What is the typical ammonia content in the transformed water gas?
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What is the typical level of ammonia content that should be controlled in the transformed water gas, and what impact does it have on low-temperature methanol washing?
The ammonia content in water gas is low; it generally dissolves in the condensate. Even less ammonia is present in low-temperature methanol washing, so it has little impact on this process.
What impact does it have on low-temperature methanol washing? Will ammonium salt crystals form?
With so many ammonia coolers, if even a few of them leak, the impact could be greater than that caused by ammonia in the gas stream
A high ammonia content certainly has an impact on low-temperature methanol systems, as crystallization and blockages can easily occur at the top of the thermal regeneration tower. The Ruchi flow line with ammonia-containing methanol emission lines takes this into account. It’s scheduled once a week. Lind doesn’t seem to have one.
Ammonia refrigeration is not very good; it is generally used in systems for producing ammonia. Currently, acrylic is mostly used.
There should be an ammonia scrubber to remove ammonia before entering the low-temperature section.
After removal in the ammonia scrubber, a residual amount remains, around 10 PPm, which gradually accumulates within the methanol scrubbing system
There is no NH3 in water gas, but ammonia is produced as a by-product after the shift reaction. Ammonium salts are formed within the methanol washing system and accumulate in the acidic gas system
Water gas uses steam as the medium for transporting gases, and it contains no nitrogen; therefore, the ammonia in water gas primarily comes from the gasification process, with very little being produced by the shift converter； If Shell’s process is used (the water gas process mentioned earlier generally employs Texaco’s technology), then the gases fed into the shift reactor are mainly nitrogen, hydrogen, carbon monoxide, carbon dioxide, etc. In the shift reactor, a reaction takes place between nitrogen and hydrogen to produce ammonia, and it is this reaction that results in the generation of ammonia.