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Study on Incineration of Organic Wastewater with High Concentration in Fluidized Bed

Author: LiShiZuo
Tutor: TanHePing；BieRuShan
School: Harbin Institute of Technology
Course: Engineering Thermophysics
Keywords: double beds with double temperatures fluidized bed HCl percolation theory agglomeration HCN
CLC: X703
Type: PhD thesis
Year: 2006
Downloads: 340
Quote: 1
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Abstract


Incineration is a good method to deal with the organic wastewater with high concentration in fluidized bed. However, the following issues are necessary to investigate. For example, if the wastewater contains alkali metal salts, bed agglomeration will occur, because quartz sand can react with the alkali metal salts, which will lead to the defluidization. In addition, the capacity of Ca-based compound, such as limestone, for binding HCl is small in the temperature range of 800~900℃. Therefore, a new fluidized bed combustion technique is presented in this paper, which is low temperature gasification bed with high temperature oxygenation fluidized bed incineration technique. This technique could resolve the problems encounted in the incineration of organic wastewater in fluidized bed. The incinerator combines the gasification fluidized bed with lower temperature and the oxygenation fluidized bed with higher temperature. This technique can avoid bed agglomeration because of the low temperature, control and remove HCl, SO2 and NOx in flue gas, and destroy the organic compounds completely.In this paper, the investigation is focused on the mechanism and the experiments in a bench-scale fluidized bed for low temperature and gasification fluidized bed incineration technique. The researches for incineration of organic wastewaters that contain chlorine, alkali metal salts and nitrogen in fluidized bed are conducted respectively, in order to obtain the necessary design and operation parameters, resolve the key technical problems and provide the theory. The detailed contents are as the following.1. Study on the emission and removal of HCl from incineration of chlorinated wastewater in fluidized bed. The emission and removal of HCl by Ca-based sorbent (CaO or limestone) from incineration of organic wastewater which contains C2H3Cl3O2 have been investigated in a bubbling fluidized bed. Experimental results show that organic Cl-HCl conversion increases as temperature increasing, and when the temperature is higher than 600℃, the organic Cl-HCl conversion would exceed 95%; the optimal temperature of binding HCl for CaO is 500~600℃, and the optimal Ca/Cl molar ratio is 3.5. The SEM analysis for the CaO particle surface at different temperatures and reaction time indicate that the formation of the product layer

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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