CN105202536A - Method for improving coal-slime-whole-burning circulating fluidized bed boiler efficiency - Google Patents
Method for improving coal-slime-whole-burning circulating fluidized bed boiler efficiency Download PDFInfo
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- CN105202536A CN105202536A CN201510698279.XA CN201510698279A CN105202536A CN 105202536 A CN105202536 A CN 105202536A CN 201510698279 A CN201510698279 A CN 201510698279A CN 105202536 A CN105202536 A CN 105202536A
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Abstract
The invention discloses a method for improving coal-slime-whole-burning circulating fluidized bed boiler efficiency. The original outlet size of a hearth is reduced with a reduction ratio of 1:(0.80 to 0.91). An original boiler is transformed to solve the above problems in coal-slime-whole-burning of the circulating fluidized bed boiler, when the load carrying capability is increased to rated load and full load, the bed temperature is restored to be normal temperature, and a returning amount is also obviously increased. The returning temperature is 970 to 980 DEG C, particularly the concentration of nitric oxides in discharged smoke is lowered to about 100mg/m<3>, and the smoke denitrification cost is reduced. The usage amount of ammonium hydroxide is greatly reduced, and more cost is reduced each year.
Description
Technical field
The present invention relates to a kind of method improving clean burn slime circulating fluidized bed boiler efficiency.
Background technology
China is big coal country, and along with the depth & wideth of my Coal dressing is all in fast development, the output of coal slime obviously rises, so the tool that effectively utilizes of coal slime is of great significance.The semi-solid thing of the moisture formation of coal slime general reference coal dust is a kind of product in coal production process.Coal slime has following characteristics, and (1) fine size, fraction of particle are many, is especially less than 200 object particulates and accounts for 70% ~ 90%; (2) retentiveness is strong, and moisture is high; (3) content of ashes is high, and caloric value is lower; (3) stickiness is larger.Contain more clay class mineral due to general in coal slime, moisture is higher in addition, and granularmetric composition is thin, so most of coal slime stickiness is large, what have also has certain mobility.
Some power plant, on original old boiler basis, mixes burning coal slirne, both reduces investment outlay like this, takes full advantage of again discarded object coal slime, thus increases economic efficiency.But due to the odjective cause of some boilers and the characteristic of coal slime, such as furnace depth not, the flowing velocity of coal slime in material returning device be slow, the thinner flowing velocity of granularity of coal slime is slower etc.Making boiler create a series of problem when using coal slime, mainly causing material air-teturning temperature too high, over-limit condition.Constrain boiler load, and the concentration of nitrogen oxide raises.
Such as, the Circulating Fluidized Bed Boiler of Jinan one power & light company is since coal slime of all burning, after being in a stove and normal operation always, on-load difficulty, load band is less than design rated load, and on-load ability is all in about 80%, when load is more than 80%, occur that bed temperature temperature is too high, reach 980-1000 DEG C; Occur that returning charge is few, material air-teturning temperature is high about 1010 DEG C simultaneously; Smoke evacuation nitrogen oxide is high, and concentration reaches 135mg/m
3etc. problem.
Summary of the invention
For solving the above problem that CFBB clean burn coal slime occurs, the invention provides a kind of furnace outlet reforming technology being suitable for CFBB clean burn coal slime.
Improve a method for clean burn slime circulating fluidized bed boiler efficiency, at least one original furnace outlet size reduced, reduce in scale is 1:0.80 ~ 0.91.
Preferably, reduce in scale is 1:0.904, and the furnace outlet being namely of a size of 1m is reduced into 0.904m, and according to a large amount of experimental verifications and analysis, this minification, makes the performance of burning sludge with circulating fluidized-bed boiler best.
The whole combustion process of the CFBB in the present invention is carried out in burner hearth, and described burner hearth is connected with cyclone separator by burner hearth flue, and ash-laden gas and coal slime enter cyclone separator by burner hearth flue.
Furnace outlet is the outlet between burner hearth flue and cyclone separator, and its size refers to the distance in furnace outlet horizontal direction.
Because boiler size cannot be changed by boiler factory settings, so the present invention realizes reducing outlet size by thickening castable inside burner hearth flue, simple process is feasible, easily operate.
