Is the transformed water-carbon ratio a ratio of mole numbers or a ratio of masses?
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Calculated based on the process material balance sheet provided by the design institute, it is a molar ratio. I wonder if this is the case in actual production? What is the usual range for controlling the water-to-carbon ratio in normal operations? (Pure oxygen catalytic partial oxidation method) What is also the ratio of coke oven gas to oxygen? In the overall balance for methanol production, there is a discrepancy between the data provided in the blueprint and feasibility study reports submitted by Huadi Research Institute regarding whether the steam generated on-site can be used internally; one report indicates that it can be used internally, while another suggests that nearly 5 tons of steam per hour need to be supplied from outside. What is the actual situation during full-scale production? Also, my company’s gas holder is located more than 600 meters away from the coke oven gas compressor; the pipe diameter is 900, and the pressure in the gas holder is 200–300 mm of water column. Is such a pressure sufficient to meet the requirements of the compressor’s inlet pressure? I calculated it using the pressure drop formula, and the pressure drop is only 50 mm of water column? Is the calculation incorrect? Have you all encountered such examples in actual production?
We use the coke oven gas to produce methanol; in general, it is necessary to consider the water-to-carbon ratio, as the composition of coke oven gas remains relatively stable, so there is no need to recalculate the water-to-carbon ratio. Typically, this ratio ranges from 0.8 to 0.9, and the optimal value can be determined by considering the methane conversion rate and the concentration of CO. Don’t set it too low, as it tends to form carbon deposits.
1. Calculated based on the process material balance sheet provided by the design institute; it is a molar ratio. In actual production, the water-vapor ratio control value is generally kept between 0.8 and 1.0; too high a value leads to significant steam loss, while too low a value results in carbon deposition. 2. The ratio of coke oven gas to oxygen is less than 0.2. 3. In the overall balance for methanol production, the steam generated internally is sufficient; our plant even has a surplus of nearly 8 tons of steam per hour. 4. Additionally, our company’s gas holder is located more than 600 meters away from the coke oven gas compressor; the pipe diameter is 900, and the pressure in the gas holder is 200–300 mm of water column. This pressure is sufficient to meet the requirements of the compressor’s inlet pressure. We have been running for over a year now. 4. I calculated it using the pressure drop formula, and the pressure drop was 50 mm of water column, which is exactly correct. There is no need to doubt the above process conditions.
To be precise, it should be a molar ratio, but for convenience, it is usually expressed as a mass flow ratio or a volume flow ratio; in operational displays, it is also shown as either volume flow or mass flow
We use the natural gas single-stage furnace steam conversion process; in calculations, the mass ratio is multiplied by a constant. The water-to-carbon ratio should be maintained between 3.2 and 3.5; too high a ratio leads to excessive steam loss, while too low a ratio results in carbon deposition.
You mean coke oven gas, right? When using pure oxygen to produce methanol from coke oven gas, there is usually an excess of steam; if there isn’t enough steam, it’s because too much was added.
1. Based on our production, it is accurately a volume ratio; in reality, it is a molar ratio. 2. For the production of methanol from coke oven gas, it is generally required to keep the water vapor ratio between 0.8 and 1.0, while the water-to-carbon ratio is not controlled. 3. The oxygen-coke ratio should generally be kept below 0.2, and it needs to be adjusted according to the requirements for the temperature at the outlet of the converter.
It should be a molar ratio; in practice, a volume ratio is used (= molar ratio)
2. The ratio of coke oven gas to oxygen should be less than 0.2; in other words, the coke-oxygen ratio should be greater than 5
It should be a molar ratio; we are dealing with coke oven gas, and the water-to-carbon ratio is generally between 2.0 and 2.15
The molar ratio, which is what we refer to as the ratio of the number of atoms; of course, some modern processes take into account two additional parameters: the water-carbon ratio and the oxygen-carbon ratio