Solvent rectification heat energy utilization device and method integrating heat pump rectification and triple-effect rectification

The invention discloses a heat pump rectification and triple-effect rectification integrated solvent rectification heat energy utilization device and method. The device comprises a solvent dehydration tower, a first de-heavy tower, a second de-heavy tower, a third de-heavy tower, a heat pump group, a heat exchanger group and a material pipeline, a tower bottom discharge line of the solvent dehydration tower is communicated with a tower body feed port of the first de-heavy tower, a tower bottom discharge line of the first de-heavy tower is communicated with a tower body feed port of the second de-heavy tower, and a tower bottom discharge line of the second de-heavy tower is communicated with a tower body feed port of the third de-heavy tower; the solvent dehydrating tower and the third de-heavy tower comprise low-pressure high-temperature steam heating lines; after being boosted and heated by a first heat pump, tower top steam of the solvent dehydrating tower exchanges heat with tower kettle liquid of the solv