CN211226440U - Chemical dosing system for deoxidant hydrazine of two-loop system of high-temperature gas cooled reactor nuclear power plant - Google Patents
Chemical dosing system for deoxidant hydrazine of two-loop system of high-temperature gas cooled reactor nuclear power plant Download PDFInfo
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- CN211226440U CN211226440U CN201921896501.7U CN201921896501U CN211226440U CN 211226440 U CN211226440 U CN 211226440U CN 201921896501 U CN201921896501 U CN 201921896501U CN 211226440 U CN211226440 U CN 211226440U
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Abstract
The utility model discloses a dosing system of a two-loop system deoxidant hydrazine of a high temperature gas cooled reactor nuclear power plant, which comprises a water supply and hydrazine adding device which is arranged on an outlet pipeline of a high pressure heater and is used for adding hydrazine, and a sampling monitoring device which is arranged at an inlet pipe of a steam generator and is used for monitoring dissolved oxygen and hydrazine content and controlling hydrazine adding amount; the utility model can reduce the flow accelerated corrosion rate of the secondary loop water supply system to the maximum extent under the condition that the chemical water treatment agent and the hydrazine dosing position of the secondary loop system of the nuclear power unit are not changed; the utility model discloses still make the change to two return circuit system's sample position, make the sample of taking more reasonable, more representative.
Description
Technical Field
The utility model relates to a high temperature gas cooled reactor nuclear power plant water chemistry operating mode technical field, concretely relates to two return circuits system oxygen-eliminating agent hydrazine's of high temperature gas cooled reactor nuclear power plant charge system.
Background
The material of the steam generator of the high-temperature gas cooled reactor nuclear power unit comprises nickel-based alloy, which has certain sensitivity to oxygen and requires that the content of dissolved oxygen in main feed water entering the steam generator is less than 3 mug/L. The deoxygenation mode of the secondary loop water supply system of the nuclear power plant is thermal deoxygenation of a deoxygenator and chemical deoxygenation by adding hydrazine so as to ensure that the main water supply entering a steam generator does not contain oxygen.
However, hydrazine belongs to a reducing agent, and after the hydrazine is added, the oxidation-reduction potential of the two-loop water supply system is reduced, and the flow accelerated corrosion rate is increased; according to the operation experience of thermal power, a unit for removing oxygen by hydrazine is added, and after the hydrazine is stopped, the iron content of a water supply system is obviously reduced, and the scaling rate of a boiler is reduced.
Flow accelerated corrosion is a significant cause of nuclear power plant secondary loop system pipe failure and steam generator iron oxide deposition. The accelerated flow corrosion not only can cause the pipelines of the middle and low water supply systems of the second loop of the nuclear power station to be thinned and even to be leaked, but also can increase the migration of corrosion products of the water supply systems to the steam generator and deposit the corrosion products in the heat exchange tube of the steam generator, thereby influencing the heat exchange efficiency and the running safety of the unit.
The method for inhibiting the flow accelerated corrosion of the secondary loop steam system of the nuclear power station comprises the following steps: (1) the use of alloy steel containing chromium in an amount greater than 0.5% by mass is effective in suppressing FAC, but requires a large amount of capital. At present, no clear regulation is made for the nuclear power units at home and abroad. (2) The cyclic chemical treatment mode is changed from a water supply ammonia adding and hydrazine treatment mode to an ammonia adding and oxygen adding combined treatment mode, but because many parts (valves and pipes) of the nuclear power station contain nickel-cobalt alloy and have certain sensitivity to dissolved oxygen, at present, no nuclear power unit adopting the oxygen adding treatment mode in the cyclic chemical treatment mode exists internationally. (3) The addition of ammonia is increased, the pH value of a water vapor system is increased, the FAC rate of a part of water supply pipelines can be reduced to a certain degree, but the ammonia content in condensed water is high, so that the period of the condensed water fine treatment system running in an H/OH mode is greatly shortened, the regeneration cost is increased, and the discharge amount of regenerated waste liquid is increased. (4) The method uses a proper alkalizer, meets the requirements of improving the pH value of a water supply system, a condensate system and a hydrophobic system, generally needs to select the alkalizer with the steam-water distribution coefficient smaller than or close to 1, and the novel alkalizer commonly used in the pressurized water reactor nuclear power station at present basically belongs to organic amines such as ethanolamine, morpholine and the like. Compared with a secondary loop system of a pressurized water reactor nuclear power plant unit, the secondary loop system of the high-temperature gas cooled reactor nuclear power plant unit has obviously higher steam parameters, and the primary steam parameters of the high-temperature gas cooled reactor nuclear power plant unit are as follows: the temperature is 570 ℃ and the pressure is 14.3 MPa; main steam parameters of a pressurized water reactor nuclear power unit: the temperature is 270 ℃, and the pressure is 5.2 MPa. The organic amine alkalizer is easy to decompose at high temperature, so the organic amine is not suitable for a secondary loop system of a high-temperature gas cooled reactor nuclear power unit.
