A device and method for collecting mercury in natural gas

Abstract

The invention discloses a device for collecting mercury in natural gas, comprising: a sand control device; a quantitative test device, used to receive the natural gas from the sand control device; a gas purification device, used to receive the mercury from the quantitative test The natural gas in the device and remove the impurity gas therein; the mercury collection device, which includes: an outer cover, the air inlet of which is connected to the gas outlet of the gas purification device, and the gas outlet communicates with the outside; an inner tube located inside the outer cover, which The outer wall is covered with a gold screen for collecting mercury, and an electric heating wire is provided inside, and the electric heating wire can be connected to an external power supply to heat the gold screen to desorb the mercury collected on the gold screen. The device of the invention is simple in structure, easy to carry, suitable for field work, can collect required mercury samples in a short time, conveniently desorb the collected mercury samples, and realize accurate quantitative analysis of the collected mercury content in a short time.

Description

technical field [0001] The invention relates to a device and method for collecting mercury in natural gas, which is suitable for sample collection and pretreatment of measuring mercury content and mercury isotope in natural gas, and belongs to the field of petroleum and natural gas. Background technique [0002] Mercury is a metal element that exists in a liquid state at normal temperature and pressure, and can be evaporated into mercury vapor at normal temperature and pressure. Mercury vapor and its compounds are highly chronic and long-term toxic and are therefore an element that requires careful handling. [0003] It is generally believed that the mercury in natural gas mainly comes from source rocks. During the thermal evolution of source rocks into hydrocarbons, mercury in the form of volatile components accumulates in natural gas reservoirs together with natural gas. Terrigenous organic matter (such as coal rock and carbonaceous mudstone) is relatively rich in mercury...

AI Technical Summary

Problems solved by technology

[0009] (4) Utilize metal elements and their compounds to immobilize mercury. Such commonly used metals include Cu, Ag, and Au; patents US4909926 and US4094777 provide a method using CuS, CuO or Ag distributed on alumina proppant 2 S technology for enriching mercury; patent DEA2102039 discloses a technology for removing mercury by using copper dispersed on a porous alumina proppant; patent US4230486 and patent US4221207 both disclose a method for utilizing copper dispersed on a porous alumina proppant, such as alumina, The method for removing mercury by metallic silver on activated carbon; the method of patent DEA4116890 is to utilize a variety of metal mixtures, such as Cu, Ag, Fe, and even mixtures of Bi, Au, Sn, Zn, etc. to remove mercury together, but these mixtures should be distributed in The specific surface area is not less than 300m 2 On the proppant of / g, these proppants can be activated carbon or alumina; "Nature Geoscience" magazine (2010) PP.1-5, Laura S.Sherman etc. have disclosed a kind of utilizing gold trap to enrich mercury, and through the procedure The method of heating to desorb mercury (DOI: 10.1038 / NGEO758), this method is suitable for sampling mercury in the atmosphere, the sampling period is 2-4 days, but the composition and heating method of the gold trap are not described in detail

[0012] The main purpose of the above-mentioned technologies is to enrich the mercury element in liquid fluid or gaseous fluid. Some methods require a long sample collection time, some methods require the adsorbent to have a very large specific surface area, and some methods do not specify how to heat The adsorbent is described in detail, but only the temperature programming process of heating is described

Images