System for reducing desorption residues in adsorption device

Abstract

The utility model relates to the technical field of waste gas recovery and treatment, in particular to a system for reducing desorption residues in an adsorption device. A gas phase outlet end of a tail gas fan is connected with a first inlet end at the bottom of an activated carbon adsorber, and a first outlet end at the top of the activated carbon adsorber is connected with an inlet end of a chimney; the gas phase outlet end of the drying fan is connected with the second inlet end of the bottom of the activated carbon adsorber, the second outlet end of the bottom of the activated carbon adsorber is connected with the inlet end of the first-stage condenser, the outlet end of the first-stage condenser is connected with the inlet end of the second-stage condenser, and the outlet end of the second-stage condenser is connected with the inlet end of the gas-liquid separator. The gas phase outlet end of the gas-liquid separator is connected with the inlet end of the tail gas fan; a third outlet end at the bottom of the activated carbon adsorber is connected with an inlet end of a cooler; an outlet end of the cooler is connected with an inlet end of a tail gas fan; according to the utility model, the service life of activated carbon is prolonged, and the adsorption efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste gas recovery and treatment, relates to the organic gas adsorption and recovery technology, and particularly relates to a system for reducing the desorption residue in an adsorption device. Background Technique

[0002] In the industrial production and environmental protection treatment processes, adsorption devices are widely used for the removal of organic substances. However, there are some deficiencies in the existing adsorption devices during use. On the one hand, during the desorption process, there are often residual organic substances that cannot be completely treated, and these organic substances are easily blown into the exhaust stack, resulting in non-compliant emissions in a short period of time and causing environmental pollution. On the other hand, due to the existence of residual organic substances, the regeneration of the carbon layer is not clean enough, reducing the service life of the activated carbon and increasing the replacement cost. At the same time, the adsorption efficiency of the existing adsorption devices also needs to be improved, and it cannot meet the increasingly strict environmental protection requirements and the needs of high-efficiency production. In addition, traditional adsorption devices also have problems such as high energy consumption and lack of environmental protection during the treatment process.

[0003] To solve these problems, the utility model provides a system for reducing the desorption residue in an adsorption device, aiming to ensure the compliance of exhaust emissions, extend the service life of the activated carbon, improve the adsorption efficiency, and at the same time achieve an energy-saving, efficient, and environmentally friendly treatment process. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an energy-saving system for reducing the desorption residue in an adsorption device, aiming to ensure the compliance of exhaust emissions, extend the service life of the activated carbon, improve the adsorption efficiency, and at the same time achieve an energy-saving, efficient, and environmentally friendly treatment process.

[0005] The utility model solves its technical problems by adopting the following technical solutions:

[0006] A system for reducing the desorption residue in an adsorption device includes: a tail gas fan, an activated carbon adsorber, a chimney, a drying fan, a primary condenser, a secondary condenser, a gas-liquid separator, and a cooler. The gas-phase outlet end of the tail gas fan is connected to the first inlet end at the bottom of the activated carbon adsorber, and the first outlet end at the top of the activated carbon adsorber is connected to the inlet end of the chimney; the gas-phase outlet end of the drying fan is connected to the second inlet end at the bottom of the activated carbon adsorber, the second outlet end at the bottom of the activated carbon adsorber is connected to the inlet end of the primary condenser, the outlet end of the primary condenser is connected to the inlet end of the secondary condenser, the outlet end of the secondary condenser is connected to the inlet end of the gas-liquid separator, and the gas-phase outlet end of the gas-liquid separator is connected to the inlet end of the tail gas fan; the third outlet end at the bottom of the activated carbon adsorber is connected to the inlet end of the cooler, and the outlet end of the cooler is connected to the inlet end of the tail gas fan.

[0007] Moreover, the liquid phase outlet end of the gas-liquid separator is connected to the inlet end of the solvent tank, and the outlet end of the solvent tank is connected to the inlet end of the solvent pump.

[0008] Moreover, the gas phase outlet end of the drying fan is connected to the inlet end of the heater, the outlet end of the heater is connected to the second inlet end at the bottom of the activated carbon adsorber, and the first outlet end at the top of the activated carbon adsorber is connected to the inlet end of the chimney.

[0009] Moreover, the gas phase outlet end of the drying fan is connected to the second inlet end at the bottom of the activated carbon adsorber, and the first outlet end at the top of the activated carbon adsorber is connected to the inlet end of the chimney.

