JP2000319701A - Device for producing porous material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve production efficiency by loading up articles to be treated in a multistage in a preheating zone and to improve the ratio of the calories consumed to decompose and remove organic components in the treated articles to the calories for heating fixtures for transporting the treated articles. SOLUTION: This device for producing porous material is provided with a preheating zone 1 for decomposing and removing the organic components by heating a base material formed by impregnating an organic porous carrier body with a slurry liquid containing metallic powder and a heating zone 2 for sintering the remaining metallic powder. In the preheating zone, the untreated articles are loaded up in a multistage providing a space between the stages and treated by sending a non-oxidizing atmospheric gas obtained by burning a hydrocarbon-based fuel in an air ratio of <=1 as an atmospheric gas passing through the space between the stages to the preheating zone to accelerate the decomposition and the removal of the organic components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a porous material which can be used for an electrode for a battery, various filters, a catalyst article and the like.

[0002]

2. Description of the Related Art FIG. 3 shows an apparatus for producing a porous material which has been widely known. This figure 3
In the apparatus 1, the airtight preheating chamber 4a
The main part is surrounded by the furnace wall 4, and the main part 1a in the preheating chamber 4a is configured to be heated to 700 to 850 to 900 ° C. by the internal heater 23 or other means. A heating section (for example, a section 2a heated to 1100 ° C.) is formed by partitioning, and a cooling section 32a is arranged around the heating section to form a slow cooling section 32a. From the inlet 7 to the outlet 7a of the preheating chamber 4a, a heat-resistant conveyor (for example, a roller) for transferring processed products is used.
A mesh conveyor 30) supported by 31 is provided, and the upper surface is moved in the direction of arrow 29.

[0003] In this configuration, a well-known treatment is performed by impregnating or applying a treated product 18, for example, a slurried metal powder, to the skeleton surface of a foamed resin such as a sheet-like urethane foam from the inlet 7 and then drying the impregnated resin. Product 18
-17554, known in Japanese Patent Application Laid-Open No. 8-225866, etc.) on the conveyor 30 and introduced into the preheating chamber 4a,
In the preheating chamber 1a, the organic porous carrier in the processed product 18 (material) is heated to decompose and remove organic components, and then the metal powder remaining in the heating chamber 2a is sintered as is well known. It has been practiced to produce a porous metal material having a high porosity.

[0004]

In this conventional apparatus for producing a porous material, as shown in FIG.
On top of this, the processed products 18 are arranged in tandem and passed through the furnace, so that the production amount per hour is limited, and improvement in production efficiency has been desired. In order to improve the production efficiency, it was considered to polymerize a plurality of the treated products 18, but a temperature difference occurred inside and outside the treated products 18, and the carbon component decomposed from the organic component was not sufficiently removed. There is a problem that deformation and distortion often occur. Also, in terms of thermal efficiency, the mesh belt 30 has a smaller amount of heat for heating the processed product 18.
The ratio of wasted heat consumed in heating of the steel is high, and improvement of the heat efficiency has been desired.

