Study On The Slagging Characteristics Of Biomass Briquette Layer-burning Boiler

ABSTRACT:The bio-energy in our country is very rich,especially the crop staff whose output amounts to more than 700 million ton,which is equal to more than 300 million tec.Research and development the technology making the most use of the biomass energy not only satisfy the need which the national economy development at high speed,but also decrease the contamination by fossil fuel,which can produce the gigantic economic and environmental benefits.The technology utilizing biomass energy has been developed enormously since 1980.According to the specialty which the biomass resources distributes broad area and proper to be developed on the spot, development the burning technology applying to the industry boiler is the important approach making the most of biomass energy.The smoke and ash,SO₂ and NO_x discharged by the biomass burning are far lesser than that of the coal burning, Biomass briquette,which is easy to store and transport,is one the kind of high-grade fuel suitable to the industry boiler.The special equipments burning biomass briquette have come out consecutively in our country,and are having been set the example application in some area.In the process of operation,it is found that the slag in the grate of boiler is a usual phenomenon.The slagging question is one of the most questions which exist in the biomass briquette combustion technology,the slag has an enormous influence to the fuel combustion efficiency and the safe operation of combustion equipment.As a result of the slag's existence,the spread and utilization of biomass briquette technology are limited seriously.Therefore,we have carried the combustion experiment on the existent biomass briquette boiler.According to the analysis method of fuel ash component GB/T476—2001 and the mensuration of slagging property GB/T1572—2001,we have measured the component of ash which is the burning remained.On the base of testing the ash competent,this subject estimated the slagging trendency of corn straw briquette and sawdust briquette with one index judgment and many indexes synthetic judgment.Starting with the temperature in hearth and the aerodynamic field in furnace,we carried out various working condition experiment on the biomass briquette boiler,analyzed the slagging impact factors and concluded the slagging law in the light of the design and working parameters to boiler.This paper observed the appearance of furnace slag on the electric mirror,analyzed the slagging process and causation.Finally,this paper summarized some measures preventing from biomass briquette slagging on the basis experiment.To sum up,this paper not only provides the theoretical basis for designing the new kind combustion equipment of biomass briquette and the biomass briquette boiler's safe operation,but also lays the foundation for the extensive utilization of biomass briquette and biomass briquette boiler.