CN105087098B - Resistive connection slag biomass composite fuel for circulating fluidized bed boiler - Google Patents
Resistive connection slag biomass composite fuel for circulating fluidized bed boiler Download PDFInfo
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- CN105087098B CN105087098B CN201510459490.6A CN201510459490A CN105087098B CN 105087098 B CN105087098 B CN 105087098B CN 201510459490 A CN201510459490 A CN 201510459490A CN 105087098 B CN105087098 B CN 105087098B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Solid Fuels And Fuel-Associated Substances (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a kind of efficient resistive connection slag biomass composite fuels for circulating fluidized bed boiler, including at least two in the wooden leftover pieces, bamboo leftover pieces, stalk, bark, fuel wood, rice husk, peanut shell, broken branch.To improve slagging phenomenon, boiler ash is added in the hybrid fuel, the mass fraction of boiler ash is 1%~4%.The biomass composite fuel can prevent the heating devices slagging such as biomass boiler water-cooling wall, the even heat that its burning generates is set to be distributed in burner hearth, improve the efficiency of combustion of biomass fuel, make the utilization rate higher of biomass energy, the thermal efficiency higher of boiler, and improve the service life of circulating fluidized bed boiler.
Description
Technical field
The present invention relates to a kind of biomass fuels, particularly relate to a kind of efficient resistive connection slag life for circulating fluidized bed boiler
Substance hybrid fuel.
Background technology
Since 21 century, energy and environment become the hot spot that countries in the world are paid close attention to jointly, more and more states
Family actively pushes forward biomass energy using Bio-energy Development as the grand strategy measure for substituting fossil energy, ensureing energy security
It develops and uses, effect of the biomass energy in the supply of many national energies is constantly enhancing.
Since plant absorbs the elements such as Ca, Mg, K, Na, Si, S, P during growth, after harvesting, these elements
Remain in plant, in addition can inevitably be mixed during the harvesting of biomass, processing and transport part sandstone,
Soil etc., to increase the content of ashes of biomass fuel.A large amount of inorganic mineral substance element contained in biomass ash
Biomass combustion process can be caused to seriously affect, during burning, the eutectic of low melting point is generated, when the temperature in burner hearth
Degree will be melted higher than after its melting temperature (about 1000 DEG C), be adhered to water-cooling wall etc., and the heating devices such as water-cooling wall is hindered to inhale
The heat that fuel combustion generates, heat and flammable flying dust are received as flue gas is discharged, causes the loss of heat.Biomass boiler slagging
It is the main reason for causing biomass boiler efficiency to reduce to hinder heat exchange.
According to related Biomass Energy Technology at present using level, biomass generation is that one kind can be extensive, efficient
Using the technological means of biomass, which is transported to boiler combustion by biomass fuel, then will by steam turbine and generator
Thermal energy is converted into electric energy, realizes and converts biomass energy to clean electric energy.Technology of Circulating Fluidized Bed Boiler is in biomass
It is widely used in generation technology, a kind of higher biomass direct combustion power generation technology of efficiency, it has efficient, machinery, chemistry damage
Lose few and environmental protection feature.By the long-term combustion research to circulating fluidized bed boiler, according to law of conservation of energy, constant weight
Exotic fuels be theoretically changed into more electric energy than the low-grade heat of equivalent weight, still, in biomass direct-fired hair
Electricity technique in, the biomass of high heating value can not necessarily be transformed into more electricity, using it is inappropriate when, it is also possible to damage
Boiler, generated energy number with the moisture content of fuel, particle diameter distribution, density have close relationship, to influence combustion chemistry
The uniformity of the intensity and in-furnace temperature field distribution of reaction is efficiently using for the caloic that fuel has after all.Biomass
Boiler for power generation, its general furnace height up to 15 meters or more, water-cooling wall of heat generated for the burning of organism-absorbing matter etc. by
Thermal is disposed around and the tail portion of furnace outlet or even boiler smoke flow, and biomass fuel leans on fluidized wind in burner hearth
It is evenly distributed in burner hearth, when boiler combustion, the heat distribution and the physics and chemistry of institute's burning fuel inside burner hearth are special
Property has relationship, when heat is unevenly distributed in burner hearth, causes the reduction of boiler efficiency；Even cause boiler hot-spot
Damage, boiler tube bursting are exactly common one of failure.
