JPS6165137A - Testing device of high temperature corrosion - Google Patents

Abstract

PURPOSE:To make the structure of a device small in size by storing a pipe-like sample and a heating source in a water tank, forming a gas phase forming member covering a sample corrosion testing surface, forming an airtight space between the surfaces of samples other than a lower end part, and arranging an external heater. CONSTITUTION:An internal heater 7 is inserted into the inside of the pipe-like sample 1, a gap between the inside and the heater 7 is filled with an inert gas such as pressure-reduced helium gas and the gas is sealed by a heat insulation cylinder 9 and an o-ring 10. The cylindrical gas-phase forming member 8 is concentrically arranged on the outer peripheral part of the sample 1 and an o-ring 11 and a spacer 12 are arranged on the upper and lower end parts of the sample 1 to form a sealed space part. Water in the water tank 16 is heated up to 100 deg.C by the external heater 17 and the water included in the gap between the member 8 and the sample1 is heated and evaporated by the calorific value of the internal heater 7. Consequently, the structure is reduced and simplified and the working efficiency and safeness can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a high-temperature corrosion test apparatus that performs testing by heating a sample in a water tank.

[Background of the room]

A conventional high-temperature corrosion test device is explained in Fig. 1. 1st
The figure shows a longitudinal cross-sectional view, and 1 is a sample, which is housed in a cage 2 and sealed in a pressure vessel 3.

4 is a heater, 5 is a temperature sensor, and 6 is a heat insulating material. Normally, in corrosion tests for piping materials for five-circle furnaces, the central test portion requires temperature conditions of up to about 1000'C. In this high-temperature corrosion test, water injected into the pressure vessel 3 is heated by the heater 4, and the pressure vessel 3 is filled with heated steam of several atmospheres, thereby exposing the sample 1 to high-temperature steam. In this case, temperature control is performed using a temperature sensor 5.

In the food test equipment, this high temperature j tends to require heating the entire pressure vessel 3 to 1000t:' or higher, which is the test weaving temperature.Furthermore, since the amount of heat dissipated from the pressure vessel 3 is large, a large amount of heat insulating material 6 is required. In addition to this, the structure of the corrosion test equipment becomes larger. In addition, since the pressure vessel 3 itself is exposed to a high-temperature steam environment, it is difficult to select materials, and it is not easy to manufacture the device.Furthermore, because a large amount of superheated steam is used, the work is dangerous. There was a problem.

[Purpose of the invention]

The present invention was made in view of the above situation, and an object of the present invention is to provide a high-temperature corrosion test device whose structure can be downsized and simplified, which is easy to manufacture, and which can improve test workability and safety. It's what I did.

[Summary of the Invention] The high-temperature corrosion test device of the present invention comprises: a sample of a tubular material or a flat material; a heating source disposed on the other surface of the sample on which one surface is subjected to a corrosion test; a water tank in which a heating source is accommodated; an external heater placed at the bottom of the water tank to heat the water temperature of the water tank to 100 r; and the corrosion test surface of the sample arranged vertically in the water tank. A gas phase forming member is provided such that the gas phase forming member and the lower end of the sample communicate with the inside of the water tank, and a portion of the sample surface other than the lower end is provided above the lower end. the vapor phase forming member disposed to form a sealed space; and the internal heater of the heating source configured to be able to heat the sample to a predetermined temperature so as to form a vapor layer in the sealed space. It has been established.

As mentioned above, conventional high-temperature corrosion test equipment uses methods such as keeping the entire container containing the sample at the test temperature, or other methods such as spraying high-temperature steam onto the sample surface, but in both cases, tests exceeding 1000C are not possible. The equipment has become large-scale, and work efficiency has been impaired. On the other hand, in the apparatus of the present invention, an internal heater is placed on one side of a water tank in a liquid phase under atmospheric pressure, and an internal heater is placed on the other side of the sample to generate a gas phase in the water tank, which is maintained at 10 (l). Arranging the gas phase forming member,
Since a high-temperature steam layer is created locally only in the vicinity of the sample, the main constituent materials can be used in a water tank of about 100 C', and there is no need to use heat-resistant materials except for the heating source.

[Embodiments of the invention]

The high-temperature corrosion testing apparatus of the present invention will be explained below using examples and FIG. 2, in which the same parts as those of the conventional apparatus are denoted by the same reference numerals. Figure 2 is a longitudinal sectional view. In the figure, sample 1 has an outer diameter of 1011I
I11 is a Zircaloy tube with an inner diameter of 8 mm, and a tungsten-shaped internal heater 7 with an outer diameter of 3 mm is inserted inside the sample 1. The gap between the inner periphery of the sample 1 and the heater 7 is filled with a reduced pressure inert gas such as helium gas.
A heat insulating cylinder 9 and an O-ring 10 are attached and sealed at the upper and lower ends of this gap with the O-ring 10 on the end side. Further, a cylindrical gas phase forming member (SUS) is formed on the outer periphery of the sample 51, and only the lower end side is communicated with, and a space is formed in the upper part (from the lower end) that is sealed except for the lower end side. The upper and lower ends of the internal heater 7 are connected to the upper electrode 13 and the lower polarization 14, and the lower electrode 14 is connected to the water tank 1 containing the gas phase forming member 8, the sample 1, etc.
6 and is connected to an external power source by a lead wire 15. In addition, the water tank 16 is connected to the external heater 1
It is supported to be heated to 7.

