Micro-eccentric swinging type flue gas spoiler device and method for enhancing flue gas heat exchange

Abstract

The invention provides a micro-eccentric swinging type flue gas spoiler device and a method for enhancing flue gas heat exchange, and belongs to the field of industrial boilers and flue gas / water heatexchangers. The spoiler device comprises a spoiler (200) that is arranged in a micro-eccentric manner to rotate along a positioning shaft, and the positioning shaft fixing the spoiler (200) in a smoke tube (300); the rotating spoiler (200) disturbs the smoke in the smoke tube (300) so as to reduce the thermal resistance of the boundary layer of the inner wall of the smoke tube (300) and / or to cause local turbulence in the smoke tube (300). The spoiler device provided the invention has simple manufacturing process, can reduce the steel consumption, improve the efficiency of the boiler and theflue gas / water heat exchanger, and is especially suitable for the enhanced heat transfer of the large diameter smoke tube.

Description

technical field [0001] The invention belongs to the technical field of industrial boilers and flue gas / water heat exchangers, and in particular relates to a slightly eccentric swing type flue gas turbulence device and a method for enhancing flue gas heat exchange. Background technique [0002] In the smoke pipe flue gas / water heat exchange device, the heat exchange on the flue gas side has a relatively large thermal resistance, so the main measures to improve the efficiency of this type of heat exchange device are to reduce the heat exchange thermal resistance on the flue gas side and strengthen the Heat exchange on the gas side. For the traditional smoke tube heat exchange device, the existing common practice is to use the threaded smoke tube to achieve the disturbance of the flue gas, so as to achieve the purpose of enhancing heat transfer. Among them, the threaded smoke pipe has weak strengthening ability because it can only destroy and disturb the surrounding flue gas, ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the heat transfer efficiency of the flue pipe (flue gas pipe) is reduced due to the high thermal resistance in the prior art, the heat transfer efficiency is limited by the flow rate of the flue gas, and the existing measures to improve the heat transfer efficiency cannot be applied to large-diameter flue pipes. Problem, the inventor has carried out intensive research and designed a slightly eccentric swinging flue gas turbulence device, which includes a positioning shaft inside the pipe and a slightly eccentric spoiler that can rotate along the shaft , the spoiler can deflect and swing with the flow direction of the flue gas. The flue gas flow is disturbed by the spoiler and generates local turbulence. By flapping the flue gas, the high-temperature flue gas in the center of the pipe hits the inner wall of the pipe to strengthen the disturbance of the flue gas and reduce the The thermal resistance of the boundary layer improves the heat transfer efficiency; at the same time, due to the eccentric setting of the spoiler, it will swing left and right under the impact of high-speed flue gas and airflow in the turbulent area, making it difficult for soot to accumulate, so it has better self-cleaning ability. By changing the size and weight of the spoiler, the spoiler in the present invention is suitable for smoke pipes of any diameter, especially for the enhanced heat transfer of large-diameter smoke pipes, thereby completing the present invention

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