JPS5931498A - Condensate hydrogen oxygen concentration control equipment - 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 present invention relates to condensate hydrogen oxygen #dust control equipment used for corrosion prevention of piping equipment through which condensate passes, such as boiling water) Jf
The present invention relates to a hydrogen oxygen concentration control equipment suitable for controlling the cumulative concentration of water violet acid in condensate to achieve passivation corrosion protection, particularly in neutral pure water and radiation environments, for corrosion protection of piping equipment in T-water type nuclear power plants.

Conventionally, hydrogen/oxygen degree control of condensate in a neutral pure water environment for passivation and corrosion protection of V distribution equipment in a boiling water nuclear power plant has been carried out based on the reactor pressure as shown in Figure 1. The steam coming out of the container 1 and passing through the turbine 2 becomes condensed water in the condenser 3;
When the incoming water that has been pumped offshore passes through the drain pipe 7 from the TF pump 6, all the oxygen gas is injected into the condensate system from the pump 12 through the pipe 13, and the water remains in the bath during draining. 20~20
01) Low-pressure feed water heater, which is downstream equipment, controlled to pbOa degrees8. Water supply pump 9 and city) E silk water addition 5
This prevents corrosion of the vessel 10, the parts, and g 11 qυ, thereby successfully preventing the introduction of waste materials into the reactor pressure vessel 1 and reducing the radioactivity of Nolant.

By the way, in recent years, hydrogen peroxide f■202 has been produced as a product of the radioactive decomposition of water under radiation in the Nori reactor vessel.
Since IW and oxygen 02 are generated and the amount of IW IP'M is more than safe, we have begun to investigate corrosion prevention methods to reduce these dissolved phenomena. For example, a method is adopted in which the inside of the single reactor pressure tank 1 is vacuum degassed before starting up the nuclear reactor. During the damage operation, this vacuum degassing is not effective, so the accuracy of the bathtub drinking system and water meter in the C knee rectangle inside the furnace is at full accuracy. The level is about 200 ppb in terms of alcohol/element, or is it this for the austenitic stainless steel copper in the sub-cooling system of the nuclear reactor? It has been found that lowering the corrosion resistance to a temperature of 1.1 is more effective in further alleviating corrosion dust phenomena such as stress corrosion cracking. As a solution to this problem, a water-based one-ship one-ship control method in which hydrogen is injected, as shown in FIG. 2, has been considered. This is done by passing @ current from the countercurrent electrolytic etch 24 to the blocking poles and anodes 22 and 23 of the electrolytic vessel 20 having ljM walls 21, and the current ≠ taking out hydrogen and oxygen generated by electrolysis of water in the vessel 20. This is a method in which hydrogen is injected in a gaseous state from the v25 and the nozzle 26 into the reactor cooling system water pipe 7. 27
28 is a pipe for allowing a part of the upstream water to flow into the analyzer 20 and partially injecting oxygen in the form of a gas into the rear water pipe 7; 28 is a pipe for discharging excess oxygen.

Compared to the conventional method shown in Fig. 1, which involves injecting oxygen gas from a train tank, the fCC ice water, hydrogen, and oxygen line control method shown in Fig. 2 has operational advantages such as eliminating the need to repeatedly exchange cylinders. Although there are advantages, since hydrogen is injected in a gaseous state, the injection of water into the water system may be unstable or defective, and cavitation of the pump downstream of the injection point or stalls in the heat exchanger may occur. It has the disadvantage of being dull.

Purpose of the present invention (-) In view of the above-mentioned drawbacks of the prior art, stable hydrogen and oxygen are injected into the condensate system to improve dilution after water injection and to reliably control the concentration of the water that is drained. Once you explore $, we will provide you with control equipment.

Hydrogen oxygen concentration control of the present invention 1] The equipment has 171 liters of water.
gaseous decomposition of '11 with At, electric power F, 'K]; Separate injection channels 151i and 151i for pumping and injecting the hydrogen and oxygen generated near the anode into the aqueous system after heating them to 5K so as not to mix them with each other and injecting them into the aqueous system after receiving the above injection; 4. A hydrogen meter and an oxygen meter that detect the difference concentration and acid concentration of water, respectively, and the detected water; 4. - A control device for controlling the flow of the hydrogen aqueous solution and 1 g≠water bath in each of the above-mentioned separate injection channels according to the W' number and the oxygen concentration.

Hereinafter, an example of the fire axis of the present invention will be explained with reference to FIG.

