Method for determining burnout height of combustion chamber of pulverized coal boiler

Abstract

The invention provides a method for determining the burnout height of a combustion chamber of a pulverized coal boiler. The method comprises the steps as follows: Step 1: a high-altitude environment is simulated, and combustion characteristic parameters of fire coal in the high-altitude state are acquired through a combustion test of the fire coal on a test bed; Step 2: according to the characteristic parameters, the correlation between the carbon content of coal-fired fly ash of the fire coal and the dwell time of pulverized coal of the fire coal in the boiler is obtained; Step 3: according to the correlation between the carbon content of the fly ash and the dwell time of the pulverized coal in the boiler, the dwell time value, corresponding to the limit value, required to be reached during actual boiler design, of the carbon content of the fly ash, of the pulverized coal in the boiler is obtained, and the burnout height of the combustion chamber is obtained in combination with the flue gas velocity of the pulverized coal in the combustion chamber. With the method for determining the burnout height, the boiler design in a high-altitude area has more scientific bases, the problems of high carbon content of the fly ash and low boiler combustion efficiency due to insufficient burnout time which is possibly caused by the fact that the burnout height of a boiler in the high-altitude area is determined as per the empirical formula only are solved, and the boiler design risk is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of pulverized coal boiler design, in particular to a method for determining the burnout height of a pulverized coal boiler furnace. Background technique [0002] Yuka coal is bituminous coal with high ash content, high volatile content and medium calorific value. In the design of unconventional boilers (plateau areas with an altitude > 700m), according to the requirements of the "Guidelines for Furnace Selection of Large-capacity Pulverized Coal-fired Boilers" (DL / T831-2002), the boilers that use this type of coal The burnout height h1 should be corrected according to the formula. [0003] For tangential combustion and wall combustion boilers, if the height h1 of the burnout area of ​​the furnace is used as one of the characteristic parameters of the furnace type selection contour, the value of the burnout height h of the boiler in the plateau area should be corrected according to the following formula: ...

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a method for determining the burnout height of pulverized coal boilers in high altitude areas, so as to solve the problem of unreasonable design of burnout heights for boilers in plateau areas

Images