JPH0585B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cleaning device in a gas deodorizing device using microorganisms.

[Prior Art] In recent years, biological deodorization methods have been attracting attention as gas deodorization methods because of their low processing cost and without the risk of secondary pollution.

In particular, various biological deodorization methods are currently under development in which microorganisms are immobilized in a packed bed, which saves space and enables highly efficient deodorization.

When microorganisms are immobilized in a packed bed, in order to maintain the activity of the microorganisms and prevent changes in the bacterial flora, it is necessary to periodically supply water to the microorganisms, and to ensure that the microorganisms decompose and assimilate malodorous components contained in the gas. It is necessary to wash away the various products generated during deodorizing, and if this washing is insufficient, the activity of microorganisms will be inhibited, and the deodorizing effect will eventually be completely lost.

In order to increase the cleaning effect of the packed bed, it is most effective to increase the amount of washing water flowing per unit time, but when the amount of washing water is increased, the space inside the packed bed is reduced due to the presence of the washing water, and the ventilation is reduced. Problems occur such as a sudden increase in resistance and a decrease in removal efficiency due to the short pass of the odor gas.

In order to solve these problems, conventional methods have been to limit the amount of washing water per unit time, divide the packed bed into multiple stages in the flow direction of the deodorizing gas, and wash each stage sequentially to reduce the amount of water removed during cleaning. The effect of reduced efficiency was reduced.

An example of a cleaning device in a conventional biological deodorizing method will be explained with reference to FIG. In the figure, 1 is a deodorizing tower, inside which there are multiple packed beds 2 in which packing materials (carriers) (not shown) are stacked, and microorganisms are immobilized on the surface of the carriers in each packed bed 2. There is. Reference numeral 3 denotes a water sprinkling device provided for periodically sprinkling water to the packed bed 2 in each stage, and a water supply pipe 6 connected to a washing water tank 4 provided at the bottom of the deodorizing tower 1 via a pump 5. It is comprised of a branch pipe 8 branched from the water supply pipe 6 via a valve 7 at each stage, and a large number of nozzles 9 attached to the branch pipe 8 for jetting cleaning water.

Next, its effect will be explained. The gas to be treated 10 is fed from the lower part of the deodorizing tower 1, and while rising and passing through the packed bed 2 of each stage, it is brought into contact with microorganisms immobilized on the surface of the carrier, and the gas contained in the gas to be treated 10 is removed by the microorganisms. Disperses malodorous components. Products generated as a result of decomposition in the packed bed 2 of each stage are washed away from the surface of the carrier by periodically operating the water sprinkler 3 provided at each stage, for example, starting from the top stage. That is, first, only the valve 7 at the top stage is opened, and the pump 5 pumps the wash water in the wash water tank 4 through the water supply pipe 6 and the branch pipe 8, and the water is jetted from the nozzle 9 to spray water onto the packed bed 2 at the top stage.

Next, after sprinkling water for a certain period of time, the operation of the topmost water sprinkling device 3 is stopped, and the next water sprinkling device 3 is operated in the same manner as described above. Repeat this in order until the bottom row. In this way, the packed bed 2 at each stage is cleaned and the microorganisms are supplied with water.

The gas to be treated 10 is passed through the packed beds 2 of each stage, so that the malodorous components contained therein are removed as described above, and the gas 10 to be treated is released into the atmosphere from the upper part of the deodorizing tower 1 as a treated gas 10a.

[Problems to be Solved by the Invention] In the conventional cleaning method for gas deodorizing equipment as described above, since the gas to be treated is passed through and the gas is cleaned,
There are the following problems.

(1) During cleaning, the area of the gas flow path in the packed bed is reduced due to the presence of cleaning water, resulting in a short pass of the gas to be treated, resulting in an extremely poor odor removal performance.

This effect cannot be avoided even if the packed bed is divided into a plurality of parts in the gas flow direction and sequentially cleaned.

(2) During cleaning, even if the gas flow area in the packed bed decreases due to the presence of cleaning water, the amount of gas passing through is constant, so the ventilation pressure loss increases extremely. This effect cannot be avoided even if the packed bed is divided into a plurality of parts in the gas flow direction and sequentially cleaned.

(3) Even during cleaning, a gas flow portion exists within the packed bed, which impedes the uniform flow of cleaning water. In particular, since the amount of washing water per hour is usually limited in order to reduce the effects of items 1 and 2 above, it is more difficult to uniformly wash the entire packed bed.

For this reason, the odor concentration of the processing gas fluctuates, and in some cases, the discharged processing gas may have to be further processed.

In order to solve the above-mentioned conventional problems, the present invention has the following features:
By adopting a special function, a large amount of cleaning water is dropped all at once into each area divided parallel to the flow direction of the processing gas in the packed bed.
It is an object of the present invention to provide a cleaning device for a gas deodorizing device that takes a short cleaning time and does not cause a sudden increase in ventilation pressure loss during cleaning and a decrease in malodorous component removal performance.

