新型多通道煤粉燃烧器污染物产生量的研究

利用先进的CFD技术模拟了新型多通道煤粉燃烧器在窑内的燃烧情况,根据结果分析燃烧过程中污染物的排放情况,研究结论是:将4%～6%的一次风由旋风道12个孔喷出,剩余风量由12个直风道喷出,能减少一次风量降低能耗;设计旋风道偏转25°,提高旋风道喷出速度到160m/s,直风道速度到240m/s,使CO_2、CO、NO_x、SO_2生成在旋流区,同时达到减少排放的目的。     

Conversion of a commercial gasoline vehicle to run bi-fuel (hydrogen-gasoline)

Bi-fuel internal combustion engine vehicles allowing the operation with gasoline or diesel and hydrogen have great potential for speeding up the introduction of hydrogen in the transport sector. This would also contribute to alleviate the problem of urban air pollution. In this work, the modifications carried out to convert a Volkswagen Polo 1.4 into a bi-fuel (hydrogen-gasoline) car are described. Changes included the incorporation of a storage system based on compressed hydrogen, a machined intake manifold with a low-pressure accumulator where the hydrogen injectors were assembled, a new electronic control unit managing operation on hydrogen and an electrical junction box to control the change from a fuel to another. Change of fuel is very simple and does not require stopping the car. Road tests with hydrogen fuel gave a maximum speed of 125 km/h and an estimated consumption of 1 kg of hydrogen per 100 km at an average speed of 90 km/h. Vehicle conversion to bi-fuel operation is technically feasible and cheap.     

工业锅炉排污热能的利用

工业锅炉排污热能的重复利用是提高热效率和节能减排的重要技术措施。本文介绍了工业锅炉排污热能利用的具体做法。     

The pollutant discharge improvement by introducing HHO gas into biomass boiler

Biomass fuel has been widely concerned because its net CO₂ emission is close to zero. Biomass boilers are known to have lower pollutant emissions than fossil fuel boilers, but in some applications, they also release high-level CO and NO. We developed a medium-sized hydrogen and oxygen (HHO) generator, with high energy conversion rate and adjustable output gas. The HHO gas was then introduced into a biomass hot air generator for mixed combustion. The experimental results showed that based on the electricity consumption of gas production and biomass fuel price, the total cost during preheating reduced. In addition, the average concentrations of CO, NO and smoke decreased by 93.0%, 22.5% and 80%, respectively. Integration of biomass fuel and HHO gas can effectively reduce pollutant emissions and save fuel, especially in areas rich in renewable energy.     

MINIMISATION OF NOx EMISSION BY FLAME TEMPERATURE CONTROL

Emission control technology has advanced to an extent whereby pollutant levels are now controlled by legislation. Techniques for controlling emissions vary and include improved fuel mixture preparation, multi stage combustion, exhaust gas recirculation, inhibitors such as ammonia and other techniques which reduce the intensity of combustion and hence flame temperature.

This paper examines ways in which ultra low NO_x, emission combustors can be produced by applying technology developed for burning poor quality fuels.     

复合TiO_2光催化剂的制备及光催化性能研究进展

本文综述了近几年来复合TiO2光催化剂的发展现状。分别从分类、制备方法及光催化性能三方面进行系统论述。根据复合的物质不同,将复合TiO2光催化剂分为金属掺杂型、非金属掺杂型和半导体复合型。概述了溶胶-凝胶法、水热法、浸渍法等常用于复合TiO2光催化剂的制备方法以及复合TiO2光催化剂在降解水体有机污染物、分解水制氢、空气净化等方面的应用。     

基于排污成本累加的节能减排发电调度模型研究

随着全国节能减排政策的实施推广,传统的发电调度模式向节能环保的发电调度模式转变。结合节能发电调度办法和国家环境保护标准,提出了基于排污成本累加的节能减排发电调度模型。在结合传统经济发电调度模型的基础上,综合考虑了污染物排放水平、排放收费及其排放浓度约束,建立考虑了污染物排放因素的以全网供电煤耗最小和总发电成本最小的目标函数,并通过算例分析了新型发电调度模型的有效性。针对模型的适用范围和影响因素,提出了有益的建议。     

土壤中主要重金属污染物的迁移转化及治理

介绍了土壤中主要重金属污染物汞、镉、铅、铬、砷在土壤中的主要存在形式、来源、迁移及转化过程。对土壤中主要重金属污染物提出了治理方法。     

浅谈干燥设备系统的节能减排

解释节能减排方面的GDP能耗、能源效率、合同能源管理以及CDM等常用名词术语,介绍了换热器冷凝水回收,热风炉高效燃烧和热泵等节能措施与途径。     

深圳市部分市售禽类制品二噁英污染水平研究

目的了解深圳市部分市售禽类制品(鸡肉、鸭肉、鸡蛋、鸭蛋)中17种二噁英污染情况。方法于2004年12月至2008年10月期间,随机采集深圳市市售的26份禽类样品,参照美国国家环保局EPA1613方法,采用索式抽提装置和FMS自动纯化系统分别对样品进行提取和净化,采用同位素稀释技术,用高分辨气相色谱/高分辨双聚焦磁式质谱联用(HRGC/HRMS)的超痕量有机分析技术平台,对样品中的二噁英进行定量分析检测。结果禽肉中PCDD/Fs含量(pgWHO-TEQ/g脂肪)范围是0.03～1.61,平均含量为0.50;禽蛋中PCDD/Fs含量范围是0.22～5.66,平均含量为1.43。其中有1份鸡肉和1份鸡蛋中二噁英含量超过欧盟执行标准,含量分别为1.61和5.66。结论本次调查的禽类制品中二噁英平均含量低于欧洲标准,但个别样品存在二噁英污染现象。