A novel method for rotor profile optimization of high
            <scp>temperature screw</scp>
            expanders employed in waste heat recovery systems

Zhao, Zhaorui; Yuan, Hao; Tian, Yafen; Zhang, Hua

doi:10.1002/er.6392

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…3 The air compressor is one of the most important components in HFCVs, which provides the air with high pressure and large flow to the reactor, and thus increases the efficiency of fuel cells. 4 Among different promising compressor technologies, 5,6 the centrifugal air compressor has gained increasing attention due to its oilfree, compact structure, high-pressure ratio, and high speed. 7 However, gas foil thrust bearings are the key parts in the centrifugal air compressor to guarantee the system is oil-free and reliable due to there are self-acting, low drag power loss, and high speed.…”

Section: Introductionmentioning

confidence: 99%

“…The air compressor is one of the most important components in HFCVs, which provides the air with high pressure and large flow to the reactor, and thus increases the efficiency of fuel cells 4 . Among different promising compressor technologies, 5,6 the centrifugal air compressor has gained increasing attention due to its oil‐free, compact structure, high‐pressure ratio, and high speed 7 8,9 .…”

Section: Introductionmentioning

confidence: 99%

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Performance investigation and feasibility study of novel gas foil thrust bearing for hydrogen fuel cell vehicles

Shi

Huang

Chen

et al. 2022

Intl J of Energy Research

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Summary Centrifugal air compressors are promising due to their zero emissions, long driving range, and wide fuel sources. The gas foil thrust bearing (GFTB) is considered as one of the key components in the centrifugal air compressor to guarantee the system is oil‐free and reliable due to there is self‐acting and high speed. However, the gas foil thrust bearings were all of lower capacity in previous research. In this study, the effects of each foil and nominal clearance on the static performance are developed experimentally. The optimal GFTB with higher capacity is obtained. The feasibility study of the proposed GFTB is carried out, which is installed on the ultra‐high‐speed centrifugal air compressor. The result shows that the proposed GFTB can run stably and efficiently in the full speed ring, and the high‐pressure ratio and large flow rate of the air compressor also can be ensured. The results play an important role in guiding the stable operation of centrifugal air compressors applied in hydrogen fuel cell vehicles (HFCVs).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance investigation and feasibility study of novel gas foil thrust bearing for hydrogen fuel cell vehicles

Shi

Huang

Chen

et al. 2022

Intl J of Energy Research

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“…In steam compressors, the discharge temperature tends to be extremely high. 24 Large clearances must be reserved to prevent abrasion or machine failure caused by thermal deformation. Besides, the viscosity of water is much lower than oil.…”

Section: Introductionmentioning

confidence: 99%

Study on the leakage in water-injected twin-screw steam compressor

Tian

Yuan

Geng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Steam compressor shows great energy-saving potential in mechanical vapor compression and high-temperature heat pump systems. However, leakage remains a huge problem for compressor performance improvement and design optimization. In this article, a thermodynamic model with detailed leakage flow model was developed for the working process in water-injected twin-screw compressor. Altogether, leakage in different paths and heat and mass transfer between injected liquid and compressed vapor were considered. Compared with experimental results, the accuracy of predicted efficiency is within ± 5% for all tested operating conditions. In the validated model, leakage flow in five leakage paths and their effects on compressor efficiency was investigated. Results indicate that leakage can reduce volumetric efficiency by up to 50.2%, while the injected water liquid vaporization can improve volumetric efficiency by 7.9% at 5000 r·min−1. The leakage through contact line (CL), tip sealing (TS) line, and discharge end face (DE) show the most important impact on compressor efficiency, while the leakage through blow hole (BH) and suction end face (SE) has little impact on compressor efficiency. Compared with zero leakage under certain conditions, the reduction of volumetric efficiency caused by CL, TS line, and DE can reach up to 22.4%, 20.4%, and 12.7%, respectively. Reducing clearances of the above three leakage paths can efficiently improve the performance of steam compressor, especially for CL.

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Analysis of the Operational Characteristics and Performance Comparison of Steam Screw Pressure Matcher Based on Twin‐Screw Expander

Lin,

Lu,

Zhao

et al. 2024

Energy Science & Engineering

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To address the discrepancy between the steam parameters extracted by pure condensing units/combined heat and power units and those required by users, this paper introduces the design of a steam screw pressure matcher(SSPM) and determines its optimal steam supply scheme. The SSPM primarily comprises a twin‐screw expander (TSE), twin‐screw compressor(TSC), electric motor, and generator. Initially, models were developed for a 300‐MW subcritical intermediate reheat condensing steam turbine unit, an SSPM, and a desuperheater and pressure reducer(DPR). Subsequently, these models are incorporated into the Ebsilon Professional software to simulate the operational characteristics of the SSPM. The performance parameters of the two options are then compared and analyzed. Simulation results reveal that the operational characteristics of the SSPM closely correlate with the mass flow rate of the TSE. As the TSE mass flow rate varies from 47 to 91 t/h, the efficiency of the TSE declines from 66.3% to 65.3%, while the power performed by the SSPM increases from −2457.978 to 1558.469 kW. Under identical operating conditions, the SSPM scheme exhibits a 6.2%–12.4% improvement in efficiency compared to the DPR scheme. Building upon the aforementioned analysis, the SSPM demonstrates effective cascade utilization of heat steam energy and exhibits favorable regulation characteristics under variable operating conditions. Contrasted with traditional DPR, the SSPM notably mitigates constraints on steam extraction by boilers and enhances the maximum generation efficiency of a single unit.

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A novel method for rotor profile optimization of high temperature screw expanders employed in waste heat recovery systems

Cited by 6 publications

References 20 publications

Performance investigation and feasibility study of novel gas foil thrust bearing for hydrogen fuel cell vehicles

Performance investigation and feasibility study of novel gas foil thrust bearing for hydrogen fuel cell vehicles

Study on the leakage in water-injected twin-screw steam compressor

Analysis of the Operational Characteristics and Performance Comparison of Steam Screw Pressure Matcher Based on Twin‐Screw Expander

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