Research On Regional Suitability Evaluation Index System And Application Of Household Biogas

Crop Straw,animal and human manure quantity is large in China every year,irrationally treatment is both a waste of biomass energy source and will cause serious air pollution,soil pollution and groundwater pollution,it may bring harmful effects to people's life and production activities.To develop the biogas in the rural area not only increases energy supply,but also significance to promote development of rural economy and improve the ecological environment of rural area.Through many years' development,China has gained significant effects in the term of construction of biogas pools,has formed mature technology of biogas production,scientific model of biogas construction,has gained sound system of management and service and better popularity.However,during process of biogas extension,there is still the blindness,which will influnce expected effect and waste human resources and material resources.However,evaluation on regional suitability of household is a weak link in biogas construction.,especially little correlation reports and study has been done about how to evaluate household regional suitable level,what index should be used and how to evaluate by these index.Due to lack of workable quantitative index and method,scientific judgement for suitable level cannot be drawn in many area,because lack reasonable basis in biogas construction mode,comprehensive utilization ways and reasonable planning.Thus affect scientific decision of decision level,has hampered establishment and implement of development for household biogas in rural area seriously.On the base of consulting previous references and comprehensively analysing of developing situation of biogas.Index system of assessment of regional suitability in china is constructed and comprehensive evaluation method was proposed,then there give a empirical analysis,the reseach can provide a basis to evaluation on regional suitability of household biogas.Through analysing and researching, main conclusions are as follows:(1) Survey of household biogas in China is conclusioned,due to a series of problems,as fellows:lack planning and household biogas development is different;exist incomplete understanding andlack necessary attention to household construction;lack of money and spend much money;propaganda and training and power is not satisfy;pay little attention to matching technology and low comprehensive utilization rate;weak technology force and follow service is not timely.At last dissertation was put forward.(2) On the base of consulting related references,according to principle of scientificity, scientificity,hierarchy assembly,comprehensiveness and maneuverability,in view of climate,resources,economy and society,the research constructs index system of assessment of regional suitability,including average temperature,average sunshine time,day of less then 10℃in one year,moer then 10℃cumulative temperature,rural population,major fame products output,main livestock penned,rural average net income,local financial revenue,rural laborer,population natual growth rate and rate for children school age,12 index variable in totle.(3) Affter comparison and analysis different comprehensive evaluation method,forward applying principal component analysis to evaluate regional suitability of household biogas.through principal component analysis,can screened out main factors of index system evaluation;region clivision can get by cluster analysis with factor value.(4) On the base of index system and evaluation method of regional suitability.A case study of Yan'an City,comprensive analysis was analyzed by principal components analytic method and the regional classification was classified by cluster analytic method.The results of the comprehensive sequencing of regional suitability of household biogas in the Yan'an City is:Wuqi County>Ansai County>Luochuan County>Zhidan Country>Yanchuan Country>Yichuan Country>Huanglong Country.With the clustering analysis divided 7 country into 3 regional suitability types:suitable region,fairly suitable region,unsuitable region.Suitable region includes Yanchuan Country andYichuan Country;fairly suitable region includes Ansai County,Luochuan County and Wuqi County;unsuitable region includes Zhidan Country and Huanglong Country.