CN104326547B - A kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control method and device - Google Patents
A kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control method and device Download PDFInfo
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- CN104326547B CN104326547B CN201410568925.6A CN201410568925A CN104326547B CN 104326547 B CN104326547 B CN 104326547B CN 201410568925 A CN201410568925 A CN 201410568925A CN 104326547 B CN104326547 B CN 104326547B
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
- C23F15/005—Inhibiting incrustation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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Abstract
The present invention discloses a kind of coal unit Boiler High Pressure and to feed water micro-oxygen accurate control method: before oxygenation, stop adding hudrazine, close deaerator exhaust door, control therrmodynamic system hydrogen is led value and is less than 0.15 μ s/cm, and transforming beforehand control deoxygenator outlet dissolved oxygen amount scope is 30-50 μ g/L; Transforming and controlling deoxygenator outlet dissolved oxygen amount scope mid-term is 10-30 μ g/L; Transforming later stage control economizer entrance dissolved oxygen amount scope is 10-20 μ g/L.When economizer entrance dissolved oxygen represent number be less than deoxygenator outlet dissolved oxygen represent 60% of number time, count transform early stage; When economizer entrance dissolved oxygen represent number be deoxygenator outlet dissolved oxygen represent the 60-70% of number time, count transform mid-term; When economizer entrance dissolved oxygen represent number be greater than deoxygenator outlet dissolved oxygen represent 70% of number time, count transform the later stage.The method can reduce the corrosion of coal unit therrmodynamic system metal material and salification speed; Reduce superheater, reheater bursting risk.
Description
Technical field
The invention belongs to coal unit oiler feed processing technology field, be specifically related to a kind of coal unit Boiler High Pressure and feed water micro-oxygen accurate control method and device.
Background technology
Steam, as the cycle operation medium of fired power generating unit heat power equipment, serves the vital role realizing unit energy transformation.Water and steam quality and Water purification mode are significant to the corrosion prevention of heat power equipment, operation life and safety and economic operation.For reducing coal unit boiler thermodynamic system metal material erosion rate and heat power equipment fouling, salification speed, avoid flowing accelerated corrosion (FlowAcceleratedCorrosion, be called for short FAC), improve the safety and economic benefit of unit operation, suitable processing mode should be selected according to conditions such as the metal material of unit thermodynamic system, feedwater quality and features.
DL/T805.4-2004 " thermal power plant's carbonated drink chemistry directive/guide the 4th part: oiler feed process " gives three kinds of modes of oiler feed process, is respectively:
1) reductibility all-volatile treatment [AVT (R)]: the reductibility processing mode of condensed water in boiler, feed water ammonification and oxygen scavenger.AVT (R) processing mode be suitable for condition of water quality poor time stage capital construction phase.Under reductive condition, therrmodynamic system metallic surface defines double-deck Fe
3o
4oxide film, by the Fe of densification
3o
4inside stretch layer and porous, loose Fe
3o
4epitaxial film is formed, not shock-resistant, and water feeding system local easily FAC occurs, and settling punching is to places such as downstream economizer, water wall.The problems such as along with the improvement of unit condition of water quality, the corrosion prevention effect of AVT (R) processing mode to therrmodynamic system is poor, and ubiquity therrmodynamic system deposition is high, salification rate is high.
2) oxidisability all-volatile treatment [AVT (O)]: the processing mode of condensed water in boiler, a feedwater ammonification, belongs to oxidizing treatment method.But in actual applications, be often limited by the conditions such as unit self dissolved oxygen amount is not enough restriction, cause implementation result not good.
3) oxygenated treatment (OT): the processing mode of condensed water in boiler, feed water oxygenation.The ultimate principle of OT is total system oxygenation, comprises water wall, steam and draining system.Wide in range to the regulation of dissolved oxygen scope in standard DL/T805.1-2011 " thermal power plant's carbonated drink chemistry directive/guide part 1: oiler feed oxygenated treatment directive/guide ", require to control high-pressure feed water dissolved oxygen at 30-150 μ g/L, control main steam dissolved oxygen > 10 μ g/L.In actually operating, superheater, reheater oxide scale growth may be accelerated, peel off, increase booster risk.The Once-through Boiler of current employing oxygenated treatment technique, really has superheater, reheater oxide skin comes off, the existence of unit booster situation.
