Combustion system suitable for flexible peak regulation of four-corner tangential boiler, and operation method thereof

Abstract

The invention discloses a combustion system suitable for flexible peak regulation of a four-corner tangential boiler, and an operation method thereof. According to the system, a layer of swirling pulverized coal burner is compactly arranged between two layers of direct-current pulverized coal burners, and air-powder mixtures of the swirling burner are from an independent air-powder conveying system; Coal for combustion of the swirling burner is high-quality coal with high volatile components and heat values, and primary air and secondary air of the swirling burner are both swirl flow; and theswirl strength can be adjusted by 0-100% through a pull rod. When the boiler needs to be subjected to deep peak regulation, the turbulent burner and the adjacent direct-current pulverized coal burnerare put into operation; When the boiler operates at medium and high loads, the swirling burner is stopped, and only secondary air is introduced to participate in boiler combustion; and the situation that the boiler nozzle is coked or burnt out at medium and high loads is avoided. According to the combustion system and the operating method thereof, the deep peak regulation capacity of the coal-fired boiler can be effectively improved, and the consumption capacity of a power grid for new energy power generation is improved.

Description

technical field [0001] The invention belongs to the technical field of deep peak regulation of coal-fired power plant boilers, and in particular relates to a combustion system and an operation method suitable for flexible peak regulation of four-corner tangential boilers. Background technique [0002] With the rapid development of renewable energy such as wind power and photovoltaic power generation in China, and the increasing peak-to-valley difference in demand for power users, the safety and stability of the power grid is affected by the strong randomness and volatility of wind power and photovoltaic power generation. In addition to the impact, the phenomenon of abandoning light and wind occurs from time to time. In order to improve the consumption of renewable energy and ensure the safe and stable operation of the power grid, the coal-fired generating units that account for more than 70% of the country's total power generation need to improve their deep peak-shaving capa...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a flexible peak-shaving method suitable for four-corner tangentially round boilers in view of the characteristics of poor low-load stable combustion capability and high risk of boiler fire extinguishing that are prone to occur in the deep peak-shaving process of the existing four-corner tangentially round coal-fired boilers. Combustion system and method of operation thereof

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