JPS6269032A - Dust and germ removing device for gas - Google Patents

Abstract

PURPOSE:To miniaturize the title device and increase dust removing efficiency as well as germs removing efficiency by a method wherein fine water drip particles are sprayed from lower stage spray nozzles and rough water drip particles are sprayed from upper side spray nozzles while air is sent upwardly into a tower to contact it with the water drip particles through convection. CONSTITUTION:Water spraying spray nozzles are arranged in a water washing tower 5 by dividing them into the spray nozzle groups 7a, 7b in upper and lower stages. The spray nozzle group 6b in the lower stage is provided with spray nozzles having small diameter to spray the shower of fine water drip particles of approx. 200mum while the spray nozzle group 7a in the upper stage is designed so as to generate the shower of rough water drip particles of approx. 500mum. The rough water drip particles shower of fine water drip particles is sprayed against the same air in the lower part of the tower. The contaminated air flow, containing dust and germs, is introduced into the water washing tower 5 from the lower part thereof through a fan 3 and a filter 4, then, ascends in the tower as shown by an arrow A and contacts with the showers of water drip particles by convection during ascending.

Description

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

This invention is a gas dust removal/removal @ device that cleans indoor air by removing dust and sterilization for 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, reference numeral 1 denotes a room such as a food processing room where air purification is to be performed, and an air circulation passage 2 is constructed between the air intake port and the air supply port of the enclosure 1, and a blower 3. Pre-filter to remove coarse dust 4. Washing tower 5. and sky! ! ! Devices 6 are installed in order, and these devices constitute a system of dust removal and sterilization devices. 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. The water particles adhering to the tower are converted into water droplets by the washing and dust collection action, separated and collected from the air stream, and settle in the tower and accumulate at the bottom. On the other hand, the air stream that has been purified by dust removal and sterilization is discharged from the upper part of the tower, and after the temperature and humidity are adjusted by the air conditioner 6, it 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 through a filter 9 containing adsorbent substances such as activated carbon and ion exchange resin.
W1 is used repeatedly so that it is sprayed into the tower from the spray nozzle 7 via the water pump 8. Note that 10 is a drain valve that drains washing waste water out of the system when washing water in the tower is periodically replaced. By the way, in order to increase the dust removal and sterilization efficiency in the water washing tower 5 in the above-mentioned dust removal and sterilization equipment, the air streamer flowing from the bottom to the top of the tower and the spray nozzle 7 disperse the spray into the tower. It is necessary to increase the rate of contact with the water droplet particles B and the relative speed of collision to increase the collection rate of dust and dirt. Therefore, in order to achieve this, the spray nozzle 7 should be made smaller and the spray speed should be increased to generate many fine water droplets (
7. Thereby, a method is generally adopted in which the surface area of water droplets is increased with the same amount of water, thereby increasing the contact ratio with the air flow. On the other hand, the finer the diameter of the water droplets sprayed from the spray nozzle, the more they are affected by the airflow rising inside the tower, and the water droplets are carried by the airflow rising inside the tower while taking in dust and bacteria. The proportion of the particles escaping outward from the water washing tower 5 increases, and if this continues, the efficiency of dust removal and sterilization will decrease. Therefore, in order to avoid such water droplets escaping outside the tower, it is necessary to reduce the speed of the air flowing inside the tower, but for this reason, the diameter of the water washing tower 5 has to be increased to process the same amount of air. A problem arises in which the size of the vehicle becomes larger.

[Purpose of the invention] The present invention has been made in view of the above points, and provides a cleaning and sterilization device that eliminates the drawbacks of the conventional devices described above and has a compact configuration and has high dust removal and sterilization efficiency, especially its water spray type water washing tower. The purpose is to provide [Key points of the invention]

In order to achieve the above object, the present invention provides a water washing tower with spray nozzles that spray water droplets into the tower in multiple stages, upper and lower, and the spray nozzles on the lower stage spray fine water droplets onto the upper stage. The spray nozzle sprays coarse water droplets, and the gas flow introduced into the tower is blown upward from below to bring it into convection contact with the water droplets,
In the lower region of the water washing tower, sufficient contact is made between fine water droplets and the contaminated gas flow introduced into the tower, thereby increasing the efficiency of collecting dust particles and bacteria in the contaminated gas flow by the water droplets. In the upper region of the tower, the fine water droplets that rise together with the rising gas stream are captured by coarse water droplets and allowed to settle downward by gravity, resulting in high dust removal,
It is designed to provide sterilization efficiency.

