Multi-bed linkage fluidized bed roasting furnace

Abstract

A multi-bed linkage fluidized bed roasting furnace comprises a feeding device, a combustion chamber, a top passing flue arranged at the top of the combustion chamber, a cold slag device and a cyclone separator connected behind the top passing flue. Roasting beds at two or more levels are arranged under the combustion chamber, each roasting bed at the previous level and the corresponding roasting bed at the next level are arranged in a stepped mode, each roasting bed comprises an air chamber, an air distributing plate, air caps arranged on the air distributing plate and a slag discharging pipe on the bed, and an additive opening for adding calcium-based additives or combustion-supporting coal is formed in the upper portion of each roasting bed; the cold slag device is arranged behind the roasting bed at the last level. The height difference h between each roasting bed at the previous level and the corresponding roasting bed at the next level is 100-300 mm, wherein the roasting beds are arranged in the stepped mode. The multi-bed linkage fluidized bed roasting furnace has the advantages of being high in roasting efficiency and treating roasting flue gas well.

Description

technical field [0001] The invention relates to a multi-bed linkage fluidized bed roaster, which belongs to the field of inferior fuel, especially stone coal roasting and utilization equipment. Background technique [0002] Stone coal is a kind of ore containing vanadium, and it is one of the important raw materials for extracting and preparing vanadium pentoxide. At present, stone coal roasting methods include sodium salt roasting method, calcium salt roasting method and blank roasting method, each of which has advantages and disadvantages. As one of the cores of the vanadium purification process, roasting is very critical. Rotary kiln is the main roasting equipment, but the high initial investment is difficult to use in small and medium-sized enterprises, while commonly used roasting equipment such as small flat kiln and small soil shaft furnace have serious pollution and high energy consumption. The flat kiln was first used in stone coal roasting. It is a layer-fired t...

AI Technical Summary

Problems solved by technology

Rotary kiln is the main roasting equipment, but the high initial investment is difficult to use in small and medium-sized enterprises, while commonly used roasting equipment such as small flat kiln and small soil shaft furnace have serious pollution and high energy consumption

The flat kiln was first used in stone coal roasting. It is a layer-fired type with a relatively simple structure and low investment, but the roasting conditions are not easy to control, the temperature distribution is uneven, the conversion rate of roasting materials varies greatly, and the floor area is large, and the working conditions are poor.

Multi-hearth furnace roasting equipment has a large inner diameter and is divided into multiple layers. Materials are input from the upper part of the furnace. From top to bottom, there are dehydration preheating zone, firing zone and cooling zone. The roasting effect is good, but the structure is complex and there are many auxiliary equipment. Vulnerable equipment

Fluidized fluidized furnace materials are fed from the top of the furnace, and the materials are in good contact with air, which can achieve a higher roasting temperature. The decarburization of stone coal is complete and the conversion rate is high. However, the amount of dust in the roasting flue gas is large, resulting in a relatively large amount of material taken away by the flue gas. more, it is necessary to add efficient dust removal equipment at the end of the equipment

When the rotary kiln is roasting, the kiln is divided into three working areas, namely the preheating area, roasting area and cooling area, which can realize the continuous large-scale production of stone coal roasting, but the roasting equipment occupies a large area and the roasting temperature is difficult to control

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