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Fuel handling and metering systems, combustion management systems, flue gas treatment systems, ash handling systems, emissions monitoring and control systems, deaerators, boiler feedwater pumps and condensate pumps, chemical dosing and sampling systems, blowdown tanks, and all electrical, instrumentation and boiler controls necessary to operate the boiler safely and efficiently are available.

Nooter/Eriksen custom designs every grate boiler to optimize performance, efficiency and your unique plant layout requirements. We strive to understand your grate boiler needs and provide a solution that works for you.

From the smallest to the largest installations, our natural circulation designs are available in Horizontal or Vertical layouts in capacities up to 150t/h (331 kpph), with steam temperatures from saturated to 565掳C (1050掳F) and pressures up to 150barg (2,175psig). Units can be bottom or top supported to better serve the project.

We specialize in the efficient recovery of energy from the combustion of waste materials (special waste, industrial waste, refused derived fuel and solid urban or municipal waste) and biomass fuels (raw wood, wood chips, agricultural residuals, and so on).

Across the various applications and industries, the combustion challenges are similar: High moisture content of the fuel, toxic chemicals (like chlorides, dioxin), low calorific value of fuels (8000-18000 kJ/kg or 3,400-7,750 BTU/lb) that can lead to flame instability (i.e. high emission levels) and operation at part loads (normally 60-70% of maximum load is the minimum achievable). Nooter/Eriksen engineers are ready to face these challenges to meet your plant needs.

Fuel Feed

When speaking about biomass or waste combustion, an essential parameter is the flame stability. It鈥檚 very important to assure safe operating conditions and to reduce the environmental impact in terms of emissions. Nooter/Eriksen has a vast experience in handling a multitude of different fuels.

We can identify a 鈥渟tability region鈥� considering calorific value of the fuel, fuel mass flow and heat input. It is clear that the operating range of the grate burner is about 65-100%, largely lower than the one of a natural gas burner (10-100 % load operational range).

Heating surfaces cleaning

The external surfaces of tubes constantly need to be kept clean from ash, removing slagging and fouling deposits, ensuring a good heat transfer.

For boiler burning solid fuels, soot-blowers that inject pressurized air or steam might not always effective, thus other systems could be installed as:

Flue Gas Treatment and Emission Control

Control of pollutant鈥檚 emissions is one of the most important design parameters. Nooter/Eriksen can design and supply the complete emission control system. Main emission parameters to be controlled are:

High content of organic nitrogen may produce high level of NOx. Injection of ammonia (NH3) or Urea at the end of the furnace shall reduce NOx at high temperature, typically 900-1000 掳C (1650-1830掳F), utilizing a Selective Non Catalytic Reactor (SNCR). Depending on NOx and SOx level required, also a Selective Catalytic Reactor (SCR) can be installed at low flue gas temperature i.e. 350-300 掳C (660-570掳F).

CO and unburned carbon can be reduced by optimizing combustion process. Besides that, activated carbon filter can be installed particularly for organic carbon reduction and HCl, HF.

Dioxins are formed at medium temperatures during combustion process and are destroyed at high temperatures: Nooter/Eriksen design guarantees the required residence time inside combustion chamber to eliminate Dioxins (more than 2 seconds). When required a natural gas post-firing burner will be installed at the bottom of the combustion chamber to maintain the furnace outlet temperature higher than 900掳C (1650掳F).

Dust and particulate content are extremely significant and must be reduced before fuel gas exits the main stack. This is accomplished installing in the flue gas path the following devices:

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