JPS59164999A - Liquid waste neutralization device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a neutralization device for waste liquid generated from a nuclear power plant, and particularly to a waste liquid neutralization device suitable for completely neutralizing waste liquid with a high radiation dose.

[Prior art]

Previously, the neutralized liquid was pumped to a mixing tank, but maintenance of the pump was a problem under high radiation levels.
There is also a backup machine installed, which requires a lot of maintenance time and exposure to radiation.

[Purpose of the invention]

An object of the present invention is to provide a waste liquid neutralization device suitable for a nuclear power plant, which is free of wear parts such as pumps, and has fewer maintenance and failure-prone parts.

[Summary of the invention]

1) Measurement of the neutralization device is carried out by free fall by gravity (gravity) by operating all valves, and injection into the waste liquid mixing tank is also carried out by free fall.

2) Pumping the injection into the waste liquid mixing tank with a portion of the waste liquid.

3) Transfer the injection into the waste liquid mixing tank by a jet pump with a portion of the waste liquid.

[Embodiments of the invention]

An embodiment of the present invention will be explained below with reference to FIG.

First, the waste liquid to be neutralized is transferred to the waste liquid mixing tank through all the valves 17, a certain amount is measured by the level cage 8, and the valve 17 is closed in response to the signal.

At this time, the pump 11 is driven at the same time as the pulp 17 is closed while the stopped pulp 19 is closed, thereby completely circulating the waste liquid. At this time, the valve 18 is open, and the waste liquid is measured for PH' by the sampling device 10. The signal is sent to the neutralization controller 6 to calculate the total amount of neutralized liquid, and the level setting device 5 Convert to a value that matches the measured signal. On the other hand, the neutralization liquid is supplied from the neutralization source 3 to the neutralization tank 1.
A certain amount is stored in the level gauge 2. The valve 13 is activated by the signal from the neutralization controller 6.
``i=open, then pal '7'12 opens, and the neutralizing liquid moves from the neutralizing liquid tank\1 to the neutralizing liquid measuring device 4 by its own weight,
While the amount is measured by the level measuring device, the signal is transmitted to the neutralization controller 6.

The neutralization controller 6 compares this signal with all the signals from the sampling device 10 described above, and if a match is found, the controller 9 receives a full closing signal for the valve 12, closes the valve 12, and controls the flow of the neutralizing liquid fl'. Stop at. At this time valve 1
4, 15, and 16 are closed. Next, the bulge 15 is fully opened and the neutralized liquid in the neutralized liquid meter is allowed to fall by its own weight into the waste liquid mixing tank.

This free fall speed due to its own weight is arbitrarily determined by the opening degree of the valve 13 or the opening degree of the valve 15. The drop is confirmed by the level measuring device 5, and in response to this confirmation signal, the controller 9 operates the pump 11 to perform mixing for neutralization. That is, the pump 11 causes the valve 18 to
Between all the waste liquid mixing tanks! Neutralize while circulating the waste liquid. This neutralization effect is measured by the sampling device 10, and if neutralization is insufficient, neutralization is performed again in the above-mentioned order. When neutralization is completed, the valve 18' is closed, the valve 19 is opened, and the waste is treated separately by the pump 11 in a waste treatment line (not shown). On the other hand, in the case of over-neutralization, although not shown, neutralization can be achieved by injecting a liquid with a reverse PH through all the same lines.

On the other hand, as soon as neutralization is completed, valve 13.15 is closed, valve 16.14 is opened, and cleaning water flows into the neutralizing liquid measuring device 4 from a cleaning water source (not shown) to clean the inside. The waste liquid from the cleaning layer is transferred to a drain tank (not shown) by falling under its own weight or by using cleaning water or water pressure.

With the above steps, one cycle of neutralization is completed. This method eliminates the need for the conventional transfer pump for neutralizing liquid, making it possible to greatly simplify the system, and since there is no rotating body, no maintenance is required, and nuclear power This has the effect of reducing radiation exposure, which is a problem unique to power plants, and reducing waste such as consumables.

