JPS6243528A - Mixing type apparatus for measuring temperature of fluid - Google Patents

Abstract

PURPOSE:To make it possible to easily and positively measure the average temp. of matter to be measured, by providing the cover mounted on the pipe body constituting the flow passage of a fluid in a fluid-tight state so as to be protruded to the flow passage and the orifice mounted in the interior of the cover. CONSTITUTION:A cover 2 is mounted on a primary main cooling pipe 105 so as to pass through the wall of the piping 105 and be inserted in the mount hole 3 of said piping 105. An orifice plate 8 is mounted in the interior of the cover 2 and a plurality of fluid inflow ports 16 are formed in the wall of the leading end side 11 of the cover 2 in a piercing state. A part of the cooling material flowing through a flow passage 5 flows in a plenum chamber 12 from the inflow ports 16 of the cover 2. The cooling material 4 passing through the inflow ports 16 shows different temps. according to the positions of the inflow ports 16 but the flowing in streams are mixed by the vortex stream generated in the chamber 12. The cooling material 14 mixed in the chamber 12 flows in a temp. measuring chamber 14 through the orifice 15 of the orifice plate 8 and collected to one place when passing through the orifice 15 to further promote mixing. The cooling material flowing in the temp. measuring chamber 14 is subjected to the measurement of temp. by the temp.-sensitive part 21 of a temp. measuring device 18 and flows out from a fluid outflow port 17 to be returned to the flow passage 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid temperature measuring device for measuring the temperature of a fluid.

Such fluid temperature measuring devices are used in various chemical plants and primary cooling systems of pressurized water reactors.

[Prior Art] Fig. 4 shows a system diagram of a primary cooling system of a pressurized water reactor (PWR). The primary coolant flowing out of the reactor vessel 101 passes through the primary system main coolant pipe 105 and enters the steam generator 103 . The primary coolant discharged from the steam generator 103 is sent to the pump 1.
04 and return to the reactor vessel 101. Further, the primary system is pressurized by a pressurizer 102.

As a method of measuring the coolant temperature of such a primary system,
In a conventional plant, a steam generator bypass system 108 is provided that bypasses the steam generator 103, and a thermometer 107 such as a resistance thermometer is installed in the middle of the system.
7, the temperature of the coolant in the steam generator bypass system 108 is measured to estimate the temperature of the primary coolant in the primary main coolant pipe 105.

FIG. 5 shows the coolant intake of the steam generator bypass system 108.

A large number of intake pipes 109 are installed penetrating the wall of the piping 113 of the steam generator bypass system 108, and each intake pipe 109 is provided with several intake ports 110. Primary coolant 111 enters intake pipe 109 through intake port 110 . The coolant that has entered through the multiple intake pipes 109 joins one pipe 112, and then the temperature is measured by a thermometer 107.

FIG. 6 shows the steam generator bypass system 108 of the intake pipe 109.
The details of the method of attachment to the pipe 113 are shown below. That is,
The intake pipe 109 is pushed into a hole made in the pipe 113 from the outside of the pipe 113, and is joined by welding 114.

The primary coolant in the primary main coolant pipe 105 has a temperature distribution within a cross section perpendicular to the axial direction of the pipe. The difference between the highest and lowest temperatures is about 10% of the temperature difference between the entrance and exit of the reactor vessel 101.

Therefore, in order to measure the temperature difference between the entrance and exit with an accuracy of within about 10%, it is necessary to measure the temperature distribution by averaging it in some way. For this reason, conventionally, a large number of intake pipes 109 are arranged in the same plane, and each intake pipe 109 is
09 is provided with multiple intake ports 110.

[Problems to be Solved by the Invention] Such a conventional cold member temperature measuring device requires the steam generator bypass system 108, which increases the number of systems and equipment costs. Since the primary coolant is flowing through the bypass system 108, the surrounding tI
iC) The radiation level is high, and it is thought that the radiation exposure of workers during brand maintenance, inspection, etc. will increase.There is a desire to develop a technology to solve this problem.

