JP2011163828A - System and method for injecting agent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system and a method for injecting agents which attain the injection of two or more kinds of agents into reactor water in a nuclear power plant at the same time and achieve the low-cost and rapid introduction of themselves. <P>SOLUTION: The system 1 for injecting agents, which injects the water containing agents into a system using water in a power generation plant 2 by way of pipes 5 for it, includes a circulation system 10 with a circulation pipe 11, a circulation pump 12 and a mixing tank 13, a zinc injection system 20 for injecting the water containing zinc into the circulation system 10, an anticorrosive injection system 30 for injecting the water containing an anticorrosive into the circulation system 10, an iron injection system 40 for injecting the water containing iron into the circulation system 10, a water conditioning substance injection system 50 for injecting the water containing a water conditioning substance into the circulation system 10, and a sampling system 60 for sampling the water containing the agents in the circulation system 10. The pipes 5 for the power generation plant are connected to the circulation system 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chemical injection system for injecting, in a nuclear power plant, a corrosion-inhibiting chemical that suppresses corrosion of a metal material constituting the nuclear power plant in contact with high-temperature water, and a chemical for reducing exposure such as reactor piping. The present invention relates to a drug injection method.

  In a boiling water nuclear power plant, oxygen, hydrogen peroxide, etc. generated by radiolysis of water in a radiation field are present in reactor water. Stainless steel and nickel-base metals are usually used as materials for metal structural materials in nuclear power plants, but these stainless steels and nickel-base metals are oxygen, excess metals in high temperature environments such as nuclear reactors. It is known to cause stress corrosion cracking in the presence of hydrogen oxide. For this measure, conventionally, in a nuclear power plant, hydrogen injection technology for reducing the concentration of oxygen and hydrogen peroxide in the reactor water by injecting hydrogen from a water supply system has been studied.

  When the concentration of oxygen and hydrogen peroxide in the reactor water is reduced using this hydrogen injection technique, the corrosion potential of the metal structural material is lowered. Since the occurrence of stress corrosion cracking in the structural material and the crack growth rate depend on the corrosion potential, the lower the corrosion potential, the more the cracking of the structural material and the crack propagation are suppressed. For this reason, if the concentration of oxygen and hydrogen peroxide in the reactor water is reduced, the occurrence of cracks and the progress of cracks in the metal structural material can be suppressed.

  For example, in Patent Document 1 (Japanese Patent No. 2624906), hydrogen is injected after a noble metal such as Pt or Rh is deposited on the surface of the reactor structural material, and the reaction with hydrogen is accelerated to increase the anode current. Thus, a noble metal injection technique for reducing the corrosion potential is disclosed.

  Recently, the use of a photocatalytic reaction has attracted attention as a method for reducing the corrosion potential of metal structural materials. When a photocatalyst is disposed on the surface of a metal member, which is a structural material, and irradiated with light having a wavelength in the vicinity of ultraviolet rays, the corrosion potential of the metallic structural material can be lowered by the action of electrons activated by a photoexcitation reaction. This reaction improves the reaction efficiency when a precious metal is present in the vicinity of the photocatalyst.

  For example, in Patent Document 2 (Patent No. 4094275) and Patent Document 3 (Patent No. 4043647), a high-performance photocatalyst in which a photocatalyst or a precious metal is previously attached to the surface of a metal structure member is attached and generated in the core. It is disclosed that the corrosion potential during operation is lowered by causing this reaction using Cherenkov light.

  By the way, in nuclear power plants, in addition to the above-mentioned corrosion countermeasures, exposure reduction countermeasures are also required. As a measure for reducing the exposure, a technique of injecting zinc into a nuclear reactor is known.

  For example, in Patent Document 4 (Japanese Patent Application Laid-Open No. 8-220293), the injection amount is controlled so that the zinc concentration in the furnace becomes several ppb, and the oxide film property on the surface of the structural material is changed to change the reactor water. It is disclosed that the adhesion of cobalt 60 can be suppressed.

  As another technique for reducing exposure, a technique for controlling the iron concentration in the reactor water while injecting iron into the reactor water is known. For example, in Patent Document 5 (Japanese Patent Laid-Open No. 2009-2641973), a small amount of iron is injected during operation, and the iron concentration in the reactor water is controlled to 0.05 to 0.5 ppb, and is generated in the core portion. It is disclosed to remove radionuclides from reactor water by ferritizing ions on the fuel rod surface.

Japanese Patent No. 2624906 Japanese Patent No. 4094275 Japanese Patent No. 4043647 JP-A-8-220293 JP 2009-264773 A

  The anticorrosion technique using the photocatalyst and the exposure reduction technique in which zinc or iron is injected are all techniques for injecting a solution, dispersed particles, or the like into the reactor system. However, each of the above injection systems is made into a single device, and an injection system combining these has not been developed. For this reason, when each said injection | pouring technique is applied to a nuclear power plant, each injection | pouring system must be constructed | assembled separately and installed. As described above, in applying the above technique to a nuclear power plant, there are problems in that initial cost is required and time for system introduction is required.

  It is an object of the present invention to provide a drug injection system and a drug injection method that can simultaneously inject a plurality of types of drugs into reactor water of a nuclear power plant and can be introduced quickly and at low cost.

  The present invention uses a drug injection system separated from a water use system of a power plant, and after preparing water containing a plurality of types of drugs in this drug injection system so that water quality and chemical species concentration are desired, According to the drug injection system that introduces the prepared water into the water use system of the power plant, multiple types of drugs can be injected into the water use system of the power plant at the same time, and the drug injection system can be quickly and cost-effectively. It has been found out that it can be introduced.

  A drug injection system according to the present invention solves the above-described problem, and is a drug injection system that injects drug-containing water into a water use system of a power plant via a power plant pipe, wherein the drug-containing water is A circulation system having a circulation pipe for circulation, a circulation pump for circulating the drug-containing water in the circulation pipe, a mixing tank provided in the circulation pipe for preparing the drug-containing water, and zinc in water A zinc injection system for injecting zinc-containing water containing a substance from a zinc-containing water tank into a circulation pipe of the circulation system, and an anticorrosive containing water containing an anticorrosive agent or an anticorrosive generating raw material in the water from the anticorrosive containing water tank. An anticorrosive injection system for injecting into the circulation pipe of the system, an iron injection system for injecting iron-containing water containing iron-containing substances into the water from the iron-containing water tank to the circulation pipe of the circulation system, and water quality in the water A water quality adjusting substance injection system for injecting water quality adjusting substance-containing water containing a regulating substance from a water quality adjusting substance-containing water tank into a circulation pipe of the circulation system, and a sampling system for collecting the drug-containing water in the circulation system The power plant piping is connected to a circulation piping of the circulation system.

  The drug injection method according to the present invention solves the above-described problems, and is a drug injection method using a drug injection system that injects drug-containing water into a water use system of a power plant through a power plant pipe. The drug injection system is provided with a circulation pipe through which the drug-containing water flows, a circulation pump for circulating the drug-containing water in the circulation pipe, and the drug-containing water provided in the middle of the circulation pipe. A circulation system having a mixing tank, a zinc injection system for injecting zinc-containing water containing a zinc-containing substance into water into a circulation pipe of the circulation system, and an anticorrosive-containing water containing an anticorrosive or an anticorrosive-producing material in the water. An anticorrosive injection system for injecting into the circulation pipe of the circulation system, an iron injection system for injecting iron-containing water containing an iron-containing substance into water into the circulation pipe of the circulation system, and a water quality adjusting substance in water A water quality adjusting substance injection system for injecting quality adjusting substance-containing water into the circulation pipe of the circulation system, and a sampling system for collecting the drug-containing water in the circulation system. The chemical injection water sampled by the sampling system is analyzed for water quality and chemical species concentration, and the zinc injection is performed based on the analyzed water quality and chemical species concentration analysis data. The zinc-containing water of the system, the anticorrosive-containing water of the anticorrosive injection system, the iron-containing water of the iron injection system, and the water-containing substance-containing water of the water-conditioning substance injection system It is characterized by feedback control of an appropriate injection amount into the circulation pipe of the circulation system.

  According to the medicine injection system and the medicine injection method according to the present invention, it is possible to simultaneously inject a plurality of kinds of medicines into the water use system of the power plant, and the medicine injection system can be quickly and inexpensively introduced.

