CN101293167A - A large air volume integral continuous operation adsorption device - Google Patents

Abstract

The invention relates to an overall continuous operation adsorption device with large air volume, which can be mainly used for the recovery and purification of organic gases such as benzene, aldehydes and ketones, and the treatment of gaseous pollutants such as malodorous gas and hydrogen sulfide. The adsorption device includes an outer shell, a bag-type activated carbon fiber adsorption bed, an automatic controller of the adsorption system, an inlet pipe valve assembly, an air outlet pipe valve assembly, a regenerated air inlet pipe valve assembly and a regenerated air outlet pipe valve assembly. The inside of the outer casing is separated by a sealed partition to form several adsorption chambers. The bag-type activated carbon fiber adsorption bed is an adsorption bag made of activated carbon fiber material, and multiple adsorption bags are built in one adsorption chamber. The regeneration method of the adsorbent is alternate regeneration in different chambers. In the present invention, all the adsorption chambers are placed in one outer shell, and the adsorption operation is carried out as a whole, while each adsorption chamber inside the outer shell is rotated according to the set time for regeneration operation. Therefore, from the perspective of the entire device operation process, the device Adsorption regeneration operation has better integrity and continuity.

Description

A large air volume integral continuous operation adsorption device

technical field

The invention relates to an overall continuous operation adsorption device with large air volume, which can be mainly used for the recovery and purification of organic gases such as benzene, aldehydes and ketones, alcohols, hydrocarbons, and gaseous pollutants such as malodorous gases, sulfur dioxide, nitrogen oxides, and hydrogen sulfide. governance.

technical background

Adsorption method is widely used in the recovery and purification of gaseous pollutants in organic chemical, petrochemical and other production sectors. Industrially mature adsorption methods are divided into three categories, namely fixed bed, moving bed and fluidized bed.

The adsorbent in the fixed bed is fixed in a certain position, and the adsorption operation is carried out under the condition of standing still. The fixed bed is simple in structure, easy to manufacture, and low in price. It is suitable for small, dispersed, and intermittent pollution source control. Adsorption and desorption are performed alternately and intermittently. It is currently the most widely used adsorption device. Its disadvantages are: (1) In order to adapt to continuous operation, the fixed bed usually adopts a double adsorption bed or three adsorption bed system, which increases the total amount of adsorbent; (2) The thermal conductivity of the adsorbent layer is poor, and the adsorption heat generated during adsorption is not easy to export. Local overheating of the bed is easy to occur during operation; (3) For a thick bed, the pressure loss is relatively large and the energy consumption is relatively high.

The solid adsorbent and gas in the moving bed flow through the adsorber at a constant speed, so that the gas-solid two-phase contact is good, channeling and local inhomogeneity will not occur, and the shortcomings of local overheating of the fixed bed are overcome. Since its operation is continuous, the same amount of adsorbent can handle more gas. The moving bed is suitable for stable, continuous and large-volume gas purification. The disadvantages are: large power and heat consumption, serious wear of the adsorbent, complex structure of the moving bed, huge equipment, high equipment investment and operating costs.

In the fluidized bed, the solid adsorbent is in a fluidized state due to the high gas velocity, and the gas and solid contact are quite sufficient. The gas velocity is more than three or four times that of the fixed bed, which is suitable for the treatment of continuous and large-scale pollution sources. The disadvantage is that due to the serious wear of the adsorbent and the container, the exhaust gas of the fluidized bed adsorber often contains adsorbent powder, so dust removal equipment must be installed at the rear of the adsorber, and the energy consumption of the fluidized bed is higher, which is harmful to the adsorption process. The mechanical strength requirements of the agent are also higher.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned defects of the existing adsorption bed, and provide a large air volume integral continuous operation adsorption device, the adsorption device is simple in structure, easy to operate, low in manufacturing and operating costs, and can be applied to continuous, large-volume Treatment of pollution sources.