[0010] The advantages and positive effects of the present utility model are:

[0011] The present utility model conducts air replacement through two pipelines. During the air replacement stage, the residual solvent is returned to the tail gas inlet pipeline for recycling again, instead of being directly discharged into the exhaust stack, thereby reducing the problem of excessive emissions caused by residual solvents, and having a lower cost and higher efficiency than the drying self-circulation. By replacing the residual solvent, the adsorption efficiency and the service life of the granular carbon are further improved.

[0012] The present utility model can clean up the residual organic matter, prevent this part of the organic matter from being blown into the exhaust stack and causing non-compliance of emissions in a short period of time. While ensuring the compliance of exhaust emissions, it can also regenerate the carbon layer more cleanly, effectively extend the service life of the activated carbon, reduce the replacement cost, and improve the adsorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present utility model.

[0014] REFERENCE NUMERALS

[0015] 1 - Activated carbon adsorber, 2 - Tail gas fan, 3 - Primary condenser, 4 - Secondary condenser, 5 - Gas-liquid separator, 6 - Solvent tank, 7 - Solvent pump, 8 - Drying fan, 9 - Heater, 10 - 15 - Valves, 16 - Cooler, 17 - Chimney. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments. The following embodiments are only descriptive and not restrictive, and cannot be used to limit the protection scope of the present utility model.

[0017] A system for reducing the desorption residue in an adsorption device, comprising: an exhaust gas fan 2, an activated carbon adsorber 1, a chimney 17, a drying fan 8, a primary condenser 3, a secondary condenser 4, a gas-liquid separator 5, and a cooler 16. The gas-phase outlet end of the exhaust gas fan 2 is connected to the first inlet end at the bottom of the activated carbon adsorber 1, and the first outlet end at the top of the activated carbon adsorber 1 is connected to the inlet end of the chimney 17;

[0018] The gas-phase outlet end of the drying fan 8 is connected to the second inlet end at the bottom of the activated carbon adsorber 1. The second outlet end at the bottom of the activated carbon adsorber 1 is connected to the inlet end of the primary condenser 3. The outlet end of the primary condenser 3 is connected to the inlet end of the secondary condenser 4. The outlet end of the secondary condenser 4 is connected to the inlet end of the gas-liquid separator 5. The gas-phase outlet end of the gas-liquid separator 5 is connected to the inlet end of the exhaust gas fan 2;

[0019] The third outlet end at the bottom of the activated carbon adsorber 1 is connected to the inlet end of the cooler 16, and the outlet end of the cooler 16 is connected to the inlet end of the exhaust gas fan 2.

[0020] The liquid-phase outlet end of the gas-liquid separator 5 is connected to the inlet end of the solvent tank 6, and the outlet end of the solvent tank 6 is connected to the inlet end of the solvent pump 7.

[0021] The gas-phase outlet end of the drying fan 8 is connected to the inlet end of the heater 9, the outlet end of the heater 9 is connected to the second inlet end at the bottom of the activated carbon adsorber 1, and the first outlet end at the top of the activated carbon adsorber 1 is connected to the inlet end of the chimney 17.

[0022] The gas-phase outlet end of the drying fan 8 is connected to the second inlet end at the bottom of the activated carbon adsorber 1, and the first outlet end at the top of the activated carbon adsorber 11 is connected to the inlet end of the chimney 17.

[0023] The waste gas is pressurized by the exhaust gas fan 2 and adsorbed and discharged by the activated carbon adsorber 1. After adsorption saturation, steam regeneration is adopted, and after regeneration, air is used to displace, dry, and cool the activated carbon adsorber 1.

[0024] First, the adsorption process is carried out. Valve 10 and valve 11 are opened, the exhaust gas fan 2 is started, and the exhaust gas enters from the first inlet end at the bottom of the activated carbon adsorber 1 via the exhaust gas fan 2 and is discharged from the first outlet end at the top of the activated carbon adsorber 1 via the pipeline where valve 11 is located and from the chimney 17.

[0025] Next is the steam desorption process. Valves 12 and 13 are opened. Steam enters from the top of the activated carbon adsorber 1 through the pipeline where valve 12 is located and desorbs the granular carbon bed. After the desorbed gas comes out from the second outlet end at the bottom of the activated carbon adsorber 1, it enters the primary condenser 3 and the secondary condenser 4 in sequence for cooling. After cooling, it enters the gas-liquid separator 5. The liquid enters the solvent tank 6 and is regularly pumped to the designated position through the solvent pump 7. The gas separated by the gas-liquid separator 5 is merged into the tail gas inlet pipeline for the next cycle. After the desorption is completed, valves 12 and 13 are closed.

