JPH03200098A - Concentrated waste liquid washing device - Google Patents

Abstract

PURPOSE:To decrease the amt. of the secondary waste to be generated and to improve the treating efficiency of a waste liquid solidification treating system by providing a solidification treating system inlet valve which can shut off a concd. waste liquid transfer piping on the waste liquid solidification treating system side of the concd. waste liquid transfer piping. CONSTITUTION:After the concd. waste liquid 2 in a concd. waste liquid tank 1 is transferred through the concd. waste liquid transfer piping 3 to the waste liquid solidification treating system, a tank outlet valve 4 is closed and a transfer pump 5 is stopped. A washing water inlet valve 7 is opened, upon completion of the transfer, to inject the washing water from a washing water piping 6 into the piping 3. A solidification treating system inlet valve 8 is closed after the inside of the piping 3 is filled with the washing water. The residual concd. waste liquid in the piping 3 is diluted by resting for the specified time in this state and thereafter, the inlet valve 8 is opened and the residual concd. waste liquid and the washing water are discharged to the waste liquid solidification treating system. As a result, a washing effect is enhances with the smaller volume of the washing water in the washing of the transfer pump 5 and the piping 3. The amt. of the secondary waste to generated is, therefore, decreased, by which the treating efficiency of the concd. waste liquid is improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a concentrated waste liquid equipment for transferring concentrated waste liquid generated from various plants such as nuclear power plants and chemical industrial plants to solidification equipment, etc. The present invention relates to a concentrated waste liquid cleaning device that cleans with cleaning water.

(Prior Art) A conventional concentrated waste liquid cleaning device will be described using a concentrated waste liquid cleaning device in a nuclear power plant as an example.

Nuclear power plants generate various chemical waste liquids. This chemical waste liquid is concentrated and distilled for reuse within the plant, and the remaining concentrated waste liquid is stored for a certain period of time in a concentrated waste liquid tank, and after attenuating the radiation level, it is transferred to a solidification facility using a concentrated waste liquid transfer device. The solidification process is then carried out.

FIG. 2 is a configuration diagram showing a conventional concentrated waste liquid cleaning device that cleans the concentrated waste liquid transfer device with washing water.

In FIG. 2, reference numeral 1 indicates a concentrated waste liquid tank that stores concentrated waste liquid 2 for a certain period of time, which is generated by concentrating chemical waste liquid discharged from a nuclear power plant. A concentrated waste liquid transfer pipe 3 for transferring to a waste liquid solidification treatment system (not shown) is connected. A tank outlet valve 4 is interposed at the outlet of the concentrated waste liquid tank 1 of the concentrated waste liquid transfer pipe 3, and a transfer pump 5 is interposed in the middle of the concentrated waste liquid transfer pipe 3. A wash water pipe 6 capable of supplying wash water for cleaning the inside of the concentrated waste liquid transfer pipe 3 is connected downstream of the tank outlet valve 4 of the concentrated waste liquid transfer pipe 3 and upstream of the transfer pump 5 . The upstream side of the wash water pipe 6 is connected to a relatively high-purity make-up water system within the nuclear power plant. The wash water pipe 6 is provided with a wash water inlet valve 7 that is closed except during washing.

In this concentrated waste liquid facility, various chemical waste liquids generated in conjunction with the operation of a nuclear power plant are subjected to concentration distillation treatment, and then become concentrated waste liquid 2 and flow into a concentrated waste liquid tank 1 . When the liquid level of the concentrated waste liquid 2 reaches a predetermined value in the concentrated waste liquid tank 1, this is detected by a liquid level detector (not shown), the tank outlet valve 4 is opened, and the transfer pump 5 is operated. , and transferred to a waste liquid solidification treatment system (not shown). After transferring the concentrated waste liquid 2, the concentrated waste liquid transfer piping 3
In order to wash away the concentrated waste liquid 2 remaining in the tank and prevent corrosion of the concentrated waste liquid transfer pipe 3, the wash water outlet valve 7 is opened, and the make-up water is used as wash water to flow from the wash water pipe 6 into the concentrated waste liquid transfer pipe 3. inject. Then, while cleaning the inside of the concentrated waste liquid transfer pipe 3 with washing water, the inside of the concentrated waste liquid transfer pipe 3 is cleaned by flowing the washing water to the waste liquid solidification treatment system.

