JP2003004617A - System and method for managing odor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system and a method for managing various odors, e.g. odor of oil, with high reliability while making the most use of the advantage of an odor sensor which can detect the odor selectively although the detection speed is low. SOLUTION: The odor managing system judges presence of odor from the operation of a first odor sensor, e.g. a crystal oscillator sensor 1, which can detect the odor of oil, or the like, possibly contained in a fluid being managed selectively although the detection speed is low and the operation of a second odor sensor, e.g. a semiconductor sensor 2, which detect not only the aforementioned odor but also other odors contained in the fluid being managed although the detection speed is high. In the method for managing odors, the odor generation moment is a moment when the odor intensity detected by the first odor sensor begins to increase and the odor extinction moment is a moment when the odor intensity detected by the second odor sensor decreases abruptly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an odor management device, and more particularly to an odor management device and an odor management method suitable for managing the odor generated by river water supplied to a water purification plant.

[0002]

2. Description of the Related Art When river water containing hydrocarbon-based oil flows into a water purification plant, a large amount of activated carbon must be added to remove the oil. The presence or absence of oil odor is determined from the presence or absence of oil odor by an oil odor sensor, and when an oil odor is detected, an alarm is immediately issued and water intake is stopped. For example, Japanese Patent Laid-Open No. 11-295
In Japanese Patent Laid-Open No. 203, a method for managing the presence or absence of an oily odor using a crystal oscillator sensor is proposed for river water flowing into a water purification plant.

The crystal oscillator sensor has the ability to selectively detect the oily odor emitted from hydrocarbon oils such as light oil, kerosene, and heavy oil. Therefore, this crystal oscillator sensor can detect only oily odors from various odors even when river water emits various odors other than oily odors, and thus it is possible to detect mixing of hydrocarbon-based oil into river waters. it can.

By the way, FIG. 7 shows a typical example of a detection curve of odor intensity by a crystal oscillator sensor until hydrocarbon oil is mixed in river water and is removed. Is the odor intensity detected by the crystal oscillator sensor, the horizontal axis is the elapsed time, and g1 is the odor intensity curve. A is the time when hydrocarbon-based oil is mixed in water, and B is
Indicates the time when the mixed hydrocarbon oil was sufficiently removed from the river water. The above odor intensity is detected by the crystal oscillator sensor that selectively detects only the oily odor, and therefore becomes the oily odor intensity.

Regarding the presence or absence of the oily odor, the oily odor actually occurs at time A when the hydrocarbon oil is mixed into the river water, and at the same time, the intensity of the oily odor becomes an equilibrium value corresponding to the amount of the mixed oil. The oil odor disappears at the same time when the removal of the mixed oil is completed.
Therefore, if the oil odor detection speed of the crystal oscillator sensor is extremely fast, it should sharply increase to the detection intensity corresponding to the above equilibrium value at time A, and should sharply decrease at time B. Since the oil odor detection speed of the child sensor is extremely slow, as is apparent from FIG. 7, it slowly rises from the time point A and almost reaches the equilibrium value around the time point C. The time required from time point A to time point C is about 15 to 20 minutes for kerosene, about 30 to 40 minutes for heavy oil, and about 50 to 60 minutes for light oil. The discovery of hydrocarbon-based oil contamination in water may be delayed.

Further, as is apparent from FIG. 7, although the change (increase) at the time point A is slow, it is possible to recognize the start time point of the change with care, but the change (decrease) after the time point B is small. However, the change (increase) from the time point A is slower, and it becomes extremely difficult to determine the deodorizing time point. If the deodorizing time is delayed, an excessive amount of activated carbon is added to remove the oil component, which is uneconomical.

[0007]

In view of the above problems in the prior art, the present invention takes advantage of the advantage of an odor detection sensor such as a crystal oscillator sensor, which has a slow detection speed but can selectively detect an offensive odor. However, it is an object of the present invention to provide an odor management device and an odor management method capable of highly reliably managing the presence or absence of various offensive odors such as oily odor.

[0008]

The odor management device of the present invention (1) is capable of selectively detecting an odor that may be contained in a fluid to be managed, but has a slow detection speed for the odor. A detection sensor, which has a high detection speed, is provided with a second odor detection sensor that detects not only the odor but also other substances contained in the fluid to be controlled, and the first odor detection sensor and the second odor detection sensor The presence / absence of the odor is determined from the operation.

(2) In the above (1), the first odor detection sensor and the second odor detection sensor are installed in series in the flow direction of the fluid to be managed.

