CN113444553A - Device and method for removing volatile organic compounds in system for preparing acetylene from natural gas - Google Patents
Device and method for removing volatile organic compounds in system for preparing acetylene from natural gas Download PDFInfo
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- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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Abstract
The invention provides a device and a method for removing volatile organic compounds in a system for preparing acetylene from natural gas, wherein the device comprises an oxygen preheating furnace, a natural gas preheating furnace and a cooling tower, wherein the cooling tower and a dust remover are respectively connected with a closed separating tank, a cleaning water outlet of the closed separating tank is communicated with a stripping tower, and cleaning water formed after carbon black water is separated from carbon black in the closed separating tank is sent to the stripping tower for degassing; the method comprises the following steps: conveying carbon black water discharged from the acetylene furnace, the cooling tower and the electric dust collector to a closed separation tank for separating carbon black from water, and conveying one part of obtained clean water to the stripping tower and the other part of the obtained clean water to the acetylene furnace. The device can automatically realize carbon black separation in a closed environment, remove acetylene and other volatile organic compounds, avoid environment pollution caused by toxic and harmful gases, avoid carbon black dust emission, reduce emission of the volatile organic compounds, and achieve the removal rate of 99.5-99.9% for acetylene and 90.2-99.0% for carbon black water.
Description
Technical Field
The invention belongs to the technology of preparing acetylene by natural gas cracking, and particularly relates to a device and a method for removing volatile organic compounds in a system for preparing acetylene from natural gas.
Background
Acetylene is an important organic chemical raw material, and is widely used in the fields of metal processing, welding, cutting and the like, and the preparation of chemical products such as ethylene, chloroethylene, trichloroethylene, vinyl acetate, acrylonitrile, polyacrylonitrile, 1, 4-butanediol and the like. The preparation method of acetylene mainly comprises a non-catalytic partial oxidation method, an electric arc method and a plasma method, wherein the electric arc method is eliminated due to high energy consumption, the plasma method is still in a test stage (the current state of research of natural gas acetylene, thinking, angry, vinylon communication, No. 33, No. 2, pages 15-20, published 2013, No. 12 and 31), the power consumption is high, the requirements on equipment are harsh, the method is difficult to popularize and apply so far, and the non-catalytic partial oxidation method is a main method for producing acetylene at the present stage.
At present, the main structure and production process of a production device adopted in the process of preparing acetylene by natural gas non-catalytic partial oxidation are as follows: the natural gas pipeline and the oxygen pipeline are respectively connected with a gas heater, natural gas and oxygen are respectively preheated to 600-650 ℃, the natural gas is firstly introduced into the acetylene reaction furnace, when the temperature of the natural gas reaches a set value, an auxiliary oxygen regulating valve of the reaction furnace is opened, and an ignition gun is operated to ignite; introducing oxygen for oxygen feeding after ignition is successful, wherein reaction gas consisting of natural gas and oxygen generates partial oxidation reaction in a reaction chamber of an acetylene furnace, cooling after reaction for a few milliseconds to finish the reaction, and hydrocarbon is partially oxidized and cracked into a cracked gas mixture containing acetylene, carbon monoxide, carbon dioxide, hydrogen, carbon black and other components; and (3) after the cracked gas mixture from the acetylene reaction furnace passes through the lower section of the cooling tower, the electric dust remover and the upper section of the cooling tower, further cooling and washing carbon black in the cracked gas mixture, and then entering a concentration system through a compressor to obtain acetylene and synthesis gas products. The method comprises the steps of enabling water containing carbon black discharged from the bottoms of an acetylene furnace, a cooling tower and an electric dust collector to enter a collecting pipe, enabling a small amount of gas to be removed through flash evaporation through a first-stage sieve plate degassing tank, enabling the water to enter an open carbon black water tank, separating carbon black from water, enabling the obtained clean water to partially return to the acetylene furnace to be used as quenching water, enabling one part of the clean water to be sent to a cooling tower to be cooled, and then sending the cooled clean water to the cooling tower, the electric dust collector and a concentration device to be used as spray cooling water, wherein the system is generally called as a carbon black water system. In the carbon black water system, the carbon black water in the carbon black groove can volatilize a large amount of organic gas (namely volatile organic compounds such as acetylene, diacetylene, benzene and many benzene rings) and dust, the environment is polluted, the structure is relatively complicated to scrape out the carbon black in the current carbon black groove, under the high humidity environment, the chain is easy to crack, the maintenance is frequent, and the stable operation of the device is not facilitated.
