SU751837A1 - Thermal recirculational furnace - Google Patents

Description

one

The invention relates to heating devices and can be used in heat treatment furnaces of the metallurgical and engineering industries.

The thermal recirculation furnace known is equipped with high-speed GTPN burners with a central active jet of secondary air. The burner used in such a furnace creates a quantity of gas movement sufficient to form efficient circulation around the charge, and injection mixers installed in the hearth and at an angle to the roof ensure the exhaust gases recirculate and, therefore, equalize the temperature fields in the working furnace space

k

Also known is a thermal recirculation furnace containing a lined working chamber, gas burner devices located in the side walls of the furnace, and smoke exhaust ducts. The heat circuit of the furnace provides for a change in the direction of movement of the heat transfer medium around the charge by alternately turning on the burner devices 2 arranged opposite each other.

The creation of recycling in heat-treatment furnaces of the type in question, using

The design of injection mixers and the work in a reversible pattern contribute to a fairly efficient and uniform heating of the charge. However, taking into account the use

With these methods and means, the danger of overheating of the tank, especially its parts, which are the closest to the gas-burning devices, is not excluded. In addition, injection mixers are quite complex.

10 in the manufacture and installation in the furnace, and placing them in the walls of the furnaces, as stated above, increases the hydraulic resistance in the path. The aim of the invention is to improve

15 quality heating metal.

The goal is achieved by the fact that it is equipped with refractory partitions installed in the working space along the side walls, made with a longitudinal movement mechanism, the partitions having openings coaxially with gas-burning devices.

FIG. 1 shows a furnace, a cross-section; in fig. 2 is a diagram of the drive of movable refractory partitions, in plan.

The furnace includes a lined working chamber 1, gas-burning devices 2, smoke exhaust ducts 3 located in the furnace walls, two movable refractory

30 partitions 4 on metal bases

5, the rollers 6 placed in the irodol guides 7. The refractory partitions have holes 8 coaxially with gas-burning devices and the role of injection mixers is shown. Both partitions of Predict 1, ayuts viered - iazad along Iechi, using two independent displacement mechanisms, established outside of it.

The movement mechanism includes an electric motor 9, which, through an elastic coupling 10 with an electromagnetic brake 11 of the gearbox 12, a coupling 13, gear 14, located in the rear of the gear rack, pushing the valve 15, the bolt 16 connecting the push rod 15 and the metal base, carried out em movement of the fireproof partition.

The furnace works as follows. During the heating period of the chamber 17, for example on the left, the first non-displacement mechanism (on the FNG. 2 on the left) with a metal pull through the gate transmits the pushing force to the metal axisation of the first refractory partition (on the FNG. 1 and 2 on the left). This fire wall and the roller is moved in longitudinal guides until the axes of the injection mixers coincide with the axes of the gas-burning devices installed in the left wall of the furnaces. The second movement mechanism (in Fig. 2 on the right) is activated shortly with the first. However, they move the second refractory partition (in Figs. 1 and 2 on the right) so that the axes of its injection mixers do not coincide with the axis of the gas-burning devices installed in the right-hand wall of the furnace. The indicated positions of both refractory partitions are workers during this heating period.

Combustion products (and secondary air — when using, for example, high-speed burners), coming from gas-burning devices installed in the left wall of the furnace, pass through the injection mixers of the first refractory partition, and inject exhaust gases from the working space of the furnace. The mixture of fresh and exhaust gases through the injection mixers falls under the cage on the left, passes under it and rushes under the roof of the bed. At the same time, the gases coming from the gas-burning devices installed in the grass of the furnace hit the deaf (second) refractory partition, are piped up and connected to the common circulation flow, organized by the left-hand group of gas-burning devices and injection mixers. Minor non-leakage of gases through the ip-jack mixers does not render the second refractory rerotor a significant amount for the day. This period of work ensures uniform heating of the tank on the left and the absence of its burnings on the right. The furnace gases that are not returned to the redirection are discharged through the smoke exhaust ducts. At the next time point, approximately 90-120 s, when the cage is heated to the right, the second non-displacement mechanism installs the second (right) refractory partition so that the axes of its injection mixers coincide with the axes of the gas burner devices installed in the right-hand wall of the furnace. At the same time, the first movement mechanism moves the first (left) refractory partition so that the axes of its injection mixers do not coincide with the axes of the gas-burning devices of the corresponding left wall of the furnace. Circus cyoia stream during this period

right-sided gas-burning gas-burning devices and corresponding mixers, just as it took place in the nerves when heating the cage to the left. This period of work ensures uniform heating of the tank on the right and the absence of its burnings on the left. At a subsequent point in time, the cycle repeats.

The proposed co-instrumentation pepp is simple and reliable in operation. Exact switching on and stopping of the movement mechanisms is provided by simple automation. In the development of specific projects, the drive of both mechanisms of movement can be decided by a common one.

Claims (2)

1.Pechi painting industry. Sat Proceedings of VNIPI "Teploproject, Vol. 39. M., 1975, p. 44. 2.Klepzig Fachbevichte, 1974, 82, No. 1, 8.