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Changxing Yongcheng Industrial Furnace Co., Ltd.

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Address: Qiaonan Industrial Zone, Lincheng Town, Changxing County, Huzhou City, Zhejiang Province

Box type heat treatment furnace

2020-08-18 09:11:28
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Detailed :

Box furnace

Application: (muffle furnace) chemical analysis of coal, coking products, chemical raw materials. It can be used in electric power, coal, papermaking, petrochemical, cement, agriculture animal husbandry, medical research, teaching other industries departments.

Structure design: the furnace is made of stainless steel plate, surrounded by heating hot air circulation chamber, hot air flows in the furnace, greatly improving the temperature uniformity. Because of the mixing of hot air, the convection heat sharing of atmosphere in the furnace are strengthened.

The furnace the furnace frame are designed separately. The furnace is placed on the load-bearing roller at the bottom of the furnace frame, the front rear can slide freely. When the furnace is heated, it can extend freely along the length direction.

In order to prevent the leakage of hot gas in the furnace, a total of 2 layers of seals are designed at the furnace door inside to outside. The inner layer adopts ceramic fiber rope sealing structure, the outer layer adopts silicone rubber sealing ring. In order to prolong its service life, stainless steel cooling water jacket is designed at the furnace mouth seal for cooling. The door lock adopts multi-point handwheel rotation locking mechanism, which can lock the door around evenly at the same time. In addition, the fixing device of furnace door is installed on the end face of furnace, the movable double hinge mechanism is adopted, which can move with the free extension of furnace, the sealing effect is good.

An exhaust chimney is designed on the top of the equipment to discharge a large amount of waste gas smoke generated in the heating process. The discharge flow can be controlled by adjusting the handle of the damper.

control system design

The control system is integrated in the furnace body. The intelligent program temperature controller is selected, the temperature curve is adjusted by setting automatic control. The linear combination is used to control the object. The temperature controller receives the signal detected by thermocouple controls the power module.

Fan position design

The fan is located at the rear of the furnace. The air is blown through the heating elements through the volute the air ducts on both sides. After the atmosphere is heated, it enters the furnace horizontally to heat the workpiece evenly, then it is sucked into the circulating fan through the suction outlet at the rear to fully circulate stir.

Design of diversion device

If the volute is removed, the fan performance will be reduced by more than 50%. The hot air box furnace adopts double circulation mode, the fan is located at the rear of the furnace body, there are two circulation air ducts on both sides, the rear volute has two-way air outlet.

In the hot air chamber, due to the limited space, the expansion section of the volute is short, the outlet area is large, the air pressure loss is large. In the design of volute, the shape of guide vane should be reasonable, the number of guide vane should be 4-8, the installation angle of guide vane should be determined according to the impeller shape flow rate. The width of volute should be designed without touching the impeller.

matters needing attention:

Due to the poor sealing of furnace mouth door, the heat dissipation of box furnace is large, its temperature is lower than that of the furnace center. If the temperature difference range of the heated workpiece is required to be controlled in a small range, the heating area of the parts will be reduced, the corresponding effective area of the furnace will also be reduced. The furnace can work at full load, resulting in the waste of energy man hour, the unit consumption of products will also follow Therefore, it is necessary to expand the average temperature zone of box furnace as much as possible. The specific methods are as follows:

1. The furnace door is equipped with electric heating elements, which can increase the temperature at the furnace door improve the temperature uniformity of the furnace. High temperature box furnace is the heating mode of resistance wire. In the process of temperature uniformity test, it is analyzed the test data that the temperature of a certain test point is low. By adjusting the heating current of resistance wire, the furnace temperature uniformity can meet the process requirements.

2. Along the length direction of the furnace, reasonable arrangement of the power (resistance wire) can increase some power at the furnace mouth, can also adopt the grouping zoning control method.

3. The fan is set to force the gas convection in the furnace, which can improve the furnace temperature uniformity.

4. To improve the paint color of the furnace shell, the radiation coefficient varies with the color of the object. According to the experimental furnace shell sprayed with silver gray black paint, the heat dissipation of the outer space of the furnace can be reduced.

5. Improve the temperature control system adopt appropriate furnace temperature regulation method. By using PXR temperature control instrument changing the control mode to PID continuous control mode, the furnace temperature uniformity can meet the requirements of production process.


Real time display:


箱式热处理炉


箱式炉1.png


箱式热处理炉

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