|
|
| Crystallizer heated by MVR |
|
|
Descriptions |
Unit |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
Medium |
|
Feed |
Solution |
Solution |
Slurry |
Vapor |
Vapor |
Purge |
| Total mass flow rate |
kg/h |
147,000 |
4,273,000 |
4,420,000 |
106,000 |
36,220 |
38,230 |
4,780 |
- (NH 4 ) 2 SO 4 |
kg/h |
66,100 |
2,018,000 |
2,084,100 |
63,800 |
|
|
2250 |
- Organics |
kg/h |
6,000 |
303,000 |
309,000 |
5,700 |
|
|
340 |
- Water |
kg/h |
74,900 |
1,952,000 |
2,026,900 |
36,500 |
36,220 |
38,230 |
2,190 |
(NH 4 ) 2 SO 4 content |
wt% |
45.0 |
47.2 |
47.2 |
60.2 |
|
|
|
| Density |
㎏/㎥ |
1,220 |
1,230 |
1,230 |
1,350 |
|
|
1,230 |
Steam |
kg/h |
|
- |
|
|
|
|
MVR motor power |
KWh |
|
|
|
|
1,200 |
|
|
MVR is often used for the evaporative crystallization of organic and inorganic solute. Either forced circulation or draft tube & buffle crystallizer has forced circulation heating body to increase the saturated solution temperature to obtain a super saturation after flash evaporation.
The flash evaporated solvent is adiabatically compressed by turbo fan type MVR to elevate temperature to avail the required heat transfer rate in the heat exchanger.
Depending on boiling point rise of the solution, which is generally lower with organic than inorganic solution, 1∼3 stage turbo fan would be installed in series to get 8∼25 ℃ temperature elevation. |
|
| |
|
