JPS6317199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radioactive waste combustion control method and a combustion control device that optimally control the combustion state in an incinerator.

Radioactive combustible waste generated from nuclear power plants, etc. is generally incinerated to prevent spoilage, fermentation, or fire that may occur during storage, and to significantly reduce volume. . In this case, solid radioactive waste is usually packed into polyethylene bags or paper cartons before being put into the incinerator to facilitate handling during incineration and to prevent radioactive materials from scattering. It is generally treated by incineration.

However, in the conventional incineration method, various types of waste are packed as they are in polyethylene bags, etc., and are thrown into an incinerator at regular intervals for incineration. The combustion state in the incinerator differs depending on the input amount, and there is also a large difference in calorific value, leading to the problem that the combustion state is unstable and optimal combustion cannot be continued.

In order to eliminate these problems, an incineration method has been used in which radioactive waste is sorted by type, packed into bags, and then grouped by type and incinerated at different times. If there is variation in weight, the combustion state is unstable. For example, if heavy bagged objects are continuously fed in, the temperature inside the furnace will rise too much and it will be necessary to temporarily wait for feeding. or the amount of unburned dust generated increases due to insufficient combustion air.

Furthermore, when small-weight bags are continuously fed into the furnace, the temperature inside the furnace drops too much and the combustion condition deteriorates. For this reason, waste that has been sorted by type is weighed to a certain weight, packed into bags, and then incinerated. In addition, workers handling waste may be exposed to radiation from the radioactive materials contained in the waste, or may inhale toxic radioactive materials into their bodies. There were problems and shortcomings.

The present invention provides a combustion control method and combustion control device for radioactive waste that solves the above-mentioned conventional problems and drawbacks and constantly controls the combustion state in an incinerator optimally even when the type and amount of waste changes. It is something to do.

That is, the present invention detects the type of radioactive waste that has been separated into bags of appropriate size and the weight of the bag, and detects the type and weight of the detected radioactive waste. A combustion control method for radioactive waste, which automatically adjusts the interval at which bagged objects are introduced into an incinerator based on a preset reference interval, and controls the combustion state in the incinerator to an optimal state; and a supply mechanism that supplies bagged bodies of radioactive waste sorted by type, a detector that detects the weight of the bagged bodies and the type of radioactive waste supplied by the supply mechanism, and the detector. a comparator for calculating the interval at which the bagged bodies are introduced into the incinerator in accordance with a standard input interval that is set and stored in advance according to the weight and type of radioactive waste detected by the system; This is a combustion control device for radioactive waste, which is comprised of at least a charging machine that throws the detected bagged objects into an incinerator based on a signal from a comparator.

Hereinafter, a more detailed configuration of the present invention will be explained based on FIG. 1 and FIG. 2 showing one specific example.

Bagged bodies 1 of radioactive waste separated by type such as polyethylene, paper, cloth, etc. are sent at predetermined intervals by a supply mechanism 2 such as a conveyor, and the radioactive waste in the bagged bodies 1 are The type of bag is detected by a type detector 3, and the weight of the bagged body 1 is detected by a weight detector 4. Then, each detected signal is introduced into a comparator 5. As will be described later, the comparator 5 calculates the interval at which the bagged bodies 1 are introduced into the incinerator 13 in accordance with the reference interval which is set and stored in advance. At the same time, the bagged objects 1 whose type and weight have been detected are stored in a temporary storage tank 7 in a charging machine 6 that feeds the bagged objects 1 into an incinerator 13.

Then, according to the charging interval into the incinerator 13 calculated by the comparator 5, the lower partition damper 8 of the temporary storage tank 7 is opened by the action of the cylinder 9.
At the same time, the bagged body 1 falls into the charging bucket 10 below, is moved together with the charging bucket 10 by the operation of another cylinder 11, is thrown into the incinerator 13 through the incinerator's charging port 12, and is incinerated. be done.

In addition, as a method for detecting the type of the filling material in the bagged object 1, for example, waste is packed into bags of different colors depending on the type and placed on the supply mechanism 2 at random, and the type detector 3 detects the filling material in the bagged object 1. The filling can be detected by detecting the color of the bag, or by marking the bag with different magnetic marks depending on the type of waste, and by detecting the magnetism of the bag with the type detector 3. A rotary knob (not shown) is provided for each section of the supply mechanism 2, and the rotary knob is set in a predetermined direction depending on the type of the bagged object 1, and rotated by the type detector 3. There are methods such as detecting the filling by detecting the direction of the type knob, or similar methods.

On the other hand, as the weight detector 4, various types of scales such as a spring scale and a load cell can be used.

Incidentally, the type detector 3 and the weight detector 4 may be separate or integrated.

Furthermore, a comparison calculator receives signals from the type detector 3 and the weight detector 4 and compares and calculates the interval at which the bagged objects 1 are introduced into the incinerator 13 with a preset and stored reference interval. 5, a timer or a simple microcomputer can be used.

The feeding interval to the incinerator 13 according to the type and weight of the bagged objects 1 is calculated as follows: [Insertion interval] ≒ k x [bagged weight] (k depends on the capacity of the incineration equipment and the type of bagged objects) For example, the third
As shown in Fig. 4 for the case of incinerating polyethylene and Fig. 4 for the case of incinerating dehydrated paper or cloth, the bag filling weight and the feeding interval have the relationship as shown.

Therefore, the comparator 5 has the function shown in FIG.
If the relationship shown in the figure is memorized and the type and weight of the bagged objects are detected, the feeding interval to the incinerator can be immediately calculated.

If a timer is used as the comparator as described above, it is preferable to provide a plurality of timers with variable set values using servo motors or the like for each bagged object. First, a timer is selected upon receiving a detection signal of the type of the bagged object 1, and then a timer is selected after receiving a detection signal of the weight of the bagged object 1, and the set value of the timer is set according to the proportional relational expression described above. Simply, it is preferable to store the above proportional relational expression in a small microcomputer, input the type and weight of the bagged object 1, and calculate the feeding interval.

As described above, the combustion control method and device of the present invention eliminates the need for weight management when bagging waste, simplifying the waste pre-treatment process.
In addition to saving labor, the amount of heat generated per waste incineration time can be kept almost constant, so the incineration process can be controlled to the optimal combustion state.
Furthermore, it has many advantages such as enabling efficient operation of incineration equipment, and is an extremely useful method and apparatus industrially.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing a specific example of the combustion control device according to the present invention, and FIGS. 3 and 4 show the relationship between the weight of different types of bagged bodies and the interval at which they are introduced into the incinerator. FIG. 1... Bagged object, 2... Supply mechanism, 3... Type detector,
4... Weight detector, 5... Comparison calculator, 6... Loading machine,
13...Incinerator.

Claims (1)

[Claims] 1. Detecting the type and weight of radioactive waste that has been separated into bags of appropriate size and the weight of the bag, and detecting the type and weight of the detected radioactive waste. A radioactive material characterized by automatically adjusting the interval at which bagged bodies are introduced into the incinerator based on a preset reference interval to control the combustion state in the incinerator to the optimum state. Waste combustion control method. 2. A supply mechanism for supplying bagged bodies of radioactive waste separated by type, a detector for detecting the weight of the bagged bodies and the type of radioactive waste supplied by the supply mechanism, and the detector. a comparator for calculating the interval at which the bagged bodies are introduced into the incinerator in accordance with a standard input interval that is set and stored in advance according to the weight and type of radioactive waste detected by the system; A combustion control device for radioactive waste, characterized in that it comprises at least a feeding machine that feeds the detected bagged objects into an incinerator based on a signal from a comparator.