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Performance Study and Multi-Objective Optimization of a Two-Temperature CO_(2) Refrigeration System with Economizer Based on Energetic, Exergetic and Economic Analysis

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Journal of Thermal Science 2022年第5期31卷 1416-1433页

作者： liu guangdi ZHAO Hongxia WANG Zheng ABDULWAHID Alhasan Ali HAN Jitian School of Energy and Power engineering Shandong UniversityJi’nan250061China

A two temperature CO_(2) refrigeration system with economizer is proposed and compared with the traditional dual-temperature CO_(2) refrigeration system based on energy consumption,exergy and economic *** genetic algorithm multi-objective optimization method,taking the COP,exergy loss and total economic cost as the objective functions to find the best design conditions of the two *** Pareto fronts are obtained at different ambient *** for order preference by similarity to an ideal solution decision-making method is adopted to determine the optimum state *** simulation results show that when operating at different ambient temperatures,the introduction of economizer can improve COP,reduce exergy loss and the overall economic cost rate of the two-temperature CO_(2) refrigeration *** addition,economic analyses take the impact of carbon dioxide emission cost and electricity price into *** results indicate that with the increase of CO_(2) emission cost and electricity price,the hourly economic cost of both systems increases,but the hourly economic cost of the two-temperature CO_(2) refrigeration system with economizer system is always lower than that of conventional two-temperature CO_(2) refrigeration system.

关键词： two-temperature refrigeration CO_(2) multi-objective optimization energy exergetic economic cost

Two highly efficient accumulation models of large gas fields in China

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Petroleum Science 2014年第1期11卷 28-38页

作者： Wang Hongjun Bian Congsheng liu guangdi Sun Mingliang Li Yongxin Research Institute of Petroleum Exploration & Development CNPC China University of Petroleum

Based on reserve abundance,large gas fields in China can be divided into two types：type one of high abundance large gas fields,dominated by structural gas reservoirs; type two of low abundance large gas fields,dominated by stratigraphic and lithologic gas *** formation of these two types of large gas fields is related to the highly efficient accumulation of natural *** accumulation of high abundance gas fields is dependent on the rapid maturation of the source kitchen and huge residual pressure difference between the gas source kitchen and reservoir,which is the strong driving force for natural gas migration to *** the accumulation of low abundance gas fields is more complicated,involving both volume flow charge during the burial stage and diffusion flow charge during the uplift stage,which results in large area accumulation and preservation of natural gas in low porosity and low permeability *** conclusion should assist gas exploration in different geological settings.

关键词： Natural gas gas source kitchen highly efficient accumulation large gas field reserve abundance resource potential

Rapid hydrocarbon accumulation mechanism in later period in Kelasu thrust belt in Kuqa depression

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Science China Earth Sciences 2007年第8期50卷 1161-1170页

作者： ZOU HuaYao WANG HongJun HAO Fang liu guangdi ZHANG BaiQiao Key Lab for Hydrocarbon Accumulation Mechanism of Ministry of Education China University of PetroleumBeijing 102249China Research Institute of Petroleum Exploration and Development Beijing 100083China Department of Petroleum Geology China University of GeosciencesWuhan 430074China

Based on the analyses of generation, migration and accumulation of oil and gas in the structures of Kela 1, Kela 2 and Kela 3 in Kasangtuokai anticlinal belt using a series of geological and geochemical evidence, this paper proposes that the rapid rate of hydrocarbon generation, main drain path for over-pressured fluid flow and converging conduit system are indispensable conditions for the rapid, late-stage gas accumulation in the Kelasu thrust belt in the Kuqa depression. Due to structural over-lapping and the resultant rapid burial, the maturity of the source rocks had been increased rapidly from 1.3 to 2.5% Ro within 2.3 Ma, with an average rate of Ro increase up to 0.539% Ro/Ma. The rapid matura-tion of the source rocks had provided sufficient gases for late-stage gas accumulation. The kelasu structural belt has a variety of faults, but only the fault that related with fault propagation fold and cut through the gypsiferous mudstone cap could act as the main path for overpressured fluid release and then for fast gas accumulation in low fluid potential area. All the evidence from surface structure map, seismic profile explanation, authigenic kaolinite and reservoir property demonstrates that the main drain path related with faults for overpressured fluid and the converging conduit system are the key point for the formation of the giant Kela 2 gas field. By contrast, the Kela 1 and Kela 3 structures lo-cated on both sides of Kela 2 structure, are not favourable for gas accumulation due to lacking con-verging conduit system.

