Magnetic oxygen carrier based solid fuel chemical-looping combustion system and technology

A technology of chemical looping combustion and solid fuel, which is applied in the direction of fluidized bed combustion equipment, fuel for combustion in a molten state, and combustion methods, etc. It can solve the problems of difficult separation of solid mixtures, low transfer volume and utilization efficiency of oxygen carriers, and achieve The effect of effective separation and efficient separation

Active Publication Date: 2013-01-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

Although this kind of reactor has a high gas conversion efficiency, in the solid fuel chemical looping combustion system, due to the limitation of its structure and working principle, there are problems such as the difficulty of separating the solid mixture, resulting in the transfer amount of oxygen carrier and the Utilization efficiency is low, and there is still a long way to go to realize large-scale operation

Method used

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  • Magnetic oxygen carrier based solid fuel chemical-looping combustion system and technology

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Embodiment 1

[0029] use figure 1 The structure of the dual electromagnetic control device shown. The solid fuel is lignite, the oxygen carrier is natural iron ore, and the fuel reactor 2 and the air reactor 1 are circulating fluidized bed reactors. Coal and hot Fe 2 o 3 Fully mixed in the fuel reactor 2, and violent gasification reaction and redox reaction occur; part of Fe 2 o 3 is reduced to Fe 3 o 4 Finally, under the action of the second electromagnetic control device 4, with the unreduced Fe 2 o 3 and other solid particles are separated from the fuel reactor 2 into the air reactor 1; Fe 3 o 4 In the air reactor 1 and O 2 reaction and is oxidized to Fe 2 o 3 , and under the action of the first electromagnetic control device 3, with unoxidized Fe 3 o 4 Separation, from the air reactor 1 into the fuel reactor 2, so as to complete the cycle of oxygen carrier. In the 100h experiment, the burnout rate of lignite reached 99%, and the loss rate of iron ore was 3%.

Embodiment 2

[0031] γ-Al 2 o 3 As a support, Fe was prepared by an isometric impregnation method 2 o 3 / γ-Al 2 o 3 As the oxygen carrier, lignite was used as solid fuel, and the chemical looping combustion experiment was carried out by the same process as in Example 1. In the 100h experiment, the burnout rate of lignite reached 99%, Fe 2o 3 / γ-Al 2 o 3 The loss rate of oxygen carrier was 1.5%.

Embodiment 3

[0033] Taking anthracite as solid fuel, the Fe prepared in Example 2 2 o 3 / γ-Al 2 o 3 as an oxygen carrier, and the same process as in Example 2 was used to carry out a chemical looping combustion experiment. In the 100h experiment, the burnout rate of anthracite reached 98.5%, Fe 2 o 3 / γ-Al 2 o 3 The loss rate of oxygen carrier was 1.5%.

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Abstract

The invention belongs to the technical field of chemical-looping combustion, and particularly relates to a magnetic oxygen carrier based solid fuel chemical-looping combustion system and technology. The system is based on the characteristic that during the oxidation-reduction reaction of an iron-based oxygen carrier, Fe2O3 in high valence state is nonmagnetic and Fe3O4 in low valence state is magnetic; and electromagnetic control devices are adopted to separate an oxygen carrier with Fe3O4 in low valence state from a fuel reactor and send the oxygen carrier to an air reactor, meanwhile separate an oxygen carrier with Fe2O3 in high valence state from the air reactor and sent the oxygen carrier to the fuel reactor, so that the chemical-looping combustion of coal, biological substances and other solid fuels is realized. Through adopting an electromagnetic separation device, the system not only realizes the efficient separation of the oxygen carrier and solid particles such as unburned solid fuels and burnout ash residues during the direct chemical-looping combustion of solid fuel, but also realizes the effective separation of Fe2O3 in high valence state and Fe3O4 in low valence state, so that the oxygen carrier is efficiently and fully utilized.

Description

technical field [0001] The invention belongs to the technical field of chemical looping combustion, and in particular relates to a solid fuel chemical looping combustion system and process based on a magnetic oxygen carrier. Background technique [0002] In recent years, the trend of global warming has been increasing, and various natural disasters have also increased significantly. A large number of studies have shown that this is closely related to the use of fossil fuels by humans. While fossil fuels such as coal, oil and natural gas provide more than 85% of the world's energy consumption, they also produce a large amount of greenhouse gases during the combustion and utilization process, which is a major cause of the greenhouse effect. The influential "Kyoto Protocol" formulated by the Kyoto Conference in 1997 stipulates six main greenhouse gases: CO 2 、CH 4 , N 2 O. NFC S 、PFC S , SF 6 , where CO 2 The contribution of the increase to the enhancement of the green...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/28
CPCY02E20/34
Inventor 董长青梁志永覃吴胡笑颖肖显斌高攀
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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