| 摘要 |
1,137,371. Hydrogen; ammonia. PULLMAN Inc. 11 Jan., 1967 [19 Jan., 1966], No. 1614/67. Heading C1A. [Also in Division C5] A hydrogen-rich gas at intermediate pressure made by a catalytic steam re-forming and/or a partial combustion process, or by the carbon monoxide shift conversion process, is compressed to a high pressure, e.g. 2200 p.s.i.g. at least in part by the energy provided by expanding steam which was generated at a pressure, (e.g. 1450 p.s.i.g.) greater than the intermediate pressure. Nitrogen may be present in the hydrogen-rich gas at intermediate pressure. The mixture at high pressure may then be catalytically converted to an ammonia-containing gas. Boiler feed water at 1500 p.s.i.g. enters at 161 having traversed heat exchangers 74, 78, 84, 124, its path to compressor 91 being via 14, 19, drum 162 (which receives steam at 1500 p.s.i.g. from the exchangers 31, 32, 37 in parallel) 173 and 19, to a steam turbine (229), see Fig. 2 (not shown), driving the compressor 91. Make gas leaving the secondary reformer 23 traverses the apparatus 34, 35, 53 and 82 to the first stage 92 of the compressor 91, part being recycled at 800 p.s.i.g. via 12 to the hydrocarbon feed input. and the rest entering the ammonia synthesis apparatus (illustrated in the bottom L.H. quarter of the Figure) which includes a further compression stage 93. Steam leaving the turbine (229) is divided, one part driving a second turbine (234) for the compressor, and the rest providing steam at 540 p.s.i.g. for driving sundry pumps and compressors, and for delivery at 17, 27 to the reformers. Condensate is recycled to the boiler feed water input. Hydrocarbon feeds include refinery gas, coke oven gas, natural gas, 1.p.g. naphthas, crude and residual oils, and solids. |
