＃＃Schedule a visit＃＃ There are issues with the synthetic ammonia system that requires two washes
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Our plant is a newly built ammonia synthesis facility. In the gas purification unit, it features LINDE’s two-stage washing system (methanol washing and liquid nitrogen washing), and ammonia compressors (Shenmu’s centrifugal ammonia compressors) are installed for these washing processes as well as for the ammonia storage area! What I would like to ask is whether production can continue when the ammonia compressor stops working, given that the pressure in the preceding system decreases. If it is possible, for how long can production be maintained? If not, should the methanol circulation be continued or stopped?! Note: The ammonia compressor is driven by a turbine. This post was last edited by sgwwood on 2007-12-15 at 13:04
Our company uses methanol washing followed by methanation; when the ammonia chiller associated with the methanol washing unit fails, the feed to the upstream system is immediately reduced, or gas is vented before it enters the methanol washing unit after the shift reaction. The load of the methanol wash unit is about 40% of full capacity, providing sufficient time to inspect and restart the ammonia chiller; this time has at times exceeded two hours. Load has no effect on methanation. As for the cleaning with liquid nitrogen, it requires the expertise of those familiar with this process. The ice maker in question is connected to an ammonia storage tank; I’m not sure how the pressure in that ammonia tank is maintained We also figured it out on our own – total gas loss is too high. This post was last edited by huangwf98 on 2007-12-13 20:19.]
Thank you for your answer. The pressure control in our ammonia storage facility is achieved through two additional small refrigeration units driven by 6000V high-voltage motors; these units can be activated when the cryogenic ammonia compressor is in operation.