JP2002039581A - Deodorizing control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deodorizing control system which can set odorous material to be within a reference value and also reduce the running cost, in ventilating the interior of a room. SOLUTION: In a ventilating system which leads outside air OA into the room 10 of a cleaning establishment, an eating house, or the like, and exhausts the indoor air to the atmosphere, a part of the indoor air exhausted is supplied to a semiconductor system of odor sensor 19 at each fixed time interval, and the power of odor is monitored. In the interval of monitoring odor, a sensor is provided with odorless air which has passed an activated carbon vessel 21, thereby performing ventilation cleaning. When the power of odor monitored with the semiconductor system of odor sensor 19 amounts to a prescribed value or more, the indoor air is exhausted through an adsorptive material container 23. When the above semiconductor system of odor sensor 19 detects the power of the odor of the indoor air to be exhausted falling under the specified value, the indoor air is exhausted as it is to the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing control system for ventilating a room such as a restaurant or a hospital.

[0002]

2. Description of the Related Art Conventionally, when ventilating a room such as a restaurant or a hospital, it is necessary to take measures against odors in the exhausted air so as not to inconvenience nearby residents.

[0003] As shown in Table 1, six odor intensity display methods are defined for the odor as a measure of the odor intensity.

[0004]

[Table 1]

[0005] The relationship between the odor intensity and the odor concentration of 22 odor substances regulated by the Odor Control Law is defined as shown in Table 2 using a six-step odor display method.

[0006]

[Table 2]

[0007] As the regulation standard value of the offensive odor substance, the standard regulation value of most prefectures is as follows.

[0008] Ordinary houses… Odor intensity 2.5 or less Industrial area… Odor intensity 3.5 or less Other intermediate areas… Odor intensity 3.0 or less

[0009]

However, if the ventilation is continuously operated for 24 hours and the exhaust gas is deodorized by the deodorizing device, the operation cost becomes enormous and the deodorant must be replaced frequently, resulting in cost reduction. There are growing problems.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a deodorizing control system which can keep odorous substances within a reference value and reduce operating costs when ventilating a room.

[0011]

In order to achieve the above object, the invention of claim 1 is directed to a ventilation system for introducing outside air into a room such as a cleaning establishment or a restaurant and exhausting the room air to the atmosphere. A part of the room air to be exhausted is supplied to the semiconductor type odor sensor at regular intervals to monitor the intensity of the odor, and at intervals during the monitoring,
The sensor unit is supplied with odorless air through an activated carbon tank to perform aeration cleaning, and when the intensity of the odor monitored by the semiconductor type odor sensor becomes a predetermined value or more, the room air is exhausted through the adsorbent tank, and This is a deodorization control system which is a semiconductor type odor sensor, wherein when the odor intensity of the room air to be exhausted falls below a predetermined value, the room air is exhausted to the atmosphere as it is.

According to a second aspect of the present invention, air in a room such as a hospital or a nursing home is circulated by an air conditioner while air is circulated, and a part of the outside air is introduced into the air conditioner and blown into the room together with the circulating air. In an air-conditioning ventilation system that exhausts part of the indoor air to the outside air, a part of the indoor air circulated to the indoor unit is supplied to the semiconductor odor sensor at regular intervals, and the intensity of the odor is monitored. At intervals during monitoring, odorless air is supplied to the sensor unit through an activated carbon tank to perform aeration cleaning, and when the intensity of the odor monitored by the semiconductor type odor sensor becomes a predetermined value or more, the air in the circulating chamber is discharged. The air is supplied to the air conditioner through the adsorbent tank, and when the odor of the air in the circulating chamber falls below a predetermined value by the semiconductor odor sensor, the circulating air is circulated to the air conditioner as it is and a part of the air is exhausted to the atmosphere. A deodorizing control system so as to.

According to a third aspect of the present invention, a part of the air deodorized through the adsorbent tank is introduced into the semiconductor type odor sensor, and the odor is monitored to detect the life of the adsorbent.
It is a deodorization control system of the description.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a deodorizing control system in a room such as a cleaning establishment or a restaurant.

