JPS6269033A - Dust and germ removing device for gas - Google Patents

Abstract

PURPOSE:To make small the size of a device to remove dust and germs in gas and raise its efficiency by providing a cleaning water circulating and supplying system with a spray nozzle and ozone supplying means to supply ozone for sterilization of the water in the pool at the bottom section of a water tower, and water drop removal means and ozone removal device installed on the gas exhaust side of a water cleaning tower. CONSTITUTION:In a cleaning water circulating and supplying system installed to a water cleaning tower 5, a water atomization spray nozzles to be installed in the tower are provided in upper stage spray nozzle group 7a and lower stage spray nozzle group 7b. The water cleaning tower 5 in provided with, an ozonizer 14 which generates ozone as a sterilizer and an ozone supply means which draws ozone from the ozonizer 14 and consists of an ozone supply nozzle 15 as a bubble-generating device provided at the liquid pool of the bottom section of the water cleaning tower 5. Further, in addition an eliminator 16 for removal of water drops is provided as water drop removal means on the exhaust side of the water cleaning tower 5, and at the rear stage of the water cleaning tower 5 a water drop removal cyclone 17 for removal of water drops and an active charcoal filter 18 which removes ozone from the gas are provided. In the drain water discharge pipe route, a filtering device for the discharged cleaning water is inserted.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

This invention is a gaseous dust removal and sterilization device that cleans indoor air by removing dust and sterilization from food processing rooms, food storage rooms, operating rooms in hospitals, hospital rooms, and other sterile workplaces. Regarding.

[Prior art and its problems]

First, a conventional general system of the gaseous dust removal and sterilization device described above with reference to FIG. 2 will be explained. In the figure, 1 is a room such as a food processing room that is the target of air purification, and an air circulation and blowing passage 2 is constructed between the air intake port and the air supply port of the room 1. Pre-filter to remove dust 4. Washing tower 5. and sky! The 1M devices 6 are installed in order, and these devices constitute a dust removal and sterilization device system. Here, the water washing tower 5 includes a spray nozzle 7 that sprays minute water droplets into the tower, a water pump 8.
It is constructed as a spray type cleaning dust collector equipped with a water spray system that connects water filters 9 and the like. With this configuration, the indoor contaminated air containing dust and bacteria drawn out from the room 1 by the blower 3 is introduced into the lower part of the washing tower 5 after first removing coarse dust with the pre-filter 4. Here, while the contaminated air rises inside the tower as shown by arrow A, it comes into contact with fine water droplets B that are sprayed from the spray nozzle 7 and fills the space inside the tower, and the particulate dust and dirt contained in the air are removed. Bacteria and the like adhering to the tower are transferred to water droplets by the cleaning and dust collection action, separated and collected from the air flow, and then settle in the tower and accumulate at the bottom. On the other hand, the air stream that has been purified through dust removal and sterilization is discharged from the top of the tower, and is even emptier! After adjusting the temperature and humidity with the PJ device 6, the air is sent back into the room 1 again. On the other hand, the water accumulated at the bottom of the water washing tower 5 is filtered by a filter 9 containing adsorbent substances such as activated carbon and ion exchange resin, and then passed through the water pump 8 and sprayed into the tower from the spray nozzle 7 again. used repeatedly. Furthermore, lO
is a drain valve that drains cleaning waste water out of the system when the cleaning water in the tower is replaced periodically. However, the configuration of the conventional dust removal/sterilization device described above has the following problems. That is, first of all, in order to increase the dust removal and sterilization efficiency in the water washing tower 5, the air flow A flowing from the bottom to the top inside the tower comes into contact with the water droplet particles B dispersed and sprayed into the tower from the spray nozzle 7. Dust increasing the proportion and relative speed of collision. It is necessary to increase the bacterial collection rate. For this purpose, the spray nozzle 7 is made smaller and the spray speed is increased to generate many fine water droplets, thereby increasing the surface area of the water droplets with the same amount of water and increasing the contact ratio with the air flow. This method is generally adopted, but the smaller the size of the water droplets sprayed from the spray nozzle, the more susceptible they are to the influence of the airflow rising inside the tower, and the water droplets continue to move inside the tower while taking in dust and bacteria. A large proportion of the air is carried away by the rising airflow and escapes from the washing tower 5 to the outside, and if this continues, the efficiency of dust removal and sterilization will decrease. On the other hand, in order to prevent such water droplets from escaping outside the tower, it is possible to reduce the wind speed of the air flowing inside the tower. This results in the problem of larger equipment. Another problem is that with the above-mentioned conventional device, bacteria contained in the contaminated air stream in the water washing tower 5 or bacteria separated and collected by washing and collecting dust from the air stream are actively removed. There is no means for sterilization, and as it stands, bacteria in the air stream that could not be collected by the water spray inside the washing tower will remain alive and escape from the washing tower 5 downstream from the washing tower 5 while remaining alive.
The problem remains that the seedlings collected in the water washing tower multiply in the water stagnant in the water pool, increasing the degree of contamination by bacteria in the spray tank. In this case, frequently drain the wash water out of the system.
It is possible to treat this wastewater after disinfecting and sterilizing it, but large-capacity washing towers use a large amount of washing water for spraying, and disposing of washing water each time would increase the amount of washing water consumed. Operating costs increase.

