JPS5851215B2 - Kouatsusuichiyuuno - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the total amount of gas dissolved in high-pressure water or the amount of a specific gas such as hydrogen.

Regarding the measurement of the amount of gas dissolved in high-pressure water, for example, in the primary cooling water of pressurized water nuclear power plants, hydrogen gas is added to suppress the generation of oxygen due to radiolysis of the water. A relatively large amount of hydrogen gas is dissolved in the gas, and it is essential to measure the gas amount because it is necessary to always know the appropriate amount of hydrogen gas.

Conventionally, this type of gas amount measurement method involves collecting a primary cooling water sample in a sample water vessel, transporting it to the laboratory, connecting a gas sampling device to the vessel via a valve, and placing the sample inside the device in advance. After removing the air using a vacuum pump, the valve of the sample water vessel is opened to extract and collect the gas dissolved in the sample water in the vessel into the sampling device.The sampling process is extremely complicated and the operation is troublesome. there were.

Furthermore, with conventional measurement methods, especially when measuring dissolved gases in the primary cooling water of a pressurized water nuclear power plant, there is a risk that measurement personnel may be exposed to radiation when handling sample vessels.

Therefore, as a result of extensive research, the inventor connected the sample water collection vessel to the high-pressure water supply system via a large mouth valve and an outlet valve, and connected branch pipes to the inlet and outlet sides of this sample water collection vessel. A gas amount analysis system consisting of a surge vessel, an analyzer, and an air pump to analyze and measure only specific gas components is connected via a valve to a billet that can measure the total amount of gas dissolved in high-pressure water. By connecting via a It turned out to be possible.

Accordingly, a general object of the present invention is to provide a measuring device that can quickly measure the total amount of gas and the amount of specific gas dissolved in high-pressure water with simple operations.

The main object of the present invention is to consist of a high-pressure water supply system and a gas amount analysis and measurement system that is partially common to the high-pressure water supply system, and a sample water collection vessel is provided in the common system path. A valve device is provided on the inlet side and an outlet side of the connected vessel, respectively, and a combination unit of a billet, a pressure gauge, an air pump, and an analyzer is provided through the valve device in the gas amount analysis measurement system. An object of the present invention is to provide a device for measuring the amount of dissolved gas in high-pressure water.

Next, embodiments of the gas amount measuring device according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a sample water collection vessel, and an inlet pipe 12 and an outlet pipe 14 of this vessel 10 are shown.
A high-pressure water supply system 16 is connected to each via an inlet valve 18 and an outlet valve 20.

Branch pipes 22 and 24 are connected to a portion of the inlet pipe 12 and outlet pipe 14 of the vessel 10, respectively, and a billet 28 is connected to the branch pipe 22 communicating with the inlet pipe 12 of the vessel 10 via an on-off valve 26, and a stopper is connected. Pressure gauge 3 via valve 30
2 and further connect the drain pipe 36 via the drain valve 34.
Connect.

Further, branch pipes 22 each communicating with the vessel 10
An on-off valve 38, 40 is provided at each of the ports 24, and between these, the surge vessel 42, gas analyzer 44, and air pump 4 are connected.
A gas amount analysis system 48 consisting of 6 is connected.

Note that this gas amount analysis system 48 is provided with a gas release valve 50 for appropriately releasing gas within the system.

Next, the operation of the gas amount measuring device configured as described above will be explained.

First, when measuring the total amount of gas dissolved in high-pressure water, the on-off valves 38 and 40 for communicating the sample water collection vessel 10 side and the gas amount analysis system 46, the inlet on-off valve 26 of the billet 28, and the drain All the drain valves 34 of the pipes 36 are closed, and the inlet valve 18 and outlet valve 20 of the sample water collection vessel 10 are opened to circulate high-pressure sample water into the vessel 10.

After sufficiently circulating the sample water into the vessel 10, Yamaguchi valve 2
0 and then close the large mouth valve 18, the sample water flows into the vessel 10 and the valve 3B under high pressure.
, 40, 26, 34, 18° It fills the pipes closed at 20°.

Thereafter, when the inlet opening/closing valve 26 of the billet 28 is gradually opened, the high-pressure sample water returns to normal pressure and expands to some extent, causing the water level in the billet 28 to rise.

Note that it is preferable to provide a trap 52 in front of the inlet opening/closing valve 26 of the biulet 28 in order to prevent the gas in the sample water from being released outside the system as much as possible.

In this way, when the pressure of the sample water in the sample water collection vessel 10 becomes approximately equal to the atmospheric pressure, the gas dissolved in the sample water separates and replaces the water in the upper part of the vessel 10, and as a result, the gas in the sample water collection vessel 10 is Raise the water level.

