JPS58173457A - Method and device for monitoring thermodynamical state of heated liquid in sealed system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for measuring the saturation or sub-saturation thermodynamic level of a heated liquid flowing under pressure in a closed system.

Saturation of the heated liquid is achieved under certain pressure and temperature conditions. There are many practical examples where it is absolutely necessary to know accurate information between the saturated and sub-saturated thermodynamic levels of a liquid, There are many cases where it is difficult to measure. For example, U.S. Patent No. 544750
The primary cooling water system of a pressurized water reactor of the type described in No.
It operates at a pressure of 600@P (514°C). Traditionally, in secondary cooling water systems, the saturation or sub-saturation thermodynamic level has been measured by detecting temperature and pressure values of the liquid to be monitored. For this purpose approximately 300) to 680"F (149 to 56"
0℃) and a temperature measuring device in the range of about 150 to 2570 p.
slm (10,5 to 181 ky/m") are required. However, the large measuring range that has to be covered by these measuring instruments, combined with the type of measurement For that reason,
Undesirable large inaccuracies are unavoidable.

It is therefore an object of the invention to provide a reliable method for measuring the saturated or sub-saturated thermodynamic level of a liquid using a small single measurement of the measuring box H and thus in a manner that considerably reduces the measurement error. The aim is to provide high quality equipment.

According to the invention, the differential pressure measuring transducer is
A 111 fixed tube connects directly to the liquid conduit and a second tube with a sealed end connects to the liquid conduit indirectly.

Extend the sealed end of the indirectly connected measuring tube into the liquid conduit, evacuate the measuring tube, and partially fill the tube with a liquid of the same type as the liquid in the liquid conduit to create a vapor cushion. Make sure to leave space to hold. The pressure difference between the two measurement chambers of the differential pressure measurement transducer is a measure of the thermodynamic level of saturation or subsaturation of the liquid in the conduit.

The vapor cushion created within the sealed end of the measuring tube has a pressure corresponding to the saturation pressure at the temperature of the liquid in the conduit.

The differential pressure value detected by the differential pressure measurement transducer provides information regarding the thermodynamics of the saturated or subsaturated state of the liquid. The degree of measurement error is reduced because the pressure data is compared to phase n by using a single measuring device, a differential pressure measuring device, which requires only a small measuring range.

The sealed end of the measuring tube is sealed to maximize the surface area to volume ratio, thereby allowing more rapid temperature changes of the liquid within the end of the measuring tube to reduce the transient time response of the device. to promote this.

Referring to FIG. 1, a measuring tube 2 is connected to a conduit 1 through which a pressurized heated liquid flows. Is the other end of measuring tube 2 a differential pressure measuring transducer? It is connected to the measurement chamber 5 of No. 4.

Thus, the measuring tube 2 constitutes a continuation tube that communicates the pressurized heated liquid in the conduit 1 to the measuring transducer, and the pressure of the medium (liquid) flowing in the conduit 1 is transferred to the measuring chamber 5.
tell to.

Insert the f7R fixed tube 6 into the measurement chamber 5 of the transducer 4!
Then, the outer end of the measuring tube is made into a sealed end 8. The measurement tube 6 C is filled with the same liquid as the liquid in the conduit 1 up to II7 after previously evacuating the inside thereof. At this time, it is ensured that a space 9 exists within the sealed end B of the measuring tube 6. Space 9 is a sealed measurement tube 6
It is nice that even after the liquid inside has completely heated up, it still has room to accommodate a vapor cushion.

