JPS6259769B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is designed to collect and collect leakage fluid mixed into water piping.
The present invention relates to a detection device, particularly a device for collecting and detecting mixed fluid leaked into cooling water from the side of the fluid to be cooled in heat exchange systems and the like in oil, chemical, and other equipment industries.

Generally, in the petroleum and other equipment industries, heat exchange systems, such as liquid or gaseous petroleum,
There are many systems in use that use water or the like to cool or condense a fluid to be cooled, such as a liquid or a mixture thereof. In such a system,
Corrosion perforation of heat transfer tubes by cooling water or cooled fluid,
There is a possibility that petroleum, other liquids, or gases may leak into the cooling water due to breakage of heat exchanger tubes, loosening of expanded portions of heat exchanger tubes, damage to gaskets, or incorrect operation during operation.

However, the mixing and dispersion of oil or gas into cooling water often causes secondary disasters such as pollution, poisoning, fire, and explosions, and early detection is highly desirable from the standpoint of pollution prevention and safety. For this purpose, the inventor of the present application has developed a collection system installed in water pipes, taking advantage of the properties of mixed fluids such as oil and gas, which have a specific gravity lower than water and are difficult to dissolve in water. He invented a device for collecting and detecting mixed fluid introduced from a means using a detection device in the form of a closed container equipped with a means for detecting liquid level, etc., and filed a patent application (Japanese Patent Application No. 72217-1983).

The present invention provides the apparatus of the above invention in which the structure of the collection orifice, which is provided in the horizontal part of the water pipe as a means for collecting mixed fluid and partially dams the upper part of the cross section of the pipe, is of a cutout type or The object of the present invention is to provide an automatic or selective detection, warning and/or recovery device for clearly defined and collected entrained fluid in an eccentric or threaded orifice or a combination thereof.

Hereinafter, the configuration of the present invention will be explained with reference to the drawings. FIG. 1 shows an embodiment of the mixed fluid collecting and detecting device of the present invention. The main body 1, which is an element of the mixed fluid detecting device, is in the shape of a closed container, and is circular, circular, circular, or circular.
The sample inlet 2, which has a suitable cross section such as a rectangular shape, is arranged at the bottom of the main body 1 and connected to a sample collection pipe 11 arranged in a water pipe 3 at a water outlet of the heat exchange system via a main valve 4. are doing. The detector 9 disposed on the side of the main body 1 may be a gas detector or a liquid level visual detection type, capacitance type, conductivity type, ultrasonic type, float type, etc. at the interface between water and a different liquid. Select any suitable detector or water level detector.

An entrained fluid outlet 5 is provided at the top of the main body 1;
It is opened to the atmosphere via an on-off valve 6, such as a solenoid valve, which responds to the detection operation of the detector 9, or is communicated with a mixed fluid recovery device 7 via a discharge pipe 8. Here, 10 is an electrical or pneumatic transmission line through which the detection signal from the detector 9 flows, and sends a signal for operation to the on-off valve 6 as necessary, and also transmits information to the central monitoring room, etc. It can also be used as a means. Note that if it is not preferable for safety or the environment to collect the material discharged from the discharge pipe 8 in an open system, it may be discharged into a closed system.

Next, the mixed fluid collection means will be described. The mixed fluid collection means is constituted by a sample collection tube 11 attached to a horizontal portion of the water pipe 3 and a mixed fluid collection orifice 12 disposed adjacent to the sample collection pipe 11 on the downstream side of the water. An example of the shape of this mixed fluid collection orifice 12 is shown in FIGS. 2A and 2B. That is, Fig. 2A shows a circular orifice that partially blocks the upper part of the water pipe passage to form a dam above, and Fig. 2B shows an eccentric opening downward in the cross section of the water pipe, similar to the former. In the figure, D is the inner diameter of the water pipe, d is the orifice size, and the orifice ratio (d/D) can be adjusted as appropriate depending on the type of mixed fluid or the expected mixing ratio to the cooling water. However, in normal cases, approximately 1/3 is desirable.

FIG. 2C is a sectional view of an orifice with a threaded hole as a kind of mixed fluid collecting orifice 12 according to the present invention, in which the orifice 12 is installed in the pipes 3, 3.
It is an orifice with a threaded hole in which a threaded hole part 14 connectable to a collection pipe and a circular weir 15 are integrally formed, with a flange 13 or the like interposed therebetween as appropriate. It is a view from arrow A. With this structure, the mixed fluid collection means can be made compact, easy to install, and added value can be increased.

The operation and function of the mixed fluid collection/detection device according to the present invention configured as described above will be described as follows. In FIG. 1, a part of the cooling water flowing in the direction of the arrow in the water pipe 3 is dammed by the orifice 12 and remains there, and the sample collection pipe 11
is introduced into the main body 1 of the mixed fluid detection device according to the present invention via the source valve 4 and the sample inlet 2. If a mixed fluid with a specific gravity lower than water, such as petroleum or gas, exists in the cooling water, the upper part of the flow of the cooling water is dammed by the orifice 12 and stagnates, so that the components of the mixed fluid can be efficiently removed. It is collected and reaches the main body 1 of the mixed fluid detection device via the sample collection tube 11, where it is statically separated and accumulated above the water surface, the water level drops, and the detector 9 detects the mixed fluid. When this occurs, the on-off valve 6 opens in response to the detector 9, and the collected mixed fluid is pushed by the water pressure of the cooling water and collected into the mixed fluid recovery device 7 via the discharge pipe 8, and the collected fluid is collected from the detector 9. The contamination detection signal can also send leakage information of the heat exchange system to a central monitoring room or the like via the transmission line 10. The main valve 4 is kept open at all times.