According to the analysis, the four ways of inhibiting the flow accelerated corrosion are not the best choice ways for the built high-temperature gas cooled reactor nuclear power unit. At present, the pH value of a water supply system can be controlled to 9.5-10.0 only by increasing the ammonia adding amount so as to inhibit the flow accelerated corrosion; at the same time, hydrazine is added to the feedwater system to ensure that the primary feedwater entering the steam generator is oxygen-free water.
The purpose of the two-loop system plus hydrazine is primarily to remove dissolved oxygen from the feed water entering the steam generator. The thermal decomposition of hydrazine is affected by temperature, pH, reaction time and catalyst, and studies have shown that the temperature at which hydrazine starts to decompose is about 200 ℃ and that complete decomposition can be achieved at about 350 ℃. The hydrazine oxygen removal effect and the oxygen removal speed are related to the temperature, the hydrazine oxygen removal speed increases along with the increase of the temperature, and the research shows that 100 mu g/L of dissolved oxygen can be removed within 0.83min at 205 ℃. The flow accelerated corrosion is related to the temperature, wherein the flow accelerated corrosion rate is the largest at about 180 ℃, for a high-temperature gas cooled reactor, the most obvious area of the flow accelerated corrosion is a medium-pressure water supply system and a low-pressure water supply system, the outlet water supply temperature of a high-pressure heater exceeds 200 ℃, and the flow accelerated corrosion rate of the area is obviously reduced. It is therefore contemplated that the flow accelerated corrosion of the two-circuit system may be reduced by varying the hydrazine addition location while ensuring that the feedwater entering the steam generator is oxygen-free water.
Disclosure of Invention
According to the chemical treatment process of nuclear power unit feedwater at present home and abroad, the material and the direct current operating mode of high temperature gas cooled reactor evaporator, the utility model aims to provide a high temperature gas cooled reactor nuclear power plant two loop system oxygen-eliminating agent hydrazine's of giving water at present charge system, under the prerequisite of hydrazine medicament, through the position of adding medicine that changes hydrazine, eliminate the flow accelerated corrosion problem that the water supply pipe caused with hydrazine before the evaporimeter on the one hand, guarantee to get into steam generator's main feedwater dissolved oxygen and be zero on the one hand, the flow accelerated corrosion of greatly reduced water supply system pipeline and equipment, thereby reduce the deposit of corrosion products in steam generator heat transfer pipe and steam turbine through-flow cross section.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a medicine system of two return circuit system oxygen-eliminating agent hydrazine of high temperature gas cooled reactor nuclear power plant, is used for adding the feedwater of hydrazine and adds the hydrazine device including setting up on high pressure feed ware export pipeline, sets up the sampling monitoring device that dissolved oxygen, hydrazine content are used for controlling the hydrazine addition volume in steam generator inlet tube department monitoring.
The water supply and hydrazine adding device is a high-pressure dosing pump.
The sampling monitoring device comprises a dissolved oxygen content detector and a hydrazine content detector.
According to the dosing method of the dosing system of the deoxidant hydrazine of the secondary loop system of the high-temperature gas cooled reactor nuclear power plant, when a unit normally operates, only ammonia is added from the outlet main pipe of the condensate fine treatment device, hydrazine is added to the secondary loop system of the high-temperature gas cooled reactor nuclear power plant at the outlet of the high-pressure heater through the water supply and hydrazine adding device arranged on the outlet pipeline of the high-pressure heater, the hydrazine dosing point of the outlet main pipe of the condensate fine treatment device is cancelled, the phenomenon that the oxidation reduction potential of a water vapor system is reduced by adding hydrazine prematurely is avoided, the effect of more effectively inhibiting the flow accelerated corrosion of the secondary loop system of the high-temperature gas cooled reactor nuclear power plant is achieved, and meanwhile, the fact that main water supply entering a heat exchange pipe of; the dosing point of ammonia and hydrazine in the downcomer of the deaerator is used as a standby point when the unit is started and stopped and is abnormal; the method comprises the steps of adjusting the ammonia adding amount at a mother pipe at the outlet of a condensate fine treatment device by detecting the conductivity of feed water at the inlet of a deaerator, controlling the conductivity of the inlet of the deaerator to be within the range of 8.5 mu S/cm-26.0 mu S/cm, and ensuring the pH value of a secondary loop system of a high-temperature gas cooled reactor nuclear power plant to be 9.5-10.0; the dissolved oxygen and the hydrazine content are monitored by the sampling monitoring device arranged at the inlet pipe of the steam generator, so that the hydrazine adding amount is adjusted, the dissolved oxygen content of the feed water entering the steam generator is less than 3 mu g/L, and the hydrazine content is 50-100 mu g/L.
