CN212283442U - Active carbon adsorption treatment device for recovering trichloroethane - Google Patents
Active carbon adsorption treatment device for recovering trichloroethane Download PDFInfo
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- CN212283442U CN212283442U CN202020696875.0U CN202020696875U CN212283442U CN 212283442 U CN212283442 U CN 212283442U CN 202020696875 U CN202020696875 U CN 202020696875U CN 212283442 U CN212283442 U CN 212283442U
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Abstract
The utility model discloses a retrieve trichloroethane's active carbon adsorption processing apparatus belongs to organic waste gas adsorption processing field. The device comprises a waste gas fan, a desorption fan, an adsorption tower, a condenser, a heating device, a temperature monitoring device and a solvent receiving tank, wherein the waste gas fan is connected with a waste gas conveying pipeline, waste gas is sent into the adsorption tower filled with active carbon for adsorption treatment, and the treated waste gas reaching the standard is discharged through a pipeline; the desorption fan is connected with a heating device, heats air to a proper temperature, and sends the air into the adsorption tower which is saturated by adsorption through a pipeline for desorption, desorption gas is input into a condenser through the pipeline for condensation and recovery, and uncondensed gas is converged into the waste gas fan for continuous treatment; the inside of heating device, hot-air desorption pipeline and adsorption tower all is equipped with temperature monitoring device and is used for controlling the temperature of desorption hot-air. The device can be used for recovering trichloroethane and trichloromethane in organic waste gas, avoids the corrosion of equipment caused by steam recovery and has high nitrogen recovery cost.
Description
Technical Field
The utility model belongs to organic waste gas adsorbs the processing field, and more specifically says, relates to an active carbon adsorption processing apparatus who retrieves trichloroethane.
Background
Volatile Organic Compounds (VOCs) are organic compounds participating in atmospheric photochemical reactions, including non-methane hydrocarbons (alkanes, alkenes, alkynes, aromatics, etc.), oxygen-containing organic compounds (aldehydes, ketones, alcohols, ethers, etc.), chlorine-containing organic compounds, nitrogen-containing organic compounds, sulfur-containing organic compounds, etc., and are important precursors for the formation of ozone and fine particulate pollutants. At present, PM is adopted in China2.5And O3The form of atmospheric load pollution, which is a characteristic pollutant, remains severe as PM2.5And O3The important precursor of the organic compound is the volatile organic compound playing an extremely important role in the atmospheric chemical reaction process, and the effective solution of the pollution of the volatile organic compound is imminent.
Chemical and pharmaceutical enterprises use a large amount of various solvents in product synthesis, including halogenated hydrocarbon solvents such as trichloromethane, trichloroethane and the like. Along with the stricter environmental protection supervision, the tail gas discharge port is provided with a pollutant online monitoring facility, and chemical enterprises are required to effectively treat solvents such as trichloromethane, trichloroethane and the like. Activated carbon adsorption and desorption processes are increasingly widely applied to recovery of chloroform and trichloroethane solvents, and the adsorption performance of an adsorbent can be recovered only by adopting desorption after the adsorption reaches saturation. The steam regeneration process is widely applied in terms of cost, safety and solvent recovery.
