Steam Heating Aggregate in a Concrete Plant
Steam Heating Aggregate in a Concrete Plant
(OP)
Hello,
I am asked to estimate the capacity of the boiler that will be used for our concrete plant, I don't know how to approach the problem. The properties are as follows:
Aggregate : 100 m^3/h
Will be heated from -20 C to + 30
Aggregate will be heated in 50 m^3 cells.
Given data is not enough I know, but we can make some assumptions and provide a estimate result.
Some suppliers tell us a capacity of 800 000 cal/h steam will be enough. But I am expected to give the basic steps.
Also where can I get the basics for such a aggregate heating system, I have some other questions such as How much should aggregate wait in a cell to fully develop its temperature.
Any insight and help would be appreciated.
I am asked to estimate the capacity of the boiler that will be used for our concrete plant, I don't know how to approach the problem. The properties are as follows:
Aggregate : 100 m^3/h
Will be heated from -20 C to + 30
Aggregate will be heated in 50 m^3 cells.
Given data is not enough I know, but we can make some assumptions and provide a estimate result.
Some suppliers tell us a capacity of 800 000 cal/h steam will be enough. But I am expected to give the basic steps.
Also where can I get the basics for such a aggregate heating system, I have some other questions such as How much should aggregate wait in a cell to fully develop its temperature.
Any insight and help would be appreciated.





RE: Steam Heating Aggregate in a Concrete Plant
RE: Steam Heating Aggregate in a Concrete Plant
What about transient effects for fully thermal development of aggregate in the cell?
RE: Steam Heating Aggregate in a Concrete Plant
RE: Steam Heating Aggregate in a Concrete Plant
Anyway thanks a lot for the help.
RE: Steam Heating Aggregate in a Concrete Plant
You also have to consider whether or not your aggregate is wet (or contains ice) when you put it in the cell and if it is, account for the amount of heat needed to dry the moisture present.
That would be in addition to simply heating the mass of the rock.
rmw
RE: Steam Heating Aggregate in a Concrete Plant
RE: Steam Heating Aggregate in a Concrete Plant
I can help you to calculate the
amount of steam required but I need the following
info.
1. Weight of material to be heated in lbs/hr or
kg/hr.
2.Operating steam pressure in PSIG or bar.
3.Heat-up Time in minutes.
4.Specific heat of material( if you have)
in Btu/lb F
RE: Steam Heating Aggregate in a Concrete Plant
chicopee heating the water is a good point to consider. Thank you for that tip.
som1973 with some approximations and assumptions we figured out the amount of steam and capacity of boiler needed. Thank you very much anyway.
Thanks for all your efforts. We solved the issue. We calculated the boiler capacity and decided to handle transient effects by trial and error since modeling the system is a very hard problem.