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学者姓名：孙志新
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Abstract ：
Decreasing the condensation pressure of organic Rankine cycle (ORC), which is usually limited by ambient pressure, can greatly increase the system efficiency. In this paper, the condensation pressure is extended from traditional ambient condensation to vacuum condensation. Liquefied natural gas (LNG) is used as the cold sink to generate vacuum condensation pressures between 0.001 MPa and 0.1 MPa. Nine substances with no or low flammability are chosen as the working fluids. The system main parameters are optimized with the objective of maximum exergy efficiency. The results show that the exergy efficiency of R227ea increases from 18.87% to 26.03% as the condensation pressure decreases from 0.1 MPa to 0.001 MPa. For some substances, however, their efficiencies turn to decrease as the condensation pressure is approaching 0.001 MPa and their optimal condensation pressures are different. The working fluids share the same optimal condensation temperature of around -90 degrees C under the studied conditions. R227ea is a generally good substance because of its higher critical temperature to match with heat source and lower triple point pressure (temperature) to reach lower condensation pressure (temperature). The condensation pressure always has opposite effect on exergy destructions of condenser and steam generator, as well as on direct expansion turbine and ORC turbine.
Keyword ：
Liquefied natural gas Liquefied natural gas Organic Rankine cycle Organic Rankine cycle Parameter optimization Parameter optimization Vacuum condensation Vacuum condensation
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| GB/T 7714 | Sun, Zhixin , Huang, Yisheng , Tian, Na et al. Performance improvement of ORC by breaking the barrier of ambient pressure [J]. | ENERGY , 2023 , 262 . |
| MLA | Sun, Zhixin et al. "Performance improvement of ORC by breaking the barrier of ambient pressure" . | ENERGY 262 (2023) . |
| APA | Sun, Zhixin , Huang, Yisheng , Tian, Na , Lin, Kui . Performance improvement of ORC by breaking the barrier of ambient pressure . | ENERGY , 2023 , 262 . |
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Green ammonia production system driven by renewable electricity will be under frequent dynamic operation due to the fluctuation of renewable energy. The nonlinear dynamic model of a green ammonia synthesis system is developed and the dynamic responses of PEM (proton exchange membrane) electrolysis subsystem, PSA (Pressure swing adsorption) subsystem and ammonia synthesis subsystem during the start-up process and under the fluctuation of renewable electrical current are analyzed. The start-up dynamic results show that the hydrogen production rate of PEM electrolysis system is positively correlated to the current. The nitrogen output of PSA system is affected by the adsorption time, adsorption pressure, bed length, and air velocity. A start-up period of 300 min from the warmed-up state to the design state can maintain the temperature rise rate of the ammonia synthesis reactor at approximately 40 K/h. The dynamic results under step fluctuations of electrical current show that the PEM electrolysis subsystem and the PSA subsystem response fast compared to the ammonia synthesis reactor and buffer tanks. Using large buffer tanks to smooth the fluctuation allows the system to slide with the variation of renewable current to some extent, resulting in a higher outlet ammonia fraction when the current increases. Different volume ratios of the hydrogen tank to the nitrogen tank volume can lead to different variations of the hydrogen/nitrogen ratio. PID controllers can effectively maintain the bed temperatures, hydrogen/ nitrogen ratio, and pressure of the ammonia synthesis reactor at their set points despite fluctuations in renewable electrical current. Buffer tanks are necessary to compensate for the imbalance between the flow rate fluctuation caused by current change and the flow rate regulation caused by PID controllers.
