JPH0568840A - Enriching method and device - Google Patents

Abstract

PURPOSE:To highly efficiently adsorb the pneumatically conveyed harmful/ malodorous gas by countercurrent contact with an adsorbent using a single- system separation means and a regenerator and to desorb the adsorbate at high concentration utilizing a low-flow-rate regenerating gas. CONSTITUTION:This device is provided with a means 8 for mixing a powdery adsorbent into a gas contg. sticky dust and a harmful/malodorous gas at the two positions on the upstream and downstream sides and pneumatically conveying the mixture, a means 11 for separating the adsorbent from the gas to be treated delivered from the means 8 and a regenerator 12 for mixing the heated adsorbent separated by the means 11 with a low-flow-rate regenerating gas, desorbing the adsorbate and supplying the regenerated adsorbent on the upstream and downstream sides of the means 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to removal of sticky dust and separation of harmful / malodorous gas components during deodorization of a low-concentration gas to be treated containing sticky dust and harmful / malodorous gas components. The present invention relates to a method for concentrating a harmful / odorous gas component for concentrating and efficiently processing, and a concentrating device suitable for carrying out the method.

[0002]

2. Description of the Related Art So-called deodorizers for separating harmful / malodorous gas components from exhaust gas containing harmful / malodorous gas components such as low-concentration organic solvents are widely used in manufacturing processes of various industries. A typical prior art of this type of deodorizing device is shown in FIG. 11 as an automobile paint exhaust gas treatment device.

In the coating line 1 for automobile bodies, exhaust gas containing sticky dust consisting of fine paint residues having a particle size of 10 μm or less and harmful / malodorous gas components of organic solvents is generated, and is purified. This exhaust gas is first passed through the wet electrostatic precipitator 2 to remove dust, and in order to prevent dust from adhering to the electrode, water may be sprayed on the dust collecting electrode. Be seen. The dust-removed exhaust gas, that is, the gas to be treated is sent to the humidity controller 3 to be dehumidified and temperature-controlled, and then the honeycomb-type concentrator 4 concentrates and separates harmful / odorous gas components and cleans them. The treated air thus obtained is retransmitted to the coating line side through the humidity controller 5, and the harmful / odorous gas components concentrated by the concentrating device 4 are separated, and then oxidized by the catalytic oxidation device 6 to be rendered harmless. Exhaust gas is discharged to the outside of the room through the heat recovery heat exchanger 7.

[0004]

As a device for directly treating exhaust gas, there are a direct combustion furnace, a catalytic oxidation device, an adsorption type recovery device, a chemical solution cleaning, etc. Due to the problem of reduced economic efficiency, it has been in the limelight as a device for concentrating and once reducing the amount of air and combining it with a small treatment device. It is the above-mentioned concentrating device 4 using. Although this device has the advantage of being excellent in operating economy, it has the following problems.

Since the adsorbent is processed into a honeycomb rotor, the apparatus cost is more than ten times higher than that of the raw adsorbent, and the adsorbent is mixed with the organic binder and auxiliary materials for molding. However, when the adsorption performance is deteriorated, it is difficult to regenerate by activation, and further, since the heating method is by hot air for regeneration, indirect heating cannot be performed and the enrichment is limited to 10 to 15 times in terms of the heating amount of the honeycomb rotor. Therefore, not only the adsorbent but also other combination members such as auxiliary materials must be heated at the same time, which requires a large amount of heating.

In particular, in the case of treating automobile exhaust gas,
Since the adhesive dust is contained in the exhaust gas, the adhesive dust adheres to the surface of the honeycomb rotor and clogs it, resulting in extremely low adsorption performance. The problem is that it is necessary to combine with the container 2 and the total equipment cost is high.

An object of the present invention is to remove sticky dust during air flow and at the same time perform adsorption of harmful / malodorous gas components under a high performance by a two-point supply system of an adsorbent.
By adopting a configuration that enables simple and reliable desorption using a small flow rate of regeneration gas, it is possible to provide a concentrating method and device with a compact structure that can perform highly concentrated and highly efficient exhaust gas treatment at low cost. Is to provide.

