CN105202533A - Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction - Google Patents
Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction Download PDFInfo
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- CN105202533A CN105202533A CN201510709126.0A CN201510709126A CN105202533A CN 105202533 A CN105202533 A CN 105202533A CN 201510709126 A CN201510709126 A CN 201510709126A CN 105202533 A CN105202533 A CN 105202533A
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Abstract
The invention discloses an anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction. The apparatus capable of injecting a plurality of high-air speed low-air quantity jet flows is arranged between a top secondary air nozzle and an over fire air nozzle of a corner-fired boiler. The anti-coking method and apparatus can overcome or greatly alleviate the coking problem of corner areas of the corner-fired boiler and improve economical efficiency and security of the boiler in operation; thus, the anti-coking method and apparatus bring good economic benefits to a thermal power generating unit and has wide popularization significance.
Description
Technical field
The invention belongs to coal-fired boiler combustion field, be specifically related to a kind of eddy current that destroys and stop boiler coke apparatus and method.
Background technology
China is maximum coal production state and country of consumption; coal is occupied an leading position in China's energy resource structure; and this energy resource structure can not change in a short time; therefore thermoelectricity remains main force's power supply of China; guarantee the economical operation of fired power generating unit safety and stability; for meeting national economic development requirement, promote that social economy's sustainable and healthy development is significant.In thermal power unit operation, boiler coke affects unit safety to stabilize the economy the universal phenomenon run, and is also simultaneously long-standing problem.Boiler of power plant is mainly fuel with coal, containing materials such as a large amount of soot particle, sulphur and nitrogen oxides in its combustion product, these materials are in boiler running process, the surface of heating surface can be deposited in a variety of manners, cause the coking of heating surface, boiler heating surface coking not only can reduce the heat-economy of boiler operatiopn, even can affect the safe operation of boiler, also device damage and personal injury accident can occur time serious.
In order to reduce boiler nitrogen oxide emission, the mode that boiler can select the transformation of air classification low nitrogen burning and catalytic denitration (SCR) to combine usually is to realize denitrating flue gas.After the transformation of boiler air classification low nitrogen burning, its main burner region oxygen amount sharply can reduce and causes Boiler Ash fusing point step-down.For Process In A Tangential Firing, be reduction of nitrogen oxide district between burnout degree and main burner, oxygen concentration is very low easily produces coking problem in Ruo Feng district, corner.Boiler four corners due to flue gas ascending air resistance large, and level and vertical direction easily produce vortex, the most easily cause flying dust accumulation and then cause coking.Boiler sootblower is arranged on front and back and the left and right side wall of boiler, and in order to avoid steam jet damage water-cooling wall, soot blower can not cover burner hearth corner.When coking occurs in burner hearth corner, coke button slowly can be piled up between burnout degree and main burner, blocks spout gradually and causes lip jet direction to deflect, finally cause boiler large-area coking, even cause overtemperature tube burst to be forced to blowing out.Corner between the burnout degree and main burner of boiler, soot blower does not cover and does not beat burnt hole, when using the lower coal of ash fusion point, easy formation spout coking from top to bottom, finally because spout coking causes lip jet direction to change aerodynamic field disorder, thus cause boiler large-area coking, boiler shutdown.
Summary of the invention
The technical problem to be solved in the present invention is: for implementing the improved Process In A Tangential Firing of air classification low nitrogen burning, provide a kind of anti-coking method and device, to overcome the deficiencies in the prior art.
