JP4585488B2 - Facility method and device for liquid quality sensor - Google Patents

Description

  The present invention relates to a liquid quality sensor facility method and a liquid quality detection device for detecting a change in liquid quality such as a liquid leak from a condenser of a thermal power generation facility, for example, a device through which seawater flows.

  Conventionally, in a thermal power generation facility or the like, steam generated in a boiler is cooled and condensed by a condenser and circulated and used as boiler water (pure water). Here, a cooling pipe for cooling the steam in the condenser is provided, and seawater for cooling flows through the cooling pipe. However, when a crack or the like occurs in the cooling pipe, seawater leaks from there. Then, it is mixed in the condensed boiler condensate, and the condensed water is mixed with salt to corrode various pipes. Therefore, various seawater leakage detection devices have been developed to check for seawater leakage from the condenser (see, for example, Patent Document 1).

  However, in the case of the above-described prior art, since the boiler water condensed at the lower part of the condenser is collected and liquid analysis is performed, the problem is that the leaked seawater is significantly diluted with the boiler water and the detection sensitivity is reduced accordingly. is there. In addition, the actual seawater leak is caused by cracking a part of the condenser, but in the case of the above technology, it is impossible to specify which part of the condenser is leaking, and it takes time to deal with it. ,There's a problem.

  Therefore, the present applicant has previously proposed a leak detection apparatus as shown in FIG. 9 (Patent Document 2). As shown in FIG. 9, the conventional leak detection device is installed below the target device 200 for liquid leak detection, and in a first direction parallel to one direction and a second direction intersecting with the one direction. A number of metal wires 2A to 2H, 3A, 3B that are arranged and spaced apart from each other, and values of electrical conductivity between any one of the metal wires 3A in the first direction and the metal wires 2D in the second direction, and then And a leak position specifying means 201 for specifying the leak position of the target device based on the crossing position of the metal wires 3A and 2D (see FIG. 1 of Patent Document 2).

JP 2001-141596 A JP 2004-144708 A

  However, the leak detection apparatus according to Patent Document 2 is installed below the leak detection target device, and tries to detect a change in resistance between electrodes due to a difference in electrical conductivity when seawater and condensed water fall. Yes. In this method, seawater diluted with water is mixed in compared to the change in electrical characteristics between the electrodes when dripping water enters between the electrodes and when it does not (space or water vapor exists between the electrodes). In order to detect seawater dripping with small changes in electrical characteristics due to the sensor, it is necessary to stretch the sensor in a plane and very densely, and it is difficult to detect scattered seawater There's a problem.

  In view of the above problem, the present invention provides a facility method and a liquid quality detection device for a liquid quality sensor that can stably detect liquid leakage such as seawater leak of a condenser with high sensitivity. Let it be an issue.

The first invention of the present invention for solving the above-described problems uses a cable-like liquid quality sensor that detects a change in the liquid quality in the solution in the solution tank with respect to seawater leakage from the condenser. The liquid quality sensor is provided in the longitudinal direction of the solution tank, and is sequentially shifted in the width direction of the solution tank while being folded at the end portion.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a liquid quality sensor facility method according to the first aspect, wherein the change in liquid quality is caused by the fall, intrusion or diffusion of seawater into the solution .

The third invention is the invention of the first or second, the liquid electrolyte sensor, a central conductor core like a part of which is exposed over the axial cross-section a rectangular shape around a core-like conductor Alternatively, it is a facility method for a liquid quality sensor, comprising a plurality of circular solid conductors or a net-like outer conductor disposed through a hollow insulator.

A fourth invention is a cable-like liquid quality sensor comprising a pair of conductors, on the basis of a pulse voltage is applied between the pair of conductors to the time until the reflected voltage returns between each conductor condensate And a liquid quality specifying device for specifying the liquid quality change position of the solution in the solution tank with respect to the seawater leakage from the water vessel, and the liquid quality sensor is provided in the longitudinal direction of the solution tank. The liquid quality detecting device is provided by being sequentially shifted in the width direction of the solution tank while being folded at the end.

According to a fifth invention, in the fourth invention, the liquid quality sensor has a core-shaped central conductor partially exposed in the axial direction, and a rectangular or circular cross section around the core-shaped conductor. The liquid quality detecting device includes a plurality of net-like outer conductors disposed via a plurality of solid or hollow insulators.

A sixth invention is the liquid quality detecting device according to the fourth or fifth invention, wherein the liquid quality sensor is installed at a position 200 to 300 mm below the water level reference value.

