Preparation method of graded pore activated coke with needle-shaped mesoporous channel and application of graded pore activated coke in flue gas desulfurization

Abstract

The invention discloses a preparation method of a graded pore activated coke with a needle-shaped mesoporous channel and an application of the graded pore activated coke in flue gas desulfurization. According to the method, needle-shaped nanometer Mg(OH)2 is used as a template agent and thoroughly mixed with a pulverized coal, and after drying, calcination is carried out in the nitrogen and carbondioxide atmosphere and then natural cooling to room temperature is carried out, and then magnesium oxide is removed by using hydrochloric acid to obtain the graded pore activated coke. The method uses the pulverized coal as the raw material and the needle-shaped nanometer Mg(OH)2 as the template agent to obtain the needle-shaped flat mesoporous channel, the graded pore activated coke is applied to flue gas desulfurization technology, an adsorption rate and a sulfur capacity of the activated coke can be improved, and the number of recycling is increased.

Description

technical field [0001] The invention belongs to the technical field of activated carbon, and more specifically relates to a method for preparing a graded pore activated coke with needle-shaped mesopore channels and its application in flue gas desulfurization. Background technique [0002] Activated coke flue gas desulfurization technology has pollutant SO 2 It has the advantages of resource utilization, less consumption of water resources, no secondary pollution, and harmless recycling of absorbents, etc., and has broad development prospects. The basic principle is to utilize the well-developed micropores to absorb SO in the flue gas 2 , O 2 、H 2 O and other gases are adsorbed and catalytically converted into by-product H 2 SO 4 , and migrate and exist in the medium and large pores in the form of a high-concentration liquid phase. Therefore, the desulfurization activated coke with excellent performance should also have: developed microporous structure to strengthen SO ...

AI Technical Summary

Problems solved by technology

Researchers have adjusted the pore structure of activated coke by controlling the temperature and atmosphere conditions of carbonization and activation, adding catalysts, etc. Unable to meet the requirements of rapid movement of adsorbate, high cost of active coke preparation and other issues:

[0005] (1) By controlling the temperature conditions (heating rate and final temperature) of the carbonization process, only the content and aggregation degree of the microcrystalline carbon structure in the raw coal are affected, and the aggregation form of the microcrystalline carbon structure cannot be controlled, so the pores cannot be effectively controlled Structural form

[0006] (2) By controlling the temperature conditions of the activation process and the components and concentrations of the activated gases (water vapor, CO 2 and O 2 and other components), which can only regulate the volume and size distribution of micropores and mesopores, but have no effect on the pore structure and connectivity between micropores and mesopores.

However, this structure is prone to ink bottle-shaped holes, which is not conducive to the migration of gas molecules and by-products

[0008] (4) Active coke with mesoporous order can be prepared by the template method (hard template made of silicon-based molecular sieve, soft template made of ethyl silicate, etc.), which can promote the transport of gas molecules and by-products, but the price of the template agent is high , complex operation, low coke rate and other problems, it is difficult to achieve large-scale application

Images