[Purpose of the invention]

This invention number was taken into consideration in view of the above points,
Eliminating the drawbacks of the conventional device described above, the device has a compact structure, has high dust removal and sterilization efficiency, and has comprehensive performance for gas purification and highly reliable dust removal and sterilization. The purpose is to provide a sterilization device.

[Key points of the invention]

In order to achieve the above object, the present invention provides a spray nozzle that is divided into upper and lower stages in a water washing tower, and sprays a shower of fine water droplets from the lower stage and coarse water droplets from the upper stage toward contaminated gas. a cleaning water circulation supply system including;
The tower is equipped with an ozone supply means for supplying ozone as a disinfectant into the water in the liquid pool at the bottom of the tower, and a water droplet removal means and an ozone removal means installed on the exhaust side of the washing tower. With this configuration, firstly, in the lower region of the water washing tower, there is sufficient contact between fine water droplets and the contaminated gas flow introduced into the tower, increasing the efficiency of scavenging dust particles and bacteria in the contaminated gas flow by the water droplets. At the same time, in the upper IL region of the tower, the fine water droplets that come to the surface together with the gas flow flowing upward from below are captured by coarse water droplets and allowed to settle downward by gravity. The fine water droplets that tend to flow out from the tower to the downstream side along with the air flow can be reliably removed from the air flow by the drip removal means, resulting in even higher dust removal and sterilization efficiency. . In addition, by supplying ozone into the water at the bottom of the tower, in parallel with the sterilization of bacteria collected in the cleaning water, the ozone gas released from the water into the tower directly sterilizes bacteria in the contaminated air stream. In this way, comprehensive dust removal and sterilization performance can be improved.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the invention, and the same members corresponding to FIG. 2 are given the same reference numerals. That is, according to the present invention, in the washing water circulation supply system provided in the washing tower 5, the water spray nozzles installed in the tower are divided into upper and lower spray nozzle groups 7a and 7b. Here, the spray nozzle group 7b on the lower stage has a small diameter spray nozzle and sprays a shower of fine water droplets of about 200 μI, whereas the spray nozzle group 7a on the upper stage has coarse water droplets with a diameter of about 500 μI. Consists of a nozzle configured to generate a shower. In addition, 11 is a flow control valve inserted in the branch pipe to the spray nozzle group of each stage, 12 is the water supply pipe that replenishes washing water into the tower, and 13 is a control valve for the water level in the tower inserted in the same pipe. It is. The water washing tower 5 is also equipped with ozone supply means consisting of an ozonizer 14 that generates ozone as a disinfectant, and an ozone supply nozzle 15 as a bubble generator pulled out from the ozonizer 14 and placed in the bottom liquid pool of the water washing tower 5. has been done. In addition, on the exhaust side of the water washing tower 5, there is an eliminator 16 for removing water droplets at the upper part of the inside of the water washing tower 5 as a drip removal means, and a drip removing cyclone 17 for removing water droplets is installed at the rear stage of the water washing tower 5. An activated carbon filter 18 is installed to remove ozone. Note that 19 is a filter for cleaning waste water inserted in the drain pipe line. Next, the operation of the above configuration will be explained. During operation, ozone generated by the ozonizer 14 is supplied to the ozone supply nozzle 15.
The ozone bubbles C become ozone bubbles C and are discharged and supplied into the washing water accumulated at the bottom of the washing tower 5, a part of which dissolves in the water, and the rest rises in the water as bubbles and is dissipated into the space inside the tower. Further, the ozonated water that is pressure-fed from the liquid reservoir in the tower via the water supply pump 8 is supplied to the spray nozzle groups 7a and 7b in the upper and lower stages through the flow control valve 11, and a shower of fine water droplets is created in the lower region of the tower. Bb is dispersed and a shower of coarse water droplets Ba is sprayed in the upper region. In this state, the lη-stained air flow containing dust and @ extracted from a room (not shown) is sent to the blower 3. It is introduced from below into the internal space of the water washing tower 5 through the pre-filter 4 and flows upward within the tower as shown by arrow A. During this ascending process, it is subjected to the sterilizing effect of the ozone atmosphere within the tower, and the water droplet particles described above are Dust and bacteria contained in the air stream are collected and separated by convection contact with the spray shower. In this case, first, the air stream is sprayed from the spray nozzle group 7b and efficiently contacts the fine water droplets filling the lower area of the tower, and the dust, bacteria, etc. contained in the air stream become the water droplets. Transferred and collected. At the same time, above this area is the upper spray nozzle 7a.
A shower of coarse water droplets is sprayed from the air stream, and the fine water droplets that incorporate dust and particles that rise up and float up in the tower with the airflow are captured by the coarse water droplets, and the airflow A
It sinks downward due to gravity and accumulates at the bottom of the tower. On the other hand, the airflow that has passed through the spray shower area of washing water inside the tower is removed by an eliminator 16 installed inside the tower and a subsequent drip-removal cyclone 17 to remove fine water droplets, and an activated carbon filter 18 to remove ozone. The air is sent back into the room via the air conditioner shown in FIG. 2. In addition, water washing tower 5
The water level of the washing water stored at the bottom of the tower is constantly monitored, and when the water level in the tower drops below a predetermined water level, clean water is replenished through the water level control valve 13. According to the results of experiments conducted by the present inventor to confirm the performance evaluation of the above-mentioned dust removal and sterilization equipment, the dust removal efficiency on the particle size side is 100% for particles of 2.0 μm or more, and 99% for particles of 1.0 μm or more.
A good dust collection efficiency of 8%, 98.7% for 0.5 μm or more, and 94.2% for 0.2 μm or more was obtained, and the purified air flow through the illustrated device and the cleaning tower It has been confirmed that the accumulated cleaning water has been sufficiently sterilized by the sterilization effect of ozone.