Furthermore, as shown in Japanese Patent Application Laid-open No. 59-171823, a flow guide is used to collect coolant collected with a scoop.
It has also been proposed to conduct a temperature measurement at that point, thereby eliminating the steam generator bypass system, but in this case the flow in the flow guide is only concentrated at one point, and the flow Since the mixing of the primary coolant is not performed, a stratified temperature distribution exists in the flow, and the average temperature of the primary coolant cannot be measured. Furthermore, in the method using this flow guide, since the structure of the flow guide is larger than the intake pipe 109 shown in FIG. 6, it is impossible to remove the intake pipe 109 and install a flow guide in its place. Therefore, there is also the problem that a currently operating plant using the intake pipe 109 cannot be easily modified.

This invention was made in view of the above-mentioned circumstances, and can easily and reliably measure the average temperature of a fluid to be measured with a simple configuration, and is especially suitable when applied to a pressurized water reactor plant. 1 without installing a steam generator bypass system
It is possible to measure the temperature of the secondary coolant, thus simplifying the equipment, and reducing the number of systems through which the primary coolant flows, reducing the radiation exposure of workers during maintenance management. Furthermore, the present invention provides a fluid temperature measuring device that can easily measure the average value even when the temperature distribution of the primary coolant in the main coolant piping is not uniform, and can also be applied to conventional plants. The purpose is to provide

(B) Structure of the Invention [Means for Solving the Problem] In response to this objective, the mixed-type fluid temperature measuring device of the present invention has a cylindrical body and a fluid-tight tube body constituting a fluid flow path. a cover attached to the cover and protruding into the flow path; an orifice attached to the inside of the cover and dividing the internal space of the cover into a blemish chamber on the protruding tip side and a measurement fA intersection on the proximal side; , a fluid inlet that penetrates a wall of the cover and communicates the flow path with the plenum chamber; a fluid outlet that penetrates a wall of the cover and connects the flow path with the measuring room; It is characterized by comprising a temperature measuring member for measuring the temperature of the fluid within the temperature measuring chamber.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the details of the present invention will be described with reference to a drawing showing an embodiment in which the present invention is applied to a temperature measuring device for measuring the temperature of a primary main coolant of a pressurized water reactor.

In FIG. 1, 1 is a fluid temperature measuring device.

The fluid temperature measuring device 1 has a cover 2 attached thereto. cover 2
is inserted into and attached to the attachment hole 3 formed through the wall of the primary system main coolant pipe 105. The inside of the primary main coolant pipe 105 constitutes a flow path 5 through which the cold member 4 passes.

The cover 2 has a cylindrical shape with a closed tip 6, and has a mounting hole 3.
It protrudes into the flow path 5 through the welding portion 7 and is welded to the primary main coolant pipe 105 in a fluid-tight manner. An orifice plate 8 is attached inside the cover 2, and this orifice plate 8 divides the interior space of the cover 2 into a plenum chamber 12 on the distal end side 11 and a measuring chamber 14 on the proximal end side 13. The plenum chamber 12 and the measuring chamber 14 communicate through an orifice hole 15 of the orifice plate 8.

A plurality of fluid inlets 16 are formed through the wall of the distal end side 11 of the cover 2, and these fluid inlets 16 communicate the flow path 5 and the plenum chamber 12. The fluid inlet 16 is connected to the cover 2
They are formed on the side of the wall facing the upstream side of the flow path 5 at intervals in the radial direction of the flow path 5.

A fluid outlet 17 is formed in the wall of the base end 13 of the cover 2, and this fluid outlet 17 communicates the flow path 5 with the measuring chamber 14. The fluid outlet 17 is formed on the side of the wall of the cover 2 facing the downstream side of the flow path 5.

A temperature sensing portion 21 of a temperature measuring device e118 is inserted into the temperature measuring chamber 14, and a gap between the cover 2 and the temperature measuring device 18 is filled with a plug 22.

[Operation] In the fluid temperature measuring device configured as described above, a portion of the coolant 4 flowing in the flow path 5 flows into the plenum chamber 12 from the fluid inlet 16 of the cover 2. Fluid inlet 16
The coolant flowing through the plenum chamber 12, which has a different temperature depending on the location of the fluid inlet 16, enters the plenum chamber 12.
The mixture is mixed by the vortex generated in the 2.

