高钙煤灰增湿脱硫试验研究

该文以热天平和半工业性热态试验系统对高钙煤灰增湿脱硫过程进行了研究。试验研究结果表明：自由水分是高钙煤灰低温固硫反应的首要条件，而雾化液滴粒径、停留时间和Ca/S比等因素对煤灰增湿脱硫工艺的脱硫效果有着直接的影响。在实际烟气条件下，该工艺脱硫效率为40％－50％，能够达到燃用神木煤的锅炉环保标准。     

炉内喷钙加尾部烟气增湿活化脱硫工艺

炉内喷钙加尾部烟气增湿活化脱硫工艺是在炉内喷钙脱硫工艺的基础上在锅炉尾部增设了增湿段，以提高脱硫效果。     

高钙粉煤灰直接应用于烟气脱硫的试验研究

在一维热态煤粉炉上进行了粉煤灰干法、尾部增湿以及灰浆湿法烟气脱硫试验.结果表明,利用高钙粉煤灰组织炉内或尾部烟气的脱硫都能取得一定的效果.研究发现:干法脱硫效果是粉煤灰对SO2的物理吸附和化学反应吸收两个过程共同作用的结果;在增湿和湿法脱硫中,自由水分的存在是提高脱硫率的关键因素,而湿法中钙硫比对脱硫的影响占据主导地位.试验结果表明:干法脱硫效果最差;增湿脱硫效果明显提升,灰浆脱硫效果最优,当钙硫比为0.864～1.86时,脱硫率为53%～78%,达到了中等脱硫效果,具有工程应用前景.     

高钙煤灰颗粒与液滴碰撞增湿脱硫过程的模型研究

为模拟增湿活化反应器内高钙煤灰颗粒的增湿脱硫过程，采用随机轨道模型分别跟踪颗粒群与液滴群，以相邻单元间26条颗粒流通道模型统计未增湿条件下的初始颗粒流量，以液滴群的空间单元捕捉效率为单元体内颗粒流量守恒方程的源项(汇)系数，来迭代各单元通道上的未增湿颗粒流量，耦合煤灰颗粒与液滴群的碰撞过程。并进一步考虑反应器内气、液、固多相湍流物理化学反应过程，建立了三维场内高钙煤灰低温增湿脱硫总体模型，初步预测了高钙煤灰增湿脱硫过程，模型预测与试验结果具有很好的吻合特性。图10参9。     

增湿活化脱硫试验研究

在热态脱硫试验台上进行了喷水活化和蒸汽活化脱硫试验,并研究了在不同钙硫比,饱和温距、SO2浓度和烟气速度下的脱硫性能,研究表明,与单纯的吸收剂喷射技术相比,蒸汽增湿活化和喷水增湿活化,都可以提高脱硫效率,但喷水活化效果比蒸汽活化效果好得多,而且脱硫效率随钙硫比增加,饱和温距、SO2浓度及烟气速度的降低而升高;在喷水增湿活脱硫中,脱硫剂浆滴的脱硫作用远远大于脱硫剂吸温脱硫作用。     

炉内喷钙活化增湿脱硫的影响因素

文章介绍了下关电厂炉的喷钙活化器增脱硫的工艺,分析了炉内喷钙活化器增湿脱硫的影响因素,指出了该脱硫技术具有广阔的应用前景。     

喷钙脱硫成套技术

介绍炉内喷钙──炉后喷水增湿烟气脱硫成套技术以及国内研究开发的集除水滴、固硫和除尘于一体的湿颗粒层过饱和增湿高效脱硫除尘技术。     

干式烟气脱硫技术进展及其应用前景分析

对国内外有广泛应用前景的几种干式烟气脱硫技术进行了介绍,分析了这些脱硫技术的特点,并针对上海地区电厂燃用高钙低硫煤的实际情况,提出了采用高钙粉煤灰增湿活化脱硫的简易脱硫方法。     

钙基固硫剂水合活性分析

基于ＣａＯ水合放热,设计专用试验装置对生石灰水合活性进行测试比较,其结果对炉内喷钙增湿水合烟气脱硫和以生石灰为吸着剂的简易湿法脱硫技术吸着剂选择有指导意义。     

LIFAC系统对锅炉运行性能的影响

分析炉内喷钙尾部增湿活化 (LIFAC)烟气脱硫技术对锅炉燃烧 ,传热 ,炉膛结渣 ,高温腐蚀 ,磨损     

Investigation on the mechanism of coal desulfurization by ultrasonic with peroxyacetic acid

This investigation reports the exploration of the mechanism for coal desulfurization utilizing ultrasonic (US) with peroxyacetic acid. Changes in surface and pore diameter for coal samples were determined before and after US treatment. To study its chemical effect, production regularities of hydroxyl radical under US field was analyzed by the iodine release method. Experimental results showed that the specific surface area, total pore volume and average pore size of treated samples were improved compared to untreated coal. In addition, the production rule of hydroxyl radical was consistent with that of desulfurization rate. XPS analysis results indicated that the removals of pyrite, mercaptan, and sulfur ether from coal were more than 60%, while thiophene, sulfoxide and sulfone were difficult to remove from coal. The further oxidation of sulfur-containing groups in coal was obtained due to the physical and chemical effects of the ultrasonic. These findings confirmed that the synergistic action of physical and chemical effects of the US played an important role in this desulfurization process, which could serve as a reference for further optimizing the coal desulfurization process.     

