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CN-121974771-A - Metallurgical flue gas recycling process method based on chemical chain technology

CN121974771ACN 121974771 ACN121974771 ACN 121974771ACN-121974771-A

Abstract

The invention belongs to the technical field of metallurgical flue gas recycling, and particularly discloses a metallurgical flue gas recycling method based on a chemical chain technology, which adopts a carbon capturing device, a steam supplementing device, a purifying device, a hydrogen generating device, a heat device, an oxidation reactor, a reduction reactor and an oxygen carrier, and adsorbs CO 2 in flue gas through the carbon capturing device, the water vapor generated by the reduction reactor enters the oxidation reactor together, under the catalytic reaction of the oxygen carrier, chemical raw material products such as methane, methanol or ethanol and the like are efficiently produced, and meanwhile, the reacted oxygen carrier enters a reduction reactor to react with H 2 and release lattice oxygen for recycling, and the heat released by the reaction is recycled through a heat device. The invention breaks through the bottleneck of high energy consumption of the traditional chemical technology by coupling the oxidation-reduction cycle of the chemical chain oxygen carrier with the flue gas purification, carbon capture and hydrogen production technology, and has the advantages of simple flow, high product yield, low energy consumption, high carbon resource utilization rate and the like.

Inventors

  • WU JINGCHUAN
  • XIAO JIAYU
  • LI WEIFENG
  • LI ZHENFA
  • LIANG GUANG

Assignees

  • 重庆赛迪热工环保工程技术有限公司

Dates

Publication Date
20260505
Application Date
20260119

Claims (10)

  1. 1. The metallurgical flue gas recycling process method based on the chemical chain technology is characterized by comprising the following steps of: Introducing metallurgical flue gas into a carbon capturing device to capture CO 2 , and conveying the captured CO 2 to an oxidation reactor; In the oxidation reactor, the oxygen carrier is utilized to catalyze CO 2 to react with the water vapor to generate methane, methanol or ethanol, and the oxygen carrier is oxidized and conveyed to the reduction reactor; the hydrogen is provided to the reduction reactor through the hydrogen generating device, the hydrogen reduces the oxygen carrier in the reduction reactor, lattice oxygen in the oxygen carrier is released, water vapor is generated, the reduced oxygen carrier is conveyed back to the oxidation reactor to form cyclic utilization, and meanwhile, the water vapor generated by the reduction reactor is purified by the purifying device and is conveyed back to the oxidation reactor to be used as a reactant.
  2. 2. The metallurgical off-gas recycling process based on chemical looping technology according to claim 1, further comprising the steps of: The heat generated by the oxidation reactor and/or the reduction reactor is collected by a heat device, one part is used for supplying heat to the reactor, and the other part is used for a metallurgical process.
  3. 3. The metallurgical flue gas recycling method based on the chemical chain technology, which is characterized in that the oxygen carrier consists of an active component, a load component and a catalytic component, wherein the active component consists of one or more of ferric oxide, manganese oxide, copper oxide, nickel oxide and cobalt oxide, the mass fraction of the load component is 30-50%, the load component consists of one or more of aluminum oxide, active carbon and molecular sieve, the mass fraction of the load component is 40-80%, and the catalytic component consists of one or more of an iron compound, a copper compound, a nickel compound, a manganese compound, a zinc compound, a cobalt compound and a vanadium compound, and the mass fraction of the load component is 1-3%.
  4. 4. The metallurgical flue gas recycling process based on chemical looping technology as set forth in claim 1, wherein the carbon capture device captures CO 2 by solution absorption, solid adsorption or membrane separation, and the CO 2 capturing efficiency is greater than 90%.
  5. 5. The metallurgical flue gas recycling method based on the chemical looping technique according to claim 1, wherein the purity of CO 2 obtained by the carbon capturing device is more than 99vol%, the temperature range is 25-1000 ℃, and the pressure range is 0.1-10 MPa (a).
  6. 6. The metallurgical flue gas recycling method based on the chemical looping technique as set forth in claim 1, wherein the steam supplementing device supplements water at a steam pressure ranging from 0.1 MPa (a) to 10MPa (a) and a temperature ranging from 100 ℃ to 1000 ℃.
  7. 7. The metallurgical fume recycling process method based on chemical looping technology as set forth in claim 6, wherein the steam supplementing device supplements water vapor into the oxidation reactor by using a steam ejector or connecting a factory steam pipeline through a pipeline, thereby ensuring that the oxidation reaction in the oxidation reactor is carried out normally.
  8. 8. The method for recycling metallurgical flue gas according to claim 1, wherein the purity of the water vapor purified by the purifying device is >99vol%.
  9. 9. The metallurgical fume recycling process method based on chemical looping technology as set forth in claim 1, wherein the hydrogen production device is an electrolyzed water hydrogen production device, a fossil fuel hydrogen production device or an industrial by-product gas hydrogen production device.
  10. 10. The metallurgical fume recycling method based on chemical looping technology as set forth in claim 9, wherein the purity of hydrogen produced by the hydrogen production device is greater than 99vol%, the temperature is 25-500 ℃, and the pressure is 0.1-5 MPa (a).

