CN102445929B - Circulated water system of thermal power plant - Google Patents
Circulated water system of thermal power plant Download PDFInfo
- Publication number
- CN102445929B CN102445929B CN201110279607.4A CN201110279607A CN102445929B CN 102445929 B CN102445929 B CN 102445929B CN 201110279607 A CN201110279607 A CN 201110279607A CN 102445929 B CN102445929 B CN 102445929B
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- China
- Prior art keywords
- water
- circulated water
- power plant
- charge pump
- thermal power
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Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 230000007797 corrosion Effects 0.000 claims description 15
- 238000005260 corrosion Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000010865 sewage Substances 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 5
- 230000002401 inhibitory effect Effects 0.000 claims description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 20
- 229910000019 calcium carbonate Inorganic materials 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 description 1
- 229910000020 calcium bicarbonate Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000004457 water analysis Methods 0.000 description 1
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention relates to a circulated water system of a thermal power plant. Aiming to the defect that the circulated water system in the prior art is easy to cause system scaling and waste of water resources, the invention discloses the circulated water system of the thermal power plant. The circulated water system of the thermal power plant disclosed by the invention comprises a circulated water pool, a circulated water pump, a condenser, a cooling tower, a control device, a drain valve and a charge pump; the circulated water pool, the circulated water pump, the condenser and the cooling tower are sequentially connected via pipelines; the control device is connected with the drain valve and the charge pump; the control device comprises a DCS (Distributed Control System), a circulated water detection system, a drain valve controller and a charge pump controller; the DCS system is connected with the drain valve controller and the charge pump controller; and the circulated water detection system is composed of a temperature detection device, a total hardness detection device, a total alkalinity detection device, a pH valve detection device and a conductivity detection device and used for timely detecting circulated water parameters and inputting the circulated water parameters into the DCS. The circulated water system of the thermal power plant is mainly applied to a circulated water cooling system of the thermal power plant.
Description
Technical field
The present invention relates to Circulated water system of thermal power plant, particularly circulating water quality detects control system.
Background technology
Recirculated water is long-term used in generating plant, chemical plant and a lot of heat transmission equipment, and the water yield is huge, and financial cost is high.Recirculated cooling water is due to heat radiation evaporation, makes in water various mineral matters and ion concentration by continuous concentrated increasing, and separates out and be deposited on heating surface, make heat interchanger heat conductivility variation, reduction of heat exchange efficiency, energy consumption increases, and when serious, can cause line clogging, discharge diminish and produce underdeposit corrosion.In circulating cooling system, heat interchanger and pipeline are mostly manufactured by metal, and metal material contacts with salinity, dissolved oxygen DO etc. in water and can make metal produce galvanic corrosion.Water saving has become a lot of enterprises of a kind of puzzlement serious problems with the contradiction of fouling of heat exchanger corrosion.
Comprise with Circulating Water Corrosion effect and the closely-related parameter of fouled condition: saturation index (Is), index of stability (S) and scaling index (PSI).
1, saturation index (Is)
When dissolves carbonate reaches capacity state in water, there is following transient equilibrium relation:
Ca(HCO
3)
2＝Ca
2++2HCO
3- (1-1)
HCO
3-＝H
++CO
3- (1-2)
CaCO
3＝Ca
2++CO
3 2- (1-3)
Bright lattice rel in 1936, according to above-mentioned equilibrium relation, has proposed the concept of saturation pH value and saturation index, and to judge whether calcium carbonate can separate out incrustation scale in water, and separating out of incrustation scale controlled in the pre-service that proposition adds alkali with acid adding.
From reaction equation (1-2) with (1-3), can find out, as Xiang Shuizhong adds alkali, H
+be neutralized, the pH value of water raises, and reaction equation (1-2) carries out to right-hand, and reaction equation (1-3) carries out to left, and calcium carbonate is easily separated out.If calcium carbonate is state of saturation in water, reaction equation (1-1), (1-2), (1-3) are in equilibrium state, and calcium bicarbonate does not resolve into calcium carbonate, and calcium carbonate can not continue to dissolve yet.Now the pH value of water is called this water saturation pH value, with PHs, represents.Bright lattice rel has been derived and has been calculated the formula of PHs, and judges separating out of incrustation scale with the difference of actual pH value and PHs value.This difference is called saturation index (also claiming bright lattice rel index), with Is, represents.
When Is > 0, calcium carbonate scale can be separated out, and this water belongs to fouling type water;
When Is < 0, being originally attached to calcium carbonate scale layer on heat-transfer area can be dissolved, makes that carbon steel is exposed to be corroded in water, and this water belongs to corrosion type water;
When Is=0, calcium carbonate do not separate out, and original calcium carbonate scale layer can be not dissolved yet, and this water belongs to stable type water.
