CN112984491A - Online application method and system of nuclear-grade dispersant - Google Patents
Online application method and system of nuclear-grade dispersant Download PDFInfo
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- CN112984491A CN112984491A CN202110161255.6A CN202110161255A CN112984491A CN 112984491 A CN112984491 A CN 112984491A CN 202110161255 A CN202110161255 A CN 202110161255A CN 112984491 A CN112984491 A CN 112984491A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/002—Component parts or details of steam boilers specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D1/00—Details of nuclear power plant
- G21D1/02—Arrangements of auxiliary equipment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to an online application method and system of a nuclear-grade dispersant, wherein the online application method comprises the following steps: diluting a nuclear grade dispersant with the mass fraction of 10-20% in a medicine adding tank; after the nuclear power unit reaches a full-power working condition, adding the diluted nuclear-grade dispersant into the upstream of a steam generator by using a dosing device so that the nuclear-grade dispersant enters the steam generator along with main feed water; and (3) regularly acquiring the cation conductivity, the sewage concentration and the sewage deferrization efficiency of the nuclear-grade dispersant in the sewage system, and dynamically adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device according to the cation conductivity, the sewage concentration and the sewage deferrization efficiency of the nuclear-grade dispersant in the sewage system. By implementing the technical scheme of the invention, the total removal amount of corrosion products in SG can be increased, the heat transfer performance of a steam generator is improved, the safe and stable operation of a nuclear power unit is ensured, and the economic benefit of the nuclear power station is increased.
Description
Technical Field
The invention relates to the field of nuclear power, in particular to an online application method and system of a nuclear-grade dispersant.
Background
For a nuclear power unit with 18 months refueling period and million kilowatts of power, if the average value of the Fe concentration in the main feed water of a Steam Generator (SG) is 1.5 mug/L, the amount of corrosion products (Fe) transferred to the secondary side of the SG by a secondary loop of the kernel power station in one fuel cycle period3O4Calculated) can reach 135 kg. Most of the corrosion products are deposited in various regions within the SG. The accumulation of the sediments in the SG not only reduces the heat transfer efficiency of the heat transfer pipe of the steam generator, reduces the outlet pressure of the steam generator, influences the economy of the nuclear power station, but also causes the corrosion of the heat transfer pipe to the SG water level and is unstable.
Nuclear grade dispersants may be used in the nuclear power industry to prevent agglomeration of small corrosion product particles in water, thereby hindering the deposition of corrosion products within the SG. However, the current practice is generally: the nuclear-grade dispersant is added at one time after the unit is shut down, so that the medicament is emptied after being soaked in SG for a short time, and the defects of short action time of the medicament and less total removal amount of corrosion products in SG exist.
Disclosure of Invention
The invention aims to solve the technical problems that the total amount of corrosion products in SG removed is small and shutdown is needed in the prior art, and provides an online application method and system of a nuclear grade dispersant.
The technical scheme adopted by the invention for solving the technical problems is as follows: an on-line application method for constructing a nuclear grade dispersant comprises the following steps:
step S10: diluting a nuclear grade dispersant with the mass fraction of 10-20% in a medicine adding tank;
step S20: after the nuclear power unit reaches a full-power working condition, adding the diluted nuclear-grade dispersant into the upstream of a steam generator by using a dosing device so that the nuclear-grade dispersant enters the steam generator along with main feed water;
step S30: and (3) regularly acquiring the cation conductivity, the sewage concentration and the sewage deferrization efficiency of the nuclear-grade dispersant in the sewage system, and dynamically adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device according to the cation conductivity, the sewage concentration and the sewage deferrization efficiency of the nuclear-grade dispersant in the sewage system.
Preferably, the method further comprises the following steps: and periodically monitoring the blowdown iron removal efficiency and the outlet pressure of a steam generator, and evaluating the application effect of the nuclear grade dispersant by analyzing the change trend of the blowdown iron removal efficiency and the outlet pressure.