Compared with the prior art, the utility model has the advantages of as follows:
(1) the utility model discloses cancelled the smart female pipe hydrazine dosing point of mixed bed export, increased the hydrazine dosing point in the high pressure feed ware export, when the unit normally operates, only from the high pressure feed ware export with the hydrazine a bit. The oxidation-reduction potential of the medium-pressure and low-pressure water supply systems is improved, and the flow accelerated corrosion rate of the water supply system (the temperature is 130-200 ℃) is reduced.
(2) The newly improved hydrazine dosing point has the water supply temperature of 205 ℃, the reaction rate of hydrazine and dissolved oxygen is high, and the rapid decomposition of hydrazine is avoided.
(3) And a sampling point is arranged at the inlet of the steam generator and is used for monitoring the hydrazine dosing and the oxygen removal condition so as to ensure that the dissolved oxygen of the main feed water entering the steam generator is close to 0 mu g/L.
(4) The utility model discloses under the condition that does not change former feedwater treatment medicament, can enough reduce the flow accelerated corrosion rate of water supply system, can guarantee again that the dissolved oxygen who gets into steam generator meets the demands.
Drawings
Figure 1 is the utility model discloses a medicine system schematic diagram.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the secondary loop system of the high temperature gas cooled reactor nuclear power plant comprises a condenser 1, a condensate pump 2, a condensate fine treatment device 3, a primary low-pressure heater 4, a secondary low-pressure heater 5, a tertiary low-pressure heater 6, a deaerator 7, a water feed pump 8, a high-pressure heater 9, a steam generator 10, a high-pressure cylinder 11 and a low-pressure cylinder 12 which are connected in sequence, and the primary loop comprises a nuclear reactor 20, a helium fan 19 and a steam generator 10 which are connected in sequence. The water vapor flow of the secondary loop system of the high-temperature gas cooled reactor nuclear power plant comprises the following steps: the demineralized water is supplemented into a hot well of a condenser 1, the condensed water is conveyed to a condensed water fine treatment device 3 for treatment through a condensed water pump 2, the treated condensed water is fed to a water supply through an ammonia adding point 14, the pH value of the condensed water is increased, then the condensed water sequentially enters a first-stage low-pressure heater 4, a second-stage low-pressure heater 5, a third-stage low-pressure heater 6 and a deaerator 7, after heating and deaerating, the pH value of the water supply is unchanged, the content of dissolved oxygen is reduced, the temperature is increased to about 180 ℃, then the water supply pump 8 conveys the water supply to a high-pressure heater 9, hydrazine is added to the water supply and hydrazine device 17 arranged on an outlet pipeline of the high-pressure heater 9 for chemical deaerating, a sampling monitoring device 18 arranged at an inlet pipe of a steam generator 10 monitors the dissolved oxygen and the content of the hydrazine entering main water, after the main water enters the steam generator 10 for heat, after the steam is completely converted into steam, the steam enters the high-pressure cylinder 11 and the low-pressure cylinder 12 in sequence to do work, and the exhaust steam enters the condenser 1 again to circulate in a reciprocating mode.
As shown in figure 1, the utility model relates to a two return circuit system oxygen-eliminating agent hydrazine's of high temperature gas cooled reactor nuclear power plant charge system, including setting up the feedwater that is used for adding the hydrazine on high pressure feed ware 9 outlet pipe adds hydrazine device 17, sets up and is used for controlling the sample monitoring device 18 that the hydrazine dosage is added in steam generator 10 inlet tube department monitoring dissolved oxygen, hydrazine content.
As a preferred embodiment of the present invention, the feed water hydrazine adding device 17 is a high-pressure dosing pump.
As a preferred embodiment of the present invention, the sampling monitoring device 18 is a dissolved oxygen and hydrazine content detector.
