JP3811374B2 - Gas leak detection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas leak detection method for combustion equipment in an exhaust duct storage space provided indoors.
[0002]
[Prior art]
Generally, the exhaust gas from indoor combustion equipment is configured to be discharged to the outside through an exhaust duct placed behind the ceiling. That is, incomplete combustion often occurs due to leakage of exhaust gas into the room. If the exhaust duct is perforated or the exhaust duct connection is disconnected, the user may be in danger if the combustion equipment user continues to use the combustion equipment without noticing gas leakage due to incomplete combustion. Will be exposed to. Therefore, as disclosed in JP-A-8-86437, a gas leak due to incomplete combustion is detected by a carbon monoxide sensor, combustion of combustion equipment is stopped, and a person in the room is not exposed to the risk of gas leak. Has been proposed.
[0003]
[Problems to be solved by the invention]
However, when exhaust equipment such as combustion equipment, exhaust ducts, and exhaust fans become old due to long-term use, the exhaust ducts corrode due to aging and become perforated. Or gas leakage due to the exhaust gas of the combustion equipment occurs in the storage space of the exhaust duct. If the exhaust gas leaks into the room, people in the room are at risk of gas leakage, but if the combustion equipment is not incompletely burned, the concentration of carbon monoxide in the exhaust gas is low, so only carbon monoxide is detected. Therefore, it is difficult to detect a gas leak due to the exhaust gas. In such a case, it is assumed that the user of the combustion equipment may continue to use the combustion equipment without noticing the gas leak, and is in danger.
[0004]
In view of the above, the present invention is designed to accommodate an exhaust duct installed indoors so that a user of the combustion device does not continue to use the combustion device without noticing gas leakage even when the combustion device is not incompletely combusted. An object of the present invention is to provide a gas leak detection method capable of reliably detecting a gas leak due to exhaust gas from a combustion device in a space.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is configured such that an exhaust duct of a combustion device is accommodated and disposed in an exhaust duct accommodating space formed by partitioning the interior with a wall surface provided with an inspection port, and the exhaust duct accommodating space includes: A gas leak detection method for a combustion device, wherein an input unit of a gas concentration measuring device including a carbon monoxide sensor and a carbon dioxide sensor is installed in the inspection port in a preparation stage before starting measurement of exhaust gas of the combustion device. The carbon monoxide sensor and the carbon dioxide sensor are used to measure the concentration of carbon monoxide and carbon dioxide inside the exhaust duct storage space, and either or both of the measured values of carbon monoxide and carbon dioxide are measured. When the specified value is exceeded, the exhaust duct storage space should be ventilated to reduce the internal carbon monoxide and carbon dioxide concentrations below the specified value. Taking out the input unit from the inspection port as an initial value by measuring the concentration of carbon monoxide and carbon dioxide inside the exhaust duct housing space by the carbon monoxide sensor and carbon dioxide sensor, and After burning for a predetermined time to fill the exhaust duct housing space with the exhaust gas of the combustion equipment, the input unit is inserted into the inspection port, and the inside of the exhaust duct housing space by the carbon monoxide sensor and the carbon dioxide sensor is inserted. The concentration of carbon monoxide and carbon dioxide is measured, and when one or both of the measured values of carbon monoxide and carbon dioxide are increased by a certain value or more from the initial value, the gas concentration measuring device The exhaust duct housing is displayed with an indication that there is a gas leak from the combustion device in the duct housing space. Wherein the gas leakage of the combustion device during or not.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention. A combustion device 2 is installed in a chamber 1, and exhaust gas generated in the combustion device 2 is exhausted outdoors by an exhaust duct 3. Yes. The exhaust duct 3 is disposed in an exhaust duct storage space 4 formed in a hollow portion on the back side of the ceiling or wall surface. And in order to check the installed piping equipment, the inspection port 10 closed by the lids 10a and 11a that can be opened and closed is provided on the ceiling (or wall surface) on the side close to the combustion device 2, and the inspection port 11 is outdoors. It is provided on the ceiling (or wall surface) on the side close to the exhaust port for exhaust gas exhausted.
[0007]
The worker P opens the lid 11a of the inspection port 11, and the exhaust duct 3 is disposed from the inspection port 11 to the input unit (measurement nozzle) 12a connected to the gas concentration measuring device 12 carried by the worker P. The gas concentration in the storage chamber 4 is measured by being inserted into the storage chamber 4.
