Ignition method and apparatus for fossil fuel

Abstract

An ignition method and arrangement for fossil fuel is provided, which pertains to the technical field of combustion and equipment. In the invention, before a primary air flow containing powder fuel enters into a combustion chamber, the primary air flow is gradated, then the thick powder air flow is divided into a bigger and a smaller whiff, wherein, the flow area of the channel for the smaller whiff accounts for 15-40% of the total area of the channel for the thick powder air flow. The smaller whiff of thick-powder air flow is mixed with an air flow with high oxygen concentration, so that the oxygen concentration in the smaller whiff of thick-powder air flow is 22-95%, and the stoichiometric ratio of oxygen to the fuel is 0.4-1.2. By improving the pyrolyzation and reaction condition, the invention accelerates and increases the separation out and pre-stage firing of the volatile components of the fossil fuel, improves greatly the firing property of air flow, can realize the firing and low-load steady combustion of fossil energy with low volatile components without using combustion-supporting oil or reducing greatly the use of combustion-supporting oil; in addition, in the invention a steady small flame can be formed, the primary air flow is fired by a way of igniting a big fire through a small flame, this greatly saves the oxygen consumption during the ignition.

Description

technical field [0001] The invention relates to an ignition technology and equipment for fossil fuels, in particular to an ignition technology and equipment for powdery suspension combustion of fossil fuels (including coal, coke powder, and petroleum coke), mainly for boilers, and can also be furnaces , heating furnace, coal gasification generator, etc. It belongs to the field of combustion technology and equipment technology. Background technique [0002] Fossil fuel powdered suspension combustion equipment, such as pulverized coal boilers, consume a considerable amount of fuel for ignition when the furnace is started from a cold furnace. Generally, the fuel consumption per hour is about one-third of the rated combustion heat of the boiler, and continuous combustion is required. After a few hours, all parts of the furnace reach a high temperature before switching from burning oil to burning coal, which consumes a lot of fuel. In addition, when the load decreases or the qua...

AI Technical Summary

Problems solved by technology

But the main purpose of this technology is to improve flame stability and reduce NOx emissions, not for fuel saving

The highest concentration of oxygen after the mixture of concentrated airflow and high oxygen concentration airflow is 35%, and it is used for ignition and low-load stable combustion of low-volatile fossil fuels such as low-quality bituminous coal, lean coal, anthracite, and petroleum coke. Fuel-saving effect is not ideal

Because oxygen is added to the whole concentrated stock obtained from the concentration separation of the primary air, increasing the oxygen concentration one-sidedly will bring the disadvantage of excessive oxygen consumption, and the economy is poor

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