Coal-fired nitrogen reduction method for cement kiln

Abstract

The invention discloses a coal-fired nitrogen reduction method for a cement kiln, which belongs to the field of preparation of building consumables and comprises the following steps: preparing a raw material; firing the raw material to obtain clinker; and carrying out nitrogen reduction treatment. In the clinker firing process, the charging temperature of the necking of a smoke chamber needs to becontrolled, the charging temperature of the necking of the smoke chamber is controlled as low as possible on the basis that the firing effect is ensured, and the charging temperature of the necking of the smoke chamber is controlled to be not higher than 1100 DEG C. Thus, the reducing atmosphere can be increased, the production of nitrogen oxides can be reduced, the consumption of ammonia water can be reduced, the cost of nitrogen removal is greatly reduced, and the use of fuel is reduced. By adopting a novel raw material formula, the cyclic utilization of the construction waste is greatly increased, the cost is reduced, the waste is turned into wealth, the development of circular economy is promoted, the pollution is reduced, the ecological environment is protected, and the method has agood market prospect.

Description

technical field [0001] The invention relates to the field of construction consumables preparation, in particular to a method for reducing nitrogen by burning coal in a cement kiln. Background technique [0002] Cement, powdery hydraulic inorganic gelling material. After adding water and stirring, it becomes a slurry, which can be hardened in the air or better hardened in water, and can firmly bind sand, stone and other materials together. The mixture of lime and volcanic ash in the early days is very similar to lime pozzolanic cement [1], use it to glue concrete which made of crushed stone. After hardening, it not only has high strength, but also can resist the erosion of fresh water or salt water. For a long time, as an important cementing material, it is widely used in civil engineering, water conservancy, national defense and other projects. [0003] Cement rotary kiln belongs to building material equipment and is a kind of lime kiln. It belongs to the category of buil...

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Problems solved by technology

[0005] With the progress of human society, the demand for cement is increasing day by day, but in the clinker firing stage in the cement production process, a large amount of nitrogen oxides will be produced, which will cause environmental pollution, which is not conducive to environmental protection and circular economy At present, ammonia water is often used to react with it to remove nitrogen oxides, but this method will greatly increase the production cost of cement, and the production and preparation of ammonia water will also produce substances that pollute the environment

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