Gasification property of coal–oilfield wastewater–slurry and microscopic mechanism analysis

Abstract

ABSTRACTOilfield wastewater was used to prepare coal slurry, which is called coal–oilfield wastewater–slurry. The gasification properties of coal–oilfield wastewater–slurry and coal water slurry were studied by using the thermogravimetry method, and the promoting effect of oilfield wastewater on gasification was also determined at the micro level. Results showed that coal–oilfield wastewater–slurry and coal water slurry both exhibited a similar gasification process. However, compared with coal water slurry, all the gasification parameters of coal–oilfield wastewater–slurry were better, thereby suggesting that oilfield wastewater play a positive role in promoting gasification. Sodium ions and potassium ions were distributed on the coal particle surfaces and also in the pores, and they provided active sites and enhanced the gasification activity.