| 摘要 |
<p>The present disclosure relates to a method and an arrangement (1) for expanding a gas stream comprising carbon dioxide, CO 2 , the method comprising: removing CO 2 from a process gas to produce a CO 2 lean gas stream comprising residual CO 2 ; 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 CO 2 from the residual CO 2 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.</p> |
