Feasibility Study of Optimisation of Scroll Air Motors and Energy Recovery from Exhaust Compressed Air

涡旋空气马达优化及废气压缩空气能量回收的可行性研究

• 批准号: EP/F027265/1
• 负责人: Jihong Wang
• 金额: $ 13.87万
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FF027265%2F1
• 关键词: Feasibility; Study; Optimisation; Scroll; Air

Although renewable resources are immense, it seems far-fetched to use all the renewable supply to satisfy our power requirement. The renewable sources, such as solar and wind power, are diffuse and intermittent. So energy storage is very important for obtaining a stable power supply. Compressed air energy storage is a well known controllable and affordable approach nowadays. The energy stored in compressed air will be used to generate electricity when required. However, the commonly used air motor (air transformer) is a cost effective traditional vane type air motor but the energy efficiency of vane type air motors is rather low, less than 30%. This is a big drawback in adopting compressed air energy storage system in the renewable resources power supply. Pneumatic actuators provide solutions through motion technology in a range of applications. In the UK, a massive amount of energy, over 10% of the National Grid output, is used to generate compressed air. Also, around 20% of electricity supplied to manufacturers/factories has been employed to generate compressed air. However, the energy efficiency of pneumatic actuator systems remains low. In European countries, an energy efficiency of between 23%-30% is achieved in working systems. It is considered that such low energy efficiencies are mainly due to the open-circuit structure of pneumatic actuator systems. Although much effort has been made, it is considered that there are no suitable mechanisms to recover energy lost through the exhaust. Therefore, there is considerable scope for research in the subject of reusing the exhaust air. A scroll air motor is a relatively new concept to pneumatic actuators. Its unique structure features its higher ability of energy conversion than conventional pneumatic actuators. The scroll technique is now mainly implemented in air conditioner and refrigeration compressors. Recently, the concept was re-invented to build scroll air motors, which are immediately adopted to drive generators for electric power generation. They have been successfully used in Micro Combined Heat and Power systems by a number of companies, such as Energetix Group Plc, Honda and Climate Energy. Scroll type air motors provide a possibly suitable actuator for recovering the energy loss at the exhaust and generating electricity efficiently for renewable power sources. It is anticipated that scroll air motors as a new type of energy efficient pneumatic actuator will be found in wide industrial and domestic applications in the near future. However, a number of fundamental problems need to be addressed before substantial progresses can be made in this area. This proposal is to seek the EPSRC support to set up a link between mathematicians and engineers to conduct the feasibility study of solving a number of fundamental issues associated with the structure of scrolls and their applications. The tasks of the project are:- to develop a complete mathematical model of scrolls based on the current scroll structure and a software program in Matlab/Simulink;- to set up a novel system to recycle pneumatic actuator exhaust air to improve energy efficiency in the laboratory at Birmingham;- to investigate the dynamic behaviour of scroll air motors while they are working at a low pressure of compressed air supply with variable air flow rates;- to investigate how the recycling equipment at down stream affects the behaviour of the pneumatic actuators;- to investigate a feasible control strategy for generating a stable electrical power at a variable pressure of compressed air supply with uncertain flow rates;- to investigate different shapes of scrolls which will lead to high energy efficiency using a differential geometry method;- to investigate how the design parameters affect the energy efficiency of scroll air motors through madelling and simulation study - optimisation;- to verify mathematical model and simulation results.

虽然可再生资源是巨大的，但使用所有的可再生能源来满足我们的电力需求似乎有些牵强。可再生能源，如太阳能和风能，是分散和间歇性的。因此，储能对于获得稳定的电源非常重要。压缩空气储能是当今众所周知的可控且经济实惠的方法。储存在压缩空气中的能量将在需要时用于发电。然而，常用的空气马达（空气Transformer）是具有成本效益的传统叶片式空气马达，但是叶片式空气马达的能量效率相当低，小于30%。这是在可再生资源电源中采用压缩空气储能系统的一大缺点。气动执行器通过运动技术在一系列应用中提供解决方案。在英国，大量的能源，超过国家电网输出的10%，用于产生压缩空气。此外，供应给制造商/工厂的电力中约有20%用于产生压缩空气。然而，气动致动器系统的能量效率仍然很低。在欧洲国家，工作系统的能源效率在23%-30%之间。据认为，这种低能量效率主要是由于气动执行器系统的开路结构。尽管已经做出了很多努力，但是认为没有合适的机制来回收通过排气损失的能量。因此，在废气再利用的课题上有相当大的研究空间。涡旋空气马达是气动执行器的一个相对较新的概念。其独特的结构特点是具有比传统气动执行器更高的能量转换能力。涡旋技术目前主要应用于空调和制冷压缩机。最近，这一概念被重新发明，用于建造涡旋空气马达，这些马达立即被用于驱动发电机发电。它们已被许多公司成功地用于微型热电联产系统，如Energetix Group Plc，本田和Climate Energy。涡旋式气动马达提供了可能合适的致动器，用于回收排气处的能量损失并有效地为可再生能源发电。涡旋式气动马达作为一种新型的节能型气动执行器，在工业和民用领域有着广阔的应用前景。然而，在这一领域取得实质性进展之前，需要解决一些基本问题。该提案旨在寻求EPSRC的支持，在数学家和工程师之间建立联系，以进行可行性研究，解决与卷轴结构及其应用相关的一些基本问题。该项目的任务是：-根据当前的涡旋结构和Matlab/Simulink软件程序开发一个完整的涡旋数学模型;-在伯明翰的实验室建立一个新的系统来回收气动致动器的废气，以提高能源效率;-研究涡旋空气发动机在低压压缩空气供应和可变空气流速下工作时的动态行为;- 研究下游的再循环设备如何影响气动致动器的行为;-研究可行的控制策略，以在不确定流速的压缩空气供应的可变压力下产生稳定的电力;- 利用微分几何学方法研究可提高能源效率的不同形状的涡卷;- 通过建模和仿真研究-优化，研究设计参数如何影响涡旋空气发动机的能效;验证数学模型和仿真结果。

项目成果

An energy efficient pneumatic-electricity system - modelling study of the scroll expender

高效节能的气电系统——涡旋膨胀机的建模研究

• 发表时间: 2008
• 作者: J Wang

Energy Efficiency Improvement of Pneumatic Systems by Recovery of Exhaust Energy Using Scroll Technology

利用涡旋技术回收废气能量，提高气动系统的能源效率

• 发表时间: 2008
• 作者: J Wang

Mathematical Model and Energy Efficiency Analysis of a Scroll-type Air Motor

涡旋式气动马达数学模型及能效分析

• 发表时间: 2008
• 期刊: IAENG International Journal of Applied Mathematics
• 作者: J Wang

Development of a mathematical model for vane-type air motors with arbitrary N vanes

具有任意 N 个叶片的叶片式气动马达数学模型的开发

• 发表时间: 2008
• 作者: X Luo