空分设备冷箱鼓胀变形的发生和预防

空分设备冷箱漏液,必须扒砂。介绍了扒砂过程中发生的冷箱鼓胀变形事故,分析了事故的原因和今后的防范措施,提出了安全扒砂的建议。     

信息系统中基于角色的访问控制

在一个企业级信息系统中,用户访问信息系统中资源的管理是一个复杂问题,直接对用户授权的管理模式不能适应企业的发展。文中讨论了基于角色的访问控制管理方式和ORACLE数据库管理系统的安全性策略,分析了信息系统中访问控制管理的需求,提出了对信息系统应用功能访问和数据库访问的分开控制管理,通过应用系统角色建立数据库用户和应用系统功能之间的关联,从而构成信息系统的访问控制管理策略。给出了基于角色的访问控制实现,并应用于设备信息管理系统中,实现了用户访问控制动态管理。     

空分装置利用LNG冷量的热力学分析

简介了LNG冷量用于空分装置的实际例子及其节能效果 ;从空分装置液化率改变和压力改变两方面对利用LNG冷量的空分装置进行了热力学分析 ;最后指出 ,空分装置利用LNG冷量可达到多产液体、节省投资和运行费用的效果。     

变压吸附在气体分离单元的应用

简述了变压吸附在气体分离单元操作的原理,并介绍了变压吸附装置的分类情况,指出变压吸附技术的发展趋势:研发新型吸附剂和工艺流程;加强硬件整改,如采用多塔流程及密相装填技术、研制高密封的程控阀门。     

空分压缩机组安全完整性技术等级(SIL)技术评估应用及分析

依据相关IEC和API标准,对空分装置三大机组(蒸汽透平、空压机和增压机)的安全联锁系统(SIS)做了安全完整性等级(SIL)技术评估,确定了空分三大机组安全联锁系统中的安全联锁功能(SIF),给出了各安全联锁功能(SIF)所需达到的安全完整性等级(SIL),提出并分析了空分三大机组安全联锁系统中存在的多个典型问题,最后针对问题分别给出了相应的改进建议。研究结果对空分装置三大机组和类似机组的安全、稳定、长周期运行有借鉴意义。     

Modeling and simulation of an oxy-fuel combustion boiler system with flue gas recirculation

In this paper, a mathematical model of an oxy-fuel combustion boiler system with flue gas recirculation is investigated. The reduction of CO₂ emission from coal-fired power plants is an important research issue in alleviating the global warming. The entire dynamics are decomposed in two main parts; fire-side dynamics and water-side dynamics. The fire-side dynamics consist of the mass and energy balance equations in the furnace (combustion process) and the flue gas dynamics represented by the mass balance equations of five gases (O₂, CO₂, SO₂, H₂O and NO₂). The water-side dynamics include a drum pressure equation and a steam temperature equation. To validate the developed models, the real experimental data in Karakas, Koumanakos, et al. (2007) are used. To investigate the local behavior near an operating point, a linearization method at its steady-state condition is pursued. The time responses of the entire dynamics using step inputs (the oxygen mass flow rate, the coal mass flow rate, the primary air mass flow rate, etc.) are also discussed.     

应用大气污染估算模式分析解决空分装置CO2污染

通过借鉴环境影响评价方法,应用大气污染估算模式对不同排放方式下CO2落地浓度进行计算及对比分析,确认空分装置CO2污染源,找出低成本消除污染的方法。     

I/A Series系统在空分装置中的应用

空分装置采用性能优良、可靠性高的I/A Series系统实现了数据采集、工艺控制、状态流程显示、趋势记录、报警等功能。该系统运行稳定,保证了空分装置的正常运行。     

空分透平冷箱高含氧事件的探讨与分析

介绍了某空分项目中遇到的一起低温透平冷箱高含氧事件问题,分析了氧气泄漏的可能性,并用泄漏检查确定了漏点,解释了高含氧的原因,最后对预防冷箱内法兰连接出现泄漏提出了建议。     

High-efficiency power production from natural gas with carbon capture

A unique electricity generation process uses natural gas and solid oxide fuel cells at high electrical efficiency (74%HHV) and zero atmospheric emissions. The process contains a steam reformer heat-integrated with the fuel cells to provide the heat necessary for reforming. The fuel cells are powered with H₂ and avoid carbon deposition issues. 100% CO₂ capture is achieved downstream of the fuel cells with very little energy penalty using a multi-stage flash cascade process, where high-purity water is produced as a side product. Alternative reforming techniques such as CO₂ reforming, autothermal reforming, and partial oxidation are considered. The capital and energy costs of the proposed process are considered to determine the levelized cost of electricity, which is low when compared to other similar carbon capture-enabled processes.