Grain Drying Room Waste Heat Recovery: Rotary Heat Exchange Cuts Energy Use 30%

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Project Background

A grain storage enterprise owns 6 continuous drying towers; the drying medium temperature is about 120°C, and the high-temperature exhaust was previously discharged directly.

Challenges

In winter, large volumes of gas heat the fresh air; heating energy exceeds 35% of drying OPEX, and the heat emission pollutes the surroundings.

Solution

Install on the exhaust side of the drying room:Rotary Heat Exchanger, recovering exhaust sensible heat to preheat the fresh air entering the drying tower and forming an energy loop.

Results

Fresh air preheated to 60–70℃; gas consumption reduced by 30%, with a payback period of under 2 years based on local energy prices.

粮食烘干房余热回收案例

某粮食烘干房引入转轮换热回收排风余热用于预热新风，燃气消耗下降约 30%，投资回收期不到两年。该项目验证了转轮热回收在连续高耗热场景下的经济性，已成为粮食干燥节能改造的标杆做法。

适用规模

该方案对连续式大处理量烘干线收益最明显，也适用于原有烘干房节能改造。改造前建议做能耗审计，量化可回收热量与投资回报。

适用规模

该方案对连续式大处理量烘干线收益最明显，也适用于原有烘干房节能改造。改造前建议做能耗审计，量化可回收热量与投资回报，再决策实施，确保改造真正产生效益。

粮食主产区烘干季集中，提前规划改造可在当季即获得节能收益；建议结合当地气候与作业节奏安排施工窗口。

建议结合当地粮食品种与烘干季长度做回报测算，把节省的燃料费用与改造投入直接对比，用数据支撑改造决策与预算申请，提升立项通过率与执行效率。