Determination method and system for demanded quantity of boiler fuel and adjustment method and system for boiler fuel

Abstract

The invention discloses a determination method and system for the demanded quantity of boiler fuel and an adjustment method and system for the boiler fuel. The determination method comprises the following steps that the steam generating rate of a boiler in a combustion stabilization state is obtained so as to obtain a historical value of the steam generating rate; the steam generating rate of the fuel is predicted by utilizing the historical value of the steam generating rate so as to obtain the predicted value of the steam generating rate; and the demanded quantity of the fuel is calculated by utilizing the predicted value of the steam generating rate and the current load capacity of the boiler. According to the determination method and system for the demanded quantity of the boiler fuel and the adjustment method and system for the boiler fuel, in the combustion process of the boiler, when the fuel value changes due to various factors, the change can be embodied by the change of the steam generating rate, and therefore the demanded quantity of the fuel which is finally calculated through the historical value, obtained in a rolling mode, of the steam generating rate is accurate; and in addition, the situation that the fuel value changes greatly can be adapted to according to the adjustment range determined by the demanded quantity of the fuel and the adjustment limit amplitude of the fuel, the problem of under-adjustment or over-adjustment can be avoided, meanwhile, a tedious process of obtaining the fuel value by chemical analysis can also be avoided, and the correction response speed can be increased.

Description

technical field [0001] The invention relates to the field of feedback adjustment, in particular to a method for determining boiler fuel demand, an adjustment method and a system. Background technique [0002] During the combustion process of the boiler, due to various factors, the calorific value of the boiler fuel will change. When the calorific value of the fuel changes, in order to keep the utilization rate of the fuel within a reasonable range, it is necessary to adjust the amount of fuel newly introduced into the furnace. [0003] In the prior art, there are two ways to correct the fuel quantity. One is to approximate the calorific value of the fuel to a fixed value and adjust it through a feedback control loop (PID). The parameters of the amount of fuel entering the furnace are determined by the value of the combustion output, that is, the evaporation amount at the boiler outlet. But when the calorific value of the fuel changes, the preset fixed calorific value is n...

AI Technical Summary

Problems solved by technology

The calorific value of fuel entered manually comes from chemical analysis, but the analysis cycle of chemical analysis is eight hours or one day, the in

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