Method for preparing semicoke supported multi-element nano metal oxide desulfurization and denitrification adsorbing agent

Abstract

The invention provides a method for preparing a semicoke supported multi-element nano metal oxide desulfurization and denitrification adsorbing agent. The method is characterized in that brown coal is used as the raw material, and pyrolysis and steam gasification are performed on the brown coal under N2 atmosphere by performing ultrasonic-assisted impregnation on metal salts serving as active component precursors to prepare a semicoke supporter and redistribute active components so as to directly obtain semicoke supported multi-element nano metal oxide. The method has the advantages that the low-metamorphic-grade brown coal relatively rich in reserves and the cheap metal nitrate are used as the raw materials prepare the desulfurization agent, and the method is wide in raw material source and low in production cost; compared with impregnation supporting using the semicoke supporter, the method simplifies the operation flow of early coke-making, reduces energy consumption, avoids supporting capacity reduction caused by pore structure changes caused by the fact that pore passages are blocked by tar and the like, is beneficial to the sufficient and even distribution of the active components on the surface of the supporter, increases the desulfurization precision of the desulfurization agent and increases the effective desulfurization time of the desulfurization agent.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a method for preparing a semi-coke-loaded multi-component nano-metal oxide desulfurization and denitrification adsorbent by using lignite as a raw material. The adsorbent can be applied to H in gas 2 S and COS, and SO in flue gas x and NO x Integrated removal. Background technique [0002] my country is a country with primary energy resources dominated by coal, and my country's power production is dominated by thermal power generation, and coal-fired power plants emit a large amount of SO through flue gas. 2 , NO X , mercury, particles and other trace elements, are the emission of SO X , NO X High coal consumption, low efficiency, and heavy pollution lead to an increase in the concentration of air particulate matter and increased smog. In the 1960s and 1970s, the United States, Japan and European developed countries were the first to formulate a series of poli...

AI Technical Summary

Problems solved by technology

For example, patent 201210293989.0 discloses a kind of pressure impregnation and pyrolysis activation using lignite. The desulfurizer has a good desulfurization effect, but the corresponding gasification is not carried out in the preparation process, resulting in poor pore structure of the desulfurizer.

Patent CN102772986A uses absorbent slurry containing limestone, active coke, catalyst and water to absorb and remove NOx and SO in flue gas 2 , not only consumes a large amount of water, but also has the problem of secondary pollution of solid and liquid waste

Patent CN204093254U relates to a new type of device that integrates medium and low temperature flue gas desulfurization, dust removal, denitrification and denitrification catalyst thermal analysis, but the device still uses ammonia water to remove NOx in flue gas. CN201239608 discloses the use of a semi-dry method for simultaneous desulfurization and denitrification integration system, but the system still does not solve the problems of water consumption and solid waste generation

[0003] my country's lignite reserves are relatively rich, but generally have high moisture content and low calorific value, resulting in high long-distance transportation costs, and are generally only suitable for nearby utilization; as gasification and boiler combustion raw materials, the adaptability is poor

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