谈页岩气的脱水脱烃工艺

为加快适应近年来国内页岩气开发的迅猛步伐,针对页岩气藏分布偏远,现场依托条件差、对建设周期要求高等特点,提出了适用于含重烃的页岩气的净化处理方案-J-T阀脱水脱烃工艺,该工艺设备少,操作容易、控制简单,可同时控制水、烃露点;对关键设备选型、关键参数选取几方面进行了对比、优化和创新。为缩短建设周期,降低工程投资,装置布置采用模块化布置,可实现工厂预制化,易于搬迁再利用。对含重烃页岩气的净化处理起一定借鉴和参考作用。     

冷藏陈列柜空气预冷器设计

冷藏陈列柜中蒸发器结霜会使蒸发器换热性能恶化,空气阻力增加,进而使整个制冷系统性能下降.采用蒸发器分级,增加过热器作为空气预冷器等措施对原有的冷藏陈列柜进行了改造.实验结果表明,系统改进后,风幕的封闭能力大大提高,延长了融霜周期,从而降低了陈列柜的能耗.     

减湿预冷器对冷藏陈列柜风幕送回风状态的影响分析

以双风幕立式敞开式冷藏陈列柜为研究对象,研究减湿预冷器对冷藏陈列柜风幕送回风状态的影响。实验结果表明:在测试环境温度为25℃,相对湿度为60%条件下,冷藏陈列柜使用减湿预冷器后风幕送风温度没有明显变化,回风温度降低5℃;内层风幕的送风相对湿度和回风相对湿度变化不大,外层风幕的送风相对湿度由69%下降至60%;外层风幕的送风焓值基本保持不变,而回风焓值降低21.4%。回风温度和回风焓值的降低都可以有效降低陈列柜负荷。     

Improved condenser design and condenser-fan operation for air-cooled chillers

Air-cooled chillers traditionally operate under head pressure control via staging constant-speed condenser fans. This causes a significant drop in their coefficient of performance (COP) at part load or low outdoor temperatures. This paper describes how the COP of these chillers can be improved by a new condenser design, using evaporative pre-coolers and variable-speed fans. A thermodynamic model for an air-cooled screw-chiller was developed, within which the condenser component considers empirical equations showing the effectiveness of an evaporative pre-cooler in lowering the outdoor temperature in the heat-rejection process. The condenser component also contains an algorithm to determine the number and speed of the condenser fans staged at any given set point of condensing temperature. It is found that the chiller’s COP can be maximized by adjusting the set point based on any given chiller load and wet-bulb temperature of the outdoor air. A 5.6–113.4% increase in chiller COP can be achieved from the new condenser design and condenser fan operation. This provides important insights into how to develop more energy-efficient air-cooled chillers.     

直接空冷机组背压异常上升问题分析及处理

针对某350 MW超临界直接空冷机组背压异常上升、抽真空管道温度始终偏低问题,详细阐述了事件现象与经过,分析了背压异常上升的原因,确定为真空泵前置冷却器疏水不畅水位高导致,及时采取相应措施后背压恢复正常,对此类问题提出了相应建议与预防措施.