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CASE STUDY |
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Waste heat source |
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Engine generator
exhaust |
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Capacity of
Engines |
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1 MW x 1 No. |
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Fuel fired in
Engines |
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Natural Gas |
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Total flue gas
quantity |
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4780 kg/hr |
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Flue gas inlet
temperature |
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598 Deg.C |
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System
configuration |
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Main waste heat
recovery boiler + fired zone + Eco. |
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N.G. Firing in
fired zone |
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60 SM3
/ hr |
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Flue gas outlet
temperature |
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205 Deg.C |
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Output type |
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Steam at 10 bar(g) |
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Output at 100%
load |
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2000 kg/hr. (F & A
100 Deg.C) |
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Product Details |
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Type |
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Smoke tube,
composite (I.e. unfired plus fired zone) |
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Installation |
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Horizontal /
Vertical, Indoor |
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Tube Orientation |
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Horizontal /
Vertical |
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Waste gas flow
direction |
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Horizontal /
Vertical (upwards & downwards) |
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Quality of waste
gases |
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Low dust level
desired |
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Type of heat
recovery output |
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1) Steam - D & S /
Superheat
2) Hot water,
3) Vapor phase
thermic fluid heating. |
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Media of waste
heat |
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Hot gases, Hot
vapors, Hot liquids |
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Steam pressure |
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Suitable for low
as well as medium pressure |
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Steam condition |
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Dry & saturated
and also superheated steam through provision of
super-heater. |
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Water side
circulation |
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Natural
circulation internal to boiler |
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Steam separation |
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In steam drum or
in external moisture separator |
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Waste heat source
suitability |
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Fuel cell exhaust,
micro / min gas turbine exhaust, small gas turbine exhaust,
DG set exhaust, process waste gases incinerator exhaust,
furnace exhaust, gas turbine exhaust. |
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Typical
applications |
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Where heat
recovery from waste heat needs to be supplemented with fuel
firing and installation of two separate boilers unfired and
fired has space limitation. |
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Supplementary
firing possibilities |
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Firing in internal
furnace provided in boilers. |
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Output capacity
possibilities |
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Typically upto
20T/hr capacity. |
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Soot removal |
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By sonic soot
blowers and through self cleaning velocities |
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Number of heat
recovery stages possible |
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3 to 4 stages of
heat recovery possible e.g. Superheater evaporator,
economizer, water preheater |
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Typical lowest
exhaust gas temperature at final outlet of system |
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Gases generated by
diesel - 130 Deg.C, Gas generated by Natural Gas - 110 Deg.C,
Gases generated by high sulphur fuels - 150 Deg.C |
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Protection against
sulphur corrosion on cold end side |
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Provided by
various means to ensure that metal temperature in maintained
above the actual incipient limit. |
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Flow Diagram
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