JP2001027421A - Offensive odor substance removing method for fan heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost by using an offensive odor substance removing method to expect the offensive odor substance removing performance similar to that of an offensive odor substance adsorbing body with the catalyst mixed therein even by an offensive odor substance adsorbing body formed of only the adsorbent. SOLUTION: In this method, an offensive odor substance adsorbing body 18 formed of an adsorbent is installed on a partition 16 to separate an air feed path 15 from an exhaust path 21. When the air is clean (not in combustion), the offensive odor substance in the air is adsorbed by the offensive odor substance adsorbing body 18 when the air is passed through the air feed path 15. In the combustion, the offensive odor adsorbing body 18 is heated by the exhaust gas, and the adsorbed offensive odor substance is desorbed, and the offensive odor substance is oxidation-decomposed when the substance is passed through a combustion burner 17 together with the air. After the adsorbent is recycled, the indoor air is circulated for deodorization without achieving the combustion again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for removing odorous substances for a fan heater.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of energy saving, houses with high heat insulation and confidentiality have been increasing, and the necessity of purifying indoor air has been increasing. Therefore, not only air purifiers but also existing electrical products have many products with air purifying function as an added value, and fan heaters with regenerative air purifying function have been developed. I have. The method is as follows. First, at the time of air cleaning (at the time of non-combustion), the fan 1 controls the outside air intake 2
More air is taken into the fan heater, and dust in the air is removed by the filter 3. The air from which dust has been removed passes through the air supply path 4, and passes through the combustion section inlet 5 and the combustion burner 6,
After the odor substance is adsorbed by the odor substance adsorbing body 9 including the oxidation catalyst provided near the exhaust port 8 through the exhaust path 7, the odor substance is discharged from the exhaust port 8 to the outside of the fan heater. next,
When the fan heater is operating (during combustion), air passes through the outside air intake 2, the filter 3, the air supply path 4, and the combustion section inlet 5,
The fuel is supplied to the combustion burner 6 and mixed with fuel gas to burn. The high-temperature combustion gas generated by the combustion passes through the exhaust path 7
Then, the odorant adsorbent 9 is heated. Thereby simultaneously odorant adsorbed is desorbed from the odorant adsorbent 9, change CO2, odorless substance, such as H ₂ O is oxidized and decomposed by the oxidation catalyst that is mixed in the odorant adsorbent 9, the exhaust Released through the mouth 8. Thus, the odorant adsorbent 9 is regenerated, and the odorant can be adsorbed again. The numbers in the above description are the same as those in FIG. 1 for explaining a comparative example in the embodiment of the present invention.

[0003] The air is cleaned by repeating odor adsorption and oxidative decomposition as described above.

[0004]

However, the conventional system has the following problems.

In order to efficiently oxidize and decompose odor components, a large amount of expensive noble metal-based catalyst must be used for the odor adsorbent. On the other hand, adsorbents such as zeolites are inexpensive, but odorous substances composed only of adsorbents cannot oxidize and decompose odorous substances. It gives off a bad smell.

In view of the above problems of the conventional system, the present invention can be expected to have the same odor substance removal performance as that of an odor substance adsorbent containing a catalyst even with an odor substance adsorbent containing only an adsorbent.
An object of the present invention is to provide a method for removing an odorant for a fan heater that can greatly contribute to cost reduction.

[0007]

According to the present invention, first, an odorant adsorbent is installed on an air path partition plate that separates an air supply path and an exhaust path of a fan heater, and air is supplied from an outside air intake when non-combustion is performed. The air is taken into the fan heater, passed through the air supply path, adsorbed by the odor substance in the air to the odor substance adsorbent, deodorized, and then discharged from the exhaust port. Next, during combustion,
When the odor substance adsorbent is heated by the combustion heat, the odor substance adsorbed on the odor substance adsorbent is desorbed. afterwards,
The desorbed odorant passes through a combustion section inlet and a combustion air intake together with air, is oxidized and decomposed by a flame when passing through a combustion burner, and is discharged from an exhaust port through an exhaust path. In this way, the odorant adsorbent is regenerated,
The odorous substance is adsorbed again during non-combustion to deodorize. With the odor substance removal method according to the above process, generation of an unusual odor during regeneration of the odor substance adsorbent can be prevented without using a noble metal catalyst.

