共查询到18条相似文献,搜索用时 78 毫秒
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前言煤制气工艺中高温将煤中的复杂物质裂解成各种组分,随着气体带出的有氨、各种形态的硫化合物、苯类化合物、焦油……,其中不乏组成复杂的有机化合物。杂质中有些易造成管道堵塞,如萘及其衍生 相似文献
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介绍了一种地铁车站弱电设备间设备发热量确定新方法,该方法利用弱电设备发热量实测数据与模型预测数据相互验证,可以有效提高弱电设备发热量确定结果的准确性。研究了室内气温、地铁是否运营、设备额定功率和车站类型等因素对设备发热量的影响。研究结果表明:基于间接测量和预测模型的地铁车站弱电设备间设备发热量确定方法可以提高和保障设备发热量计算结果的准确性;室内气温会显著影响设备外表面和围护结构内表面温度及围护结构内表面热流密度,但对设备外表面热流密度的影响较小;地铁是否运营对弱电设备间设备发热量有较大影响,地铁运营期间设备发热量大于非运营期间;设备额定功率对弱电设备间设备发热量峰值有较大影响,车站类型和建筑面积对设备发热量峰值的影响很小。 相似文献
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《Planning》2013,(2):181-183
在管输压力下精确测定烃类组分发热量的一种方法及其样机已经开发成功,此设备的价格可允许目前采用间歇式取样的用户实现发热量的在线测定,在每分钟内多次测量、报告和记录体积基发热量。由于吸光池是在接近管道压力的条件下操作,因而管道中天然气的能量流量可以由单位体积基发热量与体积流率的乘积直接输出。利用分光光度计和标准硅CCD检测器在波长约900nm处进行测量,通过其吸收光谱测定天然气组成和发热量。与波长较长的红外吸收光谱相比,此区域内天然气各烃类组分的吸收光谱的线性关系更好。故对C1~C6组分和水分而言,谱图可以更精确地拟合为各组分(以单位体积中分子数量表示的)浓度。然后,将各组分的浓度加和即可得到天然气的体积基发热量。此外,诸如压缩因子、密度和相对密度等参数也可以由测定的体积组成求得。 相似文献
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发热量对煤炭利用日趋重要,文章根据影响煤炭发热量的因素,在不同输入因素条件下,应用支持向量机构建不同预测模型;比较不同模型的预测结果,得出最佳模型及输入因素,确定的支持向量机模型与神经网络模型对比,得出支持向量机预测发热量是可行的,期预测效果好于神经网络. 相似文献
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S. Ramasubramanian 《国际自然能源杂志》2020,41(6):621-626
ABSTRACTThe producer gas from biomass gasification is an upcoming power-generating technique for meeting the power requirements of the rural society. The performance of the biomass gasifier can be raised by mitigating tar in producer gas. Tar is highly carcinogenic and tends to condense at room temperature, which results in blocking and fouling of the downstream equipment. In this research, nano-structured SiO2-supported Ni pellets are used as catalysts to reduce the tar content in producer gas from a biomass gasifier. Further, Cerium (Ce) and Praseodymium (Pr) are reinforced with Ni–SiO2 pellets to improve the catalytic activity for tar mitigation. The Taguchi methodology is employed to rank and predict the optimal catalytic factor among the catalyst weight, gas feed rate (GF) and bed temperature (BT) for the tar cracking. The experimentation is done according to the L9 design table and the mathematical model for tar concentration is developed with the adequacy (R2) of 99.93%. The optimal catalytic system with 9?g of Pr, 0.01?l/s GF and 775°C of BT has reduced the tar concentration from 27 to 0.17?mg/Nm3, i.e. the efficiency of tar mitigation achieved is around 99.3%. 相似文献
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测试分析了木焦油基再生沥青结合料及基质沥青混合料、木焦油基再生沥青混合料、RA-102再生沥青混合料的性能。结果表明:木焦油基再生剂可将老化沥青的针入度、软化点、延度和黏度恢复至符合JTG F40-2017《公路沥青路面施工技术规范》技术要求;木焦油可使老化沥青充分软化,提升老化沥青的延展性和塑性;与RA-102再生沥青混合料相比,木焦油基再生沥青混合料具有良好的高温稳定性、低温抗裂性、水稳定性和抗老化性能;木焦油与生物质纤维协同作用可显著提高再生沥青混合料的强度和韧性,在改善沥青路面使用性能的同时延长其使用寿命。 相似文献
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Biomass gasification is an option for achieving the objective which could utilise both solid and low-density biomass in an efficient way. Experimental investigations are carried out to utilise three different types of feed stock, namely babul wood, neem wood and mango wood, to arrive at satisfactory performance. The efficacy of a 35kVA rated down draught gasifier was studied in terms of gasifier efficiency, tar content and total particulate matter. The optimum value of equivalence ratio was found to be 0.3134 for maximum gas conversion efficiency. Electrical output readings were observed to be 23.4, 22.17 and 20.4kVA for babul wood, neem wood and mango wood, respectively, with satisfactory performance. With the designed gasifier, significant improvement was achieved with babul wood as compared with other two fuels to generate the electricity. 相似文献
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D.G. Shaw 《The Science of the total environment》1977,8(1):13-20
Seventy-one tows of 740 m2 each were made in search of pelagic tar and plastics in the Gulf of Alaska and Bering Sea during the period October 1974 to October 1975. Tar was observed on nine occasions while plastics were found six times. The arithmetic mean value of tar abundance, 3.3 × 10?3 mg/m2, is considerably lower than most other oceanic areas for which values have been reported. Gas chromatographic analysis of this tar indicates that it is more extensively weathered than tar from the north Atlantic. An estimate of the abundance of tar lumps too small to be sampled by net tows is made based on the assumption that there are equal weights of particles in logarithmetically equal size intervals. The abundance of pelagic plastics is also low. 相似文献