138 posts
re RSP: High Calcination degree
Silastman,
Your short explanation is very clear, thank you for that.
Thank you also for attaching your paper here.
Your paper is interresting.
I am curious to read it in more detail and learn how the internal state of the raw meal is modified by compression. It is somewhat a surprise for me that this mechanical effect could by so large. Have you measured the energy consumption of the press, the resulting
specific energy consumption of raw meal compression, and the efficiency of the process (with repect to the calcination heat economy)?
However, I must also stress that raw meal compression will not decrease the energy consumption of a cement plant. As seen from the cement plant manager point of view, the initial state of the raw meal is still the uncompressed state. By applying the first principle, the plant manager will have to supply and pay the energy needed for compression and the total theoretical energy requirement will remain the same. The final effect will actually depend on the efficiency of the compression process compared to the efficiency of the calcination process. From a cost point of view, it is very likely that the compression process will be very expensive since it will use electrical power and I also expect its efficiency to be low. The same will be true for the CO2 emissions, if the power is procuced from fossil fuels.
lal
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23 posts
re RSP: High Calcination degree
However, calcination process in the pre-calciner is taken place rapidly within several seconds, which is less enough time to decarbonate high surface-area particles and consequenltly resulting in low calcination performance
Emad
84 posts
re RSP: High Calcination degree
Dear lalbatros !
You first, who understand this problem. Main method of measuring change energy consumption after pressing is differential thermal analysis - measuring displacement temperature of endothermic effect, or square of endothermic effect (case of decarbonization). You absolutely correct, that in condition of cement plant, real consumption of energy may be more of teoretical. I calculate teoretical heat balance.
84 posts
re RSP: High Calcination degree
When used for pressing the model industrial press pressures up to 200 MPA pressing specific consumption of electricity per ton of raw mix is increasing at an annual average rate of 4.5 -5 kWh/t which is equivalent to 18000 kJ per ton of raw mix or 27056 kJ per tonne of clinker. When the temperature of clincermaking decrease on 150 oC, according to X. Taylor, saving energy costs per tonne of cement is 105000 kJ/t. Saved 10% energy intensity per decarbonization raw mix equal 107580 kJ per tonne of clinker, total balance energy savings will be +107580 – 27056 +105000 =185000 kJ/t. Theoretical heat required for the implementation of the chemical reactions is 1807000 kJ per ton of clinker.Total savings amounted to 10.23%.