JP2019051095A - Gas deodorization device - Google Patents

Abstract

To solve the problem that a technology for suppressing high corrosiveness and pungent odor of ozone to the minimum is required, whereas, in gas-cleaning equipment using ozone for cleaning, high corrosiveness or fishy-smelling characteristic pungent odor of ozone is a problem in use, regardless of its cleaning capacity.SOLUTION: There is provided an environment-friendly gas-cleaning equipment in which, an existing place of ozone in the equipment is restricted, gas discharge after gas cleaning is performed in a short time, and an ozone degradation apparatus is provided outside a chamber to degrade ozone in washing water, to thereby suppress negative aspects such as corrosiveness or pungent odor caused by use of ozone, and further washing water is recycled.SELECTED DRAWING: Figure 1(a)

Description

  The present invention relates to a gas deodorization apparatus used in a place where odors from organic solvents, odors generated from domestic animals, etc., and odors such as garbage disposal sites are problematic.

  There are several methods for conventional deodorization in places where odors from organic materials used for deodorization, odors generated from domestic animals, and odors in landfills are problematic. Among them, representative deodorization methods include (1) cleaning method, (2) combustion method, (3) adsorption method, and (4) biological deodorization method.

  The cleaning method (1) is a method in which the odor and the cleaning liquid are brought into gas-liquid contact, and the odor component is removed by a reaction such as absorption, neutralization, and oxidation with the cleaning liquid, and deodorized. As the chemical solution, sulfuric acid, hydrochloric acid, caustic soda, or the like is used. However, there is a problem that the cleaning solution itself has an odor, and the waste solution of the cleaning solution is often required.

  Further, the combustion method (2) is a reliable deodorization method particularly for high-concentration odor. This method uses fuel, facilities, etc. for incineration, which can lead to environmental problems as well as temperature and global warming problems.

  The adsorption method (3) is a method in which odor is adsorbed on a solid surface such as activated carbon or zeolite. Here, it is necessary to develop a method for detecting a decrease in adsorption capacity and to quantify the effective period.

  The biological deodorization method (4) is a deodorization method for removing odors by utilizing the metabolic function of microorganisms. In order to maintain this effect, the constant propagation of microorganisms is indispensable, and in addition to requiring a large space such as a medium for propagation, it is necessary to manage the propagation conditions such as temperature. In this way, there are problems that must be solved to achieve a certain condition.

JP 2009-136748 A JP 2011-031227 A

  There are various deodorization methods, but when implemented, there are drawbacks in that the apparatus becomes large, the structure is complicated, and maintenance is expensive. Although the present invention is a deodorizing device using ozone, ozone has a high deodorizing efficiency of gas, but it is difficult to avoid corrosion of the device due to the oxidizing action of the device. In particular, there is a problem of technology that reduces the cost by avoiding corrosion of pipes and pumps as much as possible, reduces running costs, facilitates maintenance, and considers the environment.

  In order to solve such problems, the present invention decomposes ozone after use while limiting the area where ozone exists while decomposing odorous gas by the oxidizing power of ozone present in the wash water to suppress odor. In addition, a gas cleaning device that minimizes corrosion of pumps and piping by recirculating cleaning water that does not contain ozone is provided.

  Specifically, the ozone existence region is limited to the deodorization-related part from the step of dissolving ozone in the cleaning water to the deodorization of the gas in the chamber and the ozone decomposition part. By performing the cleaning water recirculation outside the ozone-existing region, it is possible to provide a gas cleaning apparatus in which the pump and piping are not affected by ozone, and the running cost such as maintenance is suppressed while considering the environment.

  By letting the cleaning water containing ozone flow down naturally from the cleaning water storage unit equipped with the nano ozone bubble generator installed outside the chamber to the gas-liquid contact part in the chamber and making gas-liquid contact with odorous gas It oxidizes and decomposes ozone in the gas. The cleaning water after contact is sent from the cleaning water reservoir after contact at the bottom of the chamber to the ozone decomposing unit outside the chamber, and ozone is decomposed. Wash water after ozonolysis is returned to a nano-ozone bubble generator installed in the upward direction of piping outside the chamber by a pump. By sending and circulating the cleaning water after ozone decomposition to the cleaning water storage unit outside the chamber, the pump and piping are not affected by ozone, and the running cost can be suppressed while considering the environment.

