CN102681452A - Circulating water system control method - Google Patents
Circulating water system control method Download PDFInfo
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- CN102681452A CN102681452A CN2012101553915A CN201210155391A CN102681452A CN 102681452 A CN102681452 A CN 102681452A CN 2012101553915 A CN2012101553915 A CN 2012101553915A CN 201210155391 A CN201210155391 A CN 201210155391A CN 102681452 A CN102681452 A CN 102681452A
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Abstract
The invention relates to a circulating water system control method, which comprises the steps of (1) acquiring a limit concentration ratio in circulating water through a scale inhibition test; (2) determining a limit value of chloride ion concentration ratio, a hardness limit value and an alkalinity limit value of the circulating water at the limit concentration ratio; (3) creating a safe chloride ion concentration ratio for the running control of the circulating water, and determining a control index of the alkalinity and the hardness; (4) detecting the alkalinity and the hardness of the circulating water; (5) observing whether the detection value of the alkalinity and the detection value of the hardness of the circulating water meet the control indexes, and processing the circulating water and re-detecting the circulating water after being adjusted if one or two items of the detection value of the alkalinity or the detection value of the hardness cannot meet the control index; and (6) ending the detection if both the detection value of the alkalinity and the detection value of the hardness meet the control index. The method for detecting and controlling the alkalinity and hardness in the circulating water is used for substituting the method for controlling the concentration ratio so as to prevent the scaling and corrosion problems of the circulating water, so that not only is the running of the circulating water convenient to control, but also the water resource is maximally utilized.
Description
Technical field
The invention belongs to recirculated water management technical field, relate to a kind of circulation control method, be specifically related to the scale inhibition of industrial circulating cooling water system and the control method that inhibition is handled.
Background technology
Water is the necessary condition that all biologies are depended on for existence, and it is imperative to economize on water.Circulation is the most important cooling system of industrial enterprise, and can circulation normally be moved, and directly has influence on stable operation, production safety and the economic benefit of enterprise.The water consumption of doing ash disposal heat-engine plant circulating water system accounts for more than 70% of power plant's total water amount, the continuous strictness of and national environmental protection policy in short supply day by day along with water resource, and the monitoring of recirculated water, control seem particularly important.Because sewage, waste water, middle water etc. constantly are back to use circulation, make circulating water quality and controlled condition thereof increasingly sophisticated, have higher requirement for fragile recirculated water supervision.
Concentration rate characterizes water by the degree that concentrates, and concentration rate is big more, explains that water is high more by the concentration that concentrates.Concentration rate is the important indicator of the operational monitoring of heat-engine plant circulating water system, control and management.Under the stable situation in water source, rationally control fouling and corrosion that concentration rate just can effectively be prevented locking system.Muriatic solubleness is big, chlorion relatively stable (do not generate deposition with other ionic reactions usually or separate out) in the water, is easy to detect, and thermal power plant recently representes (usefulness usually with the chlorion quality in recirculated water and the supplementing water for a long time
kExpression,
k=Cl
- Recirculated water/ Cl
- Supplementing water) concentration rate of recirculated water.
Because the water source lacks day by day, energy-saving and emission-reduction pressure strengthens gradually, and many power plant have to adopt sewage, middle water and the waste water water source as recirculated water.The complicated component of these water, flow and water quality are all in time, changes of seasons, particularly chlorion and various ion ratio differ greatly, and judge that only according to detecting in the recirculated water chloride ion content concentration rate is not accurate enough.In addition; The bacterium algae grows to system and makes troubles; The heat-engine plant circulating water system must regularly add a certain amount of germifuge and carry out the sterilization algae removal processing; The efficient oxidation type germifuge commonly used is that germifuge is main with chlorine, and chlorine is that germifuge (particularly sodium hypochlorite) is brought a large amount of chlorions into to circulation, influences the mensuration of chlorion and the calculating of concentration rate.Therefore, the method for independent employing monitoring chlorion concentration rate is the safe and stable operation of Control Circulation water system effectively, and expectation has a kind of rational circulation control method.
Summary of the invention
The present invention provides a kind of circulation control method; Basicity and hardness through in detection and the Control Circulation water prevent recirculated water fouling and corrosion, have both guaranteed the safety and steady operation of system, maximally utilise water resource again; Save production cost, increase economic benefit.