[0008]

According to the present invention, a powdery adsorbent is mixed with a gas to be treated containing sticky dust and harmful / odorous gas components at two locations, an upstream side and a downstream side. While adhering and separating sticky dust while adsorbing harmful / odorous gas components, then separating into purified gas and powdery adsorbent, and flowing a small amount of regeneration gas The adsorbent separated in step 1 is heated to desorb and regenerate the harmful / odorous gas component, and the regenerated adsorbent is mixed with the gas to be treated again at the upstream side and the downstream side to adhere and It is a method of concentrating harmful / malodorous gas characterized by adsorbing.

Further, the present invention mixes a powdery adsorbent with a gas to be treated containing sticky dust and harmful / odorous gas components at two locations, an upstream side and a downstream side, and conveys the adhesive dust while carrying an air stream. Of the adsorbed harmful and malodorous gas components, and then separated into the purified gas and the powdery adsorbent, and a part of the separated adsorbent is re-covered on the upstream side. It is mixed with the processing gas to cause adhesion and adsorption, and the remaining amount of the separated adsorbent is heated with a small flow rate of regeneration gas flowing to desorb and regenerate harmful and malodorous gas components and regenerate. The adsorbent afterwards is mixed again with the gas to be treated at the downstream side to cause adhesion and adsorption.
It is a method of concentrating offensive odor gas.

Further, according to the present invention, a powdery adsorbent is added to a gas to be treated containing sticky dust and harmful / odorous gas components at two locations, an upstream side near the inflow end and a downstream side near the outflow end. And a separation means for separating the adsorbent from the gas to be treated containing the adsorbent from the airflow conveyance means, and a regeneration gas supplied at a small flow rate and separated by the separation means. The adsorbent is mixed and heated to desorb the adsorbent, and the adsorbent after desorption is divided into two parts, that is, the upstream side and the downstream side of the air flow conveying means, and the regenerator is supplied.
It is a concentrating device characterized by obtaining concentrated harmful / odorous gas components from a regenerator.

Further, according to the present invention, a powdery adsorbent is added to a gas to be treated containing sticky dust and harmful / odorous gas components at two locations, an upstream side near the inflow end and a downstream side near the outflow end. An air flow carrying means for mixing and carrying the air flow, and separating the adsorbent from the gas to be treated containing the adsorbent from the air flow carrying means and feeding it out by a predetermined amount, and a part of the adsorbent on the upstream side of the air flow carrying means. The separation means to be supplied and the regeneration gas are supplied at a small flow rate, and the adsorbent separated and fed out by the separation means is mixed and heated to desorb the adsorbent, and the adsorbent after desorption is provided on the downstream side of the air flow conveying means. A concentrating device comprising a regenerator for supplying and obtaining a concentrated harmful / malodorous gas component from the regenerator.

[0012]

According to the present invention, the gas to be treated and the powdery adsorbent are mixed in the course of the air flow to perform highly concentrated adsorption and adhesion of sticky dust in a direct contact relationship. Therefore, the adsorption process is performed with a simple structure of the air flow transfer path, and a device having a complicated mechanism such as a honeycomb type concentrating device can be omitted.

During adsorption and desorption of adsorbed adsorbent, since the adsorbent is in the form of powder, only the adsorbent can be efficiently subjected to high-temperature indirect heat treatment during the mixing process, and therefore, regeneration is performed. It is possible to perform desorption with a small amount of regenerating gas required for regeneration without the need for heating with only the use air, and as a result, the exhaust gas after the desorption process is in a highly concentrated state. Exhaust gas treatment can be easily performed by a small-scale combustion or recovery device.

Further, according to the present invention, the adsorption operation in the air flow conveying process can be performed by using a single separating means and a regenerator.
It can be performed in a contact relationship by supplying from a location, and the purified gas performance can be further improved by contacting an adsorbent having a high degree of regeneration at the final stage.

In this case, as shown in FIG. 3, the relationship between the concentration of the harmful / odorous gas component and the amount of adsorption is, the higher the concentration is A _H than A _{L, the} more the adsorption capacity of the adsorbent is P P than P _{L. Since} it has a large property such as _H , the adsorption performance of the entire device is further improved by bringing the adsorbent, which has a smaller adsorption amount and an excellent adsorption ability, into contact with the lower concentration of the gas to be treated. It is self-evident that the degree of enrichment can be increased.

[0016]

1 is a systematic diagram of a first embodiment of the present invention. The apparatus shown in FIG. 1 is realized by an air flow carrying means 8 realized by a pipe line 10 in which a blower 9 is interposed, a single separating means 11 realized by a bag filter, and a ribbon agitator. And a direct combustion deodorizing device 13.