A seventh invention is the invention according to any one of the fourth to sixth inventions, wherein the liquid quality sensor is supported by an L-shaped angle having pores on support columns installed at predetermined intervals in the solution tank, The liquid quality detecting device is characterized in that an exposed surface is provided toward the fine pore side.

  According to the present invention, it is possible to reliably install a liquid quality sensor that detects liquid quality, and to reliably detect a change in liquid quality over a wide range, for example, to stabilize seawater leak in a condenser with high sensitivity. Can be detected.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

A liquid quality detection apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram of a liquid quality detection apparatus according to an embodiment.
As shown in FIG. 1, the liquid quality detection device according to this embodiment applies a pulse voltage between a liquid leakage detection sensor 10 that is a cable-shaped liquid quality sensor including a pair of conductors and the pair of conductors. And a liquid quality position specifying device (measuring instrument) 22 for specifying the liquid quality change position on the basis of the time until the reflected voltage returns between the conductors. The liquid quality sensor is a solution tank. In addition to being provided in the longitudinal direction of 20, the facility is provided by sequentially shifting in the width direction of the solution tank 20 while turning back at the end.
In FIG. 1, reference numeral 21 denotes a manhole, which is provided with a fixing portion 21 a between the signal line 23 connected to the measuring instrument 22 side and the liquid leak detection sensor 10. Reference numeral 31 denotes a condenser cooling pipe which cools boiler steam (not shown) with seawater (not shown).

FIG. 2 is a plan view of FIG. 1. In this embodiment, a solution tank is formed from two chambers A and B, and a liquid leak detection sensor 10 is separately provided in each chamber in the longitudinal direction. The quality sensor is provided, and the quality sensor is sequentially shifted in the width direction of the solution tank 20 while being folded at the end.
Thus, the whole can be monitored by providing a long straight portion in the longitudinal direction.
In the present embodiment, the A chamber and the B chamber are measured using separate liquid quality specifying devices (measuring instruments) 22A and 22B, but the present invention is not limited to this. The chamber and the room B may be provided with one liquid quality sensor 10 and measured by one liquid quality position specifying device (measuring instrument).

  As shown in FIG. 3, the liquid leak detection sensor 10 includes a central conductor 11 that is a core-shaped conductor partially exposed in the axial direction, and a rectangular or circular cross section around the central conductor. The outer conductor 12 is a net-like outer conductor 12 disposed via a plurality of solid or hollow insulators 13, and a substantially V-shaped groove 14 is formed in the insulator 13, and a part of the center conductor 11 is formed. An exposed portion 15 that is exposed is formed.

  As shown in FIG. 4, when installing the liquid leak detection sensor 10 in the solution tank 20, the L-shaped angle 26 is fixed to the support columns 24 installed at predetermined intervals with the U-shaped bolts 27, Drop prevention supports 28 are arranged at predetermined intervals to prevent the L-shaped angle from falling.

Moreover, as shown in FIG. 4, the facility position of the liquid leak detection sensor 10 is set to a position below 200 to 300 mm from the water level reference value (NWL).
This is because there is no influence on fluctuations in water depth during operation, and reliable measurement is performed.

  In addition, as shown in FIG. 5, the L-shaped angle 26 has a pore 26a, and the liquid leak detection sensor 10 is installed so that the exposed portion 15 is positioned in the hole of the pore 26a. Yes. Thereby, accumulation of dust or the like in the exposed portion 15 is prevented, and reliable liquid leakage detection is performed.

  Further, as shown in FIG. 6, in the width direction when installing the liquid leak detection sensor 10, an L-shaped angle 26 is supported by a T-shaped steel 25 provided from the bottom surface of the solution tank 20 via a fixed clamp 29. I am doing so.

  The bending radius at this time is preferably about 300 mm so that the shape of the cable can be maintained.

  7-1 and 7-2 show examples of facilities of the liquid leak detection sensor 10. In addition, the layout of the facility example is not limited to these, as long as the liquid quality sensor is installed in the longitudinal direction of the solution tank and the facility is sequentially shifted in the width direction of the solution tank while being folded at the end. Any of them may be used.

In FIG. 1, a liquid leak detection sensor 10 and a liquid quality position specifying device (measuring instrument) 22 are connected by a signal line 23, information processing is performed on a detection result, and the result is displayed on a monitor as a warning.
This display indicates the signal intensity, the presence / absence of liquid leakage from the signal intensity, and the location thereof.

FIG. 8 is an example showing a TDR measurement test result when the detection of seawater leak is simulated using the liquid quality detection device of FIG.
In the test, a section of about 10 m of the liquid leak detection sensor 10 is spirally installed in a 750 × 750 mm container, submerged in circulating pure water, and TDR measurement is performed when seawater is locally dripped. went.

