CN102557225A - Method for adjusting pH value of secondary circuit of nuclear power plant - Google Patents
Method for adjusting pH value of secondary circuit of nuclear power plant Download PDFInfo
- Publication number
- CN102557225A CN102557225A CN2010106095825A CN201010609582A CN102557225A CN 102557225 A CN102557225 A CN 102557225A CN 2010106095825 A CN2010106095825 A CN 2010106095825A CN 201010609582 A CN201010609582 A CN 201010609582A CN 102557225 A CN102557225 A CN 102557225A
- Authority
- CN
- China
- Prior art keywords
- value
- secondary circuit
- water
- liquid
- nuclear power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides a method for adjusting the pH value of a secondary circuit of a nuclear power plant. The technical scheme is that: an ethanolamine solution is taken as a pH value adjusting agent; and the pH value of condensate is adjusted to 9.20-9.30 at the temperature of 25 DEG C before the condensate enters a subsequent secondary circuit moisture cycle. Due to the adoption of the method, the pH value of a liquid phase of a gas-liquid two-phase position is increased, a corrosion product of liquid-phase area equipment in gas and liquid phases is reduced, the corrosion state of a secondary circuit system is improved, the transfer amount of a water supply system corrosion product to the secondary side of a stream generator is reduced, the depositing probability of the corrosion product inside the stream generator is lowered, and the service life of the steam generator is prolonged; and moreover, the periodical water output of a water condensing mixed bed of a condensate precise treating device is increased, the regenerating times of the water condensing mixed bed, the using amounts of regenerated acids and alkalis and the water consumption are reduced, the workload of running personnel is relieved, and the discharge of a regenerated water liquid into the environment is reduced.
Description
Technical field
The invention belongs to the nuclear power chemical field, be specifically related to a kind of in order to slow down the novel pH regulator agent of Nuclear power plants secondary coolant circuit system corrosion condition.
Background technology
The steam generator heat-transfer pipe material of the 310MWe of Nuclear Power Qinshan Co., Ltd. unit is the Incoloy800 alloy, and its conventional island secondary coolant circuit system adopted ammonia (NH always before the novel pH regulator agent of use
3H
2O) as the pH regulator agent, the pH value of condensed water is controlled in 9.30～9.50 scopes under 25 ℃ and moves.Because the vapour-liquid partition ratio of ammonia is bigger; The ammonia of lower concentration just can not guarantee liquid-gas phase transition position steam condenses like this; The pH value that is liquid phase is alkalescence under 25 ℃, thereby causes significantly acid attack of zones such as each steam bleeding system pipeline, steam separator drain water piping, makes that the iron level of secondary circuit feedwater is higher; And these corrosion products also can further transfer in the vapour generator, cause the formation of iron dirt on steam generator heat-transfer pipe or the tube sheet.Thereby under the situation that does not change the pH regulator agent,, reduce the feedwater iron-holder in order to reduce the corrosion of each drain water piping and water feeding system; Will add more ammonia and improve the pH value of secondary circuit; But along with the raising of ammonia residual in the secondary circuit water, the polishing unit that condenses coagulates the obviously shortening of the cycle of operation that water mixes bed, and the resin regeneration frequency can improve; Cause operations staff's workload to increase considerably; For the workload that makes the operations staff remains within the suitable scope, need the processing mode of adjustment condensed water, handle changing the partial discharge processing into by original condensed water full flow.Under this operation scheme, the impurity in the condensed water comprises impurity such as corrosion product and condenser leakage, just can not be removed fully, makes condensed water water quality variation, further influence feedwater water quality.Also do not see at present the report of relevant pH value control method of the normal processing of corrosion that the water feeding system taken into account is arranged and condensed water.
Summary of the invention
The Nuclear power plants secondary circuit pH value control method that the purpose of this invention is to provide the normal processing of a kind of corrosion that takes into account water feeding system and condensed water.
To achieve these goals; Technical scheme of the present invention does; A kind of Nuclear power plants secondary circuit pH value control method, its technical scheme for ethanolamine solutions as pH value regulator, regulating condensed water, to get into the follow-up preceding pH value of secondary circuit steam circulation be 9.20～9.30 under 25 ℃.
Said ethanolamine solutions is formulated by the thanomin and the deionized water of analytical pure or the above purity of analytical pure.
The residue on evaporation of said thanomin≤0.2%, foreign matter content Fe≤0.001%, Na≤0.001%, Cu≤0.001%, SO
4≤0.001%, Cl≤0.001%.
