捣固煤饼塌煤的原因分析及解决措施

从配煤、捣固、装煤、维护环节对煤饼塌煤的原因进行分析,根据焦炉现场情况对装煤过程优化和完善,提高了煤饼的成型率,有效防止捣固煤饼塌煤。     

煤调湿在捣固炼焦中的应用

随着捣固炼焦大型化的推进,煤饼的成型率越来越受到人们的关注,而煤饼成型率的好坏很大程度决定于入炉煤的水分控制。利用烟道气的热量及适当的外加热源进行煤调湿,可以提高煤饼成型率,增加焦炭产量,有效地降低回炉煤气量、减小污水及CO2的排放量。     

单种煤可捣固性能的研究

通过对6种不同煤化度煤的可捣固性能的研究发现,不同煤化度煤种的可捣固性能差别很大,中等煤化度的烟煤可捣固性能较好.同时以气煤和肥煤为研究对象,考察成型压强、水分含量及粒度组成对煤饼性能的影响后发现,最适宜成型压强在30MPa左右,各煤种都存在属于自己的最佳水分区间,粒度组成对煤饼性能的影响也十分显著.     

大型捣固焦炉煤饼输送稳定性研究

介绍了大型捣固焦炉煤饼输送机构的结构并分析了煤饼塌饼的原因。从配煤要求、捣固机选用、捣固煤箱刚度要求、煤饼高宽比等方面提出了保证煤饼输送稳定性的措施。     

事故煤处理系统在大型捣固焦炉中的应用

捣固炼焦是将配合好的炼焦煤输送到捣固装煤机的煤箱内,用捣固机将煤料捣固成煤饼,捣固装煤机从机侧炉门把煤饼送入炭化室,煤饼在炭化室内高温干馏成焦炭后,用推焦机推出。     

焦炉烟道气余热为热源的煤调湿技术应用

针对云煤能源公司下属焦化公司生产中因配煤水分高而造成的煤饼剥蚀量大、易坍塌、捣固成型困难等问题,进行了煤调湿工艺开发,以焦炉烟道气余热为热源或动力源,开发的"焦炉烟道废气-流化床"和"焦炉烟道废气-滚筒干燥机"煤调湿技术,可以控制配煤水分在10%左右,并且在节能、降耗、减排方面效益显著。     

捣固炼焦技术的研究与开发

介绍了捣固炼焦技术的基本原理,论述了天宏焦化公司在应用这一技术过程中,对原料煤的选择及配比、煤饼成型、炼焦工艺、环境保护、捣固设备、组合型集气管系统的压力调节、捣固炼焦系统微机自动化集中控制系统等方面进行了改进、研究与开发,收到了炼焦煤源拓宽、焦炭产量高且质量好、既保护环境、企业又有显著经济效益的多重效果,并大大促进了捣固炼焦技术的发展。     

关于捣固炼焦焦饼收缩度的探讨

分析了捣固炼焦与顶装炼焦的焦饼收缩度差异性及其影响因素,探讨了低挥发分配煤在捣固炼焦设计和生产等方面的问题,并提出了下列措施:适当降低加热水平;设定合理的结焦时间;设计可调煤饼宽度的装煤车;根据配合煤Vdaf和X值调整煤饼宽度、高度及采用XD值指导生产,以保证煤饼与炉墙有足够的间隙和适宜的空间温度。     

6.25m捣固焦炉分层捣固技术的应用

将传统的捣固方式设计为7层捣固,使煤饼的堆密度成塔形分布,并根据每层捣固功和下煤量的不同进行调试,使每层煤饼的堆密度和捣固功由下而上逐层递减,每层煤间成叠压交汇,使单炉捣固时间达到420s,提高操作效率20%,塌饼率从10%～20%降至0,入炉煤水分从14%降至12%,提高了煤饼的抗剪力强度,同时改善了焦饼的高向加热。     

捣固煤饼稳定性影响因素探讨

研究了捣固炼焦工艺中煤饼的稳定性与配合煤水分、粒度组成以及捣固频次等因素的关系。综合分析认为,煤饼的稳定性用抗压强度和抗剪强度指标反映更准确,当配合煤水分控制在9%～11%,频次在5左右,配合煤细度在90%左右时进行捣固炼焦生产较为适宜,此时捣固煤饼的稳定性较好。     

Statistical evaluation of hyperbaric filtration for fine coal dewatering

A statistical design of parametric study of pressure filtration for fine coal dewatering is presented. The effects of five major parameters of the dewatering, i.e. applied pressure, filtration time, cake thickness, solids concentration and slurry pH, on cake moisture reduction and air consumption were investigated. The study was conducted starting with two level factorial experiments to identify the most significant parameters, and concluding with response surface methodologies to establish an optimum operating condition for the dewatering of fine coal. It was observed that applied pressure, cake thickness and filtration time were identified to be the key operating variables for reduction of filter cake moisture as well as air consumption. With the key parameters, an optimum condition for the dewatering was determined to be an applied pressure of 93 psi with a cake thickness of 2.5 cm and a filtration time of 4.8 minutes for the laboratory filtration system. At these optimum conditions the filter cake containing about 22 percent moisture by weight and consuming air by 4.1 m³/(m²·min·kg) on dry solid basis was obtained.     

