CN101775324A - Biomass solid formed fuel anti-slagging additive and preparation method thereof - Google Patents
Biomass solid formed fuel anti-slagging additive and preparation method thereof Download PDFInfo
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- CN101775324A CN101775324A CN 201010130394 CN201010130394A CN101775324A CN 101775324 A CN101775324 A CN 101775324A CN 201010130394 CN201010130394 CN 201010130394 CN 201010130394 A CN201010130394 A CN 201010130394A CN 101775324 A CN101775324 A CN 101775324A
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Abstract
The invention discloses a biomass solid formed fuel anti-slagging additive and a preparation method thereof, which belongs to the technical field of renewable energy sources and is used for solving the problems that straw biomass solid formed fuel has high alkali metal content, is slagged in the combustion process and the like. The anti-slagging additive mainly comprises 15% to 25% of magnesium carbonate, 20% to 30% of alumina and 45% to 65% of the calcium carbonate, different formula ratio is made according to different biomass raw materials; and the anti-slagging additive is added into different biomass raw materials according to the proportion of 1% to 5%. The preparation method comprises the following steps: the calcium carbonate is firstly put into a special container, the container keeps dry, then alumina is added, finally the magnesium carbonate is added, the mixture is ground and evenly mixed for 10 to 15 minutes with the grinding particle size less than 1 mm, and then a finished product is obtained. The additive can solve the problem of slagging in the combustion process of the formed fuel and increases the combustion efficiency of the formed fuel.
Description
Technical field
A kind of biomass solid formed fuel anti-slagging additive and preparation method, belong to field of renewable energy technology, specifically be that magnesiumcarbonate, aluminum oxide and the lime carbonate mixing of different content are added in the biomass material, be used to solve stalk biomass solid molding fuel alkali metal content height, problem such as slagging scorification in combustion processes.
Background technology
China has the abundant agricultural straw resource and the forest reserves, and the farm crop annual production is annual about 600,000,000 tons according to statistics, amounts to 300,000,000 tons of standard coals approximately, about 1.5 hundred million tons of forestry residuum.In recent years, along with improving constantly of rural economy level, life in the countryside increases gradually with high-grade commercial energy resource in the energy, the shared ratio of stalk is also increasing, a large amount of depleted stalks are burned in the field, this phenomenon is not only wasted a large amount of biomass energies, and environment is caused severe contamination.The biomass solid formed fuel technology is under certain temperature and pressure effect, original dispersive, the biomass drying that does not have definite shape and pulverizing are pressed into the new and high technology with various shaped fuels definite shape, that density is bigger, 6～8 times of volume-diminished, density are 1.0～1.4t/m
3, energy resource density is equivalent to middle matter bituminous coal, and firepower is lasting during use, the fire box temperature height, combustioncharacteristics obviously is improved, and both can be used as urban residents' cooking and heating fuel, also can be used as the fuel in urban region heat supply and power station, more and more get more and more people's extensive concerning in recent years.
But inorganic elements (comprises K in the stalk biomass raw material, Na, Cl, S, Ca, Si, P etc.) content is higher, caused biomass solid formed fuel fouling, slagging scorification phenomenon to occur in thermochemistry trans-utilization process, not only the thermal characteristics to combustion equipment impacts, and jeopardizes combustion equipment safety.All than higher, Cl almost completely evaporates in the combustion processes as the content of Cl element in the stalk, forms HCl, Cl
2And alkali metal chloride.Along with flue-gas temperature reduces, alkali and alkali metal chloride are condensate on fly ash granule or the heat exchanger surface, form vitriol with smoke reaction, and discharge muriate.Muriate has active oxidation capacity, increases high temperature corrosion speed and metal loss speed, reduces heat transfer efficiency, even can make the localized heat transfer surface lose heat transfer property.Therefore the stalk biomass shaped fuel will add the agent of resistive connection slag in combustion processes, to reduce slagging scorification, improves combustioncharacteristics.