Keyword ：
Ammonia synthesis reactor Ammonia synthesis reactor Dynamic characteristics Dynamic characteristics Green ammonia synthesis Green ammonia synthesis PEM electrolysis PEM electrolysis PID control PID control Pressure swing adsorption Pressure swing adsorption
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| GB/T 7714 | Sun, Zhixin , Zhang, Yuanchao , Huang, Hongji et al. Modeling and simulation of dynamic characteristics of a green ammonia synthesis system [J]. | ENERGY CONVERSION AND MANAGEMENT , 2023 , 300 . |
| MLA | Sun, Zhixin et al. "Modeling and simulation of dynamic characteristics of a green ammonia synthesis system" . | ENERGY CONVERSION AND MANAGEMENT 300 (2023) . |
| APA | Sun, Zhixin , Zhang, Yuanchao , Huang, Hongji , Luo, Yu , Lin, Li , Jiang, Lilong . Modeling and simulation of dynamic characteristics of a green ammonia synthesis system . | ENERGY CONVERSION AND MANAGEMENT , 2023 , 300 . |
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Abstract ：
本发明涉及一种液化天然气冷能发电与重整制氢联合系统，天然气储罐连接重整反应器，重整反应器的烟气通入蒸发器和天然气预处理单元，而后汇合作为第一有机朗肯循环的热源，蒸发器的水蒸气连接重整反应器和转化炉，LNG供应源的液化天然气作为第一有机朗肯循环的冷源，然后经天然气预处理单元进入天然气储罐和重整反应器；重整反应器的合成气作为第二有机朗肯循环的热源，进行水煤气变化反应后，作为第三有机朗肯循环的热源，然后进入变压吸附单元输出净化后的氢气；LNG供应源的液化天然气作为第二、三有机朗肯循环的冷源，气化后输出天然气；三个有机朗肯循环系统连接相应的发电机向外输出电能。该系统有利于能量梯级高效利用，节能环保。
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| GB/T 7714 | 孙志新 , 田娜 , 黄毅圣 et al. 一种液化天然气冷能发电与重整制氢联合系统 : CN202210333040.2[P]. | 2022-03-31 00:00:00 . |
| MLA | 孙志新 et al. "一种液化天然气冷能发电与重整制氢联合系统" : CN202210333040.2. | 2022-03-31 00:00:00 . |
| APA | 孙志新 , 田娜 , 黄毅圣 , 赵强 . 一种液化天然气冷能发电与重整制氢联合系统 : CN202210333040.2. | 2022-03-31 00:00:00 . |
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An improved grey wolf optimization (IGWO) algorithm is presented to determine the optimal combination of a WT-PV-BS-DE islanded microgrid in order to achieve a cost effective and reliable hybrid generation system. As the traditional grey wolf optimization (GWO) algorithm has the disadvantages of slow convergence and high possibility of being trapped in local optimum, the proposed IGWO algorithm used Tent chaos mapping strategy to generate the initial population, which increases the diversity of the population. Then, the convergence factor is dynamically adjusted to maintain a better balance between global search and local search. Thirdly, Cauchy mutation operator is carried out on the current optimal individual of each generation, thus it could effectively jump out of local minima. Finally, the IGWO is applied for optimal sizing of wind power-photovoltaic modules cells-battery storage-diesel generation islanded microgrid, in which the optimization objective is minimizing of annualized system cost and the constraint condition are power supply reliability. The results show the effectiveness and applicability of the proposed method. © 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.
Keyword ：
Cost effectiveness Cost effectiveness Optimization Optimization Solar cells Solar cells Wind power Wind power
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| GB/T 7714 | Zhao, Chao , Wang, Bin , Sun, Zhixin et al. Optimal configuration optimization of islanded microgrid using improved grey wolf optimizer algorithm [J]. | Acta Energiae Solaris Sinica , 2022 , 43 (1) : 256-262 . |
| MLA | Zhao, Chao et al. "Optimal configuration optimization of islanded microgrid using improved grey wolf optimizer algorithm" . | Acta Energiae Solaris Sinica 43 . 1 (2022) : 256-262 . |
| APA | Zhao, Chao , Wang, Bin , Sun, Zhixin , Wang, Xuan . Optimal configuration optimization of islanded microgrid using improved grey wolf optimizer algorithm . | Acta Energiae Solaris Sinica , 2022 , 43 (1) , 256-262 . |
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为降低独立微电网的综合发电成本,提高供电可靠性,研究基于改进灰狼优化算法的独立微电网电源容量优化配置方法。针对基本灰狼算法在进化后期由于种群多样性的缺失而易出现局部收敛或算法早熟的问题,提出一种具有全局寻优性能的改进灰狼优化算法。改进算法首先利用Tent混沌序列产生初始种群,以增强种群的多样性;其次,通过对收敛因子设置非线性调整策略来调节算法的全局探索与局部开发之间的平衡,提高算法的收敛性;最后引入柯西变异算子有效降低算法出现早熟收敛的概率,从而全面提高算法的优化性能。在分析风力发电机-光伏组件-蓄电池/柴油发电机独立微电网各发电单元特性的基础上,建立以年均系统成本最小化为目标的独立微电网容量...
Keyword ：
光伏组件 光伏组件 容量优化配置 容量优化配置 改进灰狼优化算法 改进灰狼优化算法 独立微电网 独立微电网 风力发电 风力发电
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| GB/T 7714 | 赵超 , 王斌 , 孙志新 et al. 基于改进灰狼算法的独立微电网容量优化配置 [J]. | 太阳能学报 , 2022 , 43 (01) : 256-262 . |
| MLA | 赵超 et al. "基于改进灰狼算法的独立微电网容量优化配置" . | 太阳能学报 43 . 01 (2022) : 256-262 . |
| APA | 赵超 , 王斌 , 孙志新 , 汪轩 . 基于改进灰狼算法的独立微电网容量优化配置 . | 太阳能学报 , 2022 , 43 (01) , 256-262 . |
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为充分研究双级串联有机朗肯循环发电系统的性能,以150℃的低温余热为热源,液化天然气(LNG)为冷源,(火用)效率最大为评价指标,对不同影响因素下双级串联有机朗肯循环系统进行了工质选择与参数优化.选用7种工质,采用粒子群算法,对系统的蒸发温度、膨胀机入口温度、冷凝温度和LNG蒸发压力进行了优化,对一定过热度及中间换热温度进行了分析.结果 表明:一定过热度能提高系统的效率,中间换热温度对系统效率没有明显的影响,选用常温作为中间温度有较大意义;对系统效率影响最大的工质参数是常压沸点温度,常压沸点温度越低,系统(火用)效率越高.
