Efficient desorption device for organic gas recovery

Abstract

The utility model relates to the technical field of organic gas recovery, in particular to an efficient desorption device for organic gas recovery, which comprises an adsorption and desorption chamber, a nitrogen distributor, a first pressure transmitter, a condenser, a vortex air pump and a second pressure transmitter, a nitrogen distributor is arranged on the upper portion of the adsorption material, a first pressure transmitter is arranged on one side of the top of the outer wall of the adsorption and desorption chamber and connected with the nitrogen distributor through a nitrogen inlet pipeline, a condenser is arranged on one side of the bottom of the outer wall of the adsorption and desorption chamber, and a vortex air pump is further arranged between the condenser and the adsorption and desorption chamber. A second pressure transmitter is arranged at the top of the adsorption and desorption chamber; the adsorption performance of the adsorption material is ensured, and the generation of hazardous wastes and the related disposal cost are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of organic gas recovery, in particular to an efficient desorption device for organic gas recovery. Background Art

[0002] With the rapid development of industry, the pollution problem of organic gases generated in the production processes of industries such as medicine, pesticides, and chemical engineering is becoming increasingly serious. In the adsorption treatment process for organic gases, activated carbon and resin have become good adsorption materials due to their large specific surface area and numerous micropores, and their application proportion in the waste gas treatment of these industries is increasing.

[0003] Currently, in the adsorption process of activated carbon or resin, during desorption, saturated steam is usually depressurized through a pressure reducing valve and then the activated carbon or resin is heated. When the desorption temperature reaches the target temperature, it ends. Although this process condition can purge out most of the organic gases accumulated in the saturated activated carbon or resin, due to the problems of steam liquefying into water and the existence of desorption dead angles in the adsorber, the desorption effect is not satisfactory. Some organic gases will stay deep in the micropores of the activated carbon or resin, in the surface condensed water, and in the corner dead zones of the adsorber, and cannot all come out of the adsorber. The traditional desorption process using steam desorption will lead to the existence of liquefied water, resulting in a high residual rate of organic gases. As the residues increase, the adsorption performance in the next cycle will deteriorate, and the waste gas will quickly exceed the standard after being treated by activated carbon and resin, unable to meet the increasingly strict environmental protection requirements.

[0004] Therefore, the existing activated carbon or resin adsorption process has problems such as a high residual rate of organic gases and easy decline in adsorption performance during desorption, and there is an urgent need for an efficient desorption device for organic gas recovery to improve the treatment effect of VOCs. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an efficient desorption device for organic gas recovery, which can effectively solve the problem of more residual organic gases caused by insufficient desorption, thus resulting in poor adsorption effect of activated carbon or resin.

[0006] The utility model solves its technical problems by adopting the following technical solutions:

[0007] An efficient desorption device for organic gas recovery, comprising: an adsorption and desorption chamber, a nitrogen distributor, a first pressure transmitter, a condenser, a vortex gas pump and a second pressure transmitter. An adsorption material is arranged in the adsorption and desorption chamber, a nitrogen distributor is arranged above the adsorption material, one side of the top of the outer wall of the adsorption and desorption chamber is provided with a first pressure transmitter, the first pressure transmitter is connected to the nitrogen distributor through a nitrogen inlet pipeline, one side of the bottom of the outer wall of the adsorption and desorption chamber is provided with a condenser, a vortex gas pump is also arranged between the condenser and the adsorption and desorption chamber, and a second pressure transmitter is arranged at the top of the adsorption and desorption chamber.

[0008] Moreover, a temperature transmitter is also arranged on one side of the outer wall of the adsorption and desorption chamber.

[0009] Moreover, a nitrogen pressure reducing valve is also arranged on the nitrogen inlet pipeline, and the outlet end of the nitrogen pressure reducing valve is connected to the inlet end of the first pressure transmitter.

[0010] Moreover, a safety valve is also arranged at the top of the adsorption and desorption chamber.

[0011] The advantages and positive effects of the present utility model are:

[0012] The present utility model regenerates the granular carbon by negative pressure desorption. Desorption is carried out in a negative pressure environment, and the organic gas remaining on the adsorption material is desorbed from the micropores under the action of high heat and negative pressure, so that the adsorption performance is improved, and further the service life of the adsorption and desorption chamber is extended.

[0013] The present utility model is also provided with nitrogen desorption. When the negative pressure desorption pressure is insufficient or other situations occur, clean nitrogen is used to displace the organic gas in the adsorption and desorption chamber, and the condensate water on the surface of the adsorption material is purged through the nitrogen distributor, and the condensate water and the desorbed gas in the adsorption and desorption chamber are pushed out, ensuring the adsorption performance of the adsorption material, reducing the generation of hazardous waste and related disposal costs. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the present utility model.

[0015] Reference Signs

[0016] 1 - adsorption and desorption chamber, 2 - vortex gas pump, 3 - temperature transmitter, 4 - second pressure transmitter, 5 - condenser, 6 - nitrogen distributor, 7 - nitrogen pressure reducing valve, 8 - second pressure transmitter, 9 - safety valve. Detailed Description of the Embodiment

[0017] The present utility model will be further described in detail below in conjunction with the drawings and through specific embodiments. The following embodiments are only descriptive and not restrictive, and the protection scope of the present utility model cannot be limited thereby.