CFBB is the pressure vessel and equipment of state compulsion supervision, is generally standard model.Furnace outlet technique in the present invention is generally suitable for the coal-fired steam boiler of various standard, the model of boiler mainly contains 10 tons/h, 20 tons/h, 35 tons/h, 75 tons/h, 130 tons/h etc., through great many of experiments and analysis verification, when CFBB is 130 tons/h HTHP recirculating fluidized bed, the size of furnace outlet is transform as 1140mm by original 1260mm, remodeling method realizes reducing outlet size, its performance and excellent effect by thickening castable inside burner hearth flue.
Described furnace outlet is two, and such as, described 130 tons/h HTHP recirculating fluidized bed, whole burning carries out under higher fluidising air velocity, and Control for Kiln Temperature is at 980 DEG C, and ash-laden gas is two strands, left and right in furnace outlet punishment, enters two cyclone separators.So when transforming, the size of two furnace outlets is reduced, its performance and effect more excellent.
What adopt said method obtains a kind of CFBB improving clean burn coal slime efficiency, and at least one original boiler furnace outlet size reduced, reduce in scale is 1:0.80 ~ 0.91.
Preferably, described furnace outlet is two, significantly improves boiler efficiency.
Principle of the present invention is: the gas flow that CFBB passes into and power certain, according to the state of coal slime material, reduce furnace outlet, furnace outlet place pressure step-down, add the wind speed at furnace outlet place, coal slime bulky grain and coal slime ash are brought into cyclone separator, because coal slime particle is larger by larger wind speed in burner hearth, add the centrifugal degree of coal slime particle, according to F=mv
2/ r, now the centrifugal force that bears of coal slime particle increases, more be conducive to coal slime particle to fall in material returning device, in material returning device, coal slime flowing velocity is accelerated, short in the material returning device holdup time, there is not second-time burning in coal slime in material returning device, therefore material air-teturning temperature reduces relatively, entered in burner hearth in time by material returning device, so returning charge amount obviously increases.Because coal slime particle enters in cyclone separator by furnace outlet endlessly, then enter in burner hearth by material returning device, circulation is good, add the thickness of feed layer in burner hearth, material total amount increase to a certain degree in stove, corresponding reduction bed temperature, material air-teturning temperature also can reduce, improve on-load ability to rated load, time at full capacity, bed temperature returns back to normal temperature.The NOx that nitrogen oxide is at high temperature (1000 DEG C more than-1400 DEG C) oxidation of nitrogen in air and generates, because material air-teturning temperature reduces, nitrogen oxide generation is reduced, the ammoniacal liquor of nitrogen oxides treatment is with regard to corresponding minimizing.
The furnace outlet reduce in scale of CFBB clean burn coal slime of the present invention is 1:0.80 ~ 0.91, when minification is less than 0.80, furnace outlet is caused to reduce excessively, although now wind speed is larger, but furnace outlet is too small, total slime content that furnace outlet is taken out of is relatively less, makes boiler on-load difficulty equally, is unfavorable for returning charge; When minification is greater than 0.91, now wind speed does not reach requirement, can produce and not transform front the same problem, causing larger economic security loss.
The invention has the beneficial effects as follows:
The fire coal circulating fluid bed boiler improvement of standard is the CFBB of applicable clean burn coal slime by the present invention, and the method for boiler improvement is simple and feasible, easily operates, and is applicable to applying of standard coal steam boiler transformation.
By to original boiler improvement, solve the above problem that CFBB clean burn coal slime occurs, improve on-load ability to rated load, at full capacity time bed temperature temperature return back to normal temperature, returning charge amount also obviously increases.Material air-teturning temperature 970-980 DEG C, nitrogen oxide of particularly discharging fume reduces concentration and reaches 100mg/m
3left and right, decreases flue-gas denitrification cost.Greatly reduce ammoniacal liquor use amount, annual cost-saving more.
Accompanying drawing explanation
Fig. 1 is the furnace outlet cross-sectional view of CFBB clean burn coal slime.
Wherein, 1, cyclone separator, 2, reduce after furnace outlet size, 3, original furnace outlet size, 4, burner hearth flue, 5, cast wall.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1
130 tons/h HTHP (the 9.8MPa of power & light company of Jinan City one, 540 DEG C) CFBB is since whole burning coal slimes, after being in a stove and normal operation always, on-load difficulty, load band is less than design rated load, and on-load ability is all in about 80%, when load is more than 80%, occur that bed temperature temperature is too high, reach 980-1000 DEG C; Occur that returning charge is few, material air-teturning temperature is high about 1010 DEG C simultaneously; Smoke evacuation nitrogen oxide is high, and concentration reaches 135mg/m
3etc. problem.