At the inflow end of the pipe 10 in the air flow conveying means 8, an exhaust gas pipe 14 for feeding a gas to be treated containing sticky dust and harmful / odorous gas components, for example, a coating exhaust gas of an automobile coating line, and a rotary. Adsorbent supply pipes 15 for supplying the regenerated adsorbent sent out from the regenerator 12 are connected with valves 26 provided midway, and the outflow end of the pipe 10 is at the middle of the lower chamber 17 of the bag filter 11. Connected to the department. The coating exhaust gas flowing through the exhaust gas pipeline 14 and the regenerated powdery adsorbent flowing through the adsorbent supply pipeline 15 are mixed on the upstream side near the inflow end of the pipeline 10,
After passing through the blower 9 and flowing in the pipe 10 and reaching the bag filter 11 from the outflow end, the powdery adsorbent having a temperature higher than room temperature is quickly cooled to room temperature because its heat capacity is small. Therefore, the harmful / odorous gas component in the coating exhaust gas is efficiently adsorbed by the powdery adsorbent while passing through the pipe 10. Further, the sticky dust in the coating exhaust gas adheres to and separates from the powdery adsorbent.

The coating exhaust gas flowing in the pipe 10 is adsorbed and adhered, and when it is sent to the lower chamber 17, the adhesive dust and harmful / malodorous gas components are removed and cleaned.

A transport pipe 54 is branched and connected to the adsorbent supply pipe 15 downstream of the rotary valve 26, and its pipe end is connected to the downstream side near the outflow end of the pipe 10. It

The transport line 54 is connected to the rotary valve 26.
A part of the regenerated adsorbent, which is sent out in a fixed amount through the above, is supplied to the downstream side.

A part of the regenerated adsorbent desorbed by the regenerator 12 is supplied to the downstream side of the air flow conveying means 8 via the transportation pipeline 54, and the remaining amount is supplied to the upstream side of the air flow conveying means 8. ..

Therefore, there is a two-stage countercurrent adsorption method in which the coating exhaust gas is cleaned with the regenerated adsorbent and then the adsorbent immediately after the regeneration is used to adsorb the target gas having a low malodorous gas component concentration. , And is realized by a single air flow carrier 8 and a regenerator 12.

The bag filter 11 is divided into two chambers, an upper chamber 16 and a lower chamber 17, by a filter 18 composed of a plurality of bag-shaped filter cloths, and a pipe line 19 is provided on the top wall of the upper chamber 16. Is connected, and this pipe line 19 extends, for example, to the side of the automobile coating line, while the lower chamber 17
A pipe line 21 provided with the rotary valve 20 is connected to the bottom of the pipe 21. The tip end of the pipe line 21 is connected to the inlet side of the ribbon agitator 12.

The rotary valve 20 is a feeder having a rotor in which the tip of the blade is in close contact with the case and rotates about the horizontal axis, and the powder can be received between the blades by gravity and supplied while sealing. However, it is possible to replace the rotary feeder or the lock hopper having the same effect.

Of the mixed coating exhaust gas and the powdery adsorbent fed from the pipe line 10 into the lower chamber 17, the adsorbent to which the sticky dust adheres and the harmful / malodorous gas component is adsorbed is After being collected by the filter 18, the coating exhaust gas is blown off by applying a back pressure and falls to the bottom, while the cleaned coating exhaust gas passes through the filter 18 and the pipeline 19 to the automobile coating line side. Sent.

The powdery adsorbent that has dropped to the bottom is sent to the ribbon agitator 12 by the rotary valve 20 in a fixed amount. As described above, in the bag filter 11, the powdery adsorbent to which the adhesive dust adheres and the harmful / odorous gas component is adsorbed and the purified gas are continuously separated.