以颗粒煤为助滤剂对城市污泥进行二段过滤脱水的研究

以颗粒煤为助滤剂,采用二段过滤方式来强化城市污泥的脱水,并对滤饼进行热值分析,探讨城市污泥资源化利用前景.在研究中,具体分析探讨了煤的类型、煤的添加比、煤的粒径、搅拌强度、过滤压力以及煤的添加方式对过滤过程中相关参数的影响.得到以下结论:在污泥和煤的添加比为1:2,颗粒煤粒度为0.15～0.18 mm,低强度搅拌,常温...     

降低过滤机滤饼水分和细粒煤脱水浅析

根据对选煤厂细粒煤样的实验室优化脱水试验、工业试验及分析结果 ,对真空系统、气水分离器和分配头实施了技术改造 ,细粒煤脱水系统的运行状况得到显著改善 :圆盘真空过滤机滤饼水分降到 2 0 %左右 ,脱饼率在 95 %以上 ,每年的直接经济效益可达 30 0多万元     

大淑村选煤厂煤泥水系统的优化

分析了大淑村矿选煤厂煤泥水压滤系统存在的问题，并对压滤环节进行了深入的理论分析及试验研究，通过优化煤泥水处理关键设备的操作工艺，解决了大淑村矿选煤厂浮选精煤滤饼含水率偏高的问题。     

Improving the dewetability characteristics of hydrophobic fine particles by air bubble entrapments

The present study deals with the role of surface hydrophobicity and air bubble entrapment on filtration / dewatering of fine coal particles (− 0.5 mm). The experimental results showed that hydrophobizing reagents increased the contact angle (or hydrophobicity) and decreased the filtrate surface tension, cake formation time and moisture content of the fine particles. In addition to these, when the air bubbles were introduced to the hydrophobic fine coal particles in water, the cake formation time and moisture content of the filter cake were further reduced, which may be attributed to the fact that micro/nano size air bubbles were entrapped on the surface of the fine particles in a slurry and increased the dewetting characteristics of the fine particles. As a result, this process may lower the amount of moisture trapped during the dewatering fine particles and increase the efficiency of the filters.     

四台选煤厂降低末精煤水分的措施

针对四台选煤厂末精煤水分偏高问题,分析了末精煤产品组成和水分,发现粗煤泥和细煤泥水分较高是造成末精煤水分偏高的主要原因。通过将传统弧形筛改造为智能振动筛网式弧形筛,定期翻转弧形筛筛网,在筛面增设挡皮;将FC1200离心机筛篮孔径由0.375 mm增至0.500 mm,调整煤泥旋流器组运行参数;加大压滤机维护力度,根据压滤机入料浓度及时调整压滤机工艺参数;引进HVPF-120 m2立式压滤机;"以灰换水"增加筛分煤系统等措施,使末精煤水分由15.72%降至14.00%以内,减少产品运输系统中胶带机打滑现象,减轻员工劳动强度,外运精煤冻车皮现象得以杜绝,确保了选煤厂正常外运,仅运费一项就节约成本540万元。     

Application of Enhanced Vacuum Filtration to Dewatering of Fine Coal Refuse

Abstract

It is difficult to reduce the moisture content of fine coal refuse to a satisfactory level because of the high mineral content and the large capillary forces associated with small particle sizes. An experimental investigation of important operating variables on dewatering of fine coal refuse is reported. The cake permeability, cake formation time and final moisture content are used to measure the efficiency of moisture removal. Factors that were studied are the addition of coarse particles, level of vacuum, pH and the use of coagulants, flocculants and surfactants as additives. Addition of a flocculant was the most effective single means of improving dewatering and the permeability could be increased by more than an order of magnitude and the moisture content lowered by as much as 0.05 kg water/kg dry cake. It was found that the ionic nature and molecular weight of the flocculant, the flocculant dosage, the mixing time and the mixing intensity must be carefully studied to obtain optimal performance.     

煤调湿应用于煤处理工艺的探讨

介绍了煤调湿技术的发展过程,对比三代煤调湿技术的差异,讨论了增设煤调湿装置对煤处理工艺流程带来的变化,为设计选用提供了参考。对导热油煤调湿、蒸汽煤调湿和气力分级煤调湿的4种实施方案进行了分析比较,提出了工程应用中需注意的问题。