Discussion on temperature and coal consumption in ammonia synthesis
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This post was last edited by lxq700918 on 2010-8-8 20:02. I wonder if everyone has noticed this: during the summer production of synthetic ammonia, although output decreases due to various unfavorable factors such as high gas temperatures, the coal consumption for gas production does not decrease; the same amount of coal is still used. As a result, the coal consumption per ton of ammonia produced increases. Please discuss what could be the reasons for this and whether there are any good solutions Why can’t the load for gas production be reduced?
With the total output falling, various consumptions naturally increased. Some factories use graphite heat exchangers to cool semi-water gas before it enters the compressor, and this approach yields a fairly significant increase in production.
The consumption metric is calculated based on the amount of process media required to produce one ton of synthetic ammonia. As a result, the amount of process medium consumed remains essentially unchanged, while the ammonia synthesis output decreases due to the lower compression volume caused by high temperatures in summer. Consumption will definitely increase in this way.
Additionally, the energy consumption for ammonia liquefaction and separation also increases as the ambient temperature rises
The main issue is the high inlet temperature of the compressor, which results in poor air compression capacity; using lithium bromide to lower the inlet temperature could be considered
In fact, the answer to the original poster’s question should already be clear: the most important thing in ammonia production during summer is cooling.
My main issue is the low production of synthetic ammonia; where does all the gas produced from the large amount of coal used in gas generation go?
Reply to 7# Chemical gas purification: The exit temperature of the synthetic water cooler is high, ammonia separation is poor, and the synthetic reaction does not proceed well. With the same process load, the synthetic pressure is high, which inevitably results in a larger amount of gas being vented. All the extra coal that is burned to produce gas is discharged through this process.
Using a graphite heat exchanger to lower the inlet temperature of the compressor – I’ve never heard of that before! May I ask: under the same conditions, how does the performance of a graphite heat exchanger compare to that of a conventional heat exchanger? By how much can the temperature be reduced upon entry?
Reply to 9# lxq700918: The heat transfer coefficient of graphite heat exchangers is 6 times that of other heat exchangers
Some people are using graphite heat exchangers to lower the inlet temperature of compressors. Has anyone tried it? I’m not sure what the results are