JPS5833148A - Sampling device for high-temperature fluid - Google Patents

Abstract

PURPOSE:To provide a high-temperature fluid sampling device which is protected from thermal shock, by a method wherein a cooler and an economizer are mounted to an inlet side to cool a liquid metal. CONSTITUTION:An economizer 32 is installed between an inlet 10 of an input piping 12 of a sampling device 20 and a normally-driven electromagnetic pump 14, and a cooler 34 whereto a blower 36, driven at a sampling time is connected, is mounted to the outlet side of the pump 14. If the temperature of high-temperature fluid, such as metalic sodium, flowing through the piping 12 reaches in the proximity of the preheating temperature of the sampling device 20, valves 22 and 24 are opened without the occurrence of thermal shock, and a sampling of high- temperature fluid takes place.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot fluid sampling device suitable for sampling hot liquid metals.

Currently, Tet uses U235 or putRQ as fuel.
Some nuclear reactors, such as the experimental fast breeder reactor that breeds J23B to pu239, use liquid metal as a coolant.

However, impurities such as oxygen and hydrogen from the air may mix into the liquid metal during inspections of nuclear reactors, and when the concentration of these impurities increases, the non-rusting steel used for cooling pipes etc. may become chemically contaminated with the impurities. It will react and corrode. Therefore, nuclear reactors that use liquid metal as a coolant are equipped with a liquid metal sampling device (hereinafter referred to as a sampling device) to collect liquid metal from the system as necessary, analyze it for impurities, and manage the impurity concentration. Is going. A system diagram of the Sankyo pulling device is shown in Figure 1.

An electromagnetic pump 14 is provided in an inlet pipe 12 connected to an inlet 10 communicating with a cooling system of a nuclear reactor (not shown in FIG. 1). The downstream side of the inlet pipe 12 is branched into a sampling pipe 16 and a bypass pipe 18. This sampling pipe 16 is provided with a sampling device main body 20, and valves 22 and 24 are installed on the inlet and outlet sides of the sampling device main body, respectively, and a valve 26 is installed in the bypass pipe 18. It is attached. Further, the sampling pipe 16 and the bypass pipe 18 are connected on the outlet side of the valves 24 and 26, and are connected to an outlet 30 to a cooling system of the nuclear reactor (not shown) as an outlet pipe 28.

In the sampling device described above, the electromagnetic pump is normally not driven and the valves 24, 26, 28 are closed, so that no liquid metal flows into the sampling device from the reactor cooling system. And when sampling liquid metal,
Preheat the sampling device main body 20 and each pipe to about 200C, open the valves 22, 24, and 26, and turn on the electromagnetic pump 1.
Drive 4. Therefore, the liquid metal is guided into the inlet pipe 12 from the inlet 10, passes through the sampling pipe 16 and the bypass pipe 18, passes through the outlet pipe 28, and is returned to the cooling system (not shown) from the outlet 30.

Since the liquid metal passing through the sampling pipe 16 passes through the sampling device main body 20, the valves 22 and 24 are closed, and the liquid metal is sealed in a so-called coil, which is a collector (not shown) in the sampling device main body 20, and this coil is cooled. After solidifying the liquid metal, it is taken out of the sampling device main body 20.

However, in the case of a fast breeder reactor, the temperature of the liquid metal (sodium) used as the coolant to be sampled ranges from approximately 150C to 550C. An excessive thermal shock due to the difference is applied to the inlet piping 12, the sampling piping 16, the bypass piping 18, the outlet piping 28, and the sampling device main body 20, which has a drawback that it has a serious adverse effect on the structural integrity of the sampling device. In other words, as shown in Figure 2, when the temperature difference between the sampling device piping temperature (sampling device preheating temperature) and the liquid metal is large, the sampling device piping temperature will increase as soon as the injection of liquid metal into the Su/Prinobu device starts. The rapid rise in temperature and the resulting localized thermal distortion have a significant impact on the sampling equipment. In order to eliminate this drawback, it is also possible to consider a method in which the preheating temperature of the entire sampling device is adjusted to the temperature of the liquid metal to be sampled.

