电伴热简介

电伴热简介

1.电伴热简介

Brief Introduction of Electric Heat Trace

电伴热是用电热的能量来补充被伴热体在工艺流程中所散失日记本封面 的热量.电伴热具有热效率高，节约

能源，设计简单，施工安装方便，无污染，使用寿命长，能实现遥控和自动控制等优点，是取代蒸汽

伴热的技术发展方向，是国家重点推广的节能环保项目。

Electric heat trace is, by heating, ud to compensate for the heat loss from the heated objects during process

flows. Electric heat trace has the following advantages: high efficiency, energy saving, simple design, safe and

easy to installation , no pollution, long u life, remote control and automatic control, etc. It's the technical trend

to take the place of steam heating. It's also one of the State's important environmental projects of energy

saving.

我公司电伴系列产品符合GB19518.1-2004国家标准规定，并取得防爆合格证和生产许可证。

The ries of our product's comply witn tne rule of National Stanard, Ana Manufaceure licen ana Explosion

Proof Certificate have also been obtainea,

2.电伴热带型号

Types of Electric Heating Cable

Application of Electric heat trace

3.电伴热应用场合

(1) 石油管线防凝、解蜡和伴热保温。

Oil pipes freeze protcction, wax melting and thermal insulation.

Oil fields: freeze protcction for oil extraction tree.

Chemical pipes, tanks, meter pipes: thermal insulation.

Petrol platform on the a: thermal insulation for pipes and freeze protection for water pipes.

Oil storage in ports: thermal 节哀顺变的安慰话语 insulation for the media pipes and freeze protection for water pipes.

(2) 油田井口采油树的伴热防凝。

(3) 化工管道、罐体、仪表管线的伴热保温。

(4) 海上石油平台输油管线伴热和水管线防冻。

(5) 港口码头油库介质管线的伴热保温和水管线的防冻。

2.管道散热量的计算

管道散热量的计算

Caculation for Heat Loss of Pipes and Cable Length

要计算管道散热量，先要知道下列各参数：介质维持温度 T；管道材质、公称口径(D)和长度 (m)；

jN

最低环境气温(T)； 重视的意思 用多少厚的何种保温材料？具体计算方法有以下两种：

0

Before calculating the hea爱情的电视剧 t loss, the following parameters must be gained: maintaince

Temperature for media Tj, Pipe material, Pipe diameter (D), Pipe length (m), lowest ambient

N

temperature, thermal insulation material and insulation thickness () . Following two methods

can be ud:

(1)查表计算

Calculating by check Table

根据 △T = T 一 T、 DN 和保温层?厚度 , 查 " 表 3-1 "可得单位长度管道标准散热量Q。

j0b

On the basis of △T = T 一 T、 DN,,check

j0

Table3-1 and find the caculated heat loss Q per unit length.

b

然后，根据下列公式计算管道实际散热量：

Calculate the actual heat loss O according to the following formula:

s

Q = K. K. K. Q„„„„„„ (3-1 )

s123b

式中：











Q--单位长度管道的实际热散失量，w/m

s

Q--单位长度管道的标准热散失量，w/m

b

K--保温材料导热系数修正值，查“表 3-2”

1

K--管道材料修正系数，查“表 3-3”

2

K--环境条件修正系数，查“表 3-4”

3

Thereinto :











Q-- actual heat loss per unit length pipe, w/m

s

Q--standard heat loss per unit length pipe, w/m

b

K--correct factor of thermal insulation material's coefficient,Refer to table

1

"3-2"

K-- correct factor of pipe material, refer to table"3-3"

2

K-- correct factor of environmental conditions, refer to table "3-4"

3

表3-1：管道标准散热量( Q )条件:碳钢管道、玻璃纤维保温、室外、风速9m/s.单位:w/m

b

Table 3炒芹菜的做法大全 -1: Conditions of pipe standard hea loss(Q):Carbon steel pipe,glass fiber thermal

b

insulation, outdoor, and wind speed

9m/s

表 3-2： 保温材料导热系数及保温修正系数 K

1

Table 3-2: Coefficient of thermal insulation material and Correct factor K

1

保温材料 保温修正系数K

Thermal insulation material Correct Factor

10导热系统（w/m.k)

℃

Thermal Conduct Coefficient

1

超细玻璃纤维 ( 管壳、棉毡 )

Extra-fine Glass Fiber ( Shell Wool Felt )

0.036 1.0

0.044 1.22

0.35 0.97

0.024 0.67

0.038 1.06

岩棉 ( 管壳、棉毡 )

