A Method for Optimizing the Efficiency of Regeneration Cycle

Abstract

The present invention proposes a method for optimizing the efficiency of the regenerative cycle, the steps of which are as follows: Step 1: Determine the flow path and flow distribution of the working fluid in the thermal system, as well as the state change of the working fluid in the cycle, and set the first steam turbine The process from steam extraction to the first-stage regenerative heater is A, and the process from the first steam turbine to the second-stage regenerative heater is set as B; Step 2: Define the flow coefficient as 1 and the state as ( p 1 ,t 1 ) of new steam enters the first steam turbine from the first boiler for adiabatic expansion to work, until the pressure is p A Extract part of the steam α A , leading to the first stage regenerative heater; step 3: the rest of the steam in the first steam turbine (1‑α A ) continues to expand and do work until the pressure p B α B lead to the second-stage regenerative heater; step 4: define the flow coefficient from the first steam turbine to the first condenser as 2, and transfer the remaining steam α C =(1‑α A ‑α B ) continues to expand to p 2 Then it is discharged into the first condenser, whereby the present invention has the advantages of reducing the average heat exchange temperature difference in the heat recovery process and improving the thermal cycle efficiency.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and particularly relates to a method for optimizing the efficiency of a heat recovery cycle. Background technique [0002] At present, with the continuous improvement of high-temperature performance of materials, the steam parameters of coal-fired generator sets are continuously improved to obtain higher cycle efficiency, further reduce the coal consumption of the unit, and reduce the emission of greenhouse gases and other pollutants. In the late 1990s and the beginning of the 21st century, the European Union, the United States and Japan successively launched a research program on advanced ultra-supercritical (USC) power generation technology with parameters of 700°C and above, to provide technology for the update of next-generation thermal power equipment. The "AD700" advanced ultra-supercritical power generation plan launched by the European Union in January 1998, its goal is t...

AI Technical Summary

Problems solved by technology

Because the saturation temperature in the condenser is very low, in the whole process of heating feed water to superheated steam in the first boiler, the average temperature of endothermic heat is not high, resulting in low thermal efficiency of Rankine cycle

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