However, it is difficult to preheat the entire sampling device uniformly by raising the temperature around 500C, resulting in temperature distribution (temperature unevenness).
There is also a disadvantage that the preheating equipment cost increases significantly.

The present invention has been made to overcome the drawbacks of the prior art, and aims to provide a high temperature fluid sampling device without thermal shock, in which the sampling device is provided with a cooler and an economizer for cooling the liquid metal. purpose.

The present invention provides a high-temperature fluid sampling device consisting of a pipe line through which high-temperature fluid flows and a sampling device provided on the pipe a, in which a cooler and an economizer are provided on the inlet side of the pipe line, and a high-temperature fluid is collected. A cooler and an economizer cool the sampling device to a preheating temperature of 1, so that no thermal shock is caused to the sampling device.

A preferred embodiment of the high temperature fluid sampling device according to the present invention will be described in detail with reference to the accompanying drawings. Note that the same numbers are given to parts corresponding to those of the conventional sampling device, and the explanation thereof will be omitted.

FIG. 3 is a system diagram of an embodiment of the pan hot fluid sampling device according to the present invention. In FIG. 3, a general economizer 32 is connected to an inlet 10 of an inlet pipe 12 and an electromagnetic pump 14.
A cooler 34 is installed in the inlet pipe 12 on the outlet side of the electromagnetic pump 14. This cooler 34 sends air, which is a cooling medium, into the cooler 34 using a blower 36, and discharges the cooled air, that is, warmed air, to the outside of the cooler 34 through a duct 38. Further, the outlet pipe 28 is connected to the economizer 32 and then to the outlet 30.

Sampling of liquid metal according to the embodiment configured as described above is carried out as follows. In addition, the sampling is
Only the case of liquid metal (IJum) at high temperature (about 500 C) will be explained, and FIG. 4 shows an outline of the temperature change between the sodium and the sampling device in this case.

In the case of this embodiment, the electromagnetic pump 14 is always driven, and when sampling is not performed, the valve 22.2
4 is closed and valve 26 is open. Therefore,
When not sampling, (na) IJum is connected to the inlet piping 1 from the cooling system (not shown) of the reactor through the inlet 10.
2, passed through the economizer 32 and the cooler 34, and sent to the bypass piping 18, further passed through the outlet piping 28, passed through the economizer 32 again, and was returned to the cooling system of the reactor from the outlet 30. However, in this case, since the economizer 32 and the cooler 34 are not operated, the temperature of the sodium is approximately uniform while flowing through the above-mentioned path, and is approximately equal to the temperature of the sodium introduced from the inlet 10. When sampling, first, the twisted sampling pipe 16 and the sampling device main body 20 in the above-mentioned state are preheated to about 200 u, and the economizer 32 and cooler 34 are operated. When cooling of sodium by the economizer 32 and the cooler 34 is started in this way, the population of 1
The sodium derived from 0 is precooled by the economizer 32 and then cooled by the cooler 34, and the temperature is gradually lowered to the preheating temperature of the sampling device main body 20, as shown in FIG. Then, when the temperature of the sodium is controlled to be equal to the preheating temperature of the sampling device main body 20, the valves 22 and 24 are opened, and the sampling device main body 20 is opened.
As shown in FIG. 4, the cooling capacity of the cooler 34 and economizer 32 is weakened to prevent sodium from causing thermal shock to the sampling pipe 16, bypass pipe 18, sampling device main body 20, etc. Raise the temperature gradually. Next, as shown in FIG.
When the temperature becomes approximately equal to the temperature of sodium at 0, the valves 22 and 24, which serve to isolate the sampling device main body 20, are closed, and the coil coil, which is a collector (not shown), in the sampling device main body 20 is cooled. At this time valve 2
6 is open, so the temperature is high) IJum is entrance 1
From 0 to economizer 32, cooler 34, bypass piping 1
8, the outlet pipe 28, the economizer 32, and the outlet 30. Then, when the coil is sufficiently cooled and the liquid IJum is solidified, the coil is taken out of the sampling device main body 20 and sampling is performed. In addition, when the above-mentioned sodium is cooled to the preheating temperature of the sampling device main body 20, the thorium passed from the outlet pipe 28 to the economizer 32 is as follows.
The temperature is slightly raised by the economizer 32 and then the outlet 30
sent to.

