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Jan 23, 2013

Steam boilers for textile:

Steam boilers for textile:

Textile industry is suffering from energy crisis specially Gas, Low pressure and high demand among residence in winter causes complete breakdown. So, it’s high requirement to shift on alternate energy resources e.g. Coal. Country is very rich with its coal reserves and it can serve for quite long. In this post we will discuss possible energy alternates for textile industry, Economical aspect (Costing), Merits and demerits involved. Major focus is on costing to evaluate efficiency of different energy resources.
Industry utilizes different kind of boilers with varying pressure and of different capacities as per unit requirement.

Coal is being burnt down to provide heat Energy for boiler

Case Study:

Let’s assume a boiler working at pressure 5Bar and producing steam of Two Tons per hour. Efficiency of this boiler is approx. 80%.
What would be cost of producing 2Tons of steam per hour on Natural Gas, Coal and Furnace Oil?
Our solution to this scenario is a simple formula which says:

Efficiency(n) =   Output      Quantityof Steam(Qs)     X             Energy in Steam(hf)
                          Input       Qt of Fuel (Qf) X Gross Cal. Val. (GCV) X Sp. Gravity of fuel

Omitting Specific Gravity of fuels to simplify and Shifting variables of formula from here to there and vice versa. So, that Final shape becomes.

Qf =       Qs           X             hf
                GCV       X             n

So, Here what these are

Qf = Quantity of fuel needed to produce 2Tons steam per hour at 5 Bar
Qs = Qunatity of steam. This is fixed value 2000Kg per hour
Hf = Enthalpy of evaporation which is Fix Value taken from Steam table,2757KJ/Kg of Steam.(Means One Kilogram of steam has this much energy at Pressure 5 Bar)
GCV = Gross caloric value, Different for each combustible material.
N = Efficiency of Boiler, Fixed quantity taken as 80%, we will put 0.8 in formula.

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