20) inside the washing tank (2), while the upper end of the right air supply pipe (23) leads to the lower part of the absorption cylinder (1).

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