Abstract
Increase of operating efficiency of mine energy complexes is an actual scientific and technical problem. Systems that utilize energy of low-potential sources and have freon-steam turbines are suggested to be included in mine energy complexes. Principles of selection of freons as working fluids in energy systems are suggested in the paper. Usage of some thermal equations of state for defining thermal and physical properties of freons is analyzed. Equation of isentropic process for the thermal Redlich–Kwong equation of state is obtained. Calculation of energy efficiency of a system with a freon-steam turbine for selected variants of usage of working fluids is performed. A calculation method of thermodynamic parameters that are necessary for energy conversion efficiency estimation of specific freons in a system of useful utilization of energy is developed. Analysis of results indicates that usage of ozone-safe and fire-safe freons in energy utilization systems of low-potential sources with a possibility of utilization of additional waste heat, which was not used in the past, allows increasing the operating efficiency of mine energy complexes.
Highlights
Requirements of the modern situation on economical use of non-renewable resources lead to a necessity of development of technical solutions aimed at the usage of waste heat sources of various origin
Large volumes of waste heat are produced during operation of main technological equipment of mine energy complexes (MEC) [1]
It is characteristic for a freon as a working fluid to have thermal stability in a range of operating temperatures and it must fulfill the requirements of ecologic indicators
Summary
Requirements of the modern situation on economical use of non-renewable resources lead to a necessity of development of technical solutions aimed at the usage of waste heat sources of various origin. Large volumes of waste heat are produced during operation of main technological equipment of mine energy complexes (MEC) [1]. Geothermal energy and concentrated solar radiation are as interesting for useful utilization as waste heat of secondary (waste) energy resources (WER) of main technological equipment in mining, in particular, coal industry, and metallurgy. Temperature range of low-potential energy sources can be roughly estimated by the interval of 305 К (32 oС) to 573 К (300 oС). The analysis of structure of such WER with the indicated temperature range shows that the common property is as follows: the lower the value of temperature (temperature potential) is, the larger volume (flow rate) of WER can be usefully utilized
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call