1 is a schematic configuration diagram showing a first embodiment of a drug injection system according to the present invention. The schematic block diagram which shows 2nd Embodiment of the chemical | medical agent injection | pouring system which concerns on this invention. 1 is a schematic cross-sectional view of a stainless steel test piece prepared in Example 1. FIG. The graph which shows the zeta potential of a titanium oxide. The graph which shows a corrosion potential measurement result. FIG. 3 is a schematic cross-sectional view of a carbon steel test piece produced in Example 2. The graph which shows a thinning test result. The graph which shows a titanium oxide adhesion amount result.

  Embodiments of a drug injection system according to the present invention will be described below with reference to the accompanying drawings.

[First Embodiment]
FIG. 1 is a schematic configuration diagram showing a first embodiment of a drug injection system according to the present invention.

  A drug injection system 1 shown in FIG. 1 is a drug injection system that injects drug-containing water into a water usage system (not shown) of the power plant 2 via a power plant pipe 5.

  The drug injection system 1 includes a circulation system 10 for preparing drug-containing water, a zinc injection system 20 for injecting zinc-containing water into the circulation system 10, and an anticorrosive injection system 30 for injecting anticorrosive-containing water into the circulation system 10. , An iron injection system 40 for injecting iron-containing water into the circulation system 10, a water quality adjustment substance injection system 50 for injecting water-conditioning substance-containing water into the circulation system 10, and a sampling system for collecting drug-containing water in the circulation system 10 60.

  Here, the drug-containing water refers to water obtained by adding one or more kinds of water selected from zinc-containing water, anticorrosive-containing water, iron-containing water, and water-conditioning substance-containing water to water such as pure water. means.

Zinc-containing water means water containing a zinc-containing substance. As the zinc-containing substance, for example, a substance made of at least one of zinc oxide ZnO, zinc carbonate ZnCO ₃ and hydroxide Zn (OH) ₂ is used.

  Zinc-containing water is obtained by adding a zinc-containing substance to water and dissolving or dispersing it. In the zinc-containing water, the zinc-containing substance may be in an ionic or particulate form.

The anticorrosive-containing water means water containing an anticorrosive or an anticorrosive-producing material. As the anticorrosive agent, for example, a substance composed of at least one of TiO ₂ , FeTiO ₃ , Y ₂ O ₃ and La ₂ O ₃ is used. Moreover, as an anticorrosive production raw material, for example, an alkoxide of titanium, an alkoxide of iron, or the like is used.

  The anticorrosive-containing water is obtained by adding an anticorrosive or an anticorrosive-producing material to water and dissolving or dispersing it. The raw material for producing the anticorrosive agent in the anticorrosive agent-containing water may be in an ionic or particulate form.

  Iron-containing water means water containing an iron-containing substance. As the iron-containing substance, for example, a substance composed of at least one of iron fumarate, iron citrate, and iron oxalate is used.

  Iron-containing water is obtained by adding or dissolving or dispersing an iron-containing substance in water. In the iron-containing water, the iron-containing substance may be in an ionic or particulate form.

  The water quality adjusting substance-containing water means water containing a water quality adjusting substance. As the water quality adjusting substance, for example, carbon dioxide, ammonia, oxygen, hydrogen and the like are used. The water quality adjusting substance added to the water quality adjusting substance-containing water may be in any form of gas, liquid or solid.

  The water quality adjusting substance-containing water is obtained by adding a water quality adjusting substance to water and dissolving or dispersing it.

  For example, a carbon dioxide saturated aqueous solution is obtained when carbon dioxide is dissolved and saturated in water, and aqueous ammonia is obtained when ammonia is dissolved in water. Further, when oxygen is dissolved in water, a dissolved oxygen aqueous solution is obtained, and when hydrogen is dissolved in water, a dissolved hydrogen aqueous solution is obtained.

  By adding the water-conditioning substance-containing water to the water in the circulation system 10 or the drug-containing water, one or more kinds selected from the pH, conductivity, viscosity, dissolved oxygen concentration, and dissolved hydrogen concentration of the drug-containing water The item is adjusted. Thereby, drug-containing water having a desired water quality can be prepared in the circulation system 10.

  For example, a carbon dioxide saturated aqueous solution or ammonia water can be used as a pH adjuster for adjusting the pH of the water in the circulation system 10 or the drug-containing water. In addition, the dissolved oxygen aqueous solution and the dissolved hydrogen aqueous solution can be used as an oxidizing agent or a reducing agent that makes water in the circulation system 10 or chemical-containing water into an oxidizing environment or a reducing environment.

  Connected to the circulation pipe of the circulation system 10 is a power plant pipe 5 for injecting the chemical-containing water in the circulation system 10 into the water use system of the power plant 2. The drug-containing water prepared in the circulation system 10 of the drug injection system 1 is supplied to the water use system of the power plant 2 through the power plant pipe 5.

Here, the water use system of the power plant 2 is a water supply system that supplies coolant to the nuclear reactor of the nuclear power plant, a recirculation system that forcibly circulates the coolant in the reactor,
A residual heat removal system (BWR) that removes decay heat and residual heat generated by the core after the reactor is shut down, a residual heat removal system (PWR), and a reactor coolant purification system that purifies the coolant in the reactor; Alternatively, it means at least one system selected from a water supply system and a condensate system of a thermal power plant.

  Moreover, as a metal material used for the water use system | strain of the power plant 2, stainless steel, carbon steel, etc. are mentioned, for example.

(Circulation system)
The circulation system 10 includes a circulation pipe 11 through which the drug-containing water circulates, a circulation pump 12 that circulates the drug-containing water in the circulation pipe 11, and a mixing tank 13 that is provided in the circulation pipe 11 to prepare the drug-containing water. Have

  As shown in FIG. 1, the circulation pipe 11 is formed in a loop shape in which both ends of the pipe are connected to the mixing tank 13. In the circulation system 10, a line composed of the circulation pipe 11 and the mixing tank 13 is also referred to as a circulation loop.

  The circulation pipe 11 is provided with a circulation pump 12 for circulating the drug-containing water in the circulation pipe 11. A known pump is used as the circulation pump 12.

  In the circulation system 10, the medicine-containing water can circulate through the circulation pipe 11 and the mixing tank 13.

  A zinc injection system 20, an anticorrosive injection system 30, an iron injection system 40, and a water quality adjusting substance injection system 50 are connected to the circulation pipe 11 of the circulation system 10. For this reason, the water in the circulation pipe 11 or the chemical-containing water includes water containing zinc containing water from the zinc injecting system 20, water containing anticorrosive from the anticorrosive injecting system 30, and water containing iron from the iron injecting system 40. Water quality adjusting substance-containing water can be injected from the substance injection system 50.

  An external heater 15 is provided outside a part of the circulation pipe 11, specifically, outside the part of the circulation pipe 11 to which the zinc injection system 20, the anticorrosive injection system 30, and the iron injection system 40 are connected. Provided. Thereby, the water circulating through the circulation pipe 11 or the medicine-containing water can be heated to a desired temperature. If the external heater 15 is provided outside the circulation pipe 11, the external heater 15 is less likely to be corroded by the chemical-containing water, and the external heater 15 can be easily installed.

  In the drug injection system 1 shown in FIG. 1, the heater for heating the circulation pipe 11 is an external heater 15 provided outside the circulation pipe 11. However, in the present invention, as the heater for heating the circulation pipe 11, an internal heater provided inside the circulation pipe 11 may be used instead of the external heater 15 or in addition to the external heater 15. When an internal heater is provided inside the circulation pipe 11, the heating efficiency of the drug-containing water by the internal heater is increased.

  The mixing tank 13 is configured to be able to mix internal water or drug-containing water. For this reason, various chemicals injected into the circulation pipe 11 of the circulation system 10 from the zinc injection system 20, the anticorrosive injection system 30, the iron injection system 40, the water quality control substance injection system 50, etc. are sufficiently mixed in the mixing tank 13. Thus, preparation of drug-containing water having a desired water quality and species concentration is possible.

