JPS602570B2 - Electric hot air fan with air purifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric hot air fan with an air purifier, and its purpose is to eliminate nitrogen dioxide (N02) and carbon monoxide (carbon monoxide), which exist in the air and are harmful to the human body. By installing a filter in the air flow path of the electric hot air fan that efficiently removes CO) at room temperature, the electric hot air fan has an improved air purification function when used not only as a high temperature hot air fan but also as a normal temperature fan. This is what we are trying to provide.

Large amounts of N02 and CO are generated by combustion in internal combustion engines such as automobiles, large boilers, oil stoves, etc., and if inhaled in large quantities, there is a risk of damage to the lungs and central nervous system and ultimately death.

BACKGROUND ART Conventionally, air purifying devices have generally been air purifiers with dust collectors or devices in which air conditioners such as air conditioners are equipped with pre-filters or activated carbon filters for dust collection.

However, since these devices are expensive and large, they have not been widely used, and there has been a desire to develop a smaller, more easily portable type of air purifying device at a lower price. In addition, as an air purifying filter, it is not only a pre-filter that collects floating dust in the air, but also a pre-filter that collects harmful gases such as N0.
A filter that removes 2 and CO was also desired. Activated carbon is a filter that removes NQ, but its removal capacity is small, so it may reach the end of its life quickly, or it may not be able to remove N02 at high temperatures.
There were problems such as reduction to O and desorption of adsorbed N02 depending on operating conditions. On the other hand, as filters for removing CO, there are metal oxide catalysts such as hobcalite and noble metal catalysts in which precious metals are supported on a lossy body such as alumina.
Metal oxide catalysts can oxidize and remove CO even at low temperatures, but they have the disadvantage that their activity decreases in the presence of moisture.
Furthermore, noble metal catalysts have the disadvantage that they only exhibit their activity at high temperatures. The present invention solves the above-mentioned conventional drawbacks and can be used for other purposes, especially as a circulator, at room temperature.
This electric warm air fan is designed to have a remarkable air purifying effect even when used, and will be described in detail below according to examples.

FIG. 1 is a cross-sectional view of an electric air heater with an air purifier to which the present invention is applied, in which 1 is an air passage, 2 is a blower, 3 is a heat generating part, 4 is a filter using activated carbon 1, and 5 6 is a filter using a CO oxidation catalyst, and 7 is an air outlet.

There is a concern that the CO oxidation catalyst may be poisoned by harmful gases in the air or by the melon, so it was installed downstream of the activated carbon and N02 remover to prevent poisoning. The CO oxidation catalyst has the property that its reactivity increases as the temperature increases, so activated carbon, NO
2 filter using removal agent and CO oxidation catalyst 4, 5,
The installation location must be selected so that heat radiation from the heat generating portion 3 can be effectively obtained for each of the heat generating portions 6. However, 100
Since it is unstable above 0:00, it is best to use it below 100:00. The above-mentioned NQ remover is a hybrid molded product (0) of alkali, cement material, and powdered activated carbon, and the alkalis include NaOH, KOH, Ca(OH)2, Mg(
OH)2, K2C03, Na2C03, Na2S20
3. Na2S03 is suitable, and suitable cement materials include pentonite, diatomite, alumina cement, alumina sol, silica sol, clay, calcined stone pipe, Bortland cement, kaolin, water glass, etc.

However, in particular, potassium carbonate and calcium hydroxide are used as alkalis, and baked stone pipes (CaS04,
The one using Group 1'20) removed N02 with high performance. It is thought that the powdered activated carbon plays a role in increasing the area of the kneaded molded product and promoting the reaction between the alkali and N02. It is thought that the kneaded molded product and N02 react as described below to remove N02 from the air. 2N0
20K2C03→KN030KN020C024N02
Tenth a(OH)2 One Ca(N03)2 Tenth Ca(N0
2) 2 Ten is 20, but it does not react with NO.

The composition of the kneaded molded product is potassium carbonate: calcium hydroxide: baked stone tube (CaS04・1'240): powdered activated carbon=
The mixture was kneaded and molded with water at a ratio of 3:3:2:2 (weight ratio), and then dried.

The CO oxidation catalyst is a catalyst (m) in which one or more selected from platinum, rhodium, and ruthenium and palladium are simultaneously supported or palladium alone is supported on a carrier made by kneading and molding an alkali, cement material, and powdered activated carbon.

