Patent ID: 11946007
Assignee: PEKING UNIVERSITY
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 9:
10. A method of use of the natural gas separation and purification and mercury collection system in oil and gas wells according to claim 1, comprising the following steps:
S1: gas collection: vacuuming the cyclone separator, the condensation purification and separation mechanism, the pressure buffer mechanisms, the mercury collection and separation mechanisms, and the natural gas storage tanks; driving, after the vacuuming, the electric heating wire of the mercury collection and separation mechanism to heat the gold foil meshes to 500-700° C., and holding the temperature for 3-5 min; cooling, after the holding, the gold foil meshes naturally to room temperature; conducting, by the pressure buffer mechanism, a pressure regulation on high-pressure natural gas collected from an oil or gas well, and delivering the regulated natural gas to the cyclone separator; and separating, by the cyclone separator, a solid particle and a liquid droplet in the natural gas to generate gaseous natural gas as initial experimental gas;
S2: gas purification: conducting, by the pressure buffer mechanism, a secondary pressure regulation on the experimental gas generated in step S1; delivering, after the secondary pressure regulation, the experimental gas to the condensation purification and separation mechanism; condensing, by the condensation purification and separation mechanism, an impurity in a vaporous form in the experimental gas through a low-temperature environment; retaining the impurity separated in droplet and crystal forms in the condensation purification and separation mechanism; conducting, by the condensation purification and separation mechanism, gas-liquid separation on the experimental gas after the condensation purification; and conducting a secondary purification on the experimental gas to generate stable-pressure and clean experimental gas;
S3: mercury separation: conducting, by the pressure buffer mechanism, a pressure regulation on the stable-pressure and clean experimental gas generated through the secondary purification in step S2; delivering the stable-pressure and clean experimental gas to the mercury collection and separation mechanisms, and detecting a total input amount of the experimental gas entering the mercury collection and separation mechanisms; allowing, when the stable-pressure and clean experimental gas passes through the mercury collection and separation mechanism, the gold foil meshes in the mercury collection and separation mechanism to react with mercury in the stable-pressure and clean experimental gas so as to generate amalgam, thereby separating the mercury from the natural gas; delivering, after the mercury separation, the natural gas to the natural gas storage tank; and comparing a storage capacity of the natural gas in the natural gas storage tank with the total input amount of the experimental gas delivered to the mercury collection and separation mechanism to acquire a separated mercury content; and
S4: mercury analysis: collecting, after the experimental gas is collected by the natural gas storage tank, the amalgam generated by the reaction in the mercury collection and separation mechanism; transferring the collected amalgam to a mercury analysis device for analysis, and then determining an isotopic content of the amalgam; and comparing a determined value with the mercury content acquired in step S3, and making a correction to acquire an accurate natural gas content and an accurate mercury content in a mixed gas collected from the oil or gas well.