Fe3Al metal powder filter element is a porous filter element based on Fe3Al intermetallic compound powder, which is prepared through isostatic pressing, vacuum high temperature sintering, special welding and other processes. Because it has many uniformly distributed pores, it is used in filtration and separation fields. Has a wide range of uses. The Fe3Al filter element adopts an asymmetric composite structure, has excellent high temperature vulcanization corrosion resistance, good high temperature strength, can be used for a long time at 700 ℃, filtration accuracy is as high as 0.3 μm, and the solid content after filtration is less than 20 ppm. At the same time, this product has a large pass It has the characteristics of large volume and excellent back-blowing regeneration performance.
The Fe3Al filter element is particularly suitable for precision filtration and gas-solid separation under high temperature, high pressure and corrosive environments. It is used in fields involving direct purification and dust removal of dust-containing gas at high temperatures, such as integrated gasification combined cycle power generation (IGCC) in the energy industry. Process) high-temperature gas, high-temperature synthesis gas from coal chemical industry pulverized coal gasification process, high-temperature gas from metallurgical industry blast furnace and converter, high-temperature reaction gas from petrochemical and chemical industry, high-temperature exhaust gas from glass industry, high-temperature exhaust gas from boilers and incinerators, etc. Fe3Al filter elements can be used for high temperature dust removal and purification.
Fe3Al intermetallic compound is a low-density material between metal and ceramic. It is called "semi-ceramic". It has good ductility, high strength, good processing performance, high thermal shock resistance, It can be welded and has the advantages of good thermal stability, high oxidation resistance and corrosion resistance, and good wear resistance. The Fe3Al filter element adopts the asymmetric structure of the framework layer and the working layer. The framework layer powder is coarser, the pore size is larger, the thickness is thicker, and the strength is higher. It mainly plays a supporting role; the working layer powder is finer, the pore size is smaller, and the thickness is thinner , Mainly plays a filtering role. The length of the Fe3Al filter element is 1500-2000mm, the filtration accuracy is 0.3μm, the filtration efficiency is more than 99.9%, the average corrosion weight gain is less than 1mg/cm2 under the environment of 450℃ and 3% H2S, the pressure difference is less than 40KPa, and the crushing strength is more than 60MPa. The highest normal use temperature reaches 700℃; under normal working conditions, the continuous service life exceeds 1 year, and the filter element can be reused many times after being cleaned and regenerated offline. Compared with similar domestic metal filter products, the Fe3Al metal powder filter element is a porous element made of pre-alloyed Fe3Al powder as a raw material to achieve complete uniform alloying. The material does not contain elemental Fe or elemental Al or severe component segregation. , So it has better corrosion resistance and high temperature mechanical properties; compared with similar ceramic filter products of international head enterprises, Fe3Al metal powder filter has higher strength, toughness and thermal shock resistance, and has higher performance in field application The stability and reliability.
The Fe3Al metal powder filter element is prepared by powder metallurgy technology. At present, a complete process specification and testing standard have been established, and the corresponding enterprise standard Q/HDATK0093-2014 "high temperature and corrosion resistant metal filter tube" has been formed, mainly related to national testing technology The standard is: GB/T 5249-85 permeable sintered metal material-determination of bubble test pore size, GB/T 5250-93 permeable sintered metal material-determination of fluid permeability, GB/T 5164-85 permeability Sintered metal materials-measurement of open porosity, GB/T 6804-2008 measurement of radial crushing strength of sintered metal bushes, etc.
The Fe3Al metal powder filter element passed the expert review and appraisal organized by the China Petroleum and Chemical Industry Association in December 2011. The experts at the meeting agreed that the product technology reached the international advanced level.
On February 22, 2013, the Fe3Al metal powder filter element developed by BJAT successfully obtained the authorization of Shell Company and became the only manufacturer of fly ash filter elements in China authorized by Shell Company. At present, the Fe3Al metal powder filter element has been promoted to 10 Shell coal gasification users, and good field application effects have been achieved on the fly ash filter. The overall performance and service life of the product have exceeded the level of similar imported filter elements.