FIG. 1 shows a deodorizing system for ventilating a room 11 of a building 10 such as a cleaning establishment or a restaurant.

The building 10 is provided with an outside air OA inlet 12 and an exhaust port 13. The outside air OA is introduced into the room 11 by connecting the inlet 12 and the ceiling 14 of the room 11. Air supply fan 1
6 is connected.

An exhaust duct 17 is provided connecting the ceiling 14 of the room 11 and the exhaust port 13, and an exhaust fan 18 is connected to the exhaust duct 17.

The exhaust duct 17 on the upstream side of the exhaust fan 18
Is a semiconductor-type odor sensor 1
9 and a bypass duct 20 returning to the exhaust duct 17.

The bypass duct 20 includes a three-way cleaning valve 22 for introducing cleaning air CA from an activated carbon tank 21 and a duct 24 for introducing a part of air from an adsorbent tank 23 described later.
A three-way monitoring valve 25 for switching between the side and the semiconductor type odor sensor 19 is connected.

The downstream duct 17 of the exhaust fan 18 has
A deodorizing duct 26 for flowing exhaust air from the room 10 to the adsorbent tank 23 in parallel with the duct 17 is connected.

The deodorizing duct 26 on the upstream side of the adsorbent tank 23
Is connected to a deodorizing electric damper 27 for introducing room air from the exhaust duct 17.
An exhaust electric damper 28 and a flow rate adjusting damper 29 are connected to the exhaust duct 17 to which the exhaust gas 6 is connected.

The deodorizing duct 26 on the downstream side of the adsorbent tank 23
Is connected to a duct 24 for supplying air passing through the adsorbent tank 23 to the semiconductor odor sensor 19 via a three-way valve 25 for monitoring.

The detection value of the semiconductor type odor sensor 19 is input to the control device 30. The control device 30 includes a cleaning three-way valve 22, a monitoring three-way valve 25, and a deodorizing electric damper 2.
7. The exhaust electric dampers 28 are respectively controlled.

As shown in FIG. 3, the semiconductor type odor sensor 19
Is provided with a platinum thin film heater 32 on the lower surface of an alumina substrate 31, a platinum thin film electrode 33 on the upper surface, and Zn on the upper surface thereof.
It has a structure in which a metal oxide semiconductor film 34 of O or the like is formed. When odor molecules are adsorbed on the surface of the metal oxide semiconductor film 34, the resistance value of the metal oxide semiconductor film 34 decreases according to the concentration. Utilizing this fact, the change in the resistance value is detected as a voltage change by making it equal to the load resistance, and this is displayed in a unitless manner from 0 to 10.

Normally, the main component of the odor gas constituting the garbage odor is hydrogen sulfide gas. Therefore, the calibration and the characteristic evaluation of the semiconductor type odor sensor 19 were performed using hydrogen sulfide gas.

FIG. 4 shows the relationship between the odor monitor instruction value of the semiconductor type odor sensor 31 and the odor intensity when the hydrogen sulfide gas concentration is changed.

Table 3 shows the relationship between the odor monitor instruction value, the odor concentration, and the odor index for hydrogen sulfide gas with reference to FIG.
It was shown to.

[0029]

[Table 3]

In Table 3, the semiconductor odor sensor 19 was calibrated so that the indicated value became 10 with 5 ppm of hydrogen sulfide gas.

Here, the odor intensity is calculated from the approximate expression (y = 1.5469Ln (x) +0.8504) shown in FIG. 4, and the odor concentration and the odor index are calculated by the following expressions (1) and (2). ,
It was calculated using (3).

Calculation of gas concentration: a relational expression between odor intensity and gas concentration for hydrogen sulfide gas alone Odor intensity = 0.90501 × log gas concentration [ppm] +
The gas concentration [ppm] = 10 ＾ ((odor intensity-4.14) /0.9501) ... (1) Calculation of odor concentration; odor concentration is a stimulus to human olfaction. This is the required dilution factor for diluting with odorless clean air to the threshold concentration at which the odor is felt. For example, an odor concentration of 100
The odor is such an odor that, when diluted 100 times with odorless air, the odor is no longer felt.