Currently, favorably adding the method for fossil fuel or resistive connection slag agent in biomass to improve the burning effect of fuel
Rate reduces slagging, to improve the efficiency of boiler.But sulfur content is far above biomass fuel in fossil fuel, adds fossil
Fuel just brings environmental pollution, and fossil fuel is non-renewable；And add resistive connection slag agent, then improve fuel integral into
This, is unfavorable for the popularization and application of biomass fuel.
It is listed below that two kinds of efficiencies of combustion are higher, biomass fuel with resistive connection slag effect.
Chinese patent application " biomass molding fuel ", application number：201510092860.7 disclosing a kind of biomass fuel
Material, it is described by crushing, mixing, drying and extruding pelletizing forming after being mixed by biomass raw material particle and fuel additive
The weight percent of biomass raw material particle is 90%~95%, and the weight percent of the fuel additive is 5%~10%；
The biomass raw material particle is made of sawdust, bamboo scraps, stalk and straw, the fuel additive by quick lime, combustion adjuvant with
And high clay composition, the ingredient of the combustion adjuvant is magnesite soil, magnesium nitrate, magnesia or iron oxide.
Chinese patent application " biomass fuel ", application number：201210234656.0 a kind of biomass fuel is disclosed,
Include following component according to weight percent containing de- potassium agent and antichlor in the biomass fuel, stalk 50%~
75%, C4-C9 higher alcohols 15%~30%, solvent naphtha 1%~4%, starch 10%~20% take off potassium agent 2%~4%, dechlorination
Agent 2%~4%.
Above two biomass fuel all has certain resistive connection slag effect, but the former need to be added by quick lime, combustion adjuvant
And fuel additive made of high clay, the latter need to be added de- potassium agent and antichlor, both increase the industry of biomass fuel
Production difficulty, and production cost is greatly improved, it is unfavorable for promoting and applying.
Invention content
The biomass composite fuel that the purpose of the present invention is to provide a kind of resistive connection slag effects is good, production cost is low.
To achieve the above object, the efficient resistive connection slag provided by the present invention for circulating fluidized bed boiler is biomass combined
In fuel, including the wooden leftover pieces, bamboo leftover pieces, stalk (such as straw), bark, fuel wood, rice husk, peanut shell, broken branch extremely
It is two kinds few.To improve slagging phenomenon, common coal-burning boiler lime-ash is added in the hybrid fuel (also can be by this biomass pot
Boiler ash sediment does certain expendable supplement, until its metal concentration content coal-burning boiler lime-ash that is excessive, then more renewing), Boiler Ash
Slag accounts for the 1%~4%. of the hybrid fuel gross mass
Preferably, the key component of the boiler ash and the mass percent of each component are： SiO237~50%,
Al2O328~40%, Fe2O34~20%, CaO 1~8%, surplus are a small amount of magnesium, sulphur, carbon etc..
It is further preferred that the key component of the boiler ash and the mass percent of each component are：SiO240~
45%, Al2O330~37%, Fe2O315~20%, CaO 1~5%, surplus are a small amount of magnesium, sulphur, carbon etc..
Preferably, in the boiler ash, grain size is in mass fraction >=90%. of 3mm lime-ash below
Preferably, the constituent mass percentage of the hybrid fuel is：The wooden leftover pieces 10%~20%, stalk 25%~
40%, bark 15%~25%, fuel wood 18%~25%, rice husk or peanut shell 5%~15%, boiler ash 1%~3%,
His component≤15%, above-mentioned each component content are mass percent (following as unspecified is mass percent).Its
His group is divided into the biological material gathered materials on the spot, depending on the biomass fuel factory location the case where depending on, such as reed slag, sawdust, mushroom
One or several kinds in mushroom base, tree root, velveteen, broken branch or pinecone ball.
It is further preferred that the constituent mass percentage of the hybrid fuel is：The wooden leftover pieces 15%, stalk 30%, tree
Skin 18%, fuel wood 20%, rice husk 5%, boiler ash 2%, other components described in other components 10%. are reed slag, sawdust, mushroom
One or several kinds in mushroom base, tree root, velveteen, broken branch or pinecone ball.
Preferably, the constituent mass percentage of the hybrid fuel is：The wooden leftover pieces 10%~15%, stalk 15%~
20%, bark 10%~15%, fuel wood 15%~20%, rice husk or peanut shell 15%~20%, boiler ash 1%~3%, bamboo
Leftover pieces 15%~25%, reed slag 9%~15%, other components≤5%. other components are sawdust, mushroom base, tree
One or several kinds in root, velveteen, broken branch, pinecone ball.
