CN103528047B - A kind of steam soot blowing for the tower direct current cooker in thermal power plant regulates the method for reheat steam temperature - Google Patents
A kind of steam soot blowing for the tower direct current cooker in thermal power plant regulates the method for reheat steam temperature Download PDFInfo
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- CN103528047B CN103528047B CN201310480255.8A CN201310480255A CN103528047B CN 103528047 B CN103528047 B CN 103528047B CN 201310480255 A CN201310480255 A CN 201310480255A CN 103528047 B CN103528047 B CN 103528047B
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- 238000007664 blowing Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000004071 soot Substances 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 239000000428 dust Substances 0.000 claims abstract description 18
- 238000013517 stratification Methods 0.000 claims description 12
- 238000004939 coking Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000010977 unit operation Methods 0.000 abstract description 7
- 238000013021 overheating Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a kind of method that steam soot blowing for the tower direct current cooker in thermal power plant regulates reheat steam temperature, specifically comprise the following steps: step 1, is incorporated into steam in ash gun; Step 2, utilizes the steam in described ash gun to blow ash to the heating surface of superheater and reheater in tower direct current cooker, to change the superficial dust degree of superheater and reheater; Step 3, judges whether reheater outlet steam temperature reaches predetermined requirement: in step 2, reduce the grey intensity of blowing of superheater surface and/or increase the grey intensity of blowing of reheater heating surface as need promote; In step 2, increase the grey intensity of blowing of superheater surface and/or reduce the grey intensity of blowing of reheater heating surface as need reduce. Reheat steam temperature when the present invention can effectively improve unit operation, improves unit operation economy, and improves unit operation security.
Description
Technical field
The present invention relates to a kind of method that steam soot blowing regulates reheat steam temperature, relate in particular to a kind of for thermal power plantThe steam soot blowing of tower direct current cooker regulates the method for reheat steam temperature.
Background technology
Vapor (steam) temperature is important detection in thermal power plant's production run and controls parameter, and it is too high or too low all can affectThe security of unit operation and economy, thereby the control of main steam temperature and reheat steam temperature is thermal power plant's operationOne of main task. For direct current cooker, because main steam temperature is can be by coal-water ratio and spray desuperheating twoPlant control device and controlled in the reasonable scope, thereby be not that operations staff encounters for the control of main steam temperatureMain bugbear. But for the control of reheat steam temperature, because tower direct current cooker does not arrange gas baffle, forRegulate the exhaust gas volumn between superheater and reheater to distribute, once use up in limited means such as burner pivot angle adjustingsAfter, there is still situation on the low side of reheat steam temperature, operations staff often just can only listen its it.
Reheat steam temperature when the at present tower direct current cooker operation of super (super-) critical, more appearance 10 DEG C on the low side-20 DEG C of even more situations. In theory, 10 DEG C of the every reductions of reheat steam temperature, gross coal consumption rate approximately raise nearly 0.8 gram/Kilowatt hour, therefore, the maintenance of reheat steam temperature is to unit operation efficiency important.
The reheat steam temperature control method of the tower direct current cooker of tradition mainly comprises adjusts desuperheating water, burner pivot angle tuneJoint, coal-supplying amount trapezoidal profile and total blast volume adjusting etc. Above-mentioned regulating measure has necessarily the adjusting of reheat steam temperatureEffect, but in actual steam temperature adjustment process, limited by objective factor, above-mentioned regulating measure exists followingNot enough:
(1) in reheat steam temperature regulates, desuperheating water can only play desuperheat effect as emergency spray, reheater desuperheatWhen water running, can cause in steam turbine, low pressure (LP) cylinder steam flow increases, in corresponding having increased, the power of low pressure (LP) cylinder,This is just equivalent to increase in one and pressed (Rankine) circulation in the ultra supercritical reheat vapor cycle of unit, causes whole machineGroup economy declines;
(2) burner pivot angle regulates the method for steam temperature, is the position by adjusting furnace flame center, thereby changesBecome reheat steam temperature, but if excessive because improving reheat steam temperature amplitude that pivot angle is adjusted upward, burner easily goes outExisting accelerated wear test is even burnt, and be unfavorable for the safe operation of equipment, and flame kernel is too high, and coal dust is in stoveThe time of staying is too short, causes unburned carbon in flue dust to rise, and reduces boiler efficiency, and in addition, the amplitude that the method is adjusted alsoBe limited, some boilers even adjust upward extremely and prescribe a time limit at burner pivot angle, and reheat steam temperature is still on the low side;
(3) coal-supplying amount trapezoidal profile is also equivalent to adjust furnace flame center, can exist boiler combustion equallyImpact, causes unburned carbon in flue dust to rise, and in addition, load and upper strata coal pulverizer when the method is also limited to operation go outPower, regulating measure and amplitude are all limited;
(4) total blast volume regulates and refers to the heat absorption that changes convection heating surface by changing air quantity, thereby finally changesVapor (steam) temperature. The method can be used for the adjusting of reheat steam temperature, increases air quantity, can make reheated steam heating surface cigarette speed increaseGreatly, heat convection is strengthened, and reheat steam temperature rises, and its shortcoming is to have increased boiler exhaust gas loss and blower fan power consumption,Thereby affect the economy of unit.