2 index of stability (S)
Nineteen forty-six thunder hereby Nasdaq index go out, when prediction water quality character, often there is false judgment in saturation index.At some in particular cases, though its saturation value be on the occasion of, aqueous corrosion is very strong.
Thunder is hereby contained on the basis of great many of experiments, has proposed to replace saturation index prediction water quality performance with 2PHs-PH.And the difference of 2PHS-PH is called to index of stability.
3 scaling indexs (PSI)
Pa Kelazi in 1979 thinks the erosion and encrustation tendency that basicity more can reaction cycle water than the practical measurement pH value of water.After a hundreds of circulation has been done to study, he thinks and changes the practical measurement pH value of water in index of stability into equilibrated ph value (PHeq) more practical in production, and equilibrated ph value and basicity can be calculated by following formula:
PHeq=1.465lg (M basicity)+4.54
The total alkalinity of recirculated water in M basicity-system (in calcium carbonate, unit is mg/L)
And propose:
PSI=2PHs-PHeq > 6 corrosion
PSI=2PHs-PHeq=6 is stable
PSI=2PHs-PHeq < 6 foulings
Above-mentioned three kinds of judge index to fouling corrosion, although be all the theory growing up on bright lattice rel basis, they take bright lattice rel index as main, index of stability and scaling index are auxiliary, but they have a very large weakness, that calculates very numerous and diverse exactly, is unfavorable for the instantaneous control that exercises supervision.
Conventional circulation generally includes water charging system, circulating water pool, water circulating pump, condenser, cooling tower, control device, blowoff valve and charge pump etc.Circulating water pool, water circulating pump, condenser, cooling tower are connected successively by pipeline, form cooling system.Water charging system is mainly the quantity of circulating water according to default, timely replenishment cycles water, the capacity of maintenance circulating water pool.Control device is connected with charge pump with blowoff valve, controls its opening and closing, to circulating water pool, adds corrosion inhibiting and descaling agent, sewage effluent.
Prior art circulation is that the determination data with supplementing water carries out approximate treatment, with 70%～80% of corrosion inhibiting and descaling agent scale inhibition ability, control, most industries is generally all comparatively traditional in circulating water treatment at present at home, all according to each analytical test result, adopt blowdown manually or timer blowdown, daily, in servicely owing to producing load, change, same cooling water quality also can change thereupon, if the variation of monitoring water quality that in the case could not be promptly and accurately, will bring fouling or etching problem to system, thereby impact is normal, produce.In other words, if discovery variation water quality early, that is petty just need to increase analysis frequency, adopt timer blowdown according to initial calculated value, to set often, blowdown is put once setting, generally can not change, and when water quality changes, can not monitor equally.In sum, the low level management of blowdown, can cause that circulation blowdown flow rate deficiency causes scaling, and the excessive meeting of blowdown causes the waste of water resource, the increase of artificial and operating cost.
Summary of the invention
Technical matters to be solved by this invention, easily causes the shortcoming of scaling and water resource waste exactly for prior art circulation, a kind of Circulated water system of thermal power plant based on computer distributed control system (DCS) is provided.
The present invention solve the technical problem, and the technical scheme of employing is that Circulated water system of thermal power plant, comprises circulating water pool, water circulating pump, condenser, cooling tower, control device, blowoff valve and charge pump, described circulating water pool, water circulating pump, condenser, cooling tower is connected successively by pipeline, and described control device is connected with charge pump with blowoff valve, controls its opening and closing, it is characterized in that, described control device comprises DCS system, recirculated water detection system, blowoff valve controller and charge pump controller, described DCS system is connected with charge pump controller with blowoff valve controller, according to input data and detection data, calculate recirculated water index of discrimination, and drive blowoff valve controller and charge pump controller according to described recirculated water index of discrimination, respectively blowoff valve and charge pump are controlled, to circulating water pool, add medicine and/or sewage effluent, described recirculated water detection system is by temperature-detecting device, total hardness pick-up unit, total alkalinity pick-up unit, pH value pick-up unit and conductivity detector form, described recirculated water detection system detects Circulating Water Parameters in real time, and input DCS system, described conductivity detector is arranged in circulating water line, Real-time Collection recirculated water conductivity data, described DCS system is set blowdown point according to recirculated water conductivity data.
Concrete, described recirculated water index of discrimination comprises saturation index, index of stability, scaling index.
Concrete, described medicine comprises corrosion inhibiting and descaling agent and/or saline and alkaline spreading agent.
Concrete, described DCS system has computer system to form.