The apparatus for producing a porous material of the present application is provided to solve the above-mentioned problems of the prior art. The purpose of the present application is to provide an apparatus for manufacturing a porous material which can improve the production efficiency by stacking the processed products in the preheating section so that organic components of the processed products can be decomposed and removed. It is something to offer. Another object of the present invention is to provide a porous material manufacturing apparatus capable of improving the ratio of the amount of heat consumed for decomposing and removing organic components of a processed product to the amount of heat for heating jigs for transferring the processed product. It is intended to provide. Other objects and advantages will be more readily apparent from the drawings and the following description associated therewith.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a method for heating a material formed by impregnating or coating a slurry containing metal powder on an organic porous carrier to decompose and remove organic components. In an apparatus for producing a porous material comprising a preheating section and a heating section for sintering the remaining metal powder, the preheating section includes a hydrocarbon-based fuel as an atmosphere gas in order to promote the decomposition and removal of the organic matter. Is intended to provide an apparatus for producing a porous substance, in which a non-oxidizing atmosphere gas obtained by burning a gas at an air ratio of 1 or less is sent to a preheating section for processing.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. 1 and 2, reference numeral 1 denotes a preheating furnace, which is surrounded by a furnace wall 4, and an atmosphere gas of 700 to 900 ° C. exists in the room 1a as in the conventional case. Reference numeral 2 denotes a heating furnace, which is surrounded by a furnace wall 5, and an atmosphere gas of about 1100 ° C. exists in the room 2a as in the conventional case. 3 indicates a front room (standby unit), and 6 indicates a compartment. Reference numerals 7 and 7a denote entrances and exits from the charging preparation section 3a and inside the preheating furnace
The receiving frame 12 on which the processed product is placed is transferred toward 1a, is directed to an adjacent cooling room (not shown) via the heating furnace 2, and the receiving frame 12 can be taken out. 8a to 8e show doors of entrances and exits arranged in those paths. Reference numeral 9 denotes the presence of a gas inlet provided at an arbitrary place in the preheating furnace 1, and a processing product 18 described later.
Treated products 18 to promote the decomposition and removal of organic matter in
This is for introducing the non-oxidizing atmosphere gas flowing through the gap between the stages into the room 1a of the preheating unit 1. 10 and 11 are receiving slots 12
Shows a plurality of transfer means provided in the respective chambers for transferring in the direction of the arrow 29, for example, a number of bearings 10b provided on the furnace walls 4, 5, each having a plurality of shaft ends 10a rotatably supported by the shaft ends 10a. The rollers 10 are densely arranged, and the receiving frame 12 can be transferred by rotating the rollers.

The receiving frame 12 is made of a known heat-resistant material.
A space 16 can be formed between the layers. 14 is processed
FIG. 2 shows a perforated shelf frame on which a shelf 18 is placed, and is supported by legs 15 so that multiple layers can be sequentially stacked as shown in FIG. The height of the leg 15 is set so as to form a gap 16 through which the atmospheric gas can flow in the vertical direction or in the direction of the arrow 28 between the steps. These receiving frames 12 are placed on a heat-resistant tray 13 as is well known, and are sequentially transferred in the direction of arrow 29 over the roller row. 20
Indicates a fan, and turns the heat-resistant blades 22 by the motor 21,
This is for creating a flow in the direction of arrow 27 in the room and for flowing the atmospheric gas in the gap 16 between the respective shelves, and the place may be a side wall, or may be arranged outside the room and the inside of the room through the circulation hole. The gas may be circulated. Reference numeral 23 denotes an optional heater for maintaining the temperature of the gas in the room in the preheating furnace 1 and the heating furnace 2 at a predetermined high temperature value.

In the above structure, a well-known organic porous carrier, for example, a sheet of a porous foamed resin contains metal powder on the shelf plate 14 or the tray 13 in the receiving frame 12. The raw material 18 formed by impregnating or applying the slurry liquid and drying is placed thereon, and the raw material 18 is configured in an arbitrary number in multiple stages as shown in FIG. From 3a, they are transferred in tandem in order from the standby section 3, the preheating chamber 1a, the compartment 6 and the heating chamber 2a. In the preheating chamber 1a, a hydrocarbon-based fuel, for example, propane gas, is burned at an air ratio of 1 or less as an atmosphere gas to be passed through the gap 16 between the stages in order to promote the decomposition and removal of organic matter in the carrier. The non-oxidizing atmosphere gas thus obtained is sent from the gas inlet 9 into the room 1a of the preheating unit.
Further, when the room temperature is set to, for example, 850 ° C., the organic substance of the carrier, which is the foaming resin, is thermally decomposed, and the carbon content disappears. In this case, as shown in the figure, even though the processed product 18 has a multi-layered structure, there is a space 16 for gas flow between the upper and lower portions, and the non-oxidizing portion 16 has a high temperature in the space 16. Since the neutral atmosphere gas flows, the processed product 18 is uniformly heated over the entire area, and the carbon generated from the processed product 18 is quickly eliminated. In the above case, when the gas flow in the direction of arrow 28 is created by the fan 20 to assist the emission of carbon, the above-mentioned effect is further increased.

