Basin Electric Power Cooperative said July 31 that a project is getting underway to install selective non-catalytic reduction (SNCR) equipment for NOx control at the Leland Olds Station near Stanton, N.D.
The equipment will help the plant meet North Dakota’s NOx reduction standards. Jim Lund, Basin Electric senior project manager, said the installation will begin in August, with a plan to begin testing in spring 2016. The Leland Olds Station must be in compliance by April 2017.
Cris Miller, Basin Electric senior environmental project specialist, said SNCR is the last NOx control technology to be installed to be fully compliant with the level of NOx control that was identified in the North Dakota Department of Health’s Regional Haze Implementation Program.
Lund said headquarters staff is working closely with staff at Leland Olds Station on engineering efforts, which include computational fluid dynamic and combustion modeling of the both Unit 1 and Unit 2’s boiler to determine the correct location for the urea-based reagent’s injection locations. The overall NOx reductions are based on the incorporation of several technology layers such as enhancements to burners, incorporation of separated over-fire air, relocation of vent return lines, incorporation of combustion, performance and sootblowing optimization software in the boiler control systems. The engineering studies, design and installation effort began several years ago.
Les Allery, plant engineer at Leland Olds, said the SNCRs will include several components, including a urea storage building, urea mixing equipment and piping to the injection ports to the boiler. Liquid urea will be injected into the boiler at new injection ports in the area just above the fireball of the boiler. The NOx in the gas in the boiler will combine with urea and oxygen, to create nitrogen, water vapor and carbon dioxide.
Both units at Leland Olds will be fitted with this equipment. The project will cost $29m for both units.
Leland Olds Unit 1 is a 222-MW facility. Leland Olds Unit 2 is a 447-MW facility. In 2012 and 2013, work was completed on a $410m project to install two wet limestone scrubbers to reduce SO2 emissions. The plant uses 3.3 million tons per year of lignite produced at the nearby Freedom Mine.