磨煤机的英文,中速磨煤机结构图

本文目录

• 1.中速磨煤机结构图
• 2.火电厂中学在开封排名
• 3.需要一些关于火力电厂流程的英文资料怎么写
• 4.给煤机用英语怎么说呢

中速磨煤机结构图

中速磨煤机型号中字母意思可以概括为：

以中速磨煤机型号MPS255为例：

MPS磨煤机型号的含义：

M：磨机 取德文Mueller（英文Mill）第一个字母M；

P：摆动 取德文Pendel（英文Parter）第一个字母P；

S：盘子 取德文Schuessel（英文Ship）第一个字母S；

255是磨煤量或者设备大小

火电厂中学在开封排名

朋友，1、喷淋油是对磨机大小齿轮进行喷雾润滑，通常喷到小齿轮上。

2、低压油泵将油打到主轴承顶部喷淋油管，进而喷到筒体中空轴表面，对中空轴和下方的球面瓦进行润滑。

3高压油泵将润滑油打入球面瓦底部，通过高压油作用于中空轴上，将整个筒体浮起，确保形成油膜。

需要一些关于火力电厂流程的英文资料怎么写

Thermal power station - Wikipedia, the free encyclopediaHelp us provide free

content to the world by donating today!Thermal power station

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A thermal power station near Sofia, Bulgaria

Mohave Generating Station, a 1,580 MW thermal power station near Laughlin,

Nevada fuelled by coal

Geothermal power station in IcelandEnergy portal

A thermal power station is a power plant in which the prime mover is steam

driven. Water is heated, turns into steam and spins a steam turbine which drives

an electrical generator. After it passes through the turbine, the steam is

condensed in a condenser; this is known as a Rankine cycle. The greatest

variation in the design of thermal power stations is due to the different fuel

sources. Some prefer to use the term energy center because such facilities

convert forms of heat energy into electrical energy. However, power plant is the

most common term in the United States, while power station prevails in many

Commonwealth countries and especially in the United Kingdom.

Almost all coal, nuclear, geothermal, solar thermal electric, and waste

incineration plants, as well as many natural gas power plants are thermal.

Natural gas is frequently combusted in gas turbines as well as boilers. The

waste heat from a gas turbine can be used to raise steam, in a combined cycle

plant that improves overall efficiency.

Such power stations are most usually constructed on a very large scale and

designed for continuous operation.

Contents [hide]

1 History

2 Efficiency

3 Diagram of a typical coal-fired thermal power station

4 Steam generator

4.1 Boiler furnace and steam drum

4.2 Fuel preparation system

4.3 Fuel firing system and igniter system

4.4 Air path

4.5 Auxiliary systems

4.5.1 Fly ash collection

4.5.2 Bottom ash collection and disposal

4.5.3 Boiler make-up water treatment plant and storage

5 Steam turbine-driven electric generator

5.1 Barring gear (or Turning gear)

5.2 Condenser

5.3 Feedwater heater

5.4 Superheater

5.5 Deaerator

5.6 Auxiliary systems

5.6.1 Oil system

5.6.2 Generator heat dissipation

5.6.3 Generator high voltage system

6 Other systems

6.1 Monitoring and alarm system

6.2 Battery supplied emergency lighting and communication

7 Transport of coal fuel to site and to storage

8 See also

9 References

10 External links

[edit] History

Reciprocating steam engines have been used for mechanical power sources since

the 18th Century, with notable improvements being made by James Watt. The very

first commercial central electrical generating stations in New York and London,

in 1882, also used reciprocating steam engines. As generator sizes increased,

eventually turbines took over due to higher efficiency and lower cost of

construction. By the 1920s any central station larger than a few thousand

kilowatts would use a turbine prime mover.

[edit] Efficiency

The electric efficiency of a conventional thermal power station, considered as

saleable energy produced at the plant busbars compared with the heating value of

the fuel consumed, is typically 33 to 48% efficient, limited as all heat engines

are by the laws of thermodynamics (See: Carnot cycle). The rest of the energy

must leave the plant in the form of heat. This waste heat can be disposed of

with cooling water or in cooling towers. If the waste heat is instead utilized

for e.g. district heating, it is called cogeneration. An important class of

thermal power station are associated with desalination facilities; these are

typically found in desert countries with large supplies of natural gas and in

these plants, freshwater production and electricity are equally important

co-products.

