What is the approximate effective gas volume required to produce 300,000 tons of methanol per year?
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Like the title, I want to know how to calculate it, thank you all
It depends on the coal quality. What kind of coal are you?
Effective air volume! One methanol is one carbon. C accounts for 37.5% of the mass of the methanol molecule. In other words, 300,000 tons of methanol contains approximately 112,500 tons of C (assuming 100% purity). The synthesis gas produced by using different coal qualities and different processes is different. Speaking of CO gas alone, it is 112,500 tons divided by 12 to find out how many moles c and then multiplied by 22.4 is the approximate volume of CO. Of course, the CO consumed to adjust the hydrocarbon ratio during the conversion and crude methanol, purge gas, etc. contain a small amount of CO. This is all related to the composition of the syngas coming out of the gasifier and the gas production per ton of coal. The above is just my opinion as a newbie in coal chemical industry. I hope some experts can point out my mistakes and the correct calculation method. This post was last edited by Hada on 2008-2-21 17:28 ]
Brief reply: 1. Although CO2 also participates in the reaction to generate methanol, since methanol synthesis mainly involves CO and H2, in daily production and engineering design, the effective gas generally refers to CO+H2. 2. The ideal gas composition for methanol synthesis should be (H2-CO2)/(CO+CO2) = 2.05. 3. The effective gas consumption per ton of methanol varies greatly under different methanol synthesis pressures, different catalysts and hydrogen recovery methods. 4. According to general conditions, 5.0MPa low-pressure methanol is synthesized and the hydrogen in the purge gas is recovered. According to theoretical calculations, the production of one ton of methanol requires the consumption of 2100Nm3 of effective gas (CO+H2). However, there is still a certain gap between actual production and theoretical calculations. In engineering calculations or normal production, this data is generally 2300Nm3. 5. Annual production of 300,000 tons of methanol. Calculated based on the annual operating time of 8,000 hours, the hourly output is 37.5 tons of methanol. Calculated based on the effective gas consumption of 2,300Nm3 per ton of methanol, the hourly effective gas (CO+H2) amount is 86,250Nm3. The above data is for reference only. This post was last edited by zjyang168168 on 2008-2-22 08:44 ]
Under normal circumstances, the CO+H2 of the gasification system with a methanol capacity of 300Kt/a is ~94000Nm3/h
Can approximately 560kg of coal produce 1000Nm3 (CO+H2) gas? ? ? ? shell craft! !
What the 4th floor said is basically correct. In theory, 1 ton of methanol requires an effective gas volume of 2100Nm3. The actual industrial design takes 2250~2260Nm3. The operating time of a general device is 7200 hours/year, which means that the methanol production is 41.67 tons per hour, which is equivalent to an effective gas volume of 93750~94160Nm3/h.
The question on the 6th floor is specific coal consumption, which is related to the nature of the coal. If the coal is high-quality, the shell process specific coal consumption will not reach 560, and the low-quality coal may be higher than 600. Therefore, the specific coal consumption is just a publicity value. The carbon conversion rate in coal is the most important for the stable and reliable operation of the device.
Replenish: 1. In recent years, coal gasification technology providers often use the concept of specific coal consumption (the amount of coal consumed to produce 1000 m3 of effective gas (CO+H2)) when promoting their technologies. In fact, it does not make much sense when comparing different gasification technologies. As mentioned above, different gasification processes use different types of coal. Even for the same gasification technology, different raw coals used will lead to large differences in specific coal consumption. 2. Evaluate the advantages and disadvantages of a coal gasification technology, generally including coal type adaptability, oxygen consumption, carbon conversion rate, thermal efficiency, etc.
1: In methanol synthesis: H2-CO2/CO+CO2=2.05~2.15. For different gasification methods, the CO2 content in the raw gas is different. Different synthesis methods have different conversion rates, so the exhaust gas components are different. Depending on the amount of circulating gas, the circulation ratio of the ICI low-pressure method is 6.03, and the lurg low-pressure method is 5. According to the controlled CO2 content in the raw gas, if it is 3%, the lurgi low-pressure method can be set to fresh gas 2300Nm3/ton of methanol. The natural gas conversion can be set to 3250Nm3/ton of methanol. The coking enterprise's joint production of city gas can be set to 3560Nm3/ton of methanol. The above views are not complete and are only for reference. Criticisms are welcome.
Calculated based on 7,200 hours/year of continuous operation and the device load adjustment range of 110%, approximately 110,000NM3/hour is required. Personal opinion is for reference only.