Research on a Temperature Control Device for Seawater Hydraulic Systems Based on a Natural Gas Hydrate Core Sample Pressure-Retaining and Transfer Device

Peihao Zhang, Jiawang Chen, Qiaoling Gao, Bo Xiao, Xueqiao Geng and Peng Zhou
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Peihao Zhang: Ocean College, Zhejiang University, Zhoushan 316021, China
Jiawang Chen: Ocean College, Zhejiang University, Zhoushan 316021, China
Qiaoling Gao: Ocean College, Zhejiang University, Zhoushan 316021, China
Bo Xiao: Guangzhou Marine Geological Survey, Guangzhou 510075, China
Xueqiao Geng: Guangzhou Marine Geological Survey, Guangzhou 510075, China
Peng Zhou: Ocean College, Zhejiang University, Zhoushan 316021, China

Energies, 2019, vol. 12, issue 20, 1-20

Abstract: In the study of natural gas hydrates, the maintenance of the low-temperature and high-pressure state of the core sample under in situ conditions is highly important for cutting, transferring, and subsequent analysis. The pressure maintenance and temperature control device (PMTCD) for natural gas hydrate core samples described in this paper is a subsystem of the pressure-retaining and transfer device. The device consists of a water tank, seawater chillers, a plunger pump and a thermoelectrical refrigeration device. The device cools the seawater to 2 °C, and then pressurizes it to inject it into the sample cylinder. Due to the inevitable heat generated by the pressurization and heat exchange with environment, there is a thermoelectrical refrigeration device to compensate for temperature rise. Finally, the seawater temperature entering the sample cylinder is no higher than 3 °C, effectively preventing the decomposition and deterioration of the natural gas hydrate core in the sample cylinder. In this paper, the temperature increase of the device and its compensation capacity are analyzed in detail on the basis of calculation and simulation. On the basis of testing with the device, it is verified that even at the ambient temperature, the water temperature can still be maintained at 3 °C.

Keywords: natural gas hydrate; core sample; temperature control; hydraulic system temperature rise; chiller; thermoelectrical refrigeration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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