As shown in fig. 1, the utility model discloses the medicine method of the medicine system of two return circuits system oxygen-eliminating agent hydrazine of high temperature gas cooled reactor nuclear power plant, when the unit normally operates, only add ammonia from condensate fine treatment device export female pipe 14, add hydrazine to two return circuits system of high temperature gas cooled reactor nuclear power plant at the high pressure heater exit through the feedwater that sets up on the high pressure heater 9 outlet pipe with hydrazine device 17, cancel condensate fine treatment device 3 export female pipe hydrazine dosing point 13, avoid premature addition hydrazine to reduce the redox potential of steam system, reach the effect of inhibiting the two return circuits system of high temperature gas cooled reactor nuclear power plant flow accelerated corrosion more effectively, ensure simultaneously that the main feedwater that gets into in the steam generator heat transfer pipe is oxygen-free water; the dosing point 16 of ammonia in the downcomer of the deaerator 7 and the dosing point 15 of hydrazine are used as standby when the unit is started and stopped and is abnormal; the method comprises the steps of adjusting the ammonia adding amount at a mother pipe at the outlet of a condensate fine treatment device by detecting the conductivity of feed water at the inlet of a deaerator, controlling the conductivity of the inlet of the deaerator to be within the range of 8.5 mu S/cm-26.0 mu S/cm, and ensuring the pH value of a secondary loop system of a high-temperature gas cooled reactor nuclear power plant to be 9.5-10.0; the dissolved oxygen and the hydrazine content are monitored by the sampling monitoring device arranged at the inlet pipe of the steam generator, so that the hydrazine adding amount is adjusted, the dissolved oxygen content of the feed water entering the steam generator is less than 3 mu g/L, and the hydrazine content is 50-100 mu g/L.
The utility model discloses the dosing system and the method of two loop system oxygen-eliminating agent hydrazine of high temperature gas cooled reactor nuclear power plant, do not change the feedwater and handle the medicament kind, do not change former hydrazine dosing case, only with the two loop system of high temperature gas cooled reactor nuclear power plant existing condensate water fine treatment device export female pipe add hydrazine point 13 cancellation, will add hydrazine point and change the setting into and export at high pressure heater, use high pressure dosing pump simultaneously, when the unit normally operates, only add hydrazine a bit from high pressure heater 9 outlet pipe, can be under the condition that does not influence chemical deoxidization effect, reduce the flow accelerated corrosion rate of feedwater system; meanwhile, a sampling point at the inlet of the steam generator 10 is added for monitoring the content of dissolved oxygen and hydrazine in the main feed water entering the steam generator 10, and controlling the amount of the hydrazine added to the feed water to ensure that the content of the dissolved oxygen in the main feed water entering the steam generator 10 is less than 3 mug/L.
Claims (3)
1. The utility model provides a charge system of two return circuit system oxygen-eliminating agent hydrazine of high temperature gas cooled reactor nuclear power plant which characterized in that: the device comprises a water supply and hydrazine adding device arranged on an outlet pipeline of a high-pressure heater and a sampling and monitoring device arranged at an inlet pipe of a steam generator and used for monitoring the content of dissolved oxygen and hydrazine.
2. The chemical dosing system for the oxygen scavenger hydrazine in the secondary loop system of the high temperature gas cooled reactor nuclear power plant according to claim 1, characterized in that: the water supply and hydrazine adding device is a high-pressure dosing pump.
3. The chemical dosing system for the oxygen scavenger hydrazine in the secondary loop system of the high temperature gas cooled reactor nuclear power plant according to claim 1, characterized in that: the sampling monitoring device comprises a dissolved oxygen content detector and a hydrazine content detector.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921896501.7U CN211226440U (en) | 2019-11-06 | 2019-11-06 | Chemical dosing system for deoxidant hydrazine of two-loop system of high-temperature gas cooled reactor nuclear power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921896501.7U CN211226440U (en) | 2019-11-06 | 2019-11-06 | Chemical dosing system for deoxidant hydrazine of two-loop system of high-temperature gas cooled reactor nuclear power plant |
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| CN211226440U true CN211226440U (en) | 2020-08-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110713220A (en) * | 2019-11-06 | 2020-01-21 | 西安热工研究院有限公司 | Dosing system and method for oxygen scavenger hydrazine in secondary loop system of high-temperature gas cooled reactor nuclear power plant |
| CN112430806A (en) * | 2020-11-16 | 2021-03-02 | 三门核电有限公司 | Chemical wet maintenance method for nuclear power plant auxiliary boiler during shutdown period |
-
2019
- 2019-11-06 CN CN201921896501.7U patent/CN211226440U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110713220A (en) * | 2019-11-06 | 2020-01-21 | 西安热工研究院有限公司 | Dosing system and method for oxygen scavenger hydrazine in secondary loop system of high-temperature gas cooled reactor nuclear power plant |
| CN110713220B (en) * | 2019-11-06 | 2024-02-20 | 西安热工研究院有限公司 | Dosing system and method for deoxidizer hydrazine in high-temperature gas cooled reactor nuclear power plant secondary loop system |
| CN112430806A (en) * | 2020-11-16 | 2021-03-02 | 三门核电有限公司 | Chemical wet maintenance method for nuclear power plant auxiliary boiler during shutdown period |
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