JPH11160493A - Wet calorific value measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wet calorific value measuring device capable of lessening measuring items, simplifying structure and highly precisely measuring. SOLUTION: A whole vitrificated body put in a canister 2 is submerged in a measuring tank 11 supplying water 12, and its weight is measured by a gravimeter 13 together with the measuring tank 11. The amount of steam is found from the change of the weight for a constant time by computer 14, and a calorific value is found by calculation. Measuring items are only weight, and also the calorific value can be highly precisely found by receiving the whole heat of the canister 2. As a result, a measuring system can be simplified, and highly precise measurement can be performed without need of correction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet calorific value measuring apparatus, which is capable of measuring the calorific value of a vitrified body containing radioactive waste from a nuclear facility easily and accurately.

[0002]

2. Description of the Related Art One of the cases where it is necessary to measure the calorific value is a vitrified material in which a high-level waste liquid generated by the reprocessing of spent fuel in a nuclear power plant is placed in a sealed container (canister). In order to store safely in a radioactive waste storage facility for a long period of time, it is necessary to measure in advance the heat generated by the vitrified material itself.

In order to measure the calorific value of the vitrified body, for example, as shown in FIG. 2, a vitrified body placed in a canister 2 is placed on a turntable 1 and a heat flux meter 3 is driven by a driving device 4.
To bring the canister 2 closer to the side,
The heat flux is measured while moving up and down along the side surface, and the total calorific value is obtained by calculation from the previously obtained surface area of the canister 2 and the like.

[0004]

However, when using such a heat flux meter 3 and calculating the total calorific value from the result, the measured value of the heat flux meter 3 is used for the canister 2 which is the surface to be measured. There is a problem that the side surface is easily affected by the emissivity, and it is necessary to correct the effect of the emissivity.

In addition, the heat flux meter 3 cannot measure the energy dissipated in the form of gamma rays, and there is also a problem that correction for this must be performed.

A calorimeter method can be considered as a method capable of performing measurement without being affected by radiation correction or gamma rays. For example, as shown in FIG. 3, a canister in which a vitrified body is accommodated in an insulated closed container 5 is provided. 2, the air is sucked by the fan 6, the flow rate of the air is measured by the flow meter 7, and the calorific value is obtained by measuring the inlet temperature and the outlet temperature of the air by the temperature detectors 8, 9. There is
There is a problem that the number of items to be measured is large, the fan 6 and the like are required, and the device becomes large.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the prior art, and has as its object to provide a wet calorific value measuring apparatus which has a small number of measurement items, has a simple structure, and can measure with high accuracy. is there.

[0008]

According to a first aspect of the present invention, there is provided a wet calorific value measuring apparatus, comprising: a measuring tank in which an object to be measured is placed in a submerged state; And a calculating means for calculating the calorific value from the measured value and time from the weighing scale.

According to this wet calorific value measuring device, the object to be measured is placed so as to sink entirely into a measuring tank containing a liquid, and the weight of the measuring tank together with the measuring tank is measured.
The liquid is heated and evaporated by the heat of the object to be measured, the amount of evaporation is measured by a change in weight over a certain period of time, and the calorific value is calculated from these values. The amount of generated heat can be obtained with high accuracy by receiving all of the heat.

As a result, the measurement system can be simplified, and high-precision measurement can be performed without the need for correction.

According to a second aspect of the present invention, there is provided a wet calorific value measuring apparatus according to the first aspect, wherein the object to be measured is a vitrified body, and water is poured into the measuring tank for measurement. It is characterized by doing.

According to this wet calorific value measuring apparatus, the object to be measured is a vitrified body, and water is put into the measuring tank for measurement. Thus, the calorific value of the vitrified body can be determined easily and accurately. Will be able to

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram according to an embodiment of the wet calorific value measuring apparatus of the present invention.

The wet calorific value measuring apparatus 10 includes a measuring tank 11 having an open upper portion, and has a size capable of sinking the vitrified material contained in the canister 2 as a measured object.

