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为了降低航天飞机的发射成本,美航宇局准备在肯尼迪空间中心附近建造一个综合利用设施—煤气化工厂,专门生产航天飞机飞行所需要的液氧燃料。据计算,在航天飞机的前6次飞行中,每一次飞行平均用492,000加仑或295,000磅的液氢,每磅液氢的平均价格为1.47美元,也就是说,航天飞机每次发射的燃料平均要花43万多美元。现在使用的液氢燃料是用天然气生产的。生产这种燃料的厂家在
To reduce the cost of launching a space shuttle, NASA plans to build an integrated utilization facility near the Kennedy Space Center, the coal gasification plant, to produce the liquid oxygen fuel needed for space shuttle flights. It is calculated that on the first six flights of the space shuttle, 492,000 gallons or 295,000 pounds of liquid hydrogen per flight averaged $ 1.47 per lb of liquid hydrogen, meaning that the average fuel delivered per shuttle It costs more than 430,000 U.S. dollars. The currently used liquid hydrogen fuel is produced from natural gas. The manufacturer of this fuel is at