(Problem to be Solved by the Invention) The concentrated waste liquid 2 that remains in the concentrated waste liquid transfer pipe 3 after the concentrated waste liquid 2 is transferred is a concentrated chemical waste liquid, and is likely to precipitate, and eventually the concentrated waste liquid transfer pipe 3 It corrodes, so you need to wash it off as much as possible.

However, increasing the amount of washing water to improve the cleaning effect dilutes the concentrated waste liquid 2, that is, increases the amount of waste liquid. For this reason, there was a problem in that the processing efficiency of the entire waste liquid solidification equipment (not shown) was reduced.

The present invention has been made in consideration of the above circumstances, and can improve the processing efficiency of the waste liquid solidification treatment system by reducing the amount of secondary waste generated by cleaning the concentrated waste liquid transfer equipment. The purpose of the present invention is to provide a concentrated waste liquid cleaning device.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a concentrated waste liquid tank for storing concentrated waste liquid obtained by concentrating waste liquid, and a concentrated waste liquid in this concentrated waste liquid tank is transferred to a waste liquid solidification treatment system. A concentrated waste liquid transfer pipe, a tank outlet valve provided at the concentrated waste liquid tank outlet of the concentrated waste liquid transfer pipe, a transfer pump provided in the middle of the concentrated waste liquid transfer pipe, and the tank outlet valve of the concentrated waste liquid transfer pipe. In the concentrated waste liquid cleaning device, which is connected to the downstream side and is equipped with a wash water pipe that can introduce washing water into the concentrated waste liquid transfer pipe, and a wash water inlet valve provided in the wash water pipe, the concentrated waste liquid transfer is performed. A solidification system inlet valve that can close off the concentrated waste liquid transfer piping is provided on the waste liquid solidification system side of the piping.

(Function) After the concentrated waste liquid in the concentrated waste liquid tank is transferred to the waste liquid solidification treatment system through the concentrated waste liquid transfer piping, the tank outlet valve is closed.
Stop the transfer pump. At the same time as this transfer is completed, the wash water inlet valve is opened, wash water is injected from the wash water pipe into the concentrated waste liquid transfer pipe, the concentrated waste liquid transfer pipe is filled with wash water, solidified, and the treatment system inlet valve is closed. After leaving this state for a certain period of time to dilute the remaining concentrated waste liquid in the concentrated waste liquid transfer pipe, the solidification treatment system inlet valve is opened and the remaining concentrated waste liquid and washing water are discharged to the waste liquid solidification treatment system.

As a result, the cleaning effect of the transfer pump and concentrated waste liquid transfer piping can be improved with less amount of washing water than before, which reduces the amount of secondary waste generated and improves the processing efficiency of concentrated waste liquid. can be done.

(Example) Hereinafter, an example of the concentrated waste liquid cleaning apparatus according to the present invention will be described with reference to FIG.

In Figure 1, reference numeral 1 indicates a concentrated waste liquid 2 produced by concentrating and distilling chemical waste liquid generated from a nuclear power plant.
A concentrated waste liquid tank 1 is shown in which the concentrated waste liquid is stored for a certain period of time, and a concentrated waste liquid transfer pipe 3 is connected to the lower part of the concentrated waste liquid tank 1 to transfer the concentrated waste liquid 2 to a waste liquid solidification treatment system (not shown). A tank outlet valve 4 is interposed at the outlet of the concentrated waste liquid tank 1 of the concentrated waste liquid transfer pipe 3, and a transfer pump 5 is interposed in the middle of the concentrated waste liquid transfer pipe 3.

On the downstream side of the tank outlet valve 4 of the concentrated waste liquid transfer pipe 3 and the upstream side of the transfer pump 5, the concentrated waste liquid transfer pipe 3 supplies wash water for cleaning the inside of the concentrated waste liquid transfer pipe 3 and the inside of the transfer pump 5.
A wash water pipe 6 that can be injected into the tank is connected. The upstream side of this wash water pipe 6 is connected to a makeup water system of relatively high purity within the nuclear power plant. This wash water pipe 6 is provided with a wash water inlet valve 7 which is closed except during washing.

