天然气半贫液脱碳工艺三元胺液配方优选

为实现天然气脱碳工厂降本增效目标，基于某工厂PZ活化MDEA半贫液工艺，在现有设备能力下进一步提升胺液性能，进行三元复配胺液配方筛选以替代原有吸收剂。本文针对单一胺液的贫液、半贫液及富液分别进行实验，确定合适的主体胺液及添加剂，将胺液进行三元复配后通过实验探究三元复配胺液的吸收及再生性能，旨在寻找吸收容量大、吸收速率快、解吸率高、循环溶解度高、再生能耗低综合性能优的胺液配方。通过研究发现，单一胺液中AMP、DETA及PZ吸收性能较优，TEA再生能耗最低，解吸率最高；对于三元复配胺液而言，当MDEA/DEEA为主体胺液时，两种胺液配方贫液状态下的吸收速率和吸收负荷均较高，MDEA/TEA双主体胺液的最终解吸率高于MDEA/DEEA双主体胺液，TEA的加入显著提高了胺液的解吸率；筛选得到的三元高效胺液配方18%MDEA+18%TEA+4%PZ的半贫液循环溶解度高于原PZ活化MDEA配方，再生能耗较低，可代替PZ活化MDEA胺液应用于天然气半贫液脱碳工艺。

Screening of ternary amine solution for natural gas semi-lean liquid decarburization process

In order to achieve the goal of reducing cost and increasing efficiency in natural gas decarburization plant, this paper, based on thesemi-lean MDEAsemi-lean liquid process activated by PZ in a plant, further improves the performance of amine liquid under the existing equipment capacity, and selects the formula of ternary complex amine liquid to replace the original absorbent. The appropriate subject amine liquid and additive were selected by experiment of barren solution with single amine liquid, half barren solution and rich liquid, respectively. Then, the absorption and regeneration performance of the ternary blends with amine liquid were studied to determine the, look for large capacity of absorption, quick absorption rates, high desorption rate, circulating high solubility and low energy consumption of regeneration of optimum comprehensive properties for determination of amine liquid formula. It was found that AMP, DETA and PZ had better absorption performance in single amine solution, and TEA has the lowest energy consumption and highest desorption rate. For ternary complex amine solution, when MDEA/DEEA was the main amine solution, the absorption rate and absorption load of the two amine solutions were both higher in the state of poor solution. The final desorption rate of MDEA/TEA dual-main amine solution was higher than that of MDEA/DEEA dual-main amine solution. The addition of TEA significantly improved the desorption rate of amine solution. The recycling solubility ofsemi-lean solution of the selected ternary high-efficiency amine solution 18%MDEA+18%TEA+4%PZ formula was higher than that of the original PZ activated MDEA formula, and the renewable energy consumption was lower, which can replace PZ activated MDEA amine solution for the decarburization process of natural gassemi-lean solution.