Air and flue gas mixer

Abstract

The invention relates to the technical field of flue gas mixing devices, in particular to an air and flue gas mixer. The air and flue gas mixer comprises an outer cylinder and an inner cylinder, wherein the inner cylinder is connected with the inner wall of the outer cylinder through a support, a first shutter adjusting damper is arranged between the inner cylinder and the outer cylinder, and a second shutter adjusting damper is arranged in the inner cylinder; the first shutter adjusting damper comprises a thermal expansion mechanism, a first reset mechanism and a plurality of fan-shaped baffles rotationally connected between the inner cylinder and the outer cylinder, baffle shafts of the fan-shaped baffles are evenly distributed on the outer circular wall of the inner cylinder in the circumferential direction, and the thermal expansion mechanism can generate driving force enabling the fan-shaped baffles to rotate along with rising of the flue gas temperature; and the second shutter adjusting damper comprises a second reset mechanism and a plurality of air baffles rotationally connected into the inner barrel, and the opening degree of the air baffles can be automatically adjusted through the cooperation of the second reset mechanism according to the pressure difference of the two sides of the second shutter adjusting damper. The air and flue gas mixer is low in manufacturing, operation and maintenance cost, can autonomously realize efficient proportion adjustment of air and flue gas, and is favorable for ensuring low-nitrogen combustion and energy-saving effects of a boiler.

Description

technical field [0001] The invention belongs to the technical field of flue gas mixing devices, and in particular relates to an air and flue gas mixer. Background technique [0002] In order to meet the needs of low-nitrogen combustion and energy saving in industrial boilers, in recent years, flue gas recirculation technology that introduces high-temperature flue gas into the air duct of the boiler blower through the recirculation flue has appeared on the market. However, the existing flue gas recirculation technology Among them, the adjustment of air and flue gas needs to be adjusted by an external power mechanism. The structure is complex, the cost of manufacturing and operation and maintenance is high, and there is a large hysteresis, which will easily lead to fluctuations in the operating conditions of the furnace, affecting low-nitrogen combustion and Therefore, how to independently realize the high-efficiency ratio adjustment of air and flue gas according to the oxygen...

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Problems solved by technology

[0002] In order to meet the needs of low-nitrogen combustion and energy saving in industrial boilers, in recent years, flue gas recirculation technology that introduces high-temperature flue gas into the air duct of the boiler blower through the recirculation flue has appeared on the market. However, the existing flue gas recirculation technology Among them, the adjustment of air and flue gas needs to be adjusted by an external power mechanism. The structure is complex, the cost of manufacturing and operation and maintenance is high, and there is a large hysteresis, which will easily lead to fluctuations in the operating conditions of the furnace, affecting low-nitrogen combustion and Therefore, how to independently realize the high-efficiency ratio adjustment of air and flue gas according to the oxygen demand of combustion in the furnace under the premise of no external power has become a technical problem to be overcome urgently by those skilled in the art.

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