For Π type boiler, owing to existing flue gas temperature-adjusting baffle in boiler back end ductwork, by regulating this baffle platePosition can reach and change the flue gas flow of superheater and reheater of flowing through, thereby reach the order of adjusting reheat steam temperature. Thereby for Π type boiler, reheat steam temperature can be adjusted to design load in principle. But tower boilerIn this baffle plate not, often in the actual motion of tower boiler, above-mentioned control method still can not be by again after using upVapours temperature is heightened to design load. Once there is this situation, operations staff is on the low side just incompetent to reheat steam temperatureFor power.
Blow ash as the routine operation in unit operation, Main Function is to remove fouling of heating surface and coking, keeps being subject toThe cleannes of hot side, improve boiler heat-transfer efficiency, reduce flue circulating resistance and prevent boiler Jiao of collapsing, and guarantee potStove security of operation. Generally, in the situation that load is identical, is accompanied by heating surface and occurs dust stratification or slagging scorification, its system of conducting heatNumber progressively reduces, the also corresponding reduction of heating surface caloric receptivity. Often when desuperheating water of superheater is received to losing without regulating leewayGo after effect, because heating surface temperature reduces, steam temperature starts to decline. The suction that can recover heating surface by blowing ashHeat energy power, improves boiler efficiency, and progressively promotes Temperature of Working, recovers specified steam temperature level.
The steam soot blowing mode that power plant adopts is at present generally that ash is blown in timing, has arrived operation sometime every dayPersonnel will carry out and blow ash manipulation, and to boiler heating surface, ash is blown in unification. Burner hearth is blown to ash and can cause furnace water coolingAfter wall is blown off, its caloric receptivity increases, and causes the overheating steam temperature and the reheater steam temperature that are distributed in below to reduce. To flueIn do not exist the boiler of gas baffle, the heat that flue gas discharges in flue is mainly by superheater and reheaterAbsorb. When superheater is blown after ash, its heat absorption efficiency improves the caloric receptivity increase that causes it, causes reheater heat absorptionAmount reduces, and causes reheat steam temperature to decline; When reheater is blown after ash, its heat absorption efficiency improves the caloric receptivity that causes itIncrease, cause follow-up superheater caloric receptivity to reduce, cause overheating steam temperature to decline. But, for main steam temperature andSpeech, generally can be adjusted to rated value by adjusting coal-water ratio, but for reheat steam temperature, often lacksFew crucial regulating measure.
In addition, because many power plant include main steam temperature and reheat steam temperature in examination scope, operation peopleMember has been increased and has blown grey number of times for fear of examining. Can cause like this and consume boiler sootblowing steam too much and cause unitEconomy reduces, and frequently blows ash and also easily causes heating surface blow loss and cause unit outage accident simultaneously.
Therefore, those skilled in the art is devoted to develop one and can carries out district for overheating steam temperature and reheat steam temperatureDivide the side of the adjusting of the steam soot blowing for the tower direct current cooker in the thermal power plant reheat steam temperature that regulates, saves the energyMethod.
Summary of the invention
Because the above-mentioned defect of prior art, the object of the invention is to provide one can be for overheating steam temperature and hot againSteam temperature is distinguished adjusting, is saved the adjusting of the steam soot blowing for the tower direct current cooker in the thermal power plant heat again of the energyThe method of steam temperature.