FIG. 2 shows a ribbon stirrer 1 shown in FIG.
2 is a schematic perspective view of FIG. The ribbon stirrer 12 includes a horizontal cylindrical tank 22 in which a jacket for circulating a heating heat medium is formed on a peripheral wall portion, a spiral ribbon 23 accommodated in the cylindrical tank 22, and a cylindrical tank 10. And a horizontal rotary shaft 24 which is provided along the center of the inner cylinder and is rotationally driven by a motor not shown. The tip of the conduit 21 is connected to the upper part of one end side (for example, the right end in FIGS. 1 and 2) of the cylindrical tank 22, and this one end side is the inlet side. Cylindrical tank 22
On the side wall on the other end side (left end in FIGS. 1 and 2) of the adsorbent extraction hole 2
5 is provided, and the extraction hole 25 communicates with two points on the upstream side and the downstream side of the air flow conveying means 8 by the adsorbent supply pipe line 15 in which the rotary valve 26 is interposed. The other end side is the exit side. An air supply port 27 is provided in the vicinity of the connecting portion of the pipe line 21 on the inlet side of the cylindrical tank 22, and a small flow rate of normal temperature or heated air, nitrogen, carbon dioxide gas or the like as a regeneration gas is provided in the intake port 27. Gas is supplied.

In this ribbon agitator 12, the horizontal rotary shaft 2
When 4 rotates, the spiral ribbon 23 rotates around the rotation shaft 24 and moves along the inner wall of the cylindrical tank 22. By this ribbon agitating action, the powdery adsorbent fed from the pipe line 21 sequentially moves to the outlet side along the inner wall of the cylindrical tank 22, and during that time, a small amount of regeneration gas supplied from the intake port 27 and the regeneration gas are supplied. Contact and mix. At the same time, it is heated to 100 ° C to 200 ° C by the heating medium in the jacket. As a result, the adsorbent is heated and contacts the regeneration gas to be desorbed and regenerated. This regenerated adsorbent is
It is returned to the pipe line 10 of the air flow carrying means 8 through the adsorbent supply pipe line 15 and again performs the adsorption action.

The harmful / malodorous gas components separated by desorption are mixed and discharged from the exhaust port 28 provided on the outlet side of the cylindrical tank 22 with a small amount of the regeneration gas after the regeneration treatment, and are discharged through the exhaust pipe 29. It is sent to the direct-burning type deodorizing device 13 and is rendered harmless by the burning process.

A nonflammable adsorbent is suitable as the powdery adsorbent used in the embodiments described above, and there is no danger of dust explosion, which is particularly advantageous in terms of safety. As an example, the particle size is 300 μm or less, preferably 100 μm.
Hydrophobic zeolites containing the following as main components are listed. This hydrophobic zeolite is an excellent adsorbent for polar malodorous substances such as organic solvents and ammonia and mercaptan. It is a crystal of aluminosilicate metal salt chemically, and absorbs a lot of malodorous components as an adsorbent. It has characteristics.

FIG. 4 is a system diagram of the second embodiment of the present invention.

This device is similar to the first embodiment shown in FIG. 1, and the corresponding parts bear the same reference numerals.

In the apparatus of this example, it should be noted that the bag filter 11 as the separating means has two adsorbent extraction lines for extracting the adsorbent separated in the lower chamber 17.

One is formed by a conduit 21A having a rotary valve 20A interposed in the middle and is connected to the bottom wall portion as in the first embodiment, and the other is equipped with the rotary valve 20B in the middle. It is formed by a pipe line 21B that is provided in between, and is provided so as to be connected to the side wall portion.

A ribbon stirrer 12 is provided at the tip of the pipe 21A.
Is connected to the inlet side of the pipe line 21B, and the tip of the pipe line 21B is connected to the upstream side of the pipe line 10 in the air flow conveying means 8.

A part of the adsorbent which separates from the gas to be treated, which has been cleaned by the bag filter 11, and falls, is taken out through the pipe line 21B, is directly sent to the upstream side of the pipe line 10, and is The adsorbent passes through the pipe 21A and the ribbon agitator 12
Sent to the entrance of.

In the apparatus of this example, the adsorbent adsorbing the harmful / odorous gas component is taken out from the bag filter 11 as one separating means, and a part of the adsorbent is left on the upstream side of the air flow conveying means 8. It is sent in and brought into contact with the gas to be treated containing a large amount of harmful / odorous gas components to cause adsorption.
The remaining amount is passed through the ribbon stirrer 12 to be regenerated by desorption, and then the adsorbing action is carried out by bringing it into contact with a gas to be treated containing a small amount of harmful / malodorous gas components in a state where the adsorbing ability is large.

In this way, when the concentration of harmful / malodorous gas components is low, the adsorbent whose capacity has been made sufficient by regeneration is effectively adsorbed, and on the contrary, when the component concentration is high, the adsorption capacity immediately after separation is high. Adsorption can be carried out by the decreasing adsorbent, and a highly effective adsorption operation by the countercurrent contact method is carried out between the gas to be treated and the adsorbent.

