US 4,308,102 A · Process and apparatus for drying and preheating coking coal by means of flue gas

Abstract

Flue gas discharged from a recuperator or regenerator of a coke oven battery has the steam thereof removed by means of a direct or indirect cooling and condensation operation. After the steam is removed from the flue gas it is then passed through a coke dry cooling plant in direct contact with hot coke therein to form dry cooled coke while simultaneously increasing the temperature of the flue gas. The flue gas is then passed through a coal preheating plant to directly contact and dry and preheat moist coking coal contained therein. The entire system is open, such that a given quantity of the flue gas passes only once through the system. When the temperature of the flue gas as received from a coke oven battery is extremely high, then the flue gas may be subjected to a partial cooling operation prior to the cooling and condensation operation. Further, a portion of the heat of the flue gas, after the discharge thereof from the coke dry cooling plant and prior to the introduction thereof into the coal preheating plant, may be used to generate steam and/or electricity.

Claims18

Dependent claims

A process for cooling hot coke after its discharge from a coke oven battery and for drying and preheating moist coking coal prior to its introduction into said coke oven battery to be formed therein into coke, said process comprising:

withdrawing flue gas from said coke oven battery and removing steam from said withdrawn flue gas;
then passing said flue gas through a coke dry cooling plant containing said hot coke and therein directly contacting said flue gas with said hot coke and dry cooling said hot coke to form dry cooled coke while simultaneously increasing the temperature of said flue gas;
then passing said flue gas through a coal preheating plant containing said moist coking coal and therein directly contacting said flue gas with said moist coking coal and drying and preheating said moist coking coal by transfer of heat thereto from said flue gas;
and
discharging said flue gas to the atmosphere directly after the passage of said flue gas through said coal preheating plant, and thereby maintaining said flue gas in an open system by passing given said flue gas only once through said coke dry cooling plant and said coal preheating plant and not continuously circulating such given flue gas therethrough.

2 more elements

In a system including a coke oven battery for receiving therein coal for the formation of coke, the improvement of an apparatus for dry cooling hot coke after its discharge from said coke oven battery and for drying and preheating moist coking coal prior to its introduction into said coke oven battery to be formed therein into coke, said apparatus comprising:

a coke dry cooling plant positioned to receive therein hot coke from said coke oven battery;
a coal drying and preheating plant adapted to receive therein moist coking coal prior to the introduction thereof into said coke oven battery;
means for passing flue gas from said coke oven battery through said coke dry cooling plant and therein directly contacting said flue gas with said hot coke and dry cooling said hot coke to form dry cooled coke while simultaneously increasing the temperature of said flue gas, and for then passing said flue gas through said coal drying and preheating plant and therein directly contacting said flue gas with said moist coking coal and drying and preheating said moist coking coal by transfer of heat thereto from said flue gas;
means for removing steam from said flue gas prior to the introduction of said flue gas into said coke dry cooling plant;
and
means for discharging said flue gas to the atmosphere, directly after the passage of said flue gas through said coal drying and preheating plant, whereby the complete passage of said flue gas through said steam removing means, said coke dry cooling plant and said coal drying and preheating plant is an open system such that said flue gas is not continuously recirculated therethrough.

3 more elements

Dependencies are inferred from the claim text.

Process and apparatus for drying and preheating coking coal by means of flue gas

Life of this patent

Process and apparatus for drying and preheating coking coal by means of flue gas

Life of this patent

Abstract

Claims18