DEVICE FOR INTAKE OF HEATING RICH GAS TO HEATING SYSTEM OF COKE OVENS WITH LOWER GAS INTAKE Russian patent published in 1994 - IPC

FIELD: coke and by-product process. SUBSTANCE: heating gas, for example coke-oven gas, from intake gas conduit 1 through stopcocks 2 and reversing four-way cocks (K) 3 is supplied to one of distributing headers (PK) 4 connected to K and from it through vertical gas intake pipes 6 - to gas intake vertical conduits 8 in the coke oven brickwork. The number and layout of headers and taps from them is determined by the oven heating system. Simultaneously with the supply of coke-oven gas air is supplied to second distributing header (PK) 5 through intake gas pipes 7 to intake gas conduits 9 for degraphitizing of these conduits. In definite time intervals (20 to 30 min) directions of flow of gas, air and combustion products in the oven heating system are changed (turnover). On completion of turnover the reversing four-way cock comes to the position when gas is supplied to the distributing header, to which air was supplied before it; and air is supplied to the header, to which gas was earlier supplied, air is supplied through branch pipe 14 with a diaphragm for a constant low air supply when gate valve 13 is closed. Due to a restricted air supply, slow (during 2-3 minutes) evacuation of gas from the distributing headers and intake gas pipings occurs. Due to the laminar air flow, no active mixing of air with the remaining gas occurs and no points of air-gas mixture arise that cause a gas "popping". Opening of gate valve 13 completes the turnover process 2-3 minutes after completion of the change of direction of gas flows in the oven. Since that moment nominal amount of air for degraphitizing is supplied. Each subsequent operating cycle of the system begins in 20 to 30 min. EFFECT: prevention of "poppings" in heating system and enhanced reliability of the device in operation. 6 dwg