FIG. 5 is an isothermal adsorption diagram for explaining the adsorption operation mode of the second embodiment. In FIG. 4, the gas to be treated (state F) in the exhaust gas pipeline 14 containing the harmful / odorous gas component in a high concentration A ₄ and the adsorption of a concentration A ₂ equivalent to the concentration A ₂ sent out from the lower chamber 17 in the bag filter 11. adsorption amount P ₂ have been made, the conduit in the adsorbent has sufficient adsorption reserve capacity and (condition E) is pneumatic conveying means 8 for high concentration gas component a ₄ equivalent adsorption amount P ₄ Since the gas is brought into contact with the upstream side portion of 10 and adsorption is further performed, the component concentration of the gas to be treated decreases to A ₃ , and the adsorbent enters the state H.

The gas to be treated having the concentration A ₃ and the adsorbent (state G) which has the maximum adsorption capacity with the adsorption amount P ₁ corresponding to the low concentration A ₁ remaining after being desorbed by the ribbon agitator 12 are bags. Immediately before flowing into the filter 11, they come into contact with each other in the pipe line 10 to be adsorbed by the adsorbent, and the adsorbent adsorbs up to the adsorption amount P ₂ equivalent to the concentration A ₂ to be in the state E and inside the bag filter 11. Is sent to the lower chamber 17 of the. As described above, the gas having a high concentration of the component A ₄ has a low efficiency A
Efficient adsorption can be performed until the state E of ₂ is reached, and highly concentrated treatment can be performed by the ribbon agitator 12, while an adsorbent having a larger amount than the processing capacity of the ribbon agitator 12 is introduced into the airflow conveying means 8. It can be transported to perform adsorption under high capacity.

FIG. 6 is a system diagram of the third embodiment of the present invention. This device is similar to the first embodiment, and corresponding parts are designated by the same reference numerals. It should be noted in this third embodiment that the separation means is realized by the cyclone 31, and the regenerator is realized by a device in which the transportation pipeline 34, the hot air generating means 35 and the cyclone 38 are combined.

In the cyclone 31, an exhaust inner cylinder 32 is concentrically provided at the center of a cylindrical main body 31A, and the outflow end of the pipe line 10 of the air flow transfer means 8 is connected to the upper portion of the cylindrical wall of the main body 31A. To be done. The air flow flowing in the pipe line 10, that is, the flow of the gas to be treated in which the powdery adsorbent is mixed, flows into the main body 31A in the tangential direction of the cylindrical wall and descends while swirling along the inner wall of the cylinder. During this time, a centrifugal force acts on the powdery adsorbent, the adsorbent moves toward the wall, is separated from the purified gas as an air stream, and drops down along the wall. On the other hand, the cleaning gas separated from the adsorbent flows from the lower end into the exhaust inner cylinder 32 and flows from the upper end to the main body 31A.
Is released to.

The adsorbent that falls downwardly and accumulates is the main body 31.
The rotary valve 33 provided at the bottom portion of A supplies the fixed amount by a fixed amount, and supplies it to the inflow side of the transportation pipeline 34, which is the connection side of the hot air generating means 35.

The transport pipe 34 has its inflow side end connected to the hot air generating means 35, and its outflow side end connected to the upper portion of the cylindrical wall of the main body of the cyclone 38. Cyclone 38 is Cyclone 3
The basic structure is the same except that the capacity is different from that of No. 1, and the adsorbent separates the contained airflow into an adsorbent and an airflow by the action of centrifugal force in the main body, and the adsorbent is moved from the bottom to the rotary valve 37. It is formed so that it can be delivered while sealing a fixed amount.

The powdery adsorbent separated by the cyclone 31 is supplied into the transportation pipeline 34 through the rotary valve 33. In the transportation pipeline 34, the adsorbent in which the harmful / odorous gas component is adsorbed and the hot air generated by the hot air generating means 35 flow while being mixed, and while the adsorbent is being gas-transported, The adsorbent floating in the hot air is desorbed,
Then, in the cyclone 38, the regenerated adsorbent and the desorbed gas are separated. The adsorbent, which has fallen and accumulated in the cyclone 38, passes through the rotary valve 37, a part of the adsorbent is sent to the downstream side of the pipeline 10 of the air flow conveying means, and the remaining amount is upstream of the pipeline 10. Sent to the side. On the other hand, the highly concentrated harmful / malodorous gas component after being separated is sent to the catalytic oxidizer 30 and is transferred to the heat exchanger 132.
The catalyst layer 131 is heated by exhaust heat and then detoxified by the oxidation treatment in the catalyst layer 131, and then discharged to the atmosphere through the heat exchanger 132.

