污泥湿式氧化工艺过程模拟及经济性分析
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摘要
基于前期实验结果,利用过程模拟软件搭建湿式氧化的基础模型,为方案设计提供参考。选取污泥含水率、热值和进气含氧量为变化因素,对自热条件下反应器可回收热量和系统压力进行模拟计算。结果表明,进气为纯氧时,实验压力下,维持自热的含水率最高为87. 6%;当考虑污泥泵的实际能力时,含水率最高可为89. 1%;干基热值范围在11～16 MJ/kg的污泥适用于此基础模型;随氧浓度增大,系统所需压力减小。针对某污水厂的污泥,对20 t/d污泥湿式氧化处理方案和对应的综合模型进行了介绍,并验证了模型的可用性。模拟结果与实验对比,发现气相产物无SO_2、NO_x;能量分析表明系统可自热维持。经济性分析结果表明,20 t/d系统的总投资约918万元,运行成本约134. 8元/t。
Based on the results of previous experiments,the basic model of wet oxidation is built by means of process simulation software,which provides a reference for the design of the scheme. The moisture content of sludge,calorific value and oxygen content of intake are selected as variable factors,and the recoverable heat and system pressure of the reactor are simulated under self-heating maintenance conditions.The results show that maximum moisture content to remain self-heating is 87. 6% under experimental pressure when the intake is pure oxygen.When considering the actual capacity of sludge pump,the moisture content can be up to 89. 1%.The sludge with a dry-based calorific value between 11 and 16 MJ·kg~(-1) are suitable for this system. As oxygen concentration increases,the pressure required by the system decreases. In view of sludge in a certain sewage plant,the wet oxidation treatment scheme and corresponding comprehensive model for 20 t·d~(-1) sludge are introduced,and the usability of the model is verified. Compared with the experiment results,it is found that there is no SO_x and NO_x in gas products either.Energy analysis shows that the system can be maintained by self-heating.Economic analysis shows that the total investment of the 20 t·d~(-1) system is about RMB9. 18 million and the operating cost is about RMB 134. 8/t.
Based on the results of previous experiments,the basic model of wet oxidation is built by means of process simulation software,which provides a reference for the design of the scheme. The moisture content of sludge,calorific value and oxygen content of intake are selected as variable factors,and the recoverable heat and system pressure of the reactor are simulated under self-heating maintenance conditions.The results show that maximum moisture content to remain self-heating is 87. 6% under experimental pressure when the intake is pure oxygen.When considering the actual capacity of sludge pump,the moisture content can be up to 89. 1%.The sludge with a dry-based calorific value between 11 and 16 MJ·kg~(-1) are suitable for this system. As oxygen concentration increases,the pressure required by the system decreases. In view of sludge in a certain sewage plant,the wet oxidation treatment scheme and corresponding comprehensive model for 20 t·d~(-1) sludge are introduced,and the usability of the model is verified. Compared with the experiment results,it is found that there is no SO_x and NO_x in gas products either.Energy analysis shows that the system can be maintained by self-heating.Economic analysis shows that the total investment of the 20 t·d~(-1) system is about RMB9. 18 million and the operating cost is about RMB 134. 8/t.
引文
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[2]周芊慧.城市污泥处置技术探析[J].环境科学:科技风.DOI:10.19392/j.cnki.1671-7341.201801104.
[3]庄修政,黄艳琴,阴秀丽,等.污泥水热处理制备清洁燃料的研究进展[J].化工进展,2018,37(1):311-318.
[4]Hii K,Baroutian S,Parthasrathy R,et al.A review of wet air oxidation and Thermal Hydrolysis technologies in sludge treatment[J].Bioresource Technology,2014,155:289-299.
[5]Garrido-Baserba M,Molinos-Senante M,Abelleira-Pereira J M.Selecting sewage sludge treatment alternatives in modern wastewater treatment plants using environmental decision support systems[J].Journal of Cleaner Production,2015,107:410-419.
[6]国家发展改革委,住房城乡建部.“十三五”全国城镇污水处理及再利用设施建设规划[EB/OL].[2016-12-31].http://www.ndrc.gov.cn/zcfb/zcfbghwb/201701/t20170122-836133.html.
[7]中国环境网.污泥减量化处置迫在眉睫[EB/OL].[2017-03-14].http://www.cenews.com.cn/qy/201703/t20170314-824696.html.
[8]雄飞,陈玲,王华,等.湿式氧化技术及其应用比较[J].环境污染治理技术与设,2003,4(5):66-69.
[9]宋新南,徐惠斌,房仁军,等.基于Aspen Plus的生物质燃烧NOx生成模拟[J].环境科学学报,2009,29(8):1696-1700.
[10]袁言言,黄瑛,张冬,等.污泥焚烧能量利用与污染物排放特性研究[J].动力工程学报,2016,36(11):934-940.
[11]霍小华.基于Aspen Plus平台的污泥富氧气化模拟[J].山西电力,2014,(1):48-50.
[12]赵晓,王青,程乐明.基于Aspen Plus的超临界水氧化污泥处理工艺建模[J].计算机与应用化学,2017,34(12):973-978.
[13]李维成,覃小刚,房慧,等.污泥湿式氧化试验研究及经济性分析[J].动力工程学报,2018,38(1):69-73.
[14]姜壮.新建污水处理厂投资估算[D].阜新:辽宁工程技术大学,2012.
[15]中华人民共和国建设部,标准定额研究所.市政工程投资估算编制办法(建标[2007]164号)[S].北京:中国计划出版社,2007.
[16]陈祥,徐福银,包兵,等.污泥处理产物和产品园林利用的分析[J].给水排水,2017,43(6):41-44.
[17]徐东海,王树众,公彦猛,等.城市污泥超临界水氧化技术示范装置及其经济性分析[J].现代化工,2009,29(5):55-61.
[18]肖琼.处置一吨污泥要花多少钱?[J].环境经济,2015,(S7):36.
[19]闫笑炜.污泥处理市场乱象调查[J].能源,2016,(3):64-69.
[20]道客巴巴网.污泥焚烧处理技术及工程实例[EB/OL].[2015-03-11].http://www.doc88.com/p-0337214314570.html.