Q & A > Question Details
What are the ways of cleaning fired fuel gas burners online?
The heater is fd fan type and fuel gas is used.
Also, what are the factors that could reduce its efficiency?
26/07/2018 A: Peter Marsh, XBP Refining Consultants Ltd, peter.marsh@xbprefining.co.uk
Latest generation low NOx burners are particularly prone to fouling because they have multiple gas tips with relatively small diameter drilled gas ports. Fouling deposits may include ammonium salts, iron salts, coke, etc. The best solution for maintaining burner efficiency is to install a skid-mounted fuel gas conditioning system between the fuel gas KO drum and the ESD valves. This typically comprises a droplet separator, a particulate filter, a coalescer, a steam heater and heat traced, thermally insulated fuel gas piping (to keep the fuel gas above its dew point). All burners should have a quick-acting, quarter turn tight shut off isolation valve to allow isolation of individual burners for cleaning or repair with the fired heater on line. However, mechanical cleaning with wire brush or re-drilling ports is quite labour intensive and time consuming. If the fouling deposits are chloride salts and are not oil-soaked or coked, injection of steam or intermittent injection of a strongly basic chloride scavenger chemicals into the fuel gas supply can provide effective on-line cleaning of burner tips without having to remove individual burners.
26/07/2018 A: NS Murthy, Suez, murthy.ns.ext@suez.com
I have seen some refineries have steam / heat tracing of fuel gas line to prevent condensate accumulation (specially during rainy days) which in turn help to make tip cleaner from carbon deposit. Another area worth looking at is the amine loss in your refining complex as any entrained amine will be in fuel gas system which in turn can create such tip fouling.
24/07/2018 A: Lindsay McRae, Pall Corporation, Lindsay_McRae@pall.com
If a row of burners can be isolated and removed for mechanical cleaning row by row then cleaning without furnace shutdown may be possible depending ont eh furnace design however if the burners are fixed or there is just a single large burner then a furnace shutdown may be required to clean the burner.
It is usually preferable to have a good quality Fuel gas coalescer installed close to the point of use to remove liquid and solid contaminants from fuel gas o protect the burner from fouling and prevent unstable flame patterns. Its far easier to change out a coalescer element than it is to clean burners and implement a regular burner cleaning routine. Particularly for low NOX and Ultra low NOX burners good fuel gas treatment is essential and this can almost eliminate burner cleaning between turnarounds.