Since the efficiency of the plant is fundamentally limited by the ratio of the

absolute temperatures of the steam at turbine input and output, efficiency

improvements require use of higher temperature, and therefore higher pressure,

steam. Historically, other working fluids such as mercury have been

experimentally used in a mercury vapour turbine power plant, since these can

attain higher temperatures than water at lower working pressures. However, the

obvious hazards of toxicity, and poor heat transfer properties, have ruled out

mercury as a working fluid.

[edit] Diagram of a typical coal-fired thermal power station

Typical diagram of a coal-fired thermal power station 1. Cooling tower10.

Steam control valve19. Superheater

2. Cooling water pump11. High pressure steam turbine20. Forced draught

(draft) fan

3. Three-phase transmission line12. Deaerator21. Reheater

4. Step-up transformer13. Feedwater heater22. Combustion air intake

5. Electrical generator14. Coal conveyor23. Economiser

6. Low pressure steam turbine15. Coal hopper24. Air preheater

7. Boiler feedwater pump16. Coal pulverizer25. Precipitator

8. Surface condenser17. Boiler steam drum26. Induced draught (draft) fan

9. Intermediate pressure steam turbine18. Bottom ash hopper27. Flue gas

stack

[edit] Steam generator

Schematic diagram of typical coal-fired power plant steam generator highlighting

the air preheater (APH) location. (For simplicity, any radiant section tubing is

not shown.)The steam generating boiler has to produce steam at the high purity,

pressure and temperature required for the steam turbine that drives the

electrical generator. The generator includes the economizer, the steam drum, the

chemical dosing equipment, and the furnace with its steam generating tubes and

the superheater coils. Necessary safety valves are located at suitable points to

avoid excessive boiler pressure. The air and flue gas path equipment include:

forced draft (FD) fan, air preheater (APH), boiler furnace, induced draft (ID)

fan, fly ash collectors (electrostatic precipitator or baghouse) and the flue

gas stack.[1][2][3]

For units over about 200 MW capacity, redundancy of key components is provided

by installing duplicates of the FD fan, APH, fly ash collectors and ID fan with

isolating dampers. On some units of about 60 MW, two boilers per unit may

instead be provided.

[edit] Boiler furnace and steam drum

Once water inside the boiler or steam generator, the process of adding the

latent heat of vaporization or enthalpy is underway. The boiler transfers energy

to the water by the chemical reaction of burning some type of fuel.

The water enters the boiler through a section in the convection pass called the

economizer. From the economizer it passes to the steam drum. Once the water

enters the steam drum it goes down the downcomers to the lower inlet waterwall

headers. From the inlet headers the water rises through the waterwalls and is

eventually turned into steam due to the heat being generated by the burners

located on the front and rear waterwalls (typically). As the water is turned

into steam/vapor in the waterwalls, the steam/vapor once again enters the steam

drum. The steam/vapor is passed through a series of steam and water separators

and then dryers inside the steam drum. The steam separators and dryers remove

the water droplets from the steam and the cycle through the waterwalls is

repeated. This process is known as natural circulation.

The boiler furnace auxiliary equipment includes coal feed nozzles and igniter

guns, soot blowers, water lancing and observation ports (in the furnace walls)

for observation of the furnace interior. Furnace explosions due to any

accumulation of combustible gases after a trip-out are avoided by flushing out

such gases from the combustion zone before igniting the coal.

The steam drum (as well as the superheater coils and headers) have air vents and

drains needed for initial startup. The steam drum has internal devices that

removes moisture from the wet steam entering the drum from the steam generating

tubes. The dry steam then flows into the superheater coils.

Geothermal plants need no boiler since they use naturally occurring steam

sources. Heat exchangers may be used where the geothermal steam is very

corrosive or contains excessive suspended solids. Nuclear plants also boil water

to raise steam, either directly passing the working steam through the reactor or

else using an intermediate heat exchanger.

