Regarding the issues with the furnace tubes in atmospheric pressure furnaces
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Previously, the furnace tubes in atmospheric pressure furnaces were basically vertical type; however, in some newly built refineries today, the furnace tubes in such furnaces are horizontal type, as seen in places like Tianjin Petrochemical and Wuhan Refinery. What are the constraints, advantages, and disadvantages of this design?
In recent years, as crude oil has become heavier and of lower quality, more heating furnaces equipped with horizontal tubes have been used. The conditions under which horizontal tubes are typically chosen are: when the medium inside the tube is prone to cracking or coking, or when high product quality is required and it is necessary to prevent local overheating and cracking of the medium； The medium inside the pipe contains solid particles ； The medium inside the pipe is in a gas-liquid two-phase state.