Method for reburning denitration of cement kiln by using alternative fuel

An alternative fuel and reburning technology, applied in the field of combustion, can solve the problems such as difficult to meet the emission targets of nitrogen oxides, and achieve the effect of protecting clean level, low operating cost and good comprehensive environment

Active Publication Date: 2014-02-05
天津中材工程研究中心有限公司
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Problems solved by technology

According to the national cement industry denitrification and emission reduction control requirements during the "Twelfth Five-Year Plan" period, it is difficult to meet the nitrogen oxide emission indicators stipulated in GB4915-2013 "Emission Standards of Air Pollutants for the Cement Industry" if the existing staged combustion technology is adopted

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  • Method for reburning denitration of cement kiln by using alternative fuel
  • Method for reburning denitration of cement kiln by using alternative fuel
  • Method for reburning denitration of cement kiln by using alternative fuel

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Embodiment Construction

[0037] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0038] See Figure 1 ~ Figure 4Generally, the calciner adopting the staged combustion technology can be divided into two parts, the calciner reduction combustion area 14 and the calciner fuel burnout combustion area 6, according to the combustion and air supply conditions of the fuel in the calciner. The hot flue gas in the kiln from the rotary kiln 18 is depleted of oxygen and gas. In the calciner adopting fuel staged combustion technology, the cone 3 at the bottom of the calciner or the denitrification reduction combustion chamber 2 set above the ascending flue 1 of the kiln tail smoke chamber utilizes the oxygen-depleted gas in the kiln from the rotary kiln 18 as the combustion-supporting air. 0-80% of the fuel in the calciner is reburned...

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Abstract

The invention discloses a method for reburning denitration of a cement kiln by using alternative fuel. The reburning alternative fuel is added to a reducing combustion area inside a decomposing furnace of adopting a grading combustion technology; the adding amount of the reburning alternative fuel is 0-80% of total mass of fuel of the decomposing furnace; the reburning alternative fuel is a refuse derived fuel of which the volatile content is greater than or equal to 30% and / or waste alternative fuel of which the amino content is greater than or equal to 3%. By leading in a reburning process of the alternative fuel, atmosphere control is flexible; no significant effect is generated on operation of a cement kiln system; a burning intermediate product is high in decomposition degree, and small in impact on the existing fractional combustion system, and does not generate a new atmospheric pollutant; the operation of the existing cement kiln system is not affected in the transformation process. Compared with the conventional denitrified reburning fuel, the alternative fuel has higher volatile content and amino content, and has higher denitration efficiency in the burning process.

Description

technical field [0001] The invention belongs to combustion technology, in particular to a method for denitrification by recombustion of alternative fuels used in cement kilns. Background technique [0002] The cement industry uses coal as the main energy source. Based on the constraints of the cement clinker firing process, as a typical high-temperature process, the nitrogen oxide emission of the cement industry is at a relatively high level. In 2011, the standard coal emission of the cement industry was as high as 15kgNO 2 / t standard coal, the task of controlling nitrogen oxide emission reduction in the cement industry is quite arduous and arduous. At present, the calciner, which accounts for about 60% of the fuel consumption, is used for functional structure design. By adding combustion fuel and combustion-supporting air step by step, the formed nitrogen oxides are further reduced and consumed on the basis of limiting the formation of nitrogen oxides in the furnace. The...

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Application Information

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IPC IPC(8): B01D53/56B01D53/76
Inventor 沈序辉郑金召王永刚程兆环
Owner 天津中材工程研究中心有限公司
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