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 . ...

AI Technical Summary

Problems solved by technology

When the inlet of the furnace smoke recirculation fan is connected to the outlet of the economizer, high dust, high working temperature, low flue gas density, and high speed will reduce the reliability of the furnace smoke recirculation fan, MTBF (Mean Time Between Failures) decrease and power consumption increases; when the inlet of the furnace smoke recirculation fan is connected to the outlet of the dust collector, the flow rate on the smoke side of the air preheater increases by 10% to 20%, which will cause a significant increase in the exhaust gas temperature of the boiler and a decrease in boiler efficiency , the furnace smoke recirculation fan needs a higher pressure head, and the power consumption is huge; when the inlet of the furnace smoke recirculation fan is connected to the outlet of the induced draft fan, similarly, the flow rate on the smoke side of the air preheater will increase by 10% to 20%, causing boiler smoke exhaust The temperature increases significantly, the efficiency of the boiler decreases, and the power consumption of the induced draft fan increases by 10% to 20%

[0006] In order to make the outlet temperature of the secondary reheat steam reach the design value under the working condition of 50%-65% BMCR, the existing technology also adopts a temperature adjustment scheme with three flues and three baffles at the tail, but this scheme has relatively high requirements The outlet temperature of the furnace is not suitable for the bituminous coal that is easy to slagging

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