CN104338704A - Method and device for cleaning air preheater of coal-fired power plant boiler SCR (selective catalytic reduction) denitration system online - Google Patents
Method and device for cleaning air preheater of coal-fired power plant boiler SCR (selective catalytic reduction) denitration system online Download PDFInfo
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- CN104338704A CN104338704A CN201410471091.7A CN201410471091A CN104338704A CN 104338704 A CN104338704 A CN 104338704A CN 201410471091 A CN201410471091 A CN 201410471091A CN 104338704 A CN104338704 A CN 104338704A
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- air preheater
- coal
- power plant
- water
- denitration system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2203/00—Details of cleaning machines or methods involving the use or presence of liquid or steam
- B08B2203/007—Heating the liquid
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a method and a device for cleaning an air preheater of a coal-fired power plant boiler SCR (selective catalytic reduction) denitration system online. The method and the device are characterized in that the pH value of condensate water is adjusted to 8.6-9.3, and the condensate water is heated to a temperature of 80-90 DEG C as washing water for cleaning the air preheater online, with the irrigation pressure of 0.5-1.0Mpa; the condensate water is from an outlet main pipe of a precision processing mixed bed of a boiler thermal system. Through the method and the device, the air preheater is cleaned online under a low-rotation speed operating condition by controlling the temperature and the pH value of the washing water and setting the washing pressure and other parameters, so that ammonium bisulfate sediment on the surface of the air preheater can be effectively removed, and blockage and corrosion of the air preheater are reduced.
Description
technical field
The invention belongs to coal-fired boiler in thermal power plant gas denitrifying technology field, be specifically related to a kind of on-line cleaning method and device of coal-fired boiler in thermal power plant SCR denitration system air preheater.
background technology
Along with the issuing and implementation of GB 13223-2011 " thermal power plant atmosphere pollutants emission standards ", there has been stricter requirement in country to the concentration of emission of thermal power plant coal unit nitrogen oxide.Denitrating system must be installed by coal-burning power plant, could meet the requirement of effluent standard.In denitrating technique, selective catalytic reduction (SCR) is because the advantages such as structure is simple, denitration efficiency is high, reliable, technology is more ripe are in coal-burning power plant's extensive use.But along with the operation of denitrating system, blocking and the etching problem of air preheater (hereinafter referred to as " air preheater ") also can not be ignored.
The air preheater in thermal power plant is the important component part of boiler, is a kind of heat-exchange apparatus utilizing flue gas heat to heat, is positioned at the afterbody of boiler vertical convection flue.
Benitration reactor is with NH
3for reducing agent, by the NO in flue gas
xbe reduced to N
2, a small amount of SO existed in flue gas
2sO is oxidized to by denitrating catalyst
3.In the medium/low temperature section of air preheater, the escape ammonia in SCR exiting flue gas, SO
3with steam generation chemical reaction, generate viscosity is large, corrosivity is strong sulfate of ammoniac and hydrogen sulfate ammonia, its chemical equation is as follows:
NH
3+SO
3+H
2O→NH
4HSO
4
2NH
3+ SO
3+H
2O→(NH
4)
2SO
4
For improving denitration efficiency, usually control NH
3/ NO
xmol ratio > 1, therefore, the escaping of ammonia is inevitable.SCR denitration system is arranged between economizer and air preheater, through the flue-gas temperature of air preheater generally at 120 ~ 450 DEG C, and NH
4hSO
4fusing point be 147 DEG C, boiling point is 350 DEG C, NH
4hSO
4in air preheater, low-temperature zone liquefies, liquid NH
4hSO
4have strong cohesive property and corrosivity, easily bond soot particle, forms sticky, hard deposit, causes blocking and the corrosion of air preheater middle-temperature section and cold section, cause running resistance to increase, device damage.If take measures not in time, air-introduced machine pressure head will be caused inadequate, cause compressor emergency shutdown, economic loss is heavy, and safety, the stable operation of unit exist hidden danger.At present, the blocking of the air preheater caused due to ammonium hydrogen sulfate and etching problem have become the common and problem demanding prompt solution of thermal power plant.
