Martin Creates Long-Term Solution To Material Flow Problems
Product Types Used Air Cannon Solutions , Transfer Point Solutions , Air Cannons
Solutions Martin® Maintenance & Installation Services
Industry Coal-Fired Power
Customer Hennepin Power Station, Dynegy Midwest Generation Hennepin, Illinois


Hennepin Power Station

During the plant’s summer outage, an independent contractor designed and installed new chutes to feed the coal mills. But at start-up, material clogged in these new chutes and closed off the flow of coal into the boilers, causing the plant to shut down. The plant needed an emergency-response “quick fix” to return to production and an engineered solution for long-term correction.


Martin Engineering designed and installed new chutes to improve material flow at Hennepin Power Station.

Martin Engineering responded the next business day to get the plant on-line. Crews from MartinPLUS® Installation Service replaced the abrasion-resistant steel liners in the chutes with low-friction UHMW polyethylene. In one shift, MartinPLUS® Installation field crews had two of three chutes converted, allowing the plant to return to operation.

To provide a more reliable arrangement, Martin Engineering designed new chutes using a steeper approach to the mill inlet and incorporating a stainless steel half-trough pan to promote flow. The design also called for installation of Martin® Air Cannons one on each chute to discharge along the back of the chute and blow out potential material bridges.

After fabrication of the components, Martin Engineering delivered the chute section to the plant to await a suitable outage for installation. When the plant went down for a scheduled outage, installation crews from MartinPLUS® Installation Services worked around the clock on 12-hour shifts to complete the installation. The plant returned to operation in 36 hours on schedule.


Air cannons are installed on the new chutes at Hennepin Power Station to prevent blockages.

Coal flow has been maintained without plant shutdowns. “We do appreciate the responsiveness of Martin Engineering and their willingness to schedule and reschedule to meet our needs.”


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