The third embodiment is the first embodiment in that the adsorbent regenerated by the regenerator is mixed with the gas to be treated and adhered and adsorbed again at two points on the upstream side and the downstream side of the air flow conveying means. The basic configuration is the same as the example.

FIG. 7 is a system diagram of the fourth embodiment of the present invention. This device is similar to the device shown in FIG. 6 and corresponding parts bear the same reference numerals. In the apparatus shown in FIG. 7, it should be noted that the powdery adsorbent in which the harmful / malodorous gas components separated by the cyclone 31 as the separating means are adsorbed is partially transferred through the rotary valve 33 to the pipeline. 36
The residual amount of the regenerated adsorbent formed by the cyclone 38, which is the final stage member of the regenerator 12, is formed so as to be fed to the upstream side of the pipe line 10 of the air flow conveying means 8 via the rotary valve 37. The passage 54 is formed so as to be fed to the downstream side of the pipeline 10 of the air flow conveying means 8.

In the fourth embodiment, a part of the adsorbent separated by the separating means is mixed again with the gas to be treated on the upstream side of the air flow conveying means to cause adhesion and adsorption, and the remaining amount separated is The basic structure for desorbing and regenerating, mixing again with the gas to be treated and adhering and adsorbing it on the downstream side of the air flow conveying means is the same as in the second embodiment.

FIG. 8 is a system diagram of a fifth embodiment of the present invention, FIG.
FIG. 9 is an enlarged cross-sectional view of the regenerator in FIG. The basic structure of this device is the same as that of the first and third embodiments, and the similar and corresponding parts are designated by the same reference numerals as those in FIGS. 1 and 6. It should be noted that in the apparatus shown in FIG. 8, the regenerator 39 is formed by a regenerator utilizing a moving bed. The regenerator 39 has a cylindrical container 4 extending vertically.
2, a heat exchanger 43 provided near the upper part of the container 42, and a countercurrent contact cylinder 44 also provided below the heat exchanger 43 in the container 42.

The container 42 has an adsorbent charging port 45 opened at the top wall thereof, and the charging port 45 is connected to the outlet of the cyclone 38 via the rotary valve 37. Further, the container 42 has an adsorbent take-out port 46 opened at the bottom wall thereof, and the take-out port 46 is connected via a rotary valve 47 to two locations on the upstream side and the downstream side with respect to the air flow carrying means 8.

The heat exchanger 43 is provided with a plurality of vertically extending passages, through which the powdery adsorbent can be passed and lowered, and steam, hot air gas or high temperature oil is used as a heat medium in the vessel. Supplied.

The countercurrent contacting cylinder 44 is provided with a plurality of vertically extending cylinders 48 arranged side by side, and a partition floor 49 closes the outer surface of the cylinders 48 and the inner surface of the container 42. Structure. An intake port 50 is opened on the side wall of the container 42 above the partition floor 49, and regeneration gas is fed into the container 42 through the intake port 50. Also container 4
2, the exhaust gas pipe line 51 is connected to the upper side wall of the heat exchanger 43.

The powdery adsorbent charged into the container 42 through the charging port 45 is mixed in the air flow rising from below inside the container above the heat exchanger 43, and the adsorbent disperses and moves in a moving bed. Are formed in the upper part of the heat exchanger 42 and in the passages inside the container.

The adsorbent is heated in the moving bed and further heated while descending through the heat exchanger 42, so that the countercurrent contacting cylinder 4 is heated.
No. 4, which is adsorbed by the harmful / odorous gas component is desorbed by coming into contact with the regeneration gas flowing in the respective cylinders 48 descending and rising in the respective cylinders 48 in a countercurrent relationship. At the same time, the sticky dust is removed and regeneration is performed.
The regenerated adsorbent is sent out in a fixed amount by the rotary valve 47 while holding the seal, and the air flow transfer means 8 is provided.
The pipe 10 is distributed to the upstream side and the downstream side, mixed in the exhaust gas, and the adsorption operation is performed again.