Preferably, the diluted nuclear grade dispersant is added upstream of the steam generator, including:
adding the diluted nuclear-grade dispersant into a downcomer of a secondary loop deaerator of a nuclear power plant;
adding the diluted nuclear grade dispersant into an outlet of a seventh-grade high-pressure heater of a second loop of the nuclear power plant;
and adding the diluted nuclear-grade dispersant into an outlet of a condensate pump of a second loop of the nuclear power station.
Preferably, the step S30 includes:
calculating the mean value of the cationic conductivity in a preset time period according to the acquired cationic conductivity in the sewage system, and if the mean value is smaller than a first conductivity threshold value, adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device; if the average value is larger than or equal to a second conductivity threshold value, regulating the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device, wherein the first conductivity threshold value is smaller than or equal to the second conductivity threshold value;
if the obtained sewage concentration of the nuclear-grade dispersing agent in the sewage system reaches a concentration threshold, the diluted nuclear-grade dispersing agent is added to the upstream of the steam generator in a suspending mode until the sewage concentration of the nuclear-grade dispersing agent in the sewage system is smaller than the concentration threshold, and then the diluted nuclear-grade dispersing agent is added to the upstream of the steam generator by using the dosing device;
and if the obtained blowdown deferrization efficiency reaches a preset percentage, regulating the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device.
Preferably, the core-grade dispersant comprises polyacrylic acid, polymaleic acid and a maleic acid-acrylic acid copolymer, and the weight average molecular weight of the core-grade dispersant is 10000-200000.
Preferably, in step S10, the nuclear grade dispersant with the mass fraction of 10% to 20% is diluted into a solution with the mass fraction of 1% in the dosing tank by using power plant demineralized water.
Preferably, the dosing concentration of the nuclear grade dispersant in the steam generator is 0.1-50 mug/L, and the initial dosing concentration is 0.1 mug/L.
Preferably, the blowdown iron removal efficiency is obtained according to the following manner:
respectively acquiring main water supply flow and sewage discharge flow;
respectively obtaining the Fe concentration in the main feed water and the Fe concentration in the sewage;
calculating the iron removal efficiency of the sewage according to the following formula:
wherein epsilon is the iron removal efficiency of pollution discharge, mFWThe main water supply flow rate; m isBDThe flow rate of sewage is shown; cFWAs Fe concentration, C, in the main feed waterBDIs the Fe concentration in the sewage.
The invention also constructs an online application system of the nuclear grade dispersant, which comprises the following components:
the medicine adding tank is used for diluting the nuclear grade dispersant with the mass fraction of 10-20%;
the dosing device is used for adding the diluted nuclear-grade dispersing agent to the upstream of the steam generator after the nuclear power unit reaches a full-power working condition so that the nuclear-grade dispersing agent enters the steam generator along with main feed water;
and the adjusting device is used for periodically acquiring the cation conductivity, the sewage concentration of the nuclear-grade dispersant and the sewage deferrization efficiency in the sewage system, and dynamically adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device according to the cation conductivity, the sewage concentration of the nuclear-grade dispersant and the sewage deferrization efficiency in the sewage system.
Preferably, the method further comprises the following steps:
and the evaluation module is used for periodically monitoring the blowdown deferrization efficiency and the outlet pressure of the steam generator and evaluating the application effect of the nuclear grade dispersant by analyzing the change trends of the blowdown deferrization efficiency and the outlet pressure.
According to the technical scheme provided by the invention, when the nuclear power unit normally operates, the nuclear-grade dispersing agent is continuously added on line, and the dosing concentration can be dynamically adjusted along with the change of the cation conductivity in a sewage discharge system, the sewage discharge concentration of the nuclear-grade dispersing agent and the sewage discharge and iron removal efficiency.
Drawings
In order to illustrate the embodiments of the invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort. In the drawings:
FIG. 1 is a flow chart of a first embodiment of a method for the on-line application of a nuclear grade dispersant of the present invention;
FIG. 2 is a logical block diagram of a first embodiment of an on-line application system for a nuclear grade dispersant of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the technical problem of low total corrosion product removal amount in the prior art, the nuclear grade dispersing agent is continuously added in the whole operation period of the nuclear power unit, so that the total amount of secondary side sediments in SG can be reduced, and further, the risks of reducing the outlet pressure of a steam generator, corroding equipment and the like caused by the accumulation of corrosion products are reduced.
