“引避疏堵排五位一体”综合防治水技术研究

新桥煤矿通过采用现场“引”、“避”、“堵”、 “疏” 与“排”的试验、理论分析等综合研究方法,选择典型的南一采区2105工作面进行重点评价,在分析和查明矿井二₂煤层开采条件下底板太灰高承压含水层充水因素、地下水径流特征、底板阻控条件的基础上,对底板含水层控水和突水危险程度进行评价,建立评价预测模型,研究太灰高承压水地下水径流运移规律,并最终提出太灰水“引、避、疏、堵、排五位一体”的综合防治技术对策。研究为今后的防治水工程指明方向。     

云泉煤业各水源类型的水化学特征分析研究

云泉煤业的主要水害类型为采空区水、顶板裂隙水,其次为地表水,奥灰水。为更快速高效地辨别出水水源,特针对性的采集了不同水源的水样,采用KSF-W300型矿井水源快速识别系统进行水样的甄别,遴选出具有代表性的水源水样,综合描述性统计、相关性分析、运用 Piper 三线图进而对不同水源的水化学特征及其形成机理进行了分析和探讨。结果表明:该矿地下水化学特征的形成主要受到岩石风化溶解作用的影响,同时伴随着一定的吸附交换作用及脱碳酸作用。其4种水源的水化学类型各不相同,地表水水化学类型为HCO₃-Ca,裂隙水的化学类型为HCO₃-Na,老空水的化学类型为HCO₃（SO₄）-CaMg,奥灰水的化学类型为SO₄HCO₃-CaMg。同时,总结出了4种水源类型的特征离子,并给出了特征离子的量化指标,便于后续日常探水及突水时更加快速高效地辨别出水水源,使得防治水作业更具靶向性。     

中国高炉喷煤史回顾

通过对我国高炉的第一套喷煤装置、第一次富氧喷吹、第一次浓相输送、第一次煤比20kg/t的突破等诸多项"第一"史实的介绍,简要回顾了中国高炉喷吹煤粉的历史.     

软分层厚度对煤体爆破致裂效果的数值模拟

根据煤体爆破致裂理论,结合工程实际,建立ANSYS/LS-DYNA有限元模型,研究了软分层厚度变化对含软分层煤体的致裂规律。结果表明:软分层改变了煤体内部裂纹扩展的方式和规律,导致上部硬煤层裂隙增多,下部硬煤层裂纹数量、扩展长度及分布集中度降低;软分层厚度变化只影响下部硬煤层的裂隙分布、裂隙集中度及裂隙贯通面积,对上部硬煤层几乎没有影响;拟合出了软分层厚度与峰值压力之间的关系曲线,结合致裂理论,可以估算出含软分层煤体致裂区域,为评估含软分层煤体致裂效果及有效治理瓦斯提供参考。     

Fuel analyses and rank determination of the Egyptian Maghara main coal seam,north central Sinai,Egypt

Three geologic sections along the main coal seam (MCS) of the Middle Jurassic (Bathonian) Safa Formation of Maghara mine are examined. Samples collected have been studied. The fuel analyses of coal samples were conducted to determine their Rank characteristic. Fuel analysis classified the studied Maghara MCS as high grade coal, medium rank (D) of para-bituminous class based on its average values of ash content 7.1% (dry-base; d.b), gross calorific value (29 Mj/kg; moist ash free) and random vitrinite reflectance 0.43%. Synonym nomenclature of the studied Maghara coal based to ASTM classification is high volatile (C) class of bituminous group with agglomerating character attributed to their values of gross calorific value 30 Mj/kg-(moist-mineral-matter-free; mmmf), fixed carbon 45% (dry-mineral-matter-free; dmmf) and volatile matter 54.8% dmmf. Elemental ratio of H/C versus O/C indicate that majority of the studied Maghara coal samples occupy the area of vitrinite genesis pathway on Van-Krevelen diagram, and within the area of per-hydrous in Seyler chart of dominated anoxic condition. Studied coal seam is a type III kerogen corresponding to humic characteristic, within the immature and mature zones of coalification.     

A model for the devolatilization of a coal particle sufficiently large to be controlled by heat transfer

This study follows previous experimental work showing that the shrinking-core model applies to the pyrolysis (i.e., heating in the absence of oxygen) of particles (diam. ≈ 14 mm) of a bituminous coal or a lignite in a fluidized bed at 700-950 °C. These experimental facts are in accord with the production of volatile matter being endothermic and not thermoneutral, as often assumed. Also, the rate at which volatile matter is produced in the presence of oxygen (i.e., devolatilization) or in its absence (pyrolysis) is demonstrated here to be controlled not at all by mass transfer, but by heat conduction to a moving reaction front inside a coal particle, provided its diameter exceeds ∼3 mm. The resulting steady-state model of devolatilization indicates that six dimensionless groups are required to describe the rate of

(I)     

清洁煤发电的CCS和IGCC联产技术

煤气化联合循环（IGCC）发电技术是煤气化和燃气——蒸汽联合循环的结合,是当今国际新兴的一种先进的清洁煤发电技术,其具有高效、低污染、节水、综合利用好等优点。碳捕捉及封存技术（CCS）和整体煤气化联合循环技术（IGCC）被认为是最有潜力的技术。文中简要介绍了整体煤气化联合循环（IGCC）系统、构成及发展现状,总结了二氧化碳的收集方式和封存方法。指出了成本问题是困扰CCS和IGCC的联产应用的主要障碍,并提出了几点发展措施。     

CFB锅炉空冷机组发电煤耗的影响因素及改进方法

利用热能计算公式,从机组汽温、汽压、真空及各项指标参数及运行方式等方面分析国产首台690t/h循环流化床锅炉机组在投运以来影响煤耗的因素,神华亿利电厂采用此项分析后在机组大修时做出有针对性的安排,机组煤耗大大降低;为北方高寒地区利用空冷技术的流化床机组经济运行提供借鉴方法。     

Coal gasification with in situ CO2 capture by the synthetic CaO sorbent in a 1 kWth dual fluidised-bed reactor

Coal gasification with in situ CO₂ capture is believed to be able to produce highly concentrated H₂ with little or no CO₂ compared with the conventional process. This has been demonstrated by other researchers working on a single fluidised bed by continuously feeding the CaO sorbent. This work presents the results of coal gasification with in situ CO₂ capture by a synthetic CaO sorbent in a 1 kW_th dual fluidised-bed reactor at atmospheric pressure, which has not been reported in the literature. The synthetic CaO sorbent is cyclically used by going through multiple carbonation/calcination cycles during coal gasification.