Fuel Selection And Utilization Of Biomass Energy For Chang’an 2# Thermal Power Station

Combined with industry-university-research project and engineering practice,this paper focuses on the construction of 2#heat station in district heating system of Changan heating company,besides,the selection of boiler fuel and the feasibility of using biomass briquette are discussed.This paper includes the following contents and results:（1）The operating cost of boiler with different fuel types is compared for the boiler fuel selection of Chang’an2#Thermal Power Station.Taking the steam production as 100t/h（70MW）as an example,a heating season,for example,the pulverized coal boiler can save 4.723million yuan than the traditional chain boiler;Biomass forming fuel,compared with natural gas can save 820.8 million yuan.While taking into account environmental and economic considerations,environmental protection and economy,optional biomass molding fuel.（2）Based on the large-scale production of Densified biomass briquetting fuel（DBBF）,the research and technical economic analysis of Shanxi Hanfeng Biomass Molding Fuel Production Line was carried out.The production line to pear tree branches as raw materials,with an annual output of 12,000 tons of fuel molding,analysis shows that the net present value of 5.19 million yuan,a positive note that the project is feasible.Raw material purchase price and molding fuel price are extremely sensitive to the economic impact of the project,the government is more sensitive to the construction investment subsidies.（3）In order to improve the performance of DBBF additives,the additives,additives and additives of DBBF were reviewed.From the point of view of functional classification and mechanism of action,DBBF additives,such as binder,antiseptic sinking additive and combustion promoter,were reviewed.Research Progress.Combined with practical engineering case,the woody biomass and herbaceous biomass,the additive is given an alternative species.Among them,biomass additives can be selected from high-quality microalgae microalgae.Finally,the principle of common DBBF additives screening is given,and the future research directions of DBBF additives are prospected.（4）Aiming at the optimization of the key parameters in the preparation of biomass fuel（DBBF）,the experimental system was designed.The physical properties（relaxation density,durability）and combustion characteristics（weight loss curve,rate curve）of the birch bark,which is representative of the typical biomass raw material,were designed.The effects of adding amount of microalgae,Water content,raw material size,molding pressure,molding temperature to optimize the test program.（5）Microalgae can not only absorb CO₂ emitted by fuel from heat source station,but also can be used as additive or direct blending combustion in DBBF preparation process.Based on the previous research,the influence of aeration flux on the growth of microalgae in the tangential casing was studied.The results showed that the aeration flow rate could significantly increase the cell density.Under the same superficial gas velocity,the performance of the microcysts of the tangential cutting tube was better than that of the coaxial sleeve,and the density of the tangent tube was 23.64%higher than that of the coaxial sleeve.