For solving blocking and the etching problem of air preheater, the method usually taked has:
(1) air preheater transformation.As cold junction and intermediate ends air preheater heating surface material being replaced by the modes such as plating enamel material, alleviate the corrosion of heating surface.But the transformation of air preheater must utilize the meeting of compressor emergency shutdown servicing machine, the limited time, and costly;
(2) steam soot blowing and high pressure water washing.For the SCR system run, the adhesive formed due to ammonium hydrogen sulfate and soot particle is attached to heat-transfer surface, and sticky, the hardware features shown, only cannot effectively remove by steam soot blowing.Data is had to show, as ammonia slip concentration and SO
3when concentration is greater than 2mg/L, the poor effect of steam sootblower, needs to remove by water flushing method.But high pressure water washing need utilize the chance of compressor emergency shutdown just can carry out.
For operating unit, ammonium hydrogen sulfate deposits the harm caused on air preheater heat exchange element not yet good solution.Because coal-burning boiler as-fired coal ature of coal changes and NH in the improper flue gas caused of the escaping of ammonia control
3escape concentration, SO
3concentration and H
2the ammonium hydrogen sulfate that the change of O concentration brings blocks and corrodes the problems demand solution of air preheater.Therefore, a kind of online water douching technique of research and development, effectively to alleviate and to solve the blocking of operating unit air preheater and the etching problem of the meeting of no shutdown servicing machine, reduces because air preheater resistance increases, the compressor emergency shutdown risk that air-introduced machine pressure head causes not, significant.
summary of the invention
The object of the invention is the on-line cleaning method and the device that provide a kind of coal-fired boiler in thermal power plant SCR denitration system air preheater, it does not need too much scrap build and investment, can effectively solve gentle to separate the air preheater blocking and etching problem that ammonium hydrogen sulfate causes.
For achieving the above object, the present invention adopts following technical scheme:
A kind of on-line cleaning method of coal-fired boiler in thermal power plant SCR denitration system air preheater, condensate water pH value is adjusted to 8.6-9.3 by it, and be heated to carry out on-line cleaning as flushing water to air preheater after temperature is 80-90 DEG C, flushing pressure 0.5-1.0 Mpa.
Concrete, described condensate water is from the outlet mother pipe of boiler thermodynamic system precision processing mixed bed.
Concrete, can add adsorbed film type corrosion inhibiter in flushing water, it is 0.1-0.3% that the interpolation concentration of adsorbed film type corrosion inhibiter controls the mass percent concentration in flushing water at 0.1-0.3%(and corrosion inhibiter), to alleviate and to avoid the corrosion of air preheater.
In flushing process, control washing water quantity at 50-80t/h; Washing time was advisable at 1-4 hours.
A kind of on-line cleaning device of coal-fired boiler in thermal power plant SCR denitration system air preheater, it comprises condensate polishing treatment mixed bed, the outlet mother of described condensate polishing treatment mixed bed is divided into two branch roads after managing and collecting with the pipeline from ammoniacal liquor dosing pump, one of them branch road connects low-pressure heater, and another branch road connects flush box, flush water pump and air preheater in turn; Described flush box also heats header with auxiliary vapour and is connected.
The inventive method and device carry out on-line cleaning under air preheater slow-speed of revolution service condition; Its innovative point is: utilize existing boiler thermodynamic system precision processing mixed bed to export the condensate water of female pipe as flushing water water source, regulates the pH value of flushing water 8.6-9.3 by adjustment ammonia residual.Different according to season, condensate water water temperature is generally at 30-55 DEG C, by increasing flush box, condensate water is heated to 80-90 DEG C of laggard row air preheater on-line cleaning by the steam (, generally at 160-220 DEG C, steam pressure is generally at 0.6-1MPa for vapor (steam) temperature) utilizing auxiliary vapour to heat header.
Apparatus of the present invention are by setting up cleaning water tank, the steam utilizing auxiliary vapour to heat header carries out on-line cleaning as flushing water water source after condensate water is heated to 80-90 DEG C, and further by adding corrosion inhibiter, the condition optimizing cleaning methods such as setting flushing pressure, flow, time.Wherein, controlling the pH value range of condensate water by adjustment ammonia residual, improving corrosion protection effect by adding corrosion inhibiter.
Compared with prior art, advantage of the present invention and beneficial effect are:
1) on-line cleaning method is not by time restriction, and effectively can remove air preheater heat exchange element surface ammonium hydrogen sulfate deposit, solves the operating unit air preheater blocking of no shutdown servicing machine meeting and the technical barrier of corrosion;
2) cleaning performance is good, effectively can remove the deposit being bonded in air preheater surface that ammonium hydrogen sulfate and flying dust etc. are formed, and alleviates and solves air preheater blockage problem, reducing air preheater resistance, greatly reducing compressor emergency shutdown risk;
3) effectively solve because ammonium hydrogen sulfate deposit adheres to the air preheater equipment corrosion caused, reduce problem in service life;
4) do not need to carry out more transformation to system, invest little.
accompanying drawing explanation
Fig. 1 is the structural representation of cleaning device of the present invention, and in figure, 4 is condensate polishing treatment mixed bed; 5 is ammoniacal liquor dosing pump; 6 is low-pressure heater; 7 is auxiliary vapour heating header; 8 is flush box; 9 is flush water pump; 10 is air preheater.
detailed description of the invention
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.
test example
Following test objective is checking flushing water to the dispersion effect of dirt and corrosion inhibiter to corrosion of metal protection effect.
