Cement Energy and Environment

4.0 Evaluation of Options All four options have been evaluated on following parameters: · arameter Option 1 Option 2 Option 3 Option 4 System Description Conversion of Installation of new bag Conversion of Retention of existing ESP into Bag filter of 54,500 m 3 /hr ESP into Hybrid bag filter of 30,000 Filter Bag Filter m 3 /hr and Installation of new bag filter of 30,000 m 3 /hr Emission (mg/Nm 3 ) <30 <30 <30 <30 Impact on mill capacity Yes, as mill has to Yes, as mill has to during execution of operate at 50% No operate at 50% No project capacity for - 45 capacity for -30 to 60 days to 45 days Space Requirement Less More than all other Less Less options Civil audit of existing Yes (as casing of Yes (as casing of structure ESP may be Yes ESP maybe Yes extended) extended) Installation Cost Moderate More Moderate Less Financial Qualification Do not qualify due Do not qualify due to substantial Qualify to substantial Qualify production loss production loss during execution during execution E&l modifications More Less More Less Maintenance cost More due to high Less Less inventory cost Less Layout Advantage Yes Yes Yes Yes Equipment delivery Comparable in all Comparable in all Comparable in all Comparable in all time options options options options Project Execution time Comparable with Comparable with Comparable with Least as compared to option-2 and 3 option-1 and 3 option-1 and 2 option-1 ,2 and 3 Commissioning ········ Advantage of existing ........ Advantage of existing Aspects ESP and Bag filter can ESP and Bag filter can be taken during the time be taken during the time of new bag filter of new bag filter commissioning. commissioning. In case of initial In case of initial tethering problem of BF, tethering problem of BF, plant can be operated plant can be operated at full capacity. at full capacity. Utility Requirement Comparable with Comparable with Less Comparable with option-2 and 4 option-1 and 4 option-1and 2 Dismantling More No Moderate No Requirement Comparative evaluation of the above 4 options clearly indicates that the option 2 and option 4 are more viable with respect to techno-economic aspects. cement mill venting system, investment involved, implementation schedule, production losses and shutdown time for the above four options, retaining the existing bag filter of 30,000m 3 /hr and installation of a new additional capacity (30,000m 3 /hr) bag filter system (Option 4) is the most cost competitiveness suitable option for the up-gradation of cement mill venting system. NCB can take up projects to estimate the best feasible cost competitive option to reduce the dust emission from the stack by conducting optimization studies of the existing APCE's in cement plants. Option 1 and option 3 does not qualify financially as both the options leads to production losses during project execution period of 45-60 days and 30-45 days respectively. Conclusion Considering various technical aspects, dust collection efficiency, operation & maintenance of ****