JP6808514B2 - Gas detector inspection system and gas detector inspection method - Google Patents

Description

The present invention uses a gas detector inspection system that supplies inspection gas to an inspection gas supply unit that leads to a gas detector and inspects the gas detector, and the gas detector inspection system. It relates to a gas detector inspection method for inspecting a gas detector.

In the exhaust passage where exhaust gas is discharged from a combustion furnace that burns fuel gas such as a paint drying furnace and a boiler, it is combustible for the purpose of monitoring the presence or absence of flammable gas and the state such as its concentration to ensure safety. A gas detector that is sensitive to sex gas is installed. For example, when starting the operation of a combustion furnace, in order to prevent explosion due to flammable gas accumulated in the exhaust passage, a gas detector is used to set the exhaust passage from 100% LEL (lower explosive limit). It is desirable to start combustion of the fuel gas in the combustion furnace after confirming in advance that there is no flammable gas having a high concentration.

It is necessary to periodically inspect whether or not this type of gas detector operates normally, and carry out appropriate calibration and maintenance. As a gas detector inspection system for inspecting a gas detector, a system capable of supplying inspection gas to an inspection gas supply unit connected to a gas detector is known (for example, Patent Document 1 and See 2.).
That is, in the system described in Patent Document 1, a high-pressure cylinder (7) for storing inspection gas (standard gas) at high pressure is installed, and the inspection gas taken out from the high-pressure cylinder (7) is detected by a gas detector (7). 5) It is configured to supply to the side.
On the other hand, the system described in Patent Document 2 is a gas source (53) in which a filler for impregnation is impregnated with a liquid hydrocarbon such as ethyl alcohol that generates a flammable gas (combustible gas) as an inspection gas. The gas generator (51) is installed in the container (52), and the flammable gas vaporized by the gas generator (51) is supplied to the gas detector (21) side. There is.

Jikkai Sho 57-192457 Japanese Unexamined Patent Publication No. 2006-78434

In the gas detector inspection system described in Patent Document 1 described above, the installation location of the high-pressure cylinder for storing the inspection gas at high pressure is compared as in the vicinity of the combustion furnace where the gas detector sensitive to flammable gas is installed. When the temperature is high, the high-pressure cylinder is always kept at a low temperature (for example, 40 ° C or less) to ensure safety, so that a roof, a barrier, a sprinkler, etc. are installed, which is complicated and many. Expensive measures need to be taken.
On the other hand, in the gas detector inspection system described in Patent Document 2 described above, since the flammable gas obtained by vaporizing the liquid hydrocarbon is used as the inspection gas, it is often used for the preparation and safe handling of the liquid hydrocarbon. Expenses and labor are required.
Further, in these conventional gas detector inspection systems, especially when a flammable gas is used as an inspection gas, the flammable gas leaks in order to safely store the inspection gas for a relatively long period of time. Must be reliably prevented.

In view of this situation, the main problem of the present invention is to supply the inspection gas to the inspection gas supply unit which is connected to the gas detector, and to realize high safety and rationalization of the system configuration when inspecting the gas detector. The point is to provide the technology to do.

The first characteristic configuration of the present invention is a gas detector inspection system that inspects the gas detector by supplying the inspection gas to the inspection gas supply unit that leads to the gas detector.
It is provided with a sealed gas storage container for internally storing a nonflammable liquid together with the inspection gas, and a gas supply pipe for connecting the air layer portion in the gas storage container and the inspection gas supply portion. ,
The point is that a pressure applying means for applying a pressure to the air layer portion in the gas storage container by applying an ascending force to the liquid level in the gas storage container is provided.

According to this configuration, the pressure application means applies an ascending force to the liquid level in the gas storage container, so that the gas is stored in the same air layer with respect to the air layer in the gas storage container. It is possible to apply a pressure (hereinafter, may be referred to as “supply pressure”) for appropriately supplying the inspection gas to the inspection gas supply unit on the gas detector side. As a result, when inspecting the gas detector, the inspection gas can be supplied from the gas storage container to the inspection gas supply unit through the gas supply pipe as the liquid level in the gas storage container rises. ..

Further, in the gas storage container, the pressure applying means applies an ascending force to the liquid level of the liquid layer portion without directly contacting the air layer portion to apply the pressure to the gas layer portion. A so-called liquid sealing structure is realized in which a highly safe nonflammable liquid is always interposed between the air layer portion and the contact portion of the pressure applying means. As a result, the inspection gas stored in the air layer portion can be prevented from leaking to the outside through the pressure applying means, and the inspection gas can be safely stored for a relatively long period of time.
Therefore, according to the present invention, a gas detector inspection system that realizes high safety and rationalization of the system configuration when inspecting the gas detector by supplying the inspection gas to the inspection gas supply unit connected to the gas detector. Can be provided.

The second characteristic configuration of the present invention is that it is provided with an inspection gas supply pipe that connects the inspection gas replenishment unit to which the inspection gas is replenished and the liquid layer portion in the gas storage container.

According to this configuration, it is not necessary to keep the inspection gas for replenishment in the system by, for example, a high-pressure cylinder, and the inspection gas for replenishment is injected from the outside into the inspection gas replenishment unit. With the decrease in the liquid level inside, the inspection gas can be safely replenished from the inspection gas replenishment unit to the gas storage container through the inspection gas replenishment pipe. Further, if the amount of inspection gas stored in the gas storage container is limited, the system configuration can be made compact.

