Novel multifunctional open absorption heat pump system with compressed air dryer assisted preliminary flash regeneration-An industrial application

Shahzad, Muhammad Kashif; Ding, Ya; Li, Qingpu; Xuan, Yingli; Gao, Neng; Chen, Guangming

doi:10.1016/j.applthermaleng.2022.118526

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…Так, в последние годы активно развиваются адсорбцион-ные технологии осушения воздуха и других газовых смесей с их предварительным сжатием [1][2][3][4][5][6], технологии обеспечения микроклимата в подземных и подводных объектах, биологических лабораториях и других помещениях с из-С быточным давлением [7,8]. Кроме того, определение характеристик сжатого влажного воздуха требуется при расчетах некоторых воздушных теплообменников, проектировании компрессорных станций, расчетах процессов сушки сжатым воздухом (холодная и горячая продувка) [9][10][11][12][13][14] и др.…”

Section: Introductionunclassified

Graphic Analytical Methods for Determining Moist Air Characteristics in Multistage Compressors

Didenko

Khvorenkov

Fakhraziev

2022

Vestnik IzhGTU imeni M.T. Kalashnikova

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The purpose of the study is a comparative analysis of methods for graphic analytical determination of the characteristics of moist air in multistage compressors. Two methods are compared, which differ in the used I-d-diagrams: unified in terms of pressure and atmospheric. I-d-diagrams unified in terms of pressure differ from atmospheric ones by diagrams of saturated air relative humidity () only at various pressures. For multistage compressors, curves are plotted on unified I-d-diagrams at atmospheric pressure and compressed air pressure in intercoolers and receivers. It is assumed that the isobaric cooling of compressed air and condensation of its water vapor occurs in coolers and receivers at the final compression pressure in the previous compressor stages. The method, which uses I-d-diagrams unified by pressure, involves the diagram plotting of air compression and cooling on a grid of curves. An example of plotting such diagrams for a two-stage compressor with an intercooler and a receiver is given. A detailed description of the thermodynamic state of moist air in such a compressor is given. The nodal points of the processes in the compressor are plotted on a pressure-unified I-d-diagram according to the known values of moisture content and air temperature. The pressure and temperature at the end points of compression are calculated by the equations of the polytropic process at n = 1.26. The dew points in the cooler and receiver are graphically defined as the intersection of the curves for the final compression pressures with the corresponding straight lines for constant air moisture content in the compressor stages. The technique using atmospheric (barometric) I-d-diagrams is used in the absence of unified I-d-diagrams suitable for pressure. The essence of the developed technique is to determine the curves on the atmospheric I-d-diagrams, graphically coinciding with the curves A numerical example of the application of such a technique is given. The advantages and disadvantages of both methods are evaluated.

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Section: Introductionunclassified

Graphic Analytical Methods for Determining Moist Air Characteristics in Multistage Compressors

Didenko

Khvorenkov

Fakhraziev

2022

Vestnik IzhGTU imeni M.T. Kalashnikova

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A review of compressors for high temperature heat pumps

El Samad,

Żabnieńska-Góra,

Jouhara

et al. 2024

Thermal Science and Engineering Progress

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Study on the Performance of a Novel Double-Section Full-Open Absorption Heat Pump for Flue Gas Waste Heat Recovery

Cai,

Wang,

Han

et al. 2024

Processes

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Open absorption heat pumps are considered one of the most promising methods for efficiently utilizing low-grade waste heat, reducing energy consumption, and lowering greenhouse gas emissions. However, traditional heat pumps have significant limitations in the range of flue gas temperatures they can recover, and their relatively low system performance further restricts practical applications. In this study, we propose a novel double-section full-open absorption heat pump driven by flue gas from the desulfurization tower. By designing the absorber with a double-layer structure, the system can recover more latent and sensible heat from the flue gas, significantly enhancing its thermal recovery capability. Additionally, replacing the traditional LiBr/H2O working pair with LiCl/H2O significantly reduces the risks of solution crystallization and equipment corrosion. Through comprehensive research, the strengths and weaknesses of the system were explored. The results indicate that this system effectively recovers flue gas waste heat within the temperature range of 30–70 °C. Specifically, at a flue gas temperature of 70 °C and a flow rate of 3 kg/s, the system achieves a COP of 1.838, along with a heating capacity of 158.83 kW and a ROI of 34.1%. These metrics demonstrate that the system not only delivers high performance but also exhibits excellent economic viability. Additionally, when the solution temperature is lowered to 10 °C, the system’s maximum COP reaches 1.96, reflecting a significant 30.67% improvement over traditional heat pumps. These findings highlight the system’s potential for application in coal-fired power plants, where varying levels of power output can benefit from enhanced thermal recovery and efficiency.

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Novel multifunctional open absorption heat pump system with compressed air dryer assisted preliminary flash regeneration-An industrial application

Cited by 3 publications

References 42 publications

Graphic Analytical Methods for Determining Moist Air Characteristics in Multistage Compressors

Graphic Analytical Methods for Determining Moist Air Characteristics in Multistage Compressors

A review of compressors for high temperature heat pumps

Study on the Performance of a Novel Double-Section Full-Open Absorption Heat Pump for Flue Gas Waste Heat Recovery

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