JPH0631826B2 - Radioactive waste incineration facility - Google Patents

Description

TECHNICAL FIELD The present invention relates to a radioactive waste incineration facility provided with an incinerator main body in a building.

[Conventional technology]

A conventional radioactive waste incineration facility will be described with reference to FIG.

In the figure, 1 is a building. Reference numeral 2 denotes an incinerator body provided in the building 1, and the incinerator body 2 is composed of an incinerator, a heat exchanger, a filter, an electric dust collector, an exhaust gas scrubber, and the like. Reference numeral 3 denotes an incineration air inlet to the incineration equipment main body 2 connected to the incineration equipment main body 2, and in this example, combustion air is separated from the air in the building 1. Reference numeral 4 is a blower for supplying combustion air to the main body 2 of incineration equipment provided between the main body 2 of incineration equipment and the intake 3 for combustion air. The combustion air supply blower 4 may not be installed depending on the method of the incinerator main body 2. 5 is connected to the incinerator body 2 to keep the air pressure in the incinerator body 2 at a pressure slightly lower than the atmospheric pressure in the building 1 to prevent dust containing radioactivity from leaking from the incinerator body 2 into the building 1. The incineration equipment body exhaust system 5 to prevent,
It is composed of an exhaust fan 5A and its standby device 5B, an emergency power supply (not shown) for a backup function, and an automatic switching device 5C having an unattended automatic switching function. Reference numeral 6 denotes a HEPA filter interposed between the incinerator main body 2 and the exhaust unit 5A and the standby unit 5B of the exhaust system 5 exhaust system 5.
The filter 6 removes radioactive substances contained in the exhaust gas of the incinerator body 2 released from the incinerator body 2 to the atmosphere outside the building 1 to a level not more than the allowable value by law. Reference numeral 7 denotes a building air supply system. This building air supply system 7 includes an air intake 7A provided in the building 1 and a building air supply blower connected to the air intake 7A.
7B and an air outlet 7C for building air supply connected to the building air supply blower 7B. 8 indicates that the atmospheric pressure inside the building 1 is kept slightly negative than the atmospheric pressure outside the building 1 so that the air inside the building 1 which may be contaminated by radioactive substances leaks into the atmosphere outside the building 1. The building exhaust system 8 is a building exhaust system that prevents the exhaust fan 8A and its spare unit 8B, an emergency power supply (not shown) for a backup function, and an automatic switching function for these unmanned vehicles. It has an automatic switching function 8C and an air intake 8D for building replacement exhaust gas connected to the exhaust fan 8A and its standby machine 8B. Reference numeral 9 is a HEPA filter provided between the air intake 8D of the building exhaust system 8 and the exhaust fan 8A and its spare 8B.
Eliminate radioactive substances contained in building exhaust emitted to the outside atmosphere to below the allowable value by law. 10 is a stack connected to the exhaust system 5 of the incinerator body and the exhaust system 8 of the building.

In such a radioactive waste incineration facility, in order to prevent leakage of dust containing radioactivity from the incineration facility body 2 into the building 1, even when the incinerator body 2 is stopped,
Exhaust device 5A of incineration equipment main exhaust system 5 or its spare device 5B
Must be driven to keep the atmospheric pressure inside the incinerator main body 2 slightly negative than the atmospheric pressure inside the building 1. Also, in order to prevent the air inside the building 1 that may be contaminated by radioactive substances from leaking into the atmosphere outside the building 1, constantly drive the exhaust fan 8A of the building exhaust system 8 or its standby machine 8B. Therefore, it is necessary to keep the atmospheric pressure inside the building 1 slightly negative than the atmospheric pressure outside the building 1.

[Problems to be solved by the invention]

However, since the above-mentioned radioactive waste incineration facility is simply the exhaust system 5 and the building exhaust system 8 of the incinerator body connected to the stack 10, the incinerator system is always in operation even when the incinerator body 2 is stopped. By driving the air exhauster 5A of the main body exhaust system 5 or its standby unit 5B, the atmospheric pressure inside the incinerator main body 2 is kept slightly negative than the atmospheric pressure inside the building 1, and the incinerator main body 2 for dust containing radioactivity It is necessary to prevent leakage into the building 1. Therefore, running costs such as power cost of the incinerator body exhaust system 5 are increased, and maintenance and maintenance work amount is increased, and there is a problem that unnecessary life of the incinerator body exhaust system 5 is shortened. .