The highly concentrated gas containing a large amount of harmful / odorous gas components separated by the desorption operation in the cylindrical body 44 passes through the heat exchanger 43, reaches the upper part of the inside of the device, and flows from the exhaust gas pipe line 51 to the cooler 40. Leading to.

The cooler 40 is formed as a heat exchanger having a cooling pipe through which cold water flows, and cools the high temperature / highly concentrated gas delivered from the container 42 to near room temperature. This cooler 40 is provided because it is necessary to cool the high temperature gas to near room temperature in order to efficiently perform the adsorption operation for the recovery in the adsorption type recovery device 41 in the subsequent stage.

The adsorption-type recovery apparatus 41 has two batch-type adsorption towers 52 in which an activated carbon layer is provided inside the vessel, and each inlet has a switching valve for switching the gas outlet of the cooler 40. It is provided so as to be alternately connectable to the side.

The highly concentrated gas containing a large amount of harmful / odorous gas components cooled to around room temperature by the cooler 40 is
It is sent into the adsorption tower 52 of the adsorption type recovery device 41, and the harmful / odorous gas component is adsorbed by the adsorbent 53 such as activated carbon to become a purified gas, which is released into the atmosphere.

Since the adsorbing operation in the air flow conveying process in the air flow conveying means 8 and the separation operation of the adsorbent and the gas to be treated in the cyclone 31 are the same as those in the third embodiment, the description thereof will be omitted.

FIG. 10 is a system diagram of a sixth embodiment of the present invention. Regarding the basic configuration of this device, the second and fourth
The same reference numerals as those in FIG. 8 are used for the same or similar parts as those of the respective embodiments. It should be noted in the apparatus shown in FIG. 10 that the adsorbent in the adsorbed state separated from the gas to be treated by the cyclone 38 is partially taken out before being sent to the regenerator 39, and the upstream side of the pipe line 10 of the air flow conveying means 8 is taken. That is, the regenerated adsorbent that has been sent to the regenerator 39 and desorbed by the regenerator 39 is sent to the downstream side of the pipeline 10 in front of the cyclone 38 inlet via the transport pipeline 54. In this case, the powdery adsorbent is mixed with the gas to be treated at two points on the upstream side and the downstream side, and the adsorption operation is performed by the air flow conveying means, as in the second and fourth embodiments. , Description is omitted.

[0061]

As described above, according to the present invention, a powdery adsorbent such as a hydrophobic zeolite is mixed with sticky dust and a gas to be treated containing a harmful / odorous gas component in the course of air flow conveyance, Adhesion and adsorption are performed, and the operation of separating the purified gas and the adsorbent is sequentially repeated in two or more stages, resulting in high adsorption efficiency and high cleaning. The obtained gas can be easily obtained, and a special large-sized pretreatment dustproof device such as a honeycomb type concentration device is not required, and the concentration system is simplified.

Further, according to the present invention, while the powdery adsorbent is used to cyclically perform the adsorption operation under air flow conveyance and the desorption operation under contact with a small amount of regeneration gas, Since the adsorbent and the gas to be treated are brought into contact with each other and adsorbed at two points on the upstream side and the downstream side in the air flow carrying process,
It is possible to enhance the purified gas performance by mixing an adsorbent having a large adsorption capacity on the downstream side, and the separation means may be a single-system device, so deodorization can be performed with a simple system.

Further, according to the present invention, although the adsorption operation is performed, an adsorbent having a sufficient reserve capacity for a high-concentration gas is mixed on the upstream side of the air flow conveying means, and the adsorbent having a high regeneration rate is downstream. By mixing them on the side, there is also an advantage that the amount of adsorbent that is circulated can be made larger than the processing capacity of the regenerator for regeneration, and the desorption treatment can be effectively performed.

According to the present invention, the step of separating the adsorbent, which has been adsorbed and adhered, and the purified gas into
Since the adsorbent is in the form of powder, it can be easily carried out by a general-purpose means utilizing centrifugal force and a fluid moving layer, and can be separated easily and surely.

Further, according to the present invention, since the indirect heating is carried out in the state where a small flow rate of the regeneration gas is supplied, the regeneration gas required for the regeneration of the adsorbent may have a small flow rate, and the heating temperature can be raised to raise the regeneration efficiency. And the harmful / odorous gas component obtained by desorption is maintained at a high concentration.

