CN109578992B - Method for adjusting two-side deviation of reheated steam temperature of four-corner tangential firing boiler by SOFA air door - Google Patents
Method for adjusting two-side deviation of reheated steam temperature of four-corner tangential firing boiler by SOFA air door Download PDFInfo
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- CN109578992B CN109578992B CN201811242611.1A CN201811242611A CN109578992B CN 109578992 B CN109578992 B CN 109578992B CN 201811242611 A CN201811242611 A CN 201811242611A CN 109578992 B CN109578992 B CN 109578992B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
Abstract
The invention relates to a method for adjusting the deviation of two sides of the reheated steam temperature of a four-corner tangential firing boiler by a SOFA air door, which comprises the following steps: adjusting the horizontal swing angle of the SOFA air door: when the deviation of the two sides of the reheated steam temperature is eliminated, the vertical swing angle of the SOFA air door is not adjusted; when the deviation of the two sides of the reheated steam temperature is not eliminated, adjusting the vertical swing angle of the SOFA air door; when the vertical swing angle of the SOFA air door is adjusted: the vertical swing angles of the second SOFA air door and the third SOFA air door are adjusted to be inclined upwards, and then the vertical swing angles of the first SOFA air door and the fourth SOFA air door are adjusted to be horizontal. The invention utilizes the cooperative coordination of the horizontal swing angle and the vertical swing angle of the SOFA air door to realize the adjustment of the reheated steam temperature and the desuperheating water amount, rapidly reduces the temperature deviation of the flue gas at two sides of the four-corner tangential firing boiler through the asynchronous adjustment of the horizontal swing angle and the vertical swing angle, reduces the high temperature point of the tube wall of the reheater, solves the problems of large steam temperature deviation at the outlet of the reheater and unbalanced desuperheating water amount at two sides, finally improves the average steam temperature at the outlet of the reheater, and reduces the desuperheating water amount of the reheater.
Description
Technical Field
The invention relates to the field of combustion optimization and safe and economic operation of coal-fired power plants, in particular to a method for adjusting the deviation of two sides of the reheated steam temperature of a four-corner tangential firing boiler by using a SOFA air door.
Background
By the end of 2017, the installed capacity of electricity generation in China is about 17.7 hundred million kilowatts, wherein the installed capacity of coal electricity is about 10.1 hundred million kilowatts, and the unit capacity of more than 30 million kilowatts accounts for more than 80 percent. The three main machines of the coal-electric machine set comprise a boiler, a steam turbine and a generator, the coal-fired boiler of the power station can be generally divided into a pulverized coal boiler and a circulating fluidized bed boiler, and the pulverized coal boiler generally adopts a combustion mode that four corners of a direct-current combustor are arranged to form a tangential-circle combustion mode, a front wall and a rear wall of a cyclone combustor are arranged to form an opposite-impact combustion mode and a W-shaped flame combustion mode. An n-type boiler with tangential firing at four corners is a widely used boiler type.
For an n-shaped boiler with tangential firing at four corners, the section of a hearth is a rectangle close to a square, burner nozzles are usually arranged at the four corners of the hearth, the center line of the outlet of each nozzle deflects a smaller included angle with the diagonal line of the hearth, and the center line of each nozzle is tangent to a smaller circumference of the center of the hearth to obtain a named tangential circle. The four corners efflux jets into the stove simultaneously, receives the efflux promotion separately to the water-cooling wall deflect, forms rotatory tangent circle, and tangent circle direction of rotation is the anticlockwise direction from top to bottom, and the remaining rotation can cause the phenomenon of high left low in boiler furnace export flue gas temperature, boiler export flue gas temperature deviation phenomenon promptly.
The residual rotation of the flue gas in the hearth causes great deviation of the flue gas velocity and the flue gas temperature at the outlet of the hearth and the left and right sides of the horizontal flue, and causes the problems of local overtemperature, great deviation of the steam temperature at the left and right sides, great deviation of the temperature reduction water consumption and the like of the pipe wall of the superheater/reheater. The smoke temperature deviation harms a lot, and can influence the safe and economic operation of the boiler in serious cases, causing the aggravation of high-temperature corrosion and the overtemperature pipe explosion of superheaters and reheaters. The prior operating experience shows that: the existing pi-type boiler with four-corner tangential combustion in active service generally has the technical problem of large smoke temperature deviation, and the safe and economic operation of a unit is seriously influenced, so that the problem has attracted close attention of technicians.
