JPS58105099A - Gaseous waste processing 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 The invention relates to a gaseous waste treatment system for treating exhaust gas from the main condenser of a nuclear power plant.

Hypothetical background of the invention and its problems In a boiling water nuclear power plant, gases generated in the reactor core are passed along with steam (-directly through the turbine to the main condenser (-directly to the main condenser). is external (- is ejected,
In order to reduce the radioactivity level of this waste,
Gaseous waste treatment equipment is provided. This gaseous waste treatment equipment consists of an ejector connected to the main condenser, a preheater, a recombiner, a condenser, a precooler, a hold-up piping, a dryer, a pre-color filter, an activated carbon tower, an equipment filter, a vacuum pump.

The stacks are connected in series (two pipes are connected. One is the pre-forming system. During the operation of the above-mentioned power plant, the exhaust gas extracted from the main condenser is transferred from the main condenser to the ejector (second), which is generated in the reactor. The preheater contains an emissive rostrum.

After removing the hydrogen and moisture from the exhaust gas through re-extraction, water purification, and pre-preservation equipment, it is emitted with a short half-life by passing through hold-up piping for approximately 30 minutes or more. attenuate the ability. Next, after removing moisture in a dryer and passing through a pre-filter, the activated carbon tower utilizes the charcoal coating effect to significantly reduce radioactivity (2), and then passes through a post-filter to become a seedling. Exhaust gas is discharged from the stack into the atmosphere using a vacuum pump.

This gaseous waste treatment equipment connects equipment in series to form a process line as described above, and the fluid drive is carried out by an ejector installed at the inlet of the treatment equipment and a vacuum installed at the outlet of the treatment equipment (2). Although this was omitted in the above explanation, in order to increase the safety of this processing equipment, each equipment is divided into two lines, and piping is being installed (: = valves are installed at various locations, and drains are installed at various locations.) Auxiliary piping for discharge, instrumentation, and other purposes is provided.The valves used in the soil process line are provided to meet the operational needs of opening and closing, and may be gate valves or globe valves. Therefore, a check valve was not used.By the way, in equipment in a gaseous waste treatment system, a recombiner is used as an equipment with a so-called fixed bed having an internal ("l-granular filling").

There is a WIJ R filter and an activated carbon tower. These devices are designed with the flow direction of the machine DF'J constant C2, so if the flow direction is reversed (-), it may cause a large disturbance in the horizontal state of the filling surface of the filling material, or the filling material may be However, there is usually no risk of backflow occurring in the raw process line. If the waste treatment system remains under negative pressure and the test tap valve on the downstream side of the activated carbon tower is opened to the atmosphere, the upper
Air may flow backward toward the hold amplifier piping on the t-side or the large negative pressure container of the activated carbon tower, and backflow may occur during measurement adjustments during various periodic inspections. Therefore, the conventional gaseous waste treatment equipment has two shortcomings: the stability of the solid bed.

Purpose of the present invention The present invention has been made in order to eliminate the above-mentioned drawbacks. The adverse effect of b
The purpose of the present invention is to provide a gaseous waste treatment device which is capable of shutting off the TIG.

The inventive structure of Hikari is to treat the exhaust gas extracted from the main condenser of a boiling water nuclear power plant (injector, preheater, recombiner.

Enoki water dispenser, pre-cooler, hold-up piping, dryer.

Prefilter, activated carbon tower, postfilter, vacuum pump,
In this l1lki stack (in a two-part pipe-connected gaseous waste treatment equipment k, the prefilter and the activated carbon column are devices with a fixed bed, and the A check valve is provided immediately after each outlet.

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment of a gaseous waste treatment apparatus according to the present invention will be described with reference to the drawings.

The equipment and equipment arrangement forming the process line of the present invention are the same as those of conventional gas @leaf processing equipment. That is, main condenser 1 (- connected ejector 2, preheater 3. recombiner 4. condenser 5. precooler 6° hold-up piping 7.
Dryer8. Front 1 secondary filter 9, activated carbon tower 10. Postfilter 11. Vacuum pump 12゜stack 13 is connected in series (with two pipes) to form a process line.
Various parts (2) are the same as conventional gaseous waste treatment equipment in that there are valves and auxiliary piping that are not shown. Only taps 15, 16, 17 for performance testing of activated carbon column 10 or postfilter 12 are shown.

