4 replies to this topic

[tanyongboon1]

Heat recovery is a key focus of chemical plants nowadays. When executed well, heat recovery projects can increase the plant's energy efficiency and reduce the plant's emissions. I was looking at the use of cooling water in some of our overhead condensers. Using cooling water to cool the overhead vapours effectively wastes the heat from those vapours. If we could, for example, integrate the overhead condenser with a heat pump to preheat reactor/column feed, then the heat from the condensation can be better utilised. Is this a sensible idea? 

 

I am also looking for more ideas on heat recovery and heat integration in a process plant. I think at this point, many of the easy-to-see, low-hanging fruits have already been considered and implemented if they are feasible. There is a need to think of slightly more unconventional ideas or to implement new technology. Thank you!

[breizh]

Hi,

An example of heat recovery.

Note: I believe your example about cooling water is not viable, cooling water is not quality water and will lead to deposit and for sure trouble. You need to understand the chemistry of water.

Good luck 

Breizh

Attached Files

•  cain_boiler_economizer.ppt   7.5MB   5 downloads

[tanyongboon1]

Thank you breizh! I will look into the economiser you have shared. I did not know an economiser could be so cheap. We once looked into an economiser that uses heat from flue gas to preheat boiler feed water... But the cost of the ducting was ridiculously expensive. Hence, the ideas was scrapped. I will look into this economiser you have suggested, which seems far cheaper and more economical than what we considered previously. 

 

Hi,

An example of heat recovery.

Note: I believe your example about cooling water is not viable, cooling water is not quality water and will lead to deposit and for sure trouble. You need to understand the chemistry of water.

Good luck 

Breizh

[tanyongboon1]

Actually, what I meant in my first post was something like the diagram in the ppt slides I have attached. It tries to utilise the heat from condensation in the overhead condenser to heat up the bottoms of the column in the reboiler. However, this cannot be implemented when the delta T of the column is large, i.e. > 45 degrees C.

 

Attached Files

•  Picture of heat pump integrated distillation column.pptx   77.61KB   14 downloads

Edited by tanyongboon1, 30 November 2024 - 08:31 PM.

[breizh]

Hi,

https://www.chemengg...p-distillation/

 

Consider the link above and the example.

A lot of similarity with the MVR for evaporators.

Breizh

Attached Files

•  GEA_Evaporation-Technology-Using-Mechanical-Vapour-Recompression_brochure_EN_tcm11-22946.pdf   1.91MB   5 downloads