A steam dried municipal solid waste gasification a

Authors: Gang Xiao Baosheng Jin Mingjiang Ni Kefa Cen Yong Chi Zhongxin Tan

Publish Date: 2011/06/05

Volume: 5, Issue: 2, Pages: 193-

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Abstract

Considering highmoisture municipal solid waste MSW of China a steam dried MSW gasification and melting process was proposed the feasibility was tested and the mass and energy balance was analyzed Preliminary experiments were conducted using a fixedbed drying apparatus a 200 kg per day fluidizedbed gasifier and a swirl melting furnace Moisture percentage was reduced from 50 to 20 roughly when MSW was dried by slightly superheated steam of 150°C–350°C within 40 min When the temperature was less than 250°C no incondensable gas was produced during the drying process The gasifier ran at 550°C–700°Cwith an air equivalence ratio ER of 02–04 The temperature of the swirl melting furnace reached about 1240°C when the gasification ER was 03 and the total ER was 11 At these conditions the fly ash concentration in the flue gas was 17 g·Nm3−1 which meant over 95 fly ash was trapped in the furnace and discharged as slag 85 of Ni and Cr were bound in the slag as well as 60 of Cu The mass and energy balance analysis indicates that the boiler heat efficiency of an industrial MSW incineration plant reaches 8697 when MSW is dried by steam of 200°C The boiler heat efficiency is sensitive to three important parameters including the temperature of preheated MSW the moisture percentage of dried MS Wand the fly ash percentage in the total ash

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