The mass percent concentration of thanomin is 5%～6% in the said ethanolamine solutions.
Beneficial effect of the present invention is following: after the Nuclear power plants secondary coolant circuit system uses thanomin as the pH regulator agent, with NH
3H
2O does the pH regulator agent and compares, under the identical or close condition of feedwater pH, because thanomin vapour-liquid partition ratio is lower; Be generally less than 1, the concentration of thanomin in the liquid phase of stream-liquid two-phase flow position is higher, and the concentration in vapour phase is relatively low; Thereby improved the pH value of stream-liquid two-phase flow position liquid phase, hydrophobic and vapour generator (SG) sewer etc. such as separator (MSR), reduced vapour-liquid two mutually in liquid phase zone corrosion on Equipment product; Be the content of iron; Effectively suppressed the fluid accelerated corrosion at these positions, improved the corrosion condition of secondary coolant circuit system, reduced the transfer amount of water feeding system corrosion product to steam generator secondary side; Reduced the probability of corrosion product, thereby prolonged the work-ing life of vapour generator in the vapour generator inside deposition; In addition; The alkalescence of thanomin is also strong slightly than ammonia, and under the situation of keeping same feedwater pH, the thanomin content that adds in the condensed water is relatively low; Thereby improved the polishing unit that condenses and coagulated the water production in periodic mode that water mixes bed; Reduced the consumption and the water loss of the regeneration times of coagulating the water mixed-bed resin and regenerating acid, alkali, thereby alleviated operations staff's work load, reduced the discharging of regeneration waste liquid environment.
Description of drawings
Fig. 1 is that a kind of Nuclear power plants secondary circuit pH value control method is used synoptic diagram.
Among the figure, 1-adds the thanomin pipeline, and 2-adds the deionized water pipeline, 3-blade agitators, 4-formulations prepared from solutions case, 5-volume pump, the 6-polishing unit that condenses, and the 7-pH meter, 8-condenser export pipeline, 9-condensate pump, 10-rise pump with fixed attention, 11-gland heater pipeline.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in detail.
A kind of Nuclear power plants secondary circuit pH value control method of the present invention, its application is as shown in Figure 1, the condensed water of condenser export pipeline 8, its flow is about 1200m
3/ h all carries out the full flow purifying treatment through the condensate pump 9 and the polishing unit 6 that condenses; Interpolation thanomin pipeline 1 through the secondary circuit medicine system adds the thanomin (NH that about 75kg has purchased in formulations prepared from solutions case 4
2CH
2CH
2OH), its purity is analytical pure, residue on evaporation≤0.2%, foreign matter content Fe≤0.001%, Na≤0.001%, Cu≤0.001%, SO
4≤0.001%, Cl≤0.001%; Again through adding deionized water pipeline 2 adds about 1300kg to formulations prepared from solutions case 4 in deionized water, thanomin that is added and deionized water are stirred the formation ethanolamine solutions through the interior blade agitators of formulations prepared from solutions case 43; After then ethanolamine solutions boosts through volume pump 5, inject polishing unit 6 export pipelines that condense, flow through again rise pump 10 with withing fixed attention after, deliver to gland heater pipeline 11, get into follow-up secondary circuit steam and circulate; Before the polishing unit 6 export pipelines connection of condensing rises pump 10 with fixed attention, pH meter 7 is set; PH meter 7 outputs signal to the motor frequency conversion device of volume pump 5 simultaneously; According to the master mode of setting, the corresponding electric machine frequency of volume pump 5 outputs is regulated the ethanolamine solutions flow that volume pump 5 exports; PH value indication under 25 ℃ of condensed water pH meter 7 is maintained in 9.20～9.30 scopes; The pH value of vapour generator (SG) sewer is being maintained under 25 ℃ within 9.50～9.80 these suitable scopes,, reduce corrosion product at secondary coolant circuit system especially key equipment to improve the corrosion condition of Nuclear power plants secondary circuit water-steam system; The deposition on the vapour generator for example prolongs work-ing life of these equipment.