Technical scheme of the present invention is: a kind of based on the improved anti-coking method of air classification low nitrogen burning, namely between the superiors' overfire air port and fire air nozzle of tangentially-fired boiler, spray into the low air quantity jet of multiply high wind speed, destroy boiler in the recirculating zone at four angles, thus avoid melting soot particle just to pile up coking on the burner.Described multiple jets comprises transverse jet and longitudinal jet, and wherein transverse jet points to boiler furnace center position, destroys the eddy current that lip jet causes district of local decompression and jet to cause.Longitudinal jet refers to that boiler is along water-cooling wall parallel direction, longitudinal fluidic vectoring thrust one brattice, and stop the soot particle of melting close to water-cooling wall, the eddy current that the air-flow simultaneously destroying rotation is formed in burner hearth burner hearth corner, avoids soot particle to pile up.Jet wind speed range is 25m/s ~ 40m/s, and jet air quantity accounts for 5% ~ 7% of Secondary Air total blast volume
In order to implement above-mentioned anti-coking method, the present invention proposes the improved coking device of a kind of air classification low nitrogen burning, described coking device is arranged between the superiors' overfire air port of Process In A Tangential Firing and fire air nozzle, destroying boiler in the recirculating zone at four angles by spraying into the low air quantity jet of multiply high wind speed, avoiding melting soot particle just to pile up coking on the burner.The spout of this device has horizontal and vertical both direction jet, transverse jet points to boiler furnace center position, the oxygen amount in transverse jet supplement boiler corner, reduces the eddy current that boiler corner has jet to cause, stops not solidified soot particle to stick on burner nozzle.Longitudinal jet is parallel with water-cooling wall along furnace height direction, and together with being formed with main burner region at burnout degree, air curtain barrier intercepts that not solidify soot particle close to water-cooling wall, protects water-cooling wall to prevent water wall high temperature corrosion.This device is different from the structure of main burner and overfire air port, and this spout is made up of multiple aperture (jet orifice), and array arranges, line space, column pitch and hole size, determines according to boiler capacity and the ature of coal used.Boiler corner is the easy coking region of low wind speed, and this device improves to press close to water-cooling wall side oxygen amount and strengthen disturbance simultaneously and abolish the accumulation of soot particle in corner by local jet.
Described array comprises circular square array hole, circular stagger arrangement hole, square array hole, square stagger arrangement hole, and large aperture is staggered in arrangement, and be wherein uniformly distributed type with square hole, narrow slit type square hole is uniformly distributed type, circular port blossom type is distributed as common type.
Technical scheme of the present invention compared with prior art, can realize following effect:
1, destroy by multiple jets the eddy current that the spray circle of contact is rotated in corner formation, thus the jet direction preventing coking near spout from causing changes and stove internally-powered field is disorderly.
2, improve burner hearth corner place's oxidation atmosphere by multiple jets thus improve ash fusion point temperature, avoiding soot particle coking near spout to cause stove internally-powered field disorderly.
3, improved the flow perturbation of nearly water-cooling wall side by jet, remove dust stratification near spout.
4, solve the burner hearth corner coking problem that common soot blower cannot cover, coordinate normal soot blower to use, workman can be reduced and beat burnt workload, avoid producing the coke button not easily observed in corner simultaneously.
5, ensure boiler operatiopn safety, and boiler is changed little, easy construction.
6, improve boiler efficiency, reduce the exhaust gas temperature of burner hearth, protection safe operation of the boiler.
Compared with prior art, the present invention by setting up a kind of coking device on tangentially-fired boiler, can solve or significantly alleviate the coking problem of Process In A Tangential Firing folding corner region, improve performance driving economy and the security of the type boiler, therefore can bring good economic benefit to fired power generating unit, there is the meaning extensively promoted.
Accompanying drawing explanation
Fig. 1 is coking device of the present invention installation site figure in the boiler (in figure, SOFA represents apart arrangement burnout degree);
Fig. 2 is spout front view and the top view square hole of a kind of coking device of the present invention, is uniformly distributed;
Fig. 3 is spout front view and the top view of a kind of coking device of the present invention, and circular port blossom type distributes
Fig. 4 is spout front view and the top view of a kind of coking device of the present invention, and narrow slit type square hole is uniformly distributed.