For solving the above problem that 130 tons/h Circulating Fluidized Bed Boiler clean burn coal slime occurs, the said firm devises a kind of furnace outlet being suitable for CFBB clean burn coal slime, namely original furnace outlet is transformed, by thickening castable inside two burner hearth flues, reduce outlet size, furnace outlet size by 1260 original ㎜, narrow down to 1140 ㎜.
Boiler in the present embodiment is 130 tons/h HTHP (9.8MPa, 540 DEG C) CFBB, and burner hearth cross section is 3972 × 7750mm
2; Furnace roof absolute altitude is 31380mm, and fin panel casing is welded by φ 60 × 5 and 6 × 45mm band steel.Whole burning carries out under higher fluidising air velocity, and Control for Kiln Temperature is at 980 DEG C, and ash-laden gas is two strands, left and right in furnace outlet punishment, enter two cyclone separators, structure as shown in Figure 1, wherein, 1 is cyclone separator, 2 is the furnace outlet size after reducing, it is of a size of 1140mm, and 3 is the furnace outlet size of original boiler, and it is of a size of 1260mm, 4 is the burner hearth flue of original boiler, and 5 is the cast wall made by thickening castable.
By transformation, solve the above problem that Circulating Fluidized Bed Boiler clean burn coal slime occurs, improve on-load ability to rated load, at full capacity time bed temperature temperature return back to normal temperature about 980 DEG C, returning charge amount also obviously increases.Material air-teturning temperature 970-980 DEG C, nitrogen oxide of particularly discharging fume reduces concentration and reaches 100mg/m
3left and right, decreases flue-gas denitrification cost, is to drop to transformation afterwards less than 9 tons with 12 tons of ammoniacal liquor before transformation.Greatly reduce ammoniacal liquor use amount, annual saving about more than 30 ten thousand yuan of this cost.
Embodiment 2
Power & light company of Jinan City one transforms original boiler, design one is suitable for the furnace outlet of 130 tons/h Circulating Fluidized Bed Boiler clean burn coal slime, namely original furnace outlet is transformed, by thickening castable inside two burner hearth flues, reduce outlet size, furnace outlet size by 1260 original ㎜, narrow down to 1138 ㎜.
Boiler in the present embodiment is 130 tons/h HTHP (9.8MPa, 540 DEG C) CFBB, and burner hearth cross section is 3972 × 7750mm
2; Furnace roof absolute altitude is 31380mm, and fin panel casing is welded by φ 60 × 5 and 6 × 45mm band steel.Whole burning carries out under higher fluidising air velocity, and Control for Kiln Temperature is at 980 DEG C, and ash-laden gas is two strands, left and right in furnace outlet punishment, enters two cyclone separators.
By transformation, the problems such as the material air-teturning temperature that solution Circulating Fluidized Bed Boiler clean burn coal slime occurs is high, smoke evacuation oxide concentration is high, improve on-load ability to rated load, at full capacity time bed temperature temperature return back to normal temperature about 980 DEG C, returning charge amount also obviously increases.Material air-teturning temperature 970-980 DEG C, nitrogen oxide of particularly discharging fume reduces concentration and reaches 100mg/m
3left and right, decreases flue-gas denitrification cost.Greatly reduce ammoniacal liquor use amount, save great amount of cost every year.
Embodiment 3
Power & light company of Jinan City one transforms original boiler, design one is suitable for the furnace outlet of 130 tons/h Circulating Fluidized Bed Boiler clean burn coal slime, namely original furnace outlet is transformed, by thickening castable inside two burner hearth flues, reduce outlet size, furnace outlet size by 1260 original ㎜, narrow down to 1071 ㎜.
Boiler in the present embodiment is 130 tons/h HTHP (9.8MPa, 540 DEG C) CFBB, and burner hearth cross section is 3972 × 7750mm
2; Furnace roof absolute altitude is 31380mm, and fin panel casing is welded by φ 60 × 5 and 6 × 45mm band steel.Whole burning carries out under higher fluidising air velocity, and Control for Kiln Temperature is at 980 DEG C, and ash-laden gas is two strands, left and right in furnace outlet punishment, enters two cyclone separators.
By transformation, the problems such as the material air-teturning temperature that solution Circulating Fluidized Bed Boiler clean burn coal slime occurs is high, smoke evacuation oxide concentration is high, improve on-load ability to rated load, at full capacity time bed temperature temperature return back to normal temperature about 980 DEG C, returning charge amount also obviously increases.Material air-teturning temperature 970-980 DEG C, nitrogen oxide of particularly discharging fume reduces concentration and reaches 100mg/m
3left and right, decreases flue-gas denitrification cost.Greatly reduce ammoniacal liquor use amount, save great amount of cost every year.
