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Report - - Littlebrook "D" Power Station, Dartford - October 2018 | UK Power Stations | 28DaysLater.co.uk

Report - Littlebrook "D" Power Station, Dartford - October 2018

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28DL Full Member
28DL Full Member
History

The first power station on the site was the coal-filed Littlebrook A Power Station, built by the County of London Electric Lighting Co. in the early 1930s. It was opened in 1939.
The 1st photo below shows Littlebrook site A, B, C stations, the turbine in the 2nd photo would have been used in Littlebrook A in the 1930's

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Littlebrook D was an oil-fired power station and was built by the nationalised Central Electricity Generating Board. The station was built by the Cleveland Bridge Company with construction starting in 1976.The first unit commissioning underway by 1981. The 1980s still saw a potential threat from the Cold War, and as such the CEGB designed Littlebrook D as a robust station with high plant redundancy, meaning that the station would have formed a pivotal role should disaster have struck the city of London. At this time, London was still dependent on several smaller generating stations within the city itself. Due to the flexibility of the oil-fired boilers, a cold unit could be synchronised onto the grid within 4 hours; the increased ability to rapidly increase or decrease load formed a significant part of what made the station attractive on a commercial basis. The boilers had an output capacity of 1788 kg/s of steam. Steam was delivered to the turbines at 158.6 bar and 538°C. Five 110,000-tonne fuel oil storage tanks were used to store the heavy fuel oil for the main units, and this fuel was delivered to the site by tankers mooring at one of the site's two jetties on the River Thames.

Originally built with three operational units having a design rating of 660 MW MCR (Maximum Continuous Rating), this was increased to 685 MW during commissioning with practically no additional engineering works required which is testament to the robust design standards rigorously upheld by the CEGB.
This total generating capacity of 1,370 MW (1,475 MW including open-cycle gas turbines - was enough power to meet the needs of over 2 million people.
Unit 3 was held in "long term reserve" for a number of years prior to the station's closure, mainly due to the wear and tear the boiler experienced during the UK miners strike 1984 to 1985 where oil-fired stations were run aggressively while the base load coal stations were struggling to obtain fuel.
During this strike all three units operated simultaneously and continuously throughout, with the exception of a short repair period to Unit 3's boiler, thereby exceeding its design intent by continuously generating 2055 MWSO. This resulted in an annual generation of circa 18 000 GW which may be the unofficial record for the CEGB's 2000 MW class of power station. The remaining two units were still fully operational up to the site's closure, having undergone massive refurbishment investment to increase their efficiency and further improve the quality of emissions from the 215 m (705 ft) tall chimney, which was the fourth tallest chimney in the UK. This investment included the addition of an electrostatic precipitator to remove any particulates present in the flue gas before it left the chimney, and later, upgrading the unit control to a modern PLC (Programmable Logic Controller) based system.

Littlebrook D was one of a number of stations throughout the UK with black-start capabilities, meaning that it was able to start generating without an external power supply - the station would be one of the first to start generating should the UK experience a partial or complete blackout. Littlebrook D played a vital role in restoring power supplies to the South East of England in the days following the storm force winds of October 1987.

The black-start capability was facilitated by the presence of three open-cycle gas turbines (OCGTs), each capable of generating 35 MW, which was sufficient to operate the station auxiliary equipment and allow a main unit to be started. Each OCGT set incorporated two Rolls-Royce Olympus jet engines which are industrial derivatives of those that were used on the Concorde aircraft. As well as providing black-start supplies to the station, the fact that they could synchronise and ramp up to full load in under five minutes means they were used to generate at the request of National Grid Company (who operated the UK electricity grid system) to deal with short-term peaks in demand. Such peaks typically arise during the winter months, where evening demand is higher due to lighting and heating requirements. A further facility provided to the National Grid Company by the OCGTs was one of system protection. They would start automatically should the system frequency (50.0 Hz in the UK) fall to 49.6 Hz, which would indicate that the supply from generation was not sufficient to meet the demand. The National Grid Company are obliged to ensure that there is enough operating reserve available at all times and as such, low frequency events are rare and will only arise where a substantial loss of generation has occurred.

A modification was made to one of the units which allowed for alternative fuel trials. Several were trialled at the Littlebrook D site as part of research into generating energy from more sustainable fuel sources.

After privatisation in 1991, the station was owned by National Power, and later by its subdivision Innogy plc. The station was finally owned by RWE npower which is owned by the German energy company RWE. They decided that Littlebrook would "opt-out" under the Large Combustion Plant Directive, an EU directive aiming to deal with air pollutants created by the combustion of fossil fuels. This essentially meant that Littlebrook D would have to cease to generate after 2015 in its final configuration.
The station ceased operating on 31 March 2015.


As a result of Littlebrook Power Station D's closure, each nine 185 Tonne sub station transformers were removed from the power station and delivered to Drax Power Station in Selby for refurbishment, this required RoRo Barge shipments, SPMT operations and M25 closures.

Littlebrook Power Station was finally demolished by explosion on Friday 30 August 2019. The chimney, the second highest remaining at the time of its demolition, was demolished at 8am on 15 December 2019.


Explore

Explored with PV and @Terminal Decline one very early morning, a little late to the party with this one but there was still plenty to see.



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Thanks for looking :thumb
 
Last edited:

Calamity Jane

i see beauty in the unloved, places & things
Regular User
Very nice. Lovely photos. I had family that worked here, so seeing the demo was sad. The view just isnt the same from my rd anymore
 

monk

mature
28DL Full Member
Lovely report.
Walking the wobbly stairs to the roof in the dark is a memory I wont forget from here.
 
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