Circulation control method of the present invention, process is following:
⑴ draw the concentration rate K of chlorion in the recirculated water through antisludging test
ClConcentration rate K with hardness
YD
⑵ with reference to GB 50050-2007 " Code for design of industrial recirculating cooling water treatment ", according to △ A=K
Cl-K
YD≤0.2 principle confirms that the chlorion concentration rate ultimate value K of fouling appears in recirculated water
The limit
⑶ formulate the chlorion cycles of concentration of recirculated water operation control, and confirm to detect the controlling index of basicity and hardness.
⑷ detect the basicity and the hardness of recirculated water.
⑸ observe whether coincidence control index of recirculated water basicity detected value and hardness detected value, if basicity detected value or hardness detected value wherein one or two do not meet controlling index, detect again after recirculated water is handled.
⑹ if the equal coincidence control index of basicity detected value and hardness detected value then detects and finishes.
Recirculated water hardness detects is undertaken by GB/T 6909-2008 " mensuration of boiler feed water and chilled water analytical approach hardness ", and recirculated water basicity detects is undertaken by GB/T 15451-2006 " mensuration of industrial circulating cooling water total alkali and phenolphthalein alkalinity ".Antisludging test carries out with reference to the chemical industry standard of HG/T2160-2008 " chilled water dynamic analog test method ".The recirculated water chlorion detects and is undertaken by GB/T 15453-2008 " mensuration of chlorion in industrial circulating cooling water and the boiler feed water " in the antisludging test; To circulating water treatment in recirculated water, to add antisludging agent or/and add acid.
The principal ingredient that constitutes the recirculated water fouling is hardness (being calcium, magnesium ion) and basicity (being carbonate) in the recirculated water, as long as these two indexs of control produce with regard to the may command fouling.According to this principle, no matter how the water quality of supplementing water changes, no matter also chlorion is to be greatly little, as long as the hardness, the basicity that detect are no more than controlling index, equipment can safe operation, and does not worry that concentration rate exceeds standard or the problem of fouling takes place.
The method of basicity and hardness replaces the control cycles of concentration to prevent recirculated water fouling and etching problem in the present invention's employing detection Control Circulation water; Both made things convenient for the operation control of recirculated water; Can maximally utilise water resource again, economize on the use of funds, guarantee the safety and steady operation of circulation.
Use the circulation control method of the present invention concentration rate of Control Circulation water rationally, the conserve water resource reduces the pollution of recirculated water blowdown to environment, reduces the dose that adds of antisludging agent, is convenient to on-the-spot detection and control, guarantees the safety and economic operation of unit.In water, that black water is back to circulation embodiment of the present invention effect is particularly evident, nervous and realize that the municipal middle water reuse plays positive facilitation to solving process water, has received good economic benefit and social benefit.Circulation control method of the present invention has the detection of being easy to, is convenient to control, adaptable advantage; Be applicable to the circulating water treatment technology that adds acid, adds the antisludging agent treatment process and add antisludging agent separately, also be applicable to surface water, underground water or middle water to replenishing the circulation at water source.
Description of drawings
Fig. 1 is the schematic flow sheet of circulation control method of the present invention;
Fig. 2 is an antisludging test device schematic flow sheet
Wherein:
1-cooling tower, 2-halometer, 3-flowmeter, (4,5)-hanging tube, 6-water circulating pump, 7-fluid infusion groove, 8-fluid infusion pump, 9-liquid bath.
It specifically is embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Circulation control method of the present invention, as shown in Figure 1, detection and control procedure are following:
⑴ draw the concentration rate K of chlorion in the recirculated water through antisludging test
ClConcentration rate K with hardness
YDChlorion detects and is undertaken by GB/T 15453-2008 " mensuration of chlorion in industrial circulating cooling water and the boiler feed water " in the recirculated water; Recirculated water hardness detects is undertaken by GB/T 6909-2008 " mensuration of boiler feed water and chilled water analytical approach hardness ".Test unit is as shown in Figure 2, and test is carried out with reference to the chemical industry standard of HG/T2160-2008 " chilled water dynamic analog test method ".At first in cooling tower, 1 inject the 15L test water, add the water quality stabilizer of respective amount, stir.The water quality stabilizer that adds 10L test water and corresponding proportion again in the fluid infusion groove 7.
Not blowdown in the test concentration process, the moisturizing while concentrating, when reaching the actual motion concentration rate (when fouling occurring), it is certain to keep concentration rate through the blowdown mode.In the test run, the Cl in the results of regular determination system
-, hardness, basicity.Continue to concentrate till the concentration rate that reaches capacity.
⑵ with reference to GB 50050-2007 " Code for design of industrial recirculating cooling water treatment ", according to △ A=K
Cl-K
YD≤0.2 principle confirms that the chlorion concentration rate ultimate value K of fouling appears in recirculated water
The limitIn the process of the test, check and analysis regularly when △ A=2, are test endpoint, and record hardness, basicity at this moment is respectively limit hardness and limit basicity.
