关键词: 渣油加氢, 反应进料加热炉, 底烧式梯形加热炉, 盘管布置, 炉体钢结构, 密闭式炉膛看火门, 均速管式流量计

Abstract:

This article introduces the design case of the first application of the complete set of patented technology “bottom-burning trapezoidal heater” to the reaction feed heater of residue hydrogenation unit, and summarizes the design practice of this complete set of technology. The combination of trapezoidal heater body structure and wall attached combustion technology improves the uniformity of the temperature field and thermal intensity field of the flue gas in the upper and lower parts of the radiation chamber furnace, reduces the circumferential non-uniformity coefficient of the thermal intensity on the surface of the furnace tubes in the upper and lower parts of the radiation chamber, reduces the peak thermal intensity on the surface of the furnace tubes, improves the average surface thermal intensity of the furnace tubes, reduces the amount of high alloy furnace tubes used, and obtains a stable temperature rise gradient for the heated medium inside the furnace tubes, slowing down the trend of cracking and coking of the heated medium in the furnace tube. Through optimization and innovative design in four aspects, including coil layout scheme, heater automatic control, furnace steel structure calculation, and chimney structure, especially the application of CO combustion control technology and sealed viewing door, the oxygen volume fraction in the furnace has been reduced from 3.0% to about 1.5%, improving heat efficiency and enhancing the safe operation ability of the heater, achieving the goals of energy conservation, emission reduction, and long-term operation.

Key words: residue hydrogenation, feed heater, bottom-burning trapezoidal heater, coil arrangement, heater steel structure, CO combustion control technology, sealed heater viewing door, uniform tube-type flowmeter