For achieving the above object, the invention provides a kind of steam soot blowing for the tower direct current cooker in thermal power plantThe method that regulates reheat steam temperature, is characterized in that, comprises the following steps:
Step 1, under the normal condition of tower direct current cooker hearth combustion, is incorporated into steam in ash gun;
Step 2, utilizes the steam in ash gun, and the heating surface of superheater and reheater in tower direct current cooker is dividedDo not blow ash, to change the superficial dust degree of superheater and reheater;
Step 3, judges whether reheater outlet steam temperature reaches predetermined requirement: in step 2, subtract as need promoteLittle to the grey intensity of blowing of superheater surface and/or increase to the grey intensity of blowing of reheater heating surface; As need reduceIn step 2, increase the grey intensity of blowing of superheater surface and/or reduce the grey intensity of blowing of reheater heating surface.
In step 3, judge whether reheater outlet steam temperature reaches predetermined requirement: increase hot again as need promoteDevice heating surface blow grey intensity, reduce the grey intensity of blowing of reheater heating surface as need reduce; Or, as need are carriedRise and reduce the grey intensity of blowing of superheater surface, as need, reduction increases blowing of superheater surface grey strongDegree; Or, increase the grey intensity of blowing of reheater heating surface simultaneously and reduce superheater surface as need promoteBlow grey intensity, as need reduce to reduce the grey intensity of blowing of reheater heating surface and increase simultaneously, superheater is heatedFace blow grey intensity.
In preferred embodiments of the present invention, in step 3, reduce or increase the method for blowing grey intensity for reducing or increasingAdd and blow the grey frequency.
In another preferred embodiments of the present invention, in step 3, reduce or increase the method for blowing grey intensity for reducingOr steam pressure in increase ash gun.
In another preferred embodiments of the present invention, also comprise step 4:
Step 4, whether the coking, dust stratification degree that judge superheater or reheater be within preset range, and in stepIn rapid 2, reduce or increase to blow grey intensity, control coking, the dust stratification degree of superheater or reheater, make it in advanceWithin determining scope.
The present invention, by overheating steam temperature and reheat steam temperature are distinguished to adjustment, has obtained beneficial effect:
1: by having object control and suitably reducing superheater and blow grey intensity, to change superheater surface dust stratification journeyDegree, reduces its caloric receptivity thereby reduce its effective heat transfer area, and reheater caloric receptivity is improved, and realizesThe lifting of reheat steam temperature, and then the economy of raising unit operation;
2: distinguish to regulate for overheating steam temperature and reheat steam temperature and can significantly reduce overheating steam temperature and reheat steam temperatureFluctuating range, the impact of the alternate stress that the metal pipe material that alleviates heating surface produces because of the temperature difference, has greatly improved and has establishedStandby security;
3: reduce the steam consumption loss producing because blindly blowing ash manipulation, improved operational efficiency;
4: by real-time adjustment variations in temperature, reduced and blown ash manipulation, reduced heating surface and produced because excessively blowing ashThe probability of blow loss, further lifting means security.
To the technique effect of design of the present invention, concrete steps and generation be described further below, with fullyUnderstand object of the present invention, feature and effect.
Detailed description of the invention
The steam soot blowing that the invention provides a kind of tower direct current cooker for thermal power plant regulates reheat steam temperatureMethod, specifically comprise the following steps:
Step 1, under the normal condition of tower direct current cooker hearth combustion, is incorporated into steam in ash gun;
Step 2, utilizes the steam in described ash gun, to being heated of superheater and reheater in tower direct current cookerFace blows ash, to change the superficial dust degree of superheater and reheater;
Step 3, judges whether reheater outlet steam temperature reaches predetermined requirement: in step 2, subtract as need promoteLittle to the grey intensity of blowing of superheater surface and/or increase to the grey intensity of blowing of reheater heating surface; As need reduceIn step 2, increase the grey intensity of blowing of superheater surface and/or reduce the grey intensity of blowing of reheater heating surface.
The vapor (steam) temperature of the outlet of superheater, reheater is mainly determined by following factor: the one, and inlet flue gasTemperature, the 2nd, the coefficient of heat transfer, the 3rd, heat exchange area. The heat exchange area of operating boiler various piece is constant, thisFactor is excluded. In the time that inlet steam is temperature-resistant, entrance flue gas temperature is high, and heat transfer temperature difference is large, and heat exchange amount increases,Its outlet steam temperature increases; Temperature-resistant when inlet steam, heating surface generation dust stratification, causes heating surface heat exchange systemNumber reduces, and heat exchange amount reduces, and its outlet steam temperature reduces. In the time that fouling of heating surface is blown down, heating surface heat exchangeCoefficient increases, and heat exchange amount increases, and outlet steam temperature can increase.
