Gas-solid mixing combustion hot-air oven with double towers and double furnace cavities

Abstract

The invention discloses a gas-solid mixing combustion hot-air oven with double towers and double furnace cavities. The hot-air oven is mainly composed of an aerification tower (3), a mixing combustion tower (9), a heat exchanger (13), a hot air draught fan (18), a cooling fan (6), an air exhaust fan (14) and an igniter (2), a cooling air pipe (5), a double-tower cooling air converging air flue (15), a mixing air pipe (17), a guide cylinder (23) and like, wherein the aerification tower is of a clamping sleeve structure, and an aerification tower cooling air flue is arranged in annular space between an aerification furnace cavity and an aerification tower shell; the mixing combustion tower is of the clamping sleeve structure, and a mixing combustion tower cooling air flue is arranged in annular space between a mixing combustion furnace cavity and a mixing combustion tower shell; and the double-tower cooling air converging air flue is communicated with the aerification tower cooling air flue, the mixing combustion tower cooling air flue and the mixing air pipe. The mixing combustion hot-air oven provided by the invention is suitable for burning fuels such as coal dust particle diameter of which is less than 1mm, rice hull and the like, the fuels can be secondly combusted, the furnace cavity temperature can achieve 600 DEG C-1200 DEG C, and ash content in a burning process can be recycled through a continuous dry method; and on-line control of the burning process is realized through two phase flow concentration and flow control.

Description

technical field [0001] The invention belongs to the technical field of solid fuel combustion equipment, in particular to granular and powdery solid fuel combustion technical equipment, in particular to a gas-solid mixed combustion hot blast stove with double towers and double hearths. Background technique [0002] As the prior art, there are many types of combustion equipment for burning pulverized coal, such as straight-through type, vortex type, and reflux type. A common feature of these pulverized coal combustion furnaces is that they have high requirements on the particle size of pulverized coal. Only when the particle size of the pulverized coal is less than 20 μm, the pulverized coal can flow with the air like a liquid fuel, and catch fire and burn during the flow. Due to the limited volume of the furnace, the time for air to pass through the furnace is short, so when the particle size of the pulverized coal is greater than 20 μm, the pulverized coal may not burn, and...

AI Technical Summary

Problems solved by technology

However, pulverized coal with a particle size of less than 20 μm requires special equipment for processing, and is not easy to store and transport long-term, thus increasing the supporting facilities of pulverized coal combustion furnace and the cost of pulverized coal preparation

The above-mentioned biomass combustion furnaces are all equipped with a fixed or moving grate. The biomass fuel burns above the grate, and its combustion temperature and speed are much lower than those when it is suspended in the air, so the tar and other substances in the flue gas are very small. It is difficult to reach the pyrolysis temperature, thereby reducing the combustion efficiency and equipment service life, and increasing the operation and maintenance costs of the equipment

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