Therefore, by measuring the amount of expansion of the sample water in this case using the biulet 28, the total dissolved gas amount TG can be determined by the following equation.

TG=E-Wc+D...-" (1) E: Total expansion amount, Wc: Expansion amount due to compressibility of water, D = Dissolved gas amount in water at atmospheric pressure. Wc is the pressure of the sample water measured by the pressure gauge 32. Since it can be measured by , it can be easily obtained by calculation.

For example, 155! When the pressure changes from 9/cmG to atmospheric pressure, Wc becomes 6.6cmG/l.

In addition, D is 16.7 ml/t at 25°C in the case of air.

17.5rnl for hydrogen! / , 1, and if 1/2 of air and 1/2 of hydrogen are mixed, it can be said that about 17 m/2 is contained.

Furthermore, E can be measured with billet 28.

In this way, the total dissolved gas amount TG in the sample water can be easily determined by calculation.

Next, when measuring only the amount of a specific gas such as hydrogen from the total amount of gas dissolved in the sample water, immediately after the above-mentioned total gas amount measurement operation, the inlet opening/closing valve of the billet 28
6 and the gas release valve 50 of the gas analysis system 48 are closed, the on-off valves 38 and 40 for communicating the sample water collection vessel 10 and the gas analysis system 48 are opened, and the air pump 46 is operated. do.

As a result, a mixed gas of the air present in the system 48 and the gas extracted into the sample water collection vessel 10 circulates within the gas amount analysis system 48.

In this way, the amount of a specific gas present in the gas mixture is measured by the analyzer 44 provided in the gas amount analysis system 48.

So, for example, when trying to measure the amount of hydrogen gas,
A hydrogen analyzer is used as the analyzer 44.

In this case, the hydrogen gas concentration in the entire analysis system 48 is the sum of the hydrogen gas concentration in the gas extracted with air and the hydrogen gas concentration dissolved in the water in the sample water collection vessel 10. The analysis values indicated by Total 44 are only those extracted with air.

Therefore, the amount of hydrogen gas dissolved in water is 2
It is 17.5 Wll/l at 5°C, and this value is proportional to the partial pressure when mixed with other gases, such as air, and this partial pressure is proportional to the indicated value of the hydrogen analyzer. The amount of dissolved hydrogen gas is 17.5%/lXV%.

Therefore, the amount of hydrogen gas in the entire analysis system 48 is determined by the following equation.

V”/, 1 + (17,5”/z X V%)
``'' (2) Note that when analyzing and measuring other specific gas components, the measurement can be easily achieved by replacing the analyzer as appropriate.

After completing all of the above gas amount measurements, the drain valve 34 is opened to drain all the sample water in the system, and the gas release valve 5
0 can be opened to exhaust the gas in the system and prepare for the next analytical measurement.

In this case, it is preferable to operate the air pump 46 as appropriate to promote drainage and exhaust in the system.

According to the device of the present invention, the measurement of the total amount of gas dissolved in high-pressure water, the extraction of the gas dissolved in high-pressure water, and the analysis and measurement of the specific amount of gas contained in this gas are all performed by opening and closing the valve device. This can be easily achieved with just one.

In addition, not only can the opening and closing of these valve devices be easily controlled by remote control, but it is also possible to automatically control the opening and closing timing of the valve devices by setting a time limit according to the measurement operation procedure. Recording measurements can also be performed automatically using automatic measuring equipment.

Therefore, by automating such operations, it can be suitably used, for example, for analysis and measurement of radioactive sample water such as primary cooling water of a nuclear power plant.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a measuring device according to the present invention. 10...Sample water collection vessel, 12...
・Inlet pipe, 14... Outlet pipe, 16...
High pressure water supply system, 18... Inlet valve, 20...
...Outlet valve, 22, 24... Branch pipe, 26...
...Opening/closing valve, 28...Billet, 30.
...Stop valve, 32...Pressure gauge, 34...
...Drain valve, 36...Drain pipe, 38,4
0...Opening/closing valve, 42...Surge vessel, 44...Gas analyzer, 46...Air pump, 48...Gas amount Analysis system, 50...
...Gas release valve, 52...Trap.

Claims (1)

[Claims] 1 Consisting of a high-pressure water supply system and a gas amount analysis and measurement system that is partially common to the high-pressure water supply system, a sample water collection vessel is provided in the common system path, and the vessel connected to the high-pressure water supply system is Valve devices are installed on the inlet and outlet sides, respectively.
An apparatus for measuring the amount of dissolved gas in high-pressure water, characterized in that the gas amount analysis measurement system is provided with a billet, a pressure gauge, a combination unit of an air pump, and an analyzer, each via a valve device.