At present for improving ratio of briquetting, before raw material entered shaper, with interpolation part binding agent, this had improved ratio of briquetting, but had produced problem such as burning slagging scorification.As in this patent of patent No. CN101220310A (applying date 2007.1.10), proposing, for increasing the viscosity of shaped fuel, in moulding process, add binding agents such as honey, amylan, clay, tar, this has improved the production cost of fuel undoubtedly, and clay, pitch etc. are made binding agent etc. and also can be made forming composition burning slagging scorification serious, burning is produced certain negative impact, and contaminate environment.Have some articles, patent to propose to increase additive in addition, the ash fusion point when reducing burning reduces slagging scorification.As at " a kind of biomass solid forming fuel additive " (patent No. CN101550374A, applying date 2009.5.13) proposing additive in is made up of aluminum oxide, ferric oxide and kaolin, the ferric oxide fusing point is at 1565 ℃, sometimes temperature will reach 1500 ℃ in combustion processes, therefore can cause slagging scorification easilier, therefore the additive that proposes in this patent can solve the slagging scorification problem in the combustion processes, but sometimes can cause more lime-ash, can produce toxic gas simultaneously, cause secondary pollution.
Summary of the invention
The objective of the invention is, be to provide a kind of biomass solid formed fuel anti-slagging additive and preparation method, can solve stalk biomass solid molding fuel slagging scorification problem in combustion processes, improve efficiency of combustion and shaped fuel ash fusion point.Adopt the present invention can reduce pollutant emission simultaneously, avoid causing secondary pollution, promote applying of biomass solid formed fuel, solve farm energy problem, improve rural environment.
For reaching the technical scheme that this purpose takes be, biomass solid formed fuel anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 15%～25% magnesiumcarbonate, 20%～30% aluminum oxide and 45%～65% by weight percentage, and according to 1%～5% ratio anti-slagging additive is added in the different biomass materials.
Above-mentioned a kind of biomass solid formed fuel anti-slagging additive and preparation method, anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 15% magnesiumcarbonate, 20% aluminum oxide and 65% by weight percentage, and anti-slagging additive is added in the different biomass materials according to 2% ratio, this anti-slagging additive calcium carbonate content is the highest, magnesiumcarbonate is minimum, adding proportion is minimum, anti-clinkering property is general, is used for the less biomass molding fuel of combustion processes slagging scorification.
Above-mentioned a kind of biomass solid formed fuel anti-slagging additive and preparation method, anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 20% magnesiumcarbonate, 25% aluminum oxide and 55% by weight percentage, and anti-slagging additive is added in the different biomass materials according to 3.5% ratio, this anti-slagging additive calcium carbonate content is higher, magnesiumcarbonate is less, adding proportion is general, anti-clinkering property is better, is used for the more biomass molding fuel of combustion processes slagging scorification.
Above-mentioned a kind of biomass solid formed fuel anti-slagging additive and preparation method, anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 25% magnesiumcarbonate, 30% aluminum oxide and 45% by weight percentage, and anti-slagging additive is added in the different biomass materials according to 5% ratio, this anti-slagging additive calcium carbonate content is minimum, magnesiumcarbonate is the highest, the ratio of adding is the highest, resistive connection slag ability is the strongest, is used for the maximum biomass molding fuel of combustion processes slagging scorification.
Above-mentioned a kind of biomass solid formed fuel anti-slagging additive and preparation method, the preparation method of anti-slagging additive carries out as follows:
(1) lime carbonate is proportionally put into special exsiccant mixing tank;
(2) again aluminum oxide is proportionally put into, carried out uniform mixing 10～15 minutes;
(3) at last magnesiumcarbonate is proportionally put into, carried out uniform mixing again 10～15 minutes, get product.
Above-mentioned a kind of biomass solid formed fuel anti-slagging additive and preparation method, the mixed granularity of magnesiumcarbonate, aluminum oxide and lime carbonate are less than 1 millimeter, to guarantee and the biomass material thorough mixing.
It is the biomass solid formed fuel of raw material production that anti-slagging additive of the present invention can be used for forestry residuums such as agricultural crop straw such as corn, wheat, paddy rice, cotton and Korean pine, tamarack, and the beneficial effect that adopts above-mentioned technical solution to reach is:
Magnesiumcarbonate in the anti-slagging additive of the present invention, aluminum oxide and lime carbonate in combustion processes can with basic metal generation chemical reactions such as silicon in the stalk, potassium, sodium, produce dystectic material, improved the ash fusion point of whole shaped fuel, therefore in combustion processes, solved the slagging scorification problem, guarantee the burning cmpletely of shaped fuel simultaneously, improved efficiency of combustion.Anti-slagging additive of the present invention can react with HCl gas, and with the form release of chlorine with HCl gas, thereby the massfraction of soluble chloride in the minimizing settling, the corrosion speed of reduction heat exchange metal covering, reduce the pollutant emission in the ash content in addition, avoided secondary pollution.
