METHOD OF FIRING OF THE HEATING AND THERMAL FURNACES FOR THE LOW-OXIDIZING AND NON-OXIDIZING METAL HEATING Russian patent published in 2007 - IPC F27D17/00 F23C99/00 F23C5/00 

FIELD: metallurgy industry; other industries; methods of firing of the heating and thermal furnaces for the low-oxidizing and non-oxidizing metal heating.

SUBSTANCE: the invention is pertaining to the field of metallurgy industry for the low-oxidizing and non-oxidizing metal heating in the firing and thermal furnaces. The method of firing of the heating and thermal furnaces for the low-oxidizing and non-oxidizing metal heating includes usage of two periodically operating burners equipped with the individual regenerative heat-exchange nozzles. At that in each of the burners alternately exercise the process of combustion of the gas or withdrawal of the combustion products from other burner with their subsequent refrigeration in the heat-exchange nozzle, the air feeding for the gas combustion and withdrawal of the combustion products is exercised by the appropriate pipe ducts through heat-exchange nozzles and the gas passing channels connecting the working space of the furnace with the heat-exchange nozzles. At that the change of the mode of combustion of the gas for the mode of withdrawal of the combustion products and vice versa execute by switching of the streams of the air and the combustion products by means of two fly gates mounted on the pipe ducts. In the burners execute the process of the incomplete combustion of the gas with the heated primary air or withdrawal of the products of the incomplete combustion of the gas from other burner with their subsequent afterburning in the stream of the cold secondary air. The afterburning is exercised before their refrigerating in a heat-exchange nozzle. The air supply for the gas combustion execute by two streams. Directly into the burners feed the primary air constituent the part of the stream necessary for the complete combustion of the gas, and the rest part - the secondary air is fed into the over-nozzle space of the burner working in the mode of heating of the heat-exchange nozzle. The secondary air is fed into the gas-passing channel being in the mode of the heating of the heat-exchange nozzle - into the above-nozzle space in the place located before the inlet of the combustion products into the heat-exchange nozzle. Feeding of secondary air into the gas-passing channel is executed compulsorily by means of the separate bang-bang gate installed with the capability of the synchronous operation with the bang-bang gates for change of the operation mode of the work of the burners. The secondary air is fed by the way of the natural suction of the atmospheric air into the gas-passing channel through the unidirectional fluid valve installed on the air duct of the secondary air feeding at the expense of rarefaction which is created by the f smoke sucker in the gas-passing channel being in the mode of withdrawal of the combustion products. The invention allows to reduce the losses of the metal caused by the scaling in the process of heating of the furnace at the expense of the low oxidizing ability of the products of the incomplete combustion of the fuel at the complete utilization of the heat of the exhaust combustion products.

EFFECT: the invention ensures reduction of the losses of the metal caused by the scaling in the process of heating of the furnace at the expense of the low oxidizing ability of the products of the incomplete combustion of the fuel at the complete utilization of the heat of the exhaust combustion products.

5 cl, 5 dwg