Media Flow And Heat Transfer Characteristics In Radiation Chamber Tubes Of Tube-Furnace

The energy crisis is becoming increasingly serious, requiring all companies to take varies of energy saving measures. In refinery distillation unit, the furnace is major energy-consuming equipment, accounted for80%-83%of total energy consumption of the device, so reducing furnace fuel consumption and increase furnace thermal efficiency is the key to achieve "low-power, high efficiency"For energy conservation and parameters change of media flowing, this paper from theoretical analysis, simulation results analysis to discuss, and main content is as following:This paper first introduces the overview of the development of the furnace, establishes radiation heat transfer model to calculate the flue gas temperature and the radiation chamber heat load,and then uses refinery process business computing software simulation of the vertical furnace and cylindrical furnace. According to the result analyzes the change of medium temperature, pressure, flow speed, the relative coking rate and steam mass fraction in radiation chamber tubes of furnace and the change of wall temperature of furnace. Simulation the vertical furnace which is injected water vapor at the entrance of tube of radiation chamber. According to results to analyze the change of media parameters after injecting water vapor, and compares with the media parameters of furnace which does not inject water vapor on relative coking rate, flow speed and steam mass fraction, finally concludes that the injected water vapor can increase fluid velocity increase, reduce coking rate and lower vaporization temperature.This paper analyzes the influencing factors of furnace thermal efficiency. For the measure of waste heat recovery, introduces several common air preheater, and determine appropriate air preheater for two furnace in this paper. Using FIHR software simulates the vertical furnace and cylindrical furnace by changing excess air ratio and air into the furnace temperature, concludes that reduce the excess air ratio and improve air into the furnace temperature can improve furnace thermal efficiency.