In addition, document US9290384B2 discloses a structure combining a sealed carbon black tank and a vacuum flash tank to solve the problem of carbon black water gas drift into a water cooling tower, and a heat exchanger is used to replace the water cooling tower. However, the system is only suitable for a closed production process with high oxygen ratio (oxygen ratio is more than or equal to 0.62: 1, and the oxygen ratio refers to the volume ratio of oxygen to natural gas).
Disclosure of Invention
The invention aims to provide a device for removing volatile organic compounds in a system for preparing acetylene from natural gas, which is suitable for any oxygen ratio production process.
In order to achieve the above object, the present invention adopts the following technical solutions.
The device of desorption natural gas system volatility organic matter is including oxygen preheater, natural gas preheater, the cooling tower that links to each other with the acetylene furnace respectively, and the dust remover is connected to the cooling tower, its characterized in that: the acetylene furnace, the cooling tower and the dust remover are respectively connected with a closed separating tank, a cleaning water outlet of the closed separating tank is communicated with the gas stripping tower, and cleaning water formed after carbon black water is separated from carbon black in the closed separating tank is sent into the gas stripping tower for degassing. For improving the desorption effect of natural gas system acetylene volatile organic compounds, the closed knockout drum includes the top confined jar body, it separates into liquid inlet zone and carbon black collecting region with jar internal chamber to be provided with the baffle axially in jar, be provided with the flexible scraper blade that is pressure contact with the baffle top at jar body top, flexible scraper blade direction of motion is opposite with carbon black water flow direction, scrape into carbon black collecting region through the rotation of flexible scraper blade with floating carbon black, the carbon black of carbon black water forms the cleaning water after being separated and gets into in the stripping tower from the cleaning water liquid outlet.
In order to further improve the removal effect of volatile organic compounds in the system for preparing acetylene from natural gas, the inner cavity of the tank body is divided into a liquid inlet area, a baffling area and/or a liquid blowing area and/or a clarified liquid area and a carbon black collecting area by a partition plate.
In order to further improve the removal effect of volatile organic compounds in the system for preparing acetylene from natural gas, the inner cavity of the tank body is composed of a liquid inlet area, a first deflection area, a first liquid blowing area, a second deflection area, a second liquid blowing area, a clarified liquid area and a carbon black collecting area which are sequentially arranged.
Further, carbon black water in the liquid inlet area enters the first deflection area from the top end of the partition plate, carbon black water in the first deflection area enters the first drum liquid area from the bottom of the partition plate, carbon black water in the first drum liquid area enters the second deflection area from the top end of the partition plate, carbon black water in the second deflection area enters the second drum liquid area from the bottom of the partition plate, carbon black water in the second drum liquid area enters the clarified liquid area from the top end of the partition plate, and clean water (namely water after carbon black separation, also called clean water) in the clarified liquid area flows out from the liquid outlet.
In order to clean floating carbon black conveniently, a first inclined plate is arranged on the top of a first partition plate between a liquid inlet area and a carbon black collecting area, a second inclined plate is arranged on the top of a seventh partition plate between the carbon black collecting area and a clear liquid area, and the first inclined plate and the second inclined plate are inclined along the opposite direction of the movement direction of the flexible scraper plate.
Preferably, the gradient of the inclined plate I is 15-30 degrees, and the radial eccentric angle of the inclined plate I is 5-10 degrees; the flexible scraper adopts a fiber clamping rubber scraper, and the included angle between the flexible scraper and the inclined plate I (the included angle of the same radial section) is 10-45 degrees.
Furthermore, the flexible scraper is connected to the top wall in the tank body through a scraper mounting seat, and the scraper mounting seat is connected with the output end of the motor and is driven by the motor.
In order to realize the reutilization of volatile organic compounds in a system for preparing acetylene from natural gas, a gas stripping gas outlet of a gas stripping tower is communicated with a gas-liquid separation tank, the gas-liquid separation tank is connected with a cracked gas system, and a liquid outlet of the gas stripping tower is communicated with a hyperbolic cooling tower.
In order to reduce the production cost of acetylene production, the closed separation tank is also communicated with the acetylene furnace, and part of clean water obtained after carbon black separation is directly led to the acetylene furnace for quenching.
