大气污染控制工程课程设计-静电除尘器

K

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一、课程设计的目的二、设计原始资料

2.

三、设计内容

一、燃煤锅炉排烟量及烟尘和二氧化硫浓度的计算

m

/kg

C、

、、

——分别为煤中各元素所含的质量分数。

m

/kg

W

N

m

/kg

m

/kg;W

—

—煤中水分所占质量分数；N

—

—N元素在煤中所占的质量分数。

m/kg

m

/kg

m

/kg

m

/kg

设计耗煤量

m/kg

m/

d

kg/m

d

—

—排烟中飞灰占煤中不可燃成分的质量分数

—

—标准状态下烟气量，m

mg/m

C

(mg/m)

m/kg

mg

/m

二．板式电除尘器的设计计算

h

m

400mm

3~11m

F

m

p

p

pN N

g

m

e

mm—烟气量，

;mm

m

400mm

,

,

,

,

,

m

cm

mw

m

)

m

/n

3~4

hh

F

h

F

m

h=3m

250~300mm400mm

F

)40mm

F

mmh

mmFF

)

m

/

m/F

l

l

l

m

l

l

mm

)

mm

e mme

mm

mmL

L

mm

e

mmL

mm

1B1 232L

hh

mm

h

mm

—撞击杆中心到灰斗上端

的距离，取

mm。

mm

mml

e

mml

e

mm

C

mmL

l

e e

mm L

l

l d e

mm

m

l L

l

l

d

mme e

m

F

mmLZ,,L

~

,

—F

和F

处最大边长； KF

—进气箱大端面积。KF

F

mm

h

F

F

mm

h

mm

L

tg

mm

L

L

mm

W h

mm

mmmm

L

FK

F

F

F

F

N

K

—

阻力系数；N

—气流在入口处按气流动

量计算的速度场系数，

取

N

； n

Fr

Fr

r

—

F

断面的水力直径。

n

Fn

Fn

r

m

r

m

l

l

Fn

Fn

nr r

—

F

断面的水力直径。

F

r

l

m

m

为避免分布板沉积下来的粉尘堵塞。在分布板与进、出气底端之间要有一定间隙

mm

3mm25mm400mm

~

~

BS

50mg/m3

100mm

~

mm

mm

mm YC

M

C

M

kW

~

cmcm

~

cmcm

m

I

mA

三、

电除尘器的保温和防腐

d

mm

—工况下管道内的烟气流量，

；mm

~m

m

m

d

m

外径

mm

外径允许偏差

mm

壁厚

mm

d

m

d

m

d

四、

烟囱的设计

m

d

m

—通过烟囱的总烟气量，

；mm

m

(m)

m

d

md

m。d

d

i m

d

—烟囱出口直径，

mii

~

i

，d

m

)

)

m

—外界空气温度，℃；

—烟囱内烟气平均温度，℃;p

p

d

五、系统阻力的计算

Lmd

mm

m

L

p

•

(

)L—和管道相对粗糙度值可取，对砖砌或混凝土管道值可取）。

L

m

Kd

的函数。

kg

m

L

mm

mm

A

X

p

(

)

m

m

—烟气密度，

m。1

230

时，

，

m

p

)

l

m

h

mh

p

)

p

)

l

m

时，

，

m

p