Preferably, the constituent mass percentage of the hybrid fuel is：The wooden leftover pieces 10%~15%, stalk 25%~
40%, bark 10%~25%, fuel wood 10%~20%, rice husk or peanut shell 5%~15%, boiler ash 1%~3%, mushroom
Mushroom base 5%~15%, 5%~10%. other components of other components be reed slag, sawdust, tree root, velveteen, broken branch,
One or several kinds in pinecone ball.
Preferably, the constituent mass percentage of the hybrid fuel is：The wooden leftover pieces 20%, stalk 25%, bark 15%,
Rice husk 10%, boiler ash 2%, bamboo leftover pieces 18%, mushroom base 5%, sawdust 5%.
Preferably, the constituent mass percentage of the hybrid fuel is：The wooden leftover pieces 25%, straw 15%, cornstalk
15%, fuel wood 25%, rice husk 5%, boiler ash 1.5%, tree root 3.5%, velveteen 5%, pinecone ball 5%.
Preferably, the constituent mass percentage of the hybrid fuel is：Grain size ＜ 5mm's accounts for 20%~40%, 5mm≤grain
The accounting for for 30%~50%, 50mm ＜ grain sizes≤200mm that account for of diameter≤50mm 10%~30%. be more preferably：Grain size ＜
5mm account for 30%~40%, 5mm≤grain size≤50mm account for 40%~50%, 50mm ＜ grain sizes≤200mm account for 10%~
30%.
Preferably, each component is as follows by the weight proportion of moisture in the hybrid fuel：(quality is aqueous for moisture content
Rate, similarly hereinafter) ＜ 15% accounts for 10%~30%, and 15%≤moisture content≤70% accounts for 70%~90%.
It illustrates, considered based on actual conditions, the content of each biomass components has included being mixed in wherein in the present invention
A small amount of soil, the impurity that is difficult to avoid that such as sand.
The efficient resistive connection slag biomass composite fuel of the present invention is produced by biomass components and lime-ash through conventional biomass fuel
Technique (such as broken, screening, mixing) is made, and is sold after the biomass fuel is plastic, can not also be molded and be sent directly into biology
It is used in matter fuel boiler.Advantage is as follows：
1) the efficient resistive connection slag biomass composite fuel of the present invention, is not spiked with fossil fuel, does not also add resistive connection slag agent, but
It mixes and matches certain proportion boiler ash.There are three effects for the component, first, uniformly transfer heat can be played the role of in combustion,
So that the temperature in entire burner hearth is reached suitable heat distribution, improves the thermal efficiency of biomass fuel boiler；Second is that boiler ash
Fusing point is higher, in boiler under the action of fluidized wind, washes away boiler water wall and other heating devices, prevents biomass lime-ash viscous
It is attached on water-cooling wall and other heating devices, avoids slagging on water-cooling wall and other heating devices；Third, boiler ash and biology
The alkali metal compound etc. generated after matter burning forms dystectic double salt, further decreases the slagging amount in boiler.
2) boiler ash is the clinker of typical coal-fired boiler, does not increase cost substantially.
3) biomass composite fuel can prevent the heating devices slagging such as biomass boiler water-cooling wall, its burning is made to generate
Even heat distribution burner hearth in, improve efficiency of combustion of the biomass fuel in circulating fluidized bed boiler, make biomass energy
Utilization rate higher, the thermal efficiency higher of boiler, and improve the service life of circulating fluidized bed boiler.
4) can each component ratio further be determined according to the density of each component, grain size, moisture and calorific value, make density it is big,
The big part of grain size is burnt in middle and lower part, and intermediate density and medium grain size burn at middle part, low-density, small particle on top
Burning, thus makes the uniform heat distribution in entire burner hearth, forms the temperature field in furnace having levels and continuous reciprocal benign follows
Ring.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail.
It since resistive connection slag effect is difficult to direct measuring, therefore is characterized indirectly with the stoppage in transit cleaning cycle of boiler scaling, as a result
May due to the difference of specific boiler difference.
