Boiler water-cooled wall inner threaded pipe with streamline-section inner ribs

Abstract

The invention discloses a boiler water-cooled wall inner threaded pipe with stream-line-section inner ribs. The boiler water-cooled wall inner threaded pipe comprises a pipe body and the ribs spirally arranged on the inner wall of the pipe body in the axial direction, wherein the cross sections of the ribs are in streamline shapes. The ribs which are spirally arranged are distributed at equal intervals, and the number of the ribs is 4 to 8. The included angle between the spiral direction of the ribs and a cross section is controlled within the range of 30 degrees to 60 degrees. The circumferential bottom width of the ribs of the boiler water-cooled wall inner threaded pipe is controlled within the range of 4 mm to 10 mm. The height of the highest point of the ribs of the boiler water-cooled wall inner threaded pipe is controlled within the range of 0.5 mm to 1.5 mm. The position of the highest point of the ribs is at the position of one third of the rib bottom width. By means of the novel boiler water-cooled wall inner threaded pipe, vortexes on the back flow sides of the ribs are avoided or reduced through the streamline inner ribs, so that the heat transfer capability of the inner wall face of the pipe is effectively improved, and the temperature level near rib roots on the back flow sides of the ribs is lowered. Therefore, the heat transfer performance of the boiler water-cooled wall inner threaded pipe can be further enhanced through the pipe shape.

Description

technical field [0001] The invention belongs to the technical field of enhanced heat exchange, and in particular relates to an inner threaded tube of a boiler water cooling wall with a streamlined section inner rib. Background technique [0002] With the vigorous development of the power industry, large capacity, high parameters, high efficiency, and low emissions have gradually become the mainstream of thermal power equipment development. The furnace water wall is the heating surface arranged around the boiler furnace and is one of the most important components in the boiler. The use of a certain form of internal threaded tubes in boiler water walls and other evaporative heating surfaces can still maintain nucleate boiling under the conditions of much lower mass flow rate and much higher steam dryness than bare tubes, and the internal thread structure can effectively suppress or delay film boiling. [0003] The cross-sectional shape of the fins of the traditional boiler w...

AI Technical Summary

Problems solved by technology

Along the flow direction of the working medium in the tube, there is a vortex area on the back flow side of the fins, which is not conducive to local heat transfer, resulting in an obvious temperature difference between the rib top and the rib root on the inner wall of the internal threaded tube, and even causes the back flow of the fins Local high temperature near the root of the side rib induces damage to the heat transfer tube and affects the safe use of the internal threaded tube

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