潮汐能直接驱动海水淡化的装置系统及其试验研究
发布时间：2019-06-20 01:31
【摘要】：反渗透海水淡化技术相比其他海水淡化技术具有腐蚀和结垢轻微、设备投资少等优点,近几十年发展迅速。但是这种方法需要提供大量的电能来制取高压海水,这不仅增加了海水淡化的成本和提高了碳排放,还加剧了能源危机。前期课题组以解决高能耗、高成本和高碳排放为目的,提出了潮汐能海水淡化的方案,但未能从实际出发证明此方案是可行的。本文的目的是研究潮汐能反渗透海水淡化方案的可行性;研制一套潮汐能聚能增压装置;通过试验研究其增压效果及其它运行性能;本文还针对潮汐能海水淡化和制盐一整套流程,提出一套可实现双效节能的脉动能交换装置的设计方案。本文通过搭建潮汐能海水淡化试验平台,研制柱塞式潮汐能聚能增压装置,并且给潮汐能聚能增压装置匹配反渗透膜组件,来测试潮汐能海水淡化系统运行的数据,以此证明潮汐能海水淡化方案的可行性以及发现其中存在的问题。测试和研究结果表明:当水位高度一定时,随着管道内水流量的增加,增压装置的转速逐渐增大,海水的压力也逐渐增大;当管道内水的流量一定时,随着水位高度的增加,增压装置的转速逐渐增大,海水的压力也逐渐增大;随着海水压力的增加,海水压力增长的越来越慢,因为海水压力越大时,对海水的加压越困难;反渗透膜组件进水口处海水压力已经达到6Mpa,满足了反渗透海水淡化对海水压力的要求;试验过程总产出了淡水,产出淡水的速度也会受到潮汐水位和进入潮汐能聚能增压装置内海水流量的影响;柱塞式聚能增压装置出口处的高压海水的压力是脉动的,压力的脉动会影响潮汐能海水淡化系统的稳定运行,也会降低生产淡水的质量,因此需要把海水的压力稳定下来。本文在实际测试了大量的数据、查阅了相关文献基础上得到了如下的结论:柱塞式潮汐能聚能增压方案是可行的,海水压力满足了反渗透海水淡化的要求;潮汐能反渗透海水淡化方案是可行的;课题组提出的海水淡化和制盐一体化的方法,能够更有效的解决聚能增压装置出口处高压海水的压力脉动问题,因此该方法是在无需额外耗能的情况下,将高压海水的压力脉动直接转移到了制盐过程所需要的热气流中,即节省了稳压装置和产生脉动热气流的装置,又大幅度提高了潮汐能的利用效率,达到了双向节能的效果;课题组在解决高压海水压力脉动时,设计了变频式脉动能交换器,该交换器属于国内外首创。
[Abstract]:Compared with other seawater desalination technologies, reverse osmosis seawater desalination technology has the advantages of mild corrosion and scaling, less equipment investment and so on, and has developed rapidly in recent decades. However, this method needs to provide a lot of electricity to produce high pressure seawater, which not only increases the cost of seawater desalination and increases carbon emissions, but also aggravates the energy crisis. In order to solve the problem of high energy consumption, high cost and high carbon emission, the previous research group put forward a scheme of tidal energy desalination, but it failed to prove that this scheme is feasible from the actual point of view. The purpose of this paper is to study the feasibility of tidal energy reverse osmosis seawater desalination scheme, to develop a set of tidal energy accumulation supercharging device, to study its supercharging effect and other operating performance through experiments, and to propose a design scheme of pulsating energy exchange device which can realize double energy saving for tidal energy desalination and salt making. In this paper, a plunger type tidal energy accumulation supercharging device is developed by building a tidal energy desalination test platform, and the tidal energy accumulation supercharging device is matched with reverse osmosis membrane module to test the operation data of the tidal energy seawater desalination system, so as to prove the feasibility of the tidal energy seawater desalination scheme and find out the existing problems. The test and research results show that when the water level height is constant, with the increase of water flow rate in the pipeline, the rotating speed of the supercharging device increases gradually, and the pressure of seawater increases gradually when the water flow rate in the pipeline is constant, with the increase of the water level height, the rotating speed of the supercharging device increases gradually, and the pressure of seawater increases gradually. With the increase of seawater pressure, the increase of seawater pressure is more and more slow, because when the sea water pressure is higher, the pressure of seawater is more difficult; the seawater pressure at the inlet of reverse osmosis membrane module has reached 6Mpa. the seawater pressure of reverse osmosis seawater desalination meets the requirements of seawater pressure of reverse osmosis seawater desalination; the total output of fresh water is produced during the test process, and the speed of fresh water production will also be affected by the tidal water level and the flow rate of seawater entering the tidal energy accumulation supercharging device. The pressure of high pressure seawater at the outlet of plunger supercharging device is pulsating, and the fluctuation of pressure will affect the stable operation of tidal energy desalination system and reduce the quality of fresh water production, so it is necessary to stabilize the pressure of seawater. In this paper, a large number of data have been tested in practice, and the following conclusions have been obtained on the basis of consulting the relevant literature: the plunger tidal energy accumulation scheme is feasible, the seawater pressure meets the requirements of reverse osmosis seawater desalination, and the tidal energy reverse osmosis seawater desalination scheme is feasible. The integrated method of seawater desalination and salt production proposed by the research group can more effectively solve the problem of pressure fluctuation of high pressure seawater at the outlet of the energy accumulation supercharging device. Therefore, this method transfers the pressure fluctuation of high pressure seawater directly to the hot air flow needed in the salt making process without additional energy consumption, that is, it saves the pressure stabilizing device and the device that produces fluctuating hot air flow, and greatly improves the utilization efficiency of tidal energy. The effect of two-way energy saving is achieved. When solving the fluctuating pressure of high pressure seawater, the research group has designed a variable frequency pulsating energy exchanger, which is the first at home and abroad.