The odor concentration for a single odor can be converted from the gas concentration, and can be obtained by dividing the gas concentration of the odorant at that time by the gas concentration of odor intensity 1 (odor that can be finally sensed). it can.

Here, the gas concentration of the odor intensity 1 (odor that can be finally sensed) with respect to the hydrogen sulfide gas alone is 0.00
05 ppm, and the odor concentration is represented by the formula (2).

Odor concentration = gas concentration [ppm] /0.0005 [ppm] (2) Calculation of odor index; the odor index is 10 times the logarithm of the multiplication of the odor concentration as shown in the following equation (3). It is defined as

Odor index = 10 × log odor concentration Response characteristics of semiconductor odor sensor; FIG. 5 shows response characteristics of semiconductor odor sensor to hydrogen sulfide gas.

The measurement data shown in FIG.
m continuously for 10 minutes (between 2 and 12 minutes in the figure) through the sensor section and continuously sampled, and then the change in the odor monitor indicated value when the sensor section is ventilated and washed with odorless air passed through an activated carbon tank It is shown.

FIG. 5 shows that two hours from the start of hydrogen sulfide gas collection.
Within minutes, the odor monitor indicated value rapidly increased (88% value 10 minutes after the start of collection), and thereafter, for 8 minutes (10 minutes after the start of collection), the slope gradually increased.

From this tendency, it can be predicted that the indicated value will not sharply increase after 10 minutes from the collection of the odor. Therefore, the indicated value 10 minutes after the start of the collection of the odor is displayed on the monitor.

Further, since the hydrogen sulfide gas is adsorbed on the sensor section and the indicated value at the time of the next monitor is increased,
The odor monitor indicated value when the odorless air passed through the activated carbon tank was passed through the sensor section to perform aeration cleaning returned to about 0 in 15 minutes (between 12 and 27 minutes in the figure) from the start of cleaning.

However, if the adsorption capacity of activated carbon is reduced or if there is an odor substance which is difficult to remove with activated carbon, the cleaning effect may be reduced. Minutes.

In FIG. 1, normally, the outside air OA is introduced from the outside air introduction duct 15 by the air supply fan 16 and blown into the room 11 to ventilate the room. The air is exhausted from the exhaust port 13 to the atmosphere via the exhaust fan 18, the electric exhaust damper 28, and the damper 29 for adjusting the flow rate.

At this time, the control device 30 switches the three-way cleaning valve 22 and the three-way monitoring valve 25 once every hour, for example, and supplies the room air to be exhausted to the semiconductor odor sensor 19 through the bypass duct 20. The intensity of the odor
Monitor for about 10 minutes.

The control device 30 obtains the odor intensity from this monitor, and the odor intensity is determined to be a predetermined value (for example, as shown in Table 1, the odor intensity is 2.5 in a general residential area).
It is determined whether or not the air temperature is equal to or less than the predetermined value. By switching the three-way valve 22 for cleaning, the cleaning air CA is introduced into the bypass duct 20 through the activated carbon tank 21, and the odorless air is caused to flow to the sensor part of the semiconductor type odor sensor 19 to perform ventilation cleaning. In this case, the control device 30 uses the monitored odor intensity to
The length of the aeration cleaning time is appropriately determined.

Next, when the intensity of the odor monitored by the semiconductor type odor sensor 19 exceeds a predetermined value, the control device 30
Closes the electric damper 28 for exhaust and the electric damper 2 for deodorization.
7, the room air is passed through the adsorbent tank 23 to deodorize,
By exhausting the air after the deodorization from the exhaust port 13 to the atmosphere, it is possible to prevent the emission of offensive odor to the surroundings.

During the deodorization through the adsorbent tank 23, room air is introduced into the semiconductor type odor sensor 19, and the intensity of the odor is reduced.
If the pressure falls below a predetermined value, the exhaust electric damper 28
Is opened, the deodorizing electric damper 27 is closed, and switching to normal ventilation is performed.

In a room 11 such as a cleaning establishment or a restaurant,
For example, at a cleaning establishment, when delivering garbage, at a restaurant, the intensity of odor is high during cooking, and at other times,
The odor intensity is not very high.

