fjalali:

Can the sulfur in the fuel source be at a level that results in such sulfur level in the clinker? Should the alkalis always be (1.55 x Alkali in raw feed)?

Hello Fjalali,

No, the value of 1.55 that I quoted above for the Raw meal to Clinker Ratio is not a constant, it varies from plant to plant, but is most often around 1.55. This means that 1.55 tonnes of raw meal will produce 1 tonne of clinker, due to calcination (loss of CO2).

In a natural gas fired plant, with no alkali bypass, the clinker composition can be estimated by multiplying the raw meal composition by the Raw meal to Clinker Ratio.

When we apply this typical ratio to the raw feed data you initially provided, there are several discrepancies which cannot be easily explained, if we take the data at face value. eg;-

1. The SO3 content of the clinker appears far too high for the raw meal input.

2. The Na2O and K2O of the clinker are both too low for the raw meal input. (In fact, the Na2O of the raw meal is even smaller than that of  the clinker. This is impossible, unless you are losing a lot of Na2O via a bypass system.)

The only explanation I can come up with is that there is some error in either the raw meal or the clinker analyses. They just don't balance!

Regards,

Ted.

calahan:

As your fomular, i tried to calculae the SO3 absorbed into the Clinker. The analyses (bases on X-ray) is normally more than the calculated result:

  0.49 (analyses result) > 1.55*0.21 (from kilnfeed) = 0.33 (calculated result)

 This is statistics result within 1 week.

Could you explain by clearly, pls?? Thanks!!

Hello Calahan,

Firstly, are you using gas firing or coal firing? If you are using coal, you will have to take the sulphur content of the coal into consideration because virtually all of the sulphur in the coal coal will report to the clinker.

Secondly, do you have any other inputs to your kiln (fuels or waste streams) which contain sulphur?

Thirdly, what is the Loss On Ignition of your kiln feed and does it include recirculation dust? (if so, what percentage dust?)

Regards,

Ted.

Hi,

Thanks for your help.

I agree that the result of the analysis those not make sense. I will ask for more tests.

Regards;

Faramarz

Dear Mr.Ted

        Thanks for your informations! I calculated and realize a higher SO3 absorbed into clinker when using the 3c-coal instead of 3b-coal with the same quality of kilnfeed :

          The 3b-coal : SO3 2.0 - 2.4, Calorific 7100

          The 3c-coal : SO3 1.5 - 1.7, calorific 6800

      So it is a contradiction, isn't it??