A total heat recovery system between the flue gas and oxidizing air of a gas-fired boiler using a non-contact total heat exchanger

Shang, Sheng; Li, Xianting; Chen, Wei; Wang, Baolong; Shi, Wenxing

doi:10.1016/j.apenergy.2017.05.169

Cited by 58 publications

(13 citation statements)

References 18 publications

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“…The maximal error between the calculated t dp and experimental data is 1.21%, which exhibits the accuracy of calculation of t dp . Calculation model of waste heat is compared with the flue gas enthalpy in Shang et al 15 There is a little error between the calculated results and referred data as shown in Figure 4, but it is acceptable considering the assumptions and simplifications in this work. Table 2 exhibits the initial operating parameters of three systems.…”

Section: Validationmentioning

confidence: 95%

“…Lee et al 13 proposed a novel integrated boiler, and this boiler reused the exhaust gas and condensed water, so it could achieve higher efficiency and lower emission of waste heat than the previous. Shang et al 15 proposed a new WHR system for the gas-fired boiler, which uses the heat and vapor in flue gas to preheat and humidify the air at the same time. Shang et al 15 proposed a new WHR system for the gas-fired boiler, which uses the heat and vapor in flue gas to preheat and humidify the air at the same time.…”

Section: Improvement Strategy For Whr Systemmentioning

confidence: 99%

“…[13][14][15] It was found that the increasing air humidity could improve the WHR system performance, reuse some condensate fluid, and reduce the emission of acid gas. [13][14][15] It was found that the increasing air humidity could improve the WHR system performance, reuse some condensate fluid, and reduce the emission of acid gas.…”

Section: Effect Of Air Humidity (γ) On Boiler Efficiencymentioning

confidence: 99%

“…Another WHR boiler with air pre-humidification was developed by Lee et al 14 It performs higher boiler efficiency and less NO x emission than WHR boilers thanks to the air humidifying. Shang et al 15 proposed a new WHR system for the gas-fired boiler, which uses the heat and vapor in flue gas to preheat and humidify the air at the same time. A novel-integrated WHR system for coal-fired system was designed by Liu et al 16 In this system, some waste heat of flue gas is used to preheat air, and the other is used as the heat source for supercritical CO 2 cycle.…”

Section: Improvement Strategy For Whr Systemmentioning

confidence: 99%

“…Moist air for boiler system has been discussed in the previous studies. [13][14][15] It was found that the increasing air humidity could improve the WHR system performance, reuse some condensate fluid, and reduce the emission of acid gas. Figure 5 depicts the variations of boiler efficiency (η b ) with different relative humidity of air (γ air ) as a function of flue gas temperature (t fg ).…”

Section: Effect Of Air Humidity (γ) On Boiler Efficiencymentioning

confidence: 99%

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Analysis of two‐stage waste heat recovery based on natural gas‐fired boiler

et al. 2019

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Summary Waste heat recovery (WHR) is crucial to the efficiency improvement of natural gas‐fired boiler systems. Two‐stage WHR systems based on the natural gas‐fired boiler were analyzed from the viewpoints of thermal efficiency and heat transfer irreversibility. An overall entransy dissipation‐based thermal resistance was derived to evaluate the irreversibility of WHR, including the entransy dissipations during condensation and in absorption heat pump (AHP). Compared with the basic WHR system, the two‐stage WHR systems have higher boiler efficiency and less irreversibility. The air‐humidified system recycles both the heat and vapor in flue gas, while the unutilized latent heat in the recovered vapor causes the boiler to be less efficient than the AHP system. Investigation on heat exchanger effectiveness of two‐stage WHR systems illustrated: in the two‐stage WHR system with air humidification, the increasing effectiveness of both heat exchangers could effectively increase boiler efficiency and reduce heat transfer irreversibility. In the two‐stage WHR system with AHP, boiler efficiency has a local optimum when the dew point occurs near the outlet of the first heat exchanger; increasing the second heat exchanger effectiveness is more efficient in improving boiler efficiency. The present work may provide available references and guidance for the design and optimization of the two‐stage WHR systems.

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Section: Validationmentioning

confidence: 95%

Section: Improvement Strategy For Whr Systemmentioning

confidence: 99%

Section: Effect Of Air Humidity (γ) On Boiler Efficiencymentioning

confidence: 99%

Section: Improvement Strategy For Whr Systemmentioning

confidence: 99%

Section: Effect Of Air Humidity (γ) On Boiler Efficiencymentioning

confidence: 99%

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Analysis of two‐stage waste heat recovery based on natural gas‐fired boiler

et al. 2019

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Analysis of thermal and water equilibrium and desulfurization efficiency after waste heat recovered from a wet flue gas desulfurization system

Jiang

Yang²,

Feng³

et al. 2020

Asia-Pacific J Chem Eng

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Waste heat recovery for wet flue gas desulfurization (WFGD) system is quite necessary so that both heat and water consumption can be saved. However, formerly, there existed no clear concept about the upper limit quantity of waste heat that can be recovered for a target WFGD system, and where the final operation status of WFGD system after waste heat recovered will be located is also absent. Therefore, in the current paper, a methodology is developed first to simulate the magnesium method desulfurization system with circulating water considered using Aspen Plus V8.4. After validation, the methodology with slight modification is then used to investigate the theoretical maximal quantity of waste heat that can be recovered under different conditions and study the corresponding variation tendencies of updated thermal and water equilibrium states. Desulfurization efficiency is also discussed qualitatively. Results indicate that there exist maximal 1.41 to 2.27 MW heat that can be recovered at WFGD system for an 80 t/hr coal‐fired boiler, equivalent to save standard coal from about 1,385 to 2,230 t/a. All the streams temperature are reduced after recovering waste heat, but different streams behave different variation tendency. Water consumption and desulfurization efficiency also could get improved.

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Performance evaluation of an improved biomass-fired cogeneration system simultaneously using extraction steam, cooling water, and feedwater for heating

Pan

Chen

2021

Front. Energy

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A total heat recovery system between the flue gas and oxidizing air of a gas-fired boiler using a non-contact total heat exchanger

Cited by 58 publications

References 18 publications

Analysis of two‐stage waste heat recovery based on natural gas‐fired boiler

Analysis of two‐stage waste heat recovery based on natural gas‐fired boiler

Analysis of thermal and water equilibrium and desulfurization efficiency after waste heat recovered from a wet flue gas desulfurization system

Performance evaluation of an improved biomass-fired cogeneration system simultaneously using extraction steam, cooling water, and feedwater for heating

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