| 摘要 |
The present disclosure relates to a method and an arrangement (1) for expanding a gas stream comprising carbon dioxide, CO2, the method comprising: removing CO2 from a process gas to produce a CO2 lean gas stream comprising residual CO2; monitoring a temperature of the gas stream downstream of an expander (7,10,16); controlling a pressure of the gas stream downstream of the expander by means of a pressure controller (9,15,21); and overriding the pressure controller when the temperature downstream of the expander is below a predefined minimum temperature; whereby deposition of solid CO2 from the residual CO2 in the gas stream is avoided. The disclosure also relates to a gas cleaning system and a power plant, such as an oxy-combustion power plant, associated with the arrangement. |
