The simulation experiment with a surface heat exchanger was carried out on a self-setup visual equipment with constant volume

and the heating temperature was 84.8℃

72.2℃

50.5℃

30.9℃.From the experiment observation

dissociation process can be divided into two stages: gas release stage and end of dissociation stage.At the beginning of the dissociation

the pressure increased rapidly

then with the dissociation proceeding towards the end the pressure gradually leveled off.Computation showed that in the whole process of hydrate dissociation

average rate of dissociation was about 0.16—0.46 mol·min-1·m-2

and energy efficiency was between 1.33 and 3.74.At the gas release stage average dissociation rate was 0.27—2.56 mol·min-1·m-2

and energy efficiency was between 2.25 and 5.58.Compared with related literature

the energy efficiency of thermal dissociation increased obviously.In practical application

there is an optimizing thermal dissociation temperature which not only increases rate of hydrate dissociation but also improves energy efficiency and save energy.