High-efficiency coupling, polygeneration, and low-nitrogen coal gangue activation process

Abstract

A high-efficiency coupling, polygeneration and low-nitrogen coal gangue activation process includes the following process steps: A. a coal gangue raw material is subjected to wide preheating to obtainfirst coal gangue having a water content of less than 0.8%; B. the first coal gangue is subjected to field effect low nitrogen roasting to obtain a first activated powder product and a high temperature flue gas; C. the high temperature flue gas is subjected to residual heat coupling adjustment to obtain a second activated powder product, a low temperature flue gas recycled to the step A to participate in the wide preheating and low temperature air recycled to the step B to participate in the field effect low nitrogen roasting. The process adopts the combination of mechanical, high temperatureand chemical three activation modes, the activation effect almost reaches the limit, the activation is no longer a single roasting process, the thermal energy in the flue gas is fully utilized, and the coupling adjustment form is designed, the material itself is preheated for drying, combustion air is preheated, and external heat is supplied.

Description

【Technical field】

[0001] The invention relates to the technical field of comprehensive utilization of coal gangue, in particular to an energy-saving and environment-friendly coal gangue activation process combined with multiple methods. 【Background technique】

[0002] At present, coal gangue is the gangue between coal seams. Its composition is diverse. It is a mixed sedimentary rock that is mined together with coal. Because of its low calorific value, poor activity, and high processing and utilization costs, it has always been regarded as waste. Its emissions are huge, accounting for 10% to 15% of coal production. At present, the annual emissions are 150 million tons, which is already one of the largest industrial solid wastes in my country. Because it occupies a large amount of land and destroys the local environment, it has endangered the healthy development of the coal industry. The comprehensive utilization of coal gangue is an ideal idea for circular economy and ecologi...

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