JPS6219885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention divides a space inside a casing into a processing fluid passage region and a desorption/heating fluid passage region, and rotates a cylindrical adsorbent positioned in this space around its axis. The present invention relates to a device for adsorbing and desorbing harmful components, which is configured to alternately pass through both passage zones.

In this type of adsorption/desorption device, adsorption and desorption actions are alternately repeated in each of the divided areas for one adsorbent, so that at the end of the desorption heated fluid passage area, the adsorbent is desorbed. The heating fluid is heated to a temperature suitable for desorption, and the temperature at the beginning of the fluid passage region to be treated is high, and due to this high temperature, not only is the adsorption effect not sufficiently exerted, but the material to be desorbed is Since it remained in the adsorbent and mixed into the gas after the adsorption treatment, the concentration of the harmful substance contained after the treatment was not much different or more than before the treatment. For this reason, even if the adsorption effect is exerted well in other fluid passage areas to be treated, there is a certain limit to the reduction in the concentration of the harmful substances contained after treatment.

In order to eliminate such inconveniences, conventionally, as shown in Japanese Patent Application Laid-Open No. 53-50069, a fluid passing through the starting end portion in the rotational direction of the adsorbent in the passage area of the fluid to be treated has been proposed. In order to reuse the gas after treatment as part of the desorption fluid, means have been adopted to guide it to the introduction path of the desorption fluid. With this configuration, the gas concentration after adsorption treatment can be reduced, and the heat of the adsorbent recovered in the gas after adsorption treatment immediately after passing through the desorption zone can be reused as thermal energy for desorption. It is advantageous.

The present invention solves the disadvantage that the adsorption action is not sufficiently performed at the starting end portion of the fluid passage area to be treated, and the concentration of the fluid to be treated passing through that portion is not sufficiently reduced. The purpose of this is to enable the fluid to be treated that has passed through the duct to be effectively used as a means for improving the adsorption/desorption efficiency, rather than guiding it to the introduction path of the desorption fluid.

The characteristic configuration of the present invention for achieving the above object is to divide the space inside the casing into a treatment fluid passage region and a desorption/heating fluid passage region, and a cylindrical adsorbent positioned in this space. In a harmful component adsorption/desorption device configured to rotate around an axis and pass alternately through both passage areas, the outlet of the to-be-treated fluid passage area is connected to a narrow portion at the upper end of the adsorbent in the rotational direction and the other side. The present invention is characterized in that a mixing path is provided for supplying the fluid to be treated passing through the narrow portion to the fluid to be treated supply path to the fluid passage area, and the following functions and effects can be obtained from this configuration. play.

In other words, the fluid to be treated passes through the upper end in the rotating direction of the adsorbent in the fluid passage region to be treated,
Since it is not directly discharged to the outside but is returned to the treated fluid supply path, it is possible to reduce the concentration of the treated fluid after adsorption treatment.

In addition, the fluid to be treated discharged from the upper end in the rotating direction of the adsorbent on the exit side of the fluid passage area has a higher temperature than the fluid to be treated before being supplied to the adsorbent. If it is mixed into the fluid supply path, the temperature of the fluid to be treated before being supplied will be slightly increased and the relative humidity of the fluid to be treated will be reduced compared to the case where it is not mixed. Therefore,
As the relative humidity decreases, the adsorption efficiency of the fluid to be treated improves, and among the substances adsorbed by the adsorbent, the amount of moisture adsorbed decreases, and this decrease in the amount of moisture adsorption reduces the desorption energy. It works extremely effectively in the above-mentioned process, and is a much more effective way to utilize energy than the conventional example mentioned above, in which the processed fluid is mixed with the desorption fluid and simply used as thermal energy for desorption. As a result, while good adsorption can be performed, harmful components can be easily separated and recovered at a high concentration ratio that reduces the amount of desorption air.

Next, embodiments of the present invention will be described.

First Embodiment (see FIGS. 1, 2, and 3) FIG. 2 shows an exhaust air treatment device for a painting booth H using the harmful component adsorption/desorption device L of the present invention.

Reference numeral 1 is an adsorbent formed into a cylindrical honeycomb shape made from a paper made by mixing activated carbon fibers, asbestos fibers, etc.

As shown in FIG. 1, this adsorbent 1 is housed in a cylindrical space within a cylindrical casing 2.
A rotation device 4 is provided to rotate a rotation center shaft 3 fixed at the center of the adsorbent 1 within the casing 2 in the direction of the arrow in the figure. This rotating device 4 is configured to continuously rotate the adsorbent 1 at a constant speed and in a constant direction using an electric motor or a transmission device, and since the specific configuration is well known, a description thereof will be omitted.

