Multi-objective multi-constraint combustion optimization method of industrial gas boiler

Abstract

The invention discloses a multi-objective multi-constraint combustion optimization method of an industrial gas boiler. The method comprises steps as follows: S100: adjustable parameters of the gas boiler during running and characteristic indexes representing combustion states are collected as basic data; S200: a mathematical model for combustion of the gas boiler is established; S300: objective functions and constraint conditions are determined; S400: the best combinations of the adjustable parameters under various loads are searched through a genetic algorithm according to the established mathematical model, the objective functions and the constraint conditions. The matching degree of the low-nitrogen technology of the boiler is increased, and efficient, energy-saving and low-pollution running of the gas boiler is realized.

Description

technical field [0001] The invention relates to a boiler, in particular to a multi-objective and multi-constraint combustion optimization method for an industrial gas boiler. Background technique [0002] Fuel staging and flue gas recirculation are common methods for NOx combustion control in gas-fired boilers. At present, the determination of operating parameters such as primary and secondary fuel ratio, flue gas circulation volume and excess air coefficient is still manual debugging, which is time-consuming and labor-intensive. It is usually difficult to find the best operating conditions and cannot achieve multi-objective optimization. The current methods involving multi-objective combustion optimization are limited to the two optimization objectives of boiler efficiency and NOx emission, most of which are suitable for coal-fired boilers, and there are few combustion optimization methods for gas-fired boilers. As far as the domestic situation is concerned, the low-nitrog...

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Problems solved by technology

As far as the domestic situation is concerned, the low-nitrogen technology adopted by gas-fired boilers is mostly realized through low-nitrogen transformation. The burner is replaced on the original boiler or the flue gas recirculation is added, and the furnace is not modified. The matching of the flame shape and the size of the furnace is very important. If If the flame is too long, the flame will directly scour the heating surface, resulting in the rapid cooling of unburned carbon or gas and carbon deposits on the heating surface; if the flame is too short, there will be poor flame fullness, which will affect the effective use of the heating surface

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