Chemical result of burning rice straw

@aj-onduty-BvuwMK • Oct 27, 2024

Oct 27, 2024

963

I was wondering what all problems can be faced in boilers in biomass plants which use rice straw as primary fuel. As I am not sure of the chemical reactions(read it as weak in chemistry), I request chemical engineers to share their views on this question. The boiler temperature is about 550deg centigrade. I also was successful in finding out the chemical composition of rice straw. What I got is as follows-
Fixed carbon-15.86%
Volatile matter-65.47%
Ash-18.67%
Composition of ash--
SiO2=74.67%
CaO-3.01%
MgO-1.75%
Na2O-0.96%
K2O=12.3%
I also read somewhere that rice straw has 0.12% of sulfur(I am not sure of that)
Kindly let me know the consequences of using rice straw in a boiler. Thank you for your efforts.

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Voltaire

@voltaire-4MxWke • Sep 7, 2010

Hi Ajit
I think the biggest problems will be fly ash and soot. If it was my decision I would try it anyway. The sulfur seems a bit high and I think the analysis may be inaccurate.
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aj_onduty

@aj-onduty-BvuwMK • Sep 7, 2010

I will be right back wit some more information and I will give you a few more data to chew on and thus answer my query more accurately.
Thank you for your response.
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Ramani Aswath

@ramani-VR4O43 • Apr 3, 2011

aj_onduty
I will be right back wit some more information and I will give you a few more data to chew on and thus answer my query more accurately.
Thank you for your response.
The biggest problem is the large volume of ash. However this is good silica and has a value.
The trouble will be to control suspended particle pollution. You may have to set up an efficient flue gas washer and an ash collection and disposal system.
Bioramani
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aj_onduty

@aj-onduty-BvuwMK • Apr 3, 2011

efficient flue gas washer and an ash collection and disposal system.
These things can be done. But What I was thinking is more innovative way of disposing ash. Not disposing, but using it for something productive. If it can be good enough, can we use this silica to produce glass? or something else? We can make cheaper glass, quality, well, you have to say about it.
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Ramani Aswath

@ramani-VR4O43 • Apr 3, 2011

aj_onduty
Not disposing, but using it for something productive. If it can be good enough, something else? We can make cheaper glass, quality, well, you have to say about it.
Traditionally, tooth powder used to be made using the ash from rice husk. Sand is a far cheaper form of silica. We have to exploit the finer particle size of this ash. It may serve well as a reinforcement in silicone rubber in the place of the more expensive fumed silica used.
Bioramani
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