An object of the present invention is to provide a radioactive waste incineration facility capable of reducing the running cost and maintenance work amount of the exhaust system of the incinerator body, and further extending the life of the exhaust system of the incinerator body. is there.

[Means for solving problems]

The present invention is characterized in that a negative pressure generating device for generating a negative pressure according to Bernoulli's principle is provided in the building along with the flow of the building exhaust system, and the incinerator main body exhaust system is connected to the negative pressure generating device.

[Work]

Since the present invention is configured as described above, even if the operation of the exhaust system of the incinerator body is stopped when the operation of the incinerator body is stopped, by operating the building exhaust system, the Bernoulli's By the principle, negative pressure is generated in the negative pressure generator. Then, a flow is generated in the exhaust system of the incinerator body, so that the atmospheric pressure inside the incinerator body can be maintained at a negative pressure than the atmospheric pressure inside the building, similarly to when the incinerator body exhaust system is operated.

〔Example〕

The first embodiment of the radioactive waste incineration facility of the present invention will be described below.
A description will be given with reference to FIGS.

In the figure, the same symbols as in FIG. 4 indicate the same components. 11 is building 1
A negative pressure generator provided inside the negative pressure generator 11
The partition plate 11B is provided in the hollow main body 11A in the exhaust direction (axial direction of the hollow main body 11A) to form two exhaust passages 11C and 11D. The building exhaust system 8 and the incinerator main body exhaust system 5 are connected to the inlets 11E and 11F of the two exhaust paths 11C and 11D, respectively. At the center of the partition plate 11B, an inlet 11G is provided, and at the upstream edge of the inlet 11G, an attracting amount adjusting vane 11H is attached to the partition plate 11B so as to be movable in the exhaust direction. This attracting amount adjusting vane 11H is made by bending both ends of a rectangular thin steel plate in the same direction and providing a long hole 11I at one end in the longitudinal direction of the attracting amount adjusting vane 11H. Screw 11J to partition plate 11B via 11I
Is attached so as to be movable in the drilling direction of the long hole 11I, that is, in the exhaust direction. Exhaust path 11C on the building exhaust system side
Is provided in association with the 11G attraction port. Partition damper on the downstream side of the inlet 11G of the exhaust passage 11D on the exhaust system side
Install 11L so that it can be opened and closed. Two exhaust channels 11C and 11
Connect outlets 11M and 11N of D to stack 10.

The radioactive waste incineration facility of the present invention in this embodiment is
Due to the above-mentioned configuration, when the incinerator body 2 is in operation, the exhaust system 5A of the incinerator body exhaust system 5 or its spare unit 5B and the exhaust unit 8A of the building exhaust system 8 or its spare unit
Operate with 8B and open the partition damper 11L of the negative pressure generator 11. Then, the air pressure inside the incinerator body 2 becomes slightly negative than the air pressure inside the building 1, and it is possible to prevent dust containing radioactivity from leaking into the building 1 from the incinerator body 2.
The atmospheric pressure inside the building 1 becomes a little negative pressure than the atmospheric pressure outside the building 1, and it is possible to prevent the air inside the building 1 that may be contaminated by radioactive substances from leaking into the atmosphere outside the building 1. .

Next, when the incinerator main body is out of operation, the exhaust system 8A of the building exhaust system 8 or its spare unit 8B is always operated, while the exhaust unit 5A of the incinerator main system exhaust system 5 or its standby unit 5B is stopped. Then, close the partition damper 11L of the negative pressure generator 11. Then, the replacement exhaust gas is flowing into the exhaust passage 11C on the side of the building exhaust system, and the flow velocity becomes faster and the pressure decreases and negative pressure is generated in the throttle portion 11K by Bernoulli's principle. As a result, the air in the exhaust passage 11D on the exhaust system side of the incinerator body is attracted from the inlet 11G into the exhaust passage 11C on the exhaust system side of the building, and is incinerated via this exhaust passage 11D and the exhaust system 5 of the incinerator body. The atmospheric pressure inside the equipment main body 2 is kept slightly negative than the atmospheric pressure inside the building 1. Therefore, it is possible to prevent dust containing radioactivity from leaking into the building 1 from the incinerator main body 2, while maintaining the atmospheric pressure inside the building 1 at a slightly negative pressure than the atmospheric pressure outside the building 1 to prevent radioactive substances from being emitted. It is possible to prevent the air inside the building 1, which may be contaminated, from leaking to the atmospheric pressure outside the building 1.

