Tail gas washing device of succinic anhydride rectification system

Abstract

The utility model discloses a tail gas washing device of a succinic anhydride rectification system, which belongs to the field of tail gas washing and comprises a liquid storage tank, a support fixedly connected onto the liquid storage tank, a base fixedly connected with the bottom of the support, a washing mechanism arranged at the top of the liquid storage tank, a cooling pipe fixedly connected into the liquid storage tank, and a gas inlet pipe fixedly connected onto the liquid storage tank. The washing mechanism comprises a multi-section washing tower, and the inner wall of the bottom of the washing tower is fixedly connected with a dispersion cover. The tail gas washing device has the beneficial effects that the power mechanism and the separation mechanism are arranged, the tail gas below the dispersion cover can be pressurized by wind power through rotation of blades, the tail gas can be dispersed on the bottom surface of the dispersion cover and can uniformly pass through all through holes, the tail gas washing effect is improved, succinic anhydride in the cooled tail gas can be solidified, and the tail gas can be separated. A first filter screen is arranged to prevent succinic anhydride from continuing to participate in circulation of the washing liquid, solid succinic anhydride is collected into a collecting box under the action of a scraper, and waste is reduced.

Description

Technical Field

[0001] The utility model relates to the field of tail gas washing, in particular to a tail gas washing device for a succinic anhydride rectification system. Background Technique

[0002] Succinic anhydride, also known as amber acid anhydride, is an organic compound with the chemical formula C4H4O3, a melting point of 118 - 120 °C, and is a white crystalline powder at room temperature. It is slightly soluble in water and ether, and soluble in chloroform, carbon tetrachloride, and ethanol. Industrially, tail gas is generated after rectifying succinic anhydride. These tail gases contain substances such as maleic anhydride, γ-butyrolactone, and succinic anhydride. Among them, succinic anhydride has an irritating odor, γ-butyrolactone is flammable and has low toxicity hazards, and maleic anhydride has a strong irritating odor. If directly discharged without treatment, it will cause environmental pollution. Secondly, it will also cause waste of useful chemical substances such as residual succinic anhydride and γ-butyrolactone in the tail gas. The reaction tail gas needs to be treated before being discharged.

[0003] After retrieval, Chinese Patent Publication No. CN218130946U discloses a tail gas washing device for a succinic anhydride rectification system. The patent includes a liquid storage tank and a washing tower connected in series from bottom to top. A jacket is provided on the outer wall of the liquid storage tank, and a spiral tube is provided inside the jacket. The lower port of the spiral tube extends below the jacket, and the upper port is connected to the bottom of the washing tower. A plurality of washing components are provided inside the washing tower, and each washing component includes a packing layer and a washing spray head. A spraying component is provided inside the washing tower above the washing component. The spraying component includes a gas gathering cone and an upper gas pipe. The upper end of the upper gas pipe is blocked, and a plurality of gas distribution pipes are circumferentially and evenly distributed on the pipe wall of the upper gas pipe. An atomizing spray head is provided above the upper gas pipe. An exhaust port is provided at the top of the washing tower. The device has a compact structure, a high waste heat recovery rate, and good washing effect. However, for the existing tail gas washing device of a succinic anhydride rectification system, the tail gas is discharged from one place of the washing tower, which affects the uniform contact between the washing liquid and the tail gas, and means for dispersing the tail gas are required. Moreover, the residual succinic anhydride in the tail gas will form solid powder after cooling, and it needs to be collected to prevent it from participating in the circulation of the washing liquid and affecting the washing effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a tail gas washing device for a succinic anhydride rectification system to solve the above problems.

[0005] The utility model realizes the above purpose through the following technical solutions:

[0006] An exhaust gas washing device for a succinic anhydride rectification system, comprising a liquid storage tank, a support is fixedly connected to the liquid storage tank, a base is fixedly connected to the bottom of the support, a washing mechanism is arranged at the top of the liquid storage tank, a cooling pipe is fixedly connected inside the liquid storage tank, an air inlet pipe is fixedly connected to the liquid storage tank, the washing mechanism includes a multi-section washing tower, a dispersion cover is fixedly connected to the inner wall of the bottom of the washing tower, a circulation mechanism is installed on the liquid storage tank and the washing tower, the circulation mechanism includes a circulation pipe, the circulation pipe communicates from the bottom of the washing tower to the middle position of the washing tower, a washing spray head is fixedly installed at the water outlet end of the circulation pipe, a power mechanism is arranged inside the liquid storage tank, the power mechanism includes a motor, the motor is fixedly connected to the base, a rotating shaft is fixedly connected to the output end of the motor, a blade is fixedly connected to the top of the rotating shaft, a separation mechanism is arranged inside the liquid storage tank, and the separation mechanism is used to separate residual succinic anhydride in the washing liquid;

[0007] The separation mechanism includes a mounting frame, the mounting frame is fixedly connected to the middle position inside the liquid storage tank, an annular storage groove is arranged on the outer edge of the mounting frame, and a plurality of inclined first filters are fixedly connected to the mounting frame.

