论文总字数:29815字
摘 要
同时,在干燥污泥的过程中,由于气流的作用,部分污泥小颗粒被带入气流之中,致使干燥机出口气体粉尘含量较高,无法直接达标排放,需要进行除尘处理。
当污泥干燥到20%左右时,需要将污泥粉尘利用流体输送器械将其输送到磨煤机处与煤粉混合。
本次设计是在对现有电厂废气处理系统的基础上增设一个系统使其在干燥污泥并将污泥送至锅炉和净化其产生的废气以实现对电厂污泥的清洁处理。
关键词:滚筒式污泥干燥机、旋风除尘器、布袋除尘器、离心风机
The design of sludge drying and incineration system
03214730 Li Hao-ran
Supervised by Guo hongwei
Abstract: Since entering the modern society, the total amount of sewage and waste water produced by people's production and daily life has been increasing, and as the subsidiary products,the sludge,whose disposal issues are also being discussed. In the all sludge disposal techniques, because of the expensive cost of many sludge disposal equipment, the complex operation, and the high professional requires of the staff, many sludge disposal methods only stay in the laboratory stage, and can not be widely used in the factory. The sludge of power plant can not meet the standard of reduction only through initial mechanical dewatering. (Generally, the sludge moisture content is reduced to 80% by this way, and the sludge still contains a lot of water.)It resulted in the need for redrying of the sludge from power plants to reduce the cost of sludge treatment.
At the same time, in the process of dry sludge, due to the effect of the airflow, part of the sludge granules were into the air, the dust content of the gas out of the dryer is high, can not directly discharge standard, dust removal process is need.
When the sludge is dried to about 20%, the sludge dust needs to be transported to the coal grinder with a fluid conveyer.
On the basis of the existing waste gas treatment system of the power plant, this design adds a system which has a set of equipment for drying the sludge, transfers the sludge to the boiler and purifying the waste gas from system to realize the aim of the clean treatment of the sludge from power plant.
Key words: drum dryer;cyclone separator;pulsed jet cloth filter;Centrifugal blower
主要符号表
--------------------湿基含水率,%; --------------------干基含水率,%;
m--------------------质量,kg; tm--------------------湿基温度,℃;
w--------------------含水率,%; A-----------------------干燥面积,m2;
W--------------------绝干物料的质量,kg; L---------------绝干空气流量,kg/h;
Q1,Q3-----------进出污泥热量,kJ/h; Q5------干燥热损,kJ/h;
Q2,Q4------进出干燥机气体热量,kJ/h; G1,G2 ------进出干燥机污泥的质量,kg/h;
φ1,φ2------进出干燥机污泥含水率; T1,T2------进出污泥温度,℃;
C1,C2------进出干燥机污泥比热容,kJ/(kg·K); I1,I2——进出气体焓值,kJ/kg;
H1,H2——进出气体湿度,kg水蒸汽/kg干空气; t1,t2——进出气体温度,℃;
Q蒸--------------------水分蒸发所需热量,kJ; Q绝干-------绝干污泥带走热量,kJ;
Q5-------------设备损失热量,kJ; Q放--------干燥空气释放热量,kJ;
Cp-----定压比热容,kJ/(kg·K); Cs-------污泥的比热容,kJ/(kg·K);
p----------气体压力(压强),单位取Pa; V----------------气体体积, m3;
n------------气体的物质的量,单位取mol; Q-------------------处理风量,m3/h;
n0---------------旋风子个数; D0------------------旋风子内径,m;
v-----------------旋风子筒体断面气体流速,m/s; -------------------------为阻力系数;
ρ--------------------流体密度,m3/s; ui--------------进口气体流速,m/s;
S----------单条圆形滤袋的公称面积,m2; D-----------------------滤袋直径,m;
L----------滤袋长度,m; S有效---滤袋有效过滤面积,m2;
S废----------滤袋失去过滤作用面积,m2; F----------------------过滤面积,m2;
v----------过滤风速,m/min; Q------------------气体流量,m3/h;
Vk--------------------气流上升速度,m/min; A---------------滤袋室截面积,m2;
N1----------滤袋室滤袋数; f-----------------单个滤袋占有面积;
Rf----------颗粒比阻力系数,min/(g·m); ρ---------------------尘浓度,g/m3;
vf----------过滤风速,m/min; t------------------清灰时间,min;
ζ----------阻力系数; ----------气体的运动粘度,m2/s;
α----------弯头角度(°); R----------弯头转弯半径(m); D----------弯头直径(m); K1---考虑由于漏风附加的安全系数;
SC----------干燥系统的安全余量; WC----------进料含水率;
FWC----------目标含水率
目 录
1绪论……………………………………………………………………………………………1
1.1 设计背景……………………………………………………………………………………1
1.1.1 我国污泥处置现状分析…………………………………………………………………1
1.1.2研究意义……………………………………………………………………………………1
1.1.3 电厂污泥性质……………………………………………………………………………2
1.2 污泥干燥原理………………………………………………………………………………2
1.2.1 含水率……………………………………………………………………………………2
1.2.2 污泥干燥特性……………………………………………………………………………2
1.3 主要污泥干燥技术及代表干燥机………………………………………………………… 3
1.3.1 干燥技术……………………………………………………………………………………3
1.3.2代表装置及其比较干燥机…………………………………………………………………3
1.4 滚筒式干燥机……………………………………………………………………………… 4
1.4.1 结构说明………………………………………………………………………………… 4
1.4.2 工作过程………………………………………………………………………………… 5
1.5 技术要点……………………………………………………………………………5
2设计计算说明书………………………………………………………………………………6
2.1 概述…………………………………………………………………………………………6
2.1.1 设计任务…………………………………………………………………………………6
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