A Calculation Method of Circulating Fluidized Bed Boiler Performance Based on Calcium Balance

Abstract

The invention discloses a circulating fluidized bed boiler performance calculation method based on calcium balance. The method comprises the following steps of analyzing the content of the calcium element in coal as fired, limestone desulfurizing agent, fly ash and slag, based on the principle that the calcium element is conserved in the whole combustion and desulfurization reaction, the coefficient K for representing the desulfurizing agent and fuel is introduced, a calcium balance basic formula is put forward, then through a chemical equivalent relation and a grey balance formula of fuel inthe boiler and the desulfurization reaction, a correlative iterative computation procedure is built, through iterative calculation, the numerical value of the coefficient K is calculated, and the relative amount of the limestone desulfurizing agent which is put into the boiler to be reacted is determined. Through the analysis method, the situation that the mass and flow of the fuel and desulfurizing agent in the boiler are directly measured is avoided, the test uncertainty is lowered, on the basis of using a conventional method for testing the circulating fluidized bed boiler performance, theboiler thermal efficiency can be more accurately calculated, and the utilization rate of the desulfurizing agent is obtained; meanwhile, the desulfurizing recycling value of pulverized ash can be evaluated.

Description

technical field [0001] The invention belongs to the technical field of performance testing of circulating fluidized bed boilers, and in particular relates to a calculation method for the performance of circulating fluidized bed boilers based on calcium balance. Background technique [0002] As a clean coal combustion technology, circulating fluidized bed boiler has attracted extensive attention in recent years because it is good for burning low-quality coal and can add limestone to the furnace for synchronous desulfurization during combustion. With the gradual completion of digestion and absorption of imported foreign technology by major domestic boiler factories in the past ten years, dozens of circulating fluidized bed boilers of various capacities in the power industry have been put into operation one after another, including 135MW and 150MW ultra-high pressure CFB Various types of boilers, 300MW level subcritical CFB boilers, 350MW supercritical CFB boilers, 600MW level ...

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to provide a CFB boiler performance calculation method based on the calcium balance for the existing two CFB boiler performance test methods, and replace the desulfurizer and fuel by the laboratory analysis of the calcium element content of various related substances For the measurement of mass flow, the basic formula of calcium balance and iterative calculation method are used to determine the "decombustion ratio" coefficient K, which reduces the tedious measurement work and reduces the uncertainty of the test

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