  The circulation pipe 11 in the vicinity of both ends of the mixing tank 13 is provided with valves 14 and 14 so that the flow of water or the drug-containing water in the circulation system 10 can be controlled by opening and closing the valves 14 and 14. It is configured.

  As means for mixing the water in the mixing tank 13 or the medicine-containing water, for example, a stirrer (not shown), a baffle plate provided in the mixing tank 13 or the like is used.

  In the medicine injection system 1 shown in FIG. 1, the mixing tank 13 is not provided with a heater. However, in the present invention, an external heater may be provided outside the mixing tank 13, or an internal heater may be provided inside the mixing tank 13. By providing the mixing tank 13 with an external heater or an internal heater, the water in the mixing tank 13 or the medicine-containing water can be heated to a desired temperature.

  When an external heater is provided outside the mixing tank 13, the external heater is less likely to be corroded by the chemical-containing water, and the installation of the external heater is facilitated. In addition, when an internal heater is provided inside the mixing tank 13, the heating efficiency of the drug-containing water by the internal heater is increased.

  A mixing tank bypass pipe 18 that is a pipe that bypasses the mixing tank 13 is connected to the circulation pipe 11 in the vicinity of both ends of the mixing tank 13. Both ends of the mixing tank bypass pipe 18 are connected to the circulation pipe 11 near both ends of the mixing tank 13, and valves 19 and 19 are provided near both ends of the mixing tank bypass pipe 18. As a result, when the valves 14 and 14 of the circulation pipe 11 are closed and the valves 19 and 19 of the mixing tank bypass pipe 18 are opened, the water or the drug-containing water in the circulation pipe 11 is mixed without passing through the mixing tank 13. A simple closed loop which is a flow flowing through the tank bypass pipe 18 can be formed.

  The simple closed loop is formed when, for example, drug-containing water prepared to have a desired water quality and chemical species concentration is supplied to the water usage system of the power plant 2 via the power plant pipe 5.

(Sampling system)
The circulation pipe 11 of the circulation system 10 is provided with a sampling system 60 that collects drug-containing water in the circulation system 10.

  Specifically, the sampling system 60 includes a sampling pipe 62 branched from the middle of the power plant pipe 5 connected to the circulation pipe 11 of the circulation system 10 and a valve 63 provided on the sampling pipe 62. ing.

  In the sampling system 60, the medicine-containing water in the circulation pipe 11 can be collected by opening the valve 63.

(Zinc injection system)
The zinc injection system 20 is a system that injects zinc-containing water from the zinc-containing water tank 21 into the circulation pipe 11 of the circulation system 10.

  Specifically, the zinc injection system 20 includes a zinc-containing water tank 21 that contains zinc-containing water, a zinc-containing water pipe 22 that connects the zinc-containing water tank 21 and the circulation pipe 11 of the circulation system 10, and zinc-containing water. And a zinc-containing water pump 23 for injecting zinc-containing water in the water pipe 22 into the circulation pipe 11 of the circulation system 10.

  The zinc-containing water tank 21 is a tank that contains zinc-containing water, but may be configured to prepare zinc-containing water. For example, when a stirrer or a heater (not shown) is provided in the zinc-containing water tank 21, it becomes possible to prepare zinc-containing water from water and a zinc-containing substance in the zinc-containing water tank 21.

(Anti-corrosive injection system)
The anticorrosive injection system 30 is a system that injects anticorrosive-containing water from the anticorrosive-containing water tank 31 into the circulation pipe 11 of the circulation system 10.

  Specifically, the anticorrosive injection system 30 includes an anticorrosive-containing water tank 31 that stores the anticorrosive-containing water, and an anticorrosive-containing water pipe that connects the anticorrosive-containing water tank 31 and the circulation pipe 11 of the circulation system 10. 32 and an anticorrosive-containing water pump 33 that injects the anticorrosive-containing water in the anticorrosive-containing water pipe 32 into the circulation pipe 11 of the circulation system 10.

  The anticorrosive agent-containing water tank 31 is a tank for storing the anticorrosive agent-containing water, but may be configured to prepare the anticorrosive agent-containing water. For example, when a stirrer or a heater (not shown) is provided in the anticorrosive agent-containing water tank 31, the anticorrosive agent-containing water is prepared from the water and the anticorrosive agent or the anticorrosive agent-producing raw material in the anticorrosive agent-containing water tank 31. Is possible.

(Iron injection system)
The iron injection system 40 is a system that injects iron-containing water from the iron-containing water tank 41 into the circulation pipe 11 of the circulation system 10.

  Specifically, the iron injection system 40 includes an iron-containing water tank 41 that contains iron-containing water, an iron-containing water pipe 42 that connects the iron-containing water tank 41 and the circulation pipe 11 of the circulation system 10, and iron-containing water. An iron-containing water pump 43 for injecting iron-containing water in the water pipe 42 into the circulation pipe 11 of the circulation system 10.

  The iron-containing water tank 41 is a tank that stores iron-containing water, but may be configured to prepare iron-containing water. For example, when a stirrer and a heater (not shown) are provided in the iron-containing water tank 41, it becomes possible to prepare iron-containing water from water and iron-containing substances in the iron-containing water tank 41.

(Water quality control substance injection system)
The water quality adjusting substance injection system 50 is a system for injecting water quality adjusting substance-containing water from the water quality adjusting substance-containing water tank 51 to the circulation pipe 11 of the circulation system 10.

  Specifically, the water quality adjustment substance injection system 50 includes a water quality adjustment substance-containing water tank 51 that contains water quality adjustment substance-containing water, and a water quality that connects the water quality adjustment substance-containing water tank 51 and the circulation pipe 11 of the circulation system 10. A water conditioning material containing water pipe 52 and a water quality adjusting material containing water pump 53 for injecting the water quality adjusting material containing water in the water quality adjusting material containing water piping 52 into the circulation piping 11 of the circulation system 10 are provided.

  The water quality adjusting substance-containing water tank 51 is a tank that stores water quality adjusting substance-containing water, but may be configured to prepare water quality adjusting substance-containing water. For example, when an unillustrated introduction pipe for carbon dioxide, ammonia, oxygen, hydrogen, etc., a stirrer, a heater, etc. are provided in the water quality adjusting substance-containing water tank 51, water and water quality are obtained in the water quality adjusting substance-containing water tank 51. It becomes possible to prepare water-containing substance-containing water from the adjusted substance-containing substance.

(Function)
The operation of the drug injection system 1 will be described with reference to FIG.

  First, the circulation pump 12 is operated, and water is circulated in a circulation loop composed of the circulation pipe 11 and the mixing tank 13 of the circulation system 10. If necessary, the water in the circulation pipe 11 is heated to a desired temperature or kept warm using an external heater 15.

  On the other hand, the zinc-containing water tank 21 of the zinc injection system 20 contains zinc-containing water, the anticorrosive-containing water tank 31 of the anticorrosive injection system 30 contains anticorrosive-containing water, and the iron-containing water tank 41 of the iron injection system 40 contains. Stores the water-adjusting substance-containing water and the water-adjusting substance-containing water tank 51 of the water-adjusting substance-injecting system 50 respectively.

  In addition, among various contained waters such as zinc-containing water, anticorrosive agent-containing water, iron-containing water, and water-conditioning substance-containing water, contained water that does not need to be injected into the circulation system 10 may not be stored. Good.

  Next, the zinc-containing water pump 23 of the zinc injection system 20, the anticorrosive-containing water pump 33 of the anticorrosive injection system 30, the iron-containing water pump 43 of the iron injection system 40, and the water quality adjustment substance of the water quality adjustment substance injection system 50 are contained. Each of the water pumps 53 and the like is operated as necessary, and various contained water such as zinc-containing water, anticorrosive agent-containing water, iron-containing water, and water-conditioning substance-containing water is injected into the water in the circulation pipe 11 of the circulation system 10. Then, drug-containing water having a desired water quality and chemical species concentration is prepared.

  Various contained water injected into the water in the circulation pipe 11 of the circulation system 10 is sufficiently mixed in the mixing tank 13 to prepare homogeneous drug-containing water. The medicine-containing water prepared in the mixing tank 13 is returned to the circulation pipe 11 and circulated in the circulation loop.

