Open Access3-E analyses of a natural gas fired multi-generation plant with back pressure steam turbine
Author(s) -
Pradip Mondal,
Samiran Samanta
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1240/1/012113
Subject(s) - exergy , combined cycle , combustion chamber , turbine , natural gas , environmental science , combustion , steam turbine , steam electric power station , exergy efficiency , nuclear engineering , chemistry , waste management , engineering , mechanical engineering , organic chemistry
Energetic, exergetic and environmental (3-E) analyses of a natural gas fired multigeneration (NGFMG) plant is carried out in this study. The plant is consisting of a topping gas turbine (GT) block with fixed 30 MW e output, bottoming back pressure steam turbine (ST) block with variable electrical output and utility hot water generation block with variable generation capacity. Variation of topping cycle pressure ratio (r p =2-18) and gas turbine inlet temperature (TIT=750-850 °C) as plant operational parameters on the 3-E performance of the plant of are reported here. Base case performance (at r p =4 & TIT=800°C) of the plant shows that the plant is about 33% electrically efficient at base case with fuel energy savings ratio (FESR) value of 40 %. Electrical efficiency of the plant along with FESR increases with either increase in r p or in TIT. However ST output and hot water production rate decreases with increase in the value of plant operational parameters. Exergy analysis of the plant shows that maximum exergy destruction occurs at the combustion chamber. Exergy analysis also signifies that isentropic efficiency of the GT can also be a plant influencing parameter. From emission point of view it is observed that electrical specific CO 2 emission is 0.6 kg/kW e h at base case. Specific CO 2 emission rate gets lowered with either increase in r p or in TIT.