Stockport Homes were having biomass boiler performance issues. Their portfolio of 9 boilers included some with 20 storey chimneys that were hard to clean.
Following a full clean down of each chimney, NerG re-fired the boilers and went through a combustion analysis to check the correct operation of the boilers.
Stockport Homes own and operate 9 large Froeling Biomass boilers which supply heat to their blocks of flats of social housing. Following a series of issues with boiler performance, NerG were asked to investigate what might be causing an issue.
Through on site investigations, it was quickly established that the flues were filling with soot and products of combustion and were in desperate need of a thorough clean in order for them to return to proper working order. The largest chimney at Stockport rises 20 stories to a height of circa 60 metres and has a diameter of 600mm. In addition, many of the flue systems have significant horizontal runs. These are actually more complicate to clean than the vertical stacks.
NerG were asked to carry out a thorough cleaning of all flues. TO do this we used our specialist equipment which enables us to clean the chimneys thoroughly whilst minimising the mess caused by the soot removed from the chimney.
Following a full clean down of each chimney, NerG re-fired the boilers and went through a combustion analysis to check the correct operation of the boilers. All 9 boilers were bought back to full operational output.
The result of the cleans was that all the boilers returned to full working order. In addition we now have a contract to clean all of the flues twice a year.
The cleanliness of the flue has a significant impact on the operational efficiency of a biomass boiler. The diameters are carefully calculated together with the height to ensure that the flues always draw a negative pressure regardless of whether there is a small or large fire in the boiler. The build up of dusts and soot inside the pipes changes the diameter and can have significant effects on the ability of the chimney to remove the flue gases. This is obviously the fundamental purpose of a flue or chimney and therefore regular cleaning is critical.
In addition NerG own the specialist equipment to cope with flues that have been used with boilers that have not been configured correctly. Flue dust should be light and fluffy, however, if the boiler has not been set up correctly, then it is possible to get a build up of tar or creosote type materials on the insides of the flue. This is potentially very dangerous as these materials are flammable and therefore it is possible to end up with flue fires. Our cleaning equipment is capable of mechanically abrading these materials off the insides of the flue.