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Shui Biyuan(China Oil and Gas Pipeline Research Institute).NATUR.GAS IND.v.20,no.2,pp.93~97,3/25/2000.(ISSN 1000 0976;In Chinese)  
Natural as hydrate (NGH) is an ice cage like crystalline compound formed from natural gas and water under certain temperature and pressure conditions.One cubic metre of NGH can carry 150~170 m 3 of gas under standard state.Through research,it is shown that NGH can be prepared at 2~6 MPa and 0~20℃ and storaged at -15℃ and normal pressure,and it can be decomposed by heating or by reducing pressure.The reaction rate of NGH can be raised and the physical conditions for applying NGH can be reduced by using some physical and chemical methods.In this paper two applied technological processes of NGH storage and transport technique are given out,which can be respectively applied to the distant transmission of natural gas and gas storage and peak shaving,having a relatively great reference value in practice.Through a comparison and evaluation of NGH with LNG,it is shown that the difficulty of NGH technique is relatively small,its investment can be economized by 1/3~1/4 and it has an incomparable safety.From the point of view of foreign development trend,NGH technique is trending towards practical application in industry.In the future,China should strengthen the study of the applied technique for NGH and develop self applied technology of NGH on the basis of the thermodynamic study.The NGH technique may replace LNG technique and become one of the large scale storage and transport methods for natural gas,having great potentialities of application and development.
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