Pilot-scale coke-making and coke test work is considered the gold standard for simulating the coal to coke transformation that occurs in commercial byproduct coke battery ovens. Unfortunately, the 400 kg sample mass required for a pilot-scale coke test may be difficult to obtain. In these circumstances a small-scale carbonization oven may suffice in providing indicative coke quality results. The small-scale carbonization test requires 10 kg per charge.
The small-scale coke-making process is a follows:
Caveat: The width of the small-scale coke ovens is only 105 mm, compared to an industrial oven with a width of ~500mm. This limits the ability of these ovens to truly simulate industrial practices as a consequence of various heat transfer issues. Thus test-work is often required to benchmark the performance of the small-scale oven with the pilot-scale coke oven.
During preparation of the sample for coke-making, all data is captured by ALS’ in-house laboratory information management system. This system is connected to all balances to ensure a there is a fully visible and auditable process. During coke-making, the oven wall temperatures are controlled by cRIO data management and data logging system controlling 3 solid state thyristors which in turn control 12 SiC elements per oven. Data from the wall and center temperatures, are captured by the cRIO data logging function. During coke testing, all data is again captured by the laboratory information management system. Coke analysis is typically tested as duplicates, with results falling outside standard repeatability limits being re-tested.
Comprehensive coal characterization is typically required on the feed coal. This is typically sub-sampling prior to coke-making and processing the coal through ALS’ extensive laboratory network.
For a process that better simulates the behavior of coke in an industrial coke oven, ALS provides a pilot-scale coke oven which require approximately 400 kg per charge.MORE INFORMATION