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Semi-passing honeycomb ceramic grain filter and preparation method thereof

A particulate filter and honeycomb ceramic technology, applied in the field of material science, can solve the problems such as the semi-pass type honeycomb ceramic particulate filter that has not been reported, and achieve the effect of large removal rate, uniform distribution of micropores, and energy saving.

Inactive Publication Date: 2016-08-10
NANJING KERUI SPECIAL CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the filters related to POC technology are usually in the form of metal mesh, metal fiber, foam ceramics, etc., and there is no report on the half-through honeycomb ceramic particle filter.

Method used

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  • Semi-passing honeycomb ceramic grain filter and preparation method thereof
  • Semi-passing honeycomb ceramic grain filter and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First prepare 27 parts of kaolin with an average particle size of 3 μm (parts by mass, the same below), 39 parts of flake talc with an average particle size of 13 μm, 16 parts of alumina with an average particle size of 4 μm, and 8 parts of fused silica powder with an average particle size of 8 μm , 12 parts of methyl methacrylate pore-forming agent particles with an average particle size of 35 μm, the water-soluble binder used is 6 parts of hydroxypropyl methylcellulose, 32 parts of water and other raw materials.

[0025] Then fully mechanically mix and knead the prepared raw materials to make them uniform, then degas and refine them three times under a vacuum degree of 95KPa, and stale for 24 hours to obtain plastic clay.

[0026] The plastic mud is formed into a cylindrical wet body through a mold mechanical extrusion machine. The cross section of the mold is circular, the outer diameter is 267mm, and the hole density is 300 holes / square inch; the length of the wet bo...

Embodiment 2

[0032] The addition of pore-forming agent particle methyl methacrylate in embodiment 1 is reduced to 6 parts from 12 parts, and other raw material addition and preparation process are all identical with embodiment 1, to the sample detection result that makes is:

[0033] The appearance size, wall thickness, etc. are the same as the sample in Example 1, but the porosity is 45%, the average pore diameter of micropores is 9 μm, the wall thickness is 0.3 mm, the compressive strength is greater than 19 MPa, and the thermal expansion coefficient is 1.0×10 -6 / ℃, thermal shock resistance 550 ℃, removal rate of particulate matter in flue gas 50%. It shows that reducing the amount of methyl methacrylate added has a certain decrease in the porosity of the sample, the average pore size of micropores and other indicators, and also caused a reduction in the filtration rate of particulate matter.

Embodiment 3

[0035] The pore-forming agent in embodiment 1 is replaced methyl methacrylate with starch, and its addition, other raw materials and addition, and preparation process are all identical with embodiment 1, to the sample detection result that makes is:

[0036] The appearance size, wall thickness, etc. are the same as the sample in Example 1, but the porosity is 50%, the average pore diameter of micropores is 11 μm, the wall thickness is 0.3 mm, the compressive strength is 19 MPa, and the thermal expansion coefficient is 1.0×10 -6 / ℃, thermal shock resistance 560 ℃, the removal rate of particulate matter in flue gas is 55%. Compared with the measurement results of the sample in Example 1, it is shown that the effect of using starch as a pore-forming agent is not as good as that of methyl methacrylate.

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Abstract

The invention provides a semi-passing honeycomb ceramic grain filter and a preparation method thereof. A filter is made of honeycomb ceramic with blocking holes alternately crossed at one end and no block hole at the other end. The raw material comprises the following components in parts by weight: 25-30 parts of flake kaolin, 15-20 parts of alumina powder, 37-40 parts of flake talcum, 6-10 parts of fused quartz powder, 8-20 parts of pore forming materials, 3-10 parts of water-solubility binder and a defined amount of water. The preparation method comprises the following steps: mechanically mixing and uniformly kneading the raw materials; performing vacuum processing on the mixture for 2-3 times at the vacuum degree of 90-95KPa and then ageing for 20-40h, thereby acquiring plastic slurry; extruding a honeycomb ceramic wet green body in a certain size through a mold; performing microwave drying for 2h at 8-12Kw, cutting and trimming, thereby acquiring a dry green body; increasing the temperature according to the procedure and sintering into a semi-finished product at high temperature; and mechanically stripping the irregular outer wall of the green body, performing skin-grafting again, performing microwave drying, crossing the blocking holes at single end at intervals and then performing microwave drying, thereby acquiring a finished product.

Description

technical field [0001] The invention relates to a half-through honeycomb ceramic particle filter and a preparation method thereof, belonging to the field of material science. Background technique [0002] The combination of DOC (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter) technology is currently the most effective and mature method to remove particulate matter in the exhaust of heavy-duty diesel vehicles. However, due to the easy clogging of DPF and poor passive regeneration, it makes it application is limited. [0003] The POC (Particulate Oxidation Catalyst) developed in recent years is a method that combines DOC technology with a unique filter technology. This type of filter has a lower back pressure than the traditional DPF. Due to the partial filter effect and passive regeneration (on the wall The C particulate matter can pass through the NO in the exhaust gas 2 Oxidized to CO 2 , to regenerate the filter), which can reduce the particulate matter i...

Claims

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Application Information

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IPC IPC(8): B01D46/24B01D46/00C04B38/00C04B35/16
CPCB01D46/2455C04B38/00C04B2111/00793C04B2111/42B01D46/80C04B35/16
Inventor 孔秋明陈明祥孔德双谷昌军孔亮明孔令仁
Owner NANJING KERUI SPECIAL CERAMICS
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