More specifically, an odorant adsorbent made of an adsorbent is installed on an air path partition plate that separates an air supply path and an exhaust path of a fan heater. When the air is cleaned (when not burning), air is taken into the fan heater from the outside air intake by the fan. After the taken-in air passes through the air supply path after the dust in the air is removed by the filter, the odor substance is adsorbed by the odor substance adsorbent. The air to which the odorous substances are adsorbed passes through the inlet of the combustion section, enters the exhaust path from the intake air for combustion, and is discharged from the exhaust port to the outside of the fan heater. Thus, the indoor air is cleaned. Next, when the fan heater is operated (during combustion), the odorant adsorbent is heated by the exhaust gas, the temperature rises, and the odorant adsorbed on the adsorbent is desorbed. The desorbed odorant enters the combustion air intake through the combustion section inlet together with the air, and is oxidized and decomposed by the flame when passing through the combustion burner. Then, it is discharged from the exhaust port through the exhaust path. After regenerating the adsorbent in this way,
Without burning again, the indoor air is circulated to deodorize.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. First, fan heater air supply path 1
The odorant adsorbent 18 made of an adsorbent is installed on an air path partition plate 16 that separates the exhaust path 5 from the exhaust path 21. that time,
It is important to install as close to the combustion burner 17 as possible. As the shape of the odorant adsorbent 18, a metal plate coated with an adsorbent at least on the air supply path 15 side is used. The metal plate preferably has a high thermal conductivity so that heat is easily transmitted, and is as thin as possible. It should be noted that by molding into a corrugated shape, a mold shape or the like, the contact surface with air is enlarged, which is effective for odor substance adsorption. It is also possible to apply the adsorbent directly to the air path partition plate 16.

During air cleaning (non-combustion), the fan 12
As a result, air is taken into the fan heater from the outside air intake 13. After the taken-in air passes through the air supply path 15 after the dust in the air is removed by the filter 14, the odor substance is adsorbed by the odor substance adsorbent 18. The air adsorbed with the odorous substance passes through the combustion section inlet 19, enters the exhaust path 21 from the combustion air intake 20, and is discharged from the exhaust port 22 to the outside of the fan heater. This removes odor substances in the room.

Next, when the fan heater is operating (during combustion),
The exhaust gas heats the exhaust path 21 side of the odorant adsorbent 18, and the temperature also increases on the air supply path 15 side due to heat conduction. Thus, the odorous substance adsorbed on the adsorbent on the air supply path 15 side is desorbed. The deodorized odorant passes through the combustion section inlet 19 together with the air and enters the combustion air intake 20. Then, when passing through the combustion burner 17, the odorous substance is oxidized and decomposed by the flame, changes into an odorless substance such as CO 2, H ₂ O, etc., and is discharged from the exhaust port 22 through the exhaust path 21 as it is. After the regeneration of the adsorbent in this way, the room air is circulated and deodorized without burning again.

[0012]

EXAMPLES An evaluation test for deodorization was carried out using the present invention. First, a corrosion-resistant stainless steel plate containing Mo having an adsorbent application portion of 5 cm × 27.5 cm and a thickness of 0.6 mm was processed so that it could be fixed inside the fan heater.
I prepared it.

Next, an adsorbent slurry in which an adsorbent containing Na-ZSM-5 and Cu ion-exchanged A-type zeolite is dispersed in water together with silica sol, and a catalyst slurry prepared by dispersing electrolytic manganese dioxide in silica sol and water are used. The mixture was mixed, and a total of 5 g was supported on both surfaces of the first stainless steel plate by a spray method. This was designated as odorant adsorbent A. on the other hand,
A total of 5 g of the adsorbent slurry alone was carried on one surface of a second stainless plate by a spray method, and this was used as an odorant adsorbent B. Thus, two types of odorant adsorbents were prepared.

Next, two gas fan heaters are prepared and, as shown in FIG. 1, an odorant adsorbent A is installed parallel to the hot air flow direction as indicated by reference numeral 9 near the exhaust port 8. Heater A was used. Further, as shown in FIG. 2, a fan heater B was prepared by installing the odorant adsorbent B on the air path partition plate 16 with the surface coated with the adsorbent facing the air supply path 15 side. At this time, in order to easily transfer the heat of the combustion burner to the odorant adsorbing body when the fan heater is burning, the combustion burner is installed as close to the combustion burner as possible. The odorant adsorbent B is shown at 18.

