神华褐煤热压提质工艺参数优化的问题分析研究

发布时间：2018-03-01 10:49

  本文关键词： 褐煤 干燥 气爆 成型率 落下强度　出处：《辽宁科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着世界优质煤炭资源的逐渐减少,开采费用日益增高,世界各国开始或更加重视对储量丰富的褐煤资源的开发利用,但由于褐煤水分含量高,含氧量高,发热量低,易风化和自燃,不利于长途运输等原因,其应用范围受到一定的限制。只有通过对其进行提质加工,才能扩大褐煤用途,提高其经济价值。本论文以神华宝矿褐煤为研究对象,对其进行干燥脱水和热压成型,运用成型工艺参数、成型机抽气系统对成型气爆的影响和防止成型机的气爆的工艺着手探讨神华宝日希勒褐煤提质工业试验装置运行中存在的制约系统稳定运行的成型机气爆、提质煤成型率、型煤落下强度等重要问题。研究结论如下:成型辊间布料均匀性、提质煤温度,水分、给料粒度分布等是造成气爆的主要原因。通过运行总结当成型机加载压力相差大于30Bar时,气爆明显,提质煤温度控制在85~95℃、水分在8%~10%之间,成型机的气爆问题能够得到有效控制。提质煤的温度、水分、成型机加载压力等是影响提质煤成型率的主要原因。通过运行总结,提质煤温度控制在85~95℃、水分在8%~10%之间、加载压力在17Mpa时,提质煤成型最佳。型煤落下强度的影响因素有:提质煤温度、水分和粒径分布,成型机辊缝间隙和加载压力、成型机气爆问题等。
[Abstract]:With the decrease of high quality coal resources in the world and the increasing of mining cost, many countries in the world begin or pay more attention to the exploitation and utilization of lignite resources, which are rich in reserves. However, because of the high moisture content, high oxygen content and low calorific value of lignite, Weathering and spontaneous combustion are not good for long-distance transportation, and its application scope is limited. Only by improving the quality of lignite, can the use of lignite be expanded and its economic value be improved. In this paper, the lignite of Shenhua Mine is taken as the research object. Drying, dehydration and hot pressing were carried out, and the forming process parameters were used. The influence of the air extraction system of the moulding machine on the forming gas explosion and the process of preventing the gas explosion of the moulding machine are discussed in the operation of the Shenhua Baolishler lignite extraction industrial test unit, which restricts the stable operation of the system and the molding rate of the molding machine. The main reasons for the gas explosion are as follows: the distribution uniformity between the forming rollers, the temperature of the raised coal, the moisture content, the distribution of the grain size of the feedstock, etc. The main reasons for the gas explosion are summarized through the operation, when the load pressure difference of the molding machine is greater than 30Bar, The gas explosion is obvious, the temperature of the coal is controlled at 85 ~ 95 鈩，

本文编号：1551616