THE CAUSE OF SHELL SIDE BLOCK IN LEAN/RICH METHANOL EXCHANGER
During the operation of a low temperature methanol washing plant,there occurred come abnormal cases,such as the circulating volume of sulfur-rich methanol in the shell side of lean/rich methanol exchanger decreased,the temperature of sulfur-lean methanol in the tube side rose up,liquid accumulated in the lower part of the reabsorber,the level of the regenerating column became lower,and methanol was entrained in the tail gas,etc.As the condition became worse,carbon dioxide and sulfide content in the purified gas often exceeded the requirement in the standards.Therefore a series online maintenance schemes were set up and executed.When the plant started up again,the circulating volume of sulfur-rich methanol recovered to the normal,and the load of the plant increased from 65.0%before restart to 76.5%afterward.
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