  Although the present invention is a gas cleaning device that uses oxidative decomposition by ozone and has a high deodorizing effect, corrosion of ozone in the pump and piping can be suppressed by decomposing ozone in the cleaning water after contact outside the chamber. In addition, it is possible to provide an environmentally friendly gas cleaning device by refluxing the cleaning water.

Sectional drawing from gas intake to deodorization and gas discharge of the deodorizer. In FIG. 1 (a), the gas introduced in a thick space is guided from the inlet to the gas-liquid contact portion. Sectional drawing from gas intake to deodorization and gas discharge of the deodorizer. In FIG. 1B, gas is dispersed and discharged through several inlets. Explanatory drawing of guiding cleaning water after contact to ozone decomposition section under natural flow by introduction section for decomposition Illustration of the wash water reservoir after contact inside the chamber Figure of gas inlet in the wash water storage tank after contact Diagram of the ozone decomposing unit for the first maintenance inspection in the washing water storage unit Figure of ozone decomposing part for second maintenance inspection of washing water storage tank after contact Figure of barn that becomes deodorization object of deodorization device (A) perspective view and (b) cross-sectional view of the retina of the gas-liquid contact portion Figure of washing water shower means

Embodiments of the present invention will be described below.
<Outline of Embodiment 1>
<Overview>

  The deodorizing apparatus of this embodiment purifies gas with ozone water containing ozone, and separates and distributes ozone in advance so that ozone does not pass through the long piping of the pump outside the chamber. Piping and pump deterioration can be prevented so that the motor shaft and metal parts in the motor are not damaged.

In FIG. 1 (a), odorous gas is introduced so as to be released into the chamber (0112) from the tube port of the gas introduction part (0104). The area of the gas-liquid contact portion is desirably an area that can receive the gas discharged from the pipe without leakage. In FIG. 1 (b), the gas inlet port is placed below the gas-liquid contact portion, and gas is introduced into the gas-liquid contact portion from below by a large number of gas inlet ports located above the tube. By introducing gas extensively into the gas-liquid contact area, the contact efficiency of the gas with ozone is enhanced.
<Configuration>

The deodorizing apparatus includes a chamber (1112), a gas-liquid contact part (0111), a gas introduction part (0104), a washing water storage part (0108), an ozone bubble generator (0109), a gas discharge part (0114), an ozonolysis Part (0105) and a reflux part (0115). Hereinafter, the configuration of each unit will be described.
<Chamber>

  The “chamber” (0112) stores the main part where deodorization takes place. Wash water containing nano-ozone bubbles is made by dissolving ozone in the wash water in the external wash water reservoir (0108). And it is sent to the washing water shower means (0110) in a chamber, becomes a shower, disperses | distributes to the gas-liquid contact part (0111), falls, and stays in this while flowing down. The odorous gas (0103) is released into the chamber that is fed through the pipe of the gas introduction part (0104), and thus comes into contact with the cleaning water containing ozone in the gas-liquid contact part, and the ozone in the cleaning water is oxidized. Destroy gas odor.

  The deodorized gas moves upward, and after ozone is removed by the ozone removing device (0101), it is discharged to the outside from the gas discharge unit (0114). The above basic process is performed in this chamber. The cleaning water containing ozone goes to the bottom of the chamber after gas-liquid contact, and is sent to an external ozone decomposition unit connected by a pipe provided at the bottom, where ozone is decomposed.

