Chimney tray for a column for thermal treatment of fluid mixtures

A chimney tray for a column for thermal treatment of fluid mixtures, comprising:

• a collecting tray;
• and
• at least two chimneys spaced apart horizontally in the collecting tray, each chimney comprising:
• a vertically aligned chimney body which forms a passage orifice through the collecting tray;
• and
• a cover unit arranged spaced apart from the chimney body and covering the passage orifice in the vertical direction,
• wherein at least one chimney further comprises a screen which extends around the chimney body of the at least one chimney and which has a lower annular edge and an upper annular edge, and
• the chimney tray satisfies either condition (1) or condition (2):
• (1) the lower annular edge of the screen is positioned below an upper edge of the chimney body of the at least one chimney, and
• the upper annular edge of the screen is positioned above a lower edge of the cover unit of the at least one chimney, wherein the screen is spaced apart horizontally from the cover unit, wherein the ratio (V4/V1) of the height (V4) of the chimney body to the vertical distance (V1) of the upper edge of the chimney body from the lower edge of the screen is within a range from 15 to 40;
• (2) the upper annular edge of the screen adjoins the lower edge of the cover unit of the at least one chimney, wherein the screen extends vertically downward from the lower edge of the cover unit of the at least one chimney to a position below the upper edge of the chimney body of the at least one chimney, wherein the ratio (V4/V1) of the height (V4) of the chimney body to the vertical distance (V1) of the upper edge of the chimney body from the lower edge of the screen is within a range from 10 to 30.