Drying and preheating of moist coal and quenching of the formed coke

A coking installation comprising:

• means for continuously circulating a drying gas in a closed flow circuit past a heating station, a preheating station, a drying station, and a condensing station;
• means at said heating station for dry quenching freshly formed coke and imparting heat therefrom to said drying gas;
• means at said drying station for directly contacting moist coal with said drying gas to at least partially dry said coal and drive water therefrom as water vapor into said drying gas;
• means at said preheating station for directly contacting the dried coal with said drying gas to heat same;
• and condensing means at said condensing station for continuously removing from said drying gas at least some of said water vapor by condensing such water vapor.

A coking installation comprising:

• means for continuously circulating a drying gas in a first closed flow circuit past a heating station, a preheating station, a drying station, and a condensing station;
• means at said heating station for dry quenching freshly formed coke and imparting heat therefrom to said drying gas, said means at said heating station including means for circulating a quenching gas in a second closed flow circuit distinct from said first closed flow circuit directly over said freshly formed coke and a heat exchanger through which both of said gases pass for heat exchange therebetween;
• means at said drying station for directly contacting moist coal with said drying gas to at least partially dry said coal and drive water therefrom as water vapor into said drying gas;
• means at said preheating station for directly contacting the dried coal with said drying gas to heat same;
• means at said condensing station for removing from said drying gas at least some of said water vapor, means for transporting the dried coal from said drying station to said preheating station;
• a regulating conduit connected in parallel with said circuit across said preheating station and having a downstream end opening into said circuit just upstream of said drying station;
• and means for controlling the quantity of drying gas which bypasses said preheating station through said regulating conduit, whereby the drying action at said drying station is increased to ensure that the dried coal conveyed to said preheating station will always have substantially the same moisture content regardless of the moisture content of the coal prior to drying in said drying station.

A coking installation comprising:

• means for continuously circulating a drying gas in a closed flow circuit past a heating station, a preheating station, a drying station, and a condensing station;
• means at said heating station for dry quenching freshly formed coke and imparting heat therefrom to said drying gas, said means at said heating station including means for passing said drying gas as a quenching gas directly over said freshly formed coke, whereby said drying gas also serves to quench said coke and automatically picks up the heat from said coke as it passes thereover;
• means at said drying station for directly contacting moist coal with said drying gas to at least partially dry said coal and drive water therefrom as water vapor into said drying gas;
• means at said preheating station for directly contacting the dried coal with said drying gas to heat same;
• means at said condensing station for removing from said drying gas at least some of said water vapor;
• means for transporting the dried coal from said drying station to said preheating station;
• a regulating conduit connected in parallel with said circuit across said preheating station and having a downstream end opening into said circuit just upstream of said drying station;
• and means for controlling the quantity of drying gas which bypasses said preheating station through said regulating conduit, whereby the drying action at said drying station is increased to ensure that the dried coal conveyed to said preheating station will always have substantially the same moisture content regardless of the moisture content of the coal prior to drying in said drying station.