3-E analysis of advanced power plants based on high ash coal

Abstract

SUMMARYThe objective of the study is to identify the 'best' possible power plant configuration based on 3-E (namely energy, exergy, and environmental) analysis of coal-based thermal power plants involving conventional (subcritical (SubC)) and advanced steam parameters (supercritical (SupC) and ultrasupercritical (USC)) in Indian climatic conditions using high ash (HA) coal. The analysis is made for unit configurations of three power plants, specifically, an operating SubC steam power plant, a SupC steam power plant, and the AD700 (advanced 7001C) power plant involving USC steam conditions. In particular, the effect of HA Indian coal and low ash (LA) reference coal on the performance of these power plants is studied. The environmental impact of the power plants is estimated in terms of specific emissions of CO 2 , SO x , NO x , and particulates. From the study, it is concluded that the maximum possible plant energy efficiency under the Indian climatic conditions using HA Indian coal is about 42.3% with USC steam conditions. The results disclose that the major energy loss is associated with the heat rejection in the cooling water, whereas the maximum exergy destruction takes place in the combustor. Further, the sliding pressure control technique of load following results in higher plant energy and exergy efficiencies compared to throttle control in part-load operation.

Integrating SO2 and NO x control systems in Indian coal-fired power plants

“…Since, we do not have much data about supercritical units in India, because they are newly coming up and have not started performing to their best capacity yet, we assume the same auxiliary consumption for the 660 MW net plant. This is so because Suresh et al (2010) Fig. 4 Schematic of power plant using SCR abd FGD.…”

Thermodynamic analysis of a coal-fired power plant repowered with pressurized pulverized coal combustion

“…The characteristics of a typical HA Indian coal used in coal-fired power plants in India are presented in Table 1 [13,18]. Indigenous coals used in thermal power plants in India have mineral matter as high as 40-45 per cent.…”

“…Variation in the specific emission of CO 2 (kg/kWh) from the PF plant using HA/LA coals is observed to be negligible for the assumed excess air ratio of 20 per cent. The effects of LA coal compared with HA coal on energy and exergy performance of coal-fired Thermodynamic analysis of a coal-fired power plant repowered with pressurized pulverized coal combustionpower plants have already been presented in detail by the authors in their earlier work [13].…”

Energy Analysis of a Biomass Co-firing Based Pulverized Coal Power Generation System

“… The isentropic efficiency for each steam turbine is 85% and for each pump is 88% [40].  The mechanical efficiency of each turbine and the generator efficiency are 99%, and 98% respectively [47][48][49].…”