In order to achieve the above object, the present invention adopts the following technical solutions. The adsorption device includes an outer shell, a bag-type activated carbon fiber adsorption bed, an automatic controller for the adsorption system, an intake pipe valve assembly, an air outlet pipe valve assembly, a regenerated air intake pipe valve assembly, and a regenerated air outlet pipe valve assembly; Separated by plates, several adsorption chambers are formed; each adsorption chamber is fixed with a bag-type activated carbon fiber adsorption bed; The air intake main pipe connected to the air intake pipes of each adsorption chamber; the air outlet pipe valve assembly includes an air outlet pipe arranged in each adsorption chamber, an air outlet valve arranged on the air outlet pipe and an air outlet main pipe connected to the air outlet pipes of each adsorption chamber; the regeneration inlet The air pipe valve assembly includes regeneration gas inlet pipes arranged in each adsorption chamber, regeneration gas inlet valves arranged on the regeneration gas inlet pipes, superheated steam inlet main pipes and hot air inlet pipes connected with the regeneration gas inlet pipes of each adsorption chamber The main pipe, the regeneration gas inlet pipe of each adsorption chamber is connected with the superheated steam inlet main pipe and the hot air inlet main pipe through a three-way switching valve; the regeneration gas outlet pipe valve assembly includes a regeneration gas outlet pipe arranged in each adsorption chamber, a set The regeneration gas outlet valve on the regeneration gas outlet pipe and the outlet main pipe connecting the regeneration gas outlet pipes of each adsorption chamber. All the above valves are connected with the automatic controller of the adsorption system, and the automatic controller of the adsorption system controls the opening and closing of each valve.

The bag-type activated carbon fiber adsorption bed includes several adsorption bags processed by activated carbon fiber materials and a support frame. The support frame is composed of an inner frame and an outer frame, and the inner and outer frames sandwich the adsorption bags.

In the present invention, activated carbon fiber is processed into a bag shape, and multiple adsorption bags are built in one adsorption chamber. This method can make full use of the inner space of each adsorption chamber, increase the adsorption cross-sectional area of the bed, and thus can handle larger air volumes. The gas to be treated enters from the lower box of the adsorption chamber, enters the middle box after being buffered by the lower box, enters the bag from the outside of each activated carbon fiber adsorption bag by means of external filtration, flows through the outlet of the flower plate into the upper box, and finally passes through the Each chamber outlet pipe exits the adsorption chamber.

When using this adsorption device, each adsorption chamber is regenerated in turn, that is, if a set of adsorption device contains N adsorption chambers, N-1 adsorption chambers are in the adsorption working condition, and the remaining one is in the regeneration working condition. After the regeneration of the adsorption chamber in the regeneration working condition is completed, it will be put into use, and at the same time, the other adsorption chamber will enter the regeneration working condition by switching the valve. Different from the double adsorption bed adsorption system or the three adsorption bed adsorption system in the traditional fixed bed adsorption method, the present invention puts all the adsorption chambers in one shell and performs the adsorption operation as a whole, and each adsorption chamber inside the shell The chambers are rotated according to the set time for regeneration operation, so from the perspective of the entire device operation process, the adsorption regeneration operation of the device has better integrity and continuity.

The present invention is applicable to various usage places, especially in places where the air volume to be treated is relatively large and the space is limited, and the effect is more remarkable.

Description of drawings

Fig. 1 is the schematic diagram of the basic structure of the adsorption chamber of the present invention

Figure 2 is a schematic diagram of the basic structure of the adsorption device of the present invention

Fig. 3 is a schematic diagram of the overall continuous operation adsorption method of the present invention.