Detailed description of the invention
In order to make object of the present invention, technical scheme and effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Described coking device is arranged on Process In A Tangential Firing four angles, between burnout degree and main burner, as shown in Figure 1.Fig. 2 and Fig. 3 is the spout schematic diagram of coking device, spout front and above have circular aperture (jet orifice), aperture at 10mm ~ 20mm, corresponding direction, boiler corner, front, top corresponding along furnace height direction and with water-cooling wall parallel direction.This device is connected with secondary air box by airduct, tube connector is equipped with the air door controlling air quantity.This device is concordant with burner, horizontal positioned, and burner hearth center crossed by spout central line.Described device eliminates the accumulation of flying dust in boiler corner by multiple jets, transforms the rear easy coking in corner and design for the low NOx of quadrangle tangential circle.Described device increases the flow perturbation in this region by the oxygen amount of the nearly water-cooling wall side of supplement boiler reduced zone simultaneously, stops soot particle to be piled up in boiler corner.Boiler combustion exhausted wind and primary combustion zone are the reducing zones of nitrogen oxide, and soot particle easily deposits in the corner in this region, and soot blower cannot cover, and solve boiler corner coking problem by this device.
In the present embodiment, jet orifice is arranged on front portion and the top of coking device, and the size and number in hole is not limited to the description in patent figures.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. based on the improved anti-coking method of air classification low nitrogen burning, it is characterized in that: between the superiors' overfire air port and fire air nozzle of tangentially-fired boiler, spray into the low air quantity jet of multiply high wind speed.
2. one according to claim 1 is based on the improved anti-coking method of air classification low nitrogen burning, it is characterized in that: described multiple jets comprises and points to boiler furnace center position, and along furnace height direction and with water-cooling wall parallel direction.
3. one according to claim 1 is based on the improved anti-coking method of air classification low nitrogen burning, it is characterized in that: described jet wind speed range is 25m/s ~ 40m/s.
4. one according to claim 1 is based on the improved anti-coking method of air classification low nitrogen burning, it is characterized in that: described air quantity accounts for 5% ~ 7% of Secondary Air total blast volume.
5. implement the claims a device for method described in 1, it is characterized in that: comprise the spout pointing to boiler furnace center position, and along furnace height direction and with the spout of water-cooling wall parallel direction, described spout comprises multiple aperture, and the arrangement in array.
6. device according to claim 5, is characterized in that: described array comprises circular square array hole, circular stagger arrangement hole, square array hole, square stagger arrangement hole, and large aperture is staggered in arrangement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510709126.0A CN105202533A (en) | 2015-10-28 | 2015-10-28 | Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction |
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| CN201510709126.0A CN105202533A (en) | 2015-10-28 | 2015-10-28 | Anti-coking method and apparatus based on air-staged low-nitrogen combustion reconstruction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107327837A (en) * | 2017-07-24 | 2017-11-07 | 无锡华光锅炉股份有限公司 | The easy coking area of main burner solves coking structure |
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| CN101694295A (en) * | 2009-10-30 | 2010-04-14 | 哈尔滨工业大学 | W-shaped flame boiler disposing aperture type over-fire air spouts on stove arch |
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| CN103216821A (en) * | 2013-04-27 | 2013-07-24 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| CN203980331U (en) * | 2014-07-14 | 2014-12-03 | 东方电气集团东方锅炉股份有限公司 | Prevent the anti-scorch wind system of four jiaos of serious cokings of " W " stove |
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2015
- 2015-10-28 CN CN201510709126.0A patent/CN105202533A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101074775A (en) * | 2007-06-28 | 2007-11-21 | 上海交通大学 | Densed-phase back-flushing split-pole NOx combustion |
| CN101245919A (en) * | 2008-01-17 | 2008-08-20 | 上海交通大学 | Method for controlling considerable coal-fired boiler NOx discharge by multilevel reduction wind |
| CN101694295A (en) * | 2009-10-30 | 2010-04-14 | 哈尔滨工业大学 | W-shaped flame boiler disposing aperture type over-fire air spouts on stove arch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107327837A (en) * | 2017-07-24 | 2017-11-07 | 无锡华光锅炉股份有限公司 | The easy coking area of main burner solves coking structure |
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