Variable-resistance energy-saving blast cap

Abstract

The invention provides a variable-resistance energy-saving blast cap. A core tube is movably sleeved with an inner cover, the size of a gap between the inner cover and the core tube can be changed when primary air is introduced, during operation under low load, the air volume of the introduced primary air is relatively small, at the moment, the gap between the inner cover and the core tube is relatively small, resistance produced when air flow flows through is relatively large, and therefore, uniform air distribution of multiple blast caps when air volume is small is realized; and during operation under high load, the air volume of the introduced primary air is relatively large, at the moment, the gap between the inner cover and the core tube is relatively large, and resistance produced when air flow flows through becomes small, so that energy consumption of a draught fan during operation under high load is reduced. Uniform air distribution with small air volume under low load can be realized, oxygen content is reduced, and NOx emission is reduced; and uniform air distribution with large air volume and small resistance under high load can be realized, energy consumption of the draught fan is reduced, and boiler efficiency is improved.

Description

technical field [0001] The invention belongs to the field of circulating fluidized bed boilers, and in particular relates to a variable-resistance energy-saving wind cap. Background technique [0002] The resistance and structural form of the air distribution plate hood of circulating fluidized bed boilers have a great influence on the fluidization of bed material and the economical efficiency of boiler operation. Appropriate resistance can make the air volume distribution through the air cap uniform, so that the fluidization in the furnace can be uniform, and local poor fluidization and high temperature phenomena can be avoided; from the perspective of fluidization air distribution uniformity, the greater the resistance, the more suitable, but the greater the resistance , the greater the primary wind pressure loss, the greater the current of the primary fan, and the greater the energy consumption of the boiler operation. [0003] At present, the design of the conventional ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a variable resistance energy-saving hood, which solves the problem that the current hood cannot solve the problem of low-load material fluidization uniformity and oxygen excess.

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