[Means for Solving the Problems] The cleaning device in the gas deodorizing apparatus according to the present invention divides the packed bed in the deodorizing tower in the direction in which the gas to be treated flows in parallel, and places a certain amount of water above the packed bed. A water receiving bucket that tilts when receiving washing water is pivotally supported, a water supply pipe is provided for supplying washing water to the water receiving bucket, a rotating shaft that pivotally supports the water receiving bucket is supported vertically movably; When the water receiving bucket is full, it descends due to its own weight, and when it is empty, it rises due to the force of the spring, and in the process of rising, the discharge end of the water receiving bucket is directed toward the next divided area of the packed bed. An automatic intermittent rotation mechanism is provided for regulating the rotation angle of the rotation shaft.

[Function] The cleaning device according to the present invention is provided above the packed bed, and when a certain amount of cleaning water has accumulated in the water receiving bucket, which is supported almost horizontally when empty, the discharge end of the bucket is lowered by its own weight. Since it is tilted, a large amount of washing water in the water bucket can be dumped onto the divided areas of the packed bed. As a result, various products of biodegradation in the area are washed away all at once. In addition, when the water receiving bucket is empty, the water receiving bucket is raised by the spring force, and during the rising process, the rotating shaft is rotated by a predetermined angle by an automatic intermittent rotation mechanism to keep the water receiving bucket almost horizontally. Then, the discharge end is directed to the next area, so that when the water receiving bucket is filled with water afterwards, the same cleaning operation as above can be performed on this area again. In this way, the water receiving bucket is automatically and intermittently rotated until the water supply to the water receiving bucket is stopped, and a large amount of washing water is automatically dropped into each divided area, rapidly cleaning every corner.
Provides moisture to microorganisms. Moreover, in areas other than the area being cleaned, the gas to be treated flows in parallel and continuously, and biological deodorization processing is performed normally, so there is no reduction in deodorization efficiency or malodorous component removal performance. do not have.

[Example] Hereinafter, an example of the present invention shown in the drawings will be described in detail.

FIG. 1 is a schematic configuration diagram showing one embodiment of a cleaning device for carrying out the cleaning method according to the present invention;
It is an AA sectional view of the figure. As shown in both figures, in this embodiment, a cylindrical deodorizing tower 1 is provided with a
A plurality of packed bed blocks 2a to 2f (in the figure, 6
(indicated separately). Further, a shaft 12 is erected at the center of the packed bed 2, and a water-receiving bucket 13 is supported on the upper protrusion of the shaft 12 by a trunnion 14 so as to be freely tiltable. This water bucket 13
For example, as shown in Fig. 3, the volume on one side of the trunnion 14 is made smaller than the volume on the other side, and the wall thickness of the side wall is made thicker, so that when empty, the trunnion 14 makes it almost horizontal. However, if cleaning water accumulates inside, the drain end 1
3a is configured to descend and tilt.
Washing water is supplied from the washing water tank 4 to the water supply pipe 6 by the pump 5.
The water is continuously supplied to the water receiving bucket 13 little by little. The water receiving bucket 13 is provided with an automatic intermittent rotation mechanism 15 that rotates intermittently on the central shaft 12 so as to face each of the packed bed blocks 2a to 2f sequentially.

This mechanism 15 will be explained with reference to FIGS. 3 and 4. Figure 3 is a sectional view showing this mechanism, and Figure 4 is a cross-sectional view showing this mechanism.
The figure is a developed view of the main part of the cam guide groove. As shown in FIG. 3, the rotary shaft 16 supporting the water bucket 13 is inserted into the upper hollow part 17 of the central shaft 12, and the lower part of the rotary shaft 16 is supported by a spring 18. Usually two cam followers 19 are provided on the outer circumference of the rotating shaft 16, and the upper hollow part 17 of the central shaft 12
As shown in FIG. 4, a substantially wave-shaped cam guide groove 20 with which the cam follower 19 engages is provided on the inner periphery of the groove.
FIG. 4 shows a state in which a part of the cam guide groove 20 is expanded in the lateral direction. It consists of Therefore, when the water receiving bucket 13 is empty, the cam follower 19 is located at the peak of the cam guide groove 20 to push up the rotating shaft 16 by the force of the spring 18, and when the water receiving bucket 13 is filled with washing water, the cam follower 19 is located at the peak of the cam guide groove 20. The rotating shaft 16 resists the force of the spring 18 due to its own weight.
is pushed down, and the cam follower 19 is located in the valley of the cam guide groove 20 following the trajectory 21. When the cleaning water from the bucket 13 is dropped, the cam follower 19 rises again, but the tip 20 of the upper cam surface 20a
c, the trajectory 21 takes a forward direction, and therefore stops when it reaches the next peak. Also, when the cam follower 19 descends, it is similarly restricted by the tip 20d of the lower cam surface 20b.
It reaches the next valley and stops. In this way, the stopping position of the cam follower 19 shifts by half a pitch each time the water receiving bucket 13 repeats vertical movement. The bucket 13 automatically rotates intermittently at the same angle.