【Effect of the invention】

As described above, according to the present invention, the spray nozzle is divided into upper and lower stages in the water washing tower, and sprays a shower of fine water droplets from the lower stage and coarse water droplets from the upper stage toward the contaminated gas. A cleaning water circulation supply system containing water, an ozone supply means for supplying ozone as a disinfectant into the water in the liquid pool at the bottom of the tower, and a water droplet removal means and an ozone removal means installed on the exhaust side of the water washing tower. With this structure, it is possible to effectively separate and collect fine dust and W contained in contaminated gas with a compact structure, resulting in high dust removal and sterilization efficiency, and at the same time, the sterilizing effect of ozone can be achieved. This makes it possible to sterilize bacteria in the airflow flowing through the water washing tower and bacteria separated and collected within the tower, thus providing a dust removal and sterilization device with a high comprehensive gas cleaning effect.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of the present invention, and Fig. 2 is a system diagram of a conventional general dust removal/bacteria device. 5: Washing tower, 7a
: spray nozzle for spraying coarse water droplets, 7b: i spray nozzle for spraying fine water droplets, 14: ozonizer, 1
5 Niosin supply nozzle, 16: Eliminator for drip removal,
F: Drip removal cyclone, activated carbon filter for removing 18 niosine, A: Contaminated air flow, Ba. Bb, spray shower of wash water, C niosin. ]O Figure 2

Claims (1)

[Claims] 1) Contaminated gas containing dust and bacteria is introduced into a water washing tower, and water is sprayed onto the gas in the washing tower to remove dust and bacteria from the gas.
In a gaseous dust removal and sterilization device that separates and collects bacteria to purify contaminated gas, the water washing tower is divided into upper and lower stages, with fine water droplets from the lower stage and coarse water droplets from the upper stage. A washing water circulation supply system including a spray nozzle that sprays a shower of water toward contaminated gas, an ozone supply means that supplies ozone as a disinfectant into the water in the liquid pool at the bottom of the tower, and an ozone supply system on the exhaust side of the washing tower. 1. A gaseous dust removal and sterilization device comprising a water droplet removal means and an ozone removal means installed.