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Which statement is NOT true for fixed drum type biogas power plant?
It has no corrosion problem.
The gas production per cubic metre of digester is less.
It has a lower cost.
It has constant pressure of biogas.
It has constant pressure of biogas.
In a fixed-dome (fixed drum) biogas plant, the gas is stored in the upper portion of the digester, which has a fixed volume. As the amount of gas produced increases, the pressure inside the dome rises, meaning it does not maintain a constant pressure, unlike floating drum models.
IS 16086:2013
In a fixed-dome (fixed drum) biogas plant, the gas is stored in the upper portion of the digester, which has a fixed volume. As the amount of gas produced increases, the pressure inside the dome rises, meaning it does not maintain a constant pressure, unlike floating drum models.
PgasтАЛ=PatmтАЛ+╧Бgh
VstorageтАЛ=Constant
The principle relies on the displacement of slurry. When gas production increases, the biogas pushes the slurry out of the digester into the compensation tank. Since the gas storage space is fixed and the pressure varies with the volume of stored gas and the weight of the displaced slurry, it cannot achieve the constant pressure characteristic of floating drum designs.
Fixed-dome plants are constructed primarily of brick or concrete.
The gas pressure is variable and depends on the depth of the gas holder.
These plants are generally cheaper to construct due to the lack of moving steel parts.
Corrosion is significantly reduced as there are no metal gas holders exposed to wet H2S gas.
Lower capital cost
No moving parts
Long service life
No corrosion of metal components
Variable gas pressure
Prone to gas leakage through cracks in the dome
Difficult to repair
Gas production per unit volume is lower compared to floating drum plants
Rural agricultural settings
Small-scale domestic household energy supply
| Feature | Fixed Dome | Floating Drum |
|---|---|---|
Pressure Type | Variable | Constant |
The floating drum design utilizes a moving metal gas holder that maintains constant pressure via weight.
Option D is incorrect because the pressure is strictly variable based on the slurry displacement level.
D is correct тАФ The fixed dome biogas plant operates with variable gas pressure rather than constant pressure.
Remember that floating drum designs (KVIC model) are associated with constant pressure, while fixed dome designs (Janata model) are associated with variable pressure.
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