| China is rich in coal resources, of which the proportion of low rank coal up to50%. However, due to the low degree of coalification and the high of volatile matter and moisture content in low rank coal, it is resulting in lower direct combustion efficiency. Therefore, we need low rank coal become an necessary path of economic development in China’s energy. In this regard, it is proposed the classification of low rank coal poly-generation concept, of which the low rank coal pyrolysis poly-generation technology has been more attention. At present, domestic and foreign have came up with dozens of different reactor and process low rank coal pyrolysis poly-generation technologies. As a result of these technologies related to many factors, so it is difficult to preferred a more advanced, economical and practical technology. It is urgent that we address this issue on use of low rank coal efficiently.Aiming at the low rank coal pyrolysis poly-generation technical characteristics, this paper carry out multi-level fuzzy comprehensive evaluation method used in low rank coal pyrolysis poly-generation comprehensive evaluation. A new multi-level fuzzy mathematical evaluation model was established and the fluidized bed, moving bed and to focus heat carrier at the core of the three typical low rank coal pyrolysis poly-generation technologies was selected. Establishment of4first-level indicators and10second-level and17t hird-level indicators constitute the comprehensive evaluation system. Furthermore, using the method of Delphi and Analytic Hierarchy Process determine the weights of indicators at all levels. The results suggest that:(1) In Ⅰ level indicators, the largest share is technical indicators, followed by environmental indicators, economic indicators and social indicators.(2) In Ⅱ level indicators, the indicators of efficiency, corporate earnings, emission of gaseous pollutants and technical maturity is arranged in the front. In environmental indicators, gaseous pollutants and liquid pollutants is more important. Consequently, the environmental indicators need to be given attention.(3) In Ⅲ level indicators, the indicators of industrialization are the largest share, followed by output per unit of energy waste water emissions. From that, we can see the development of this technology needed to be obtained a great deal of attention in the industrial production capacity. This evaluation system has both objective technical analysis and the guidance of the members of the expert, so it has good reliability and universal reference value.Based on the research results on appeal, the paper selected three typical process of low rank coal pyrolysis poly-generation technology evaluation, DG process, BJY process and ZDL technology, to be fuzzy comprehensive evaluated. Utilization of fuzzy mathematical model and based on the weighted average method, the evaluation results are as follow:technique considerations:BA1=71.65,BB1=69.97,BC1=76.96; economy considerations:BA2=67.96, BB2=71.56, BC2=76.74environment considerations:BA3=72.10,BB3=71.18, BC3=76.88; considered from the social aspects, BA4=70.94,BB4=64.66,BC4=78.91. Finally, from the four factors taken into account, the results of the evaluation were BA=71.23,BB=70.45, BC=77.11. Three low-level coal poly-generation technology performance advantages and disadvantages order:ZDL process, DG process, BJY process. At last, using the engineering instance data to checking, results show that the use of actual production data evaluation results obtained with the calculated results based on fuzzy comprehensive evaluation method, indicating that the method is reasonable and practicality in the low-level coal pyrolysis poly-generation technologies Evaluation. Low rank coal pyrolysis poly-generation fuzzy comprehensive evaluation method can reduce industrial production selection of one-sidedness and blindness on low rank coal pyrolysis poly-generation technology. What’s more, providing decision support to government and industrial production in select the appropriate low rank coal pyrolysis poly-generation technologies... |
PDF Full Text Request