污泥常温干化及其影响因素
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摘要
通过改变相对湿度、环境温度和空气流速3个环境因素,对不同比表面积的城镇脱水污泥进行干化。结果表明:随着污泥比表面积增大,干化时间显著缩短,缩短幅度为11. 5%～38. 5%。相对湿度、环境温度和空气流速对常温干化影响程度大小顺序为相对湿度>空气流速>环境温度。污泥常温干化主要分为第1升速阶段、第2升速阶段和降速阶段,第2升速阶段在总干化时长中最短,但单位时间水分蒸发量最高。污泥干化接近结束时,环境条件对降低含水率影响不大,对干化时间影响较大。常温干化过程应以控制环境相对湿度为主,在不同阶段适当提高空气流速和环境温度有利于缩短干化时间,降低能耗。污泥常温干化对设备保温要求低,干化耗能小,干化条件在自然状态下极易达到,利于后续处置及资源化利用。
The dewatered minicipal sewage sludge with different specific surface area was dried by changing three environmental factors of relative humidity,ambient temperature and air velocity. Results indicated that with the increase of the specific surface area,the drying time was shortened at a range of 11. 5% to 38. 5%. The impact degree of environmental factors on drying at room temperature in descending order was as follow: environmental relative humidity,air velocity and ambient temperature. Sludge drying at room temperature could be divided into the first acceleration stage,the second acceleration stage and the deceleration stage. Though the second acceleration phase was the shortest,its evaporation rate was the highest. The environmental factors had little effect on decreasing moisture content but greatly influenced the drying time when the experiment ended. Environmental relative humidity should mainly be controlled during sludge drying at room temperature with air flow rate and ambient temperature increased properly at different stages,which was beneficial to shorten drying time and reduce energy consumption. Sludge drying at room temperature has low demand for thermal insulation of equipment and consumes less energy.The working condition requirements are easily met under natural conditions,which is conducive to subsequent disposal and resource utilization,so it is easy for wide application.
The dewatered minicipal sewage sludge with different specific surface area was dried by changing three environmental factors of relative humidity,ambient temperature and air velocity. Results indicated that with the increase of the specific surface area,the drying time was shortened at a range of 11. 5% to 38. 5%. The impact degree of environmental factors on drying at room temperature in descending order was as follow: environmental relative humidity,air velocity and ambient temperature. Sludge drying at room temperature could be divided into the first acceleration stage,the second acceleration stage and the deceleration stage. Though the second acceleration phase was the shortest,its evaporation rate was the highest. The environmental factors had little effect on decreasing moisture content but greatly influenced the drying time when the experiment ended. Environmental relative humidity should mainly be controlled during sludge drying at room temperature with air flow rate and ambient temperature increased properly at different stages,which was beneficial to shorten drying time and reduce energy consumption. Sludge drying at room temperature has low demand for thermal insulation of equipment and consumes less energy.The working condition requirements are easily met under natural conditions,which is conducive to subsequent disposal and resource utilization,so it is easy for wide application.
引文
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[16]李润东,张万里,孙洋,等.污泥热干化技术适应性分析及未来发展趋势[J].可再生能源,2012(5):95-99.
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[18]陈彤,詹明秀,林晓青,等.特定污泥干化过程中二噁英抑制气体排放特性[J].浙江大学学报(工学版),2015(2):322-329.
[19]翁焕新,章金骏,刘瓉,等.污泥干化过程氨的释放与控制[J].中国环境科学,2011,(7):1171-1177.
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[25]李爱民,曲艳丽,杨子贤,等.污水污泥干燥过程中表观形态变化及水分析出特性[J].化工学报,2004,55(6):1011-1015.
[26]范科飞,王景阳,廖传华.含湿多孔介质的干燥特性[J].干燥技术与设备,2006,4(2):77-80.
[27]吴中华,吴龙,李占勇,等.城市污泥等温热风对流干燥过程的能耗分析[J].中国给水排水,2013,29(15):89-93.
[28]王娟,潘峰,肖朝伦,等.市政污泥的燃料资源化利用[J].过程工程学报,2011,11(5):800-805.
[29]曲艳丽,李爱民,李润东,等.饼状污泥干燥特性的研究[J].燃烧科学与技术,2005,11(1):96-99.