In order to further reduce the production cost of acetylene, the hyperbolic cooling tower is connected with the acetylene furnace and/or the cooling tower and/or the dust remover, and cold water from the hyperbolic cooling tower is used as quenching water in the acetylene furnace and/or cooling water in the cooling tower and/or washing water in the dust remover.
Preferably, the stripping column is a vacuum stripping column.
Preferably, the packing in the stripping tower adopts random packing or regular packing, such as saddle ring packing, Raschig ring packing, ladder ring packing and grid packing, and the absolute pressure level of the stripping tower is 40-60 KPa.
Preferably, the stripping tower is connected with an acetylene tail gas pipe, and the acetylene tail gas is used as stripping gas.
Preferably, a spray section is provided in the stripper, and clean water from the closed separation tank is sprayed by the spray section.
The second purpose of the invention is to provide a method for removing volatile organic compounds in a system for preparing acetylene from natural gas, which adopts the device for removing volatile organic compounds in the system for preparing acetylene from natural gas.
The method for removing volatile organic compounds in the system for preparing acetylene from natural gas comprises the following steps:
In order to further improve the removal effect of volatile organic compounds in the system for preparing acetylene from natural gas, the retention time of carbon black water in the closed separation tank is controlled to be 9-11 minutes.
In order to improve the degassing rate of the carbon black water, the volume ratio of the stripping gas entering the stripping tower to the clean water in a standard state is 0.8:1-2: 1.
Has the advantages that: the device can automatically realize carbon black separation in a closed environment, realize removal of volatile organic compounds such as acetylene and the like, is suitable for any oxygen ratio production process, avoids environment pollution caused by toxic and harmful gases, avoids carbon black dust emission, reduces emission of volatile organic compounds, can recover acetylene in carbon black water, reduces acetylene gas loss caused by carbon black water dissolution and entrainment, improves acetylene production yield, has the advantages of simple structure and convenient inspection and maintenance, can recycle water resources and saves production cost, and the removal rate of acetylene can reach 99.5-99.9 percent and the degassing rate of carbon black water can reach 90.2-99.0 percent; more importantly, the device of the invention runs very stably and smoothly, and the condition of sudden interruption of the running rarely occurs.
Drawings
FIG. 1 is a flow chart of an apparatus for removing volatile organic compounds in a system for preparing acetylene from natural gas in an embodiment;
FIG. 2 is a schematic cross-sectional view of the closed type separation tank in example 1 (FIG. 2 is a view taken along line B-B of FIG. 3);
FIG. 3 is a schematic side view of the closed separator tank in example 1 (FIG. 3 is a view taken along line C-C in FIG. 4);
FIG. 4 is a schematic top view of the internal separation vessel in example 1;
FIG. 5 is a schematic cross-sectional view of a closed separation tank of an apparatus for removing volatile organic compounds from a system for producing acetylene from natural gas in example 7.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the following embodiments are only used for understanding the principle of the present invention and the core idea thereof, and do not limit the scope of the present invention. It should be noted that modifications to the invention as described herein, which do not depart from the principles of the invention, are intended to be within the scope of the claims which follow.
Example 1
This example mainly describes an apparatus for removing volatile organic compounds in a system for producing acetylene from natural gas.
Referring to fig. 1 to 4, the device for removing volatile organic compounds in a system for preparing acetylene from natural gas comprises an oxygen preheating furnace 101, a natural gas preheating furnace 102 and a cooling tower 104 which are respectively connected with an acetylene furnace 103, wherein the cooling tower 104 is connected with a dust remover 106, the acetylene furnace 103, the cooling tower 104 and the dust remover 106 are respectively connected with a closed separation tank 107, the closed separation tank 107 comprises a tank body 30 with a closed top, the bottom of the tank body 30 is provided with a supporting leg 9, the side wall of the tank body 30 is provided with a liquid outlet N1 and a liquid outlet pipe 11, and the side wall of the bottom of the tank body 30 is provided with a liquid low discharge port N4, a liquid outlet N5, a precipitate outlet N2 and a liquid inlet N3; a partition board is axially arranged in a tank body 30 to divide an inner cavity of the tank body 30 into a liquid inlet area 29 and a carbon black collecting area 28, a flexible scraper 15 in pressure contact with the top end of the partition board is arranged at the top of the tank body 30, the moving direction of the flexible scraper 15 is opposite to the flow direction of carbon black water, floating carbon black is scraped into the carbon black collecting area 28 through the rotation of the flexible scraper 15, and the carbon black of the carbon black water is separated to form clean water which is discharged from a liquid outlet N1.
