成庄矿3~#和15~#煤矸石氧化特性及堆放参数研究
发布时间：2018-09-14 14:19
【摘要】：我国煤炭生产和消费量占一次能源生产和消费总量的70%左右,并且煤炭绝对消费量仍在逐年增加。煤矸石的堆存量与年排放量约占我国工矿业固体废弃物的四分之一,大量堆积的煤矸石占用土地、污染环境、破坏生态,甚至有可能发生自燃的危险,对矸石山堆积地造成了不可恢复的后果。因此采取合理的措施最大限度减少煤矸石堆对周围环境的破坏与污染,对煤炭工业可持续健康发展具有十分重要的意义。成庄煤矿产出的3#和15#两层煤矸石存在混堆现象,占用大量土地,破坏环境,造成矸石山自燃灾害的发生。本文针对3#和15#煤矸石的混堆现象,利用煤矸石程序升温实验与煤矸石热重差热实验,分别考察煤矸石各个氧化过程氧化产物的生成与自身随温度的变化规律,结合现场不同煤层煤矸石的堆放实验,获得煤矸石氧化自燃变化规律,从而初步给出合理的堆放参数以及煤矸石自燃检测临界温度值及气体指标,通过数值模拟软件的模拟结果,确定最优堆放参数。(1)从30℃到230℃的过程中,矸石产生的H2浓度出现了先增后减得一个阶段,氢气作为煤矸石自燃过程的一种指标性气体较难把握,应采取以CO气体为主,H2气体为辅的联合预测预报体系。(2)对不同种类的煤矸石而言,其自燃的临界温度也不尽相同。通过综合分析程序升温和热重实验的实验数据,认为15#煤矸石的自燃特性强于3#煤矸石自燃特性,15#煤矸石自燃临界温度较低。(3)现场实地将煤矸石积成设计的高为3m的4个圆台(锥)体和1个阶梯状,通过监测矸石堆的温度和气相产物,同时兼顾煤矸石堆放效果和矿上经济效益,确定以梯田形堆放为基础,每层煤矸石堆放以矸石层(压实)和粘土(黄土)层以比例为10:1进行分层堆积,有利于防止煤矸石堆的氧化自燃,堆积方式较为合理。(4)应用ABAQUS有限元数值模拟软件通过设定不同模拟参数,对不同矸土比堆积的矸石堆进行数值模拟,研究确定煤矸石采取矸土比为15:1堆放方式可以节省大量物力和财力,缩短堆放工程时间,因此,煤矸石采取矸土比为15:1的梯形堆放方式,单层矸石厚度5m为基准,堆积角度为35°,进行分层堆积更为合理。
[Abstract]:China's coal production and consumption account for about 70% of the total primary energy production and consumption, and the absolute coal consumption is still increasing year by year. The amount and annual discharge of coal gangue is about 1/4 of the solid waste of industrial and mining industry in China. A large amount of coal gangue occupies the land, pollutes the environment, destroys the ecology, and may even occur the danger of spontaneous combustion. On the gangue mountain accumulation caused irreparable consequences. Therefore, it is of great significance for the sustainable and healthy development of coal industry to take reasonable measures to minimize the damage and pollution of coal gangue heap to the surrounding environment. The coal gangue produced in Chengzhuang coal mine has mixed pile phenomenon, which occupies a lot of land, destroys the environment and results in the spontaneous combustion disaster of gangue mountain. In this paper, according to the mixing phenomenon of coal gangue and coal gangue, the formation of oxidation products of coal gangue and its own variation law with temperature are investigated by using coal gangue programmed heating test and coal gangue thermogravimetric differential thermal experiment. Combined with the stacking experiment of coal gangue in different coal seams, the variation law of coal gangue oxidation spontaneous combustion was obtained, and the reasonable stacking parameters, critical temperature value and gas index of coal gangue spontaneous combustion detection were preliminarily given. Through the simulation results of numerical simulation software, the optimal stacking parameters are determined. (1) during the process from 30 鈩，
本文编号：2242954
[Abstract]:China's coal production and consumption account for about 70% of the total primary energy production and consumption, and the absolute coal consumption is still increasing year by year. The amount and annual discharge of coal gangue is about 1/4 of the solid waste of industrial and mining industry in China. A large amount of coal gangue occupies the land, pollutes the environment, destroys the ecology, and may even occur the danger of spontaneous combustion. On the gangue mountain accumulation caused irreparable consequences. Therefore, it is of great significance for the sustainable and healthy development of coal industry to take reasonable measures to minimize the damage and pollution of coal gangue heap to the surrounding environment. The coal gangue produced in Chengzhuang coal mine has mixed pile phenomenon, which occupies a lot of land, destroys the environment and results in the spontaneous combustion disaster of gangue mountain. In this paper, according to the mixing phenomenon of coal gangue and coal gangue, the formation of oxidation products of coal gangue and its own variation law with temperature are investigated by using coal gangue programmed heating test and coal gangue thermogravimetric differential thermal experiment. Combined with the stacking experiment of coal gangue in different coal seams, the variation law of coal gangue oxidation spontaneous combustion was obtained, and the reasonable stacking parameters, critical temperature value and gas index of coal gangue spontaneous combustion detection were preliminarily given. Through the simulation results of numerical simulation software, the optimal stacking parameters are determined. (1) during the process from 30 鈩，
本文编号：2242954
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