Simulation of Underground Reservoir Stability of Pumped Storage Power Station Based on Fluid-Structure Coupling

Based on global initiatives such as the clean energy transition and the development of renewable energy,the pumped storage power station has become a new and significant way of energy storage and regulation,and its construction environment is more complex than that of a traditional reservoir.In particular,the stability of the rock strata in the underground reservoirs is affected by the seepage pressure and rock stress,which presents some challenges in achieving engineering safety and stability.Using the advantages of the numerical simulation method in dealing deal with nonlinear problems in engineering stability,in this study,the stability of the underground reservoir of the Shidangshan(SDS)pumped storage power station was numerically calculated and quantitatively analyzed based on fluid-structure coupling theory,providing an important reference for the safe operation and management of the underground reservoir.First,using the COMSOL software,a suitablemechanicalmodel was created in accordance with the geological structure and project characteristics of the underground reservoir.Next,the characteristics of the stress field,displacement field,and seepage field after excavation of the underground reservoir were simulated in light of the seepage effect of groundwater on the nearby rock of the underground reservoir.Finally,based on the construction specifications and Molar-Coulomb criterion,a thorough evaluation of the stability of the underground reservoir was performed through simulation of the filling and discharge conditions and anti-seepage strengthening measures.The findings demonstrate that the numerical simulation results have a certain level of reliability and are in accordance with the stress measured in the project area.The underground reservoir excavation resulted in a maximum displacement value of the rock mass around the caverns of 3.56 mm in a typical section,and the safety coefficient of the parts,as determined using the Molar-Coulomb criterion,was higher than 1,indicating that the project as a whole is in a stable state.

Optimal Operation for Baoying Pumping Station in East Route Project of South-to-North Water Transfer

Baoying pumping station is a part of source pumping stations in East Route Project of South-to-North Water Transfer in China. Aiming at the characteristics of head varying, and making use of the function of pump adjustable blade, mathematical models of pumping station optimal operation are established and solved with genetic algorithm. For different total pumping discharge and total pumping volume of water per day, in order to minimize pumping station operation cost, the number and operation duties of running pump units are respectively determined at different periods of time in a day. The results indicate that the saving of electrical cost is significantly effected by the schemes of adjusting blade angles and time-varying electrical price when pumping certain water volume of water per day, and compared with conventional operation schemes （namely, the schemes of pumping station operation at design blade angles based on certain pumping discharge）, the electrical cost is saved by 4.73%-31.27%. Also, compared with the electrical cost of conventional operation schemes, the electrical cost is saved by 2.03%-5.79% by the schemes of adjusting blade angles when pumping certain discharge.

STUDY ON POWER SPARE COEFFICIENT OF ELECTRICAL MOTOR IN LARGE PUMP STATION BASED ON RELIABILITY

Characters of head of low head pump station and the pump shaft power areanalyzed. Influence of each single factor on pump shaft power is expressed as change of specificshaft power. (non-dimensional) and the probability density function is determined. Influences ofmultiple factors on pump shaft power are analyzed. Method of calculating none over-loadedprobability of motor by integration by successive reductions is put forward and then relationbetween power spare coefficient and none over-loaded reliability of electric motor is established.Influences of all factors on pump shaft power being considered completely; power spare coefficientsof motor are calculated in three kinds of heads (changing and unchanging), two kinds of dirty-outconditions. Electrical motor power spare coefficients should be chosen as 1.20 approx 1.44, 1.11approx 1.19, 1.09 approx.14 respectively when pump heads are 4, 7, 9.5 m. The results mean much toreasonable choose of electrical motors in large pump stations, increasing reliability of pump unitsand saving equipment investment.

