The deep dehydration device uses high-efficiency molecular sieve adsorption method to dehydrate and purify raw natural gas, thus can effectively remove moisture and harmful composition such as H2S, SO2 and CO2 from natural gas and ensure high purify of natural gas. According to the volume and quality conditions of gas to be treated, different operation modes such as single-tower, double-tower, series or parallel towers can be used to actualize efficient and continuous dehydration and purification. The adsorption tower is equipped with high-efficiency filters for the front and back, which not only can prevent free oil and water from entering absorption tower and polluting molecular sieve, but also can prevent powder in dry natural gas from entering gas addition system and causing pipe obstruction. The molecular sieve can conduct repeated absorption and regeneration, with long service life and long change cycle. Model Technical indicators CNG1000/25 CNG1500/25 CNG2500/25 Absorbent Special molecular sieve Special molecular sieve Special molecular sieve Production capacity 1000Nm3/h 1500Nm3/h 2500Nm3/h Maximum working pressure 25Mpa 25Mpa 25Mpa Adsorption/regeneration cycle 8/6h 8/6h 8/6h Dew point temperature ≤-60°CUnder normal pressure ≤-60°CUnder normal pressure ≤-60°CUnder normal pressure Regenerative electric heater power 7Kw 10.5Kw 15Kw Circulating volume of regenerative gas 35 Nm3/h 45 Nm3/h 60 Nm3/h Temperature of regenerative gas ≤260°C ≤260°C ≤260°C Weight 1799Kg 2476Kg 3760Kg Overall dimensions 1800×1400×2100mm 1800×1400×2100mm 1800×1400×2100mm