Novel acetylene cleaning system

Abstract

The utility model discloses a novel acetylene cleaning system and belongs to the technical field of acetylene preparation in polyvinyl chloride production. The device comprises a tower body, the bottom of the side part of the tower body is communicated with an acetylene inlet pipe, the top of the tower body is communicated with an acetylene outlet, the top of the side part of the tower body is communicated with a 98% acid inlet of a tower plate, a filler layer is fixedly connected inside the tower body, and the bottom of the side part of the tower body is communicated with a circulating acid structure. A baffling structure is fixedly connected in the tower body, the top of the side part of the tower body is communicated with an intermediate acid circulating structure, the top of the side part of the tower body is communicated with a tower plate acid inlet, the baffling structure comprises a partition plate fixedly connected in the tower body, and a first strip-shaped bubble cap layer located at the bottom of the partition plate is fixedly connected in the tower body. In order to reduce the carbonization phenomenon, a baffling structure is designed into a strip-shaped channel and a liquid channel is designed into a baffling form by utilizing a cleaning system through process calculation and equipment form optimization, so that the concentration of a liquid phase part is uniformly reduced in a gradient manner, and a plurality of paths of intermediate acid return pipes are additionally arranged.

Description

Technical Field

[0001] The utility model belongs to the technical field of preparing acetylene in polyvinyl chloride production, in particular to a novel acetylene purification system. Background Art

[0002] In the production of polyvinyl chloride, acetylene and hydrogen chloride are the main raw materials. Under the general environment of energy conservation and emission reduction in all walks of life across the country, the production of acetylene by the calcium carbide method has become a trend. The acetylene gas produced by the calcium carbide method contains impurities such as hydrogen sulfide and phosphine, which will cause side reactions in the subsequent synthesis reaction and affect the product quality. Therefore, in the production of acetylene, the main task is to purify acetylene. Traditional purification methods include sodium hypochlorite and concentrated sulfuric acid. The concentrated sulfuric acid purification process is adopted by more companies because of its advantages such as water saving and safety.

[0003] Concentrated sulfuric acid is highly oxidizing. When the concentration is too low, sulfur and phosphorus impurities cannot be completely removed. When the concentration is too high, the temperature is too high, or it comes into contact with concentrated sulfuric acid for a long time, carbonization will occur during the purification process. As time accumulates, carbides will clog the circulation pool, causing uneven gas-liquid distribution and deterioration of circulation, resulting in serious consequences.

[0004] Therefore, it is necessary to redesign the new acetylene purification system. Utility Model Content

[0005] In order to solve the problems raised in the above-mentioned background technology, the purpose of the utility model is to provide a new acetylene purification system, which has the advantage of reducing carbonization pollution, and solves the problem that concentrated sulfuric acid has strong oxidizing properties, sulfur and phosphorus impurities are not completely removed when the concentration is too low, and carbonization occurs during the purification process when the concentration is too high, the temperature is too high or it is in contact with concentrated sulfuric acid for a long time. As time accumulates, carbides will block the circulation pool, the gas-liquid distribution is uneven, the circulation deteriorates, and serious consequences are caused.

[0006] The utility model provides the following technical solutions: a novel acetylene purification system, comprising a tower body;

[0007] The bottom of the tower body side is connected with an acetylene inlet pipe, the top of the tower body is connected with an acetylene outlet, the top of the tower body side is connected with a 98% acid inlet of the tower plate, the inside of the tower body is fixedly connected with a packing layer, the bottom of the tower body side is connected with a circulating acid structure, the inside of the tower body is fixedly connected with a baffle structure, the top of the tower body side is connected with an intermediate acid circulation structure, and the tops of the tower body sides are all connected with the acid inlets of the tower plates.

[0008] The intermediate acid circulation structure includes a gas phase balance port and a tower plate acid outlet respectively connected to the bottom of the tower body side, the gas phase balance port and the tower plate acid outlet are both located at the top of the dividing plate, the gas phase balance port and the tower plate acid outlet are both connected to an intermediate acid tank on the side away from the tower body, the output end of the intermediate acid tank is connected to an intermediate acid pump, the output end of the intermediate acid pump is connected to an intermediate acid heat exchanger, the side of the tower plate acid inlet away from the shell is connected to the output end of the intermediate acid heat exchanger, the tower body side tower plate acid inlets are respectively located on the inner sides of multiple second strip bubble layers, and the bottom end of the tower body side tower plate acid inlet is connected between the dividing plate and the first strip bubble layer.

