1948-05-13 — Page 8

THE CHINA MAIL, THURSDAY, MAY 13, 1948.

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ENGINEERING PAGE

IN

NEW FEATURES IN MODERN POWER STATIONS

Present plans for

Increasing

By HUGH P. VOWLES

A Member of Britain's Institution of Mechanical Engineers and part author of "The Quest for Power."

Station),

Company, London where the main alternators are designed for generating at 33,000 velis. The speed for these units is 3,000.re- volutions a minute as in the case lower of units designed for a voltage. Recent Government in- structions that all future generat- Ing plant above 10,000 kilowatts

but

monu-

the generating capacity of Bri- min's electricity supply system provide for the installation, by December

plant 1951, of new with

an aggregate capacity of 5,750,000 kilowatts. Besides ad- ditional plant which is being in stalled in existing stations, pro- vision is made for building new which show recent developments [solved many new problems such capacity for the home (but not stations in various parts of Bri-in power station practice in Bel-ns erosion of low pressure turbine export market is to be

of two sizes tain, Work on 12 of

blades and increased risk; of ex-factured in one the new tal. stations is now in progress, while One of the most important of cessive distortion in the cylinder should result in considerable eco- The sizes salected ure Increase in severni

steam and rotor. other projects await the these is the

2000 kilowatts with steam at selection of suitable sites.

preauren and

temperatures. Pulerised Fuel 30,000. varios Steam conditions which were the

600 D

pounds per squaré

and inch Progress already made from site preparation and other exception 10 years ago have now

850 desrees Fahrenheit, and 40,- The average evaporative caps- 850 age have no city of the boller units to be in-000 kilowatts with steam at 200 scalisi preliminary work, as been adopted as

200,000 to 350,000- at Glasgow, Scotland (Brachead course for new installations. For stalled

pounds per square inch and 900 of steam

an" hour, degrees

ces Fahrenheit. Station), to partial construction example, at Birkenhead, England pounds

the Pulverised fuel

general- There Ang is

is some difference of of buildings and erection of plant (Bromsborough

among opinion

electrical en. As at Ipswich (Cliff Quay Stu- turbines will operate with steam ly adopted, Indicating apprecia- the advantages which tlon), Poole, and Kingston-on-at 950-pounds per square inch tion an

hich gingers in Britain us to the ad- of hydrogen cooling Thames, all in England. It may and a temperating of 025 degreen this system affords in conjunc- vantages be noted that considerable diffi-Fahrenheit. At Poole, the co- of these advantages is that the incrensed

alternators, tion with large boller units. One for сог

claims for efficiency, In responding figures will be 000- culty has been experienced

uding suitable alter, and in some pounds per square inch and 125 altendant labour required need life of insulation, and lower fire

been Again, at not exceed that which is neces-bazard

have nazard

made cases extensive initial civil on-degrees Fahrenheit.

In for qil Aring. Lontion gineering work has been neces- Poplar,

(Brunswick any

This America. The system is being of this is Wharf Station), and Glasgow facilitates the adoption of a prae- adopted for the 50,000 kilowatt sary. One example

10 be installed at provided by the new power sta-i (Brachead/ Station), 900-pounds tice for which provision has been alternators

made at Poplar, where the boilers Birkenhead (Bromborough Sta- for the new station will be frod

tion) and results attained there with pulverised fuel but oil fuel will, no doubt, be of general in- will be used for lighting up.

terest to station engineers in Another practice which has Britain. been generally endorsed by the engineers responsible for design. ing the new stations is the use Power station architecture hat of electrostafle precipitators for improved in recent years. It is the control of dust and grit emis- no longer considered necessary to sion. In the majority of cases overiny structural form with ir- such plant will be installed on relevant decoration, reminiscent Duiverised-fuel-fired-boilers, but of the lions heads and baric Kingston-on-Thames power sta- columns which were added to tion will/have the unusual com- many early

many

steam engines. bination of electrostatic precipi- Aesthetically, what is demanded fotors with chain grate stoker of power station. now is har- Aring.

many between form and function,

Two of the 50,000. Kw. generators at Hamo Hall, naar. Birmingham, The housing of the two generators in this manner gives an uninterrupted view from the Shift Charge "Engineer's office.

Linn now being constructed at the south-coast town Poole, the site for which was obtained by reclaiming a portion of Holes Bay in the harbour of Poole.

Leading Characteristics

The designs for the new power stations contain many features of great interest; here are a few

Increased

Form And Function

Considerable Draught with contours free from mere-

arc

Loss

tricioas adornment The advice of Britain's Royal Fine Arts Com- Electrostatic precipitators In-mission was taken when the new stalled on the bollers of the al-po

power stations were baing de ready existing Hams Hall power signed. The good effects of this station, Birmingham, England, step may already be seen as some the buildings approach com- guaranteed to give an effi-

pletion. elency of 80.5 per cent, when a boller is operating_at_maximum continuous rating (320,000 bounds of steam an hour) and with four grains per cubic foot of dust in the gases entering the arrestors. secure un cquivalent efin ciency with multiplo cyclones

To

Smallest Tube

In The World-

would Involve considerable Accles & Policek Limited, of draught loss. Hence the general Oldbury, Birmingham, England, resort to electrostatic precipitare showing what they claim is tors, which also have the

ad the smallest tube in the world vantage that their officiency in the British Industries Fair creases as the boller duty falls (London and Birmingham, May so that halving the boller duty to 14.) This tube, which is of. would result in reducing the stainless steel and has an Inside atmospheric pollution by nearly diameter of :0007 inches, will be half- characteristic not pos- on view in the Birmingham sec- sessed by cyclone

lane collectors.

tion of the Fair. High precision There is closer

ser approxima tubes, diesel tubes, composite tion to standardisation in the

tubes,

and multi-bore tubes of aizes of turbo-alternator units that would have been noted 10 small diameter and extreme ac-

curacy, will be shown. years ago, though scope for fur- A range of hypodermic needle ther progress remains. A num- tubing and small diameter iubes ber of units are designed for an i non-ferrous metals are In- output of 50,000 kilowatts, while cluded. Interesting examples of other sizes are 52.000, 52,250, 45,- tubular manipulation will include 000, 32,000 and 30,000 kilowatts. cycle tubes and components, The majority of the alternatore tubular furniture bends and bus Together with a speed of 3,000 are wound for 11,000 volts, one seat frames.. A range of tubular revolutions a minute, for which notable exception being the gon-box spanners and spanner most of the new turbines-are--erating plant-for-the-Rye-House will also be featured. designed, these conditions have station of the Northmet Power

per square inch and 000 degrees Fahrenhelt have been adopted.

Apart from the quest for ef- fletency, the increase in the cost of coal and deterioration in its caloride value have undoubtedly accelerated the movement to- wards higher steam conditions.

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The Brunswick Wharf Power Station in Poplar, `

AN ADAPTABLE CRANE

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