In the time that needs improve reheat steam temperature, reduce the grey intensity of blowing of superheater surface, this is equivalent to increaseThe superficial dust degree of superheater, make superheater caloric receptivity reduce, be arranged in thereafter thereby increased to flow throughThe inlet temperature of flue gas of reheater, the caloric receptivity of having realized reheater increases, and realizes the raising of reheat steam temperature;Or, increase the grey intensity of blowing of reheater heating surface, reduce the dust stratification degree of reheater, increase reheaterThe coefficient of heat transfer, thus the caloric receptivity of increase reheater finally improves reheat steam temperature; Or will reduce superheater surfaceBlow grey intensity and increase reheater heating surface blow these the two kinds of mode combinations of grey intensity, finally improve reheat steam temperature.
In the time that needs reduce reheat steam temperature, increase the grey intensity of blowing of superheater surface, reduce the table of superheaterArea ash degree, increase the caloric receptivity of superheater, is arranged in the flue gas of reheater thereafter thereby reduced to flow throughInlet temperature, has realized the caloric receptivity that has reduced reheater indirectly, thereby realizes the reduction of reheat steam temperature; Or,By reducing the grey intensity of blowing of reheater heating surface, increase the superficial dust degree of reheater heating surface, reduceThereby reheater caloric receptivity reduce reheat steam temperature; Or blow grey intensity and minimizing by what increase superheater surfaceReheater heating surface blow these the two kinds of mode combinations of grey intensity, finally reduce reheat steam temperature.
Superheater and reheater are made to the as a whole steam blowing technique of adjusting compare with traditional, thisInvention is distinguished adjustment for heating surface heat absorption situations at different levels, effectively controls superheater surface and blows grey intensity and againThe hot device top blast ash intensity of being heated, can ensure the surface cleanness of superheater and reheater in the reasonable scope, ensuresSafety and the efficiency of boiler, again meet overheating steam temperature require under prerequisite, promoted reheat steam temperature; Both met portionThe requirement of sub-unit high-temperature, can avoid again the impaired danger of miscellaneous part high temperature; Realize the efficient utilization of resource,Improve the economy of unit.
Meanwhile, the present invention, in realizing reheat steam temperature raising, can reduce and blow ash manipulation to a certain extent, fallsLow heating surface produces the probability of blow loss, further lifting means security because excessively blowing ash. And be subject to by controlHot side dust stratification area coverage, accurately controls the heat absorption between heating surface and between tube panel thereby realize, and occurs being subject to avoidingHot side hot-spot, guarantees device security. In addition,, by adjusting, can reduce the metal temperature of each heating surfaceFluctuating range, alleviates the impact of metal pipe material because of the alternate stress of temperature difference generation.
In preferred embodiment of the present invention, in step 3, reduce or increase the method for blowing grey intensity for reducing or increasingBlow the grey frequency.
In preferred embodiment of the present invention, in step 3, reduce or increase the method for blowing grey intensity for reducing or increasingThe pressure of steam in ash gun.
In preferred embodiment of the present invention, in the method for adjusting reheat steam temperature of the present invention, also can comprise step 4:
Step 4, whether the coking, dust stratification degree that judge superheater or reheater be within preset range, and in stepIn rapid 2, reduce or increase to blow grey intensity, control coking, the dust stratification degree of superheater or reheater, make it in advanceWithin determining scope.
For improve or reduce reheat steam temperature reduce to heating surface blow grey intensity time, need guarantee this heating surface knotJiao, dust stratification situation, within preset range, come off and affect unit safety operation to prevent large area coke button.Certainly, in other embodiments, this step also can be set, the present invention does not limit this.
In another preferred embodiments of the present invention, the quantity of ash gun is one, and the quantity of ash gun also canFor many.
More than describe preferred embodiment of the present invention in detail. Should be appreciated that the ordinary skill of this areaJust can design according to the present invention make many modifications and variations without creative work. Therefore, all skillIn art field technical staff under this invention's idea on the basis of existing technology by logic analysis, reasoning orThe limited experiment of person is available, all in protection domain of the present invention.
