Most coal injection systems have similar flow sheets for preparing coal for injection, As shown in Figure 2, raw coal with a size-consist range of 50 x 0 mm (2 x 0 inches) is fed to a grinding mill, where it Is dried and pulverized in one step. Waste gas from the blast furnace stoves can be used for the drying operation to lower operating costs. However, some additional fuel may be required to obtain the proper gas temperatures. An inert atmosphere must be maintained in the system to prevent fires and explosions. The coal/gas stream from the mill then passes through a cyclone, where the primary separation of solids and is made. A bag filter is used to clean the gases before they are discharged to the atmosphere. The coal next is discharged for transport to the furnace injection facility storage bin. The coal preparation system capital cost represents two-thirds of the total capital requirements of a coal injection system.
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机译：大多数喷煤系统具有类似的流程，可用于制备喷煤。如图2所示，尺寸组成范围为50 x 0 mm（2 x 0英寸）的原煤被送入磨煤机进行干燥一步就粉碎了高炉炉子产生的废气可用于干燥操作，以降低操作成本。但是，可能需要一些额外的燃料才能获得合适的气体温度。系统中必须保持惰性气氛，以防止起火和爆炸。然后，来自磨机的煤/气流通过旋风分离器，在那里对固体进行初步分离。袋式过滤器用于在将气体排放到大气之前清洗气体。接下来排出的煤被运输到炉子喷射设备存储箱。选煤系统的资本成本占注煤系统总资本需求的三分之二。
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