Rock Wool (Shell,Wool Felt

复合硅酸盐

Complex Silicate

聚氨酸泡沫塑料

Polyurethane Foam Plastic

矿渣棉

Mineral Wool

硅酸铝

Aluminum Silicate

0.056 1.56

0.047 1.31

0.054 1.5

0.035 0.97

珍珠岩管壳

Pearl Shell Rock Wool

硅酸钙

Calcium Silicate

聚乙烯泡沫塑料

Polyethane Foam Plastic

表 3-3： 管道材料修正系数K

2

Table 3-3:Correct Factor K of Pipe Material

2

管道材料 Pipe Material 修正系数KCorrect Factor

碳 钢 Carbon Steel 1.0

铜 Copper 0.9

不锈钢 Stainless Steel 1.25

塑 料 Plastic 1.5

表3-4： 环境条件修正系数K

3

Table3-4 Correct Factor K of Environmental Conditions

3

环境条件 Environmental Conditions 修正系数KCorrect Factor

室外风速20m/s Outdoor Wind Speed 1.10

室外风速9m/s Outdoor Wind Speed 1.0

室外风速5m/s Outd?oor Wind Speed 0.95

室内 Indoor 0.9

(2)公式计算法

Calculation by Formula

Loss Formula Calculation:

式中：

Q--管道实际散热量，w/m

s

T --介质维持温度，℃

j

T--冬天最低温度， ℃

0

--在时保温材料的导热系数，w/m .℃

d-- 管道外径,mm

--保温层厚度，mm

2

3

Herinto：

Actual pipe heat loss

Media maintenance temperature

Lowest ambient temperature

Coefficient of thermal insulation

atBR>Outer diameter of pipe

Thickness of thermal insuliation

3.容器和罐体散热量计算

容器和罐体散热量计算

Caculation for Heat Loss of Tanks

(1)根据容器罐体外形尺寸，计算总表面积 S， m

According to the outer size of containers or tanks,calculate the total surface

ares

(2)根据保温层材质、厚度、T和 T，查“表3－5”，求出容器罐体单位面积热损失量Q，

0jb

2

w/m 。如果采用非表列的保温材料，先按“玻璃纤维”阴超检查 查取 Q，按“表 3-2”修正。

b

ccording to material and thickness of thermal insulation, temperature TO and T,

j

calculate the surfaceheat heat loss per unit area by referring to Table 3-5.

2

(3)求总热损失量Q： Q=(1.2 ~ 1.5)Q . S „„ (3-3) , W

zzb

Calculate the Total Heat Loss:

式中： Herinto：

 

 

Q- 一单位面积的热损失 I w/m Heat loss per Unit area

b

2

S-- 总散热表面积 I m Total surface area of loss

2

(4) 计算所需电伴热带长度 L: L = Q / P+ L „„ (3-4 )

yyz0 W

Calculate length of electric heating cable:

式中：

Q-- 容器总散热量 ,W

z

P-- 能适用于介质最高维持温度电热带的米功率，w/m，选用时查表“2-1～2-3”

0

L-- 安装用长度，视各种接线盒总数定，一般每个接线盒线留 1 ～ 2m 。

W

Hereinto:

Total heat loss of conatiner

Wattage per meter suitable to the highest maintenance temperature for electric heating

cable ,W/m. Refer to table 2-1~2-3.

Installation length on the basis of the n汆白肉 umber of junction boxes,generally 1~2m for

each junction box

单位：w/m

2

表 3-5：容器罐体散热量 (Q)

b

Table 3-5:Heat Loss of Tanks(Q) Unit:w/m

b2

.电热带选型

(1) 根据供电条件、电网负荷及电伴热带使用长度等因素来选择电伴热带的型式、电压等级，以

便确定是用并联式还是串职业生涯规划论文 联式？是单相还是三相带？对长输管线，一般选用串联带；对管网

系统则可选用恒功率三相带，如果管线较短，可选用恒功率单相带。

Choo the cable type according to power supply condition and power net load ,decide

if u parallel connection or ries connection type cables, single pha or three

pha type cables. Generally, ries connection type cables are ud on long pipes.

For pipe net system, constant wattage three pha type cables are suitable, if pipes

are shorter, constant wattage single pha typ单位收入证明 e cables are suitable.

(2) 根据管道介质的最高工艺温度来确定电伴热带的规格，即电伴热带的米功率。

Decide the cable type(e per meter),according to the highest process

temperature of media in pipe.

(3) 根据管道或容器罐体总散热量和选定的电热带米功率，计算所需电热带总长度。由于管线带

有弯头，闸门、托架等附件，因此，并联带订货长度一般增加 5% -10% 。

Calculate the total length of electric heating cables needed acco-rding to total heat

loss of pipes or tanks and the chon power per meter. As pipes have bends, valves

and brackets, the length to be ordered should add 5%~10%.

(4) 根据使用场所来确定电伴热带的结构： 在海边、海洋平台、埋敷地下或有腐蚀性气(液)场所，

必须选加强型。

According to applying locations lect cable type: reinforced type shall be ud for

a shore, a platforms, undergro福字草书 und or corrosive locations.