[0009] The beneficial effects of the utility model are as follows: In order to reduce the carbonization phenomenon, the utility model uses the purification system through process calculation and equipment form optimization, designs the baffle structure into a strip channel, and designs the liquid channel into a baffle form, so that the concentration of the liquid phase part is uniformly reduced in a gradient, and adds multiple intermediate acid return pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model.

[0011] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model.

[0012] Figure 3 It is a schematic cross-sectional view of the main structure of the utility model. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0014] like Figures 1 to 3 As shown, the novel acetylene purification system of this embodiment includes a tower body 1; the bottom of the side of the tower body 1 is connected to an acetylene inlet pipe 2, the top of the tower body 1 is connected to an acetylene outlet 3, the top of the side of the tower body 1 is connected to a 98% acid inlet 4 of the tower plate, the inside of the tower body 1 is fixedly connected to a packing layer 5, the bottom of the side of the tower body 1 is connected to a circulating acid structure 6, the inside of the tower body 1 is fixedly connected to a baffle structure 7, the top of the side of the tower body 1 is connected to an intermediate acid circulation structure 8, and the top of the side of the tower body 1 is connected to a tower plate acid inlet 9.

[0015] refer to Figure 3 The baffle structure 7 includes a dividing plate 10 fixedly connected to the inside of the tower body 1, a first strip bubble layer 11 located at the bottom of the dividing plate 10 is fixedly connected to the inside of the tower body 1, a second strip bubble layer 12 located at the top of the dividing plate 10 is fixedly connected to the inside of the tower body 1, and the bottoms of the first strip bubble layer 11 and the second strip bubble layer 12 are staggered and connected with a downcomer 13.

[0016] refer to Figure 3 The circulating acid structure 6 includes a bottom liquid outlet 14 connected to the bottom of the side of the tower body 1, and the bottom liquid outlet 14 is connected to a dilute acid circulation pump 15 on the side away from the tower body 1. The output end of the dilute acid circulation pump 15 is respectively connected to a dilute acid heat exchanger 16 and a dilute acid external discharge pipeline 17, and the output end of the dilute acid heat exchanger 16 is connected to a circulating acid inlet 18. The end of the circulating acid inlet 18 away from the dilute acid heat exchanger 16 passes through the tower body 1 and extends to the interior of the tower body 1. The end of the dilute acid heat exchanger 16 located inside the tower body 1 is connected to a dilute acid distributor 19, and the dilute acid distributor 19 is located between the packing layer 5 and the first strip bubble layer 11.

[0017] refer to Figure 3 The intermediate acid circulation structure 8 includes a gas phase balance port 20 and a tower plate acid outlet 21 respectively connected to the bottom of the side of the tower body 1, the gas phase balance port 20 and the tower plate acid outlet 21 are both located at the top of the dividing plate 10, and the gas phase balance port 20 and the tower plate acid outlet 21 are connected to the intermediate acid tank 22 on the side away from the tower body 1, the output end of the intermediate acid tank 22 is connected to the intermediate acid pump 23, and the output end of the intermediate acid pump 23 is connected to the intermediate acid heat exchanger 24, and the side of the tower plate acid inlet 9 away from the shell is connected to the output end of the intermediate acid heat exchanger 24, the tower plate acid inlet 9 on the side of the tower body 1 is respectively located on the inner side of the plurality of second strip bubble layers 12, and the bottom end of the tower plate acid inlet 9 on the side of the tower body 1 is connected between the dividing plate 10 and the first strip bubble layer 11.