  The chemical injection system 1 includes a zinc-containing water pipe 22 of a zinc injection system 20, an anticorrosive-containing water pipe 32 of an anticorrosive injection system 30, an iron-containing water pipe 42 of an iron injection system 40, and a water quality of a water quality adjusting substance injection system 50. All the adjustment substance-containing water pipes 52 are directly connected to the circulation pipe 11 of the circulation system 10. For this reason, various contained water such as zinc-containing water, anticorrosive agent-containing water, iron-containing water, and water-conditioning substance-containing water can be simultaneously injected into the circulation pipe 11 of the circulation system 10. In addition, you may inject | pour various containing water into the circulation piping 11 of the circulation system 10 separately.

  The drug-containing water in the circulation pipe 11 of the circulation system 10 can be collected from the sampling system 60 connected to the circulation pipe 11 of the circulation system 10 via the power plant piping 5. For this reason, when preparing the drug-containing water in the circulation system 10, the water quality and chemical species concentration of the solution sample collected from the sampling pipe 62 of the sampling system 60 are analyzed by an analysis device (not shown), and based on the analysis result. The quality and chemical species concentration of drug-containing water in the circulation system 10 can be adjusted by manually adjusting the supply amounts of various contained water.

  The water quality to be adjusted can be one or more items selected from pH, conductivity, viscosity, dissolved oxygen concentration, and dissolved hydrogen concentration.

  For example, when a carbon dioxide saturated aqueous solution or ammonia water is used as the water quality adjusting substance-containing water, the pH of the water in the circulation system 10 or the drug-containing water can be adjusted. Further, when a dissolved oxygen aqueous solution or a dissolved hydrogen aqueous solution is used as the water quality adjusting substance-containing water, the water in the circulation system 10 or the drug-containing water can be made an oxidizing environment or a reducing environment.

  The chemical-containing water adjusted to a desired water quality and chemical species concentration in the circulation system 10 is supplied to the water use system of the power plant 2 via the power plant piping 5 as necessary.

  According to the chemical injection system 1, chemicals adjusted to a desired water quality and chemical species concentration by injecting various water contents such as zinc-containing water, anticorrosive-containing water, iron-containing water, and water-conditioning substance-containing water. Since the apparatus configuration for injecting the contained water into the water use system of the power plant 2 is adopted, it is easy to adjust the water quality and chemical species concentration of the medicine-containing water, the apparatus cost of the medicine injection system 1 can be set low, and the medicine injection system The construction period of 1 can also be significantly shortened compared with the past.

  That is, conventionally, when adjusting the water quality and chemical species concentration of the water use system of the power plant 2, the zinc-containing water injection device, the anticorrosive-containing water injection device, the iron-containing water injection device, and the water quality adjusting substance-containing water injection The construction which connected various injection devices, such as a device, to the water use system of power plant 2 separately was required. For this reason, conventionally, the cost of various injection devices is high, and the construction period of the various injection devices also requires a long period of time. Furthermore, conventionally, adjustment of the water quality and chemical species concentration of the water use system of the power plant 2 is performed by the water use system itself of the power plant 2, so that adjustment is difficult.

  In contrast, the drug injection system 1 is a combination of various injection devices, and supplies the drug-containing water after the water quality and chemical species concentration are comprehensively adjusted to the water use system of the power plant 2. Therefore, it is easy to adjust the water quality and chemical species concentration of the drug-containing water, the apparatus cost of the drug injection system 1 can be set low, and the construction period of the drug injection system 1 can be greatly shortened compared to the conventional one. it can.

[Second Embodiment]
FIG. 2 is a schematic configuration diagram showing a second embodiment of the drug injection system according to the present invention.

  Compared with the drug injection system 1 shown as the first embodiment in FIG. 1, the drug injection system 1 </ b> A shown in FIG. 2 analyzes the water quality and chemical species concentration of the drug-containing water 72 collected by the sampling system 60. It differs in that it further comprises an analysis device 70 and a drug-containing water control device 80 that feedback-controls the amount of injection of various contained water such as zinc-containing water of the zinc injection system 20 into the circulation system 10. The same.

  Therefore, in the drug injection system 1A shown in FIG. 2 as the second embodiment, the same reference numerals are given to the same components as the drug injection system 1 shown as the first embodiment in FIG. Is omitted or simplified.

(Analysis equipment)
The analysis device 70 is a device that analyzes the water quality and chemical species concentration of the drug-containing water 72 collected by the sampling system 60.

  The analysis device 70 analyzes one or more water qualities selected from pH, conductivity, viscosity, dissolved oxygen concentration, and dissolved hydrogen concentration, and concentrations of chemical species such as zinc, anticorrosive, iron, and water quality adjusting substances. Possible devices are used. As the analyzer 70, for example, a redox potential measuring device such as a fluorescent X-ray analyzer, a pH meter, a reference electrode, or the like is used.

  The analysis data analyzed by the analysis device 70 can be transmitted to the medicine-containing water control device 80 via the data communication line 71.

(Drug-containing water control device)
The chemical-containing water control device 80 includes the zinc-containing water of the zinc injection system 20, the anticorrosive-containing water of the anticorrosive injection system 30, the iron-containing water of the iron injection system 40, and the water quality adjustment substance-containing water of the water quality adjustment substance injection system 50 Is a device that performs feedback control on the amount of one or more kinds of contained water selected from the above to the circulation system 10.

  The drug-containing water control device 80 includes a data storage unit 81 and a calculation control unit 82 that feedback-controls the amount of various contained water injected into the circulation pipe 11 of the circulation system 10 based on the analysis data accumulated in the data storage unit 81. And have.

  The data storage unit 81 accumulates analysis data such as water quality and chemical species concentration analyzed by the analyzer 70. Accumulation of analysis data in the data storage unit 81 is normally performed via the arithmetic control unit 82.

  The calculation control unit 82 reads out analysis data such as water quality and chemical species concentration accumulated in the data storage unit 81, and based on the read out analysis data, the drug-containing water in the circulation pipe 11 of the circulation system 10 The water quality of the zinc-injecting system 20, the anticorrosive-containing water of the anticorrosive-injecting system 30, the iron-containing water of the iron-injecting system 40, and the water quality adjusting substance-injecting system 50 so that the predetermined water quality and chemical species concentration are obtained. An appropriate injection amount into the circulation pipe 11 of the circulation system 10 of one or more kinds of contained water selected from the regulated substance-containing water is calculated.

  In addition, the calculation control unit 82 includes at least one type of water selected from zinc-containing water, anticorrosive-containing water, iron-containing water, and water quality-adjusting-substance-containing water based on the appropriate injection amounts of the various types of contained water. The amount of injection into the circulation pipe 11 of the circulation system 10 is feedback controlled.

  The arithmetic control unit 82 feedback-controls water quality including one or more items selected from, for example, pH, conductivity, viscosity, dissolved oxygen concentration, and dissolved hydrogen concentration.

  As shown in FIG. 2, the feedback control of the injection amount of various contained water by the arithmetic control unit 82 is performed using the data communication lines 85a, 85b, 85c, 85d, the zinc-containing water pump 23 of the zinc injection system 20, the anticorrosive agent. The operating conditions of the anticorrosive-containing water pump 33 of the injection system 30, the iron-containing water pump 43 of the iron injection system 40, the water quality adjustment substance-containing water pump 53 of the water quality adjustment substance injection system 50, etc. This is done by controlling the injection flow rate into the circulation pipe 11 of the circulation system 10. The data communication lines 85a, 85b, 85c, and 85d are usually wired communication lines, but may be wireless communication lines.

  Moreover, the feedback control of the injection amounts of various contained water by the arithmetic control unit 82 is performed on the circulation pipe 11 of the circulation system 10 of one or more kinds of contained water selected from zinc-containing water, anticorrosive agent-containing water, and iron-containing water. The feedback control may be performed by combining the first feedback control for feedback control of the injection amount and the second feedback control for feedback control of the injection amount of the water quality adjusting substance-containing water into the circulation pipe 11 of the circulation system 10. .

  In addition, the calculation control part 82 of the chemical | medical agent containing water control apparatus 80 circulates the circulation system 10 of various containing waters, such as zinc containing water, anticorrosive containing water, iron containing water, and water quality adjustment substance containing water as mentioned above. In addition to calculating the amount of injection into the pipe 11 and feedback control, the operating status of the circulation pump 12 and the external heater 15 of the circulation system 10 based on the flow rate, temperature, etc. of the drug-containing water in the circulation pipe 11 of the circulation system 10 May be feedback controlled.