With regard to the nuclear grade dispersant, it is to be noted that: the nuclear-grade dispersing agent belongs to an anionic surfactant, and can be quickly adsorbed to the surfaces of corrosion product particles after being added into a secondary loop system of a nuclear power station, so that electrostatic repulsion and steric hindrance are formed among the particles, the aggregation and growth of the corrosion product particles are inhibited, and the gravity deposition rate of the corrosion product particles is slowed down. Meanwhile, the particles and the metal matrix are charged in the same way, and the particles are inhibited from being adsorbed on the metal surface. When the unit is in a high-temperature and high-pressure state, the corrosion particles are in a mature growth stage, the dispersing agent is adsorbed on the surface of the crystal nucleus, and the maturation process of the crystal nucleus can be changed. Namely, the dispersant completely maintains the oxide particles in a suspension state under the action of physical dispersion, slows down deposition and achieves the aim of improving the iron removal efficiency of pollution discharge. The dispersant itself does not react with any chemical reaction with the deposits, equipment surface materials. Compared with chemical cleaning, the dispersant technology is safer and is suitable for long-term online addition of the unit.
FIG. 1 is a flow chart of a first embodiment of the method for online application of a nuclear grade dispersant of the present invention, the method for online application of the embodiment comprising:
step S10: diluting a nuclear grade dispersant with the mass fraction of 10-20% in a medicine adding tank;
in the step, the nuclear grade dispersant contains 10-20% of high molecular compound by mass, the rest is high-purity water, the high molecular compound comprises polyacrylic acid, polymaleic acid and maleic acid-acrylic acid copolymer, and the weight average molecular weight of the nuclear grade dispersant ranges from 10000 to 200000. The nuclear grade dispersant product has good thermal stability, and the half-life of the thermal decomposition concentration (assumed according to the first-order chemical reaction kinetics) is more than 30min under the full-power operation condition of a nuclear power station.
Before dosing, the nuclear grade dispersant is diluted in a dosing tank, for example, the nuclear grade dispersant is diluted to an aqueous solution with the mass fraction of 1% by using power plant demineralized water, and the purpose of dilution is to reduce the viscosity of the drug, ensure that the nuclear grade dispersant is not adsorbed on dosing pipelines and equipment surfaces, and simultaneously ensure that the drug mixing is uniform.
Step S20: after the nuclear power unit reaches a full-power working condition, adding the diluted nuclear-grade dispersant into the upstream of a steam generator by using a dosing device so that the nuclear-grade dispersant enters the steam generator along with main feed water;
in the step, the diluted nuclear-grade dispersing agent is continuously injected to a chemical adding point (the chemical adding point is positioned at the upstream of the steam generator) by a chemical adding device so as to enter a secondary loop system of the nuclear power plant, and the nuclear-grade dispersing agent is uniformly mixed in a water supply pipeline and heating equipment and enters the secondary side of the steam generator along with main water supply.
Step S30: the method comprises the steps of periodically obtaining the cation conductivity, the sewage concentration and the sewage deferrization efficiency of a nuclear-grade dispersant in a sewage discharge system, and dynamically adjusting the dosing concentration of the nuclear-grade dispersant in a steam generator by controlling the pump water flow of a dosing device according to the cation conductivity, the sewage concentration and the sewage deferrization efficiency of the nuclear-grade dispersant in the sewage discharge system, wherein the dosing concentration of the nuclear-grade dispersant in the steam generator ranges from 0.1 mu g/L to 50 mu g/L, and the initial dosing concentration is 0.1 mu g/L.
