[Weekly Topic] May 28–June 3, 2011
Thread Content
During the normal operation of the Linde low-temperature methanol washing process, how can contamination of the circulating methanol be prevented and methanol loss reduced (lowering methanol consumption)? Note: 1. Participants who are willing to offer rewards of varying degrees are encouraged to speak up. 2 In accordance with the forum rules, please do not use hidden replies; otherwise, no score will be given.
Sorry, the hiding failed; I just managed to get that sofa after much effort, I’m so excited, haha
For carbon dioxide products, exhaust gases, process gases, and acidic gases, there are fixed limits for methanol content; as long as these limits are not exceeded, the losses are generally constant with little variation. The main source of higher losses is the methanol content in the wastewater generated by the methanol-water separation tower. Additionally, methanol loss due to the cleaning of pumps, filters, and equipment can also be minimized as much as possible.
Operate as steadily as possible; slow down when increasing or decreasing the load!
Analysis of the reasons for high methanol consumption: 1. The temperature of the feed gas entering the low-temperature methanol washing unit is high. The cooling temperature in the refrigeration section 2 does not meet the required levels, which prevents it from providing sufficient cooling for the methanol washing system; this in turn results in a high temperature of the methanol in the system and an increase in energy consumption. 3 High temperatures of the H2S-rich exhaust gases, inadequate cooling and recovery of methanol, or inaccurate liquid levels in the several methanol collection tanks in the methanol recovery section result in a large amount of methanol being carried along. In the 4-methanol distillation system, the methanol concentration at the bottom of the distillation tower was not within the specified limits, which resulted in an increase in emissions. 5 Inadequate flashing in the methanol CO2 flash tower leads to an increase in methanol temperature.