Three-dimensional variable-space variable-structure flue gas reheater

Abstract

The invention discloses a three-dimensional variable-space variable-structure flue gas reheater. The three-dimensional variable-space variable-structure flue gas reheater comprises a flue gas channel composed of an inlet flue, a sealing plate and an outlet flue. The flue gas channel is provided with low-temperature heat exchange tubes and high-temperature heat exchange tubes in sequence in the flowing direction of flue gas, and the low-temperature heat exchange tubes are three-dimensional deformation HP tubes which are formed by spirally twisting elliptical tubes. The three-dimensional deformation HP tubes are adopted, the tube pass section is changed from round to flat, an abrasion point at a 60-degree angle is destroyed, the tube pass sectional area can be reduced by 40%-60% compared with that of a round plain tube, a stable flowing space of the shell pass outside the tubes is obtained, and the fluid resistance is reduced; the interior of each HP tube is of a special spiral structure, so that secondary flow of fluid is generated perpendicular to a main flow direction, the thermal boundary layer is destroyed, and the heat exchange efficiency is improved by 20%-40%; and the HP tubes are arranged in a special staggered arrangement mode, self-supporting is formed among tube bundles, the structure is quite compact, and the size of the flue gas reheater is 40%-50% smaller than that of a conventional reheater.

Description

technical field [0001] The invention relates to the technical field of flue gas reheaters, in particular to a flue gas reheater with three-dimensional variable space and variable structure. Background technique [0002] In my country, in order to improve the diffusion capacity of pollutants in the flue gas at the chimney outlet and reduce the visibility of the plume, the environmental protection department usually requires a flue gas reheater to be installed after flue gas desulfurization to heat the flue gas at the outlet of the desulfurization absorption tower to 80°C Left and right to increase the height of flue gas lift and reduce air pollution. If the flue gas temperature is kept high in the chimney, it can not only effectively reduce the formation probability of haze pollution in the atmosphere, but also reduce the low-temperature corrosion of the metal parts in the chimney by the flue gas. [0003] The flue gas reheater can be divided into a low-temperature section an...

AI Technical Summary

Problems solved by technology

The heat exchange tubes in the low-temperature section of the traditional flue gas reheater use bare tubes, and the bare-pipe flue gas reheaters have disadvantages such as easy wear, large flow resistance, and low heat transfer efficiency, which limit the application of flue gas reheaters

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