Embodiment 4
Power & light company of Jinan City one transforms original boiler, design one is suitable for the furnace outlet of 75 tons/h medium temperature and medium pressure CFBB clean burn coal slime, namely original furnace outlet is transformed, by thickening castable inside two burner hearth flues, reduce outlet size, furnace outlet size by 1000 original ㎜, narrow down to 904.77 ㎜.
Boiler in the present embodiment is 75 tons/h medium temperature and medium pressure CFBB, and whole burning carries out under higher fluidising air velocity, and Control for Kiln Temperature is at 800-900 DEG C, and ash-laden gas is two strands, left and right in furnace outlet punishment, enters two cyclone separators.75 tons/h medium temperature and medium pressure CFBB appearance and size (full-size): high × wide × dark=33850 × 12000 × 16248mm.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. improve a method for clean burn slime circulating fluidized bed boiler efficiency, it is characterized in that: at least one original furnace outlet size reduced, reduce in scale is 1:0.80 ~ 0.91.
2. the method for claim 1, is characterized in that: described reduce in scale is 1:0.904.
3. method as claimed in claim 2, is characterized in that: described burner hearth is connected with cyclone separator by burner hearth flue.
4. the method for claim 1, is characterized in that: described furnace outlet is the outlet between burner hearth flue and cyclone separator.
5. the method according to any one of claim 3 or 4, is characterized in that: realize reducing outlet size by thickening castable inside burner hearth flue.
6. the method for claim 1, is characterized in that: the coal-fired steam boiler being suitable for various standard.
7. method as claimed in claim 6, is characterized in that: the model of described boiler is 10 tons/h, 20 tons/h, 35 tons/h, 75 tons/h, the recirculating fluidized bed of 130 tons/h.
8. method as claimed in claim 7, is characterized in that: described boiler is 130 tons/h Circulating Fluidized Bed Boiler.
9. the method for claim 1, is characterized in that: furnace outlet size by 1260 original ㎜, narrow down to 1140 ㎜, and described CFBB is 130 tons/h Circulating Fluidized Bed Boiler.
10. improve a CFBB for clean burn coal slime efficiency, it is characterized in that: at least one original boiler furnace outlet size reduced, reduce in scale is 1:0.80 ~ 0.91.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202392778U (en) * | 2011-12-16 | 2012-08-22 | 中青国能低碳技术(北京)有限公司 | Circulating fluidized bed boiler for improving burning temperature stability in boiler |
| CN202973068U (en) * | 2012-12-13 | 2013-06-05 | 青岛特利尔环保锅炉工程有限公司 | Fired water-coal-slurry circulating fluidized bed boiler |
| CN103528053A (en) * | 2013-10-15 | 2014-01-22 | 蒋卫东 | Method for burning fuels with ultralow heat value such as coal gangue and slag for circulating fluidized bed boiler |
| CN203501161U (en) * | 2013-06-09 | 2014-03-26 | 苏州展阳新能源科技有限公司 | Coal slurry burning boiler |
| CN204554796U (en) * | 2015-04-10 | 2015-08-12 | 东方电气集团东方锅炉股份有限公司 | A kind of inverted steps formula furnace boiler |
-
2015
- 2015-10-23 CN CN201510698279.XA patent/CN105202536B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202392778U (en) * | 2011-12-16 | 2012-08-22 | 中青国能低碳技术(北京)有限公司 | Circulating fluidized bed boiler for improving burning temperature stability in boiler |
| CN202973068U (en) * | 2012-12-13 | 2013-06-05 | 青岛特利尔环保锅炉工程有限公司 | Fired water-coal-slurry circulating fluidized bed boiler |
| CN203501161U (en) * | 2013-06-09 | 2014-03-26 | 苏州展阳新能源科技有限公司 | Coal slurry burning boiler |
| CN103528053A (en) * | 2013-10-15 | 2014-01-22 | 蒋卫东 | Method for burning fuels with ultralow heat value such as coal gangue and slag for circulating fluidized bed boiler |
| CN204554796U (en) * | 2015-04-10 | 2015-08-12 | 东方电气集团东方锅炉股份有限公司 | A kind of inverted steps formula furnace boiler |
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