In this embodiment, the inner cavity of the tank 30 is composed of a liquid inlet region 29, a first deflection region 21, a first liquid blowing region 22, a second deflection region 23, a second liquid blowing region 25, a clarified liquid region 26 and a carbon black collecting region 28 which are arranged in sequence. In the use process, the carbon black water entering the liquid inlet area 29 enters the first deflection area 21 from the top end of the second partition plate 2, the carbon black water in the first deflection area 21 enters the first liquid blowing area 22 from the bottom of the third partition plate 3, the carbon black water in the first liquid blowing area 22 enters the second deflection area 23 from the top end of the fourth partition plate 4, the carbon black water in the second deflection area 23 enters the second liquid blowing area 25 from the bottom of the fifth partition plate 5, the carbon black water in the second liquid blowing area 25 enters the clarified liquid area 26 from the top end of the sixth partition plate 6, and the clean water in the clarified liquid area 26 is discharged from the liquid outlet N1.
In this embodiment, a first inclined plate 8 is disposed on the top of the first partition plate 1 between the liquid inlet region 29 and the carbon black collecting region 28, a second inclined plate 27 is disposed on the top of the first partition plate between the carbon black collecting region 28 and the clear liquid region 26, and the first inclined plate 8 and the second inclined plate 27 are inclined in the opposite direction of the movement direction of the flexible scraper 15.
Preferably, the gradient of the inclined plate I8 is 15-30 degrees, and the radial eccentric angle of the inclined plate I8 is 5-10 degrees; the flexible scraper 15 adopts a fiber clamping rubber scraper, and the included angle between the flexible scraper 15 and the inclined plate I8 is 10-45 degrees. In the embodiment, the gradient of the inclined plate I8 is 25 degrees, and the radial eccentric angle of the inclined plate I8 is 8 degrees; the flexible scraping plate 15 adopts a fiber clamping rubber scraping plate, and the included angle between the flexible scraping plate 15 and the inclined plate I8 is 30 degrees.
In this embodiment, the flexible scraper 15 is connected to the inner top wall of the tank 30 through the scraper mounting seat 14, the scraper mounting seat 14 is connected to the output end of the motor 13 and is driven by the motor 13, and a speed reducer 12 is further arranged between the motor 13 and the scraper mounting seat 14.
In this embodiment, in order to facilitate the removal of deposited solids, a subsea valve is disposed at the bottom of each partitioned area in the tank 30, so as to facilitate the timely discharge of the sediments accumulated in the tank.
In the embodiment, the upright column 16 is arranged in the middle of the tank 30, the side edges of the partition plates are respectively connected with the inner wall of the tank 30 and the upright column 16, one end of the inclined plate I8 and one end of the inclined plate II 27 are connected with the upright column 16, and the other end of the inclined plate I and the other end of the inclined plate II are connected with the inner wall of the separation tank 30.
Referring to fig. 1, a clean water outlet N1 of the closed separation tank 107 is communicated with the stripper 109, a stripping gas outlet of the stripper 109 is communicated with a gas-liquid separation tank 111, the gas-liquid separation tank 111 is connected with a cracked gas system, and a liquid outlet N1 of the stripper 109 is communicated with a hyperbolic cooling tower 112; the closed separation tank 107 is also connected to the acetylene furnace 103, and part of the clean water obtained after the carbon black separation is directly introduced into the acetylene furnace 103 for quenching. The hyperbolic cooling tower 112 connects the acetylene furnace 103 and the cooling tower 104 with the dust remover 106, and cold water from the hyperbolic cooling tower 112 is used as quenching water in the acetylene furnace 103 and cooling water in the cooling tower 104 and washing water in the dust remover 106. The device for removing volatile organic compounds in the system for preparing acetylene from natural gas further comprises a vent torch 106 and a pump, the vent torch 106 is connected with a pipeline between the cooling tower 104 and the dust remover 106, a pump 108 is arranged on the side of a cleaning water outlet N1 of the closed separation tank 107, two paths of cleaning water pumped by the pump 108 are arranged, one path of cleaning water goes to the stripper 109, the other path of cleaning water goes to the acetylene furnace 103, a pump 113 and a pump 114 are respectively arranged on a water outlet pipeline of the hyperbolic cooling water tower 112, and a pump 110 is arranged on a pipeline connecting the gas-liquid separation tank 111 and the cracking gas header pipe.