⑶ with the ultimate value K of chlorion concentration rate among the step ⑵
The limitMultiply by 0.9 safety coefficient and obtain the chlorion cycles of concentration that recirculated water detects.Limit hardness and limit basicity multiply by the controlling index that 0.9 safety coefficient obtains recirculated water basicity and hardness.
⑷ detect circulation water hardness and basicity; Recirculated water hardness detects is undertaken by GB/T 6909-2008 " mensuration of boiler feed water and chilled water analytical approach hardness ", and recirculated water basicity detects is undertaken by GB 15451-2006 " mensuration of industrial circulating cooling water total alkali and phenolphthalein alkalinity ".
⑸ observe whether coincidence control index of recirculated water basicity detected value and hardness detected value, if basicity detected value and hardness detected value wherein one or two do not meet controlling index, detect again after recirculated water is handled, adjusted.The method of handling comprises and in recirculated water, adds antisludging agent or/and add acid, looks the water quality detection result and decides.
⑹ if the equal coincidence control index of hardness detected value and basicity detected value detects and finishes.
Embodiment 1
Because the needs of water saving, municipal middle water is replaced by by surface water in certain electric power plant circulating water system water source, because of in water water quality to change fluctuation in time bigger, cause determination of chloride ion unstable, it is difficult to calculate concentration rate.Utilize circulation control method of the present invention to carry out recirculated water and detect and control, under the condition that adds anti-incrustation corrosion inhibitor 6mg/L, ⑴ carries out antisludging test set by step, draws cycles of concentration.Carry out step ⑵, press △ A=0.18, draw ultimate value, basicity ultimate value and the hardness limit value of cycles of concentration, the result sees table 1.Ultimate value with cycles of concentration, basicity and hardness is multiplied by 0.9 safety coefficient, draws the controlling index of basicity and hardness, sees table 2.Operation is over 3 years, and the overhaul check circulation is not found the generation of hard scale except that a small amount of foundry loam occurring, obtained good effect.List this method in operating standard at present and carry out use.
Table 1 cycles of concentration, basicity and hardness limit value
| K The limit | 90%K The limit | Basicity The limit（mmol/L） | Hardness The limit（mmol/L） | △A |
| 3.74 | 3.37 | 6.5 | 46.2 | 0.18 |
Table 2 recirculated water operation controlling index
Embodiment 2
As supplementing water, hypochlorous sodium is carried out sterilization processing as germifuge with mine water in certain power plant.When it adopted concentration rate to control, the fluctuation that chlorion detects numerical value was bigger, was difficult to control.Adopt ring water system control method of the present invention to carry out recirculated water and detect and control, draw ultimate value, basicity ultimate value and the hardness limit value of cycles of concentration, see table 3.Ultimate value with cycles of concentration, basicity and hardness is multiplied by 0.9 safety coefficient, draws the controlling index of basicity and hardness, sees table 4.Operation checks that circulation is clean one year over, no hard scale deposition, and scale inhibition effect is good, and control method is clear and definite, is easy to detect and carry out, and receives the favorable comment of moving the control personnel.
Table 3 cycles of concentration, basicity and hardness limit value
| K The limit | 90%K The limit | Basicity The limit（mmol/L） | Hardness The limit（mmol/L） | △A |
| 3.00 | 2.70 | 8.9 | 26.7 | 0.19 |
Table 4 recirculated water operation controlling index
Use behind the present invention the concentration rate of Control Circulation water rationally, the conserve water resource reduces the pollution of recirculated water sewer to environment, reduces the dose that adds of antisludging agent, is convenient to the detection at scene and the safety and economic operation of control and assurance unit, reduces production costs.With 2 * 300MW fired power generating unit is example, and the quantity of circulating water of its 2 units is about 72152m
3/ h, the cooling tower vaporization loss water yield is about 1039m
3/ h; Use method Control Circulation water of the present invention, can be every year and practice thrift ten thousand tons (2.5-3.0 doubly) surplus the fresh water 80, practice thrift about 1,000,000 yuan of fouling, the corrosion prevention risk cost brought thus; The while rational utilization of water resources; Reduce wastewater disposition, the protection environment has been realized the synchronous raising of economic benefit and social benefit.
