Hydrocracking reaction feed control
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My unit processes 1.5 million tons of hydrocracking per year; it uses pre-furnace hydrogen mixing. In order to control the temperature of the gas phase at the top of the thermal high-pressure separator, cold and hot feed streams are provided at the outlet of the feed pump. The pipelines for these cold and hot streams, as well as the control valves, are all of the same size, which makes it difficult to control the valves. Normally, their opening degree is between 1 and 2; small changes in the opening degree of the cold stream valve have a significant impact on the temperature, as well as on the amount of reactant fed into the system. What is the purpose of designing the cold stream control valves to be such a large size? Wouldn’t it be better to design them to be smaller, thereby making control easier?
Generally, cold-line pipelines are two sizes smaller than the main pipelines. The design intent usually matches the results of simulation calculations, which in turn depend on various operating condition data provided by the client and the catalyst supplier. The fastest way to find out is to ask the design institute directly
Make the cold flow control valve smaller. Turn off the heat flow control valve.
Is the cold road getting smaller? Fix it? Has the hot circuit been turned off? It is necessary to ensure the feed rate