共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
采用旋转黏度计并结合XRD分析系统研究了不同碱度条件下,TiN对连铸保护渣黏度的影响。结果表明TiN可以增加连铸保护渣的黏度。TiN加入量〈5%时,对连铸保护渣的黏度影响较小。随着CaO/SiO2的增大,添加10%TIN连铸保护渣的黏度先迅速减小而后有所增大。添加10%TIN,CaO/SiO2为0.3的连铸保护渣中仅存在TiN晶体。CaO/SiO2为1.5的连铸保护渣中出现钙钛矿(CaTiO3)、硅酸二钙(Ca2SiO4)、枪晶石(Ca4Si2O7F2)、霞石(NaAlSiO4)及TiN。 相似文献
4.
5.
张肖洒王宏源李振彪夏志美 《储能科学与技术》2022,(7):2066-2074
针对目前急需解决的废旧磷酸铁锂(LiFePO_(4))电池中有价金属的清洁高效提取问题,提出硫酸化焙烧脱氟-水浸新工艺。用TG-DSC和XRD表征确定了正负极片热处理的适宜条件为:空气气氛、温度575℃。采用正交实验和单因素实验研究了浓硫酸使用量、焙烧时间和温度。水浸液固比、温度及时间对正负极混合料粉末中Fe、P和Li元素浸出率和浸出液中F元素残存率的影响。确定了最优焙烧工艺条件为:浓硫酸使用量为理论用量的0.75倍、焙烧时间2.5 h、温度110℃;最优水浸工艺条件为:液固比4∶1(mL/g)、温度60℃、时间2 h。在此工艺条件下,P和Li的浸出率都达到100%,Fe元素的浸出率为98.85%,F元素在浸出液中的残存率仅为13.11%。 相似文献
6.
以城市污水厂污泥为原料,添加高岭土、黑黏土、铬渣混合造粒成球。通过配合比试验和烧成条件优化试验,研究原料配比和烧成条件对陶粒性能的影响,得出实验室制备陶粒的最佳原料配比为:高岭土:污泥:黑粘土:铬渣=52∶26∶15∶7,最佳烧成条件为:干燥温度120℃,干燥时间2h、预热温度500℃、预热时间30min、焙烧温度1255℃,焙烧时间20min。制得的陶粒性能符合GB/T 17431.1-1998 700级标准要求。 相似文献
7.
8.
《节能技术》2016,(4)
为研究生物质成型燃料的结渣特性,本文采用生物质成型燃料链条锅炉燃烧设备,选择5种生物质成型燃料,采用工业锅炉节能监测方法和结渣率测定方法,对炉膛温度、过量空气系数及炉渣成分和灰熔融特征温度等对结渣率的影响进行了试验研究。试验结果表明,炉膛温度越高,过量空气系数越高,结渣率就越高;对大多数生物质成型燃料来说,软化温度越低,结渣率越高;当软化温度超过1 368℃时,不会发生结渣,燃用生物质成型燃料的锅炉,炉膛的出口烟温应低于1 000℃,可以减少结渣。另外,结渣也与生物质灰渣中的Si元素、碱金属元素及碱土金属元素有关,碱土金属可以抑制结渣,而碱金属和Si元素可促使结渣,从而为设计适合生物质成型燃料燃烧设备及改善燃料的燃烧性能提供依据。 相似文献
9.
10.
以甘草渣为研究对象,9种氯化胆碱为氢键供体的低共熔溶剂(DES)作为溶剂,对甘草渣进行预处理,研究不同反应温度与反应时间对甘草渣理化特性的影响。醇类DES中,乙二醇/氯化胆碱的预处理效果最好,在150 ℃,1 h条件下最大木质素脱除率为38.33%。酸类DES中,乳酸/氯化胆碱在100 ℃,1 h处理条件下木质素脱除率最高为40.87%,纤维素保留率高达95.28%。碱类DES中,乙醇胺/氯化胆碱在4 h,150 ℃处理条件下木质素脱除率最大为73.02%。物理表征结果说明,DES可破坏纤维素分子内氢键,断开碳水化合物与木质素的酯键,使纤维素可及表面积增大,有利于后续利用。 相似文献
11.
12.
从应用实例出发,对溴化锂吸收式制冷机组运行时可能发生的溶液结晶现象,以及溴化锂水溶液的结晶机理进行分析,并提出溴化锂水溶液的结晶的应用对策,部分机组运行验证的结果表明这种策略可行. 相似文献
13.
14.
