CN104713064A - Combustion adjustment method for supercritical boiler capable of performing blending combustion of coke oven gas - Google Patents
Combustion adjustment method for supercritical boiler capable of performing blending combustion of coke oven gas Download PDFInfo
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- CN104713064A CN104713064A CN201510144959.7A CN201510144959A CN104713064A CN 104713064 A CN104713064 A CN 104713064A CN 201510144959 A CN201510144959 A CN 201510144959A CN 104713064 A CN104713064 A CN 104713064A
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Abstract
The invention discloses a combustion adjustment method for a supercritical boiler capable of performing blending combustion of coke oven gas. The device comprises a supercritical boiler capable of performing blending combustion of coke oven gas. The combustion adjustment method comprises the following steps: adopting nonlinear normal pagoda type air door air distribution openings by virtue of an eight-layer secondary air door, sequentially reducing the air door opening upwards, allowing the air door opening of a burnout air door at a diagonal part to be smaller than the air door opening at another diagonal part, and feeding two layers of secondary air at least by virtue of a gas gun by adopting a normal pagoda type air distribution mode. The normal pagoda type air door distribution opening of the secondary air door and different air door openings at two diagonal parts of the burnout air door are adopted, and multilayer air is fed by virtue of the gas gun, so that the fume temperature deviation at the hearth outlet can be effectively reduced, and the detonation accidents of the boiler are reduced. Moreover, according to stable combustion in a fuel enriched area on the middle lower part of the hearth and feeding of the gas gun, the NOx generation amount is greatly reduced, the boiler operates in a high-efficiency economic performance area, the comprehensive operating cost is reduced, and the adjustment method is simple.
Description
Technical field
The present invention relates to a kind of firing optimization method of mixing the super critical boiler burning producer gas, the different air distributions of the Secondary Air and burnout degree that are specifically related to super critical boiler adjust mode and each layer coal gas rifle operation mode, belong to Process In A Tangential Firing field of combustion technology.
Background technology
Certain supercritical boiler burner is wall-tangential firing mode, in burner layer overfire air port, coke-stove gas is installed and mixes burning system and device often organizing, be designed with 12 coal gas rifles altogether, every only exerting oneself is 3000 Nm3/h, gross capability amounts to 36000 Nm3/h, according to coke-stove gas caloric value be 17 ~ 19MJ/Nm3 calculate, expectation per hour can save mark 20 tons, coal, and boiler combustion stability and economy strengthen greatly, though this unit is gone into operation at present, but boiler four layers of coal gas mix the orlop coal gas rifle that only to have come into operation in burning system always, all the other 3 layers of coal gas rifles were never used, the NO of economizer exit smoke evacuation
xconcentration is comparatively large (about 500 mg/m also
3), still there is certain deviation in the discharge standard apart from national regulation, increase the operating cost of denitrification apparatus, current power plant adopts each layer secondary air register to keep the equal distribution wind method of same aperture in running, the after-flame air door of corner also keeps same aperture, such method of operation does not form Researched of Air Staging Combustion Burning Pulverized Coal in the main combustion zone of burner hearth, is unfavorable for reducing NO
xgrowing amount, and there is larger gas temperature windage in furnace outlet left and right sides, easily cause thermal deviation between heating surface tube panel large, partial tube tube wall is caused to be heated uneven, steam flow maldistribution in pipe, finally cause the overheated booster of heating surface piping to leak, cause equipment and personal safety accident.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of firing optimization method of mixing the super critical boiler burning producer gas, achieves and can meet safe and economical boiler operation, can reduce NO again
xthe method of operation of discharge, makes power plant can effectively reduce integrated operation cost, can reduce again the discharge of smoke pollution of boiler thing, to overcome the deficiency of prior art problem.
The technical scheme that the present invention takes is: a kind of firing optimization method of mixing the super critical boiler burning producer gas, comprise and a kind ofly mix the super critical boiler burning producer gas, this boiler comprises boiler furnace, water-cooling wall, secondary air register, after-flame air door and coal gas rifle, secondary air register is arranged on the four sides water-cooled wall in boiler furnace, comprise eight layers that arrange straight up successively, after-flame air door is arranged on the water-cooling wall corner above burner hearth inner second air door, described coal gas rifle comprises four layers, be arranged in from top to bottom two layers of secondary air register, three layers, six layers and seven layers of place, its firing optimization method comprises: eight layers of secondary air register adopt the air door air distribution aperture of nonlinear positive pagoda, throttle opening upwards reduces successively, after-flame air door is less than another diagonal angle place throttle opening at pair of horns place throttle opening, coal gas rifle drops into minimum two-layer under Secondary Air adopts the air distribution mode of positive pagoda.
