摘要:
First regenerators (3A-3C) which are in combustion exhaust gas exhaust passages, second regenerators (4A-4C) which are in suction/recovery passages for sucking and recovering N2, an atmospheric gas, are provided to three or more regenerative heaters (1A-1C), respectively. In one (1C) of the regenerative heaters (1A-1C), the sucked N2 atmospheric gas is passed through the second regenerator (4C) to regenerate its sensible heat. In another one (1A), combustion air is passed through the second regenerator (4A) in which the heat is stored and combustion is carried out by using the heated air. Only the combustion exhaust gas is passed through the first regenerator (3A) for regeneration. In the other one (1B), the N2 atmospheric gas is passed through the first regenerators (3A-3C) in which heat is regenerated to convert the regenerated heat into sensible heat, which is supplied to the atmosphere of an object and heats the object. These processes, i.e. combustion, atmospheric gas heating and atmospheric gas suction, are repeated in this order. Thus, the atmospheric gas is recovered and reused, and the sensible heat of the atmospheric gas is converted into the sensible heat of the combustion air to improve the heat efficiency.
摘要:
Apparatus for supplying blast to a blast furnace (1) having a plurality of hot blast stoves (4, 5, 6), each stove including a cold blast inlet, a fuel inlet, an air supply inlet, a hot blast outlet, and a waste gas outlet; a waste heat recovery unit (30) connected to a fuel supply, the stove fuel inlet and the cold blast inlet. The stove waste gas outlets are connected to the cold blast inlets, whereby stove waste gas from one stove (5) is supplied, via the waste heat recovery unit, as cold blast to another stove (4).
摘要:
First regenerators (3A-3C) which are in combustion exhaust gas exhaust passages, second regenerators (4A-4C) which are in suction/recovery passages for sucking and recovering N2, an atmospheric gas, are provided to three or more regenerative heaters (1A-1C), respectively. In one (1C) of the regenerative heaters (1A-1C), the sucked N2 atmospheric gas is passed through the second regenerator (4C) to regenerate its sensible heat. In another one (1A), combustion air is passed through the second regenerator (4A) in which the heat is stored and combustion is carried out by using the heated air. Only the combustion exhaust gas is passed through the first regenerator (3A) for regeneration. In the other one (1B), the N2 atmospheric gas is passed through the first regenerators (3A-3C) in which heat is regenerated to convert the regenerated heat into sensible heat, which is supplied to the atmosphere of an object and heats the object. These processes, i.e. combustion, atmospheric gas heating and atmospheric gas suction, are repeated in this order. Thus, the atmospheric gas is recovered and reused, and the sensible heat of the atmospheric gas is converted into the sensible heat of the combustion air to improve the heat efficiency.
摘要:
Provided is a combined molten iron manufacturing apparatus. According to the present invention, it is possible to stably produce molten iron by using conventional metallurgical fuel and raw materials in a molten iron manufacturing apparatus based on the fluidized reduction furnace and the coal filling-type melter-gasifier and stably produce molten iron by using low-grade fuel and raw materials which are unsuitable for conventional metallurgy in a molten iron manufacturing apparatus based on the molten-bath type melting reduction furnace connected thereto, by combining the two molten iron manufacturing apparatuses through an additionally configured separate fluidized reduction furnace in the molten iron manufacturing apparatus based on the fluidized reduction furnace and the coal filling-type melter-gasifier and the molten iron manufacturing apparatus based on the molten-bath type melting reduction furnace.
摘要:
In a blast furnace plant (10), at least three regenerative heaters (14.1, 14.2, 14.3) are cyclically operated on blast and on gas: while a regenerative heater is operated on gas, hot flue gas is produced and caused to flow through the regenerative heater so as to heat the heat storage elements (46); and while a regenerative heater is operated on blast, process gas (32), i.e. a CO-rich fraction of the top gas (16), is blown through the regenerative heater so that the process gas takes up heat from the heat storage elements. During a changeover of a regenerative heater from on-blast to on-gas operation, the regenerative heater is purged from process gas using flue gas collected after having flown through at least one of the regenerative heaters.