Partition walls 21,
21', 22, 22', and 22'' form an inlet 7 and an outlet 8 of the fluid passing region 6 to face each other,
The inlet 10 and outlet 11 of the processing fluid passage area 9 for desorption are formed to face each other, and the interior of the casing 2 is substantially divided into both passage areas 6 and 9. The inlet 7 of the treated fluid passage area 9 is connected to the terminal end of the exhaust pipe 12 of the coating booth H, which is a supply path for the treated fluid A.

The outlet 8 of the treated fluid passage area 9 has an area of 1/1/1 of the total area of the upper end outlet 8 of the adsorbent 1 in the rotational direction.
A narrow portion 8' is provided which has a width equivalent to 20 mm and is separated from the other outlet portion 8''.
The fluid A' to be treated which has passed through and exits from this narrow portion 8' is mixed with the fluid A which has not yet passed through. The starting end of the supply cylinder 13 to the painting booth H is connected to the other outlet portion 8''.Although not shown in the drawing, there is an air conditioner, an outside air intake, and an exhaust port in the middle of the supply cylinder 13. It has a mouth.

An inlet 10 of the fluid passage area 9 for desorption is connected to the terminal end of a blower tube 15 from a heater 14 that heats and blows air to about 100° C. to 130° C. required for desorption. The outlet 11 is connected to the starting end of a supply path 18 to a recovery device 17 that cools and recovers organic components.

The volume of the heated air B from the heater 14 is set to about 1/4 to 1/30 of the volume of the fluid A to be treated in the exhaust pipe 12.

A cooling device 19 is provided in the middle of the mixing path 16, and the exhaust pipe 12 is passed through this path 16.
It is configured to cool the passing fluid A' supplied to the painting booth H to lower the temperature of the fluid A or to maintain the fluid A at a temperature substantially similar to that in the coating booth H.

FIG. 3 shows changes in the concentration of harmful components at the narrow portion 8' and other portions 8'' of the outlet 8 of the fluid passage area 6 to be treated, as well as the outlet 11 of the desorption fluid passage area 9, with the concentration plotted on the vertical axis. , the rotation angle of the adsorbent 1 is shown on the horizontal axis.

As is clear from FIG. 3, it is clear that the content concentration in the narrow portion 8' is significantly higher than that in the other outlet portions 8''. By mixing the passing fluid A' with the unpassed fluid A, the concentration after treatment is reduced to a lower concentration at the other outlet portion 8''.

In addition, in FIG. 3, xylene is added to the fluid A to be treated.
The xylene containing 100 PPm was treated in the apparatus of this embodiment, and in the other outlet section 8'' of the fluid passage area 6, the xylene content was approximately 5 PPm. The xylene content was approximately 800PPm at the beginning of the
The highest xylene content at the outlet 11 of the desorption fluid passage zone 9 was about 2000 PPm, and the overall concentration ratio was 12 times.

The width of the inlet and outlet of the desorption fluid passage area 9 is approximately 30°.
The width of the inlet and outlet of the adsorbed fluid passage area 6 is approximately 330 mm.
The width of the narrow portion 8' is approximately 165°.

Second embodiment (not shown) A combustion device is provided in place of the cooling recovery device 17, and the organic solvent contained is converted into a harmless one by combustion, and this combustion device is also used as the heater 14, The desorption gas is heated by burning the components contained after desorption.

The specific structure of this recirculating attachment/detachment structure is well known, so a detailed explanation will be omitted. Note that it is also possible to heat the air heading toward the desorption zone 9 using exhaust gas from the combustion device using a heat exchanger, and use this heat exchanger as a heater.

Third Embodiment (See FIG. 4) As shown in FIG. 5, the flow of the fluid A to be treated and the fluid B for desorption to the adsorbent 1 is in the radial direction of the adsorbent 1. The specific structure for making the flow flow in the radial direction is publicly known as shown in Utility Model Application Publication No. 1941-1941, Publication No. 40059-1980, and Publication No. 125152-1971, respectively. Detailed explanation will be omitted.

However, the outlet 8 of the fluid passage area 6 to be treated is divided into a narrow portion 8' on the upper side in the rotational direction of the adsorbent 1 and another portion 8'', as in the first embodiment. It is connected in communication with the mixing path 16.

Fourth Embodiment (not shown) The adsorbent 1 is configured to rotate intermittently, and the other features are the same as those in the first to third embodiments.

As a specific configuration, an intermittent rotation motor is used as the electric motor of the rotation device 4, and the motor is rotated a predetermined number of times at regular time intervals to move the adsorbent 1 to the narrow portion 8'.
The structure is such that it rotates every width equal to the width of.

