Pilot test study on new moving bed equipment for low rank coal pyrolysis

In order to explore the suitable process conditions for new moving bed equipment of low rank coal pyrolysis,analysis of temperature-control characteristics of the pyrolysis equipment using the non-stick coal in Northern Shaanxi was carried out.The pyrolysis pressure was higher than atmospheric pressure 3-5 mm water column,and the reaction time was 2 h.The temperature was set to be 550、600、650、700 and 750 ℃.The results show that temperature-control system of the pyrolysis device performes smoothly,and material temperatures are always lower 50-80 ℃ than that of the furnace wall.Semi-coke can be completely pyrolyszd in different temperatures,and the volatiles of semi-coke is reduced from 14. 74%( at 550 ℃) to 6. 34%( 750 ℃).The pulverization is found during the pyrolysis,and the degree of the pulverization increases with the increase of the final pyrolysis temperature,as well the content of light component in pyrolysis tar can reach 66%-73%.In addition,the multi-section dust reduction process works with good performance,and the dust content in the pyrolysis tar is less than 1%.