Brian Worth 《Nanoscale and Microscale Thermophysical Engineering》2013,17(4):317-333
Intense centrifugal fields can be exploited to increase the electrochemical reaction rates in energy conversion devices, such as batteries and fuel cells, to improve their overall performance characteristics. This paper describes how “spin-enhanced natural circulation,” created under high centrifugal acceleration, can be used as a means for promoting an increase in mass transfer and reaction rates in three-dimensional porous electrodes. Some relevant scaling laws and new theoretical insights will be discussed to identify the main governing parameters in the design of centrifugal electrochemical energy conversion systems. Recent findings obtained during the development and testing of a small experimental prototype centrifugal zinc-air battery are presented to indicate possible performance trends and future prospects for this novel approach. 相似文献
15.
Kang Yuan Jing Zhu Wenjing Dong Yueguang Yu Xiaoliang Lu Xiaojuan Ji Xunying Wang 《International Journal of Hydrogen Energy》2017,42(34):22243-22249
Low-temperature solid oxide fuel cell (LTSOFC) has shown great potentials for commercial applications in clean energy generation. Seeking for low cost and easy fabrication method is one of the most important issues for LTSOFC investigations. This paper introduces a new coating spray technology, namely Low-Pressure Plasma Spray (LPPS), for efficiently manufacturing different functional coatings of LTSOFC. By applying the LPPS technique, uniform and dense Ni0.8Co0.15Al0.05LiO2?δ (NCAL) coatings were made on both solid bipolar plates and porous nickel foams to perform as protecting coatings and electrode catalyst coatings respectively. Microstructure study showed that multi phases were formed and in-situ nano-micro crystallization occurred in the coatings during the LPPS process. Around 30 W output was achieved in a 4-cell stack indicating that the LPPS sprayed NCAL coatings on bipolar plates worked well. A fuel cell based on the NCAL-coated Ni foam reached an open circuit voltage (OCV) at 1.08 V and a maximum power density of 717 mW cm?2 at 550 °C. This study reveals that LPPS is a promising technology for fabricating coatings of LTSOFC. 相似文献
16.
Low temperature and hydrogen atmosphere synthesis of crystalline LiBH4 and amorphous Li2B12H12 mixture for hydrogen storage 下载免费PDF全文
Zhengwei Xiong Xiangrong Chen Hongwen Lei Xinyou An Xuemin Wang Shiquan Feng Yuying Wang Liping Peng Weidong Wu 《国际能源研究杂志》2014,38(2):254-258
The works described a study on the preparation of LiBH4 thin films by means of pulsed laser deposition. The results indicated that crystalline LiBH4 films can be prepared from a LiB target under 70 Pa hydrogen atmosphere at ambient temperature. Compared with the former reports of LiBH4, the hydrogen atmosphere and temperature were effectively reduced for the synthetical crystalline LiBH4 films with amorphous Li2B12H12. The mixture was successively dehydrided by two steps in dehydriding reaction, corresponding to the dehydriding amount of approximately 8 and 6 mass%. Compared with the former reports of LiBH4 powder with no catalyzer, the primary dehydriding temperatures of the films was reduced. It will be easy to obtain the hydrogen from LiBH4. This opens up new possibilities to study this important hydrogen storage material. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
17.
18.
19.
熔融结晶精制技术是根据分离物质之间凝固点的不同而实现物质分离和提纯的方法,主要用于有机化合物的分离,具有产品纯度高、能耗低,不需要加入其他溶剂,对环境污染小等特点。目前已经实现工业化的熔融结晶装置可分为悬浮结晶和逐步冻凝型(即分步结晶)两类。熔融结晶精制技术目前不仅在精细化工产品和同分异构体的分离中得到了推广应用,而且在大吨位的有机化学品,如双酚A、萘等的生产中也得到了应用。可以预见,熔融结晶技术将成为生产高纯度有机化工产品的重要技术。将熔融结晶和其他分离技术耦合是目前熔融结晶精制技术研究的热点,主要研究方向集中在具体物系分离提纯的应用研究上。对于结晶过程、固-液体系相平衡的理论研究以及结晶分离技术和结晶器的研究还应进一步加强。以满足材料科学和新材料应用的需要。 相似文献
20.
The structural properties and hydrogen bonding of undoped and phosphorous doped polycrystalline silicon produced by step-by-step laser dehydrogenation and crystallization technique were investigated using Raman spectroscopy and hydrogen effusion measurements. At low laser fluences, EL, a two-layer system is created. This is accompanied by the change in hydrogen bonding. The intensity of the Si–H vibration mode at 2000 decreases faster than the one at 2100 cm−1. This is even more pronounced in phosphorous-doped specimens. The laser crystallization results in an increase of the hydrogen binding energy by approximately 0.2–0.3 eV compared to the amorphous starting materials. 相似文献