Chimney Height Calculation

do we really have to solve problems even if they do not exist?

standard chimney design, i would suggest you understand all flu gas chimney design and why that design, then move from that premise.

amount of exhaust gas/second,pressure or gravity feed system? that will determine the diametre of your chimney, while you want to discharge it to the furthest point, for health and environmental issues that will determine you height.

remember-intellectuals solve problems,geniuses prevent them.

I do think that bridge height will impose a critical factor. Don't forget the tides will affect things, too. You should also consult with your neighbors and the regulations they impose on you. Come to think of it, terrain may also have an affect. More to the point, have you tried thinking?

That is the job of your Boiler Supplier as part of his supply. If you are supposed to locally fabricate then he should specify the material/thickness/dia/height and drawings.

Please check with your boiler supplier or read its manuals . Also consult the local codes for environmental control.

In the UK. you would need to consult your "SAFE" Gas installer. I hope, as you have the good sense to ask the question, then you will follow the next logical step and call in a professional.

If you're not in the UK...... same applies!

Dear Friend,

The area for chimney depends upon the volume of Flue Gas to be dumped in the Atmosphere. Quantity of flue gas can be derived in terms of Kgs/Sec. and based on the Flue Gas Temperature, the Volume can be calculated, and add 10% margin on this value. Velocity is known and hence the area can be calculated.

For Baggasse fired Boiler, the Theoritical air required is 5.76 Kgs/Kg. of Baggasse with 50% Misture. The Modern Sugar Factory has 35% Excess Air. Hence it is easy to calculate the Chimney Area.

Regarding the HEIGHT of the CHIMNEY, it is governed by 2 Factors. One Factor is based on the Pollution Control Authorities' Guide Line and the other Factor is, to strike an optimum balance between COST of CHIMNEY and POWER SAVED, due to additional creation of Draught. This is very important where Export of Surplus Power to Grid or sale to a customer.

It is very well known to all Engineers that - more the HIEGHT of the CHIMNEY, HIGHER is the DRAUGHT created.

Now the current Trend for the Baggasse fired Boiler is to use a height of 110 to 120 Metres, where as actual required will be about 55 Metres + the Margin fixed by Pollution Control Authorities which is around 10 to 15 Metres.

THANKS,

DHAYANANDHAN.S

The local Planning Authority may issue upper limits dependent on the location.

• Height is an issue in the approaches to airport runways, for example.

But what about a chimney for a submarine?