Prospect of new pumped-storage power station

In this paper, a new type of pumped-storage power station with faster response speed, wider regulation range, and better stability is proposed. The operational flexible of the traditional pumped-storage power station can be improved with variable-speed pumped-storage tech no logy. Combined with chemical en ergy storage, the failure to achieve sec on d-order response speed and the insufficient safety and reliability of pumped-storage power units could be solved. With the better solar en ergy and site resources, the in teg rated performance can be improved by an optical storage system in stalled in future pumped-storage stations. Through the characteristics analysis of the new type of pumped-storage power station, three types of optimal station locations are proposed, namely, the load concentration area, new energy concentration area, and ultrahigh- voltage direct current receiver area. Taking the new pumped-storage power station as an example, the advantages of multi-energy cooperation and joint operation are analyzed. It can be predicted that the frequency and load regulation of the power grid will be more flexible, and the service capacity to the main power grid will be much stronger in the future.

Study on integrated development and hybrid operation mode of nuclear power plant and pumped-storage power station

The nuclear power plant is suitable for base-load operation, while the pumped-storage unit mainly gives play to capacity benefit in the electric power system;hence, the integrated development and hybrid operation mode of the two can better meet the needs of the electric power system. This article first presents an analysis of the necessity and superiority of such mode, then explains its meaning and analyzes the working routes. Finally, it proposes the business modes as follows: low price pumping water electricity plus nuclear power in the near term;nuclear power shifted to pumped storage power participating in market competition in the middle term;and, in the long term, nuclear power shifted to pumped storage power as primary and serving as an electric power system when needed.

Automatic Control of Water Pumping Stations

Automatic Control of pumps is an interesting proposal to operate water pumping stations among many kinds of water pumping stations according to their functions.In this paper,our pumping station is being used for water supply system. This paper is to introduce the idea of pump controller and the important factors that must be considering when we want to design automatic control system of water pumping stations. Then the automatic control circuit with the function of all components will be introduced.

Three-dimensional CFD simulation of inlet structure flow in pumping station based on Eulerian solid- liquid two-phase flow model

Sediment deposition in the pumping station has a huge negative impact on unit operation.The three-dimensional CFD method has been used to simulate inlet structure flow in pumping station based on the Eulerian solid- liquid two-phase flow model. The numerical results of the preliminary scheme show that sediment deposition occurs in the forebay of pumping station because of poor flow pattern therein. In order to improve hydraulic configuration in the forebay,one modified measure reconstructs water diversion weir shape,and another measure sets a water retaining sill in the approach channel. The simulation results of the modified scheme prove that back flow in the forebay has been eliminated and the sediment deposition region has also been reduced.

Equivalent Substitution Based Method for Calculation of Best Installed Capacity of Pumped Storage Power Station

This paper proposes a novel method to calculate the best installed capacity of pumped storage power station. First, we choose the day with maximum load as the typical day for every month and simulate the system running in two cases of whether the pumped storage power station is put into operation. The difference of the total coal consumption between the two cases is the peak load shifting benefit. Furthermore, we build load model and power generation model to calculate the benefit of emergency use and frequency modulation, which are the major projects of dynamic benefits. At last, on the premise of ensuring the system requirements, the developed method employs the maximum benefit of the unit capacity as the objective function to get the best installed capacity of pumped storage power station by simulations. Tests on a provincial power grid have shown that the developed method which combines of load characteristics, electric structure and other factors can get the best installed capacity of pumped storage power station easily and has a certain guiding significance for the planning and construction of the pumped storage power station.

Design of the Pumping Stations and the Gas Puffing Systems for the Superconducting Tokamak HT-7U

The design of the pumping stations and the gas injection systems for the inner Chamber and the cryostat on HT-7U superconducting tokamak is described in this paper.

The feasibility experimental study of pumping and shunting pump under pressure in water injection station

At present in the process of water injection station operation, starting and stopping the pump caused system pressure fluctuations, and the fluctuations caused many problems about downstream injection wells. In order to eliminate the fluctuations and reduce problems, taking start pump, connect pump test under pressure in the water injection station installed the rotor frequency control system Changqing oil field developed. During the experiment, by progressively increasing the pressure pump to verify start pump with pressure feasibility test, the result shows when the pressure in the 0-25MPa pressure start and connect pump can be realized, and forecast the maximum pressure of the current start of the station with pressure pump. Start pump with pressure achieve the elimination of pressure fluctuations, provide the prerequisites about realizeing stable water injection pressure, and ultimately realize oil field water injection station to be automatic water injection laid a foundation.

