By selecting a suitable PCM whose melting temperature lies between the saturated steam temperatures of the lower and upper operating pressure of the Ruths
An advanced cogeneration system based on biomass direct combustion was developed and its feasibility was demonstrated. In place of the traditional single heat source (extraction steam), the extraction steam from the turbine, the cooling water from the plant condenser, and the low-pressure feedwater from the feedwater preheating
Moreover, at a thermal storage temperature of 353.1 K, T-CO 2 energy storage cycle achieves a round-trip efficiency of 61.37% and an energy storage density of 0.989 kWh/m 3. The results indicate that the combined system exhibits excellent performance, particularly under relatively lower thermal source temperature.
Several studies have revealed the affordability and better efficiency of SAPG technology. Hu et al. utilized solar thermal energy as a substitute heater in the extraction steam of a regenerative
Performance evaluation of an improved biomass-fired cogeneration system simultaneously using extraction steam, cooling water, and feedwater for heating.
Wang et al. [20] proposed integration modes that extract the main or reheated steam to store energy and loop steam back to the low-pressure turbine. Results indicated that the minimum power load of the CFPP can be decreased from 30% to 14.23%.
Extraction of main steam dominates the peaking rate and cycling efficiency compared to extraction of reheat steam. Increasing the main steam pressure at the ejector inlet increases the low peaking rates by 1.5 %, while reducing the molten salt flow rate per unit peaking depth by 10 t/h, which is essential for the stable operation of the retrofitted system.
Here, we compared the use of medium temperature (200–300 C) energy from concentrating solar collectors (e.g. parabolic trough collectors) to displace the extraction steam to high temperature
The extraction steam, which is used to preheat feedwater, is replaced/adjusted and expended further in the steam turbine to generate power. The
Impact of thermal energy storage system on the Solar Aided Power Generation plant with diverse structure and extraction steam operation strategy. Jiyun
The results show that the round-trip efficiency and the energy storage density of the compressed air energy storage subsystem are 84.90 % and 15.91 MJ/m 3, respectively. The exergy efficiency of the compressed air energy storage subsystem is 80.46 %, with the highest exergy loss in the throttle valves.
The extraction steam, bleeding from steam turbine to preheat the feedwater, has been displaced by integrated solar heat, and extra output from these extraction steam would be generated. This means that the solar thermal to power efficiency of the SAPG plant is no longer capped by solar thermal fluid temperature, but rather by
The steam extraction ratio of the live steam restricted by the mass flow constraint and the reduction of the mass flow rate of the reheat steam can be acquired by
The results indicated that with simple main steam and re-heat steam energy storage plan, the storage efficiencies are 39.4-42.9% and 51.3-51.4%, the minimum operation load would decrease by 27.2
This proposal examines the potential to use abandoned mine shafts for interseasonal storage of curtailed wind energy in the form of thermal energy. In 2020, wind curtailment payments in the UK were £282M: enough to power 1.25 million homes and equivalent to £4 per MWh of energy generated.
Semantic Scholar extracted view of "Performance and economic analysis of steam extraction for energy storage to molten salt with coupled ejector and thermal power units" by Xiang Liu et al. DOI: 10.1016/j.est.2023.108488 Corpus ID: 260817662 Performance and
Hebei Longshan Extraction Molten Salt Energy Storage Project Commences. Seetao 2023-07-06 15:04. Provide technical reference for significantly improving peak shaving capacity of existing coal-fired power units nationwide. After the completion of the project, it can effectively promote the development of new energy and
Besides extraction steam operation strategies, two possible non-replaced extraction steam strategies have also been proposed, which are constant temperature and constant flow rate [26], [27]. It was found that the optimal strategy is dependent on the annual solar heat input [26], [27].
A new thermal power unit peaking system coupled with thermal energy storage and steam ejector was proposed, which is proved to be technically and economically feasible based
The integration of thermal storage into steam plant can be traced back as far as the 1890s, as described in the accounts by Gilli & Fritz 8 and Gilli et al. 9 Early designs involved oversizing the boiler drum such that it served as an integrated accumulator, but the advent of the sliding-pressure (Ruth''s) accumulator in 1913 allowed stand-alone
When the thermal energy extraction location is set at the HPT inlet, as depicted in Fig. 4 (a) and (b), the main steam (538 C, 6.33 MPa) is extracted to the ME1 to store thermal energy. After that, the extraction steam flows into the condenser under mode MtCON or flows into the LPT under mode MtLP.
A detailed dynamic simulation model for a coal-fired power plant is developed. • The integration of a steam accumulator into the water-steam cycle is presented. • Charging the energy storage leads to a (minimum) load reduction of up to 7.0%. • Discharging the
This chapter presents the recent research on various strategies for power plant flexible operations to meet the requirements of load balance. The aim of this study is to investigate whether it is feasible to integrate the thermal energy storage (TES) with the thermal power plant steam-water cycle. Optional thermal charge and discharge locations
DOI: 10.1016/j.applthermaleng.2022.119801 Corpus ID: 254388902 Impact of thermal energy storage system on the Solar Aided Power Generation plant with diverse structure and extraction steam operation strategy
Here, we compared the use of medium temperature (200–300 C) energy from concentrating solar collectors (e.g. parabolic trough collectors) to displace the extraction steam to high temperature
Steam extraction and thermal energy storage could enable power output adjustment without changing the firing rate in the boiler. Thus, retrofitting existing coal-fired power plants with steam
In order to provide more grid space for the renewable energy power, the traditional coal-fired power unit should be operated flexibility, especially achieved the
One is by directly throttling extraction steam (TES) at the extraction steam pipelines, and the other is by indirect feedwater bypass (FWB). The dynamic characteristics under the following five measures, which were all conducted at 30 s, were investigated based on the 75% THA working condition.
Then, the energy storage coefficient of 0.105 MW/kg/s is obtained through the model simulation instead of a complex thermodynamic calculation, corresponding to the 113.22 GJ energy storage
Deng et al. [33] quantitatively analyzed the energy storage of power plants, and indicated that boiler energy storage is highest in the available energy storage. Gao et al. [ 34 ] provided a new coordinate control strategy considering the energy storage of the boiler side to enhance the quick load change capability.
DOI: 10.1016/J.APPLTHERMALENG.2021.117226 Corpus ID: 236242523 Research on influence of steam extraction parameters and operation load on operational flexibility of coal-fired power plant In order to provide more grid space for the renewable energy power
For combined heat and power (CHP) plant, molten salt thermal energy storage (TES) can be added to improve the flexibility to meet the needs of peak shaving.
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