Adsorption regeneration process and system for recovering cold energy of low-temperature flue gas

The invention discloses an adsorption regeneration process and system for recovering cold energy of low-temperature flue gas, and the adsorption regeneration process comprises the following steps: an adsorption step: low-temperature flue gas with the temperature below room temperature enters an adsorption tower, and is adsorbed and purified by an adsorbent in the adsorption tower into purified flue gas; a regeneration step: heating the saturated adsorbent in the regeneration tower into a high-temperature adsorbent so as to regenerate the adsorbent; heat exchange is carried out between purified flue gas and a high-temperature adsorbent, the high-temperature adsorbent is cooled into a low-temperature adsorbent with reduced temperature, and the low-temperature adsorbent is conveyed into an adsorption tower, so that the low-temperature flue gas entering the adsorption tower is adsorbed and purified into the purified flue gas, and the adsorbent after adsorption saturation in the adsorption tower is conveyed into a