The production of fuel oil is realized by the utilization of the existing tar distillation equipment and through partial modification.
利用现有焦油蒸馏设备，通过局部改造，实现了燃料油的生产。
Heat exchange efficiency varies greatly with different structures of heat exchangers. Partial modification of the tubular heat exchanger can raise its heat exchange efficiency.
换热器的结构型式不同，其换热效率差别很大。对管壳式换热器结构做出局部改动，可以提高换热效率。
Heat exchange efficiency varies greatly with different structures of heat exchangers. Partial modification of the tubular heat exchanger can raise its heat exchange efficiency.
换热器的结构型式不同，其换热效率差别很大。对管壳式换热器结构做出局部改动，可以提高换热效率。
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