Design and Operation of Municipal Rain and Sewage United Pumping Station

In the process of designing a municipal rainwater and sewage pumping station,it is necessary to accurately grasp the design points,reasonably determine the scale of the rainwater and sewage pumping station,scientifically select the location and layout,and select materials reasonably.After completing the process design of the municipal rainwater and sewage pumping station and putting it into operation,in order to ensure the normal and stable operation of the pumping station,it is necessary to focus on strengthening the operation and management of diving equipment,cleaning equipment,and electromechanical equipment.The author analyzes the key points and specific design path of the process design of municipal rainwater and sewage pumping stations,and puts forward effective strategies for operation management,hoping to contribute to the scientific design and stable operation of municipal rainwater and sewage pumping stations.

HYDRAULIC CALCULATION AND MEASUREMENT OF FLOW FIELD WITHIN INLET PASSAGE OF LARGE PUMPING STATION

By means of the analysis of the internal flow within inlet passage of large pumping sta-tion, an analysis of 3-D direct boundary element for the flow has been presented on the potentialflow assumption, and a calculation and an experimental proof for the inlet passage of 30 angle-type axial pumping station have been made. Based on the analysis of the calculations and theexperiments, the calculation method is feasible and believable.

地铁车站围护结构耦合埋管换热系统运行策略研究

以某地铁车站为研究对象,模拟了其全年动态负荷,确定了地源热泵参数,建立了估算热泵出力及耗电量的参数模型,结合建立的动态换热模型得到了地源热泵系统-埋管阻容耦合仿真模型。以10年为运行周期,计算了埋管出水温度和换热量,分析了不同工况下的换热性能,提出了热泵机组联合冷却塔辅助换热的运行策略。结果显示:围护结构耦合埋管换热系统在长期运行工况下存在机组停机或机组出力不足的情况,当负荷为计算负荷的80%时,可以保证热泵机组出力满足需求;冷却塔联合运行策略在制冷季可以有效降低埋管出水温度,在过渡季冷却塔的免费冷量可以降低埋管出水温度1~2℃,在长期运行工况下具有较好的地温恢复效果。

基于平抑风光波动的矿坑抽水蓄能电站出力与机组特性研究

由于我国能源结构的调整,现有抽水蓄能电站装机规模无法满足黄河流域的能源结构转型以及风、光资源大规模消纳的需求,同时由于采矿工作的结束,产生了大量废弃矿坑。以鄂尔多斯附近的废弃矿坑为研究对象,借助鄂尔多斯域内的黄河水资源,结合抽水蓄能电站的建设条件,选出4对符合抽水蓄能电站建设要求的矿坑。对待建抽水蓄能电站附近的风光资源数据进行采集,借助Meteonorm、Matlab以及Simulink等软件进行出力模拟,并对出力特性进行分析,证实抽水蓄能电站是风电、光伏发电的良好补充资源。由于水泵水轮机的国内外制造商没有成形的型谱系列,所以分别从抽水蓄能电站水轮机选型要点、抽水蓄能电站水轮机主要特征参数的选择、矿坑抽水蓄能电站水轮机选型实例3个角度对不同矿坑特性下的抽水蓄能机组进行合理选型。该研究对我国黄河流域抽水蓄能电站的建设、后续废弃矿坑的利用以及矿坑抽水蓄能机组的选型具有指导意义。

船舰式冷却系统在泵站工程中的应用

研究了船舰式冷却系统在南水北调金湖泵站工程中的应用情况,包括冷却系统的选型、配置、热平衡计算及其对泵站运行性能的影响等方面。通过实际案例分析,论文探讨了船舰式冷却系统在泵站工程中的优势和局限性,并提出了相应的优化建议。

