| 摘要: |
| 目的 目前国内天然气提氦虽能降低能耗，但仍存在氦气产品纯度低、设备众多、流程复杂等问题。为此，开发一种高效低耗的联产工艺，提升产品纯度并简化流程。方法 提出了一种单塔加两级分离器配合混合冷剂制冷的联产工艺，通过深冷塔和分离器实现了氦气的逐级提纯，并利用支持向量机（SVM）配合改进海鸥算法（ISOA）实现了工艺关键参数和指标的优化。结果 该工艺只有氦气和LNG两种产品，整个流程形成闭环控制，氦气产品纯度（以摩尔分数计）可超80%，优于文献报道；总能耗与所有关键参数相关，LNG液化率与深冷塔的参数设置有关，氦气收率和氦气产品纯度与深冷塔和两级分离器的参数设置有关；ISOA-SVM模型在总能耗、LNG液化率、氦气收率和氦气产品纯度预测结果上的相对误差分别为0.54%、0.98%、0.63%和0.69%，优于其余对比模型，具有较强的泛化能力和鲁棒性；优化后总能耗可在现有基础上降低16.21%，氦气收率可达97.06%，氦气产品纯度可达85.09%。结论 该工艺通过低温精馏即可得到高收率高纯度的氦气，工艺综合性能优势明显。 |
| 关键词: 天然气 提氦 LNG 联产 氦气收率 氦气产品纯度 |
| DOI：10.3969/j.issn.1007-3426.2025.03.008 |
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| Design and analysis of the co-production liquefaction process for extracting helium from natural gas |
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PEI Xiangbing1, FENG Guangfei2, ZHANG Tan1, FENG Jianqiu1, JIANG Ke1, DENG Baokang3
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1.PetroChina CBM Company Limited, Beijing, China;2.Sinopec East China Oil & Gas Company, Nanjing, Jiangsu, China;3.Sichuan OGT Oilfield Technology Development Co., Ltd., Chengdu, Sichuan, China
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| Abstract: |
| Objective Although the current domestic helium extraction from natural gas can reduce energy consumption, it still faces problems such as low purity of helium products, numerous equipment and complex processes. To solve these problems, an efficient and low-consumption co-production process is developed to improve product purity and simplify the process. Method A co-production process with a single tower and a two-stage separator combined with mixed refrigerant refrigeration was proposed. Helium was enriched step by step by cryogenic tower and separator. Support vector machine (SVM) and improved seagull optimization algorithm (ISOA) were used to optimize the key parameters of the process and the product indexes. Result There were only helium and LNG products in the process, and the whole process formed a closed-loop control. The purity of helium products could exceed 80 mol%, which was better than other literature reports. The total energy consumption was related to all key parameters, the LNG liquefaction rate was related to the parameter setting of the cryogenic tower, and the helium yield and helium product purity were related to the parameter setting of the cryogenic tower and the two-stage separator. The relative errors of the ISOA-SVM model in the prediction results of total energy consumption, LNG liquefaction rate, helium yield and helium product purity are 0.54 mol%, 0.98 mol%, 0.63 mol% and 0.69 mol%, respectively, which was superior to other comparison models, and had strong generalization ability and robustness. After optimization, the total energy consumption could be reduced by 16.21%, the helium yield could reach 97.06%, and the purity of helium products could reach 85.09%. Conclusion Helium with high yield and purity can be obtained by low temperature rectification, and the comprehensive performance of the process has obvious advantages. |
| Key words: natural gas helium extraction LNG co-production helium yield helium product purity |
