Winding-structured engine tail gas processing device with metal as carrier

Abstract

The invention relates to a rotational processor which uses metal as carrier to purify the tail gas of diesel engine and petrol engine. Wherein, it is formed by a frame, a rotational metal carrier, an airflow swirler and a baffle; the front and back ends of frame (1) have inlet cover (3) and outlet cover (13); the inlet cover (3) has an inlet connecting tube (2); the outlet cover (13) has an outlet connecting tube (14); the frame (1) is connected at the middle of ventilate tube of engine via the inlet connecting tube (2) and the outlet connecting tube (14), to form a sealed catalysis reactor space; the rotational metal carrier is divided into the catalysis first level and the catalysis second level (15), while the first level comprises the first catalysis crinkle band (5), and the second level (15) comprises the second catalysis crinkle band and the third catalysis crinkle band (11). The invention has high catalytic efficiency.

Description

technical field [0001] The invention belongs to the field of automobile tail gas treatment, and relates to a spiral structure processor which uses metal as a carrier and can purify the tail gas of diesel and gasoline engines. technical background [0002] With the increase of diesel engines and the strengthening of people's awareness of environmental protection, the problem of air pollution caused by diesel engines has become increasingly prominent. The existing diesel engine exhaust control countermeasure technology includes three aspects: engine technology, post-treatment technology and fuel technology. Among them, post-treatment technology is the most important and key. Post-treatment technology refers to the treatment of engine emissions before entering the atmosphere to further reduce NO x and PM pollutant emission technologies, there are four main post-treatment technologies: oxidation catalyst technology, particulate trap (or particulate filter) technology, NO x Cat...

AI Technical Summary

Problems solved by technology

Although the honeycomb ceramic carrier has the characteristics of small thermal expansion coefficient, good thermal shock resistance, excellent compressive strength and vibration resistance, it still has its inherent disadvantages, that is, the honeycomb ceramic material has the characteristics of anisotropy, and its radial expansion The coefficient is twice that of the lateral expansion coefficient, and the particles are easy to deposit in the air intake channel, so the regeneration process is unevenly heated and prone to thermal shock damage (as shown in Table 1); and there are currently no manufacturers of honeycomb ceramic materials in China, we need It is very expensive to import from abroad, so we choose metal materials as the carrier of the catalyst, which is economical and can avoid some shortcomings of ceramic carriers

[0006] As early as the early 1960s, the United States developed the first generation of metal honeycomb carrier catalysts. Its carrier is composed of flat and corrugated metal sheets stacked and wound into cylindrical substrates and shells. However, due to the lack of bonding technology between metal sheets and between the substrate and the shell at that time, the experiment was not successful

In the future, cross stem fixing at both ends and brazing, etc. were adopted, but the required durability requirements were not yet met.

Until the 1980s, the vacuum brazing process was used to bond the metal sheet and the substrate and the shell, thereby solving the problem of fixing the metal carrier, but there are still many disadvantages, the purification efficiency of the exhaust gas is not very high, and the engine exhaust system High pressure resistance and short catalyst life

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