Claims (4)
1. circulation control method, process is following:
⑴ draw the concentration rate K of chlorion in the recirculated water through antisludging test
ClConcentration rate K with hardness
YD
⑵ with reference to GB 50050-2007 " Code for design of industrial recirculating cooling water treatment ", according to △ A=K
Cl-K
YD≤0.2 principle confirms that the chlorion concentration rate ultimate value K of fouling appears in recirculated water
The limit
Formulate recirculated water operation control the chlorion cycles of concentration, and confirm to detect the controlling index of basicity and hardness;
⑷ detect the basicity and the hardness of recirculated water;
⑸ observe whether coincidence control index of recirculated water basicity detected value and hardness detected value, if basicity detected value or hardness detected value wherein one or two do not meet controlling index, detect again after recirculated water is handled, adjusted;
⑹ if the equal coincidence control index of basicity detected value and detected value hardness then detects and finishes.
2. circulation control method according to claim 1 is characterized in that: said recirculated water hardness detects is undertaken by GB/T 6909-2008 " mensuration of boiler feed water and chilled water analytical approach hardness "; Said recirculated water basicity detects is undertaken by GB/T 15451-2006 " mensuration of industrial circulating cooling water total alkali and phenolphthalein alkalinity ".
3. circulation control method according to claim 1 is characterized in that: said antisludging test carries out with reference to the chemical industry standard of HG/T2160-2008 " chilled water dynamic analog test method "; The recirculated water chlorion detects and is undertaken by GB/T 15453-2008 " mensuration of chlorion in industrial circulating cooling water and the boiler feed water " in the antisludging test.
4. circulation control method according to claim 1 is characterized in that: said to circulating water treatment in recirculated water, to add antisludging agent or/and add acid.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105461084A (en) * | 2015-12-10 | 2016-04-06 | 河北省电力建设调整试验所 | Scale inhibition control method adopted in circulating water operation process |
| CN107089730A (en) * | 2016-12-30 | 2017-08-25 | 湖北新洋丰肥业股份有限公司 | A kind of good antiscale property method for circulation |
| CN107358355A (en) * | 2017-07-12 | 2017-11-17 | 南京钢铁股份有限公司 | A kind of quick and precisely evaluation method of industrial circulating cooling water water stabilization effect |
| CN109521813A (en) * | 2018-11-13 | 2019-03-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of system and method for thermal power plant recirculated water concentration rate stability contorting |
| CN111018141A (en) * | 2019-12-18 | 2020-04-17 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Method for calculating universal limit concentration multiple of circulating cooling water and application |
| CN115140899A (en) * | 2022-07-15 | 2022-10-04 | 浙江红狮环保股份有限公司 | Treatment technology of high organic matter and high salt wastewater |
| CN116657128A (en) * | 2023-07-31 | 2023-08-29 | 杭州尚善若水环保科技有限公司 | Phosphorus-free prefilming combined reagent and circulating water phosphorus-free combined prefilming treatment method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105461084A (en) * | 2015-12-10 | 2016-04-06 | 河北省电力建设调整试验所 | Scale inhibition control method adopted in circulating water operation process |
| CN107089730A (en) * | 2016-12-30 | 2017-08-25 | 湖北新洋丰肥业股份有限公司 | A kind of good antiscale property method for circulation |
| CN107358355A (en) * | 2017-07-12 | 2017-11-17 | 南京钢铁股份有限公司 | A kind of quick and precisely evaluation method of industrial circulating cooling water water stabilization effect |
| CN109521813A (en) * | 2018-11-13 | 2019-03-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of system and method for thermal power plant recirculated water concentration rate stability contorting |
| CN109521813B (en) * | 2018-11-13 | 2023-08-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | System and method for stably controlling concentration ratio of circulating water of thermal power plant |
| CN111018141A (en) * | 2019-12-18 | 2020-04-17 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Method for calculating universal limit concentration multiple of circulating cooling water and application |
| CN115140899A (en) * | 2022-07-15 | 2022-10-04 | 浙江红狮环保股份有限公司 | Treatment technology of high organic matter and high salt wastewater |
| CN115140899B (en) * | 2022-07-15 | 2024-02-23 | 浙江红狮环保股份有限公司 | Treatment method of high-organic matter and high-salt wastewater |
| CN116657128A (en) * | 2023-07-31 | 2023-08-29 | 杭州尚善若水环保科技有限公司 | Phosphorus-free prefilming combined reagent and circulating water phosphorus-free combined prefilming treatment method |
| CN116657128B (en) * | 2023-07-31 | 2023-10-03 | 杭州尚善若水环保科技有限公司 | Phosphorus-free prefilming combined reagent and circulating water phosphorus-free combined prefilming treatment method |
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