A Method for Predicting the Flammability Range of Mixed Working Fluids in Thermodynamic Cycle

Abstract

Provided is a method for predicting the flammable range of a thermodynamic cycle mixed working medium. The method predicts the upper flammable limit and the lower flammable limit of a mixed working medium respectively, and comprises establishing a flammable limit prediction model based on a critical flame temperature theory, then carrying out linear fitting on a flame limit value of an HCs / CO2 mixed working medium obtained from a test and a corresponding CO2 volume fraction according to the predication model, and obtaining an undetermined coefficient in the predication model so as to obtain an optimal flammable limit prediction model. The method overcomes the defect that a theoretical prediction model needs to depend on the selection of an appropriate critical flame temperature to be determined, greatly improves the predication precision, ensures the accuracy of the flammable limit predication data of the HCs / CO2 mixed working medium, and provides an accurate reference basis for the safety assessment in the case where this type of mixed working medium is applied to a thermodynamic cycle system.

Description

technical field [0001] The invention belongs to the technical field of thermal cycle, and in particular relates to a method for predicting the combustible range of a thermal cycle mixed working fluid. Background technique [0002] In recent years, the problems of energy shortage and environmental pollution have become more and more serious. Carrying out energy conservation and emission reduction is an effective way to alleviate these two problems. Research on waste heat (such as internal combustion engine exhaust waste heat and industrial waste heat, etc.) power generation technology is helpful for reducing fossil energy consumption and CO 2 Emissions of greenhouse gases are of great significance. Using organic Rankine cycle for waste heat power generation is an effective way to save energy and reduce emissions. However, if the waste heat temperature is too high and exceeds the decomposition temperature of the organic working fluid, it will lead to changes in the thermal pr...

AI Technical Summary

Problems solved by technology

But for similar HCs / CO 2 The flammability limit prediction accuracy of this mixture containing non-combustible substances is low

Prediction of HCs / CO by Critical Flame Temperature Theory 2 The accuracy of the flammable limit of the mixture is high, but how to determine its relatively accurate critical temperature is very difficult

Images