  As shown in FIG. 2, the feedback control of the circulation pump 12 and the external heater 15 of the circulation system 10 by the arithmetic control unit 82 changes the operation status of the circulation pump 12 and the external heater 15 using the data communication lines 85e and 85f. Is done. The data communication lines 85e and 85f are usually wired communication lines, but may be wireless communication lines.

(Function)
The operation of the drug injection system 1A will be described with reference to FIG.

  The action of the medicine injection system 1A is based on the difference in the configuration further including the analysis device 70 and the medicine-containing water control device 80 as compared with the action of the medicine injection system 1 shown as the first embodiment in FIG. Since the actions are different and the other actions are the same, the explanation of the actions is simplified.

  The drug injection system 1A has the same operation as that of the drug injection system 1 shown as the first embodiment in FIG. 1, and further shows the operation based on the provision of the analysis device 70 and the drug-containing water control device 80. .

  That is, in the drug injection system 1 shown as the first embodiment in FIG. 1, a solution sample of drug-containing water in the circulation pipe 11 of the circulation system 10 collected from the sampling pipe 62 of the sampling system 60 is not shown in the drawing. After analyzing the water quality and chemical species concentration, the supply amount of various contained water such as zinc-containing water of the zinc injection system 20 was manually adjusted based on the analysis result.

  In contrast, in the drug injection system 1A shown as the second embodiment in FIG. 2, the solution sample 72 of the drug-containing water in the circulation pipe 11 of the circulation system 10 collected from the sampling pipe 62 of the sampling system 60 is analyzed. After being analyzed by the device 70, the amount of injection of various contained water such as zinc-containing water of the zinc injection system 20 into the circulation system 10 is feedback controlled by the drug-containing water control device 80 based on the obtained analysis data.

  In the analysis device 70, for example, the concentration of one or more water quality selected from pH, conductivity, viscosity, dissolved oxygen concentration, and dissolved hydrogen concentration, and the concentration of chemical species such as zinc, anticorrosive, iron, and water quality adjusting substance are analyzed. Is done.

  The analysis data analyzed by the analysis device 70 is transmitted to the drug-containing water control device 80 via the data communication line 71. Transmission of analysis data from the analysis device 70 to the drug-containing water control device 80 is normally performed automatically. The transmission of analysis data from the analysis device 70 to the drug-containing water control device 80 may be set to be transmitted only when requested from the drug-containing water control device 80 to the analysis device 70.

  The analysis data transmitted to the medicine-containing water control device 80 is accumulated in the data storage unit 81 of the medicine-containing water control device 80. The data storage unit 81 accumulates analysis data and experimental data (hereinafter referred to as “current and past analysis data”) in the water use system of the nuclear power plant or thermal power plant from the past to the present.

  In the medicine-containing water control device 80, first, the calculation control unit 82 reads the current and past analysis data accumulated in the data storage unit 81 from the data storage unit 81.

  Next, the calculation control unit 82 of the drug-containing water control device 80 determines that the drug-containing water in the circulation pipe 11 of the circulation system 10 has a predetermined water quality and chemical species concentration based on the read current and past analysis data. The zinc-containing water of the zinc injection system 20, the anti-corrosive agent-containing water of the anti-corrosive agent injection system 30, the iron-containing water of the iron injection system 40, and the water-conditioning substance-containing water of the water quality adjustment substance injection system 50 are selected. An appropriate amount of injection of one or more kinds of contained water into the circulation pipe 11 of the circulation system 10 is calculated.

  Furthermore, the calculation control part 82 of the chemical | medical agent containing water control apparatus 80 uses zinc containing water, anticorrosive containing water, iron containing water, and water quality adjustment substance containing water based on the appropriate injection amount of various containing water calculated. The amount of one or more kinds of contained water to be injected into the circulation pipe 11 of the circulation system 10 is feedback controlled.

  The command for feedback control of the injection amount of various contained water is performed by using the data communication lines 85a, 85b, 85c, 85d, the zinc-containing water pump 23 of the zinc injection system 20, and the anticorrosive-containing water pump 33 of the anticorrosive injection system 30. This is performed by transmitting a signal for changing the operation status to the iron-containing water pump 43 of the iron injection system 40, the water quality adjustment substance-containing water pump 53 of the water quality adjustment substance injection system 50, and the like. By receiving a signal from the data communication line 85a or the like, the pumps of various systems such as the zinc-containing water pump 23 of the zinc injection system 20 change the operation status. The amount of various water contained in the circulation pipe 11 of the circulation system 10 is adjusted according to changes in the operating status of the pumps of the various systems.

For example, when the chemical-containing water in the circulation pipe 11 of the circulation system 10 has a concentration of titanium oxide TiO ₂ that is an anticorrosive agent lower than a predetermined concentration and a pH value higher than a predetermined value, The arithmetic control unit 82 of the contained water control apparatus 80 increases the pump flow rate of the anticorrosive containing water pump 33 of the anticorrosive injecting system 30 via the data communication line 85b, so that the TiO ₂ in the anticorrosive containing water tank 31 is increased. Measures are taken to inject the contained anticorrosive-containing water into the circulation pipe 11 of the circulation system 10.

  As described above, in the drug injection system 1A, the water quality and chemical species concentration of the drug-containing water in the circulation pipe 11 of the circulation system 10 are analyzed by the analyzer 70, and the current and Based on the past analysis data, feedback control of the injection amount of various contained water such as zinc-containing water of the zinc injection system 20 into the circulation pipe 11 of the circulation system 10 is quickly performed. This makes it possible to quickly manage the water quality and chemical species concentration of drug-containing water.

  Further, the calculation control unit 82 of the medicine-containing water control device 80 calculates the injection amount of various kinds of contained water such as zinc-containing water into the circulation pipe 11 of the circulation system 10 and feedback control, and further circulates the circulation system 10. When feedback control is performed on the operation status of the circulation pump 12 and the external heater 15 of the circulation system 10 based on the flow rate, temperature, and the like of the drug-containing water in the pipe 11, the data communication lines 85e and 85f are used for circulation. The operating status of the pump 12 and the external heater 15 can be changed.

For example, when the drug-containing water in the circulation pipe 11 of the circulation system 10 does not have a predetermined viscosity, or when colloids such as titanium oxide TiO _{2 in the} drug-containing water are likely to aggregate. The calculation control unit 82 of the drug-containing water control device 80 changes the pump flow rate of the circulation pump 12 of the circulation system 10 via the data communication line 85e, thereby affecting the viscosity in the drug-containing water and the colloid in the drug-containing water. Measures can be taken to control agglomeration.

  In addition, when the medicine-containing water in the circulation pipe 11 of the circulation system 10 is not at a predetermined temperature, the calculation control unit 82 of the medicine-containing water control device 80 is connected to the circulation system 10 via the data communication line 85f. By changing the operating state of the external heater 15, it is possible to take measures to adjust the temperature of the drug-containing water to control the mixing state according to the purpose.

  According to the drug injection system 1A, in addition to the same operation as the drug injection system 1 shown as the first embodiment, the drug-containing water control device 80 performs central management of the drug-containing water. The drug-containing water adjusted to the chemical species concentration can be quickly prepared and injected into the water use system of the power plant 2 through the power plant pipe 5.

  In addition, since the drug-containing water can be quickly prepared and injected into the power plant 2 in response to changes in events in the power plant 2, the operation of the power plant 2 can be made safer and more reliable. Can do.

[Drug injection method]
Next, the pharmaceutical injection method according to the present invention will be described.

  The drug injection method according to the present invention is a drug injection method using the drug injection system 1 or 1A according to the present invention.

  The drug injection method according to the present invention uses the drug injection systems 1 and 1A shown in FIGS. 1 and 2 to analyze the quality and chemical species concentration of drug-containing water collected by the sampling system 60, and the analyzed water quality. And based on the analysis data of the chemical species concentration, the water quality adjustment of the zinc-containing water of the zinc injection system 20, the anticorrosive-containing water of the anticorrosive injection system 30, the iron-containing water of the iron injection system 40, and the water quality adjusting substance injection system 50 Feedback control is performed for an appropriate injection amount of the one or more kinds of contained water selected from the substance-containing water into the circulation pipe 11 of the circulation system 10.

