跨海输水管路自适应加压系统的节能特性和瞬变响应研究
发布时间：2018-08-24 12:40
【摘要】：我国海域辽阔岛屿众多,为了能够较充分开发和利用我国的岛屿资源,利用跨海管道输水来解决岛屿的淡水缺乏问题,是我们开发利用岛屿资源的必要条件之一。 跨海自适应加压供水管路系统具有适时加压和高效节能的特点。本文首先较详细的介绍了跨海供水管路自适应加压系统的基本结构和原理,通过与普通加压泵站系统的比较,研究了自适应加压泵站系统的节能特性,对不同日用水过程线的水泵加压的能耗过程进行模拟计算和对比,分别绘制出了两种加压系统下水泵功率的日消耗过程线,分析了自适应加压系统在不同用水过程线情况下的节能效率,并且得到初步结果。结果表明,当用水过程波动较大、变频恒压压强较低和低用水量时间段较长时,采用自适应加压系统可以更好地提高输水系统的节能效果。 跨海自适应加压系统在瞬变切换过程中同样面临着水锤响应的问题。本文运用特征线数值模拟方法,首先对自适应加压系统在瞬变切换过程中的水锤响应进行了研究,包括在开泵和停泵过程中管道流量的瞬变和管内压力的波动情况；并且将自适应加压系统和普通泵站加压系统的水锤模拟结果进行对比,包括泵前和泵后管段流量变化的对比和管道内压力波动情况的对比；结果表明：在不利的工况下,自适应加压系统在开泵时可能出现瞬间的倒流情况,压力波动情况与普通加压系统类似；而在停泵时,自适应加压系统不管是泵前管段还是泵后管段,压力波动幅度均低于普通加压系统,所以与普通加压系统相比,在水锤响应方面具有一定的优势。除此之外,本文通过比较在不同上下游水位差的情况下,两种加压系统的停泵水锤响应特性,指出自适应加压系统的优势所在。最后本文还给出了水锤防护的常见措施和方法,并对调压塔和空气罐的水锤防护进行了简单的数值模拟研究,指出了空气罐更适合跨海输水管路的水锤防护。
[Abstract]:In order to fully exploit and utilize the island resources of our country, and to solve the problem of lack of fresh water in the islands by using cross-sea pipeline, it is one of the necessary conditions for us to develop and utilize the island resources. Cross-sea adaptive pressurized water supply pipeline system has the characteristics of timely pressurization and high efficiency and energy saving. In this paper, the basic structure and principle of the adaptive pressurization system for cross-sea water supply pipeline are introduced in detail, and the energy saving characteristics of the adaptive pressurized pumping station system are studied by comparing with the ordinary pressurized pumping station system. The energy consumption process of pump pressurized with different daily water use process lines is simulated and compared, and the daily consumption process lines of pump power under two kinds of pressurized systems are drawn respectively. The energy saving efficiency of the adaptive pressurized system under different water use process lines is analyzed, and the preliminary results are obtained. The results show that when the process of water use is fluctuating, the pressure of variable frequency constant pressure is low and the time period of low water consumption is longer, the energy saving effect of water conveyance system can be improved better by adopting adaptive pressurization system. In the transient switching process, the adaptive compression system across the sea also faces the problem of water hammer response. In this paper, the characteristic line numerical simulation method is used to study the water hammer response of the adaptive pressurized system in the transient switching process, including the transient flow of the pipeline and the fluctuation of the pressure in the pipe during the process of opening and stopping the pump. The water hammer simulation results of the adaptive pressurization system and the ordinary pump station are compared, including the comparison of the flow changes before and behind the pump and the pressure fluctuation in the pipeline. The results show that: under the unfavorable working conditions, The self-adaptive pressurization system may have a transient backflow situation when the pump is opened, and the pressure fluctuation is similar to that of the ordinary pressure system, while when the pump is stopped, the adaptive pressurization system, whether in the front section or the back section of the pump, is similar to that of the ordinary pressure system. The amplitude of pressure fluctuation is lower than that of ordinary pressure system, so it has some advantages in water hammer response compared with ordinary pressure system. In addition, by comparing the characteristics of water hammer response of two pressurized systems under different upstream and downstream water level differences, the advantages of adaptive pressurization system are pointed out. In the end, the common measures and methods of water hammer protection are given, and the simple numerical simulation of water hammer protection of air tank and surge tower is carried out. It is pointed out that air tank is more suitable for water hammer protection of water pipe across sea.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.3;TV67
本文编号：2200849
[Abstract]:In order to fully exploit and utilize the island resources of our country, and to solve the problem of lack of fresh water in the islands by using cross-sea pipeline, it is one of the necessary conditions for us to develop and utilize the island resources. Cross-sea adaptive pressurized water supply pipeline system has the characteristics of timely pressurization and high efficiency and energy saving. In this paper, the basic structure and principle of the adaptive pressurization system for cross-sea water supply pipeline are introduced in detail, and the energy saving characteristics of the adaptive pressurized pumping station system are studied by comparing with the ordinary pressurized pumping station system. The energy consumption process of pump pressurized with different daily water use process lines is simulated and compared, and the daily consumption process lines of pump power under two kinds of pressurized systems are drawn respectively. The energy saving efficiency of the adaptive pressurized system under different water use process lines is analyzed, and the preliminary results are obtained. The results show that when the process of water use is fluctuating, the pressure of variable frequency constant pressure is low and the time period of low water consumption is longer, the energy saving effect of water conveyance system can be improved better by adopting adaptive pressurization system. In the transient switching process, the adaptive compression system across the sea also faces the problem of water hammer response. In this paper, the characteristic line numerical simulation method is used to study the water hammer response of the adaptive pressurized system in the transient switching process, including the transient flow of the pipeline and the fluctuation of the pressure in the pipe during the process of opening and stopping the pump. The water hammer simulation results of the adaptive pressurization system and the ordinary pump station are compared, including the comparison of the flow changes before and behind the pump and the pressure fluctuation in the pipeline. The results show that: under the unfavorable working conditions, The self-adaptive pressurization system may have a transient backflow situation when the pump is opened, and the pressure fluctuation is similar to that of the ordinary pressure system, while when the pump is stopped, the adaptive pressurization system, whether in the front section or the back section of the pump, is similar to that of the ordinary pressure system. The amplitude of pressure fluctuation is lower than that of ordinary pressure system, so it has some advantages in water hammer response compared with ordinary pressure system. In addition, by comparing the characteristics of water hammer response of two pressurized systems under different upstream and downstream water level differences, the advantages of adaptive pressurization system are pointed out. In the end, the common measures and methods of water hammer protection are given, and the simple numerical simulation of water hammer protection of air tank and surge tower is carried out. It is pointed out that air tank is more suitable for water hammer protection of water pipe across sea.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.3;TV67
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