Simulated performance analysis of a solar aided power generation plant in fuel saving operation mode

Zhang, Nan; Hou, Haijun; Yu, Gang; Hu, Eric; Duan, Liqiang; Zhao, Jin

doi:10.1016/j.energy.2018.10.014

Cited by 30 publications

(13 citation statements)

References 24 publications

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“…Besides geothermal resources, solar thermal energy can also be used for preheating purpose, this kind of renewable preheating power system is termed as Solar Aided Power Generation (SAPG) technology [20]. Previous studies found that this kind of SAPG power system still have thermodynamic and economic advantages over solar alone power plants [21][22][23][24][25][26]. However, due to the intermittent nature of solar resources, a storage system is needed for the SAPG system [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of displacement selections and structures for the Geothermal Aided Power Generation plant

Zhou

Qin

2020

Preprint

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Geothermal Aided Power Generation (GAPG) technology is a method of integrating geothermal energy into a regenerative Rankine cycle (RRC) power plant. In such a power system, the geothermal energy is used to preheat the feedwater to boiler of the power plant. Therefore, the extraction steam of RRC power plant is displaced by the geothermal energy. Then, the displaced extraction steam is expended further in steam turbine to produce power. In a GAPG plant, a heat exchanger system is used to facilitate the heat exchange between the geothermal fluid and the feedwater. As power from geothermal energy comes from displaced extraction steam, different displacement selections for extraction steam would lead to different technical performance of the GAPG plant. When the geothermal fluid flows up from the geothermal well and quench to a lower temperature in the heat exchanger system, the silica scaling occurs in the heat exchanger system. As silica scaling can be controlled by adjusting geothermal fluid temperature, different displacement selections would have different influences on the silica scaling process in the heat exchanger system. There are two kinds of structures for the heat exchanger system of the GAPG plant, which are series structure and parallel structure. The different structures also lead to different performance of the GAPG plant. In present paper, a 300 MW GAPG plant is used as a case study to optimise displacement selections and structures of the GAPG plant. The results show that there is no silica scaling in the heat exchanger system for the displacement selection of geothermal energy to displace extraction to all high-pressure feedwater heaters. For this displacement selection, the power output of the Parallel GAPG plant is higher than the Series GAPG plant.

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Section: Introductionmentioning

confidence: 99%

Optimisation of displacement selections and structures for the Geothermal Aided Power Generation plant

Zhou

Qin

2020

Preprint

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“…The most immediate way is to reduce the fossil fuels use, and at the same time increase the proportion of renewable energy. [5][6][7][8][9][10] Many former researchers have conducted studies on the economic performance analysis or thermodynamic/exergy evaluation of a SAPG system. 3,4 Then the new technology, the synergetic power generation of traditional fossil fuel and renewable energy, emerges as the time require, and provides the possibility for the renewable energy utilization at low cost, high efficiency, and wild scope through the equipment sharing, and the good opportunity for the flexible operation by alternating between different energy resources.…”

Section: Introductionmentioning

confidence: 99%

“…Among these potential technical routes, the solar-aided coal-fired power generation (SAPG) has been proved to be a feasible and efficient hybridization way, from both the technical and economic aspects, and has been attracting more and more attentions in recent years. [5][6][7][8][9][10] Many former researchers have conducted studies on the economic performance analysis or thermodynamic/exergy evaluation of a SAPG system. Hu et al 2,11 reported the energy advantages and exergy advantages of a SAPG system based on a typical 500 MWe brown coal-fired power generation unit.…”

Section: Introductionmentioning

confidence: 99%

Multi‐objective optimization of solar‐aided coal‐fired power generation system under off‐design work conditions