The atmosphere gas in the preheating section 1 is a gas obtained by burning a hydrocarbon fuel at an air ratio of 1 or less, and contains at least a concentration of 2 to 10% carbon monoxide. When the atmosphere gas is charged and treated, not only the above decarburization effect is promoted, but also the treated product
The 18 completed products can be of good quality. That is, as shown in the following Table 1, in the above gas composition ratio, the CO component is 10%.
If the number is larger, in the multilayer processing of FIG. 2, the urethane decomposition state is poor, and the processed product 18 may be slightly deformed. If the CO component is less than 2%, an oxidation phenomenon will be observed.

[Table 1] As described above, the porous treated product 18 after the organic component of urethane as the carrier has disappeared enters the compartment 6 by opening and closing the door 8d, and then opens and closes the door 8e to open the heating chamber. It moves to 2a, and it is heated by a well-known atmospheric gas of 1100 to 1300 ° C., sintered and becomes a porous metal.

[0011]

As described above, the present invention is intended to decompose and remove organic components by heating a material formed by impregnating or coating a slurry containing metal powder on an organic porous carrier. Since the non-oxidizing atmosphere gas obtained by burning the hydrocarbon-based fuel at an air ratio of 1 or less is used as the atmosphere gas, there is an effect that a high quality treated product 18 can be obtained.

Further, the processed products 18 are stacked in multiple stages with a gap provided between the stages, thereby enabling uniform heating of each processed product 18 and quick removal of carbon components between the upper and lower processed products 18. Therefore, there is an effect that the production amount of the high-quality processed product 18 is improved. Furthermore, since the non-oxidizing atmosphere gas is positively circulated by the fan, there is an effect that the production amount of the high-quality processed product 18 is improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view in which a part of a continuous furnace including a preheating furnace and a heating furnace is omitted.

FIG. 2 is a sectional view showing a relationship between the inside of the furnace at a position ii-ii in FIG. 1 and a receiving frame.

FIG. 3 is a schematic sectional view showing a conventional processing furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Preheating furnace 2 Heating furnace 3 Standby part 4 Furnace wall 5 Furnace wall 6 Compartment room 7, 7a Outlet (inlet) 8a-8e Opening door 9 Gas inlet 10 Transfer means 12 Receiving frame 13 Tray 14 Shelf board 15 Leg 16 Void 18 Processed product 20 fans

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4K018 CA44 DA01 DA04 KA22 4K050 AA04 BA01 CA13 CC08 CG09 4K063 AA07 BA15 CA01 CA06 DA07 DA26 DA28

Claims (4)

[Claims] 1. A preheating unit for heating a material formed by impregnating or applying a slurry liquid containing a metal powder on an organic porous carrier to decompose and remove organic components, and a remaining metal powder. In the apparatus for producing a porous material having a heating section for sintering, in a preheating section, a hydrocarbon-based fuel is burned as an atmosphere gas at an air ratio of 1 or less in order to promote the decomposition and removal of the organic matter. An apparatus for producing a porous material, wherein the non-oxidizing atmosphere gas obtained as described above is sent to a preheating section for processing. 2. A preheating section for decomposing and removing organic components by heating a material formed by impregnating or coating a slurry liquid containing metal powder on an organic porous carrier, In a manufacturing apparatus for a porous material provided with a heating unit for sintering, in the preheating unit, the materials are stacked in multiple stages with a gap provided between the stages, and decomposition and removal of the organic matter are promoted. In order to do so, a non-oxidizing atmosphere gas obtained by burning a hydrocarbon-based fuel at an air ratio of 1 or less as an atmosphere gas to be passed through the gap between the stages is sent to the preheating unit for processing. An apparatus for producing a porous material. 3. The atmosphere gas in the preheating section is a gas obtained by burning a hydrocarbon fuel at an air ratio of 1 or less, and contains at least a concentration of 2 to 10% carbon monoxide gas. 3. The apparatus for producing a porous substance according to claim 1, wherein the processing is performed by charging an atmospheric gas. 4. The preheating unit according to claim 1, wherein the non-oxidizing atmosphere gas is positively circulated by a fan in a space between the materials stacked in multiple stages. Or the manufacturing apparatus of 3 porous materials.