In this embodiment, the stripper column 109 is a vacuum stripper column, which is substantially a packed column, and the packing in the vacuum stripper column is random packing or structured packing, such as saddle ring packing, Raschig ring packing, cascade ring packing, and grid packing, and the absolute pressure level of the vacuum stripper column is 40-60 KPa. Meanwhile, the vacuum stripping tower is connected with an acetylene tail gas pipe 113, and acetylene tail gas is used as stripping gas. A spray part is provided in the vacuum stripper, and clean water from the closed separation tank 107 is sprayed by the spray part.
Example 2
This example mainly describes a method for removing volatile organic compounds in a system for producing acetylene from natural gas.
Referring to fig. 1 to 4, a method for removing volatile organic compounds in a system for preparing acetylene from natural gas, which employs the apparatus for removing volatile organic compounds in a system for preparing acetylene from natural gas in example 1, includes the following steps:
specifically, the method comprises the following steps: respectively sending oxygen and natural gas into an oxygen preheating furnace 101 and a natural gas preheating furnace 102 according to a certain oxygen ratio, respectively preheating to 600-650 ℃, then entering an acetylene furnace 103 for partial oxidation reaction, leading cracked gas generated by the oxidation reaction to pass through a cooling tower 104 and an electric dust remover 106 to remove carbon black therein, leading the carbon black together with water and carbon black water from the acetylene furnace 103 to enter a liquid inlet area 29 in a closed separation tank 107 through a liquid inlet N3, then overflowing into a first baffling area 21 through a second partition plate 2, leading carbon black to be scraped into a carbon black collecting area 28 by a flexible scraper 15 in the area so as to primarily separate the floating carbon black and the water on the water surface, leading the carbon black water primarily separated out to enter a fan-shaped area between a third partition plate 3 and a fourth partition plate 4 in the figure from the bottom of the third partition plate 3 along the counterclockwise direction and overflowing into a second baffling area 23; then, the carbon black water in the second baffling area 23 enters the second liquid blowing area 25 from the bottom of the partition plate five 5, the carbon black water in the second liquid blowing area 25 enters the clarified liquid area 26 from the top end of the partition plate six 6, and the clean water in the clarified liquid area 26 flows out from the liquid outlet; in the operation process, carbon black water flows anticlockwise, the flexible scraper 15 is driven by the motor 13 to rotate clockwise, and the flexible scraper 15 is in pressure contact with the top end of the partition plate, so that the flexible scraper 15 can be in close contact with the inclined plate I8 and the inclined plate II 27 while rotating, and carbon black floating on the liquid surface is scraped into the carbon black collecting area 28;
Examples 2 to 6 and comparative example 1
The method for removing the volatile organic compound in the system for preparing acetylene from natural gas adopts the device for removing the volatile organic compound in the system for preparing acetylene from natural gas in example 1, and the steps are as shown in table 1, referring to example 2, wherein the differences from example 2 are carbon black water separation time/volume ratio of acetylene tail gas to clean water and pressure of a vacuum stripping tower.
Table 1 process parameters for examples 2-6 and comparative example 1
Detecting the turbidity of the clean water, the carbon black water degassing rate and the acetylene removal rate after separating the carbon black
The turbidity of the clean water after separation of the carbon black was measured using a turbidity meter. The detection method of the carbon black water degassing rate (namely the removal rate of volatile organic compounds in the carbon black water) and the acetylene removal rate is a headspace gas chromatography, and comprises the following specific steps; taking 2g-4g of a water sample into a headspace sample injection bottle, adding an internal standard solution accounting for 25% -75% of the mass of the water sample, sealing, putting into headspace sample injection equipment Turbomatrix, keeping the temperature at 60 ℃ -90 ℃ for 30min-60min, automatically entering a gas chromatography Perkinelmer for analysis, and calculating the content of each component in the water sample according to the peak value; and the carbon black water degassing rate and the acetylene removal rate were calculated according to the formulas (total amount of gas in undegassed carbon black water-total amount of gas in degassed cleaning water)/total amount of gas in undegassed carbon black water × 100%, acetylene removal rate (total amount of acetylene in undegassed carbon black water-total amount of acetylene in degassed cleaning water)/total amount of acetylene in undegassed carbon black water × 100%, and the results are shown in table 2.
