共查询到20条相似文献,搜索用时 281 毫秒
1.
城市下水污泥和煤/LPG在循环流化床上的混烧试验研究 总被引:2,自引:0,他引:2
在高6000 mm、直径300mm的循环流化床上进行了含水率为79%的湿污泥与煤/石油液化气(LPG)的混烧试验。试验结果表明:无论用煤还是LPG作为辅助燃料,试验都能在设定的工况条件下稳定运行;向炉内加入石灰石的量达到钙硫摩尔比为3.4∶1时,二氧化硫和氯化氢的排放达标,脱硫效率和脱氯效率分别为75%和94%;在试验中, 烟气中NOx排放、烟气中汞含量和二恶英类排放都不超标;试验产生的飞灰含碳量低,飞灰中痕量元素的浸出毒性不超标;计算表明,如果利用余热干燥污泥和预热空气可有效地减少辅助燃料的消耗量。 相似文献
2.
3.
流化床垃圾焚烧炉飞灰中二噁英的分布 总被引:3,自引:0,他引:3
对某热电厂150吨/天垃圾和煤混烧焚烧炉百叶窗分离器收集的飞灰进行筛分和二噁英含量测定。灰样中>100μm的颗粒占到了86%以上。随粒径减小,二噁英总量浓度增大,且粒径<37μm飞灰的二噁英浓度最高。二噁英的毒性当量I-TEQ值在100μm的左右两侧均随粒径增大而降低。大于 100μm的颗粒是构成原始飞灰样品二噁英总量和I-TEQ值的主要部分。呋喃氯代物是飞灰中主要的二噁英,PCDDs/PCDFs比值小于1。本文还分析了影响飞灰中二噁英生成的其它因素。 相似文献
4.
5.
6.
7.
城市干化污泥循环流化床燃烧过程中NO和N2O的排放特性 总被引:1,自引:0,他引:1
在15 kW循环流化床实验台上进行了城市干化污泥的燃烧实验,研究了污泥含水率、燃烧温度、过量空气系数、二次风比率等因素对NO和N2O排放特性的影响。实验结果表明:污泥含水率从4.5%增加至17.5%时,NO排放浓度明显降低,N2O排放浓度明显升高;燃烧温度升高,NO排放浓度呈上升趋势,N2O排放浓度则呈下降趋势;增大过量空气系数会促进NO和N2O的生成;提高二次风比率可以降低NO和N2O的排放浓度。城市干化污泥在循环流化床燃烧过程中NO和N2O的排放浓度高于污泥与煤混烧时的排放浓度,但燃料N向NO和N2O的转化率低于与煤混烧过程。 相似文献
8.
含湿量对甲烷湿空气自热重整积碳特性的影响 总被引:1,自引:0,他引:1
微动力装置中碳氢燃料催化燃烧被认为是有效的方法,但燃烧室内燃料催化重整普遍存在由积碳导致的催化剂失活等问题.本文采用数值方法研究了微细腔中甲烷湿空气在镍基催化剂上的自热重整反应,重点分析含湿量对甲烷自热重整反应及积碳特性的影响.结果表明:含湿量将增强甲烷重整反应;自热反应散热量和表面积碳浓度均随含湿量增加而降低.混合物... 相似文献
9.
O2/CO2循环燃烧中NOx的中试实验研究 总被引:2,自引:0,他引:2
O2/CO2 循环燃烧技术不仅便于回收烟气中 CO2,还能大幅度减少 SO2 和 NOx 排放.在国内第一台中试规模O2/CO2 循环燃烧台架上,对炉膛内部不同燃烧区域和尾部烟气的 NOx 排放进行研究.结果表明,本实验台架燃烧一段是 NOx 排放的重点提升区,Air 气氛下 NOx 浓度上升了 109.7%,在 O2/CO2 和 O2/RFG 气氛下 NOx 浓度没有明显增加,分别上升 23.2% 和 21.6%,燃烧二段 NOx 浓度基本没发生变化.尾部烟气中,与 Air 工况相比,O2/CO2 循环燃烧工况下脱硝率为 83.41%,另外喷钙对 NOx 的脱除也有不同程度的提升. 相似文献
10.
11.