In the figure: 1. Upper box body, 2. Middle box body, 3. Lower box body, 4. Air intake pipe, 5. Air outlet pipe, 6. Support frame, 7. Bag-type activated carbon fiber adsorption bed, 8. Regenerated air intake pipe Branch pipe, 9. Regeneration gas inlet pipe, 10. Fuel hole, 11. Regeneration outlet pipe, 12. Air intake main pipe, 13. Air outlet main pipe, 14. Superheated steam intake main pipe, 15. Hot air intake main pipe, 16. Regeneration Gas outlet main pipe, 17. Air inlet pipe valve assembly, 18. Air outlet pipe valve assembly, 19. Regeneration air inlet pipe valve assembly, 20. Regeneration outlet pipe valve assembly, 21. Outer shell, 22. The adsorption system automatic controller, 23. Main pipe Inlet valve, 24, inlet valve of adsorption chamber, 25, outlet valve of main pipe, 26, outlet valve of adsorption chamber, 27, inlet valve of superheated steam main pipe, 28, inlet valve of hot air main pipe, 29, inlet valve of regenerative gas , 30, three-way switching valve, 31, regeneration gas manifold outlet valve, 32, regeneration gas outlet valve.

Detailed ways

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

As shown in Figure 2, the adsorption device includes an outer shell 21, a bag-type activated carbon fiber adsorption bed 7, an inlet pipe valve assembly 17, an outlet pipe valve assembly 18, a regeneration inlet pipe valve assembly 19, a regeneration outlet pipe valve assembly 20 and an adsorption system Automatic control instrument 22. The inside of the outer casing 21 is separated by a sealed partition to form several adsorption chambers. The structure of the adsorption chamber is shown in FIG. 1 , which includes an upper box 1 , a middle box 2 and a lower box 3 that communicate with each other. The bag-type activated carbon fiber adsorption bed 7 is fixed in the middle box 2, and the upper box 1 has a built-in regenerative air inlet pipe 9 and is connected to the air outlet pipe 5. The trachea branch pipe 8 and the regenerative air intake pipe branch pipe 8 are distributed with some downwardly opening air injection holes 10, the air injection holes correspond to the bag-type activated carbon fiber adsorption bed 7 below, and the gas outlet pipe 5 is communicated with the top of the upper casing.

The middle box has a built-in bag-type activated carbon fiber adsorption bed 7. The bag-type activated carbon fiber adsorption bed is an adsorption bag made of activated carbon fiber material. The adsorption bag is fixed in the middle box by a support frame 6. It is composed of two parts, the outer frame, and the inner and outer frames clamp the adsorption bag in the middle, which increases the strength of the adsorption bag and prevents it from being deformed by the impact force of the airflow during work or regeneration.

The lower box body mainly plays the role of air intake buffer, and its upper end communicates with the middle box body, and its side lower part or bottom communicates with the air intake pipe 4 and the regenerated air outlet pipe 11.

As shown in FIG. 2 , the intake pipe valve assembly 17 specifically includes an intake pipe 4 arranged in each adsorption chamber, an intake valve 24 , an intake manifold 12 connecting the intake ducts of each adsorption chamber, and a manifold intake valve 23 . The air inlet pipe 4 communicates with the adsorption chamber, and the air inlet pipe 4 can be arranged at the side lower part of the lower box body 3 or the bottom of the box body, and is used to feed the gas to be treated into the adsorption chamber.

Outlet pipe valve assembly 18 comprises the outlet pipe 5 that is arranged on each adsorption chamber, the outlet valve 26, the outlet main pipe 13 that connects each adsorption chamber outlet pipe and the main pipe outlet valve 25, and the outlet pipe 5 communicates with the upper casing for discharging the Treated gas.

The regenerative air inlet pipe valve assembly 19 specifically includes the regeneration gas inlet pipe 9 arranged in each adsorption chamber, the inlet valve 29 arranged on the regeneration gas inlet pipe 9, and the superheated steam inlet pipe 14 connected to the regeneration gas inlet pipe 9 of each adsorption chamber And hot air intake manifold 15. A superheated air main intake valve 27 is arranged on the superheated steam intake main pipe 14 , and a hot air main main intake valve 28 is arranged on the hot air intake main pipe 15 . The regeneration gas intake pipe 9 of each adsorption chamber communicates with the superheated steam intake main pipe 14 and the hot air intake main pipe 15 through the three-way switching valve 30, and the superheated steam and hot air are controlled by the three-way switching valve 30 to work alternately.

