CN105021776B - A kind of decision method of biomass boiler silicate slagging trend - Google Patents
A kind of decision method of biomass boiler silicate slagging trend Download PDFInfo
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Abstract
The present invention discloses a kind of decision method of biomass boiler silicate slagging trend, and the fuel and available fuel currently used to biomass electric power plant carries out ash component analysis, determines SiO in all kinds of fuel ashes2、Al2O3And K2The mass fraction of O, and SiO2/K2O、SiO2/Al2O3(SiO2+K2O)/Al2O3With three parameter values；On the basis of the currently used fuel of power plant, SiO is considered2、Al2O3And K2Reciprocation between each single component effects of O and heterogeneity, obtains the evaluation criterion to biomass boiler silicate slagging trend under the conditions of different fire box temperatures, instructs biomass fuel to select and combination collocation.This method can provide reference for the selection of biomass Power Plant Fuel and combination collocation, alleviate biomass boiler Slagging, simple and easy to apply and economy.
Description
【Technical field】
The invention belongs to field of renewable energy, it is related to a kind of decision method of biomass boiler silicate slagging trend.
【Background technology】
Biomass energy is used as CO2The clean reproducible energy of zero-emission, its application receives increasingly extensive concern.According to
China《Regenerative resource Long-and Medium-term Development is planned》, 30000MW is up to the year two thousand twenty China biomass power generation total installation of generating capacity.
However, biomass fuel faces the clogging problems of sternness due to high basic metal content and low grey melt temperature in its application.Boiler
Slagging scorification can cause heating surface high temperature corrosion and heat-transfer capability to decline, and influence biomass electric power plant safe operation and economy.Research table
Bright, the melting behavior of ash is notable on biomass combustion slagging scorification influence in combustion process.Occur according to the melting phenomenon of slagging scorification is caused
Temperature conditionss it is different, " slagging scorification of high temperature silicate " that is caused by the melting of high-melting-point silicoaluminate can be divided into and by low melting point silicon
" slagging scorification of low temperature silicate " that acid potassium salt melting is caused.
At present, the method such as the pretreatment such as the sial such as kaolin system additive, washing and the mixed combustion of biomass be used to improve
Slagging.The Chinese patent of Application No. 201310034824.6 discloses a kind of biomass fuel anti-coking additive, adds
It is plus agent is mainly made up of 20~30% aluminum oxide, 15~30% magnesium carbonate and 40~65% calcium oxide and former according to biomass
2~8% additions of material gross weight are used, and help to lift fuel ash fusion point, alleviate clogging problems；Application No.
A kind of method that 201310258218.2 Chinese patent provides biomass and sludge mixed combustion resistive connection slag, sludge addition wadding
Solidifying agent carries out flocculation concentration treatment, and the sludge addition CaO adjusting materials after concentration carry out dewater treatment, and the sludge after dehydration is through dry
Burned after mixing with biomass after dry, crushing, solve to realize that recycling sludge is utilized while biomass combustion process slagging scorification.
Though above method can to a certain extent alleviate the clogging problems during biomass combustion, in practical application into
The problems such as this control and consumption are selected still needs further research, and method large-scale application is there is no at present.Therefore, it is still necessary to from
Fuel is started with itself, and its ash deposition propensity is judged, optimization fuel is selected and combination collocation.