As described in Figure 1, oiler feed is divided into low pressure feed water and high-pressure feed water.Be called low pressure feed water from the feedwater of condensate pump 1, precision processing mixed bed 2, low pressure heater 3 to deoxygenator 4, be called high-pressure feed water from the feedwater of service pump 5, high pressure heater 6 to economizer 7.No matter adopt which kind of Water purification mode, water and steam all can have corrosive nature to the metallic substance of therrmodynamic system.Practice shows, adopts reductibility processing mode, and the high-pressure feed water section of super (super-) critical unit, under high temperature, condition of high voltage, is one of main portions producing FAC.Loose ferriferous oxide corrosion product migrates to the follow-up system such as economizer, water wall, with vapor deposition to turbine blade, causes therrmodynamic system high deposition rate and high salification rate.Feedwater oxidizing treatment mode makes therrmodynamic system metal deposition layer surface conversion become stable Fe by adding oxygenant (being generally oxygen)
2o
3, block Fe simultaneously
3o
4rete micropore, makes protective layer finer and close, effectively can take precautions against the generation of FAC, has good corrosion prevention effect, is the development trend of current fuel-burning power plant super (super-) critical coal unit oiler feed processing mode.But also there is certain drawback in simultaneous oxidation processing mode: dissolved oxygen too high in steam on accelerate superheater, reheater oxide skin growth, peel off and truly have impact.
The good corrosion prevention effect of therrmodynamic system will be pursued on the one hand by electricity power enterprise, improves economy and the security of unit operation; To reduce due to superheater, reheater oxide scale growth on the other hand, peel off the booster risk caused, therefore, urgently find the micro-oxygen accurate control method of high-pressure feed water safely and effectively and device.
Summary of the invention
The object of the invention is to provide a kind of coal unit Boiler High Pressure to feed water micro-oxygen accurate control method and device, and it can reduce fuel-burning power plant coal unit therrmodynamic system erosion rate and salification speed; Avoid because excess dissolved oxygen enters steam, superheater, reheater oxide scale growth accelerate, peel off the booster problem caused.
For achieving the above object, the present invention adopts following technical scheme:
A kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control method, is specially: before feed water oxygenation, stop adding hudrazine, close deaerator exhaust door, control therrmodynamic system hydrogen is led value and is less than 0.15 μ s/cm, and wherein, transforming beforehand control deoxygenator outlet dissolved oxygen amount scope is 30-50 μ g/L; Transforming and controlling deoxygenator outlet dissolved oxygen amount scope mid-term is 10-30 μ g/L; Transforming later stage control economizer entrance dissolved oxygen amount scope is 10-20 μ g/L.When economizer entrance dissolved oxygen represent number be less than deoxygenator outlet dissolved oxygen represent 60% of number time, count transform early stage; When economizer entrance dissolved oxygen represent number be deoxygenator outlet dissolved oxygen represent the 60-70% of number time, count transform mid-term; When economizer entrance dissolved oxygen represent number be greater than deoxygenator outlet dissolved oxygen represent 70% of number time, count transform the later stage.Add oxygen point optional before deoxygenator exports online dissolved oxygen table.
The micro-oxygen control method of high-pressure feed water of the present invention, adds dissolved oxygen before the steam feed pump entrance of deoxygenator downtake, and particular location is before deoxygenator outlet dissolved oxygen table sampling spot.In the different transformation stages, by monitoring deoxygenator outlet dissolved oxygen and economizer entrance dissolved oxygen numerical value, control feed water oxygenation amount.Before oxygenation, stop adding hudrazine, closes deaerator exhaust door, and control therrmodynamic system hydrogen is led value and is less than 0.15 μ s/cm, and guarantee precision processing hydrogen-form operation, condenser tightness is good, and dissolved oxygen in-line meter registration is accurate, can implement Feedwater oxygen treatment.
The micro-oxygen control method of high-pressure feed water of the present invention, in conversion in earlier stage, control deoxygenator outlet dissolved oxygen amount scope between 30-50 μ g/L, be exported to the high-pressure feed water section (high pressure heater) of economizer entrance in order to emphasis oxidation deoxygenator, by the Fe of metal deposition layer surface porosity
3o
4be oxidized to fine and close Fe
2o
3, form fine and close protective layer, now oxygen-consumption is comparatively large, and economizer entrance dissolved oxygen is substantially unchanged.Transforming mid-term, along with the fine and close Fe in high-pressure feed water section metallic surface
2o
3continuous formation, consume oxygen amount reduce gradually, now economizer entrance dissolved oxygen amount presents obvious ascendant trend.Therefore, suitably reduce oxygen-adding amount, continue to control deoxygenator outlet dissolved oxygen amount scope between 10-30 μ g/L.When economizer entrance dissolved oxygen represent number be greater than deoxygenator outlet dissolved oxygen represent 70% of number time, enter transform the later stage.Now, the fine and close Fe in high-pressure feed water section metallic surface
2o
3basically form, only need maintain local route repair and the well-oxygenated environment of whole system ferriferous oxide, oxygen consumed tolerance reduces, and controls economizer entrance dissolved oxygen amount at 10-20 μ g/L.
A kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control device, and it comprises the oxygen cylinder group, the first reducing valve and the second reducing valve that connect in turn, and the pipeline between described first reducing valve and the second reducing valve is made up of 2-6 oxygenation branch road of parallel connection; Described oxygenation branch road is provided with valve and under meter; Described oxygenation branch road is the stainless steel tube of diameter 1mm; Second reducing valve connects feed water oxygenation point.
Feed water oxygenation precise control device of the present invention, be the oxygen delivery pipeline of 5-7mm by the original internal diameter by specifying in standard DL/T805.1-2011, be replaced by and adopt the oxygenation branch road of 2-6 parallel connection to add oxygen point to control oxygen delivery and to be delivered to water, oxygenation branch road adopts effective diameter to be the stainless steel tube of 1mm, and each arm pressure-bearing is all greater than 2MPa.Like this, can reach effectively, control the object of feed water oxygenation amount accurately, with realize high-pressure feed water system ferriferous oxide abundant conversion, add oxygen at boiler economizer and water wall and approach exhaustion, do not enter steam system, reduce deposition and superheater, the acceleration of reheater oxide scale growth, peel off the risk with booster.
Compared with prior art, advantage of the present invention and beneficial effect are:
1) feed water oxygenation method of the present invention is by effectively, precisely controlling high-pressure feed water system trace dissolved oxygen, make dissolved oxygen at economizer or water wall discrete consuming totally, do not enter steam system, both the FAC problem of high-pressure feed water system had been solved, reduce therrmodynamic system deposition and salification rate, turn avoid oxide skin produce too fast, peel off, the problem of local stoppages, booster.
2) feed water oxygenation method of the present invention proposes the three phases of conversion process, and specify that dissolved oxygen Con trolling index and the conversion process node of three phases, easy to operate, risk is little.
3) the present invention's micro-oxygen control device controls oxygen-adding amount by designing this simple physics mode of low discharge branch road in parallel, effectively prevent due to people as the reasons such as mishandle cause excessive oxygen to enter steam.
Accompanying drawing explanation
Fig. 1 is the simplified schematic diagram of existing coal unit Boiler High Pressure water feeding system; In figure, 1 is condensate pump; 2 is precision processing mixed bed; 3 is low pressure heater (comprising #8, #7, #6, #5 low pressure heater respectively); 4 is deoxygenator; 5 is service pump; 6 is high pressure heater (comprising #3, #2, #1 high pressure heater respectively); 7 is economizer;
Fig. 2 is high-pressure feed water of the present invention micro-oxygen accurate control device structural representation; In figure, 8 is oxygen cylinder group; 9 is the first reducing valve; 10 is valve; 11 is under meter; 12 is the second reducing valve.
Embodiment
Now the present invention is further illustrated in conjunction with the accompanying drawings and embodiments, but protection scope of the present invention is not limited thereto.
embodiment 1
As shown in Figure 2, a kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control device, it comprises oxygen cylinder group 8, first reducing valve 9 and the second reducing valve 12 that connect in turn, and the pipeline between described first reducing valve 9 and the second reducing valve 12 is made up of 5 oxygenation branch roads of parallel connection; Described oxygenation branch road is provided with valve 10 and under meter 11; The stainless steel tube of described oxygenation branch road to be effective diameter be 1mm.Second reducing valve 12 connects feed water oxygenation point.Described oxygen cylinder group 8 is several oxygen cylinders.
A kind of coal unit Boiler High Pressure feeds water micro-oxygen accurate control method, is specially: before feed water oxygenation, stop adding hudrazine, close deaerator exhaust door, control therrmodynamic system hydrogen is led value and is less than 0.15 μ s/cm, and wherein, transforming beforehand control deoxygenator outlet dissolved oxygen amount scope is 30-40 μ g/L; Transforming and controlling deoxygenator outlet dissolved oxygen amount scope mid-term is 15-30 μ g/L; Transforming later stage control economizer entrance dissolved oxygen amount scope is 10-15 μ g/L; When economizer entrance dissolved oxygen represent number be less than deoxygenator outlet dissolved oxygen represent 70% of number time, count transform early stage; When economizer entrance dissolved oxygen represent number be deoxygenator outlet dissolved oxygen represent 70% of number time, count transform mid-term; When economizer entrance dissolved oxygen represent number be greater than deoxygenator outlet dissolved oxygen represent 70% of number time, count transform the later stage.
application example
For Henan 600MW unit, this power plant is from the capital construction phase, and feedwater adopts AVT (R) processing mode.Run 3 years, service pump pressure increase about 1.6MPa.Major overhaul checks, finds that water wall, economizer, turbine blade deposition are higher.For reducing deposition, improve security and the economy of unit operation, after to units matting, oxygenated treatment is implemented in the feedwater of this unit.
