Stefan2211
Chemical
- Jun 25, 2020
- 104
Dear All,
We have a by-product in our TDAE plant, which needs to be cooled down from 180 Deg C (7.4 cP) to 115 Deg C (107 cP) by means of water. The flow rate is 11,000 kg/h. Our EPC contractor provided a welded plate heat exchanger with 27 m3 heating surface. This plate hx was basically damaged beyond repair during an operational incident, where carbonized solids from process were circulated, which lead to blockage and shut down. The fluid became solid and could not be liquified anymore by means of steam (too many coke solids in the plates). Now we are thinking of replacing the plate type with a shell and tube single pass hx in vertical design (fluid in tubes - water in shell). What would be the recommended min tube diameter for easy cleaning?
In other section where we heat up the fluids we use 25.4 x 2 mm tubes in either SS or carbon steel but mech. cleaning besides hydro jetting (15,000 PSI) is not practical (manual brushing).
Does anyone have experience with such asphalt like fluids? We are thinking of using 42.2 x 3.56 mm (DN32) for easier use of rotating brushes etc.
Thanks in advance
We have a by-product in our TDAE plant, which needs to be cooled down from 180 Deg C (7.4 cP) to 115 Deg C (107 cP) by means of water. The flow rate is 11,000 kg/h. Our EPC contractor provided a welded plate heat exchanger with 27 m3 heating surface. This plate hx was basically damaged beyond repair during an operational incident, where carbonized solids from process were circulated, which lead to blockage and shut down. The fluid became solid and could not be liquified anymore by means of steam (too many coke solids in the plates). Now we are thinking of replacing the plate type with a shell and tube single pass hx in vertical design (fluid in tubes - water in shell). What would be the recommended min tube diameter for easy cleaning?
In other section where we heat up the fluids we use 25.4 x 2 mm tubes in either SS or carbon steel but mech. cleaning besides hydro jetting (15,000 PSI) is not practical (manual brushing).
Does anyone have experience with such asphalt like fluids? We are thinking of using 42.2 x 3.56 mm (DN32) for easier use of rotating brushes etc.
Thanks in advance