Automatic intermittent rotation mechanism 1 of this water receiving bucket 13
5, when a certain amount of cleaning water has accumulated in the water receiving bucket 13 for a region divided in the circumferential direction of the packed bed 2, for example, the packed bed block 2a, the bucket 13 is lowered and its discharge end 13a is lowered. Since it rotates around the trunnion 14 and tilts downward, a large amount of washing water in the water receiving bucket 13 is dropped. This washing water flows down the packed bed block 2a all at once and washes every corner. Therefore, various products caused by biodegradation of the packed bed block 2a can be washed away all at once. When the water receiving bucket 13 is empty, it returns to a nearly horizontal state and rises due to the force of the spring 18 due to the decomposition amount. During this rising process, the cam follower 19 moves along the trajectory 21 into the cam guide groove as described above. In order to reach the next peak 20 and stop, the water receiving bucket 13 rotates by a predetermined angle around the central axis 12 and faces the next packed bed block 2b.

The water receiving bucket 13 is continuously supplied with water little by little from the water supply pipe 6, and this controls the time until the water becomes full, that is, the cleaning time.When the water receiving bucket 13 is filled with washing water, the above-mentioned process is performed again. The cleaning water is dropped onto the packed bed block 2b. In this way, each of the packed bed blocks 2c to 2f is sequentially and regularly cleaned, and the same operation is repeated many times until the water supply to the water receiving bucket 13 is stopped.
are automatically cleaned. In addition, in FIG. 1, 22 is a washing water dispersion plate provided on the upper surface of the packed bed 2 as necessary, and is used to uniformly disperse the dropped washing water especially when the surface area of the packed bed 2 is large. belongs to.

On the other hand, when one packed bed block is being cleaned, the gas to be treated 10 is flowing into other packed bed blocks, so the biological deodorization process is not being performed normally in these packed bed blocks. There is. Therefore, if the packed bed capacity is set so that the entire amount of gas to be treated can be treated in the other packed bed blocks except for the packed bed block being cleaned, the deodorizing efficiency will not decrease at all during cleaning.

Furthermore, since a large amount of washing water is flushed down all at once, the washing water is distributed to every corner of the packed bed block, making it possible to perform reliable washing.

In the above embodiment, the water receiving bucket 13 is supported at the upper end of the central shaft 12 so as to be vertically movable and rotatable. It may also be configured to be supported vertically and rotatably. In this case, the rotating shaft 16 of the water receiving bucket 13 will be supported by a tension spring.

[Effects of the Invention] As described above, according to the present invention, a large amount of cleaning water in the water bucket can be made to flow down at once in each of the areas divided into an appropriate number so that the gas to be treated flows through the packed bed in parallel. Since the cleaning is performed, the cleaning time is extremely short, and the inside of the packed bed can be thoroughly cleaned from every corner. Moreover, since the biological deodorization process is normally performed in areas other than the area being cleaned, great effects such as no increase in ventilation pressure loss or deterioration of deodorization performance can be obtained.
In addition, by employing a special automatic intermittent rotation mechanism in the water bucket, the cleaning operation can be performed without using any external power, making it possible to provide an extremely inexpensive and highly reliable device.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an embodiment of a cleaning device according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG.
FIG. 3 is a sectional view showing an automatic intermittent rotation mechanism for a water receiving bucket, FIG. 4 is a developed view of a cam guide groove of the same mechanism, and FIG. 5 is a schematic diagram of a conventional cleaning device. 1... Deodorizing tower, 2... Packed bed, 6... Water supply pipe,
10... Gas to be treated, 13... Water bucket,
15... Automatic intermittent rotation mechanism, 16... Rotating shaft, 1
8... Spring, 19... Cam follower, 20... Cam guide groove.

Claims (1)

[Claims] 1. A deodorizing tower, a packed bed having a plurality of regions in which microorganisms are immobilized and divided in the flow direction of the gas to be treated, and a pivot that can be tilted freely at a weight unbalanced position above the packed bed. a water-receiving bucket that receives a certain amount of washing water while supporting the water-receiving bucket; a water supply pipe that supplies washing water to the water-receiving bucket; a rotating shaft that pivotally supports the water-receiving bucket and is vertically movable; When the water receiving bucket is full, it descends under its own weight, and when the water receiving bucket is empty, it rises due to spring force, and in the process of rising, the discharge end of the water receiving bucket is directed to the next divided area of the packed bed. A cleaning device for a gas deodorizing device, comprising: an automatic intermittent rotation mechanism that regulates the rotation angle of the rotating shaft.