有机朗肯循环：从废热到电力

Heat That Usually Goes to Waste

M许多工业过程排出的热量，对常规蒸汽涡轮而言过低、却又高得仍有利用价值。与其排放，不如用有机朗肯循环将其转为电力。

How ORC Works

ORC 是以低沸点有机工质代替水的朗肯循环。废热使工质蒸发，蒸气驱动涡轮或膨胀机发电，工质冷凝后被泵回。该循环把本将损失的熱能转化为电网级电力。

Where ORC Pays Off

• 中低温废热，通常80至300摄氏度。
• 热量全天候可用的连续工艺流。
• 电价或碳成本较高、每回收1千瓦时都有明确价值的站点。

ORC and Heat Recovery Working Together

ORC 是回收链的最后一环。高品位热直接利用；中品位热驱动 ORC；其余仍可通过板式换热器预热空气或水。叠加多种回收技术能最大化单一热源的价值。

Practical Considerations

• 投资回收期取决于热量、温度与运行小时数。
• 工质选择影响效率与维护。
• 先从测量入手：热-电审计可判断相比更简单的空气-空气回收，ORC 是否值得。

Outlook

随着能源成本上升，废热发电从试点走向标准实践。对拥有稳定低品位热的工厂，ORC 是从成本中心迈向小型发电商最明确的路径之一。

常见问题

What is an Organic Rankine Cycle?
It is a Rankine power cycle that uses an organic working fluid with a low boiling point instead of water, letting it generate electricity from heat too cool for a conventional steam turbine.

What temperature range suits ORC?
ORC typically targets medium- and low-temperature waste heat, often in the range of roughly 80 to 300 degrees Celsius, depending on the working fluid and system design.

Where does ORC pay off?
It pays off where a steady stream of low-grade heat is available, such as engine and turbine exhaust, industrial process streams, geothermal sources, and biomass combustion.

How does ORC compare with direct heat recovery?
Direct air-to-air or air-to-water recovery reuses heat on site at high efficiency, while ORC converts heat into flexible electricity that can be exported, at a higher capital cost and lower overall efficiency.

常见问题

What is an Organic Rankine Cycle?

It is a Rankine power cycle that uses an organic working fluid with a low boiling point instead of water, letting it generate electricity from heat too cool for a conventional steam turbine.

What temperature range suits ORC?

ORC typically targets medium- and low-temperature waste heat, often in the range of roughly 80 to 300 degrees Celsius, depending on the working fluid and system design.

Where does ORC pay off?

It pays off where a steady stream of low-grade heat is available, such as engine and turbine exhaust, industrial process streams, geothermal sources, and biomass combustion.

How does ORC compare with direct heat recovery?

Direct air-to-air or air-to-water recovery reuses heat on site at high efficiency, while ORC converts heat into flexible electricity that can be exported, at a higher capital cost and lower overall efficiency.