Crystallization in the ammonia cooler of low-temperature methanol washing

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Dear seniors, I was wondering if you have encountered the problem of leakage in the ammonia-cooled coolers located between the sections of a low-temperature methanol wash absorption tower. This leakage results in a significant reduction in the heat exchange efficiency of these coolers; as a result, it is necessary to reduce the load while finding ways to remove the methanol from within the coolers. Currently, a negative-pressure drainage tank is being used, with the liquid discharged from the coolers being connected to this tank through drainage pipes. The gas phase from the drainage tank is connected to the gas phase of the coolers in order to create negative pressure. However, due to the leakage of carbon-rich methanol into the coolers, ammonium salts crystallize, making it impossible to remove the liquid. Is there anyone who can help solve this issue? Thank you!