The coolant mixed in the plenum chamber 12 flows through the orifice hole 1.
5 into the measuring room 14. This orifice hole 1
5, the coolant is concentrated in one place, further promoting mixing. The temperature of the coolant flowing into the temperature measuring chamber 14 is measured by the temperature sensing part 21 of the temperature measuring device 2!18, and then flows out from the fluid outlet 17 and returns to the flow path 5.

In this embodiment, the fluid inlet 16 is directly connected to the cover 2.
Although the intake nozzle 23 is formed on the wall, the intake nozzle 23 may be attached by penetrating the wall of the cover 2 as shown in FIG. In this case, the nozzle hole 24 of the intake nozzle 23 is connected to the fluid inlet 16.
functions as At this time, if each of the plurality of nozzle holes 24 (fluid inlet 16) is formed in a direction that intersects the flow direction of the coolant flowing therethrough, the flow of the cooling member in the plenum chamber 12 can be improved. mixing is further promoted.

This also applies to the case where the fluid inlet 16 is formed directly on the wall of the cover 2 without using the intake nozzle 23, as shown in FIG.

(c) Effects of the invention As described above, according to the present invention, the average temperature of the fluid to be measured can be easily and reliably measured with a simple configuration, and especially when applied to a pressurized wooden nuclear reactor plant. The temperature of the primary coolant can be measured without providing a steam generator bypass system, and therefore the equipment can be simplified, and
Since the number of systems through which the primary coolant flows is reduced, it is possible to reduce the burden on workers during maintenance management.Furthermore, even if the temperature distribution of the primary coolant in the main coolant piping is not uniform, it can be easily fixed. Thus, it is possible to obtain a fluid temperature measuring device that can measure the average value of the temperature and can also be retrofitted to conventional plants.

[Brief explanation of drawings]

FIG. 1 is an enlarged vertical cross-sectional explanatory diagram showing a mixed-type fluid temperature measuring device according to one embodiment of the present invention, and FIG. 2 is an enlarged vertical cross-sectional view showing a mixed-type fluid temperature measuring device according to another embodiment of the present invention. An explanatory drawing, FIG. 3 is an enlarged vertical cross-sectional explanatory view showing a mixed fluid temperature measuring device according to another embodiment of the present invention, and FIG. 4 is a system diagram showing the primary system of a pressurized wooden nuclear reactor. FIG. 5 is an explanatory cross-sectional view showing a conventional fluid temperature measuring device, and FIG. 6 is an enlarged longitudinal cross-sectional view showing the conventional fluid temperature measuring device. 1... Fluid temperature measuring device! 2...Cover 3...
Mounting hole 4...Coolant 5...Flow path 6...
・Tip 7...Welding part 8...Orifice plate 1
1... Tip side 12... Plenum chamber 13...
- Base end side 14...ll Greenhouse 15... Orifice hole 16... Fluid inlet 17... Fluid outlet 18... Temperature measuring device 21... Temperature sensing part 22
... Plug body 23 ... Intake nozzle 24 ... Nozzle hole Fig. 1 121

Claims (3)

[Claims] (1) A cover that is fluid-tightly attached to a cylindrical body constituting a fluid flow path and protrudes into the flow path, and a tip that is attached to the inside of the cover and protrudes into the internal space of the cover. an orifice dividing a side plenum chamber and a proximal side measuring chamber; a fluid inlet penetrating the wall of the cover to communicate the flow path with the plenum chamber; and a fluid inlet penetrating the wall of the cover. A mixed fluid temperature measuring device comprising: a fluid outlet that communicates the flow path with the temperature measurement chamber; and a temperature measurement member that measures the temperature of the fluid in the temperature measurement chamber. (2) The mixed fluid temperature measuring device according to claim 1, wherein the fluid inlet is constituted by a nozzle hole of an intake nozzle attached to the wall of the cover. (3) A plurality of fluid inlets are formed, and at least some of the fluid inlets are formed in a direction different from that of the other fluid inlets. Mixed fluid temperature measuring device according to item 1 or 2