天然气中存在的水分在一定条件下会形成水合物，堵塞管路和设备，对于含CO2、H2S的天然气，水分会导致管内形成酸液，腐蚀管路和设备，因此在天然气外输前需要对其进行脱水处理。对比DRIZO脱水工艺与传统三甘醇脱水工艺的效果，运用HYSYS软件对两种脱水工艺流程进行模拟，在一定气体流量（20 ℃，101325 kPa）下，通过改变吸收塔塔板数、共沸剂循环速率和共沸剂种类，对影响DRIZO脱水工艺的因素进行了研究。计算可知，天然气处理量为750×104 m3/d，吸收塔操作压力为117 MPa（a），三甘醇贫液循环量为45 m3/h，正庚烷作共沸剂其质量流量为 5 kg/h，可使处理后的气体含水量满足管输要求。分别选用异辛烷、正庚烷作为共沸剂进行模拟，采用正庚烷作为共沸剂，得到的脱水后干天然气含水量和水露点最低。研究结果表明，DRIZO脱水工艺具有脱水效率高、减少BTEX排放等优点，脱水效果远远好于传统三甘醇脱水流程的脱水效果。

Moisture existing in natural gas will form hydrate in certain conditions and hydrate will block pipeline and equipment. If natural gas contains C0₂ and H₂S, moisture in natural gas will form acid liquor and corrode pipeline and equipment. Therefore, it is necessary to conduct dehydration treatment before export. Compared are effects of DRIZO dehydration proeess with traditional triethylene glycol, applied is the software HYSYS for simulating two dehydration processes. Under certain gas flow(20°C, 101.325kPa), through changing absorber plate number and circulation volume and type of azeotropic agent, studied are factors affecting DRIZO dehydration process. It is found through calculation that water content in treated gas will meet relative requirements for pipeline transportation if natural gas processing capacity is 750 x 10⁴m³/d, absorption tower operating pressure is 11.7MPa, triethylene glycol barren solution circulation volume is 4.5 m³/h and mass flow rate of n-heptane as azeotropic agent is 5 kg/h. Isooctane and n-heptane are selected as azeotropic agent respectively for simulation, water content and dew point of dry gas after dehydration are the lowest. The research results show that DRIZO dehydration process has such advantages as high dehydration efficiency and less BTEX emission and its dehydration effect is far better than traditional triethylene glycol dehydration process.