Numerical Simulation Of Multiphase Separation Of Natural Gas Hydrate Seabed Based On Hydrocyclone

At present,as traditional fossil fuels(coal,oil and gas)continue to be mined and used,people also are constantly looking for new energy sources that can replace traditional fossil fuels in the future.Natural gas hydrate as a new type of clean energy,in the polar permafrost,marine sediments and sea and land border are rich,and under the same conditions,the same volume of natural gas hydrate carbon content is much higher than other fossils.Energy carbon content,so natural gas hydrates as a future alternative fossil energy of new clean energy by the world's attention.However,due to the unique conditions of natural gas hydrate and its own physical properties,making the development of natural gas hydrate has become very difficult,so the natural gas hydrate mining and mining process research is particularly important.In this paper,based on the idea of solid-state fluid hydrate solid-state fluidization in deep-water,summarizing the way of the current development of natural gas hydrate in the world,and compares the advantages of solid-state fluid hydro process the based on this mining method,the underwater pre-separation module in the process is mainly studied because the seabed pre-separation technology can not only reduce the energy consumption of the lifting kinetic energy of the gas hydrate pipeline,but also can effectively save the offshore working platform Of the space,which can reduce the cost of production operations.This paper analyzes and summarizes the existing mature underwater separation system and separation process at home and abroad,and finds that the literature on the underwater separation technology of non-diagenetic gas hydrate in solid state fluidization is less and can be neglected.Therefore,of the underwater separation process is basically no mature theory or experience can learn from,so the study of this problem has a very significant practical significance.Based on the related properties of natural gas hydrate and solid-state fluidization technology,a new separation process is proposed for the efficient separation of hydrate during the solid-state fluidization of natural gas hydrate.Based on the seabed separation process proposed in this paper,based on the hydrocyclone was studied under the premise of simplifying the solid-solid-liquid separation of the natural gas hydrate slurry model,the hydrate solid,sand mud and the seawater solid-solid-liquid separation submarine gas hydrate mixture slurry sand removal.By using the flow field simulation software Fluent in the hydrocyclone structure to determine the situation,the hydrocyclone of the cone angle,mixed slurry feed rate and mixed slurry particle size of the hydrocyclone separation efficiency the impact of the corresponding analysis were carried out.Finally,a small amount of methane gas in the gas hydrate mixed slurry is also taken into account for a more realistic reaction.The mixed slurry model is changed from solid-solid-liquid to solid-solid-gas-liquid separation,due to the existence of more than one phase of gas,so the traditional hydrocyclone structure can no longer meet the separation requirements,so on this basis,a new hydrocyclone-double cone-inner cone hydrocyclone device was designed.By using the flow field simulation software Fluent in the hydrocyclone structure to determine the situation,different solid particles under different cone angle combination,inlet pressure,different inlet speed,different inlet sediment volume fraction,different import gas volume fraction and the different import and export pressure on the import and export pressure under the same premise on the separation efficiency of the law were analyzed for the back of the design of a more appropriate and more effective separation equipment to provide some reference.