Pathways of China's PM2.5 air quality 2015–2060 in the context of carbon neutrality

Clean air policies in China have substantially reduced particulate matter (PM_2.5) air pollution in recent years, primarily by curbing end-of-pipe emissions. However, reaching the level of the World Health Organization (WHO) guidelines may instead depend upon the air quality co-benefits of ambitious climate action. Here, we assess pathways of Chinese PM_2.5 air quality from 2015 to 2060 under a combination of scenarios that link global and Chinese climate mitigation pathways (i.e. global 2°C- and 1.5°C-pathways, National Determined Contributions (NDC) pledges and carbon neutrality goals) to local clean air policies. We find that China can achieve both its near-term climate goals (peak emissions) and PM_2.5 air quality annual standard (35 μg/m³) by 2030 by fulfilling its NDC pledges and continuing air pollution control policies. However, the benefits of end-of-pipe control reductions are mostly exhausted by 2030, and reducing PM_2.5 exposure of the majority of the Chinese population to below 10 μg/m³ by 2060 will likely require more ambitious climate mitigation efforts such as China''s carbon neutrality goals and global 1.5°C-pathways. Our results thus highlight that China''s carbon neutrality goals will play a critical role in reducing air pollution exposure to the level of the WHO guidelines and protecting public health.     

常村矿N3-3掘进工作面通风风量计算及局扇选型

为了保障井下工作面作业人员的身体健康和劳动安全,对常村矿N3—3掘进工作面风量分别按瓦斯涌出量、工作面人数、风速、局部通风机供风量及最小全压进行了计算,确定了工作面采用两台功率为45Kw的FBDN07．2型通风杌,并安设合适的局扇管理牌板．出风口距工作面不大于12m,风筒出风口必须上风筒圈,从而保证掘进巷道通风系统的正常运行,以达到安全生产的目的。     

火电厂补给水系统水锤模拟计算研究

简要介绍了水锤计算的理论依据,采用计算机软件模拟火力发电厂补给水系统停泵水锤瞬态过程,重点对采用液控碟阀和空气阀作为事故停泵水利过渡过程防护的可能性进行了分析与论证．研究结果表明,合理设置液控碟阀关闭规律,结合系统合理设置空气阀的措施,能很好地避免水柱分离的发生．     

多功能小型中央空调实验装置的研制

目前市面上的中央空调实验装置功能单一,仅能演示单一的空气调节类型,与实际教学内容及要求有一定的差距。为此研制的多功能小型中央空调实验装置整合了3种空气调节的方式,符合高职院校制冷实训的内容及需求。使学生对空气-水系统（风机盘管装置）,风管式系统及辅助的冷冻水系统、冷却水系统,有一认识和动手的机会,并可观察故障现象,分析故障原因,解决故障。     

缓和湿式空气氧化技术在炼油碱渣处理中的应用

炼油碱渣是石油炼制碱精制过程中排出的含有大量有毒有害污染物的碱性废液,是炼油厂主要恶臭污染源。介绍了缓和湿式空气氧化技术处理炼油碱渣的工艺原理、工艺流程和对污染物的去除效果,并对工业应用过程中存在问题进行了分析,提出了相应的改进措施,以确保装置的平稳运行。结果表明：该工艺技术先进可靠,污染物去除率效果好,为后续处理创造了良好条件。     

基于Simulink的中央空调系统建模与仿真

随着我国经济的逐步增长,居住条件日益改善,人们对生活环境舒适度的要求越来越高,对中央空调的需求越来越大,对它的舒适、节能、健康更加重视。因此,设计一项舒适、节能、健康的中央空调工程是很有实际意义的。本文主要是利用MATLAB软件中的Simulink对在某一特定的空间内所设计的空调系统进行建模与仿真。     

Computational fluid dynamics simulation of formaldehyde emission characteristics and its experimental validation in environment chamber

We investigated the effect of supply air rate and temperature on formaldehyde emission characteristics in an environment chamber. A three-dimensional computational fluid dynamics （CFD） chamber model for simulating formaldehyde emission in twelve different cases was developed for obtaining formaldehyde concentration by the area-weighted average method. Laboratory experiments were conducted in an environment chamber to validate the simulation results of twelve different cases and the formaldehyde concentration was measured by continuous sampling. The results show that there was good agreement between the model prediction and the experimental values within 4.3% difference for each case. The CFD simulation results varied in the range from 0.21 mg/m3 to 0.94 mg/m3, and the measuring results in the range from 0.17 mg/m3 to 0.87 mg/m3. The variation trend of formaldehyde concentration with supply air rate and temperature variation for CFD simulation and experiment measuring was consistent. With the existence of steady formaldehyde emission sources, formaldehyde concentration generally increased with the increase of temperature, and it decreased with the increase of air supply rate. We also provided some reasonable suggestions to reduce formaldehyde concentration and to improve indoor air quality for newly decorated rooms.     

以五环高速公路构建武汉城市圈水陆空交通一体化

以＂船舶方向盘＂平面图形构建武汉城市圈五环高速公路路径迫在眉捷,因为武汉城市圈在武汉市区现在已有两个环圈形高速公路已投入运营,所以借此设计武汉城市圈第三环、第四环和第五环高速公路形成五个包围圈,根据会计文化＂强本节用＂的原则,依据＂船舶方向盘＂构造原理,将黄冈市、鄂州市、咸宁市和孝感市四个卫星城市设计在第三环高速公路环圈上,将黄石市和仙桃市两个卫星城市设计在第四环高速公路环圈上,将潜江市和天门市两个卫星城市设计在第五环高速公路环圈上,形成以武汉市为半径的经济圈与经济带。     

移动源对空气污染指数贡献的经济学分析——以大连市为例

从经济学的角度分析了空气污染移动源对空气质量的影响,通过建立自回归线性模型,得到机动车拥有量与空气污染指数的数量关系,明确了机动车尾气排放控制是改善城市环境质量的必要条件,提出了空气污染移动源排放规制的建议。     

某大型商业办公建筑夏季室内空气品质的调查与分析

为了研究中国湖南省大型商业办公建筑室内空气品质环境现状及其改善对策,选取湖南省长沙市某大型商业办公建筑为研究对象,对此建筑在2008年7月的室内空气品质状况进行了调研.采用问卷调查和现场测试的方法收集数据,并基于这些数据对12个房间的室内空气品质进行客观和主观评价.结果表明,这些房间室内空气品质的主要参数基本满足客观评价的标准,但大部分房间的CO2平均浓度未能达到清洁标准规定值1255mg/m^3.这些房间室内空气品质的平均接受率为71%,低于ASHRAE55—1992标准规定值（80%）.适当地提高空气流速、增加新风量可以很好地改善室内空气品质的主、客观评价.