TABLE 2 test results
| Examples | Clean Water turbidity NTU after separation of carbon Black | Carbon black water degassing Rate/%) | Acetylene removal rate/%) |
| Example 1 | 18 | 94.9 | 99.8 |
| Example 2 | 20 | 95.7 | 99.6 |
| Example 3 | 15 | 97.6 | 99.8 |
| Example 4 | 21 | 97.5 | 99.7 |
| Example 5 | 20 | 90.2 | 99.5 |
| Example 6 | 15 | 99 | 99.9 |
| Comparative example 1 | 17 | 62.1 | 50％ |
As can be seen from Table 2, when the carbon black water is treated by the methods of examples 1 to 6, the carbon black water degassing rate (i.e., the removal rate of volatile organic compounds in the carbon black water) can reach 90.2 to 99%, and the acetylene removal rate can reach 99.5 to 99.9%. Therefore, the method can realize the closed separation of the carbon black water, can well remove the volatile organic compounds in the carbon black water, reduce the emission of the volatile organic compounds and simultaneously reduce the acetylene loss.
Example 7
This embodiment mainly describes another specific structure of the apparatus for removing volatile organic compounds in a system for producing acetylene from natural gas.
Referring to fig. 1, fig. 3, fig. 4 and fig. 5, the apparatus for removing volatile organic compounds in a system for preparing acetylene from natural gas comprises an oxygen preheating furnace 101, a natural gas preheating furnace 102 and a cooling tower 104 which are respectively connected with an acetylene furnace 103, the cooling tower 104 is connected with a dust remover 106, the acetylene furnace 103, the cooling tower 104 and the dust remover 106 are respectively connected with a closed separation tank 107, the closed separation tank 107 comprises a tank body 30 with a closed top, the bottom of the tank body 30 is provided with support legs 9, the side wall of the tank body 30 is provided with a liquid outlet N1 and a liquid outlet pipe 11, the side wall of the bottom of the tank body 30 is provided with liquid low discharge ports N4, N5, a precipitate outlet N2 and a liquid inlet N3; a partition board is axially arranged in a tank body 30 to divide an inner cavity of the tank body 30 into a liquid inlet area 29 and a carbon black collecting area 28, a flexible scraper 15 in pressure contact with the top end of the partition board is arranged at the top of the tank body 30, the moving direction of the flexible scraper 15 is opposite to the flow direction of carbon black water, floating carbon black is scraped into the carbon black collecting area 28 through the rotation of the flexible scraper 15, and the carbon black of the carbon black water is separated to form clean water which is discharged from a liquid outlet N1.
In this embodiment, as shown in fig. 5, an inner cavity of the tank 30 is composed of a liquid inlet region 29, a flow-dividing region 21, a liquid blowing region 23, a clarifying region 26 and a carbon black collecting region 28, which are sequentially arranged, wherein carbon black water in the liquid inlet region 29 enters the flow-dividing region 21 from the top end of the second partition plate 2, carbon black water in the flow-dividing region 21 enters the liquid blowing region 23 from the bottom of the fourth partition plate 4, carbon black water in the liquid blowing region 23 enters the clarifying region 26 from the top end of the sixth partition plate 6, and clean water in the clarifying region 26 is discharged from a liquid outlet N1.
In this embodiment, a first inclined plate 8 is disposed on the top of the first partition plate 1 between the liquid inlet region 29 and the carbon black collecting region 28, a second inclined plate 27 is disposed on the top of the first partition plate between the carbon black collecting region 28 and the clear liquid region 26, and the first inclined plate 8 and the second inclined plate 27 are inclined in the opposite direction of the movement direction of the flexible scraper 15.
Preferably, the gradient of the inclined plate I8 is 15-30 degrees, and the radial eccentric angle of the inclined plate I8 is 5-10 degrees; the flexible scraper 15 adopts a fiber clamping rubber scraper, and the included angle between the flexible scraper 15 and the inclined plate I8 is 10-45 degrees. In the embodiment, the gradient of the inclined plate I8 is 15 degrees, and the radial eccentric angle of the inclined plate I8 is 5 degrees; the flexible scraper 15 is a rubber scraper, and the included angle between the flexible scraper 15 and the inclined plate I8 is 10 degrees.
In this embodiment, the flexible scraper 15 is connected to the inner top wall of the tank 30 through the scraper mounting seat 14, the scraper mounting seat 14 is connected to the output end of the motor 13 and is driven by the motor 13, and a speed reducer 12 is further arranged between the motor 13 and the scraper mounting seat 14.
In this embodiment, in order to facilitate the removal of deposited solids, a subsea valve is disposed at the bottom of each partitioned area in the tank 30, so as to facilitate the timely discharge of the sediments accumulated in the tank.
In the embodiment, the upright column 16 is arranged in the middle of the tank 30, the side edges of the partition plates are respectively connected with the inner wall of the tank 30 and the upright column 16, one end of the inclined plate I8 and one end of the inclined plate II 27 are connected with the upright column 16, and the other end of the inclined plate I and the other end of the inclined plate II are connected with the inner wall of the separation tank 30.
Referring to fig. 1, a clean water outlet N1 of the closed separation tank 107 is communicated with the stripper 109, a stripping gas outlet of the stripper 109 is communicated with a gas-liquid separation tank 111, the gas-liquid separation tank 111 is connected with a cracked gas system, and a liquid outlet N1 of the stripper 109 is communicated with a hyperbolic cooling tower 112; the closed separation tank 107 is also connected to the acetylene furnace 103, and part of the clean water obtained after the carbon black separation is directly introduced into the acetylene furnace 103 for quenching. The hyperbolic cooling tower 112 connects the acetylene furnace 103 and the cooling tower 104 with the dust remover 106, and cold water from the hyperbolic cooling tower 112 is used as quenching water in the acetylene furnace 103 and cooling water in the cooling tower 104 and washing water in the dust remover 106.
In this embodiment, the stripper column 109 is essentially a packed column, stainless steel packings spaced from saddle rings are used as packing in the stripper column, and the absolute pressure level of the stripper column is 40 to 60 KPa. Meanwhile, the stripping tower is connected with an acetylene tail gas pipe 113, and the acetylene tail gas is used as stripping gas. A spray part is provided in the stripper, and clean water from the closed separation tank 107 is sprayed by the spray part.
The method and principle of the device in this embodiment are similar to those in embodiment 1.
Claims (18)
1. Device of desorption natural gas system volatility organic matter, including oxygen preheater (101), natural gas preheater (102), cooling tower (104) that link to each other with acetylene furnace (103) respectively, dust remover (106) are connected in cooling tower (104), its characterized in that: the acetylene furnace (103), the cooling tower (104) and the dust remover (106) are respectively connected with a closed separating tank (107), a clean water outlet of the closed separating tank (107) is communicated with the gas stripping tower (109), and clean water formed after carbon black water is separated from carbon black in the closed separating tank (107) is sent to the gas stripping tower (109) for degassing.
2. The apparatus of claim 1, wherein: the closed separating tank (107) comprises a tank body (30) with a closed top, a partition plate is axially arranged in the tank body (30) to divide an inner cavity of the tank body (30) into a liquid inlet area (29) and a carbon black collecting area (28), a flexible scraper (15) in pressure contact with the top end of the partition plate is arranged at the top of the tank body (30), the moving direction of the flexible scraper (15) is opposite to the flowing direction of carbon black water, floating carbon black is scraped into the carbon black collecting area (28) through the rotation of the flexible scraper (15), and a clean water liquid outlet is formed after the carbon black of the carbon black water is separated and enters the stripping tower (109).
3. The apparatus of claim 2, wherein: the inner cavity of the tank body (30) is divided into a liquid inlet area (29), a baffling area and/or a liquid blowing area and/or a clear liquid area (26) and a carbon black collecting area (28) by a partition plate.
4. The apparatus of claim 1, 2 or 3, wherein: the inner cavity of the tank body (30) of the closed separation tank (107) is composed of a liquid inlet area (29), a first deflection area (21), a first liquid blowing area (22), a second deflection area (23), a second liquid blowing area (25), a clarified liquid area (26) and a carbon black collecting area (28) which are sequentially arranged.
