CN102029148A - Dry method desorption device for organic waste gas activated carbon adsorption - Google Patents

Abstract

The invention relates to a dry desorption device for activated carbon adsorption of organic waste gas, which includes an adsorption tank filled with activated carbon, a waste gas delivery channel, a clean gas delivery channel, a steam generating device, and a solvent recovery device. The waste gas pipe and the steam pipe used to flow through the desorption steam. The steam pipe is set in the waste gas pipe, and the activated carbon is filled in the waste gas pipe and outside the steam pipe. The recovery device is also equipped with a vacuum pump. When the desorption part works, the vacuum pump will recover The device is evacuated to vacuum. The present invention realizes the adsorption and desorption through two paths in the same adsorption tank, the activated carbon does not directly contact with the water vapor, keeps it dry, and avoids the problem caused by the desorption of the activated carbon directly through the water vapor to make the activated carbon absorb water. The reduction of adsorption capacity and the secondary pollution caused by the combination of water vapor and solvent during the desorption process. Its advantages are as follows: save energy; avoid pollution; reduce costs.

Description

Dry desorption device for activated carbon adsorption of organic waste gas

technical field

The invention relates to the field of waste gas treatment, in particular to a dry desorption device for activated carbon adsorption of organic waste gas. the

Background technique

Activated carbon has a good specific surface area and strong adsorption, decolorization and deodorization properties, so it is often used as an adsorption medium in a circular purification system to absorb toxic and polluting substances in waste gas and wastewater. the

At present, the most commonly used adsorption-desorption recovery devices mainly include: air filter, adsorption tank, condenser, separator, detonator, etc. Two or more adsorption tanks are used simultaneously or alternately. The adsorption process is as follows: exhaust gas passes through the air filter to remove tiny suspended particles, then enters the top of the adsorption tank, and after being adsorbed by activated carbon in the tank, harmful components are removed, and the purified gas that meets the emission standards is discharged to the outside through the fan. On the contrary, its desorption regeneration process is as follows: After the activated carbon has been used for a period of time, a certain amount of solvent is adsorbed on its surface (the length of use depends on the weight content and production time), and desorption regeneration is required. During regeneration, steam is sprayed from the bottom of the tank to evaporate the solvent adsorbed in the activated carbon, and then condensed into a liquid through the condenser, then enters the separation cylinder, separates and recovers the organic solvent, and the residual liquid enters the detonator, and is discharged after degassing. the

With reference to the Chinese patent application number "200510200344.8", a "new process for automatic recovery of industrial organic waste gas" is disclosed. The patent adopts the method of water vapor desorption and static layered recovery. Although the use of water vapor desorption has the characteristics of high phase change heat, relatively complete desorption, and easy condensation, but it also has the same disadvantages as traditional desorption: during desorption, a large amount of water vapor will condense in the adsorption layer of activated carbon. , although it has been blown by dry wind, the water content of activated carbon is still very high, which affects its adsorption performance and reduces the adsorption efficiency; in addition, the temperature of water vapor is relatively high, and if the adsorption process needs to be carried out immediately after desorption, the activated carbon will be activated at a higher temperature. The situation will also affect its desorption efficiency. Therefore to overcome the above-mentioned technical problems, it is necessary to add appropriate equipment and processing technology, which increases the production cost and requires a large investment. the

Contents of the invention

The purpose of the present invention is to provide a dry desorption device that adopts dry desorption of organic solvents such as benzene, alcohol, ketone, fat, gasoline, etc. to adsorb waste gas activated carbon. the

In order to achieve the above object, the technical scheme adopted in the present invention is:

A dry desorption device for activated carbon adsorption of organic waste gas, which includes a plurality of adsorption tanks filled with activated carbon arranged in parallel, a waste gas delivery channel for transporting organic waste gas, a clean gas delivery channel for transporting purified gas, and The steam generating device for producing high-temperature desorption steam and the solvent recovery device for collecting desorption solvents, the exhaust gas delivery channel, the adsorption tank, and the clean gas delivery channel constitute the adsorption part, and the steam generation device, the adsorption tank, The solvent recovery device constitutes the desorption part. The adsorption tank is provided with a waste gas pipe for flowing through the organic waste gas and a steam pipe for flowing through the desorption steam. The steam pipe is arranged in the waste gas pipe. It is filled in the waste gas pipe and outside the steam pipe, and the recovery device is also equipped with a vacuum pump. Before the desorption part works, the vacuum pump pumps the recovery device to a vacuum.

Preferably, the solvent recovery device includes a condenser for cooling and desorbing solvent vapor, a solvent recovery tank for collecting the cooled solvent, and the vacuum pump is connected to the solvent recovery tank. the

Preferably, the adsorption tank is provided with a pressure gauge. the

Preferably, the clean air delivery channel is provided with an induced fan. the

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages and effects compared with the prior art:

The present invention realizes the adsorption and desorption through two paths in the same adsorption tank. During the desorption, high-temperature steam is introduced into the steam pipeline in a negative pressure environment to desorb the activated carbon outside the pipe, and the activated carbon does not interact with water. The steam is in direct contact with each other to keep it dry, avoiding the reduction of the adsorption capacity caused by the desorption of the activated carbon directly through the water vapor to make the activated carbon absorb water, and the secondary pollution caused by the combination of water vapor and the solvent during the desorption process. . Its advantages are as follows:

(1), saving energy; (2), avoiding pollution; (3), reducing costs. the

Description of drawings

Accompanying drawing 1 is a structural representation of the present invention;

Accompanying drawing 2 is the structural representation of the adsorption tank of the present invention.

