Superfine coal dust oxygen-enriched combustion technology and system

Abstract

The invention discloses a superfine coal dust oxygen-enriched combustion technology and system in the technical field of energy conservation and emission reduction. The technology comprises the following steps of: preparing superfine coal dust with an average particle size of less than 20 microns, and burning in an oxygen-enriched environment with overall concentration kept at 27-35% (v / v); extracting part of the hot flue gas in a flue at the rear part of a deduster; and circularly preparing superfine coal dust by taking the extracted flue gas and oxygen as combustion-supporting mediums again. According to the technology and system disclosed by the invention, the superfine coal dust is applied to the oxygen-enriched combustion technology, and the advantages of the two are effectively combined to realize an effect of using advantages and bypassing disadvantages; and the superfine coal dust oxygen-enriched combustion technology finishes efficient trapping of CO2 and is a new coal dust combustion technology with good combustion property and better pollutant discharge performance, and surely becomes an emerging technology for pollutant cooperative removal deserving vigorous promotion.

Description

technical field [0001] The invention relates to a method and device in the technical field of energy saving and emission reduction, in particular to an ultrafine coal powder with an average particle size of less than 20 μm in O 2 The combustion process and system in which the overall concentration is kept at 27% to 35%. Background technique [0002] Carbon dioxide (CO2) produced during coal combustion 2 ), nitrogen oxides (NOx) and sulfides (SOx), etc. have great harm to the human environment, and have attracted the attention of various countries. For nitrogen oxides and sulfides that can cause direct harm such as acid rain and photochemical smog, many researchers at home and abroad have carried out a lot of research and obtained many beneficial results. for CO 2 The resulting greenhouse effect has only been recognized in recent years. Although it started late, the international community has paid great attention to this aspect. As early as 1992, the United Nations Confe...

AI Technical Summary

Problems solved by technology

The fourth option is a recovery of CO 2 It is a new way to eradicate NOx generation, but this technology is still in the initial stage of exploration in the world, and it is difficult to become a new method for CO in the near future. 2 The main measures to reduce emissions

In addition, the oxyfuel combustion technology can greatly reduce NOx emissions, largely due to the reduction of NOx in the circulating flue gas, but this technology does not consider the flue gas circulation, which greatly reduces the effect of NOx emission reduction

[0007] Third, for O 2 / CO 2 Combustion, due to the need to blend and control pure oxygen, making the boiler load regulation worse

Since there is no addition of circulating flue gas, the loss of exhaust gas cannot be reduced

[0008] Fourth, for O2 / CO2 combustion, due to the presence of reducing media, the water wall of the furnace and the convection heating surface are more prone to high-temperature corrosion and slagging, and this technology does not consider the possible impact of the mixing ratio on this problem

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