The regeneration gas outlet pipe valve assembly 20 specifically includes the regeneration gas outlet pipe 11 arranged in each adsorption chamber, the regeneration gas outlet valve 32 arranged on the regeneration gas outlet pipe 11, the regeneration gas outlet main pipe 16 connecting the regeneration gas outlet pipes of each adsorption chamber and A main pipe outlet valve 31 arranged on the regeneration gas outlet main pipe 16 .

The valves are all controlled by solenoid valves, and the terminals of the solenoid valves are connected to the automatic controller 22 of the adsorption system. The adsorption system automatic controller 22 is used to control the opening and closing of each valve, so as to automatically realize the conversion between the working and regeneration working conditions of each adsorption chamber, and ensure the continuity of the adsorption process of the device.

During the adsorption operation of the device, the gas to be treated enters from the lower box of the adsorption chamber, enters the middle box after being buffered by the lower box, and enters the bag from the outside of each activated carbon fiber adsorption bag through external filtration, and enters through the mouth of the bag. The upper box is finally discharged from the adsorption chamber through the outlet pipe of each chamber. In this embodiment, the activated carbon fiber is processed into a bag shape, and multiple adsorption bags are built in one adsorption chamber, which can make full use of the internal space of each adsorption chamber and increase the adsorption cross-sectional area of the bed, so it is comparable to the traditional fixed bed adsorption with similar volume. Compared with the device, this method can handle a larger air volume.

As shown in Figure 3, the difference between the present invention and the double-adsorption-bed adsorption system or three-adsorption-bed adsorption system in the traditional fixed-bed adsorption method is that the present invention puts all the adsorption chambers in one shell, and performs the adsorption operation as a whole. Due to the need for alternate operation of adsorption and regeneration, the adsorption process of a single adsorption chamber is intermittent, but from the perspective of the adsorption device as a whole, the adsorption process is continuous. Taking Fig. 3 as an example to illustrate the operation method of the present invention, the adsorption device in this embodiment includes four adsorption chambers, namely adsorption chamber A, adsorption chamber B, adsorption chamber C and adsorption chamber D. After the device is started, the four adsorption chambers enter the adsorption working condition at the same time. At this time, the inlet valve 23 of the main pipe, the inlet valve 24 of the adsorption chamber, the outlet valve 25 of the main pipe and the outlet valve 26 of the adsorption chamber are all open, and the inlet valve 27 of the superheated steam main pipe , hot air main pipe inlet valve 28, regeneration gas inlet valve 29, regeneration gas main pipe outlet valve 31 and regeneration gas outlet valve 32 are all closed. When the adsorption bed in a certain adsorption chamber (assuming adsorption chamber D) is saturated, the adsorption system automatic controller 22 controls to close the adsorption chamber inlet valve 24 and the adsorption chamber outlet valve 26 corresponding to the adsorption chamber D, and open the superheated steam main pipe The intake valve 27 , the hot air manifold intake valve 28 and the regeneration gas manifold outlet valve 31 , and their corresponding regeneration gas inlet valve 29 and regeneration gas outlet valve 32 . At this time, the working state of the whole set of devices is shown in Figure 3. The adsorption chamber A, adsorption chamber B and adsorption chamber C are in the adsorption working condition, and the exhaust gas enters the adsorption chamber A, adsorption chamber B and The adsorption chamber C is adsorbed by the bag-type activated carbon fiber adsorption bed, and the clean gas is discharged from the outlet pipes of each adsorption chamber and collected in the main outlet pipe, and then connected to the external exhaust device. While the first three adsorption chambers are performing adsorption operations, the adsorption chamber D is in the regeneration condition, as shown by the air flow arrow in Figure 3, firstly control the three-way switching valve to open the superheated steam pipe, close the hot air pipe, and the superheated steam is discharged from the main pipe Enter the regenerative inlet pipe of the adsorption chamber D, and then spray out from the jet hole on the branch pipe of the regenerative inlet pipe to regenerate the saturated adsorption bed in the adsorption chamber. Switch the valve, close the superheated steam pipe, and open the hot air pipe to make the hot air take away the residual moisture in the adsorption bed. The regeneration gas enters the regeneration gas outlet main pipe through the outlet pipe, and then enters the condensing equipment to condense, and finally treats the waste liquid. After the regeneration of the adsorption chamber D is completed, the corresponding regeneration gas inlet valve and the regeneration gas outlet valve are closed, and the corresponding adsorption chamber inlet valve and the adsorption chamber outlet valve are opened to make it enter the adsorption working condition. Thereafter, when another adsorption chamber (such as adsorption chamber A) reaches saturation, close the adsorption chamber inlet valve and adsorption chamber outlet valve corresponding to adsorption chamber A, and open its corresponding regeneration gas inlet valve and regeneration gas outlet valve, At this time, the working state of the whole device is that the adsorption chamber B, the adsorption chamber C and the adsorption chamber D are in the adsorption working condition, and the adsorption chamber A is in the regeneration working condition. After the adsorption chamber A is regenerated, close the corresponding regeneration gas inlet valve and regeneration gas outlet valve, and open the corresponding adsorption chamber inlet valve and adsorption chamber outlet valve to enter the adsorption working condition. By analogy, there are always three adsorption chambers in the adsorption state and one adsorption chamber in the regeneration state during the entire operation of the device.

