HEATING FURNACE WITH REGENERATIVE BURNERS AND METHOD OF OPERATING THE HEATING FURNACE

摘要

A method of controlling a furnace pressure for preventing air from intruding to a heating furnace, a method of stable operation during low combustion load of heat regenerating burners and a method of measuring concentration of an atmospheric gas in a heating furnace are proposed. When the heat recovered with burners each attached with a heat regeneration body is used for heating the combustion air of burners at a combustion state, the suction ratio of the exhaust gas from the burners to the heat regeneration body is adjusted to control the furnace pressure in accordance with a combustion load on an entire heating furnace. The furnace pressure is controlled by adjusting the flow rate of dilution air in accordance with the temperature of the exhaust gas in the exhaust stack on the inlet side of a recuperator in the heating furnace and the combustion load on the heating furnace. When the extraction door of the heating furnace is opened, the flame for heating burners located in the lower region of the furnace extraction end is extended for the width of the opening in the lateral direction of the extraction port thereby shutting the intruding path of air from the extraction port with the burner flame, thereby suppressing the increase in the oxygen concentration in the furnace. In a case where the combustion load on the heat regeneration burners is small, a hot blow is supplied to a suction device for sucking the exhaust gas in the furnace from the burners through the heat regeneration body during a not-combustion state. When operation for the heating furnace is conducted while utilizing to the recovered heat for heating the combustion air of the burners during combustion state, a portion of the exhaust gas sucked from the burners is introduced into an analyzer to measure the concentration of ingredients in the exhaust gas.