How much coal tar is actually produced as a by-product in the coal gasification process? What is the annual production volume?
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Coal tar is produced during the carbonization and gasification of coal. It is easy to understand why coal tar is generated during carbonization, and this is also the main source of coal tar in the market. But in current coal gasification processes, the temperatures in both fluidized bed and gasized bed systems are above 1000 degrees Celsius, allowing the coal tar to be completely broken down; in other words, virtually no coal tar is produced. In fixed-bed reactors with a lower gasification temperature, there is a large amount of coal tar, and its useful components can be recovered. So, how much coal tar is actually produced each year as a result of the coal gasification process? Which sea friend can provide it? Thank you
It can be roughly calculated based on the volatiles in coal.
I’d like to know that too. Is there anyone who can offer some guidance?
Are there any experienced formulas? Thank you.
Among the three coal gasification furnace technologies, only the fixed-bed type produces tar. Tar is not a simple substance; it is a mixture of various hydrocarbon compounds. Different coal types yield different amounts of tar, and the amount of tar produced mainly depends on the volatile matter content in the coal. To obtain an accurate tar production figure, consult the material balance sheet in the process package to check for the tar content in the components of the gas stream at the outlet of the gasifier; that CnHm substance is the tar.
You want to know about the raw materials for coal tar, right? Coal tar is divided into high-temperature coal tar and medium-low temperature coal tar. High-temperature coal tar comes from coking plants; you need to research the production capacity and layout of the coking industry. However, this type of coal tar is not suitable for hydrogenation treatment – you could consider subjecting the separated anthracene oil to hydrogenation instead ； Some medium- and low-temperature coal tar is produced as a by-product of Lu Odd moving-bed gasification; however, moving-bed gasification is no longer the mainstream method, so few new projects of this type are being established (there are some new coal-to-gas projects), with most of the existing facilities being old ones. Another source of such tar is the production of semi-coke; new projects mainly focus on the differentiated utilization of coal and its upgrading through pyrolysis. To conduct this research, it is necessary to consult a large amount of project documentation; it cannot be calculated using simple formulas.
However, if you are planning to set up a new project on your own and have a specific coal type in mind, industrial analysis, elemental analysis, and the Kekulé distillation test are generally carried out on the coal; the Kekulé distillation test provides results regarding the yield of coal tar.
This post was last edited by shuker666 on 2019-7-1 15:50. It’s a very old post; I’ll answer it: There are three ways in which coal tar is produced: 1. The coking industry (high-temperature coal tar)； 2. Luchi process (medium- and low-temperature coal tar) ； 3. Improved utilization of coal (medium- and low-temperature coal tar) ； The production of coal tar depends mainly on the technical processes and the quality of the coal ； Taking the Lurgi process as an example: the Tard% index of coal represents the tar content in the coal on a dry basis; the theoretically calculated amount of tar = amount of raw coal * Tard% index ； Actual tar production (medium oil and light oil) = Theoretical tar amount * Tar recovery rate coefficient (Lurgi ≈ 75% while BGL ≈ 65%; these values are empirical) ； In fluidized bed gasification (water-coal slurry, dry powder coal gasification), the gasification temperature is above 1200°C, which decomposes all the tar (volatile components) in the coal into useful gases (CO + H2).