Therefore, the odor of the indoor air to be exhausted is monitored, and when the intensity of the odor becomes higher than a predetermined value, the odor is deodorized through the adsorbent tank 23 to extend the life of the adsorbent in the adsorbent tank 23. And the operating cost can be reduced.

The control device 30 includes the three-way valve 2 for monitoring.
5, the air exhausted from the adsorbent tank 23 is introduced into the semiconductor odor sensor 19 to monitor the intensity of the odor, and the intensity of the odor is compared with that of the indoor air flowing into the adsorbent tank 23. This makes it possible to monitor a decrease in the adsorbing capacity of the adsorbent in the adsorbent tank 23, so that it is possible to predict the life of the adsorbent.

FIG. 2 shows another embodiment of the present invention, and shows a deodorizing system for air-conditioning and ventilation in a room such as a hospital or a nursing home.

FIG. 2 shows a deodorizing system for ventilation and ventilation of a room 11 in a building 10 such as a hospital or a nursing home.

The building 10 is provided with an outside air OA introduction port 12 and an exhaust port 13. The outside air OA is introduced into the room 11 by connecting the introduction port 12 and the ceiling 14 of the room 11. The air conditioner 40 is connected to the duct 15.

An exhaust duct 17 is provided connecting the ceiling 14 of the room 11 and the exhaust port 13, and an exhaust fan 18 is connected to the exhaust duct 17.

A circulation duct 41 is connected between the exhaust duct 17 and the outside air introduction duct 15 on the suction side of the air conditioner 40.

The circulation duct 41 has
A bypass duct 42 for introducing a part of the circulating air passing through the odor sensor 19 to the semiconductor type odor sensor 19 and returning the circulating air to the circulation duct 41 is connected.

The bypass duct 42 has a three-way cleaning valve 22 for introducing the cleaning air CA from the activated carbon tank 21, a duct 44 for introducing a part of the air from the adsorbent tank 43, and the semiconductor odor sensor 19. Switching three-way valve 45 for monitoring
Is connected.

The circulating duct 41 is connected to a deodorizing duct 46 for flowing circulating air from the room 11 to the adsorbent tank 43 in parallel with the duct 41.

The deodorizing duct 46 on the upstream side of the adsorbent tank 43
Is connected to a deodorizing electric damper 47 for introducing circulating air from the circulating duct 41.
A circulation electric damper 48 and a flow rate adjustment damper 49 are connected to the circulation duct 41 to which 6 is connected.

The deodorizing duct 46 on the downstream side of the adsorbent tank 43
A duct 44 for supplying air passing through the adsorbent tank 43 to the semiconductor odor sensor 19 through the three-way valve 45 for monitoring.
Is connected.

The detection value of the semiconductor odor sensor 19 is input to the control device 50. The control device 50 includes a three-way valve 22 for cleaning, a three-way valve 45 for monitoring, and the electric damper 4 for deodorization.
7. The electric dampers 48 for circulation are respectively controlled.

In FIG. 2, the outside air OA is supplied to the inlet 12.
The air conditioner 40 together with the circulating air from the circulation duct 41
, Where it is air-conditioned and blown out into the room 11 via the outside air introduction line 15. The air in the room 11 is exhausted from the exhaust fan 18, and a part of the air is exhausted from the exhaust line
3 and the rest is returned from the circulation duct 41 to the air conditioner 40 and circulated.

The ventilation by the outside air OA is adjusted so that, for example, when the conditioned air from the air conditioner 40 is 100%, the amount of circulating air is 70%, and the amount of outside air introduced and exhausted is 30%.

The deodorization control system shown in FIG. 2 is basically the same as the deodorization control system shown in FIG. 1. When the room 11 is air-conditioned while introducing outside air, one of the circulating air in the circulation duct 41 is removed. Is supplied from the bypass duct 42 to the semiconductor type odor sensor 19 to monitor the intensity of the odor. When the odor intensity is equal to or higher than a predetermined value, the control device 50 closes the electric damper for circulation 48 and the electric damper 47 for deodorization. When opened, the circulating air flows into the adsorbent tank 43 via the deodorizing duct 46 to deodorize.

