Problems with delayed coking

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1. The density of the mixed feedstock in delayed coking is generally (　　). A、 300-500kg/m3 B、 500-700kg/m3 C、 700-900kg/m3 D、 900-1100kg/m3 2、 The air distributor must ensure an adequate supply of air at the base of the flame, in order to prevent the fuel oil from cracking due to lack of oxygen when heated, thereby causing (　　). A. Bright flame B. Black smoke C. White smoke D. Yellow flame 3. Heavy residue oil (　　). A. High content of heavy metals, high content of resins and asphalts. B. Low content of heavy metals, high content of resins and asphalts. C. High content of heavy metals, low content of resins and asphalts. D. Low content of heavy metals, low content of resins and asphalts. 4. The four-way valve has four channels; during normal coking, how many of these channels have fluid flowing through them at the same time?