JP2016055905A - Volatile chemical liquid storage structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a volatile chemical liquid storage structure which detects leakage of volatile chemical liquid and chemical liquid vapor at an early time and can prevent effluence and diffusion to the circumference.SOLUTION: A volatile chemical liquid storage structure includes: a liquid storage tank 3 which connects a reception pipe line 5 for receiving volatile chemical liquid and a discharge pipe line 6 for discharging the chemical liquid and is installed on a floor surface for storing the chemical liquid; a housing chamber 1 which forms a closed space for housing the storage liquid tank; and a surrounding dike 2 formed so as to surround the liquid storage tank on a floor surface. Therein, a chemical liquid vapor detector 7 which is arranged in the neighborhood of the storage liquid tank 3 and detects chemical liquid vapor and a leakage notification unit 8 which notifies leakage of chemical liquid from the liquid storage tank or the pipe line on the basis of a chemical liquid vapor detection signal from the chemical liquid vapor detector.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a volatile chemical storage structure.

  In the event that chemicals leak from chemical tanks that store chemicals that are corrosive or adversely affect the surrounding environment, a means to prevent the leakage and diffusion of leaked chemicals is necessary to prevent environmental contamination and equipment corrosion. is there. In general, it is possible to prevent the chemical liquid from flowing out by providing a tray (drain pan) below the chemical liquid tank, or by providing a pit for storing a liquid barrier and a leaked chemical liquid around the chemical liquid tank. In order to detect chemical leaks, chemical leak detectors are installed in the tray, inside the breakwater, and in the pit. However, when this chemical leak detector is used, the chemical leak detector is not used until the leaked chemical has accumulated to some extent in the receptacle, inside the liquid barrier, in the pit, or until the chemical reaches the chemical leak detector. Leakage may not be detected and early detection may not be possible. As a countermeasure for solving this problem, Patent Document 1 proposes a leakage chemical solution diffusion prevention device.

  The leakage chemical solution diffusion preventing device of Patent Document 1 is located on a receiving tray body with a chemical tank to which a receiving pipe and a supply pipe for receiving a chemical solution are connected, and connected to the receiving tray body with a water supply pipe and a drain pipe. Is equipped with a chemical leak detector. In such an apparatus of Patent Document 1, the bottom surface of the saucer body is always covered with running water by pouring water into the saucer body through the water supply pipe and draining from the drainage pipe. If the chemical solution leaks in and around the chemical tank in such a state, the leaked chemical solution is mixed into the running water, so the chemical leakage detector based on the change in the electrical conductivity in the drainage flowing through the drainage pipe, recognize.

JP-A-5-254592

  In the leaked chemical solution diffusion prevention device of Patent Document 1, when a chemical solution leaks from the chemical solution tank, it is mixed and drained into the running water on the bottom surface of the tray body, and a change in electrical conductivity based on a change in the drainage water quality is detected and leaked Recognize. However, in the apparatus of Patent Document 1, the chemical liquid is a volatile chemical liquid, and the chemical liquid vapor leaks from the chemical liquid tank, or volatilizes before the leaked chemical liquid reaches the tray or immediately after the chemical liquid reaches. In the case where the chemical vapor is accumulated around the chemical tank, the chemical vapor does not mix with the flowing water on the bottom surface of the tray body, so that there is a problem that leakage cannot be detected.

  In view of such circumstances, an object of the present invention is to provide a volatile chemical storage structure capable of detecting leakage of volatile chemicals and chemical vapors at an early stage and preventing outflow and diffusion to the surroundings.

  The volatile chemical solution storage structure according to the present invention accommodates a liquid storage tank installed on the floor for storing a chemical solution to which a receiving pipe for receiving a volatile chemical liquid and a discharge pipe for discharging are connected, and a liquid storage tank. A storage chamber that forms a closed space, and a circulating liquid bank formed to surround the liquid storage tank on the floor surface.

  In such a volatile chemical solution storage structure, in the present invention, a chemical vapor detector that is disposed in the vicinity of the liquid reservoir and detects the chemical vapor, and a liquid storage tank or pipe based on a chemical vapor detection signal from the chemical vapor detector And a leak notification device for notifying the leakage of the chemical solution from the device.

  According to the volatile chemical solution storage structure of the present invention having such a configuration, when the chemical solution leaks from the liquid storage tank or the pipe, the chemical solution is dripped into the circulating liquid barrier, so that the leakage and diffusion of the leaked chemical solution can be prevented. Needless to say, if the chemical liquid leaks and volatilizes immediately after the dropping, the chemical vapor detector detects the chemical vapor, and the leak alarm immediately notifies the leakage. Even when the chemical solution is dripped or when it is volatilized at the time of leakage, the chemical solution vapor detector detects this, and the leak notification device notifies based on this.

  In this invention, it is preferable that the chemical | medical solution vapor | steam detector is located in the range of the circumference | surroundings liquid breakwater in the horizontal direction. This is because there is a high possibility that the leaked chemical solution will drop in this range.

  In the present invention, when the specific gravity of the chemical vapor is larger than that of air, it is effective that the chemical vapor detector is provided at a position lower in the height direction than the peripheral wall of the circulating liquid barrier. When the specific gravity of the chemical vapor is smaller than that of air, it is effective that the chemical vapor detector is provided above the liquid storage tank in the height direction.

  The present invention, as described above, accommodates a liquid storage tank in a storage chamber that forms a closed space, provides a circumferential liquid breakwater formed so as to surround the liquid storage tank on the floor surface, and in the vicinity of the storage tank. It is arranged to have a chemical vapor detector arranged to detect chemical vapor and a leak alarm to notify leakage of chemical from the liquid storage tank and piping based on the chemical vapor detection signal from the chemical vapor detector Therefore, when volatile chemical liquid leaks from the storage tank or piping, the leaked chemical liquid volatilizes and generates chemical vapor, and this chemical vapor leak is detected by the chemical vapor detector, or the chemical vapor leaks. Even in such a case, the chemical vapor detector can detect the leakage, and the occurrence of leakage can be notified by the leakage notification device, so that the countermeasure against the leakage can be appropriately performed.

  Furthermore, in the present invention, since it is not necessary to cover the receiving tray body with flowing water as in the prior art, the facility is simplified by the amount of not using flowing water, and the cost for flowing flowing water can be reduced. In addition, there is no harm to the environment by chemical vapor evaporated from the chemical to the atmosphere at the drainage position of the flowing water together with the flowing water.

It is a schematic block diagram which shows one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the volatile chemical solution storage structure in the present embodiment is provided with a circumferential liquid breakwater 2 on the floor surface of the storage chamber 1 that forms a closed space, and a liquid storage on the circumferential liquid breakwater 2. A tank 3 is installed.

  The circumferential liquid breakwater 2 has a bottom 2A that supports the liquid storage tank 3 and a peripheral wall 2B that rises from the periphery of the bottom 2A, and the peripheral wall 2B, when viewed from above, has the liquid storage tank 3 Is formed so as to surround. The circuit breakwater 2 is required to have leakage resistance and corrosion resistance against chemical solutions.

  The liquid storage tank 3 for storing the volatile chemical liquid is supported by a support leg 4, and the support leg 4 is fixed to the bottom 2 </ b> A of the circulating liquid barrier 2. In the present embodiment, the revolving breakwater 2 has the bottom 2A, but this is not essential, and may have only the peripheral wall 2B. In that case, the floor surface of the storage chamber 1 is the bottom. Leakage resistance and corrosion resistance against chemical solutions equivalent to 2A are required.

  The liquid storage tank 3 is connected to a receiving pipe 5 and a discharge pipe 6 that penetrate the wall of the storage chamber 1. The receiving pipe 5 is provided with an on-off valve 5A, and the discharge pipe 6 is provided with an on-off valve for an outflow side valve 6A.

  A chemical vapor detector 7 is disposed in the range of the peripheral wall 2 </ b> B of the circulating breakwater 2. The chemical vapor detector 7 may be a known gas sensor that reacts with chemical vapor. For example, a capacitance method or an interelectrode electrical resistance method may be employed. The chemical vapor detector 7 determines the set height position according to the type of chemical. That is, when the specific gravity of the chemical vapor is larger than that of air, the chemical vapor detector 7 is installed at a position lower than the height of the peripheral wall 2B of the circulating liquid barrier 2 and the specific gravity of the chemical vapor is smaller than that of air. In this case, it is installed above the liquid storage tank 3 at a position near the liquid storage tank 3 (a position indicated by a broken line in FIG. 1). Further, the chemical vapor detector 7 is arranged at both a position lower than the peripheral wall 2B of the circulating breakwater 2 and a position above the liquid storage tank 3, and the type of the chemical liquid is detected by either one. You may be able to cope with changes. In any case, the chemical vapor detector 7 is effective even if the chemical vapor detector 7 is arranged outside the range of the peripheral wall 2 </ b> B of the circulating liquid barrier 2 in consideration that the chemical vapor diffuses to the periphery.

  The chemical vapor detector 7 is connected to a leak alarm 8 provided outside the storage chamber 1, and when the chemical vapor detector 7 detects the chemical vapor, the leak alarm 8 notifies this.

  In this embodiment, a pit 2A-1 that deepens a part of the bottom 2A of the revolving breakwater 2 or, if there is no bottom, on the floor as shown by a two-dot chain line in FIG. The capacity of the leaked chemical solution to be retained in the circulating liquid barrier 2 can be increased so that the leaked chemical solution does not overflow the peripheral wall 2B.

  In the volatile chemical solution storage structure of the present embodiment configured as described above, the principle of detection of a leaked chemical solution will be described below.

  Volatile chemical liquid is stored in the liquid storage tank 3 through the receiving pipe 5 and discharged through the discharge pipe 6. At this time, when the chemical liquid leaks from the liquid storage tank 3 or the pipe, the chemical liquid drops in the range of the peripheral wall 2B of the circumferential liquid barrier 2 and accumulates on the bottom 2A as time passes. However, the chemical liquid volatilizes and becomes chemical vapor immediately after dropping before it accumulates on the bottom portion 2A, and is immediately detected by the chemical vapor detector 7. Further, even if the chemical solution is vaporized immediately before or after dropping to the bottom 2A, or is already vaporized at the time of leakage, the chemical vapor detector 7 detects the chemical vapor.

  When the specific gravity of the chemical liquid vapor is larger than that of air, the chemical liquid vapor is detected by the chemical liquid vapor detector located below, and when smaller than the air, the chemical liquid vapor is detected by the chemical liquid vapor detector located above. When the chemical vapor is detected by the chemical vapor detector 7, it is recognized that the chemical liquid has leaked in the liquid storage tank or the pipe, and this can be known by notification by the leak alarm 8. In such a case, the operation is stopped by closing at least one of the inflow side valve 5A and the outflow side valve 6A. The inflow side valve 5 </ b> A and the outflow side valve 6 </ b> A may be automatically controlled to open and close together with or in place of the operation of the leak notification device 8 based on the detection signal of the chemical vapor detector 7.

DESCRIPTION OF SYMBOLS 1 Storage room 2 Circulation breakwater 3 Storage tank 5 Receiving piping 6 Discharge piping 7 Chemical vapor detector 8 Leakage alarm

Claims (4)

A storage tank installed on the floor for storing a chemical solution to which a receiving pipe for receiving volatile chemical liquid and a discharge pipe for discharging are connected; a storage chamber forming a closed space for storing the liquid storage tank; In a volatile chemical storage structure having a surrounding dike formed so as to surround the liquid storage tank on the floor surface,
A chemical vapor detector disposed near the liquid storage tank for detecting chemical vapor, and
A leak notification device for notifying the leakage of the chemical solution from the liquid storage tank or the pipe based on the chemical vapor detection signal from the chemical solution vapor detector;
A volatile chemical storage structure characterized by comprising:   The volatile chemical storage structure according to claim 1, wherein the chemical vapor detector is provided in a horizontal direction so as to be located within a range of the circulating liquid barrier.   The volatile chemical storage structure according to claim 1 or 2, wherein the chemical vapor detector is provided at a position lower in the height direction than the peripheral wall of the circulating breakwater.   The volatile chemical storage structure according to claim 1 or 2, wherein the chemical vapor detector is provided above the liquid storage tank in the height direction.

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