Device and process for treating waste gas of vanadium-titanium reducing rotary kiln

Abstract

The invention discloses a device and a process for treating waste gas of a vanadium-titanium reducing rotary kiln. The device comprises a high-temperature waste gas cooling device, a primary air ejector device, an ignition and combustion-stabilization heat storage device, a secondary air device, a combustion chamber and a throat mixing region, wherein the secondary air device is arranged in the inner wall of the combustion chamber in a circumferential direction; a primary air inlet of the primary air ejector device is connected with a tubular heat exchanger of a high-temperature waste gas cooling device; a tube pass outlet of the tubular heat exchanger of the high-temperature waste gas cooling device is connected with a hot primary air pipeline of the primary air ejector device; a primaryhot air spray hole of the primary air ejector device is positioned on the central axis of the primary air ejector device and is opposite to the throat mixing region; the ignition and combustion-stabilization heat storage device is arranged in the throat mixing region and extends to the combustion chamber; and the throat mixing region is a shrinkage and diffusion structure. The device is used for treating waste gas into safe waste gas not containing combustible matters according to technological requirements and waste gas components, so that heat of combusted waste gas is recycled through heatrecycling equipment such as a waste gas boiler, and up-to-standard emission is guaranteed.

Description

technical field [0001] The invention relates to the field of waste gas treatment of a vanadium-titanium pre-reduction rotary kiln, in particular to a device and a process for treating waste gas of a vanadium-titanium reduction rotary kiln. Background technique [0002] In a vanadium-titanium production process, the vanadium-titanium ore is pre-reduced through rotary kiln equipment. The rotary kiln is a positive pressure reducing atmosphere without O 2 . The air outlet of the rotary kiln is required to control the slight positive pressure (10-30pa). After the pre-reduction reaction will produce a small amount of H 2 , CO (combustible content ≤ 15%) and higher dust content (about 20 ~ 30g / Nm 3 ) high-temperature (600-700°C) combustible exhaust gas. The ash contains a large amount of carbon powder (C), and this part of the exhaust gas must be treated before it can be discharged. Due to the low content of combustibles, the temperature of the mixed high-temperature air and ...

AI Technical Summary

Problems solved by technology

Due to the low content of combustibles, the temperature after mixing high-temperature air and cold air is about 350°C, and due to the influence of non-combustible substances, this exhaust gas is not easy to burn stably and completely

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