Aiming at the technical problems, in order to eliminate residual rotation, a plurality of groups of SOFA air doors are additionally arranged at four corners of a hearth above a main burner of a newly-built supercritical unit, the rotating direction of the SOFA air doors is opposite to that of an original direct-current burner and used for offsetting the residual rotation at the outlet of the hearth so as to achieve the aim of improving the temperature deviation of a flue gas outlet, meanwhile, the SOFA air can strengthen the grading air distribution effect and reduce the NOx emission, and the SOFA air door adding technology is also commonly applied to the improvement of a low-nitrogen burner of a service boiler.
However, in actual operation, the conventional adjustment mode of the SOFA damper by the power plant still stays in the function of reducing NOx, and secondary air grading air distribution is realized by adjusting the opening of the damper. Although SOFA air door design originally aims at alleviating residual rotation by adjusting the horizontal pivot angle backstepping technology, the smoke temperature deviation on two sides of the boiler cannot be effectively eliminated by adjusting the horizontal pivot angle backstepping technology in actual operation. When the local overtemperature of the pipe wall of the reheater in actual operation, a common power plant remedies the unbalance of the desuperheating water quantity of the reheater, or the economic operation of a unit is influenced by reducing the temperature of the reheated steam.
Disclosure of Invention
The invention aims to provide a method for adjusting the deviation of two sides of the reheated steam temperature of a four-corner tangential firing boiler by a SOFA air door, which is suitable for a pi-shaped boiler with four-corner tangential firing.
In order to achieve the purpose, the invention adopts the technical scheme that:
the method for adjusting the deviation of two sides of the reheated steam temperature of the four-corner tangential firing boiler by the SOFA air doors comprises a first SOFA air door, a second SOFA air door, a third SOFA air door and a fourth SOFA air door which are positioned at four corners of the four-corner tangential firing boiler, wherein the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are distributed along the anticlockwise direction of the cross section of the hearth of the four-corner tangential firing boiler, and comprises the following steps:
(1) adjusting the horizontal swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door: when the deviation of the two sides of the reheated steam temperature is eliminated, the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are not adjusted; when the deviation of the two sides of the reheated steam temperature is not eliminated, the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted;
(2) adjusting the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door: and adjusting the vertical swing angles of the second SOFA air door and the third SOFA air door to be inclined upwards, and adjusting the vertical swing angles of the first SOFA air door and the fourth SOFA air door to be horizontal.
On-site practice finds that smoke temperature deviation on two sides of a boiler can be further improved by asynchronously adjusting the vertical swing angle, and a design concept and a design case for eliminating residual smoke rotation and smoke temperature deviation through asynchronous adjustment of the vertical swing angle of the SOFA air door are not found in existing researches.
Preferably, when the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted, the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted first, and then the vertical swing angles of the first SOFA air door and the fourth SOFA air door are adjusted to be horizontal.
Further preferably, when the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted, the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted to the same angle, and then the vertical swing angles of the second SOFA air door and the third SOFA air door are adjusted to be inclined upwards.
Further preferably, the adjustment angles of the vertical pivot angles of the first SOFA damper, the second SOFA damper, the third SOFA damper and the fourth SOFA damper are 20 degrees of downward inclination to 24 degrees of upward inclination.
Preferably, the swing angles of the second SOFA damper and the third SOFA damper are adjusted to be 12-24 degrees of upward inclination.
Preferably, the horizontal swing angle of the SOFA air door is reverse cut minus 10 degrees to minus 20 degrees.
Further preferably, the horizontal swing angle of the SOFA damper is-15 ° of reverse cut.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages and effects:
the invention utilizes the cooperative coordination of the horizontal swing angle and the vertical swing angle of the SOFA air door to realize the adjustment of the reheated steam temperature and the desuperheating water amount, rapidly reduces the temperature deviation of the flue gas at two sides of the four-corner tangential firing boiler through the asynchronous adjustment of the horizontal swing angle and the vertical swing angle, reduces the high temperature point of the tube wall of the reheater, solves the problems of large steam temperature deviation at the outlet of the reheater and unbalanced desuperheating water amount at two sides, finally improves the average steam temperature at the outlet of the reheater, and reduces the desuperheating water amount of the reheater.
