Specific oxygen consumption, specific coal consumption, cold gas efficiency, overall energy consumption

It’s hard to answer so many questions at once; I suggest checking the posts in this discussion forum first, as they basically cover all your questions.

1. Oxygen consumption ratio refers to the amount of oxygen required to produce 1,000 cubic meters of useful gas； Coal consumption per unit refers to the amount of coal required to produce 1,000 cubic meters of useful gas ； Cold gas efficiency refers to the ratio of the heat released upon combustion of the produced syngas to the heat released upon combustion of the feed coal ； Total energy consumption refers to the sum of all materials and energies required to produce one ton of product; it can also be called cost accounting ； 2. The oxygen consumption in the single-nozzle water-coal slurry gasification process is generally around 550 Nm/m3, while the coal consumption is about 330 kg/m3; the four-nozzle version has slightly lower values. The dry powder coal gasification process exhibits even lower oxygen consumption.

The values for specific oxygen consumption and specific coal consumption on the floor above are reversed!

Let’s discuss in more detail the specific values of these indicators for various types of furnaces

How are specific oxygen consumption and specific coal consumption calculated?

Oxygen consumption ratio: The amount of oxygen required to produce 1000 Nm3 of (CO+H2), expressed in Nm3/1000 Nm3 (CO+H2). Coal consumption ratio: The amount of dry coal required to produce 1000 Nm3 of (CO+H2), expressed in Kg/1000 Nm3 (CO+H2). Relying solely on these indicators does not allow for an accurate assessment of the differences between various gasification technologies, and it may even lead to misunderstandings. For example, the coal and oxygen consumption in dry powder gasification is lower than that in slurry coal gasification; based on this, some people simply conclude that dry powder gasification is superior to slurry coal gasification. Theoretically, dry powder gasification has advantages over coal water slurry gasification; in coal water slurry gasification, coal reacts with water and oxygen, and part of the coal must react with oxygen to generate heat that is used to vaporize water into steam ； Dry powder gasification involves the reaction of coal with steam and oxygen; therefore, oxygen and coal consumption must be low. However, the steam used comes from boilers that burn coal, and there are heat losses during the conversion of coal into steam. Additionally, a large amount of heat is required to dry the coal powder. Steam is also needed for the shift reactions involved in the production of methanol and synthetic ammonia. Based on current theories, the gasification technology with the best energy efficiency is one that uses a dry coal pump to feed dry coal along with steam and oxygen into a water-cooled wall gasifier for reaction; the crude syngas is processed through a semi-quenching process involving first discharging it from the reactor and then cooling it, thereby ensuring the water-to-gas ratio required for the shift reaction. The dry coal transported by dry coal pumps can currently contain a higher level of moisture; the allowable moisture content is much higher than that for conventional dry powder gasification, which helps to reduce the fuel required for drying the coal ； The water-cooled wall gasifier can generate steam as a by-product, and the waste boiler also produces steam, allowing for efficient heat recovery ； Quenched gas eliminates vulnerable components such as high-temperature ceramic filters, thereby improving the operational reliability of conventional dry coal powder gasification technology. This integrated technology should be the future development direction of gasification technology.

The last edit to this post was made by the wedding night on 2011-8-9 at 15:29. The concepts explained in the second floor comment are comprehensive and accurate; it’s not easy to explain basic concepts so clearly, huh. The views expressed on the eighth floor are also reasonable – gasification technology needs to be integrated organically with the further processing of specific products and the structure of the industrial chain in order to achieve optimal results and to leverage the advantages of different gasification techniques. Of course, this requires appropriate coal as a foundation; otherwise, it’s all just talk

I believe that the term \"content of effective gas\" mentioned in the concept of cold gas efficiency is incorrect; it’s wrong, as it doesn’t refer solely to effective gas – it also includes other combustible gases.

What is the relationship with oxygen consumption levels?