Abstract
Calculations to determine optimum value of steam reheat temperature in relation to the cycle arrangement of steam turbine power plant with gas turbine topping are conducted in this paper. Operation of T-250-240 turbine unit in cogeneration mode has been considered during steam reheat displacement from steam boiler to heat recovery boiler.
Highlights
There are various possibilities for reconstruction and extension of steam power stations durability, some of which are discussed in [1,2,3,4,5,6]
The most common cycle arrangement is heating of feed water and condensate in heat recovery boiler (HRB), which is called gas turbine (GT)-topping with regeneration displacement
Analysis of CCGT operation with K-300, T-250 steam turbine units shows that displacement of regeneration has significant disadvantages [1, 2]: 1) efficiency of the steam cycle is reduced as a result of heat loss increase in condenser; 2) capacity of steam turbine decreases due to limitation of the maximum steam flow through the last stage of the turbine
Summary
There are various possibilities for reconstruction and extension of steam power stations durability, some of which are discussed in [1,2,3,4,5,6]. Relevance of reheat and selection of its parameters is not obvious for cogeneration steam turbine plants (CSTP), which operate most time of heating season with maximum heat output to external consumer, because the effect from annual power generation increase due to RH does not always exceed the loss of profitability. Extraction turbines operating at initial pressure of 13 MPa, such as T110-130, T-175-130, etc., are constructed without RH in contrast to condensing units operating at the same pressure (K-210-130, K-160-130)
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