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办公区域和生活区域分开供暖,在供暖高负荷时由蒸气锅炉通过换热器进行补充供暖,减少设备投资和运行费用;应用锅炉分层燃烧装置和散热器恒温控制阀,充分节约能源。 相似文献
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采用基于Maisotsenko循环的露点间接蒸发式冷却作为进气冷却的手段,研究了不同环境条件下其对燃气轮机性能的提升效果。建立了针对某9E级燃气轮机的热力循环过程的计算模型,并利用该热力模型分析了进气温度变化对燃机出力的影响。基于Maisotsenko循环的原理,以温降为指标对露点间接蒸发冷却器的性能进行了分析。以功率和效率作为指标,对燃气轮机性能随环境条件的变化情况做了数值模拟,对露点蒸发式冷却与无进气冷却、直接喷雾式冷却对燃机性能的影响进行了计算分析。结果表明,在高温低湿度的条件下,露点间接蒸发式冷却能有效提升燃机性能。 相似文献
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近几年来,腐植酸以及腐植酸类物质在工业、农业、医药、环保等许多方面的试验研究都取得了良好的效益,因此引起国内外有关部门的重视。本文仅从我国近几年来利用腐植酸在处理低压锅炉炉垢方面取得的节能效益,作一简单介绍。一、腐植酸的性质和制取(一)性质:腐植酸是一种天然的有机高分子化合物,即是能够用0.3N的氧化氢钠从沉积层中萃取并随后用无机酸沉淀出来的物质,在燃料化学上被认为是一组天然的羟基羧酸。 相似文献
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简要介绍了散热器恒温控制阀的工作原理和作用,分析了应用散热器恒温控制阀后,对供暖系统各个环节的影响,就如何充分地利用散热器恒温控制阀的有利条件,使供暖系统的设计、安装和运行管理更经济更合理,降低供暖系统的投资,不断提高供暖的质量,减少供暖能源消耗提出建议。 相似文献
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蒸汽冷却及其在先进热力联合循环中的应用 总被引:2,自引:0,他引:2
本文介绍了展高性能燃气轮机采用先进冷却技术的必要性,并就现有的实际燃气轮机蒸汽冷却方案作了介绍,提出了STIG的闭路蒸汽冷却方案,并计算分析了STIG和ISTIG等先进的双工质燃气轮机联合循环中采用蒸汽冷却的可行性及其潜在优势。 相似文献
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Structural investigation of absorbents at the molecular level are very important for obtaining knowledge of their solubility. EXAFS measurements of LiBr aqueous solutions in different concentrations and with another cation, such as potassium ion, K+, or calcium ion, Ca2+, were carried out. X-ray absorption spectra at the bromine K-edge were recorded for these solutions. Hydration numbers around Br– were obtained from these spectra by means of the curve-fitting method. The results showed that the hydration number around Br– differed with the concentration of the solution, and changed when other cations were added to the solution. The same results were obtained from the molecular dynamics (MD) simulation, and the hydration number around Br– can be reasonably explained by taking long-range structure into account. © 1999 Scripta Technica, Heat Trans Asian Res, 28(6): 513–527, 1999 相似文献
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《International Journal of Hydrogen Energy》2020,45(7):4635-4643
Alloying is an effective method for improving the resistance of V metals to hydrogen embrittlement. The effects of the doping with a third element (Pd, Ru, Ta) on the structure and hydrogen permeation properties of V–10Mo solid solutions have been investigated in this study. As-prepared V–5Mo-5TM (TM = Mo, Pd, Ru, Ta) alloy samples composed of V-based solid solution with a bcc structure are hydrogenated into their corresponding solid solutions (α-phase). Structural changes caused by TM-doping have notable effects on the hydrogen permeation properties (particularly the hydrogen solubility) of V–10Mo alloy, and the ability of the doping element in decreasing the hydrogen solubility of the V–10Mo alloy follows the sequence: Pd > Ru > Ta. Their doping causes a slight decrease in the hydrogen diffusion coefficient as well as an increase in the Vickers hardness of the resulting alloys. This work demonstrates that the mechanical property of V–10Mo alloy can be improved via suitable structure control caused by alloying it with an appropriate element. In addition, this approach might be suitable for improving properties of other relevant binary alloys. 相似文献
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《International Journal of Hydrogen Energy》2022,47(86):36640-36649