After the monitoring, the odorless air passing through the activated carbon tank 21 is supplied to the sensor section of the semiconductor type odor sensor 19 to perform aeration cleaning, and the adsorbent capacity of the adsorbent in the adsorbent tank 43 is monitored. This is performed by supplying the semiconductor odor sensor 19 from the duct 44 through the three-way valve 45 for monitoring.

The bad smell generated in the room such as a hospital or a nursing home is a disinfectant smell such as formalin or a filth smell. These smells are not always generated but generated for a very limited time. At 19, these odors are monitored intermittently, and when the intensity of the odors becomes a predetermined value or more, circulating air is passed through the adsorbent tank 43 to remove the odors, thereby extending the life of the adsorbent. it can.

In the above-described embodiment, the odor monitoring interval of the semiconductor odor sensor 19 has been described as one hour. However, a sensor having good response characteristics or a plurality of semiconductor odor sensors 19 may be used for monitoring. By doing so, it is of course possible to enable monitoring in units of tens of minutes.

[0067]

In summary, according to the present invention, the odor of indoor air is monitored, and when the intensity of the odor becomes higher than a predetermined value, the odor is released through the adsorbent tank to release an odor to the neighborhood. Not only can be prevented, but the life of the adsorbent can be prolonged, and the operating cost can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing details of a semiconductor odor sensor used in the present invention.

FIG. 4 is a diagram showing a relationship between an odor monitor instruction value and an odor intensity in a semiconductor type odor sensor in the present invention.

FIG. 5 is a diagram showing a hydrogen sulfide gas (concentration of 1 pp) in the present invention.
FIG. 6 is a diagram showing characteristics of the semiconductor odor sensor when m) is passed through the semiconductor odor sensor, and then the air is washed by ventilation and ventilation.

[Explanation of symbols]

 11 room 15 outside air introduction duct 19 semiconductor type odor sensor 21 activated carbon tank 23 adsorbent tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F24F 7/08 F24F 7/08 A F-term (Reference) 3L056 BD01 BF06 3L058 BE08 BG03 4C080 AA05 BB02 CC12 HH05 JJ01 KK08 LL02 QQ17 4D012 CA09 CB11 CE02 CF05

Claims (3)

[Claims] 1. A ventilation system for introducing outside air into a room such as a cleaning office or a restaurant and exhausting the room air to the atmosphere. Supply, monitor the intensity of the odor, and at intervals during the monitoring, supply odorless air through the activated carbon tank to the sensor unit to perform ventilation cleaning, and monitor the intensity of the odor using the semiconductor type odor sensor. When the value exceeds a predetermined value, the room air is exhausted through the adsorbent tank, and when the odor intensity of the room air to be exhausted by the semiconductor type odor sensor falls below the predetermined value, the room air is directly exposed to the atmosphere. A deodorizing control system characterized by exhausting air. 2. Room air in hospitals, nursing homes, etc. is circulated by an air conditioner while air is circulated. Partial outside air is introduced into the air conditioner and blown into the room together with the circulating air. In an air-conditioning ventilation system that exhausts air to the outside air, a part of the indoor air circulated to the indoor unit is supplied to the semiconductor type odor sensor at regular intervals, the intensity of the odor is monitored, and the interval between the monitoring is monitored. Then, odorless air passed through an activated carbon tank is supplied to the sensor unit to perform aeration cleaning, and when the intensity of the odor monitored by the semiconductor type odor sensor becomes a predetermined value or more, air in the circulating chamber is air-conditioned through the adsorbent tank. When the intensity of the odor of the air in the circulating chamber falls below a predetermined value by the semiconductor odor sensor, the circulating air is circulated to the air conditioner as it is and a part of the air is exhausted to the atmosphere. Features a deodorizing control system. 3. The deodorization control system according to claim 1, wherein a part of the air deodorized through the adsorbent tank is introduced into a semiconductor type odor sensor, and the odor is monitored to detect the life of the adsorbent.