Using these two fan heaters, the deodorizing performance of the odor adsorbent was compared. Evaluation of deodorizing performance is 1
A fan heater is installed in a cubic meter acrylic box, the lid is closed, and the mainstream smoke (smoke that has passed the cigarette filter) for five cigarettes is introduced into the lid, and ammonia is detected using a detector tube and gas chromatograph. , Acetic acid, and acetaldehyde concentrations were determined and used as initial concentrations. The concentrations of ammonia, acetic acid and acetaldehyde were 27
ppm, 6 ppm, and 10 ppm. After that, rotate the fan of the fan heater, and without burning,
Drived. After 30 minutes of operation, the fan heater was stopped, and the concentrations of ammonia, acetic acid, and acetaldehyde were checked again.
The removal rate was determined from the comparison with the initial concentration. As a result, as shown in Table 1 for the first time, it was found that the fan heaters A and B had substantially the same deodorizing performance.

[0016]

[Table 1] Next, sensory evaluation was performed to compare the odor intensity generated when the odor adsorbent of the fan heater was regenerated.

First, as a real space, the fan heater A after the adsorption test was installed at the position 12 in the laboratory shown in FIG. 4 and burned for 30 minutes to regenerate the odorant adsorbent. During the combustion, the air in the room was stirred by the stirring fan 13 in order to make the odor discharged from the fan heater A uniform, and the fan was continuously operated for 5 minutes after the combustion was completed. Thereafter, the subject was asked to enter the room, and a report of odor sensation was made using a six-level odor intensity evaluation scale published by the Environment Agency shown in (Table 2). The subjects were asked to enter up to four persons at a time, as in 14, and to report the odor sensation immediately after entering, assuming that they entered and exited the living room of the house. The same sensory evaluation was performed for fan heater B.

As subjects of the experiment, a total of twelve males and six females determined to have normal olfaction by a T & T olfactometer were employed. The declaration is
I had two to four times per person. The total number of filers was 40.

[0019]

[Table 2] The results are shown in (Table 3).

[0020]

[Table 3] As shown in (Table 3), 57.5% of the test subjects who reported "odor that can be easily perceived" to the odor generated at the time of regeneration of the odorant adsorbent were regenerated in fan heater A, and 60% in fan heater B.
%, Which was very close to the above, and it was found that there was almost no difference.

Finally, in order to confirm the regeneration of the odorant adsorbent, the odorant adsorption performance after the regeneration was examined. For the deodorization test, the above cigarette odor deodorization test was performed. As a result, as shown in Table 1 after the regeneration, the initial adsorption characteristics were restored. This shows that the adsorption characteristics of the odorant adsorbent can be regenerated by this method.

From the above results, the odorant adsorbent in which the catalyst is mixed in the adsorbent and the odorant adsorbent containing only the adsorbent have the odorant adsorption performance, the odor generation level at the time of regeneration, the odorant adsorbent regeneration, The ability is almost the same.

[0023]

As described above, by using the method for removing an odorant for a fan heater according to the present invention, even an odorant adsorbent comprising only an adsorbent has the same odor substance removal performance as an odorant adsorbent containing a catalyst. It can be expected and can greatly contribute to cost reduction.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fan heater using an odor adsorbent A for comparison with the embodiment of the present invention.

FIG. 2 is a cross-sectional view of an odor adsorbent A used in one embodiment of the present invention.

FIG. 3 is a laboratory used in a sensory test according to one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fan 2 outside air intake port 3 filter 4 air supply path 5 combustion section inlet 6 combustion burner 7 exhaust path 8 exhaust port 9 odorant adsorbent 10 air path partition plate 11 microcomputer control part 12 fan 13 outside air intake port 14 filter 15 intake path Reference Signs List 16 air path partition plate 17 combustion burner 18 odorant adsorbent 19 combustion section inlet 20 combustion air intake 21 exhaust path 22 exhaust port 27 microcomputer control part 23 fan heater 24 stirring fan 25 subject evaluation position 26 entrance

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masato Hosaka 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 3L028 AA02 AB03 AC01 AC06 3L037 BB10 3L072 AA05 AB10 AC01 AD19

Claims (1)

[Claims] 1. An outside air intake port, an air supply path that is a passage for air taken in from the outside air intake port, an exhaust path that is an exhaust path, and an air path that separates the air supply path from the exhaust path. In a method for removing odorous substances from a fan heater having a partition plate, a combustion air intake port, a combustion burner, and an exhaust port, an odorant adsorbent is installed on the air path partition plate. The air is taken into the fan heater from the outside air intake, passed through the air supply path, the odorous substance in the air is adsorbed by the odorant adsorbent, and then discharged from the exhaust port through the exhaust path. By heating the odorant adsorbent with combustion heat, the odorant adsorbed on the odorant adsorbent is desorbed, and the desorbed odorant is passed through the combustion air intake, After oxidative degradation when passing the serial combustion burner, odorant removal method fan heater, characterized in that to release from the exhaust port through the exhaust path.