Ultrasonic and Microwave Desulfurization of Coal in Tetrachloroethylene

Abstract

The extractive desulfurization of four high sulfur coals from China were promoted with ultrasonic and microwave in tetrachloroethylene organic solvents. It was shown that the joint promotion with ultrasonic and microwave had an active effect on extractive desulfurization. The rate of desulfurization increased with the increase of time in ultrasonic field as well as with the power of ultrasonic, but declined with the increase of the particle size of coal. The rate of desulfurization was not identical for different coal, which was perhaps related to the existed forms of organic sulfur in coal.     

Effect of Prussian Blue on Organic Sulfur of Coal in Aqueous Medium

Abstract

This study is an attempt to desulfurize organic sulfur from coal samples with ferric hexacyanoferrate (II), Fe₄ [Fe(CN)₆], as the desulfurization agent. Effect of temperature, particle size and concentration of ferrocyanide ion on desulfurization from the coal samples has been investigated. The temperature and stirring time are the most important parameters for the level of desulfurization of organic sulfur. Removal of organic sulfur content increased continuously with increasing temperature from 298 to 368 K. The organic sulfur removal rate sharply increases from 10 min to 30 min stirring time. After 30 min, it reaches a value of plateau. Particle size between ?100 mesh and ?200 mesh slightly affects the amount of organic sulfur removal. Gradual increase in the concentration of ferric hexacyanoferrate (II) raised the magnitude of desulfurization, but at higher concentration, the variation is not significant.     

高硫煤脱硫技术及展望

高硫煤的直接燃烧会产生严重的环境污染,为此需要开发有效的高硫煤脱硫技术。介绍了我国高硫煤中硫的赋存状态和分布规律,分析了目前高硫煤脱硫的物理方法、化学方法和生物方法及目前各种脱硫方法存在的关键问题,最后对高硫煤脱硫技术的发展方向进行了阐述。     

水煤浆与煤粉燃烧脱硫比较

以煤代油是能源工业的发展方向。作为新型代油燃料,水煤浆有广阔的应用前景。从硫析出特点、脱硫影响因素（温度、Ｃａ／Ｓ比）以及烟尘排放等方面,研究了水煤浆燃烧脱硫与煤粉燃烧脱硫的异同。试验结果表明水煤浆燃烧脱硫优于煤粉,是值得推广的脱硫技术。     

Experimental research on two-stage desulfurization technology in traveling grate boilers

In order to promote the desulfurization efficiency of calcium-based sorbents during coal combustion in traveling grate boilers, the influences on sulfur removal of the thermal conditions and the sorbents were discussed in this paper. It was found that the SO₂ concentration first rises, then declines along the traveling grate and reaches the peak near the midpoint of the grate. The fluctuation of the SO₂ concentration over time in the flue gas is mainly affected by the flame temperature. When the particle size of the sorbents decreases from 75 to 0.1 μm, the sulfur removal efficiency will increase slightly. A reasonable Ca/S molar ratio is about 2 when sorbents are blended with the coal on the grate and its further increase has little benefit to desulfurization. A new, so-called two-stage desulfurization process — sulfur capture firstly in the coal bed and secondly in the combustion gas — is suggested as it can greatly promote the sulfur removal efficiency up to 70∼80%. By X-ray powder diffraction analysis, some thermal stable phases were identified in the sulfur retention cinder obtained from the on-grate process.     

高温燃烧两段脱硫技术的试验研究

针对链条炉内钙基添加剂燃烧脱硫率低的难题,研究了链条炉床温和烟气成分的动态变化,在研究添加剂粒径、添加量和添加方式对各种钙基添加剂脱硫率影响的基础上,提出了两段燃烧脱硫技术的解决方案,以实现煤层内和燃烧室间同时脱硫的目的,从时间和空间两个方面克服了 简单与入炉散煤预混或炉内直接喷钙脱硫方式的根本缺陷,使链条炉燃烧胶硫效率提高了70%～80%。图3表4参7     

硫在煤中的存在形式及其随煤粒径的分布

介绍了我国煤中硫的含量分布及硫的存在形式，并研究了含硫量随粒径的分布规律，这有利于研究和选择原煤脱硫方法。     

Oxidative Desulfurization of Tufanbeyli Coal by Hydrogen Peroxide Solution

Abstract

It is becoming popular to use fossil fuels efficiently since the necessary energy is mostly supplied from fossil fuels. Altough there are high lignite reservoirs, high sulfur content limits the efficient use of them. In this article, we aimed to convert combustible sulfur in coal to non-combustible sulfate form in the ash by oxidizing it with a hydrogen peroxide solution. The parameters affecting the sulfur conversion were determined to be: hydrogen peroxide concentration, reaction time, mean particle size at constant room temperature and shaking rate. The maximum desulfurization efficiency reached was 74% of the original combustible sulfur with 15% (w/w) hydrogen peroxide solution, 12 hours of reaction time, and 0.25 mm mean particle size.