The invention has the beneficial effects as follows, only need to gather less data (being generally 5 groups of data), just can find easily optimization control parameter and the blowdown set point of water quality, online conductivity detector energy automatic monitoring measures the variation of water quality, by DCS system, just can change in time blowdown set point, change the size (in the situation that feedwater quality is stable, conventionally not needing to make any setting and change) of blowdown flow rate.The present invention can accomplish the accurate control of Circulating water effluent, can avoid the fouling corrosion of circulation, can reasonably carry out blowdown control again, saves a large amount of water resources.At in service daily needs, do several simple conventional analysis chemical examinations (doing 1～2 time for every 12 hours) and follow the tracks of judgement as water quality, thereby minimizing manual operation, reduce operating cost, to enterprise, bring distinct economic, really reach the effect of energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is control device structural representation.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail.
Circulation of the present invention is by gathering recirculated water analysis data, and some data need to be by manually input, and some data can detect (as TDS) automatically.Control device calculates accordingly according to these data, obtains recirculated water index of discrimination, comprises saturation index Is, index of stability S, scaling index PSI.And correspondence goes out the blowdown point (reference conductivity rate parameter is set) of system the best.DCS system is sent to charge pump controller and blowoff valve controller by steering order, and according to online conductivity, the setting range of the determination data of recirculated water and blowdown optimum set point is compared, start and stop by the automatic control of sewage disposal solenoid valve of controller reach best Reasonable Pollution Discharge, thereby reach the object of water-saving and emission-reducing.
Embodiment
This routine Circulated water system of thermal power plant, as shown in Figure 1, comprises circulating water pool, water circulating pump, condenser, cooling tower, control device, blowoff valve and charge pump.Circulating water pool, water circulating pump, condenser, cooling tower are connected successively by pipeline, form circulating cooling system, and the water charging system in figure supplements due to blowdown with while evaporating lower than setting value for the water level when circulating water pool.This routine control device as shown in Figure 2, comprises DCS system, recirculated water detection system, blowoff valve controller and charge pump controller.In figure, recirculated water detection system consists of temperature-detecting device, total hardness pick-up unit, total alkalinity pick-up unit, pH value pick-up unit and conductivity detector, and these pick-up units detect circulating water temperature, total hardness, total alkalinity and pH value parameter in real time.What these supplemental characteristics had inputs to DCS system by means, and what have can gather automatically, by DCS system, is monitored in real time.Particularly conductivity detector is arranged in circulating water line, Real-time Collection recirculated water conductivity data, and DCS system is set blowdown point according to recirculated water conductivity data, and controls sewage discharge by blowoff valve controller.DCS system is also according to circulating water temperature, total hardness, total alkalinity, conductivity and pH value, computation cycles water index of discrimination, comprise saturation index, index of stability, scaling index, and the recirculated water control parameter of calculated value and setting is compared, by charge pump controller, add in time corrosion inhibiting and descaling agent and/or saline and alkaline spreading agent, recirculated water saturation index, index of stability, scaling index are controlled to setting range, can not produce fouling and corrosion, again can not be too much add medicine and sewage effluent, thereby reach the object of water-saving consumption-reduction.This routine DCS system adopts computer system to form, and has operation interface intuitively, is convenient to carry out man-machine interaction.
Comparison with regular circulation water system
Due to itself analysis data and the change of blowdown set-point not in time, just set blowdown point at last, owing to cannot carrying out accurately or in time controlling, cause following harm:
The blowdown point of take is set to 10 as example, and blowdown point fluctuates acutely up and down, has been up to 24, and at this moment rate of water make-up has reduced, but ion in water increases substantially, and equipment scaling trend increases, and the safe operation of equipment is caused to very big harm.During the fluctuation downwards of blowdown point, minimumly reached 3.5, water ions content is low, and scaling tendency reduces, but blowdown flow rate can significantly increase, and rate of water make-up also can significantly increase, and adds the production cost of large enterprises, causes economic loss.
Circulation of the present invention, adopt DCS system to control in real time, water quality is in blowdown point 10 fluctuation in a narrow margin around, upwards fluctuation is no more than 12, downward fluctuation can not found Best Point lower than 8 in fouling and economical operation, owing to and analyzing, calculate, changing blowdown set-point and effective control device, avoided better the above-mentioned two kinds of harm in conventional control, the safety in production of enterprise and economical operation have had better guarantee.
Claims (4)
1. Circulated water system of thermal power plant, comprises circulating water pool, water circulating pump, condenser, cooling tower, control device, blowoff valve and charge pump, described circulating water pool, water circulating pump, condenser, cooling tower is connected successively by pipeline, and described control device is connected with charge pump with blowoff valve, controls its opening and closing, it is characterized in that, described control device comprises DCS system, recirculated water detection system, blowoff valve controller and charge pump controller, described DCS system is connected with charge pump controller with blowoff valve controller, according to input data and detection data, calculate recirculated water index of discrimination, and drive blowoff valve controller and charge pump controller according to described recirculated water index of discrimination, respectively blowoff valve and charge pump are controlled, to circulating water pool, add medicine and/or sewage effluent, described recirculated water detection system is by temperature-detecting device, total hardness pick-up unit, total alkalinity pick-up unit, pH value pick-up unit and conductivity detector form, described recirculated water detection system detects Circulating Water Parameters in real time, and input DCS system, described conductivity detector is arranged in circulating water line, Real-time Collection recirculated water conductivity data, described DCS system is set blowdown point according to recirculated water conductivity data.