(3) In the above (1), the first odor detecting sensor and the second odor detecting sensor are installed in parallel in the flow direction of the fluid to be controlled, and the first odor detecting sensor is connected to the first odor detecting sensor. It is provided with a first opening / closing device for opening / closing the supply passage of the managed fluid and a second opening / closing device for opening / closing the supply passage of the managed fluid to the second odor detection sensor.

(4) In any one of the above (1) to (3), the control fluid is from a gas in contact with water supplied to the water purification plant, a gas in contact with water in the water purification plant, or a water purification plant. It is a gas that comes into contact with the water that is discharged and distributed, and the odor is a volatile component of oil.

(5) In (4) above, the first odor detection sensor is a crystal oscillator sensor, and the second odor detection sensor is a semiconductor sensor.

(6) The odor management method of the present invention uses (6) the odor management device according to any one of (1) to (5) above, at a point in time when the detected odor intensity in the first odor detection sensor starts increasing. The time when the odor is generated is defined as the time when the abnormal odor disappears when the detected odor intensity of the second odor detection sensor suddenly decreases.

Further, the odor management method of the present invention uses (7) the odor management device according to any one of (1) to (5) above, at the time when the first odor detection sensor starts decreasing the detected odor intensity. And the point of time when the detected odor intensity in the second odor detection sensor suddenly drops is set as the point of time when the odor disappears.

Furthermore, the odor control method of the present invention is
(8) The odor management device according to any one of (1) to (5) is used to detect the presence or absence of a sudden increase in the detected odor intensity in the second odor detection sensor.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 to 3 are views for explaining a first embodiment of an odor management device of the present invention, and FIG. 1 is a schematic configuration diagram of the device of the first embodiment,
FIG. 2 is a graph showing a temporal change of the odor intensity regarding the odor of river water as an example of the controlled fluid, and FIG. 3 is a graph showing a temporal change of the odor intensity regarding air not containing an oily odor.

In FIG. 1, 1 is a crystal oscillator sensor as an example of a first odor detection sensor, 2 is a semiconductor sensor as an example of a second odor detection sensor, and 3 is an example of a fluid to be controlled. Is a transport pipe for transporting the odor of river water generated by the river water supplied to the water purification plant (not shown). The transport pipe 3 includes a main pipe 31, a branch pipe 32 branched from the main pipe 31, and a branch pipe 33. The crystal oscillator sensor 1 is installed in the branch pipe 32, and the semiconductor sensor 2 is installed in the branch pipe 33. The sensing portion of each sensor described above is located in each branch pipe. It should be noted that the transport pipe 3 (main pipe 31, branch pipe 32, branch pipe 33) may flow only the controlled fluid, but normally the river water, which is the generation source of the controlled fluid, is transferred to the transportation pipe 3 through the vapor phase portion. Flow in the existing state, branch pipe 3
2 and the quartz oscillator sensor 1 in the gas phase portion in the branch pipe 33.
Alternatively, each sensing portion of the semiconductor sensor 2 may be exposed.

The crystal oscillator sensor 1 has, for example, a structure in which an organic polymer thin film for adsorbing a gas is formed on the surface of the crystal oscillator, and the mass change due to the adsorption of the gas causes a resonance vibration of the crystal oscillator. What selectively detects the oily odor from the change in the number (ΔF) is used. The semiconductor sensor 2 has, for example, a structure in which a metal oxide semiconductor such as a tin oxide material press-molded between a pair of white metal alloy wire coils is applied and sintered. The one that detects odor is used as a change in the resistance value of the change in the thermal conductivity and the change in the electric conductivity due to the adsorption of the gas as seen from both ends of the white metal alloy wire coil.

FIG. 2 is composed of FIGS. 2 (a) and 2 (b), and the odor (oil) detected by the crystal oscillator sensor 1 is shown in FIG. A curve g1 (same as the odor intensity curve g1 in FIG. 7) showing the temporal change of the odor) intensity is shown, and FIG. 2B shows a curve g2 detected by the semiconductor sensor 2. In FIG. 2, the time axes of FIG. 2 (a) and FIG. 2 (b) are matched. On the other hand, FIG. 3 is composed of FIG. 3A and FIG. 3B, and FIG. 3A shows a curve g3 in the crystal oscillator sensor 1 with the air not containing an oily odor as a comparative management target. 3 (b) shows a curve g4 detected by the semiconductor sensor 2. In FIG. 3, the time axes of FIG. 3 (a) and FIG. 3 (b) are matched.