1) in actual production, test finds: the deposit (in deposit, ammonium hydrogen sulfate content is about 50 μ g/g) on air preheater heat exchange element is dissolved in the condensate water of getting in power plant, condensate water pH value is 8.85, after deposit is dissolved in condensate water, pH value is about 3.14, in process of the test, fine particle is separated into by original lamellar morphology at once after the deposit observing air preheater heat exchange element surface is dissolved in condensate water, illustrate that it is good to deposit breakup, implement on-line cleaning method of the present invention at the scene, can by sticky, hard deposit breakup is fine particle, rinse well, the caking property problem of ammonium hydrogen sulfate and soot particle can be solved well.
2) in condensate water, add the adsorbed film type corrosion inhibiter that concentration is 0.1%, carry out the testing experiment of corrosion rate with A3 carbon steel.
Experimental condition: temperature 90 DEG C, the time: 4 hours.
Result of the test: the corrosion rate adding corrosion inhibiter test is 0.36g/ (m
2h), require that corrosion rate is less than 8 g/ (m with reference to DL/T 794-2012 " heat power plant boiler cleaning directive/guide "
2h) requirement, illustrates that corrosion mitigating effect is outstanding.
embodiment 1
An on-line cleaning method for coal-fired boiler in thermal power plant SCR denitration system air preheater, is specially: condensate water ammonification is adjusted to pH value and is about 8.8, and is heated to carry out on-line cleaning as flushing water after temperature is about 82 DEG C, flushing pressure about 0.5 Mpa.Described condensate water is from the outlet mother pipe of boiler thermodynamic system precision processing mixed bed.In flushing water, add adsorbed film type corrosion inhibiter, the interpolation concentration of corrosion inhibiter controls about 0.2%.In flushing process, control washing water quantity and be about 80t/h; Washing time is 2 hours.
As shown in Figure 1, a kind of on-line cleaning device of coal-fired boiler in thermal power plant SCR denitration system air preheater, it comprises condensate polishing treatment mixed bed 4, the outlet mother of described condensate polishing treatment mixed bed 4 is divided into two branch roads after managing and collecting with the pipeline from ammoniacal liquor dosing pump 5, one of them branch road connects low-pressure heater 6, and another branch road connects flush box 8, flush water pump 9 and air preheater 10 in turn; Described flush box 8 also heats header 7 with auxiliary vapour and is connected.
In apparatus of the present invention: the exhaust steam in turbine low pressure cylinder enters condensate polishing treatment mixed bed 4 through hot well and condensate pump, after condensate polishing treatment mixed bed 4 condensate water out mixes with the ammoniacal liquor from ammoniacal liquor dosing pump 5, pH value is adjusted to about 8.8, wherein a part delivers to low-pressure heater 6, another part delivers to flush box 8, by from auxiliary vapour heating header 7 be steam heated to about 82 DEG C after, deliver to air preheater 10 through flush water pump 9, as flushing water, on-line cleaning carried out to air preheater 10.
Certain 600MW unit air preheater design pressure difference is 1.3kPa, runs about after 8 months, and air preheater pressure reduction measuring point show value is between 2.5-3.0kPa, and blocking is serious.Due to this factory's no shutdown chance, for reducing air preheater running resistance, avoiding because air-introduced machine pressure head causes compressor emergency shutdown accident not, adopting method and apparatus described in embodiment 1 to implement on-line cleaning to this factory's air preheater.
Implement after washing down, this unit air preheater pressure reduction is reduced to 1.2-1.5 kPa, and pressure reduction reduces significantly, to illustrate that implementation result is good.
embodiment 2
An on-line cleaning method for coal-fired boiler in thermal power plant SCR denitration system air preheater, is specially: condensate water ammonification is adjusted to pH value and is about 9.2, and to be heated to temperature be carry out on-line cleaning as flushing water after 90 DEG C, flushing pressure about 0.9 Mpa.Described condensate water is from the outlet mother pipe of boiler thermodynamic system precision processing mixed bed.In flushing water, add adsorbed film type corrosion inhibiter, the interpolation concentration of corrosion inhibiter controls 0.1%.In flushing process, control washing water quantity at 55t/h; Washing time is 3 hours.