Preferably, above-mentioned coal gas rifle is when unit load 300 ~ 400MW is interval, drop into two, three two-layer secondary air register place coal gas rifles, can ensure that fuel concentrates on the fuel-rich regions that lower furnace portion forms anoxic, for ensureing that the stability of burning is favourable, or when unit load 400 ~ 500MW is interval, drop into two, five two-layer secondary air register place coal gas rifles, the fuel-rich regions of burner hearth middle and lower part can be ensured, be conducive to the fractional combustion of fuel, reduce the growing amount of NOx, or when unit load 500 ~ 660MW is interval, input two+five is two-layer, the combination of three+six two-layer secondary air register place coal gas rifles or more than three layers secondary air register place coal gas rifles, primary zone can be made to the full extent to be in reducing atmosphere, full burner hearth forms the fuel-rich regions of an anoxycausis, due to the input of multilayer coal gas rifle, reduce primary zone temperature, be conducive to the fractional combustion of fuel, reduce the growing amount of NOx.
Preferably, one deck throttle opening 90% ~ 95% of above-mentioned secondary air register, two layers of throttle opening 80% ~ 90%, three layers of throttle opening 65% ~ 75%, four layers of throttle opening 58% ~ 65%, five layers of throttle opening 53% ~ 55%, six layers of throttle opening 45% ~ 53%, seven layers of throttle opening 33% ~ 40%, eight layers of throttle opening 25% ~ 33%, after-flame air door is 45% ~ 55% at pair of horns place throttle opening, another diagonal angle place throttle opening is 75% ~ 85%, by the aperture of secondary air register and the aperture of after-flame air door, allow boiler operatiopn under optimum stabilization and best combustion efficiency, ensure the safe operation of boiler and reduce the integrated operation cost of boiler.
Beneficial effect of the present invention: compared with prior art, the present invention has following effect:
(1) Secondary Air adopts the air distribution mode of non-linear positive pagoda, by staged air distribution mode, total air needed for burning is sent in burner hearth according to the mode of non-linear positive pagoda, lower floor's secondary air register aperture comparatively large (aperture reaches more than 90%), upper strata secondary air register aperture less (throttle opening reaches about 30%), this air distribution mode makes the rotatory inertia of burner hearth inscribed circle weaken gradually along with the increase of furnace height, the rotatory inertia of lower floor's burner can not be delivered to upper strata burner along with the rising of inner flue gas of the stove, furnace outlet gas temperature deviation is reduced, the conference of furnace outlet gas temperature deviation is allowed to cause the Load Distribution on furnace outlet cross section more evenly good, the heat absorption of each heating surface and pipeloop inner stream flow more evenly good, not easily there is the accidents such as the overheated and pipe generation tube bursting and leakage of heating surface, ensure the fuel-rich regions smooth combustion of burner hearth middle and lower part on the other hand, simultaneously owing to decreasing the air quantity of burner hearth middle and upper part, form reducing atmosphere, NO can be reduced
xgrowing amount, add the input of each layer coal gas rifle, main fuel district temperature can be reduced, thus reduce NO further
xgrowing amount,
(2) after-flame air door is less than at another diagonal angle place throttle opening at pair of horns place throttle opening, the after-flame throttle opening at two diagonal angles place is equal, there is stronger rigidity at another diagonal angle place that burnout degree takes this air distribution mode can ensure to liquidate to suppress the residual rotation in stove, further reduction actual furnace outlet gas temperature windage, reduce the thermal deviation between heating surface pipe, allow each heating surface absorb heat and pipeloop inner stream flow more evenly good, thus reduction pipe explosion accident hidden danger;
(3) four layers of coal gas rifle drop into minimum two-layer under different air distribution mode, drop into according to each layer coal gas rifle, realize each coke charge producer gas under different furnace heights, to carry out classification mix burning, under the prerequisite ensureing combustion stability and boiler efficiency, realize each layer coal gas in combustion and mix burning and corresponding air distribution mode, to suppress NO
xgenerate, reduce the operating cost of denitrification apparatus, and do not affect overall furnace temperature, boiler operatiopn good stability, and combustion economization is better;
(4) when unit load is lower, fire box temperature is corresponding reduction also, by the burning of two-layer or two-layer above coal gas rifle correspondence, ensures the catch fire burn-off rate of smooth combustion and coal dust and the safe and stable operation of unit of coal gas;
(5) this firing optimization method is easy to implement, meets coal dust firing principle, at guarantee boiler combustion efficiency and furnace outlet NO
xunder the prerequisite that concentration of emission is up to standard, safety and the economical operation of boiler can be ensured.