[edit] Fuel preparation system

In coal-fired power stations, the raw feed coal from the coal storage area is

first crushed into small pieces and then conveyed to the coal feed hoppers at

the boilers. The coal is next pulverized into a very fine powder. The

pulverizers may be ball mills, rotating drum grinders, or other types of

grinders.

Some power stations burn fuel oil rather than coal. The oil must kept warm

(above its pour point) in the fuel oil storage tanks to prevent the oil from

congealing and becoming unpumpable. The oil is usually heated to about 100°C

before being pumped through the furnace fuel oil spray nozzles.

Boilers in some power stations use processed natural gas as their main fuel.

Other power stations may use processed natural gas as auxiliary fuel in the

event that their main fuel supply (coal or oil) is interrupted. In such cases,

separate gas burners are provided on the boiler furnaces.

[edit] Fuel firing system and igniter system

From the pulverized coal bin, coal is blown by hot air through the furnace coal

burners at an angle which imparts a swirling motion to the powdered coal to

enhance mixing of the coal powder with the incoming preheated combustion air and

thus to enhance the combustion.

To provide sufficient combustion temperature in the furnace before igniting the

powdered coal, the furnace temperature is raised by first burning some light

fuel oil or processed natural gas (by using auxiliary burners and igniters

provide for that purpose).

[edit] Air path

External fans are provided to give sufficient air for combustion. The forced

draft fan takes air from the atmosphere and, first warming it in the air

preheater for better combustion, injects it via the air nozzles on the furnace

wall.

The induced draft fan assists the FD fan by drawing out combustible gases from

the furnace, maintaining a slightly negative pressure in the furnace to avoid

backfiring through any opening. At the furnace outlet, and before the furnace

gases are handled by the ID fan, fine dust carried by the outlet gases is

removed to avoid atmospheric pollution. This is an environmental limitation

prescribed by law, and additionally minimizes erosion of the ID fan.

[edit] Auxiliary systems

[edit] Fly ash collection

Fly ash is captured and removed from the flue gas by electrostatic precipitators

or fabric bag filters (or sometimes both) located at the outlet of the furnace

and before the induced draft fan. The fly ash is periodically removed from the

collection hoppers below the precipitators or bag filters. Generally, the fly

ash is pneumatically transported to storage silos for subsequent transport by

trucks or railroad cars.

[edit] Bottom ash collection and disposal

At the bottom of every boiler, a hopper has been provided for collection of the

bottom ash from the bottom of the furnace. This hopper is always filled with

water to quench the ash and clinkers falling down from the furnace. Some

arrangement is included to crush the clinkers and for conveying the crushed

clinkers and bottom ash to a storage site.

[edit] Boiler make-up water treatment plant and storage

Since there is continuous withdrawal of steam and continuous return of

condensate to the boiler, losses due to blow-down and leakages have to be made

up for so as to maintain the desired water level in the boiler steam drum. For

this, continuous make-up water is added to the boiler water system. The

impurities in the raw water input to the plant generally consist of calcium and

magnesium salts which impart hardness to the water. Hardness in the make-up

water to the boiler will form deposits on the tube water surfaces which will

lead to overheating and failure of the tubes. Thus, the salts have to be removed

from the water and that is done by a water demineralising treatment plant (DM).

A DM plant generally consists of cation, anion and mixed bed exchangers. The

final water from this process consists essentially of hydrogen ions and

hydroxide ions which is the chemical composition of pure water. The DM water,

being very pure, becomes highly corrosive once it absorbs oxygen from the

atmosphere because of its very high affinity for oxygen absorption.

The capacity of the DM plant is dictated by the type and quantity of salts in

the raw water input. However, some storage is essential as the DM plant may be

down for maintenance. For this purpose, a storage tank is installed from which

DM water is continuously withdrawn for boiler make-up. The storage tank for DM

water is made from materials not affected by corrosive water, such as PVC. The

piping and valves are generally of stainless steel. Sometimes, a steam

blanketing arrangement or stainless steel doughnut float is provided on top of

the water in the tank to avoid contact with atmospheric air. DM water make-up is

generally added at the steam space of the surface condenser (i.e., the vacuum

side). This arrangement not only sprays the water but also DM water gets

deaerated, with the dissolved gases being removed by the ejector of the

condenser itself.