A liquid that can be evaporated by the heat of the vitrified material is placed in the measuring tank 11. For example, water 12 is used here.

A weighing scale 13 is arranged below the measuring tank 11 so that the weight of the measuring tank 11 can be measured. The result of the measurement of the weight w is input to a computer 14 which is an arithmetic means. It is like that.

A time t is input to the computer 14 in order to know the time measured by the weighing scale 13.

Further, the computer 14 is connected to a display 15 for displaying a calorific value Q as a calculation result.

Next, the operation of the wet calorific value measuring device 10 thus configured and the measurement of the calorific value of the vitrified material placed in the canister 2 will be described.

First, the measuring tank 11 placed on the weighing scale 13
Water 12 is put in the inside, and the vitrified matter put in the canister 2 is put into the water 12 of the measuring tank 11 to be submerged.

Then, the water is heated by the heat generated from the vitrified body, and when the temperature reaches 100 ° C., the water 12 evaporates.

Then, in order to know the evaporation amount Δw within the unit time Δt, the weight w1 at the time t1 and the weight w2 at the time t2 after the lapse of a certain time are measured and input into the computer 14.

Then, the evaporation amount per unit time is obtained, and based on this, the total heat generation amount of the vitrified material is calculated, and the result is displayed on the display unit 15.

According to such a wet calorific value measuring device 10, the amount of evaporation of the water 12 in the measuring tank 11 is simply measured by the weighing scale 13, and the vitrified material put in the canister 2 is calculated by the computer 14. Calorific value can be obtained, the measurement system can be simplified, and the energy dissipated in the form of gamma rays can be measured without being affected by radiation. And the calorific value can be measured with high accuracy.

In the wet calorific value measuring apparatus 10,
There are no moving parts such as a driving device for driving a fan or a sensor, and maintenance is easy.

In the above-described embodiment, the measurement is carried out by putting water in the measuring tank. However, the measurement is not limited to water, and the measurement may be carried out by putting other liquids. It is not limited to the vitrified body put in the container, but may be another type that needs to measure the calorific value.

[0027]

As described above in detail together with one embodiment, according to the wet calorific value measuring apparatus according to the first aspect of the present invention, the object to be measured is entirely settled in the measuring tank filled with liquid. As a matter of fact, the weight of the measuring tank was measured with a weighing scale, so the liquid was heated and evaporated with the heat of the object to be measured, and the amount of evaporation was measured by the change in weight over a certain period of time.
From these, the calorific value can be obtained by calculation, and the measurement item only needs to be weight. Further, the calorific value can be obtained with high accuracy by receiving all the heat of the measured object.

As a result, the measuring system can be simplified to the measurement of weight only, and the measurement can be performed with high accuracy without the need to correct the influence of radiation or the like.

According to the wet calorific value measuring apparatus of the second aspect of the present invention, the object to be measured is a vitrified body, and water is put into the measuring tank for measurement. The calorific value of the vitrified body can be determined.

Thus, the calorific value of the vitrified body can be measured with high accuracy only by measuring the weight without being affected by radiant heat or heat generated from the upper surface of the vitrified body.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram according to an embodiment of a wet calorific value measuring apparatus of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional measuring device for obtaining a calorific value of a vitrified body from a heat flux.

FIG. 3 is a schematic configuration diagram of a conventional measuring device for obtaining a calorific value of a vitrified body from a temperature change of air.

[Explanation of symbols]

 2 Canister (vitrified body) 10 Wet calorific value measuring device 11 Measurement tank 12 Water 13 Weight scale 14 Computer (calculation means) 15 Display

Claims (2)

[Claims] 1. A measuring tank in which an object to be measured is placed in a submerged state, a weight meter for measuring the weight of the measuring tank to determine the weight of a liquid to evaporate, and generating heat from measured values and time from the weight meter. A wet-type calorific value measuring device, comprising a calculating means for calculating an amount. 2. The wet calorific value measuring apparatus according to claim 1, wherein the measurement object is a vitrified body, and water is put into the measurement tank for measurement.