Device capable of adjusting primary air injection flow velocity

Abstract

The invention discloses a device capable of adjusting the primary air injection flow velocity. The device comprises a primary air duct, a baffle and an adjusting handle, wherein the baffle is arrangedat the position, close to an outlet, in the primary air duct, and a connecting section of the adjusting handle penetrates through a circular through hole to be matched with a groove in the upper partof the baffle. According to the device, the structure at the outlet of the primary air duct is changed by adjusting the angle between the baffle at the outlet of the air duct and the primary air duct, so that primary air can be sprayed out of an air supply pipe at an enough speed under the condition of small primary air flow, the primary air is reasonably distributed in a boiler, and the boiler air supply requirements for flexible peak regulation of a coal-fired unit are met; and meanwhile, the primary air duct and a baffle adjusting mechanism are sealed by the structure through the cooperation of an inner helical gear and an outer helical gear.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a device capable of adjusting the jet velocity of primary air. Background technique [0002] In 2018, China's thermal power generation accounted for about 73% of my country's total power generation. Boilers are the core equipment for thermal power generation. The combustion conditions in the furnace and the heat transfer conditions of the furnace wall directly determine the heat transfer efficiency of the boiler. The combustion process in the furnace Among them, the distribution of the primary air directly determines the combustion of the boiler. [0003] In recent years, with the gradual increase in the installed capacity of clean electric energy, traditional coal-fired power stations have gradually turned to the flexible peak-shaving role of the power grid. When the power generation load of the power station becomes 75%, 50% or 30% of the full load, the power station The fuel v...

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Problems solved by technology

[0003] In recent years, with the gradual increase in the installed capacity of clean electric energy, traditional coal-fired power stations have gradually turned to the flexible peak-shaving role of the power grid. When the power generation load of the power station becomes 75%, 50% or 30% of the full load, the power station The fuel volume of the boiler will be reduced accordingly, and the primary air supply volume of the boiler must be adjusted in time. However, when the primary air supply volume is reduced, if the structure at the outlet of the primary air duct remains unchanged, If the velocity of the primary air blowing out from the outlet of the air pipe becomes smaller, the primary air and the pulverized coal carried by the primary air will not be evenly distributed in the furnace, which will affect the combustion effect of the pulverized coal in the furnace

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