KR830002717Y1 - Heat Treatment Furnace - Google Patents

Abstract

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Description

Heat Treatment Furnace

1 is a block diagram of a conventional heat treatment furnace.

2 is a block diagram of an embodiment of a heat treatment furnace of the present invention.

3 is a side view showing the recessed portion in cross section.

4A and 4B are longitudinal cross-sectional views in directions perpendicular to each other of the recessed portions.

5 is an explanatory diagram for showing the effect of the heat treatment furnace of the present invention.

Figure 6a is a side view of one embodiment of a heat treatment furnace of the present invention.

6B is a diagram similarly showing the temperature distribution of the heat treatment furnace of the same figure (a) as a comparison with the temperature distribution of the conventional heat treatment furnace.

The present invention is an anoxic heat treatment apparatus having a heat treatment furnace, in particular, a heating zone and a cooling zone, and an apparatus for generating a heating gas used as a furnace of the heat treatment apparatus. It relates to a heat treatment furnace provided with.

This type of heat treatment furnace is used for annealing brazing of various parts and is widely used for continuous processing.

FIG. 1 is a block diagram showing an example of a heat treatment furnace that is conventionally used, and is composed of an anoxic heat treatment apparatus 1 and a heat generating gas generator 2, which are provided independently of each other.

The oxidation-free heat treatment apparatus 1 is composed of a heating zone 11, a cooling zone 121, 122, a loading table 13 of an object to be processed, and an unloading table 14 of the object to be disposed of continuously. Iii) the workpieces are transported by a mesh belt (not shown) which moves inside them. The exothermic gas generator 2 is provided with a exothermic gas-modifying furnace 21 and a refrigerator 22, and includes a source gas pipe 23, a modified gas pipe 241, 242, Cooling water pipes 251 and 252 and waste water pipes 26 are provided. 31 is a temperature controller and 32 is a keyboard.

In this heat treatment furnace, the raw material gas mixed at a predetermined mixing ratio using a flow meter is supplied from the raw material gas pipe 23 to the exothermic gas-modifying furnace 21 to be incompletely burned and modified.

The modified gas heated to 1,000 ° C. or higher in the exothermic gas reforming furnace 21 is cooled to about 30 ° C. by the cooling water supplied from the cooling water pipe 251, and then passes through the modified gas pipe 241 to the freezer 22. After cooling to about 5 ° C to remove moisture to adjust the dew point, the oxidation point is supplied to the non-oxidizing heat treatment apparatus 1 by the denatured gas piping 242 and subjected to oxidation-free treatment of the workpiece.

However, in this heat treatment furnace, since the modified gas which has been heated to high temperature by the combustion heat is used, the heat energy of the modified gas and the cooling water for cooling the modified gas are used in vain, so that the improvement in terms of economics and energy saving is inevitable. It is requested.

The present invention aims to provide an excellent heat treatment furnace in terms of economy or energy saving by eliminating the above problems, and has an heating zone and a cooling zone, and is an anoxic heat treatment in which a transfer means of the workpiece is installed. In a heat treatment furnace having an apparatus and a generator for generating a heating gas used as a furnace of the heat treatment apparatus, the apparatus for generating a heating gas can exchange heat with a conveying means of a workpiece to be positioned at a temperature rising part of a heating zone of the treatment apparatus. It is characterized in that it is installed.

That is, the present invention makes it possible to achieve the object by making the heat energy generated in the generator of the exothermic gas available for preheating the object to be treated in the heat treatment apparatus.

Examples will be described below.

2 is a block diagram of one embodiment of the heat treatment furnace of the present invention, the same reference numerals are attached to the same parts as in FIG. 1, and is a tetravalent heating gas generator, which is located at a temperature rising part of the heating zone 11, 41 is a heat exchanger, 22 is a freezer, source gas piping 43, modified gas piping 441, 442, and cooling water piping 451, 452, 453, wastewater piping 46 Is installed.

FIG. 3 is a side view showing the main part of FIG. 2 in cross section, and FIGS. 4A and 4B show the structure of a generator for generating a heating gas, and are longitudinal cross-sectional views perpendicular to each other, with the same reference numerals as in FIG. 2. . The exothermic gas generator 4 is located in a heating zone adjacent to the heating zone 11 of the heat treatment furnace, and is disposed inside an outer wall made of a ceramic fiber member 51 and a refractory lead 52. A gas supply pipe 53 is connected and a combustion burner 54 is provided.

Then, the combustion chamber 56 filled with the catalyst 55 for gas modification and the heat shield plate 57 made of heat-resistant steel or the like communicating with the combustion chamber 56 are insulated from the combustion chamber 56 and meshed. The heat radiating tubes 581 and 582 which are adjacent to the belt 71 and which have a special coating on the surface are excellent. 81 is a furnace wall of the heating zone 11 of the heat treatment furnace, and 82 is a heating element. And 15 represents an exhaust pipe.

