Abstract: The present invention relates to an MMC converter system which can quickly cut off fault current by installing a plurality of disconnecting switch units on a line connected between two MMC converter devices. The MMC converter system comprises: a first MMC converter device including a plurality of serially connected sub modules; a second MMC converter device including a plurality of serially connected sub modules; a first disconnecting switch unit installed on a line between the first and second MMC converter devices; and a second disconnecting switch unit connected in series to the first disconnecting switch unit on the line, wherein each of the first and second disconnecting switch units comprises a mechanical switch installed on the line so as to open and close the line and a diode connected in parallel to the mechanical switch, and the two diodes are installed in opposite directions to each other.

Abstract: The present invention relates to an MMC converter system which can quickly cut off fault current by installing a plurality of disconnecting switch units on a line connected between two MMC converter devices. The MMC converter system comprises: a first MMC converter device including a plurality of serially connected sub modules; a second MMC converter device including a plurality of serially connected sub modules; a first disconnecting switch unit installed on a line between the first and second MMC converter devices; and a second disconnecting switch unit connected in series to the first disconnecting switch unit on the line, wherein each of the first and second disconnecting switch units comprises a mechanical switch installed on the line so as to open and close the line and a diode connected in parallel to the mechanical switch, and the two diodes are installed in opposite directions to each other.

Abstract: The present invention relates to a metal filter for purifying the exhaust gas from a ship, and a preparation method thereof. The purpose of the present invention is to provide: a metal filter for purifying the exhaust gas from a ship, capable of reducing nitrogen oxide by 85% or more at 250-300° C.; and a preparation method thereof. The metal filter for removing nitrogen oxide contained in the exhaust gas from a ship of the present invention comprises an integrated catalyst, wherein a metal substrate comprising irregularities is coated with a low temperature active catalyst in which vanadium (V), tungsten (W) and alumina sol are supported in a Ti-pillared clay (Ti-PILC) powdered support.

Abstract: The present invention relates to a metal filter for purifying the exhaust gas from a ship, and a preparation method thereof. The purpose of the present invention is to provide: a metal filter for purifying the exhaust gas from a ship, capable of reducing nitrogen oxide by 85% or more at 250-300° C.; and a preparation method thereof. The metal filter for removing nitrogen oxide contained in the exhaust gas from a ship of the present invention comprises an integrated catalyst, wherein a metal substrate comprising irregularities is coated with a low temperature active catalyst in which vanadium (V), tungsten (W) and alumina sol are supported in a Ti-pillared clay (Ti-PILC) powdered support.

Abstract: Corrosion resistant multi-layered clad plates or sheets with high bonding strength is disclosed. According to the present invention, clad metals with high corrosion resistance such as Ti, Nb, V, or Zr and their alloys can be bonded with a cheap substrate such as Fe, Cu, or Ni and their alloys by the resistance seam welding. Using the insert metal causing the eutectic reaction, the clad metal can be strongly bonded with the substrate. Especially, corrosion resistant clad plates with excellent bonding strength can be fabricated by controlling the thickness and the microstructures of the eutectic reaction layer at the interface between the clad metal and the substrate or between the clad metal and the insert metal.

Abstract: Disclosed are a structure of multi-layered clad plates and sheets for corrosion resistance and a fabricating method thereof. Provided are clad plates and sheets for corrosion resistance in which Ni, Co, Ti, Ni, V, and Zr having an excellent corrosion resistance, or an alloy thereof are bonded to cheap Fe, Cu, or an alloy thereof. Chemical compositions of the clad metals and structures of the clad plates and sheets are easily modified with service conditions of the clad plates and sheets. Also, this invention provides a more cost-effective method based on a. resistance seam welding process for fabricating the corrosion-resistant clad plates and sheets.

Abstract: Disclosed are a structure of multi-layered clad plates and sheets for corrosion resistance and a fabricating method thereof. Provided are clad plates and sheets for corrosion resistance in which Ni, Co, Ti, Nb, V, and Zr having an excellent corrosion resistance, or an alloy thereof are bonded to cheap Fe, Cu, or an alloy thereof. Chemical compositions of the clad metals and structures of the clad plates and sheets are easily modified with service conditions of the clad plates and sheets. Also, this invention provides a more cost-effective method based on a resistance seam welding process for fabricating the corrosion-resistant clad plates and sheets.

Abstract: Disclosed are a structure of multi-layered clad plates and sheets for corrosion resistance and a fabricating method thereof. Provided are clad plates and sheets for corrosion resistance in which Ni, Co, Ti, Ni, V, and Zr having an excellent corrosion resistance, or an alloy thereof are bonded to cheap Fe, Cu, or an alloy thereof: Chemical compositions of the clad metals and structures of the clad plates and sheets are easily modified with service conditions of the clad plates and sheets. Also, this invention provides a more cost-effective method based on a resistance seam welding process for fabricating the corrosion-resistant clad plates and sheets.