[0008]
Next, the procedure for measuring the gas concentration will be described with reference to the flowchart of FIG. First, in step 1, confirmation of an inspection object is performed. In step 1, the worker P has an exhaust duct connected to a water heater (FE type: forced exhaust type, FF type: forced supply / exhaust type) or bath (FE type: forced exhaust type) installed indoors. Make sure that the installation part of the ceiling is located in the exhaust duct storage space behind the ceiling.
[0009]
Next, in step 2, the applicable conditions are confirmed. In step 2, the operator P applies the applicable conditions (1. There is an inspection port on the ceiling. 2. When the exhaust duct penetrates the partition wall behind the ceiling, each of the two spaces where the partition wall is divided is separated. 3. The percentage of the area of the ceiling plate opening through which the exhaust gas leaked from the exhaust pipe installed in the back of the ceiling diffuses from the back of the ceiling to the room is 2% ( .4 1 mat per circular hole with a diameter of 20cm min) or less. it ceiling height is less than or equal to the maximum 1.3 m.) to confirm. If any of these conditions is not satisfied, the inspection is stopped without proceeding to the next step.
[0010]
Next, as step 3, the operation of all combustion appliances that cause noise (CO2, CO) such as gas stoves, small gas water heaters, and oil stoves is stopped.
Next, in step 4, the initial concentration of carbon monoxide and carbon dioxide in the back of the ceiling is confirmed. In step 4, the input unit 12 a of the gas concentration measuring device 12 including the carbon monoxide sensor and the carbon dioxide sensor is connected to the inspection port 11 before the combustion appliance connected to the exhaust duct 3 to be inspected is ignited. The lid 11a is opened and inserted into the inspection port 11, and the concentration of carbon monoxide and carbon dioxide in the exhaust duct storage space is measured by the carbon monoxide sensor and the carbon dioxide sensor, and one in the exhaust duct storage space behind the ceiling is measured. Measure the concentration of carbon oxide and carbon dioxide.
[0011]
In the normal life of general consumers, the maximum or allowable values of the concentrations of carbon monoxide and carbon dioxide are carbon dioxide (5000 ppm) and carbon monoxide (20 ppm). If these values are specified values and the concentration measurement results in either or both of the carbon monoxide and carbon dioxide concentrations exceeding the specified value, open the inspection port and open the window for ventilation. . Thereafter, the concentration of carbon monoxide and carbon dioxide is measured again, and it is confirmed that the concentrations of carbon monoxide and carbon dioxide are below the specified values. However, if it is difficult to ventilate for some reason, stop the inspection.
[0012]
Next, in step 5, the ventilation fan (range hood) is operated. At this time, the windows and doors are closed (in order to make the interior of the room have a negative pressure more than the exhaust duct storage space behind the ceiling, and the exhaust gas is likely to leak from the exhaust pipe). In addition, when the exhaust fan (range hood) is operated in the preliminary check and the combustion exhaust gas flows backward from the combustion appliance body (FE type), the inspection work is performed without operating the ventilation fan (range hood). Next, in step 6, the combustion appliance connected to the exhaust pipe to be inspected is ignited and burned at the maximum capacity. At this time, the inspection port is closed. In order to ensure the safety of workers, the carbon monoxide concentration in the room is continuously measured.
[0013]
Next, in step 7, after 5 minutes or more have passed since ignition, the concentrations of carbon monoxide and carbon dioxide in the exhaust duct storage space behind the ceiling are measured, and pass / fail judgment is performed.
The pass / fail judgment method is as follows.
[0014]
A pass is when both the carbon monoxide and carbon dioxide concentrations are below the criterion value, and a failure is when either one or both of the carbon monoxide and carbon dioxide concentrations exceed the criterion value. . The determination reference value is 50 ppm for carbon monoxide, and the initial concentration +2000 ppm for carbon dioxide.
The gas concentration measuring device 12 is not shown, which indicates that there is a gas leak of the combustion equipment in the exhaust duct housing space 4 when the gas concentration measuring device 12 has increased by a certain value (2000 ppm in this embodiment) or more from the initial value. The display unit displays characters, symbols, symbols, etc., or indicates that there is a gas leak from the combustion equipment using synthesized speech.
[0015]
When there are a plurality of inspection ports, the measurement is sequentially performed for all the inspection ports, and when a failure occurs in the middle, the combustion appliance is immediately stopped at that time. And in the case of a failure, the equipment is improved. In addition, even if it is a pass, it means that there is no trouble at that time, and it does not mean that there will be no trouble in the future. In particular, if there is an increase in the density of the ceiling even if it is below the criterion value, the subsequent facility management should be performed with more care.
