Automatic regulating system for combustion process of circulating fluid bed in boiler

Abstract

An automatic regulation system for the combustion of circulating fluidized-bed boiler (CFBB) features that it has several regulation loops for the discharged cinder quantity, primary blowing rate, supplied coal quantity, secondary blowing rate and draught air volume, which are based on the coordination between fluidizing, combustion and heat exchange, the expert system, fuzzy control and composite cascaded PI regulation are combined, and the protecting tactics such as override protection, output restriction and lock distribution choosing and tracking are used.

Description

technical field [0001] The invention relates to an automatic adjustment system for the industrial process of solid fuel and air reaction combustion, especially an automatic adjustment system for circulating fluidized bed boiler combustion. Background technique [0002] Circulating fluidized bed boiler (CFBB) combustion technology is a coal-fired technology developed in the past 20 years. It has outstanding advantages such as wide fuel adaptability, high combustion efficiency, environmental protection (low nitrogen oxide emission, desulfurization), large load regulation ratio and fast load regulation. [0003] Generally, circulating fluidized bed boilers include wind panels, furnaces, separators, feeding devices, coal feeders, superheaters, water walls, induced draft fans, primary fans, secondary fans, high-pressure fan drums and other components, of which the furnace has Coal feed inlet, limestone feed inlet, primary air inlet, secondary air inlet, slag discharge outlet, ma...

AI Technical Summary

Problems solved by technology

It is difficult to establish mathematical models and transfer functions at the current level of technology

[0006] Traditional circulating fluidized bed boiler combustion control strategy adopts one-sided method such as one adjustment parameter controls one adjusted parameter or two adjustment parameters controls one adjusted parameter, etc. to adjust the bed temperature", so that the automatic adjustment can only operate in a localized and stable environment

If the external disturbance such as load or coal type or equipment changes, and the internal disturbance such as important operating parameters changes greatly, the stability, rapidity and accuracy cannot meet the actual requirements of on-site operation, resulting in long-term, stable, safe and economical automatic adjustment. put in

At the same time, the loop of the original regulation system is also relatively disordered, resulting in deviations in the starting point and focus of the analysis problem

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