Operations of Marine Auxiliary Boiler Operations of Marine Auxiliary Boiler

机电系： 叶 晓 华

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Course introductionCourse introduction

Course Type: practice course

Time : 7 hours

Students: the third grade

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The Main ContentThe Main ContentThe Main ContentThe Main Content

Main Content Time

1 Basic principle and construction 1 hour

2 Operations introduction 1.5 hours

3 Operations practice 4 hours

4Sum up the main points of the lesson

half an hour

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Question: Please list the use of marine boilers

[Auxiliary/Donkey Boiler] ： producing Superheated Ste

am( 过热蒸汽 ) and Saturated Steam ( 饱和蒸汽 )to drive auxiliary machinery,to heat fuel oil,lube oil,flesh water, or for air conditioner and daily use.

Basic principle and construction Basic principle and construction

[Main Boiler] ： producing Superheated Steam( 过热蒸汽 ) to drive main engine.

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一， Basic Types1.According to the heat source

[Exhaust Boiler ] :from main engine exhaust gas

[oil-burning Boiler]:from combustion

Question: As we know,there is an exhaust boiler on board.why do we still need an oil-burning bioler?

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一， Basic Types

2.According to the structure

[Smoke-tube Boiler]

[Water-tube Boiler]

[Mixed-type Boiler]

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3. According to the water circulation

[Natural Circulating Boiler] ： The power of water cycle is from density difference.

[Forced Circulating Boiler] ： The water cycle is due to pumps.

一， Basic Types

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Question:which level is higher,the level in water gauage or the steam drum level?

Downcomer Riser

Steam Drum

Water Drum

the natural water cycle principlethe natural water cycle principle

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1.Smoke-tube Boiler

二， Consturction

burnerfurnace

combustion chamber

smoke box

funnel

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To ensure that oil mist from the atomizer can mix a certain air (10~30%)

To supply the most air for combustion(70~90%)

一次风 二次风[Primary Air]

[Secondary Air]

Atomizer

Air Diffuser

Burner[ 燃烧器 ]

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Flame Sensor[ 火焰感受器 ]

Forced Draught Fan[ 风机 ]

Sight Glass[ 观察镜 ]

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Damper[ 风门 ]

Oil Supply Line[ 供油管 ] Oil Return

Line[ 回油管 ]

Servomotor for Air Regulator[ 风量调节伺服电机 ]

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Oil Pump[ 油泵 ]

Solenoid Valve[ 电磁阀 ]

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2.water-tube boiler

1-Steam Drum[ 汽包 ]2-Water Drum[ 水筒 ]

3-Water Wall Header4-Furnace5-Water wall

6 、 7-Generating tubes8 、 9-downcomer

10-Burner11-Superheater

1700oC

1100oC

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三、锅炉附件 [Boiler Mountings]

Certain fittings are necessary on a boiler to ensure its safe operation. They are usually referred to as Boiler Mountings. The mountings found on a boiler are:

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Water Level Indicators(Water Level Gauage)

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Safety Valves

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Automatic feed water regulator 自动给水调节器

control modes : two-position control proportional control

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Main steam stop valve 主停汽阀

Auxiliary steam stop valve 辅停汽阀

Air release valve 放气旋塞

Sampling Connection 取样接头

Blow down valve 泄放阀 ( 下排污阀 )

Scum valve 除渣阀 ( 上排污阀 )

Sootblower 吹灰器

The Other Boiler Mountings

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To Sum Up

Marine auxiliary boiler is an important plant.Its structure is very complex .It will take us a long time to learn to operate it.

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Thanks a lot for your listen!