共查询到19条相似文献,搜索用时 140 毫秒
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变频技术在恒压供水系统中的应用 总被引:1,自引:1,他引:0
变频恒压供水系统可根据公共管网的压力变化,通过PLC和变频器自动调节水泵的增减及电机的转速,实现恒压供水。既防止了能量空耗,又避免了电机启动时冲击电流对设备的影响。本文结合我公司洒水泵房供水系统的恒压供水变频改造,介绍了变频恒压供水系统的优点、原理及工作模式。 相似文献
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一种节能的供水运行方式 总被引:1,自引:0,他引:1
分析了我院供水系统的供水方式及其运行过程中存在的经济性问题,根据节能的需要,提出供水方式的改进方法—把完全二次供水方式改为复合供水方式,并根据运行期的情况进行分析,证明复合供水方式是一种节能的供水方式,既能达到供水的恒压性,又可达到供水的经济性,降低供水成本。 相似文献
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针对供水现状和需求问题出发,对某小(1)型水库工程中A供水泵站进行改造设计,改造主要从提升供水能力、增加机组耗能、电气更新及值班运行等方面进行.改造工程既属于增容增效改造又属于技术改造,因此该文主要从供水泵站电气、机组的更新、解决原泵站存在的技术问题及改造后能效等方面进行了论证分析,为供水泵站改造提供了技术参考和方法依... 相似文献
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许多企业都存在这样的事实 ,由于地势的差异、工艺参数的差别 ,用水的各用户对供水压力的要求是不相同的 ,但往往为了设计简便或操作便利 ,即以需用压力最高的用户的工艺参数为全供水系统运行参数的依据 ,全系统高压运行 ,这对于那些大多数用户要求供水压力不高 ,仅少数用户甚 相似文献
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An industrial model solar water heating system is designed and installed, to heat and supply 110 000 liters of hot water at 85°C per day for an egg powder making plant. It consists of a solar collector field (2560 m2), four thermally insulated hot water storage tanks (57.5 m3 capacity each) and the heat distribution system with electrically operated pumps and pneumatic valves for circulation of water. It is equipped with a PC based data acquisition system to monitor the process parameters, a fault detection system to monitor the status of various subsystems and controls for automatic operation of the system. Performance studies conducted on the various subsystems and on the system as a whole revealed that it is delivering the designed thermal output, and the net savings in furnace oil consumption is 78% on an annual basis. 相似文献
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针对有外调水源的库群联合供水调度中共同供水任务分水方法存在的不足,结合大伙房—英那河—碧流河水库联合供水的工程实例,建立了有外调水源的库群联合供水并行调节模型,并对库群联合供水常规分水方法进行了改进,提出了一种附加调节系数的动态分水方法,即以成员水库可供水量占总可供水量的比例为基数,在其前附加一个以水库蓄满率为决策变量的调节系数,通过调节系数对共同供水任务进行"二次分配"。与常规分水方法相比,此方法供水任务分配更合理,调度结果更优,可为大伙房—英那河—碧流河水库联合供水工程提供决策参考。 相似文献
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鉴于水库群是一个复杂的大系统,包括水库来水、需水和供水决策等在内的诸多方面,考虑水库群之间的库容调节特点,将水库群等效为一个聚合水库,以聚合水库调度图和供水任务分配原则作为调度模型供水决策变量,引入动态供水分配因子作为成员水库间供水分配原则,确定逐时段不同来水情况下水库群的最优供水方案及成员水库之间供水任务优化分配,建立基于合理供配水原则的水库群联合供水调度模型。实例应用结果表明,该水库群联合供水调度模型可使供水系统的水资源得到充分利用,在满足用水户设计保证率要求的同时,增大了水库群供水能力,减少了无效弃水量,并实现了供水任务在各成员水库之间的合理分配,具有显著的社会效益和经济效益。 相似文献
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为进一步优化配水系统分区,提出了一种基于多尺度分区算法的供水管网区块化优化方法。该方法考虑了供水管网系统的节点压力信息,改进了分区评价函数,并结合城市供水管网实际情况进行分区。以A市为例,利用EPANET建模器建立供水管网水力模型,在此基础上结合配水系统分区理念,将A市供水管网分为了11个区块。结果表明,分区后的供水管网实现了单独区域水量计量,缩小了查找漏失范围;管网压力更加趋于均衡,降低了漏失水量和产销差,使供水管网运行更加科学化、合理化。研究成果可为供水管网分区优化管理提供参考。 相似文献
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Alfredo P. Vega-Leal F. Rogelio Palomo Felipe Barragán Covadonga García J. Javier Brey 《Journal of power sources》2007
The current evolution in the design of fuel cell systems, together with the considerable development of integrated control techniques in microprocessor systems allows the development of portable fuel cell applications in which optimized control of the fuel cells performance is possible. Control, in the strict sense, implies a thorough knowledge of both the static and dynamic behaviour of the system comprising the stack, manifold and the compressor that enables oxygen supply. The objective of this control, far from being simply to maintain the stack free from oxygen and hydrogen shortages, is to achieve the necessary values of these gases, minimizing compressor consumption, which is the cause of the greatest inefficiency of fuel cells. This objective is essential when fuel cell systems are involved in situations where the net power of the stack is reduced and any unnecessary consumption lowers the total power available to the user. The design of an efficient control system requires the following steps: (1) modeling of the stack, compressor and other pneumatic elements involved in the system. (2) Calculation of the control equations and simulation of the entire system (including control). (3) Emulation of the stack and other pneumatic elements and simulation utilizing the designed control system. (4) Physical realization of the control system and testing within the fuel cell system. The design of a control system for fuel cell systems is introduced to manage PEMFC stacks. The control system will guarantee the correct performance of the stack around its optimal operation point, in which the net power is maximized. This means that both, the air flow and the stack temperature are controlled to a correct value. 相似文献