[0008] Preferably, a scraper is slidably arranged on the top of the first filter, a connecting ring is fixedly connected to the top of the scraper, and the connecting ring is fixedly connected to the side of the rotating shaft.

[0009] Preferably, a second filter is fixedly connected to the storage groove position of the mounting frame.

[0010] Preferably, a collection box is fixedly connected to the side of the liquid storage tank, a discharge port is arranged on the side of the liquid storage tank, and the discharge port is used to communicate the storage groove with the collection box.

[0011] Preferably, the dispersion cover is a concave arc shape, and a plurality of through holes are arranged on the dispersion cover in an annular and evenly distributed manner.

[0012] Preferably, a support frame is rotatably connected to the top position of the rotating shaft, and the support frame is fixedly connected to the inner side of the liquid storage tank.

[0013] The beneficial effects are as follows: The power mechanism and the separation mechanism are provided. The rotation of the blade can perform wind pressure on the exhaust gas below the dispersion cover, which is beneficial to the dispersion of the exhaust gas on the bottom surface of the dispersion cover and evenly pass through each through hole, improving the exhaust gas washing effect. And the succinic anhydride in the cooled exhaust gas will solidify. The setting of the first filter prevents the succinic anhydride from continuing to participate in the circulation of the washing liquid. The solid succinic anhydride is collected into the collection box through the action of the scraper, reducing waste.

[0014] The additional technical features and their advantages of the present utility model will be more clearly described in the following description content, or can be understood through the specific practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the tail gas washing device of a succinic anhydride rectification system described in the present utility model;

[0017] Figure 2 It is a cross-sectional view of the tail gas washing device of a succinic anhydride rectification system described in the present utility model;

[0018] Figure 3 It is a schematic diagram of the power mechanism and separation mechanism structure of the tail gas washing device of a succinic anhydride rectification system described in the present utility model;

[0019] Figure 4 It is a schematic diagram of the separation mechanism of the tail gas washing device of a succinic anhydride rectification system described in the present utility model;

[0020] Figure 5 It is a schematic diagram of the cut-away view of the installation frame of the tail gas washing device of a succinic anhydride rectification system described in the present utility model;

[0021] Figure 6 It is a schematic diagram of the structure of the dispersion cover of the tail gas washing device of a succinic anhydride rectification system described in the present utility model;

[0022] Figure 7 It is the Figure 2 enlarged view at position A of the tail gas washing device of a succinic anhydride rectification system described in the present utility model.

[0023] Explanation of the reference numerals in the accompanying drawings is as follows: 101, liquid storage tank; 102, support; 103, base; 104, cooling pipe; 105, intake pipe; 106, discharge port; 201, washing tower; 202, flange assembly; 203, dispersion cover; 204, through hole; 205, packing layer; 206, atomizing nozzle; 207, demister; 208, exhaust pipe; 301, circulation pipe; 302, circulation pump; 303, washing nozzle; 304, liquid inlet pipe; 401, motor; 402, rotating shaft; 403, support frame; 404, blade; 501, installation frame; 502, receiving groove; 503, first filter screen; 504, second filter screen; 505, connecting ring; 506, scraper; 507, collection box. Specific Embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0026] The present utility model will be further described below with reference to the drawings:

[0027] As Figure 1 — Figure 7 shown, a tail gas washing device for a succinic anhydride rectification system includes a liquid storage tank 101. A bracket 102 is bolted to the liquid storage tank 101. A base 103 is bolted to the bottom of the bracket 102. A washing mechanism is arranged at the top of the liquid storage tank 101. A cooling pipe 104 is bolted inside the liquid storage tank 101. The top of the cooling pipe 104 communicates with a coolant supply source. An air inlet pipe 105 is bolted to the liquid storage tank 101. Both the cooling pipe 104 and the air inlet pipe 105 are arranged in a spiral shape and both pass through the inner sandwich of the liquid storage tank 101 from top to bottom. The washing mechanism includes a multi-stage washing tower 201. A flange assembly 202 is arranged between each section of the washing tower 201. The flange assembly 202 detachably connects each section of the washing tower 201. A number of packing layers 205 are fixedly arranged inside the washing tower 201. An atomizing nozzle 206 is bolted inside the washing tower 201. The atomizing nozzle 206 communicates with the outside through a pipeline. A demister 207 is arranged above the atomizing nozzle 206. The demister 207 is used for final demisting of the tail gas. An exhaust pipe 208 is fixedly arranged at the top of the washing tower 201. A dispersion cover 203 is bolted to the inner wall of the bottom of the washing tower 201. A circulation mechanism is installed on the liquid storage tank 101 and the washing tower 201. The circulation mechanism includes a circulation pipe 301. A circulation pump 302 is fixedly installed on the circulation pipe 301. The circulation pipe 301 communicates from the bottom of the washing tower 201 to the middle position of the washing tower 201. A washing nozzle 303 is fixedly installed at the water outlet end of the circulation pipe 301. A liquid inlet pipe 304 is bolted to the side wall of the circulation pipe 301. A power mechanism is arranged inside the liquid storage tank 101. The power mechanism includes a motor 401. The motor 401 is bolted to the base 103. The output end of the motor 401 is connected to a rotating shaft 402 through a coupling. A support frame 403 is rotatably connected to the top position of the rotating shaft 402. The support frame 403 is bolted to the inside of the liquid storage tank 101. A blade 404 is bolted to the top end of the rotating shaft 402. A separation mechanism is arranged inside the liquid storage tank 101. The separation mechanism is used to separate residual succinic anhydride in the washing liquid;

[0028] The separation mechanism includes an installation frame 501, which is connected to the middle position inside the liquid storage tank 101 by bolts. An annular storage groove 502 is provided on the outer edge of the installation frame 501. A number of inclined first filter meshes 503 are connected to the installation frame 501 by bolts. The setting of the first filter meshes 503 allows the washing liquid to pass through, without affecting the circulating washing effect of the washing liquid. On the other hand, it is beneficial for solid substances to move from the first filter meshes 503 to the position of the storage groove 502.

[0029] In this embodiment, a scraper 506 is slidably arranged on the top of the first filter mesh 503. When the scraper 506 rotates, it can scrape off the solid succinic anhydride left on the first filter mesh 503 and move to the outer peripheral position of the installation frame 501 due to centrifugal force, which is beneficial for gathering into the storage groove 502 for easy collection. A connecting ring 505 is connected to the top of the scraper 506 by bolts, and the connecting ring 505 is connected to the side of the rotating shaft 402 by bolts.

[0030] In this embodiment, a second filter mesh 504 is connected to the position of the storage groove 502 of the installation frame 501 by bolts. The setting of the second filter mesh 504 is beneficial for further separating the solid succinic anhydride from the washing liquid. The liquid falls along the second filter mesh 504, and the solid substances will remain in the storage groove 502.

[0031] In this embodiment, a collection box 507 is connected to the side of the liquid storage tank 101 by bolts. A detachable sealing cover is provided on the collection box 507. A discharge port 106 is provided on the side of the liquid storage tank 101. The discharge port 106 is used to connect the storage groove 502 and the collection box 507. As the second filter mesh 504 rotates, whenever the gathered solid succinic anhydride moves to the position of the discharge port 106, it will enter the discharge port 106 due to centrifugal force. The solid succinic anhydride enters the collection box 507 through the discharge port 106, which is convenient for subsequent collection work.

[0032] In this embodiment, the dispersion cover 203 is in a concave arc shape. With this setting, when the tail gas is brought to the position of the dispersion cover 203 by the action of the blades 404, the tail gas is guided by the arc and dispersed, which is beneficial for uniform spreading. A number of through holes 204 are annularly and evenly arranged on the dispersion cover 203. The through holes 204 are arranged in a tapered shape with the upper part larger and the lower part smaller. When the dispersed tail gas passes through each through hole 204, it contacts the washing liquid, which can improve the washing effect.