[0026] Finally is the replacement, drying, and cooling process. Valves 13, 14, and 15 are opened, and the drying fan 8 is turned on. The heater 9 remains off. After the air comes out from the drying fan 8, it enters from the second inlet end at the bottom of the activated carbon adsorber 1 through the pipeline where valve 14 is located, displacing the residual steam and solvent. Then it comes out from the second outlet end at the bottom of the activated carbon adsorber 1 and enters the primary condenser 3 and the secondary condenser 4 in sequence for cooling. After cooling, it enters the gas-liquid separator 5, and the separated gas is merged into the tail gas inlet pipeline; or after the air comes out from the drying fan 8, it enters from the second inlet end at the bottom of the activated carbon adsorber 1 through the pipeline where valve 14 is located, displacing the residual steam and solvent. Then it comes out from the third outlet end at the bottom of the activated carbon adsorber 1 and enters the cooler 16 for cooling. The cooled gas is merged into the main tail gas pipe.

[0027] After the replacement is completed, the activated carbon adsorber 1 is dried. Valves 13 and 15 are closed, valve 11 is opened, and the heater 9 is turned on. After the air comes out from the drying fan 8, it is heated by the heater 9 and then enters from the second inlet end at the bottom of the activated carbon adsorber 1 through the pipeline where valve 14 is located. The high-temperature air evaporates and carries out the moisture inside the activated carbon adsorber 1 and is discharged from the chimney 17 through the pipeline where valve 11 is located.

[0028] After the drying is completed, the activated carbon adsorber 1 is cooled. The heater 9 is turned off. The air comes out from the drying fan 8 and enters from the second inlet end at the bottom of the activated carbon adsorber 1 through the pipeline where valve 14 is located for cooling. The cooled gas is discharged from the chimney 17 through the pipeline where valve 11 is located.

[0029] After the cooling is completed, the activated carbon adsorber 1 can carry out the next adsorption process again.

[0030] Although the embodiments and drawings of the present utility model are disclosed for illustrative purposes, those skilled in the art can understand that: without departing from the spirit and scope of the present utility model and the appended claims, various substitutions, changes, and modifications are possible. Therefore, the scope of the present utility model is not limited to the content disclosed in the embodiments and drawings.

Claims

1. A system for reducing the desorption residue in an adsorption device, characterized in that: It includes an exhaust gas fan, an activated carbon adsorber, a chimney, a drying fan, a primary condenser, a secondary condenser, a gas-liquid separator and a cooler. The gas-phase outlet end of the exhaust gas fan is connected to the first inlet end at the bottom of the activated carbon adsorber, and the first outlet end at the top of the activated carbon adsorber is connected to the inlet end of the chimney. The gas-phase outlet end of the drying fan is connected to the second inlet end at the bottom of the activated carbon adsorber, the second outlet end at the bottom of the activated carbon adsorber is connected to the inlet end of the primary condenser, the outlet end of the primary condenser is connected to the inlet end of the secondary condenser, the outlet end of the secondary condenser is connected to the inlet end of the gas-liquid separator, and the gas-phase outlet end of the gas-liquid separator is connected to the inlet end of the exhaust gas fan. The third outlet end at the bottom of the activated carbon adsorber is connected to the inlet end of the cooler, and the outlet end of the cooler is connected to the inlet end of the exhaust gas fan.

2. The system for reducing the desorption residue in the adsorption device according to claim 1, wherein: The liquid-phase outlet end of the gas-liquid separator is connected to the inlet end of the solvent tank, and the outlet end of the solvent tank is connected to the inlet end of the solvent pump.

3. The system for reducing the desorption residue in the adsorption device according to claim 2, characterized in that: The gas-phase outlet end of the drying fan is connected to the inlet end of the heater, the outlet end of the heater is connected to the second inlet end at the bottom of the activated carbon adsorber, and the first outlet end at the top of the activated carbon adsorber is connected to the inlet end of the chimney.

4. The system for reducing the desorption residue in the adsorption device according to claim 3, wherein: The gas-phase outlet end of the drying fan is connected to the second inlet end at the bottom of the activated carbon adsorber, and the first outlet end at the top of the activated carbon adsorber is connected to the inlet end of the chimney.

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