A design from over 20 years ago

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After working in industrial automation, I left the coking plant. In the blink of an eye, more than 20 years have passed. Recently, while organizing some documents, I came across some designs I created back in the day at a coking plant in a major city. They brought back many emotions, and I’d like to share them here. However, coking technology has advanced by leaps and bounds in recent years; I wonder whether these “masterpieces” of mine still hold any practical value. Nevertheless, I hope they can serve as a starting point for further discussion. Back then, our factory did not have any desulfurization system; when we started preparing to implement one, it happened to be the peak period of PDS usage, so we designed our own desulfurization system using PDS as a catalyst. Unlike traditional desulfurization equipment, we did not use \"tall and narrow\" regeneration towers (as there was no available compressed air); instead, we designed \"short and wide\" regeneration tanks. Six self-designed injectors are used to draw in air through the desulfurization liquid, which yields excellent desulfurization results with low investment costs. However, no comparative analysis of operating costs was conducted. I also designed on my own the final naphthalene removal tower—it’s a spray tower; the circulating liquid is cooled by a spiral plate heat exchanger, and tar is mixed into the circulating liquid to absorb naphthalene. The specific mixing method involves using a gear pump (equipped with variable frequency speed control to regulate the amount of tar added) to feed the tar into the inlet of the circulation pump ； The tar at the bottom of the circulation tank flows out under its own pressure. The volume of the circulation tank should be somewhat larger, allowing the tar to be replaced in layers as much as possible, thereby achieving a better naphthalene washing effect. Many coking plants are currently facing the problem of increased resistance in the cross-tube primary coolers. This led me to think that using an air spray tower (with recycled liquid mixed with tar) at the first stage of cooling, before the cross-tube primary cooler, might yield better results. I don’t know why the design firms don’t use this method; if they do use it in the future, please remember to pay me. At the time, considerable thought was put into designing the ladder platform for this tower. For a single tower, the only reference material available was that of a spiral staircase with steps directly welded to the tower body, used in towers with a relatively large diameter ； The ones with a smaller diameter are vertical straight ladders. At the time, I had a sudden inspiration (I really hadn’t seen any similar designs before); by rotating the angle via a fan-shaped gradual ramp, I managed to create a “tilted straight-ladder spiral ascent” on a single tower. Thank you for reading this patiently; goodbye.