Method and device for burning coal slime in circulating fluidized bed boiler

Abstract

The invention relates to a method and device for burning coal slime in a fluidized bed boiler. When the coal slime is burned in a medium and small-capacity circulating fluidized bed boiler, the way of feeding at the top of a furnace chamber is adopted; as the feeding point of the coal slime is near to the outlet of the furnace chamber, a large amount of the coal slime can fly out of the furnace chamber under the situation that the coal slime is not burned completely, and the burning efficiency is very low. The invention discloses the method for burning the coal slime in the circulating fluidized bed boiler, and the technical process of the method is as follows: sending the pasty coal slime into a dense phase region at the lower part of the furnace chamber of the circulating fluidized bed boiler, utilizing a device for burning the coal slime in the circulating fluidized bed boiler to smash the falling coal slime into small particles and disseminate the particles into the furnace chamber, mixing the coal slime with ascending smoke gas and recyclable materials, and then burning in the furnace chamber. The method and the device are used for burning the coal slime in the circulating fluidized bed boiler.

Description

Technical field: [0001] The invention relates to a method and a device for burning coal slime in a circulating fluidized bed boiler, in particular to a coal slime atomizing combustion method in a fluidized bed boiler and the structural design of the atomizing device. Background technique: [0002] Coal slime is a by-product produced in the production process of coal mines. Due to its high moisture content and muddy shape, it cannot be used in conventional thermal power generation units. At present, only circulating fluidized bed boilers can be used to burn coal slime. In the early stage, small and medium capacity circulating flow When burning in the chemical bed boiler, the feeding method is adopted at the top of the furnace. Since the feeding point of the coal slime is close to the outlet of the furnace, a large amount of coal slime flies out of the furnace without burning out, and the combustion efficiency is extremely low. Invention content: [0003] The object of the p...

AI Technical Summary

Problems solved by technology

[0002] Coal slime is a by-product produced in the production process of coal mines. Due to its high moisture content and muddy shape, it cannot be used in conventional thermal power generation units. At present, only circulating fluidized bed boilers can be used to burn coal slime. In the early stage, small and medium capacity circulating flow When burning in the chemical bed boiler, the feeding method is adopted at the top of the furnace. Since the feeding point of the coal slime is close to the outlet of the furnace, a large amount of coal slime flies out of the furnace without burning out, and the combustion efficiency is extremely low.

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