新型干法水泥窑协同处置村镇生活垃圾的研究

发布时间：2018-04-19 05:32

本文选题：村镇 + 生活垃圾　；参考：《广西大学》2015年硕士论文

【摘要】：在对广西全区村镇生活垃圾和水泥熟料生产线分布调研的基础上,提出利用新型干法水泥窑协同处置村镇生活垃圾的新模式。本研究以4500 t/d新型干法水泥窑生产线为依托,对生活垃圾简单预处理之后,由上料设备喂入三次风管末端,被三次风带入分解炉中彻底焚烧；监测和探讨了在水泥窑系统中定量掺烧20、50和80t/d生活垃圾过程中对水泥窑工况参数及产量,水泥熟料质量和污染物排放情况的影响。主要研究成果如下：(1)村镇生活垃圾的含水量大,热值低。垃圾灰分含硅量最高,其次是钙、铁、铝,与煤灰的化学成分相似。(2)水泥窑掺烧80t/d范围内的村镇生活垃圾可降低单位水泥熟料的热耗,且不影响水泥熟料的产量。当掺烧量为80t/d时,与未掺烧生活垃圾的热耗相比降低了10%。(3)掺烧一定量的生活垃圾会引起水泥窑系统的瞬时温度和负压波动增大,特别是掺烧生活垃圾的量为50t/d时影响较大,但喂料稳定后瞬时温度与负压又恢复正常,生产工况的各参数波动仍处于可控范围之内；同时对水泥窑系统各监测点的平均温度和负压几乎无影响,且未显示出对窑内衬材料造成结皮的危害。(4)水泥窑掺烧生活垃圾后生产的水泥熟料的石灰石饱和系数(KH)略为降低,硅率(SM)和铝率(IM)变化不大。生活垃圾的掺烧可能导致水泥28 d强度的略为降低,但仍符合国家现行标准通用硅酸盐水泥中P·I42.5水泥的要求。(5)采用ICP-MS分别对生活垃圾灰分和水泥熟料中14种重金属含量进行了检测。生活垃圾中含量最多的为铬、锰、镍、铅,在水泥窑内强氧化环境和碱性气氛等条件下经高温煅烧后,最终大部分重金属被固定到水泥熟料当中。(6)掺烧80t/d范围内的村镇生活垃圾不会增加水泥窑窑尾排放烟气中NOX、SO2和颗粒物的含量。烟气颗粒物中可挥发性重金属含量会随生活垃圾掺烧量的增大而增加,而难挥发性重金属在颗粒物中的含量很低,且均符合国家现行标准。(7)生活垃圾掺烧量为80t/d时,水泥窑系统窑尾烟气中二嗯英的浓度经检测为0.0040 ng TEQ/Nm3,远远低于国家现行标准的0.100 ngTEQ/Nm3。
[Abstract]:On the basis of the investigation and investigation on the distribution of village and town domestic refuse and cement clinker production line in Guangxi, a new mode of cooperative disposal of village and town domestic refuse by using new dry cement kiln is put forward.Based on the 4500 t / d new dry cement kiln production line, after the simple pretreatment of domestic waste, the feeding equipment was fed into the end of the third air pipe, and was thoroughly burned in the calciner by the third air.The effects of mixing 2050 and 80t/d in cement kiln system on the operating parameters and output of cement kiln, the quality of cement clinker and the discharge of pollutants were investigated.The main research results are as follows: 1) the water content and calorific value of MSW are high and low.The content of silicon in ash is the highest, followed by calcium, iron and aluminum, similar to the chemical composition of coal ash. The cement kiln mixed with 80t/d can reduce the heat consumption of cement clinker and does not affect the output of cement clinker.When 80t/d is added, the heat consumption of MSW is reduced by 10% than that of MSW without mixing.) mixing of MSW with a certain amount of MSW will cause the fluctuation of instantaneous temperature and negative pressure of cement kiln system to increase, especially when the amount of MSW is 50t/d.However, the instantaneous temperature and negative pressure return to normal after the feed is stabilized, and the fluctuation of the parameters of the production condition is still within the controllable range, and the average temperature and negative pressure of the cement kiln system monitoring points are almost no influence.The limestone saturation coefficient (KH) of cement clinker produced by mixing MSW in cement kiln decreased slightly, but the silicon content (SMV) and aluminum content (IMM) did not change much.The mixing of MSW may lead to a slight decrease of cement strength in 28 d.The ash content of MSW and 14 kinds of heavy metals in cement clinker were detected by ICP-MS.The contents of chromium, manganese, nickel and lead are the most in domestic refuse. After calcined under the condition of strong oxidation environment and alkaline atmosphere in cement kiln,In the end, most of the heavy metals were immobilized in cement clinker. 6) the content of NOX so 2 and particulate matter in flue gas of cement kiln kiln was not increased by burning the MSW in the range of 80t/d.The content of volatile heavy metals in particulate matter of flue gas will increase with the increase of the amount of MSW, but the content of hard volatile heavy metals in particulate matter is very low, and both meet the current national standard. 7) when the amount of MSW mixed with MSW is 80t/d, the content of volatile heavy metals in particulate matter is very low.The concentration of Erin in the flue gas of cement kiln system was detected to be 0.0040 ng TEQ / Nm3, which is far lower than the current national standard of 0.100 ng TEQ / Nm3.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X799.3;TQ172.6

【参考文献】