关键词： rapid hydrocarbon generation main drain path for overpressured fluid converging conduit system late-stage rapid gas accumulation Kelasu thrust belt Kuqa depression

Attention-based network embedding with higher-order weights and node attributes

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CAAI Transactions on Intelligence Technology 2024年第2期9卷 440-451页

作者： Xian Mo Binyuan Wan Rui Tang Junkai Ding guangdi liu School of Information Engineering Ningxia UniversityYinchuanChina School of Cyber Science and Engineering Sichuan UniversityChengduChina Computer Science and Information Technology University of MalayaKuala LumpurMalaysia Academy of Medical Sciences Zhengzhou UniversityZhengzhouChina

Network embedding aspires to learn a low-dimensional vector of each node in networks,which can apply to diverse data mining *** real-life,many networks include rich attributes and temporal ***,most existing embedding approaches ignore either temporal information or network attributes.A self-attention based architecture using higher-order weights and node attributes for both static and temporal attributed network embedding is presented in this article.A random walk sampling algorithm based on higher-order weights and node attributes to capture network topological features is *** static attributed networks,the algorithm incorporates first-order to k-order weights,and node attribute similarities into one weighted graph to preserve topological features of *** temporal attribute networks,the algorithm incorporates previous snapshots of networks containing first-order to k-order weights,and nodes attribute similarities into one weighted *** addition,the algorithm utilises a damping factor to ensure that the more recent snapshots allocate a greater *** features are then incorporated into topological ***,the authors adopt the most advanced architecture,Self-Attention Networks,to learn node *** results on node classification of static attributed networks and link prediction of temporal attributed networks reveal that our proposed approach is competitive against diverse state-of-the-art baseline approaches.

关键词： data mining deep neural networks social network

Microbial alteration of natural gas in Xinglongtai field of the Bohai Bay Basin, China

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Chinese Journal Of Geochemistry 2012年第1期31卷 55-63页

作者： YANG Weiwei liu guangdi GONG Yaojin FENG Yuan State Key Laboratory of Petroleum Resource and Prospecting China University of PetroleumBeijing 102249China Research Institute of Exploration and Development PetroChina Liaohe Oilfield CompanyPanjin 124010China PetroChina Changqing Oilfield Company Xi'an 710021China

Xinglongtai field has been an important petroleum-producing area of Liaohe Depression for 30 years. Oil exploration and production were the focus of this field, but the gas was ignored. This study examined twenty five gas samples with the purpose of determining the gas genetic types and their geochemical characteristics. Molecular components, stable carbon isotopic compositions and light hydrocarbons were also measured, and they proved that microbial activity has attacked some of the gas components which resulted in unusual carbon isotopic distributions. Propane seems to be selectively attacked during the initial stage of microbial alteration, with abnormally lower con-tent compared to that of butane as well as anomalously heavy carbon isotope. As a consequence, the carbon isotopic distribution among the gas components is partially reverse, as δ13C1δ13C4. Besides, n-alkanes of C3+ gas components are preferentially attacked during the process of microbial alteration. This is manifested that n-alkanes are more enriched in 13C than corresponding iso-alkanes. As a result, the concentrations of n-alkanes be-come very low, which may be misleading in indentifying the gas genetic types. As to four gas samples, light hydro-carbon compositions display evidence for microbial alteration. The sequence of hexane isomers varies obviously with high content of 2,3-DMC4, which indicates that they have been in the fourth level of extensively bacterial al-teration. So the geochemical characteristics can be affected by microbial alteration, and recognition of microbial alteration in gas accumulations is very important for interpreting the natural gas genetic types.

关键词：天然气渤海湾盆地生物改造稳定碳同位素微生物活动地球化学特征同位素分布气体成分

Power Quality Disturbance Identification Basing on Adaptive Kalman Filter andMulti-Scale Channel Attention Fusion Convolutional Network

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Energy Engineering 2024年第7期121卷 1865-1882页

作者： Feng Zhao guangdi liu Xiaoqiang Chen Ying Wang School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China

In light of the prevailing issue that the existing convolutional neural network(CNN)power quality disturbance identification method can only extract single-scale features,which leads to a lack of feature information and weak anti-noise performance,a new approach for identifying power quality disturbances based on an adaptive Kalman filter(KF)and multi-scale channel attention(MS-CAM)fused convolutional neural network is *** and composite-disruption signals are generated through *** adaptive maximum likelihood Kalman filter is employed for noise reduction in the initial disturbance signal,and subsequent integration of multi-scale features into the conventional CNN architecture is *** multi-scale features of the signal are captured by convolution kernels of different sizes so that the model can obtain diverse feature *** attention mechanism(ATT)is introduced to adaptively allocate the extracted features,and the features are fused and selected to obtain the new main *** Softmax classifier is employed for the classification of power quality ***,by comparing the recognition accuracy of the convolutional neural network(CNN),the model using the attention mechanism,the bidirectional long-term and short-term memory network(MS-Bi-LSTM),and the multi-scale convolutional neural network(MSCNN)with the attention mechanism with the proposed *** simulation results demonstrate that the proposed method is higher than CNN,MS-Bi-LSTM,and MSCNN,and the overall recognition rate exceeds 99%,and the proposed method has significant classification accuracy and robust classification *** achievement provides a new perspective for further exploration in the field of power quality disturbance classification.