Drawings
FIG. 1 is a schematic diagram of the position of the SOFA damper (in the direction facing the chimney) in this embodiment.
Detailed Description
The invention is further described below with reference to the accompanying drawings and embodiments:
taking a certain power plant as an example, a method for adjusting the deviation of two sides of the reheated steam temperature of an n-shaped boiler with four-corner tangential firing through a SOFA air door is described as follows:
the SOFA air doors are composed of a first SOFA air door 1, a second SOFA air door 2, a third SOFA air door 3 and a fourth SOFA air door 4 which are positioned at four corners of the boiler, and the first SOFA air door 1, the second SOFA air door 2, the third SOFA air door 3 and the fourth SOFA air door 4 are distributed along the anticlockwise direction of the cross section of the hearth of the four-corner tangential firing boiler, as shown in FIG. 1: the first SOFA damper 1 is located below the second SOFA damper 2, the third SOFA damper 3 is located to the right of the second SOFA damper 2, and the fourth SOFA damper 4 is located below the third SOFA damper 3 and to the right of the first SOFA damper 1.
Firstly, finishing basic work, including local and remote comparison of the opening degree and the rotation direction of the SOFA air doors, ensuring the scale correspondence, under the working condition of 100 percent rated load, adjusting the horizontal swing angles of the first SOFA air door 1, the second SOFA air door 2, the third SOFA air door 3 and the fourth SOFA air door 4 to be inverse tangent-15 degrees (inverse tangent is opposite to the rotation circle-cutting direction of the main burner), then adjusting the vertical swing angles of the first SOFA air door 1, the second SOFA air door 2, the third SOFA air door 3 and the fourth SOFA air door 4 to be 20 degrees of declination (-20 ℃), and at the moment: the test result shows that the average value of the outlet steam temperature of the reheater at the side A is 598.1 ℃, the average value of the outlet steam temperature of the reheater at the side B is 594.1 ℃, the reheating and temperature-reducing water flow at the side A is 2.06t/h, and the reheating and temperature-reducing water flow at the side B is 14.94 t/h.
Then keeping the horizontal pivot angles of the first SOFA air door 1, the second SOFA air door 2, the third SOFA air door 3 and the fourth SOFA air door 4 unchanged, adjusting the vertical pivot angles of the second SOFA air door 2 and the third SOFA air door 3 to 24 degrees of upward inclination, further relieving the left-right deviation of the outlet steam temperature of the reheater, and finally adjusting the first SOFA air door 1 and the fourth SOFA air door 4 to be horizontal, namely 0 degrees, at the moment: the experimental result shows that the average value of the outlet steam temperature of the reheater at the side A is 600.1 ℃, the average value of the outlet steam temperature of the reheater at the side B is 599.2 ℃, the reheating and temperature-reducing water flow at the side A is 1.84t/h, and the reheating and temperature-reducing water flow at the side B is 6.74 t/h.
After adjustment, the left and right deviation of the outlet steam temperature of the reheater meets the design requirement, the average value of the outlet steam temperature of the reheater is improved by 5.1 ℃, and the left and right deviation of the amount of the reheater reduced temperature water is reduced by about 10.00 t/h.
According to the method for adjusting the deviation of two sides of the reheated steam temperature of the Pi-shaped boiler with the four-corner tangential combustion through the SOFA air door, the deviation of the left and right reheater outlet steam temperature can be adjusted rapidly, and a beneficial reference is provided for adjustment of the deviation of the reheater outlet steam temperature of the power plant of the same type.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (6)
1. The utility model provides a method of SOFA air door regulation four corners tangential firing boiler reheat steam temperature both sides deviation, the SOFA air door by be located four corners of four corners tangential firing boiler on first SOFA air door, second SOFA air door, third SOFA air door and fourth SOFA air door constitute, just first SOFA air door, second SOFA air door, third SOFA air door and fourth SOFA air door along the four corners tangential firing boiler furnace cross-section anticlockwise direction distribute, its characterized in that: the method comprises the following steps:
(1) adjusting horizontal pivot angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door, wherein the horizontal pivot angles are inverse tangent angles ranging from-10 degrees to-20 degrees, and when deviations of two sides of reheated steam temperature are eliminated, vertical pivot angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are not adjusted; when the deviation of the two sides of the reheated steam temperature is not eliminated, the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted;
(2) adjusting the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door: and adjusting the vertical swing angles of the second SOFA air door and the third SOFA air door to be inclined upwards, and adjusting the vertical swing angles of the first SOFA air door and the fourth SOFA air door to be horizontal.
