Hot gas cooler for a coal gasification plant

A hot gas cooler for a coal gasification plant comprising

• a pressure vessel having a vertically disposed casing with an inlet spigot at an upper end for receiving an exit of a reaction vessel;
• an insert of polygonal cross-section of n-sides in said pressure vessel including a plurality of pipes for conducting cooling medium therethrough, said pipes being in secured relation to each other to define a fall chamber for conducting a hot gas therethrough, said insert having an inlet to said fall chamber at an upper end in sealed relation to said inlet spigot to receive a flow of hot gas, an outlet from said fall chamber at a lower end to discharge slag particles and a plurality of peripherally disposed openings to exhaust the hot gas flow from said fall chamber;
• a jacket of polygonal cross-section of n-sides including a plurality of pipes for conducting a cooling medium therethrough, said pipes being secured together to form a gas-tight wall, said jacket being circumferentially offset from said inset by an angle equal to 360.degree./2n and spaced about said insert to define a first annular chamber therebetween communicating with said peripheral openings of said insert and sealed from said casing, said jacket being spaced from said casing to define a second annular chamber therebetween;
• at least one gas exhaust passage connected to said jacket and communicating an upper end of said first annular chamber with the exterior of said casing for exhausting the cooled gas therethrough;
• and
• means for discharging slag from said outlet of said insert, said means including a funnel passing through said pressure vessel.