Parameter optimization ultra-supercritical secondary reheating power station boiler

Abstract

The invention claims a parameter optimization ultra-supercritical secondary reheating power station boiler and relates to an ultra-supercritical secondary reheating power station boiler which is efficient, safe and low in emission and low in cost and is matched with a parameter optimization ultra-supercritical secondary reheating turboset for a fire coal thermal power station. The main steam inlet parameter optimization at the boiler side is 35.7MPa at 590 DEG C; the primary reheating steam parameter optimization is 8.9MPa at 623 DEG C; the secondary reheating steam parameter optimization is 1.52MPa at 538 DEG C; the water giving temperature optimization is 303 DEG C; a tail smoke channel is divided into a front smoke channel, a middle smoke channel and a rear smoke channel through division walls; the ejector heat primary air damper is arranged in the boiler and is started at low load; the opening degree of the ejector heat primary air damper is controlled and the using number is controlled for maintaining the primary reheating temperature at rated value in the range of 40% to 100% BMCR; the adding times and the using number of the temperature adjusting wind-smoke ejector along the furnace width direction are changed for compensating and reducing heat deviation along the furnace width direction for the heating surface.

Description

(1) Technical field:

[0001] The invention relates to a parameter-optimized ultra-supercritical double-reheat power plant boiler, which relates to a high-efficiency, safe, low-emission, and low-cost coal-fired thermal power plant that is matched with a parameter-optimized ultra-supercritical double-reheat steam turbine unit. Ultra supercritical double reheat power plant boiler. (two) background technology:

[0002] The double-reheat power plant boiler used in the prior art thermal power plant is used to supply steam to the double-reheat turbo-generator set, and the design of the typical boiler-side main steam temperature / primary reheat steam temperature / secondary reheat steam temperature The value is 605°C / 623°C / 623°C, which has reached the use limit of mature heat-resistant austenitic stainless steel materials in the existing technology. For the high-temperature superheater outlet header made of P92, the temperature safety margin of some nozzles is already insufficient . ...

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