In this step, it is first explained that the following pieces of information are known: the cation conductivity, the sewage concentration of the nuclear-grade dispersant and the sewage deferrization efficiency in the sewage system can be obtained directly from the existing chemical supervision data system of nuclear power. In addition, the concentration of the added medicament (the concentration of the added medicament of the nuclear-grade dispersant in the steam generator) is dynamically adjusted along with the change of the cation conductivity in a blow-down system of the steam generator, the blow-down concentration of the nuclear-grade dispersant and the blow-down deironing efficiency.
According to the technical scheme, when the nuclear power unit normally operates, the nuclear grade dispersing agent is continuously added on line, the dosing concentration can be dynamically adjusted along with the change of the cation conductivity in a sewage discharge system, the sewage discharge concentration of the nuclear grade dispersing agent and the sewage discharge and iron removal efficiency, and compared with the prior art that the nuclear grade dispersing agent is added in an off-line mode, the total removal amount of corrosion products in SG can be increased, the heat transfer performance of a steam generator is improved, and the safe and stable operation of the nuclear power unit is guaranteed.
In an alternative embodiment, the method for the on-line application of a nuclear grade dispersant of the present invention further comprises: and periodically monitoring the blowdown iron removal efficiency and the outlet pressure of a steam generator, and evaluating the application effect of the nuclear grade dispersant by analyzing the change trend of the blowdown iron removal efficiency and the outlet pressure. In this embodiment, the trend of the change of the iron removal efficiency of the blowdown and the outlet pressure of the steam generator can be tracked during the continuous dosing of the nuclear grade dispersant, and the aim of the trend is to serve as the basis for improving the heat transfer efficiency of the heat transfer pipe of the steam generator by long-term online application of the nuclear grade dispersant.
In an alternative embodiment, the dosing points for the aggregate dispersant may be selected at the following locations: in step S20, the diluted nuclear dispersant is added to the upstream of the steam generator, and the method may include any one of the following:
adding the diluted nuclear-grade dispersant into a downcomer of a secondary loop deaerator of a nuclear power plant;
adding the diluted nuclear grade dispersant into an outlet of a seventh-grade high-pressure heater of a second loop of the nuclear power plant;
and adding the diluted nuclear-grade dispersant into an outlet of a condensate pump of a second loop of the nuclear power station.
In an alternative embodiment, in step S30, the principle of adjusting the dosing concentration of the nuclear grade dispersant in the steam generator includes:
s31, calculating the mean value of the cation conductivity within a preset time period according to the acquired cation conductivity in the sewage system, and if the mean value is smaller than a first conductivity threshold value, adjusting the dosing concentration of the nuclear-grade dispersing agent in the steam generator by controlling the pump water flow of the dosing device; if the average value is larger than or equal to a second conductivity threshold value, regulating the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device, wherein the first conductivity threshold value is smaller than or equal to the second conductivity threshold value;
in this step, the dosing concentration of the nuclear grade dispersant can be adjusted based on the conductivity of the cations in the blowdown system, for example, in one embodiment, the dosing concentration of the nuclear grade dispersant in the steam generator can be increased when the conductivity of the cations in the blowdown system is stable at 0.5 μ S/cm for a period of time; when the cation conductivity in the blowdown system reaches 0.75 mus/cm, the dosing concentration of the nuclear grade dispersant in the steam generator may be adjusted to be reduced, for example, by half.
S32, if the obtained sewage concentration of the nuclear-grade dispersing agent in the sewage system reaches a concentration threshold, adding the diluted nuclear-grade dispersing agent to the upstream of the steam generator in a suspending mode until the sewage concentration of the nuclear-grade dispersing agent in the sewage system is smaller than the concentration threshold, and continuing to use the dosing device to add the diluted nuclear-grade dispersing agent to the upstream of the steam generator;
in this step, the dosing concentration of the nuclear grade dispersant can be adjusted according to the blowdown concentration of the nuclear grade dispersant in the blowdown system, for example, in one embodiment, due to the concentration effect of SG, when the nuclear grade dispersant concentration in the blowdown system reaches 2mg/L, dosing is suspended until the nuclear grade dispersant concentration is below this value.
And S33, if the obtained blowdown deferrization efficiency reaches a preset percentage, adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device.
