高压聚乙烯二次机柱塞跳动分析及处理方案

Analysis and Treatment of the Plunger Runout in Hyper Compressor for High Pressure Polyethylene

20世纪90年代以来,中国经济一直保持快速增长。在过去长达20多年的时间里,中国经济持续保持了年均9%以上的增长速度,成为世界上经济持续增长最快的国家之一。经济的快速增长同时促进了EVA产能和消费量的增长,21世纪以来,光伏产业受清洁能源扶植政策的大力推动而在全世界发展迅速,2017年国内光伏市场持续爆发,前三季度全国新增光伏发电装机超过43×10^(6)kW,累计超过1.2×10^(8)kW,作为光伏行业太阳能电池的重要功能性膜材料,28%VA含量的EVA(光伏料)产品市场非常可观,由于光伏市场的需求持续增加,促进国内新建多套EVA生产装置,仅2021年一年国内开工6套新EVA装置,新增EVA产量为130万t/a。新建的EVA装置中的核心设备二次压缩机大多采用国外某公司产品,在装置实际运行中二次机的长周期运转成为装置长周期运行中设备方面的制约条件,其中二次机常见问题为二次机柱塞跳动联锁停机,就是针对二次机柱塞跳动问题进行分析并做相关处理方案,减少二次机联锁停机次数,避免因二次机联锁造成装置的停工次数。

Since 1990s,China′s economy has maintained rapid growth.In the past more than 20 years,China′s economy has maintained an average annual growth rate of more than 9%,making it one of the fastest growing countries in the world.The rapid economic growth has also promoted the growth of EVA production capacity and consumption.Since 2000s,the photovoltaic industry has developed rapidly all over the world with the strong promotion of clean energy policies supported.In 2017,the domestic photovoltaic market continued to grow up quickly.Just in the first three quarters,the installed capacity of new photovoltaic power generation in China exceeded 43 million kilowatts,with a total of more than 120 million kilowatts.As an important functional film material of solar cells in photovoltaic industry,the market of EVA(photovoltaic material)with 28%VA content is very remarkable.As the demand of photovoltaic market continues to increase,many new EVA production units are established in China.Only in 2021,six new EVA units were put into production in China,and the new EVA output would be 1.3 million tons per year.Most of the core equipment in the newly-built EVA plant is the hyper compressor made by a foreign company production.In the actual operation of the plant,the long-term operation of the hyper compressor becomes a constraint condition in the long-term operation of the plant,and the common problem of the hyper compressor is the interlocking shutdown of its plunger.This paper analyzed the plunger runout of the hyper compressor and provided relevant solutions,which aim to reduce the frequency of interlocking shutdowns of the hyper compressor,and avoid the shutdown caused by the interlocking of the hyper compressor.