We have a Ball mill, the average moisture of the mix is ca 4-5% but during strong raining season it comes up to 8%!
Hot gas coming from the kiln is not enough to dry the material, we have also installed a hot gas generator (HGG) to use in case of kiln shutdown.
My question:
Is it safe to try to run with both kiln hot gas and hot gas coming from the HGG?
HGG and kiln hot gas are connected to the same duct.
Thanks in advanced!
The only problem I can see is to ensure that enough air can be drafted through your hot gas generator.
You should check the mill fan to be sure it can take both gas from kiln and from HGG.
Gas repartition may also be a concern (i.e how to determnie what amount will be taken from HGG and what amount from kiln). This depends on the specificities of your gas circuit (flaps, booster fans, etc...)
Depending on your preheater arrangement there may be the possibility to operate a 5-stage preheater during the dry season and a 4-stage preheater during the wet season by feeding the raw meal to the riser of the lower preheater stage resulting in higher preheater off-gas temeperature.
This would reduce the capital cost for installing a hot gas generator.
This way operation is done in some cement plants.
Best regards,
WiZi
Dear Sir,
To some extend I agree with the idea expressed by Mr. Wizi by draw hot gases operating 5 stage PH in normal days and from 4th stage PH during rains.
However to comment more realistic concern are requested better to put the problem in totality along with basic plant set up like 5stage or 4 stage PH and plant capcity etc.
Regards
R P Soni