Air distribution method and air distribution device

Abstract

The invention provides an air distribution method. The air distribution method comprises the following steps: according to a thermal stability index of a fuel, a breaking rate of fuel and a carbon dioxide reduction rate of the fuel, determining an in-furnace calculated average particle size of the fuel; determining a first air supply speed, a first air supply oxygen concentration, a second air supply operation frequency and a second air supply operation duration according to the in-furnace calculated average particle size; and feeding the fuel and a gasifying agent into a hearth of a gasification furnace so as to carry out a gasification reaction on the fuel and the gasifying agent in the hearth of the gasification furnace, wherein the gasifying agent comprises primary air and pulse air. The step of feeding the gasifying agent into the hearth of the gasification furnace comprises the substeps of feeding primary air into the hearth of the gasification furnace through a primary air port formed in the bottom of the hearth of the gasification furnace according to a first air supply speed and the first air supply oxygen concentration, feeding the primary air into the hearth of the gasification furnace through a pulse air port formed in the bottom of the hearth of the gasification furnace, and feeding pulse air into the hearth of the gasification furnace through the pulse air port according to the second air supply operation frequency and the second air supply operation duration.

Description

technical field [0001] The invention belongs to the technical field of fuel gasification, and in particular relates to an air distribution method and an air distribution device. Background technique [0002] Coal gasification is one of the core technologies for clean and efficient utilization of coal, and it is the basis for the development of coal chemical process industries such as coal-based chemicals, coal-based clean fuels, industrial gas and polygeneration systems. Fluidized bed gasification technology is widely used in the field of industrial gas and synthetic ammonia due to its strong adaptability to coal types, sufficient gas-solid mixing, high gasification intensity, no tar and phenols in the gas, and no black water. [0003] The thermal stability of coal refers to the property that coal maintains its original particle size during high-temperature combustion or gasification. In general, the recommended coal particle size for fluidized bed gasifiers is generally 0-6...

AI Technical Summary

Problems solved by technology

Judging from the operation results, increasing the coal particle size into the furnace can solve the problem of dense phase zone and unstable material circulation in the fluidized bed furnace caused by the poor thermal stability of the coal entering the furnace, but at the same time it brings about the easy slagging of the furnace , high carbon content in the bottom slag, etc.

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