Preparation and slurry ability of coal water slurry with hydrothermal carbonization pretreatment of corn straw
Due to the high yield and low utilization of corn straw in China,hydrothermal carbonization(HTC)pretreatment of corn straw with coal was studied to prepare hydrochar coal water slurries(HC-CWS).Using corn straw as raw material,the hydrochar(HC)was prepared by HTC at temperature of 180,200,220,240 ℃ and time of 60 min.The results showed that HTC is a process of dehydration and deoxygenation.The yield and energy yield of HC decreased with increasing temperature.HTC resulted in the appearance of many microsphere particles on the surface of HC,which also led to the enlargement of the pore structure of HC.Mixing HTC-220 and ShenHua coal(SH),the effects of second liquid modification method and dosage and relative humidity on the slurry ability of HC-CWS was studied.The results showed that the HC-CSW had the lowest apparent viscosity and the beat fluidity when the kerosene was modified with HC.When the kerosene dosage was 0.8％ ,the HC-CWS had the lowest apparent viscosity and the apparent viscosity was 979.5 mPa·s.The apparent viscosity of HC-CWS decreased with the increase of relative humidity.This was due to the water molecules like"bottle stoppers"to prevent pores from being filled with water,which increased the content of free water in the HC-CWS and improved the slurry performance.
corn strawhydrothermal carbonizationcoal water slurryslurry abilitysurface modification
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