The third characteristic configuration of the present invention includes a liquid storage container in which the liquid is stored inside and the liquid layer portions are connected to the gas storage container.
The point is that the pressure applying means pumps the liquid from the liquid storage container to the gas storage container to exert an ascending force on the liquid level in the gas storage container.

According to this configuration, an ascending force can be applied to the liquid level in the gas storage container in a rational form in which the liquid is pressure-fed from the liquid storage container to the gas storage container by the pressure applying means. As a result, the supply pressure can be appropriately applied to the air layer portion in the gas storage container, and the inspection gas can be stably supplied from the gas storage container to the inspection gas supply unit through the gas supply pipe.

The fourth characteristic configuration of the present invention includes a liquid layer connecting pipe for connecting the liquid layer portion in the liquid storage container and the liquid layer portion in the gas storage container, and also includes a liquid layer connecting pipe.
The pressure applying means causes the liquid level of the liquid storage container to be positioned higher than the liquid level of the gas storage container and causes the liquid pressure to act on the liquid level in the gas storage container to store the liquid. The point is that the liquid is pumped from the container to the gas storage container through the liquid layer connecting pipe.

According to this configuration, it is not necessary to adopt a mechanism such as a pump that mechanically pumps the liquid from the liquid storage container to the gas storage container, and the liquid level in the liquid storage container is adjusted in the gas storage container by the pressure applying means. The liquid can be pumped from the liquid storage container to the gas storage container through the liquid layer connecting pipe by utilizing the principle of siphon or reverse siphon in a rational form of being positioned higher than the liquid level of the liquid. As a result, it is possible to act on the liquid level in the gas storage container as an ascending force with a liquid pressure substantially proportional to the height difference of the liquid level in the gas storage container with respect to the liquid level in the liquid storage container. As a result, the inspection gas is stably supplied from the gas storage container to the inspection gas supply unit through the gas supply pipe as the liquid level in the liquid storage container drops and the liquid level in the gas storage container rises. be able to.

Further, the hydraulic pressure acting as an ascending force of the liquid level in the gas storage container is stable because it is substantially proportional to the above height difference, and from the liquid storage container to the gas storage container through the liquid layer connecting pipe. The flow rate of the pumped liquid is stable, and sudden fluctuations in the liquid level in the gas storage container are suppressed. As a result, the inspection gas supply section on the gas detector side is more stable for inspection. Gas can be supplied.

The fifth characteristic configuration of the present invention is that the gas storage container and the liquid storage container are configured such that the horizontal cross-sectional area of the internal liquid storage space is constant in the vertical direction.

According to this configuration, in the gas storage container and the liquid storage container, the horizontal cross-sectional area of the internal liquid storage space is constant in the vertical direction, in other words, the liquid level area due to the change in the liquid level stored inside. It is configured so that no change occurs. As a result, when inspecting the gas detector, when a certain amount of inspection gas is supplied from the gas storage container to the inspection gas supply unit on the gas detector side, the liquid level in each of these containers is level. Regardless of the above, the range of change in the liquid level of each of them is constant. Therefore, the hydraulic pressure acting as an ascending force of the liquid level in the gas storage container always changes in the same state, and as a result, the inspection gas is more stable with respect to the inspection gas supply part on the gas detector side. Can be supplied.

The sixth characteristic configuration of the present invention is that the gas storage container is configured by arranging the insertion portion of the pipe on the bottom surface side.

According to this configuration, the gas storage container for storing the inspection gas has an insertion portion of a pipe such as a gas supply pipe for supplying the inspection gas to the gas supply portion on the bottom surface side. A so-called liquid sealing structure will be realized in a state where a highly safe nonflammable liquid is always interposed in the insertion part of the pipe without directly contacting the inspection gas stored in the gas storage container. It is possible to reliably prevent the inspection gas from leaking to the outside, and to safely store the inspection gas for a longer period of time.

The seventh characteristic configuration of the present invention is that the liquid is a liquid that exhibits poor solubility in the inspection gas.

According to this configuration, the inspection gas is suppressed from being dissolved in the liquid also stored in the gas storage container in the gas storage container, and the storage amount of the inspection gas is prevented from being unnecessarily reduced. it can. As a result, the inspection gas can be stored in the gas storage container for a relatively long period of time, and the inspection gas can be supplied to the gas detector side to carry out the inspection of the gas detector.

The eighth characteristic configuration of the present invention is that the gas detector is a gas detector that is sensitive to flammable gas in the exhaust path leading into the combustion furnace.

According to this configuration, a gas detector that is sensitive to the flammable gas in the exhaust path leading to the combustion furnace is targeted for inspection, and even when the flammable gas is used as the inspection gas, the combustible gas is used in the combustion furnace. It is possible to safely store the gas in a gas storage container installed in the vicinity, supply the flammable gas to the gas detector side with a rational configuration, and inspect the gas detector.

The ninth feature configuration of the present invention is a gas detector inspection method in which an inspection gas is supplied to an inspection gas supply unit that leads to a gas detector to inspect the gas detector.
A sealed gas storage container for internally storing a nonflammable liquid together with the inspection gas, and a gas supply pipe for connecting the air layer portion in the gas storage container and the inspection gas supply portion are provided.
A pressure application process in which an ascending force is applied to the liquid level in the gas storage container to apply pressure to the air layer portion in the gas storage container.
A point is to execute an inspection process of supplying the inspection gas from the gas storage container to the inspection gas supply unit through the gas supply pipe with an increase in the liquid level in the gas storage container.

