Method for matching mixed coal with relatively high heating value

Abstract

The invention discloses a matching method of mixed coal with a relatively high heating value. The method comprises the following steps: 1) selecting bituminous coal and anthracite as components of the mixed coal; 2) designing a 6-17 coal blending scheme according to all-anthracite injection and all-series coal blending thoughts of all-anthracite injection, designing a coal injection framework according to anthracite proportion decreasing by m% and bituminous coal increasing by m%, and determining the matching ratio of mixed coal, m being 6.25-20; and 3) selecting the scheme with the highest intersection degree of the combustion rate and the exothermic value index as the scheme of the invention. The anthracite and the bituminous coal are mixed and injected according to a certain proportion, and meanwhile, the dry basis volatile component and the ash content of the mixed coal are well controlled, so that combustion can be mutually promoted, the actual coke replacement ratio of a blast furnace is increased, the explosiveness of the mixed coal powder is greatly reduced, the combustion performance is relatively improved, the generation amount of unburned coal powder is reduced, and the production cost is reduced. And smooth operation of the blast furnace is facilitated.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a method for mixing mixed coal with relatively high calorific value. Background technique [0002] Under the current technical conditions, it is impossible to burn all the pulverized coal before the tuyere, and the remaining part will enter the furnace in the form of unburned coal, and then be consumed by participating in various reactions. However, if the amount of unburned coal powder is too much, the gas channel will be blocked, the pressure difference will increase, and the blast furnace will be affected until it causes suspension. The unburned pulverized coal that has not been utilized then escapes from the furnace roof with the gas and loses the effect of coal injection. Maximize the combustion rate of pulverized coal in the tuyere area and the replacement ratio of coal injection, reduce the coke ratio and fuel ratio, reduce the energy consumption of the bla...

AI Technical Summary

Problems solved by technology

[0009] Although the above literatures have explained how to improve the combustion rate and / or calorific value of pulverized coal from different aspects, they have not studied the mixing and matching of pulverized coal to find a method of mixing coal that takes into account both combustion rate and calorific value.

Images