Boiler water cooling wall heat transfer enhancement tube with spoilers

Abstract

The invention discloses a boiler water cooling wall heat transfer enhancement tube with spoilers. The boiler water cooling wall heat transfer enhancement tube with the spoilers comprises a tube body, the spoilers arranged along the axial direction of the tube body and an inner fin arranged in spiral mode along the axial direction of the tube body, wherein each spoiler is formed by twisting a stainless steel sheet, the twisting angle of each stainless steel sheet is 90 degrees, the windward sides of the spoilers are welded on the inner wall of the tube body, the spoilers are arranged at intervals from 1000mm to 1300mm along the axial direction in the tube body, the section of the inner fin is in non-isosceles trapezoid shape, the lower bottom face of the inner fin is smoothly connected with the inner wall surface of the tube body, an included angle Alpha between the side face of the inner fin and the lower bottom face of the inner fin is 60-70 degrees, and the other included angle Beta between the side face of the inner fin and the lower bottom face of the inner fin is 20-30 degrees. The boiler water cooling wall heat transfer enhancement tube with the spoilers adopts a cooperation mode of the spoilers and the inner fin with the section in non-isosceles trapezoid shape, improves heat transfer efficiency between near wall fluid and mainstream fluid, reduces occurrence rate of rotational flow of the fluid on the leeward side of the inner fin, thereby reducing local temperature, improving heat transfer performance of an inner spiral tube overall, and ensuring safe operation of a boiler water cooling wall.

Description

technical field [0001] The invention relates to the field of enhanced heat transfer of boiler water-cooled wall tubes, in particular to a boiler water-cooled wall enhanced heat transfer tube with spoilers. Background technique [0002] Primary energy is dominated by coal and mostly low-quality coal, of which the amount of coal consumed for power generation accounts for a huge proportion of the total coal. Compared with traditional thermal power technology, ultra-supercritical circulating fluidized bed combustion technology has many advantages such as high efficiency, strong adaptability to coal types, and less pollutant emissions, so it is widely used. In order to ensure the stability and safety of the operation of the ultra-supercritical circulating fluidized bed, it is recommended to use internally threaded pipes for the water wall to delay the occurrence of film boiling, so as to avoid dangerous accidents such as pipe bursts to the greatest extent. [0003] However, the ...

AI Technical Summary

Problems solved by technology

This patent strengthens the heat transfer of the internally threaded tube and reduces the flow resistance to a certain extent, but it also does not improve the problem of the high local temperature of the internally threaded tube and the heat transfer efficiency of the fluid near the wall and the mainstream fluid.

Images