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Ammonia Absorption : Case Studies
CASE 1
 | Petrochemical complex in Western
India. |
| Cooling inlet air to naphtha fired
combined cycle to ISO conditions. |
| Capacity 260 TR at -5oC
evaporation, 0 to 10oC brine. |
| Plant to have flexibility to operate
at 200 TR, -5 to 5oC brine (mode 2). |
| Steam from extraction turbine at
1kg/cm2, or from Benzene condenser (which was earlier using
cooling water). |
| Cooling water supplied at 34oC
owing to temperate, humid conditions. |
| Rigid safety standards to be
followed due to location next to high traffic highway and proximity to
city limits. |
Comparative utility requirement
Comparison is drawn against compressors
that were being considered by the client.
| |
Compressors |
Ammonia
absorption |
|
Electricity |
500 HP
installed, consuming 360 KW. |
50 HP
installed, consuming 30 KW |
| Steam |
Nil |
2,600
kg/h |
Payback / benefits
| Effective cost of power - Rs.5/-
($0.11) per KW. |
| Effective cost of steam - Rs.100/-
($2.20) per ton from turbine (opportunity lost to operate as
condensing turbine) and Nil for steam from Benzene condenser. |
| Effective power saving for 6,000 hrs
per year operation - about 2,000,000 units or Rs.10,000,000/-
($220,000/-). |
| Effective cost of steam -
Rs.1,560,000/- ($34,320/-) or less if partly operated with Benzene
condenser steam. |
| Payback for Ammonia absorption
system - Less than two years. |
| If the cost differential with
compressors is taken, payback would be very attractive at around 6
months. |
CASE 2
| Largest manufacturer of edible oils and
fatty acid derivatives in South India |
| Chilling of vegetable oil fractionation |
| Capacity 80 TR at -15oC evaporation,
-10 to -13oC CaCl2 brine. |
| Rigid safety standards to be followed due to location near
hazardous acetone handling area |
The client was considering compressor systems when we were called in.
Guha's engineers opted to use low cost steam from a nearby husk fired boiler.
Utility requirements
Comparison is drawn against compressors that were being considered by the
client.
| |
Compressors |
Ammonia absorption |
| Electricity |
160 HP installed, consuming 120 KW. |
15 HP installed, consuming 9 KW |
| Heat |
Nil |
800 kg/h steam |
Payback / benefits
| Cost of power - Rs.5/- ($0.11) per KW. |
| Effective cost of heat - Rs. 300/- per
Ton |
| Effective saving for 8,000 hrs per year operation - about
Rs.2,500,000/- ($56,000/-). |
| Payback for Ammonia absorption system - Less than
18 months. |
| If the cost differential with compressors is taken, payback would be very
attractive at around 6 months. |
  
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