Limpsfield - Model LC Series - Burner
The Limpsfield LC burner series offers high efficiency burners ranging from outputs of 0.9MW to 31MW (3 – 110 MBtu/hr). All Limpsfield burners provide high turndowns typically between 4:1 and 10:1. This versatile range of burners can be tailor-made to suit any on-site requirements, and fire a vast range of fuels.
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Products Details
Designed and manufactured to exacting speciations, the Limpsfield LC burner line is an exceptional combination of form and function. Every feature, from the powder coated finish to the sealed damper bearings and large viewing port, exemplifies the commitment to quality and performance. With the ability to orient both the fuel and air inlets independently of one another the application possibilities are virtually unlimited.
In addition to being easy to set up and adjust, the unique forced draft combustion design distributes the combustion air in the burner head so that the necessary static pressure is maintained for stable combustion and flame geometry, throughout the complete burner firing range. Therefore the burner achieves less than 3% O2 throughout the complete firing range making the boiler more efficient with low emissions and assist with being “Green”.
Low NOx Applications
All burners are capable of meeting tough US federal codes regarding low NOx emissions. Numerous installations of this nature have been carried out with excellent results.
We believe that in order to meet local codes for low NOx requirements, efficiency should not be compromised; therefore our burners have been designed to operate at sub 30 ppm while operating at 3% O2 or lower throughout the firing range. This is due to the utilisation of flue gas re-circulation and the superior flame retention and mixing achievable from the Limpsfield design.
Low NOx can be achieved by using ‘Flue Gas Recirculation’. This is done by using one of two methods either forced FGR or induced FGR depending on application. FGR is accomplished by forcing the flue gases with a separate fan back into the combustion zone (forced FGR), or by drawing the flue gases through the combustion air fan (induced FGR). Both methods reduce the bulk flame temperature in the furnace to inhibit the chemical reaction between the nitrogen and oxygen. FGR systems reduce NOx emissions without reducing efficiency.
Tailored Applications
Limpsfield will engineer a project to suit the requirements whether it is single fuel, dual fuel, multi fuel, change over on the fly between fuels or burning waste stream fuels. The burner can be supplied as a low NOx burner for both gas and oils.
We have carried out many applications to suit our customers’ requirements and have extensive experience in firing many fuels in a wide range of applications including fire tube boilers, water tube boilers, kilns and dryers.
A selection of successful applications have been listed below:
- Change over on the fly between fuels (no boiler down time between fuel change over)
- Multi-fuel firing
- Burning waste stream fuels
- Combined firing of waste stream fuels with a primary fuel
- Six fuels through one burner without hardware changes
- We also offer a steam or air atomizing oil lance assembly
- Hydrogen
- Propane
- No. 6 Oil with, or without Low NOx
- No. 4 Oil with, or without Low NOx
- Methanol
- Isopropanol
- Toluene
- Bio Gas
- Bio Gas / Natural Gas blends
- Tallow
- Waste Alcohol simultaneous firing with Natural gas or No. 2 oil.
- Stainless steel applications
- High temperature applications
We have engineered projects for many more fuels and applications.
Limpsfield offers a total engineered solution to meet the site application and specification with high performance O2 levels and Low Nox if required.
High Turndown
Benefits
Limpsfield burners provide high turndowns typically between 4:1 and 10:1. This turn down is established by using a split gas head or a spider head. The split gas head can be used on most applications and provides excellent mixing to maintain good combustion throughout the firing range.
The unique spider head assembly offers the user high turn down ratios. It was initially designed to be fired when using fuels with high burning velocities such as Propane or Hydrogen. Unlike the split head, the fuel is introduced after the diffuser plate enabling the flame to establish good retention whilst maintaining excellent mixing.
Limpsfield will design and engineer the correct solution to suit your application.
An example of Limpsfield’s in-depth engineering capabilities;
This spider head assembly was for an application where Hydrogen was produced on-site as a bi-product of a chemical reaction. The heads construction is such that the fuels are supplied from two individual gas trains to separate gas controlvalves, one on either side of the burner. The diffuser view shows two different sizes of main injector, these are used in order to accommodate the differences in the flame velocity of hydrogen and propane.
Limpsfield burners have been designed to ensure minimal emissions are released into the atmosphere. This means less harmful emissions are created, but also means greater eciency of the burner due to good combustion which in turn creates great fuel savings. Typically Limpsfield burners operate at <3% O2 and <10ppm of CO. These figures continue throughout the firing range, from low fire to high fire.
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