Implementation condition: (1) this unit condenser tightness is good, and condensed water dissolved oxygen is about 5-8 μ g/L; (2) therrmodynamic system hydrogen leads value at 0.06-0.07 μ s/cm; (3) precision processing hydrogen-form operation; (4) the online dissolved oxygen table of chemistry of condensed water, deoxygenator entrance, deoxygenator outlet, economizer entrance, main steam is calibrated; (5) stop adding hudrazine, closes deaerator exhaust door.
implementation process is as follows:
Oxygenation position: before deoxygenator exports online dissolved oxygen table sampling spot.At the conversion initial stage, deoxygenator outlet dissolved oxygen amount span of control is 30-40 μ g/L; Transform mid-term, economizer entrance dissolved oxygen amount presents obvious ascendant trend.Continue the scope maintaining deoxygenator outlet dissolved oxygen amount 15-30 μ g/L.When economizer entrance dissolved oxygen represents that number is after deoxygenator outlet dissolved oxygen represents 70% of number.Enter and transform the later stage, the oxygen-adding amount of adjustment high-pressure feed water, controlling economizer entrance dissolved oxygen amount is 10-15 μ g/L.
In implementation process, the changing conditions of monitoring economizer entrance iron and the change of main steam dissolved oxygen.
implementation result:
1) economizer entrance iron level.
Between transition phase, to the mensuration of the Continuous Tracking analysis of this unit steam operating parameter and feedwater iron-holder continuous high frequency time; Result shows, and iron has been basically stable at expected value 3 below the μ g/L required in standard GB/T12145-2008, and the ratio data being less than 3 μ g/L occupies 75%.
2) pipe cutting situation.
According to unit pipe sample check result after a year, economizer surface, in red-brown, is typical Fe
2o
3surface color, dirty layer is fine and close, without layering, with AVT(R) economizer tube sample surface deposits under processing mode is obviously divided into two-layer forming a sharp contrast.
Unit water wall, economizer fouling evaluation are reduced to a class by three classes.
3) service pump pressure changing.
Under identical parameters condition, ran for 2 years, service pump pressure change is 0.25MPa, and the increase of therrmodynamic system resistance is slower.
4) main steam dissolved oxygen changing conditions.
The registration of the online dissolved oxygen table of long-term follow main steam chemistry, finds that it does not have larger fluctuation.
From above-mentioned each situation: adopt the implementation result of high-pressure feed water oxidation treatment method of the present invention good, unit settling reduces, and steam dissolved oxygen is without considerable change.
Claims (1)
1. a coal unit Boiler High Pressure feeds water micro-oxygen accurate control method, it is characterized in that, before feed water oxygenation, stop adding hudrazine, close deaerator exhaust door, control therrmodynamic system hydrogen is led value and is less than 0.15 μ s/cm, and wherein, transforming beforehand control deoxygenator outlet dissolved oxygen amount scope is 30-50 μ g/L; Transforming and controlling deoxygenator outlet dissolved oxygen amount scope mid-term is 10-30 μ g/L; Transforming later stage control economizer entrance dissolved oxygen amount scope is 10-20 μ g/L; When economizer entrance dissolved oxygen represent number be less than deoxygenator outlet dissolved oxygen represent 60% of number time, count transform early stage; When economizer entrance dissolved oxygen represent number be deoxygenator outlet dissolved oxygen represent the 60-70% of number time, count transform mid-term; When economizer entrance dissolved oxygen represent number be greater than deoxygenator outlet dissolved oxygen represent 70% of number time, count transform the later stage.
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| CN108345323A (en) * | 2018-03-27 | 2018-07-31 | 润电能源科学技术有限公司 | A kind of control method and relevant device of feed water oxygenation amount |
| CN110030547A (en) * | 2019-05-13 | 2019-07-19 | 华润电力（沧州运东）有限公司 | Once-through Boiler thermodynamic system without deaerator and its oxygen content control method |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID HENAN ELECTRIC POWER Co. Patentee after: State Grid Corporation of China Co-patentee after: Henan jiuyu enpai Power Technology Co., Ltd Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID HENAN ELECTRIC POWER Co. Patentee before: State Grid Corporation of China Co-patentee before: HENAN ENPAI HIGH-TECH GROUP Co.,Ltd. |