INCREASING OF REABILITY OF WORK OF BOILERS BY EQUAL DISTRIBUTION OF THE HEAT LOAD OVER THE HEIGHT OF FIREBOX

Abstract

Detection of one of the methods for reducing the emergency screens of boiler units pipes is in the process of being discovered. Specially used in the even distribution of heat load in the active combustion zone, replacing the burners with 1-2 tier arrangement by 2-4 tier, reducing the single power of the finger. Investigation of the supported solution, with the posture of the boiler. The mathematical calculation model and graphical division of the boiler furnace into combustion zones are presented. The results of the research showed that a large number of burners and a decrease in the unit power of the population, which reaches a greater uniform thermal voltage, are detected by the height of the shielded pipe, reducing peak maximum consumption from 100% to 86.5% (590 kW / m2 to 510 kW / m2) As the number of burners increases, the thermal load in the lower part of the combustion zone increases, which results in more intense boiling, as a consequence of the increase in the velocity of the vapor-liquid mixture in the screen tubes and, accordingly, the cooling of the evaporator tubes in the regions of the highest heat load. The temperature of the screen metal in the zones of maximum heat load of the pipes is reduced by 20-30 0C, which, with a long service life, leads to a decrease in temperature aging, and consequently an extension of the inter-repair life of the boiler. The disadvantage of this method is the complication and complication of the manufacture of screen pipes, increase the hydraulic resistance of the lifting pipes by increasing the number of bends of pipes, complicates the system of supply of fuel and air. The results of the calculations are presented in graphical form, as the dependence of the specific heat load, the temperature of the outer wall of the pipe, the allowable thermal stress, the height of the pipe at one-, two- and four-tier arrangement of burners in the zone of active combustion.