Low-NOx clean combustion type rotary kiln and combustion control method thereof

Abstract

The invention discloses a low-NOx clean combustion type rotary kiln and a combustion control method thereof. The low-NOx clean combustion type rotary kiln comprises a rotary kiln body (1), a center burner (3) and a secondary air pipe (2). The center burner (3) and the secondary air pipe (2) are arranged on the rotary kiln body (1). The low-NOx clean combustion type rotary kiln is characterized in that the secondary air pipe (2) comprises a secondary air header pipe (21) and a plurality of secondary air branch pipes (22) communicating with the secondary air header pipe (21). The secondary air branch pipes (22) are each provided with a flow valve (4) and are led into the rotary kiln body (1) from different positions of a kiln head box of the rotary kiln body (1) correspondingly in a multiple-point mode. According to the low-NOx clean combustion type rotary kiln and the combustion control method thereof, long-time fixed overlapping of an oxygen-rich area and a high-temperature area can be avoided in the rotary kiln, thus the NOx generation rate is lowered effectively, and clean production of a rotary kiln system is achieved.

Description

technical field [0001] The invention relates to the technical field of rotary kiln, in particular to the rotary kiln which is the core component in the pelletizing process. The invention also relates to the combustion control method of the rotary kiln. Background technique [0002] The rotary kiln is a core equipment in the pelletizing process, and its operation directly affects important indicators such as the finished product rate, energy consumption index, operating rate, and environmental protection index of the entire pelletizing process. The function of the rotary kiln is to use the high-temperature flame generated by the central burner to heat the kiln to form a high-temperature atmosphere, thereby roasting the pellets entering the rotary kiln. [0003] As the country pays more and more attention to energy conservation and environmental protection, harmful substances such as NOx and sulfur dioxide emitted by industrial furnaces during production have been strictly co...

AI Technical Summary

Problems solved by technology

[0005] The secondary air single-point steady-flow heating method can easily form a high-temperature, oxygen-enriched operating area at a local point in the kiln for a long time, resulting in an accelerated formation rate of nitrogen oxides in this area and a substantial increase in the amount of nitrogen oxides, which in turn causes furnace The content of nitrogen oxides in the internal flue gas is high, increasing the pressure of the subsequent denitrification process

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