Discuss the impact of diol on ammonia synthesis

In the overall ammonia production process, dihydrazine mainly serves to protect the purification of the raw gas used in ammonia synthesis. Therefore, an appropriate alcohol-to-ammonia ratio plays a positive role in saving energy and reducing consumption in ammonia synthesis. First, it is essential to ensure the purification of the feed gas. Secondly, it is also necessary to take into account changes in the process conditions for gasification; once the CO level is controlled too tightly, it will have a significant impact on gas production. Therefore, coordination between different stages is essential to ensure stable operation.

Thank you for your participation. Are there any relevant data reports available? Could you provide it? A summary of related usage is also acceptable.

We have options for low pressure, medium pressure, and high pressure. At low pressure, substances such as CO are consumed to produce methanol； Compared to medium and high pressure, it has lower power consumption, but the volume of gas processed is relatively higher. For the same output level, this approach is still more cost-effective. In the context of overall ammonia synthesis, medium pressure is generally not cost-effective; it’s better not to use it. Instead, low pressure combined with high pressure should be used. High pressure helps to remove substances such as CO from the gas, thereby enabling the production of methanol. However, whenever methanol is produced, it affects ammonia synthesis, as the total amount of ammonia and methanol increases, which in turn raises the methane content in the gas fed into the synthesis process. This affects both the volume of gas processed and the amount of gas that needs to be released. :victory::victory:

Very good; the explanation is quite comprehensive. However, in my opinion, when deciding on the pressure level for older devices, it is necessary to take into account their original configuration. For example, if it was originally compressed to level 7 and there is no setting point for the low-pressure stage, using 3.5 MPa may result in costs and operating cycles that are not cost-effective.

We have low-pressure polyol-high-pressure alcohol, alkane, synthesis processes; the low-pressure alcohol process operates at 5.5 MPa, while the alcohol-alkane synthesis process operates at 22 MPa. There are two sets of processes in total, one operated by Jutuo and the other by Guochang； The low-pressure compressor has four stages, while the high-pressure compressor has two stages; purification of CO and CO2 at high pressure is more thorough, with the concentration of CO+CO2 in the syngas being less than or equal to 10 PPM. The methane content is around 1.5%, and about 20% of methane is released into the atmosphere. The circulation volume is 550,000 units, with an ammonia purity of around 9.5%, resulting in an ammonia production capacity of 1,760 tons per day ； For PSA decarburization, the low-pressure alcohol, high-pressure alcohol, alkane, and synthetic catalysts have all remained stable after more than 3 years of operation.

This configuration is only reasonable in newer process configurations. It’s very difficult to upgrade old devices.