Among them: 1. Adsorption tank; 2. Waste gas delivery channel; 3. Clean gas delivery channel; 4. Waste gas pipe; 5. Steam pipe; 6. Activated carbon; 7. Vacuum pump; 8. Condenser; 9. Solvent recovery tank; 10 , pressure gauge; 11, induced draft fan; 12, pipeline.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

A dry desorption device for activated carbon adsorption of organic waste gas as shown in Figure 1, which includes a plurality of adsorption tanks 1 filled with activated carbon 6 arranged in parallel, a waste gas delivery channel 2 for transporting organic waste gas, and a waste gas delivery channel for transporting Clean gas delivery channel 3 for purified gas, steam generating device for producing high-temperature desorption steam, and solvent recovery device for collecting desorption solvent.

The exhaust gas delivery channel 2, the adsorption tank 1, and the clean gas delivery channel 3 constitute the adsorption part; the steam generating device (not shown in the figure), the adsorption tank 1 and the solvent recovery device constitute the desorption part. The adsorption tank 1 is provided with a waste gas pipe 4 for flowing through the organic waste gas and a steam pipe 5 for flowing through the desorption steam. The steam pipe 5 is arranged in the waste gas pipe 4, and the activated carbon 6 is filled in the waste gas pipe 4. outside. Wherein: the solvent recovery device includes a condenser 8 for cooling and desorption of solvent vapor, a solvent recovery tank 9 for collecting the cooled solvent; the recovery device is also provided with a vacuum pump 7, and the vacuum pump 7 is connected with the solvent recovery tank 9; Tank 1 is also provided with pressure gauge 10, to ensure that when working, the pressure reading in adsorption tank 1; attached. the

In addition, the clean air delivery channel 3 is provided with an induced draft fan 11 . The various elements of the whole recovery device are connected through pipelines 12 . the

The operation method of the present embodiment is set forth below in detail:

(1) The organic waste gas to be treated is filtered by the filtration and cooling system to filter out large particles of impurities, and then enters the waste gas conveying channel 2 after being cooled, and the organic waste gas enters the adsorption tank 1 for adsorption work through the waste gas conveying channel 2 , in the adsorption tank 1, the organic waste gas flows through the waste gas pipe 4, and under the adsorption of the activated carbon 6 filled therein, the organic solvent gases such as benzene, alcohol, ketone, fat, etc. contained in it are filtered out. Of course, the adsorption can also be selected Activated carbon fibers with better functions are discharged from the recovery system from the clean air delivery channel 3 under the action of the induced draft fan 11. During the adsorption process, the pressure of the entire recovery device is positive;

(2) When activated carbon 6 absorbs a certain amount of solvent, desorption is carried out. Before desorption, the recovery system is evacuated to vacuum by vacuum pump 7. After the pressure gauge 10 is used to confirm that the system is in a negative pressure environment, desorption is carried out. , using a steam generating device to generate high-temperature steam with a temperature of 115 to 125 degrees, especially when the steam temperature is 120 degrees, the steam flows through the steam pipe 5 and transfers heat to the activated carbon 6, and the solvent adsorbed in the activated carbon 6 is evaporated, passed The pipeline 12 is transported to the solvent recovery unit;

(3) The solvent vapor is cooled in the condenser 8 of the solvent recovery device, and after cooling, it becomes an organic solution and is stored in the solvent recovery tank 9 for other utilization.

In the present embodiment, after the activated carbon 6 of one adsorption tank 1 is adsorbed and saturated, its desorption part works, and when the gas is pumped to a vacuum by the vacuum pump 7, a small amount of gas will enter the adsorption part of another adsorption tank 1 ', Make it still possible to carry out adsorption work. the

In this way, during the entire desorption process, the high-temperature steam does not directly contact the activated carbon, the activated carbon is always kept dry, and its adsorption performance will not be affected by insufficient drying after desorption, which improves the service life and adsorption efficiency of the activated carbon; at the same time , It also avoids the secondary pollution caused by the combination of water vapor and solvent during the desorption process. the

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention. the

the

Claims (4)

1. A dry desorption device for activated carbon adsorption of organic waste gas, which includes a plurality of adsorption tanks filled with activated carbon arranged in parallel, a waste gas delivery channel for transporting organic waste gas, and a clean gas delivery channel for transporting purified gas , a steam generating device for producing high-temperature desorption steam, a solvent recovery device for collecting desorption solvents, the exhaust gas delivery channel, adsorption tank, and clean gas delivery channel constitute the adsorption part, and the steam generation device, adsorption The tank and the solvent recovery device constitute the desorption part, and it is characterized in that: the waste gas pipe for flowing through the organic waste gas and the steam pipe for flowing through the desorption steam are arranged in the adsorption tank, and the steam pipe is arranged at the In the waste gas pipe described above, activated carbon is filled in the waste gas pipe and outside the steam pipe, and the recovery device is also provided with a vacuum pump. When the desorption part works, the vacuum pump pumps the recovery device to vacuum. 2. The dry desorption device for activated carbon adsorption of organic waste gas according to claim 1, characterized in that: the solvent recovery device includes a condenser for cooling and desorbing solvent vapor, a condenser for collecting the cooled solvent The solvent recovery tank, the vacuum pump is connected with the solvent recovery tank. 3. The dry desorption device for activated carbon adsorption of organic waste gas according to claim 1, characterized in that: said adsorption tank is provided with a pressure gauge. 4. The dry desorption device for activated carbon adsorption of organic waste gas according to claim 1, characterized in that: said clean air delivery channel is provided with an induced draft fan.

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