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简要介绍该公司原中低低变换工艺存在的问题，经两次技改为全低变工艺后，运行效果良好，达到了节能降耗和提高经济效益的目的。“,”The paper briefly introduces existing problems of medium-low-low temperature shift in the company, after two technical improvements to total low temperature shift, and gets good operation effect, reaching purpose of saving energy and improving economic efficiency.