| 摘要 |
The application relates to a process for operating an appliance designed for generating cracked gas to produce NH3 synthesis gas from coking plant gas, natural gas, refinery gas, liquid gas, naphtha or the like as the feed gas by catalytic cracking by means of steam and air in a double-pipe reactor which is located in a reactor furnace and in whose outer pipe at one end at least the feed gas and steam is introduced and from whose inner pipe, at its end in the same position, the cracked gas is passed out, the outer pipe and inner pipe being in flow connection with one another at the end opposite to the inlet port of the outer pipe and the outlet port of the inner pipe, and both pipes containing catalysts, of which preferably the catalyst of the outer pipe has a higher activity than the catalyst of the inner pipe, and the air being introduced into the inner pipe (3) at the last-mentioned end, at which the inner pipe (3) is in flow connection (6) with the outer pipe (2), and the air preferably being introduced into the gas stream of the inner pipe (3) at different heights. <IMAGE> |
