共查询到18条相似文献,搜索用时 250 毫秒
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分离捕集CO2是实现“双碳”目标的重要途径之一。常规的CO2分离方法普遍能耗较高,若能以余(废)热为动力来分离CO2则可综合利用能源、降低能耗。本文针对高碳排放但却拥有丰富余(废)热资源的燃煤电厂,提出了一种基于热流逸效应的烟气CO2分离系统,并建立了相应的分离过程数学模型和系统性能评价指标。分析表明,CO2的浓度和回收率均随热流逸式气体分离器串联级数的增加而升高,但浓度和回收率达到某一阈值后效果不再明显;典型的1000MW燃煤电厂烟气经该系统中串联的24级分离器处理后,CO2的物质的量分数最高可达98.89%,回收率达72.53%。此外,该系统可梯级利用烟气的余热,?效率为64.8%,单位能耗为0.047GJ/tCO2,与传统CO2分离方法相比具有一定节能潜力。利用热流逸效应分离CO2符合当下净零碳排放的政策导向,为CO2的分离捕集提供了新思路。 相似文献
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《高校化学工程学报》2017,(6)
为深刻认识热流逸现象,引入几何系数和净质量流量减少率,研究了13种气体在热流逸效应下压差和净质量流量与微通道结构尺寸特征、气体特性、流动领域及温差等因素的关系。结果表明,净质量流量随努森数与几何系数的增大迅速衰减,当努森数达2.4左右或几何系数达1000左右时均减少99%;在过渡流领域大部分非极性分子气体的净质量流量高于极性分子气体,且黏性指数较小的气体其净质量流量较大;在自由分子流领域,分子质量较大或黏性较大的气体其净质量流量较大。压差在过渡流领域随努森数增大而增大,当流态进入自由分子流领域后达到最大值并恒定,且较过渡流领域的峰值高约17.8%。温差每升高10 K,净质量流量与压差分别平均增大约18%和15%,且在过渡流领域,气体的黏性指数越大其净质量流量受温差的影响就越大。因微通道尺寸与气体流态相互耦合,故应视压差或流量的具体需求来确定适宜的流态与微通道结构。指出了热流逸效应若干应用需侧重考虑的要点。 相似文献
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一种特殊进口导流管的新型高效旋风分离器 总被引:4,自引:0,他引:4
本文基于对现有旋风分离器流场的分析,提出了一种具有特殊进口导流管能抑制上涡流干拢的新型高效旋风分离器,该旋风分离器具有结构简单、分离效率高及操作弹性大的特点。并利用电子计算机进行回归计算,建立了压降及分离效率的关联式。 相似文献
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考察和比较了基于液相色谱技术测定聚氨酯催化剂1,3,5-三(3-二甲基氨丙基)六氢三嗪(PC41)纯度的4种方法。包括:以液相色谱串联蒸发光散射检测器(HPLC-ELSD)或者示差折光指数检测器(HPLC-RID)测试PC41纯度的直接法;以HPLC-ELSD或者液相色谱串联紫外检测器(HPLC-UVD)测试并扣减N,N-二甲基丙二胺含量的间接法。结果显示,HPLC-RID直接测试PC41纯度的方法操作简单,适合推广。该方法使用三乙胺作为流动相改性剂,确定色谱分离温度为30℃。以质量分数0. 5%至5. 5%范围内的5个浓度点制作标准工作曲线,线性相关系数R2=0. 9991。以某公司生产的PC41作为供试品,测得其纯度为98. 3%,方法的加标回收率为99. 3%。 相似文献
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A novel concept for integrating fuel cells with desalination systems is proposed and investigated in this work. Two unique case studies are discussed — the first involving a hybrid system with a reverse osmosis (RO) unit and the second — integrating with a thermal desalination process such as multi-stage flash (MSF). The underlying motivation for this system integration is that the exhaust gas from a hybrid power plant (fuel cell/turbine system) contains considerable amount of thermal energy, which may be utilized for desalination units. This exhaust heat can be suitably used for preheating the feed in desalination processes such as reverse osmosis which not only increases the potable water production, but also decreases the relative energy consumption by approximately 8% when there is an increase of just 8°C rise in temperature. Additionally, an attractive hybrid system application which combines power generation at 70%+ system efficiency with efficient waste heat utilization is thermal desalination. In this work, it is shown that the system efficiency can be raised appreciably when a high-temperature fuel cell co-generates DC power in-situ with waste heat suitable for MSF. Results indicate that such hybrid system could show a 5.6% increase in global efficiency. Such combined hybrid systems have overall system efficiencies (second-law base) exceeding those of either fuel-cell power plants or traditional desalination plants. 相似文献
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Tingxian Li Ruzhu Wang Jeremiah K. Kiplagat 《American Institute of Chemical Engineers》2013,59(4):1334-1347
