Open type heat pump batch rectification system and control method thereof

The invention relates to the technical field of distillation systems, in particular to an open type heat pump batch rectification system and a control method thereof. The open heat pump batch rectification system comprises a rectification tower, a gas outlet pipe, a heat pump compressor, a gas inlet pipe and a material component concentration monitor; during use, materials are conveyed into the rectifying tower through the rectifying tower material inlet, the bottom of the rectifying tower is heated through steam, after the rectifying tower generates the steam, the heat pump compressor is started to pressurize and heat the gas-phase steam of the rectifying tower, and then the gas-phase steam is conveyed into the gas inlet in the bottom of the rectifying tower to heat the materials in the rectifying tower; according to the invention, except that a small amount of steam needs to be provided for heat energy at the beginning of rectification, the rest are all used for providing heat energy for the heat pump compr