According to this configuration, the same operation and effect as the above-described first characteristic configuration can be obtained, and the inspection gas can be safely and rationally supplied to the inspection gas supply unit connected to the gas detector.

The tenth characteristic configuration of the present invention includes an inspection gas replenishment pipe that connects an inspection gas replenishment unit to which the inspection gas is replenished and a liquid layer portion in the gas storage container, and stores the liquid inside. A liquid storage container and a liquid layer connecting pipe for connecting the liquid layer portion in the liquid storage container and the liquid layer portion in the gas storage container are provided.
The pressure application process is a process in which the liquid is pressure-fed from the liquid storage container to the gas storage container through the liquid layer connecting pipe to exert an ascending force on the liquid level in the gas storage container.
After executing the replenishment process of replenishing the gas storage container with the inspection gas from the inspection gas replenishment unit through the inspection gas replenishment pipe with the decrease of the liquid level in the gas storage container, the inspection is performed. The point is to execute the process.

According to this configuration, by executing the replenishment process, for example, the inspection gas for replenishment is injected from the outside into the inspection gas replenishment unit, and the inspection is performed with a drop in the liquid level in the gas storage container. The inspection gas can be safely supplied to the gas storage container from the inspection gas supply section through the inspection gas supply pipe. Then, by executing the inspection process after executing the replenishment process, the inspection gas is rationally sent from the gas storage container to the inspection gas supply unit through the gas supply pipe with an increase in the liquid level in the gas storage container. Can be supplied.

The eleventh feature configuration of the present invention is that the replenishment process is executed every time the inspection process is executed a plurality of times.

According to this configuration, when the inspection process is periodically executed, the replenishment process can be executed every time the inspection process is executed a plurality of times to replenish the inspection gas in the gas storage container. As a result, the number of executions of the replenishment process for replenishing the inspection gas can be reduced as much as possible, and workability can be improved.

Diagram showing the schematic configuration of the gas detector inspection system and the state during inspection processing Diagram showing the schematic configuration of the gas detector inspection system and the state during replenishment processing

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.
In the gas detector inspection system (hereinafter referred to as "this system") 50 shown in FIGS. 1 and 2, the pipeline in which the fluid is flowing is shown by a thick solid line, and the fluid is flowing. Pipelines that are not shown are shown by solid lines.

In the present embodiment, the system 50 is installed in the vicinity of the inspection gas supply unit 70a leading to the gas detector S that is sensitive to a specific component, and supplies the inspection gas G to the inspection gas supply unit 70a. It is configured as a system that automatically inspects the gas detector S.
Further, the gas detector S is configured to be sensitive to a flammable gas such as methane as a specific component, and includes a combustion furnace 60 for burning fuel gas such as a paint drying furnace and a boiler, and an exhaust duct 64. It is installed in the connecting exhaust passage 61.

Various auxiliary equipment such as a pump 63 and a flow meter 62 are installed on the downstream side of the gas detector S in the exhaust passage 61, while the exhaust is on the upstream side of the gas detector S in the exhaust passage 61. A diluting gas supply path 70 for introducing a diluting gas such as the atmosphere or an inert gas is connected to the path 61. Further, the dilution gas supply path 70 is provided with various auxiliary machines such as a pump 71, an on-off valve 72, and a flow meter 73. Then, the output of the pump 63 is controlled in the exhaust passage 61 based on the flow rate measured by the flow meter 62, and the output of the pump 71 is output in the flow meter 73 with the on-off valve 72 opened in the diluting gas supply path 70. By controlling based on the flow rate measured in, a constant flow rate of exhaust gas is attracted from the combustion furnace 60 to the exhaust passage 61, and a constant flow rate is diluted with respect to the upstream side of the gas detector S in the exhaust passage 61. It is configured to supply gas.

Since the dilution gas supply path 70 is provided, the exhaust gas discharged from the combustion furnace 60 is diluted with the dilution gas in the exhaust passage 61 and the exhaust duct 64 connected to the downstream side thereof. Since the air flows in a state where the dew point temperature is lowered, dew condensation is prevented. Then, when the diluted exhaust gas flowing through the exhaust passage 61 contains a flammable gas having a certain concentration or more, the gas detector S installed in the exhaust passage 61 operates to issue a predetermined alarm. By issuing it, the state will be grasped.

As shown in FIG. 1, the system 50 refers to the inspection gas supply unit 70a through the gas supply pipe 40 connected to the inspection gas supply unit 70a of the dilution gas supply path 70 leading to the gas detector S. It is configured to be able to supply a predetermined inspection gas G.
Here, as the inspection gas G, a gas containing a specific component sensitive to the gas detector S can be used, but in the present embodiment, the fuel gas used as fuel in the combustion furnace 60 is used as the inspection gas. It is used as G. Even when the fuel gas is used as it is as the inspection gas G in this way, in this system 50, the inspection gas G supplied to the inspection gas supply unit 70a is diluted with the dilution gas and is flammable. After the gas concentration is reduced to 100% LEL (lower explosive limit) or less, the gas is supplied to the exhaust passage 61 and the exhaust duct 64 in which the gas detector S is installed.
Then, in this system 50, the inspection gas G is supplied to the inspection gas supply unit 70a at a predetermined inspection timing such as immediately before the fuel is ignited in the combustion furnace 60 and the operation is started, and the gas detector S is normal. It can be inspected whether it works or not.