[0018] The circulating acid of the utility model is forced to circulate from the tower bottom liquid outlet 14 through the dilute acid circulation pump 15, from the circulating acid inlet 18, after being distributed by the dilute acid distributor 19, it is sprayed from the upper part of the packing layer 5, and a dilute acid heat exchanger 16 is provided in the dilute acid forced circulation loop. The excess dilute acid is sent out through the dilute acid external discharge pipeline 17. 98% concentrated sulfuric acid enters the system through the 98% acid inlet 4 of the tower plate, and after being deflected by the second strip bubble layer 12, it is dropped from the downcomer 13 to the next second strip bubble layer 12, reversely deflected, and finally flows from the tower plate acid outlet 21 into the intermediate acid tank 2 2, through forced circulation by the intermediate acid pump 23, the acid enters the tower body 1 from any one of the tray acid inlets 9 on the side of the tower body 1, an intermediate acid heat exchanger 24 is provided in the intermediate acid forced circulation loop, the excess intermediate acid enters the second strip bubble layer 12 from the tray acid inlet 9 through the pipeline, and finally overflows to the packing layer 5 through the side tray acid inlet 9, the side tray acid inlet 9 of the tower body 1 can enter different second strip bubble layers 12 respectively, reduce the acid concentration of the second strip bubble layer 12, and select the most suitable tray acid inlet 9 according to different loads to prevent carbonization.

Claims

1. A novel acetylene purification system, comprising a tower body (1); Features: The bottom of the side of the tower body (1) is connected to an acetylene inlet pipe (2), the top of the tower body (1) is connected to an acetylene outlet (3), the top of the side of the tower body (1) is connected to a 98% acid inlet (4) of a tower plate, a packing layer (5) is fixedly connected inside the tower body (1), the bottom of the side of the tower body (1) is connected to a circulating acid structure (6), the inside of the tower body (1) is fixedly connected to a baffle structure (7), the top of the side of the tower body (1) is connected to an intermediate acid circulation structure (8), and the top of the side of the tower body (1) is connected to a tower plate acid inlet (9).

2. The novel acetylene purification system according to claim 1 is characterized in that: The baffle structure (7) comprises a partition plate (10) fixedly connected to the inside of a tower body (1); a first strip-shaped bubble layer (11) located at the bottom of the partition plate (10) is fixedly connected to the inside of the tower body (1); a second strip-shaped bubble layer (12) located at the top of the partition plate (10) is fixedly connected to the inside of the tower body (1); the bottoms of the first strip-shaped bubble layer (11) and the second strip-shaped bubble layer (12) are both staggeredly connected to downcomers (13).

3. The novel acetylene purification system according to claim 2 is characterized in that: The circulating acid structure (6) comprises a tower bottom liquid outlet (14) connected to the bottom of the side of the tower body (1); the tower bottom liquid outlet (14) is connected to a dilute acid circulation pump (15) at a side away from the tower body (1); the output end of the dilute acid circulation pump (15) is respectively connected to a dilute acid heat exchanger (16) and a dilute acid external discharge pipeline (17); the output end of the dilute acid heat exchanger (16) is connected to a circulating acid inlet (18); the end of the circulating acid inlet (18) away from the dilute acid heat exchanger (16) passes through the tower body (1) and extends to the interior of the tower body (1); the end of the dilute acid heat exchanger (16) located inside the tower body (1) is connected to a dilute acid distributor (19); the dilute acid distributor (19) is located between the packing layer (5) and the first strip-shaped bubble cap layer (11).

4. The novel acetylene purification system according to claim 3 is characterized in that: The intermediate acid circulation structure (8) comprises a gas phase balance port (20) and a tray acid outlet port (21) respectively connected to the bottom of the side of the tower body (1), the gas phase balance port (20) and the tray acid outlet port (21) are both located at the top of the dividing plate (10), and the gas phase balance port (20) and the tray acid outlet port (21) are both connected to an intermediate acid tank (22) on the side away from the tower body (1), and the output end of the intermediate acid tank (22) is connected to an intermediate acid pump (2 3), the output end of the intermediate acid pump (23) is connected to the intermediate acid heat exchanger (24), the side of the tower plate acid inlet (9) away from the shell is connected to the output end of the intermediate acid heat exchanger (24), the side tower plate acid inlet (9) of the tower body (1) is respectively located on the inner side of the plurality of second strip-shaped bubble layers (12), and the bottom end of the side tower plate acid inlet (9) of the tower body (1) is connected between the dividing plate (10) and the first strip-shaped bubble layer (11).

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