Treatment process for rotary kiln tail gas dust removal and denitration

Abstract

The invention relates to a treatment process for rotary kiln tail gas dust removal and denitration. The treatment process is particularly suitable for tail gas treatment of a lime rotary kiln. The treatment process comprises the following steps that high-temperature flue gas coming out of the kiln tail of the rotary kiln firstly enters a preheater to preheat materials, the flue gas coming out of the preheater is cooled to 210-240 DEG C by adjusting a cold air valve at the top of the preheater, the cooled flue gas enters a dust removal and denitration reactor to be subjected to dust removal anddenitration, and the purified flue gas is fed into a chimney under the action of an induced draft fan. According to the process provided by the invention, by adjusting the cold air valve at the top of the preheater, the process condition of dust removal and denitration integrated treatment can be realized, so that the complex process of cooling, dust removal and heating denitration in sequence inthe existing process is simplified, and a good dust removal and denitration effect is achieved. Correspondingly, the flue gas treatment system can be simplified, and the occupied area of the flue gastreatment system can be saved.

Description

technical field [0001] The invention relates to a kiln tail gas treatment process, in particular to a rotary kiln tail gas treatment process for dedusting and denitrification. Background technique [0002] In recent years, as the demand for lime in the steel industry, refractory industry, and calcium carbide industry has grown rapidly, the number of lime kilns in the country has also increased rapidly. The most commonly used lime roasting kilns in our country are rotary kiln, shaft kiln, etc. Among them, the flue gas of the rotary kiln has the following characteristics: a. High exhaust gas temperature (300 ° C to 280 ° C); b. SO 2 The concentration is low, which can reach the emission standard; c.NO X The concentration is relatively high, generally above 600mg / Nm3. NO X Excessive discharge of dust and dust is very harmful to the environment in which we live. If we humans inhale for a long time, it will cause respiratory diseases such as bronchi and lungs. If the average c...

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Problems solved by technology

[0004] The defects of the existing rotary kiln tail gas dust removal and denitrification process are: the dust removal and denitrification process is complicated, the temperature is lowered first and then heated up, resulting in high energy consumption and low efficiency, and the dust removal and denitrification equipment occupies a large area, which is difficult to arrange in a narrow site

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