In the above structure, the water in the water tank 16 is heated to 100C by the external heater 17, and the water in the water tank 16 is heated to 6W by the internal heater 7.
A current is made to flow so that a calorific value of 10n is obtained. This calorific value warms the water in the gap between the cylindrical vapor phase forming member 8 and the sample 1, and when the outer surface temperature of the vapor phase forming member 8 is 100C, the outer surface temperature of the sample 1 is 1
The temperature will exceed 20C. FIG. 3 shows the temperature distribution when the upper end of this gap is in the OIjing 11, with the horizontal axis representing the radial direction of the sample 1 and the vertical axis representing the temperature. The thermal conductivity of water vapor is lower than that of water, and in the case of a calorific value of 6 W/mouth, the outer surface temperature of the longitudinal center portion of the sample 1 is 1050C. Further, the temperature of the internal heater 7 is about 15,000. The specific resistance of tungsten in the internal heater 7 increases as the temperature rises. The specific resistance value of 1500C is
It is 49μΩ/α, and the calorific value of 6W10n is 159A,
Obtained by lightning, voltage of 0.037V. If the length of the internal heater 7 is 300 fl, even if the power loss in the lead wire 15 is taken into account, the power will not exceed 2 to 3 V. The temperature of the sample 1 can be freely selected depending on the gap length between the gas phase forming member 8 and the sample 1 and the amount of heat generated by the internal heater 7. If transparent glasses are used for the water tank 16 and the gas phase forming member 8, the progress of corrosion of the sample 1 can be visually observed. Furthermore, although the above embodiments have been described with respect to the case in which the sample and the gas phase forming member are formed of cylindrical materials, the same applies if they are formed of flat plate materials.

Since the high-temperature corrosion test apparatus of this example is configured in this way, the high-temperature steam of 1000C or higher is applied only near the outer surface of the sample, and most of the apparatus is in contact with water of about 100C, and the high-temperature steam layer is Since the amount is small, there is no need to use p1 high-temperature steam in which the main constituent materials are kept at a high test temperature as in the past. Therefore, the structure can be made smaller and simpler, making it easier to manufacture and improving the workability and safety of the test. And the potential difference between the upper and lower electrodes is 2-3V
It is extremely safe because the pressure is low and the high temperature steam layer is small. In addition, by forming the water tank wall and the tube of the gas phase forming member from a transparent material, it is possible to visually observe the progression of corrosion of the sample. By using stainless steel as the heat source and placing the high-temperature corrosion test apparatus of the above example in the reactor water, the sample temperature can be lowered to the temperature of the reactor's municipal water by utilizing the r heat generated by the stainless steel. υIt is also possible to maintain it at a high temperature.

〔Effect of the invention〕

As described above, the uninvented high-temperature corrosion testing device has a compact and simple structure, is easy to manufacture, and has sound effects that improve test workability and safety.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a conventional high-temperature corrosion test apparatus, Fig. 2 is a longitudinal cross-sectional view of an embodiment of the high-temperature corrosion test apparatus of the present invention, and Fig. 3 is an explanation of the radial temperature distribution of the sample, etc. in Fig. 2. It is a diagram. DESCRIPTION OF SYMBOLS 1... Sample, 7... Internal heater, 8... Gas phase forming member, 16... Water tank, 17... External heater.

Claims (1)

[Claims] 1. A sample of a tubular or flat material, a heating source placed on the other side of the sample on which one side is subjected to a corrosion test, and the sample and the heating source are accommodated. A water tank is installed at the bottom of the water tank, and the water temperature of the water tank is set to 100°C.
an external heater for heating the sample, and a vapor phase forming member so as to cover the corrosion test surface of the sample arranged vertically in the water tank, and between the vapor phase forming member and the lower end of the sample. is connected to the inside of the water tank and is disposed above the lower end to form a sealed space between the sample surfaces other than the lower end, and a vapor layer is formed in the sealed space. A high-temperature corrosion testing apparatus, comprising: an internal heater of the heating source configured to be able to heat the sample to a predetermined temperature. 2. The sample is formed from a tubular material, the internal heater is inserted into the interior of the sample, and the gas phase forming member is formed from a tubular material and is arranged concentrically with a predetermined space around the outer periphery of the sample. 2. The high-temperature corrosion test apparatus according to claim 1, wherein upper ends of the sample and the gas phase forming member are sealed via a heat insulating material and an O-ring.