关键词: 天然气水合物，热传导，相平衡温度，分解前缘，最大影响区长度

Abstract: The thermal dissociation scope of gas hydrate in deposit around heat conductor is very important for either gas hydrate exploitation or related hazard prevention. Maximum dissociation scope based on planar heat dissociation under the boundary condition of constant temperature is obtained and compared with that obtained in heat dissociation experiments of THF hydrate in deposit in this paper. It is shown that the maximum dissociation scope is determined by the difference between the temperatures of heat source and surrounding environment. The theoretical results of the maximum dissociation scope are in agreement with those of experiments, with errors less than 5%.

Key words: gas hydrate, heat conduction, temperature of phase equilibrium, the front of dissociation, the final influence length