Differentiate between water tube boiler and fire tube boiler
Fire tube boiler
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Water tube boiler
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In Fire-tube boilers hot flue gases pass through tubes and water surrounds them.
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In Water-tube boilers water passes through tubes and hot flue gasses surround them.
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These are operated at low pressures up to 20 bar
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The working pressure is high enough, up to 250 bar in super critical boilers.
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The rate of steam generation and quality of steam are very low, therefore, not suitable for power generation.
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The rate of steam generation and quality of steam are better and suitable for power generation.
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It requires more floor area for a given output.
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It requires less floor area for a given output
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Load fluctuations cannot be handled.
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Load fluctuations can be easily handled.
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In Fire-tube boilers hot flue gases pass through tubes and water surrounds them.
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In Water-tube boilers water passes through tubes and hot flue gasses surround them.
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