A device for producing sponge iron by coupling pressurized gasification and gas-based shaft furnace

Abstract

The utility model discloses a kind of pressurized gasification and gas-based shaft furnace coupling production sponge iron's device, the device includes pressurized gasification and mixing system, high-temperature dust removal desulfurization system, high-pressure gas-based reduction iron system and furnace top gas circulation processing system, pressurized gasification and mixing system includes gasifier and mixer, and mixed gas is obtained by the mixer to the synthesis gas generated by gasifier and the furnace top gas of gas-based shaft furnace;High-temperature dust removal desulfurization system carries out dust removal and high-temperature desulfurization to mixed gas;High-pressure gas-based reduction iron system includes gas-based shaft furnace, and sponge iron is obtained by using mixed gas to handle pellet iron ore;Furnace top gas circulation processing system converts carbon monoxide in the furnace top gas of gas-based shaft furnace into hydrogen, and is transported to pressurized gasification and mixing system.The utility model in integration gasification system, high-temperature gas dust removal desulfurization system, gas-based shaft furnace system and and furnace top gas circulation processing system, reduce energy loss, and reduce the quality influence of sulfur to sponge iron product.

Claims

1. An apparatus for producing sponge iron by coupling pressurized gasification with a gas-based vertical shaft furnace, characterized in that, It includes a pressurized gasification and mixing system (10), a high-temperature dust removal and desulfurization system (20), a high-pressure gas-based reduced iron system (30), and a furnace top gas circulation treatment system (40), among which The pressurized gasification and mixing system (10) includes a gasifier (11) and a mixer (12). The mixer (12) outputs a mixed gas obtained by mixing the syngas generated by the gasifier (11) and the top gas output by the top gas circulation treatment system (40) to the high temperature dust removal and desulfurization system (20). The high-temperature dust removal and desulfurization system (20) includes a high-temperature cyclone dust collector (21) and a high-temperature dust removal and desulfurization device (22), which are used to perform dust removal and high-temperature desulfurization on the mixed gas received from the pressurized gasification and mixing system (10) through the high-temperature cyclone dust collector (21) and the high-temperature dust removal and desulfurization device (22); The high-pressure gas-based reduced iron system (30) includes a gas-based vertical shaft furnace (31) for receiving mixed gas after treatment by the high-temperature dust removal and desulfurization system (20), and using the mixed gas to process iron pellets to obtain sponge iron; The top gas circulation treatment system (40) receives the top gas from the gas-based vertical furnace (31), converts the carbon monoxide in the top gas into hydrogen, and transports the treated top gas to the pressurized gasification and mixing system (10).

2. The apparatus for producing sponge iron by coupling pressurized gasification and a gas-based vertical furnace according to claim 1, characterized in that, The furnace top gas circulation treatment system (40) includes a heat exchange device (41), a washing and dust removal device (42), a hydrocarbon regulation device (43), a gas purification device (44) and a heat exchange device (41) connected in sequence. The high-temperature gas channel of the heat exchange device (41) is connected to the washing and dust removal device (42), and the low-temperature gas channel of the heat exchange device (41) is connected to the gas purification device (44). The heat exchange equipment (41) is used to transport the furnace top gas to the washing and dust removal equipment (42) through the high temperature gas channel; The washing and dust removal equipment (42) is used to remove dust from the furnace top gas and then transport it to the hydrocarbon conditioning equipment (43); The hydrocarbon regulation device (43) is used to convert all the carbon monoxide in the furnace top gas into hydrogen. The gas purification device (44) receives the mixed gas output from the hydrocarbon regulating device (43), purifies the mixed gas, outputs the carbon dioxide in the mixed gas through the recovery port, and transports the remaining mixed gas to the heat exchange device (41). The heat exchange device (41) is used to receive the mixed gas output from the gas purification device (44) through the low temperature gas channel, heat the mixed gas output from the gas purification device (44) through the high temperature gas channel, and deliver the heated mixed gas to the pressurized gasification and mixing system (10).

3. The apparatus for producing sponge iron by coupling pressurized gasification and a gas-based vertical furnace according to claim 2, characterized in that, The furnace top gas circulation treatment system (40) also includes a compression device (45), which is connected to the gas purification device (44) and the heat exchange device (41). The compression device (45) compresses the mixed gas output from the gas purification device (44) and outputs it to the heat exchange device (41).

4. The apparatus for producing sponge iron by coupling pressurized gasification and gas-based vertical furnace according to claim 1, characterized in that, The high-temperature dust removal and desulfurization equipment (22) includes a high-temperature dust removal and desulfurization furnace, a feed tank and a solid slag cooling tank.

5. The apparatus for producing sponge iron by coupling pressurized gasification and a gas-based vertical furnace according to claim 4, characterized in that, The feed tank contains a desulfurizing agent, which enters the high-temperature dust removal and desulfurization furnace from top to bottom; the lower part of the high-temperature dust removal and desulfurization furnace includes a mixed gas inlet, and the upper part includes a mixed gas outlet; the mixed gas after dust removal and desulfurization is output from the mixed gas outlet, and the resulting solid slag enters the solid slag cooling tank downwards.

6. The apparatus for producing sponge iron by coupling pressurized gasification with a gas-based vertical furnace according to any one of claims 1-5, characterized in that, The mixer (12) is connected to the gasifier (11) and the top gas recirculation system (40), receiving the synthesis gas generated by the gasifier (11) and the top gas recirculation system (40).

7. The apparatus for producing sponge iron by coupling pressurized gasification and a gas-based vertical furnace according to claim 6, characterized in that, The mixer (12) includes an inlet valve for adjusting the ratio of syngas to furnace top gas entering the mixer (12).

8. The apparatus for producing sponge iron by coupling pressurized gasification and a gas-based vertical furnace according to claim 2, characterized in that, The washing and dust removal equipment (42) includes a Venturi scrubber and a gas scrubbing tower. The Venturi scrubber is connected to the heat exchange equipment (41) to perform atomized washing and dust removal on the furnace top gas. The dust-removed furnace top gas enters the gas scrubbing tower and is washed and dust-removed through a water bath and a tower tray.

9. The apparatus for producing sponge iron by coupling pressurized gasification and a gas-based vertical furnace according to claim 2, characterized in that, Gas purification equipment (44) is used to remove carbon dioxide and hydrogen sulfide from the top gas of the furnace.

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