CN109019888A - Electric power plant circulating water system method for treating water - Google Patents
Electric power plant circulating water system method for treating water Download PDFInfo
- Publication number
- CN109019888A CN109019888A CN201811107032.6A CN201811107032A CN109019888A CN 109019888 A CN109019888 A CN 109019888A CN 201811107032 A CN201811107032 A CN 201811107032A CN 109019888 A CN109019888 A CN 109019888A
- Authority
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- China
- Prior art keywords
- water
- condenser
- cleaning case
- film
- power plant
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- 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.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/14—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing phosphorus
Abstract
The present invention is electric power plant circulating water system method for treating water, comprising the following steps: 1) to sulfamic acid is added in the cooling water being passed through in condenser；2) cleaning case is rinsed with industry water；3) start separate unit cleaning pump when to cleaning case into industry water to 2/3 water level, to condenser fill cycle, after corrosion inhibiter circulation dissolution is added when air gate water outlet, cleaning case low water level, into cleaning case acid adding to system acid concentration up to 5% when stop acid adding；4) water flushing and copper pipe surface pretreatment are carried out after pickling；5) it forms a film；Cleaning case starts separate unit cleaning pump along the inverse open condenser that rinses to the not aobvious red of draining phenolphthalein, changes the flushing of dual stage pump circulation into industry water；6) water rinses after forming a film；7) film-formation result inspection and evaluation are cleaned；The invention proposes electric power plant circulating water system method for treating water, greatly reduce the phenomenon that condenser corrodes, ensure that the stabilization of circulation.
Description
Technical field
The present invention relates to Circulated water system of thermal power plant more particularly to electric power plant circulating water system method for treating water.
Background technique
In the thermal power plant in China, Generation Unit Condenser caused by being dealt with improperly due to recirculating cooling water system
Corrosion and scaling problem is commonplace.Condenser corrosion easily causes copper pipe perforation, cracking, increase equipment repair time and time
Number shortens the service life of equipment, reduces generated energy, increases cost of electricity-generating；On the one hand condenser fouling leads to underdeposit corrosion, separately
On the one hand the heat exchanger effectiveness (thus influencing production efficiency) for reducing heat exchanger, increases energy consumption.In normal operational condition
Under, the vacuum degree of condenser falls to 89%~92%.If the performance of used corrosion inhibiting and descaling agent is improper, lead to system one
The fouling for determining degree makes the vacuum degree of condenser fall to 86%~89%, this will make the heat consumption increase 4.5%~7.5% that generates electricity,
Coal consumption for power generation increases 8~l4g/ (kWh).If it is considered that caused by the corrosion of cleaning during shutdown, equipment and increase frequency of maintenance etc.
Related consequence, economic loss are abnormal surprising.In short, direct result caused by condenser corrosion and scaling is exactly condenser
Vacuum degree decline, steam power output reduce, normal production cycles shorten, equipment life reduces, operating cost improves, under production efficiency
Drop, brings huge economic loss.Therefore, the corrosion and fouling of recirculating cooling water system are prevented using economic effective means
It is very important.
Summary of the invention
In order to solve the technical problem in the presence of background technology, the invention proposes electric power plant circulating water system water process sides
Method greatly reduces the phenomenon that condenser corrodes, ensure that the stabilization of circulation.
The technical solution of the invention is as follows:
Electric power plant circulating water system method for treating water, it is characterised in that: the treating method comprises following steps:
1) to sulfamic acid is added in the cooling water being passed through in condenser；
2) cleaning case is rinsed with industry water, completely backward cleaning case starts cleaning pump flushing and face case to be cleaned into industry water
Shi Guandao and condenser；Inspection system tightness, rinses to water and carries out Double pump circulation flushing afterwards clearly, and last termination of pumping discharges water；
3) start separate unit cleaning pump when to cleaning case into industry water to 2/3 water level and work as air gate to condenser fill cycle
After corrosion inhibiter circulation dissolution is added when water outlet, cleaning case low water level, into cleaning case acid adding to system acid concentration up to 5% when stop
Acid adding；
4) water flushing and copper pipe surface pretreatment are carried out after pickling；
5) it forms a film；Cleaning case starts separate unit cleaning pump and does not show along inverse open condenser to the draining phenolphthalein that rinses into industry water
Red changes the flushing of dual stage pump circulation.Liquor box controls low water level, and 20% ferrous sulfate concentrated solution, control system Fe is added2+It is dense
Degree is 50~100mg/L, pH value is 5.5~6.5, adjusts pH value with industry water, forms a film along inverse iterative cycles；
6) water rinses after forming a film；Cleaning case starts the open termination of pumping after rinsing extremely draining clarification of dual stage pump, system into industry water
Water emptying terminates film forming, and condenser restores；
7) film-formation result inspection and evaluation are cleaned；After cleaning film forming, cleaning inspection is carried out to condenser water box, cleaning case
It looks into, and extracts copper pipe inspection cleaning film-formation result；
The additional amount of above-mentioned sulfamic acid is 0.1-0.3g/L.
