JPS58123801A - Heat treatment furnace combined with gas converting section in one body - Google Patents

Abstract

PURPOSE:To reduce the consumption of energy and the floor space of equipment by providing a reacting cylinder for generation of converted gases in a body of a heat treatment furnace thereby combining a converting furnace and a sintering furnace, etc. into one body. CONSTITUTION:A muffle 12 which is opened at both ends is provided in a body 11 of a heat treatment furnace, and a reacting cylinder 15 for generation of converted gases which is heated by heating elements is mounted on the outside circumference of the muffle 12. The cylinder 15 is formed of double pipes of an inside cylinder 16 and an outside cylinder 17, and a gas passage 18 is formed between both cylinders 16 and 17. An introducing pipe for gaseous raw materials is penetrated into a flange 21 stuck to the cylinder 17 and while the gaseous mixture fed into said pipe passes through the inside of the cylinder 17, the same is brought into contact with catalysts 23, and is thereby converted. The converted gases are passed into the passage 18 between the cylinder 16 and the cylinder 17, and are fed into the muffle 12 through a vent pipe 20. By such mechanism, the co-possession of the heating elements for heat treatment and the heating elements for reaction is made possible, and the consumption of energy is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat treatment furnace with an integrated gas conversion section.

Examples of heat treatment furnaces that use modified gas include sintering furnaces for producing powder metal parts. In a sintering furnace, a mixed gas of hydrocarbon gas and air is passed through a catalyst heated to 1000° C. or higher to be converted into an endothermic gas, and then sintered in an atmosphere of the converted gas. Therefore,
Conventionally, as shown in FIG. 1, a shift furnace 1 and a sintering furnace 2 were provided separately, and the shift gas generated in the shift furnace 1 was guided into the sintering furnace 2 through a conduit 3.

The above-mentioned shift conversion furnace 1 is equipped with a reaction tube 4 filled with a catalyst, a heating element 5 for heating the catalyst, and a cooler 6 for preventing generation of soot in the converted gas. The gas λ and air are mixed by a mixer 7, and the mixed gas is fed into the reaction tube 4 through a blower 8.

The mixed gas is converted into an endothermic gas by a catalyst inside the reaction tube 4, and the converted gas passes through the cooler 6 and is sent into the sintering furnace 2 through the conduit 3. The sintering furnace 2 has a heating element 9 therein, and is configured to sinter the processed material placed on a belt conveyor 10 in a protective atmosphere of the above-mentioned modified gas.

Although the conventional device is constructed as described above, this device has the following problems.

Yama: Because the conversion furnace and sintering furnace are independent, heat loss occurs in two places due to heat dissipation in the furnace wall and furnace lid.

(2) Requires installation space for the transformation furnace and sintered clay, and requires equipment costs for each.

(3) It is necessary to manage the operation of both the conversion furnace and the sintering furnace.

As described above, in the conventional apparatus, the conversion furnace and the sintering furnace are separated and independent, and therefore there are various problems.

Therefore, the purpose of this invention is to provide a heat treatment furnace that integrates a conversion furnace and a coalescence furnace.

Hereinafter, the configuration of the present invention will be explained based on FIG. 2 and subsequent figures.

The heat treatment furnace according to the present invention includes 1. As shown in Figure 2:...
(.

In the heat treatment furnace body 11, there is a matsufuru 12 with both ends open.
A belt conveyor 13 such as a mesh belt is passed through the inside of the belt conveyor 13. In addition, the top and bottom of the above Matsuful 12,
That is, heating elements 14.1 are placed along the top and bottom walls of the furnace body 11.
4 is provided to heat the processed material on the conveyor 13 through the Matsufuru 12.

A reaction tube 15 is attached to the outer periphery of the Matsufuru 12 described above. The mounting position of the reaction tube 15 is selected at a location that does not increase the cross-sectional area of the furnace body 11 and does not impede the uniformity of the temperature distribution given to the processed material. For example, as shown in FIGS. 3 and 4, it is attached diagonally to the upper part of the matsufuru 12.

The reaction tube 11 is composed of a double tube consisting of an outer tube 16 and an inner tube 17, and a gap between the two tubes 16 and 17 forms a gas passage 18. The open end (right end in the figure) of the outer cylinder 16 passes through the seventh flange 19 of the pine full 12, and is integrated with the second flange 19 at the penetrating portion. The closed end (the left end in the figure) of the outer cylinder 16 is in an unrestricted state to allow thermal expansion, and the intermediate part is attached to the pine full 12 via a suitable support fitting. In addition, a ventilation pipe 20 is provided in a part of the outer cylinder 16, which communicates the passage 18 with the inside of the matsufuru 12.
(See Figure 4).