Wang

Duan

Yang

et al. 2019

Energy Science & Engineering

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Solar‐aided coal‐fired power generation (SAPG) has been attracting more and more attentions in recent years. However, the multi‐objective optimization of SAPG system considering off‐design work conditions has not been fully studied. In this paper, a general system integration optimization method (GIOM) has been developed for integration schemes optimization, and Nondominated Sorting Genetic Algorithm‐II (NSGA‐II) algorithm is used for multi‐objective optimization of SAPG system. As a case study, a SAPG system that refers to a real 600 MWe supercritical coal‐fired power plant is optimized based on a typical day. By simultaneous optimization of both initial investment (P) and solar net electric generation (Esolar), the solar subsystem design schemes are optimized as Pareto optimal set. At last, to maximum Esolar/P, the final design scheme is selected from the Pareto optimal set, whose Esolar and P are 237.6 MWh and 113.5 M$, respectively. The results show that, the final design scheme is a heliostat field with instantaneous optical efficiency of 63.24% at the design point, the receiver power rating is 133 MWt, the tower height is 136.6 m, and distances of successive rows of the three zones are 13.6, 17.7, and 24.5 m, respectively. A larger or smaller size of solar subsystem is considered to be uneconomical.

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“…Zhang et al established a 330 MW SAPG model and analyzed the dynamic performance of the unit and the dynamic response of the main parameters under typical weather conditions. When the heat output of the solar field reached 2.13 × 10 8 kJ/h, the coal saving rate increased by 6.4% . Based on TRNSYS software, Duan et al established a tower solar collector‐aided coal‐fired power generation system model, and the maximum annual solar‐to‐electricity efficiency was 16.74%, the levelized cost of electricity (LOCE) of the solar‐aided coal‐fired power plant is reduced from 301.5 g/kWh to 294.5 g/kWh compared with coal‐fired power plant …”

Section: Introductionmentioning

confidence: 99%

“…When the heat output of the solar field reached 2.13 × 10 8 kJ/h, the coal saving rate increased by 6.4%. 22 Based on TRNSYS software, Duan et al established a tower solar collector-aided coal-fired power generation system model, and the maximum annual solar-to-electricity efficiency was 16.74%, the levelized cost of electricity (LOCE) of the solar-aided coal-fired power plant is reduced from 301.5 g/kWh to 294.5 g/kWh compared with coal-fired power plant. 23 However, there are more difficulties in the operation of the hybrid system.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics of a solar‐aided coal‐fired power generation system under direct normal irradiance (DNI) feedforward control

Pang

Duan

et al. 2019

Energy Science & Engineering

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A solar‐aided coal‐fired power generation (SAPG) system is a new type of power generation system in the field of solar thermal power generation. However, the instability of solar radiation will cause fluctuations in steam temperature, which is unfavorable for the operation of boilers and steam turbines. Based on a 600 MW subcritical coal‐fired power generation unit, TRNSYS software is applied to establish a transient simulation model of SAPG in this paper. A dynamic feedforward control system for steam temperature is set up. Some essential parameters, such as the fuel consumption rate, solar‐heated steam extraction rate, water spraying flow rate, and flue gas damper opening, are under the control of direct normal irradiance (DNI). Then, the dynamic characteristics of SAPG are analyzed using typical weather data. The simulation results show that under the fuel‐saving mode, when solar irradiation changes, the SAPG system achieves a coal reduction of 4.9% by using the steam temperature control system with DNI feedforward control, and the main steam temperature fluctuation is less than 5°C with the reheat steam temperature reduced within a reasonable range. The power generation fluctuation is less than 10 MW, and the solar‐to‐electricity efficiency reaches 22.5%. Some parameters on both the flue gas side and the water/steam side in the utility boiler are simulated to demonstrate the effectiveness of DNI control.

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Simulated performance analysis of a solar aided power generation plant in fuel saving operation mode

Cited by 30 publications

References 24 publications

Optimisation of displacement selections and structures for the Geothermal Aided Power Generation plant

Optimisation of displacement selections and structures for the Geothermal Aided Power Generation plant

Multi‐objective optimization of solar‐aided coal‐fired power generation system under off‐design work conditions

Dynamic characteristics of a solar‐aided coal‐fired power generation system under direct normal irradiance (DNI) feedforward control

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