Drying and Organic Chlorine Thermal Decomposition Behavior of Municipal Solid Waste using Superheated Steam

Abstract

An experiment on drying and dechlorinating refuse derived fuel (RDF) using superheated steam was carried out and compared with a simple heat and mass transfer model in order to examine the behavior of organic chlorine thermal decomposition in municipal solid waste (MSW). The heat transfer and drying model consists of three parts : a steam condensation period, a constant rate drying period and a decreasing drying period. Either the water content or the temperature of the sample was predicted successfully using the other experimental value. Sample temperatures reached almost the same temperature as 473 K superheated steam after about 30 min at the 473 K superheated steam temperature, or about 15 min at a 523 K temperature. The rate of water content decrease accelerated with the increase in superheated steam temperature. The developed drying model enabled us to predict time-dependent changes in the sample temperature or in the sample water content.About 90% of the organic chlorine was decomposed in about 60 min in 523 K superheated steam. The lower heating value decreased with the decrease in the dry yield, because decomposition of the sample resulted in decreases in carbon and hydrogen along with chlorine.

Carbonization of Sugarcane Bagasse and Heat Transfer Property by Pyrolysis in Superheated Steam and Nitrogen Atmosphere

“…where ԑ1 is biomass sample emissivity for the calculation of the emissivity, ԑ2, of the superheated steam and can be calculated using the equation below 39) .…”

Effect of Ca(OH)2 on the Release Characteristics of HCl during Sludge Combustion

“… 24 During the combustion process, some HCl can be released from the chlorinated hydrocarbons in the organic waste between 200 and 360 °C 25 and it releases completely at 400 °C. 26 The depolymerization and thermal decomposition of plastics are the basic pathways for the formation of HCl. 27 The chlorine-containing components in the inorganic waste will tend to volatilize into the gas phase.…”

“…Organic and inorganic chloride sources release chlorine at high temperatures and then form HCl with the hydrogen ion . During the combustion process, some HCl can be released from the chlorinated hydrocarbons in the organic waste between 200 and 360 °C and it releases completely at 400 °C . The depolymerization and thermal decomposition of plastics are the basic pathways for the formation of HCl .…”

Dechlorination of Polyvinyl Chloride under Superheated Steam with Catalysts and Adsorbents

“…On the other hand, some of the authors carried out the dechlorination of refuse-derived fuel (RDF), , chlorides in incineration ash, and the carbonization of biomass by superheated steam, which has gained much attention as a result of the simplicity of the equipment and the higher heat transfer property. The effects of superheated steam on the dechlorination and the additives were not clear in these studies.…”