The Michigan Department of Environmental Quality’s Air Quality Division is taking comment until June 23 on a plan to issue a draft air Permit to Install (PTI) to Michigan Sugar Co. so it can replace two coal-fired boilers with a re-located natural gas-fired boiler at a sugar beet processing plant in Croswell, which is just north of Detroit in the Thumb area of the state.
The Croswell facility is an existing major stationary source under the state and federal Prevention of Significant Deterioration (PSD) regulations, and is currently a major source of hazardous air pollutants (HAPs) emissions.
Michigan Sugar processes sugar beets to manufacture table sugar, with molasses as a byproduct. It currently operates two coal-fired boilers for steam production for the sugar processing operations. The coal-fired boilers are subject to the recently-promulgated Boiler MACT. Rather than upgrade the two coal-fired boilers to meet the Boiler Maximum Achievable Control Technology (MACT) requirements, Michigan Sugar has chosen to replace them with one natural gas-fired boiler. This natural gas-fired boiler is rated at 175.5 million British thermal units per hour (MMBtu/hr) and will produce the same steam load as the existing two coal-fired boilers.
The proposed natural gas-fired boiler is being re-located from a different facility. No other equipment is affected by this replacement.