船用冷藏集裝箱變頻控制及特性研究
發(fā)布時間：2019-03-31 20:10
【摘要】：本文以船用冷藏集裝箱制冷機組為研究對象,在綜合分析當今船用冷藏集裝箱主流產品的制冷機組的系統(tǒng)組成及容量調節(jié)方法的基礎上,提出了一種新型船用冷藏集裝箱制冷機組,該機組采用制冷劑R134a,容量調節(jié)部件包括變頻壓縮機、電子膨脹閥和熱氣調節(jié)閥;設計了與之匹配的控制策略,采用變頻控制與熱氣調節(jié),獲取更大的運轉范圍,避免低負荷頻繁啟停帶來的溫度波動;搭建了新型船用冷藏集裝箱實驗平臺;開展了一系列特性實驗測試所搭建的船用冷藏集裝箱制冷機組的性能。首先,根據冷藏集裝箱額定制冷量完成制冷機組主要部件的選型,按照所設計的新型冷藏集裝箱系統(tǒng)結構圖完成冷藏集裝箱實驗平臺的搭建。根據已搭建的制冷機組系統(tǒng)控制要求,完成主要電器元件的選型,設計制冷機組控制箱的總體布置,繪制控制箱電氣原理圖,制作制冷機組實驗平臺電氣控制箱,合理布置實驗臺所用傳感器,搭建冷藏集裝箱實驗平臺參數數據采集系統(tǒng)。然后,設計冷藏集裝箱冷藏模式快速降溫控制、冷藏模式容量調節(jié)控制、冷凍模式快速降溫控制、冷凍模式容量調節(jié)控制、冷藏集裝箱升溫控制、冷藏集裝箱除霜控制六種控制模塊流程。制定冷藏模式容量調節(jié)控制策略(電子膨脹閥控制、變頻控制和熱氣調節(jié)控制)和冷凍模式容量調節(jié)控制策略(電子膨脹閥控制、變頻控制和起�？刂�),并將控制流程及控制策略轉化成PLC程序,通過工程試湊法完成PLC程序中PID溫度控制參數整定。最后,利用所搭建的船用冷藏集裝箱制冷機組實驗臺,進行了冷藏/冷凍快速降溫實驗、冷藏/冷凍負荷階躍實驗、冷藏/冷凍容量調節(jié)實驗、設置溫度階躍實驗和升溫實驗。實驗結果表明所搭建的船用冷藏集裝箱實驗平臺具有降溫速度快(在本文實驗條件下,冷藏模式從箱內溫度35℃降至0℃制冷機組運行17.3分鐘,平均每分鐘降2℃。冷凍模式從箱內溫度從27℃降至-18℃共用時35.1分鐘,平均每分鐘溫度下降1.3℃。)、溫度控制精度高(±0.2℃;由于采用新型的容量調節(jié)方式,在冷藏模式下,可以實現在低負荷運行(甚至是空箱)時將送風溫度的控制精度保持在±0.2℃)、容量調節(jié)控制系統(tǒng)穩(wěn)定、反應快速、抗干擾能力強以及制冷系統(tǒng)節(jié)能性較好等特點。
[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，
本文編號：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，
本文編號：2451238
本文鏈接：http://www.sikaile.net/kejilunwen/chuanbolw/2451238.html