The effects of five different lithium compound electrodes LiNi0.83Co0.11Mn0.06O2 (LNCM-811), LiNi0.6Co0.2Mn0.2O2 (LNCM-622), LiNi0.5Co0.2Mn0.3O2 (LNCM-523), LiMO4 (LMO) and LiCO2 (LCO) on the electrochemical performance of the ceramic fuel cells with GDC as the electrolyte were investigated. It is found that the maximum power density (MPD) of the cell with LNCM-811 as the symmetrical electrode is the highest in H2 at 550 °C among the five cells with different electrodes. The ionic conductivity of the composite electrolyte formed during performance testing in the cell with LNCM-811 as electrode is also the highest. With the decrease of Ni content in LNCM, the MPD of the cells with LNCM as electrode gradually decreases. The MPD of the cell with LCO as electrode was 196.9 mW?cm?2, and MPD of the cell with LMO as electrode was the lowest, only 4.24 mW?cm?2. According to the characterization results of SEM, FTIR and XPS of the different lithium compound electrode materials and the cells before and after performance test, it was found that the change law of the amount of molten salts such as LiOH produced by the reduction of lithium compound in H2 is consistent with the change law of the MPD of the cells. It is proved that in addition to providing enough catalysts such as Ni and Co that can catalyze the electrode reaction, the key to the outstanding power generation performance of the cell is to produce a sufficient amount of lithium compound molten salt after being reduced in H2. 相似文献
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崔海亭;陈浩松;张亚磊;李惠敏;甘拥;田景茹 《新能源进展》2025,13(2):214-222
针对冬季温室大棚内的空气与土壤温度较低,单一供暖方式造成空气、土壤温差大,作物生长缓慢,复合供暖方式研究不充分的问题,在风机与地埋管道供暖基础上提出一种适用于温室大棚的新型复合供暖系统。对供暖过程进行数值模拟,利用温度标准差、热能利用率和热干风区范围三个评价指标,探究进风参数对温室大棚温度场与速度场的影响规律。结果表明,在该复合供暖系统中,低温度高流速的进风参数组合可以使温室内气体高温区的高度明显下降,可有效降低温度标准差、保障热能利用率、控制热干风区范围;当进风温度为40℃、进风速度为3 m/s时为最佳参数组合,温度标准差为1.99×10-3,减小了15.8%;作物生长范围的热能利用率为77.65%,提高了10.93%;热干风区范围控制在5%以内。复合供暖系统改善了温室大棚内的温度分布,降低了土壤与近地面区域的温差,增强了作物生长区域的气体湍流强度,为空气供暖技术在农业温室方面改善温度均匀性、提高热能利用率、降低供暖热负荷及促进作物生长中的应用提供技术参考。 相似文献
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The present work aims to investigate the thermal behavior, kinetics, thermodynamics, and product distribution during copyrolysis of transition metal salt (Ni, Co, Zn, Cu, and Fe)-added biomass and model compounds with low density polyethylene(LDPE) over a Ni-based HZSM-5 catalyst by TGA and fixed bed reactor. The interactions and reaction mechanisms during copyrolysis were evaluated. The influence of Ni-impregnated biomass (C-M) and Ni-modified HZSM-5 (Ni/HZ) on the formation of pyrolysis bio-oil from biomass and model compounds and its subsequent effect on catalytic pyrolysis vapor upgrading was discussed. The results indicated that the presence of transition metal decreased the thermal degradation temperature and thermodynamics parameters; maximum decomposition rate, and reaction complexity. Ni/HZ catalyst could further decrease the activation energy, accelerate the reaction rate and change reaction process, and the modified samples/LDPE under copyrolysis with HZSM-5 catalyst presented a more significant effect than Ni/HZ catalyst. Subsequently, the Ea of pine, cellulose and lignin changed from 24.11, 18.29, and 28.68 kJ/mol (CP@Ni/HZ) to 56.04, 69.84, and 16.21 kJ/mol (CP-Ni@HZSM-5), respectively. In addition, Ni could inhibit the depolymerization of cellulose and promoted the formation of char, coke, and lignin derived phenolics. And Ni-impregnated biomass reduced the formation of desired aromatic hydrocarbons, but result in increasing of the char and non-condensable gases. But Ni/HZ catalysts promote the conversion of biomass to target products. 相似文献
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为了探究空间导叶和叶轮之间的径向安装间隙对泵性能影响规律,选择某VS1型太阳能高温熔盐泵首级部分作为研究对象,在其他几何参数不变的前提下,以原导叶和叶轮径向间隙值为基础,通过沿径向逐次改变导叶进口和叶轮之间的相对位置,共设计了 6组不同间隙下的导叶-叶轮组合方案,基于CFD方法对6种间隙方案(1.5~6.5 mm),进行了全流场数值模拟,并试验验证了数值算法的可靠性.研究表明:导叶与叶轮径向安装间隙对泵扬程和效率在不同工况下的影响具有显著差异性,存在较优间隙使泵性能整体最佳,间隙过大、过小时都会致使其性能劣化;与原间隙2.5 mm时相比,合适的间隙可使叶轮出口和腔体间隙处的主频压力脉动幅值分别降低20.6%和36.4%,泵内介质流动稳定性提升;导叶内流道压力梯度和腔体涡核心分布随间隙改变呈不同变化态势,间隙为4.5 mm时,导叶内流道压力梯度变化更为均匀有序,腔体内涡的范围和强度较其它方案削弱明显,泵内流态最优. 相似文献