关键词： Power quality disturbance kalman filtering convolutional neural network attention mechanism

Characteristics and accumulation mechanism of tight sandstone gas reservoirs in the Upper Paleozoic, northern Ordos Basin, China

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Petroleum Science 2013年第4期10卷 442-449页

作者： liu guangdi Sun Mingliang Zhao Zhongying Wang Xiaobo Wu Shenghe State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Research Institute of Petroleum Exploration & Development PetroChina

The Ordos Basin is a significant petroliferous basin in the central part of *** Carboniferous and Permian deposits of transitional and continental facies are the main gas-bearing layers in the north part of the *** Carboniferous and Permian natural gas reservoirs in the northern Ordos Basin are mainly tight sandstone reservoirs with low porosity and low permeability,developing lots of ＂sweet spots＂ with comparatively high porosity and *** tight sandstones in the study area are gas-bearing,and the sweet spots are rich in *** spots and tight sandstones are connected rather than being separated by an interface *** spot sand bodies are vertically and horizontally overlapped,forming a large gas reservoir *** fact,a reservoir formed by a single sweet spot sand body is an open gas *** the gentle dipping geological setting and with the source rocks directly beneath the tight reservoirs over a large area,the balance between gas charging into tight reservoirs from source rocks and gas loss from tight reservoirs through caprock is the key of gas accumulation in tight *** the non-Darcy flow charging driven by source-reservoir excess pressure difference and the diffusion flow charging driven by source-reservoir gas concentration difference play an important role in gas *** results of mathematical modeling indicate that the gas accumulation cannot be formed by just one of the above *** diffusion of gas from source rocks to reservoirs is a significant mechanism of tight sandstone gas accumulation.

关键词： Tight sandstone gas accumulation gas diffusion Upper Paleozoic Ordos Basin

An rescaled range analysis on the characteristics of coal seam development in the Eastern depression of the Liaohe Basin

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Mining Science and Technology 2011年第2期21卷 223-227页

作者： Zhao Zhongying Wang Yulin liu guangdi Sun Xiang State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China College of Resource and Environment Engineering Liaoning Technical University. Liaoning 123000 China State Key Laboratory of Geological Processes and Mineral Resource China University of Geosciences Beijing 100083 China

The characteristics of coal seam development,and the prospects of a favorable coal-forming area,were evaluated for the Liaohe Basin located in *** Number 3 and Number 9 coal seam thickness series from 60 nearly equally spaced bores in the Eastern depression of the Liaohe Basin were examined by a rescaled range *** results indicate that the Hurst exponents of the Number 3 and Number 9 coal seam thickness series are 0.69 and 0.68,*** suggests the presence of *** the bore spacing increases the Hurst exponent of the Number 3 series gradually decreases（H changes from 0.69 to 0.52） and shifts from persistence to *** Hurst exponent of the Number 9 thickness data gradually increases（H changes from 0.68 to 0.91） and always shows the characteristic of persistence.A combination of geological characteristics and the series data allow the conclusion that it is more suitable for the Number 9 coal seam to form in the Northeastern part of the Eastern depression than the Number 3 coal seam.

关键词： Rescaled range analysis Hurst exponent Coal seam thickness Eastern depression Liaohe Basin

Dynamic Systems of Petroleum Accumulation in the Nanpu Depression,Bohai Bay Basin,China

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Acta Geologica Sinica(English Edition) 2010年第5期84卷 1273-1285页

作者： liu guangdi SUN Mingliang ZHANG Zhihuan DONG Yuexia State Key Laboratory for Petroleum Resources and Prospecting China University of Petroleum Beijing 102249 Jidong Oil Company Petrochina Tangshan Hebei Province 063004

It is significant to distinguish the dynamic systems of petroleum accumulation （DSPA） for the understanding of petroleum accumulation and distribution. According to the formation pressure framework, genetic types of petroleum and characteristics of conduit systems, three dynamic systems of petroleum accumulation were identified in the vertical profile in the Nanpu depression, Bohai Bay basin. The deeper DSPA （including formations Es3 to Es2） is a sealed system with high-overpressure and high-mature self-sourced oil. Most of the crude oil in the system accumulated in the periods of late Oligocene （23.5 Ma） and late Pliocene （2.4 Ma）. The middle DSPA （including formations Es~ to Edl） is an overpressured half-sealed system with mature or lower-mature self-sourced oil. The accumulation of oil in the system also occurred in the late Oligocene （23.5 Ma） and late Pliocene （2.4 Ma）. The shallower DSPA （including formations Ed2 to Q） is a hydrostatic system with lower-mature aliensourced oil from the middle system. Oil within this system accumulated only in the late Pliocene period. The oil in the shallower system migrated vertically along the faults from the formerly accumulated oil in the middle system by lateral migration along the sandbodies, whereas petroleum accumulation in the deeper system was mainly derived from the system itself by lateral migration along the sandbodies and rarely migrated out of the system. In this case, it seems that the deeper system is a more potential exploration prospect in addition to the other two proved favorable systems.

关键词： dynamic system of petroleum accumulation genetic types of petroleum pressureframework accumulation process Nanpu depression