Device for preventing oxide skin blockage of boiler superheater and reheater and regulation and control method thereof

Abstract

The invention discloses a device for preventing oxide skin blockage of a superheater and a reheater of a boiler and a regulation and control method of the device. A sectional type inlet header corresponds to a group of single-screen heat exchange tube bundles, the group of single-screen heat exchange tube bundles comprises a plurality of single-screen heat exchange tube bundles, and each single-screen heat exchange tube bundle comprises a heat exchange tube body; the heat exchange tube body comprises a heat exchange tube inlet end, a first heat exchange tube straight-flow section, a bent tube section, a second heat exchange tube straight-flow section and a heat exchange tube outlet end; the bent pipe section comprises a bent pipe inlet end, a bent pipe horizontal section and a bent pipe outlet end; outlets of the sectional type inlet headers are communicated with the outlet header sequentially through the corresponding heat exchange pipe inlet ends, the first heat exchange pipe direct flow sections, the bent pipe inlet ends, the bent pipe horizontal sections, the bent pipe outlet ends, the second heat exchange pipe direct flow sections and the heat exchange pipe outlet ends, and the adjacent sectional type inlet headers are communicated through a two-way pneumatic adjusting valve. The device and the regulation and control method thereof can realize dredging and recovery of the oxide skin in the boiler tube bundle of the generator set.

Description

technical field [0001] The invention belongs to the field of energy utilization, and relates to a device for preventing oxide scale clogging of boiler superheaters and reheaters and a control method thereof. Background technique [0002] The heat transfer deterioration caused by the peeling and deposition of oxide scale on the high-temperature heating surfaces such as superheaters and reheaters in thermal power units, which leads to over-temperature tube burst, shutdown and other accidents of the unit is one of the major hidden dangers that threaten the safe and stable operation of the unit. cause huge economic losses. This problem faced by boilers in supercritical and ultra-supercritical units is even more severe. The improvement of the initial parameters of the boiler can improve the power generation efficiency of the unit, but at the same time, it will accelerate the formation of oxide scale. Since the thermal expansion coefficient of the oxide scale is quite different f...

AI Technical Summary

Problems solved by technology

Due to the large number of heat exchange tube bundles in the boiler, the cleaning workload is huge and time-consuming and inefficient, so far there is still no good solution

Although upgrading the material grade of superheater and reheater heat exchange tubes can alleviate the formation and clogging of scale particles, the production cost is too high

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