Treatment of coking accidents

This post was last edited by lijianhuai on 2011-8-27 at 10:33. Reply to 1#: Good intentions. The top priority in coking is to prevent the furnace tubes from coking up (of course, the basic prerequisites are no fires or explosions). Other important aspects include avoiding tower overpressure, flooding, oil leaks, and other types of leaks. I will discuss in detail how to handle power outages in a 1-million-ton coking plant at a later time. Due to electrical issues and other reasons, this plant may experience short-term power outages; this plan has been formulated to prevent serious accidents and to ensure that production can resume as quickly as possible once power is restored. I. Stoker position: Immediately shut down the furnace in case of a power outage; open all six 3.5MPA steam valves to full capacity to purge the furnace tubes and prevent coking inside them. Once power is restored, start the radiation pump and then ignite the furnace to raise its temperature. II. Coking position: 1. First, close the preheating valve at the outlet of the radiation pump; then sequentially close the outlet valves and preheating valves of the seal oil pump, gasoline pump, sulfur-containing wastewater pump, as well as those of the side line pumps in the distillation tower, to prevent cross-connection of fluids. 2. Monitor the temperatures and pressures in the coke tower and distillation tower; when the pressure is high, open the flare valve for venting to prevent overpressure. 3. After the power is restored, start the oil-sealing pump and the radiation pump first; once everything is operating normally, start the side-line pumps on all sides of the distillation tower to establish reflux. The product is first transferred to the non-conforming line, and once it is in good condition, it is moved to the conforming line. III. Absorption stability: 1. After a power outage, quickly close the rich gas air-cooling outlet valve and the dry gas export manual valve (on the desulfurization second-floor platform), as well as the control manual valve for the double-desorption lean liquid, to prevent liquefied gas in the dry gas from flowing back. 2. Close the outlet valves of each pump in sequence to prevent overpressure and excessive liquid level in the towers. 3. Closely monitor the temperature, pressure, and liquid level of each tower; negative pressure must not occur. 4. After the power is restored, start the pumps to establish circulation in the three towers as well as the double dehydration system; activate the pump of the compressor’s light oil station, and start the rich gas compressor as soon as possible to resume production. All positions should strengthen communication, contact the dispatch team promptly, resume production as soon as possible after a power outage, and strive to minimize losses.

The principle is to prevent overheating, overpressure, leakage, and cross-contamination of media!