燃煤电厂二氧化硫污染与治理

比较详细地阐述了我国燃煤电厂二氧化硫污染的现状、危害及治理进程。介绍了国内各种脱硫装置的运行情况。     

Stability of large-scale coal-fired MHD channels

Stability of large-scale coal-fired MHD channels is studied by (1) linearized stability analysis, and (2) time-dependent 1-D analysis. The channel length is 15 m with 600 electrode pairs, and the output power ranges from 220.6 MW through 258.7 MW. Linearized stability analyses show that the Faraday channels operated with fixed loading resistance are stable, whereas the two waves of u and u–a (u, a: gas and sound velocity) become unstable in the Faraday channel with fixed loading factor. Two waves of u and u–a are unstable in the diagonal channel with fixed loading current and the u + a wave becomes unstable in the diagonal channel with fixed electrode current. Time-dependent one-dimensional analyses indicate that the Faraday channels with fixed load resistance are smooth without growth of fluctuation. The diagonal channels with fixed electrode current are smooth with no fluctuation, though the linear theory indicates that the u + a wave is unstable. The diagonal channel with fixed load current suffers large disturbance along the latter half of the channel, being consistent with the linearized analysis which indicates that the u - a and u waves are unstable.     

200MW乏气送粉机组主蒸汽温度控制优化方案

本文在常规火电厂主蒸汽温度自动控制方案的基础上,对200MW乏气送粉机组的特性进行了分析,结合锅炉主要参数与主蒸汽温度自动控制的相互关系,以及相关的工艺要求,提出了一种新的优化方案。     

硫化床燃煤注汽锅炉上煤系统危险性评价与控制措施

硫化眯燃煤污水注汽锅炉（以下简称燃煤锅炉）在新疆油田稠油开采中首饮应用,锅炉运行所需的主要物料是大量细粒径煤,本文主要就燃煤的储存、输送系统及输送过程存在的危险有害因素进行分析,评估,主要应用作业条件的危险性评价和事故树等方法实施定性或半定量评价,提出相应控制措施,预防职业病和确保上煤系统安全稳定运行。     

大型燃煤电站粉煤灰的特性及综合利用

介绍了我国粉煤灰的综合利用现状,从大型燃煤电站情况出发,分析了粉煤灰的特性、影响因素,对我国当前的粉煤灰综合利用意义、发展前景加以探讨,并提出建议及措施,为同类型企业粉煤灰的综合利用提供参考.     

宝鸡燃煤电厂周围土壤中天然放射性水平调查研究

本文介绍了宝鸡燃煤电厂周围土壤中天然放射性核素226Ra、232Th和40K比活度的调查测量结果.在距电厂1 km、3 km处和距电厂＜1 km范围内各布设8个采样点,共24个采样点;在每个点上分0～25 cm(A层)和25～50 cm(B层)两层取样,共采集土壤样品48个.用NaI(Tl)低本底γ谱仪分析测量土样中的天然放射性核素.简要分析了距电厂不同距离和不同深度土壤样品中的226Ra、232Th和40K比活度水平,并将24个A层土壤样品中226Ra、232Th和40K比活度平均值与陕西省和其他一些省、市、地区的土壤调查测量结果作了比较.对燃煤电厂周围土壤中天然放射性核素比活度分布特点进行了初步分析,结果表明,226Ra的平均比活度A层高于B层,在距电厂1 km处232Th和40K的平均比活度B层高于A层.     

大型燃煤电站锅炉若干重大问题的原因分析和改进措施

针对大型燃煤电站锅炉存在的炉瞠结渣、高温腐蚀、过热器及再热器超温爆管、再热汽温调节技术、受热面磨损和烟尘排放问题进行了原因分析,并介绍了相应的改进措施。     

Atmospheric emissions estimation of Hg, As, and Se from coal-fired power plants in China, 2007

Over half of coal in China is burned directly by power plants, becoming an important source of hazardous trace element emissions, such as mercury (Hg), arsenic (As), and selenium (Se), etc. Based on coal consumption by each power plant, emission factors classified by different boiler patterns and air pollution control devices configuration, atmospheric emissions of Hg, As, and Se from coal-fired power plants in China are evaluated. The national total emissions of Hg, As, and Se from coal-fired power plants in 2007 are calculated at 132 t, 550 t, and 787 t, respectively. Furthermore, according to the percentage of coal consumed by units equipped with different types of PM devices and FGD systems, speciation of mercury is estimated as follows: 80.48 t of Hg, 49.98 t of Hg²⁺, and 1.89 t of Hg^P, representing 60.81%, 37.76%, and 1.43% of the totals, respectively. The emissions of Hg, As, and Se in China's eastern and central provinces are much higher than those in the west, except for provinces involved in the program of electricity transmission from west to east China, such as Sichuan, Guizhou, Yunnan, Shaanxi, etc.     

Mercury wet deposition and coal-fired power station contributions: An Australian study

Regions that have large coal-fired power station regions may be prone to elevated mercury (Hg) deposition fluxes. Total mercury (THg) in daily rainfall samples at a near-field sampling site (Hunter Valley) and a far-field station (Sydney) has been monitored in this study employing ultra-clean sampling techniques and Cold Vapour Atomic Fluorescence Spectrometry (CVAFS) analysis.     

火电机组辅助汽水系统定量分析的通用模型

以质量单元为基础，通过严谨的数学推演，提出了火电机组辅助汽水系统定量分析计算的通用模型，该模型全面考虑了辅助汽水系统组成特点，具有分析与计算方便、简洁、准确性高、通用性强等特点：不仅为编制通用的热力系统计算软件提供了依据，而且为火电机组的节能降耗，特别是辅助汽水系统的定量分析计算提供了新的理论基础，并通过实例进行了验证。