The on-line cleaning device of described coal-fired boiler in thermal power plant SCR denitration system air preheater is see embodiment 1.
Claims (5)
1. the on-line cleaning method of a coal-fired boiler in thermal power plant SCR denitration system air preheater, it is characterized in that, condensate water pH value is adjusted to 8.6-9.3, and is heated to carry out on-line cleaning as flushing water to air preheater after temperature is 80-90 DEG C, flushing pressure 0.5-1.0 Mpa.
2. the on-line cleaning method of coal-fired boiler in thermal power plant SCR denitration system air preheater as claimed in claim 1, is characterized in that, described condensate water is from the outlet mother pipe of boiler thermodynamic system precision processing mixed bed.
3. the on-line cleaning method of coal-fired boiler in thermal power plant SCR denitration system air preheater as claimed in claim 1, it is characterized in that, add adsorbed film type corrosion inhibiter in flushing water, the interpolation concentration of adsorbed film type corrosion inhibiter controls 0.1-0.3%.
4. the on-line cleaning method of coal-fired boiler in thermal power plant SCR denitration system air preheater as claimed in claim 1, is characterized in that, controls washing water quantity at 50-80t/h; Washing time 1-4 hours.
5. the on-line cleaning device of a coal-fired boiler in thermal power plant SCR denitration system air preheater, it is characterized in that, comprise condensate polishing treatment mixed bed, the outlet mother of described condensate polishing treatment mixed bed is divided into two branch roads after managing and collecting with the pipeline from ammoniacal liquor dosing pump, one of them branch road connects low-pressure heater, and another branch road connects flush box, flush water pump and air preheater in turn; Described flush box also heats header with auxiliary vapour and is connected.
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|---|---|---|---|
| CN201410471091.7A CN104338704A (en) | 2014-09-16 | 2014-09-16 | Method and device for cleaning air preheater of coal-fired power plant boiler SCR (selective catalytic reduction) denitration system online |
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|---|---|---|---|
| CN201410471091.7A CN104338704A (en) | 2014-09-16 | 2014-09-16 | Method and device for cleaning air preheater of coal-fired power plant boiler SCR (selective catalytic reduction) denitration system online |
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| CN104338704A true CN104338704A (en) | 2015-02-11 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990452A (en) * | 2015-08-06 | 2015-10-21 | 长沙天瑞能源科技有限公司 | Method solving air preheater dust clogging problem and intelligent online flushing system |
| CN110360871A (en) * | 2019-06-25 | 2019-10-22 | 华电电力科学研究院有限公司 | A kind of air preheater off-line cleaning device and its working method |
| CN110369407A (en) * | 2019-06-14 | 2019-10-25 | 华电电力科学研究院有限公司 | A kind of air preheater on-line cleaning device |
| CN114857961A (en) * | 2022-04-25 | 2022-08-05 | 内蒙古大板发电有限责任公司 | Power plant boiler system capable of preventing air preheater from being blocked |
| CN116428607A (en) * | 2023-06-14 | 2023-07-14 | 浙江程润云环境科技有限公司 | Denitration anti-blocking air preheater method and system |
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Cited By (8)
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| CN104990452A (en) * | 2015-08-06 | 2015-10-21 | 长沙天瑞能源科技有限公司 | Method solving air preheater dust clogging problem and intelligent online flushing system |
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| CN110360871A (en) * | 2019-06-25 | 2019-10-22 | 华电电力科学研究院有限公司 | A kind of air preheater off-line cleaning device and its working method |
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| CN114857961A (en) * | 2022-04-25 | 2022-08-05 | 内蒙古大板发电有限责任公司 | Power plant boiler system capable of preventing air preheater from being blocked |
| CN114857961B (en) * | 2022-04-25 | 2024-03-01 | 内蒙古大板发电有限责任公司 | Power plant boiler system for preventing air preheater from being blocked |
| CN116428607A (en) * | 2023-06-14 | 2023-07-14 | 浙江程润云环境科技有限公司 | Denitration anti-blocking air preheater method and system |
| CN116428607B (en) * | 2023-06-14 | 2023-10-20 | 浙江程润云环境科技有限公司 | Denitration anti-blocking air preheater method and system |
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