高含硫天然气超重力脱硫技术研究

基于MDEA溶液和不同配比位阻胺溶液对H2S吸收容量的静态测定实验结果，在操作压力为8.3 MPa的超重力侧线试验装置上，考察不同气液比条件下MDEA溶液和优化配方的位阻胺溶液对高酸性天然气的选择性脱硫效果，同时考察了超重力机转速对溶剂选择性脱硫效果的影响。结果表明，几种溶剂中以8号溶剂对H2S的吸收容量最大，40 ℃和50 ℃条件下H2S的最大吸收容量分别为79.67 g/L和59.20 g/L，采用超重力脱硫工艺，可将天然气中硫化氢质量浓度由2.0×105 mg/m3降至100 mg/m3以下，在气液比95左右时，净化气中H2S、总硫质量浓度分别为19.8 mg/m3和32.27 mg/m3，CO2体积分数为0.38%，达到二类天然气指标要求。

RESEARCH ON HIGH GRAVITY TECHNOLOGY FOR PURIFYING SOUR NATURAL GAS

Based on the static measurement results of H2S absorption capacities of MDEA and different ratio sterically hindered amine solutions, the desulfurization performance of MDEA and sterically hindered amine solution with optimized ratio for high sulfur natural gas was investigated in a high gravity desulfurization side-stream apparatus under the conditions of operation pressure of 8.3 MPa and different gas/liquid ratio. The influence of rotating speed of high gravity apparatus on the selective desulfurization was also studied. The results indicate that No.8 solvent exhibits the largest H2S absorption capacity. The absorption capacities of No.8 solvent at 40 ℃ and 50 ℃ are 79.67g/L and 59.20g/L, respectively. The high gravity desulfurization technology can reduce the H2S content from 2.0×105 mg/m3 in raw gas to less than 100 mg/m3 in purified natural gas. At the ratio of gas to liquid of 95, purified gas has the H2S contents of 19.8 mg/m3 and total sulfur contents of 32.27 mg/m3 and CO2 contents of 0.38%, which meets the second category natural gas quality standard.