Industrial production usually generates a lot of waste heat. How to effectively use the waste heat so that it will not be wasted has always been a problem. It is reported that about a quarter of Germany’s energy production is lost in this form.
According to a press release issued by the Karlsruhe Professional Information Center on the 15th, a Saarland-based technology company has proposed a new concept of waste heat recovery that can greatly increase the efficiency of waste heat power generation.
The company proposed the idea of ​​combining a steam-expansion engine with an organic Rankine cycle (ORC) cryogenic waste heat recovery method. The operating principle of ORC low temperature waste heat utilization method is similar to the traditional steam power generation principle. The difference is that this method uses a lower boiling organic liquid instead of water as the working medium, so that the lower temperature waste heat can also generate steam.
As of now, ORC low-temperature waste heat utilization method is usually used in combination with a turbine, but the power generation efficiency is relatively low. If you replace the turbine with a steam-expansion engine, the entire power generation process will become more flexible and efficient. This new method can be applied to different temperatures and pressures. Under the same thermal energy, the power generation efficiency is significantly improved.
At this stage, this type of waste heat power generation system combining the steam expansion engine with the ORC low temperature waste heat utilization method is being tested and is expected to enter the market in 2013. This technology is expected to have application potential in the areas of metal processing, glass manufacturing, chemicals, and papermaking. (Reporter Guo Yang)
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