Next, a specific configuration of the system 50 will be described.
The system 50 is provided with a sealed gas storage container Va and a liquid storage container Vb.
The gas storage container Va has an opening sealed by the lid member Ca, and is configured as a sealed container that stores the liquid L together with the inspection gas G inside. Further, the gas storage container Va is configured by arranging an insertion portion through which each of the pipes 10, 30, 40 described later is inserted on the bottom surface side, and specifically, is sealed with a lid member Ca provided with the insertion portion. It is installed in a reverse posture with the opened opening on the bottom side. As a result, the mounting portion of the lid member Ca and the insertion portions of the pipes 10, 30, and 40 to the lid member Ca do not come into direct contact with the inspection gas G stored in the gas storage container Va, and are highly safe. A so-called liquid-sealing structure (sometimes called a water-sealing structure when water is used as the liquid L) is realized with a nonflammable liquid L always interposed, and the inspection is performed by this liquid-sealing structure. Leakage of the gas G to the outside is surely prevented.

The liquid storage container Vb stores the liquid L inside, and the liquid layer portions (the portion where the liquid L below the liquid level is stored) are connected to the gas storage container Va through the liquid layer connecting pipe 30. It is configured as a closed container. The liquid storage container Vb is configured to have an insertion portion through which the ventilation pipe 20 described later is inserted on the upper surface side, and specifically, the upper surface has an opening sealed with a lid member Cb provided with the insertion portion. It is installed in a side view, and a liquid layer connecting pipe 30 described later is connected to the bottom surface thereof.

As the liquid L stored inside the gas storage container Va and the liquid storage container Vb, a nonflammable liquid L is used from the viewpoint of ensuring safety at the time of leakage. Further, in the gas storage container Va, in order to prevent the inspection gas G from being dissolved in the liquid L, a liquid L having a poor solubility in the inspection gas G is used. Then, water or the like can be preferably used as such a liquid L.

The system 50 is provided with an inspection gas supply pipe 10, a ventilation pipe 20, a liquid layer connecting pipe 30, and a gas supply pipe 40 as pipes connected to the gas storage container Va and the liquid storage container Vb. ..
The inspection gas supply pipe 10 stores the inspection gas supply unit 45 in which the inspection gas G is replenished with a syringe, a gas bag, or the like, and the liquid layer portion (the liquid L below the liquid level is stored) in the gas storage container Va. It is configured as a pipe to connect with the part). That is, one end side of the inspection gas supply pipe 10 is connected to the inspection gas supply unit 45, while the other end side is an opening end in the gas storage container Va below the liquid level of the liquid L. It is inserted through the lid member Ca with the portion 10a positioned. Further, the inspection gas supply pipe 10 is provided with an on-off valve 11 capable of blocking the flow of the inspection gas G, and further, various types such as a pressure gauge 12 capable of measuring the internal pressure of the gas storage container Va. Auxiliary equipment is provided as needed.

The ventilation pipe 20 is configured as a pipe connecting the exhaust duct 64 and the air layer portion (the portion above the liquid level where the gas A is stored) of the liquid storage container Vb. That is, one end side of the ventilation pipe 20 is connected to the exhaust duct 64 through which the gas A passes, while the other end side is an opening end portion of the liquid storage container Vb above the liquid level of the liquid L. It is inserted through the lid member Cb of the liquid storage container Vb with the 20b positioned. Further, the ventilation pipe 20 is provided with an on-off valve 21 capable of blocking the flow of gas A, and further, various auxiliary machines such as a pressure gauge 22 capable of measuring the internal pressure of the liquid storage container Vb are required. It is provided as appropriate according to the situation.

The liquid layer connecting pipe 30 includes a liquid layer portion (a portion in which the liquid L below the liquid level is stored) in the liquid storage container Vb and a liquid layer portion (a portion below the liquid level) in the gas storage container Va. It is configured as a pipe connecting the liquid L (the part where the liquid L is stored). That is, one end side of the liquid layer connecting pipe 30 is connected to the bottom of the liquid storage container Vb in a state where the opening end portion 30b is located below the liquid level of the liquid L in the liquid storage container Vb. On the other hand, the other end side is inserted into the lid member Ca of the gas storage container Va with the opening end portion 30a located below the liquid level of the liquid L in the gas storage container Va. Further, the liquid layer connecting pipe 30 is provided with a flow rate control valve 31 capable of adjusting the flow rate of the liquid L supplied from the liquid storage container Vb to the gas storage container Va.

The gas supply pipe 40 is configured as a pipe connecting the gas layer portion (the portion above the liquid level where the inspection gas G is stored) in the gas storage container Va and the inspection gas supply portion 70a. There is. That is, one end side of the gas supply pipe 40 is connected to the inspection gas supply unit 70a, while the other end side is the opening end portion 40a in the gas storage container Va above the liquid level of the liquid L. Is inserted into the lid member Ca of the gas storage container Va in a state of being positioned. Further, the gas supply pipe 40 has a flow control valve 41 capable of interrupting the flow of the inspection gas G and adjusting the flow rate of the inspection gas G supplied from the gas storage container Va to the inspection gas supply unit 70a. In addition, a gas treatment unit 42 having a dryer for drying the inspection gas G, a filter for removing impurities, etc., a flow meter 44 capable of measuring the flow rate of the inspection gas G, and the like are provided. Various auxiliary machines are provided as needed. Further, although not shown, the gas supply pipe 40 may be provided with a configuration for stabilizing the flow rate of the inspection gas G such as a capillary. Further, each of the pipes 10, 20, and 30 other than the gas supply pipe 40 may be provided with a gas treatment unit having a filter, a dryer, or the like, although not shown. In addition, other equipment such as an auto drain and a stop valve may be appropriately installed in each of the pipes 10, 20, 30, and 40.

