1, the cement production process, summed up as "two of a burning ground", namely:
(1) production configuration and fine grinding: main raw material for manufacturing cement is limestone and clay, and some needed to join iron, is now in order to save clay, generally used in power plant ash, coal gangue alternatives such as clay. In proportion with the raw material, finely ground mixture obtained as raw material.
(2) calcined raw meal: raw material in the rotary furnace or kiln, the use of 1350-1450 ℃ calcined, in which part of the material melting, cooling or fast-like granular materials are known as clinker.
(3) Common Ground clinker and the amount of gypsum, and finally get the finished product is Portland cement.
2, calcining cement clinker kiln with kiln and the kiln, commonly used in China and medium-sized cement kiln, vertical kiln has been phased out. Back converter is a combustion device, divided into wet and dry kiln kiln. High temperature combustion of coal gas and the material in the cylinder body opposite movement, in the course of the campaign for heat exchange, receipt of materials and high temperature hot gas flame heat to pass through a series of physical and chemical changes after being calcined mature material.
3, according to the cement production process and the combustion characteristics of rotary kilns, wet process kiln coal requirements: dry ash (Ad) ≤ 28%, dry basis volatile (Vd) 18% -30%, received calorific ( Qnet, ar) ≥ 20. 908MJ/KG. Dry kiln coal requirements: dry ash (Ad) ≤ 25%, dry basis volatile (Vd) 18-30%, received calorific (Qnet, ar) ≥ 22. 999MJ/KG.
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