Claims (5)
1. regulate a method for reheat steam temperature for the steam soot blowing of the tower direct current cooker in thermal power plant, its spyLevy and be, comprise the following steps:
Step 1, under the normal condition of described tower direct current cooker hearth combustion, is incorporated into described steam to blow ashIn rifle;
Step 2, utilizes the described steam in described ash gun, to superheater in described tower direct current cooker and hot againThe heating surface of device blows respectively ash, to change the superficial dust journey of heating surface of described superheater and described reheaterDegree;
Step 3, judges whether described reheater outlet steam temperature reaches predetermined requirement: promote as needed, in stepIn 2, reduce the grey intensity of blowing of described superheater surface and/or increase blowing of described reheater heating surface grey strongDegree; Reduce as needed, in step 2, increase the grey intensity of blowing of described superheater surface and/or reduce instituteState the grey intensity of blowing of reheater heating surface.
2. the steam soot blowing for the tower direct current cooker in thermal power plant as claimed in claim 1 regulates hot vapour againThe method of temperature, wherein reduces in step 3 or increases the method for blowing grey intensity for reducing or the grey frequency is blown in increase.
3. the steam soot blowing for the tower direct current cooker in thermal power plant as claimed in claim 1 regulates hot vapour againThe method of temperature, wherein reduces in step 3 or increases the method for blowing grey intensity for reducing or increase institute in described ash gunState the pressure of steam.
4. the steam soot blowing for the tower direct current cooker in thermal power plant as claimed in claim 1 regulates hot vapour againThe method of temperature, wherein also comprises step 4:
Step 4, the coking, dust stratification degree that judge described superheater or described reheater whether within preset range,And in step 2, reduce or increase to blow grey intensity, control coking, the dust stratification journey of described superheater or described reheaterDegree, makes it within described preset range.
5. the steam soot blowing for the tower direct current cooker in thermal power plant as claimed in claim 1 regulates hot vapour againThe method of temperature, the quantity of wherein said ash gun is at least one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310480255.8A CN103528047B (en) | 2013-10-15 | 2013-10-15 | A kind of steam soot blowing for the tower direct current cooker in thermal power plant regulates the method for reheat steam temperature |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310480255.8A CN103528047B (en) | 2013-10-15 | 2013-10-15 | A kind of steam soot blowing for the tower direct current cooker in thermal power plant regulates the method for reheat steam temperature |
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| CN103528047A CN103528047A (en) | 2014-01-22 |
| CN103528047B true CN103528047B (en) | 2016-05-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113790436B (en) * | 2020-12-07 | 2022-04-19 | 江苏南通发电有限公司 | 1000MW unit tower type boiler adopting method for increasing reheat steam temperature |
| CN112664965B (en) * | 2020-12-16 | 2022-04-19 | 苏州西热节能环保技术有限公司 | Coal-fired boiler soot blowing operation optimization method based on experimental quantitative analysis |
| CN114110635A (en) * | 2021-10-14 | 2022-03-01 | 国能铜陵发电有限公司 | Control method and device of soot blowing system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338892A (en) * | 2008-06-25 | 2009-01-07 | 中国电力科学研究院 | Thermal power unit reheated steam temperature control method |
| CN102230614A (en) * | 2011-04-07 | 2011-11-02 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| CN102506438A (en) * | 2011-11-06 | 2012-06-20 | 浙江国华浙能发电有限公司 | Variable-stroke soot blowing method for reducing reheat steam temperature deviation of fossil power plant |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338892A (en) * | 2008-06-25 | 2009-01-07 | 中国电力科学研究院 | Thermal power unit reheated steam temperature control method |
| CN102230614A (en) * | 2011-04-07 | 2011-11-02 | 上海锅炉厂有限公司 | Tower boiler with separated flues and adjustable flow |
| CN102506438A (en) * | 2011-11-06 | 2012-06-20 | 浙江国华浙能发电有限公司 | Variable-stroke soot blowing method for reducing reheat steam temperature deviation of fossil power plant |
Non-Patent Citations (1)
| Title |
|---|
| 1000MW塔式锅炉再热汽温偏低原因分析和试验研究;罗韶辉等;《神华科技》;20120731;第10卷(第4期);61-63 * |
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