The related data of using adjusting pH value control method of the present invention and original use ammonia to regulate is following:
Can find out from last table data; The 310MWe of Nuclear Power Qinshan Co., Ltd. unit secondary coolant circuit system utilization thanomin is regulated the pH value; Compared with regulating with ammonia originally, separator (MSR) is hydrophobic to have raise much with the pH value of vapour generator (SG) sewer under 25 ℃, and secondary coolant circuit system feeds water, the fluid accelerated corrosion of hydrophobic side is inhibited; Wherein the hydrophobic iron level of separator (MSR) has reduced by 97%; The iron level of feedwater 30% before being reduced the migration amount of corrosion product to vapour generator, reduced corrosion product at the inner deposition probability of vapour generator; In addition, the water production in periodic mode that coagulates the mixed bed of water has increased by one times, and regeneration times, regeneration soda acid consumption and the regeneration water loss of coagulating the water mixed-bed resin have all reduced 46%, have alleviated operations staff's work load, have reduced the discharging of regeneration waste liquid to environment.The situation of steam generator secondary side flushing is seen during the Nuclear power plants overhaul; After the 310MWe of Nuclear Power Qinshan Co., Ltd. unit secondary coolant circuit system uses half Fuel cycle of thanomin; Did the pH regulator agent with last Fuel cycle with ammonia and compare, every steam generator secondary side flushing mud extraction quantity of slag has reduced 23%.These explain that all it is safe and effective that Nuclear power plants secondary circuit water-steam system is made the pH regulator method with thanomin, has ensured the safe operation of system device, and can prolong the work-ing life of system device.
Combine accompanying drawing that embodiments of the invention have been done detailed description above, but the present invention is not limited to the foregoing description, in the ken that those of ordinary skills possessed, can also under the prerequisite that does not break away from aim of the present invention, makes various variations.
Claims (4)
1. Nuclear power plants secondary circuit pH value control method is characterized in that with ethanolamine solutions as pH value regulator, and regulating the pH value that condensed water gets into before the follow-up secondary circuit steam circulation is 9.20～9.30 under 25 ℃.
2. a kind of Nuclear power plants secondary circuit pH value control method as claimed in claim 1 is characterized in that ethanolamine solutions is formulated by the thanomin and the deionized water of analytical pure or the above purity of analytical pure.
3. a kind of Nuclear power plants secondary circuit pH value control method as claimed in claim 1 is characterized in that residue on evaporation≤0.2% of said thanomin, foreign matter content Fe≤0.001%, Na≤0.001%, Cu≤0.001%, SO
4≤0.001%, Cl≤0.001%.
4. a kind of Nuclear power plants secondary circuit pH value control method as claimed in claim 1, the mass percent concentration that it is characterized in that thanomin in the said ethanolamine solutions is 5%～6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106095825A CN102557225A (en) | 2010-12-28 | 2010-12-28 | Method for adjusting pH value of secondary circuit of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106095825A CN102557225A (en) | 2010-12-28 | 2010-12-28 | Method for adjusting pH value of secondary circuit of nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102557225A true CN102557225A (en) | 2012-07-11 |
Family
ID=46404046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106095825A Pending CN102557225A (en) | 2010-12-28 | 2010-12-28 | Method for adjusting pH value of secondary circuit of nuclear power plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102557225A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104593780A (en) * | 2014-12-22 | 2015-05-06 | 蔡杰 | Regulator for water vapor thermodynamic cycle system and preparation method of regulator |
| CN105417668A (en) * | 2015-12-25 | 2016-03-23 | 中国核动力研究设计院 | Novel composite alkalizer and application thereof |
| CN110436599A (en) * | 2019-07-09 | 2019-11-12 | 中国船舶重工集团公司第七一九研究所 | A kind of regulator for marine small-sized heap |
| CN111334802A (en) * | 2020-04-09 | 2020-06-26 | 苏州热工研究院有限公司 | Film-forming amine corrosion inhibitor suitable for nuclear power plant secondary circuit shutdown maintenance and method for reducing secondary circuit corrosion during nuclear power plant shutdown |