Fig. 2 is characterized in that a bypass line 26t is provided from the circulation line to the upstream side of the neutralizing liquid measuring device 4 in Fig. 1, so that washing water does not flow into the bypass line 26 during washing. It has 25 check valves. This bypass line 26 is provided to effectively use all of the neutralizing liquid for complete neutralization, and when mixing is performed by the pump 11, the liquid to be neutralized is also pumped to the bypass line 26, and the liquid is neutralized with this liquid. The other operations used to completely neutralize the Japanese liquid are the same as those in the embodiment shown in FIG. 1, and will therefore be omitted.

Figure 3 is characterized in that the jet pump 27 is completely installed on the downstream side of the neutralizing liquid measuring device 4 in Figure 1, and the drive water for this jet pump 27 is bypassed from the waste liquid circulation line. All waste liquid is used by the bypass line 28. In this case, since all of the neutralized liquid can be forcibly transferred, the neutralized liquid measuring device 4 does not necessarily have to be installed above the waste liquid mixing tank 7, and there is an advantage that the installation location can be easily selected.

Figure 4 shows neutralization tank 1 and level gauge 2 in the first prisoner.
There is no system, and the neutralizing liquid measuring device 4 is directly connected to the neutralizing liquid source 3.
The rest of the method for transferring the neutralizing liquid to the first intersection is the same as the first intersection direction, so a complete explanation will be omitted.

In this system, if the neutralizing liquid source 3 has sufficient quantity to send the neutralizing liquid to other systems as well, it will be displayed completely, and the equipment will be simplified, and maintenance elements will be reduced in case of failure of the level switch 2. This will reduce exposure to radiation.

Figure 5 shows the system in Figure 2, and Figure 6 shows the system in Figure 3 without the neutralizing liquid tank 1 and level gauge 2, and the effect is the same as in Figure 4.
The system is the same as that shown in the figure, and the functions are also the same as those in FIGS. 2 and 3, so a description thereof will be omitted.

The advantage of providing the neutralization tank 1 in Figure 1.2.3 is that it can be used as a reserve amount to completely prevent the neutralization operation shown in this figure from becoming impossible if there is not enough volume in the neutralization liquid source 3. It is provided for storage.

As explained above, the waste liquid neutralization device has many advantages such as reduced failure rate, reduced maintenance time, reduced equipment costs, energy saving, and reduced radiation exposure because the neutralizing liquid transfer part does not have any moving functions such as rotating bodies. It is.

〔Effect of the invention〕

The effects of the present invention are as follows: (1) Since there is no rotating body (pump), the working time under high radiation is reduced by 100 hours/year, leading to a reduction in radiation exposure. (2) Equipment costs will be reduced to 2/3. (3
) Operational efficiency is increased because there are no rotating parts that often fail.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a waste liquid neutralization device according to an embodiment of the present invention, Fig. 2 is a system diagram of a waste liquid neutralization device other than that shown in Fig. 1, and Fig. 3 is a system diagram of a waste liquid neutralization device other than those shown in Figs. 1 and 2. Neutralization @ negative system diagram, Figure 4 is a system diagram of waste liquid neutralization equipment other than Figures 1 to 3, Figure 5 is a system diagram of waste liquid neutralization equipment other than Figures 1 to 4, FIG. 6 is a system diagram of a waste liquid neutralization device other than those shown in FIGS. 1 to 5.

Claims (1)

[Scope of Claims] 1. A neutralizing liquid tank installed above a waste liquid mixing tank in a fixed quantity injection device for neutralizing liquid in a device for completely neutralizing acidic or alkaline waste liquid generated from a nuclear power plant. , neutralizing liquid measuring device, neutralizing liquid level measuring device of neutralizing liquid measuring device,
Calculate the required amount of neutralizing liquid from a metering operation valve group, a control controller for the valve group, a sampling device for measuring the pH' of the liquid being neutralized, and a PH multiplication signal of the sampling device 7, A waste liquid neutralization device comprising a neutralization controller that generates an adjustment signal for the amount of neutralized liquid by comparison with a level signal from a level measuring device for the neutralized liquid.2.Claim 1. A waste liquid neutralization device characterized by forcing all of the neutralized liquid to flow into the waste liquid mixing tank at an arbitrary pressure from above a neutralized liquid measuring device. 3. In claim 1, the jet pump used for the pressure liquid during waste liquid mixing is installed below the neutralized liquid measuring device, and the neutralized liquid in the neutralized liquid measuring device is forcibly mixed with the waste liquid. The waste liquid neutralization device is characterized by allowing it to flow into the tank.