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Method of honeycomb molding pretreatment for burning and system for honeycomb molding pretreatment for burning

A molded body and pretreatment technology, which is applied to ceramic molding machines, furnace types, and drying solid materials, etc., can solve problems such as slowing down the heating rate, damage, and large environmental loads, and achieves suppression of deformation, suppression of deformation, and short drying Effect

Inactive Publication Date: 2009-10-21
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of the degreasing method of evaporating and thermally decomposing the binder by heating the formed honeycomb body, a large amount of decomposition gas (CO 2 etc.), so the load on the environment is large
In addition, due to the intense heat generation when the adhesive is thermally decomposed, there is a problem that a temperature difference occurs inside the honeycomb molded body, which easily causes defects such as deformation and damage.
In order to eliminate such problems, the heating rate can be slowed down to suppress internal heat generation, but there is a disadvantage that the processing time becomes very long

Method used

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  • Method of honeycomb molding pretreatment for burning and system for honeycomb molding pretreatment for burning
  • Method of honeycomb molding pretreatment for burning and system for honeycomb molding pretreatment for burning
  • Method of honeycomb molding pretreatment for burning and system for honeycomb molding pretreatment for burning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0100] Prepare figure 2 The honeycomb molded body 1 (outer diameter x flow path length: 80mm x 100mm, cell density: 50 cells / cm 2 , Partition wall thickness: 0.3mm). For prepared honeycomb moldings, use image 3 In the continuous processing apparatus 10 having the configuration shown, pre-firing treatment (drying) was performed under the conditions shown in Table 1. Here, the lengths in the traveling direction of the zone (1) 11, the zone (2) 12, and the zone (3) 13 in the continuous processing apparatus 10 are 1.0 m, 1.0 m, and 1.0 m, respectively. In addition, the conveying speed in the continuous processing apparatus 10 was 0.33 m / min. Table 1 shows the mass (initial mass (g)) before the firing pretreatment of the honeycomb formed body, the mass (g) after the treatment, and the mass reduction rate (%). In addition, in Figure 5 Shows a graph plotting the relationship between superheated steam temperature (region (2)) (°C) and mass reduction rate (%). As shown in Tabl...

Embodiment 9～12

[0108] A honeycomb formed body (dried body) (outer diameter x flow path length: 150 mm x 200 mm) obtained by drying under the same conditions as in Example 3 except that the treatment time was 40 mm was prepared. The prepared honeycomb formed body was subjected to pre-firing treatment (degreasing) under the conditions shown in Table 3. Table 3 shows the mass (initial mass (g)) before the firing pretreatment of the honeycomb formed body, the post-treatment mass (g), and the mass reduction rate (%). In addition, in Image 6 Represents a graph plotting the relationship between superheated steam temperature (°C) and mass reduction rate (%). As shown in Table 3, regardless of the conditions, the mass of the treated honeycomb formed body decreased, and its color changed from white to gray. In addition, the honeycomb formed body obtained by processing under the conditions of Examples 9 and 10 was in a slightly brittle state, and a certain amount of care was required in handling. O...

Embodiment 13

[0112] Prepare figure 2 Honeycomb molded body with the shape shown, made of ceramic raw materials and binders and other molding aids (outer diameter x flow path length: 113mm x 210mm, cell density: 93 cells / cm 2 , Partition wall thickness: 0.1mm). For prepared honeycomb moldings, use Figure 7 with Figure 8 The drying device 21 of the honeycomb formed body of the shown configuration performs drying. Here, the superheated steam inlet 25 provided in the lower part of the honeycomb formed body 41 is not used. Microwaves with a frequency of 2.45 GHz were irradiated for 300 seconds at an output density of 5 kW / kg. The temperature of the superheated steam atmosphere in the processing chamber 22 was 130°C. In addition, the conveying speed of the belt conveyor 28 was 0.32 m / min. For the honeycomb formed body in the drying process, the temperature change was measured at the center point A (inner A) of the upper end surface and the position B (peripheral portion B) at 10 mm from...

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Abstract

A method in which an unburned honeycomb molding which has been formed from a raw-material composition comprising a raw ceramic material, water, and a binder and has cells serving as fluid channels and separated by partitions is subjected to a pretreatment for burning. The method includes a first step in which 100-150 DEG C overheated water vapor is passed through the cells to heighten the temperature of the honeycomb molding and then the overheated water vapor being passed is kept at a temperature which is not lower than the temperature of the overheated water vapor having been passed through the cells and is not higher than 200 DEG C. By the method of honeycomb molding pretreatment for burning, the honeycomb molding can be pretreated prior to burning in a shorter time while inhibiting the occurrence of troubles such as deformation and breakage.

Description

technical field [0001] The present invention relates to a method of pre-firing a honeycomb formed body which is an unfired body of a honeycomb structure. Background technique [0002] Honeycomb structures are widely used in catalyst supports, various filters, and the like. Recently, a diesel particulate filter (DPF) for capturing particulate matter discharged from a diesel engine has also attracted attention. [0003] Most honeycomb structures are usually based on ceramics. When manufacturing such a honeycomb structure, firstly, various additives such as water and a binder are added to the ceramic raw material to make clay, and then extruded to produce a honeycomb-shaped molded body (honeycomb molded body) . The honeycomb formed body is dried and then fired to produce a honeycomb structured body. [0004] As a drying method for the formed honeycomb body, there are known: a dielectric drying method in which a current is passed between electrodes arranged above and below t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/638
CPCC04B2111/00793F26B2210/02F26B21/006C04B35/64C04B35/638B28B11/243C04B38/0006F26B3/02C04B2235/606C04B2111/0081B28B11/241C04B35/01C04B35/515C04B38/068C04B40/0222
Inventor 林伸三樱井隆行
Owner NGK INSULATORS LTD
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