Boiler combustion optimization method and system based on AGC mode and adjustment system

Abstract

The invention discloses a boiler combustion optimization method and system based on an AGC mode and an adjustment system, and relates to the field of thermal power plant combustion control. According to the method, related parameters of a boiler are adjusted according to multiple influence factors in combination with an AGC instruction issued by a power grid until boiler combustion is kept at a rated load within a first preset range, and the multiple influence factors, obtained according to the combustion degree of a hearth, of the stable combustion capacity in the deep peak regulation period are comprehensively utilized; the air leakage rate of a hearth is controlled, the drying output of a coal pulverizing system is improved, secondary air distribution adjustment, plasma combustion supporting, the operation mode optimization of the coal pulverizing system and the like are achieved, the minimum technical output of a boiler is reduced to 15% of design output, the deep peak regulation capacity range of a unit is effectively expanded, and the stability, safety and economical efficiency of unit operation are guaranteed.

Description

technical field [0001] The invention relates to the field of combustion control in thermal power plants, in particular to a boiler combustion optimization method, system and adjustment system based on an AGC mode. Background technique [0002] At present, my country's coal-fired power generation units still account for a large proportion of the electricity market. Taking Beijing, Tianjin and Tangshan as an example, the installed capacity of coal-fired power generation accounts for 55% of the total installed capacity, while new energy power generation has seasonality and randomness. Due to its own characteristics, coal-fired power units cannot perform rapid start-stop peak regulation. With the continuous advancement of the country's new round of power system reform, the rapid liberalization of electricity market-oriented transactions, and the vigorous development of clean energy, the peak-to-valley difference in the power grid has increased year by year. In order to absorb c...

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Problems solved by technology

[0003] Deep peak shaving in thermal power plants faces a series of problems such as poor combustion stability of the boiler under low load, low temperature of the denitrification ammonia injection system and cannot be put into normal operation, and the operating parameters of the boiler deviate greatly from the design parameters during the deep peak shaving period, which affects the stability of the unit operation, Safety and economy put forward stricter requirements

[0004] The current mainstream deep peak shaving method is based on the use of the boiler itself, reducing the load of the unit to the design minimum technical output. Generally, the deep peak shaving is 30-40% of the design output, that is, it cannot meet the stable combustion requirements of the boiler without oil input.

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