Coal blends, foundry coke products, and associated systems, devices, and methods
Coal blends used to produce foundry coke products are disclosed herein. Coal blends can include first coals having a first volatile matter mass fraction less than or equal to a first threshold, and second coals having a second volatile mass fraction greater than or equal to a second threshold that is less than the second threshold. The coal blend can have an ash fusion temperature less than 2600° F. and an aggregated volatile matter mass fraction between 15% and 25%.
1. A coal blend, comprising:
first coals having a first volatile matter mass fraction less than or equal to a first threshold; and
second coals having a second volatile matter mass fraction greater than or equal to a second threshold,
wherein:
the first threshold is less than the second threshold by at least 4.0%;
an ash fusion temperature of the coal blend is less than 2600° F.; and
the coal blend has an aggregated volatile matter mass fraction between 15% and 25%.
2. The coal blend of claim 1 , wherein the coal blend does not comprise any coals having a volatile mass fraction greater than the first threshold and less than the second threshold.
3. The coal blend of claim 1 , wherein the coal blend comprises only the first coals and the second coals.
4. The coal blend of claim 1 , wherein the first threshold is less than 21.0% and the second threshold is greater than 25.0%.
5. The coal blend of claim 1 , wherein an ash fusion temperature of the coal blend is no more than 2450° F.
6. The coal blend of claim 1 , further comprising coke breeze.
7. The coal blend of claim 6 , wherein the coke breeze comprises 1-20% of the coal blend.
8. The coal blend of claim 6 , wherein no more than 5.0% of the coke breeze is characterized as a 10 mesh coke breeze or larger.
9. The coal blend of claim 1 , wherein:
the first coals are greater than or equal to 60% of the coal blend; and
the second coals are greater than or equal to 15% of the coal blend.
10. The coal blend of claim 1 , wherein:
the first coals are greater than or equal to 15% of the coal blend; and
the second coals are greater than or equal to 60% of the coal blend.
11. The coal blend of claim 1 , wherein at least one of a calcium oxide mass fraction, a lime mass fraction, a trona mass fraction, a soda ash mass fraction, a caustic soda mass fraction, a low ash fusion slag mass fraction, a basic oxygen furnace (BOF) slag mass fraction, a cupola slag mass fraction, an iron mass fraction, a nickel mass fraction, a potassium mass fraction, a magnesium mass fraction, a sodium mass fraction, a calcium sulfate mass fraction, a rockwool mass fraction, or a biomass mass fraction of the coal blend is less than 5.0% of the coal blend.
12. The coal blend of claim 1 , wherein an ash mass fraction of the coal blend is greater than 10.0%.
13. The coal blend of claim 1 , wherein a fluidity of the coal blend is at least 100 dial divisions per minute (ddpm).
14. The coal blend of claim 1 , further comprising third coals having a third volatile matter mass fraction less than or equal to the first threshold.
15. The coal blend of claim 1 , wherein the first coals have a V16 vitrinite mass fraction that is greater than 25%.
16. The coal blend of claim 1 , wherein a sum of a V8 vitrinite fraction, a V9 vitrinite fraction, and a V10 vitrinite fraction of the second coals is greater than 40%.
17. The coal blend of claim 1 , wherein a sulfur mass weight fraction of the coal blend is at least 5.0% and/or a calcium weight fraction of the coal blend is at least 5.0%.
18. The coal blend of claim 1 , wherein:
the first coals comprise a V8 vitrinite fraction, a V9 vitrinite fraction, a V10 vitrinite fraction, and a V11 vitrinite fraction,
a sum of the V8 vitrinite fraction, the V9 vitrinite fraction, the V10 vitrinite fraction, and the V11 vitrinite fraction is greater than 50%,
the second coals comprise a V14 vitrinite fraction, a V15 vitrinite fraction, a V16 vitrinite fraction, a V17 vitrinite fraction, and a V18 vitrinite fraction, and
a sum of the V14 vitrinite fraction, the V15 vitrinite fraction, the V16 vitrinite fraction, the V17 vitrinite fraction, and the V18 vitrinite fraction is greater than 50%.
19. A coal blend, comprising:
first coals having a first volatile matter mass fraction less than or equal to a first threshold; and
second coals having a second volatile matter mass fraction greater than or equal to a second threshold,
wherein:
the first threshold is less than 21.0%;
the second threshold is greater than 25.0%; and
an ash fusion temperature of the coal blend is less than 2600° F.
20. The coal blend of claim 19 , further comprising third coals having a third volatile matter mass fraction less than or equal to the first threshold, wherein the first coals and third coals each comprise V14 vitrinite, V15 vitrinite, V16 vitrinite, and V17 vitrinite.
21. The coal blend of claim 19 , wherein:
the first coals comprise V14 vitrinite, V15 vitrinite, and V16 vitrinite;
a fraction of the V16 vitrinite of the first coals is greater than a fraction of the V15 vitrinite of the first coals; and
the fraction of the V15 vitrinite of the first coals is greater than a fraction of the V14 vitrinite of the first coals.
22. The coal blend of claim 19 , wherein a difference between the first threshold and the second threshold is greater than 10%.
23. A method of determining a coal blend for coke product production comprising:
obtaining a plurality of coal parameters of first coals and second coals, wherein:
the first coals have a first volatile matter mass fraction less than or equal to a first threshold; and
the second coals have a second volatile matter mass fraction greater than or equal to a second threshold, wherein the first threshold is less than the second threshold by at least 4.0%;
determining a plurality of coke product parameters based on the plurality of coal parameters; and
based on the plurality of coke product parameters, determining a coal blend formulation for a coal blend comprising a combination of the first coals and the second coals.
24. The method of claim 23 , further comprising obtaining breeze parameters for coke breeze, wherein:
the breeze parameters indicate at least one of a breeze volatile matter mass fraction, a breeze ash mass fraction, or a breeze sulfur mass fraction; and
determining the coal blend formulation comprises determining an amount of coke breeze to add to the coal blend based on the breeze parameters.
25. The method of claim 23 , wherein the first threshold is less than 21.0%, and wherein the second threshold is greater than 28.0%.