提高补偿中子测井纵向分辨率的处理技术

中子测井是提供地层孔隙度和岩性信息的重要手段。在研究薄互层时,为了获得正确的储层参数,必须采用一些新的处理技术。J.E.Galford(1986年)以及 M.P.Smith(1990年)分别提出了两种提高中子测井纵向分辨率的处理方法,即 Alpha 方法和 DFSN 方法。本文针对这两种方法给出具体的算法,并结合我们具体的地质条件,对这些算法的效果作了分析和比较。     

Thermo-mechanical test rig for experimental evaluation of thermal conductivity of ceramic pebble beds

The experimental determination of mechanical and thermal properties of ceramic pebble beds, such as the lithium orthosilicate or lithium metatitanate, is a key issue in the framework of fusion power technology, for the reason that they are possible candidates in the design of breeder blankets.The paper deals with an experimental method for the evaluation of the thermal conductivity of ceramic pebble beds versus the temperature and compressive strain, based on a steady state heat flux through a material (alumina) of known conductivity. The alumina thermal conductivity is determined by means of the hot wire method. To assess the experimental method, a thermo-mechanical characterization of alumina pebble beds (a material largely available), having different diameters, considering a wide range of temperatures and compression forces has been carried out.Moreover preliminary tests have been performed on lithium orthosilicate and lithium metatitanate pebble beds.     

铝圆筒持久强度试验

鉴于用户对铝圆筒持久性能测定的高可靠性要求,却因无法制取满足国标要求的持久强度试验的试样而无法对其进行测试,因此专门设计并制造了一套铝圆筒持久强度试验台(专利号01101063.O),对成品铝圆筒进行持久强度测试.结果表明:外推得到95%置信度下铝圆筒在40℃服役10 a(年)的持久强度σ1040=(399±18)MPa.铝圆筒的持久性能可以满足用户要求.     

浅析峰峰矿区矿井突水原因及防治

峰峰矿区是华北大水矿区 ,水害严重威胁着下组煤层的开采。本文通过对该矿区典型突水事例的分析 ,探讨了造成突水的原因 ,并提出了防治的措施。     

空气重介流化床干法选煤机的测量和控制方法探讨

从空气重介流化床干法选煤机的工作原理入手 ,阐述了流化床床高和密度的均匀、稳定对分选的重要作用 ,分析了流化床分选过程中的动态平衡机理 ,针对其工艺特点提出了保证流化床床高、密度均匀及稳定的测控方法     

三软煤层中选取采煤机主参数注意的问题

介绍三软煤层的特点及采煤机在三软煤层中的使用工况 ,提出了采煤机在三软煤层配套及使用中的注意事项 ,为三软煤层综采配套采煤机的选型提供了理论分析和参考意见。     

Nitrogen oxides emission from a circulating fluidized bed combustor

Experiments were carried out in a pilot-scale circulating fluidized bed (CFB) coal combustor to investigate the mechanism of N₂O formation, nitrogen oxides (including NO_x and N₂O) emission and the effect of temperature, excess air ratio, recirculation ratio, etc. The concentrations of nitrous oxide and nitric oxide were measured along the height of the CFB furnace. N₂O concentration increased with height, and in the exit of the combustor N₂O reached the highest level. NO_x, however, decreased with height, showing the inverse trend compared with N₂O. The N₂O emission decreased sharply with the rise of temperature at the bottom of the combustor; at the same time, the NO_x concentration increased.     

Calcium sulphide formation in fluidized bed boilers

Analyses of samples of bed ash from a stationary fluidized bed boiler show the presence of calcium sulphide. In some samples, half of the total sulphur was present as sulphide. The samples containing CaS were obtained under unstaged conditions and with a high excess air ratio, 1.3 to 1.4. The samples were taken after a stop in the limestone addition, i.e. at high SO₂ emissions of about 1000 mL/m³ (ppm). No CaS was found during limestone addition when the SO₂ emission was 300–400 mL/m³. This indicates that formation of large amounts of CaS may be initiated as the SO₂ concentration exceeds some critical level.