Blast furnace injection pulverized coal desulfurization and denitrification combustion aid and its preparation method and use method

Abstract

The invention provides a desulfurization and denitration combustion improver in blast furnace coal injecting as well as a preparation method and a using method thereof. The desulfurization and denitration combustion improver is prepared from the following raw materials in percentage by weight: 18 to 23 percent of manganese dioxide, 5 to 8 percent of ferric oxide, 9 to 13 percent of barium carbonate, 10 to 16 percent of calcium oxide, 5 to 8 percent of sodium carbonate, 10 to 16 percent of rare earth oxide, 2 to 6 percent of titanium dioxide, 3 to 6 percent of potassium nitrate and the balanceof activated carbon; the rare earth oxide is prepared from the following raw materials in percentage by weight: 40 to 55 percent of yttrium oxide, 25 to 35 percent of lanthanum oxide and 20 to 30 percent of indium oxide; the average particle diameter of the rare earth oxide is 10 to 40 mum. The desulfurization and denitration combustion improver provided by the invention has a remarkable combustion-supporting effect on pulverized coal, the combustion efficiency of the pulverized coal can be effectively improved, emission of NOx and SOx can be effectively reduced, and the purposes of energy conservation and emission reduction can be achieved.

Description

technical field [0001] The invention relates to the technical field of combustion accelerants, in particular to a blast furnace injection pulverized coal desulfurization and denitrification combustion accelerant and its preparation method and use method. Background technique [0002] Due to the characteristics of my country's energy structure of "rich in coal, poor in oil, and low in gas", it is difficult for my country to change the energy consumption structure dominated by coal for a long period of time. At present, the traditional coal combustion method cannot realize the efficient utilization of coal, resulting in a great waste of resources. At the same time, due to the existence of elements such as N and S in coal, a large amount of SO will be produced during combustion. x , NO x Pollutant gases such as heavy metals and polycyclic aromatic hydrocarbons have an impact on the environment. [0003] The combustion process of coal is complex, generally divided into three s...

AI Technical Summary

Problems solved by technology

Under the current raw materials and process conditions, when the injection coal ratio of the ironmaking blast furnace exceeds a certain threshold, the combustion rate of pulverized coal injected into the blast furnace will decrease, thereby reducing the coal coke replacement ratio, increasing the coke load, and affecting The normal and stable operation of the blast furnace brings inconvenience to the operation of the blast furnace