At the same time, according to the company’s arrangement, the device will undergo a large-scale technical transformation in the fourth quarter of this year. In order to ensure the effective connection between the overhaul and the reconstruction of the equipment, the workshop will stop and recycle the materials after the equipment expires. After the construction time of the renovation project is confirmed, the process of catalyst unloading and equipment cooking will be reversed. Since the material of the device contains medium such as carbon tetrachloride and toluene, the difficulty in overhauling the device is to achieve “zero emission” during the parking phase. To this end, the workshop teamwork has been researched, explored and demonstrated by multiple parties, and has repeatedly optimized and optimized the “zero emission” scheme for optimal and environmentally friendly installations, and organized the implementation according to the plan. Firstly, the workshop fully analyzes the carbon tetra-materials in the butadiene tail gas hydrogenation unit system from toluene by extending the toluene heat transport time, delaying the shutdown of the compressor, and appropriately reducing the pressure at the top of the tower.
It is sent back to the aromatics tank area, which is the first step to ensure safe parking and green parking. Secondly, the workshop delays the operation of the compressor and maintains the system at a relatively high pressure, which facilitates the emptying of the toluene adsorbed by the catalyst in the two-stage reactor and improves the system by using hot nitrogen purge. The residual liquid toluene in the dead corner, blind end and other places, so that the toluene material in the system is completely emptied, and finally all the pouring and emptying on the site are opened one by one, and the last remaining materials are emptied one by one by means of barrel connection. Finally, the most difficult bones for green parking are how to deal with the exhaust gas emitted by the two-stage reactor catalyst passivation. Because of the design flaws of the process itself, the top of the reactor does not have the conditions for the torch. In this regard, after many technical breakthroughs and integration of various resources, the workshop decided to borrow their portable adsorbers from the aromatics workshop, one end connected to a reactor outlet tank regulating valve FV3015, and the other end connected to No. 2 Ding Er The olefin regenerator waste gas venting tube at high altitude has effectively solved this problem by artificially adding a temporary flare line to the reactor. During the parking phase of the plant, the workshop recovered a total of 40 tons of carbon and 40 tons of waste toluene, which achieved complete harvesting. The catalyst passivation treatment, disassembly and preservation of the two-stage reactor were also successfully completed. During the period, there was no obvious odor on the site, indicating that the device achieved “zero emissions”.
The device realized green parking, which laid a good foundation for the major revision work.
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