If a set of adsorption device includes N adsorption chambers, the device can always keep N-1 adsorption chambers in adsorption working condition, and one adsorption chamber in regeneration working condition, which ensures the continuity of the adsorption operation of the present invention.

Claims (2)

1, a kind of large-air capacity integral continuous operation adsorbing device is characterized in that: comprise shell body (21), pocket type activated carbon fiber adsorbent bed (7), adsorption system auto-controller (22), air inlet pipe valve module (17), escape pipe valve module (18), regeneration air inlet pipe valve module (19) and regeneration escape pipe valve module (20); Described shell body (21) is inner to be separated by seal diaphragm, constitutes several adsorption chambers; All be fixed with pocket type activated carbon fiber adsorbent bed (7) in each adsorption chamber; Described air inlet pipe valve module (17) comprises the air inlet pipe (4) that is arranged at each adsorption chamber, is arranged on intake valve (24) and the inlet manifold (12) who is connected each adsorption chamber air inlet pipe (4) on the air inlet pipe (4); Described escape pipe valve module (18) comprises the escape pipe (5) that is arranged at each adsorption chamber, is arranged on air outlet valve (26) and the house steward that gives vent to anger (13) who is connected each adsorption chamber escape pipe (5) on the escape pipe (5); Described regeneration air inlet pipe valve module (19) comprises the regeneration gas air inlet pipe (9) that is arranged at each adsorption chamber, superheated steam inlet manifold (14) and the HAI Heated Air Intake house steward (15) who is arranged on the regeneration gas intake valve (29) on the regeneration gas air inlet pipe (9) and is connected with each adsorption chamber regeneration gas air inlet pipe (9) by three-way switch valve (30); Described regeneration escape pipe valve module (20) comprises the regeneration gas escape pipe (11) that is arranged at each adsorption chamber, is arranged on regeneration gas air outlet valve (32) and the house steward that gives vent to anger who is connected each adsorption chamber regeneration gas escape pipe on the regeneration gas escape pipe, and above-mentioned each valve all links to each other with adsorption system auto-controller (22).

2, a kind of large-air capacity integral continuous operation adsorbing device according to claim 1, it is characterized in that: described pocket type activated carbon fiber adsorbent bed (7) comprises some the absorbent packet and the support frames (6) that are processed into by active-carbon fibre material, described support frame (6) is made up of inner frame and outside framework two parts, and internal and external frame is clipped in the middle absorbent packet.

Images