JPS60209227A - Deodorization of discarded gas - Google Patents

Abstract

PURPOSE:To arrange a soil deodorization method to be utilizable to discarded gases from several kinds of production process and to reduce deodorization cost by providing a discarded gas introducing chamber to the bottom side of a deodorization tank filled with soil and providing a sprinkling pipe to the discarded gas introducing chamber and the top of the soil layer. CONSTITUTION:Discarded gas generated in several production processes such as casting process is introduced into a discarded gas introducing chamber 5, led further to a main body 1 of a deodorization tank through holes 2a provided to a plate 2, deodorizing in the soil 4 and then dispersed to the outside from the top of the deodorization tank main body 1. Rain water flows through the soil 4 and stored in a water storage chamber 7. The water content of the soil is sensed by a water content sensor 14, and a pump 10 is driven by a controller 16 to spray the water in the water storage chamber 7 into the discarded gas introducing chamber 5 from the sprinkling pipe 8. The water level in the water storage chamber 7 is monitored with a water level meter 15. When the amt. of the water in the water storage chamber is defficient and the water content in the soil is sensed to be insufficient by the water content meter 14, a solenoid valve 13 is opened by the controller 16, and industrial water is sprayed on the soil 4 through the sprinkling pipe 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a waste gas deodorizing apparatus for deodorizing gas to be disposed of, which is generated in a casting process and other various production processes.

BACKGROUND OF THE INVENTION In various production facilities such as casting processes, gas containing phenol, ammonia, formaldehyde, etc. and having a bad odor is inevitably produced. If such a gas is released into the atmosphere as it is for disposal, the bad odor will be significant, so it is necessary to perform deodorization treatment before disposal.

Conventionally, chemical cleaning methods have been applied to deodorize waste gas generated during production processes. First, in deodorizing treatment using the chemical cleaning method, in order to improve the efficiency of deodorizing the gas, it is necessary to widen the gas-liquid contact interface between the gas and the deodorizing liquid, and in this case, the pressure loss of the waste gas supply pressure increases. As a result, the load on the blower increases, resulting in an increase in running costs. Furthermore, when using the chemical cleaning method, there is also the drawback that the work of storing and managing the chemicals for preparing the deodorizing chemical and adjusting the concentration of the deodorizing liquid is complicated. An even bigger problem is that the wastewater from the chemical cleaning system ■ contains a cloudy amount of N in the form of nitrogen compounds, and if this wastewater is discharged into rivers, it will cause the problem of eutrophication of the rivers. .

On the other hand, there is a soil deodorization method as a deodorization method other than the chemical cleaning method.
It has been used to deodorize atmospheric gas in some industries such as human waste treatment plants. Therefore, it is conceivable to apply the soil deodorization method to waste gas deodorization in casting processes and other various production processes. However, the waste gas generated in the production process is often dry, and when applying the soil deodorization method to deodorize such dry gas, the soil being deodorized becomes dry and the deodorizing performance decreases. From this point of view, it has been difficult to apply soil deodorization methods to deodorize waste gas in production processes.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional circumstances, and it is possible to apply the soil deodorization method to deodorize waste gas generated in each production process such as the casting process, thereby reducing the cost of waste gas deodorization. The purpose of this project is to provide a waste gas deodorizer that reduces waste gas emissions, streamlines work, and does not have negative effects on the outside world such as eutrophication of rivers.

The constitution of the invention, that is, the waste gas deodorizing device of the present invention is such that a waste gas introduction chamber for introducing waste gas from the outside is formed on the lower side of the llI2 odor tank body with the top open, and the waste gas introduction chamber and the deodorizing chamber are connected to each other. A ventilated support part is provided between the tank body and the deodorizing tank body on the support part is filled with soil, and a watering pipe is arranged in the waste gas introduction chamber and above the soil. It is something to do.

EXAMPLE An example of the waste gas deodorizing apparatus of the present invention will be described below with reference to FIG.