In the practical application process, the active carbon adsorption recovery device for recovering the trichloromethane or the trichloroethane by adopting the water vapor desorption regeneration has the advantages that the corrosion of the steel plate and the metal wire mesh for supporting the active carbon inside is very serious, and the active carbon adsorption device is finally collapsed, so that the active carbon adsorption device is damaged and loses efficacy, and the safety risk is easily caused. Mainly because the trichloromethane and the trichloroethane can decompose HCl under the action of steam at about 120 ℃, and have stronger corrosivity in a wet state. Halogen solvents such as trichloroethane and the like are hydrolyzed under the conditions of temperature rise and pressurization, and are decomposed at the highest speed when the temperature reaches 130-140 ℃, so that corrosive substances such as HCl and the like are generated, and the adsorption device is damaged.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that prior art exists, the technical problem that utility model will solve lies in providing an active carbon adsorption processing apparatus who retrieves trichloroethane.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts as follows:
an activated carbon adsorption treatment device for recovering trichloroethane is characterized by comprising a waste gas fan, a desorption fan, an adsorption tower, a condenser, a heating device, a temperature monitoring device, a solvent receiving tank, a filter and a buffer tank, wherein the filter is arranged on a pipeline connected between an air inlet of the waste gas fan and a waste gas pipe; the air inlet of the desorption fan is an air inlet, the air outlet of the desorption fan is connected with a heating device and then connected with a hot air desorption pipeline, the hot air desorption pipeline is communicated with the top of the adsorption tower through a hot air branch pipe, the bottom of the adsorption tower is communicated with a desorption gas pipeline, the desorption gas pipeline is connected with a desorption gas main pipe, the desorption gas main pipe is connected with a condenser, and the lower end of the condenser is connected with a solvent receiving tank through a recovery pipe; a buffer tank is arranged in the middle of the pipe section of the recovery pipe, the buffer tank is communicated with a noncondensable gas main pipe through a non-condensable gas pipe, and the upper end of the solvent receiving tank is also communicated with the noncondensable gas main pipe through the non-condensable gas pipe; the non-condensable gas main pipe is connected with an air inlet of the waste gas fan through an access filter; temperature monitoring devices are arranged in the heating device, the hot air desorption pipeline and the adsorption tower; the inside of the adsorption tower is filled with active carbon as an adsorption medium; a valve is arranged on the tail gas discharge pipe; the hot air branch pipe is provided with a valve; the air inlet branch pipe is provided with a valve; the desorption gas pipeline is provided with a valve.
Preferably, the number of the adsorption columns is not less than 2.
Preferably, the valve arranged on the tail gas discharge pipe is a pneumatic valve.
Preferably, the valve arranged on the hot air branch pipe is a pneumatic valve.
Preferably, the valve arranged on the air inlet branch pipe is a pneumatic valve.
Preferably, the valve arranged on the desorption gas pipeline is a pneumatic valve.
Preferably, a first butterfly valve is arranged between the hot air branch pipe arranged on the valve and the temperature monitoring device; the hot air desorption pipeline between the first butterfly valve on the hot air desorption pipeline and the temperature monitoring device, the hot air desorption pipeline is connected with the accident discharge pipeline through the second butterfly valve.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides an active carbon adsorption processing apparatus of trichloroethane uses 120 ℃ hot-air to carry out the desorption to the active carbon that adsorbs the trichloroethane (the hot-air desorption should not be used for retrieving flammable solvent, but halogen solvents such as trichloroethane and trichloromethane are nonflammable, indeplosive, can adopt the hot-air to carry out the desorption). When the hot air desorption is adopted, the whole operation working condition is dry, the equipment corrosion can not be caused, the drainage treatment is not needed, the fire can not be caused, and the operation cost is low. In order to control the temperature in the adsorption device not to exceed 125 ℃ in the desorption process, temperature sensors are arranged in the desorption pipeline and the adsorption tower filled with the activated carbon and are in linkage control with the air heating device, so that the temperature of hot air in the desorption process is ensured not to exceed 125 ℃. Trichloroethane in the desorbed air is recovered through the condenser, and uncondensed gas is circularly sent into the device to be adsorbed and desorbed again, so that the desorption efficiency is improved. Compared with the water vapor desorption, the method does not need water drainage, is convenient for material separation, has low operation cost, and has low operation cost compared with the nitrogen desorption; the utility model discloses simple structure, reasonable in design easily makes.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Example 1
As shown in figure 1, the active carbon adsorption treatment device for recovering trichloroethane comprises a waste gas fan 1, a desorption fan 2, an adsorption tower 3, a condenser 4 and an automatic heating device 5, the device comprises a temperature monitoring device 6, a solvent receiving tank 7, a filter 23 and a buffer tank 24, wherein the filter 23 is arranged on a pipeline connected between an air inlet of a waste gas fan 1 and a waste gas pipe 8, an air outlet of the waste gas fan 1 is connected with an air inlet main pipe 9 and an accident discharge pipeline 10 through a three-way valve 11, the air inlet main pipe 9 is connected with three air inlet branch pipes 12, the three air inlet branch pipes 12 are respectively communicated with the bottoms of three adsorption tower bottoms 3, the tops of the three adsorption tower bottoms 3 are all communicated with a tail gas discharge pipe 13, the tail gas discharge pipe 13 is connected into a treated waste gas discharge main pipe 14, and the treated waste gas discharge main pipe 14 is connected into; one pneumatic valve 25 is arranged on each exhaust gas discharge pipe 13, and one pneumatic valve 25 is arranged on each intake branch pipe 12.
