Power generation from fluegas waste heat in a 500 MWe subcritical coal-fired thermal power plant using solar assisted Kalina Cycle System 11

In the conventional coal power plants, substantial amount of energy loss takes place through condenser, fluegas and coal mills rejection. Separate studies based on these waste heat resources with single Kalina Cycle System (KCS) in each case shows improvement in plant efficiency with additional power generation but the present study shows the combined waste heat utilization of condenser, fluegas and coal mill rejection in a 500MW e subcritical (SubC) coalfired thermal power plant using single solar assisted KCS. The modified configuration reduces the system complexity, space requirement and irreversibility by using less number of equipments. The system is thermodynamically modelled by MS-Excel macros for analysing the system performance at different conditions. The study shows that an additional electricity generation of about 10 738.42 kW increases the plant net energy and exergy efficiencies by about 0.852% and 0.761% points, respectively resulting in reduction of CO 2 emission by about 8.78 tons per hour at 55 K degree of solar heating. About 55.75 K and 7.20 K are the optimum Log Mean Temperature Difference (LMTD) values of the evaporator and steam condenser, respectively that yields the maximum net energy output economically at 12.60 bar operating pressure. Effect of solar energy variation on system performance is also carried out by varying the degree of solar heating. Economic analysis of the proposed system is also performed by considering 25 years of equipment life and a loan interest of about 14%. The cost of electricity and simple payback period (SPP) of solar assisted KCS are about Rs. 0.83/kWh and 1.19 years, respectively, at 55 K degree of solar heating (optimum). The study further shows that the levelized cost of excess electricity generation by solar heater is lower than the standalone solar thermal power plant by about 53.78%.

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“…Details algorithm for the computer simulation is given in Figure 2A,B. 3. 17 5. Shell pressure of steam condenser is 0.103 bar.…”

Section: Methodsmentioning

confidence: 99%

“…Pump's mechanical efficiency: 85%. 17 10. Isentropic efficiency of feed pump and turbine cylinder: 90%.…”

Section: Methodsmentioning

confidence: 99%

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A novel solar assisted Kalina cycle system for waste heat utilization in thermal power plants

Khankari

Karmakar

2020

Intl J of Energy Research

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“…Results show that the moderate-temperature solar and coal-fired power plant hybridization can provide a promising direction for efficient utilization of low-grade solar heat. [10] simulated proposed kalina cycle system 11 (KCS11) assisted with indirect solar heating system ,parabolic trough solar collectors with oil heating fluid is used to superheat Ammonia -water binary mixture (75% mass fraction ).the KCS11 is integrated with (500MW) subcritical coal fired steam power plant to assist power generation, the evaporation of (Ammonia -water ) mixture is accomplished by waste heat recovery of coal fired flue gases in the kalina cycle ,this process reduces the temperature of flue gases by (10k), a thermodynamic modeling algorithm is adopted to analyses the proposed system at different environmental conditions. Results show that the power generated from kalina (KCS11) cycle is increased from 389.51KW to 515.37 KW by integrating solar energy.…”

Section: E201mentioning

confidence: 99%

An Investigation of Hybrid Solar-Steam Power Plant: A case study in Iraq

Amori

Sari

2020

Journal of Petroleum Research and Studies

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In this work integrating Al-Zubaydia (Kut-Iraq) thermal power plant with solar thermal system is studied for heating feed water by solar energy to reduce fuel consumption and greenhouse gases emission. A closed type Parabolic Trough Solar Collector (PTSC) is designed, constructed, instrumented, and tested. Its thermal characteristics are reported under Iraq climate conditions for the period extended from June, to September 2017. The collector heat gain, efficiency, absorber temperature and heat exchanger effectiveness (considered as feed water heater) were presented for absorber side flow rates of (0.15, 0.2, 0.3, 0.4, 0.5) lpm of water or oil), and shell side water flow rates of (0.4, 0.5, 0.6lpm). Results show that the maximum obtained thermal efficiency of parabolic trough solar collector was 83.33% for oil working fluid. The maximum obtained oil outlet temperature was 106 oC at solar noon for (0.15) lpm. Theoretical results showed that the fuel save mode needs collector area of (32842 m2), while that needed for power boosting is (102569 m2) for the same thermal cycle efficiency. The fuel save mode reported a reduction in greenhouse emission.

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“…The cycle converts 289.5 kW of the existing heat energy to electric power. Goutam Khankari and Sujit Karmakar suggested that solar driven Kalina cycle system is energy efficient than standalone Kalina cycle system with an ammonia mass fraction of 0.76. The authors have concluded that am additional electric power has been generated from the integrated solar assisted Kalina cycle system with coal fired power plant.…”

Section: Introductionmentioning

confidence: 99%

Performance investigation in modified and improved augmented power generation Kalina cycle using Python

Maheswari

Ganesh

2019

Int J Energy Res

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SUMMARY In the generation of electricity and cogeneration, Kalina cycle is considered as one of the competitors to organic Rankine cycle. With the simplicity and identical components of the binary mixture, Kalina system makes it more prominent to get developed and implemented as well with its environmental friendly associate. This work proposes a new improved Kalina cycle system to convert the natural source from sun to useful work. The proposed system utilizes heat source suitable to medium temperature heat applications. The proposed cycle have 2 units of solar collector, favoring an additional heat recovery and higher performance. Solar hot source temperature and pressure are 190°C and 45 bar with additional flow to the turbine of 1.15 kg/s. Energy and second law analysis have considered in evaluating the performance of the proposed plant. The energy analysis shows minimum value of net power, energy efficiency and plant efficiency as 241 kW, 15.5% and 5.7. The exergy analysis defines that, to the proposed cycle, the exergy efficiency initializes at 77% with more exergy destruction at turbine with 31%. With the parametric analysis, the system is amended to have the maximum values of energy and exergy performances as 18.5%, 7.1% and 85%. The parametric study identifies the optimum value of the inlet temperature and pressure of the pump and turbine.

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Power generation from fluegas waste heat in a 500 MWe subcritical coal-fired thermal power plant using solar assisted Kalina Cycle System 11

Cited by 16 publications

References 18 publications

A novel solar assisted Kalina cycle system for waste heat utilization in thermal power plants

A novel solar assisted Kalina cycle system for waste heat utilization in thermal power plants

An Investigation of Hybrid Solar-Steam Power Plant: A case study in Iraq

Performance investigation in modified and improved augmented power generation Kalina cycle using Python

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