The development of pollution control technology in coal combustion in China

The recent development of coal combustion pollution control technologies in China, including desulphurization, denitrification, particulate matters and heavy metals emission control technologies, have been reviewed. The development histories and the advantages of China’s self-developed technologies have been introduced in detail. The key points of future research and development in coal combustion pollution control, e.g., combined emission control and CO₂ emission control technologies, have also been discussed.     

Life cycle emissions of greenhouse gas for ammonia scrubbing technology

It is thought that the CO₂ emissions from coal-fired power plants contribute greatly to the total anthropogenic CO₂ emissions. Ammonia solvent can be used to absorb the CO₂, called ammonia scrubbing. However, as has been pointed out, the production of ammonia would emit CO₂; therefore, the effectiveness of ammonia scrubbing is doubted. The paper focuses on the problem. Two systems are defined in the paper. System I is CO₂ absorption by ammonia scrubbing, and system II is industrial production of ammonium bicarbonate. The total CO₂ emissions of the two systems are calculated by means of life cycle assessment. The paper shows that the total CO₂ emissions of ammonia scrubbing are less than that of the industrial production of fertilizer ammonium bicarbonate. It can be concluded that ammonia scrubbing is an effective way to reduce the anthropogenic CO₂ emissions. This work was presented at the 6 ^th Korea-China Workshop on Clean Energy Technology held at Busan, Korea, July 4–7, 2006.     

一种带斩波的双采样Σ-Δ调制器

设计了一种适用于过高磁场抗扰度的电容式隔离型全差分Σ-Δ调制器。它采用单环2阶1位量化的前馈积分器结构,运用斩波技术降低低频噪声和直流失调。与传统的全差分结构相比,该调制器的每级积分器均采用4个采样电容,在一个时钟周期内能实现两次采样与积分,所需的外部时钟频率仅为传统积分器的一半,降低了运放的压摆率及单位增益带宽的设计要求,实现了低功耗。基于CSMC 0.35 μm CMOS工艺,在5 V电源电压、10 MHz采样频率和256过采样率的条件下进行电路仿真。后仿真结果表明,调制器的SNDR为100.7 dB,THD为－104.9 dB,ENOB可达16.78位,总功耗仅为0.4 mA。     

不确定环境下定期分红股票贷款定价研究

基于不确定理论,根据定期分红股票模型,建立定期分红股票贷款定价方程,给出股票贷款价值的计算方法;根据2017年的金融数据进行实证研究,得出股票持有者应该进行股票贷款的结论。     

回转窑煤粉燃烧器推力的分析和计算

燃烧器将煤粉喷射到窑内燃烧,只有火焰形状合理,才能满足窑内的温度分布符合物料在各段进行反应所需要的温度。要获得合理的火焰形状,就必须有足够的能量支撑。目前,国内外对这种能量的表示方法基本上有三种:一是能量表示法或称"动能表示法",二是单位热量推力表示法,三是相对推力表示法,以最后一种最直观,最简便。煤粉燃烧器的推力,不管用什么方法表达,只是具体数值不同,而其实质是相同的。燃烧器的推力不宜过大,关键在够用。     

符合性质量评价方法在打叶复烤质量评价中的应用

针对目前打叶复烤行业质量评价方法的不足,运用正态分布理论,提出了符合性质量评价方法。应用效果表明,符合性质量评价方法能够对打叶复烤质量进行有效的深度评价,克服了传统的合格率评价方法的不足,解决了在打叶复烤中加工指标不一致时的连续性质量分析问题。     

MPC8306和SM502在智能充电桩控制系统中的应用

针对现有充电桩人机界面不够友好、功能不够强大等不足,本文提出了一种新的智能充电桩控制系统。本系统采用最新一代的高性能工业级PowerPC MPC8306作为CPU,并配以SM502驱动7英寸真彩色液晶显示和全尺寸触摸屏,同时还包括主充电部分、计费部分、刷卡部分等。     

回转窑煤粉燃烧器的发展趋势、特点及选择(一)

当前回转窑煤粉燃烧器的发展趋势是:由三风道向四风道发展;由分割式向旋流式发展;由烧优质烟煤向烧低质煤和废燃料发展;在大中型生产线上,由引进向国产发展.四风道煤粉燃烧器的特点:一次风用量小,节能显著;风速高,推力大;调节灵活,火焰形状可以多变;火焰形状好,没有峰值温度;外风从间断出口喷出,永不变形.四风道煤粉燃烧器为低质煤的运用提供了技术支持.一些四风道煤粉燃烧器头部件易烧损磨蚀,下煤处易磨漏磨穿,中间容易弯曲,浇注料寿命短,企业在选用时必须重视,对国内外燃烧器要正确评认,应认真落实性价比.在燃烧器的采购中应搞清楚有关煤粉燃烧器名词术语的基本概念,还要了解国内外煤粉燃烧器市场状况,做到准确地采购.     

PASSIM卷接机组供丝落料器网板清理装置设计

针对PASSIM卷接机组供丝落料器网板存在的烟丝堵塞的问题,通过在落料器网板的上方增加一套清理装置,以及箱体的一侧增加活门,彻底解决了网板的堵丝现象,保证了机组的正常运行。     

电炉CSP工艺开发无取向硅钢热带钢的技术可行性探讨

介绍了无取向硅钢产业的市场前景，并根据电炉CSP工艺状况，结合用户使用硅钢的成分和性能，提出了开发无取向硅钢的初步工艺方案和一些探讨性意见。