Fixed-bed intermittent oxygen-enriched gas production
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It’s still the same procedures for producing gas in a fixed-bed batch process, only oxygen-enriched air is used, raising the oxygen content in the air to 20%–30%. This improves the efficiency of gas blowing, reduces the time required to meet the blowing requirements, and increases the time needed for gas production. As the increase in oxygen content also results in higher heat for gas production, the decomposition rate of steam is also higher. What’s wrong with such a program?
As mentioned in the forum on oxygen-enriched continuous gas production, some manufacturers have achieved good economic benefits. But it is only suitable for producing synthetic ammonia or syngas. Because the levels of nitrogen and carbon dioxide are high, when producing monohydric alcohols, the compression power consumption and the amount of gas released will be very high. Oxygen-enriched intermittent gas production is theoretically feasible and can improve the steam decomposition rate and gas production efficiency; however, it remains to be determined whether the benefits obtained outweigh the investment in oxygen production equipment and the costs associated with oxygen production. Continuous pure oxygen gas production is also an alternative approach. It is hoped that the technological upgrades for fixed-bed reactors can accelerate, thereby resolving the numerous challenges faced by such reactors.
Using pressure swing adsorption for oxygen production requires less investment and has lower operating costs, saving a lot of money compared to large-scale air separation systems
Yes! It’s indeed necessary to calculate the costs; if there is excess oxygen available, it can be considered.
What was said on the first floor seems to indicate that the Taiyuan Fertilizer Factory started doing this as early as 2006, by introducing oxygen at the inlet of the fan, with nothing else being changed. I heard it’s also possible. But later they also switched to oxygen-enriched continuous gasification. As for why, I’m not quite sure.
In oxygen-enriched gas production, the key lies in the generation of oxygen enrichment. Technologies such as pressure swing adsorption, air separation, and membrane separation all require significant investment. For small investments and low gas production levels, it’s not worth considering such options. This post was last edited by onefly2009 on 2009-3-24 21:36.]
The existing air separation unit has capacity left over, so this approach is feasible; however, it would be uneconomical to set up an air separation unit solely for oxygen-enriched batch gasification – it’s better to use a continuous gasification process instead. I know of a few plants that have excess air separation capacity; I think they could allocate a few units for this purpose.
An oxygen-enriched inlet in front of the fan is not feasible, as the gas causes excessive corrosion to the fan impeller. It needs to be replaced in less than a week. Regarding investment, it’s better to invest less in pressure swing adsorption. If continuous gasification is used, pressure swing adsorption also costs a lot of money. At this stage, it’s necessary to recover the least amount of money in the shortest possible time so as to purchase other equipment.