[2] Fytili D, Zabaniotou A. Utilization of sewage sludge in EU application of old and new methods:a review[J]. Renewable&Sustainable Energy Reviews,2008,12(1):116-140.
[3]徐佳媚,黄瑛,姚一思,等.南京市污泥深度脱水-干化-焚烧处置规划研究[J].环境工程,2015,33(增刊1):515-519.
[4]刘永付,王飞,池涌,等.太阳能蒸汽辅助污泥干化的试验研究[J].中国给水排水,2013,29(17):35-39.
[5]王高敏,吴青荣,姚斌,等.污泥干燥动力学的研究进展[J].环境工程,2016,34(10):124-127.
[6]程诚,黄亚继,袁琦,等.污泥干燥特性及其模型求解[J].环境工程,2013,31(增刊1):585-589.
[7]李辉,吴晓芙,蒋龙波,等.城市污泥脱水干化技术进展[J].环境工程,2014,32(11):102-107.
[8]郑龙,伍健东,周兴求,等.温度和相对湿度对污泥低温干燥速率的影响[J].环境工程学报,2016,10(2):922-928.
[9]李斌斌,范海宏,任洋明,等.城市污泥薄层干燥特性及动力学研究[J].环境工程,2016,34(10):103-107.
[10]曾庆洋,伍健东,周兴求,等.污泥厚度和风速对污泥常温干燥的影响及干燥模型分析[J].科学技术与工程,2017(12):55-61.
[11]吴青荣,张绪坤,王高敏.城市污泥低温干化技术研究进展[J].环境工程,2017,35(3):127-131.
[12]王兴润,金宜英,聂永丰.国内外污泥热干燥工艺的应用进展及技术要点[J].中国给水排水,2007,23(8):5-8.
[13]姚金玲,王海燕,于云江.基于污染物变化选择干化污泥处置技术[J].环境工程,2010,28(6):71-75.
[14]曾庆洋.污泥常温干燥特性及能耗分析[D].广州:华南理工大学,2017.
[15]李辉,吴晓芙,蒋龙波,等.城市污泥脱水干化技术进展[J].环境工程,2014,32(11):102-107.
[16]李润东,张万里,孙洋,等.污泥热干化技术适应性分析及未来发展趋势[J].可再生能源,2012(5):95-99.
[17]王刚.国内外污泥处理处置技术现状与发展趋势[J].环境工程,2013,31(增刊1):530-533.
[18]陈彤,詹明秀,林晓青,等.特定污泥干化过程中二噁英抑制气体排放特性[J].浙江大学学报(工学版),2015(2):322-329.
[19]翁焕新,章金骏,刘瓉,等.污泥干化过程氨的释放与控制[J].中国环境科学,2011,(7):1171-1177.
[20]刘长燕,葛仕福.污泥干燥特性及其模型[J].化工装备技术,2010,(1):1-4.
[21]孙文鸽,吴长春,吴志根.基于地域性的三种污泥干化工艺的经济性比较[J].环境工程,2016,34(6):150-154.
[22]国家环境保护总局. GB 18918—2002城镇污水处理厂污染物排放标准[S]. 2002.
[23]煤炭科学研究总院煤炭分析实验室. GB/T 213—2008煤的发热量测定方法[S]. 2008.
[24]邹惠芬,费颖超,赵雷,等.污泥生物干化机理的探讨[J].沈阳建筑大学学报(自然科学版),2013,29(1):132-137.
[25]李爱民,曲艳丽,杨子贤,等.污水污泥干燥过程中表观形态变化及水分析出特性[J].化工学报,2004,55(6):1011-1015.
[26]范科飞,王景阳,廖传华.含湿多孔介质的干燥特性[J].干燥技术与设备,2006,4(2):77-80.
[27]吴中华,吴龙,李占勇,等.城市污泥等温热风对流干燥过程的能耗分析[J].中国给水排水,2013,29(15):89-93.
[28]王娟,潘峰,肖朝伦,等.市政污泥的燃料资源化利用[J].过程工程学报,2011,11(5):800-805.
[29]曲艳丽,李爱民,李润东,等.饼状污泥干燥特性的研究[J].燃烧科学与技术,2005,11(1):96-99.