How to Construct a Combined S-CO2 Cycle for Coal Fired Power Plant?

Sun, Enhui; Han, Hu; Li, Hangning; Liu, Chao; Xu, Jinliang

doi:10.3390/e21010019

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…The fuel considered was the Taldinsky coal field, and its performance is disclosed in Table 1. Table 2 presents input data for the heat flow scheme analysis [24,25].…”

Section: Research Objectmentioning

confidence: 99%

Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

et al. 2021

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The Rankine cycle is widely used for electricity production. Significant weight and size characteristics of the power equipment working on superheated steam are the main disadvantages of such power plants. The transition to supercritical carbon dioxide (S-CO2) working fluid is a promising way to achieve a significant reduction in equipment metal consumption and to increase energy efficiency. This paper presents the results of thermodynamic analysis of S-CO2 thermal power plants (TPPs) utilizing the heat of combustion products of an energy boiler. It was found that the net efficiency of the developed S-CO2 TPP with a pulverized coal-fired boiler reached 49.2% at an initial temperature of 780 °C, which was 2% higher compared to the efficiency level of steam turbine power plants (STPPs) at a similar turbine inlet temperature.

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“…The fuel considered was the Taldinsky coal field, and its performance is disclosed in Table 1. Table 2 presents input data for the heat flow scheme analysis [24,25].…”

Section: Research Objectmentioning

confidence: 99%

Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

et al. 2021

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“…All these studies aimed at maximizing the thermal efficiency either by using a single cycle or a combined cycle. Sun et al [21] proposed a bottoming cycle for a coal-fired s-CO 2 power plant to effectively utilize the heat in the exhaust gases. They reported an efficiency of 47% with a double reheat recompression cycle with CO 2 parameters as 620 • C temperature and 30 MPa pressure.…”

Section: Introductionmentioning

confidence: 99%

System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

Manavalla,

M.,

Daniel

et al. 2023

Sustainability

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Super-critical Carbon dioxide (s-CO2) power plants are considered to be efficient and environmentally friendly compared to the traditional Rankine cycle-based steam power plants and Brayton cycle-based gas turbine power plants. In this work, the system design of a coal-fired 100 MWe double reheat s-CO2 power plant is presented. The system is also optimized for efficiency with turbine inlet pressures and the recompression ratio as the variables. The components needed, mass flow rates of various streams and their pressures at various locations in the system have been established. The plant has been studied based on 1st and 2nd laws at full load and at part loads of 80%, 60% and 40%. Operating parameters such as mass flow rate, pressure and temperature have considerably changed in comparison to full load operation. It was also observed that the 1st law efficiency is 53.96%, 53.93%, 52.63% and 50% while the 2nd law efficiency is 51.88%, 51.86%, 50.61% and 48.1% at 100%, 80%, 60% and 40% loads, respectively. The power plant demonstrated good performance even at part loads, especially at 80% load, while the performance deteriorated at lower loads. At full load, the highest amount of exergy destruction is found in the main heater (36.6%) and re-heaters (23.2% and 19.6%) followed by the high-temperature recuperator (5.7%) and cooler (4.1%). Similar trends were observed for the part load operation. It has been found that the recompression ratio should be kept high (>0.5) at lower loads in order to match the performance at higher loads. Combustion and heat exchange due to finite temperature differences are the main causes of exergy destruction, followed by pressure drop.

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“…For instance, flue gas from coal-fired power plant generally has temperature below 130 °C, and it contains 10–16% ( v / v ) water vapour [ 15 ]. To handle such condition, combined cycle for heat recovery or implementation of heat cascade may be necessary [ 16 ]. If recovered, the exhaust heat energy from flue gas can be used to reduce heat utilities in plants in expense of the additional capital costs for the energy harvesting infrastructure [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Membrane Distillation and Wet Scrubber for Simultaneous Recovery of Heat and Water from Flue Gas

Yusoff

Nyunt

Bilad

et al. 2020

Entropy

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Flue gas contains high amount of low-grade heat and water vapor that are attractive for recovery. This study assesses performance of a hybrid of water scrubber and membrane distillation (MD) to recover both heat and water from a simulated flue gas. The former help to condense the water vapor to form a hot liquid flow which later used as the feed for the MD unit. The system simultaneously recovers water and heat through the MD permeate. Results show that the system performance is dictated by the MD performance since most heat and water can be recovered by the scrubber unit. The scrubber achieved nearly complete water and heat recovery because the flue gas flows were supersaturated with steam condensed in the water scrubber unit. The recovered water and heat in the scrubber contains in the hot liquid used as the feed for the MD unit. The MD performance is affected by both the temperature and the flow rate of the flue gas. The MD fluxes increases at higher flue gas temperatures and higher flow rates because of higher enthalpy of the flue gas inputs. The maximum obtained water and heat fluxes of 12 kg m−2 h−1 and 2505 kJm−2 h−1 respectively, obtained at flue gas temperature of 99 °C and at flow rate of 5.56 L min−1. The MD flux was also found stable over the testing period at this optimum condition. Further study on assessing a more realistic flue gas composition is required to capture complexity of the process, particularly to address the impacts of particulates and acid gases.

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How to Construct a Combined S-CO2 Cycle for Coal Fired Power Plant?

Cited by 13 publications

References 33 publications

Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

Structural and Parametric Optimization of S-CO2 Thermal Power Plants with a Pulverized Coal-Fired Boiler Operating in Russia

System Design, Optimization and 2nd Law Analysis of a 100 MWe Double Reheat s-CO2 Power Plant at Full Load and Part Loads

Hybrid Membrane Distillation and Wet Scrubber for Simultaneous Recovery of Heat and Water from Flue Gas

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