兰炭燃烧特性及其在660MW机组上的大比例掺烧试验研究

华电技术 ›› 2020, Vol. 42 ›› Issue (7): 35-41.

兰炭燃烧特性及其在660MW机组上的大比例掺烧试验研究

1.西安热工研究院有限公司，西安 710054；2.陕西煤业化工集团有限责任公司，西安 710049；3.宁夏京能宁东发电有限责任公司，银川 750400；4.山西中电神头第二发电有限责任公司，山西朔州，036011

出版日期:2020-07-24 发布日期:2020-07-24

Combustion characteristics of semi-coke and its large-proportion co-combustion experimental research in a 660 MW unit

1.Xi´an Thermal Power Research Institute Company Limited，Xi´an 710054，China；2.Shaanxi Coal and Chemical Industry Group Company Limited，Xi´an 710049，China；3.Ningxia Jingneng Ningdong Electric Power Company Limited，Yinchuan 750400，China；4.Shanxi Zhongdian Shentou No.2 Electric Power Company Limited，Shuozhou 036011，China

Online:2020-07-24 Published:2020-07-24

摘要/Abstract

摘要： 利用一维火焰炉和煤粉气流着火炉对兰炭及其混煤开展试验研究，检测结果表明：兰炭具有干燥无灰基挥发分较低、收到基低位发热量高、灰熔点低、冲刷磨损指数高等特点；兰炭的着火温度为 710 ℃、燃尽率为 97.41%、结渣指数为0.84，属于难着火、易燃尽、严重结渣燃料，着火和燃尽性能介于烟煤和贫煤之间，结渣性能则明显强于典型贫煤和无烟煤。掺混兰炭会对不同煤种的着火、燃尽、结渣性能产生影响，现场掺烧试验表明，660 MW烟煤机组安全稳定掺烧兰炭的比例上限为50%左右，锅炉效率略有增加，飞灰中碳的质量分数增加0.3百分点，SO2质量浓度降幅达56%，NOx质量浓度小幅升高15%，而磨煤机出力降低15%~20%。

关键词: 兰炭, 着火温度, 燃尽率, 结渣特性, 660 MW机组, 大比例掺烧, 50%

Abstract: Based on the experimental research made on semi-coke and its blends with other coals by a one-dimensional flame furnace and a pulverized coal-air mixture flow furnace，semi-coke was proved to be of low volatile content on dry ashfree base，high net calorific value as received basis，low ash melting point，high impingement abrasion index，etc.The testing results showed that semi-coke´s ignition temperature was 710 ℃ ，and the burn-out rate was 97.41%；and the slagging index was 0.84，which indicated that semi-coke was a kind of fuel which was difficult to ignite，and easy to burnout and slag. The ignition and burn-out performances of semi-coke were between that of bituminous coal and lean coal， while its slagging performance was significantly stronger than that of conventional lean coal and anthracite.Dosing semicoke into the blends of different types of coal exerted effects on their ignition，burn-out and slagging characteristics. The cocombustion experiment made on a 660 MW bituminous coal boiler showed that 50%；is the upper limit of semi-coke ratio in the blend for the safe and stable operation of the boiler.Meanwhile，the boiler efficiency slightly increased and the content of unburned carbon in fly ash increased by 0.3 percent point，and the mass concentration of SO2 reduced by 56%，while the he mass concentration of NOx increased by 15%，and the output of coal mill decreased by 15%~20%.

Key words: semi-coke, ignition temperature, burn-out rate, slagging characteristic, 660 MW unit, large-proportion cocombustion, 50%

王志超1，王莹燕2，李彦军3，谭恺3，蒋华4，赵晓鹏3，冯平安2，姚伟1*. 兰炭燃烧特性及其在660MW机组上的大比例掺烧试验研究[J]. 华电技术, 2020, 42(7): 35-41.

WANG Zhichao1，WANG Yingyan2，LI Yanjun3，TAN Kai3，JIANG Hua4，ZHAO Xiaopeng3，FENG Ping′an2，YAO Wei1*. Combustion characteristics of semi-coke and its large-proportion co-combustion experimental research in a 660 MW unit[J]. Huadian Technology, 2020, 42(7): 35-41.

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