城市生活垃圾流化床焚烧时PCDD/Fs排放特性的研究 总被引:7,自引:0,他引:7
城市生活垃圾焚烧处理已逐渐在我国推广应用.垃圾焚烧所产生的二恶英污染问题日益被人们所关注,浙江大学基于我国城市生活垃圾的特点(高水份、多组份、低热值等),成功开发了异重流化床焚烧技术并应用于一座 150 t/d垃圾流化床焚烧锅炉.木文首先介绍了二恶英的分析方法,其次在小型流化床上进行了PCDD/Fs的生成机理试验、在此基础上,对150t/d垃圾焚烧炉烟气中二恶英排放进行了分析,实验结果将指导焚烧炉优化运行并为进一步研究打下坚实基础。 相似文献
12.
13.
14.
Xiaolong Li Yueming Wang Thomas Allgurén Klas Andersson Jost O.L. Wendt 《Proceedings of the Combustion Institute》2021,38(3):4309-4316
The focus of this paper is on effects of chlorine and sulfur on coal ash deposition rates, under practically relevant but systematically controlled combustion conditions. This problem is important, not so much for coal, but to understand and predict deposition rates for biomass combustion where chlorine contents can be high. To this end, ash deposition rates on a controlled temperature surface were measured for controlled amounts of chlorine and sulfur added to a pulverized coal, doped with potassium and burned in a 100 kW rated combustion rig. Previous work with 35 tests on 11 coal, biomass and petroleum coke fuels burned under a range of operating conditions had strongly suggested that the deposition rate of the tightly bound inside deposits was independent of the ash aerosol composition, and depended only on PM1 in the flue gas. The loosely bound outside deposition rate was dependent primarily on the total alkali content in the flue gas. The new results using chlorine added to the fuel (in the form of ammonium chloride) required these previous conclusions to be drastically revised. They showed that chlorine, not alkali alone, had large effects on the deposition rate of the inside deposits, which now were orders of magnitude higher than without chlorine addition, and did not fit previous (multi-fuel) correlations with PM1. Sulfur addition, together with chlorine, did not affect deposition rates much, although it did lower the chlorine content of the deposit. These results are interpreted in terms of the ash aerosol size segregated composition, which was also measured, and potential sulfation reactions within the deposit. 相似文献
15.
16.
17.
18.
H. Schürmann P.B. Monkhouse S. Unterberger K.R.G. Hein 《Proceedings of the Combustion Institute》2007,31(2):1913-1920
This work concerns a parametric study of alkali release in a lab-scale, pulverized coal combustor (drop tube reactor) at atmospheric pressure. Measurements were made at steady reactor conditions using excimer laser fragmentation fluorescence (ELIF) and with direct optical access to the flue gas pipe. In this way, absolute gas-phase alkali species could be determined in situ, continuously, with sub-ppb sensitivity, directly in the flue gas. A hard coal was fired in the range 1000–1300 °C, for residence times in the range 3–5 s and for air numbers λ (air/fuel ratios) from 1.15 to 1.50. In addition, the amount of chlorine, water vapor and sulfur, respectively, was increased in known amounts by controlled dosing of HCl, H2O and SO2 into the combustion gas to determine effects of these components on release or capture of the alkali species. The experimental results are also compared with values calculated using ash/fuel analyses and sequential extraction to obtain a fuller picture of alkali release in pulverized fuel combustion. 相似文献
19.
20.
高温空气低燃气浓度燃烧过程的数值模拟研究 总被引:2,自引:1,他引:1
从工程实际出发,本文提出了高温空气低燃气浓度燃烧新技术,即充分利用烟气余热提高助燃空气温度,提高热能利用率;同时通过优化喷口结构,提高燃气射流速度,使燃气射流在同空气射流混合燃烧前卷吸大量炉内烟气,从而降低燃气射流中的可燃物浓度,进而降低氮氧化物的排放。通过数值模拟研究表明,通过燃气射流速度从24.56m/s提高到55.26m/s,可以降低NOx的排放;当围绕燃气喷口的六个圆形空气喷口改为两个矩形喷口时,燃气射流可从两侧卷吸更多的炉内烟气,形成低燃气浓度燃烧,从而大大降低了NOx的排放。 相似文献