1156 posts
Control systems Question 1
I've been working with analysers for the cement plants for last nine years and have still a little doubt about the actual use of measurement of NOx in the kiln inlet. If you can kindly send me some literature about the firing in the kiln and the advantages of measuring various gases at the kiln inlet.
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1156 posts
Re: Control systems
The NOx level at the kiln inlet is a very good indication of the burning zone temperature in the kiln. In turn this is one of the most important considerations in the control and optimisation of the kiln. NOx arises from two sources,
(i) organic nitrogen in the fuel, and
(ii) oxidation of the atmospheric nitrogen in the combustion air drawn into the kiln. This oxidation of the atmospheric nitrogen rises in direct proportion to the temperature in the flame and the burning zone.
1156 posts
1156 posts
Re: Control systems
I am sure that your company must have guidelines for this. You need to draw up a list of the attributes you looking for in the system and their importance, i.e. price, capacity, local support capability, etc. Then rank each potential supplier against this list of attributes. The one which scores the best aggregate against the list of attributes will be the best choice.