In FIGS. 2A and 2B, A, B, and C are the crystals when the hydrocarbon-based oil is mixed into the river water, when the mixed hydrocarbon-based oil is substantially removed from the water, as in the case of FIG. The time when the detection value of the vibrator sensor 1 almost reaches the equilibrium value is shown. In other words, at the time points A, B, and C, the oil odor based on the mixed hydrocarbon-based oil is added to the odor of river water to be controlled, the time when the oil odor disappears, and the detected value of the oil odor, respectively. The time when the equilibrium value is almost reached is shown.

The curve g1 in FIG. 2 (a) is the same as that of FIG. 7 and is omitted here. In the curve g2 of FIG. 2B, h1 is the odor intensity based on the odor other than the oil odor peculiar to the river water, and h2 is the odor intensity obtained by adding the oil odor to h1. In the curve g2, however, the semiconductor sensor 2 reacts sensitively to the generation of the oily odor due to the mixing of the hydrocarbon-based oil at the time point A, and the odor intensity sharply increases in contrast to the curve g1 and the odor intensity h2. The equilibrium value is reached, and the value is maintained until time B, and when the mixed hydrocarbon-based oil is removed from the water at time B, the value immediately falls and the odor intensity h1 before time A is settled.

Since the semiconductor type sensor 2 can detect odors other than the oily odor of hydrocarbon-based oil, odor intensity h2 is detected. On the other hand, the crystal oscillator sensor 1
Since it is not possible to detect anything other than the oily odor from the hydrocarbon oil, the odor intensity h2 is not detected on the curve g1 in FIG. 2 (a).
Therefore, the difference between the odor intensity h1 and the odor intensity h2 in the curve g2 of FIG. 2B is the odor intensity due to the oil odor from the hydrocarbon oil.

In FIG. 3, A is the time when a substance other than hydrocarbon oil, for example, ammonia gas was added to odorless air, and B is the time when deammonification gas was completed. Since the crystal oscillator sensor 1 does not detect ammonia gas, the curve g3 in FIG. 3A always shows a zero value. On the other hand, since the semiconductor sensor 2 detects ammonia gas, the curve g4 in FIG. 3B is obtained.

As described above, with the semiconductor type sensor 2 alone,
Even if the presence of odor can be detected at high speed, the type of gas to be detected is unknown. On the other hand, although the crystal oscillator sensor 1 can selectively detect oily odor, its detection speed is slow. Therefore, it is particularly difficult to determine the time point B. However, when the curves g1 and g2 obtained from both the sensors 1 and 2 are viewed in parallel, the situation at time B when the oily odor actually disappears is also viewed. It can be clearly seen that the odor actually disappeared. That is, it was found that some odor suddenly decreased or disappeared at the time point B due to the sharp decrease in the odor intensity on the curve g2. Therefore, it is logically clear that the sharp decrease in the odor intensity at the time point B in the curve g2 is due to the sharp decrease or disappearance of the oily odor. Therefore, at that time, it can be seen that the removal of the hydrocarbon oil from the river water was practically completed.

From the above, as an example of the odor management method of the present invention, the time point A at which the detected odor intensity in the first odor detection sensor 1 starts to rise is regarded as the time point at which the above-mentioned strange odor, that is, oily odor is generated, and the second odor detection sensor At the point B when the detected odor intensity sharply decreases in B, an alarm can be issued to a necessary place as the point when the strange odor disappears. Alternatively, when the hydrocarbon oil is not mixed in the river water, the odor intensity detected by the second odor detection sensor 2 is usually as shown in FIG.
Since the intensity h1 of the first odor detection sensor 1 is constantly monitored by the second odor detection sensor 2, it is determined that an oily odor is generated when it suddenly rises. By confirming the increase in the detected odor intensity, it is possible to detect the presence or absence of an oily odor, and thus to detect the inclusion of hydrocarbon-based oil in river water.

Embodiment 2. FIG. 4 is a schematic configuration diagram of the second embodiment of the odor management device of the present invention, in which the first odor detection sensor 1 and the second odor detection sensor 2 are connected in series to a transport pipe 3 that transports a controlled fluid. The second embodiment is different from the first embodiment in this respect.
Other points are the same. The second embodiment has an economical advantage that the manufacturing cost of the odor management device is low because the transport pipe 3 has a simple structure.

