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Design of sampler and associated transfer device of interface between sediment and overlying water |
Jin GUO( ),Jia-wang CHEN*( ),Hao WANG,Ying WANG,Wei WANG,Yu-ping FANG,Peng ZHOU |
Ocean College, Zhejiang University, Zhoushan 316021, China |
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Abstract A 3000 m-class sediment including overlying water pressure-retaining sampler based on heavy-duty remote operated vehicle (ROV) robotic operation and transfer derice matched with the sampler were proposed aiming at the calculation of the leakage flux in the methane leakage area, sample gas composition loss, microbial mortality and organic component decomposition caused by non-pressure-retaining non-gas-tight sampling device. The sampler could achieve low disturbance in the situ packaging of samples. The transfer device realized the separation of overlying water and the transfer of sediment to different incubators under the pressure-retaining condition. The pressure-retaining transfer device transferred the overlying water by compressing the internal volume and transferred the sediment by secondary sampling based on the threshold pressure adjustable relief valve. The results showed that the sampler obtained more than 700 mL pressure-retaining samples in each of the three sea trials in the South China Sea and the pressure drop of sampler was only 1.53 MPa in the 3 000 m sea trial. The sampling rate and the pressure retaining capacity of the sampler were verified in the sea trial. The transfer device completed the transfer of sediment and overlying water separation under 30 MPa high pressure conditions and kept the pressure fluctuation not more than 4.8% during the transfer process. The pressure in the culture kettle decreased only 4.7% relative to the pressure in the sampler after the transfer was completed.
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Received: 08 October 2022
Published: 09 May 2023
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Fund: 国家自然科学基金资助项目(42276191); 海南省财政科技计划资助项目(ZDKJ202019) |
Corresponding Authors:
Jia-wang CHEN
E-mail: gojin@zju.edu.cn;arwang@zju.edu.cn
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沉积物上覆水界面取样器及配套转移装置设计
针对甲烷渗漏区渗漏通量的计算、非保压非气密取样设备导致的样品气体散失、微生物死亡和有机成分分解等问题,设计一种基于重载遥控无人潜水器(ROV)机械手操作的3 000 m级沉积物含上覆水保压取样器,以及与取样器配套的保压分离转移装置. 该取样器可以实现样品的低扰动原位封装. 在保压的工况下,转移装置可以实现上覆水的分离以及沉积物至不同培养釜的转移. 基于阈值压力可调的泄压阀,保压转移装置通过压缩内部体积转移上覆水和通过二次取样转移沉积物. 结果表明:取样器在南海的3次海试中分别获得了超过700 mL的保压样品,在3 000 m的海试中2 h压降仅为1.53 MPa,海试验证了取样器的取样率及保压能力. 在30 MPa高压工况下,转移装置完成了沉积物及上覆水分离转移,在转移过程中保持压力波动不超过4.8%. 在转移完成后,培养釜中样品的压力相对于取样器中的样品初始压力下降仅为4.7%.
关键词:
甲烷渗漏,
沉积物,
上覆海水,
保压取样,
保压转移,
海试
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