【The content of the invention】
It is an object of the invention to provide a kind of decision method of biomass boiler silicate slagging trend, for judging life
Biomass fuel silicate slagging trend, and then instruct selection and the combination collocation of biomass fuel.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：
A kind of decision method of biomass boiler silicate slagging trend, comprises the following steps：Burning two kinds of biomass of A, B
Fuel obtains two kinds of biomass ashs of A, B, then carries out constituent analysis, obtains K2O、SiO2And Al2O3Account for the quality hundred of biomass ash
Fraction：K2O(A)、K2O(B)、SiO2(A)、SiO2(B)、Al2O3(A)、Al2O3(B)；Judge that fuel silicate slagging scorification becomes according to following steps
Gesture：
1) to two kinds of biomass ashs of A, B, if meeting K2O(A)>K2O(B), SiO2(A)>SiO2(B), Al2O3(A)<Al2O3(B), sentence
Disconnected silicate ash deposition propensity：A>B；
If 2) K2O(A)>K2O(B), but SiO2(A)<SiO2(B), then [SiO2/K2O](A)<[SiO2/K2O](B)If, simultaneously
Al2O3(A)<Al2O3(B), judge silicate ash deposition propensity：A>B；If Al2O3(A)>Al2O3(B), and then consider (SiO2+K2O)/
Al2O3If, [(SiO2+K2O)/Al2O3](A)>[(SiO2+K2O)/Al2O3](B), judge silicate ash deposition propensity：A>B；If otherwise
[(SiO2+K2O)/Al2O3](A)＜ [(SiO2+K2O)/Al2O3](B)Then there is silicate ash deposition propensity：A<B；
If 3) meet K2O(A)>K2O(B), SiO2(A)>SiO2(B), Al2O3(A)>Al2O3(B), and then consider SiO2/Al2O3Value, if
[SiO2/Al2O3](A)>[SiO2/Al2O3](B), judge silicate ash deposition propensity：A>B；If [SiO2/Al2O3](A)<[SiO2/
Al2O3](B), and then consider (SiO2+K2O)/Al2O3If, [(SiO2+K2O)/Al2O3](A)>[(SiO2+K2O)/Al2O3](B), judge
Silicate ash deposition propensity：A>B；If otherwise [(SiO2+K2O)/Al2O3](A)＜ [(SiO2+K2O)/Al2O3](B)Then there is silicate knot
Slag is inclined to：A<B；
Wherein：
K2O(A)Represent K in A biomass ashs2The mass percent of O；
K2O(B)Represent K in B biomass ashs2The mass percent of O；
SiO2(A)Represent SiO in A biomass ashs2Mass percent；
SiO2(B)Represent SiO in B biomass ashs2Mass percent；
Al2O3(A)Represent Al in A biomass ashs2O3Mass percent；
Al2O3(B)Represent Al in B biomass ashs2O3Mass percent；
[SiO2/K2O](A)Represent SiO2(A)With K2O(A)Ratio；
[SiO2/K2O](B)Represent SiO2(B)With K2O(B)Ratio；
[(SiO2+K2O)/Al2O3](A)Represent SiO2(A)With K2O(A)Sum and Al2O3(A)Ratio；
[(SiO2+K2O)/Al2O3](B)Represent SiO2(B)With K2O(B)Sum and Al2O3(B)Ratio；
[SiO2/Al2O3](A)Represent SiO2(A)With Al2O3(A)Ratio；
[SiO2/Al2O3](B)Represent SiO2(B)With Al2O3(B)Ratio.
According to two kinds of biomass fuel silicate ash deposition propensity results of A, B, fuel type selecting and the combination of boiler of power plant are carried out
Collocation.
Two kinds of biomass fuels of A, B include fuel combination, the single-fuel addition that single-fuel, various single-fuels are constituted
Denatured fuel or fuel combination after additive add the denatured fuel after additive.
The present invention fuel currently used to biomass electric power plant and available fuel carry out constituent analysis, determine all kinds of combustions
SiO in material2、Al2O3And K2The mass fraction of O, and SiO2/K2O、SiO2/Al2O3(SiO2+K2O)/Al2O3With three parameters
Value.On the basis of the currently used fuel of power plant, SiO is considered2、Al2O3And K2Between each single component effects of O and heterogeneity
Reciprocation, obtain to the evaluation criterion of biomass boiler silicate slagging trend under the conditions of different fire box temperatures, instruct life
Biomass fuel is selected and combination collocation.It is specific as follows：
1) pluralities of fuel is two-by-two compared to (being single-fuel, the fuel combination after various single-fuels composition, and addition
Denatured fuel after additive), if the K containing higher amount in certain biomass fuel ash2O and SiO2, and lower loading
Al2O3, can determine whether that this kind of biomass ash deposition propensity is of a relatively high；
If 2) K in the biomass ash2O content is high but SiO2Content is lower, then the biomass have relatively low SiO2/K2O
Value, if Al simultaneously2O3Content is lower, can determine whether that the biomass ash deposition propensity is of a relatively high；If Al2O3Content is higher, then and then examine
Consider (SiO2+K2O)/Al2O3Value, if (SiO2+K2O)/Al2O3Value is of a relatively high, can determine whether the biomass ash deposition propensity relatively
Height, on the contrary then think that ash deposition propensity is relatively low；
If 3) K in the biomass ash2O、SiO2And Al2O3Content is higher, then so that consider SiO2/Al2O3Value, if SiO2/
Al2O3Value is high, can determine whether that the biomass ash deposition propensity is of a relatively high；If SiO2/Al2O3Value it is low, then so consider (SiO2+K2O)/
Al2O3Value, as biomass (SiO2+K2O)/Al2O3Value is high, can determine whether that the biomass ash deposition propensity is of a relatively high, otherwise then think
Ash deposition propensity is relatively low.
A kind of silicate slagging trend of biomass fuel is may determine that based on above approach, so as to carry out reasonable selection and
Combination collocation.
Relative to prior art, the invention has the advantages that：
1st, the present invention is for the more serious present situation of biomass boiler slagging scorification situation, there is provided biomass boiler silicate knot
The determination methods of slag trend, to being selected and combination collocation by fuel, and then alleviation Slagging has great importance；
2nd, ash deposition propensity judgement is carried out present invention is primarily based on the silicon in biomass fuel, aluminium and Determination of Potassium, it is easy
It is easy and applied widely；
3rd, the present invention is based on the currently used fuel of power plant, and fuel selection and combination collocation, nothing are optimized according to judged result
A large amount of ancillary costs are needed, with feasibility and economy higher.
【Brief description of the drawings】
Fig. 1 is a kind of flow chart of the decision method of biomass boiler silicate slagging trend of the invention.
【Specific embodiment】
Below in conjunction with the accompanying drawings with application example, the present invention is described in further detail.
Fig. 1 is referred to, a kind of decision method of biomass boiler silicate slagging trend of the invention represents two kinds with A, B
The biomass that boiler of power plant can be used, by after ash component analysis, sentencing to silicate slagging trend according to below scheme
Not.
A kind of decision method of biomass boiler silicate slagging trend of the present invention, comprises the following steps：Two kinds of A, B of burning
Biomass obtain two kinds of biomass ashs of A, B, then carry out constituent analysis, obtain K2O、SiO2And Al2O3Account for the quality of biomass ash
Percentage.Wherein：
K2O(A)Represent K in A biomass ashs2The mass percent of O；
K2O(B)Represent K in B biomass ashs2The mass percent of O；
SiO2(A)Represent SiO in A biomass ashs2Mass percent；
SiO2(B)Represent SiO in B biomass ashs2Mass percent；
Al2O3(A)Represent Al in A biomass ashs2O3Mass percent；
Al2O3(B)Represent Al in B biomass ashs2O3Mass percent；
If 1) meet K to two kinds of biomass ashs of A, B2O(A)>K2O(B), SiO2(A)>SiO2(B), Al2O3(A)<Al2O3(B), can sentence
Disconnected silicate ash deposition propensity：A>B；
If 2) K2O(A)>K2O(B), but SiO2(A)<SiO2(B), then [SiO2/K2O](A)<[SiO2/K2O](B)If, simultaneously
Al2O3(A)<Al2O3(B), can determine whether silicate ash deposition propensity：A>B；If Al2O3(A)>Al2O3(B), and then consider (SiO2+K2O)/
Al2O3If, [(SiO2+K2O)/Al2O3](A)>[(SiO2+K2O)/Al2O3](B), can determine whether silicate ash deposition propensity：A>B；Otherwise
If [(SiO2+K2O)/Al2O3](A)＜ [(SiO2+K2O)/Al2O3](B)Then there is silicate ash deposition propensity：A<B.
If 3) meet K to two kinds of biomass ashs2O(A)>K2O(B), SiO2(A)>SiO2(B), Al2O3(A)>Al2O3(B), Jin Erkao
Consider SiO2/Al2O3Value, if [SiO2/Al2O3](A)>[SiO2/Al2O3](B), can determine whether silicate ash deposition propensity：A>B；If [SiO2/
Al2O3](A)<[SiO2/Al2O3](B), and then consider (SiO2+K2O)/Al2O3If, [(SiO2+K2O)/Al2O3](A)>[(SiO2+
K2O)/Al2O3](B), can determine whether silicate ash deposition propensity：A>B；If otherwise [(SiO2+K2O)/Al2O3](A)＜ [(SiO2+K2O)/
Al2O3](B)Then there is silicate ash deposition propensity：A<B.
Wherein,
[SiO2/K2O](A)Represent SiO2(A)With K2O(A)Ratio；
[SiO2/K2O](B)Represent SiO2(B)With K2O(B)Ratio；
[(SiO2+K2O)/Al2O3](A)Represent SiO2(A)With K2O(A)Sum and Al2O3(A)Ratio；
[(SiO2+K2O)/Al2O3](B)Represent SiO2(B)With K2O(B)Sum and Al2O3(B)Ratio；
[SiO2/Al2O3](A)Represent SiO2(A)With Al2O3(A)Ratio；
[SiO2/Al2O3](B)Represent SiO2(B)With Al2O3(B)Ratio.
According to upper pathway, two kinds of biomass fuel silicate ash deposition propensities can be made and clearly compare, be easy to fuel to select
Type and combination collocation.
Example：
From two kinds of cotton stalks for being grown on Xinjiang of China Bachu and the Jiangsu shining sun, burn respectively in the M types of 12MW and 30MW
In biomass vibration grate stove, two boilers arrange all same except load difference external system.Two kinds of cotton stalk ash component analysis results are such as
Shown in table 1：
The cotton stalk ash component analysis result (unit of table 1：Wt%)
Slagging trend decision method in the present invention, Bachu cotton stalk is represented with A, and B represents shining sun cotton stalk, by ash component
Analysis result understands：K2O(A)>K2O(B), SiO2(A)<SiO2(B), therefore have [SiO2/K2O](A)<[SiO2/K2O](B), and Al2O3(A)<
Al2O3(B), therefore the 2) part in decision method, it is known that ash deposition propensity A>B.
The two-stage superheater of slagging scorification most serious is investigated, it is found that Bachu biomass power plant slag body is up to 900mm, and the shining sun is biological
Matter power station slag body is only that, less than 70mm, Bachu cotton stalk slagging trend is far above shining sun cotton stalk.Therefore, slagging scorification is carried out using this method
The result of tendency judgement matches with the actual slagging scorification situation of boiler.
Claims (1)
1. a kind of decision method of biomass boiler silicate slagging trend, it is characterised in that：Comprise the following steps：Burning A, B
Two kinds of biomass fuels obtain two kinds of biomass ashs of A, B, then carry out constituent analysis, obtain K2O、SiO2And Al2O3Account for biomass
The mass percent of ash：K2O(A)、K2O(B)、SiO2(A)、SiO2(B)、Al2O3(A)、Al2O3(B)；Judge fuel silicon according to following steps
Hydrochlorate slagging trend：
1) to two kinds of biomass ashs of A, B, if meeting K2O(A)>K2O(B), SiO2(A)>SiO2(B), Al2O3(A)<Al2O3(B), judge silicon
Hydrochlorate ash deposition propensity：A>B；
If 2) K2O(A)>K2O(B), but SiO2(A)<SiO2(B), then [SiO2/K2O](A)<[SiO2/K2O](B)If, Al simultaneously2O3(A)<
Al2O3(B), judge silicate ash deposition propensity：A>B；If Al2O3(A)>Al2O3(B), and then consider (SiO2+K2O)/Al2O3If,
[(SiO2+K2O)/Al2O3](A)>[(SiO2+K2O)/Al2O3](B), judge silicate ash deposition propensity：A>B；If otherwise [(SiO2+
K2O)/Al2O3](A)＜ [(SiO2+K2O)/Al2O3](B)Then there is silicate ash deposition propensity：A<B；
If 3) meet K2O(A)>K2O(B), SiO2(A)>SiO2(B), Al2O3(A)>Al2O3(B), and then consider SiO2/Al2O3Value, if
[SiO2/Al2O3](A)>[SiO2/Al2O3](B), judge silicate ash deposition propensity：A>B；If [SiO2/Al2O3](A)<[SiO2/
Al2O3](B), and then consider (SiO2+K2O)/Al2O3If, [(SiO2+K2O)/Al2O3](A)>[(SiO2+K2O)/Al2O3](B), judge
Silicate ash deposition propensity：A>B；If otherwise [(SiO2+K2O)/Al2O3](A)＜ [(SiO2+K2O)/Al2O3](B)Then there is silicate knot
Slag is inclined to：A<B；
K2O(A)Represent K in A biomass ashs2The mass percent of O；
K2O(B)Represent K in B biomass ashs2The mass percent of O；
SiO2(A)Represent SiO in A biomass ashs2Mass percent；
SiO2(B)Represent SiO in B biomass ashs2Mass percent；
Al2O3(A)Represent Al in A biomass ashs2O3Mass percent；
Al2O3(B)Represent Al in B biomass ashs2O3Mass percent；
[SiO2/K2O](A)Represent SiO2(A)With K2O(A)Ratio；
[SiO2/K2O](B)Represent SiO2(B)With K2O(B)Ratio；
[(SiO2+K2O)/Al2O3](A)Represent SiO2(A)With K2O(A)Sum and Al2O3(A)Ratio；
[(SiO2+K2O)/Al2O3](B)Represent SiO2(B)With K2O(B)Sum and Al2O3(B)Ratio；
[SiO2/Al2O3](A)Represent SiO2(A)With Al2O3(A)Ratio；
[SiO2/Al2O3](B)Represent SiO2(B)With Al2O3(B)Ratio；
Two kinds of biomass fuels of A, B are single-fuel, the fuel combination of various single-fuels composition, single-fuel addition additive
Denatured fuel or fuel combination afterwards adds the denatured fuel after additive；
According to two kinds of biomass fuel silicate ash deposition propensity results of A, B, the fuel type selecting and combination collocation of boiler of power plant are carried out.
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