It should be noted that the partition damper 11L is for closing the incinerator main body 2 when the operation of the incinerator main body 2 is stopped so that negative pressure is easily generated.
In addition, the attracting amount adjusting vane 11H is moved in the exhaust direction so that it can respond to fluctuations in pressure, air volume, etc., and the air in the exhaust path 11D on the exhaust system side of the incinerator body is exhausted to the exhaust path on the building exhaust system side. It regulates the amount of attraction to 11C.

The following table (1) shows the annual electric power consumption by the conventional radioactive waste incineration equipment, and the following table (2) shows the annual electric power consumption by the radioactive waste incineration equipment of the present invention. As is clear from Tables (1) and (2), the annual power consumption of the facility of the present invention is 66% lower than the annual power consumption of the conventional facility.

[Effects of the Invention] As is clear from the above, the radioactive waste incineration facility of the present invention is provided with a negative pressure generating device for generating a negative pressure by Bernoulli's principle with the flow of the building exhaust system in the building, Since the negative pressure generator is connected to the exhaust system of the incinerator body, even if the operation of the incinerator body exhaust system is stopped when the incinerator body operation is stopped, the building exhaust system can be operated by operating the building exhaust system. With the flow of the system, negative pressure is generated in the negative pressure generator by Bernoulli's principle. Then, a flow is generated in the exhaust system of the incinerator body, so that the atmospheric pressure inside the incinerator body can be maintained at a negative pressure than the atmospheric pressure inside the building, similarly to when the incinerator body exhaust system is operated. Therefore,
When the operation of the incinerator body is stopped, the operation can be stopped by the exhaust system of the incinerator body, which reduces the running cost and maintenance work of the exhaust system of the incinerator body compared to the conventional radioactive waste incinerator. It is possible to extend the life of the exhaust system of the incinerator body.

[Brief description of drawings]

1 to 3 show an embodiment of the radioactive waste incineration facility of the present invention, FIG. 1 is a schematic explanatory view, FIG. 2 is a partially cutaway side view of a negative pressure generator, and FIG. It is a perspective view of an attracting amount adjustment vane. FIG. 4 is a schematic explanatory view showing a conventional radioactive waste incineration facility. 1 ... Building, 2 ... Incinerator body, 5 ... Incinerator body exhaust system, 8 ... Building exhaust system, 11 ... Negative pressure generator, 11A
…… Main body, 11B …… Partition plate, 11C, 11D …… Exhaust path, 11E,
11F …… Inlet, 11G …… Induction port, 11H …… Induction amount adjusting vane, 11I …… Slot, 11J …… Screw, 11K …… Throttle part,
11L …… Partition damper.

Claims (2)

[Claims] 1. A building, an incinerator main body provided in the building, an exhaust system for an incinerator main body connected to the incinerator main body to keep the atmospheric pressure in the incinerator main body at a negative pressure than the atmospheric pressure in the building,
In a radioactive waste incinerator equipped with a building exhaust system that ventilates the inside of the building and keeps the atmospheric pressure negative than the atmospheric pressure outside the building, in the building, negative pressure is applied according to the Bernoulli's principle with the flow of the building exhaust system. Is equipped with a negative pressure generator that generates
A radioactive waste incineration facility characterized in that the negative pressure generator is connected to the exhaust system of the incinerator body. 2. A negative pressure generating device, wherein a partition plate is provided in the main body in the exhaust direction to form two exhaust passages, and an incinerator main body exhaust system and a building exhaust system are provided at the inlets of the two exhaust passages. Each of them is connected to the partition plate, and an intake port is provided on the partition plate.At the same time, an attraction amount adjusting vane is attached to the partition plate at the edge of the intake port so that it can be moved in the exhaust direction. The radioactive waste incineration installation according to claim 1, wherein a partition damper is provided so as to be openable and closable on the downstream side of the inlet of the exhaust passage on the exhaust system side of the incinerator main body, provided correspondingly.