When high-temperature sodium is sampled as described above, as shown in Figure 4, the temperature of the sampler main body 20, etc. changes slowly, so excessive thermal shock may not be applied to the sampling device. There is no. In addition, since the sodium to be supped is sealed in the sampling device main body 20 at the same temperature as the sodium at the inlet 10, it is possible to maintain the same composition as the sodium flowing through the reactor cooling system, and more accurately identify impurities. can be analyzed. Furthermore, in this example,
Since there is no need to provide a special device and the operating method of the sampling device does not have to become too complicated, it is possible to provide a simple and highly reliable sampling device.

In the above example, a conventional sampling device is provided with an economizer 32 and a cooler 34, but it may also be combined with a 7-rigging meter as shown in FIG. The plugging meter is a device that measures the temperature at which impurities in the liquid metal precipitate in order to manage the purity of the liquid metal (natium), which is the coolant of the nuclear reactor. , an electromagnetic cylinder 14, an economizer 32, a cooler 34, etc. This embodiment has almost the same structure as the embodiment shown in FIG. 3, but a flow meter 42 is connected to the outlet side of the cooler.
The piping on the outlet side of the L quantity meter 42 is connected to the inlet piping 12 of the sampling device and the plugging piping 44, and the plugging piping 44 is provided with a plugging meter body 40 and a valve 46, and the sampling device is connected to the outlet side of the valve 46. Equipment outlet piping 2
8 is connected to the economizer 32. When sampling liquid metal according to this embodiment, the economizer 32 and cooler 34 of the plugging meter are
The liquid metal is cooled to the preheat temperature of the sampling device by opening valves 22, 24, 26 and closing valve 46 to allow liquid metal to flow through the sampling device. The following operations are almost the same as those described above. According to this embodiment, the electromagnetic pump 14, economizer 32, cooler 34
In addition, a liquid metal temperature control system (not shown) can be shared between the sampling device and the plugging meter, thereby simplifying the equipment and reducing equipment costs.

In addition, in the example described in @, the economizer 32 is replaced by the electromagnetic pump 1.
Although the case where the economizer 32 is provided on the inlet side of the electromagnetic pump 14 has been described, the economizer 32 may be provided on the outlet side of the electromagnetic pump 14. Furthermore, in the above embodiments, the liquid metal suction/pre-knob, which is the coolant of a nuclear reactor, was explained, but it can also be applied to devices other than nuclear reactors, and can also be applied to high-temperature fluids other than liquid metal. can.

As explained above, according to the present invention, an economizer and a cooler are provided in the inlet pipe of the sampling device to cool the high-temperature liquid metal, thereby making it possible to eliminate thermal shock in the sampling device.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional high-temperature fluid sampling device, Fig. 2 is a diagram showing temperature changes during sampling in a conventional high-temperature fluid sampling device, and Fig. 3 is a diagram of a high-temperature fluid bath/bringing device according to the present invention. FIG. 4 is a diagram showing the temperature change during sampling of the sampling device according to the embodiment of FIG. 3, and FIG. 5 is a diagram of another embodiment of the high-temperature fluid sampling device according to the present invention. be. 12...Inlet piping, 16...S/purifugu piping, 1
8... Bypass piping, 20... Su/prifugation device main body, 28... Outlet piping, 32... Economizer, 3
4...Cold 0 No. 212 Il Fig. 4 X 5. n 34 /4 32

Claims (1)

[Claims] 1. A high-temperature fluid sampling device comprising a pipe through which high-temperature fluid flows and a sampling device installed in the pipe, characterized in that a cooler and an economizer are provided on the inlet side of the pipe. Fluid sampling device.