基于GB 17820-2018的天然气净化厂在线分析仪配置及应用

Configuration and application management of online analyzer in natural gas purification plant based on GB 17820-2018

关键词:  产品天然气  质量指标  在线分析仪  配置  应用管理

Key words:  product natural gas  quality index  on-line analyzer  configuration  application management

摘要:

为了实现GB 17820-2018《天然气》实施下的各天然气净化厂对产品天然气质量指标在线监测设备的合理配置和应用管理,通过对现有在线分析仪的配置现状和在线分析仪基于新标准的配置及应用管理要求进行分析研究,并结合产品天然气高位发热量、总硫含量、H₂S含量、CO₂含量、水露点这5个质量指标与天然气净化厂的关联度,提出相应的在线分析仪配置建议和应用管理改进措施,达到产品天然气质量指标监测在线分析仪的合理配置和使用目的。研究认为:①在各天然气净化厂产品天然气高位发热量、总硫含量、H₂S含量、CO₂含量及水露点这5个质量指标中,高位发热量、CO₂含量是易满足指标的,水露点次之,总硫含量、H₂S含量则是天然气净化装置操作、控制的重点和难点,在生产过程中极易出现超指标情况;②各天然气净化厂现配置的水分在线分析仪能满足GB 17820-2018中水露点监测的要求,可以继续使用；③现配置的硫化氢在线分析仪不能满足GB 17820-2018中H₂S含量的监测要求,需重新选型更换；④需要增加总硫在线分析仪；⑤CO₂在线分析仪配置保持现状；⑥发热量在线分析仪暂不考虑。 

Abstract:

With implementation of GB 17820-2018 Natural Gas, the purification plants under the Natural Gas Purification Plant General of Southwest Oil and Gasfield Company are faced with the requirement of class I gas index value for product natural gas. To achieve the requirement of new standard GB 17820-2018, the existing configuration of on-line monitoring equipment are analyzed by compared with the new standard. According to the correlation degree between the five quality index values(the calorific value, total sulfur content,hydrogen sulfide content, carbon dioxide content and water dew point) and the gas purification plant, the configuration suggestions and application management improvement measures of on-line analyzer are put forward in order to achieve the purpose of reasonable configuration and use of on-line analyzer for product quality index monitoring. The research results show that: (1) among the five quality indexes of natural gas high calorific value, total sulfur content, hydrogen sulfide content, carbon dioxide content and water dew point, in which high calorific value and carbon dioxide content are easy to meet the index value, but water dew point, total sulfur content and hydrogen sulfide content are the key and difficult points in the operation and control of natural gas purification plant, which is easy to exceed the index value in the production process；(2) the water on-line analyzer currently configured in each natural gas purification plant can meet the requirements of water dew point monitoring in GB 17820-2018 and continue to be used; (3) the hydrogen sulfide on-line analyzer currently configured can not meet the requirements of hydrogen sulfide content monitoring in GB 17820-2018 and needs to be reselected and replaced; (4) the quantity of total sulfur on-line analyzer needs to be added; (5) the configuration of carbon dioxide on-line analyzer remains the status quo; (6) the calorific value on-line analyzer is not available for the time being consider.