An innovative target‐oriented solid‐gas thermochemical sorption heat transformer is developed for the integrated energy storage and energy upgrade of low‐grade thermal energy. The operating principle of the proposed energy storage system is based on the reversible solid‐gas chemical reaction whereby thermal energy is stored in form of chemical bonds with thermochemical sorption process. A novel thermochemical sorption cycle is proposed to upgrade the stored thermal energy by using a pressure‐reducing desorption method during energy storage process and a temperature‐lift adsorption technique during energy release process. Theoretical analysis showed that the proposed target‐oriented thermochemical sorption heat transformer is effective for the integrated energy storage and energy upgrade, and the low‐grade thermal energy can be upgraded from 87 to 171°C using a group of sorption working pair MnCl2‐CaCl2‐NH3. Moreover, it can give the flexibility of deciding the temperature magnitude of energy upgrade by choosing appropriate sorption working pairs. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1334–1347, 2013 相似文献
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传统地下水源热泵是直接利用地下水加热蒸发器,没有有效利用地下水低品位热能。为此,提出一种利用地下水预热新风的地源热泵空调系统,实现地下水低品位热能的梯级利用,即先利用地下水预热新风,再进入地下水源热泵机组二次利用,提高了地下水热能的利用率并显著节省机组能耗。分析新系统工作原理及供热空气处理方法,运用DeST软件对夏热冬冷和寒冷地区4个典型城市(武汉、常德、北京、郑州)的某学术交流中心在整个供暖季(120 d)的逐时热负荷进行模拟,并与传统地下水源热泵空调系统的供热特性及能耗进行比较。新系统能耗远远低于传统地下水源热泵空调系统并且适用于我国夏热冬冷地区和寒冷地区,节能率均超过50%,且夏热冬冷地区节能效果更好。 相似文献
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《Drying Technology》2013,31(7):1461-1477
The authors have been studying Chemical Heat Pumps (CHP) from the viewpoints of energy saving and environmental impact. The CHP can store thermal energy in the form of chemical energy by an endothermic reaction, and release it at various temperature levels during heat demand periods by exo/endothermic reactions. The authors have proposed in an earlier study a novel chemical heat pump (CHP) system for environmentally-friendly effective utilization of thermal energy in drying as a chemical heat pump dryer (CHPD). In this exploratory study, we test the effectiveness of operating the proposed CHPDs experimentally. Basic experiments on the CHPDs such as hot dry air production for convective drying are performed on lab-scale CHPD apparatuses using gas–solid reactions in calcium oxide/calcium hydroxide reactant beds. The proposed CHPDs are found to produce hot air by CHP operation for drying. The temperature levels of the produced hot air and the reaction rates/conversions are as good as in the case of hot water supply system using basically same CHP operation. The cold heat for air dehumidification is also found to be generated/recovered by the same CHPD system. The generated heat amounts can be increased by changing the operating conditions although the heat recovery must be enhanced for practical application of CHPDs. 相似文献
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从合成气中深冷分离液化天然气(LNG)可以在调峰中发挥重要作用,并显著提升企业的经济效益。然而深冷分离的高能耗是实际工业中的一大问题。本文提出了耦合溴化锂吸收式制冷与有机朗肯循环的甲烷深冷分离工艺。新工艺可以利用原压缩制冷系统的余热从而降低制冷能耗。又因为压缩级数与能耗和可利用余热量成正相关,为使得系统的能耗最低,需同时优化压缩级数与所耦合的余热利用系统。采用自适应遗传算法对新工艺中8种不同压缩级数组合进行优化,通过对比各模型的总能耗、性能系数和单位能耗确定了能耗最低的流程。其结果表明,相比于原工艺总能耗减少了34%;性能系数增加了0.07;单位能耗减少了0.89kW/kg。经济表现为操作费用减少了33%;新增设备投资2550万元,理论上一年即可回收投资成本。 相似文献