Accompanying drawing explanation
Fig. 1 is furnace height direction of the present invention sectional view;
Fig. 2 is burner hearth Secondary Air horizontal direction sectional view of the present invention;
Fig. 3 is burner hearth burnout degree horizontal direction sectional view of the present invention;
Fig. 4 is burner hearth of the present invention each layer coal gas gun burner device distribution map.
In figure, 1-boiler furnace, 2-water-cooling wall, 3-secondary air register, 4-after-flame air door, 5-coal gas rifle.
Detailed description of the invention
Embodiment: as shown in Fig. 1 ~ 4, a kind of firing optimization method of mixing the super critical boiler burning producer gas, comprise and a kind ofly mix the super critical boiler burning producer gas, this boiler comprises boiler furnace 1, water-cooling wall 2, secondary air register 3, after-flame air door 4 and coal gas rifle 5, secondary air register 3 is arranged on the four sides water-cooled wall in boiler furnace, comprise eight layers that arrange straight down successively, after-flame air door 4 is arranged on the water-cooling wall corner above burner hearth inner second air door, described coal gas rifle 5 comprises four layers, is arranged in from top to bottom two layers (in figure AB layers) of secondary air register 3, three layers (in figure BC layer), five layers (in figure DE layers) and six layers of (in figure EF layer) place, its firing optimization method comprises: eight layers of secondary air register 3 adopt the air door air distribution aperture of nonlinear positive pagoda, and throttle opening upwards reduces successively, one deck (in figure AA layer) throttle opening 95%, two layers of (in figure AB layer) throttle opening 85%, three layers of (in figure BC layer) throttle opening 70%, four layers of (in figure CC layer) throttle opening 60%, five layers of (in figure CD layer) throttle opening 55%, six layers of (in figure DE layer) throttle opening 50%, seven layers of (in figure EF layer) throttle opening 35%, eight layers of (in figure FF layer) throttle opening 30%, after-flame air door 4 is 50% at pair of horns place throttle opening, another diagonal angle place throttle opening is 80%.
Preferably, above-mentioned coal gas rifle is when unit load 300 ~ 400MW is interval, drop into two, three two-layer secondary air register place coal gas rifles, can ensure that fuel concentrates on the fuel-rich regions that lower furnace portion forms anoxic, for ensureing that the stability of burning is favourable, or when unit load 400 ~ 500MW is interval, drop into two, five two-layer secondary air register place coal gas rifles, the fuel-rich regions of burner hearth middle and lower part can be ensured, be conducive to the fractional combustion of fuel, reduce the growing amount of NOx, or when unit load 500 ~ 660MW is interval, input two+five is two-layer, the combination of three+six two-layer secondary air register place coal gas rifles or more than three layers secondary air register place coal gas rifles, primary zone can be made to the full extent to be in reducing atmosphere, full burner hearth forms the fuel-rich regions of an anoxycausis, due to the input of multilayer coal gas rifle, reduce primary zone temperature, be conducive to the fractional combustion of fuel, reduce the growing amount of NOx.