One end of the inner cylinder 17 is fixed to the inner surface of a flange 21 that closes the open end of the outer cylinder 16, and by removing the 7 flange 21 from the outer cylinder 16, the inner cylinder 17 can be extracted. . Partition plates 22 are provided inside the inner cylinder 17 at regular intervals, and the spaces between the partition plates 22 are filled with a catalyst 23. Ventilation holes 24 are provided at the closed end of each partition plate 22 and the inner cylinder 17, and the positions of the ventilation holes 24 are alternately arranged. The raw material gas introduction pipe 25 passes through the flange 21 to which the inner cylinder 17 is fixed, so that the mixed gas fed by the blower 26 flows into the inner cylinder 1.
While passing through the inside of the cylinder 7, it touches the catalyst 23 and is transformed, and the transformed gas passes through the passage between the outer cylinder 16 and the inner circumference 17,
It is fed into the Matsufuru 12 from the ventilation pipe 20.

The above is a type that uses the Matsufuru 12 and attaches the reaction tube 15 to the Matsufuru 12.
may be omitted, the conveyor 13 may be allowed to pass through the interior of the furnace body 11 as is, and the reaction tube 15 may be attached to the interior of the furnace body 11 by appropriate means. In addition, the reaction tube 15
does not necessarily have to be a double pipe (1, basically, it may be composed only of the above-mentioned inner pipe 17).

Furthermore, in the above example, the modified gas is directly introduced into the Matsufuru 12 from the vent pipe 20, but the Matsufuru 12
Before being introduced into the furnace body 11, the gas may be drawn out of the furnace main body 11 through an appropriate conduit, passed through an appropriate cooler or gas composition regulator, and then introduced into the furnace main body 11.

The experimental results are shown in Tables 1 and 2.

Table 1 shows the quality of sintered products produced by the conventional device and the device of the present invention, the components of which are Fe-1,5%Cu-
Q, 5% C molding density is 6.8 g/cd. Table 2 also shows product weight 150 Q/Hr and gas flow rate 65
It shows the power consumption of each device at rrl/Hr.

These experimental results show that the device of the present invention is equivalent to the conventional device in terms of quality, but 17% lower in terms of power consumption.
It will be understood that only KWH/H can be saved.

Table 1 Quality Table 2 Power consumption (V, WH/H) As described above, the present invention includes a reaction cylinder for generating converted gas heated by the heating element inside the heat treatment furnace main body that has a heating element inside. As a result, the heating element for heat treatment and the heating element for reaction can be shared, reducing energy consumption, reducing equipment installation space, and reducing the number of operational management points. It is possible to achieve effects such as reducing the obvious equipment costs.

Note that the converted gas may be drawn out of the heat treatment furnace body once, but it can also be introduced directly into the main body from the outlet side of the reaction tube without being drawn out. In that case, the energy required to reheat the gas is reduced. becomes unnecessary.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, FIG. 2 is a sectional view of a device according to the present invention, and FIG. 3 is a partially enlarged cross-sectional plan view of FIG.
FIG. 4 is a partially enlarged longitudinal sectional side view of FIG. 2. 11... Sintering furnace main body, 14... Heating element, 15...
Reaction cylinder, 16... Outer cylinder, 17... Inner cylinder, 18...
Passageway, 20... Ventilation pipe Patent applicant: Sumitomo Electric Industries, Ltd. 11゜ Agent: Kama 1) Text 2 Figure 1 Figure 2 Figure 3 Figure 4 ==-1

Claims (1)

[Scope of Claims] , 11 A reaction cylinder for generating a converted gas heated by the heating element L is provided inside a heat treatment furnace body having a heating element therein, and a raw material gas introduction part is provided on the inlet side of the reaction cylinder. A heat treatment furnace integrated with a gas conversion part, characterized in that the outlet side thereof is communicated with the inside of the heat treatment furnace main body. (:2) The gas conversion unit according to claim 1, wherein the outlet side of the reaction cylinder and the inside of the heat treatment furnace main body are communicated through a conversion gas cooling unit and a component adjustment unit. Integrated heat treatment furnace.