Nano-ozone bubbles are fine bubbles of ozone. The exact definition of nanobubbles varies depending on the application field and generation method. Generally, nanobubbles with a size of 1 micrometer or less are called nanobubbles, and since bubbles are extremely small, they are transparent to the naked eye even if they are generated. Looks like water.
<Gas-liquid contact part>

  The “gas-liquid contact part” (0111) refers to a retinal part provided below the washing water shower means in the chamber, and the gas after the gas-liquid contact is discharged from the gas discharge part. FIG. 8A is a perspective view of the gas-liquid contact portion, and shows a retinal cylindrical shape. FIG. 8B is a cross-sectional view when the gas-liquid contact portion is cut by A. FIG. Gas-liquid contact with the gas occurs while the wash water dispersed and poured from the wash water shower means stays in the retinal portion. Since the gas-liquid contact part is retinal, the area where the gas called gas comes into contact with the liquid called washing water increases, resulting in high contact efficiency between the odorous gas and liquid and the decomposition of odors due to the oxidizing power of ozone. High efficiency.

After the deodorized contact, the gas passes through the upper ozone removing section (0101), the ozone is removed, and only the gas is discharged outside from the gas discharging section. After the deodorization, the cleaning water that falls downward and reaches the bottom of the chamber contains residual ozone. After the ozone is removed by the ozone removing section, it is discharged to the outside. FIG. 9 shows an example of the shape of the washing water shower means.
<Gas introduction part>

  The “gas introduction unit” (0104) introduces odorous gas into the chamber. A odorous gas drawn from a place (0103) with a strong odor generated from a large number of domestic animals such as a barn as shown in FIG. 7 is sent into the chamber by a blower (0116). Odorous gas from a barn or the like is drawn in by a pipe, and the blower applies pressure to feed into the chamber, so that the washing water flows in the opposite direction and does not flow into the chamber and reach the barn or the like.

The method of bringing the odorous gas into contact with the cleaning water in the chamber includes releasing the odorous gas below the gas-liquid contact part, raising it from below and sending it to the gas-liquid contact part, and cleaning the chamber with ozone. There is a method of directly introducing an odorous gas to be washed into water.
<Washing water reservoir>

  The washing water storage unit (0108) is provided above the chamber outside the chamber and stores washing water in which ozone is dissolved. As for the washing water, the ozone water used for deodorization by the ozone decomposing unit outside the chamber is decomposed after contact, and the washing water is pushed up by the pump (0107) and returned to the washing water reservoir. To reach.

  An ozone generator (0109) is provided in the washing water storage unit, and ozone produced by the ozone generator is dissolved and stored in the refluxed washing water. The ozone stored in the cleaning water storage part is dissolved and the cleaning water is sent to the nano ozone bubble shower means (0110) under natural flow, dispersed and poured into shower-like water droplets, and reaches the gas-liquid contact part. Here, as the difference in height (h) between the bottom surface of the cleaning water reservoir and the cleaning water shower means increases, the pressure of the cleaning water increases, and the momentum of the cleaning water from the cleaning water shower means increases. For example, when the wash water in the wash water reservoir is 300 liters to 500 liters and the height difference is 50 centimeters to 1.5 meters, the precipitation from the wash water shower means to the gas-liquid contact portion is 5 liters to 10 liters per minute. It becomes.

In addition, ozone remaining in the wash water after contact is decomposed by the ozonolysis device, and only the wash water without ozone is recirculated through the pipe by the pump, reducing the burden on the pump and pipe and reducing the cost of replacement etc. In addition, an environment-friendly reuse system can be provided.
<Ozone bubble generator>

  The “ozone bubble generation unit” (0109) is installed in the upper wash water retention unit outside the chamber and generates nano ozone bubbles. The ozone is dissolved in the cleaning water stored in the cleaning water storage unit, becomes ozone-containing cleaning water, and is used for gas deodorization.

