甘醇循环量的变化不会影响天然气甘醇脱水装置干气露点。

B．28℃

C．40℃

D．80℃

B．≤28℃

C．≤40℃

D．≤80℃

A、从露点降低来看，不少方法都能满足管道输气的要求。对天然气液化前的深度脱水，则以分子筛法为最优。From the point of view of dew point reduction, many methods can meet the requirements of pipeline gas transmission. Molecular sieve method is the best method for deep dehydration before natural gas liquefaction.

B、从投资、操作费用和对操作技术的要求来看，液体吸收法——三甘醇法有突出优点，不但投资省，操作费用低，操作技术也不复杂，而且检修容易，能连续运转，易于实现自动化。From the investment, operating costs and requirements for the operation technology, liquid absorption method - triethylene glycol method has outstanding advantages, not only investment savings, low operating costs, operating technology is not complex, and maintenance easy, continuous operation, easy to achieve automation.

C、选择脱水方法还要同集输流程的规划统一考虑。如果净化厂就在集气站附近，集气管道短，先脱硫后脱水，对脱水要求就可低些，符合管输要求即可。此时以三甘醇法为最优。如果大型净化厂距起源较远，需要长距离输送含水、含硫天然气，尤其是输送高含硫天然气时，为了避免含水含硫天然气对管道和设备的腐蚀，须先深度脱水，以抗酸分子筛为最优。The selection of dehydration method should be considered in accordance with the planning of gathering and transportation process. If the purification plant is near the gas collection station, the gas collection pipeline is short, desulfurization and dehydration first, the requirements for dehydration can be lower, meet the requirements of pipeline transportation. The triethylene glycol method is the best method. If large purification plants are far from the origin, they need to transport water-containing and sulfur-bearing natural gas over a long distance, especially when transporting high-sulfur natural gas. In order to avoid the corrosion of water-containing and sulfur-bearing natural gas on pipelines and equipment, deep dehydration is required and acid-resistant molecular sieve is the best.

D、以上都不对

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.

A. 83.5^oC

B. 103.5^oC

C. 93.5^oC

D. 98.5^oC

A. 浓度降低

B. 污染

C. 分解

D. 排放损耗

A. 对甘醇管线排放

B. 对闪蒸罐排

C. 导通流程对装置进行泄压

D. 做好再次启机准备