Research On The On-line Analysis System Of Sample Pressurized From Submarine Hydrothermal Mine

Recently, extensive studies have been focused on the exploitation of deep-sea mineral resources in developed countries. And hydrothermal deposit also belongs to such category. Through analyzing the gas bubbling off from samples collected from hydrothermal vents, we can obtain a reliable clue to the distribution and composition of mines in deep-sea. Therefore this work makes great sense for submarine mineral exploration.After investigating some similar work at home and abroad, and taking into account the specification of this 863-funded project, we first proposed three schemes for building a system for the sample analysis work in the thesis. Then we compared the three schemes, of which the system analyzing the sample by the means of pressure degraded descending turns out to be the most feasible one for our project, thereby we built up one such equipment according to this methodology. The thesis is composed of sections as follows: introduction, system modeling and simulation, investigation on key techniques, hardware design, experiment, conclusion and prospect, achievements and so on.In the introduction section, the significance of studying deep-sea resources is highlighted, and especially the hydrothermal deposit resource in deep-sea is elaborated on. We also analyze the current progress made on the exploration and analysis of hydrothermal deposit resource at home and abroad. Then the source, aim and content of the project are presented.System modeling and simulation verifies the feasibility and rationality of the selected scheme. We were engaged on simulating the process of descending pressure slowly with the software of MATLAB, and structural parameters which affect the velocity of pressure descended were found out based on the result of simulation. After optimizing the parameters, we achieved satisfying simulation curves. Then the meaning of descending pressure slowly is pointed out, as well as its implementation method.Key techniques relative to the system mainly consist of descending pressure slowly (i.e. not suddenly), seal technique, pollution resisting, interface technique, gas collecting, corrosion resisting and so on.We detail the structure, working process and design specification of the system in the section of hardware design. We built up the experiment platform and the equipments in charge of degraded descending pressure, making vacuum, collecting...