Since the pipes 10, 20, 30, and 40 are provided as described above, the opening ends 10a, 20b of the pipes 10, 20, 30, 40 are provided inside the gas storage container Va and the liquid storage container Vb. , 30a, 30b, 40a and the liquid level of the liquid L are arranged as follows.
That is, in the gas storage container Va, the opening end 10a of the inspection gas supply pipe 10 and the opening end 30a of the liquid layer connecting pipe 30 are arranged on the lower side, and the opening end 40a of the gas supply pipe 40 is on the upper side. It is located in. Then, in the gas storage container Va, the liquid level Ha of the liquid L is maintained within the range between the opening end portions 10a and 30a arranged on the lower side and the opening end portions 40a arranged on the upper side. Has been done.

On the other hand, in the liquid storage container Vb, the open end 30b of the liquid layer connecting pipe 30 is arranged on the lower side, and the open end 20b of the ventilation pipe 20 is arranged on the upper side. Then, in the liquid storage container Vb, the liquid level Hb of the liquid L is maintained within the range between the opening end portion 30b arranged on the lower side and the opening end portion 20b arranged on the upper side. ..

In this system 50, an ascending force is applied to the liquid level Ha in the gas storage container Va, and the inspection gas G of the air layer portion is subjected to the inspection gas with respect to the air layer portion in the gas storage container Va. A pressure applying means X for applying a supply pressure for supplying to the supply unit 70a is provided.
Since the pressure applying means X is provided, in the gas detector inspection method using the system 50, as shown in FIG. 1, the flow control valve 31 is opened and the inside of the liquid storage container Vb is opened. The liquid layer portion and the liquid layer portion in the gas storage container Va are communicated with each other, and the flow control valve 41 is opened to open the gas supply pipe 40 to the inspection gas supply unit 70a for a predetermined time. Then, along with the rise in the liquid level Ha in the gas storage container Va, the inspection process of supplying the inspection gas G from the gas storage container Va to the inspection gas supply unit 70a through the gas supply pipe 40 is executed. Become.

Hereinafter, the detailed configuration of the pressure applying means X and the inspection process using the pressure applying means X will be described with reference to FIG.
The pressure applying means X pumps the liquid L from the liquid storage container Vb to the gas storage container Va in a state where the flow control valve 31 is opened, and exerts an ascending force on the liquid level level Ha in the gas storage container Va. It is configured to perform the pressure application process in the form. Specifically, the liquid level Hb in the liquid storage container Vb (the height of the liquid level of the liquid L stored inside) is positioned higher than the liquid level Ha in the gas storage container Va. The liquid storage container Vb and the gas storage container Va are arranged side by side in the vertical direction. Then, according to the principle of siphon or reverse siphon, the liquid L is pumped from the liquid storage container Vb to the gas storage container Va through the liquid layer connecting pipe 30, thereby reaching the liquid level Ha in the gas storage container Va. On the other hand, an ascending force will be applied.

The height difference Δh of the liquid level Ha in the gas storage container Va with respect to the liquid level Hb in the liquid storage container Vb can be appropriately set. For example, in the present embodiment, the height difference Δh is several tens of cm ( For example, it is set to about 30 cm). Then, the hydraulic pressure substantially proportional to the height difference Δh (corresponding to the head pressure when water is used as the liquid L) acts as an ascending force of the liquid level Ha in the gas storage container Va. Become.
That is, by appropriately setting the height difference Δh of the liquid level Ha and Hb, the ascending force acting on the liquid level Ha in the gas storage container Va can be set to an appropriate value. .. As a result, an excessive increase in the supply pressure applied to the air layer portion in the gas storage container Va is suppressed, and the inspection gas G is stored in the gas storage container Va at a relatively low pressure. And the safety is improved.

Then, in the above inspection process, the flow control valves 31 and 41 are opened in a state where the pressure application process is executed by the pressure application means X and the pressure is applied to the air layer portion in the gas storage container Vb. Liquid pressure is applied from the liquid storage container Vb to the gas storage container Va through the liquid layer connecting pipe 30, and the liquid L is pumped. Then, the liquid level Hb in the liquid storage container Vb drops and the liquid level Ha in the gas storage container Va rises, and the inspection gas G stored in the gas layer portion of the gas storage container Va supplies gas. It will be pushed out to the inspection gas supply unit 70a through the pipe 40.

In the above inspection process, the hydraulic pressure acting as an ascending force of the liquid level level Ha in the gas storage container Va is the height difference Δh of the liquid level Ha in the gas storage container Va with respect to the liquid level Hb in the liquid storage container Vb. Since it is almost proportional to, it is stable without sudden fluctuations. From this, the rising state of the liquid level Ha in the gas storage container Va due to the supply of the inspection gas G from the gas storage container Va to the inspection gas supply unit 70a does not fluctuate abruptly but is stable. As a result, stable supply of the inspection gas G to the inspection gas supply unit 70a is realized.

