What preparations should be made for the desulfurization tower before it is started up?
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What preparations should be made for the desulfurization tower before it is put into operation in hydrorefining?
During shutdown, it is essential to shorten the circulation path in the distillation system; the stripping steam should not be stopped, and efforts should be made to remove all hydrogen sulfide from the system. After oil removal, the steam injection tower should remain in that state for at least 48 hours; it is advisable to inject water into the tower once or twice during this period. When stopping the steam supply, it is advisable to introduce nitrogen at the same time to maintain a slight positive pressure; once the temperature drops below 50 degrees, the nitrogen supply can be stopped, and holes can be made layer by layer from top to bottom.
It is best to fill the tower with water during steaming, and finally rinse it from top to bottom with cold water
It depends on your equipment. Generally, full tower operation is not used; either the liquid level at the bottom is controlled or the level at the top. Usually, measures are taken to prevent liquefied gas from being carried out from the bottom of the tower, with more control at the upper level, and some control also at the lower level, though less so.
1) Listen for any abnormal noises and check whether the pipelines are vibrating. 2) Check whether there are any leaks at the connection flanges of the inlet and outlet pipelines, valves, measuring instruments, etc.; inspect for any signs of leakage, and verify that the equipment is in good condition and that the pipelines are not deformed. 3) Examine the on-site level gauges and primary level indicators, and compare their readings with those indicated on the process sheets to ensure they fall within the specified ranges. 4). Check the on-site pressure gauge and primary pressure meter, and verify with the operator to ensure that they are within the values specified in the process sheet. 5). Check the opening degree of the hydraulic control valve and verify it with the operator on site. 6). Check whether the stop valves before and after the safety valve in service are fully open, whether the lead seals are intact, and whether the temperature of the pipelines downstream is normal.