Enhance The Thermal Efficiency Of The Steam Power Cycle By Use Absorbent Material

Little amount of heat recovery or waste heat recovery that rejected or remained from various types of applications and sources is an attracted issue that received recently considerable concern.Though,there are many of cycles that promised to recover that wasted energy or little amount of heat,but still those cycles did not dealt enough with the requirements.To design new system that it has ability and flexibility to recover that amount of heat in low capital cost is an interested issue.This research stated on design new system,which is transforming for Rankine steam cycle.The idea is came to solve the restricting and limiting problems in Rankine cycle from work at extremely low conditions of temperatures and pressures.The system used the water as working fluid same as Rankine cycle.The modifying design is came simply by use an absorber,which is containing on absorbent material at specific concentration.The absorbent material work on absorbs the moisture steam after finishing the expansion process at the exit of the turbine for completely soluble steam(moisture)in an absorbent material,the mixture pumped to another process.The purpose of this is to replace the steam condenser in Rankine cycle and solve the restricting problem from lowering the pressure of the moisture steam at vacuum pressures without make any effect in the saturating temperature of the same steam.In the Rankine cycle by providing like this effect it was impossible.The absorbent material that chose it was Lithium Bromide by based on specific thermodynamic properties and specifications.Low-pressure steam and relatively low temperature moisture steam enters the absorber at constant pressure and temperature(according on the operating conditions and selected solution concentration).The moisture steam interacted with absorbent material inside the absorber in exothermic process,then by rejected some of interacting and steam heat to the environment for completely soluble process in each other(moisture steam and lithium bromide),the mixture pumped to the pressure of the Steam generator.In this manner,we can convert the steam into solution at wade ranges of low pressures without effect in the absorber temperature(low side working temperature).Steam generator operating on release the working fluid,which is the steam from the solution.The released steam continue its job by receiving extra heat from super heater,then it driven to the turbine to expand there and producing work.The remaining solution in the base of the steam generator circulate back to the absorber over throttling valve to perform another absorption process.The research covered all the design elements of select and study the properties of absorbent material,avoid the corrosion effect by find the suitable alloys and technologies for construction,system modelling,and system analyses.The system analysis and simulation involved comparison in between Rankine cycle and new designed system,since both are used water as working fluid.Both systems received the same working parameters and conditions.The thermodynamic simulation showed how the new designed system more effective than Rankine cycle at really operating conditions as well proved in analysis how the new designed system has flexibility from work at temperatures and pressures excessively low,which the steam Rankine cycle failed from work at it.Finite time system analyses provided data of temperatures for the assumed parameters in the thermodynamic simulation.That provided real comparison to estimate the thermal efficiency of the system when it work ideally(Carnot efficiency)and when it work at condition internally reversible.