| CN111362388A (en) * | 2018-12-25 | 2020-07-03 | 中核核电运行管理有限公司 | Synergistic control method for ethanolamine and ammonia in two-loop thermodynamic system of nuclear power plant |
| CN114477407A (en) * | 2022-01-06 | 2022-05-13 | 广东核电合营有限公司 | Nuclear power station secondary loop pH adjusting method and system |
-
2010
- 2010-12-28 CN CN2010106095825A patent/CN102557225A/en active Pending
Non-Patent Citations (4)
| Title |
|---|
| 《中国原子能科学研究院年报》 20051231 张孟琴等 "新型碱化剂对PWR二回路材料防腐蚀作用" 第179页 1-4 , * |
| 《中国工程科学》 20081231 陶钧等 "秦山核电厂二回路系统水化学的改进" 第91-93页 1-4 第10卷, 第1期 * |
| 张孟琴等: ""新型碱化剂对PWR二回路材料防腐蚀作用"", 《中国原子能科学研究院年报》 * |
| 陶钧等: ""秦山核电厂二回路系统水化学的改进"", 《中国工程科学》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104593780A (en) * | 2014-12-22 | 2015-05-06 | 蔡杰 | Regulator for water vapor thermodynamic cycle system and preparation method of regulator |
| CN104593780B (en) * | 2014-12-22 | 2017-09-12 | 蔡杰 | A kind of steam circulation system conditioning agent and preparation method thereof |
| CN105417668A (en) * | 2015-12-25 | 2016-03-23 | 中国核动力研究设计院 | Novel composite alkalizer and application thereof |
| CN111362388A (en) * | 2018-12-25 | 2020-07-03 | 中核核电运行管理有限公司 | Synergistic control method for ethanolamine and ammonia in two-loop thermodynamic system of nuclear power plant |
| CN110436599A (en) * | 2019-07-09 | 2019-11-12 | 中国船舶重工集团公司第七一九研究所 | A kind of regulator for marine small-sized heap |
| CN111334802A (en) * | 2020-04-09 | 2020-06-26 | 苏州热工研究院有限公司 | Film-forming amine corrosion inhibitor suitable for nuclear power plant secondary circuit shutdown maintenance and method for reducing secondary circuit corrosion during nuclear power plant shutdown |
| CN111334802B (en) * | 2020-04-09 | 2022-05-24 | 苏州热工研究院有限公司 | Film-forming amine corrosion inhibitor suitable for nuclear power plant secondary circuit shutdown maintenance and method for reducing secondary circuit corrosion during nuclear power plant shutdown |
| CN114477407A (en) * | 2022-01-06 | 2022-05-13 | 广东核电合营有限公司 | Nuclear power station secondary loop pH adjusting method and system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102557225A (en) | Method for adjusting pH value of secondary circuit of nuclear power plant | |
| US6632362B2 (en) | Vacuum retort anaerobic digestion (VRAD) system and process | |
| CN105776427B (en) | A kind of generating set condensate polishing treatment regenerative system remodeling method | |
| CN104193064B (en) | Produce the treatment process of acid washing water and neutralized wastewater in tetrabromo-bisphenol process | |
| CN104341072A (en) | Energy-saving waste-water continuous evaporating crystallizing system | |
| CN105315132A (en) | System and method used for energy utilization between ethylene glycol device dehydrating tower and refining tower | |
| CN106746129B (en) | Landfill leachate evaporation crystallization system | |
| CN113187574B (en) | Ash water true flash negative pressure wet steam turbine waste heat power generation system of coal gasification device | |
| CN105417668A (en) | Novel composite alkalizer and application thereof | |
| CN207046880U (en) | Hydrochloric acid pickling waste liquor recovery and processing system | |
| CN111517548B (en) | Desulfurization waste water evaporation concentration system | |
| CN103449591B (en) | High-concentration ammonia nitrogen wastewater treatment device | |
| CN204874418U (en) | Coal catalytic gasification system | |
| CN215403198U (en) | Anti scale deposit MVR evaporation crystallization device of high-efficient heat transfer | |
| CN215585476U (en) | Waste acid concentration device | |
| CN109437239A (en) | The low temperature position exhaust heat recovering method and device of process are absorbed in a kind of acid-making process | |
| CN210367047U (en) | Multistage flash distillation desulfurization effluent treatment plant | |
| CN204151184U (en) | A kind of energy-conservation waste water continuous evaporative crystallization system | |
| CN209696301U (en) | Adipic acid plant dust technology concentration systems | |
| CN209307138U (en) | A kind of Desulphurization for Coal-fired Power Plant Waste water concentrating sofening treatment device | |
| CN209161720U (en) | A kind of desulfurization wastewater recycling and zero discharge system | |
| CN202892954U (en) | Double-effect distillation device containing nitric acid mother liquor concentration | |
| CN106830186B (en) | Process for running condensate polishing system | |
| CN206173277U (en) | A lime set collection device for dry pulverized coal gasification system | |
| CN107522335B (en) | Comprehensive utilization system for phosphoric acid and phosphate wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120711 |