Microwave drying method of honeycomb formed bodies

A technology of microwave drying and sintering, which is applied in the directions of drying solid materials, heating to dry solid materials, and drying, etc., which can solve the problems of inability to obtain, difficult to fully reduce the drying speed difference, etc.

Active Publication Date: 2006-03-01
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

When performing microwave drying of honeycomb sintered body, introduce steam and hot air into the drying furnace, and raise the ambient temperature to, for example, 80°C to reduce heat dissipation, or increase microwave output to reduce heat dissipation. To try to achieve uniformity of drying speed, but even these methods are difficult to sufficiently reduce the difference in drying speed, and can not obtain a satisfactory effect of suppressing deformation to a certain extent, which is the status quo

Method used

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  • Microwave drying method of honeycomb formed bodies
  • Microwave drying method of honeycomb formed bodies
  • Microwave drying method of honeycomb formed bodies

Examples

Experimental program
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Effect test

Embodiment

[0066] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

reference example 1

[0068] After mixing talcum powder, pottery clay, bauxite, binder, water, etc., kneading (kneading) and soil refining (soil refining), use the obtained clay to make a diameter of 120mm and a length of 200mm by extrusion. , the wall thickness is about 100μm, and the number of compartments is about 300 / in 2 (about 46 / cm 2 ) honeycomb sintered body. The sintered body was arranged longitudinally (the axial direction of the compartment is the state of the up and down direction) in a batch type microwave drying oven (heating efficiency 0.5), and was irradiated with microwaves with a frequency of 2.45 GHz at an output density of 1 kW / kg for 300 seconds to dry . In addition, in this example, the ratio of the incident density of microwaves incident on the honeycomb sintered body from the vertical direction to the incident density from the horizontal direction is estimated to be about 1:1 (A / (A+B)0.5).

[0069] after drying, yes Figure 11 The outer peripheral portion 11 and the inn...

reference example 2

[0071] After mixing talcum powder, pottery clay, bauxite, binder, water, etc., kneading and smelting, use the obtained clay to make a diameter of 120mm, a length of 200mm, a wall thickness of about 100μm, and a The number of chambers is about 300 / in 2 (about 46 / cm 2 ) honeycomb sintered body. The sintered body was set longitudinally (the state where the axial direction of the compartment is the up-down direction) in a batch-type microwave drying oven (heating efficiency 0.5), and irradiated with microwaves with a frequency of 2.45 GHz at an output density of 0.5 kW / kg for 600 seconds to carry out dry. In addition, in this example, the ratio of the incident density of microwaves incident on the honeycomb sintered body from the vertical direction to the incident density from the horizontal direction is estimated to be about 1:1 (A / (A+B)0.5). after drying, yes Figure 11 The outer peripheral portion 11 and the inner portion 13 of the honeycomb sintered body 1 shown in , meas...

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Abstract

A method for drying a honeycomb formed body using microwaves is provided. The method can reduce the difference in the drying speed inside the honeycomb formed bodies during the drying process and can dry the honeycomb formed bodies without cell deformation. The method comprises placing the honeycomb formed body in a drying furnace with the cell axis in the vertical direction and irradiating the honeycomb with microwaves at a frequency of 300-30,000 MHz. The difference of the water content in the vertical direction of the honeycomb formed body 1 is maintained at 0.3% per mm or less during microwave irradiation.

Description

technical field [0001] The present invention relates to a method of drying a honeycomb sintered body using microwaves. Background technique [0002] Honeycomb structures are widely used not only as catalyst supports and various filters, but also recently as a diesel particulate filter (DPF) for capturing particulate matter discharged from a diesel engine. [0003] This type of honeycomb structure generally uses ceramics as the main component, and is usually manufactured using the following manufacturing method: adding water and various additives to the ceramic raw material and making it into a clay shape, and then extruding it into a honeycomb The shape of the sintered body (sintered honeycomb body) is dried and then fired to form a honeycomb structure. [0004] As the drying method of the honeycomb sintered body, there are known the induction drying method which uses the high-frequency energy generated by the current between the electrodes arranged above and below the hone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B3/347
Inventor 寺泽达矢岛田尚幸久野泰治樱井隆行
Owner NGK INSULATORS LTD
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