Energy saving CFB boilers manufacturer

Energy saving CFB boilers manufacturer

Characteristics of circulating fluidized bed:

The basic flow of a typical circulating fluidized bed boiler structure is as follows: after coal and desulfurizer are sent into the furnace, they are quickly surrounded by a large number of inert high-temperature materials, they are fired and burned, and desulfurization reaction is carried out at the same time. Under the action of the rising smoke airflow, they move to the upper part of the furnace and release heat to the water-cooled wall and other heating surfaces arranged in the furnace. After the coarse particles enter the suspension area, they deviate from the main airflow under the action of gravity and external forces and thus stick to the wall and flow down. After the gas-solid mixture leaves the furnace, it enters the high-temperature cyclone separator, and a large number of solid particles (coal particles, desulfurizer) are separated and sent back to the furnace for cyclic combustion. The unseparated fine particles enter the tail flue with the flue gas to heat the superheater, the economizer and the air preheater, and are discharged to the atmosphere through the dust collector.

1, low temperature power controlled burns: due to low level of circulating fluidized bed combustion temperature, generally between 850-900 ℃, its combustion reaction control in the dynamic combustion zone, and strong mixed with a large number of solid particles, in this case the combustion rate depends mainly on chemical reaction rate, is determined by the temperature level, and physical factors are no longer control the combustion speed is the dominant factor. The combustion efficiency of circulating fluidized bed can reach 98%-99%.

2, high speed, high concentration and high flux of solid materials fluidized circulation process: in the circulating fluidized bed boiler materials involved in the internal circulation within the chamber of a stove or furnace and the furnace, separator, and returns unit composed of two cycles, the whole process of combustion and desulfurization process are gradually in the process of the two circular motion.

3, high intensity heat, mass and momentum transfer process: in the circulating fluidized bed boiler, the amount of material circulation in the furnace can be artificially changed to adapt to different combustion conditions.

Material separation system is the structural characteristic of circulating fluidized bed boiler. A large amount of materials participate in the circulation to realize the controlled combustion process in the whole furnace, which is the fundamental characteristic of circulating fluidized bed boiler that is different from bubbling fluidized bed boiler, because the combustion of bubbling fluidized bed boiler mainly occurs in the bed. Therefore, the circulating flow bed boiler combustion must have three conditions :(1) to ensure a certain fluid speed, but also to ensure that the particle size of the material in the appropriate, the bed in the rapid flow area particle size. (2) there should be enough material separation. (3) there should be material return, and adequate measures should be taken to maintain the balance of materials.

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