Process and device for using of low temperature heat for the production of electrical energy

Abstract

The invention relates to the using of low temperature heat for the production of electrical energy by using of supercritical carbon dioxide as working fluid.

It included a process and a device for process realizing with higher efficiency in relation to other known processes and with a wide temperature working range. This is related to a wider adjustability which allows an optimal operation both in summer and in winter operation without technical or constructional changes. The process is realizable without damages to the environment and is realizable with low effort. The relative emission of carbon dioxide is reduced in relation to other processes.

Low temperature heat from a given heat source (1) is taken off by carbon dioxide at high supercritical pressure as heat transfer and working fluid in the process. Then the heated fluid is expanding in an expansion machine (2), which is connected with a generator (3) for the production of electric power. In this process the fluid will be cooled, then liquefied by using of a cold source (4) and in liquid state compressed to the working pressure.

Description

[0001]The invention relates to the using of low temperature heat for the production of electrical energy by using of supercritical carbon dioxide as working fluid.FIELD AND BACKGROUND OF THE INVENTION[0002]There known two methods for the using of low temperature heat from burning and reaction processes as well as from solar thermal and geothermic processes essentially:[0003]1. In the OCR (Organic-Rankine-Cycle)-process the heat is taking away from the process medium by a heat exchanger and using for the production of steam. Refrigerants, freezing or low boiling substances as e.g. pentane are used in this process, vaporized and labor-producing expanded due a expansion turbine connecting with a generator. The expanded vapor is used for preheating and then condensed. The heat of condensation will be delivered into the surrounding. The efficiency is estimated by the difference between the temperature of condensation (temperature of the surrounding) and the reachable temperature of vapor...

AI Technical Summary

Problems solved by technology

Disadvantageous are the problems with the construction material by using of the aggressive ammonia-water mixture which is leading to a lowering of the cycling time of the little proved plant.

Another disadvantage is the danger of possible emissions of the high-toxic and environmentally dangerous ammonia at possible leakages or disturbances.

The often used two-pressure and three-pressure cycles for a better adaption are causing a higher effort in material and control.

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