CN106224989B - A kind of online method for removing the stifled ash of ammonium hydrogen sulfate in coal-burning power plant's air preheater - Google Patents
A kind of online method for removing the stifled ash of ammonium hydrogen sulfate in coal-burning power plant's air preheater Download PDFInfo
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- CN106224989B CN106224989B CN201610582074.XA CN201610582074A CN106224989B CN 106224989 B CN106224989 B CN 106224989B CN 201610582074 A CN201610582074 A CN 201610582074A CN 106224989 B CN106224989 B CN 106224989B
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- CN
- China
- Prior art keywords
- air preheater
- air
- hydrogen sulfate
- ammonium hydrogen
- power plant
- Prior art date
- 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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- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 16
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010977 unit operation Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 2
- 230000000877 morphologic effect Effects 0.000 abstract description 2
- 230000007704 transition Effects 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 229910021529 ammonia Inorganic materials 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical group [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
Abstract
The invention discloses a kind of online methods for removing the stifled ash of ammonium hydrogen sulfate in coal-burning power plant's air preheater.It by adjusting pressure fan and air-introduced machine aperture, controls air preheater exhaust gas temperature, on the one hand high temperature is utilized to promote ammonium hydrogen sulfate Morphological Transitions, eliminated the effects of the act by steam blowing under low loading conditions；On the other hand it is rinsed using online high pressure lye, ammonium hydrogen sulfate is promoted to decompose, blocked to eliminate.The present invention can effectively reduce air preheater resistance, to improving unit operation stability, reduce operating cost and have important practical significance.
Description
Technical field
The present invention relates to coal-burning power plant air preheater fields, and in particular to sulphur in a kind of online removing coal-burning power plant air preheater
The method that sour hydrogen ammonium blocks up ash.
Background technology
According to《Thermal power plant's Air Pollutant Emission》（GB13223-2011）Middle regulation, coal-burning power plant's NOx concentration will execute
100mg/Nm3Emission limit.According to this requirement, most power plant are assembled with selective catalytic reduction（selective
Catalytic reduction, SCR）Denitrification apparatus.The principle of the device is, under the conditions of existing for catalyst and oxygen,
Lower temperature range（280~420℃）It is interior, by reducing agent（Generally ammonia）It sprays into flue gas, it selectively will be in flue gas
NOx reduction generate N2The discharge of NOx is reduced with water.If the ammonia sprayed into is excessive, it will be exported in denitration and generate the escaping of ammonia.
Escape ammonia and SO3It reacts when temperature is relatively low and generates the stronger ammonium hydrogen sulfate of stickiness, be attached to air preheater surface, Yi Yin
Pollution dust stratification is played, air preheater heat exchange element clog risk is increased.
With the proposition of minimum discharge concept, the ammonia slip concentration of coal-burning power plant's denitration outlet often exceeds design value, from
And ammonium hydrogen sulfate is formed in pre- device of unavoidably having leisure, cause air preheater to block serious, differential pressure increases, unit operation risk and at
This increasing.Therefore, the stifled ash of ammonium hydrogen sulfate in online removing coal-burning power plant's air preheater how is effectively realized, to improving unit operation
Stability reduces operating cost and has important practical significance.
Invention content
Technical problem to be solved by the invention is to provide sulfuric acid in a kind of reliable online removing coal-burning power plant's air preheater
The method that hydrogen ammonium blocks up ash, it is efficient to remove ammonium hydrogen sulfate inside air preheater, it reduces and blocks risk.
To solve the above problems, ammonium hydrogen sulfate is stifled in a kind of reliable online removing coal-burning power plant's air preheater of present invention offer
The method of ash, includes the following steps：
（1）In the unit underload period, air preheater Lateral supply machine output 50% ~ 90% to be cleaned is slowly reduced.
（2）Air preheater side air-introduced machine aperture to be cleaned is adjusted, air preheater exhaust gas temperature is made to increase with 0.5 ~ 5 DEG C/min rates
To 170 ~ 200 DEG C, ammonium hydrogen sulfate form is made to change, steam is used in combination uninterruptedly to purge 30 ~ 60min of air preheater.
