Stable combustion method of coal water slurry boiler and device thereof

Abstract

The invention discloses a stable combustion method of coal water slurry boilers and a device thereof. The furnace of the coal water slurry boiler is divided into two, twin-furnace structure is used to form two combustion chambers which are a main combustion chamber and an auxiliary combustion chamber, the two combustion chambers are arranged in 7-shape, the main combustion chamber is bigger than the auxiliary combustion chamber, load of the main combustion chamber accounts for 65-75% of the total load of the boilers during boiler combustion, and load of the auxiliary combustion chamber accounts for 25-35% of the total load of the boilers. An outlet of the auxiliary combustion chamber is arranged on front side of the main combustion chamber. A certain number of water walls are arranged in the main combustion chamber; the auxiliary combustion chamber is of heat insulated structure, and is a heat insulated combustion chamber; and volume of the auxiliary combustion chamber is small, ignition is easy, warming is rapid, and external heat transmission is low. When combustion capacity of coal water slurry is changed, changes of room temperature and thermal load of sections are small; so the coal water slurry in the auxiliary combustion chamber can still be in stable ignition and combustion, when the coal water slurry boilers are running at the load which is less than 50% of the total load. The main combustion chamber and the auxiliary combustion chamber are provided with corresponding main burners and auxiliary burners respectively.

Description

technical field [0001] The invention relates to a boiler combustion method and a boiler structure, in particular to a boiler combustion and a boiler for burning coal-water slurry. This kind of combustion method can make the coal-water slurry burn stably in the boiler. Background technique [0002] Coal-water slurry is a coal-based liquid fuel that is physically deep-processed with coal, water, and additives. It is environmentally friendly with low ash and low sulfur, and is an environmentally friendly clean fuel. The development of coal water slurry has always been a clean energy project focused on by the country. The country has issued a number of related policies and documents. Therefore, coal water slurry and coal water slurry boilers have very broad prospects in our country. [0003] Coal-water slurry contains 35-40% water, and its combustion process goes through three stages: water evaporation, volatile matter ignition and fixed carbon combustion, and its ignition poin...

AI Technical Summary

Problems solved by technology

However, this patent still does not solve the problem that it is difficult to ignite and burn stably when the coal-water slurry industry and domestic boilers operate under a load of less than 50%.

[0006] However, the existing coal-water slurry boiler technology has not effectively solved the problems that the coal-water slurry boiler is difficult to ignite and burn stably when the load is lower than 50%, and it must be burned with oil when the load is lower than 50%. need to improve

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