A portion of the liquid-filled portion of the measuring tube 6 is plunged into the liquid flow of the conduit 1, so that the liquid in this plunged portion of the measuring tube 6 flows into the conduit 1.
(which can be as high as 600"F = 516C in this example). Thus, a vapor cushion is created in the space 9. The measurement tube 6
The shape of the portion of the sealed end 8, which is shown only conceptually in the figure, allows rapid heat transfer to the liquid within the sealed end 8 and reduces the time lag of the determined result. Decide to reduce the amount. The pressure reached by the liquid and vapor in the sealed end δ of the tube 6 is the saturation pressure of the liquid flowing in the conduit 1 at its temperature. This pressure value is transmitted to the III fixed chamber 3. Transju? The pressure difference measured between measuring chambers 5 and 4 of 4 is expressed in a known manner and is used as a measure of the thermodynamic level of saturation or subsaturation of the liquid flowing in conduit 1. Therefore, the saturation pressure of the liquid in the measuring tube 6 which is in indirect contact with the liquid in the conduit 1 and at a temperature corresponding to the temperature of the liquid in the conduit 1 is measured and compared with the pressure of the liquid in the conduit 1. be done. K indicates that the liquid in the conduit 1 has reached its saturation pressure when the actual pressure of the liquid in the conduit 1, measured in the chamber 5, is the same as the pressure in the chamber 5. Measurement of the thermodynamic level below saturation provides a reliable means for changing the temperature, pressure or other parameters of the liquid in the conduit 1, e.g. by the reactor operator via the reactor system control information. Give data.

The embodiment of FIG. 2 is a preferred configuration for small diameter pipelines where fluid flow pressure loss is a significant problem. In this example, the pipeline 1a to be monitored is
It extends through the interior of the enlarged sealed end 8 of the measuring tube 6. The pipeline 1a is also provided with a plurality of fins 1 in order to improve the heat transfer from the medium flowing in the pipeline 1a to the sealed end 8 of the measuring tube 6 containing the same medium.
0 is set protrudingly. In this embodiment as well, a saturation pressure is created in the vapor tube 9 in the sealed end 8 of the measuring tube 6 and in the liquid column adjacent thereto, which corresponds to the temperature of the liquid flowing in the pipeline 1a.

This saturation pressure is set as in the case of the embodiment shown in FIG.
It is compared with the actual pressure of the liquid in the pipeline 1a measured in the measurement chamber 3.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram, partially in section, of the apparatus of the invention, and FIG. 2 is a schematic diagram of a modified embodiment of the invention. 1: Conduit 2: Measuring tube 3: Measuring chamber 4: Differential pressure measurement transducer 5: Measuring chamber 6: Measuring tube 8: Sealed end 9: Space (steam seal) 10: Name of Finn agent Motoi Kurauchi Kurahashi summons procedure arrest+E)
F (Method) July 1980, [] Commissioner of the Patent Office Kazuo Wakasugi Display of Tonoichi 1'1 1981 Special Application 52 s
s 1S; ``Supplement 11! Person who does = ff (Relationship with 'I Patent applicant name Braun Berri Reactor G.M.
Same address: 1-Name
(7563) Patent Attorney Akira Kurahashi7. Contents of hli if:, the subject of Z1 Supplement 11;
There is no training in the content)

Claims (1)

[Claims] In an apparatus for measuring the saturated or sub-saturated thermodynamic level of a pressurized and heated wave body, the device being partially filled with the same liquid as the pressurized heating liquid. a first measuring tube having one closed end; the closed end of the measuring tube being plunged into a conduit containing the pressurized heated liquid; The space above the liquid level of 1 m has been previously evacuated so that vapor is formed in the space in contact with the liquid level;
means for transmitting the pressure in the fixed tube to a first measuring chamber; means for transmitting the pressure in the conduit to a second measuring chamber; and a thermodynamic level at or below saturation of the liquid in the conduit. and means for comparing the pressure in the first measuring chamber and the pressure in the second measuring chamber for measurement. 2) The closed end of the 111jii tube has a surface area to volume ratio that is maximized compared to the portion other than the closed end. 3) A device according to claim 1 or 2, wherein the conduit extends through the closed end of the first measuring tube. 4) A method for measuring the saturation or sub-saturation thermodynamic level of a pressurized and heated liquid, comprising: measuring a saturation pressure corresponding to the temperature of said pressurized and heated liquid in a conduit; A method comprising measuring the pressure of a liquid in the conduit and comparing the positive forces to provide an indication of the thermodynamic state of the liquid.