High-temperature fume furnace of circulating fluidized bed and control method thereof

Abstract

This invention discloses a high-temperature fume furnace of a circulating fluidized bed. The fume furnace comprises a hearth, an air distributor, a pneumatic spreader stroker, a secondary air and inert gas device, a cyclone separator, a feedback unit and a tail flue, wherein the outlet of the air distributor and the spreading opening of the pneumatic spreader stroker are both connected with the hearth; the secondary air and inert gas device is also communicated with the hearth; the outlet of the hearth is connected with the inlet of the cyclone separator; one end of the feedback unit is connected with the solid outlet of the cyclone separator, while the other end thereof is communicated with the hearth; and the tail flue is connected with the gas outlet of the cyclone separator. The high-temperature fume furnace of the circulating fluidized bed of the invention can improve the combustion efficiency and the capacity of the fume furnace, control the combustion temperature of the health,prevent coking in the hearth, and keep the oxygen content of the gas of below 8 percent at the outlet.

Description

technical field [0001] The invention relates to a flue gas furnace, in particular to a circulating fluidized bed high temperature flue gas furnace and a control method thereof. Background technique [0002] Flue gas furnaces are widely used in drying, calcination and other operations in industrial production. Taking the ordinary fluidized bed flue gas furnace in the prior art as an example, on the one hand, the fluidized bed flue gas furnace is prone to local failure of normal fluidization due to low fluidization gas velocity and uneven air distribution, resulting in the problem of "dead bed" ; Therefore, the capacity of the fluidized bed flue gas furnace is generally below 20MW, and it is difficult to increase the capacity. On the other hand, there are a large amount of coal ash and unburned fine carbon particles in the generated flue gas, which affects the combustion efficiency and flue gas quality. At the same time, the furnace wall of the fluidized bed flue gas furnace...

AI Technical Summary

Problems solved by technology

Taking the ordinary fluidized bed flue gas furnace in the prior art as an example, on the one hand, the fluidized bed flue gas furnace is prone to local failure of normal fluidization due to low fluidization gas velocity and uneven air distribution, resulting in the problem of "dead bed" ; Therefore, the capacity of the fluidized bed flue gas furnace is generally below 20MW, and it is difficult to increase the capacity

On the other hand, there are a large amount of coal ash and unburned fine carbon particles in the generated flue gas, which affects the combustion efficiency and flue gas quality

At the same time, the furnace wall of the fluidized bed flue gas furnace also has disadvantages such as easy bulge, crack and collapse.

[0003] In addition, the above-mentioned fluidized bed flue gas furnace usually uses a high excess air coefficient to control the temperature of the flue gas at the outlet, so the oxygen content of the flue gas at the outlet is relatively high, and it will be dangerous when used for drying flammable and explosive materials.

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