A plant with an ethylene production capacity of 1.4 million tons per year is about to enter maintenance mode; seeking advice regarding the issue of emergency cooling water discharge
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bk11.jpg The 1.4 million tons/year ethylene plant of a certain facility has been in operation for over 3 years since its initial commissioning at the end of 2019, and it is about to undergo its first major maintenance campaign since that time. We are seeking online assistance regarding how to empty the quench water in the propylene column reboiler； Specific details: The main cold water pipeline has a diameter of 44 inches. Towers No. 1 and No. 2 for propylene processing are equipped with 8 reboilers that use cold water as a heat source. All 8 reboilers are floating-head type heat exchangers, and each of these exchangers has dedicated cold water outlet lines; these lines converge into a main cold water discharge pipe located at 8.7 meters high in the pipe gallery, from where the cold water is sent to the underground tank designated for storing cold water in the cracking unit.
Zhejiang Petrochemical has entered its first major maintenance period.
Before carrying out major maintenance, it is necessary to empty the quench water in the propylene column reboiler in order to avoid potential safety incidents and waste. The following are the specific steps for emptying it: 1. Close the inlet valve of the quench water main pipe to stop the supply of quench water to the reboiler. 2. Close the quench water inlet valves in the 8 reboilers to cut off the flow of quench water into the reboilers. 3. Open the quench water outlet valves of the 8 reboilers to discharge the quench water into their respective discharge lines. 4. In sequence, close the quench water outlet valves of the 8 reboilers one by one until all the quench water has been discharged into the discharge line. 5. Open the discharge valve on the emergency cooling water discharge main to release the emergency cooling water accumulated in the main into the emergency cooling water sump. When performing the operation of draining the quench water, strict operating procedures must be followed to ensure the safety and effectiveness of this process. At the same time, the emptying process must be carried out under the supervision of professionals, in compliance with relevant safety procedures, to ensure the safety of the entire operation.