2. The method for adjusting the two-side deviation of the reheat steam temperature of a four-corner tangential firing boiler through SOFA dampers according to claim 1, wherein the method comprises the following steps: when the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted, and then the vertical swing angles of the first SOFA air door and the fourth SOFA air door are adjusted to be horizontal.
3. The method for adjusting the two-side deviation of the reheat steam temperature of a four-corner tangential firing boiler through SOFA dampers as claimed in claim 2, wherein: when the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted, the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are adjusted to the same angle, and then the vertical swing angles of the second SOFA air door and the third SOFA air door are adjusted to be inclined upwards.
4. The method of SOFA damper adjusting double-side deviation of reheat steam temperature of a four corner tangential firing boiler according to claim 3, wherein: the adjusting angles of the vertical swing angles of the first SOFA air door, the second SOFA air door, the third SOFA air door and the fourth SOFA air door are 20 degrees of declining to 24 degrees of rising.
5. The method for adjusting the two-side deviation of the reheat steam temperature of a quadrangle tangential firing boiler by SOFA dampers as claimed in claim 1 or 3, wherein: and the swing angles of the second SOFA air door and the third SOFA air door are adjusted to 12-24 degrees of upward inclination.
6. The method for adjusting the two-side deviation of the reheat steam temperature of a four-corner tangential firing boiler through SOFA dampers according to claim 1, wherein the method comprises the following steps: the horizontal swing angle of the SOFA air door is reverse cut-15 degrees.
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| CN110805889A (en) * | 2019-09-30 | 2020-02-18 | 杭州亿炉科技有限公司 | Combustion adjusting method for reducing left-right deviation of boiler hearth outlet under AGC operation |
| CN113958948B (en) * | 2021-11-25 | 2022-08-26 | 哈尔滨工业大学 | W flame boiler suitable for wide coal combustion and combustion method thereof |
| CN114932019B (en) * | 2022-07-25 | 2022-11-01 | 中国空气动力研究与发展中心低速空气动力研究所 | Method for controlling expansion angle of rectangular jet flow |
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| US7624707B2 (en) * | 2004-01-29 | 2009-12-01 | Babcock & Wilcox Power Generation Group, Inc. | Re-oriented over fire air ports for reduction of NOx production from pulverized coal-fired burners |
| US7865271B2 (en) * | 2006-11-02 | 2011-01-04 | General Electric Company | Methods and systems to increase efficiency and reduce fouling in coal-fired power plants |
| CN102297422B (en) * | 2011-09-21 | 2013-04-17 | 北京博惠通科技发展有限公司 | Burn-out wind combustion device and method with low NOx emission |
| CN102384468A (en) * | 2011-11-18 | 2012-03-21 | 哈尔滨锅炉厂有限责任公司 | Separating over-fired air (SOFA) brown coal combustor and combustion method |
| CN202350012U (en) * | 2011-11-22 | 2012-07-25 | 中国科学院过程工程研究所 | Multi-angular tangential circle multi-scale coal dust decoupling combustion device |
| CN103968412B (en) * | 2014-03-28 | 2016-02-24 | 广东电网公司电力科学研究院 | The acquisition methods of combustion characteristics under different CCOFA wind and SOFA wind ratio after boiler improvement |
| CN104197314B (en) * | 2014-08-05 | 2016-02-24 | 广东省粤电集团有限公司珠海发电厂 | Process In A Tangential Firing method for controlling combustion |
| CN104595889B (en) * | 2015-01-21 | 2017-02-22 | 华能国际电力股份有限公司 | System and method for eliminating operation oxygen deviation at two sides of tangential firing boiler |
| CN105114944B (en) * | 2015-09-17 | 2018-02-16 | 西安西热锅炉环保工程有限公司 | A kind of tangential boiler Researched of Air Staging Combustion Burning Pulverized Coal vertical-horizontal combination arrangement after-flame wind system |
| CN107246604B (en) * | 2017-07-27 | 2023-10-17 | 华北电力科学研究院有限责任公司 | Method and system for adjusting reheat steam temperature of boiler |
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