Hot air furnace pipe for cupola furnace

Abstract

The invention discloses a hot air furnace pipe for a cupola furnace, which is divided into an upper section furnace pipe and a lower section furnace pipe. Both the upper section furnace pipe and the lower section furnace pipe are formed by an outer barrel and an inner barrel; the end face joints of the upper section furnace pipe and the lower section furnace pipe are connected into one whole body by flange plates; the upper part of the outer barrel of the upper section furnace pipe is provided with an air inlet; the lower part of the outer barrel of the lower section furnace pipe is provided with an air outlet; and radiating fins are arranged on the outer walls of the inner barrels. The hot air furnace pipe is characterized in that the inner barrels are integral cast steels with the flange plates; the inner barrels are coated by the outer barrels to form ring-shaped cavities; ring-shaped separators are transversely arranged in the ring-shaped cavities; the positions at the joints of the ring-shaped separators and the flange plates of the upper section furnace pipe and the lower section furnace pipe, which correspond to the cavities, are provided with through holes; and flow guide separators are longitudinally arranged at one sides of the through holes below the ring-shaped separators. According to the invention, the inner barrels are the integral cast steels, so that the hot air furnace pipe has long service life; and due to the arrangement of a ring-shaped air duct, the flow path of the air is prolonged, the heat exchange time between the air and the wall surfaces of the inner barrels and the radiating fins is long, the air temperature can be risen to 240 DEG C and the service life and the heat exchange efficiency is obviously improved.

Description

technical field [0001] The invention belongs to the improvement of a hot blast stove in the field of metal smelting equipment, and in particular relates to a cupola hot blast stove. Background technique [0002] The cupola is the most commonly used equipment for cast iron smelting. The key indicators that indicate the working status of the equipment are the combustion temperature in the furnace, the temperature of the molten iron flowing out and the service life. Of course, these indicators are affected by many factors. The quality of smelting directly affects the quality of castings. Among them, the use of furnace preheating and air supply is one of the effective measures to strengthen cupola smelting. Small and medium-sized cupolas generally use dense-reinforced hot blast furnaces composed of an outer cylinder and an inner cylinder, which is a means of saving energy and improving thermal efficiency. The hot air enters and raises the air temperature to about 180°C, thereby...

AI Technical Summary

Problems solved by technology

The use of the inner cylinder is affected by the high-temperature environment, and weld cracking, bulges, and melt-through incidents often occur, and the short service life is a prominent contradiction

In addition, the original cupola has no ring-shaped baffles for diversion from the air inlet to the air outlet, so the cold air entering the furnace is quickly discharged from the air outlet, and the heat transfer path is short, which is not conducive to the full use of heat in the furnace

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