Purifying silencing ceramic carrier

Abstract

The invention relates to a ceramic carrier with purifying and noise reducing functions and the preparing method thereof, characterized in that: natural stacked ball holes interconnected and millimeter-sized are inside the ceramic carrier, and the preparing method comprises prefabricating burn-out small balls with the required aperture, naturally stacking and filling module space of the set shape, pouring ceramic slurry, drying and burning. As compared with the ceramic cellular carrier, it has characters of large contact specific surface area, good purifying effect, strong structural strength, simple to manufacture, and having purifying and noise reducing functions, and it is a novel fuel oil engine tail gas purifying and noise reducing carrier.

Description

technical field [0001] The invention relates to the improvement of the ceramic purification carrier used in the engine, in particular to a ceramic carrier with both purification and noise reduction functions. Background technique [0002] So far, engines such as automobile exhaust purification basically use ceramic honeycomb as the carrier. However, because the ceramic honeycomb carrier has a straight through hole structure, the exhaust gas passes through a straight straight channel, most of which "pass through the bore", making the components in the exhaust gas that need to be purified less likely to contact the pore wall, resulting in an unsatisfactory purification effect. In order to increase the purification effect, people can only increase the catalytic area, so the honeycomb pore size is made as small as possible and the wall is as thin as possible. For example, in order to meet the requirements of the Euro III standard for exhaust emissions, the honeycomb is made into...

AI Technical Summary

Problems solved by technology

Thin-wall fine-pore honeycomb not only increases the mechanical strength and lower expansion coefficient requirements of ceramics, but its technical difficulty is extremely difficult. Therefore, in actual use, the wall is often too thin to withstand stress, mechanical vibration and temperature fluctuations. The thermal stress generated is enough to make it break and lose its function. Usually, the honeycomb can only meet the thermal shock resistance of 650°C air cooling once without cracking, and the mechanical strength is generally only 12Mpa, which limits the improvement of honeycomb performance; The difficulty of compression molding production increases, the actual production yield is low, and the cost of the carrier is increased

Furthermore, the through-hole structure of the ceramic honeycomb carrier makes the main function only as a catalyst carrier to purify exhaust gas, and its noise reduction effect is relatively poor, so it is difficult to achieve exhaust gas purification and noise reduction

[0003] Ceramic honeycomb carrier, due to its large length and cylindrical structure, is the only production method that adopts extrusion molding. However, thin-walled pores make extrusion molding production very difficult, and the actual production yield is low, making the production cost of the product relatively high.

[0004] Although it is possible to manufacture porous ceramics with tortuous through holes by soaking sponge or mixing powdered loss-of-ignition agents (such as flour, sphen, carbon powder, etc.), but its pore size is small and its resistance is large, so it can only be used as a filter element. Use, can not be used as exhaust gas purification silencer

[0005] Therefore, due to the requirements of use and the difficulty and method of ceramic manufacturing, in fact, the only existing fuel engine purification and noise reduction carrier can only be extruded to make a honeycomb structure with through holes. This has been the case at home and abroad for a long time, and has not been able to get changed