The Indiana Department of Environmental Management has approved an air permit change for a new SO2 emissions control project on the coal-fired Michigan City Unit 12 of Northern Indiana Public Service.
Michigan City has one cyclone coal-fired boiler, identified as Boiler 12, with a design heat input capacity of 4,650 MMBtu/hr, with construction completed in May 1974, with an electrostatic precipitator with a flue gas conditioning system for control of particulate matter. Boiler 12 already has a selective catalytic reduction (SCR) system for NOx control. “A CDS Flue Gas Desulfurization System and a fabric filter baghouse were permitted to be installed on Unit 12 in 2013,” the final permit, issued on Feb. 26, noted.
The lime and FGD/baghouse waste handling components proposed for the project and approved by the agency include:
- Transport of pebble lime using pneumatic trucks on a paved road from the property gate to the lime storage silo – approximately 1.5 miles one-way.
- Two pneumatic truck unloaders for pebble lime transfer to one of two pebble lime storage silos equipped with bin vent filters.
- Injection of water to hydrators to hydrate the lime from CaO to Ca(OH)2, which makes it more reactive when contacted with the Unit 12 flue gas.
- A back-up system for hydrated lime delivery is provided, which includes a pneumatic hydrated lime truck unloader for direct transfer of hydrated lime to the hydrated lime storage silo bypassing the pebble lime storage and hydration system.
- Pneumatic system for loading ash into a truck for transport to the offsite landfill.
The NIPSCO website shows that the company plans to complete the new SO2 controls on Michigan City Unit 12 in 2018, with completion of SO2 controls in 2013 on the coal-fired Schahfer Unit 14 and in 2015 on the coal-fired Schahfer Unit 15. These projects are all needed under a January 2011 consent decree with the federal government.
The parent of NIPSCO is NiSource (NYSE: NI). NIPSCO’s three coal-fired plants – Bailly, Michigan City and Schahfer – have a net capability of 2,574 MW.
NIPSCO seeks approval of new MATS projects
NIPSCO on Feb. 22 applied with the Indiana Utility Regulatory Commission for approval of a series of new projects to address the U.S. Environmental Protection Agency’s Mercury and Air Toxics Standards (MATS), which are due to go into effect in April 2015. Timothy Caister, Director of Regulatory Policy for NIPSCO, said the MATS Compliance Plan includes: two types of capital projects to reduce mercury emissions – activated carbon injection (ACI) and Fuel Additives; one type of capital project to reduce particulate matter emissions; and several incremental O&M projects necessary to reduce emissions of mercury and particulate matter to levels required by MATS.
The capital projects include the following:
- Bailly Unit 7 (160 MW), ACI and Fuel Additives (mercury reduction);
- Bailly Unit 8 (320 MW), ACI and Fuel Additives (mercury reduction);
- Michigan City Unit 12 (469 MW), ACI and Fuel Additives (mercury reduction);
- Schahfer Unit 14 (431 MW), ACI and Fuel Additives (mercury reduction);
- Schahfer Unit 14, Transformer Rectifier Sets (TR Sets) (particulate matter reduction);
- Schahfer Unit 15 (472 MW), ACI and Fuel Additives (mercury reduction);
- Schahfer Unit 15, TR Sets (particulate matter reduction);
- Schahfer Unit 17 (361 MW), TR Sets (particulate matter reduction); and
- Schahfer Unit 18 (361 MW), TR Sets (particulate matter reduction).