[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, the spray nozzles for water spraying provided inside the water washing tower 5 are divided into upper and lower spray nozzle groups 7a and 7b, where the lower spray nozzle group 7b is used for spraying water. The nozzle has a small diameter mouth and sprays a shower of fine water droplets of about 200 μm, whereas the upper spray nozzle group 7a is a nozzle set to generate a shower of coarse water droplets of about 500 μm. It consists of Note that 11 is a flow rate control valve inserted in a branch pipe to the spray nozzle group at each stage, 12 is a water supply pipe that supplies cleaning water into the tower, 13 is a water level control valve inserted in the same pipe, and 14 is a water level control valve inserted in the same pipe. An eliminator for removing water droplets is installed at the upper part of the water washing tower 5, 15 is a drip removal cyclone for removing water droplets connected to the rear stage of the water washing tower 5, and 16 is a filter inserted in the drain pipe. Next, the operation of the above configuration will be explained. During operation, water pumped by the water pump 8 is supplied to the upper and lower spray nozzle groups 7a and 7b through the flow rate control valve 11, and a shower of fine water droplets P and b is generated in the lower area of the tower. A shower of coarse water droplets Ba is dispersed and sprayed onto the area. On the other hand, dust extracted from a room not shown, Wi
The contaminated air flow containing the contaminated air is introduced from below into the water washing tower 5 through the blower 3 and the prefilter 4, and flows upward in the tower as shown by arrow A, and during this ascending process, it comes into convection contact with the water droplet shower described above. 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, dirt, etc. contained in the air stream are converted into water droplets. Transferred and collected. At the same time, a shower of coarse water droplets is being sprayed from the spray nozzle 7a on the upper stage in the F direction of this area, and the fine water droplets that have taken in dust and bacteria that rise and float up in the tower with the airflow are coarse. It is captured by water droplets, sinks downward by gravity against the flow of air, and accumulates at the bottom of the tower. In this way, the spraying of cleaning water into the tower is divided into two lower stages, with a shower of coarse water droplets at the top and a shower of fine water droplets at the bottom, making it possible to replenish dust and dirt. While increasing the collection efficiency, it is also possible to effectively prevent fine water droplet particles from escaping outward from the water washing tower by riding on the air flow. Furthermore, by installing an eliminator 14 in the upper part of the water washing tower 5 and a drip removal cyclone 15 at the rear stage of the water washing tower 5, coarse water droplets flow through the gap in the shower Ba and flow to the downstream side together with the air flow. The fine water droplets that are intended to be removed can also be separated and collected from the air flow, thereby making it possible to further improve dust removal and sterilization efficiency. Next, the results of an experiment conducted by the present inventor in order to confirm the evaluation of the above-mentioned dust removal and weight removal performance will be shown. Experimental conditions: Upper spray nozzle (1 nozzle) with the configuration shown in Figure 1.
Water droplet size is 500μ billion, lower spray nozzles (4 pieces)
The water droplet size is 200μ, the amount of spray water is 400A/h, and the amount of air processed is 68n? /h, air flow velocity 0.27m/s
The air containing dust of various particle sizes is treated with a water washing tower to remove dust, and the particle size distribution of the dust contained in the air after dust removal is measured, and the dust removal efficiency is determined for each particle size. Ta. Experimental results: According to the results of dust removal under the above experimental conditions,
The dust removal efficiency on the particle size side is 100% when the particle size is 2.0 μm or more.
99.8% for 1.0 μm or more, 9 for 0.5 μm or more
A good dust collection efficiency of 8.7% and 94.2% was obtained at 0.2 μm or more.

【Effect of the invention】

As described above, according to the present invention, the water washing tower is divided into upper and lower stages with spray nozzles that spray water droplets into the tower, and the spray nozzles on the lower stage spray fine water droplets onto the upper stage. Coarse water droplets are sprayed from the spray nozzle of the tower, and the gas flow introduced into the tower is blown upward from the bottom to bring it into convective contact with the water droplets. Effectively separates and collects minute amounts of dust and bacteria. We were able to obtain a dust removal and sterilization device with high removal and closure efficiency.

[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 and sterilization device.
In the figure, 2: Gas circulation air passage, 3 = Air blower, 5: Water washing tower, 7a
: Spray nozzle for spraying coarse water droplets, 7b: i Spray nozzle for spraying fine water droplets, 14: Eliminator for drip removal, 15: Droplet removal cyclone, A: Contaminated air flow, Ba
, Bb: spray shower of cleaning water. 7゛3T patent attorney 1 Yamaguchi y

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 equipped with spray nozzles that spray water droplets into the tower in multiple upper and lower stages; The spray nozzles in the tower spray fine water droplets, and the upper spray nozzles spray coarse water droplets, and the gas flow introduced into the tower is blown upward from below to bring it into convection contact with the water droplets. A gaseous dust removal and sterilization device characterized by: 2) In the dust removal/sterilization device according to claim 1, the diameter of the water droplets sprayed from the lower spray nozzle is approximately 200 μm, and the diameter of the water droplets sprayed from the upper spray nozzle is approximately 500 μm. A gaseous dust removal and sterilization device characterized by: 3) The dust removal and sterilization device according to claim 1, characterized in that a drip removal cyclone for removing water droplets from the gas flow is connected to the rear stage of the water washing tower. Device.