The use of coal burning Fluid Bed Combustors has become very popular in a multiplicity of process industries where the use of coal as an energy source is preferred due to the remoteness of the location or other financial considerations. The efficient and rapid ignition of the coal is vital to the efficacy of the whole system. To assist in this, a series of high output burners is mounted in the wall of the combustor to fire downwards onto the fluidising sand bed. Once the temperature of the sand has reached the prescribed level, coal is introduced and the burners are kept active until the chamber temperature is high enough for the coal ignition to be self-sustaining. Depending on the type of fuel available, either gaseous or liquid fuel burners can be utilised for this start-up duty.
Pulverised Coal Burners are often used in rotary kilns and dryers. As in the case of the Fluid Bed Combustor, a source of ignition is required to ensure that the PF can reach self-sustaining combustion. The most popular method is to use a specially designed Igniting Lance Burner which is mounted on a Trolley which can be moved into position during start-up and then removed to a safe place once the kiln or dryer can operate on PF alone. In most cases (but not all) these Start-up Burners are Oil fired. Although they are fitted with Flame Failure equipment to ensure safe operation, it is usually not necessary to provide automatic temperature control. This could be included, should the client require it.
Once again, the design and manufacture of a Start-up Burner would be to a client’s specific requirements and carried out under strict quality control to ensure a system that would meet the needs of the exacting environment and application.
Typical customers where The Combustion Group has been involved in these types of applications are Vanchem Vanadium Products, PPC, Lonmin Platinum and Mittal Steel.