[edit] Steam turbine-driven electric generator

Rotor of a modern steam turbine, used in a power stationMain article: Turbo

generator

The steam turbine-driven generators have auxiliary systems enabling them to work

satisfactorily and safely. The steam turbine generator being rotating equipment

generally has a heavy, large diameter shaft. The shaft therefore requires not

only supports but also has to be kept in position while running. To minimise the

frictional resistance to the rotation, the shaft has a number of bearings. The

bearing shells, in which the shaft rotates, are lined with a low friction

material like Babbitt metal. Oil lubrication is provided to further reduce the

friction between shaft and bearing surface and to limit the heat generated.

[edit] Barring gear (or Turning gear)

Barring gear is the term used for the mechanism provided for rotation of the

turbine generator shaft at a very low speed (about one revolution per minute)

after unit stoppages for any reason. Once the unit is "tripped" (i.e., the

turbine steam inlet valve is closed), the turbine starts slowing or "coasting

down". When it stops completely, there is a tendency for the turbine shaft to

deflect or bend if allowed to remain in one position too long. This deflection

is because the heat inside the turbine casing tends to concentrate in the top

half of the casing, thus making the top half portion of the shaft hotter than

the bottom half. The shaft therefore warps or bends by millionths of inches,

only detectable by monitoring eccentricity meters.

But this small amount of shaft deflection would be enough to cause vibrations

and damage the entire steam turbine generator unit when it is restarted.

Therefore, the shaft is not permitted to come to a complete stop by a mechanism

known as "turning gear" or "barring gear" that automatically takes over to

rotate the unit at a preset low speed.

If the unit is shut down for major maintenance, then the barring gear must be

kept in service until the temperatures of the casings and bearings are

sufficiently low.

[edit] Condenser

Main article: Surface condenser

Diagram of a typical water-cooled surface condenser.[2][3][4][5]The surface

condenser is a shell and tube heat exchanger in which cooling water is

circulated through the tubes.[6][7][8][2] The exhaust steam from the low

pressure turbine enters the shell where it is cooled and converted to condensate

(water) by flowing over the tubes as shown in the adjacent diagram. Such

condensers use steam ejectors or rotary motor-driven exhausters for continuous

removal of air and gases from the steam side to maintain vacuum.

For best efficiency, the temperature in the condenser must be kept as low as

practical in order to achieve the lowest possible pressure in the condensing

steam. Since the condenser temperature can almost always be kept significantly

below 100 oC where the vapor pressure of water is much less than atmospheric

pressure, the condenser generally works under vacuum. Thus leaks of

non-condensible air into the closed loop must be prevented. Plants operating in

hot climates may have to reduce output if their source of condenser cooling

water becomes warmer; unfortunately this usually coincides with periods of high

electrical demand for air conditioning.

The condenser generally uses either circulating cooling water from a cooling

tower to reject waste heat to the atmosphere, or once-through water from a

river, lake or ocean.

给煤机用英语怎么说呢

给煤机 [jǐ méi jī]

n. feeder

在例句中比较

网络释义专业释义汉语词典

coal feeder

2、 给煤机 （ Coal Feeder ）： 给煤机 的作用是根据磨煤机或锅炉负荷的需要，向磨煤机供给原煤。

基于335个网页-相关网页

Feeder

NJGC

Coal

短语

下给加煤机 underfeed stoker ; underfed stoker

多甑式下给加煤机 [动力] [冶] multiple retort underfeed stoker ; multiple retort underfeed stoker

皮带给煤机 coal belt feeder ; Belt Coal Feede

更多网络短语

秒懂释义

disccoalfeeder, 给煤机适用于火力发电厂燃煤炉制粉系统，能在很大的负荷变动范围内改善锅炉性能，使过热温度、再热温度和压力温度的控制更为稳定，使燃料与所需空气量更为匹配，所需的空气过剩量减少，连续给煤，称量准确，工作稳定，节能高效，是燃煤锅炉制粉系统中与磨煤机相配的先进的计量给煤设备。

董公仁0 0 •••

我来解释一下看看其他词汇的秒懂释义 >>

新汉英大辞典

给煤机 [jǐ méi jī]

feeder

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