Heat treatment furnace energy requirements

For an energy-efficient furnace basic requirements are: a larger bottom (or furnace) effective use of space (or hearth rate), in this area (or furnace) has a uniform temperature field, a higher loading capacity ; furnace heating element (or device), the furnace gas, the furnace of the workpiece has a good heat transfer, the heating time can be shortened work; good thermal insulation and less heat loss, a higher thermal efficiency. These requirements depend on the rational design of the furnace, lining, heating element (or device) or the like.
Lining.
Furnace lining to ensure structural strength and heat resistance of the premise, it should enhance thermal insulation capacity and feed savings. Simply increasing the thickness of the lining to reduce the temperature of the furnace wall is not appropriate, because it will not only increase the cost of heat and lining savings, but also a corresponding reduction in the bottom area (or chamber) for effective utilization. Achieve lining fibrosis and lightweight, has a great energy saving effect.
Refractory fiber lining can be used with prefabricated blocks laid up or installation, can also be refractory fiber spraying. An annealing furnace refractory fiber coating on the lining, and achieved good energy saving effect, light brick lining energy than a 40% reduction.
Heating element heating element arranged arrangement has some influence on the energy, which evenly arranged in the furnace temperature uniformity can be formed effective treatment space. Heating elements installed in the door, you can improve the phenomenon of low temperature blast furnace area, and sometimes not to set the furnace mouth channel, expanding the use of blast furnace zone area. Using radiant tube heating elements conducive temperature uniformity and energy.
Furnace structure and enhance the heat exchange chamber to form a heat exchange system, the heating elements, the lining, the heat exchange between the three parts. Improve furnace exchange often the following measures:
Reasonable furnace space on the TLC (single piece) fabric stove, furnace should be flat at the top of the furnace, furnace heating elements are arranged below the floor, reaching up and down both sides of the uniform heating.
Pit furnace without increasing the space under the premise of increasing the area of ??the furnace wall, to increase the heat exchange area, such as the use of corrugated roof.
Using a circular furnace, box furnace replacement, can enhance the uniformity of furnace heat transfer effect on the workpiece, and reduce the amount of heat the furnace wall.
Inner lining of high emissivity coating paint.
Install the furnace fan to enhance the convective heat furnace gas. Especially chemical heat treatment furnace, high-speed airflow can damage the surface of the workpiece hinder stagnation heat transfer and interfacial reaction furnace gas boundary bottom, played shorten the heating time and speed the process of chemical heat treatment effect.
Seal chamber, including the lead member of the furnace, the furnace shell, etc. of the sealing door. Sealing effect controlled atmosphere furnace, the workpiece quality and energy consumption. When the furnace has 96Pa negative pressure through the holes will be sucked into 3cm2 10m3 / h of cold air, the door opened 0.2m2, energy consumption will increase by 15%.
Deep furnace should also pay attention to the furnace shell sealed, deep like a furnace chimney when the furnace bottom Mifengbuyan, it will cause cracks in the lower part of the cold air from the suction chamber, the hot air from the upper overflow, causing the furnace area under the temperature is low, slow warming phenomenon.
In the erection of strong radiation resistance furnace components, this structure improves the radiation area of the inner wall of the furnace, but also improves the radiation rate.