Grey Method with Use of an Analytic Hierarchy Process for Performance Evaluation of Flue Gas Desulfurization Technology

A grey synthetic decision-making system with use of an analytic hierarchy process (AHP) is introduced to evaluate the performance of flue gas desulfurization technology (FGDT) from three main aspects, which were technology property, economy and environmental performance. The evaluation process is carried out as follows: integrative grey evaluation model is founded, representative grey evaluation object set and evaluation object factor set are chosen, a certain reference sequence comprising the best value of each evaluation factor is determined, grey relational coefficients are confirmed by Professor Deng Julong’s grey relation analysis method, the factor weight is calculated by the AHP for improving the reliability and objectivity of the evaluation results, and then the comprehensive evaluation index of each FGDT can be gotten by taking into account all factor values of the same technology with the help of summation with weighted method, finally, according to the rule of maximum grey relational grade, the best technology of flue gas desulfurization for a specially conditioned case is then obtained. As an example, six kinds of representative FGDT are compared and evaluated. The result shows that this method is of high precision and can provide a reliable footing for the selection of FGDT.