JP2003172534A - Water-screen hood - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently purify exhaust gas. <P>SOLUTION: A water screen is formed on the surface of a hood which introduces exhaust gas from an exhaust gas source into a exhaust duct, and electric discharge is generated in opposition thereto. Suspended particulates and offensive odor gas components contained in the exhaust gas are removed, while avoiding fire risk in a saved space, and so the exhaust gas is purified. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for purifying polluted gas containing fine particles such as oil enemies generated from a stove or an oven in a kitchen before being discharged to the outside.

[0002]

2. Description of the Related Art Conventionally, a hood has been used to introduce pollutant gas into an exhaust duct, and before exhausting from the duct to the outside, the pollutant gas is purified using a dust collector or the like before exhausting.

In order to protect the atmospheric environment, it is preferable that the polluted gas is exhausted to the outside after removing fine particles and malodorous components.

[0003]

However, there are many problems in the place where the dust collector is installed, and it is often difficult to secure a space in which a dust collector having sufficient performance can be installed. In addition, it is often more difficult in terms of space and cost to install a device for removing malodorous gas in addition to the dust collector, and very few cases are actually performed.

According to the present invention, a hood for introducing gas when exhausting gas from a pollutant gas source such as a kitchen is provided with a dust collecting function and a malodorous gas removing function. An object is to provide an apparatus capable of purifying gas.

[0005]

In order to achieve the above object, the invention according to claim 1 forms a water film on a hood for introducing a pollutant gas, and relatively collides with the water film by inertial force. It collects fine particles having a particle size and absorbs soluble malodorous gas components that reach the water film by diffusion.

As a result, according to the first aspect of the present invention, it is possible to remove relatively large-sized fine particles and soluble malodorous gas from the exhaust gas and reduce environmental pollution to the surroundings. Also, even when used as a high-heat exhaust gas generation source such as a stove, a fire can be suppressed because a water film is formed.

Further, in the invention according to claim 2, the fine particles contained in the exhaust gas are electrified by electric discharge to perform electrostatic collection, and it is possible to collect even fine particles with high efficiency. Further, since the fine particles once reaching the water film can be reliably collected without re-scattering, the dust collection efficiency can be increased. Furthermore, since the ion wind is generated along with the occurrence of the discharge and the gas is stirred, the soluble malodorous gas component can be absorbed in the water film with high efficiency.

As a result, according to the second aspect of the invention, the hood can be provided with an exhaust gas purification performance that is extremely highly efficient as compared with the case where no discharge is used.

Further, the invention according to claim 3 uses mist-like water drops to form a water film, and the mist-like water drops are collected by the hood to form a water film.

As a result, in the invention according to claim 3, since the water droplets absorb the malodorous gas component and then are collected as dust, the efficiency of removing the malodorous gas can be increased. Further, the pipe for supplying water can be omitted.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a water film hood according to the present invention will be described below with reference to the accompanying drawings.
The water film hood according to the present invention is not limited to this embodiment.

(Description of Configuration of Embodiment) FIG. 1 shows a first embodiment of a water film hood according to the present invention.

In the figure, reference numeral 1 is a hood plate in this embodiment. The upper part of the hood plate is connected to the exhaust duct 2, and the water supply nozzle 3 for forming a water film is arranged on the upper part of the above-mentioned 1. By supplying water from the pre-water supply nozzle 3 to the hood plate 1, a water film is formed on the surface of the hood plate 1. At the bottom of the hood plate 1, there is a water sump 4 for collecting water, and the water dropped to the bottom is drained from the water sump 4.

In the water film type hood, drainage is passed through an oil separator 5 and a filter 6, and then is supplied to an upper water supply nozzle 3 by a pump 7 to circulate and use the water.

In the water film hood, the water used may be drained from the sump 4 without recirculation.

FIG. 2 shows Embodiment 2 of the water film hood according to the present invention. In the second embodiment, the discharge electrode 8 is installed above the hood so as to face the water film. A direct current, an alternating current, or a pulsed high voltage is applied to this discharge electrode to generate a discharge. When a discharge is generated, the fine particles contained in the exhaust gas are charged and electrostatically collected.

FIG. 3 shows a third embodiment. Embodiment 3
Then, in order to form a water film, for example, an ultrasonic mist generator 9 or a mist generating nozzle is used to generate fine water droplets, which are mixed with the exhaust gas and supplied. Water droplets are collected by the electric dust collection action on the upper part of the hood to form a water film.

(Description of Operation of First Embodiment) In the first embodiment, the exhaust gas is introduced into the exhaust duct along the water film hood. At this time, the relatively large particle size particles contained in the exhaust gas collide with the water film due to inertial force and are collected. In addition, the soluble malodorous gas is absorbed and removed by the water film by diffusion.

In the second embodiment of the water film type hood, the discharge electrode 8 is installed on the upper part of the hood so as to face the water film. A direct current, an alternating current, or a pulsed high voltage is applied to this discharge electrode to generate a discharge. When a discharge is generated,
The fine particles contained in the exhaust gas are charged and electrostatically collected. Therefore, high dust collection efficiency can be obtained even for fine suspended particles.

In the second embodiment, ionic wind is also generated along with the occurrence of discharge. Therefore, the stirring of the gas passing between the electrodes is promoted, and the soluble malodorous gas component is efficiently absorbed and removed by the water film.