5. The apparatus of claim 4, wherein: carbon black water in the liquid inlet area (29) enters the first baffling area (21) from the top end of the second partition plate (2), carbon black water in the first baffling area (21) enters the first liquid baffling area (22) from the bottom of the third partition plate (3), carbon black water in the first liquid baffling area (22) enters the second baffling area (23) from the top end of the fourth partition plate (4), carbon black water in the second baffling area (23) enters the second liquid baffling area (25) from the bottom of the fifth partition plate (5), carbon black water in the second liquid baffling area (25) enters the clarified liquid area (26) from the top end of the sixth partition plate (6), and clean water in the clarified liquid area (26) is discharged from a liquid outlet.
6. The apparatus of claim 5, wherein: the top of the first partition board (1) between the liquid inlet area (29) and the carbon black collecting area (28) is provided with a first inclined board (8), the top of the partition board between the carbon black collecting area (28) and the clarified liquid area (26) is provided with a second inclined board (27), and the first inclined board (8) and the second inclined board (27) are inclined along the opposite direction of the movement direction of the flexible scraper (15).
7. The apparatus of claim 6, wherein: the gradient of the inclined plate I (8) is 15-30 degrees, and the radial eccentric angle of the inclined plate I (8) is 5-10 degrees; the flexible scraper (15) adopts a fiber clamping rubber scraper, and the included angle between the flexible scraper (15) and the inclined plate I (8) is 10-45 degrees.
8. The apparatus of claim 7, wherein: the flexible scraper (15) is connected to the inner top wall of the tank body (30) through a scraper mounting seat (14), and the scraper mounting seat (14) is connected with the output end of the motor (13) and driven through the motor (13).
9. The apparatus according to any one of claims 1-8, wherein: a stripping gas outlet of the stripping tower (109) is communicated with a gas-liquid separation tank (111), the gas-liquid separation tank (111) is connected with a cracked gas system, and a liquid outlet of the stripping tower (109) is communicated with a hyperbolic cooling tower (112).
10. The apparatus of claim 9, wherein: the closed separation tank (107) is also communicated with the acetylene furnace (103), and part of clean water obtained after carbon black separation is directly led to the acetylene furnace (103) for quenching.
11. The apparatus of claim 10, wherein: the hyperbolic water cooling tower (112) is connected with the acetylene furnace (103) and/or the cooling tower (104) and/or the dust remover (106), and cold water from the hyperbolic water cooling tower (112) is used as quenching water in the acetylene furnace (103) and/or cooling water in the cooling tower (104) and/or washing water in the dust remover (106).
12. The apparatus of claim 11, wherein: the gas stripping tower (109) adopts a vacuum gas stripping tower.
13. The apparatus of claim 12, wherein: the packing in the gas stripping tower (109) adopts random packing or regular packing, and the absolute pressure level of the gas stripping tower (109) is 40-60 KPa.
14. The apparatus of claim 13, wherein: the stripping tower (109) is connected with an acetylene tail gas pipe (113), and the acetylene tail gas is used as stripping gas.
15. The apparatus of claim 14, wherein: a spray part is arranged in the stripping tower (109), and clean water from the closed separation tank (107) is sprayed by the spray part.
16. A method for removing volatile organic compounds in a system for preparing acetylene from natural gas, which adopts the device as claimed in any one of claims 1 to 15, and comprises the following steps:
step 1, conveying carbon black water discharged from the bottoms of an acetylene furnace (103), a cooling tower (104) and an electric dust collector (106) to a closed separation tank (107) for separating carbon black from water to obtain clean water;
step 2, sending a part of the clean water obtained in the step 1 into a stripping tower (109), removing organic gas in the clean water, then sending the clean water into a cracking gas system to recover acetylene in the clean water, and sending the other part of the clean water into an acetylene furnace (103) for quenching; the degassed clean water from the bottom of the stripping tower (109) is sent to a hyperbolic cooling tower (112) to be cooled and then used as quenching water in the acetylene furnace (103) and/or cooling water in the cooling tower (104) and/or washing water in the dust remover (106).
17. The apparatus of claim 16, wherein: the residence time of the carbon black water in the closed separating tank (107) is controlled to be 9 to 11 minutes.
18. The apparatus of claim 17, wherein: the volume ratio of stripping gas entering the stripping tower (109) to clean water under the standard state is 0.8:1-2: 1.
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