I would like to ask the teachers about the gasification process in aerospace furnaces
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I would like to ask the experts: currently, many small nitrogen fertilizer manufacturers across the country are carrying out capacity replacement, eliminating fixed-bed gas generators in favor of more efficient space-time reactors. The subsequent purification processes have also changed; for example, low-temperature methanol washing is now used. What are the advantages of this approach? What is the overall subsequent process flow for ammonia synthesis? Thank you all:handshake
Gas generation, conversion, purification, compression, synthesis
I don’t know either; I just want to give it a try
Compressed gasification involves fewer system processes compared to traditional fixed-bed gasification. In traditional gasification, the gas exits the inlet tank, is compressed, then undergoes transformation, desulfurization, and decarburization; after that, it goes through further purification steps such as dimethylation, methanation, alkoxylation, or refining, before being compressed again for use in synthesis. The hydrogen-to-nitrogen ratio is adjusted during gas production； The gas produced by pressure vaporization goes directly to the shift unit, where acidic gases are removed through low-temperature methanol washing. It is then purified further using liquid nitrogen, and the hydrogen-to-nitrogen ratio is adjusted, before being compressed for use in synthesis. The space furnace is not a Tsinghua furnace.
There are quite a few of them nationwide using the water-coal slurry pressurized vaporization furnace technology; Xinlianxin Chemical Industry’s facility in Xinxiang has been operating stably for 8 years now. Fixed-bed reactors are almost completely phased out
What I have experience with is ammonia synthesis using shell furnaces, and the process is similar to what you described. The syngas produced by the shell furnace first enters the shift process ； Then proceed to low-temperature methanol washing to remove acidic gases ； Then proceed to washing with liquid nitrogen at low temperature ； Then it enters the ammonia synthesis tower through the compressor. In this process, it’s obvious that the manufacturing sequence is shorter; I had seen the traditional process during my school days, and in that case the compressor had to move in and out, making the overall process much longer.