In this step, the dosing concentration of the nuclear grade dispersant can be adjusted according to the iron removal efficiency of the blowdown, for example, in one embodiment, when the calculated value of the iron removal efficiency of the blowdown reaches 100%, the dosing concentration of the dispersant needs to be reduced by half.
Further, in an alternative embodiment, blowdown iron removal efficiency may be obtained according to the following:
respectively acquiring main water supply flow and sewage discharge flow;
respectively obtaining the Fe concentration in the main feed water and the Fe concentration in the sewage;
calculating the iron removal efficiency of the sewage according to the following formula:
wherein epsilon is the iron removal efficiency of pollution discharge, mFWThe main water supply flow rate; m isBDThe flow rate of sewage is shown; cFWAs Fe concentration, C, in the main feed waterBDIs the Fe concentration in the sewage.
Compared with the prior art, the online application method of the nuclear grade dispersant of the embodiment of the invention has the following advantages:
1. the high molecular compound of the nuclear-grade dispersant comprises polyacrylic acid, polymaleic acid and a maleic acid-acrylic acid copolymer, the weight average molecular weight of the nuclear-grade dispersant ranges from 10000 to 200000, and the high-purity dispersant is used, so that the introduction of few impurities can not cause corrosion of internal components of a steam generator and startup water quality control of a nuclear power plant, and the safety of the technical scheme is good;
2. polyacrylic acid in the nuclear-grade dispersant has a good effect on loose oxides (such as substances such as iron oxide, calcium oxide and the like) in the steam generator, oxide particles can be maintained to be suspended in maintenance liquid during circulating maintenance, and finally the oxides are removed through drainage, so that the scaling level of the steam generator is reduced, heat transfer is improved, and corrosion under scale is relieved, and therefore, the nuclear-grade dispersant has the advantages of low investment and obvious economic benefit;
3. the long-term online application of the nuclear grade dispersant in the nuclear power station can reduce the times of implementing chemical cleaning of the steam generator in the power station and even avoid the chemical cleaning.
FIG. 2 is a logic structure diagram of a first embodiment of the on-line application system of the nuclear grade dispersant of the present invention, which includes a chemical feeding tank 11, a chemical feeding device 12 and a regulating device 13, wherein the chemical feeding tank 11 is used for diluting the nuclear grade dispersant with a mass fraction of 10% -20%; the dosing device 12 is used for adding the diluted nuclear-grade dispersant to a dosing point (upstream of a steam generator) after the nuclear power unit reaches a full-power working condition, so that the nuclear-grade dispersant enters the steam generator along with main feed water; the adjusting device 13 is used for periodically acquiring the cation conductivity in the sewage system, the sewage concentration of the nuclear-grade dispersant and the sewage deferrization efficiency, and dynamically adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device according to the cation conductivity in the sewage system, the sewage concentration of the nuclear-grade dispersant and the sewage deferrization efficiency.
Further, the on-line application system of the nuclear grade dispersant also comprises an evaluation module, wherein the evaluation module is used for periodically monitoring the blowdown iron removal efficiency and the outlet pressure of the steam generator, and evaluating the application effect of the nuclear grade dispersant by analyzing the change trends of the blowdown iron removal efficiency and the outlet pressure.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A method for on-line application of a nuclear grade dispersant, comprising:
step S10: diluting a nuclear grade dispersant with the mass fraction of 10-20% in a medicine adding tank;
step S20: after the nuclear power unit reaches a full-power working condition, adding the diluted nuclear-grade dispersant into the upstream of a steam generator by using a dosing device so that the nuclear-grade dispersant enters the steam generator along with main feed water;
step S30: and (3) regularly acquiring the cation conductivity, the sewage concentration and the sewage deferrization efficiency of the nuclear-grade dispersant in the sewage system, and dynamically adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device according to the cation conductivity, the sewage concentration and the sewage deferrization efficiency of the nuclear-grade dispersant in the sewage system.