（3）It is slowly increased air preheater Lateral supply machine to be cleaned to contribute, reduces exhaust gas temperature to 110 ~ 130 DEG C, reduce and rinse
Water influences " quenching " of air preheater element.
（4）Air preheater cold end is rinsed to promote ammonium hydrogen sulfate point with the high pressure buck of 30 ~ 40MPa of pressure, pH value 12 ~ 14
Solution, washing water quantity control is the 0.5% ~ 5% of unilateral exhaust gas volumn, washing time 60min ~ 90min.During flushing, adjust to be cleaned
Air preheater side air-introduced machine aperture, makes air preheater exhaust gas temperature be maintained at 110 ~ 130 DEG C.
（5）Flushing finishes, and restores air preheater and pressure fan to normal operating condition, deashing process terminates.
During on-line cleaning, in order to ensure unit can stable operation, unit load should be and unilateral empty 30% ~ 50%
Pre- device, pressure fan and air-introduced machine should be able to meet unit air and gas system stable operation.Meanwhile other side air preheater and pressure fan are opened
Degree should constantly carry out coordination control, and combustion chamber draft and combustion process is maintained to stablize.
It is using advantageous effect caused by above-mentioned technical proposal：When the stifled ash of air preheater, differential pressure caused by ammonium hydrogen sulfate
When rising condition, it is not necessary to maintenance down processing, can directly carry out on-line rinsing to reduce air preheater differential pressure, greatly reduce through
Ji loss, improves unit operation stability, safety and economy.
Description of the drawings
Fig. 1 is certain coal-fired boiler in power plant typical case's air and gas system schematic diagram.
Specific implementation mode
With reference to specific example, the present invention is described in detail.
Referring to attached drawing 1, the sides on-line rinsing A air preheater, steps are as follows：
（1）When unit load reaches 50%, slowly reduces and wait for pressure fan A outputs 70%.
（2）Air-introduced machine A apertures are adjusted, so that air preheater A exhaust gas temperatures is risen to 190 DEG C with 2 DEG C/min rates, not with steam
Interruption purging air preheater A 60min.
（3）It is slowly increased pressure fan A to contribute, reduces exhaust gas temperature to 120 DEG C.
（4）Air preheater A cold ends are rinsed with the high pressure buck of pressure 35MPa, pH value 12, the sides A exhaust gas volumn is 270t/h, is rinsed
Water is 3t/h, washing time 70min.During flushing, air preheater side air-introduced machine aperture to be cleaned is adjusted, makes air preheater smoke evacuation temperature
Degree is maintained at 120 DEG C.
（5）Flushing finishes, and restores air preheater and pressure fan to normal operating condition, deashing process terminates.
After flushing, air preheater A differential pressures are decreased obviously, and 0.62KPa is down to by 1.43KPa.
The present invention under low loading conditions, by adjusting pressure fan and air-introduced machine aperture, controls air preheater exhaust gas temperature, and one
Aspect promotes ammonium hydrogen sulfate Morphological Transitions using high temperature, is eliminated the effects of the act by steam blowing；On the other hand online high pressure base is utilized
Liquid rinses, and ammonium hydrogen sulfate is promoted to decompose, and is blocked to eliminate.It is practical the result shows that, the present invention can effectively reduce air preheater resistance
Power reduces operating cost and has important practical significance to improving unit operation stability.
Claims (2)
1. a kind of online method for removing the stifled ash of ammonium hydrogen sulfate in coal-burning power plant's air preheater, it is characterised in that include the following steps：
(1) in the unit underload period, air preheater Lateral supply machine output 50%~90% to be cleaned is slowly reduced；
(2) air preheater side air-introduced machine aperture to be cleaned is adjusted, air preheater exhaust gas temperature is made to be risen to 0.5~5 DEG C/min rates
170~200 DEG C, air preheater 30min~60min is uninterruptedly purged with steam；
(3) it is slowly increased air preheater Lateral supply machine to be cleaned to contribute, reduces exhaust gas temperature to 110~130 DEG C；
(4) 30~40MPa of pressure, the high pressure buck of pH value 12~14 is used to rinse air preheater cold end, washing water quantity is controlled in unilateral side
The 0.5%~5% of exhaust gas volumn, washing time 60min~90min；During flushing, adjusts air preheater side to be cleaned air-introduced machine and open
Degree, makes air preheater exhaust gas temperature be maintained at 110~130 DEG C；
(5) it rinses and finishes, restore air preheater and pressure fan to normal operating condition, deashing process terminates.
