Structure for ultra-supercritical fin low-temperature reheater

Abstract

The invention relates to a structure for an ultra-supercritical fin low-temperature reheater so as to solve the problems that the heating surface of an existing low-temperature reheater is large in arrangement space and a heating plate of the reheater subjected to abrasion is inconveniently replaced. The structure provided by the invention comprises a low-temperature reheater reheating tube, a first group of low-temperature reheating sheets and a second group of low-temperature reheating sheets, wherein the first and second groups of low-temperature reheating sheets are formed by arranging cuboid fins at equal intervals and are welded on the low-temperature reheater heating tube through a heat transfer base; and the first and second groups of low-temperature reheating sheets are alternately arranged on the left and right sides of the low-temperature reheater reheating tube. According to the structure provided by the invention, the rear smoke channel space of a boiler is effectively utilized, so that the heating surface of the reheater is increased to the maximum extent.

Description

technical field [0001] The invention relates to a structure for a super(super)critical finned low-temperature reheater. Background technique [0002] At present, the reheater outlet temperature of many large-scale 660MW ultra-supercritical power plants reaches 613°C, which is 10°C higher than that of conventional ultra-supercritical boilers. However, when the existing reheater outlet temperature reaches 613°C, the existing horizontal low-temperature reheater The heating surfaces are all in the form of bare tubes. This arrangement leads to a large space for the heating surface of the low-temperature reheater, which is not conducive to the utilization of the space in the flue area at the tail of the boiler, making it difficult for the steam temperature of the reheater to reach the design value, especially in the unit During low-load operation, the steam temperature of the reheater is slightly lower than the design value; at the same time, the existing low-temperature reheater ...

AI Technical Summary

Problems solved by technology

[0002] At present, the reheater outlet temperature of many large-scale 660MW ultra-supercritical power plants reaches 613°C, which is 10°C higher than that of conventional ultra-supercritical boilers. However, when the existing reheater outlet temperature reaches 613°C, the existing horizontal low-temperature reheater The heating surfaces are all in the form of bare tubes. This arrangement leads to a large space for the heating surface of the low-temperature reheater, which is not conducive to the utilization of the space in the flue area at the tail of the boiler, making it difficult for the steam temperature of the reheater to reach the design value, especially in the unit During low-load operation, the steam temperature of the reheater is slightly lower than the design value; at the same time, the existing low-temperature reheater tubes are damaged due to long-term use of the hot plate. It is connected by direct welding connection. If the hot plate is damaged, the entire heating surface of the reheater needs to be replaced, which causes a lot of waste.

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