  The cleaning water containing ozone in the cleaning water storage part is sent to the cleaning water shower means in the chamber to become a shower and pours into the gas-liquid contact part. Nano-ozone bubbles in the cleaning water are contained in the chamber in the gas-liquid contact part. The odor of gas sent from below to the gas-liquid contact part is oxidatively decomposed and deodorized. The cleaning water is sent to an ozone decomposing machine and separated from ozone, and the ozone is decomposed. On the other hand, the cleaning water recirculates inside the tube outside the chamber and returns to the cleaning water storage unit containing the ozone bubble generator.

  In the present invention, the ozone existence region (0102) in the chamber is limited. The ozone generated by the ozone bubble generating part outside the chamber plays a role of deodorizing inside the chamber, is sent again outside the chamber through the pipe, reaches the ozone decomposer, and is decomposed there. Therefore, not only the ozone is not discharged to the outside, but also the influence of corrosion on the pump and pipe provided outside can be minimized.

There are several methods for artificially generating ozone bubbles, such as a creeping discharge method, a plasma ion (silent discharge) method, and an electrolysis method. Any method may be used for the deodorizing apparatus.
<Gas discharge part>

  The “gas discharge part” (0114) is provided in the upper part of the chamber, and is configured as an ozone removing part (0101) and a blower fan (0113). The blower fan is provided to send out the odor-treated gas to the outside, and may have an ozone removing unit (0101) so that ozone that has not been used rises in the chamber and is not discharged to the outside.

The gas discharge unit discharges the processed gas to the outside. The gas deodorized by the oxidative decomposition by ozone dissolved in the cleaning water at the gas-liquid contact portion in the chamber may be discharged out of the chamber by the blower fan (0113).
<Ozone decomposition unit>

The ozone decomposing unit (0105) is configured to take in the cleaning water after contact from the cleaning water storage tank after contact at the lower end of the chamber, and send the ozone-treated cleaning water to the cleaning water storage unit outside the chamber. The cleaning water containing ozone that has not been used for deodorization by oxidative decomposition is decomposed by ozone in the ozone decomposing unit and returned to the cleaning water storage unit, so that the pump and pipe are not corroded. The refluxed washing water is reused by dissolving ozone generated by the built-in ozone generator again and heading for the next washing cycle.
<Reflux part>

  The “refluxing part” (0115) exists outside the chamber that is outside the ozone existence region (0101), and is configured as a pump or an external pipe outside the chamber. The contacted wash water is sent to the upper wash water reservoir. The pump (0107) pushes and returns the cleaning water after contact after decomposing ozone by the ozonolysis device via the pipe (0106) and sends it to the cleaning water reservoir.

  The cleaning water containing ozone in the chamber will corrode the pumps and pipes as they are, but before entering the pumps and pipes, the ozone is decomposed in the ozone decomposition section, and the cleaning water containing no ozone is pumped out. The pipe is pushed up and sent to the upper wash water reservoir, which greatly reduces the possibility of corrosion.

  Pumps are composed of impellers, bearings, external casings and other members, and various metal materials and resins are used from rolled steel to stainless steel. Since resins other than metals and fluorine-based resins are oxidatively decomposed by ozone, it is desirable to avoid contact with ozone as much as possible. The main piping materials are carbon steel pipes, stainless steel pipes, aluminum pipes, PVC pipes and other resin pipes, coated steel pipes and galvanized steel pipes. It is desirable that the washing water to be passed does not contain ozone. By placing the reflux section outside the chamber, the complexity and maintenance cost of the apparatus are reduced, and the deodorizing apparatus is easy to use.

<Overview of Embodiment 2>
<Overview>

In this embodiment, in addition to the feature 1 of the embodiment, a decomposition introducing portion (0202) for allowing the cleaning water contacted at the gas-liquid contact portion to be introduced into the ozone decomposition portion (0201) under a natural flow. It is a gas cleaning device. By introducing the cleaning water containing ozone into the ozone decomposition section by natural fall, it is not necessary to install one pump in the ozone existing area and send cleaning water containing ozone, and replacement of the pump becomes unnecessary. , Cost reduction. Since ozone corrodes the pump, maintenance and replacement costs for the corroded pump are required. However, in the present embodiment, it is not necessary to use the pump in the ozone presence region, and maintenance costs can be reduced.
<Configuration>

