scholarly journals An experimentally validated control strategy to optimize power generation quality for waste heat recovery system

2020 ◽  
pp. 243-243
Author(s):  
Yanjun Xiao ◽  
Jing Wang ◽  
Yameng Zhang ◽  
Zhaozong Meng ◽  
Feng Wan ◽  
...  
Keyword(s):  
Power Generation ◽  
Control System ◽  
Control Strategy ◽  
Waste Heat ◽  
Generation Process ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Working Parameters ◽  
And Control

Roots-type engine is suitable for small power generation system fuelled by waste heat. The disorderly fluctuations of the waste heat source upstream of the power generation process and changes in external environmental factors cause the working parameters of the device to change, which makes the speed of roots engine unstable, and the output power quality of the system is not good. For this problem, this paper starts from the control structure and control strategy to improve the adjustment speed and anti-interference ability of the control system. In this contribution, the model transformation of the dynamic work unit of waste heat power generation device from engineering to theoretical model is performed, the temperature of working gas and the speed of output shaft of roots engine are determined as control objects, and the internal mode control strategy is introduced to optimize the controller of the system. Simulation results are in good agreement with the measurements, which verify that the optimized control system can effectively improve the following ability and anti-interference of the system, and shorten the response time.

scholarly journals Diesel engine waste heat recovery system comprehensive optimization based on system and heat exchanger simulation

Open Physics ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 331-340
Author(s):  
Da Li ◽  
Qiang Sun ◽  
Ke Sun ◽  
Guodong Zhang ◽  
Shuzhan Bai ◽  
...  
Keyword(s):  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Exergy Efficiency ◽  
Bench Test ◽  
Waste Heat Recovery System ◽  
Recovery System ◽  
Heat Recovery System ◽  
System Output

Abstract To further improve the thermal efficiency of diesel engines, a waste heat recovery system model utilizing organic Rankine cycle (ORC) is constructed and verified through system bench test and heat exchanger bench test. To recover waste heat from diesel engine exhaust, ethanol, cyclopentane, cyclohexane, R1233zd (E), and R245fa were selected for comparison. The quality of heat source, the quality of evaporator, the system output, and the system complicity were taken as variables for comparison. Analysis shows that for ORC systems without recuperator, ethanol system has the best system output of the five in a wide operation temper range, with the highest exergy efficiency of 24.1%, yet the exergy efficiency increase after the application of recuperator, 9.0%, is limited. For low temperature exhaust, cyclopentane system has the best performance with or without recuperator, and the cyclopentane system with recuperator has the best performance in terms of exergy efficiency, 27.6%, though complex heat exchangers are also required for high power output. The system output of the R1233zd system is better than the R245fa system, yet the advantage of low evaporate temperature can be better utilized for low quality waste heat recovery.

Sign in / Sign up

Export Citation Format

Share Document