As shown in FIG. 1, the top of the deodorizing tank body 1 is open to the outside, and a plate 2 forming the bottom thereof is provided with a large number of small-diameter holes 2a. There are holes 2 on the plate 2.
A laminated portion 3 for uniformly dispersing gas is provided, in which a large number of pebbles having a diameter larger than the diameter of a are laminated, and the plate 2a and the laminated portion 3 form a support portion that allows ventilation. Deodorizing soil 4 is filled on the layered portion 3 in which a large number of pebbles 11j are layered, and the upper surface of the filled deodorizing soil 4 is exposed to the outside.

A gas introduction chamber 5 is provided below the deodorizing tank main body 1 along the lower surface of the plate 2a, and waste gas generated in the casting process (not shown) is supplied to the gas introduction chamber 5 by a blower 6. . Further, on one side of the gas introduction v5, a water storage chamber 7 having a bottom surface lower than the bottom surface of the gas introduction chamber 5 is formed.

Furthermore, a water sprinkling pipe 8 is arranged inside the gas introduction chamber 5 over the entire length from the blower 6 to the water storage chamber 7.
Water holes 9 are provided at regular intervals. Further, one end of the water sprinkling pipe 8 is connected to a pump 10 disposed in the water storage chamber 7, and water pumped up by this pump 10 is supplied to the water sprinkling pipe 8.

On the other hand, the deodorizing soil 41 filled in the deodorizing tank main body 1
Another watering pipe 11 is provided above the surface in a positional relationship that allows watering to be applied to the deodorizing soil 4, and the watering pipe 11 is provided with watering holes 12 at regular intervals. The water pipe 11
is connected to an industrial water supply source (not shown) via a solenoid valve 13.

A detection body 14a of a moisture meter 14 of a well-known mechanism is inserted into the deodorizing soil 4 filled in the deodorizing tank main body 1 from the outside of the deodorizing tank main body 1, and is installed on one side of the exhaust gas introduction chamber 5. In the water storage chamber 7, there is also a water level gauge 15 of a well-known mechanism.
is installed.

The moisture meter 14 and water level meter 15 described above output signals corresponding to the detected moisture value or water level value to the control device 16. The control device @16 sends signals corresponding to the input signals from the moisture meter 14 and the water level meter 15 to the pump 10.
and is output to the solenoid valve 13, and the pump 10 and the solenoid valve 13 operate based on the input signal from the control device 16.

In addition, in the exhaust gas deodorizing device of this embodiment, the deodorizing tank body 1
is placed outdoors, and a shield that blocks rainwater that falls on the soil 4 in the deodorizing tank body 1 during rain is actively removed.

According to the waste gas deodorizing apparatus of the above embodiment, waste gas is deodorized in the following manner.

Waste gas generated in a casting process (not shown) is introduced into a waste gas introduction chamber 5 by a blower 4. Waste gas introduction chamber 5
The waste gas introduced into the deodorizing tank main body 1 bottom plate 2
It enters the deodorizing tank main body 1 through the hole 2a. The waste gas that has entered the deodorizing tank main body 1 is uniformly dispersed in the laminated part 3, enters the soil 4, passes through the soil 4, and is dispersed from the upper part of the deodorizing tank main body 1 to the outside. In this process, components of the waste gas such as phenol, ammonia, formaldehyde, and cresol are adsorbed to the soil particles forming the soil 4 or absorbed by the moisture contained in the soil 4, and the waste gas is made odorless. Further, each component left in the soil 4 is decomposed and purified by microorganisms that inhabit the soil 4 in extremely large numbers. Therefore, the waste gas is continuously deodorized from then on.

However, the deodorizing performance of the soil 4 is greatly influenced by the moisture content of the soil 4, and the inventor has confirmed that the optimum moisture content is 30 to 80%. Therefore, if the dry waste gas supplied from the casting process is continuously deodorized for a long time, the moisture content of the soil 4 will decrease, and the deodorization performance will also decrease accordingly. As mentioned above, the waste gas deodorizing device of this embodiment is placed outdoors, and the moisture in the soil 4 can be replenished by rainwater when it rains. That is, when it rains, the rainwater falls on the soil 4 from the upper opening of the deodorizing tank main body 1, the rainwater flows down through the soil 4, flows into the waste gas introduction chamber 5 through the hole 2a of the plate 2, and the waste gas is The water is stored in a water storage chamber 7 provided on one side of the introduction chamber 5. In this process, the soil 4 is sufficiently replenished with moisture, and the soil 4 maintains or recovers good deodorizing performance. In addition, the rainwater stored in the water storage chamber 7 washes away the foul-smelling components of waste gases such as phenol and ammonia that remain undecomposed in the soil 4 as it flows down the soil 4, and the rainwater itself washes away the foul-smelling components of waste gases such as phenol and ammonia that remain undecomposed in the soil 4. Contains ingredients. However, since rainwater containing these components is stored in the water storage chamber 7 and reused as described later, it is not discharged to the outside, and therefore the outside is not contaminated.