2. Circulated water system of thermal power plant according to claim 1, is characterized in that, described recirculated water index of discrimination comprises saturation index, index of stability, scaling index.
3. Circulated water system of thermal power plant according to claim 1, is characterized in that, described medicine comprises corrosion inhibiting and descaling agent and/or saline and alkaline spreading agent.
4. Circulated water system of thermal power plant according to claim 1, is characterized in that, described DCS system consists of computer system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110279607.4A CN102445929B (en) | 2011-09-20 | 2011-09-20 | Circulated water system of thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110279607.4A CN102445929B (en) | 2011-09-20 | 2011-09-20 | Circulated water system of thermal power plant |
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| Publication Number | Publication Date |
|---|---|
| CN102445929A CN102445929A (en) | 2012-05-09 |
| CN102445929B true CN102445929B (en) | 2014-07-16 |
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| CN201110279607.4A Expired - Fee Related CN102445929B (en) | 2011-09-20 | 2011-09-20 | Circulated water system of thermal power plant |
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|---|---|---|---|---|
| CN103529801B (en) * | 2013-10-22 | 2016-02-24 | 国家电网公司 | Municipal middle water is back to the cyclic control system of circulating cooling water of power plant |
| CN104317282A (en) * | 2014-11-21 | 2015-01-28 | 张伟 | Industrial cold end circulating water optimization and energy saving control system |
| CN105717266B (en) * | 2014-12-04 | 2018-08-14 | 国家电网公司 | A kind of direct-current transmission converter valve quality of cooling water on-line monitoring system and its monitoring method |
| CN104656692B (en) * | 2015-02-10 | 2017-05-10 | 西安西热水务环保有限公司 | System and method for controlling concentration ratio of circulating water using decarbonized and demineralized water as supplementing water |
| CN105954482A (en) * | 2016-04-26 | 2016-09-21 | 国家电网公司 | Method for detecting water quality of external cooling water system of converter station |
| CN106774020A (en) * | 2017-02-16 | 2017-05-31 | 神华集团有限责任公司 | For the aeration water quality regulating device of spike cooling system |
| CN108585225A (en) * | 2018-07-13 | 2018-09-28 | 山东海能环境技术有限公司 | A kind of circulating water quality stabilizing control system and control method |
| CN108585226A (en) * | 2018-07-13 | 2018-09-28 | 山东海能环境技术有限公司 | A kind of system and method for the circulating water quality stability contorting based on remote control |
| CN109974935B (en) * | 2019-04-11 | 2023-09-19 | 华能国际电力股份有限公司 | Condenser leakage rapid diagnosis system and method based on optical principle |
| CN110153390B (en) * | 2019-06-10 | 2021-11-19 | 成渝钒钛科技有限公司 | Steel index control method for deepening steel passing amount of steel-making crystallizer |
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| CN1514248A (en) * | 2003-03-20 | 2004-07-21 | 北京科技大学 | Circulating cooling water quality monitoring system and equipment |
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-
2011
- 2011-09-20 CN CN201110279607.4A patent/CN102445929B/en not_active Expired - Fee Related
Patent Citations (4)
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|---|---|---|---|---|
| CN1514248A (en) * | 2003-03-20 | 2004-07-21 | 北京科技大学 | Circulating cooling water quality monitoring system and equipment |
| CN2916436Y (en) * | 2006-06-12 | 2007-06-27 | 吴正浩 | Hot water circulation system for full-automatic ground-heating electric water heating furnace |
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| CN102445929A (en) | 2012-05-09 |
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Address after: The people of Wuhou District road Chengdu city Sichuan province 610041 four Branch Road No. 3 National 863 software incubator base in Sichuan on the third floor Applicant after: Chengdu Hot New Energy Technology Co., Ltd. Address before: High tech Zone Branch Road Chengdu 610041 Sichuan province No. 3 National 863 software incubator base in Sichuan 3 floor Applicant before: Chengdu Stone New Energy Technology Co., Ltd. |
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Address after: The people of Wuhou District road Chengdu city Sichuan province 610041 four Branch Road No. 3 Applicant after: Chengdu Hot New Energy Technology Co., Ltd. Address before: The people of Wuhou District road Chengdu city Sichuan province 610041 four Branch Road No. 3 National 863 software incubator base in Sichuan on the third floor Applicant before: Chengdu Hot New Energy Technology Co., Ltd. |
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