Above-mentioned steps 2) in industry water turbidity be less than 2mg/L；Each water chamber air gate perennial draingage of condenser during flushing is
Unite pressure≤0.2MPa.
Above-mentioned steps 4) comprise the concrete steps that: starting separate unit cleaning pump along inverse big flow it is open rinse to draining pH value > 5,
Then total iron≤50mg/L changes the flushing of dual stage pump circulation, tertiary sodium phosphate 800kg is added, control pH value is 9~10, after recycling 2h
Discharge.
Above-mentioned steps 5) in film forming when industry water be continuously replenished guarantee in solution containing enough dissolved oxygens and draining in time
Part solution adds 20% ferrous sulfate concentrated solution, keeps cleaning case normal level, and circulation forms a film after 96h, and system is all arranged
It is empty.
Above-mentioned steps 7) in effect assessment standard are as follows: descaling rate > 90%；Metallic matrix rate of corrosion < 10g/ (m2·h)；It protects
Cuticula is uniform.
Above-mentioned steps 2) it further include later step 2.1) corrosion-mitigation scale-inhibition agent-feeding treatment；Medicament used is PBTCA (2- phosphonic acids
Base-l, 2,4- butane tricarboxylates), PESA (poly-epoxy succinic acid), POCA (poly-epoxy succinic acid) or PAPEMP (polyamino polyether
Base organic phosphoric acid).
Method of the invention keeps stable cycles of concentration and stable water quality；For the system of water stabilization, medicament is
It can preferably play a role, for the system with constant water supply source, strict control cycles of concentration；For not having constant benefit
The system that water water source or part supplement weak acid softened water, controls the ratio of various moisturizings, to guarantee the stabilization of system water quality as far as possible；
System for adjusting basicity with sulfuric acid, the speed that strict control continuously adds.To used water treatment agent, it is familiar with medicament
The performances such as hardness tolerance, basicity tolerance.
The online corrosion of carbon steel rate of method for treating water thermoelectric cycle water system through the invention is by original 0.15mm/a
More than, 0.02mm/a or less drops.Day-to-day operation quality testing uses the unified examination criteria of middle petrochemical industry, monitors heat exchanger
HSN70-1A Copper Tube Corrosion rate 0.002mm/a, deposition rate 2.27mcm；Copper Tube Corrosion rate 0.0029mm/a, deposition rate
3.16mcm；And without local corrosion.Old copper has carried out the plane pipe inspection of pumping pipe, and inner wall is clean, corrosion-free.
Specific embodiment
The invention proposes a kind of electric power plant circulating water system method for treating water, comprising the following steps:
1) to sulfamic acid is added in the cooling water being passed through in condenser；The additional amount of sulfamic acid is 0.1-0.3g/L；
2) cleaning case is rinsed with industry water, completely backward cleaning case starts cleaning pump flushing and face case to be cleaned into industry water
Shi Guandao and condenser；Inspection system tightness, rinses to water and carries out Double pump circulation flushing afterwards clearly, and last termination of pumping discharges water；Industry
The turbidity of water is less than 2mg/L；Each water chamber air gate perennial draingage of condenser, system pressure≤0.2MPa during flushing；
2.1) corrosion-mitigation scale-inhibition agent-feeding treatment；Medicament used is PBTCA (2- phosphonic acid base-l, 2,4- butane tricarboxylates), PESA
(poly-epoxy succinic acid), POCA (poly-epoxy succinic acid) or PAPEMP (polyamino polyether base organic phosphoric acid).
