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.

NUMERICAL SIMULATION FOR INCOMPRESSIBLE TURBULENT FLOW IN THE IMPELLER OF SEWAGE PUMP

The 3-D turbulent flow in the impeller of sewage pump is simulated. Thetime-averaged N-S equations and the kappa-epsilon turbulent model is modified. The calculation iscarried out in body-fitted coordinated grid by applying SIMPLE-C algorithm. The calculated velocity,pressure distributions of the turbulent flow in the sewage pump are obtained for the first time,which will be helpful for the optimal design and performance prediction of sewage pumps on the basisof flow field simulation.

Parallel Operation Characteristics Analysis of Sewage Source Heat Pump Units in Winter

Sewage source heat pump unit operates under partial load most of the time, and study on the law of coefficient of performance (COP) of the unit varying with load ratio can provide basis for the heat pump units running in high efficiency. A mathematical model determining COP, evaporation temperature and condensation temperature of a single unit was proposed. Under the condition of uniform load distribution, the model was established according to different ways of bearing partial load with the same type multiple units but different parallel operation models, and the operation characteristics of units were analyzed as well. Results show that the single screw water-source heat pump can maintain high COP only at 60%—100% load ratio, COP decreases sharply with the decrease of load ratio, and the units with parallel operation are controlled by the load ratio of a single unit according to the reduction of total load which can keep the average COP at high level within a wide load range.

Applicability of sewage heat pump air-conditioning system

A sewage heat pump system and its application based on a project in Chongqing,China,were discussed. Based on the sewage conditions,a feasibility analysis of the sewage heat pump air conditioning system was conducted. The theoretical and quantitative calculations indicate that sewage flux in the city sewage main pipe in the project can satisfy heat exchange requirements,and taking water from the pipes has relatively small influence on the pipe net in summer and winter. The sewage heat pump air-conditioning system can save 21.5% operating cost in one year,which is energy efficient and environmentally friendly.

Effects of Particle Concentration on the Dynamics of a Single-Channel Sewage Pump under Low-Flow-Rate Conditions

Single-channel sewage pumps are generally used to transport solid-liquid two-phase media consisting of a fluid and solid particles due to the good non-clogging property of such devices.However,the non-axisymmetric structure of the impeller of this type of pumps generally induces flow asymmetry,oscillatory outflow during operations,and hydraulic imbalance.In severe cases,these effects can jeopardize the safety and stability of the overall pump.In the present study,such a problem is investigated in the framework of a Mixture multiphase flow method coupled with a RNG turbulence model used to determine the structure of the flow field and the related motion of transported particles.It is shown that under different inlet particle concentrations,the flow field in the pump exhibits periodic variations of the pressure.The volume fraction of solid particles at the trailing edge of the suction surface of the blade is the largest,and solid particles tend to be concentrated at the outer edge of the pump body.With a rise in import particle content,the pressure and volume fraction of particles in the sewage pump also increase;for a fixed inlet particle concentration,the pressure pulsation amplitude increases with an increase in the flow rate.In addition,under small flow conditions,as the inlet particle concentration increases,the flow field leaving the sewage pump diaphragm near the outlet of the volute becomes more turbulent,and even a secondary back-flow vortex appears.

Design and Analysis of a Small Sewage Source Heat Pump Triple Supply System

Based on the characteristics of sewage from beauty salons,a simulation model of a small sewage source heat pump triple supply system that can be applied to such places is established to optimize the operating conditions of the system.The results show that with the increase of sewage temperature and flow,the performance of the system also increases.In summer conditions,the system provides cooling,recovers waste heat and condensed heat from sewage,with a COP value of 8.97;in winter conditions,the system heats and produces hot water,with a COP value of 2.44;in transitional seasons,only hot water is produced.The COP value is 2.75.Compared with the traditional systems which refers to the air source heat pump and hot water boiler system currently used in beauty salons,this system can save energy by 50.9%.

Strong self-flushing technique for heat exchanger of sewage source heat pump system

To better remove the contamination on the surface of a heat-exchanger in urban sewage source heat pump system (USSHPS), this paper analyzes the feasibility of strong self-flushing on the basis of experiments and presents a new on-line self-flushing technique, which alternately flushes part of heat transfer tubes. In addition, operation principles and the structure of the new heat-exchanger are introduced and the feasible economical and technological cleaning plans are given by design calculation and scheme comparison. The result shows that keeping each tube washed for one minute with 5 m/s, the operating cost is lower than $5 and when one flushing pump alternately flushes 10-20 heat exchangers, the saved costs of flushing 10 tubes alternately are over 4 times of the increased costs.