  Since the action of the medicine injection method according to the present invention is the same as that of the medicine injection systems 1 and 1A, the description is omitted.

  Examples are shown below, but the present invention is not construed as being limited thereto.

[Example 1]
Using the chemical injection system 1 shown in FIG. 1, a titanium oxide adhesion test on the surface of stainless steel was performed.

(Preparation of specimen)
Stainless steel was treated in the presence of hydrogen to form a chromium oxide film on the surface of the stainless steel, thereby preparing a test piece.

(Preparation of drug injection system)
A test piece was placed in the circulation pipe 11 of the circulation system 10, and pure water was circulated through the circulation loop of the circulation system 10.

  The zinc-containing water tank 21 of the zinc injection system 20 was filled with an acidic (pH 3) aqueous solution containing 1% by mass of zinc oxide ZnO as zinc-containing water.

  The anticorrosive agent-containing water tank 31 of the anticorrosive agent injection system 30 was filled with weak alkaline dispersion water containing 3% by mass of titanium oxide particles as anticorrosive agent-containing water.

  The iron-containing water tank 41 of the iron injection system 40 was filled with a neutral solution containing 1% by mass of iron citrate as iron-containing water.

  The water quality adjusting substance-containing water tank 51 of the water quality adjusting substance injection system 50 was filled with a saturated dissolved hydrogen solution as water quality adjusting substance-containing water. The saturated dissolved hydrogen solution is for reducing the dissolved oxygen concentration to reduce the environment in the circulation loop of the circulation system 10 into a reducing environment.

(Operation of drug injection system)
The water quality adjusting substance-containing water pump 53 of the water quality adjusting substance injection system 50 was operated to inject reducing water quality adjusting substance-containing water into the circulation pipe 11 of the circulation system 10. The reducible water-conditioning substance-containing water makes the chemical-containing water in the circulation pipe 11 of the circulation system 10 a reducing environment.

  Simultaneously with the injection of the water quality adjusting substance-containing water, the zinc-containing water pump 23 of the zinc injection system 20 was operated to inject acidic (pH 3) zinc-containing water into the circulation pipe 11 of the circulation system 10.

  Furthermore, simultaneously with the injection of the water quality adjusting substance-containing water, the iron injection system 40 and the iron-containing water pump 43 were operated to inject the iron-containing water into the circulation pipe 11 of the circulation system 10.

  Simultaneously with the injection of the water quality adjusting substance-containing water, the anticorrosive-containing water pump 33 of the anticorrosive injection system 30 was operated to inject the weak alkaline anticorrosive-containing water into the circulation pipe 11 of the circulation system 10. When the anticorrosive-containing water was injected, the chemical-containing water in the vicinity of the test piece was adjusted to 288 ° C., and titanium oxide was adhered to the surface of the test piece. The chemical-containing water at 288 ° C. is modeled on reactor water.

  In addition, when injecting the zinc-containing water, the iron-containing water, and the anticorrosive-containing water, the water quality adjusting substance-containing water pump 53 of the water quality adjusting substance injection system 50 is appropriately operated to contain the reducing water quality adjusting substance. Water was injected into the circulation pipe 11 of the circulation system 10.

  After completion of the treatment, the test piece 90 was taken out from the circulation pipe 11.

  FIG. 3 is a schematic cross-sectional view of the test piece produced in Example 1. As shown in FIG. 3, the test piece 90 has a zinc-containing chromium oxide layer 93 and an iron-based oxide layer 94 sequentially formed on the surface of a stainless steel 92, and titanium oxide particles on the surface of the iron-based oxide layer 94. 95 was attached. The zinc-containing chromium oxide layer 93 was obtained by incorporating zinc into the chromium oxide film.

  Here, the adhesion of the titanium oxide particles 95 due to the injection of the anticorrosive-containing water in the anticorrosive injection system 30 will be described.

  FIG. 4 is a graph showing the zeta potential of titanium oxide. Here, the zeta potential indicates that the repulsive force between particles increases and the dispersibility increases as the absolute value increases. On the other hand, as the zeta potential becomes closer to zero, the repulsive force between the particles becomes smaller, which indicates that the particles tend to aggregate.

  As shown in FIG. 4, the zeta potential of titanium oxide changes as the pH value changes. Specifically, under neutral conditions, the zeta potential of the titanium oxide dispersion aqueous solution is almost zero, so that the titanium oxide particles are likely to aggregate in the titanium oxide dispersion aqueous solution. On the other hand, under alkaline conditions, the zeta potential of the titanium oxide dispersed aqueous solution becomes a negative value and the absolute value becomes large, so that the titanium oxide dispersed aqueous solution has high dispersibility of the titanium oxide particles.

  For this reason, as in this embodiment, acidic (pH 3) zinc-containing water is injected into the drug-containing water in the circulation pipe 11 of the circulation system 10, and at the same time, weak alkaline anticorrosive-containing water is added to the circulation pipe 11. When (titanium oxide particle-dispersed water) is injected, the drug-containing water in the circulation pipe 11 becomes neutral or has a pH value near it due to neutralization. For this reason, in the chemical | medical agent containing water in the circulation piping 11, a titanium oxide particle will exist under neutral conditions and it will become easy to adhere a titanium oxide particle to a test piece. Due to this mechanism, it is considered that the titanium oxide particles are well adhered to the surface of the test piece 90.

(Measurement of corrosion potential)
It is known that titanium oxide absorbs ultraviolet rays and generates an excitation current to lower the corrosion potential of the base metal. For this reason, the corrosion potential was measured using the test piece 90 in which the titanium oxide particles adhered to the surface.

  The measurement conditions were NWC water (Normal Water Chemistry) conditions of a temperature of 288 ° C., a dissolved oxygen concentration of 250 ppb, a dissolved hydrogen concentration of 10 ppb, and a hydrogen peroxide concentration of 200 ppb.

  FIG. 5 is a graph showing the measurement result of the corrosion potential of the test piece 90. As shown in FIG. 5, when the test piece was irradiated with ultraviolet rays, the corrosion potential of the test piece decreased in response to this. From FIG. 5, it was found that when titanium oxide is present on the surface, the metal material has a reduced corrosion potential and can suppress stress corrosion cracking.

  The test piece 90 has a zinc-containing chromium oxide layer 93 formed by incorporating zinc into the chromium oxide film on the surface of the stainless steel 92. For this reason, the test piece 90 can be expected to have a Co60 adhesion suppressing effect due to the synergistic effect of the zinc of the zinc-containing chromium oxide layer 93 and the titanium oxide of the titanium oxide particles 95. According to this example, it was found that when the chemical injection system 1 is used, it is possible to simultaneously exhibit the suppression of stress corrosion cracking and the suppression of adhesion of Co60.

[Example 2]
Using the chemical injection system 1 shown in FIG. 1, a titanium oxide adhesion test to the surface of carbon steel was performed.

(Preparation of specimen)
Carbon steel was used as a test piece.

(Preparation of drug injection system)
A test piece was placed in the circulation pipe 11 of the circulation system 10, and pure water was circulated through the circulation loop of the circulation system 10.

  The anticorrosive agent-containing water tank 31 of the anticorrosive agent injection system 30 was filled with weak alkaline dispersion water containing 3% by mass of titanium oxide particles as anticorrosive agent-containing water.

  The iron-containing water tank 41 of the iron injection system 40 was filled with a neutral solution containing 1% by mass of iron citrate as iron-containing water.

  A water quality adjusting substance-containing water tank 51 of the water quality adjusting substance injection system 50 was filled with a saturated dissolved hydrogen solution containing 1% by mass of ammonia as water quality adjusting substance-containing water. The saturated dissolved hydrogen solution is for bringing the environment in the circulation loop of the circulation system 10 into an alkaline environment and reducing the dissolved oxygen concentration into a reducing environment.