PBTCA (2- phosphonic acid base-l, 2,4- butane tricarboxylates) have excellent anticorrosion-antiscaling property, high temperature resistant, resistance to oxidation,
There is excellent inhibiting effect to calcium carbonate scale, there is good synergistic effect with organic phosphate, zinc salt etc..PESA (polycyclic
Oxydisuccinic acid) there is excellent chemical stability and thermal stability, excellent antiscaling dispersion is all had to calcium carbonate, calcium sulfate and is made
With compounding with zinc salt has excellent corrosion and scale inhibition performance, is a kind of without phosphorus, non-nitrogen, the green for having preferable biodegradability
Water treatment agent.POCA (phosphono-carboxylic acids) and PAPEMP (polyamino polyether base organic phosphoric acid) has very high calcium tolerance and excellent
Good chemical stability, inoxidizability (hardly being acted on chlorine) and thermostabilization；It is tried according to circulating water quality and corrosion inhibiting and descaling agent
Operation conditions completes the optimization of recirculated water corrosion-mitigation scale-inhibition reagent combination, using continuous dosing mode, starts dosing pump and starts to add
Medicine controls dosage using " stroke adjustment " or " rate adaptation " of dosing pump, and dosage adjusts standard and executes by table 1.Inhibition
Scale inhibitor dosing rate is adjusted according to rate of water make-up, and rate of water make-up is controlled dosing by seasonal effect, timely analysis system total phosphorus
Amount.
Table 1
After putting into corrosion-mitigation scale-inhibition processing, monitoring mouth is installed additional on water circulating pump and condenser outlet conduit, monthly periodically inspection
Anticorrosion-antiscaling effect and corrosion rate are looked into, timing analysis circulating water quality situation of change grasps having for tracking corrosion-mitigation scale-inhibition technique
Effect property, strict control recirculated water periodical blowdown improve corrosion inhibiting and descaling agent and efficiency are recycled, and reduce medicine consumption.
3) start separate unit cleaning pump when to cleaning case into industry water to 2/3 water level and work as air gate to condenser fill cycle
After corrosion inhibiter circulation dissolution is added when water outlet, cleaning case low water level, into cleaning case acid adding to system acid concentration up to 5% when stop
Acid adding；General 1~2h, pickling terminal point control acid concentration are not less than 0.5%, cleaning solution in cleaning case are first discharged after pickling,
Start to discharge condenser system acid solution after to cleaning case into industry water to high liquid level；
4) water flushing and copper pipe surface pretreatment are carried out after pickling；Start separate unit cleaning pump to rinse extremely along inverse big flow is open
Drain pH value > 5, total iron≤50mg/L, then change dual stage pump circulation flushing, be added tertiary sodium phosphate 800kg, control pH value be 9~
10, it is discharged after recycling 2h；
5) it forms a film；Cleaning case starts separate unit cleaning pump and does not show along inverse open condenser to the draining phenolphthalein that rinses into industry water
Red changes the flushing of dual stage pump circulation.Liquor box controls low water level, and 20% ferrous sulfate concentrated solution, control system Fe is added2+It is dense
Degree is 50~100mg/L, pH value is 5.5~6.5, adjusts pH value with industry water, forms a film along inverse iterative cycles；It is constantly mended when film forming
It fills industry water to guarantee to contain enough dissolved oxygens in solution and drain part solution in time, adds 20% ferrous sulfate concentrated solution,
Cleaning case normal level is kept, circulation forms a film after 96h, and system all empties；
6) water rinses after forming a film；Cleaning case starts the open termination of pumping after rinsing extremely draining clarification of dual stage pump, system into industry water
Water emptying terminates film forming, and condenser restores；
7) film-formation result inspection and evaluation are cleaned；After cleaning film forming, cleaning inspection is carried out to condenser water box, cleaning case
It looks into, and extracts copper pipe inspection cleaning film-formation result；Effect assessment standard are as follows: descaling rate > 90%；Metallic matrix rate of corrosion < 10g/
(m2·h)；Protective film is uniform.
