SU1211571A1 - Continuous convection heating furnace with lateral circulation of heat-transfer agent - Google Patents

Description

one

12

The invention relates to metallurgical equipment, in particular, to convective heating furnaces with transverse circulation of heat transfer media, and can be used for heating billets of various geometric shapes and sizes before pressure treatment or for continuous heat treatment of products.

The aim of the invention is to increase the intensity and uniformity of heating of workpieces of various geometric shapes by means of controlled change in the direction of movement of the heat transfer medium in each circulation circuit.

The furnace contains a working chamber 1, a mechanism 2 for moving the blanks in the furnace, electric heaters 3 installed above the working chamber 1, furnace fans 4 installed by a suction in the zone of electric heaters 3 distribution box 5 with a guiding device 6, made under the working chamber 1, rotary the gates 7 with taken out of the furnace drive 8, made in the side wall of the working chamber 1.

The stove works in the following way.

The furnace fan 4 sucks the heat carrier heated by the electric heaters 3 and supplies it to the vertical channel 9. From the vertical channel 9, the coolant flows into the working chamber 1 in two ways simultaneously or separately for each one depending on the position of the rotary gate 7. At the far right position a gate 7. The entire coolant is fed immediately into the working chamber 1 from the side of its side wall and passes through the load in the horizontal direction. With the leftmost position of the rotary gate 7, the entire coolant is fed into the working chamber 1 through the lower distribution box 5 under the blanks and passes through the loading in the vertical direction evenly across the width of the furnace. In the intermediate position, the rotary gate 7 divides the coolant into two parts and directs them into the working chamber 1 at the same time in two ways.

115712

The position of the rotary vane 7 varies with the help of the actuator 8 depending on the change in the shape and size of the blanks, the nature of their loading and the required heating conditions.

For example, when heating long workpieces of unequal cross-section along the length with thickening to one: - from the ends, the rotary gate 7 is set to the extreme right position, and the blanks are loaded by thickening towards the heat carrier entering the working chamber, which leads to leveling of the heat exchange conditions

 5 and massive parts of the workpiece. The same flow pattern of the coolant can also be selected when heating the ring blanks with a height greater than their thickness.

20 When heating flat or steep lengthy workpieces of the same cross section along the length or loading, in a few rows along the width, the rotary gate 7 is set to the extreme

25, the left position and the entire coolant is fed into the working chamber 1 through the lower distribution box 5 evenly over the furnace width.

In order to ensure uniform

30 and the rapid heating of various workpieces across the width of the working chamber. The position of the rotary vane in individual zones of a multi-zone furnace can be different and is determined by experience.

2 way.

The proposed furnace allows you to quickly and evenly heat pits or products of various geometric shapes and sizes due to

40 regulates the movement pattern of the coolant in the working chamber.

According to the results of preliminary testing of the experimental section of the proposed furnace, the temperature difference of the heating of the blanks across the width of the working chamber over the entire heating cycle did not exceed 5-7 Cj and the heating rate of the blanks (products) increased about 2 times,

5Q These advantages allow you to increase the productivity of the furnace, improve the heating quality of billets or products of various geometric shapes and sizes.

BHIimiH Order 632/45 Circulation 561 Subscription Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (1)

PASSING CONVECTIVE HEATING FURNACE WITH TRANSVERSE HEATING CIRCULATION, containing a heat-insulated working chamber and circulation circuits with vertical heating channels, fans installed on one of the side walls of the furnace, and electric heaters, mounted above the working chamber, which increases the purpose of increasing and uniformity of heating of workpieces of various geometric shapes by means of an adjustable change in the direction of movement of the coolant in each circulation circuit e, the furnace is equipped with a distribution box with guide nozzles located under the working chamber and connected to the vertical discharge channels, and dampers installed in each circulation circuit at the entrance to the working chamber and configured to block the entrance to the working chamber and / or vertical discharge channel. SU „„ 1211571