By adjusting the opening degree of the flow rate control valve 41 to control the outflow amount of the inspection gas G from the gas storage container Va to the gas supply pipe 40, the supply amount of the inspection gas G to the inspection gas supply unit 70a. Can be set to the desired supply amount. On the other hand, since the inspection gas G in an amount substantially corresponding to the inflow amount of the liquid L from the liquid layer connecting pipe 30 to the gas storage container Va flows out from the gas storage container Va to the gas supply pipe 40, the flow control valve 31 By adjusting the opening degree of the liquid layer connecting pipe 30 to control the inflow amount of the liquid L from the liquid layer connecting pipe 30 to the gas storage container Va, the desired supply amount of the inspection gas G to the inspection gas supply unit 70a is also supplied. Can be set to quantity. In this case, when a negative pressure is applied to the gas supply pipe 40, the flow rate control valve 41 can be operated in order to prevent the inside of the gas storage container Va from being depressurized accordingly. Further, by combining both the outflow amount control of the inspection gas G by adjusting the opening degree of the flow rate control valve 41 of the former and the inflow amount control of the liquid L by adjusting the opening degree of the flow rate control valve 31 of the latter, the inspection gas The supply amount of the inspection gas G to the supply unit 70a can be set to a desired supply amount.
In the former control of the outflow amount of the inspection gas G by adjusting the opening degree of the flow rate control valve 41, the flow rate of the inspection gas G, which is a compressible gas, is the control target, so that the supply amount of the inspection gas G is controlled. In the latter case, in the control of the inflow amount of the liquid L by adjusting the opening degree of the flow control valve 31, the incompressible liquid L is the control target, so that the supply amount of the inspection gas G is It is unlikely that an error will occur. Therefore, in order to set the supply amount of the inspection gas G to the inspection gas supply unit 70a with high accuracy, the latter method including the inflow amount control of the liquid L by adjusting the opening degree of the flow rate control valve 31 is adopted. Is desirable.
Further, between the end of the inspection process and the start of the next inspection process, for example, the internal pressure of the gas storage container Va is temporarily released to the atmospheric pressure with the flow control valve 31 closed, and the gas is concerned. It is preferable to set the internal pressure of the storage container Va to a constant external pressure (atmospheric pressure). As a result, the next inspection process can be started with the internal pressure of the gas storage container Va kept constant, and the accuracy of the inspection process can be improved.

The gas storage container Va and the liquid storage container Vb are containers in which the horizontal cross-sectional area of the internal liquid storage space is constant in the vertical direction, specifically, a cylindrical or square tubular container having a cylinder axis along the vertical direction. It is configured as. As a result, even if the liquid level levels Ha and Hb of the liquid L stored inside change in the above inspection process, the liquid level area does not change. Then, in the gas storage container Va and the liquid storage container Vb, in the above inspection process, when a certain amount of inspection gas G is supplied from the gas storage container Va to the inspection gas supply unit 70a on the gas detector S side, Regardless of the respective liquid level levels Ha and Hb in these containers Va and Vb, the amount of change in the respective liquid level levels Ha and Hb is constant, and the height difference Δh of the liquid level levels Ha and Hb The amount of change is also constant. Therefore, the hydraulic pressure acting as an ascending force of the liquid level Ha in the gas storage container Va is always changed in the same state in substantially proportional to the height difference Δh, and as a result, the inspection on the gas detector S side is performed. A more stable supply of the inspection gas G to the gas supply unit 70a is realized.

When the above inspection processes are continuously executed a plurality of times, the liquid level Hb in the liquid storage container Vb decreases and the liquid level Ha in the gas storage container Va rises for each inspection process. Therefore, the height difference Δh of the liquid level level Ha in the gas storage container Va with respect to the liquid level Hb in the liquid storage container Vb becomes smaller stepwise. Then, the ascending force acting on the liquid level Ha in the gas storage container Va also gradually decreases, and the flow control valve 41 is opened to the inspection gas supply unit 70a until a certain period of time elapses. The supply amount of the inspection gas G will also gradually decrease. Then, when this decrease is large, there is a concern that stable inspection cannot be performed.

Therefore, in the present system 50, in order to suppress such a decrease in the ascending force acting on the liquid level Ha in the gas storage container Va, the liquid storage space inside the gas storage container Va and the liquid storage container Vb is horizontal. The cross-sectional area is made as large as possible, and the change width of the liquid level levels Ha and Hb in one inspection process is suppressed to a small value of about several mm to several cm. Then, the change in the height difference Δh of the liquid level Ha in the gas storage container Va with respect to the liquid level Hb in the liquid storage container Vb becomes small, and the gas storage container is used when a plurality of inspection processes are continuously executed. The decrease in the ascending force acting on the liquid level Ha in Va is reduced, and as a result, the decrease in the supply amount of the inspection gas G to the inspection gas supply unit 70a due to the decrease in the ascending force is suppressed. Can be done.

In the gas detector inspection method using the system 50, a replenishment process of replenishing the gas storage container Va with the inspection gas G is executed prior to the execution of the above-mentioned inspection process.
Hereinafter, the detailed configuration of this replenishment process will be described with reference to FIG.
In the above replenishment process, the inspection gas replenishment unit is replenished with the inspection gas G with a syringe, a gas bag, or the like with the flow rate control valve 41 closed and the flow rate control valve 31, the on-off valve 11 and 21 opened. The liquid layer portion of the gas storage container Va is replenished from 45 through the inspection gas replenishment pipe 10. Then, the amount of the inspection gas G stored in the air layer portion in the gas storage container Va increases, and the liquid level Ha in the gas storage container Va drops accordingly, and the liquid level Ha in the gas storage container Va drops accordingly. The liquid L is pushed out to the liquid storage container Vb side through the liquid layer connecting pipe 30, and the liquid level Hb in the liquid storage container Vb rises accordingly. Further, in the liquid storage container Vb, the gas A in the air layer portion is discharged to the exhaust duct 64 through the ventilation pipe 20 as the liquid level level Hb rises. If the flow control valve 31 provided in the liquid layer connecting pipe 30 allows only the flow of the liquid L from the liquid storage container Vb to the gas storage container Va to prevent backflow, this replenishment is performed. In the process, a bypass pipe, a bypass valve, or the like for supplying the liquid L from the gas storage container Va to the liquid storage container Vb may be provided with the flow control valve 31 bypassed.

By executing such a replenishment process, it is not necessary to keep the replenishment inspection gas G in a high-pressure cylinder or the like, and the inspection gas replenishment unit 45 is used for inspection in the gas storage container Va through the inspection gas replenishment pipe 10. Gas G can be safely replenished. Further, since the amount of the inspection gas G stored in the gas storage container Va is limited to the amount corresponding to a plurality of inspection processes, the system configuration is made compact.

Further, this replenishment process (see FIG. 2) is executed every time the above-mentioned inspection process (see FIG. 1) is executed a plurality of times in order to reduce the execution frequency as much as possible.
For example, when the inspection process is executed at a timing immediately before the start of operation of the combustion furnace 60 at a frequency of once a day, the replenishment process can be executed at a frequency of several months or once a year. That is, in the replenishment process, the amount of inspection gas G required for the plurality of inspection processes executed until the next replenishment process is replenished to the gas storage container Va. Then, in a plurality of inspection processes that are continuously executed without going through the replenishment process, the liquid level of the gas storage container Va is increased for each supply of the inspection gas G from the gas storage container Va to the inspection gas supply unit 70a. Ha gradually rises at predetermined width intervals, and the liquid level Hb of the liquid storage container Vb gradually falls at predetermined width intervals.

[Another Embodiment]
(1) In the above embodiment, the pressure applying means X is positioned so that the liquid level Hb of the liquid storage container Vb is higher than the liquid level Ha of the gas storage container Va, and the liquid layer connecting pipe is connected to the liquid storage container Vb. Although it is configured to pump the liquid L to the gas storage container Va through 30, the present invention is not limited to this configuration, and the pressure applying means X raises the liquid level Ha in the gas storage container Va. It is sufficient that the supply pressure is applied to the air layer portion in the gas storage container Va by acting.
For example, the same gas storage container Va and liquid storage container Vb as in the above embodiment are installed without providing a height difference between the liquid level levels Ha and Hb, respectively, and the pressure of the air layer portion of the liquid storage container Vb is set to that of the compressed air. The pressure application means X can be configured so as to pump the liquid L from the liquid storage container Vb to the gas storage container Va through the liquid layer connecting pipe 30 by raising the liquid L by supply or the like.
Further, in the gas storage container Va, the bottom surface portion is configured to be slidable up and down so that the bottom surface portion is mechanically raised, or the liquid L is injected into the inside by a pump or the like. It is also possible to configure the pressure applying means X so as to apply a supply pressure to the air layer portion in the gas storage container Va by applying an ascending force to the liquid level Ha of the gas storage container.

(2) In the above embodiment, the inspection gas supply pipe 10 for connecting the inspection gas supply unit 45 and the liquid layer portion in the gas storage container Va is provided to reduce the liquid level level Ha in the gas storage container Va. Accordingly, the inspection gas replenishment unit 45 is configured to execute the replenishment process of replenishing the gas storage container Va with the inspection gas G through the inspection gas replenishment pipe 10, but the present invention is limited to this configuration. Instead, for example, the inspection gas supply pipe 10 may be omitted and the gas storage container Va may be replaced with a new one that is sufficiently replenished with the inspection gas G to replenish the inspection gas G. Absent.

(3) In the above embodiment, when the inspection gas G is supplied from the gas storage container Va to the inspection gas supply unit 70a, the liquid storage container Vb is charged with the rise of the liquid level Ha in the gas storage container Va. The liquid level Hb is lowered, and the height difference Δh between the liquid level Ha and Hb is reduced. For example, the liquid storage container Vb is increased according to the increase in the liquid level Ha in the gas storage container Va. The liquid L may be replenished therein to raise the liquid level Hb in the liquid storage container Vb so that the height difference Δh of the liquid level Ha and Hb is kept constant.

