JPH0325702B2 - - Google Patents

Description

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

This invention is a gaseous dust removal and sterilization device that purifies indoor air by removing dust and sterilization from food processing rooms, food storage rooms, hospital operating rooms, 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 blowing passage 2 is constructed between the air intake port and the air supply port of the room 1, and a blower 3, A prefilter 4 for removing coarse dust, a water washing tower 5, and an air conditioner 6 are installed in order,
These make up the dust removal and sterilization device system. Here, the water washing tower 5 is configured as a spray type washing dust collector equipped with a water spray system that connects a spray nozzle 7 for spraying minute water droplets into the tower, a water pump 8, a water filter 9, etc. ing. 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 prefilter 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 adhering to the tower are transferred to water droplets due to the cleaning and dust collection action, separated and collected from the air flow, 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 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. Note 10
is a drain valve that discharges washing waste water out of the system when the washing 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 and the water droplet particles B dispersed and sprayed into the tower from the spray nozzle 7 are used.
It is necessary to increase the collection rate of dust and bacteria by increasing the contact ratio and the relative speed of collision. 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 diameter 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 rise inside the tower while taking in dust and bacteria. Washing tower 5 is carried by the air flow
The proportion of particles escaping to the outside increases, and if this continues, dust removal and sterilization efficiency will decrease. On the other hand, in order to prevent such water droplets from escaping outside the tower, it is possible to consider means of lowering the wind speed of the air flowing inside the tower. This results in the problem of increasing the size of the 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. Not equipped with means to sterilize
If this continues, the bacteria in the airflow that could not be completely 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, and will also be collected inside the washing tower. The problem remains that bacteria breed in the water that remains in the liquid pool, increasing the degree of bacterial contamination of the spray shower. In this case, it is conceivable to frequently discharge the washing water to the outside of the system, disinfect and sterilize this wastewater, and then treat it as wastewater. However, in a large-capacity washing tower, the amount of washing water used for spraying is large, and Disposing of the waste increases the consumption of washing water and increases operating costs.

[Purpose of the invention]

This invention was developed in consideration of the above points, and it eliminates the drawbacks of the conventional device described above, has a small structure, has high dust removal and sterilization efficiency, and is a gas-based device that can sterilize bacteria. The purpose is to provide comprehensive cleaning performance and highly reliable dust removal and sterilization equipment.

[Key points of the invention]

In order to achieve the above object, the present invention has 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 a shower of coarse water droplets from the upper stage toward 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. It was constructed as follows. With this configuration, firstly, in the lower region of the water washing tower, sufficient contact between fine water droplets and the contaminated gas flow introduced into the tower increases the efficiency of scavenging dust droplets and bacteria in the contaminated gas flow by the water droplets. At the same time, in the upper region of the tower, fine water droplets that rise together with the gas flow flowing upward from below are captured by coarse water droplets and allowed to settle downward by gravity. As a result, fine water droplets that tend to flow out of the tower downstream together with the airflow can be reliably removed from the airflow by the droplet removal means, and even higher dust removal and sterilization efficiency can be obtained. 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 this invention,
Identical parts 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 side is a nozzle that has a small diameter spray nozzle and sprays fine water droplet shower particles of around 200 μm, whereas the spray nozzle group 7a on the upper side sprays coarse water droplet particles around 500 μm in diameter. It consists of a nozzle set to generate. 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, water washing tower 5
On the exhaust side of the water washing tower 5, an eliminator 16 for removing water droplets is installed at the upper part 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 of the water washing tower 5, and an activated carbon filter for removing ozone from the gas. 1
8 is installed. Note that 19 is a filter for cleaning waste water that is installed in the drain pipe line. Next, the operation of the above configuration will be explained. During operation, ozone generated by the ozonizer 14 is turned into ozone bubbles C from the ozone supply nozzle 15 and is discharged and supplied into the cleaning water accumulated at the bottom of the cleaning tower 5. A part of the ozone is dissolved in the water and the rest is bubbles. It rises through the water and dissipates 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 rate control valve 11, and the lower region of the tower is showered with fine water droplets. Bb is dispersed and sprayed with a shower of coarse water droplets Ba in the upper region.
In this state, a flow of contaminated air containing dust and bacteria is extracted from a room (not shown) and is introduced from below into the interior space of the water washing tower 5 through the blower 3 and prefilter 4, and rises inside the tower as shown by arrow A. During this rising process, the ozone atmosphere inside the tower receives a sterilizing action, and the dust contained in the air flow is removed by convection contact with the atomized shower of water droplets.
Bacteria are collected and separated. 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, a shower of coarse water droplets is being sprayed above this area from the spray nozzle 7a on the upper stage side, and the fine water droplets that have taken in dust and bacteria that rise up in the tower with the airflow are coarse. The water is captured by the water droplets, sinks downward by gravity against the airflow A, and accumulates at the bottom of the tower. On the other hand, the airflow that has passed through the washing water spray shower area in 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. The water level of the washing water stored at the bottom of the washing tower 5 is constantly monitored, and when the water level in the tower falls below a predetermined water level, clean water is replenished through the water level control valve 13. According to the experimental results conducted by the present inventor to confirm the performance evaluation of the above-mentioned dust removal and sterilization equipment, the dust removal efficiency by particle size is 100% for particles of 2.0 μm or more, and 100% for particles of 1.0 μm or more.
99.8%, 98.7% for 0.5μm or more, 0.2μm or more
A good dust collection efficiency of 94.2% was obtained, and both the air flow purified through the illustrated device and the washing water accumulated in the washing tower were sufficiently sterilized by the sterilization effect of ozone. Confirmed.

【Effect of the invention】

As described above, according to the present invention, the spray nozzle is divided into upper and lower stages in a water washing tower, and sprays fine water droplets from the lower stage and coarse water droplets from the upper stage towards 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 compact configuration, it is possible to effectively separate and collect fine dust and bacteria contained in contaminated gas, resulting in high dust removal and sterilization efficiency, and at the same time, the sterilization effect of ozone Bacteria in the air flowing through the water washing tower as well as bacteria separated and collected within the tower can be sterilized, resulting in dust removal and
A sterilization device can be obtained.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of this invention;
The figure is a system diagram of a conventional general dust removal and sterilization device. In the figure, 2: gas circulation air passage, 3: blower, 5: water washing tower, 7a: spray nozzle for spraying coarse water droplets, 7b: spray nozzle for spraying fine water droplets, 14: ozonizer, 15: ozone supply Nozzle, 16: Eliminator for drip removal, 17: Drop removal cyclone, 18: Activated carbon filter for ozone removal, A: Contaminated air flow, Ba, Bb: Cleaning water spray shower, C: Ozone.

Claims (1)

[Claims] 1. Dust removal of gas, in which 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 separate and collect dust and bacteria from the gas and purify the contaminated gas. In the sterilization device, the cleaning water is divided into upper and lower stages in the water washing tower, and includes spray nozzles that spray fine water droplets from the lower stage and coarse water droplets from the upper stage toward the contaminated gas. It is configured to include a circulation supply system, 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. A gaseous dust removal and sterilization device featuring: