CN107449526A - A kind of method for the suitable outlet temperature of burner hearth for determining biomass fired boiler - Google Patents
A kind of method for the suitable outlet temperature of burner hearth for determining biomass fired boiler Download PDFInfo
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- CN107449526A CN107449526A CN201710262074.6A CN201710262074A CN107449526A CN 107449526 A CN107449526 A CN 107449526A CN 201710262074 A CN201710262074 A CN 201710262074A CN 107449526 A CN107449526 A CN 107449526A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
- G01N25/04—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering of melting point; of freezing point; of softening point
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Abstract
A kind of method for the suitable outlet temperature of burner hearth for determining biomass fired boiler, passes through Fe in biomass ash2O3、CaO、MgO、K2O、Na2O、SiO、TiO2、Al2O3Mass percentage content calculate soda acid than B/A, B/A=(Fe2O3+CaO+MgO+K2O+Na2O)/(SiO2+TiO2+Al2O3)；Then furnace exit temperature T, T=ST 100+ (1.0 B/A) × 125 are calculated by softening temperature ST and soda acid ratio B/A.The present invention, which has, more to become more meticulous, more accurately determines the advantages of suitable furnace exit temperature.
Description
Technical field
The present invention relates to the method for design boiler furnace outlet temperature, more particularly to a kind of determination biomass fired boiler are suitable
The method of furnace exit temperature, the boiler design field particularly suitable for the high basic metal fuel of biomass-burning.
Background technology
China is the country using coal as main energy sources, and coal accounts for more than the 70% of China's primary energy consumption.However, from
The coal proven reserve in reserve-production ratio Lai Kan China is only sufficient to exploitation 31 years, can be held although still having unknown colliery in the future
Hair, but in general, exhaustion is that the mankind have to the cruel reality that calmness faces to fossil fuel at last.In order to tackle possibility
The fossil fuel of appearance is exhausted, it is necessary to develops regenerative resource.
Biomass is increasingly subject to pay attention to as regenerative resource.China often produces agricultural crop straw total amount per year, is approximately equivalent to 3.5
Hundred million tons of mark coals, these biomass can be directly used as boiler oil, and burning produces factory steam or generating.However, biomass
Alkali metal content is high, ash fusion point is low, and when designing biomass fired boiler, how to determine furnace exit temperature is a new problem.Press
More solito coal-burning boiler method is designed, and furnace exit temperature can be made higher, cause the frequent dust stratification of heating surface and slagging, blowing out clear
Jiao, boiler equipment availability factor decline.This is the situation of boiler heating surface dust stratification slagging, when heating surface blocks, it has to blowing out.
At present, due to the design method of the specific biomass fired boiler of shortage, biomass fired boiler is usually with reference to coal-fired pot
Stove design method designs, and when designing coal-burning boiler, furnace exit temperature is typically not less than the deformation of coal-fired ash content ash fusion point
Temperature DT, if the ash fusion point softening temperature ST and deformation temperature of coal ash relatively when, i.e. ST and DT temperature difference is less than 100
DEG C, the furnace exit temperature being typically designed is not to be exceeded ST-100 DEG C and is used as furnace exit temperature.In general, biomass ash
ST temperature and DT temperature relatively, and all than relatively low, if taking ST-100 DEG C to be used as furnace exit temperature, can frequently result in
The furnace exit temperature of design is relatively low.In addition, when carrying out fuel ash melting point analysis, fire coal is carried out in 815 DEG C of Muffle furnaces
Ashing.And for biomass, because alkali metal content is higher in biomass, 815 DEG C of ashing temperature is higher for biology, this
It is that alkali metal escapes during making into ash because of temperature is too high, and causes analytical error bigger than normal, analyzes obtained DT, ST temperature
It is higher, it is impossible to reflect real situation, the furnace exit temperature for instead resulting in design is higher.
Generally speaking, the method for rationally determining biomass fired boiler furnace exit temperature is also lacked at present.
The content of the invention
The problem of for lacking design effectively biomass fired boiler furnace exit temperature method in the prior art, the present invention carries
For a kind of method for the suitable outlet temperature of burner hearth for determining biomass fired boiler, it is intended to it is determined that most rational furnace exit temperature,
On the one hand Boiler radiation heating surface is as much as possible utilized, on the other hand avoids afterbody convection heating surface dust stratification and slagging.
The present invention is achieved by the following technical solutions：
A kind of method for the suitable outlet temperature of burner hearth for determining biomass fired boiler, this method include：
Appropriate biomass, preferably 100 ~ 500 grams are weighed, is put into Muffle furnace and is heated into ash；
The biomass ash that will be generated in Muffle furnace, ash fusion point is analyzed with ash fusion point analyzer, obtains the deformation temperature of biomass ash
DT and softening temperature ST, deformation temperature DT and softening temperature ST unit are DEG C；
The biomass ash that will be generated in Muffle furnace, the metal oxide component in biomass ash is analyzed with XRF XRFs, is obtained
Obtain Fe in biomass ash2O3、CaO、MgO、K2O、Na2O、SiO、TiO2、Al2O3Mass percentage content；
Pass through Fe in biomass ash2O3、CaO、MgO、K2O、Na2O、SiO、TiO2、Al2O3Mass percentage content calculate soda acid
Than B/A, B/A=(Fe2O3+CaO+MgO+K2O+Na2O)/(SiO2+TiO2+Al2O3)；
Furnace exit temperature T, the T=ST-100+ (1.0-B/ of biomass fired boiler are calculated than B/A by softening temperature ST and soda acid
A) × 125, B/A is worked as>It is 1.0 that B/A is taken when 1.0, works as B/A<It is 0.2 that B/A is taken when 0.2.
In above-mentioned technical proposal, the atmosphere in Muffle furnace is air, is 580 DEG C into grey temperature, and the heat time is 3 hours.
In above-mentioned technical proposal, according to the stove of T=ST-100+ (1.0-B/A) × 12.5 biomass fired boilers being calculated
When thorax outlet temperature T is higher than the deformation temperature DT of biomass ash, furnace exit temperature T=deformation temperature of biomass fired boiler is taken
DT。
The present invention compared with prior art, has advantages below and high-lighting effect：1. the present invention uses 580 DEG C of Low Temperature Ashs
Change legal system ash, rather than 815 DEG C of system ashes with coal-burning boiler, alkali metal overflows and distortion during can avoiding into ash；2. adopt
With softening temperature ST and the common determination furnace exit temperature of grey soda acid ratio, more become more meticulous, more accurately determine suitable furnace outlet
Temperature；3. accurate furnace exit temperature, on the one hand improving the utilization rate of radiation of burner hearth heating surface, be advantageous to reduce the cost,
On the other hand boiler tail convection heating surface dust stratification and slagging are avoided that, improve the availability of boiler.
Embodiment
The embodiment and the course of work of the present invention are further described below.
A kind of method of suitable outlet temperature of burner hearth for determining biomass fired boiler provided by the invention, this method include：
Appropriate biomass, preferably 100 ~ 500 grams are weighed, is put into Muffle furnace and is heated into ash；
The biomass ash that will be generated in Muffle furnace, ash fusion point is analyzed with ash fusion point analyzer, obtains the deformation temperature of biomass ash
DT and softening temperature ST, deformation temperature DT and softening temperature ST are DEG C；
The biomass ash that will be generated in Muffle furnace, the metal oxide component in biomass ash is analyzed with XRF XRFs, is obtained
Obtain Fe in biomass ash2O3、CaO、MgO、K2O、Na2O、SiO、TiO2、Al2O3Mass percentage content；
Pass through Fe in biomass ash2O3、CaO、MgO、K2O、Na2O、SiO、TiO2、Al2O3Mass percentage content calculate soda acid
Than B/A, B/A=(Fe2O3+CaO+MgO+K2O+Na2O)/(SiO2+TiO2+Al2O3)；
Furnace exit temperature T, the T=ST-100+ (1.0-B/ of biomass fired boiler are calculated than B/A by softening temperature ST and soda acid
A) × 125, B/A is worked as>It is 1.0 that B/A is taken when 1.0, works as B/A<It is 0.2 that B/A is taken when 0.2.
In order to avoid being overflowed and distortion into alkali metal during ash, the atmosphere in Muffle furnace is air, and biomass system ash is warm
Degree, grey temperature be 580 DEG C, the heat time be 3 hours.
In above-mentioned technical proposal, according to the stove of T=ST-100+ (1.0-B/A) × 125 biomass fired boilers being calculated
When thorax outlet temperature T is higher than the deformation temperature DT of biomass ash, furnace exit temperature T=deformation temperature of biomass fired boiler is taken
DT.The unit of temperature is DEG C.
One embodiment：
For maize straw, 500 grams are taken, 580 DEG C are ashed 3 hours in Muffle furnace, take out ash and are analyzed, the deformation of ash fusion point
Temperature DT=930 DEG C, softening temperature ST=1010 DEG C.Maize straw ash after ashing analyzes its metal using XRF XRFs
Oxide components are SiO2=37.8wt.%, Al2O3=0.8wt.%, TiO2=0.0wt.%, Fe2O3=0.9wt.%, CaO=
14.6wt.%, MgO=9.5wt.%, K2O=22.6wt.%, Na2O=0.1wt.%, according to B/A=(Fe2O3+CaO+MgO+K2O+
Na2O)/(SiO2+TiO2+Al2O3) soda acid is calculated than B/A=1.24.Due to B/A>1.0, so it is 1.0 to be taken as B/A here,
Then T=ST-100+ (1.0-B/A) × 125 DEG C=1010-100+ (1.0-1.0) × 125=910 DEG C.910℃<DT=930 DEG C, so
The design furnace exit temperature of the combustion maize straw boiler is 910 DEG C.This is due to that soda acid is more bigger than B/A, is designed here
The furnace exit temperature of biomass fired boiler has taken lower bound, i.e., lower than softening temperature ST 100 DEG C.
Claims (3)
- A kind of 1. method for the suitable outlet temperature of burner hearth for determining biomass fired boiler, it is characterised in that this method includes：Appropriate biomass is weighed, is put into Muffle furnace and is heated into ash；The biomass ash that will be generated in Muffle furnace, ash fusion point is analyzed with ash fusion point analyzer, obtains the deformation temperature of biomass ash DT and softening temperature ST, deformation temperature DT and softening temperature ST are DEG C；The biomass ash that will be generated in Muffle furnace, the metal oxide component in biomass ash is analyzed with XRF XRFs, is obtained Obtain Fe in biomass ash2O3、CaO、MgO、K2O、Na2O、SiO、TiO2、Al2O3Mass percentage content；Pass through Fe in biomass ash2O3、CaO、MgO、K2O、Na2O、SiO、TiO2、Al2O3Mass percentage content calculate soda acid Than B/A, B/A=(Fe2O3+CaO+MgO+K2O+Na2O)/(SiO2+TiO2+Al2O3)；Furnace exit temperature T, the T=ST-100+ (1.0-B/ of biomass fired boiler are calculated than B/A by softening temperature ST and soda acid A) × 125, B/A is worked as>It is 1.0 that B/A is taken when 1.0, works as B/A<It is 0.2 that B/A is taken when 0.2.
- 2. the method for the suitable outlet temperature of burner hearth according to a kind of determination biomass fired boiler described in claim 1, its feature It is：Atmosphere in the Muffle furnace is air, is 580 DEG C into grey temperature, and the heat time is 3 hours.
- 3. the method for the suitable outlet temperature of burner hearth according to a kind of determination biomass fired boiler described in claim 1, its feature It is：According to the furnace exit temperature T of T=ST-100+ (1.0-B/A) × 125 biomass fired boilers being calculated higher than biology During the deformation temperature DT of matter ash, furnace exit temperature T=deformation temperature DT of biomass fired boiler is taken.
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| CN108332196A (en) * | 2017-12-22 | 2018-07-27 | 浙江浙能技术研究院有限公司 | A method of reducing biomass boiler back-end surfaces deposition |
| CN111457419A (en) * | 2020-04-08 | 2020-07-28 | 西安热工研究院有限公司 | Design control method for temperature of flue gas at outlet of boiler hearth |
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| CN111457419A (en) * | 2020-04-08 | 2020-07-28 | 西安热工研究院有限公司 | Design control method for temperature of flue gas at outlet of boiler hearth |
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