2. The method of on-line application of a nuclear grade dispersant according to claim 1, further comprising:
and periodically monitoring the blowdown iron removal efficiency and the outlet pressure of a steam generator, and evaluating the application effect of the nuclear grade dispersant by analyzing the change trend of the blowdown iron removal efficiency and the outlet pressure.
3. The method of claim 1, wherein adding the diluted nuclear grade dispersant upstream of the steam generator comprises:
adding the diluted nuclear-grade dispersant into a downcomer of a secondary loop deaerator of a nuclear power plant;
adding the diluted nuclear grade dispersant into an outlet of a seventh-grade high-pressure heater of a second loop of the nuclear power plant;
and adding the diluted nuclear-grade dispersant into an outlet of a condensate pump of a second loop of the nuclear power station.
4. The method for on-line application of a nuclear grade dispersant according to claim 1, wherein said step S30 comprises:
calculating the mean value of the cationic conductivity in a preset time period according to the acquired cationic conductivity in the sewage system, and if the mean value is smaller than a first conductivity threshold value, adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device; if the average value is larger than or equal to a second conductivity threshold value, regulating the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device, wherein the first conductivity threshold value is smaller than or equal to the second conductivity threshold value;
if the obtained sewage concentration of the nuclear-grade dispersing agent in the sewage system reaches a concentration threshold, the diluted nuclear-grade dispersing agent is added to the upstream of the steam generator in a suspending mode until the sewage concentration of the nuclear-grade dispersing agent in the sewage system is smaller than the concentration threshold, and then the diluted nuclear-grade dispersing agent is added to the upstream of the steam generator by using the dosing device;
and if the obtained blowdown deferrization efficiency reaches a preset percentage, regulating the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device.
5. The method of claim 1, wherein the core grade dispersant comprises polyacrylic acid, polymaleic acid, and maleic-acrylic acid copolymer, and the weight average molecular weight of the core grade dispersant is in the range of 10000-200000.
6. The method for on-line application of the nuclear grade dispersant according to claim 1, wherein in step S10, the nuclear grade dispersant with the mass fraction of 10-20% is diluted to a solution with the mass fraction of 1% in a dosing tank using power plant demineralized water.
7. The on-line application method of the nuclear grade dispersant according to claim 1, wherein the dosing concentration of the nuclear grade dispersant in the steam generator is in the range of 0.1-50 μ g/L, and the initial dosing concentration is 0.1 μ g/L.
8. The method for on-line application of nuclear grade dispersant according to claim 1, characterized in that the blowdown deferrization efficiency is obtained according to the following manner:
respectively acquiring main water supply flow and sewage discharge flow;
respectively obtaining the Fe concentration in the main feed water and the Fe concentration in the sewage;
calculating the iron removal efficiency of the sewage according to the following formula:
wherein epsilon is the iron removal efficiency of pollution discharge, mFWThe main water supply flow rate; m isBDThe flow rate of sewage is shown; cFWAs Fe concentration, C, in the main feed waterBDIs the Fe concentration in the sewage.
9. An on-line application system for a nuclear grade dispersant, comprising:
the medicine adding tank is used for diluting the nuclear grade dispersant with the mass fraction of 10-20%;
the dosing device is used for adding the diluted nuclear-grade dispersing agent to the upstream of the steam generator after the nuclear power unit reaches a full-power working condition so that the nuclear-grade dispersing agent enters the steam generator along with main feed water;
and the adjusting device is used for periodically acquiring the cation conductivity, the sewage concentration of the nuclear-grade dispersant and the sewage deferrization efficiency in the sewage system, and dynamically adjusting the dosing concentration of the nuclear-grade dispersant in the steam generator by controlling the pump water flow of the dosing device according to the cation conductivity, the sewage concentration of the nuclear-grade dispersant and the sewage deferrization efficiency in the sewage system.
10. The system for on-line application of a nuclear grade dispersant according to claim 9, further comprising:
and the evaluation module is used for periodically monitoring the blowdown deferrization efficiency and the outlet pressure of the steam generator and evaluating the application effect of the nuclear grade dispersant by analyzing the change trends of the blowdown deferrization efficiency and the outlet pressure.
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