Embodiment:
A kind of biomass solid formed fuel anti-slagging additive and preparation method, the magnesiumcarbonate of anti-slagging additive main 15%～25%, 20%～30% aluminum oxide and 45%～65% lime carbonate are formed, and formulate different formulation ratios according to different biomass materials; And anti-slagging additive is added in the different biomass materials according to 1%～5% ratio.
Its preparation method is: at first lime carbonate is put into handtailor container, keep the container drying, put into aluminum oxide again and carried out uniform mixing 10～15 minutes, put into the magnesiumcarbonate uniform mixing at last 10～15 minutes, get product, in the blended process, to guarantee the container drying, guarantee that simultaneously mixed granularity is less than 1 millimeter.
Biomass molding fuel is slagging scorification easily in combustion processes, the clinkering rate difference of different fuel, and clinkering rate is measured and method of calculation are: get a kind of test biomass molding fuel, in the burner internal combustion, after the burning bottom ash is all taken out, claim quality and be designated as m
1, granularity claims quality and is designated as m greater than the clinker of 6mm in the screening lime-ash
2, then granularity accounts for the percentage ratio of total lime-ash quality greater than the clinker of 6mm, is called the bottom ash slagging scorification quality rate C of this sample, i.e. C=m
2/ m
1* 100%.
Combustion test result shows that the metal content in clinkering rate and the stalk has substantial connection, and the Si constituent content is high more, and slagging trend is obvious more, as corn stalk, Korean pine etc., about 25% or higher, slagging trend is higher substantially for its Si content, tamarack Si content only is 9.76%, and its slagging trend is also low.Alkali metal (K, Na) and alkali earth metal (Ca, Mg) are also very big to the influence of bottom ash clinkering rate, the content of corn stalk K element is higher, as cotton stalk and wheat straw, both Si constituent contents are roughly the same, but the K constituent content of wheat straw is up to 14.17%, and its bottom ash clinkering rate is also than cotton stalk height.Therefore the present invention is divided three classes the ratio of anti-slagging additive according to heterogeneity according to the metal element content of different stalks and the slagging scorification situation after the burning, and specific embodiment is as follows:
Embodiment 1: biomass solid formed fuel anti-slagging additives such as cotton stalk, tamarack
At cotton stalk, raw materials such as tamarack contain lower Si element and other alkali metal element, Si content is substantially below 10%, the K constituent content is about 4%, burning back clinkering rate is lower, this anti-slagging additive is mainly used in the combustioncharacteristics that improves shaped fuel, therefore be used for straw, the anti-slagging additive of biomass solid formed fuels such as tamarack is by weight percentage by 15% magnesiumcarbonate, 20% aluminum oxide and 65% lime carbonate uniform mixing in special drying receptacle is formed, and according to 2% ratio anti-slagging additive is added in the different biomass materials.The burning back is compared with control group (additive-free) the fuel ash analysis, and wherein the clinkering rate of cotton stalk granular fuel drops to 6% by 23%, and ash fusion point reaches 1250 ℃; The clinkering rate of tamarack stalk granular fuel drops to 0 by 8%, the slagging scorification phenomenon do not occur, and ash fusion point reaches 1485 ℃.Efficiency of combustion has improved about 10%.
Embodiment 2: biomass solid formed fuel anti-slagging additives such as straw, rice straw
Contain general high Si element and other alkali metal element at raw materials such as straw, rice straws, Si content is substantially 20%, the K constituent content is about 10%, burning back clinkering rate is higher, therefore the anti-slagging additive that is used for biomass solid formed fuels such as straw, rice straw is made up of lime carbonate uniform mixing in special drying receptacle of 20% magnesiumcarbonate, 25% aluminum oxide and 55% by weight percentage, and according to 3.5% ratio anti-slagging additive is added in the different biomass materials.The burning back is compared with control group (additive-free) the fuel ash analysis, and wherein the clinkering rate of straw granular fuel drops to 10% by 36%, and ash fusion point reaches 1280 ℃; The clinkering rate of rice straw granular fuel drops to 4% by 25%, does not occur slagging scorification basically, and ash fusion point reaches 1325 ℃.Efficiency of combustion has improved about 5%.