Comparative example 1~3
Comparative example be the prior art biomass fuel, ingredient, particle diameter distribution, porous media referring to table 1. wherein,
Straw, peanut shell content are up to 70% in comparative example 1, since rice husk and K, Na equal size in peanut shell are higher, in boiler internal combustion
The compound that fusing point is less than in-furnace temperature is generated after burning, being easily adhered to stove inner wall etc. leads to slagging, makes boiler heat-transfer efficiency
It reduces, and in-furnace temperature is caused to be unevenly distributed, or even the booster caused by hot-spot, when actually using the biomass fuel only
Clinker need to just be cleared up within 1 week or so.Raw material proportioning is improved in comparative example 2, but clogging problems, still than more serious, boiler scaling is clear
It is 2 weeks to manage the period.To solve clogging problems in comparative example 3, yellow sand is added, souring of the yellow sand in stove is to a certain extent
Slagging is reduced, boiler scaling cleaning cycle extends to 3 weeks.
Embodiment 1~11
Each component is subjected to dispensing according to moisture content, particle diameter distribution, proportioning according to the numerical value given in table 1~2, through broken
Biomass fuel is made in the processes such as broken, screening, mixing.Due to adding 1%~4% boiler ash, while reasonably matching
Reaction in furnace situation is improved than, particle diameter distribution and dry and wet dispensing, slagging phenomenon is made to be effectively controlled, boiler scaling cleaning week
Phase extends to 4 weeks or more.
Table 1
Table 2
Explanation：Blank cell is indicated without corresponding component in table 1, table 2；Number in grain size, moisture content right sided cell lattice
Value is to fall the synthesis ratio of the biomass fuel in given range.
Claims (10)
1. a kind of resistive connection slag biomass composite fuel for circulating fluidized bed boiler, including the wooden leftover pieces, bamboo leftover pieces, straw
At least two in stalk, bark, fuel wood, rice husk, peanut shell, broken branch, it is characterised in that：Further include boiler ash, the pot
Boiler ash sediment is the clinker of coal-burning boiler, wherein the mass percent of each key component is：SiO2：37 ~ 50%, Al2O3：28 ~ 40%,
Fe2O3：4 ~ 20%, CaO：1~8%；In the boiler ash, mass fraction >=90% of the grain size in 3mm lime-ash below；The pot
The quality of boiler ash sediment accounts for the 1% ~ 4% of hybrid fuel gross mass；The overall particle size mass percent distribution of the hybrid fuel is as follows：
Grain size ＜ 5mm account for 20% ~ 40%, 5mm≤grain size≤50mm account for 30% ~ 50%, 50mm ＜ grain sizes≤200mm account for 10% ~ 30%.
2. the resistive connection slag biomass composite fuel according to claim 1 for circulating fluidized bed boiler, which is characterized in that
The mass percent of each key component is in the boiler ash：SiO2：40 ~ 45%, Al2O3：30 ~ 37%, Fe2O3：15 ~ 20%,
CaO：1~5%.
3. the resistive connection slag biomass composite fuel according to claim 1 for circulating fluidized bed boiler, which is characterized in that
The constituent mass percentage of the hybrid fuel is：The wooden leftover pieces：10% ~ 20%, stalk：25% ~ 40%, bark：15% ~ 25%, firewood
Bavin：18% ~ 25%, rice husk or peanut shell：5% ~ 15%, boiler ash：1% ~ 3%, other components：≤15%；The other components are reed
One or several kinds in reed slag, sawdust, mushroom base, tree root, velveteen, broken branch, pinecone ball.
4. the resistive connection slag biomass composite fuel according to claim 3 for circulating fluidized bed boiler, which is characterized in that
The constituent mass percentage of the hybrid fuel is：The wooden leftover pieces：15%, stalk：30%, bark：18%, fuel wood：20%, rice husk：
5%, boiler ash：2%, other components：10%；The other components are reed slag, sawdust, mushroom base, tree root, velveteen, broken tree
One or several kinds in branch, pinecone ball.
5. the resistive connection slag biomass composite fuel according to claim 1 for circulating fluidized bed boiler, which is characterized in that
The constituent mass percentage of the hybrid fuel is：The wooden leftover pieces：10% ~ 15%, stalk：15% ~ 20%, bark：10% ~ 15%, firewood
Bavin：15% ~ 20%, rice husk or peanut shell：15% ~ 20%, boiler ash：1% ~ 3%, bamboo leftover pieces：15% ~ 25%, reed slag：9%~
15%, other components：≤5%；The other components be sawdust, mushroom base, tree root, velveteen, broken branch, one kind in pinecone ball or
It is several.
