Carbon residue content in space furnaces?
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This post was last edited by lflsedin on 2016-1-10 at 06:58. Our facility uses space heating furnaces, which have been in operation for over a year now. We have a question: the fixed carbon content in the raw coal is around 52%, while the carbon content in the fine residue from the filter is about 42%. The carbon content in the coarse residue varies between 5% and 60%. These values can generally be considered as the annual averages. . . Is this test result correct?
It can be considered normal if the carbon residue in the filter cake is less than 50% and the carbon residue in the slag is less than 10%. However, the value of slag carbon residue generally has a strong relationship with the operation status of the gasification furnace, so significant variations are also normal
The amount of residual carbon is too high; it seems that the space furnace isn’t yet fully developed, as the efficiency of coal utilization is very low. Check the residual carbon content in the coarse and fine slag from multiple nozzles! Fine slag CA0806B 12.62 Fine slag CA0806B 17.33 Fine slag CA0806B 12.00 Fine slag CA0806B 13.08 Fine slag CA0806B 12.39 Fine slag CA0806A 11.29 Fine slag CA0806B 12.58 Fine slag CA0806B 12.35 Fine slag CA0806A 14.50 Fine slag CA0806B 16.96 Fine slag CA0806A 12.08 Fine slag CA0806A 13.84 Fine slag CA0806A 16.73 Fine slag CA0806A 25.75 Fine slag CA0806A 18.19 Fine slag CA0806A 17.51 Fine slag CA0806A 14.50 Fine slag CA0806A 17.58 Fine slag CA0806A 15.86 Fine slag CA0806A 19.42 Coarse slag CA0703C 5.30 Coarse slag CA0703A 3.32 Coarse slag CA0703C 1.40 Coarse slag CA0703B 1.48 Coarse slag CA0703A 0.01 Coarse slag CA0703B 0.19 Coarse slag CA0703B 0.01 Coarse slag CA0703B 0.46 Coarse slag CA0703B 0.85 Coarse slag CA0703A 0.01 Coarse slag CA0703B 0.26 Coarse slag CA0703B 0.01 Coarse slag CA0703B 0.01 Coarse slag CA0703A 0.10 Coarse slag CA0703A 0.01 Coarse slag CA0703A 0.01 Coarse slag CA0703A 0.01 Coarse slag CA0703A 1.60 Coarse slag CA0703B 0.01 Coarse slag CA0703B 0.01 Coarse slag CA0703A 0.01 Coarse slag CA0703B 2.51 Coarse slag CA0703A 1.20
May I ask if your company has set any standards for the content of fine residue and carbon in this filter cake? We require that the residue carbon content be ≤40%, with the monthly pass rate to be kept at 80%, but I wasn’t able to meet these requirements in any single month throughout 2015
If this result doesn’t indicate any problems, then it’s really poor! The total carbon conversion rate is at most over 80%! What is the ash-to-slag ratio?
These data are fairly normal. Could you provide the coal quality analysis results?
The fine slag index is less than 50%; aside from periods of startup/shutdown and times when furnace conditions fluctuate significantly, this index can be achieved during normal production operations
These are the measurement data on a wet basis, right?
This data has changed my perspective; companies like Shell are far behind
This is mainly related to the arrangement of the burners, the flow field within the gasification furnace, and the control of the oxygen-to-coal ratio. Based on most of the operational space gasification units, the data provided by the original poster is correct
For the coarse slag and residual carbon from space furnaces, the value is generally between 3 and 4, while the fine ash content should be below 40