  As shown in FIG. 8, it was found that a change in impedance occurred in a part (4 m to 5 m and 7 m to 8 m) of the liquid leak detection sensor immersed in water, and the change increased with time.

  In general, a condenser is a unit in which a structure in which a thin tube extending in the longitudinal direction is bent 180 degrees in a direction perpendicular to the same on a single plane and then folded back in the longitudinal direction is defined as one unit. A large number of layers are stacked in the direction. And the cooling seawater which flowed in from the entrance side of a thin tube cools the boiler vapor | steam sprayed on the outer side of a condenser, makes it condensed water, and flows out from the exit side of a thin tube. The condensed water is stored in a solution tank installed below, and then reused as circulating water.

  In such a plurality of thin tubes, for example, when leakage due to seawater corrosion occurs, seawater leaks from the corroded portion and falls into the solution tank. Since the solution tank is only condensed water, the liquid leak detection sensor usually shows an almost constant value. You can identify leaks.

  In the above embodiment, the condenser is exemplified as the liquid leakage target device. However, the present invention is not limited to this, and the liquid leakage detection sensor according to the present invention is applied to the liquid having different properties from the liquid leakage. It is possible to accurately detect leakage by installing and measuring the signal intensity in the TDR device.

  As described above, the liquid quality detection device of the present invention can reliably detect liquid leakage over a wide range, and is suitable, for example, for detecting seawater leak of a condenser with high sensitivity and stability. .

It is the schematic of the liquid quality detection apparatus which concerns on a present Example. It is a top view of the liquid quality detection apparatus which concerns on a present Example. It is sectional drawing of the other liquid leak detection sensor which concerns on a present Example. It is a perspective view of the facility example of the liquid leak detection sensor which concerns on a present Example. It is a support cross-sectional schematic diagram of the liquid leak detection sensor which concerns on a present Example. It is a support plane schematic diagram of the liquid leak detection sensor which concerns on a present Example. It is a perspective view of the example of a layout of the liquid leak detection sensor which concerns on a present Example. It is a perspective view of the other layout example of the liquid leak detection sensor which concerns on a present Example. It is a figure which shows the TDR measurement test result at the time of simulating the detection of seawater leak. It is a figure which shows the TDR measurement test result of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid leak detection sensor 11 Center conductor 12 Outer conductor 13 Insulator 14 Groove 15 Exposed part 20 Solution tank 22 Liquid quality location apparatus 26 L-shaped angle

Claims (7)

Using a cable-like liquid quality sensor that detects a change in the quality of the solution in the solution tank against seawater leakage from the condenser, the liquid quality sensor is provided in the longitudinal direction of the solution tank, and an end A facility method for a liquid quality sensor, wherein the facility is disposed by sequentially shifting in the width direction of the solution tank while turning back at the section. In claim 1,
A facility method for a liquid quality sensor, wherein the change in the liquid quality is caused by the fall, penetration or diffusion of seawater into the solution . In claim 1 or 2 ,
The liquid quality sensor includes a core-shaped central conductor partially exposed in the axial direction, and a plurality of solid or hollow insulators having a rectangular or circular cross section around the core-shaped conductor. A facility for a liquid quality sensor, comprising a net-like outer conductor disposed between the two. A cable-like liquid quality sensor comprising a pair of conductors;
Based on the time from when a pulse voltage is applied between the pair of conductors until the reflected voltage returns between the conductors, the liquid quality change position of the solution in the solution tank with respect to the seawater leakage from the condenser And a liquid quality location device for identifying
The liquid quality detection apparatus according to claim 1, wherein the liquid quality sensor is provided in the longitudinal direction of the solution tank and is sequentially shifted in the width direction of the solution tank while being folded at the end. In claim 4 ,
The liquid quality sensor includes a core-shaped central conductor partially exposed in the axial direction, and a plurality of solid or hollow insulators having a rectangular or circular cross section around the core-shaped conductor. A liquid quality detection device comprising a net-like outer conductor disposed in a line. In claim 4 or 5 ,
The liquid quality detection apparatus according to claim 1, wherein the liquid quality sensor is installed at a position below 200 to 300 mm from a water level reference value. In any one of Claims 4 thru | or 6 ,
The liquid quality sensor is supported by an L-shaped angle having pores on support columns installed at predetermined intervals in the solution tank, and an exposed surface is provided toward the pore side. Liquid quality detection device.

Images