Ancillary Equipment
We manufacture all required ancillary equipment for the boiler house including boiler water feed systems, fuel feeders, emission abatement equipment, ash conveyers, and steam reticulation systems. To find out more click on the buttons below.
Boiler Feed Water Systems
The boiler feed water is one of the most important aspects in the boiler house but is often overlooked. At a minimum, the system must include high pressure feeds pumps, level control, and a water storage vessel.
We offer multi-stage high pressure feed pumps suitably sized to handle the full capacity and design pressure of the boiler
Boiler level control is by way of a Mobrey Controller which can offer an on/off facility for smaller boilers, to full modulating for the larger units.
We also provide suitably sized feed water tanks (Hotwell tanks), insulated and metal clad, fitted with sparge pipes in cases where condensate return is absent.
As part of the overall boiler water control sytem, we also offer manual or automatic blowdown facilities, ranging from intermittent to continuous, as required.
Our blowdown tanks are of the submerged type, built in concrete and normally part of the civil engineering section of the overall boilerhouse. Water temperature and content is monitored before being discharged into the local authoritiy effluent system.
We also have a range of steel blowdown pressure vessels where the site conditions demand.
Water treatment plant is often provided by the customer’s existing suppliers. We can however offer a range of RO plant to meet the most exacting requirements.
Of special mention are our atmospheric and pressure spray deaerators which can drastically improve the performance of your boiler. Follow the links below for more details.
Fuel Feed Systems
Our boilers are designed to handle a range of fuels depending on your requirements. Coal fired boilers are the most popular due to the low initial cost as well as running costs, they are however not ideal for on demand steam and take a while to heat up. Oil fired (HFO and LFO) burners are prefect for small batch operations and better monitoring of the steam demand. Existing coal fired boilers can be modified to take a HFO or LFO burner. However as the world turns to more environmentally sustainable fuels, coal and oil is becoming less desirable. As a result we have developed a cyclonic burner as well as waste fuel burners to use as an alternative or supplement to coal and oil.
Chaingrate Stoker
As the flagship of our boilers the Stirling Mk 7 boiler comes fitted with our standard Cochrane Chaingrate Stoker. Our largest standard stoker efficiently consumes over one tonne of fuel an hour on specialised wide design links.
Being one of the hardest worked components of any shell boiler the stoker is of rugged design. It is built on a rugged fabricated steel frame, which houses the undergrate air distribution system. The links are of wide design for maximum strength and service life and are made up of only two types, a drive link and a common link. Link rods are of the fully floating type and do not require belling or fitting of washers and split pins but are retained by guide strips and can be easily changed. The drive links engage with solid high grade cast iron drive sprockets keyed to the drive shaft. Side seals are in heat resisting cast iron or carbofrax as preferred.
Combustion air is provided by means of balanced draught equipment controlled by either a single lever control unit, or as an optional extra, a solid state type electronic controller.
These devices correctly adjust the induced draught dampers, forced draught damper and stoker motor speed for the most efficient combustion conditions. Efficiencies at full rated capacity of up to 79% are attainable with washed pea coal having a gross calorific value of 29000 kJ/kg (29 MJ/kg).
It is built on a rugged fabricated steel frame, which houses the undergrate air distribution system. The links are of wide design for maximum strength and service life and are made up of only two types, a drive link and a common link. Link rods are of the fully floating type and do not require belling or fitting of washers and split pins but are retained by guide strips and can be easily changed.
The drive links engage with solid high grade cast iron drive sprockets keyed to the drive shaft. Side seals are in heat resisting cast iron or carbofrax as preferred.
Waste Fuel Burners
Due to the increasing demand to use more sustainable fuels to fire boilers, we have a variety of options to choose from depending on the fuel to be burnt. We can manufacture Dutch Ovens, Fixed Grates, and a Cyclonic Burner designed by E Cochrane & Associates. The most popular system is the multi feed screw system which provides a Live Bottom Bunker feature free from bridging and `rat holing’ and are controlled by variable speed geared motors from a suitable PLC.
The cyclonic burner is the most efficient. The waste fuel (cotton seed husks, wood chips, wheat husks) is blown into the cyclonic burner by means of tangential inlets which ensures total combustion of the feedstock.
HFO or LFO Burner
HFO and LFO burners are useful especially for standby boilers or boilers that only need to run for a short period of time. They are more responsive to the steam demand but can become costly. There is a large choice of proprietary burners available on the market and our customers can indicate their preference.
Emission Abatement Systems
Around the world governments are tightening the air pollution requirements in a bid to reduce carbon emissions. We have multiple options available to assist with the reduction of pollution from our boilers.
On exiting our boilers, the flue gases are transported through fabricated ducting enroute to either free-standing or boiler mounted chimneys.
Our Induced Draught Fans produce sufficient pressure to drive the gases through our standard Multi-Cyclones, reducing the entrained grit to an acceptable limit.
Should lower emissions of grit and NOX be required we can design plant to handle this; ELECTROSTATIC PRECIPITATORS for larger boiler installations and when applicable, a WET GAS SCRUBBER of the cascade contra flow design can be offered.
These systems can also be applied to other hot gas trains where grit emissions are a concern.
Our Coal fired Boilers can be fitted either with a standard dry ash removal system or a wet submerged conveyer system for the larger boiler houses. Up to two or three of our twin flue boilers can be simultaneously de-ashed in this way, moving upwards of one tonne per hour of ash into an overhead storage bin, ready for transport off site.
Steam Reticulation
We can design, manufacture and instal suitable steam and condensate pipework to suit any of our boiler installations.
Our Quality Assurance department will oversee the appropriate Non Destructive Testing requirements.
Control Systems
We provide fully functional control panels to easily operate our boilers. These are either manual panels controlled by relays and designed in house, or fully automatic panels through our partners at Dryden Combustion.
The fully automatic panels provide a system for optimal steam control, boiler efficiency, boiler preservation, and reduction in environmental impacts.
Both the manual and automatic panel follow the same philosophy of an ID led system ensuring the boiler runs at its best at all times.
