Please tell me - How to reduce the nitrogen content in the raw gas?
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Our plant's fixed-bed white coal intermittent gasification to produce methanol feed gas has a nitrogen content of about 7%, resulting in increased venting. At which stage? How to reduce nitrogen content? How low can it usually be? Thanks! ! :) :) :handshake
This is difficult. It is estimated that the N content in your raw coal is too high, so you can only reduce the N content in the raw gas by venting.
The fixed bed is vaporized with air, so the presence of nitrogen is normal.
The main problem is that the gas production reduces the air blowing percentage. The nitrogen content of the raw gas here is more than three points. If the nitrogen content is too high, we need to increase the discharge of the relaxation gas or open the synthesis tower and vent it.
The N content in raw coal is relatively high, and the N content in the raw gas can only be reduced by venting.
I personally think that the problem should be gas production. The key to white coal intermittent gasification is to reduce the air blowing percentage under good control of the furnace conditions (white coal gas production furnace conditions are relatively difficult to control). The ratio of purge gas to circulating gas is determined based on the inert gas content and carbon-to-hydrogen ratio in the circulating gas, the pressure of the synthesis system, and the reaction temperature. Rather than being static.