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  5. LAWI - Model EtaComb - Combustion & ...

LAWI - Model EtaComb -Combustion & Moving Grate Firing Systems

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Biomass and solid wastes are available in large quantities almost all around the world and its thermal utilization is an efficient approach of not only carbon neutral electricity generation but also waste management.

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Biomass and other solid wastes, especially in multi-fuel applications, are non-homogeneous fuels, which vary in size, heating value and moisture. Hence, control of the combustion (also called furnace, incinerator, stoker) is essential for an efficient thermal utilization and therefore, the combustion system is the heart of every power plant of this kind. The combustion system is the most essential part in terms of efficiency and feedstock flexibility and is significantly responsible for the overall performance, because in it the feedstock is converted into thermal energy which can be further used for different purposes.

Why choosing a LAWI EtaComb® installation? The strategic technical development goals of LAWI Engineering have always been guided by the challenge of how to increase the efficiency and the flexibility of thermal solid waste utilization.

Over the last years of intense R&D we have combined our experience from 20 years of designing multi-fuel combustion systems & incinerators with moving grate technology and created the German patented LAWI EtaComb® of today. It was successfully installed in more than 40 projects in different countries across the world and proved to have a convincing combination of strong points and resulting benefits.

Biomass & WtE Combustion Systems

The requirements towards solid waste combustion systems are continuously increasing. Modern combustion systems are required to be not only efficient, robust and capable of utilizing multifuel applications but also to have the least possible environmental impact. Thus, releasing least possible emissions which requires full control of the entire combustion process.

The LAWI EtaComb® combustion systems are LAWI`s answer to these challenges and provide a top-tier solution for the efficient utilization all sorts of solid wastes such as all kinds of biomass, municipal solid waste (MSW), industrial wastes and recovered fuels such as RDF and SRF. As a competent solution provider LAWI is well aware of the fact that specific plant configuration cannot be transferred to every other project due to project-specific requirements.

Therefore, LAWI develops a customized combustion system application together with each of our customer to specifically address each project requirement and to implement the perfect matching solution either on turn-key basis or on individually optimized scope of work – but it is always a LAWI EtaComb®.

EtaComb® Advance - LAWI`s Flagship

The flagship of the LAWI firing systems is the LAWI EtaComb® Adiabatic - A high efficiency multi-fuel combustion system in which the conversion of solid fuels to heat takes place in a controlled and isolated adiabatic combustion. The LAWI EtaComb® Advance is available with different design features and can be applied in various applications and industries.

EtaComb® Direct Firing
The LAWI EtaComb® Direct Firing - LAWI`s answer to applications with high calorific value fuels, homogenous single fuels or limited space requirements. The LAWI EtaComb® Direct Firing system is designed to be integrated into steam boilers and thermo-oil boilers and allows a controlled combustion process within or partly within the boiler radiant chamber.

Efficiency
A high plant efficiency increases the income from energy sales. Especially in terms of additionally procured fuels, every percentage point in efficiency represents a few months shortened pay-back time of investment.
Flexibility
Due to its natural origin, solid biomass or municipal solid waste are not homogenous. Wet, dry, coarse, fine, or contaminated with inert materials, the flexible multi-fuel LAWI EtaComb® Combustion Systems offer a wide range of options for firing the various fuel qualities with high reliability.
Emission
Even ambitious CO- and NOX-values may be guaranteed. The innovative exhaust gas recirculation system reduces the heat losses of exhaust gas at stack and reduces the formation of nitrogen oxides (NOX). Furthermore it avoids ash melting difficulties and its potentially expensive consequences, even when critical fuels are used.
Quality of Ash
Dry de-ashing and an outstanding burn-out of the ash can provide a valuable by-product and at least minimizes the costs of disposal.