【学位授予单位】：广东海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P747;P743.3
本文编号：2502805
[Abstract]:Compared with other seawater desalination technologies, reverse osmosis seawater desalination technology has the advantages of mild corrosion and scaling, less equipment investment and so on, and has developed rapidly in recent decades. However, this method needs to provide a lot of electricity to produce high pressure seawater, which not only increases the cost of seawater desalination and increases carbon emissions, but also aggravates the energy crisis. In order to solve the problem of high energy consumption, high cost and high carbon emission, the previous research group put forward a scheme of tidal energy desalination, but it failed to prove that this scheme is feasible from the actual point of view. The purpose of this paper is to study the feasibility of tidal energy reverse osmosis seawater desalination scheme, to develop a set of tidal energy accumulation supercharging device, to study its supercharging effect and other operating performance through experiments, and to propose a design scheme of pulsating energy exchange device which can realize double energy saving for tidal energy desalination and salt making. In this paper, a plunger type tidal energy accumulation supercharging device is developed by building a tidal energy desalination test platform, and the tidal energy accumulation supercharging device is matched with reverse osmosis membrane module to test the operation data of the tidal energy seawater desalination system, so as to prove the feasibility of the tidal energy seawater desalination scheme and find out the existing problems. The test and research results show that when the water level height is constant, with the increase of water flow rate in the pipeline, the rotating speed of the supercharging device increases gradually, and the pressure of seawater increases gradually when the water flow rate in the pipeline is constant, with the increase of the water level height, the rotating speed of the supercharging device increases gradually, and the pressure of seawater increases gradually. With the increase of seawater pressure, the increase of seawater pressure is more and more slow, because when the sea water pressure is higher, the pressure of seawater is more difficult; the seawater pressure at the inlet of reverse osmosis membrane module has reached 6Mpa. the seawater pressure of reverse osmosis seawater desalination meets the requirements of seawater pressure of reverse osmosis seawater desalination; the total output of fresh water is produced during the test process, and the speed of fresh water production will also be affected by the tidal water level and the flow rate of seawater entering the tidal energy accumulation supercharging device. The pressure of high pressure seawater at the outlet of plunger supercharging device is pulsating, and the fluctuation of pressure will affect the stable operation of tidal energy desalination system and reduce the quality of fresh water production, so it is necessary to stabilize the pressure of seawater. In this paper, a large number of data have been tested in practice, and the following conclusions have been obtained on the basis of consulting the relevant literature: the plunger tidal energy accumulation scheme is feasible, the seawater pressure meets the requirements of reverse osmosis seawater desalination, and the tidal energy reverse osmosis seawater desalination scheme is feasible. The integrated method of seawater desalination and salt production proposed by the research group can more effectively solve the problem of pressure fluctuation of high pressure seawater at the outlet of the energy accumulation supercharging device. Therefore, this method transfers the pressure fluctuation of high pressure seawater directly to the hot air flow needed in the salt making process without additional energy consumption, that is, it saves the pressure stabilizing device and the device that produces fluctuating hot air flow, and greatly improves the utilization efficiency of tidal energy. The effect of two-way energy saving is achieved. When solving the fluctuating pressure of high pressure seawater, the research group has designed a variable frequency pulsating energy exchanger, which is the first at home and abroad.
【学位授予单位】：广东海洋大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P747;P743.3
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