Alternatively, an on/off electromagnetic clutch is provided in the transmission structure of the rotating device 4, and the on/off of the on/off electromagnetic clutch is controlled by an electric pulse oscillator to move the attracting body 1 at every angle corresponding to the width of the narrow portion 8'. It has a structure that alternately emits an on-rotation signal and an off-rotation signal to cause intermittent rotation.

Fifth Embodiment (See FIG. 5) As shown in FIG. 3 above, the concentration at the width equivalent to the starting end of the outlet 11 of the desorption fluid passage area 9 is significantly lower than that at other parts of the outlet 11. Part exists. This low portion reduces the concentration ratio of harmful components, making it difficult to perform separation, recovery, and combustion treatment. In order to eliminate this drawback, the outlet 11 is divided into a narrow part 11' at the starting end and another part 11'' by utilizing the concept of the specific structure shown in the above embodiments, and from the narrow part 11'' After passing through, the desorption fluid B' is configured to be mixed with the control fluid A that has not passed through the second mixing path 16'.

The rest is the same as the first to fourth embodiments described above.

In this case, the fluid to be treated A and the fluid for desorption B
It is preferable that the main components are substantially the same.

The following modifications can be made to the above embodiments.

The adsorbent 1 is not limited to a paper-like material mixed with fibrous activated carbon, but also a paper-like material made of a mixture of powdered activated carbon with other fiber materials, or a conventionally well-known adsorbent suitable for harmful substances to be adsorbed and desorbed. It may be a paper-like material impregnated with an agent, or a granular material made of activated carbon or other adsorbent and held in shape within a mesh frame.

The fluid to be treated is not limited to air, but may be a liquid such as a gas containing impurities or a waste liquid.

The desorption fluid is not limited to heated air, but steam or conventionally known non-flammable gas such as nitrogen gas may be used, or conventionally known desorption fluids determined by the material of the adsorbent 1 and the material of the fluid A to be treated and the impurities contained therein. It may be a gas or a liquid.

The device of the present invention is not limited to the paint booth H, but may also be used to purify exhaust gas and wastewater from other factories. Further, the air supply path 13 may be directly open to the outside world, or may be used as a purifying device in an air conditioner for a room other than the painting booth H.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the device for adsorbing and desorbing harmful components according to the present invention, FIG. 1 is a partially cutaway perspective view showing an adsorbent and its casing of the first embodiment, and FIG. 2 is a partially cutaway perspective view of the adsorbent of the first embodiment. Block diagram showing the whole, Figure 3 is the first
FIG. 4 is a schematic perspective view showing a part of the third embodiment, and FIG. 5 is a block diagram showing the fifth embodiment. 2... Casing, 1... Adsorbent, 6... Fluid passage area for desorption, 9... Heated fluid passage area for desorption, 8
...Outlet, 8'...Narrow width portion, 8''...Other outlet portions, A'...Fluid to be passed through, 16...Mixing path.

Claims (1)

[Claims] 1. The space inside the casing 2 is used as a fluid passage area 6 for the fluid to be treated.
The cylindrical adsorbent 1 positioned in this space is divided into a desorption heating fluid passage area 9 and a cylindrical adsorbent body 1 is rotated around its axis to allow harmful components to pass alternately through both passage areas 6 and 9. In the adsorption/desorption device, an outlet 8 of the treated fluid passage area 6 is divided into a narrow portion 8' at the upper end in the rotational direction of the adsorbent 1 and another portion 8'', and the narrow portion 8' Processed fluid passing through
A device for adsorbing and desorbing harmful components, characterized in that a mixing path 16 is provided for supplying A' to the fluid supply path 12 to the fluid passing region 6. 2. The suction/desorption device according to claim 1, wherein the area of the narrow portion 8' is 1/10 or less of the area of the other outlet portion 8''. 3. The desorption/desorption fluid passage area 9 The device for adsorbing and desorbing harmful components according to claim 1 is provided in the middle of the desorption fluid path from the heating device 14 for the desorption fluid B to the harmful component separation and recovery device 17. The desorption fluid passage area 9 is provided in the desorption fluid path between the heating device 14 for the desorption fluid B and the combustion processing device.
Adsorption/desorption equipment for harmful components as described in Section 1. 5. The device for adsorbing and desorbing harmful components according to any one of claims 1 to 4, wherein the adsorbent 1 is formed of a honeycomb-shaped mixed paper containing activated carbon. 6. The device for adsorbing and desorbing harmful components according to claim 5, wherein the mixed paper is made by mixing activated carbon fibers with other fibers. 7. The device for adsorbing and desorbing harmful components according to claim 5, wherein the mixed paper is made by mixing powdered activated carbon with a fiber material. 8. The device for adsorbing and desorbing harmful components according to claim 5, wherein the mixed paper is made by mixing granular activated carbon with a fiber material.