The procedure for this catalyst carrier was optimized so that the supported substance was supported uniformly over a wide range with a fine particle size, and the specific surface area of the carrier was large and the strength was high. When supporting noble metals, alkali is thought to change the pH of the impregnating solution in which noble metal chloride is dissolved to alkaline, thereby helping the noble metals to be adsorbed onto the carrier in a fine and uniformly dispersed state. It is thought that the powdered activated carbon contributes to the porous physical properties of the carrier, such as increasing the specific surface area of the carrier. It is believed that the cement material increases the strength of the carrier and also contributes to improving its heat resistance and abrasion resistance. Examples of alkalis include potassium carbonate, potassium hydroxide, and calcium hydroxide, but potassium carbonate was the most suitable in terms of ease of use and performance.Cement materials include Bortland cement, calcined stone, bentonite, and lime aluminate. Although alumina cement as a main component can be cited, alumina cement was the most suitable in terms of performance.The reason is thought to be the effect of the promoter effect of ferric oxide and calcium oxide contained in alumina cement. It is also assumed that alumina as a binder plays a role in forming a stable support.Precious metals such as platinum, rhodium, ruthenium, and palladium were used as support materials.Palladium, which is relatively inexpensive, may be used alone or in other forms. The combination of platinum and palladium produced a highly active catalyst, and the combination of platinum and palladium produced a synergistic effect, resulting in significant oxidation activity.Therefore, filter 6 using a CO oxidation catalyst has potassium carbonate as a highly active catalyst. It is desirable to use a kneaded molded product of lime aluminate and powdered activated carbon in which platinum and palladium are supported at the same time.The method for preparing this catalyst is as follows: potassium carbonate is used as the alkali,
Alumina cement is used as the cement material, potassium carbonate has a particle size of 100 mesh, powdered activated carbon has a particle size of 300 mesh, and alumina cement has a composition of 45% or more alumina and 10% or less ferric oxide. It was used. The carrier contains 1 part of potassium carbonate, 3 parts of powdered activated carbon, 6 parts of aluminate lime, and 0.0 parts of sodium carboxymethyl cellulose (CMC) as a binder.
5 parts were added and kneaded and molded with water. The kneaded material was thoroughly dried and then classified into 8 to 20 mesh to obtain a carrier.
After the carrier was sufficiently dried, it was immersed in a solution containing palladium and platinum to effect adsorption. The amounts of palladium and platinum were adjusted so that 0.3 W% of each was adsorbed on the carrier. The adsorbed carrier was reduced with sodium borohydride and thoroughly dried to obtain a catalyst. In the present invention, as described above, the activated carbon, N02 remover, or CO oxidation catalyst layer constituting the filter is provided in the air passage of the electric hot air fan, so the following effects were obtained. The figure shows a 6-tatami room (indoor volume) with a ventilation frequency of 1.2 times/hr. 29.6)
It represents the N02 concentration and CO concentration when tested in a room with Electric hot air fan with air purifier has a flow rate of 4.0 w/
The structure of the filter consisted of a granular activated carbon filter 4, an N02 remover filter 5, and a CO oxidation catalyst layer filter 6 from the front, and each layer had a thickness of 3 and a filter area of 20×10 layers. The filter was installed so that when the heat generating part 3 generated heat, the temperature was 8000 or less. The measurement was performed by simultaneously injecting N02 and CO into indoor air with a humidity of 62% and a humidity of 25 qo. The O-legs and CO concentration were set to willow, a hot air fan was operated, and the concentration attenuation was measured using a non-dispersive infrared CO analyzer and a chemiluminescent N○× analyzer. As a result, as shown in Figures 2 and 3, when the present invention is used, N02 is rapidly removed with high performance and becomes close to 0 within about 30 minutes, and CO is also reduced within 30 minutes. It was confirmed that there was a rapid decrease in As described above, the present invention makes it possible to efficiently purify N02 and CO generated from gas stoves, kerosene stoves, etc. in the home, and to create a state with less harmful gases.

Therefore, by using the electric warm air fan with air purifier of the present invention, even in urban areas or near expressway toll collection offices where N02 and CO concentrations are high, it is possible to live in conditions with low N02 and CO concentrations, especially When an electric hot air fan is used as a circulator at room temperature, it also has an air purifying function, so it can be expected to be very effective. In addition, when using a hot air blower, the CO oxidation catalyst layer is exposed to hot air, so the gas weakly adsorbed on the catalyst surface is easily desorbed, which has the effect of preventing the effects of poisoning from gases present in the air. be.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an electric temperature machine with an air purifier, Fig. 2 is a change in N02 concentration comparing the present invention and a conventional example, and Fig. 3 is a similar change in CG agricultural rate. 1...Air passage, 2...Blower, 3...Heating part 4, 5, 6...Filter. Fig. 1 Fig. 2 Fig. 3

Claims (1)

[Claims] 1. In the air passage of an electric hot air fan having a heat generating part and a blower,
An electric hot air fan with an air purifier, characterized in that a filter consisting of one or more selected from the following (I) and (II) and (III) at the same time or only (III) is installed. (I) Activated carbon (II) A kneaded molded product of alkali, cement material, and powdered activated carbon (III) One or more selected from platinum, rhodium, and ruthenium and palladium are simultaneously added to a carrier obtained by kneading and molding alkali, cement material, and powdered activated carbon, Alternatively, catalyst 2 supported on palladium alone In (II) constituting the filter, potassium carbonate and calcium hydroxide are used as the alkali, and calcined gypsum (CaSO_4.1/2H) is used as the cement material.
_2O) The electric hot air fan with an air purifier according to claim 1. 3. The electric warm air fan with an air purifier according to claim 1, wherein in (III) constituting the filter, potassium carbonate is used as the alkali and lime aluminate is used as the cement material. 4. The electric warm air fan with an air purifier according to claim 1, wherein in (III) constituting the filter, a catalyst on which platinum and palladium are simultaneously supported is used. 6. The electric warm air fan with an air purifier according to claim 1, wherein (III) constituting the filter is installed downstream of the air flow path.