Jet flue gas recycling method for preventing spray opening burning loss of secondary reheating boiler

Abstract

The invention provides a jet flue gas recycling method for preventing spray opening burning loss of a secondary reheating boiler and relates to a method for adjusting main steam temperature, primary reheating steam temperature and secondary reheating steam temperature of a secondary reheating power plant boiler capable of being used by a thermal power plant safely and economically for a long time. According to the method, a temperature-regulating flue wind spraying nozzle set, a temperature-regulating flue wind connection box, a temperature-regulating flue wind duct, a temperature-regulating wind-flue ejector, an ejector flue gas suction side closing baffle, an ejector heat primary wind adjusting baffle, a heat primary air duct, a multi-hole switch type throttling baffle and a DCS control system are included. By means of the method, the problems that in the prior art, a temperature-regulating system of the secondary reheating power plant boiler does not use a furnace flue recycling fan, and it is difficult for the temperature of a secondary reheating steam outlet to reach the design value under the work condition of 50%-65% BMCR are solved, the distribution uniformity of primary air for cooling in all temperature-regulating flue wind spray nozzles is remarkably improved, and it is guaranteed that the jet flue gas recycling system can operate safely and economically for a long time.

Description

(1) Technical field: [0001] The jet flue gas recirculation method for preventing nozzle burnout of a secondary reheating boiler of the present invention relates to a thermal power station that can be used in a thermal power station in a long-term, safe and economical manner. Adjustment method of reheat steam temperature. (two) background technology: [0002] The double-reheat power plant boilers used in thermal power plants in the prior art are used to supply steam to the double-reheat turbo-generator sets, and the typical boiler-side main steam temperature / primary reheat steam temperature / secondary reheat steam temperature The design value is 605°C / 623°C / 623°C. [0003] A typical double-reheat turbogenerator is equipped with a four-stage high-pressure heater and a separate steam cooler, and the boiler feed water temperature is as high as 330°C; the inlet temperature of the primary reheater and the inlet temperature of the secondary reheater are generally at 420~440℃. [...

AI Technical Summary

Problems solved by technology

When the inlet of the fume recirculation fan is connected to the outlet of the economizer, high dust, high working temperature, low flue gas density, and high rotation speed will reduce the reliability of the fume recirculation fan and increase the power consumption ; When the inlet of the furnace smoke recirculation fan is connected to the outlet of the dust collector, the flow rate of 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 significant decrease in boiler efficiency

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