| The natural gas is at present on international high qualityrecognizes, clean, safe, the inexpensive energy, has the anti-knockvalue high, discharges the pollutant to be few, merit and so oneconomic security. Is thorough and the storage and transporttechnology enhancement along with our country transport the naturalgas from the west to the east project, took the petroleum productlow-price quality merchandise the substitute, the natural gasgradually becomes the motor car engine ideal fuel.This article first introduced our country develops the natural gasautomobile feasibility, the necessity and the domestic and foreigndevelopment condition, then detailed narration natural gasdesulphurization to natural gas automobile necessity and preliminarydesign. In the article with emphasis has studied take FLUENT as thesoftware platform natural gas desulphurization catalysis modellingplan, in order to enable to include the hydrogen sulfide the naturalgas as far as possible evenly through the entire catalyst carrier,enhances the natural gas desulphurization catalysis transformationefficiency and the service life, has carried on the value simulationand the simulation to it optimizes, and carries on the contrast withthe former related conclusion.(1)Regarding the conventional structure natural gas desulphurizationcatalysis, the long tube flow field uniformity obviously surpasses thestub pipe.(2) Long gradually expands the tube regarding the conventional structure right circular cone, looked from the mobile angle, when design catalytic converter, in principle should use the small cone angle divergent tube. The Fluent simulation discovery between 0～40, 10 divergent tube velocity distributions is nearly consistent with 40 divergent tubes. Because alpha smaller, the expansion ratio length is bigger, the structure is not more compact. Therefore, considered the catalyst structure is compact, this catalyst takes 40 expansion ratios to be most appropriate.(3)Pair of oblique line divergent tube catalyst flow field simulation simulation, discovers under the same divergent tube length, because the slanting divergent tube population airflow direction occurs changes, enable the carrier border region the flowing to obtain the enhancement, the entire catalyst speed of flow distribution uniformity can enhance.Also obtains the slanting expansion tubular construction the mobile uniform function is by expands the angle the tendency function which increases first after the independent variable reduces, its maximum value nearby 60o.(4) Pair of EDH structure catalyst flow field carries on the value simulation simulation, discovered the EDH enlargement mode expansion tubular construction may improve the catalyst obviously the speed of flow distribution, and can reduce the flow resistance, is one kind of effective expansion tubular construction form.Our analogue result and the literature research conclusion is consistent, explained carries on the simulation with Fluent to the establishment catalyst flowing mathematical model is practical and feasible.(5) Pair of carrier structure surpasses the single load body structure, when the catalyst uses the double carrier, between two carrier spacings are bigger, create the first carrier speed of flow distribution to be more non-uniform, but the second carrier distributed uniformity is improved actually, between two carriers the slit is very big to the flowing uniformity influence, is not big to the pressure loss influence, when designs the double carrier catalyst should consider fully two carrier speed of flow distribution even nonuniformity, avoids between the carrier the oversized slit.The analogue result has provided the basis for the catalyst structure optimization.
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