  This embodiment is composed of an ozone decomposition introduction section (0202) for sending cleaning water from the bottom of the chamber to the ozone decomposition section, a reflux section pipe (0204) outside the chamber, and an ozone decomposition section (0201). The cleaning water after contact that falls from the gas-liquid contact part at the bottom of the chamber is allowed to flow naturally using the pipe of the introduction part for decomposition, so that the cleaning water after contact containing ozone is sent to the ozone decomposition part and decomposed by ozone. is there. The cleaning water after contact after ozonolysis is pushed up in the pipe by a pump outside the chamber and is returned to the cleaning water reservoir.

  Natural flow does not require additional energy, and after contact, the wash water is sent to the ozone decomposition section slightly below as shown in FIG. Therefore, ozone is decomposed, and the cleaning water after decomposition is sent to the cleaning water reservoir (0205) through the pipe by the pump (0203) for reuse. Therefore, replacement and maintenance costs are reduced, and an environment-friendly device is provided.

<Overview of Embodiment 3>
<Overview>

This embodiment is a gas cleaning apparatus having a cleaning water storage tank (0301) for storing cleaning water after contact after contact with gas at the bottom of the chamber.
<Configuration>

  The post-contact cleaning water storage tank (0301) is a part in the chamber for storing the post-contact cleaning water after ozone treatment that falls from the gas-liquid contact portion. It is configured to feed into the disassembly unit. It can be said that the buffering function of the decomposition capability of the ozone decomposing part is achieved by the amount of the post-contact cleaning water in the post-contact cleaning water reservoir.

<Outline of Embodiment 4>
<Overview>

This embodiment is one of the deodorization methods using the oxidative decomposition of gas odor by ozone. In addition to the method of releasing odorous gas at the lower part of the gas-liquid contact part and sending it to the gas-liquid contact part, as shown in FIG. In this method, the gas is introduced into the washing water reservoir via the gas inlet (0401) and decomposed by ozone present in the washing water after contact.
<Configuration>

  This method consists of a blower (0404) for sending odorous gas to the gas inlet, a gas inlet (0401) for introducing odorous gas, a cleaning water reservoir (0402) after contact in the chamber, and a gas after deodorization. It is comprised from the ozone removal part which removes ozone from.

  The gas introduction port falls from the gas-liquid contact part, and directly introduces the odorous gas into the post-contact cleaning water stored in the post-contact cleaning water storage part in the chamber to make contact. The gas cleaning port is provided in the cleaning water reservoir (0402) after contacting the introduced gas. Odorous gas is sent to the cleaning water in the storage section through the gas inlet, and ozone contained in the cleaning water oxidizes and decomposes the gas to deodorize it. The gas deodorized by ozonolysis is discharged upward out of the chamber after the ozone is removed upward by the ozone removing device (0403).

  Although this embodiment is one of the methods for oxidative decomposition of odors by ozone along with gas discharge to the gas-liquid contact portion, these two methods can be performed simultaneously. In addition, since the odorous gas from the barn etc. is drawn in and sent into the chamber under pressure by the blower (0404), the washing water does not flow back and reaches the barn etc.

<Overview of Embodiment 5>
<Overview>

The ozone decomposing section for first maintenance inspection (0501) decomposes ozone dissolved in the cleaning water stored in the cleaning water storage section (0502) provided outside the upper part of the apparatus at the time of maintenance inspection, Installed to reduce the health and environmental risks of maintenance personnel due to ozone emissions.
<Configuration>

  The first maintenance / inspection ozonolysis device is provided in a container installed in the washing water reservoir as shown in FIG. The main application is to reduce the health and environmental risks of maintenance personnel by decomposing and discharging ozone contained in the cleaning water in the cleaning water storage section in the chamber during maintenance inspection.

