The "low-temperature regenerable carbon dioxide direct capture technology" innovatively developed by Welltech directly and efficiently adsorbs indoor CO2 gas in the form of internal circulation, and cooperates with the treatment of PM2.5, formaldehyde, benzene, TVOC, etc. to achieve the purpose of purifying indoor air. It greatly reduces the demand for outdoor ventilation of the fresh air system, thereby greatly reducing the energy consumption of heating, ventilation and air conditioning in the resulting AHU system. Its unique filter element design has a one-button automatic regeneration function, which can be recycled at low temperature, low energy consumption, and is green and environmentally friendly. It is an innovative application technology in line with the national carbon neutralization and carbon peaking policy