TY - JOUR
TI - Off-design flow analysis of cogeneration steam turbine with real process data
AU - Strušnik Dušan
AU - Kuštrin Igor
AU - Avsec Jurij
JN - Thermal Science
PY - 2022
VL - 26
IS - 5
SP - 4107
EP - 4117
PT - Article
AB - This paper presents the concept of reconstruction of the existing coal-fired  combined heat and power plant to comply with new European environmental  policies. The existing coal-fired boiler will be replaced by two new dual  pressure heat recovery steam generators, which will utilize the exhaust gas  heat from two new gas turbines. The steam from the heat recovery steam  generators will be fed to the existing steam turbine. After the  reconstruction, the nominal turbine inlet steam mass-flow of 40 kg/s will be  reduced to 30 kg/s. During periods of low heat demand, only one gas turbine  and one heat recovery steam generator will be in operation and the live  steam mass-flow may drop even to 12 kg/s. Prior to the reconstruction,  dedicated tests of the existing steam turbine were carried out using the  steam from the existing coal-fired boiler. The goal of the test was to  verify the viability of operation with such an extremely low mass-flow. The  results of tests show that such operation is possible but inefficient from a  power generation point of view. Besides this, the turbine control algorithm  needs to be accommodated to this extreme operating regime and additional  measures like displacement of the extraction points and steam cooling will  be required to control the temperature of the steam extractions. The novelty  of this paper is using real pre-reconstruction process data for the  assessment of feasibility and efficiency of the post-reconstruction  operation of a combined heat and power turbine.