| 摘要: |
| 目的 针对中国目前车用压缩天然气（CNG）产品标准与相关标准不协调的问题,提出相对科学合理的质量指标，以促进CNG产业的高质量发展。方法 综合国内CNG气质现状和国内外CNG质量指标，确定GB 18047《车用压缩天然气》质量指标及在各个阶段的优化修订情况，并与国际上CNG质量指标进行对标分析。结果 当前CNG质量指标不能体现天然气清洁属性，且作为商品，CNG质量等级未进行分类，不利于公平公正的市场贸易发展。结论 从使用安全、环保、经济适应性和促进产业发展的视角提出了CNG质量指标建议：①根据高位发热量、总硫含量、H2S含量和氧气含量将CNG分为一类气和二类气；②增加一类气，建议其质量指标为：高位发热量34.0 MJ/m3、总硫质量浓度20 mg/m3、H2S质量浓度6 mg/m3、氧气体积分数0.1%；③保留GB 18047—2017质量指标作为二类气质量指标，保障特殊气源作为CNG利用；④水露点指标修改为“在汽车驾驶的特定地理区域内，在操作压力和环境温度低于–13 ℃的条件下，车用CNG中不应有液态水析出”。 |
| 关键词: CNG 天然气 质量指标 高位发热量 硫 水露点 |
| DOI：10.3969/j.issn.1007-3426.2024.06.018 |
| 分类号: |
| 基金项目:中国石油西南油气田公司科学研究与技术开发项目“天然气中H2S、CO2和C4H8S新型检测管法准确检测机理及设备研究”（2024D108-01-06） |
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| Study on quality index of compressed natural gas as vehicle fuel |
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ZHU Huadong1,2,3, ZHOU Li1,2,3, LIU Jintao1,2,3, CHEN Zhenghua1,2,3
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1.Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan, China;2.Key Laboratory of Natural Gas Quality Control and Energy Measurement, State Administration for Market Regulation, Chengdu, Sichuan, China;3.Key Laboratory of Natural Gas Quality Control and Energy Measurement, CNPC, Chengdu, Sichuan, China
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| Abstract: |
| Objective To address the inconsistency of CNG national standards to other related standards at present, relatively scientific and reasonable quality indexes are proposed to promote the high-quality development of the CNG industry. Methods Based on CNG quality status in China, domestic and foreign CNG standards, and CNG quality indexes, the determination of GB 18047 Compressed natural gas as vehicle fuel quality indexes and the optimization and revision in each stage were analyzed, and the international CNG quality indexes were compared. Results With the rapid development of the national natural gas industry and the improvement of environmental protection requirements, the current CNG quality indexes could not reflect the clean attribute of natural gas, and the CNG quality level as a commodity was not classified, which was not conducive to the development of fair and equitable market trade. Conclusions This paper proposes CNG quality indexes recommendations from the perspectives of safety, environmental protection, economic adaptability, and promoting industrial development, which are listed as follows: Firstly, CNG is classified into Class I and Class II based on its gross calorific value, total sulfur, H2S content, and oxygen content. Secondly, gross calorific value of 34.0 MJ/m3, total sulfur content of 20 mg/m3, hydrogen sulfide content of 6 mg/m3, and the oxygen content of 0.1 vol% are added as technical indexes of Class I gas. Thirdly, indexes of GB 18047—2017 are kept for Class II gas to ensure the use of special gas sources to produce CNG. Fourthly, The water dew point index is modified to "in the specific geographical area of the car driving, under the conditions of operating pressure and ambient temperature below -13 ℃, there should be no liquid water precipitation in the compressed natural gas as vehicle fuel". |
| Key words: CNG natural gas quality indexes gross calorific value sulfur water dew point |