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| GB/T 7714 | 王蜀家 , 孙志新 . 双级串联有机朗肯循环发电系统性能 [J]. | 化学工程 , 2021 , 49 (6) : 41-45 . |
| MLA | 王蜀家 et al. "双级串联有机朗肯循环发电系统性能" . | 化学工程 49 . 6 (2021) : 41-45 . |
| APA | 王蜀家 , 孙志新 . 双级串联有机朗肯循环发电系统性能 . | 化学工程 , 2021 , 49 (6) , 41-45 . |
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In this study, we present the evaluation of two modified single-stage Rankine cycles (RC) and two two-stage RCs to provide a guidance for configuration selection under different working conditions. Moreover, a regenerativereheat RC, which is the combination of the modified single-stage RCs, is proposed to utilize the cold energy of liquefied natural gas (LNG) and the thermal energy of low grade heat. The key parameters of these five configurations using eight working fluids are optimized with exergy efficiency as the optimization objective. The results show that the modified single-stage RCs are usually better than the two-stage RCs since they have simpler configurations with similar or higher efficiencies. The regenerative-reheat RC performs even better under most working conditions and it achieves the maximum efficiency of 24.57% by using ethane as the working fluid under the heat source temperature of 180 degrees C and the pipeline pressure of 3 MPa. The addition of direct expansion cycle can improve the exergy efficiencies of most fluids and configurations under lower pipeline pressures. However, the improvements decrease greatly for fluids with low normal boiling point temperatures (NBPTs) and especially under higher pipeline pressures. As to the fluid selection, high critical temperature and low NBPT are both important for reheat RC and parallel two-stage RC. NBPT weights more than critical temperature for regenerative RC and regenerative-reheat RC. Besides, wet working fluids are more suitable for reheat RC while dry and isentropic fluids are more suitable for regenerative RC and regenerative-reheat RC. The optimal regenerative ratio and reheat pressure ratio vary with different working fluids and working conditions. Lower reheat pressure ratio usually leads to higher regenerative ratio.
Keyword ：
Direct expansion cycle Direct expansion cycle Fluid selection Fluid selection Liquefied natural gas Liquefied natural gas Organic Rankine cycle Organic Rankine cycle Parameter optimization Parameter optimization
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| GB/T 7714 | Sun, Zhixin , Zhao, Qiang , Wu, Zhenquan et al. Thermodynamic comparison of modified Rankine cycle configurations for LNG cold energy recovery under different working conditions [J]. | ENERGY CONVERSION AND MANAGEMENT , 2021 , 239 . |
| MLA | Sun, Zhixin et al. "Thermodynamic comparison of modified Rankine cycle configurations for LNG cold energy recovery under different working conditions" . | ENERGY CONVERSION AND MANAGEMENT 239 (2021) . |
| APA | Sun, Zhixin , Zhao, Qiang , Wu, Zhenquan , Lin, Kui . Thermodynamic comparison of modified Rankine cycle configurations for LNG cold energy recovery under different working conditions . | ENERGY CONVERSION AND MANAGEMENT , 2021 , 239 . |
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对AGX变效吸收式制冷循环进行数学建模,选择高压冷凝器出口温度和1号低压发生器进出口温差(ΔT_(LG1))为自由变量,研究ΔT_(LG1)对循环运行状态与性能的影响。通过考察循环中溶液流量分配和制冷剂流量分配的变化,分析了ΔT_(LG1)对循环COP和制冷量的影响;通过考察HA-LG2热耦合环节的工作要求,总结出ΔT_(LG1)取值范围的下限约束来自HA-LG2传热量,上限约束来自HA-LG2最小传热温差与LG2出口溶液的结晶限制;模拟结果表明,在给定HG和HC出口温度的情况下,存在最佳的ΔT_(LG1),使得循环COP取极大值,且最佳ΔT_(LG1)和COP随HC出口温度变化而变化,对于给...