Claims (7)
1. electric power plant circulating water system method for treating water, it is characterised in that: the treating method comprises following steps:
1) to sulfamic acid is added in the cooling water being passed through in condenser；
2) cleaning case is rinsed with industry water, completely backward cleaning case starts cleaning pump and rinse interim pipe case to be cleaned into industry water
Road and condenser；Inspection system tightness, rinses to water and carries out Double pump circulation flushing afterwards clearly, and last termination of pumping discharges water；
3) start separate unit cleaning pump when to cleaning case into industry water to 2/3 water level, to condenser fill cycle, when air gate goes out
After corrosion inhibiter circulation dissolution is added when water, cleaning case low water level, into cleaning case acid adding to system acid concentration up to 5% when stop plus
Acid；
4) water flushing and copper pipe surface pretreatment are carried out after pickling；
5) it forms a film；Cleaning case starts separate unit cleaning pump along the inverse open condenser that rinses and extremely drains the not aobvious red of phenolphthalein into industry water,
Change the flushing of dual stage pump circulation.Liquor box controls low water level, and 20% ferrous sulfate concentrated solution, control system Fe is added2+Concentration be
50~100mg/L, pH value are 5.5~6.5, adjust pH value with industry water, form a film along inverse iterative cycles；
6) water rinses after forming a film；Cleaning case starts the open termination of pumping after rinsing extremely draining clarification of dual stage pump, system water row into industry water
Sky terminates film forming, and condenser restores；
7) film-formation result inspection and evaluation are cleaned；After cleaning film forming, dress watch is carried out to condenser water box, cleaning case,
And extract copper pipe inspection cleaning film-formation result.
2. electric power plant circulating water system method for treating water according to claim 1, it is characterised in that: described in the step 1)
The additional amount of sulfamic acid is 0.1-0.3g/L.
3. electric power plant circulating water system method for treating water according to claim 2, it is characterised in that: industrial in the step 2)
The turbidity of water is less than 2mg/L；Each water chamber air gate perennial draingage of condenser, system pressure≤0.2MPa during flushing.
4. electric power plant circulating water system method for treating water according to claim 3, it is characterised in that: the step 4) it is specific
Step is: starting separate unit cleaning pump is rinsed along inverse big flow is open to draining pH value > 5, total iron≤50mg/L, and dual stage pump is then changed
Tertiary sodium phosphate 800kg is added in circulation flushing, and control pH value is 9~10, discharges after recycling 2h.
5. electric power plant circulating water system method for treating water according to claim 3, it is characterised in that: film forming in the step 5)
When industry water be continuously replenished guarantee to add 20% ferrous sulfate containing enough dissolved oxygens and part solution is drained in time in solution
Concentrated solution keeps cleaning case normal level, and circulation forms a film after 96h, and system all empties.
6. electric power plant circulating water system method for treating water according to claim 5, it is characterised in that: effect in the step 7)
Evaluation criterion are as follows: descaling rate > 90%；Metallic matrix rate of corrosion < 10g/ (m2·h)；Protective film is uniform.
7. electric power plant circulating water system method for treating water according to any one of claims 1 to 6, it is characterised in that: the step
It 2) further include step 2.1) corrosion-mitigation scale-inhibition agent-feeding treatment after；Medicament used is PBTCA (2- phosphonic acid base-l, 2,4- tricarboxylic acids fourths
Alkane), PESA (poly-epoxy succinic acid), POCA (poly-epoxy succinic acid) or PAPEMP (polyamino polyether base organic phosphoric acid).
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| CN201811107032.6A CN109019888A (en) | 2018-09-21 | 2018-09-21 | Electric power plant circulating water system method for treating water |
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| CN201811107032.6A CN109019888A (en) | 2018-09-21 | 2018-09-21 | Electric power plant circulating water system method for treating water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109912050A (en) * | 2019-03-20 | 2019-06-21 | 河钢股份有限公司承德分公司 | A kind of method for treating water inhibiting boiler corrosion |
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2018
- 2018-09-21 CN CN201811107032.6A patent/CN109019888A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109912050A (en) * | 2019-03-20 | 2019-06-21 | 河钢股份有限公司承德分公司 | A kind of method for treating water inhibiting boiler corrosion |
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| PB01 | Publication | ||
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Application publication date: 20181218 |