When the heat treatment is performed in the heat treatment furnace, the raw material gas in which the combustion air is mixed is supplied to the combustion chamber 56 from the raw material gas pipe 53 at a preset mixing ratio using a flow meter, and is supplied to the combustion chamber 56. I) The mixed gas is burned by the burner 54 for combustion to promote denaturation as the catalyst 55. By this combustion, the modified gas having a thermal energy of about 1,000 ° C. radiates heat from the heat radiating tubes 581 and 582 to preheat the workpiece 72 to about 200 ° C. through the mesh belt 71. The modified gas exiting the heat radiating tubes 581 and 582 is cooled and dehydrated by the cooling water in the heat exchanger 41 and then cooled and dehydrated again in the freezer 22 to adjust the dew point. The modified gas in which the dew point is adjusted is fed to the heating zone 11, the cooling zones 121 and 122, and used as a furnace for an oxidation-free treatment.

Therefore, in this heat treatment furnace, when the object 72 is fed into the furnace as the mesh belt 71, the object 72 is preheated by the radiant heat from the heat radiating tubes 581 and 582, and is then supplied to the heating zone 11.

Hereinafter, specific examples will be described. The heat treatment furnace used here is the heating of a mesh belt type continuous furnace having a furnace body length of 13,360 mm, a belt width of 450 mm, and a capacitance of 120 KVA in which a heat generating gas generator having a gas discharge amount of 60 m 3 / Hr is installed. Device and a gas freezer with a freezing capacity of 60 m3 / Hr, except that the heat treatment furnace and the furnace body have a 16,260 mm electric field, and have the same capacity as the heating device of the same configuration and the heat generating gas-modifying device having the same amount of independent gas generation. The performance comparison with the conventional heat processing furnace which has the gas freezer of was performed. The gas composition ratio of the used modified gas is shown in Table 1.

TABLE 1

By using these heat treatment furnaces, the intermediate annealing of the automotive parts manufactured by cold-breaking having the size of 100 × 100 × 100t was annealed at the heating temperature of 750 ℃, and the throughput was 440kg / Hr and the amount of butane gas 3㎥ / Hr, the amount of cooling water used was 6.4㎥ / Hr. In case of using the conventional furnace, the throughput of 350㎏ / Hr, butane gas is 3㎥ / Hr, and the amount of cooling water is 9.5㎥ / Hr. The same amount was used, and the amount of cooling water used was significantly reduced, resulting in an increase in throughput.

Moreover, the similar comparison was made about the case of copper brazing at brazing temperature of 1130 degreeC. When the treatment weight is 120KVA, the power consumption when using the heat treatment furnace of the present embodiment was 115KVA, the cooling water consumption was 6.0㎥ / Hr. On the other hand, when the conventional heat treatment furnace is used, the power consumption is 130KVA, the cooling water consumption is 12.2㎥ / Since it is Hr, the power consumption is reduced to 10%, and the amount of cooling water used can be reduced to 51%. 5 is a comparison of the heating heat retention effective heat, A is a heat treatment furnace of the present embodiment, B represents a conventional heat treatment furnace, showing that 15KVA of the required power 135KVA is effectively utilized.

6B shows the temperature distribution in the heat treatment apparatus of the present embodiment, and the transverse time and vertical axis show the passage time (minute) and the temperature (° C) in the furnace, respectively, and the side view of the heat treatment apparatus in FIG. Is indicated by a symbol).

In the drawing, C denotes the atmosphere temperature in the furnace measured by thermocouple, D denotes the temperature of the steel plate having dimensions of 100 × 100 × 15t, E denotes the atmosphere temperature in the furnace measured by conventional thermocouple, F Denotes the temperature of the steel sheet having the same dimensions as in the case of D. FIG. As understood from the comparison of these curves, in the heat treatment furnace of this embodiment, since there is a preheating zone, heating of the workpiece is gradually performed, while the range of the heating zone of the workpiece is substantially widened. As a result, the annealing temperature is reached in a short time, so that the conveyance speed can be increased, and the processing capacity can be increased.

On the other hand, in the conventional furnace having the same length as in the embodiment, there is no preheating zone. Therefore, when the object to be processed is conveyed at the same speed as in the embodiment, the heating time is not sufficient, so it is necessary to slow the conveying speed. have. That is, in the heat treatment furnace of this embodiment, since there is a preheating zone of the object to be treated, it is found that even if the conveyance speed is faster than the conventional furnace, the temperature is sufficiently raised to a predetermined temperature, thereby improving the processing capacity.

In addition, the heat radiating tube of the heat generating gas generator is effective to increase the radiation efficiency of heat to the mesh belt by making the surface black or installing a heat radiating fin. Moreover, since the gas supplied from a heat radiating tube to a heat exchanger is about 760 degreeC, it can also be used for the preheating of the air supplied to the combustion chamber of a heat generating gas generator.

That is, the heat treatment furnace of the present embodiment can effectively utilize the thermal energy generated during the generation of the denatured gas, which enables the reduction of the amount of cooling water used and power consumption, and is effective in terms of economical and energy saving, while also providing precision and processing of annealing. It is to improve the ability.

As described above, the present invention enables economic, energy-saving, and effective heat treatment, and has an industrial effect.

Claims (1)

An oxygen-free heat treatment apparatus 1 and a generator for generating a heating gas used as a furnace of the heat treatment apparatus, each having a heating station 11 and a cooling station 121 and 122 and a conveying means for the workpiece 72 is installed. (4) In a heat treatment furnace having a light source, the heat generating gas generator (4) is capable of heat exchange with a transfer means of a workpiece 72 located at a temperature rise portion of the heating zone 11 of the heat treatment apparatus. Heat treatment furnace characterized in that it is installed.