6. the resistive connection slag biomass composite fuel according to claim 1 for circulating fluidized bed boiler, which is characterized in that
The constituent mass percentage of the hybrid fuel is：The wooden leftover pieces：10% ~ 15%, stalk：25% ~ 40%, bark：10% ~ 25%, firewood
Bavin：10% ~ 20%, rice husk or peanut shell：5% ~ 15%, boiler ash：1% ~ 3%, mushroom base：5% ~ 15%, other components：5%~10%；
The other components are the one or several kinds in reed slag, sawdust, tree root, velveteen, broken branch, pinecone ball.
7. the resistive connection slag biomass composite fuel according to claim 1 for circulating fluidized bed boiler, which is characterized in that
The constituent mass percentage of the hybrid fuel is：The wooden leftover pieces：20%, stalk：25%, bark：15%, rice husk：10%, Boiler Ash
Slag：2%, bamboo leftover pieces：18%, mushroom base：5%, sawdust：5%.
8. the resistive connection slag biomass composite fuel according to claim 1 for circulating fluidized bed boiler, which is characterized in that
The constituent mass percentage of the hybrid fuel is：The wooden leftover pieces：25%, straw：15%, cornstalk：15%, fuel wood：25%, rice
Shell：5%, boiler ash：1.5%, tree root：3.5%, velveteen：5%, pinecone ball：5%.
9. according to the resistive connection slag biomass composite fuel any one of claims 1 to 8 for circulating fluidized bed boiler,
It is characterized in that, the overall particle size mass percent distribution of the hybrid fuel is as follows：Grain size ＜ 5mm's accounts for 30% ~ 40%, 5mm
≤ grain size≤50mm account for 40% ~ 50%, 50mm ＜ grain sizes≤200mm account for 10% ~ 30%.
10. according to the resistive connection slag biomass composite fuel any one of claims 1 to 8 for circulating fluidized bed boiler,
It is characterized in that, each component is as follows by the weight proportion of moisture in the hybrid fuel：Moisture content ＜ 15% account for 10% ~
30%, 15%≤moisture content≤70% accounts for 70% ~ 90%.
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| CN106544072A (en) * | 2016-11-04 | 2017-03-29 | 黄山锦富生物能源有限公司 | A kind of biological granular fuel with bamboo as major ingredient |
| CN107062277A (en) * | 2017-02-15 | 2017-08-18 | 上海浦东路桥建设股份有限公司 | Improve method and medicament that biomass boiler stains corrosion |
| CN107400544A (en) * | 2017-07-14 | 2017-11-28 | 铜陵启汇新型能源有限公司 | A kind of resistive connection slag high heating value biomass barred body fuel and preparation method thereof |
| CN107365609B (en) * | 2017-07-14 | 2019-05-21 | 铜陵启汇新型能源有限公司 | A kind of biomass barred body fuel and preparation method thereof with excellent resistive connection slag |
| CN107916153A (en) * | 2017-11-22 | 2018-04-17 | 成都新柯力化工科技有限公司 | A kind of biomass clean fuel slug and preparation method |
| CN108329968A (en) * | 2018-02-05 | 2018-07-27 | 黄山容宇五金制品有限公司 | A kind of high-efficiency scobs based biomass particle and preparation method thereof |
| CN109054918B (en) * | 2018-08-23 | 2020-03-10 | 济南玮泉生物发电有限公司 | Blending method of biomass fuel containing large proportion of yellow stalks |
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| WO2009139621A1 (en) * | 2008-05-14 | 2009-11-19 | Meneba B.V. | Wood fuels having improved fuel ash properties, and their preparation |
| CN102533372A (en) * | 2012-01-10 | 2012-07-04 | 王玉森 | Briquettes produced by using recovered material discharged from industrial boilers as raw material and production method thereof |
| CN103382408A (en) * | 2012-05-03 | 2013-11-06 | 黔东南州龙达再生能源开发有限责任公司 | Straw coal fuel technology |
| CN103351094A (en) * | 2013-06-25 | 2013-10-16 | 天津大学 | Slagging resistance method for mixed burning of biomass and sludge |
| CN104673422A (en) * | 2013-11-29 | 2015-06-03 | 沈攀攀 | Biochar fuel |
| CN104059708B (en) * | 2014-01-23 | 2016-03-30 | 江山华隆能源开发有限公司 | A kind of resistive connection slag biomass solid particle fuel |
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