  A nano-ozone bubble generator (0503) is installed in the washing water storage section provided outside the upper part of the apparatus, and ozone is dissolved in the stored washing water. For this reason, it is indispensable to decompose ozone in the wash water during maintenance inspections to reduce environmental risks and health risks of maintenance personnel due to ozone emissions. There are safety management standards issued by various industries and organizations, but most of the standards do not exceed 0.05 to 0.1 ppm.

<Summary of Embodiment 6>
<Overview>

In the cleaning water storage device provided at the bottom of the chamber, there is a second maintenance inspection ozone decomposition unit (0601) for decomposing ozone remaining in the cleaning water (0602) after contact in the stored cleaning water during maintenance inspection. It is equipped.
<Configuration>

  The second maintenance / inspection disassembling part (FIG. 6) is provided in a container installed in the washing water storage tank after contact. During maintenance and inspection, it is installed to reduce the health and environmental risks of maintenance personnel by decomposing and discharging ozone contained in the cleaning water in the cleaning water storage tank in the chamber. It is activated during maintenance and inspection to decompose ozone in the cleaning water in the chamber cleaning water reservoir.

  The first maintenance / inspection disassembling part of FIG. 6 is provided in the cleaning water storage part outside the upper chamber, and the cleaning water containing ozone generated by the ozone generator is stored. Similarly, cleaning water containing ozone stays in the cleaning water storage section (0602), and it is indispensable to decompose and discharge ozone during maintenance and inspection. There are safety management standards issued by various industries and organizations, but most of the standards do not exceed 0.05 to 0.1 ppm.

Chamber: 0112
Wash water reservoir: 0108, 0206, 0502
Nano ozone bubble generation part: 0109, 0503
Ozone-containing wash water naturally flowing below: 0110
Gas-liquid contact part: 0111
Wash water storage tank after contact: 0301, 0402, 0602
Ozone existing area: 0102
Ozone decomposition unit: 0105, 0201
Ozone decomposition introduction part: 0202
Reflux part: 0115, 0205
Reflux section piping: 0106, 0204
Reflux section pump: 0107, 0203
Gas discharge part: 0114, 0304
Ozone removal unit: 0101, 0302, 0403
Blower fan: 0113, 0303
Odor generating source, etc .: 0103
Gas introduction part: 0104
Gas inlet: 0401
Blower: 0116, 0404
First maintenance inspection disassembly part: 0501
Second maintenance inspection disassembly part: 0601

Claims (6)

A chamber;
A gas-liquid contact portion including a washing water shower means provided in the chamber;
A gas introduction part for introducing gas into the chamber;
A cleaning water storage section for supplying cleaning water to the gas-liquid contact section under natural flow;
An ozone bubble generator for containing ozone bubbles in the wash water stored in the wash water reservoir;
A gas discharge unit that discharges the gas that has contacted the cleaning water in the gas-liquid contact unit to the outside of the chamber;
An ozone decomposing unit for decomposing ozone remaining in the cleaning water by introducing cleaning water in contact with the gas at the gas-liquid contact unit;
A recirculation unit including a pump for recirculating cleaning water decomposed by ozone remaining in the ozone decomposition unit to the storage unit;
A gas cleaning device.   The gas cleaning apparatus according to claim 1, further comprising a decomposition introducing portion for allowing natural introduction of the cleaning water that has come into contact with the gas at the gas-liquid contact portion into the ozone decomposition portion.   The gas cleaning apparatus according to claim 1 or 2, wherein the chamber bottom is a post-contact cleaning water reservoir for storing cleaning water in contact with gas.   The gas cleaning apparatus according to claim 3, wherein a gas inlet of the gas inlet is provided in the post-contact cleaning water storage tank.   The gas cleaning apparatus according to any one of claims 1 to 4, wherein the cleaning water storage section includes a first maintenance inspection ozone decomposition section for decomposing ozone during maintenance inspection.   The gas cleaning apparatus according to any one of claims 1 to 5, further comprising a second maintenance inspection ozone decomposition section for decomposing ozone in the chamber during maintenance inspection.

Images