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

Patent metadata

Field	Value
Publication number	US-12054795-B2
Application number	US-202218284415-A
Country	US
Kind code	B2
Filing date	Nov 29, 2022
Priority date	Sep 22, 2022
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A system and method deliver fluidized powder based on flue gas carrying waste slag and instant cooling steel slag. A first flue gas pipeline receives pressurized CO2-rich flue gas and in fluid communication with a fluidization air pipeline, a pressurization air pipeline and a supplementary air pipeline respectively and through them enters an upper discharge bin; a second flue gas pipeline receives the pressurized CO2-rich flue gas and in fluid communication with a gas-gas mixer, a dense phase discharge guide pipe first end extends into the upper discharge bin and receives high-pressure dense phase gas-powder flow of CO2-rich flue gas, and a dense phase discharge guide pipe second end is connected to the gas-gas mixer; a variable-pitch twin screw sealed conveyor discharge end extends into an upper discharge bin internal space, and is provided with an upwardly inclined gas-blocking segment.

First claim

The invention claimed is:

1. 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 CO 2 -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 CO 2 -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 CO 2 -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.

2. The system according to claim 1 , wherein:
the steel slag powder bin is provided with a discharge weighing signal collector, a support frame of the upper discharge bin is connected to a weighing meter, the weighing meter is connected to a weighing signal collector of the upper discharge bin, the discharge weighing signal collector and the weighing signal collector of the upper discharge bin are both in communication connection with a control terminal.

3. The system according to claim 1 , wherein:
a communication pipeline between the dense phase discharge guide pipe and the gas-gas mixer is provided with at least one first visual observation window;
a communication pipeline between the secondary mixer and the device for combined quenching, alkali removal and magnetic heat recovery treatment of converter slag is provided with at least one second visual observation window.

4. The system according to claim 1 , wherein:
a top of the device for combined quenching, alkali removal and magnetic heat recovery treatment of converter slag is provided with a liquid steel slag trough; a double-layer air jet magnetic separation conveyor is configured to receive a quenched slag product output from a discharge port of the device for combined quenching, alkali removal and magnetic heat recovery treatment of converter slag.

5. The system according to claim 1 , wherein:
the upper discharge bin is provided with a bin pressure gauge in communication with the control terminal.

6. The system according to claim 1 , wherein:
a top of the upper discharge bin is opened with a through hole in communication with a vent line, the vent line is provided with a vent valve in communication with the control terminal, each pipeline is provided with pressure sensors, flowmeters, and electric valves.

7. The system according to claim 1 , wherein:
the fluidization air pipeline is in fluid communication with a bottom of the upper discharge bin, the pressurization air pipeline is in fluid communication with the top of the upper discharge bin, and the supplementary air pipeline is in fluid communication with a middle or near-middle position of the upper discharge bin.

8. A slag quenching production line, comprising a system for delivering fluidized powder based on flue gas carrying waste slag and instant cooling steel slag according to claim 1 .

9. A method for delivering fluidized powder based on flue gas carrying waste slag and instant cooling steel slag, using a system for delivering fluidized powder based on flue gas carrying waste slag and instant cooling steel slag according to claim 1 , comprising:
feeding waste slag powder that meets the requirements by a variable-pitch twin screw sealed conveyor; accumulating the waste slag powder at a gas-blocking segment and sealing a discharge end of the variable-pitch twin screw sealed conveyor; and falling the waste slag powder into an internal space of an upper discharge bin under the extrusion of rear materials;
introducing pressurized CO 2 -rich flue gas into the upper discharge bin via a first flue gas pipeline, a fluidization air pipeline, a pressurization air pipeline and a supplementary air pipeline; fluidizing the waste slag powder in the upper discharge bin by a bin fluidizer to obtain fluidized slag powder;
introducing the fluidized slag powder meeting quality concentration requirements into a gas-gas mixer through a dense phase discharge guide pipe;
introducing the pressurized CO 2 -rich flue gas into the gas-gas mixer through a second flue gas pipeline; and mixing the fluidized slag powder with the pressurized CO 2 -rich flue gas in the gas-gas mixer;
mixing and intensifying the output from the gas-gas mixer in a secondary mixer to form a raw gas carrying flue gas and waste slag after instant cooling; and

introducing the raw gas carrying flue gas and waste slag after instant cooling into a device for combined quenching, alkali removal and magnetic heat recovery treatment of converter slag.

10. The method according to claim 9 , wherein:
automatically replenishing pressurized air and supplementary air based on a pressure signal fed back from a bin pressure gauge of the upper discharge bin;
collecting data of the amount of steel slag powder discharged per unit time from the upper discharge bin by a weighing signal collector of the upper discharge bin and transmitting the data to a control terminal; and automatically comparing the data with the data collected by a discharge weighing signal collector of the steel slag powder bin and judging the smoothness of the steel slag powder feeding and discharging.

Assignees

• Univ Shandong
• Qingdao Daneng Environmental Prot Equipment Co Ltd
• Qingda Low Carbon Green Hydrogen Industrial Tech Research Institute Qingdao Co Ltd

Inventors

• Chang Jingcai
• Wang Yong
• Ma Chunyuan
• Zhang Lianhai
• Li Shusheng
• Wang Rui
• Hong Jinglan
• Zhang Jiahao

Classifications

• G01N2001/002

  Devices for supplying or distributing samples to an analysing apparatus · CPC title

• C21B2200/00

  Recycling of non-gaseous waste material · CPC title

• C21B2400/062

  Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag · CPC title

• C21B2400/026

  using air, inert gases or removable conductive bodies · CPC title

• C21B2400/08

  with energy recovery · CPC title