System and method for delivering fluidized powder based on flue gas carrying waste slag and instant cooling steel slag

A system for delivering fluidized powder based on flue gas carrying waste slag and instant cooling steel slag, comprising at least:

• a variable-pitch twin screw sealed conveyor, a first flue gas pipeline, a second flue gas pipeline, an upper discharge bin, a steel slag powder bin and a device for combined quenching, alkali removal and magnetic heat recovery treatment of converter slag;
• a first end of the first flue gas pipeline is configured to receive pressurized CO2-rich flue gas, a second end of the first flue gas pipeline is in fluid communication with a fluidization air pipeline, a pressurization air pipeline, and a supplementary air pipeline respectively, the fluidization air pipeline, the pressurization air pipeline and the supplementary air pipeline are in fluid communication with the upper discharge bin respectively;
• a first end of the second flue gas pipeline is configured to receive the pressurized CO2-rich flue gas, a second end of the second flue gas pipeline is in fluid communication with a gas-gas mixer, a first end of a dense phase discharge guide pipe is configured to extend into the upper discharge bin to receive high-pressure dense phase gas-powder flow of CO2-rich flue gas, and a second end of the dense phase discharge guide pipe is in fluid communication with the gas-gas mixer;
• the gas-gas mixer is in fluid communication with a secondary mixer;
• the secondary mixer is in fluid communication with the device for combined quenching, alkali removal and magnetic heat recovery treatment of converter slag;
• a feeding end of the variable-pitch twin screw sealed conveyor is configured to receive steel slag powder from a discharge end of the steel slag powder bin;
• a discharge end of the variable-pitch twin screw sealed conveyor is configured to extend into an internal space of the upper discharge bin;
• the discharge end of the variable-pitch twin screw sealed conveyor is equipped with an upwardly inclined gas-blocking segment, and an inside bottom of the upper discharge bin is provided with a bin fluidizer.