[0033] Working principle: When the device is in use, the washing liquid is added into the liquid storage tank 101 through the liquid inlet pipe 304, and the coolant is introduced from the top of the cooling pipe 104 and discharged from the bottom of the cooling pipe 104 to the heat recovery device (not shown in the figure). Then, the circulation pump 302 and the motor 401 are started. The rotation speed of the motor 401 is moderate to avoid excessive noise. The tail gas of the rectification system is introduced from the bottom into the air inlet pipe 105. The tail gas passes through the air inlet pipe 105 and, after being cooled by the cooling pipe 104, is discharged at the junction of the washing tower 201 and the liquid storage tank 101. The motor 401 drives the rotating shaft 402 to rotate, and the rotating shaft 402 drives the blades 404 to rotate, so that the just-discharged tail gas obtains a greater upward force and is evenly dispersed in the washing tower 201 through the action of the dispersion cover 203. When the circulation pump 302 is started, the washing liquid in the washing tower 201 is pumped from the bottom of the circulation pipe 301 to the top and sprayed downward from the washing nozzle 303 to contact the tail gas rising from the bottom, and the washing operation is carried out at the position of the packing layer 205. After the tail gas is washed, it is finally discharged from the exhaust pipe 208 after being treated by the atomizing nozzle 206 and the demister 207 and enters the next step. The detergent with the substances in the tail gas falls onto the first filter screen 503. The rotating shaft 402 drives the scraper 506 to rotate through the connecting ring 505, scrapes the solidified succinic anhydride after cooling, and throws the solid succinic anhydride into the storage tank 502 and finally into the collection box 507 through the discharge port 106, and the tail gas washing operation of the succinic anhydride rectification system is carried out in this way.

[0034] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed.

Claims

1. A tail gas scrubbing device for a succinic anhydride distillation system, comprising a liquid storage tank (101), a bracket (102) fixedly connected to the liquid storage tank (101), a base (103) fixedly connected to the bottom of the bracket (102), a scrubbing mechanism disposed on the top of the liquid storage tank (101), a cooling pipe (104) fixedly connected inside the liquid storage tank (101), and an air intake pipe (105) fixedly connected to the liquid storage tank (101), characterized in that: The washing mechanism comprises a multi-stage washing tower (201), the inner wall of the bottom of the washing tower (201) is fixedly connected to a dispersion cover (203), a circulation mechanism is installed on the liquid storage tank (101) and the washing tower (201), the circulation mechanism comprises a circulation pipe (301), the circulation pipe (301) is connected from the bottom of the washing tower (201) to the middle of the washing tower (201), a washing nozzle (303) is fixedly installed at the water outlet end of the circulation pipe (301), a power mechanism is arranged in the liquid storage tank (101), the power mechanism comprises a motor (401), the motor (401) is fixedly connected to the base (103), the output end of the motor (401) is fixedly connected to a rotating shaft (402), and the top end of the rotating shaft (402) is fixedly connected to a blade (404), and a separation mechanism is arranged in the liquid storage tank (101), the separation mechanism is used to separate residual succinic anhydride in the washing liquid; The separation mechanism comprises a mounting frame (501), the mounting frame (501) being fixedly connected to a middle position inside the liquid storage tank (101), an annular storage groove (502) being provided at the outer edge of the mounting frame (501), and a plurality of first filter screens (503) being fixedly connected to the mounting frame (501) and being arranged obliquely.

2. The tail gas scrubbing device of a succinic anhydride distillation system according to claim 1, characterized in that: A scraper (506) is slidably provided on the top of the first filter screen (503), a connecting ring (505) is fixedly connected to the top of the scraper (506), and the connecting ring (505) is fixedly connected to the side of the rotating shaft (402).

3. The tail gas scrubbing device of a succinic anhydride distillation system according to claim 1, characterized in that: The storage groove (502) of the installation frame (501) is fixedly connected to a second filter screen (504).

4. The tail gas scrubbing device of a succinic anhydride distillation system according to claim 1, characterized in that: A collecting box (507) is fixedly connected to the side of the liquid storage tank (101), and a discharge port (106) is provided on the side of the liquid storage tank (101), wherein the discharge port (106) is used to connect the storage tank (502) and the collecting box (507).

5. The tail gas scrubbing device of a succinic anhydride distillation system according to claim 1, characterized in that: The dispersion cover (203) is in a concave arc shape, and is provided with a plurality of through holes (204) evenly distributed in an annular shape.

6. The tail gas scrubbing device of a succinic anhydride distillation system according to claim 1, characterized in that: A support frame (403) is rotatably connected to the top of the rotating shaft (402), and the support frame (403) is fixedly connected to the inner side of the liquid storage tank (101).

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