Method and apparatus for use of low-temperature heat for...

F - Mech Eng,Light,Heat,Weapons – 01 – K

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F01K 25/10 (2006.01) B01J 3/00 (2006.01)

Patent

CA 2662463

The invention relates to the additional use of low-temperature heat for electricity generation using supercritical carbon dioxide as the working medium. The invention includes a method and an installation for use of the method, by means of which higher efficiency is achieved than with known methods and whose operating range covers a broader temperature band and thus a control range which makes it possible to ensure optimum driving during summer and winter without any design changes, with a simple physical design at the same time and without additional environmental hazards, with comparatively little hardwave complexity. At the same time, a reduction in the carbon dioxide emission is achieved. In order to implement the method, low-temperature heat is received from an existing heat source (1) by means of carbon dioxide, which is at a high supercritical pressure, as the heat carrier, and is then expanded, carrying out work, via an expansion machine (2) which is coupled to a generator (3) with the heat carrier being cooled down, then being liquefied using a refrigeration source (4) and being compressed again to the working pressure, in liquid form.

L'invention concerne l'utilisation auxiliaire de chaleur à basse température pour la production de courant en utilisant du dioxyde de carbone surcritique comme fluide de travail. Elle concerne un procédé et une installation d'application du procédé qui permettent d'obtenir un meilleur rendement qu'avec les procédés connus et dont la plage de travail comprend une bande de température plus large et une largeur normale telle qu'elle permet de garantir des modes de conduite en été et en hiver sans modifications de construction en même temps qu'une conception de construction simple, sans augmenter les menaces environnementales grâce à une consommation de matériaux comparativement réduite. Cela permet également de réduire les émissions de dioxyde de carbone. Le procédé consiste à extraire de la chaleur à basse température d'une source de chaleur (1) disponible, du dioxyde de carbone à une pression surcritique élevée servant de caloporteur, puis à effectuer une détente active au moyen d'une machine d'expansion (2) couplée à un générateur (3), ce qui fait refroidir le caloporteur, puis à liquéfier au moyen d'une source de froid (4) et à comprimer de nouveau à la pression de travail sous forme liquide.

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