An air inlet of the desorption fan 2 is an air inlet, an air outlet of the desorption fan is connected with the automatic heating device 5 and then connected with a hot air desorption pipeline 16, the hot air desorption pipeline 16 is respectively communicated with the tops of the three adsorption tower bottoms 3 through three hot air branch pipes 17, the bottoms of the three adsorption tower bottoms 3 are respectively communicated with three desorption gas pipelines 18, all the desorption gas pipelines 18 are connected into a desorption gas main pipe 19, the desorption gas main pipe 19 is connected into the condenser 4, and the lower end of the condenser 4 is connected into the solvent receiving tank 7 through a recovery pipe 20; a buffer tank 24 is arranged in the section of the recovery pipe 20, the upper end of the buffer tank 24 is connected with the uncondensed gas pipe 21 and communicated with the uncondensed gas main pipe 22, and the upper end of the solvent receiving tank 7 is also communicated with the uncondensed gas main pipe 22 through the uncondensed gas pipe 21; the uncondensed gas main pipe 22 is connected with a filter 23 and is connected with the air inlet of the waste gas fan 1; the automatic heating device 5, the hot air desorption pipeline 16 and the three adsorption towers 3 are internally provided with temperature monitoring devices 6; active carbon is filled in the three adsorption towers 3 as an adsorption medium for adsorbing trichloroethane; each hot air branch pipe 17 is provided with a pneumatic valve 25; each desorption gas pipe 18 is also provided with a pneumatic valve 25; a first butterfly valve 27 is arranged on the hot air desorption pipeline 16 and is arranged between the hot air branch pipe 17 and the temperature monitoring device 6; between the first butterfly valve 27 on the hot air desorption line 16 and the temperature monitoring device 6, the hot air desorption line 16 is also connected to the accident discharge line 10 via a second butterfly valve 28.
The utility model discloses the operation explanation: waste gas is sent into the adsorption tower 3 through the waste gas fan 1 for adsorption treatment, the treated tail gas reaching the standard is discharged to the accident discharge pipeline 10 through the tail gas discharge pipe 13 and the treated waste gas discharge main pipe 14 to be directly discharged or enters a subsequent working section, and the waste gas is directly discharged through the accident discharge pipeline 10 during the accident working condition. In fig. 1, 3 adsorption towers 3 adsorb according to 2 adsorption towers 3, and the work condition of desorption of one adsorption tower 3 is carried out. After the adsorption tower 3 is saturated, the desorption fan 2 is started to blow air, the air is heated to 120 ℃ by the automatic heating device 5, and the air is sent to the adsorption tower 3 to desorb the trichloroethane. Through carrying out temperature chain control to self-heating device 5, the temperature monitoring device 6 that sets up in hot-air desorption pipeline 16 and the three adsorption tower 3, control desorption air temperature, and then adjust self-heating device 5's output, guarantee that the temperature of desorption air is not higher than 125 ℃, if desorption air temperature is higher than 125 ℃ then the desorption air discharges out through accident discharge pipe 10, prevent to cause the trichloroethane to decompose and produce corrosive medium because the high temperature, cause destruction to the adsorption device. The trichloroethane solvent and the hot air desorbed from the adsorption tower 3 are condensed by a condenser 4, and the separated trichloroethane solvent flows into a solvent receiving tank 7 for recycling. The uncondensed tail gas of the condenser 4 and the emptying tail gas of the solvent receiving tank 7 are sent into the waste gas fan 1 through the uncondensed gas pipe 21 and the uncondensed gas header pipe 22 for further absorption and desorption treatment, so that the recovery rate of trichloroethane is improved.
Through practical test, a certain enterprise adopts the utility model discloses the trichloroethane is retrieved to the device, and trichloroethane waste gas flow is 3100m3H, average inlet concentration of 5869.9mg/m3The outlet average concentration is 448.3mg/m3The removal efficiency reaches 92.36 percent.
Because trichloromethane and trichloroethane nature are similar, all are nonflammable, the noninflammable volatile organic solvent, so the utility model discloses and application method thereof also are applicable to the desorption of trichloromethane in the waste gas.
