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论述了采用ＳＴＤ系统Ⅱ工业控制机建立洗煤厂浮选ＤＤＣ控制系统，除控制总入料流量、浓度外，还对两台浓缩机的底流配比进行控制，建立了新的给药量模型，并且在控制系统中引入了人工干预变量补偿某些外界因素的影响。
Discussed the application of STD system Ⅱ industrial control machine to establish the flotation DDC control system of coal preparation plant. In addition to controlling the total feed flow and concentration, it also controlled the underflow ratio of two thickeners and established a new dosing model. In the control system, artificial intervention variables are introduced to compensate for the influence of some external factors.