[0018] An efficient desorption device for organic gas recovery, comprising: an adsorption and desorption chamber, a nitrogen distributor, a first pressure transmitter, a condenser, a vortex gas pump and a second pressure transmitter. An adsorption material is arranged in the adsorption and desorption chamber, and a nitrogen distributor is arranged above the adsorption material. One side of the top of the outer wall of the adsorption and desorption chamber is provided with a first pressure transmitter, and the first pressure transmitter is connected to the nitrogen distributor through a nitrogen inlet pipeline. One side of the bottom of the outer wall of the adsorption and desorption chamber is provided with a condenser, and a vortex gas pump is also arranged between the condenser and the adsorption and desorption chamber. A second pressure transmitter is arranged at the top of the adsorption and desorption chamber.

[0019] A temperature transmitter is also arranged on one side of the outer wall of the adsorption and desorption chamber for displaying the temperature inside the adsorption and desorption chamber.

[0020] A nitrogen pressure reducing valve is also arranged on the nitrogen inlet pipeline, and the outlet end of the nitrogen pressure reducing valve is connected to the inlet end of the first pressure transmitter. The pressure of the first pressure transmitter is controlled to be kept below 20 KPa by adjusting the nitrogen pressure reducing valve.

[0021] A safety valve is also arranged at the top of the adsorption and desorption chamber for emergency pressure release.

[0022] Working principle: The adsorption and desorption chamber adopts a conventional steam desorption process. When the temperature rises to 100 - 110 °C, the desorption ends and the steam supply stops. At this time, when the temperature transmitter shows 100 °C and the second pressure transmitter shows 0 - 500 Pa, the vortex gas pump is started. The residual steam and organic gas in the adsorption and desorption chamber are pumped out together by the vortex gas pump and sent to the condenser for condensation. After continuous pumping, the adsorption and desorption chamber changes from a high-temperature and normal-pressure state to a high-temperature and negative-pressure state. The temperature transmitter maintains above 90 °C, and the second pressure transmitter shows -2000 Pa. At this time, the organic gas in the adsorption material is likely to volatilize under this working condition, so that the adsorption material is desorbed more fully;

[0023] When the pressure of the second pressure transmitter is stably maintained at the set value (-2000 Pa) for a certain period of time, the vortex gas pump is stopped. At this time, the decompressed nitrogen is introduced into the adsorption chamber, and the nitrogen distributor is used to disperse the nitrogen. At this time, the clean nitrogen will push out the residual steam condensate and organic gas in the adsorption and desorption chamber and send them to the condenser. After about 20 minutes, when the nitrogen evenly passes through the adsorption material, the condensate on its surface and the gas in the adsorption and desorption chamber are all replaced by nitrogen. During this period, the first pressure transmitter is controlled to be kept below 20 KPa. Finally, the organic gas on the surface of the adsorption material will volatilize under this working condition.

[0024] In the present utility model, clean nitrogen is used to displace the gas and condensate remaining in the adsorption chamber after desorption. The nitrogen pressure and ventilation time can be adjusted accordingly according to different substances and the size of different adsorption chambers. The pressure and time described above are only exemplary descriptions. The vortex air pump of the present utility model presses and drains for negative pressure desorption, and the negative pressure and duration can be adjusted accordingly according to different substances. The pressure and temperature described above are only exemplary descriptions.

[0025] Although the embodiments and drawings of the present utility model are disclosed for illustrative purposes, those skilled in the art can understand that various substitutions, changes, and modifications are possible without departing from the spirit and scope of the present utility model and the appended claims. Therefore, the scope of the present utility model is not limited to the content disclosed in the embodiments and drawings.

Claims

1. An efficient desorption device for organic gas recovery, characterized in that: It includes an adsorption and desorption chamber, a nitrogen distributor, a first pressure transmitter, a condenser, a vortex air pump and a second pressure transmitter. An adsorption material is arranged in the adsorption and desorption chamber, and a nitrogen distributor is arranged above the adsorption material. One side of the top of the outer wall of the adsorption and desorption chamber is provided with a first pressure transmitter, and the first pressure transmitter is connected to the nitrogen distributor through a nitrogen inlet pipeline. One side of the bottom of the outer wall of the adsorption and desorption chamber is provided with a condenser, and a vortex air pump is also arranged between the condenser and the adsorption and desorption chamber. A second pressure transmitter is arranged at the top of the adsorption and desorption chamber.

2. The high-efficiency desorption device for organic gas recovery according to claim 1, wherein: A temperature transmitter is also arranged on one side of the outer wall of the adsorption and desorption chamber.

3. The high-efficiency desorption device for organic gas recovery according to claim 2, wherein: A nitrogen pressure reducing valve is also arranged on the nitrogen inlet pipeline, and the outlet end of the nitrogen pressure reducing valve is connected to the inlet end of the first pressure transmitter.

4. The high-efficiency desorption device for organic gas recovery according to claim 3, characterized in that: A safety valve is also arranged at the top of the adsorption and desorption chamber.

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