偏心渐缩管和弯管对泵站进水管道流态的影响研究

为深入研究不同偏心渐缩管长度和弯管角度对开敞式泵站进水管道水力特性的影响,探索进水管道水力性能参数随弯管角度和偏心渐缩管长度变化的规律,以黄河下游引黄提灌泵站为例,基于Fluent仿真软件,对14种不同弯管角度和偏心渐缩管长度方案进行了数值模拟,并通过评价函数对典型断面的进水管道流场进行了流态分析。对比分析方案1—5发现:偏心渐缩管长度的改变对进水管道水力损失及出口断面处的水流速度分布均匀度和速度加权平均角的影响较大,且偏心渐缩管长度分别为600、700、800 mm时进水管道水流的整体水力特性较好。对方案6—14的计算分析发现:弯管角度的变化主要对弯管段水流流态产生影响,对其他部位的水流扰动不大。进一步结合评价函数图,得出结论:①弯管角度越大,水流过渡越平稳,水力损失越小;弯管角度越小,则水力损失越大。②偏心渐缩管长度越长,出口断面水流速度分布均匀度和速度加权平均角的值越大,整流效果越好,但水力损失也越大;偏心渐缩管长度越短,整流效果越差。

大跨度高埋深地下洞室群开挖后涌水量预测

大型地下洞室群开挖后的涌水量预测对于地下工程的安全施工与运行具有重要意义。为预测地下洞室群开挖后的涌水量,以提供排水防渗设计参考,以新疆某抽水蓄能电站大型地下厂房洞室群为研究对象,分别从地下水活动特征、钻孔压水试验成果、岩体结构面发育情况等方面分析坝址区岩体的渗透特性。为体现预测结果的可靠性,分别采用地下水动力学法和数值分析法对地下洞室群开挖后的地下水渗流场变化和正常涌水量进行分析和预测。研究结果表明:地下洞室群开挖后具有明显的渗漏和排水作用,主厂房承担了洞室群渗流的大部分涌水量,最易发生渗透破坏变形的部位位于洞室开挖线边角处。地下水动力学法和数值分析法预测的洞室群开挖后的正常涌水量分别为7442.88 m^(3)/d和7218.32 m^(3)/d,结果误差为3.1%,两者预测结果吻合较好。基于工程安全角度考虑,选取地下水动力学法佐藤邦明经验式计算结果7442.88 m^(3)/d作为该抽水蓄能电站地下厂房洞室群开挖后正常涌水量预测值。分析成果可为大型地下洞室群开挖施工及排水防渗设计提供参考依据。

一种用于掘锚机的紧凑型泵站

掘锚机的紧凑型泵站,包括油箱、电机泵组、油温油位传感器、液位计、注油组件和回油过滤器。油箱按高度不同分为高部和低部两部分,电机泵组布置在低部的上方,油温油位传感器、注油组件和回油过滤器布置在高部的顶面上,液位计布置在高部的侧壁上。泵站长度明显减小,能为掘锚机的其余结构节省出可观的安装空间。

拼装湿地循环处理对城市水体水质改善的效果

近年来,降雨径流造成城市水体有机物和氨氮浓度超标的微污染问题较为突出,影响城市人居与生态环境,亟需开发绿色高效的原位处理技术以满足微污染城市水体水质改善需求。选取城市雨水提升泵站前池为处理水体,在水体内原位设置由动力模块和高效模块组成的循环拼装湿地,通过泵站前池水体循环处理方式,去除水体污染物和提升水体自净能力;通过对拼装湿地不同模块运行水质参数〔化学需氧量(COD)、氨氮、浊度〕的连续监测及水体不同区域耗氧速率和氨氮消除速率测定,探究拼装湿地循环处理对城市微污染水体水质改善的影响。结果表明:1)拼装湿地能够稳定去除约85%的COD和87%的氨氮,水体COD和氨氮浓度分别稳定在2~3和0.2~0.3 mg/L;2)拼装湿地循环处理作用下,泵站前池水体的耗氧速率提升3~10倍,氨氮去除速率提升2~3倍;3)拼装湿地填料表面形成了具有高效脱氮除碳功能的微生物种群,保证了拼装湿地良好的污染物去除性能。拼装湿地循环处理方式不仅借助设备本身的过滤、植物吸收和微生物降解等过程去除污染物,还通过强化气液传质、提升溶解氧水平和提高生化反应速率等方式提升了所处理水体的自净能力。拼装湿地循环处理技术在净化城市河湖水体、改善水体微生态等方面具有推广应用的潜力。