Fenyi Power Plant, SPIC Jiangxi Electric Power Corporation Ltd.
Hunan Sundy Science and Technology Corporation Ltd.

量热仪的热容量稳定性是准确获得煤炭可靠热值的基本前提,而氧弹是量热仪中供样品燃烧用的核心容器,其热传导性对量热仪的测量精准度有着较大的影响,因而研究量热仪中氧弹的热传导不确定性则可为提升量热仪的热容量稳定性及其测量精度提供支撑依据。针对量热仪中的氧弹部件,结合量热仪的工作原理及试验室环境要求,从氧弹的材质与弹筒壁厚及容积、氧弹芯内部组件的合理设计、氧弹整体清洁度3个角度分析影响氧弹热传导性的影响因素,并对2款不同型号的氧弹进行热传导性比对,以期有助于提高量热仪测试数据的稳定性。经燃烧试验发现,氧弹的热传导存在不确定性时会使仪器热容量不稳定,从氧弹整体清洁度进行试验分析则得出氧弹内、外表面油膜会导致热容量测试数据存在离散度变大的结论,由此提出减少氧弹热传导不确定性的措施,主要包括选择合适的氧弹材质、弹筒壁厚、氧弹容积,如氧弹材质宜选择镍铬或镍铬钼合金钢,氧弹容积一般为250~350mL,弹筒壁厚宜为5~6mm;优化氧弹芯结构中的陶瓷套、绝缘套等导热性能差的组件,氧弹结构尽可能简单且避免热传导路径过长;彻底清洁氧弹筒、氧弹盖、氧弹芯的内外表面,以清除油脂等异物对实验测定结果的干扰。

The stability of the heat capacity of the calorimeter is the basic premise to accurately obtain the relia⁃ble calorific value of coal, and the oxygen bomb is the core container for the combustion of samples in the calorime⁃ter, and its thermal conductivity has a great influence on the accuracy of measurement of the calorimeter, so thestudy of the thermal conduction uncertainty of the oxygen bomb in the calorimeter can provide a supporting basis forimproving the heat capacity stability and accuracy of measurement of the calorimeter. Regarding to the oxygen bombin the calorimeter, combined with the working principle of the calorimeter and the environmental requirements of thelaboratory, the influencing factors of the thermal conductivity of the oxygen bomb were analyzed from three perspec⁃tives: the material, wall thickness and volume of the oxygen bomb, the design of the internal components of oxygenbomb core, and cleanliness of oxygen bomb. The thermal conductivity of two different types of oxygen bombswere compared, in order to help improve the stability of the calorimeter test data. The combustion test found thatwhen the thermal conduction of the oxygen bomb has uncertainty, the heat capacity of the calorimeter will be unsta⁃ble. From the oxygen bomb surface cleanliness test, it is concluded that the oil film on the surface will cause alarge dispersion of the heat capacity test data. Therefore, the measures to reduce the uncertainty of the oxygenbomb thermal conduction are proposed, mainly including the selection of the appropriate material, wall thickness andvolume of the oxygen bomb. For example, nickel⁃chromium or nickel⁃chromium⁃molybdenum alloy steel is the prop⁃er material for oxygen bomb, the volume of the oxygen bomb is generally 250-350 mL, and the wall thickness of theoxygen bomb should be 5-6mm; the optimization of ceramic sleeve and insulation sleeve and other components withpoor thermal conductivity in the oxygen bomb is needed, as simple as possible oxygen bomb structure is needed, toolong thermal conduction paths is need to be avoided; and thoroughly clean of inner and outer surfaces of the oxygenbomb barrel is needed, as well as oxygen bomb cover and oxygen bomb core to avoid the interference from for⁃eign matter such as oil film on the experimental measurement results.

分宜电厂智慧燃料智能化验系统的研究与应用科技基金资助项目(JXGS-2022-17-13)

卫健, 黄超, 邹 乐 春, 等. 量 热 仪 中 的 氧 弹 热 传 导 不 确 定 性 影 响 因 素 研 究 [ J]. 煤 质 技 术, 2023,38 (4): 91-97.

WEI Jian, HUANG Chao, ZOU Lechun, et al. Study on influencing factors of uncertainty of oxygen bomb ther⁃mal conduction in calorimeter [J]. Coal Quality Technology, 2023, 38 (4): 91-97.