当天然气脱水的操作温度低于时，不宜采用三甘醇脱水（）

A. TIC—1101调节回路故障

B. 乙二醇风扇运行台数少

C. 润滑油箱油温高

D. 三甘醇泵不上量

A、沸点较高（288℃），再生温度高，贫液浓度可达98%~99%，因而，露点降比二甘醇多13～30℃; The boiling point is high (288℃), the regeneration temperature is high, the concentration of lean liquid can reach 98%~99%, so the dew point drop is 13 ~ 30℃ more than diethylene glycol.

B、蒸气压较低，27℃时仅为二甘醇的20％，因而被天然气携带损失小; The vapor pressure is low, only 20% of diethylene glycol at 27℃, so the loss caused by natural gas is small.

C、热稳定性更好，理论热分解温度为206.7℃，二甘醇为164.4℃; Thermal stability is better, theoretical thermal decomposition temperature is 206.7℃, diethylene glycol is 164.4℃;

D、脱水操作费用比二甘醇低。Dehydration costs are lower than diethylene glycol.

B．二甘醇法

C．三甘醇法

D．四甘醇法

用三甘醇对含硫天然气脱水时 ，三甘醇会吸收一些H2S，其富液将在重沸器引起腐蚀，H2S与铁生成硫化铁，使溶液呈黑色，但对三甘醇的吸湿性能并无明显影响。天然气的酸气组分过高，必然会使三甘醇溶液的pH值（应在7.5～8之间）下降。生成有机酸，对脱水不利。When the natural gas containing sulfur is dehydrated with triethylene glycol, some H2S will be absorbed by the triethylene glycol, and its rich liquid will cause corrosion in the reboiler. H2S and iron will form iron sulfide, making the solution black, but it has no obvious influence on the hygroscopic property of triethylene glycol. Too high acid gas composition of natural gas will inevitably reduce the pH value of triethylene glycol solution (which should be between 7.5 and 8). The formation of organic acids is detrimental to dehydration.