Experimental Study On Increasing Coal Ratio In West China To Prepare Coke

In this paper,the petrographic technology of coal is used to study the micro-structure of coal,and the petrographic analysis technology of coal is used to automatically simulate coal blending.In the petrographic analysis of coal,the vitrinite reflectance of coal is the primary index to judge the degree of coal coalification of coking coal.The average maximum vitrinite reflectance and vitrinite reflectance distribution map are used to analyze the vitrinite reflectance.The reflectance distribution map of vitrinite is composed of a certain number of reflectivity data of a single measuring point.The reflectance distribution map of a single coal species usually shows a single peak and a normal distribution.The reflectance distribution map of mixed coal usually shows multiple peaks.According to the above characteristics of the vitrinite reflectance distribution map of coal,it is possible to distinguish whether coal is composed of a single coal species or not.The vitrinite reflectance distribution map can also guide coal blending production and optimize coal blending scheme.In this paper,according to the actual production of coal blending scheme,the ratio of Muli and other western coal is raised to about 80%.Through the petrographic analysis technology of coal to simulate coal blending,according to the vitrinite reflectance distribution map and parameters,some reasonable schemes are screened out,and then 20 kg coke oven blending coking test is carried out on these schemes to study the cohesiveness and coking properties of the new blended coal.According to the test situation of 20 kg experimental coke oven,industrial test is carried out.The main content is to study the comprehensive performance of coke by dry quenching,including industrial analysis,cold strength,hot strength,coke pore and optical structure.The research results show that the four selected industrial coal blending schemes are compared and evaluated: the coke quality of scheme 1(76% of coal blending in the west)is the worst,the coke production cost of scheme 2(81% of coal blending in the west)is the lowest,the coke ash and sulfur content of scheme 3(80% of coal blending in the west)is the lowest,and the coke strength of scheme 4(75% of coal blending in the west)is the best.Considering various influencing factors,four coal blending schemes are synthetically evaluated and concluded that the fourth scheme is the best coal blending scheme.Expected results have been achieved in industrial tests,and the aim of reducing ash and sulfur has been achieved.Especially,the ash content of coke decreases significantly,the quality of coke is improved,and the strength of coke is improved.In addition,the quality difference between coke from industrial test and coke from daily production was also studied.On the premise of stable coke strength,the ash and sulfur content of coke were reduced,and the coking cost was reduced.Good results have been achieved in ash and sulfur reduction and cost reduction,with remarkable economic benefits.The annual cost reduction is about 2544 million yuan,which is settled according to the internal price.It fully shows that increasing the application of coal blending ratio in Western China can effectively reduce the production cost of coke and contribute to the reduction of production cost in Baotou Iron and Steel Co.