Claims (7)
1. The activated carbon adsorption treatment device for recovering trichloroethane is characterized by comprising a waste gas fan (1), a desorption fan (2), an adsorption tower (3), a condenser (4), a heating device (5), a temperature monitoring device (6), a solvent receiving tank (7), a filter (23) and a buffer tank (24), wherein the filter (23) is arranged on a pipeline connected between a gas inlet of the waste gas fan (1) and a waste gas pipe (8), a gas outlet of the waste gas fan (1) is connected with a gas inlet main pipe (9) and an accident discharge pipeline (10) through a three-way valve (11), the gas inlet main pipe (9) is connected with a gas inlet branch pipe (12), the gas inlet branch pipe (12) is communicated with the bottom of the adsorption tower (3), the top of the adsorption tower (3) is communicated with a tail gas discharge pipe (13), and the tail gas discharge pipe (13) is connected into a treated waste gas discharge main pipe (14), the treated waste gas discharge main pipe (14) is connected into an accident discharge pipeline (10); the air inlet of the desorption fan (2) is an air inlet, the air outlet of the desorption fan is connected with a heating device (5) and then connected with a hot air desorption pipeline (16), the hot air desorption pipeline (16) is communicated with the top of the adsorption tower (3) through a hot air branch pipe (17), the bottom of the adsorption tower (3) is communicated with a desorption gas pipeline (18), the desorption gas pipeline (18) is connected with a desorption gas main pipe (19), the desorption gas main pipe (19) is connected with the condenser (4), and the lower end of the condenser (4) is connected with the solvent receiving tank (7) through a recovery pipe (20); a buffer tank (24) is arranged in the middle of the pipe section of the recovery pipe (20), the buffer tank (24) is communicated with the uncondensed gas main pipe (22) through being connected with an uncondensed gas pipe (21), and the upper end of the solvent receiving tank (7) is also connected with the uncondensed gas pipe (21) and communicated with the uncondensed gas main pipe (22); the non-condensable gas main pipe (22) is connected with an air inlet of the waste gas fan (1) through an access filter (23); the heating device (5), the hot air desorption pipeline (16) and the adsorption tower (3) are internally provided with temperature monitoring devices (6); the inside of the adsorption tower (3) is filled with active carbon as an adsorption medium; a valve (25) is arranged on the tail gas discharge pipe (13); a valve (25) is arranged on the hot air branch pipe (17); a valve (25) is arranged on the air inlet branch pipe (12); and a valve (25) is arranged on the desorption gas pipeline (18).
2. The activated carbon adsorption treatment device for recovering trichloroethane according to claim 1, wherein the number of the adsorption towers is not less than 2.
3. The activated carbon adsorption treatment device for recovering trichloroethane according to claim 1, wherein the valve (25) provided on the tail gas discharge pipe (13) is a pneumatic valve (25).
4. The activated carbon adsorption treatment device for recovering trichloroethane according to claim 1, wherein the valve (25) provided on the hot air branch pipe (17) is a pneumatic valve (25).
5. The activated carbon adsorption treatment device for recovering trichloroethane according to claim 1, wherein the valve (25) provided on the gas inlet branch pipe (12) is a pneumatic valve (25).
6. The activated carbon adsorption treatment device for recovering trichloroethane according to claim 1, wherein the valve (25) provided in the desorption gas conduit (18) is a pneumatic valve (25).
7. The activated carbon adsorption treatment device for recovering trichloroethane according to claim 1, wherein a first butterfly valve (27) is arranged between the hot air branch pipe (17) on the hot air desorption pipeline (16) and the temperature monitoring device (6); between the first butterfly valve (27) on the hot air desorption pipeline (16) and the temperature monitoring device (6), the hot air desorption pipeline (16) is connected with the accident discharge pipeline (10) through a second butterfly valve (28).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020696875.0U CN212283442U (en) | 2020-04-29 | 2020-04-29 | Active carbon adsorption treatment device for recovering trichloroethane |
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| CN202020696875.0U CN212283442U (en) | 2020-04-29 | 2020-04-29 | Active carbon adsorption treatment device for recovering trichloroethane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112957876A (en) * | 2021-02-02 | 2021-06-15 | 江阴联众环保工程有限公司 | Treatment device for treating waste gas containing dichloroethane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112957876A (en) * | 2021-02-02 | 2021-06-15 | 江阴联众环保工程有限公司 | Treatment device for treating waste gas containing dichloroethane |
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