On the other hand, when the soil 4 cannot be replenished with water by rainwater as described above, the moisture content of the soil 4 is adjusted to 11 as follows.

As mentioned above, the moisture meter 14 is attached to the deodorizing tank main body 1, and the moisture content of the soil fi 44 is constantly monitored by the moisture meter 14. The waste gas is fed from the blower 6 and passed through the soil 4 in the deodorizing tank main body 1 to deodorize the soil 4.
When the moisture content of water becomes below a certain level, it is detected by the moisture meter 14, and the pump 10 is driven by a command from the control device 16, and the waste water stored in the water storage chamber 7 is pumped up into the sprinkler pipe 8. The sewage pumped up into the water sprinkling pipe 8 is sprayed into the waste gas introduction chamber 5 through the water sprinkling hole 9, thereby humidifying the waste gas flowing into the deodorizing tank main body 1 from the waste gas introduction chamber 5. As a result of the passage of the humidified waste gas, the soil 4 ends up containing the required moisture.

As described above, when the water stored in the water storage chamber 7 is pumped up and the waste gas is repeatedly and continuously humidified by the water, the water evaporates from the deodorizing tank main body 11 and is gradually lost. If there is no rain during this process, the water stored in the water storage chamber 7 will eventually become insufficient. As mentioned above, the water level gauge 15 is attached to the water storage chamber 7.
The water level inside is constantly monitored by a water level gauge 15. Therefore, when the stored water in the water storage chamber 7 becomes insufficient and the water level falls below a certain level as described above, a signal is sent from the water level meter 15 to the control device 16, and in addition, the moisture meter 14 sends a signal of ±114
When a lack of moisture is detected in the controller l! 1
Based on the command 6, the solenoid valve 13 opens, and industrial water supplied from an industrial water supply source (not shown) is sprinkled onto the soil 4 from the sprinkler pipe 11. As a result, the soil 4 is washed and moistened in the same way as when it rains.

A soil suitable for removing ammonia was used as the soil 4 of the waste gas deodorizing apparatus of the above example, and waste gas from the casting process was actually deodorized, and the ammonia removal rate was measured.

As a result, the removal rate of ammonia was 95%, compared to about 85% in deodorization using the conventional chemical cleaning method.
A good result of % was obtained.

Effects of the Invention As described above, in the waste gas deodorizing device of the present invention, by using soil as the deodorizing material, extremely good deodorizing performance can be easily obtained, and the cost of waste gas deodorizing can be reduced. . Further, unlike when using a chemical solution to deodorize soil, wastewater containing excessive N is not produced, and the problem of eutrophication of rivers can be prevented. Furthermore, soil is relatively easy to store and manage, and there is also the advantage that the complicated work of adjusting the concentration of a deodorizing chemical solution, which is required when using a chemical solution, is not required.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an outline of a waste gas deodorizing apparatus according to an embodiment of the present invention. 1... Deodorizing tank body, 2... Plate, 3...
Laminated section, 4...Soil, 5...Waste gas introduction room,
6...Blower, 7...Water storage chamber, 8 Water sprinkler pipe, 10
...Pump, 11...Water pipe, 13...Solenoid valve, 16...Control mt device. Applicant Toyota Motor Corporation Representative Patent Attorney Yutaka 1) Hisashi Take (and 1 other person)

Claims (1)

[Claims] A waste gas introduction chamber for introducing waste gas from the outside is formed on the lower side of the deodorizing tank main body with the top open, and a ventilable support part is provided between the waste gas introduction chamber and the deodorizing tank main body. A waste gas deodorizing device, characterized in that a deodorizing tank main body on the support portion thereof is filled with soil, and a watering pipe is arranged in the waste gas introduction chamber and above the soil.