(Operation of drug injection system)
The water quality adjusting substance-containing water pump 53 of the water quality adjusting substance injection system 50 was operated to inject reducing and alkaline water quality adjusting substance-containing water into the circulation pipe 11 of the circulation system 10. Reducing and alkaline water-conditioning substance-containing water makes the chemical-containing water in the circulation pipe 11 of the circulation system 10 alkaline and makes it a reducing environment in which the dissolved oxygen concentration is close to zero.

  Further, simultaneously with the injection of the water quality adjusting substance-containing water, the iron-containing water pump 43 of the iron injection system 40 was operated to inject the iron-containing water into the circulation pipe 11 of the circulation system 10.

  Furthermore, simultaneously with the injection of the water quality adjusting substance-containing water, the anticorrosive agent-containing water pump 33 of the anticorrosive agent injection system 30 was operated to inject the weak alkaline anticorrosive agent-containing water into the circulation pipe 11 of the circulation system 10. When the anticorrosive-containing water was injected, the chemical-containing water in the vicinity of the test piece was adjusted to 288 ° C., and titanium oxide was adhered to the surface of the test piece. The chemical-containing water at 288 ° C. is modeled on reactor water.

  In addition, when injecting the zinc-containing water, the iron-containing water, and the anticorrosive-containing water, the water quality adjusting substance-containing water pump 53 of the water quality adjusting substance injection system 50 is appropriately operated to adjust the water quality of the reducing and alkaline water. Substance-containing water was injected into the circulation pipe 11 of the circulation system 10.

The drug-containing water in the circulation loop of the circulation system 10 is in a reducing and alkaline environment where almost no oxygen is present around the injection part due to the injection of the reducing and alkaline water-conditioning substance-containing water. When titanium oxide and iron coexist in the drug-containing water in this state, it becomes a condition that ilmenite FeTiO ₃ is easily generated. For this reason, an ilmenite FeTiO ₃ layer is formed on the surface of the test piece made of carbon steel.

  After completion of the above processing, the test piece 90A was taken out from the circulation pipe 11.

6 is a schematic cross-sectional view of a test piece produced in Example 2. FIG. As shown in FIG. 6, the test piece 90 </ b> A has a magnetite film 97 and a FeTiO ₃ film 98 sequentially formed on the surface of the carbon steel 96 and titanium oxide particles 95 attached to the surface of the FeTiO ₃ film 98. It was.

(Thinning test)
A thinning test was performed using the test piece 90A. The thinning test was performed under a degassed neutral 180 ° C. high flow rate condition.

FIG. 7 is a graph showing the thinning test result of the test piece 90A. In FIG. 7, the graph shown on the left side is the measurement result of Example 2, and the graph shown on the right side is the measurement result of the reference example. In this reference example, a magnetite film and an Fe ₃ O ₄ film are sequentially formed on the surface of carbon steel.

  From FIG. 7, it was found that the test piece 90 </ b> A to which titanium oxide was attached had a greater effect of suppressing the thinning than the test piece of the reference example to which titanium oxide was not attached.

  According to the present embodiment, it is understood that, when the drug injection system 1 is used, it is possible to express the thinning suppression effect of carbon steel used in the water use system of the power plant 2 by simultaneous injection of iron and titanium oxide. It was.

  Further, by increasing the existence time of the drug-containing water in the circulation loop, raising the temperature, and reacting titanium oxide and iron in the circulation loop, for example, on the inner surface of the circulation pipe 11 of the circulation system 10 Further, ilmenite can be generated, and a thinning suppression effect can be exhibited.

[Example 3]
Using the chemical injection system 1 shown in FIG. 1, a titanium oxide adhesion test on the surface of stainless steel was performed.

(Preparation of specimen)
Stainless steel was treated in the presence of hydrogen to form a chromium oxide film on the surface of the stainless steel, thereby preparing a test piece.

(Preparation of drug injection system)
A test piece was placed in the circulation pipe 11 of the circulation system 10, and pure water was circulated through the circulation loop of the circulation system 10.

  The zinc-containing water tank 21 of the zinc injection system 20 was filled with an acidic (pH 3) aqueous solution containing 1% by mass of zinc oxide ZnO as zinc-containing water.

  The anticorrosive agent-containing water tank 31 of the anticorrosive agent injection system 30 was filled with weak alkaline dispersion water containing 3% by mass of titanium oxide particles and having a pH exceeding 10 as anticorrosive agent-containing water.

  The iron-containing water tank 41 of the iron injection system 40 was filled with a neutral solution containing 1% by mass of iron citrate as iron-containing water.

(Operation of drug injection system)
Injection of zinc-containing water, iron-containing water, and anticorrosive-containing water into the circulation pipe 11 of the circulation system 10 was simultaneously performed.

  That is, the zinc-containing water pump 23 of the zinc injection system 20 is operated in the circulation pipe 11 of the circulation system 10 to inject acidic (pH 3) zinc-containing water, and the iron injection system 40 iron-containing water pump 43 is operated. Then, iron-containing water was injected, and the anticorrosive containing water pump 33 of the anticorrosive injection system 30 was operated to inject weak alkaline anticorrosive containing water.

  In this example, a test was performed to change the ratio of the injection flow rates of zinc-containing water, iron-containing water, and anticorrosive-containing water into the circulation pipe 11 of the circulation system 10.

  That is, first, the concentration of titanium oxide in the anticorrosive-containing water to be injected (hereinafter referred to as “titanium oxide concentration”), the concentration of zinc oxide ZnO in the zinc-containing water to be injected (hereinafter referred to as “zinc oxide concentration”), The concentration of iron citrate in the iron-containing water to be injected (hereinafter referred to as “iron citrate concentration”) is a ratio of “titanium oxide concentration: zinc oxide concentration: iron citrate concentration” “less than 1: 0.01: The ratio of the injection flow rate was set to be “1”.

  In this state, a test piece was placed in the circulation pipe 11 of the circulation system 10 to attach titanium oxide to the surface of the test piece, and the amount of titanium oxide attached was quantified.

  FIG. 8 is a graph showing the result of titanium oxide adhesion. The amount of titanium oxide attached to the test piece when the ratio of “titanium oxide concentration: zinc oxide concentration: iron citrate concentration” is “less than 1: 0.01: 1” is the A region in FIG. It almost coincided with the adhesion amount shown in the graph of the above region.

  Next, the ratio of the injection flow rate was set so that the ratio of “titanium oxide concentration: zinc oxide concentration: iron citrate concentration” was “1: 100: 1”. In this state, a test piece was placed in the circulation pipe 11 of the circulation system 10 to attach titanium oxide to the surface of the test piece, and the amount of titanium oxide attached was quantified.

  The amount of titanium oxide attached to the test piece when the ratio of “titanium oxide concentration: zinc oxide concentration: iron citrate concentration” is “1: 100: 1” is the C region in FIG. It almost agreed with the adhesion amount shown in the graph.

  Further, the test was performed by appropriately changing the ratio of “titanium oxide concentration: zinc oxide concentration: iron citrate concentration”, and the graph shown in FIG. 8 was obtained.

  FIG. 8 shows that titanium oxide does not adhere sufficiently when the drug-containing water is in an acidic region having a pH of less than 3 or an alkaline region of 10 or more. On the other hand, when the drug-containing water is in the range of pH 3 or more and less than 10 (B region in FIG. 8), it can be seen that the amount of titanium oxide attached to the test piece increases.

  Thus, when titanium oxide is injected into the circulation pipe 11 of the circulation system 10 together with other substances, it is necessary to pay sufficient attention to the pH value of the drug-containing water in the circulation pipe 11.

  In this example, the amount of titanium oxide attached was related to the pH of the drug-containing water, and the amount of titanium oxide attached was large in a weakly acidic to weakly alkaline pH region, and it was found that this is a preferable condition. However, for each chemical species such as zinc oxide and iron citrate other than titanium oxide, suitable conditions exist for the pH and temperature of the drug-containing water in order for each chemical species to exhibit its respective effects. For this reason, in order to coat the surface of the metal structure material in the water-using system of the power plant under optimum conditions, the chemical-containing water produced under conditions that allow each chemical species to fully function is used. It is preferable to distribute in a water use system.

  However, as in the prior art, when a zinc injection system, an anticorrosive injection system, an iron injection system, a water quality control substance injection system, etc. are provided independently in the water use system of the power plant, each of the zinc injection system, etc. In order to control the water quality and the injection amount in the system, it is difficult to make the chemical-containing water in the water-using system of the power plant suitable.

