Increasing efficiency of CCP-based TPP with injection of dry saturated steam from recovery boiler into regenerator

Abstract

The object of this study is a contact combined-cycle plant with the injection of dry saturated steam into a regenerative air heater and with water heating recovery boiler. Peculiarity of the scheme is that for cooling the turbine flow range and for injection, we used dry saturated steam and the mixing point is a regenerator. In order to reduce heat loss to the environment we additionally inserted water heating recovery boiler. The study was conducted using the software package “Computer analysis system for CCP and GTP combination”. We introduced the results of the optional optimization parameters of working fluids, which were made according to the given scheme. Additional useful power increase of CCP occurs due to the use of steam cooling. Efficiency thus reaches 47.52% and the capacity of water heating recovery boiler reaches 2.1 MW. To verify the calculations, we used mathematical modeling method based on graph theory.