Stumptown Coffee to roast greener beans

Stumptown Roaster Matt Dawson demonstrates the process at the company's facility on Southeast Division Street.

Stumptown Roaster Matt Dawson demonstrates the process at the company's facility on Southeast Division Street.

Stumptown Coffee Roasters and Energy Trust of Oregon are teaming up for one of the largest gas-savings projects the trust has ever funded.

Stumptown, which is preparing to move from its original home to modern quarters in the Central Eastside (Portland Business Journal subscribers can read all about the move here), will retire the high-temperature afterburner it uses to burn off particulates in the emissions from its coffee roaster.

Oregon law requires manufacturers to scrub air before releasing it to the environment. It is an energy-intensive process.

Matt Dawson, a roaster at Stumptown, demonstrated how the current system works during a recent tour of the company's existing plant in Southeast Portland.

The afterburner works in tandem with Stumptown’s roaster, which can process up to 100 pounds of coffee beans at a time. As the roaster heats up and the green beans turn to brown, the temperature in the gas-fired afterburner rises to the 1,300 degrees needed to incinerate the organic particles coming off the beans.

It takes a lot of gas to reach those high temperatures. Stumptown buys and roasts more than 2 million pounds of green coffee beans annually and runs its roasting equipment seven days a week. Gas is a major expense.

Matt Lounsbury, operations director, expects the new system will curb its demand by at least 25 percent.

When it moves, Stumptown will retire the afterburner in favor of a “regenerative thermal oxidizer” or RTO. The Energy Trust is contributing about $200,000 toward the cost. Stumptown officials expect the new system to cut its gas bill by a quarter and to pay for itself within three years.

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