In this figure, parts corresponding to those in the prior art shown in FIG. 2 are given the same reference numerals. A portion of the outgoing water flowing through the rear water pipe 7 is supplied to the valve 43. Water is supplied to the [N container 2o] through a conduit 27 containing a starch 42° valve 44. Electrolytic container 2o
Inside, the shade 4iI is powered by the DC power supply 24! , 22
Hydrogen and oxygen are generated near the anode 23 as a result of water electrolysis. The anodes and the partition wall 21 between the anodes separate hydrogen and oxygen so that they do not mix with each other. The generated hydrogen is in a state dissolved in water, that is, in an aqueous solution state, when the hydrogen is passed through the regulating valve 33.
The water is injected into the rear water pipe 7 through the pipe 25 containing the water. The generated oxygen is also injected into the outgoing water pipe 7 through the pipe 29 including the valve 39 in the form of an aqueous solution dissolved in water. The concentrations of the hydrogen and oxygen injected in this manner in the incoming water after injection are detected by a hydrogen meter 35 and an oxygen meter 41 provided downstream of the injection point in the condensate pipe 7, and the detected concentration Electric signals corresponding to the 25 and 29 are sent to the regulators 34 and 4o, which adjust the valves 33 and 39 to control the flow rates of the hydrogen aqueous solution and the oxygen aqueous solution passing through the valves 25 and 29, respectively. . In this way, the cumulative hydrogen and vV concentration of the water in the water supply to the reactor is better maintained.

- force, to prevent excessive hydrogen and oxygen from being generated in the ``d1 disintegration device 20 +r-i flow ``I+J, the army of source 24 has L 71
．． ! I side 1 to 1'! I Set the adjustment device 34.40 aside. Further, hydrogen and acid radical gas generated in excess in the electrolytic vessel 20 are stored in the hydrogen storage A'λ device 15° 32 and the fM storage device 38 via the gas-liquid separation header 30, 36 and the arrangement I31 +37, respectively. Ru. This stored gas can be used for other suitable uses within the power generation system.

The other firearm example shown in FIG. 4 is similar to the example shown in FIG. It is equipped with a tank 1.750, 51 and a square 52.53 for injecting hydrogen and acid groups into the water pipe 7 as backup. Valves 52 and 53 are regulated by both adjustment device lines 34 and 40.

As explained above, according to ``Fudyu'', stable hydrogen and woodblocks are generated using water electrolysis, and each of these is injected into condensate in the form of an aqueous solution, so dilution by injection is possible. It has the advantage that it is good and its strength is good. If you store the hydrogen and oxygen generated in the water 'ltf, m min h・I in the history, and if necessary, inject this into the low water display as a backup 7L, the hydrogen and nitrogen in the water The robustness control 11 can be further improved.

[Brief explanation of drawings]

1 [ηt; boiling water type of boiling water]
FIG. 2 is a schematic diagram showing an example of an ill elevating means. 3 is a schematic diagram showing another conventional example of the rol1 means, FIG. 3 is a system diagram showing one embodiment of the present invention, and FIG. 4 is a system diagram showing another embodiment of kl and misfire j. 1... Nuclear reactor 2... Turbine 3... Water heater 4... Nj? 5...Condensate purification device 7...Bale water pipe 8...Low pressure feed water heater
9... Water supply bonder 10... High pressure water supply heater 11.
...Piping 12...Acid gas 1. ! Empe 20-...
Kankatani device 21... partition wall 22... cathode 2
3...Anode 24...! 116t+: Power supply 25...Water meter/5 injection pipe 27...Condensate? j
P outlet pipe 29...Oxygen Y1 person confirmation 32...Water system storage equipment 34...Hydrogen publication/η adjustment device 35...Hydrogen analysis 38...ri:2 L packaging needle No. 151: Device 40...d element 11 no=jl:i
2(;j1□1f hill 41...Oxygen meter. Figure 1: 2me 1 Figure 3

Claims (1)

[Claims] 1. Direct current? iJ: Mj, an electrolytic vessel for electrolyzing water, an η channel for introducing a part of condensate from the condensate system into the 'iIi answerer, and an anode and an anode near the anode in the electrolytic vessel, respectively. Is it for separate injections in which the generated hydrogen and acid systems are injected into the condensate system in a water bath state so that they do not mix with each other? Ir
, a water shaving element and an oxygen shaving element for detecting the hydrogen enrichment head and oxygen concentration of the condensate in the injected thin ice system, respectively;
According to these detected hydrogen and oxygen concentrations, upper B[
1. Hydrogen acid accumulation control equipment for condensate, comprising a water-hydrogen water bath port in each separate injection path and an open side device for controlling the flow h of an oxygen aqueous solution. 2. The condensate described in Paragraph 1 of the scope of Patent No. 81J, which is characterized in that the electrolytic decomposition of water is monitored by adjusting the surface width current to the electrolytic vessel according to the detected degree of condensation. Hydrogen acid repeatability 71; II equipment. 3. The cumulative hydrogen acidity of the condensate according to claim 1, which is characterized by the fact that it is equipped with a storage device for storing surplus hydrogen and oxygen generated in the electrolytic vessel in gaseous form, respectively. crawl"
Your equipment. 4. A feature characterized by comprising a pipe line and a valve in the pipe line for injecting the water system and oxygen stored in the storage device into the water system as needed [Mh requirement range as described in item 3] Condensate hydrogen oxygen threshold system side 1 equipment.