Selection and application of black water treatment agent in dry pulverized coal gasification
Based on the black water treatment process of dry pulverized coal gasification unit and the characteristics of its circulating ash water,the action mechanism and effect of flocculants and dispersants on gasification black water and circulating ash water were analyzed.By comparing the addition effects of different kinds of flocculants and dispersants,the flocculant and dispersant suitable for the dry pulverized coal gasification process were selected.Under the condition of appropriate addition volume of the two additives determined by the test,the total dissolved mass concentration of circulating ash water after the treatment was less than 3 500 mg/L,the total hardness(in terms of CaCO3)was less than 1 500 mg/L,the total alkalinity was less than 10 mmol/L,and the suspended matter was less than 40 mg/L.The operation cycle of the gasification device was extended to more than 200 days,the overhaul cycle was shortened to 18 days.And the consumption cost of the agent was reduced.
dry pulverized coal gasificationblack water treatmentash waterflocculantdispersant
万方数据
维普