[0016]
When the measurement of the concentration of carbon monoxide and carbon dioxide in the exhaust duct storage space behind the ceiling is completed, the combustion appliance is stopped as step 8, and the ventilation fan, window and door remain in the same state as at the time of inspection, and after the combustion appliance is stopped Measure the concentration of carbon monoxide and carbon dioxide in the room. In step 9, after the inspection is completed, the room and the ceiling are ventilated as necessary.
[0017]
【The invention's effect】
As described above, according to the present invention, one of the measured values of carbon monoxide and carbon dioxide in the preparatory stage before starting the measurement of the exhaust gas of the combustion equipment in the exhaust duct storage space provided with the inspection port. When one or both exceeds the specified value, the exhaust duct housing space is ventilated to lower the concentration of carbon monoxide and carbon dioxide below the specified value, and then the internal carbon monoxide and The measured value of the carbon dioxide concentration is set as the initial value, and then the combustion equipment is burned for a predetermined time to fill the exhaust duct storage space with the exhaust gas of the combustion equipment, and then the concentration of carbon monoxide and carbon dioxide inside is measured. When one or both of the measured values of carbon monoxide and carbon dioxide has increased by a certain value or more from the initial value, the gas concentration measuring device Gas leakage of the combustion device in the exhaust duct receiving space made display indicating that there is a gas leakage of the combustion equipment is to be determined in the.
[0018]
Combustion equipment users may experience gas leaks due to exhaust gas from combustion equipment if they have become exhausted due to long-term use of combustion equipment with exhaustive safety measures against incomplete combustion or exhaust ducts, exhaust fans, etc. However, if the combustion equipment is not incompletely burned, it is difficult to detect gas leaks due to exhaust gas only by safety checks such as carbon monoxide gas leaks as a safety measure against incomplete combustion. According to the gas leak detection method of the present invention, in addition to the above safety measures, the exhaust gas of the combustion equipment can be reliably detected in the combustion equipment exhaust duct storage space, and the user of the combustion equipment is not aware of the gas leak. In addition, there is no risk of continuing to use the combustion device, and the detection of the gas leakage is ensured, and the user of the combustion device can safely avoid the risk of gas leakage and is safe.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of the present invention.
FIG. 2 is a flowchart showing a gas concentration measurement procedure.
[Explanation of symbols]
1 Chamber 2 Combustion equipment 3 Exhaust duct 4 Exhaust duct storage space 10, 11 Inspection port 10a, 11a Openable / closable lid 12 Gas concentration measuring device 12a Input unit P Worker

Claims (1)

An exhaust duct of a combustion device is housed and arranged in an exhaust duct housing space formed by partitioning the interior with a wall surface provided with an inspection port, and in the exhaust duct housing space, the gas leak detection method of the combustion device,
In the preparatory stage before starting the measurement of the exhaust gas of the combustion equipment, an input unit of a gas concentration measuring device equipped with a carbon monoxide sensor and a carbon dioxide sensor is inserted into the inspection port, and the carbon monoxide sensor and the carbon dioxide The sensor measures the concentration of carbon monoxide and carbon dioxide inside the exhaust duct housing space, and when one or both of the measured values of carbon monoxide and carbon dioxide exceed a specified value, the exhaust duct housing is stored. After the space is ventilated and the concentration of carbon monoxide and carbon dioxide inside is reduced below the specified value, the amount of carbon monoxide and carbon dioxide inside the exhaust duct storage space by the carbon monoxide sensor and carbon dioxide sensor is reduced. The input unit is taken out from the inspection port with the measured concentration as an initial value, and the combustion device is left for a predetermined time. After burning, the exhaust duct housing space is filled with the exhaust gas of the combustion equipment, and then the input unit is inserted into the inspection port, and the internal monoxide in the exhaust duct housing space by the carbon monoxide sensor and the carbon dioxide sensor. When the concentration of carbon and carbon dioxide is measured and one or both of the measured values of carbon monoxide and carbon dioxide are increased by a certain value or more than the initial value, the gas concentration measuring device is stored in the exhaust duct. A gas leak detection method characterized in that a display indicating that there is a gas leak of the combustion device in the space is made and the gas leak of the combustion device in the exhaust duct storage space is determined.

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