ORC Waste Heat Power Generation
Organic Rankine Cycle (ORC) uses low-boiling organic matter to convert the temperature difference between heat source and cold source into electrical output, mainly used to recover low-temperature waste heat and low-grade thermal energy.
ORC system composition
Mainly composed of evaporator, condenser, working fluid pump and screw expander generator set
Energy transfer process
It consists of three processes: heat absorption process, expansion work and condensation process.
- Process ①-② (working fluid pump): working fluid pressure boost
- Process ②-③ (evaporator): working fluid turns into gaseous state
- Process ③-④ (expander): working fluid does work
- Process ④-① (cooler): working fluid turns into liquid state
Working principle
Using kiln flue gas as heat source, ORC generator set is composed of working fluid pump, evaporator, expansion generator, condenser and other main components. The organic working fluid circulates in the internal closed loop and indirectly contacts with the external cold and hot fluid. The working fluid in the closed loop has a clean operating environment and has product characteristics such as long economic life (≥20 years), good stability, high reliability and less maintenance.
Its working principle is as follows:
- The low-pressure liquid working fluid passes through the working fluid pump, and the working fluid is pressurized into a high-pressure supercooled liquid state, and enters the evaporator;
- The high-pressure liquid working fluid directly absorbs heat through the evaporator or indirectly absorbs the heat energy of the heat source medium (steam, hot water or heat medium oil, etc.) to evaporate into a saturated vapor state or a superheated vapor state, and enters the expansion generator;
- The superheated vapor working fluid enters the expander to rotate the expander to drive the generator, and then the generator shaft power is converted into electricity through magnetoelectricity and output to the power grid for use;
- The expanded superheated vapor working fluid releases heat energy through the condenser and condenses into a liquid state, and re-enters the working fluid pump to complete the ORC circulation system and continuously recover heat energy.
Power generation process
ORC waste heat power generation is implanted in the back end of the environmental protection system to maximize the utilization of flue gas waste heat, reducing costs and increasing efficiency for enterprises
System innovation
Optimize the efficiency of the heat exchange end and the comprehensive utilization of the cold end, and maximize the power output of the intelligent control system
- Heat source efficiency improvement: maximize the heat energy acquisition of the expander
- Cold source efficiency improvement: high condenser utilization rate
- Intelligent efficiency improvement: intelligent optimization and maximum power output
- System optimization: short investment recovery period
- Remote control: unmanned operation and maintenance
