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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 oxygen carrier transfer volume and utilization efficiency, and achieve The effect of effective separation and efficient separation

Active Publication Date: 2015-04-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Effect test

Embodiment 1

[0029] use figure 1 The structure of the dual electromagnetic control device shown. The solid fuel is lignite, and the oxygen carrier is natural iron ore. The fuel reactor 2 and the air reactor 1 are both circulating fluidized bed reactors. Coal powder 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 Afterwards, under the action of the second electromagnetic control device 4, the unreduced Fe 2 O 3 And other solid particles separated from the fuel reactor 2 into the air reactor 1; Fe 3 O 4 Neutralize O in air reactor 1 2 Oxidized to Fe by reaction 2 O 3 , And under the action of the first electromagnetic control device 3, with the unoxidized Fe 3 O 4 Separate and enter the fuel reactor 2 from the air reactor 1 to complete the circulation of the 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] Take γ-Al 2 O 3 As a carrier, Fe is prepared by an equal volume impregnation method 2 O 3 / γ-Al 2 O 3 As the oxygen carrier, lignite was used as the solid fuel, and the chemical chain combustion experiment was carried out using the same process as in Example 1. In the 100h experiment, the burnout rate of lignite reached 99%, Fe 2 O 3 / γ-Al 2 O 3 The oxygen carrier loss rate is 1.5%.

Embodiment 3

[0033] Using anthracite as solid fuel, Fe prepared in Example 2 2 O 3 / γ-Al 2 O 3 It is an oxygen carrier, and the same process as in Example 2 is used for the chemical chain combustion experiment. In the 100h experiment, the burnout rate of anthracite reached 98.5%, Fe 2 O 3 / γ-Al 2 O 3 The oxygen carrier loss rate is 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 chain combustion, and specifically relates to a solid fuel chemical chain combustion system and process based on a magnetic oxygen carrier. Background technique [0002] In recent years, the global warming trend has become increasingly intensified, 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 process, which is a major cause of the greenhouse effect. Six major greenhouse gases are stipulated in the influential "Kyoto Protocol" formulated by the Kyoto Conference in 1997: CO 2 , CH 4 , N 2 O, NFC S , PFC S , SF 6 , Where CO 2 The contribution of the increase in the greenhouse effect is about 70%, so ...

Claims

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Application Information

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Patent Type & Authority Patents(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)