In the second embodiment, the discharge can be generated by applying an alternating current or a pulse voltage. In any case, since highly reactive radicals are efficiently generated, the malodorous gas component is also removed by the radical reaction.

In the third embodiment, fine mist is carried together with the exhaust gas. At this time, the malodorous gas component soluble in the fine mist is absorbed. Since the mist is collected by the hood plate in the electric dust collecting section above the hood, the malodorous gas component in the exhaust gas can be efficiently removed. Further, a water film is formed by collecting the mist.

(Description of Effect of First Embodiment) In the first embodiment, when the exhaust gas flow from the pollution source collides with the water film type hood and starts moving in parallel with the hood, the direction of the air flow changes. As a result, the relatively large particle size particles contained in the exhaust gas are subjected to inertial force and collide with the water film to collect dust. In addition, the soluble malodorous gas is absorbed and removed by the water film by diffusion. For this reason, exhaust gas can be purified in a small space, and environmental pollution to the surroundings can be reduced. Also, even when used as a high-heat exhaust gas generation source such as a stove, a fire can be suppressed because a water film is formed.

(Explanation of Effect of Second Embodiment) In the second embodiment of the water film type hood shown in FIG.
A discharge electrode 8 is installed so as to face the water film. When a direct current, an alternating current, or a pulsed high voltage is applied to this discharge electrode, a discharge is generated, and the fine particles contained in the exhaust gas are charged and electrostatically collected. At this time, in the dry type electrostatic precipitator, conductive carbon dust or the like is difficult to collect due to an abnormal re-scattering phenomenon, but in the second embodiment, since the water film is used, it is once collected by the collecting electrode. There is no protrusion of fine particles, and abnormal re-scattering phenomenon can be suppressed. Therefore, high dust collection efficiency can be obtained even for conductive fine suspended particles.

In the second embodiment, the ions move in the space in accordance with the occurrence of the electric discharge, so that they collide with the gas molecules of the Middle Ages to generate the ion wind. The ionic wind greatly promotes the stirring of the gas passing between the electrodes, and the soluble malodorous gas component is efficiently absorbed and removed by the water film.

In the second embodiment, discharge can be generated by applying an alternating current or a pulse voltage. In any case including the case of direct current, oxygen molecules and water molecules contained in the exhaust gas are dissociated with the occurrence of discharge, and highly reactive radicals are efficiently generated. Odorous gas components are generally oxidized by radical chemical reactions. Acetic acid and the like are known as one of typical reaction products. For this reason, it is often converted into a water-soluble substance after the chemical reaction, and the plasma chemical reaction is also effective for removing the malodorous gas component.

(Explanation of Effect of Third Embodiment) In the third embodiment shown in FIG. 3, fine mist is generated by using an ultrasonic mist generator or a mist generating nozzle and mixed with exhaust gas. This mist is carried with the exhaust gas. At this time, the malodorous gas component soluble in the fine mist is absorbed. Since the mist is collected by the hood plate in the electric dust collecting section above the hood, the malodorous gas component in the exhaust gas can be efficiently removed. Further, a water film is formed by collecting the mist.

【The invention's effect】

As is clear from the above, the water film hood according to the present invention forms a water film on the hood for introducing exhaust gas into the exhaust duct, and the water film absorbs suspended fine particles and malodorous gas components. Then, the exhaust gas is purified.

Further, in the apparatus according to the second aspect of the present invention, discharge is generated by the discharge electrode installed on the upper part of the hood, and the fine particles are collected in the water film by the electric dust collection, and the discharge is generated. It is possible to absorb and remove soluble malodorous gas components by the stirring action of ionic wind. Further, in many cases, an insoluble malodorous gas component is changed to soluble by a radical chemical reaction generated by discharge, and when this reaction occurs, it can be absorbed and removed by a water film. Therefore, it is possible to highly efficiently purify the gas by generating the discharge through the water film.

Further, as shown in the third embodiment, the absorption of soluble malodorous gas components can be promoted by supplying fine water droplets into the exhaust gas, so that the gas purification efficiency can be increased.

According to the present invention, since the hood for introducing the gas is conventionally provided with the gas purifying function, a new space for installing the gas purifying device is not required, and the exhaust gas purifying device is space-saving.

Further, since the water film is formed, it is possible to suppress the occurrence of fire and to provide a highly safe gas purification apparatus.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an outline showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an outline showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of an outline showing a third embodiment of the present invention.

[Explanation of symbols]

1, hood board 2 exhaust duct 3 Water film forming nozzle 4 water sump 5 oil separator 6 filters 7 pump 7 8 discharge electrodes 9 Ultrasonic mist generator 10 Mist generation nozzle

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshihiro Ozawa             77 Higashimachi Fujitsuka, Iwakura City, Aichi Prefecture Aikoku Machinery Co., Ltd.             Inside the company (72) Inventor Akira Mizuno             1-2-4 Kanayama, Naka-ku, Nagoya City, Aichi Prefecture             (Urban Raffle Kanayama No. 1202) F term (reference) 3B117 AA08 BA02 BA44 BA51                 3L058 BH10 BK05 BK06

Claims (3)

[Claims] 1. A hood for enclosing a pollutant gas source, comprising:
A hood characterized by supplying water from its upper part to form a water film on the surface of the hood. 2. A hood provided with a discharge electrode facing the water film in the hood and having a function of charging and collecting fine particles in passing air. 3. A water film type hood, wherein a water film is formed by supplying atomized water drops and collecting the water drops.