The system shown in FIG. 3 is similar to that shown in FIG. 1, but is a different embodiment in which a signal reset circuit 16 is added in the middle of the originating line 10.

This causes the signal reset circuit 16 to reset the detector 9.
receives an operation signal from the on-off valve 6 to the on-off valve 6, stores and calculates the number of operations per unit time or the operating time per unit time, etc. of the on-off valve 6 using known electrical means, and determines whether the operation is below the desired set value. When only a signal is received, it is erased every unit time, and only when an operation signal exceeding the set value is received, contamination detection information is sent via the transmission line 10 to a contamination signal display device installed in a central monitoring room or the like.

In this embodiment, only when the mixing rate of the mixed fluid in the cooling water is above a certain value, a contamination detection display or a measure against leakage is required, and when the mixing rate is below a certain value, no display or action is required. This is effective in cases where work conditions are unnecessary.

As described above, in the present invention, the fluid leaked into the cooling water of the heat exchange system is efficiently dammed up by the collection orifice 12 and accumulated inside the main body 1 of the detection device, so that very little Since it is possible to detect leaks and detect them at an early stage, and furthermore, the contamination detection information can be sent to a central monitoring room, etc., it is possible to deal with the occurrence of leaks extremely effectively.

Thus, according to the present invention, it is possible to detect oil leakage into the cooling water side in a heat exchanger, which has been considered extremely difficult in the past, at the initial stage of leakage, regardless of whether the fluid to be cooled is liquid or gas. It becomes possible to detect and recover the material at each stage, and it has a huge effect on improving safe operation in the petroleum, chemical, and other equipment industries. In addition, the present invention has the effect that it can be widely applied not only to internal leakage of heat exchangers but also to the collection and detection of mixed fluids that have a specific gravity lower than the original fluid that is mixed without being dissolved in the original fluid flowing in the pipes. It also has

The results of experiments conducted on the first embodiment of the device of the present invention are as follows.

The main body 1 of the detection device is attached to the top of a water pipe with an inner diameter of 100 mm, the collection orifice 12 is made into a hollow shape, and its aperture ratio (d/D) is set to 1/3, and cooling water is injected into the water pipe at 5.4 tons/h. About 1/min as a sample
When cooling water flows into the main body 1, 100% recovery is achieved when (1) kerosene (specific gravity 0.79) is injected at a flow rate of 0.2/min from the S part of the water pipe 500 mm upstream from the sample collection pipe 11. The time until detection was 192 seconds.

(2) Similarly, if air is injected, it can be collected and detected at any minute flow rate; if air is injected at a flow rate of 0.2/min, 100% recovery can be achieved, and the time until detection is
At 75 seconds and 0.5/min, it could be detected in 35 seconds.

[Brief explanation of the drawing]

FIG. 1 shows a first embodiment of the mixed fluid collection and detection device of the present invention applied to a cooling water outlet piping of a heat exchange system, and FIGS. 2A and 2B show embodiments of a collection orifice, each of which is missing. A circular type and an eccentric type are shown, FIG. 2C is a collection orifice with a screw hole according to the present invention, and FIG. 2D is a view taken along the arrow A-A in FIG. 2C.
FIG. 3 shows another embodiment of the detected information processing device. 1... Main body of the contamination detection device, 2... Sample inlet,
3... Water piping, 4... Main valve, 5... Mixed fluid outlet, 6... Open/close valve, 7... Mixed fluid recovery device, 8
...Exhaust pipe, 9...Detector, 10...Outgoing line,
11... sample collection tube, 12... mixed fluid collection orifice, 13... flange, 14... threaded hole section,
15...Cross weir, 16...Signal reset circuit.

Claims (1)

[Scope of Claims] 1. The water pipe is collected through a mixed fluid collecting means provided in the horizontal part of the water pipe and a sample collection pipe provided in the water pipe on the upstream side of the mixed fluid collecting means. A collection device comprising a mixed fluid detection means disposed above and in the shape of a closed container with a built-in detector, the collection means partially damming an upper part of a cross section of the flow of the water pipe. A mixed fluid collection/detection device characterized by an orifice. 2. The mixed fluid collection/detection device according to claim 1, wherein the collection orifice is a circular orifice having a chord portion located above in a cross section of the water pipe. 3. The mixed fluid collection/detection device according to claim 1, wherein the collection orifice is an eccentric orifice that opens eccentrically downward in a cross section of the piping. 4. The mixed fluid collection/detection device according to claim 1, 2, or 3, wherein the collection orifice is an orifice with a threaded hole that can be connected to the end of the sample collection tube. . 5. A method for trapping mixed fluid according to claim 1, wherein the closed container of the mixed fluid detection means is provided with an on-off valve that responds to the detection operation of the detection means at a collected fluid outlet provided at the top. Collection/detection device. 6. Claims 1 to 5, characterized in that the detector built into the mixed fluid detection means is a gas detector, a water level detector, or an interface detector between water and a different liquid. The device for collecting and detecting mixed fluid according to any one of the above items.