Embodiment 3. FIG. 5 is a schematic configuration diagram of the third embodiment of the odor management device of the present invention, in which the first odor detection sensor 1 and the second odor detection sensor 2 are branched pipes branched from the main pipe 31 of the transportation pipe 3. 32 and the branch pipe 33, and the branch pipe 32 is provided with the valve 4 as an example of the above-mentioned switchgear in front of the first odor detection sensor 1. A valve 5 is provided in front of the two-odor detection sensor 2.

In the third embodiment, after the first odor detection sensor 1 detects the occurrence of an offensive odor (oil odor), the valve 4
Can be closed and the valve 5 is opened so that the second odor detection sensor 2 detects the time when the offensive odor disappears, while the first odor detection sensor 1 is washed to prepare for the detection of the next offensive odor.

Fourth Embodiment FIG. 6 is a schematic configuration diagram of Embodiment 4 in the odor management device of the present invention, in which a second odor detection sensor 2 is installed before and after the first odor detection sensor 1. By installing the two second odor detection sensors 2, it is possible to more reliably detect the time point at which the strange odor disappears or the occurrence of the strange odor.

Embodiment 5. In the fifth embodiment, any one of the first to fourth embodiments is used, and the configuration shown in FIG.
The curves g1 and g2 of (b) are obtained, and the decrease in the odor intensity in the curve g1 and the decrease in the odor intensity in the curve g2 are ANDed.
As a condition, it is determined that there is no offensive odor when the AND condition is satisfied. By doing so, the reliability of the determination that there is no offensive odor is improved.

The present invention is not limited to the above-described first to fifth embodiments, but includes various modifications. That is, as the first odor detection sensor, other sensors may be used instead of the above-mentioned crystal oscillator sensor, for example, an oil film detector using the pulse fluorescence method, an oil film sensor for measuring the deflection ratio of the reflected light of the laser, and the like. Well, as the second odor detection sensor,
Instead of the above-mentioned semiconductor type sensor, another sensor (surface wave element, conductive polymer, metal oxide or semiconductor oxide,
Surface plasmon utilizing devices) and detectors (thermal conductivity detector, hydrogen flame ion detector, photoionization detector, etc.)
And so on. It has been described above that the first odor detection sensor selectively detects a target offensive odor, but selectively does not mean that it does not respond to anything other than the target offensive odor. It can also be applied to the detection of substances other than odor and the management of equipment. That is, by combining the first detection sensor that selectively responds to the detection target substance but has a slow detection speed, and the second detection sensor that responds to a substance other than the detection target substance but has a high detection speed, the target substance It becomes possible to effectively detect the presence or absence of. Also,
By using this combination, it becomes possible to effectively manage the manufacturing apparatus or the like that generates the target substance.

[0032]

As described above, the odor control device of the present invention is capable of selectively detecting (1) an odor that may be contained in a fluid to be controlled, but the detection speed for the odor is slow. Odor detection sensor, provided with a second odor detection sensor for detecting not only the offensive odor but also other odors contained in the fluid to be controlled, which has a high detection speed, the first odor detection sensor and the second odor detection sensor. The presence or absence of the odor is determined based on the operation of, for example, (5) the first odor detection sensor is a crystal oscillator sensor, and the second odor detection sensor is a semiconductor sensor. , The first odor detection sensor starts to increase the detected odor intensity as the time when the odor such as an oily odor occurs, and the second odor detection sensor suddenly decreases the detected odor intensity as the time when the odor disappears. It is possible to alert the necessary portions Te. Alternatively, the odor intensity in a normal state where the hydrocarbon oil is not mixed into the river water is monitored by the second odor detection sensor, and when it rises rapidly, it can be determined that an offensive odor such as an oily odor has occurred.

(2) In the above (1), when the first odor detecting sensor and the second odor detecting sensor are installed in series in the flow direction of the fluid to be controlled, Since the structure is simple, there is an economical effect that the manufacturing cost of the odor control device is low.

(3) In (1) above, the first odor detection sensor and the second odor detection sensor are installed in parallel in the flow direction of the fluid to be controlled, and the first odor detection sensor is connected to the first odor detection sensor. A first opening / closing device for opening / closing the supply path of the managed fluid and a second opening / closing device for opening / closing the supply path of the managed fluid to the second odor detection sensor,
After detecting the occurrence of offensive odor with the first odor detection sensor,
The first opening / closing device is closed and the second opening / closing device is opened, and the second odor detection sensor detects the time when the odor disappears, while the first odor detection sensor is washed to prepare for the detection of the next odor. Can be made.

