Organic Rankine cycle system

Abstract

The invention relates to an organic Rankine cycle system. The organic Rankine cycle system. The organic Rankine cycle system. The organic Rankine cycle system comprises a working medium pump, an evaporator, a condenser and a cooling pump, and further comprises a working medium pump rotating speed control loop and a cooling pump rotating speed control loop. The working medium pump rotating speed control loop comprises a first deviation calculation block, a cascade adjustment main adjustment PID adjusting block, a second deviation calculation block and a cascade adjustment auxiliary adjustment PID adjusting block which are connected in sequence. The first deviation calculation block inputs the outlet temperature of a heat source of the evaporator and a set value of the outlet temperature ofthe heat source. The second deviation calculation block inputs output of the cascade adjustment main adjustment PID adjusting block and the pressure a working medium outlet of the evaporator. The cascade adjustment auxiliary adjustment PID adjusting block is connected with the working medium pump. The cooling pump rotating speed control loop comprises a third deviation calculation block and a third PID adjusting block. The third deviation calculation block inputs the cooling water flow set value and the inlet cooling water flow of the cooling pump. The third PID adjusting block is connected with the cooling pump. Compared with the prior art, the organic Rankine cycle system. The organic Rankine cycle system has the advantages of improving the heat recovery amount and the heat efficiency and increasing the net output power.

Description

technical field [0001] The invention relates to the technical field of organic Rankine cycle system control, in particular to an organic Rankine cycle system. Background technique [0002] The Organic Rankine Cycle (ORC) is widely used in the fields of low-quality thermal energy utilization and waste heat recovery. The net power output of an ORC system depends on both heat recovery and thermal efficiency, both of which are affected by heat exchanger pinch points. The pinch point of the heat exchanger refers to the position where the temperature difference between the hot and cold fluids on both sides of the heating surface is the smallest, and the temperature difference at this point is called the pinch point temperature difference. If the pinch point temperature difference is too small, the heat recovery will be reduced, and if the pinch point temperature difference is too large, the thermal efficiency will be reduced. Existing studies have shown that the temperature diff...

AI Technical Summary

Problems solved by technology

Experimental and model calculation results show that these control methods will affect the pinch point, thereby affecting the heat recovery, thermal efficiency and net output power

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