In the present invention, since the adhesive dust is adhered to and collected by the powdery adsorbent, the dust is prevented from adhering to the wall surface of the apparatus, which is an expensive apparatus. Can be omitted, and the sticky dust from the powdery adsorbent can be reliably removed by an adhering dust treatment device that heats the treatment to several hundred degrees.

[Brief description of drawings]

FIG. 1 is a system diagram of a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of the ribbon agitator 12 in FIG.

FIG. 3 is an isotherm adsorption diagram showing the relationship of the adsorption amount with respect to the harmful / malodorous gas component concentration in the gas to be treated.

FIG. 4 is a system diagram of a second embodiment of the present invention.

5 is an isothermal adsorption diagram for explaining an adsorption operation mode of the second embodiment shown in FIG. 4. FIG.

FIG. 6 is a system diagram of a third embodiment of the present invention.

FIG. 7 is a system diagram of a fourth embodiment of the present invention.

FIG. 8 is a system diagram of a fifth embodiment of the present invention.

9 is an enlarged sectional view of the regenerator in FIG.

FIG. 10 is a system diagram of a sixth embodiment of the present invention.

FIG. 11 is a typical prior art perspective view.

[Explanation of symbols]

 8 Air Flow Transfer Means 9 Blower 10 Pipeline 11 Separation Means 12, 39 Regenerator 14 Exhaust Gas Pipeline 15 Adsorbent Supply Pipeline 20A, 20B Rotary Valve 21A, 21B Pipeline 31, 38 Cyclone 34 Transport Pipeline 35 Hot Air Generating Means 54 Transportation pipeline

Claims (4)

[Claims] 1. A powdery adsorbent is mixed with a gas to be treated containing sticky dust and harmful / odorous gas components at two locations, an upstream side and a downstream side, to attach and separate the adhesive dust while carrying an air stream. In addition to adsorbing harmful / foul-smelling gas components, then separating the purified gas and powdery adsorbent, and heating the separated adsorbent with a small flow rate of regeneration gas flowing. The deodorizing and malodorous gas components are desorbed and regenerated, and the regenerated adsorbent is mixed with the gas to be treated again at the two points on the upstream side and the downstream side to cause the adsorption and adsorption. Concentration method of harmful / bad odor gas. 2. A powdery adsorbent is mixed with a gas to be treated containing adhesive dust and harmful / odorous gas components at two locations, upstream and downstream, to attach and separate the adhesive dust while carrying an air stream. In addition to adsorbing harmful / odorous gas components, they are separated into a purified gas and a powdery adsorbent, and a part of the separated adsorbent is reused as the gas to be treated on the upstream side. After mixing and adhering and adsorbing, the remaining amount of the separated adsorbent is heated in a state where a small flow rate of regeneration gas is flowed,
A method for concentrating harmful or malodorous gas, characterized in that the harmful or malodorous gas component is desorbed and regenerated, and the regenerated adsorbent is mixed again with the gas to be treated for adhesion and adsorption. 3. A powdery adsorbent is mixed with a gas to be treated containing sticky dust and harmful / odorous gas components at two locations, an upstream side near an inflow end and a downstream side near an outflow end. And an adsorbent separated by the separating means, which is supplied with a small flow rate of the regeneration gas, and a separating means for separating the adsorbent from the gas to be treated containing the adsorbent from the air conveying means. A regenerator that is desorbed by mixing and heating the adsorbent and supplies the desorbed adsorbent separately to the upstream side and the downstream side of the airflow conveying means. A concentrating device characterized by obtaining a malodorous gas component. 4. A powdery adsorbent is mixed with a gas to be treated containing sticky dust and harmful / odorous gas components at two locations, an upstream side near an inflow end and a downstream side near an outflow end. And a separation means for separating the adsorbent from the gas to be treated containing the adsorbent from the above-mentioned air-conveying means and feeding it out by a predetermined amount, and supplying a part of the adsorbent to the upstream side of the air-conveying means. Means and a regeneration gas are supplied at a small flow rate, and the adsorbent separated and fed out by the separating means is mixed and heated to be desorbed, and the adsorbent after desorption is supplied to the downstream side of the airflow conveying means. A concentrating device, including a compressor, for obtaining concentrated harmful / odorous gas components from a regenerator.