Further, a portion of the concentrated waste liquid transfer piping 3 on the downstream side of the transfer pump 5 is closed when the concentrated waste liquid transfer piping 3 and the transfer pump 5 are filled with cleaning water and diluted, thereby closing the concentrated waste liquid transfer piping 3. A possible solidification treatment system inlet valve 8 is interposed.

In this concentrated waste liquid cleaning device, various chemical waste liquids generated in conjunction with the operation of a nuclear power plant are subjected to concentration distillation treatment, and then flow into a concentrated waste liquid tank 1 . When the liquid level in the concentrated waste liquid tank 1 reaches a predetermined value, a liquid level detector (not shown) detects this and opens the tank outlet valve 4, and the transfer pump 5
is operated to transfer the concentrated waste liquid 2 in the concentrated waste liquid tank 1 to a solidification facility (not shown) via the concentrated waste liquid transfer pipe 3 and the solidification processing system inlet valve 8. Completion of transferring the concentrated waste liquid 2 is determined by low liquid level detection by the liquid level detector, and the tank outlet valve 4 is
, and the transfer pump 5 is stopped.

At the same time as this transfer is completed, the wash water inlet valve 7 is opened to fill the concentrated waste liquid transfer pipe 3 with wash water, and the solidification treatment system inlet valve 8 is closed. After leaving this state for a certain period of time and sufficiently diluting the remaining concentrated waste liquid 2 in the concentrated waste liquid transfer pipe 3 and the transfer pump 5 with washing water, the solidification treatment system inlet valve 8 is opened.
The remaining concentrated waste liquid 2 and wash water are discharged to the solidification equipment. As a result, when cleaning the concentrated waste liquid transfer piping 3 and the transfer pump 5, it is possible to improve the cleaning effect with less cleaning water than the conventional cleaning water amount, thus reducing the amount of secondary waste generated and processing the concentrated waste liquid 2. Efficiency can be improved.

In addition, although the above embodiment describes a concentrated waste liquid cleaning device in a nuclear power plant, the present invention is not limited thereto, and can be similarly applied to a concentrated waste liquid cleaning device in a chemical industrial plant or other plants.
It has a similar effect.

〔Effect of the invention〕

As explained above, the present invention provides a solidification system inlet valve that can close off the concentrated waste liquid transfer pipe on the waste liquid solidification system side of the concentrated waste liquid transfer pipe, so that the concentrated waste liquid transfer pipe and the transfer pump are filled with wash water. As a result, the residual concentrated waste liquid can be diluted and washed efficiently, and the processing efficiency of the concentrated waste liquid can be improved by reducing the amount of secondary waste generated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a concentrated waste liquid cleaning apparatus according to the present invention, and FIG. 2 is a block diagram showing a conventional concentrated waste liquid cleaning apparatus. 1... Concentrated waste liquid tank, 2... Concentrated waste liquid, 3...
Concentrated waste liquid transfer piping, 4...Tank inlet valve, 5...Transfer pump, 6...Washing water piping, 7...Washing water inlet valve, 8...Solidification treatment system inlet valve.

Claims (1)

[Claims] A concentrated waste liquid tank that stores the concentrated waste liquid obtained by concentrating the waste liquid, a concentrated waste liquid transfer pipe that transfers the concentrated waste liquid from this concentrated waste liquid tank to the waste liquid solidification treatment system, and a concentrated waste liquid transfer pipe installed at the concentrated waste liquid tank outlet of this concentrated waste liquid transfer pipe. A tank outlet valve, a transfer pump provided in the middle of the concentrated waste liquid transfer piping, and a cleaning device connected to the downstream side of the concentrated waste liquid transfer piping from the tank outlet valve and capable of introducing cleaning water into the concentrated waste liquid transfer piping. In a concentrated waste liquid cleaning device equipped with a water pipe and a wash water inlet valve provided on the wash water pipe, the solidification processing system inlet can close the concentrated waste liquid transfer pipe to the waste liquid solidification processing system side of the concentrated waste liquid transfer pipe. A concentrated waste liquid cleaning device characterized by being equipped with a valve.