Tail gas utilization method and tail gas utilization system of rotary lime kiln

Abstract

The invention provides a tail gas utilization system of a rotary lime kiln, which uses tail gas of the rotary lime kiln as a drying medium to dry semi-coke, achieves the effects of waste gas utilization and energy consumption reduction, and reduces the damage rate and the probability of spontaneous combustion of the semi-coke. The system comprises a dust remover and a vertical dryer, wherein the semi-coke is arranged in the vertical dryer; and a tail gas emission pipe of the rotary lime kiln, the vertical dryer and the dust remover are connected in sequence. The invention simultaneously provides a tail gas utilization method of the rotary lime kiln, which comprises the steps that the tail gas of the rotary lime kiln is led into the vertical dryer and directly contact with the semi-coke in the vertical drier, so as to dry the semi-coke; and gas emitted by the vertical dryer is evacuated after dust of the gas is removed by the dust remover.

Description

technical field [0001] The technology relates to a method and a system for utilizing the tail gas of a lime rotary kiln, in particular to a method and a system for comprehensively utilizing the tail gas of a calcium carbide furnace and the tail gas of a lime rotary kiln. Background technique [0002] Calcium carbide furnace tail gas is the tail gas produced in the process of calcium carbide furnace production. There are more than 400 calcium carbide furnaces in China's calcium carbide industry, and the annual output ranks first in the world. However, it has always been a major problem to use the heat energy of the calcium carbide furnace tail gas and to purify and meet the emission standards. The extremely serious pollution has always plagued the healthy development of my country's calcium carbide industry. Due to the special nature of the dust in the tail gas of calcium carbide furnace, the dust particles are fine, the specific surface area is large, the specific gravity is...

AI Technical Summary

Problems solved by technology

This drying method has the following disadvantages: semi-coke is easily broken, and the damage rate is high, which is not conducive to the production of calcium carbide (broken semi-coke with too small particle size cannot be used to produce calcium carbide), which increases the production cost of calcium carbide; Oxygen content is high, and semi-coke is prone to spontaneous combustion during the drying process, which has certain safety hazards

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