Knowing the annual production volume of ammonia, how to calculate the hourly flow rate of raw gas

The coal consumption for raw materials can be calculated based on the tons of ammonia produced. For ammonia synthesis plants with different processes, as well as with different types of coal, the consumption levels vary. You can take a look at the posts available online and compare them; by knowing which process you use and what type of coal you employ, it’s possible to estimate the coal consumption. Check out information on ammonia synthesis consumption (click here)

You can use the ammonia production amount divided by its molecular weight and then by 22.4; after that, divide the result by the total amount of H2 and N2 in the feed gas to obtain the flow rate of the feed gas. This is merely a theoretical calculation method – it does not take into account losses due to leaks or venting gases. It’s estimated that there might be a loss of around 2% as well. Here, we generally calculate based on 3000 M3 of feed gas per ton of ammonia produced

It’s difficult to calculate; it depends on the raw materials used, as well as the composition of the feed gas

If there is an annual production volume of ammonia, it’s easy to calculate the hourly volume of feed gas. Generally, it is calculated at 8,000 hours per year, which is about 333 days. The hourly ammonia production can be obtained by dividing the annual total production (expressed in tons) by eight thousand. The volume of raw gas per hour can be obtained by multiplying the ammonia production per hour by 3300, with the unit being Nm3/h. 3300 represents the standard volume of raw gas required to produce one ton of ammonia.

I’m sorry; I thought it referred to the volume of refined gas. It shouldn’t be 3000 NM3 – it should be 3300 NM3. The answer given on floor 5 is more correct

The reaction of ammonia synthesis also obeys the equilibrium of three chemical reactions, namely: energy conservation, momentum conservation, and mass conservation. Knowing the annual production of ammonia, it is not difficult to calculate the hourly production. It is generally calculated based on 310 working days per year (333 days can also be used for those in higher floors). Calculations can be carried out based on material balance; in other words, one molecule of ammonia is formed as a result of the reaction between 3 molecules of nitrogen and 1 molecule of hydrogen (hence, in production, an appropriate hydrogen-to-nitrogen ratio of around 3 is required). Once the composition of the feed gas is known, it is possible to determine the consumption rate of that feed gas. The raw gas consumption quota per ton of ammonia is 3300 NM3. The volume of tons of ammonia under standard conditions can be determined by calculating the number of moles based on its molar mass. This yields the standard consumption rate of raw gas per volume unit under standard conditions.