1前言改革开放近20年来.我国城市燃气的气化率大幅度提高。到1996年,全国城市燃气供应总量已发展到471.75亿m~3:城市用气人口由1978年的1108.4万人发展到1996年的1.38亿人;城市用气人口普及率由1978年的13.9%提高到1996年的73.2%.部分城市达到85%以上。城市燃气迅速发 1 Introduction Reform and opening up nearly 20 years. China’s urban gas gasification rate increased significantly. By 1996, the total urban gas supply in the country had grown to 47.175 billion m ~ 3: the urban gas-consuming population grew from 11.084 million in 1978 to 138 million in 1996; the urban population-using rate rose from 13.9 in 1978 % To 73.2% in 1996. Some cities reached more than 85%. Rapid urban gas