Boiler stable combustion control method for deep peak regulation working condition of coal-fired unit

Abstract

The invention discloses a boiler stable combustion control method for a deep peak regulation working condition of a coal-fired unit. The boiler stable combustion control method comprises the following steps that the coal supply quantity entering a boiler hearth is controlled through a coal feeder frequency converter instruction (1), the primary air quantity required for conveying pulverized coal is controlled through a coal grinding mill hot air door baffle instruction (2), the secondary air quantity entering the boiler hearth is controlled through an air feeder moving blade instruction (3), and after the unit enters the deep peak regulation working condition, an emergency steady-combustion coal quantity operation loop (4) is additionally arranged in front of a coal feeder instruction operation loop (7) for controlling the coal feeding quantity entering the boiler hearth; and an emergency steady-combustion air volume calculation loop (50) is added in front of a air feeder moving blade instruction calculation loop (12). Through an arranged judgment threshold device, the sensitivity of entering the deep peak regulation working condition is improved, the combustion working condition of a boiler can be rapidly adjusted through reasonable cooperative processing distribution, the combustion stability of the boiler in the critical state is improved, the fire extinguishing risk of the boiler is avoided, and long-term safe and stable operation of the unit is maintained.

Description

technical field [0001] The invention relates to a boiler stable combustion control method for deep peak-shaving working conditions of a coal-fired unit. Background technique [0002] In recent years, new energy sources such as wind power and photovoltaics have developed rapidly in China, and large-scale UHV DC transmission projects have been put into operation. The proportion of conventional thermal power generation units in the power supply structure has decreased, and the power generation load rate has shown a downward trend year by year. Peaking has become the new normal. At the same time, with the official operation of the power auxiliary service market, participating in the bidding service for deep peaking has become a new profit point for power generation companies. [0003] Under deep peak shaving, the operating characteristics of the unit are more complicated, the boiler combustion is closer to the critical stable point, and there is a risk of fire extinguishing in t...

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Problems solved by technology

[0003] Under deep peak shaving, the operating characteristics of the unit are more complicated, the boiler combustion is closer to the critical stable point, and there is a risk of fire extinguishing in the boiler. In the process of coordinated control and load reduction, the overshoot of coal combustion will cause greater pressure on the combustion stability of the boiler. Therefore, There is an urgent need to study a control method for boiler stable combustion to ensure that the unit can maintain long-term safe and stable operation of the unit during the period of participating in the deep peak shaving auxiliary service, and strive for greater power generation profits for the unit operation

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