JPS6129656B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydrogen detection device that can continuously measure the concentration of hydrogen contained in a gas.

A small water leak in a steam generator in a sodium metal-cooled fast reactor plant can damage adjacent heat transfer tubes and cause a large-scale leakage accident. Therefore, it is necessary to quickly detect small water leaks and prevent accidents from occurring. To detect this water leak, a detection method that is highly sensitive and can be used over a long period of time is required. Various methods have been considered for detecting water leaks, but among them, a method that detects hydrogen released into the cover gas during the reaction between sodium and water is suitable. To detect this hydrogen, a hydrogen detection device consisting of a diffusion membrane section, a vacuum gauge, and an exhaust device is used. This device is constructed as shown in FIG. That is, a second flange 2 is installed horizontally on the wall 1 of the cover gas section of the steam generator or the test tank, and a cylindrical shape through which the gas to be measured, for example, a mixed gas of argon and hydrogen flows, is installed on the second flange 2. Container 3 is fixed. Further, power supply terminals 20, 22 for the first heat source 9 and second heat source 8, and signal output terminals 19, 21 for the temperature detection elements 11, 10 for controlling the heat source are attached to the upper part. There is. A layout diagram of the terminals is shown in FIG. Furthermore, a tubular body 6 made of stainless steel, for example, is attached to the second flange 2 through the upper end opening 4 of the cylindrical container 3 .
A sleeve-shaped diffusion membrane portion 7 is connected to the tubular body 6 from the center downward. Diffusion membrane part 7
As such, hydrogen is selectively permeated. Palladium, iron, nickel, etc. are used. A heater 8 and a heater 9 are installed above and below this diffusion film portion 7, that is, inside the tubular body near the upper end opening 4 of the cylindrical container 3 and the lower end opening 5 of the cylindrical container 3. . The heaters 8 and 9 are adjusted to a predetermined temperature by thermocouples 10 and 11 and temperature control devices 12 and 13. Connections are made using heater terminals 20, 22 and thermocouple terminals 19, 21 attached to the upper part of the second flange 2. The sensor 14 is controlled by a hydrogen detector controller 16. In this device, when the gas to be measured flows in from the lower end container portion 5 of the cylindrical container 3, hydrogen is transferred to the diffusion membrane portion 7.
The hydrogen is transmitted through the sensor 14, that is, the hydrogen detecting section 17 detects the hydrogen. The hydrogen detection section 17 incorporates a detection section that measures, for example, ion current and degree of vacuum, and a controller 16 such as an ion pump controller and a vacuum gauge controller.

In this conventional hydrogen detection device, as described above, the pipe 15 is located at the center of the upper part of the second flange 2.
Heater terminals 22, 20 and thermocouple terminals 19, 21 are attached around it, and a tubular body 6 and a cylindrical container are supported at the bottom. Therefore, if even one of the heaters 8, 9 and thermocouples 10, 11 breaks down, it is necessary to remove the second flange and replace all of the heater thermocouples, etc., and the reliability of the heaters, thermocouples, etc. becomes a problem. Summer. Also the second
When the flange 2 is removed, it is very difficult to remove it because the cylindrical container 6 and the like are supported at the bottom, which poses a problem when performing maintenance.

The first object of the present invention is to provide hydrogen detection in which the heater and thermocouple for the first heating source and the heater and thermocouple for the second heating source can be separated and replaced, taking into consideration the lifespan of the heater and thermocouple. is to get the equipment.

A second object of the present invention is to provide a hydrogen detection device in which the flange portion is easy to remove and maintenance can be performed easily.

That is, the present invention includes a cylindrical container, a tubular body having a flow path in which a gas to be measured flows from one end to the other end, and a diffusion membrane portion that permeates hydrogen contained in the gas to be measured; A hydrogen detection section connected to the tubular body, a first heating source and a second heating source provided in the flow direction of the gas to be measured and before and after the diffusion membrane section, and a first heating source and a second heating source connected to each of these heat sources, respectively. A temperature control unit, a temperature detection element for controlling the temperature control unit, a terminal for power supply and signal extraction of the first heating source and the temperature detection element for control are installed and placed on the wall of the test chamber. Hydrogen detection characterized by comprising a first flange, and a second flange mounted on and attached to the first flange and provided with terminals of the second heating source and a temperature sensing element for controlling the second heating source. It is a device.