The gaseous waste treatment apparatus according to the present invention is provided with a check valve 18 and a check valve 19 immediately after the outlet side of the filter 9 and immediately after the outlet side of the activated carbon column 10, respectively. This is a device with a fixed bed, the recombiner 4. Prefilter 9. A check valve is provided at the outlet of the activated carbon column 10 only if there is a device with a large capacity upstream of the device, or if the device has a large capacity. That is, the prefilter 9 has a hold-up pipe W7 located on the upstream side, and the activated carbon column 10, which has the hold-up pipe 7 on the upstream side and has a large volume, has a back check at each outlet. The valves 18 and 19 are provided.

Next, its effect will be explained.

If the condenser drain line 14 is opened to the atmosphere while the vacuum pump 12 maintains a negative pressure during a periodic inspection of the gaseous waste treatment apparatus according to the present invention having the configuration described above, the atmosphere will be First, it flows into the condenser 5, and most of it flows to the downstream side where the large-capacity 7λ reactor is held, so there is almost no possibility that it will flow back into the recombiner 4. On the other hand, when the test tap 15 is opened for test preparation, the air flows into the activated carbon tower 10 on the downstream side and at the same time tries to flow back into the volumetric hold up piping 7 side, and at that moment the backflow is stopped. The valve closes and prevents backflow in the prefilter 9.

When the test tap 15 or 16 is opened, the atmosphere suddenly flows upstream to create a large volume under negative pressure rather than the vacuum pump 14i11 (two backflow check valves). Close 19 to prevent backflow.Like this (
-1 The check valve is a pre-filter with a fixed bed 9.
After NK of the activated carbon column 10 (- is placed between this equipment and the check valve (2) is the drain pipe that may open the dog 74 - V' instrumentation tap etc. is not installed, so the fixed bed ( 2. Backflow can be easily prevented.

Therefore, we pay attention to the operational situation during the adjustment period β or periodic horizontal storage period of the gaseous waste treatment equipment, which has not been given much attention in the past, and consider the atmospheric openings in the gaseous waste treatment equipment. li', ii constant 1
It is possible to ensure the integrity of the fixed bed part of equipment with /l(.

As described in detail of the invention (2, the invention is based on the two outlets 11111 (two stops) of the special slurry of the upper process line of the gaseous waste treatment equipment, namely the pre-filter and live charcoal. By providing a valve, it is possible to prevent the flow from flowing into the parts where the transmitter is fixed, so it is possible to conduct inspections or regular inspections of the gaseous waste treatment equipment. 11 cJ for making confectionery;
A leaf processing device can be provided.

[Brief explanation of drawings]

The figure shows an example of an uninvented invention. 1..." Mitakesui a, > 2... Ebifuta 3
... Preheater 4 ... Recombiner 5 ... Condenser 6 ... Precooler 7 ... Hold-up distribution 8 ... Dryer 9 ... Prefilter 10 ...
・Activated carbon column 11...Fixed filter 12...Vacuum pump 13...Stack] 4...Condenser drain discharge line 15, 46.17...Test tap 18, 19...Reverse stop valve

Claims (1)

[Claims] 1)? $ ) L! ＃To treat the exhaust gas extracted from the main condenser of the Mizugata Nuclear Power Station (Niejector, preheater. Recombiner, water heater, precooler, hold-up piping. Drying stand, face ■ Straight filtration + 7'? 3.1 fresh ash - 1 lot, post-direct filtration. JCQ pump, stack in this order (gas IiA fruit processing device with two-part pipe connection (two parts, immediately after the outlet side of the pre-filter and Immediately after the outlet side of the activated carbon column (2) is a gaseous waste treatment device characterized in that two check valves are provided (2) The front iM filter and the activated carbon column are equipped with equipment having a fixed bed. Claim 1, characterized in that (
Gaseous waste treatment device 00 according to 1.