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Our chain grate stokers and reciprocating grate stokers are used  together with 1-160 t / h, thermal power of 0.7-112MW for biomass boilers,industrial boilers,garbage power burners, organic heat carrier furnaces, hot air drying furnaces and other relative products.

Biomass combustion system consists of alloy grate,submerged ash conveyor,primary underfire air,hoppers,ash dicharge hopper,foundation,fuel feeder,lower combustion chamber,fuel gas outlet,upper combustion chamer,emergency stack outlet,refractory lining,feed screw conveyor,throat air box for second air.

Biomass Fuels: Waste Green Wood( moisture 50%),Wood Chips, Bark, Sawdust, Forest Waste, Agricultural Waste,fibers (EFB)(moisture 40%) and so on .

Biomass Combustion System Structure

The alloy bars are made using the 28% material chrome , very resistant to both wearing and temperature;the moving grate bars are controlled by dydraulic cylinders while burning biomass fuels in the combustion system. Primary air is fed below the reciprocating grate bar.And the biomass combustion system is build out of refactrory lining, and the thickness of 360mm

The primary air is fed underneath the grate, transported into three or four sealed-off primary air zones and finally through the grate bar perforations into the primary combustion chamber of the furnace. The moving grate-bars are carefully pressed against sides of the furnace by a special spring system, designed to avoid air leakage along the sides.

 

Features:
Handling wide range of biomass fuels including:
Heavy-duty design for long life and reliable operation
Waste Green Wood( moisture 50%),Wood Chips, Bark, Sawdust, Forest Waste, Agricultural Waste,fibers (EFB)(moisture 40%)
High alloy air-cooled grate bars for long grate bar life

Fuel input
Simple and reliable fuel input with a so-called pusher.
The pusher is divided in 2 or 3 separate compartments, each hydraulically controlled, which ensures a uniform and well-controlled fuel flow into the furnace.
Its opening size permits the use of large lump fuels. The pusher connects to a high fuel shaft effectively preventing air leakage.

Combustion chamber
To achieve an optimal combustion of flammable gases, the combustion chamber has been designed to be well balanced, in volume and geometrical structure, to the supply of secondary air.
Contractions are inserted to minimise the risk of letting out unconsumed gasses into the free air.

Refractory
The furnace is build out of thick reinforced steel plates insulated with heat-resistant refractory lining and has a total thickness of 350 mm which insulates from heat-radiation.

Completely automatic ash removal by reciprocating action of grates.
Multiple Zones of undergrate/primary air for optimum temperature distribution, maximum ash burnout
Low emissions through the use of high velocity overfire/secondary air injection and flue gas recirculation for turbulence

High temperatures
The grate plates and the solid beam construction permit a high temperature pre-heating of the primary air.
The furnace is provided with a flue gas recycling system enabling accurate temperature control in order to minimize risk of sintering and enabling combustion of fuels with high heat value. The flue gas recirculation gives increased possibility to decrease the NOx-value.


Adaptivity
The reciprocating grate is designed as a separate unit built-in into the furnace, enabling a simple adaption to existing furnaces of conventional design.



Charging Ram - Hydraulically operated ram feeder forces refuse uniformly into the furnace onto the first burning grate section.
Grates - Cast from a special high chrome/nickel alloy for long life, alternate rows of grates are moving or stationary. The moving grates reciprocate continuously over the stationary grates and push the refuse through the furnace.

This grate will move in reciprocating motion through the hydraulic transmission. It enables the fuel to move uniformly and it carries out the fuel feeding , slag discharging regularly. Our factory produces and supplies this reciprocating grate using very good material such as High Chrome Alloy steel grate bar.
Overfire/Secondary Air - Strategically located to provide turbulence and mixing of the volatile gases to assure complete combustion.
Combustion Air - Is fed to the underside of each grate section. Each section or module has a separate air supply to provide optimum control of air flow.

Roller Bearings - The grate frame is supported on rollers with tapered roller bearings to reduce friction and wear.
Hydraulic Power Cylinders and Control Valves - Are provided for each longitudinal grate section and feed ram allowing each to be individually driven and controlled by a solid state electronic controller.


Refuse Charging Hopper - Refuse is brought from the storage pit to the charging hopper.
Refuse Charging Throat - Refractory lined or water cooled to protect it from the heat of the furnace and insure long service life.
Vertical Drop Off - Is lined with air admitting high chrome/nickel alloy tuyeres.

Reciprocating Grate Biomass Combustion System (burner) has been widely used with rapid development of biomass fuels and ever-increasing garbages in recent years . Because comparing the travelling chain grate ,Reciprocating grate has a greater advantage when burning the fuels such as garbages,  wood ships,palm shells, rice husk, corn cobs, Nuts, palm shells, fibers (EFB) ect.

Automatic Sifting Removal System - Conveys siftings from underneath the ram and each grate section to the discharge end of the unit into the main residue conveyor or hopper.