Embodiment 3: biomass solid formed fuel anti-slagging additives such as maize straw, Korean pine
Contain higher Si element and other alkali metal element at raw materials such as maize straw, Korean pines, Si content is substantially 25%, the K constituent content is 15%, burning back clinkering rate is the highest, therefore the anti-slagging additive that is used for biomass solid formed fuels such as maize straw, Korean pine is mixed by the lime carbonate of 25% magnesiumcarbonate, 30% aluminum oxide and 45% by weight percentage, adds according to 5% of raw materials such as maize straw, Korean pine and uses.The burning back is compared with control group (additive-free) the fuel ash analysis, and wherein the clinkering rate of Korean pine granular fuel drops to 13% by 51%, and ash fusion point reaches 1500 ℃; The clinkering rate of corn stalk pellets fuel drops to 15.2% by 48.9%, and ash fusion point reaches 1350 ℃.Efficiency of combustion has improved about 6%.
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each specific embodiments of tool.
It should be noted that at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (6)
1. biomass solid formed fuel anti-slagging additive and preparation method, it is characterized in that this anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 15%～25% magnesiumcarbonate, 20%～30% aluminum oxide and 45%～65% by weight percentage, and anti-slagging additive is added in the different biomass materials according to 1%～5% ratio.
2. a kind of biomass solid formed fuel anti-slagging additive according to claim 1 and preparation method, it is characterized in that this anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 15% magnesiumcarbonate, 20% aluminum oxide and 65% by weight percentage, and anti-slagging additive is added in the different biomass materials according to 2% ratio.
3. a kind of biomass solid formed fuel anti-slagging additive according to claim 1 and preparation method, it is characterized in that this anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 20% magnesiumcarbonate, 25% aluminum oxide and 55% by weight percentage, and anti-slagging additive is added in the different biomass materials according to 3.5% ratio.
4. a kind of biomass solid formed fuel anti-slagging additive according to claim 1 and preparation method, it is characterized in that this anti-slagging additive is made up of lime carbonate uniform mixing in special drying receptacle of 25% magnesiumcarbonate, 30% aluminum oxide and 45% by weight percentage, and anti-slagging additive is added in the different biomass materials according to 5% ratio.
5. a kind of biomass solid formed fuel anti-slagging additive according to claim 1 and preparation method is characterized in that the preparation method of this anti-slagging additive carries out as follows:
(1) lime carbonate is proportionally put into special exsiccant mixing tank;
(2) again aluminum oxide is proportionally put into, carried out uniform mixing 10～15 minutes;
(3) at last magnesiumcarbonate is proportionally put into, carried out uniform mixing again 10～15 minutes, get product.
6. a kind of biomass solid formed fuel anti-slagging additive according to claim 1 and preparation method, the mixed granularity that it is characterized in that magnesiumcarbonate, aluminum oxide and lime carbonate is less than 1 millimeter.
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| CN102041130A (en) * | 2010-12-27 | 2011-05-04 | 华东理工大学 | Method for improving biomass ash fusion point |
| CN102277218A (en) * | 2011-07-08 | 2011-12-14 | 唐东波 | Inhibitor for preventing straw shaping material from coking |
| CN102851096A (en) * | 2012-10-17 | 2013-01-02 | 济南宝华新能源技术有限公司 | Processing method of biomass solid formed fuel |
| CN104059709A (en) * | 2014-01-23 | 2014-09-24 | 江山华隆能源开发有限公司 | Preparation method of anti-slagging biomass solid granular fuel |
| CZ304964B6 (en) * | 2012-06-11 | 2015-02-11 | Vysoká škola chemicko - technologická v Praze | Method of preventing caking of biomass fuel by the addition of additive |
| CN105542896A (en) * | 2016-03-07 | 2016-05-04 | 临沂大学 | Biomass granule fuel taking marine microalgae as main raw material and production method of biomass granule fuel |
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| WO2020091296A1 (en) * | 2018-10-30 | 2020-05-07 | 주식회사 블루오션 산업 | Additive composition using alumina for preventing fouling, slagging, and corrosion of biomass co-firing or dedicated boiler |
| CN111548840A (en) * | 2020-04-24 | 2020-08-18 | 宁波市北仑环保固废处置有限公司 | Special coking inhibitor for hazardous waste incinerator and preparation method and application thereof |
| CZ309396B6 (en) * | 2021-06-30 | 2022-11-16 | Lam An Investment Join Stock Company | Rice straw fuel |
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Application publication date: 20100714 |