Texaco和Shell煤气化工艺用于生产甲醇的经济性比较

新一代煤气流床气化工艺主要以Texaco水煤浆气化工艺和Shell干煤粉气化工艺为代表。Shell煤气化工艺操作温度可达1700℃，对煤种适应性高，碳转化率达99％以上。Texaco煤气化工艺的碳转化率为96％～98％。生产每吨甲醇，Shell气化工艺的煤耗量为1．25～1．28t,Texaco气化工艺为1．31～1．40t；Shell气化工艺的氧耗量比Texaco工艺低15％～25％；Shell工艺的总能耗（包括原料煤在内1为51．981GJ，比Texaco工艺低11．21GJ。然而，Shell煤气化工艺的投资高，以60×10^4t／a甲醇装置为例，Shell工艺的总投资为109242万元，Texaco工艺为85444万元：采用Shell工艺生产的甲醇总成本为1373元／t，比Texaco工艺的1277元／t高出约7．5％。同时，Shell工艺装置工业运行稳定性还需要进一步经工业化验证，而Texaco气化工艺在国内已有十几年的生产使用经验，其操作稳定性很高。通过总体经济性比较，在用于甲醇生产时，Shell煤气化工艺相对于Texaco煤气化工艺是没有优势的。

Comparison between Economics of Texaco and Shell Gasification Technologies in Producing Methanol

Texaco＇s coal slurry gasification technology and Shell＇s dry powdered coal gasification technology are the main representatives of the next-generation coal gas fluid-bed gasification techniques.The operating temperature of Shell coal gasification technology is up to 1700℃ ,making the technology highly adaptable to a variety of coal types.Its carbon conversion rate exceeds 99%.The carbon conversion rate of Texaco＇s coal gasification technology ranges between 96% and 98%.Producing It of methanol,the Shell technology requires 1.25-1.28t of coal,while the Texaco technology requires 1.31-1.4t of coal.The volume of oxygen needed by the Shell gasification technology is 15%-25% lower than that needed by the Texaco technology.The total en- ergy consumption of the Shell technology（including feedstock coal） is 51.981GJ,11.21GJ less than that of the Texaco technology.However,the Shell coal gasification technology requires higher capital expense.A 60×10^4t/a methanol unit using the Shell technology requires 1.09242 billion Yuan in investment,while a unit of the same size using the Texaco technology will require only 854.44 million Yuan in investment.The overall cost of producing methanol using the Shell technology is 1,373 Yuan per ton ,about 7.5% higher than the 1,277 Yuan per ton cost of producing methanol using the Texaco technology.In addition,the stability of the Shell technology is yet to be validated in industrial units,while the Texaco technology has been used in commercial units in China for more than 10 years and its operating stability proves very high.Comparison between the economics of the two technologies show that Shell＇s coal gasification technology has no advantage over Texaco＇s coal gasification technology in producing methanol.