Description

Metallurgical flue gas recycling process method based on chemical chain technology Technical Field The invention belongs to the technical field of metallurgical flue gas recycling, and relates to a metallurgical flue gas recycling method based on a chemical chain technology. Background The metallurgical industry is a typical energy resource intensive and high carbon emission industry, producing carbon emissions of about 15% of the total national carbon emissions. The green low carbon is the key for realizing transformation, upgrading and high-quality development in the metallurgical industry, and is an important engine for improving the competitiveness of the industry. The carbon emission reduction technology in the metallurgical industry at present mainly comprises the following steps: (1) Blast furnace top gas circulation and smelting reduction technology based on flow reconstruction; (2) Hydrogen metallurgy, biomass metallurgy, and electrometallurgical technologies based on renewable energy substitution; (3) Carbon capture, utilization and sequestration (CCUS) technology based on end treatment. According to the International Energy Agency (IEA) research report, it is expected that 34% of carbon emissions remain after the metallurgical industry applies process improvement and raw material substitution and other carbon reduction means in 2050, and the CCUS technology is a key guarantee for achieving the dual carbon objective. The current carbon capture technology focusing solution absorption method and solid adsorption method have higher technical maturity and are applied on an industrial scale, but the utilization of CO 2 is limited by the defects of high energy consumption, long flow, low yield and the like of the existing chemical technology, and the resource utilization is less. Disclosure of Invention In view of the above, the invention aims to solve the problems of long flow, high energy consumption, low yield and the like of the existing CO 2 recycling process and provide a metallurgical flue gas recycling method based on a chemical chain technology. In order to achieve the above purpose, the present invention provides the following technical solutions: a metallurgical flue gas recycling process method based on a chemical chain technology comprises the following steps: Introducing metallurgical flue gas into a carbon capturing device to capture CO 2, and conveying the captured CO 2 to an oxidation reactor; In the oxidation reactor, the oxygen carrier is utilized to catalyze CO 2 to react with the water vapor to generate methane, methanol or ethanol, and the oxygen carrier is oxidized and conveyed to the reduction reactor; the hydrogen is provided to the reduction reactor through the hydrogen generating device, the hydrogen reduces the oxygen carrier in the reduction reactor, lattice oxygen in the oxygen carrier is released, water vapor is generated, the reduced oxygen carrier is conveyed back to the oxidation reactor to form cyclic utilization, and meanwhile, the water vapor generated by the reduction reactor is purified by the purifying device and is conveyed back to the oxidation reactor to be used as a reactant. Oxygen carrier in processIs reduced to by a reduction reactorAnd then oxidized in an oxidation reactor to form an oxidation-reduction chemical chain reaction cycle. Further, the method also comprises the following steps: The heat generated by the oxidation reactor and/or the reduction reactor is collected by a heat device, one part is used for supplying heat to the reactor, and the other part is used for a metallurgical process. The oxygen carrier is composed of an active component, a load component and a catalytic component, wherein the active component is one or more of metal oxides such as ferric oxide, manganese oxide, copper oxide, nickel oxide and cobalt oxide, the mass fraction is 30-50%, the load component is one or more of aluminum oxide, active carbon and molecular sieve, the mass fraction is 40-80%, and the catalytic component is one or more of iron compound, copper compound, nickel compound, manganese compound, zinc compound, cobalt compound and vanadium compound, and the mass fraction is 1-3%. Further, the carbon capturing device adopts a CO 2 capturing technology by a solution absorption method, a solid adsorption method or a membrane separation method, and the CO 2 capturing efficiency is more than 90%. Further, the purity of CO 2 obtained by the carbon capturing device is more than 99vol%, the temperature range is 25-1000 ℃, and the pressure range is 0.1-10 MPa (a). Further, the steam supplementing device supplements water steam with the pressure range of 0.1-10 MPa (a) and the temperature range of 100-1000 ℃. Further, the steam supplementing device adopts a steam ejector or is connected with a steam pipeline in a factory through a pipeline to supplement water steam into the oxidation reactor, so that the normal oxidation reaction in the oxidation reactor is ensured. Furth