Research On Biomass Resource And Energy Integrating Utilization For China Further Countryside

Building energy conservation has become the consensus of Chinese society with energy saving in building design,energy saving in building energy equipment and energy saving in building energy sources being three important ways.Currently,most of the researchers are focusing on the study of urban buildings or building complexes,mainly high-rise buildings and public buildings,while few people study the energy saving of rural residential buildings.China’s rural modernization is gradually accelerating,including agricultural modernization and the improvement of human settlements.The construction standards and energy-saving standards of urban buildings,as well as the relevant building energy saving measures,have reached a certain level,especially for the thermal insulation technology of building envelopes,the promotion space is increasing limited.At the same time,with the acceleration of rural modernization in China,the energy pattern in rural China has been changed,and agricultural wastes have lost their traditional functions,so there should be more scientific and reasonable measures to deal with them.Therefore,in the light of the above background,the high-value application of agricultural wastes is chosen as the research object,which can contribute to the improvement of rural human settlements and treatment of agricultural wastes.Three research methods,including theoretical analysis,experimental testing and software simulation,are used to study the comprehensive utilization of biomass resources and energy in China’s modern rural areas.The main research contents and achievements are as follows:1.In this paper,the research and analysis of global research status of biomass-based insulation materials for buildings has be done systematically,and the main research results of biomass based insulation materials published from 1974 to April 2016 are systematically analyzed.Specifically including:the number of papers published each year——indicating the progress of the research;the distribution of published journals——presenting the important disciplines or fields of the research;the nationality and geographical distribution of researchers——indicating the key countries and regions of the research;the main research methods,research depth,testing equipment and reference standards adopted by the researchers;in view of the shortcomings of existing research,putting forward corresponding suggestions and measures,so as to provide guidance for researchers in this field,and make some contributions to promote the development of this field.2.For the first time,a preparation technology of building thermal insulation materials with wheat straw as raw material and geopolymer as binder was proposed,that is,adopting geopolymer as binder and based on foaming molding technology to prepare biomass based building insulation materials.Wheat straw abundant in the north of China was selected as biomass raw material and geopolymer with semi-crystalline three-dimensional inorganic network（formed by dissolution and polymerization of solid aluminium silicate and alkali activator solution）was performed as mineral binder,and the foaming process with hydrogen peroxide as foaming agent was explored.The experimental results show that when the crushing size（L）of wheat straw was 0.2³cm,the thermal conductivity of the materials was about 0.1W/（m·K）,the density was 330²90kg/m³,the compressive strength was1.65⁰.4MPa,the water absorption rate was 96-90%and the moisture absorption rate was`13³%;when the pre-wetting water/wheat straw mass ratio（Wp/W）was 0⁵,the thermal conductivity of the materials was 0.096⁰.11W/（m·K）,the density was 300³55kg/m³,the compressive strength was 1.3⁰.2MPa,the water absorption rate was 86¹08%and the moisture absorption rate was 13¹6%;when the wheat straw/solid content of binder mass ratio（W/S）was 0⁰.558,the thermal conductivity of the materials was 0.093⁰.11W/（m·K）,the density was 250³80kg/m³,the compressive strength was 0.5³.2MPa,the water absorption rate was 60%-90%and the moisture absorption rate was 10%³3%;when the H₂O₂/solid content of binder mass ratio（H/S）was 0⁰.0248,the thermal conductivity of the materials was 0.185⁰.09W/（m·K）,the density was 900²40kg/m³,the compressive strength was 5.6⁰.3MPa,the water and moisture absorption rates were 32%⁹0%and 8.2%¹1%respectively.3.The integrated application system of biomass energy and resources on two scales was studied.According to the fabrication process of biomass-based insulation materials,which required a certain amount of heat for drying,sterilization and curing,and considering the characteristics of building heat and energy demand,the technical idea of combining biomass-based insulation material preparation with energy production was put forward.With the help of process simulation software Aspen-plus platform,two kinds of system computing models were established.Through calculation,when the biomass input of the fuel cell system was 1550kg/h,biomass-based insulation materials of 6809⁷081kg/h were fabricated.At the same time,electricity of 316kW and domestic hot water of 2500kg/h at 60℃were produced.For the gas turbine system,when the biomass input was 23000kg/h,biomass-based insulation materials of 201396-209314kg/h were fabricated,and electricity of 2404kW and domestic hot water of 100 000kg/h at 60℃were also produced.4.A multi-energy coupled energy supply system based on biomass,which was suitable for the characteristics of energy resources and environment in contemporary rural areas of China,was proposed to meet the thermal and electrical needs of rural residential buildings,greenhouses and livestock pens.With the help of process simulation software Aspen-plus,the performance of the system was calculated,and the influence of key parameters on the the system was analyzed.The results show that when the biomass input was 1500kg and the temperature of gasification agents air and steam was 400℃,the system can achieve 88.34%primary energy utilization efficiency and 17.10%exergy efficiency with the investment return period being only 3.48 years;when the air equivalent ratio was 0.25⁰.55,the primary energy utilization ratio of the system was reduced from 88%to 43%,and the exergy efficiency was reduced from 17%to 8%;when the ratio of gasification agent steam to biomass was 0.2⁰.5,the primary energy utilization ratio was 90%⁸3%and the exergy efficiency was17.1%¹6.6%.The research work of this subject is in line with the current situation of China and has great practical significance.Moreover,the research results can also open up ideas for the high-value and comprehensive utilization of biomass for peer researchers,which has a certain theoretical guiding significance.