  On the other hand, in the drug injection system according to the present invention, in order to inject the drug-containing water prepared optimally in various conditions such as pH and the concentration of each chemical species in the drug injection system into the water use system of the power plant, It is easy to set the chemical-containing water in the water-using system of the power plant to suitable conditions.

DESCRIPTION OF SYMBOLS 1 Drug injection system 2 Power generation plant 5 Power plant piping 10 Circulation system 11 Circulation piping 12 Circulation pump 13 Mixing tank 14 Valve 15 External heater 18 Mixing tank bypass piping 19 Valve 20 Zinc injection system 21 Zinc-containing water tank 22 Zinc-containing water piping 23 Zinc-containing water pump 30 Anticorrosive injection system 31 Anticorrosion containing water tank 32 Anticorrosion containing water pipe 33 Anticorrosive containing water pump 40 Iron injection system 41 Iron containing water tank 42 Iron containing water pipe 43 Iron containing water pump 50 Water quality adjustment Material injection system 51 Water-conditioning substance-containing water tank 52 Water-conditioning substance-containing water pipe 53 Water-conditioning substance-containing water pump 60 Sampling system 62 Sampling pipe 63 Valve 70 Analyzer 71 Data communication line 72 Solution sample (drug-containing water)
80 Chemical-containing water control device 81 Data storage unit 82 Operation control unit 85a, 85b, 85c, 85d, 85e, 85f Data communication line 90, 90A Test piece 92 Stainless steel 93 Zinc-containing chromium oxide layer 94 Iron-based oxide layer 95 Oxidation Titanium particles 96 Carbon steel 97 Magnetite coating 98 FeTiO ₃ coating

Claims (10)

A drug injection system for injecting drug-containing water into a water use system of a power plant via a power plant pipe,
A circulation system having a circulation pipe through which the medicine-containing water flows, a circulation pump for circulating the medicine-containing water in the circulation pipe, and a mixing tank provided in the circulation pipe for preparing the medicine-containing water; ,
A zinc injection system for injecting zinc-containing water containing a zinc-containing substance into water from a zinc-containing water tank to a circulation pipe of the circulation system;
An anticorrosive agent injection system for injecting anticorrosive agent-containing water containing an anticorrosive agent or an anticorrosive agent-producing material into water from the anticorrosive agent-containing water tank to the circulation pipe of the circulation system;
An iron injection system for injecting iron-containing water containing iron-containing substances into water from the iron-containing water tank to the circulation pipe of the circulation system;
A water-conditioning substance injection system for injecting water-conditioning substance-containing water containing a water-conditioning substance into water from the water-conditioning substance-containing water tank to the circulation pipe of the circulation system;
A sampling system for collecting the drug-containing water in the circulation system,
The chemical injection system, wherein the power plant pipe is connected to a circulation pipe of the circulation system. The zinc injection system includes a zinc-containing water tank that contains the zinc-containing water, a zinc-containing water pipe that connects the zinc-containing water tank and a circulation pipe of the circulation system, and the zinc in the zinc-containing water pipe A zinc-containing water pump for injecting water into the circulation pipe of the circulation system,
The anticorrosive injection system includes an anticorrosive containing water tank that contains the anticorrosive containing water, an anticorrosive containing water pipe that connects the anticorrosive containing water tank and a circulation pipe of the circulation system, and the anticorrosive containing An anticorrosive-containing water pump for injecting the anticorrosive-containing water in the water pipe into the circulation pipe of the circulation system;
The iron injection system includes an iron-containing water tank that contains the iron-containing water, an iron-containing water pipe that connects the iron-containing water tank and a circulation pipe of the circulation system, and the iron in the iron-containing water pipe. An iron-containing water pump for injecting water into the circulation pipe of the circulation system,
The water quality adjusting substance injection system includes a water quality adjusting substance containing water tank that contains the water quality adjusting substance containing water, a water quality adjusting substance containing water pipe that connects the water quality adjusting substance containing water tank and a circulation pipe of the circulation system, A water quality adjusting substance-containing water pump for injecting the water quality adjusting substance-containing water in the water quality adjusting substance-containing water pipe into the circulation pipe of the circulation system,
The drug injection system according to claim 1, wherein the sampling system has a sampling pipe for collecting the drug-containing water in the circulation system.   The at least one of an external heater and an internal heater for heating the medicine-containing water in the circulation pipe is further provided in at least one of the circulation pipe or the mixing tank of the circulation system. A drug infusion system according to claim 1. An analyzer for analyzing the water quality and chemical species concentration of drug-containing water collected by the sampling system;
A data storage unit in which analysis data of the water quality and chemical species concentration analyzed by the analyzer is accumulated, and a drug content in a circulation pipe of the circulation system based on the analysis data accumulated in the data storage unit Zinc-containing water of the zinc injection system, anticorrosive-containing water of the anticorrosive injection system, iron-containing water of the iron injection system, and the water quality adjusting substance injection system so that the water has a predetermined water quality and chemical species concentration And calculating an appropriate injection amount of one or more kinds of water selected from the water quality adjusting substance-containing water into the circulation pipe of the circulation system, and the zinc-containing water and the anticorrosion based on the calculated appropriate injection amount A drug containing control unit that feedback-controls the amount of one or more types of water selected from the agent-containing water, the iron-containing water, and the water-adjusting substance-containing water into the circulation pipe of the circulation system And a control device,
The drug injection system according to claim 1, further comprising: The drug-containing water control device is:
A first feedback control for feedback-controlling an injection amount of one or more kinds of contained water selected from the zinc-containing water, the anticorrosive-containing water, and the iron-containing water into the circulation pipe of the circulation system;
A second feedback control for feedback controlling the amount of the water quality adjusting substance-containing water injected into the circulation pipe of the circulation system;
The drug injection system according to claim 3, wherein feedback control is performed in combination. The water quality feedback-controlled by the medicine-containing water control device is composed of one or more items selected from pH, conductivity, viscosity, dissolved oxygen concentration, and dissolved hydrogen concentration. Drug injection system. The drug injection system according to claim 1, wherein the zinc-containing substance in the zinc-containing water is ionic or particulate. The anticorrosive agent containing anticorrosive _water, drug infusion system of claim 1, wherein the TiO _2, FeTiO _3, a Y 2 _{O 3} and materials comprising at least one of _La 2 _{O 3.} The water use system of the power plant to which the power plant piping is connected is a water supply system, a recirculation system, a residual heat removal system, a residual heat removal system and a reactor coolant purification system of a nuclear power plant, or a thermal power plant The drug injection system according to claim 1, comprising at least one system selected from a water supply system and a condensate system. A drug injection method using a drug injection system for injecting drug-containing water into a water use system of a power plant via a power plant pipe,
The drug injection system comprises:
A circulation system having a circulation pipe through which the medicine-containing water flows, a circulation pump for circulating the medicine-containing water in the circulation pipe, and a mixing tank provided in the circulation pipe for preparing the medicine-containing water; ,
A zinc injection system for injecting zinc-containing water containing a zinc-containing substance into water into a circulation pipe of the circulation system;
An anti-corrosive agent injection system for injecting anti-corrosive agent-containing water containing an anti-corrosive agent or an anti-corrosive agent-producing raw material into water into the circulation pipe of the circulation system; and
An iron injection system for injecting iron-containing water containing iron-containing substances into water into the circulation pipe of the circulation system;
A water quality adjusting material injection system for injecting water containing a water quality adjusting material containing water quality adjusting material into the circulation pipe of the circulation system;
A sampling system for collecting the drug-containing water in the circulation system, and
The power plant piping is connected to the circulation piping of the circulation system,
Analyzing the water quality and chemical species concentration of drug-containing water collected by the sampling system, and based on the analyzed data of the analyzed water quality and chemical species concentration, the zinc-containing water of the zinc injection system, the anticorrosive agent injection system An appropriate amount of injection of one or more kinds of contained water selected from the above-mentioned anticorrosive-containing water, iron-containing water of the iron injection system, and water-controlling substance-containing water of the water-conditioning substance injection system into the circulation pipe of the circulation system A drug injection method characterized by controlling feedback.

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