Abstract
The incineration treatment of municipal solid waste is widely used, but gas-phase hydrogen chloride (HCl) generated during the incineration seriously threatens the heating surface of boiler tail, and even causes serious harm to environment. Through incineration experiments, this paper found that many factors (temperature, oxygen concentration, residence time and moisture content) affect the HCl emission characteristics in the process of municipal solid waste incineration treatment. In order to effectively cut back the HCl emission in incineration treatment of municipal solid waste, this paper proposes torrefaction and classification pretreatment of municipal solid waste. Torrefaction pretreatment has a significant inhibitory effect on HCl emission during the incineration of mixed municipal solid waste. At the same time, compared with the incineration treatment of mixed municipal solid waste, sawdust and plastic municipal solid waste of the same quality after classification pretreatment can effectively curb HCl emissions within the entire temperature range. In particular, HCl emissions are reduced by 35% during sawdust incineration treatment at 400°C. Furthermore, by studying the reaction mechanics of HCl generation during combustion at different temperatures, and the reaction rate of HCl generation is: mixed municipal solid waste >plastic >sawdust. Therefore, this paper believes that torrefaction and classification pretreatment of mixed municipal solid waste is beneficial to inhibit the precipitation of chlorine during the incineration process and promotes the resource utilization of municipal solid waste, which is of significant significance for energy conservation and emission reduction.
Highlights
With the rapid development of our country economy, the output and growth rate of municipal solid waste ranks first in the world and grows at a rate of 8%-10% per year [1, 2]
After municipal solid waste mixture is burned in an air atmosphere with a reaction time of 20 min, Cl-hydrogen chloride (HCl) conversion rate continues to increase within the temperature range of 200-700°C
In two temperature ranges, the former is release of organic chlorine, and the latter is precipitation of inorganic chlorine [14, 23, 24]. It can be seen from the figure that combustion temperature affects the conversion of Cl-HCl, and the conversion rate of Cl-HCl increases significantly with the increase of combustion temperature during combustion process
Summary
With the rapid development of our country economy, the output and growth rate of municipal solid waste ranks first in the world and grows at a rate of 8%-10% per year [1, 2]. Compared with the long time period of landfill and compost, incineration has advantages of reducing energy consumption, fast treatment speed and high temperature sterilization, and has become an important way to deal with municipal solid waste [3,4,5,6]. Municipal solid waste incineration will release a large number of HCl pollutant gas, will corrode the metal pipe wall, shorten the service life of the equipment, at the same time, in the presence of carbon sources will produce dioxin precursors, which seriously harm to life and ecological environment [21, 22]. Comparative research of influence of municipal solid waste torrefaction and classification on waste incineration pollutant emission based on the perspective of HCl release, which is aimed at providing a theoretical basis for municipal solid waste torrefaction and classification to reduce pollutant emission
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