Keyword ：
优化 优化 变效循环 变效循环 吸收式制冷 吸收式制冷 模拟 模拟 溴化锂 溴化锂
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| GB/T 7714 | 林立 , 熊锋 , 郑文杰 et al. 低压发生器进出口温差对AGX变效循环性能的影响 [J]. | 太阳能学报 , 2020 , 41 (11) : 167-175 . |
| MLA | 林立 et al. "低压发生器进出口温差对AGX变效循环性能的影响" . | 太阳能学报 41 . 11 (2020) : 167-175 . |
| APA | 林立 , 熊锋 , 郑文杰 , 孙志新 , 刘曦 . 低压发生器进出口温差对AGX变效循环性能的影响 . | 太阳能学报 , 2020 , 41 (11) , 167-175 . |
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Two-stage Rankine cycles draw more and more attention with the increasing trade of LNG (liquefied natural gas) and the recovery of both the cold exergy of LNG and the thermal exergy of low temperature heat source. To figure out the best configuration of two-stage Rankine cycles, three mostly studied configuration, cascade twostage ORC (organic Rankine cycle), parallel two-stage ORC and two-condensation ORC are optimized and compared under different heat source temperatures and different NG distribution pressures. Ten substances are selected as the working fluids. The evaporation, condensation and expander inlet temperatures of both ORCs and the LNG regasification pressure are optimized to obtain the maximum exergy efficiency. The results show that both the increase of heat source temperature and the decrease of NG distribution pressure can improve the exergy efficiencies greatly. The increase of heat source temperature not only increases the optimal key parameters but also affects the ranking of optimal fluids, while the increase of NG distribution pressure only affects the optimal parameters. Different from conventional Rankine cycles, there is also an optimal condensation temperature to match the heat absorption line of LNG and it increases with increase of the NG distribution pressure. The LNG regasification pressure is a key parameter which determines the proportion of power outputs between ORCs and direct expansion cycles. The thermodynamic performances of parallel two-stage ORC and two-condensation ORC are almost the same, which are obviously better than that of cascade two-stage ORC. Both parallel two-stage ORC and two-condensation ORC with ammonia as the working fluid achieve the maximum efficiency of 30.54% under the heat source temperature of 200 degrees C and the NG distribution pressure of 3 MPa. Two-condensation ORC is the optimum configuration with both good thermodynamic and economic performances. The lowest electricity production cost of two-condensation ORC achieved in this paper is 0.033$/kW.h. The environmental side effect caused by working fluid leakage is negligible compared with the saved CO2 emission via the electricity generation.
Keyword ：
Fluid selection Fluid selection Liquefied natural gas Liquefied natural gas Parameter optimization Parameter optimization Power generation Power generation Rankine cycle Rankine cycle
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| GB/T 7714 | Sun, Zhixin , Zhang, Han , Zhang, Tianfeng et al. Optimizations and comparison of three two-stage Rankine cycles under different heat source temperatures and NG distribution pressures [J]. | ENERGY CONVERSION AND MANAGEMENT , 2020 , 209 . |
| MLA | Sun, Zhixin et al. "Optimizations and comparison of three two-stage Rankine cycles under different heat source temperatures and NG distribution pressures" . | ENERGY CONVERSION AND MANAGEMENT 209 (2020) . |
| APA | Sun, Zhixin , Zhang, Han , Zhang, Tianfeng , Lin, Li , Lin, Kui . Optimizations and comparison of three two-stage Rankine cycles under different heat source temperatures and NG distribution pressures . | ENERGY CONVERSION AND MANAGEMENT , 2020 , 209 . |
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Abstract ：
有机朗肯循环可高效地同时回收低温热能和液化天然气(LNG)冷能.在3个不同的热源温度下,选定10种有机工质,以标准发电成本为目标函数,采用粒子群优化算法,对带有直接膨胀循环的双级并联有机朗肯系统进行优化.结果表明,在373.15、398.15和423.15 K下,最优低温工质始终为氨,其最佳标准发电成本分别为0.4199、0.3997和0.3776元·(kW·h)-1.在最佳经济性下,热源温度为423.15 K时,其静态投资回收期约为7.1a,动态投资回收期约为10.5a.各设备的投资成本占比中,换热器总占比最大,为60％以上,工质泵占比最小,约为17％.
Keyword ：
双级有机朗肯循环 双级有机朗肯循环 投资回收期 投资回收期 液化天然气 液化天然气 经济性分析 经济性分析
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| GB/T 7714 | 张天峰 , 孙志新 , 张涵 et al. 不同热源温度的低温热能-液化天然气联合发电系统经济性分析 [J]. | 福州大学学报（自然科学版） , 2020 , 48 (4) : 532-538 . |
| MLA | 张天峰 et al. "不同热源温度的低温热能-液化天然气联合发电系统经济性分析" . | 福州大学学报（自然科学版） 48 . 4 (2020) : 532-538 . |
| APA | 张天峰 , 孙志新 , 张涵 , 林魁 . 不同热源温度的低温热能-液化天然气联合发电系统经济性分析 . | 福州大学学报（自然科学版） , 2020 , 48 (4) , 532-538 . |
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