Analysis and testing of a superconducting maglev submersible cryogenic liquid pump

Ai, Liwang; Zhang, Guomin; Xu, Xiaozhuo; Feng, Haichao; Cao, Wenping

doi:10.1049/elp2.12171

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…With the continuous advancement of science and technology, cryogenic technology is widely utilized across various industries such as shipbuilding, aerospace, thermonuclear fusion, and defense. Cryogenic liquid pumps have broad applications, including the transportation of liquefied natural gas and liquid hydrogen [6]. Among them, the emergency pump is a pump used to unload LNG from LNG carriers to onshore terminals in exporting countries in the event of abnormal or malfunctioning conditions in the main cargo pump.…”

Section: Introductionmentioning

confidence: 99%

Design of 200 kW Cryogenic Induction Motor for Liquefied Natural Gas Emergency Pump

Hong,

Lee

2024

Energies

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This paper presents a design study focusing on the thermal safety of an induction motor integrated with a pump unit, which operates submerged in liquefied natural gas (LNG) in the LNG tanks of LNG carrier ships ranging from 150 K to 200 K cubic meters (CBM). In this study, we carried out the electromagnetic design of the induction motor and verified the thermal safety against a temperature increase due to losses during the motor operation through thermal fluid analysis, taking into account the discharge flow of the emergency pump and the air gap of the motor. In the electromagnetic design, the resistivity of the stator winding copper conductors and the rotor aluminum bars, which act as important design constants for the rated operating and starting characteristics of the induction motor in cryogenic temperature environments, reflects the characteristic of linearly changing with the temperature. In cryogenic environments, the reduction in the resistance of the rotor bars of the induction motor leads to a decrease in the starting torque characteristics. Therefore, the shape optimization design of the rotor bar was performed to improve the starting torque characteristics, and 2D electromagnetic analysis was performed on the magnetic flux density distribution and magnetic saturation using Ansys Electromagnetics 16.0. After the electromagnetic design, a 3D thermal flow analysis was conducted using Ansys Fluent 17.0, considering the stator iron losses, rotor bar losses, stator and rotor iron losses, and stray load losses as heat sources. The flow analysis aimed to analytically verify the thermal safety concerning the vaporization of the LNG flowing through the emergency pump’s discharge flow path and the motor’s internal air gap. The motor was manufactured, and the rated and starting operating characteristics of the motor were measured under LN2 submerged conditions according to the IEEE 112 F1 method, to validate whether the performance characteristics met the specifications’ requirements. Subsequently, the thermal safety of the motor was finally verified through a temperature increase test under LNG submerged conditions after assembling it with the emergency pump.

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Section: Introductionmentioning

confidence: 99%

Design of 200 kW Cryogenic Induction Motor for Liquefied Natural Gas Emergency Pump

Hong,

Lee

2024

Energies

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Modelling and analysis of a superconducting magnetic coupler used for cryogenic pump

Ai,

Ma,

Miao

et al. 2024

IET Electric Power Appl

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It is difficult to achieve low heat leakage and leak‐free rotary sealing for conventional small‐ and medium‐sized cryogenic liquid pumps (CLPs). This is because the motor in a room‐temperature environment is connected to the pump impeller (in a cryogenic environment) via a long transmission shaft. An axial flux‐concentration superconducting magnetic coupler (AFCSMC) is proposed for CLP to eliminate the transmission shaft. Firstly, the structure and the operation mechanism of AFCSMC are described. Then, a 2D electromagnetic modelling method for AFCSMC is established based on the H‐φ formulation and also validated experimentally in terms of the prediction on the levitation force and the guidance force. Thus, the 2D numerical simulations of AFCSMC are performed in an equivalent static system instead of the actual double rotor motion system in which the moving mesh is quite complicated. It is investigated that dependences of the transmission torque on the key electromagnetic structural parameters, such as permanent magnet arrangement, number of pole‐pairs, ferromagnetic yoke, operating slip, and so on. The results indicate that the average transmitting torque is less affected by the operating slip, and AFCSMC can start asynchronously and operate in steady state with a synchronous speed. With the advantages of low loss, risk‐free of desynchronising, and overload protection, the proposed AFCSMC can provide a competitive candidate for mechanical power transmission technologies in cryogenic engineering.

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Analysis and testing of a superconducting maglev submersible cryogenic liquid pump

Cited by 2 publications

References 27 publications

Design of 200 kW Cryogenic Induction Motor for Liquefied Natural Gas Emergency Pump

Design of 200 kW Cryogenic Induction Motor for Liquefied Natural Gas Emergency Pump

Modelling and analysis of a superconducting magnetic coupler used for cryogenic pump

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