Objective:
Design the De-Duster such that it can capture & separate up to 90% of clinker dust particles before the flue gases enter into the boiler.
Design Approach:
A new De-Duster has been designed based on SCL option-3 & further improvement is done in terms of flow & pressure drop and demonstrated using the CFD analysis which includes “inlets ducts from cooler tap-off point to discharge side of the boiler HP PSH (i.e. Phase-1)”, to get insight on the flow movement, pressures & clinker dust particle collection efficiency in the new De-Duster hopper & existing hopper located below the HP SSH.
The steady state CFD analysis has been carried out by considering flow rate, temperature, pressure & clinker dust particle details as provided based on the test data obtained from the site.
Conclusion:
With new De-Duster, high velocity & recirculation regions are substantially minimized. The pressure drop obtained from cooler tap off to entry of sacrificial tubes found 238.4 Pa which is almost 50% less than original case. The analysis results show that the dust collection efficiency in the new De-Duster design is 63% & of existing hopper is 32% (total dust collection efficiency of 95%) with the best pressure drop of 88.7mmWC in phase-1 after optimizing the shape & size of the De-Duster along with its ducting.
