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建立了福建无烟煤细颗粒燃烧模型,计算了其在容量35 t/h循环流化床锅炉炉膛内的燃尽时间和一次通过炉膛的停留时间,分析了不同粒径煤颗粒在不同燃烧温度和不同烟气流速时在CFB锅炉内的燃尽时间和停留时间的变化差异. 实验研究了福建无烟煤粒径对飞灰碳含量的影响及燃尽的影响. 结果表明,细煤颗粒的燃尽时间与停留时间均随粒径增大而增长,但燃尽时间增幅更明显,颗粒一次通过炉膛完全燃尽的临界粒径约为0.15 mm;粒径越大的颗粒其停留时间和燃尽时间对烟气流速和燃烧温度变化越敏感;无烟煤入炉粒径明显影响CFB锅炉飞灰含碳量,选用粒度为3~8 mm的偏粗颗粒为宜. 相似文献
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《煤炭加工与综合利用》2016,(7)
煤泥掺烧发电是煤泥综合利用的最重要方式;循环流化床锅炉燃烧技术与高压管道输送技术成功解决了工业化燃用煤泥过程面临的难题。通过分析CFB机组煤泥掺烧关键环节,及其掺烧煤泥对机组运行工况的影响,并且对比了多台机组煤泥掺烧前后的经济性差异,证实CFB机组掺烧煤泥技术可行,经济效益好。 相似文献
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《煤炭加工与综合利用》2016,(3)
介绍了国内煤泥综合利用方式、低热值煤电厂循环流化床(CFB)锅炉掺烧煤泥系统发展情况以及工艺系统的设置,实例分析了煤泥掺烧工艺的流程、布置形式、各类设备配置的优缺点及应用效果,指出了掺烧系统需要完善的问题。 相似文献
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阐述了煤泥干燥脱水与煤泥管道泵送2种煤泥处理技术的优缺点,对比分析2种工艺对煤泥燃烧发电的影响,得出煤泥干燥后与原煤掺混入炉燃烧的处理方式不适用于煤泥综合利用电厂,而煤泥管道泵送技术是发展煤泥燃烧发电的必要环节,且日趋向大容量循环流化床锅炉大比例掺烧煤泥方向发展。 相似文献
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煤粉炉和循环流化床锅炉飞灰特性对其汞吸附能力的影响 总被引:2,自引:0,他引:2
通过分析两台容量相近的循环流化床锅炉和煤粉锅炉飞灰样品的粒径分布、表面结构特性、未燃尽碳含量、反应性和汞含量,探究两种类型锅炉飞灰特性差异及其与飞灰汞吸附能力的关系。结果表明:循环流化床和煤粉锅炉尾端除尘设备排灰口飞灰汞的含量分别为1584.0 ng/g和503.7 ng/g,其原因与飞灰粒径、未燃尽碳含量和表面特性相关。对于循环流化床锅炉,飞灰中汞含量随其粒径和反应性温度的减小而增加,随未燃尽碳含量增加而增加,且与比表面积和吸附量呈正相关关系。对于煤粉锅炉,粒径为75~53 μm的飞灰对汞吸附能力较强,未燃尽碳含量明显小于循环流化床所产生飞灰的含量,飞灰比表面积随粒径变化不大,由此导致煤粉锅炉除尘设备排灰口所取样品对汞的吸附能力远低于循环流化床锅炉相对应位置飞灰对汞的吸附能力。 相似文献
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Reduction of unburned carbon fraction in exhaust during co-combustion of various coals in a circulating fluidized bed boiler
(CFB) is required to save energy loss and to optimize coal utilization as well as to improve the boiler efficiency. In this
study, the effects of operation variables such as coal, air and heat flow rates, co-combustion ratio of each coal, primary
to secondary air ratio on unburned carbon fraction were analyzed and evaluated in two units of 200 MWe circulating fluidized
bed boiler in the Tonghae thermal power plant. From the results, the comprehensive correlation among unburned carbon fraction
and operation variables in #1 and #2 units of the CFB boiler could be derived with a good agreement. This would be expected
to give a good guideline to reduce the unburned carbon content in exhaust in the CFB boiler. 相似文献
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采用微波消解法和氢化物发生-原子荧光光谱法考察了9台超低排放在役机组硒迁移转化规律,探究了循环流化床(CFB)和煤粉炉(PC)机组飞灰特性差异对硒吸附能力的影响。燃烧后煤中硒几乎全部呈现挥发态,底渣中残留量极低。与浓度归一化和质量分布法相比较,相对富集系数法可以客观地评价燃煤副产物中硒的富集能力,两类机组中硒均主要富集于飞灰中。CFB较低炉膛温度和添加CaO可以降低入炉煤中硒释放比例并增强飞灰对硒的吸附能力,故其底渣和飞灰中硒的富集程度均高于PC,导致脱硫石膏中硒富集程度低于PC。飞灰对硒的吸附量随比表面积或孔容积增大而增大,但随粒径或孔径增大而减小。CFB飞灰中未燃尽碳含量高、形状不规则、表面粗糙且存在较多蜂窝状孔隙,导致其对硒的富集程度高于PC飞灰。 相似文献
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Dong Won Kim Jong Min Lee Jae Sung Kim Jong Jin Kim 《Korean Journal of Chemical Engineering》2007,24(3):461-465
The co-combustion characteristics for Korean anthracites and bituminous coals were determined in a lab-scale CFB reactor and
the commercial scale Tonghae CFB Power Plant. In the lab-scale CFB combustion tests, the effluent rate of the emission gases,
which can indicate the reactivity of the combustion, did not change appreciably when each coal burned. As the bituminous coal
was added, however, the effluent rate of the emissions increased. The amount of the unburned carbon in ash decreased with
increasing the ratio of the bituminous coal during the co-combustion. When the co-combustion was tested in the Tonghae CFB
power plant, the temperatures at the upper part of the combustor and the cyclones, which were somewhat higher than designed
and expected, could be reduced as the bituminous coal ratio increased. Consequently, more stable operation of the CFB boiler
was achieved. The efficiency of the CFB boiler also increased due to increasing the reactivity of the combustion.
This work was presented at the 6
th
Korea-China Workshop on Clean Energy Technology held at Busan, Korea, July 4–7, 2006. 相似文献
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循环流化床锅炉的床温是循环流化床锅炉最重要的控制参数,它直接影响着整个锅炉的热效率和脱硫效率,从云天化股份有限责任公司的循环流化床锅炉的实际运行出发,分析了影响循环流化床锅炉床温的各种因素,其中主要因素有煤质、煤量、煤粒粒径、一次风、二次风、脱硫剂、循环灰量和床层高度等,据此选择出适合云天化循环流化床锅炉的床温,并利用返灰量来自动调节控制锅炉的床温。 相似文献