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

Cui, Xinying; Zhang, Haiyan; Guo, Jin; Huai, Xiulan; Xu, Min

doi:10.1002/er.4785

Cited by 9 publications

(7 citation statements)

References 48 publications

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“…Boilers consume natural gas and convert it to heating by proficiency. 51 This is shown by (3a). In addition, the BO boiler generation is limited to the minimum and maximum values presented by (3b).…”

Section: The Constraints Related To the Boilermentioning

confidence: 78%

Optimal planning of multi‐energy microgrid with different energy storages and demand responsive loads utilizing a technical‐economic‐environmental programming

2020

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This article proposes a planning model for a multi-energy microgrid (MEM) that supplies the electricity, heating, and cooling loads. This controls flexible demands and provides continuous control in the presence of smart and comprehensive programming of electricity, heat, ice, compressed air, and hydrogen energy storage. The features of the MEM are considering the losses and amortization costs of electricity, heating and cooling energy storage, and the operating area of the combined heat and power (CHP) units in the planning procedure. Besides, the principle of convexity in the CHP unit operation area is attended. The proposed formulation is applicable in days of summer and winter seasons for a variety of planning studies. The outcomes represent that utilizing the proposed MEM planning results in significant advantages for the power network and the consumer. The cost savings are respectively obtained equal to 33% and 34% in the winter and summer seasons. The cost savings can be considered besides the investiture cost of MEM elements to specifying the MEM profits made during the designing step. Another valuable result is the cost-saving of PHEV smart charge about 1.38 times of PHEV smart discharge for summer and about 1.05 for winter. It also makes the curve of demand optimal utilization from the demand response program and energy storage plan. K E Y W O R D S combined heat and power (CHP), demand response, energy planning, energy storage, multienergy microgrid (MEM), plug-in hybrid electric vehicle (PHEV)

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Section: The Constraints Related To the Boilermentioning

confidence: 78%

Optimal planning of multi‐energy microgrid with different energy storages and demand responsive loads utilizing a technical‐economic‐environmental programming

2020

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“…On the basis of the lower heating value of natural gas (36740 kJ/Nm 3 ), boiler efficiency is calculated by using the following equation:

η_{Boiler} = \frac{italicLHV + H_{g} + H_{a} + m_{cw} \int_{t}^{t_{dp}} r ((), t) - H_{fg}}{LHV}

where H g , H a , and H fg are the enthalpies of natural gas, air, and flue gas, respectively, while m cw is condensed water mass, and r stands for the latent heat of condensed water on the basis of dew point of the flue gas.…”

Section: Methodsmentioning

confidence: 99%

“…The saturated pressure of water vapors can be obtained from the Antoine expression:

P_{s} = 133.18 \exp ((), 18.3036 - \frac{3816.44}{273.15 + t - 46.13})

…”

Section: Methodsmentioning

confidence: 99%

“…On the basis of the lower heating value of natural gas (36740 kJ/Nm 3 ), 28 boiler efficiency is calculated by using the following equation 29 :…”

Section: Boiler Modelmentioning

confidence: 99%

“…Kang et al used the geothermal heat source assisted heat pump for domestic heating/cooling with the capability of electricity production through gas turbines. Cui et al presented a performance analysis of a newly proposed two‐stage waste heat recovery (WHR) system to capture low‐grade waste heat. Li et al presented a case study to recover the waste heat from a 300‐MW steam turbine using water and air‐cooled condensing units.…”

Section: Introductionmentioning

confidence: 99%

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Techno‐economic analysis of a novel hybrid heat pump system to recover waste heat and condensate from the low‐temperature boiler exhaust gas

2020

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Summary This paper is based on the proposal of a new waste heat recovery (WHR) system, which can be utilized to heat the boiler return water, boiler supply air, and building heating air. The system is the combination of an indirect contact condensing unit (IDCCU), a mechanical compression heat pump, and two air preheaters. The system is modeled on the basis of mass and energy balance and then thermodynamically analyzed. Improved performance results were obtained in the form of an increase in the boiler's energy efficiency of about 10.47%, with 4.87% increase in exergy efficiency. The coefficient of performance (COP) of the heat pump was increased from 1.23 to 1.45 by the addition of an air heater in the conventional heat pump. The exergy destruction in each component is calculated. Sensitivity analysis was performed to check the influence of different operating parameters on the performance of the WHR system and boiler. It can be observed from the results that for a specific refrigerant temperature and a calculated amount of mass, flow rate can maximize the condensation efficiency of IDCCU by decreasing the flue gas temperature, while the use of the air heater can further reduce the flue gas temperature, and a stream of hot air can be utilized for space heating. A comparison is made with the other system on a performance basis. The results shows a clear difference in efficiencies and profit earned.

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A review of boiler waste heat recovery technologies in the medium-low temperature range

Men

Liu

Zhang

2021

Energy

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

Cited by 9 publications

References 48 publications

Optimal planning of multi‐energy microgrid with different energy storages and demand responsive loads utilizing a technical‐economic‐environmental programming

Optimal planning of multi‐energy microgrid with different energy storages and demand responsive loads utilizing a technical‐economic‐environmental programming

Techno‐economic analysis of a novel hybrid heat pump system to recover waste heat and condensate from the low‐temperature boiler exhaust gas

A review of boiler waste heat recovery technologies in the medium-low temperature range

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