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عنوان فارسی مقاله:
مفهوم CHP نوآورانه برای ORC و سود آن نسبت به مفاهیم متعارف
عنوان انگلیسی مقاله:
Innovative CHP concept for ORC and its benefit compared to conventional concepts
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The Organic Rankine Cycle (ORC) is an established technique for waste heat recovery, as well as for the utilization of biomass, geothermal energy and solar thermal energy [1]. Several reviews on technological aspects and applications can be found in literature [1–3]. Its application enables the electricity generation from low temperature heat sources and is especially applied in the small to medium size range (few kWe up to several MWe). Besides the working fluid selection, several technological approaches to increase either the system efficiency or the economic performance have been investigated in literature. Current research focusses on the following topics: 1. Optimized cycle configuration to increase efficiency (e.g. [4–9]). 2. Co-generation systems to increase flexibility (e.g. [10–16]). 3. Super- and trans-critical cycle operation to increase efficiency (e.g. [1,17–19,6]). 4. Working fluid mixtures to reduce exergy losses, GWP or costs (e.g. [20–23]). 5. Control strategies to increases operational stability and effi- ciency (e.g. [24–27]).Concerning cycle concepts, the majority of studies focus on simple ORC processes (e.g. [28,22,18,17,6]) or concepts with internal heat recovery (recuperator) [23,20,6,1]. Almost all of the organic working fluids have an isentropic (vertical slope of the saturated vapor curve) or dry expansion behavior (positive slope of the saturated vapor curve). These characteristic thermophysical property leads to superheated vapor after the expansion, which enables heat recovery in a so-called recuperator. Superheating of the live vapor should be avoided [14], because it does not increase the thermodynamic efficiency [4]. Besides this, recently two-stage ORC with turbine bleeding and regenerative preheating are focused especially for isentropic fluids. For pure power generation the relevant literature is summarized in the next paragraph.
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