某油田联合站污水余热利用研究

原油集输系统中的热化学沉降脱水,需要将原油温度升高,这一过程将消耗大量能源,其燃料主要为天然气,加热产生大量的CO_(2)。文中通过对某油田联合站生产流程研究分析,同时结合站内用热情况,确定采用压缩式热泵替代现有燃气加热炉技术路线,用于冬季采暖和一段原油加热。项目实施后,每年可节能源8932×10^(4) MJ,折合标煤减少3481.8 t,减少CO_(2)排放2024.5 t,每年可节省能源消耗费用651.8万元,节能减排效果显著,该研究对油田联合站清洁能源替代,减少CO_(2)排放具有重要意义。

基于某商务区多源耦合供热系统运行研究

为了实现“双碳”目标,提高可再生能源的利用率,减少碳排放量,对沈阳某商务区进行规划,充分发挥区域内地热能、污水能等可再生能源灵活供热的特点,以地源热泵+污水源热泵+电锅炉3种热源耦合进行供热,为区域综合能源多能互补、灵活调度提供参考。利用DeST模拟软件建立区域建筑模型,模拟出区域建筑供暖季逐时热负荷;通过TRNSYS软件建立区域综合能源系统模型,以某典型设计为例,分别讨论了在5种工况下该耦合供热系统峰谷电时段的运行策略,并采用费用年值法对系统经济性进行分析。结果显示:该区域内办公类建筑热负荷最大;系统不蓄热时初投资最小,由于在电高峰时段增加了电锅炉运行时长,导致系统运行费用增加,系统整体经济性变差;在蓄热率为100%时,该耦合供热系统初投资较大,但运行费用较低,系统费用年值最小,经济性最优,体现了蓄热方案下降低运行费用的优势。

驱动源及低温热源双向梯级利用热泵工艺研究

为提高一次能源利用效率,针对大庆油田吸收式热泵余热提取工艺进行了改进,采用驱动源和低温热源双向梯级利用热泵工艺,提高了能源利用效率。传统热泵工艺COP为1.7,采用双效梯级利用工艺COP达到2.7。双向梯级利用热泵工艺为耦合蒸汽直拖离心式热泵和蒸汽驱动吸收式热泵对余热余压梯级利用的工艺流程,利用中温中压蒸汽梯级驱动两级热泵,充分发挥了蒸汽的做功能力;同时梯级提取含油污水低温余热,使含油污水温度从35℃降至21℃,传统热泵工艺从35℃降至25℃。综合能源利用效率较传统热泵工艺提高了50%。

污水泵内颗粒通过性能及流动损失特性研究

为了研究柱状颗粒参数对污水泵内固液两相流动特性以及通过性能的影响规律,采用CFD-DEM耦合方法计算了离心泵内固液两相流动,基于熵产理论分析了不同颗粒物性条件下泵内的流动损失特性,并通过试验对其进行了验证。结果表明:柱状颗粒长径比、体积分数和密度影响了污水泵内颗粒的通过性能以及流动损失;固相浓度从1%增大至5%,泵的扬程降低1.97 m,效率降低2.2%,颗粒通过能力逐渐降低;颗粒密度从1000 kg/m^(3)增大至2500 kg/m^(3),泵的扬程降低1.63 m,效率降低3.76%,颗粒通过能力略有增强;在各工况下,总熵产变化规律与泵性能变化规律一致,高熵产区域主要集中在叶片进口边附近,说明熵产分析能够有效反映泵内的流动损失特性。研究结果可为污水泵的优化设计提供理论依据。

矿山井下排污水系统自动化应用研究

矿山井下水仓排水系统多采用自吸式排污泵进行排放污水,排水期间需要人员手动开启水泵及阀门,并且需对水泵的排水状况进行实时监管,否则当水仓内污水排空时,若不及时关闭水泵及阀门则会引发电机烧毁、泵头机械密封损坏等一系列故障。针对这一现状,本文对矿山井下水仓排污水系统进行自动化控制改造,在原有排水系统的基础上增设电动偏心半球阀、水位传感器、搅拌机以及电气控制系统等相关部件,利用水位传感器的信号电动控制水泵的启停以阀门的开关,同时优化安装工艺并进行调试,实现了排水自动化。经过对比分析,系统故障率下降了60%,现场使用效果显著,减轻了维修人员的工作量,切实提高了矿井排水的安全性以及稳定性。

双螺旋转子泵在油田污水处理系统中的应用

油田污水处理站是地面工艺系统的重要站场,污水回收泵是其中主要耗能设备之一。当前在用的污水回收泵为卧式螺杆泵,采取负压回收方式,受采出液特性影响,螺杆泵运行状况不稳定,其表现为故障频繁、能耗高、维修费用高,困扰油田生产。为此,某油田应用双螺旋转子泵替代螺杆泵工艺,更换后,平均单台能耗下降30%,共节省电量约32×10^(4) kWh,节约维修成本费用80万元。通过对螺杆泵工艺现状进行客观论述,对双螺旋转子泵应用情况进行客观分析评价,为油田污水回收工艺提供借鉴参考。