(4) In any one of (1) to (3) above, the fluid to be controlled is an odor emitted by river water supplied to a water purification plant, and the odor is a hydrocarbon-based oil. If it is an oily odor generated by, it is possible to temporarily block the inflow of hydrocarbon-based oil into the water supplied to the water purification plant by knowing it in advance to the water supplied to the water purification plant, and to prevent the hydrocarbons mixed in during that time. It is possible to perform work for removing system oil.

As described above, the odor management method of the present invention uses (6) the odor management device according to any one of (1) to (5) above, and the detected odor intensity in the first odor detection sensor. The start point of rising of the odor is defined as the time point of generation of the odor, and the time point of sudden decrease in the detected odor intensity in the second odor detection sensor is set as the time point of extinction of the odor. (7) In (1) to (5) above Using the odor management device according to any one of the above, the odor disappears at both the start point of the decrease in the detected odor intensity in the first odor detection sensor and the sudden decrease in the detected odor intensity in the second odor detection sensor. Or (8) using the odor management device according to any one of (1) to (5) above, to detect the presence or absence of a sudden increase in the detected odor intensity in the second odor detection sensor. When it is intended to, the effect described in (1).

[Brief description of drawings]

FIG. 1 is a first embodiment of an odor management device of the present invention.
FIG.

FIG. 2 is a graph showing temporal changes in odor intensity of odor of river water, which is an example of a fluid to be managed, detected using the first embodiment.

FIG. 3 is a graph showing a temporal change in odor intensity of air containing no oily odor, which is detected using the first embodiment.

FIG. 4 is a second embodiment of the odor management device of the present invention.
FIG.

FIG. 5 is a third embodiment of the odor management device of the present invention.
FIG.

FIG. 6 is a fourth embodiment of the odor management device of the present invention.
FIG.

FIG. 7 is a graph showing a change over time in the odor intensity of the odor of river water containing an oily odor, which is detected using a crystal oscillator sensor.

[Explanation of symbols]

1 crystal oscillator sensor, 2 semiconductor type sensor, 3 transport pipe, 31 main pipe, 32 branch pipe 32, 33 branch pipe.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01N 27/18 G01N 27/18 F term (reference) 2G046 AA01 AA10 AA18 BA02 CA09 EB01 FA01 FB02 FE31 FE39 2G060 AA01 AB07 AB15 AB26 AE40 AF07 AF08 BA01 BA05 BB02 BB09 BB10 HC07 HC09 HC15 HD05 KA01

Claims (8)

[Claims] 1. A first odor detection sensor capable of selectively detecting an odor which may be contained in a controlled fluid, but having a slow detection speed for the odor, and a high detection speed but not only the odor but the above-mentioned odor. A second odor detection sensor that also detects other substances contained in the control fluid is provided, and the presence or absence of the odor is determined from the operations of the first odor detection sensor and the second odor detection sensor. Odor control device. 2. The odor management device according to claim 1, wherein the first odor detection sensor and the second odor detection sensor are installed in series in a flow direction of a fluid to be managed. 3. The first odor detection sensor and the second odor detection sensor are installed in parallel in the flow direction of the controlled fluid, and a supply passage of the controlled fluid to the first odor detection sensor is provided. The odor management device according to claim 1, further comprising: a first opening / closing device that opens and closes; and a second opening and closing device that opens and closes a supply path of the fluid to be managed to the second odor detection sensor. 4. The controlled fluid is a gas in contact with water supplied to the water purification plant, a gas in contact with water in the water purification plant, or a gas in contact with water discharged and distributed from the water purification plant, and the odor is The odor management device according to any one of claims 1 to 3, which is a volatile component of oil. 5. The odor management device according to claim 4, wherein the first odor detection sensor is a crystal oscillator sensor, and the second odor detection sensor is a semiconductor sensor. 6. The odor management device according to any one of claims 1 to 5, wherein the odor generation time is defined as the time when the odor intensity detected by the first odor detection sensor starts increasing. (2) An odor management method, characterized in that the time point when the detected odor intensity in the odor detection sensor suddenly drops is set to the time point when the odor disappears. 7. The odor management device according to claim 1, wherein the first odor detection sensor starts detecting a decrease in odor intensity and the second odor detection sensor detects odor. An odor management method, characterized in that the odor disappears at both the point of time when the strength suddenly drops and the point of time when the odor disappears. 8. An odor management using the odor management device according to any one of claims 1 to 5 for detecting whether or not the detected odor intensity in the second odor detection sensor is suddenly increased. Method.