Abstract: Disclosed is a drive wheel set, comprising a common shaft and at least two external rotor motors installed on the common shaft. External rotors of the external rotor motors form drive wheels of the drive wheel set. Also disclosed are a vertical-type wire storage frame, a swing-type wire storage frame, a guide wheel frame, a traction mechanism and a multi-path conveying mechanism using the drive wheel set. The drive wheel set is small in size, occupies less space, and is suitable for a situation where a plurality of motors need to be driven but sufficient space is lacking.

Abstract: The disclosure provides a mercury removal system for a coal-fired power plant comprising: a mercury content monitoring system configured to monitor a mercury concentration in flue gas; a fly ash collecting device configured to collect fly ash from an electrostatic precipitator in the coal-fired power plant; a modifying device configured to be supplied with the collected fly ash and prepare a mercury sorbent from the fly ash; a sorbent injector configured to inject the mercury sorbent into flues of the coal-fired power plant so as to mix and contact with the flue gas in the flue and adsorb the elemental mercury in the flue gas. Thus, the concentration of the mercury pollutant emission is decreased.