Perforated strainer type heat transfer element for air pre-heater

Abstract

The invention belongs to the technical field of boiler air pre-heaters and exhaust gas heaters and discloses a perforated strainer type heat transfer element for an air pre-heater. According to the technical scheme, the perforated strainer type heat transfer element for the air pre-heater is composed of a plurality of overlaid heat exchange units, wherein each heat exchange unit is composed of a plurality of strip-shaped metal heat exchange members fixed between two borders in parallel, the heat exchange members constituting the heat exchange units overlaid up and down are arranged in a staggered mode, and the section of each heat exchange member is of a solid or tubular oval or round structure. According to the heat transfer element for the air pre-heater, no dead space exists for exhaust gas and air circulation, so that the anti-blocking capacity of the heat transfer element is improved effectively, the soot blowing frequency is reduced, moreover, the heat exchange area of the heat transfer element is increased, and the heat exchange efficiency of the heat transfer element is improved. In addition, due to the fact that rib textures reinforcing heat exchange are arranged on the surfaces of the heat exchange members, the strength of the element can be enhanced, the anti-crazing and anti-deforming capacity of the element is improved, and the service life of the element is prolonged.

Description

technical field [0001] The invention belongs to the technical field of boiler air preheaters and flue gas heaters, and relates to a grate-type air preheater heat transfer element used in the smoke exhaust process of thermal power plants. Background technique [0002] The air preheater is an essential equipment for thermal power plants to recover waste heat. Among them, the rotary air preheater is the main selection for large power plants. The heat transfer element is the core component of the rotary air preheater for heat exchange. The structure that constitutes the heat transfer element of the rotary air preheater is as follows: figure 1 and figure 2 As shown, it is composed of a component box assembled by superimposing a corrugated plate 1 and a support plate 2 that are used to increase the heat exchange area and press 0.6-12mm thick steel plates into various waveforms. The high-temperature flue gas sent from the flue enters in the direction of arrow F1 to heat the he...

AI Technical Summary

Problems solved by technology

The heat transfer element of this structure has the following defects during use: First, no matter how the corrugated shape of the corrugated plate constituting the heat transfer element is designed, a sharp dead angle 3 will be formed at the corrugated connection between the corrugated plate 1 and the support plate 2

From the perspective of fluid mechanics, the flue gas in these dead corners circulates slowly or has no circulation, which directly affects the heat exchange efficiency. The heat exchange element collapsed and damaged

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