| 摘要 |
Disclosed are an isothermal and low temperature shift converter and a shift conversion process. The shift conversion process is optimized to design a reaction operating line by way of a T-X graph: i.e. first a CO isothermal conversion of 90% to 93% in the range of 260ºC to 310ºC, and then a isothermal conversion of 97% to 99% in the range of 190ºC to 220ºC. The shift converter comprises two isothermal reaction rings with different temperatures, corresponding to two water vapour cycle systems; the water pipe in the inner ring is a suspended "U"-shaped tube welded to the tube plate or a new-type double pipe; the outer ring is a suspended "U"-shaped tube welded to the ring tube. The catalyst beds in the inner and outer rings are continuous radial beds; the inner ring is a main reaction bed and the outer ring is a terminal reaction bed. In the operation of the present invention, the bed temperatures of the catalyst bed at the beginning and at the end are controlled only by controlling the drum pressure, which is simple and easy; a low temperature is advantageous for the chemical balance, and requires less catalyst than a high temperature with a high conversion. |