(4) In the above embodiment, the gas storage container Va and the liquid storage container Vb are configured by a container in which the horizontal cross-sectional area of the internal liquid storage space is constant in the vertical direction, but the present invention is limited to this configuration. Instead, the shapes of these containers Va and Vb can be appropriately modified. For example, a cylindrical or square tubular container may be used in a posture in which the cylinder axis is aligned in the horizontal direction. Further, the horizontal cross-sectional area of the liquid storage space in the gas storage container Va and the horizontal cross-sectional area of the liquid storage space in the liquid storage container Vb do not have to be particularly the same and can be set as appropriate. For example, when the horizontal cross-sectional area of the liquid storage space in the liquid storage container Vb is made larger than that of the gas storage container Va and the inspection gas G is supplied to the inspection gas supply unit 70a, the liquid in the liquid storage container Vb is supplied. The drop width of the surface level Hb may be smaller than the rise width of the liquid level Ha in the gas storage container Va.

(5) In the above embodiment, the gas storage container Va and the liquid storage container Vb are configured by a sealed container whose opening is sealed by the lid members Ca and Cb, but the present invention is not limited to this configuration. , These containers may be formed of a sealed container such as a box-shaped body having no lid member.
Further, when the gas storage container is composed of a sealed container having no lid member, a hole is formed in the bottom surface of the container and the pipe is inserted into the hole, and the pipe insertion portion is placed on the bottom side. Can be placed in.

(6) In the above embodiment, the inspection gas supply pipe 10 is inserted into the lid member Ca in a state where the opening end portion 10a is located below the liquid level of the liquid L in the gas storage container Va. The invention is not limited to this configuration, and the inspection gas supply pipe 10 is inserted into the lid member Ca in a state where the opening end portion 10a is located above the liquid level of the liquid L in the gas storage container Va. You may.

10 Inspection gas supply pipe 30 Liquid layer connection pipe 40 Gas supply pipe 45 Inspection gas supply unit 60 Combustion furnace 61 Exhaust passage 70a Inspection gas supply unit A Gas Ca Lid member Cb Lid member G Inspection gas Ha, Hb Liquid level Level L Liquid S Gas detector Va Gas storage container Vb Liquid storage container X Pressure application means

Claims (11)

It is a gas detector inspection system that inspects the gas detector by supplying the inspection gas to the inspection gas supply unit that leads to the gas detector.
It is provided with a sealed gas storage container for internally storing a nonflammable liquid together with the inspection gas, and a gas supply pipe for connecting the air layer portion in the gas storage container and the inspection gas supply portion. ,
A gas detector inspection system provided with a pressure applying means for applying a pressure to a gas layer portion in the gas storage container by applying an ascending force to the liquid level in the gas storage container. The gas detector inspection system according to claim 1, further comprising an inspection gas supply pipe that connects the inspection gas replenishment unit to which the inspection gas is replenished and the liquid layer portion in the gas storage container. A liquid storage container is provided in which the liquid is stored inside and the liquid layers are connected to the gas storage container.
The gas detector inspection according to claim 1 or 2, wherein the pressure applying means pumps the liquid from the liquid storage container to the gas storage container to exert an ascending force on the liquid level in the gas storage container. system. A liquid layer connecting pipe for connecting the liquid layer portion in the liquid storage container and the liquid layer portion in the gas storage container is provided.
The pressure applying means causes the liquid level of the liquid storage container to be positioned higher than the liquid level of the gas storage container and causes the liquid pressure to act on the liquid level in the gas storage container to store the liquid. The gas detector inspection system according to claim 3, wherein the liquid is pumped from the container to the gas storage container through the liquid layer connecting pipe. The gas detector inspection system according to claim 4, wherein the gas storage container and the liquid storage container are configured such that the horizontal cross-sectional area of the internal liquid storage space is constant in the vertical direction. The gas detector inspection system according to any one of claims 1 to 5, wherein the gas storage container is configured by arranging a pipe insertion portion on the bottom surface side. The gas detector inspection system according to any one of claims 1 to 6, wherein the liquid is a liquid that exhibits poor solubility in the inspection gas. The gas detector inspection system according to any one of claims 1 to 7, wherein the gas detector is a gas detector that is sensitive to flammable gas in an exhaust path leading into a combustion furnace. It is a gas detector inspection method that inspects the gas detector by supplying inspection gas to the inspection gas supply unit that leads to the gas detector.
A sealed gas storage container for internally storing a nonflammable liquid together with the inspection gas, and a gas supply pipe for connecting the air layer portion in the gas storage container and the inspection gas supply portion are provided.
A pressure application process in which an ascending force is applied to the liquid level in the gas storage container to apply pressure to the air layer portion in the gas storage container.
A gas detector inspection that executes an inspection process of supplying the inspection gas from the gas storage container to the inspection gas supply unit through the gas supply pipe with an increase in the liquid level in the gas storage container. Method. An inspection gas supply pipe connecting the inspection gas supply unit to which the inspection gas is replenished and the liquid layer portion in the gas storage container, a liquid storage container for storing the liquid inside, and the liquid storage container. A liquid layer connecting pipe for connecting the inner liquid layer portion and the liquid layer portion in the gas storage container is provided.
The pressure application process is a process in which the liquid is pressure-fed from the liquid storage container to the gas storage container through the liquid layer connecting pipe to exert an ascending force on the liquid level in the gas storage container.
After executing the replenishment process of replenishing the gas storage container with the inspection gas from the inspection gas replenishment unit through the inspection gas replenishment pipe with the decrease in the liquid level in the gas storage container, the inspection is performed. The gas detector inspection method according to claim 9, wherein the process is executed. The gas detector inspection method according to claim 10, wherein the replenishment process is executed every time the inspection process is executed a plurality of times.

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