Above-mentioned firing optimization method adopts Secondary Air to adopt the air distribution mode of non-linear positive pagoda, by staged air distribution mode, total air needed for burning is sent in burner hearth according to the mode of non-linear positive pagoda, lower floor's secondary air register aperture comparatively large (aperture reaches more than 90%), upper strata secondary air register aperture less (throttle opening reaches about 30%), this air distribution mode makes the rotatory inertia of burner hearth inscribed circle weaken gradually along with the increase of furnace height, the rotatory inertia of lower floor's burner can not be delivered to upper strata burner along with the rising of inner flue gas of the stove, furnace outlet gas temperature deviation is reduced, the conference of furnace outlet gas temperature deviation is allowed to cause the Load Distribution on furnace outlet cross section more evenly good, the heat absorption of each heating surface and pipeloop inner stream flow more evenly good, not easily there is the accidents such as the overheated and pipe generation tube bursting and leakage of heating surface, ensure the fuel-rich regions smooth combustion of burner hearth middle and lower part on the other hand, simultaneously owing to decreasing the air quantity of burner hearth middle and upper part, form reducing atmosphere, NO can be reduced
xgrowing amount, add the input of each layer coal gas rifle, main fuel district temperature can be reduced, thus reduce NO further
xgrowing amount, four layers of coal gas rifle drop into minimum two-layer under different air distribution mode, drop into according to each layer coal gas rifle, realize each coke charge producer gas under different furnace heights, to carry out classification mix burning, under the prerequisite ensureing combustion stability and boiler efficiency, realize each layer coal gas in combustion and mix burning and corresponding air distribution mode, to suppress NO
xgenerate, reduce the operating cost of denitrification apparatus, and do not affect overall furnace temperature, boiler operatiopn good stability, and combustion economization is better.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (3)
1. mix the firing optimization method of the super critical boiler burning producer gas for one kind, comprise and a kind ofly mix the super critical boiler burning producer gas, this boiler comprises boiler furnace (1), water-cooling wall (2), secondary air register (3), after-flame air door (4) and coal gas rifle (5), described secondary air register (3) is arranged on four sides water-cooling wall (2) wall in boiler furnace (1), comprise eight layers that arrange straight down successively, described after-flame air door (4) is arranged on water-cooling wall (2) corner above burner hearth inner second air door, described coal gas rifle (5) comprises four layers, be arranged in from top to bottom two layers of secondary air register (3), three layers, six layers and seven layers of place, it is characterized in that: its firing optimization method comprises: eight layers of secondary air register (3) adopt the air door air distribution aperture of nonlinear positive pagoda, throttle opening upwards reduces successively, after-flame air door (4) is less than another diagonal angle place throttle opening at pair of horns place throttle opening, coal gas rifle (5) drops into minimum two-layer adopt the air distribution mode of positive pagoda at Secondary Air under.
2. a kind of firing optimization method of mixing the super critical boiler burning producer gas according to claim 1, it is characterized in that: described coal gas rifle (5) is when unit load 300 ~ 400MW is interval, drop into two, three two-layer secondary air register place coal gas rifles, or when unit load 400 ~ 500MW is interval, drop into two, six two-layer secondary air register place coal gas rifles, or when unit load 500 ~ 660MW is interval, drop into the combination of two+six two-layer, three+seven two-layer secondary air register place coal gas rifles or more than three layers secondary air register place coal gas rifles.
3. a kind of firing optimization method of mixing the super critical boiler burning producer gas according to claim 1, it is characterized in that: one deck throttle opening 90% ~ 95%, two layers of throttle opening 80% ~ 90%, three layers of throttle opening 65% ~ 75%, four layers of throttle opening 58% ~ 65%, five layers of throttle opening 53% ~ 55%, six layers of throttle opening 45% ~ 53%, seven layers of throttle opening 33% ~ 40%, eight layers of throttle opening 25% ~ 33% of described secondary air register (3), described after-flame air door (4) pair of horns place throttle opening be 45% ~ 55%, another diagonal angle place throttle opening is 75% ~ 85%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107461759A (en) * | 2017-07-27 | 2017-12-12 | 华北电力科学研究院有限责任公司 | Secondary air register aperture optimization method and system |
| 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 |
| CN113188118A (en) * | 2021-04-09 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Equipment and method for bulk blending combustion of industrial tail gas in circulating fluidized bed boiler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107461759A (en) * | 2017-07-27 | 2017-12-12 | 华北电力科学研究院有限责任公司 | Secondary air register aperture optimization method and system |
| CN107461759B (en) * | 2017-07-27 | 2023-10-03 | 华北电力科学研究院有限责任公司 | Secondary air door opening optimizing method and system |
| 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 |
| CN113188118A (en) * | 2021-04-09 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Equipment and method for bulk blending combustion of industrial tail gas in circulating fluidized bed boiler |
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| CN104713064B (en) | 2016-08-31 |
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Address after: 550002 Jiefang Road, Guizhou, No. 251, Applicant after: ELECTRIC POWER RESEARCH INSTITUTE OF GUIZHOU POWER GRID CO., LTD. Address before: 550002 Jiefang Road, Guizhou, No. 251, Applicant before: Guizhou Power Test Institute |
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