2. a kind of online method for removing the stifled ash of ammonium hydrogen sulfate in coal-burning power plant's air preheater according to claim 1, special
Sign is：The unit load should be 30%~50%, and unilateral air preheater, pressure fan and air-introduced machine should meet unit air and gas system
Stable operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610582074.XA CN106224989B (en) | 2016-07-22 | 2016-07-22 | A kind of online method for removing the stifled ash of ammonium hydrogen sulfate in coal-burning power plant's air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610582074.XA CN106224989B (en) | 2016-07-22 | 2016-07-22 | A kind of online method for removing the stifled ash of ammonium hydrogen sulfate in coal-burning power plant's air preheater |
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| Publication Number | Publication Date |
|---|---|
| CN106224989A CN106224989A (en) | 2016-12-14 |
| CN106224989B true CN106224989B (en) | 2018-07-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107120675A (en) * | 2017-06-14 | 2017-09-01 | 天津国电津能热电有限公司 | A kind of air and gas system and air preheater cold end control method |
| CN107166425A (en) * | 2017-06-23 | 2017-09-15 | 中国大唐集团科学技术研究院有限公司华东分公司 | It is a kind of to mitigate method and its device that air preheater blocks and improves heat utilization rate |
| CN107420929A (en) * | 2017-06-26 | 2017-12-01 | 安徽亿纵电子科技有限公司 | A kind of air preheater exhaust gas temperature control system |
| CN109210555A (en) * | 2017-07-03 | 2019-01-15 | 大唐保定热电厂 | Station boiler denitration puts into operation the online dry combustion method blockage removal system of air preheater and technology |
| CN108525489B (en) * | 2018-04-10 | 2020-03-17 | 西安交通大学 | Coal-fired power plant flue ammonium bisulfate cleaning device based on eddy heating and gas suction method |
| CN109373340B (en) * | 2018-10-23 | 2020-01-03 | 大唐滨州发电有限公司 | Online high-pressure water washing method for rotary air preheater of full-cloth-bag dust removal type coal-fired boiler |
| CN112902218A (en) * | 2021-01-29 | 2021-06-04 | 浙江浙能兰溪发电有限责任公司 | Differential pressure control method and control device for air pre-heater of coal-fired power plant |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0197023A2 (en) * | 1985-03-25 | 1986-10-08 | Simmering-Graz-Pauker Aktiengesellschaft | Process and device for cleaning gas-gas heat exchangers |
| CN102042605A (en) * | 2011-01-27 | 2011-05-04 | 章礼道 | Side-to-side thermal deashing method for rotary air preheater |
| CN104033921A (en) * | 2014-06-20 | 2014-09-10 | 国家电网公司 | Device and method for preventing ammonium bisulfate from blocking air preheaters of coal-fired boiler |
| CN104180378A (en) * | 2014-07-24 | 2014-12-03 | 国家电网公司 | Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3747299B2 (en) * | 1996-11-06 | 2006-02-22 | バブコック日立株式会社 | Cleaning method of gas gas heater |
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2016
- 2016-07-22 CN CN201610582074.XA patent/CN106224989B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0197023A2 (en) * | 1985-03-25 | 1986-10-08 | Simmering-Graz-Pauker Aktiengesellschaft | Process and device for cleaning gas-gas heat exchangers |
| CN102042605A (en) * | 2011-01-27 | 2011-05-04 | 章礼道 | Side-to-side thermal deashing method for rotary air preheater |
| CN104033921A (en) * | 2014-06-20 | 2014-09-10 | 国家电网公司 | Device and method for preventing ammonium bisulfate from blocking air preheaters of coal-fired boiler |
| CN104180378A (en) * | 2014-07-24 | 2014-12-03 | 国家电网公司 | Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant |
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| CN106224989A (en) | 2016-12-14 |
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