Accelerant for generating gas hydrate

Abstract

The invention relates to a natural gas hydrate, and particularly to an accelerant for strengthening the generation of a gas hydrate. The accelerant for generating the gas hydrate, provided by the invention, is prepared by compounding of a novel anion gemini surfactant and solid activated carbon particles with a strong heat transmission effect at a certain mass ratio; a liquid mixture is formed after the high-speed mechanical agitation and the ultrasonic dispersion are conducted on the reagent, and the essence is that solid particles with a high heat-conducting property are wrapped in the gemini surfactant, so that nanometer solid particles cannot be agglomerated easily, and the mixing solution with uniformly dispersed solutes is formed, and the mixing solution is free of sediment; the application temperature ranges from 0 DEG C to 10 DEG C, the pressure ranges from 0 MPa to 12 MPa, and the time of hydrate generation induction period ranges from 1 min to 3 min; compared with the pure water system, the generation speed rate of the hydrate is increased by 140%-200%.

Description

technical field [0001] The invention relates to natural gas hydrate, in particular to an accelerator capable of strengthening the formation of gas hydrate. Background technique [0002] Gas hydrate refers to the formation of a non-stoichiometric clathrate solid compound through a quasi-chemical reaction between gas molecules and water molecules under certain high pressure and low temperature conditions; the formation process of hydrate is a process accompanied by material transfer and energy change , the strengthening of hydrate formation can be carried out from two aspects: traditional mechanical strengthening methods such as stirring, spraying, and bubbling; The addition of accelerators, including thermodynamic accelerators and kinetic accelerators, is mainly to enhance the heat and mass transfer at the gas-liquid interface; as a working fluid with high thermal conductivity and heat transfer, nanofluid has High surface activity and large specific surface area have been pr...

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Problems solved by technology

Among the traditional strengthening methods, mechanical strengthening is mainly achieved by means of stirring and other means to increase the contact area of ​​gas and liquid and accelerate the removal of local reaction heat. However, this promotion method consumes a lot of energy and requires the assistance of external power equipment. , only suitable for small-scale hydrate production; literature "Du Yan, He Shihui, Huang Chong, et al. Experiments on gas hydrate formation in jet reactors [J]. Natural Gas Industry, 2008, 28(8); 126-128. "proposed a jet cycle type hydrate rapid generation device, literature "Bai Jing, Liang Deqing, Li Dongliang, et al. Research progress of natural gas hydrate reactor [J]. Petrochemical, 2008, 37(10); 1083-1088. "pointed out the hydrate intensified generation devices in the form of stirring, bubbling, fluidized bed, etc.; chemical intensification is considered to be the best intensification method for hydrate formation at present. Traditional accelerators include ionic liquids, non-ionic surfactants, Organic silicon, composite hydrate formation accelerator, etc., among which SDS (sodium dodecyl sulfate) is a surfactant with the best promotion effect according to the current experimental results; the patent "a composite gas hydrate accelerator and Its preparation method" (publication (announcement) No. CN 103318890A) proposed a composite hydrate accelerator mixed with ionic liquid and non-ionic surfactant, and the patent "Gas hydrate formation accelerator and its preparation method and application "(Publication (Announcement) No. CN102784604 A) proposed an accelerator composed of a surfactant solution and a strong hydrophobic solid particle, and the patent "a CO 2 Hydrate formation accelerator" (publication (announcement) No. CN 101596393A) proposes a hydrate formation accelerator made of quaternary ammonium salt compounds; but generally speaking, the promotion efficiency of these accelerators for hydrate formation is still not high enough, and relatively In the industrial application process, the dosage is large, the reuse rate is low, and the economy is poor; therefore, it is urgent to develop a hydrate accelerator with low concentration, good economy, and high efficiency

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