船用冷藏集装箱变频控制及特性研究
发布时间：2019-03-31 20:10
【摘要】：本文以船用冷藏集装箱制冷机组为研究对象,在综合分析当今船用冷藏集装箱主流产品的制冷机组的系统组成及容量调节方法的基础上,提出了一种新型船用冷藏集装箱制冷机组,该机组采用制冷剂R134a,容量调节部件包括变频压缩机、电子膨胀阀和热气调节阀;设计了与之匹配的控制策略,采用变频控制与热气调节,获取更大的运转范围,避免低负荷频繁启停带来的温度波动;搭建了新型船用冷藏集装箱实验平台;开展了一系列特性实验测试所搭建的船用冷藏集装箱制冷机组的性能。首先,根据冷藏集装箱额定制冷量完成制冷机组主要部件的选型,按照所设计的新型冷藏集装箱系统结构图完成冷藏集装箱实验平台的搭建。根据已搭建的制冷机组系统控制要求,完成主要电器元件的选型,设计制冷机组控制箱的总体布置,绘制控制箱电气原理图,制作制冷机组实验平台电气控制箱,合理布置实验台所用传感器,搭建冷藏集装箱实验平台参数数据采集系统。然后,设计冷藏集装箱冷藏模式快速降温控制、冷藏模式容量调节控制、冷冻模式快速降温控制、冷冻模式容量调节控制、冷藏集装箱升温控制、冷藏集装箱除霜控制六种控制模块流程。制定冷藏模式容量调节控制策略(电子膨胀阀控制、变频控制和热气调节控制)和冷冻模式容量调节控制策略(电子膨胀阀控制、变频控制和起停控制),并将控制流程及控制策略转化成PLC程序,通过工程试凑法完成PLC程序中PID温度控制参数整定。最后,利用所搭建的船用冷藏集装箱制冷机组实验台,进行了冷藏/冷冻快速降温实验、冷藏/冷冻负荷阶跃实验、冷藏/冷冻容量调节实验、设置温度阶跃实验和升温实验。实验结果表明所搭建的船用冷藏集装箱实验平台具有降温速度快(在本文实验条件下,冷藏模式从箱内温度35℃降至0℃制冷机组运行17.3分钟,平均每分钟降2℃。冷冻模式从箱内温度从27℃降至-18℃共用时35.1分钟,平均每分钟温度下降1.3℃。)、温度控制精度高(±0.2℃;由于采用新型的容量调节方式,在冷藏模式下,可以实现在低负荷运行(甚至是空箱)时将送风温度的控制精度保持在±0.2℃)、容量调节控制系统稳定、反应快速、抗干扰能力强以及制冷系统节能性较好等特点。
[Abstract]:In this paper, the refrigeration unit of marine refrigerated container is taken as the research object, and on the basis of comprehensive analysis of the system composition and capacity regulation method of the main products of marine refrigerated container, A new refrigeration unit for marine refrigerated container is presented. The unit adopts refrigerant R134A, and the capacity regulating parts include frequency conversion compressor, electronic expansion valve and hot gas regulating valve. The matching control strategy is designed, the frequency conversion control and hot air regulation are adopted to obtain a larger operating range to avoid the temperature fluctuation caused by the frequent start-up and stop of low load, a new experimental platform for marine refrigerated containers is set up, and a new type of marine refrigerated container experiment platform is set up. A series of characteristic experiments were carried out to test the performance of the refrigerated container refrigeration unit. Firstly, according to the rated refrigerating capacity of refrigerated container, the main parts of refrigerating unit are selected, and the experimental platform of refrigerated container is built according to the structure diagram of the new refrigerated container system designed in this paper. According to the control requirements of the built refrigeration unit system, the selection of the main electrical components is completed, the general arrangement of the control box of the refrigeration unit is designed, the electric schematic diagram of the control box is drawn, and the electric control box of the experimental platform of the refrigeration unit is made. Reasonable arrangement of the sensors used in the experimental platform, the establishment of the refrigerated container experimental platform parameter data acquisition system. Then, the design of refrigerated container refrigeration mode rapid cooling control, refrigeration mode capacity regulation control, freezing mode rapid cooling control, refrigeration mode capacity regulation control, refrigerated container temperature control, Refrigerated container defrosting control six control module flow. Develop refrigerated mode capacity regulation control strategies (electronic expansion valve control, frequency conversion control and hot air regulation control) and refrigeration mode capacity regulation control strategy (electronic expansion valve control, frequency conversion control and start and stop control), The control flow and control strategy are transformed into PLC program, and the parameters of PID temperature control in PLC program are adjusted by engineering trial and error method. Finally, the refrigeration / freezing fast cooling experiment, the refrigeration / freezing load step experiment, the refrigeration / freezing capacity regulation experiment, the temperature step experiment and the temperature rise experiment were carried out by using the marine refrigerated container refrigeration unit. The experimental results show that the experimental platform for marine refrigerated containers has a fast cooling speed. Under the experimental conditions, the refrigerating mode runs from 35 鈩，
本文编号：2451238
[Abstract]:In this paper, the refrigeration unit of marine refrigerated container is taken as the research object, and on the basis of comprehensive analysis of the system composition and capacity regulation method of the main products of marine refrigerated container, A new refrigeration unit for marine refrigerated container is presented. The unit adopts refrigerant R134A, and the capacity regulating parts include frequency conversion compressor, electronic expansion valve and hot gas regulating valve. The matching control strategy is designed, the frequency conversion control and hot air regulation are adopted to obtain a larger operating range to avoid the temperature fluctuation caused by the frequent start-up and stop of low load, a new experimental platform for marine refrigerated containers is set up, and a new type of marine refrigerated container experiment platform is set up. A series of characteristic experiments were carried out to test the performance of the refrigerated container refrigeration unit. Firstly, according to the rated refrigerating capacity of refrigerated container, the main parts of refrigerating unit are selected, and the experimental platform of refrigerated container is built according to the structure diagram of the new refrigerated container system designed in this paper. According to the control requirements of the built refrigeration unit system, the selection of the main electrical components is completed, the general arrangement of the control box of the refrigeration unit is designed, the electric schematic diagram of the control box is drawn, and the electric control box of the experimental platform of the refrigeration unit is made. Reasonable arrangement of the sensors used in the experimental platform, the establishment of the refrigerated container experimental platform parameter data acquisition system. Then, the design of refrigerated container refrigeration mode rapid cooling control, refrigeration mode capacity regulation control, freezing mode rapid cooling control, refrigeration mode capacity regulation control, refrigerated container temperature control, Refrigerated container defrosting control six control module flow. Develop refrigerated mode capacity regulation control strategies (electronic expansion valve control, frequency conversion control and hot air regulation control) and refrigeration mode capacity regulation control strategy (electronic expansion valve control, frequency conversion control and start and stop control), The control flow and control strategy are transformed into PLC program, and the parameters of PID temperature control in PLC program are adjusted by engineering trial and error method. Finally, the refrigeration / freezing fast cooling experiment, the refrigeration / freezing load step experiment, the refrigeration / freezing capacity regulation experiment, the temperature step experiment and the temperature rise experiment were carried out by using the marine refrigerated container refrigeration unit. The experimental results show that the experimental platform for marine refrigerated containers has a fast cooling speed. Under the experimental conditions, the refrigerating mode runs from 35 鈩，
本文编号：2451238
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