污水泵站恶臭气体排放预测模型研究

城市污水泵站在运行过程中会散发难闻的恶臭气体,已成为扰民的主要环境问题,对周边居民的生活质量造成影响。研究选择有代表性的污水泵站,在厂界和泵站的敏感点位安装在线式恶臭气体监测仪,通过连续在线式监测恶臭气体的排放情况,获得大量的周期性的监测数据。对获得的大量监测数据进行整理和分析,建立数学算法预测模型,再把模型加载到数据监测平台中,通过对污水泵站的实时监测,验证模型预测的适用性和准确性,在此过程不断的调整模型相关参数,用来提高模型预测的适用性和准确性,研究旨在为污水泵站恶臭气体的控制提供重要的理论依据。

污水处理与排水联动的研究与应用

介绍了通过联动控制来优化污水处理站和泵房的运行,以减少人力资源的浪费、提高能源和水资源利用率以及应对紧急情况。详细分析了某煤矿泵房和污水处理厂的处理工艺,并设计了相应的控制系统。该控制系统包括硬件配置(工控机、PLC、控制柜、通讯设备与仪表等)、下位机硬件配置(主电箱、远程IO电箱等)以及上位机软件设计(WinCC监控系统),同时还阐述了泵房和污水处理厂的PLC程序设计和运行逻辑。结合实际应用检验,深入探讨了该联动控制的可行性和优越性,也为其推广提供了有力的理论支持。

青岛市某全地下污水泵站设计要点

如果沿海城市新建污水泵站的设计出现规划资料缺乏、用地紧张、周边环境要求高的情况,应该如何确定新建污水泵站的设计规模、设计扬程,是否增加预处理设施注高程单位为设备选型等这些都是技术的焦点问题。以山东省青岛市高新区某处新建污水泵站为例,该污水泵站采用全地下污水泵站,设计规模为8万m~3/d,设计扬程为17 m,工艺流程为预处理+提升设施,干式设备注意除湿设计。通过对该沿海地区现状已有污水泵站的运行情况和新建污水泵站重点设计思路的说明,总结出沿海城市污水泵站的设计注意要点,为沿海地区新建污水泵站的设计与改造提供借鉴。

污水处理厂进水泵房泵机工作点优化

针对污水处理厂进水泵房泵机运行效率低、能耗大等问题,设计了一种基于遗传算法的泵机效率寻优方法。结合上海某污水处理厂进水泵房的实测数据,对实际的泵机运行特性数据进行拟合分析,对等效率曲线和调速运行规律建立目标函数;并在约束条件下使用遗传算法对泵机效率模型进行寻优计算,找出最高效率工作点和泵机机组优化工作匹配点,以提高泵机运行效率。仿真结果表明:通过组合变频泵和对不同流量范围的泵机进行效率寻优,可以实现根据污水实际流量进行泵机的开启与最优调控,达到较好的节能效果。

大型污水泵站紧凑型布局设计创新模式探讨

随着城市化进程的加快,土地的稀缺性越来越凸显。集中建设区大量人口与产业的导入,使得城市污水量不断增长,污水泵站的规模越来越大,规划部门对污水泵站的节约用地提出更高要求。城市建设越成熟,污水泵站设计中需考虑的受限边界条件越多,进一步彰显大型泵站紧凑型布局在设计中的重要性。文章以上海惠南污水泵站为例,介绍1种紧凑型污水泵站设计布局,充分体现节约用地的理念,为后续类似工程提供参考。

浅谈污水处理厂原水提升管路改造更换的问题及对策

城镇污水处理厂的污水提升泵是污水处理中最重要的一个环节,往往通过提升泵将来水提升至污水厂内最高点,通过高低程压差自流至其他处理单元。由于污水中含有大量的腐蚀性物质,在提升泵管道支架焊接处会出现不同程度的腐蚀。尤其运行年头较长的污水处理厂,在全年满产不具备减产、停产的情况下如何更换腐蚀严重的提升泵管道是一个困扰污水处理厂运行的难题。此文提供了一种可做到在无减产、零有限空间作业的前提下完成提升泵管道更换方法,具有水量波动小,能源消耗低,更高的安全性等优势。

某地埋排水泵站结构方案对比分析

随着城市发展,城市排水系统也随之扩大。排水管道一般采取重力流形式,这就导致下游排水管道埋深越来越深,且城市排水泵站多处于城市闹市区,一般采取地埋形式以减小对周围环境的影响,综合以上因素就导致相应的泵站埋置深度也越来越深。为合理选择人和2号地埋式污水泵站的结构形式,本文采用有限元计算的方法,分别对三个模型在相同工况下的受力状况进行分析。结果表明,竖向框架的设置对于结构壁板有较好的加强作用,同时,竖向框架结构在设备安装,基坑回填,基坑占地大小等方面具有较好的优势,故建议对类似工程可采取竖向框架进行加强。