Hearth direct-combustion energy-saving hot-shear furnace

Abstract

The invention discloses a hearth direct-combustion energy-saving hot-shear furnace which comprises a hearth and a PLC (Programmable Logic controller) control system, wherein a high-speed combustor is arranged on a wall of a hearth discharge rod; the high-speed combustor is connected with the PLC control system through a circuit; a flue is arranged at the upper part of the hearth; a plate type heat exchanger for recycling a fume rest heat is mounted on one side of the flue; the flue is internally provided with a zirconium oxide content tester; a pneumatic cylinder and a flue baffle are arranged at the top of the flue. The hearth direct-combustion energy-saving hot-shear furnace can precisely organize combustion and recycle the rest heat of fume; when the combustor is changed into the high-speed combustor which is directly mounted inside the hearth, a gas inside the hearth is stirred by high-speed air flow of 150m / s generated from the high-speed combustor, the temperature inside the hearth is uniform, the number of aluminum rods is reduced by 7-9, the capacity of the hearth is reduced, the volumetric heat intensity of the heart is improved. The purposes of improving the product quality, reducing fuel consumption and reducing pollution are achieved.

Description

technical field [0001] The invention relates to a heating furnace, in particular to a furnace direct-fired energy-saving thermal shearing furnace. Background technique [0002] At present, there are generally three types of aluminum rod heating furnaces in the extrusion process of the aluminum profile industry, namely single rod furnaces, short rod furnaces and multi rod furnaces. Among them, the multi-rod furnace not only heats the aluminum rods to meet the extrusion requirements, but also has the function of homogenizing the aluminum rods. The multi-rod furnace currently used has the following disadvantages: [0003] 1. Set up a combustion chamber separately, and use the circulating fan to bring heat into the furnace to heat the aluminum rod. There are two problems in this process. One is that the combustion of the burner is intermittent. After the temperature reaches the set temperature, the burner is turned off. When the temperature is lower than the set temperature, t...

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Problems solved by technology

The second is that the combustion flame and the circulating air lose a lot of heat in the heat exchange process

[0004] 2. The exhaust gas temperature is high, reaching above 320°C, which wastes energy

[0005] 3. The temperature difference in the furnace is large, and the aluminum rod is heated in the furnace. It is generally divided into three areas. Due to the suction effect of the circulating fan, the temperature in the II area is 30°C lower than that of the I and III areas, or even as high as 70°C. Lost extrusion quality, wasted energy

[0006] 4. The control method of air-fuel ratio is too simple to precisely organize combustion, CO reaches 1200ppm, O 2 The content reaches 16%, the loss of chemical incomplete combustion is large, the amount of smoke is large, and the loss of smoke exhaust is high

[0007] 5. The hearth is too large and there are too many rods. Nowadays, multi-rod furnaces generally contain 12 rods, which store a large amount of heat and waste gas after repeated heating and cooling.

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