Hereinafter, this invention will be explained in detail with reference to an embodiment shown in FIG. In FIG. 3, the same parts as in FIGS. 1 and 2 are indicated by the same reference numerals, and the explanation of the overlapping parts is omitted. That is, the present invention includes a flow path 18 in which a gas to be measured flows from a lower end opening 5 toward an upper end opening 4 in a cylindrical container 3, and a gas contained in the gas to be measured disposed within this flow path 18. A tubular body 6 having a diffusion membrane section 7 that transmits hydrogen, a first heat source 9 and a second heat source 8 provided in the flow direction of the gas to be measured and before and after the diffusion membrane section, respectively, and each of these heat sources. 8, each of these heating sources 8, heating terminals 20, 22 connected to each of these heating sources 8, 9, and temperature control devices 12, 13 connected thereto, from which signals for controlling these can be obtained. temperature sensing element 10,
For example, thermocouples 11 are connected to temperature control devices 12 and 13 through thermocouple terminals 21 and 19.
It is connected to the. Further, since the hydrogen detection device can be attached to the wall 1 of the test chamber, the first flawaage 23 is placed on the wall 1 and fixed with bolts so that it does not protrude from the lower surface of the wall 1. Similarly, the second flange 2 is placed on the first flange 23.
is placed and fixed with bolts so that it does not protrude from the bottom surface of the first flange 23.

Here, in this invention, the terminals of the heater 9 for the first heat source and the thermocouple are attached to the first flange 23 to support the cylindrical container 3, and the heater and thermocouple for the second heat source 8 are attached to the second flange 2. Terminals were attached to support the tubular body 6. In this way, according to the present invention, the heat source heater and thermocouple can be separated and replaced. Furthermore, since the cylindrical container 3 and the tubular body 6 can be separated and removed, the flange portion can be easily removed and maintenance can be easily performed.

For example, when replacing the diffusion membrane section 7, it is now possible to replace the second flange 2 very easily without having to remove the first heating source 9, cylindrical container 3, etc. Furthermore, even if the heater of the second heating source 8 is disconnected, it is now possible to replace it in the same manner as described above.

As described above, according to the present invention, by providing two stages of flanges that close the upper end of the cylindrical container, it is possible to separately attach the heater and thermocouple for the heat source to each flange. The heaters and thermocouples for the first and second heating sources can be separated and replaced.In addition, conventionally, when a hydrogen detection device was used in a sodium atmosphere, sodium would stick to the threaded part of the flange, causing damage to the flange. It was difficult to remove. On the other hand, in the present invention, since the threaded portion of each flange portion is not exposed in the sodium atmosphere, the cylindrical container 3 and the cylindrical body 6 can be separated and removed, and the flange portions etc. can be easily removed. Therefore, maintenance becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a device layout diagram partially showing an example of a conventional hydrogen detection device in block form, Fig. 2 is a plan view showing the arrangement relationship of terminal parts in Fig. 1, and Fig. 3 is a hydrogen detection device according to the present invention. 1 is a longitudinal sectional view partially showing an embodiment of the device in block form; FIG. 1... Test chamber wall, 2... Second flange, 3...
... Cylindrical container, 4 ... Upper end opening, 5 ... Lower end opening, 6 ... Tubular body, 7 ... Diffusion membrane part, 8 ... Second
Heat source, 9... First heat source, 10, 11... Temperature detection element, 12, 13... Temperature control device, 14...
...Sensor, 15...Pipe, 16...Hydrogen detector controller, 17...Hydrogen detector, 18...
Channel, 19, 21...Thermocouple terminal, 20, 22
...Heating heater terminal, 23...First flange.

Claims (1)

[Claims] 1. A cylindrical container, a tubular body having a flow path in which the gas to be measured flows from one end to the other end, and a diffusion membrane portion that permeates hydrogen contained in the gas to be measured; A first heat source and a second heat source provided in the flow direction of the gas to be measured and before and after the diffusion membrane part connected to the hydrogen detection part, and a temperature control part respectively connected to each of these heat sources. , a temperature sensing element for controlling the temperature sensing element, and a first heating source and a terminal for supplying power to the temperature sensing element for controlling the heating source and for taking out a signal, and mounted on the wall of the test chamber. A hydrogen detection device comprising: a flange; and a second flange mounted on the first flange and provided with terminals of the second heating source and a temperature sensing element for controlling the second heating source.