Drawing on its international expertise as an equipment manufacturer and a contractor, CNIM supplies turnkey treatment and energy recovery centers for domestic and non-dangerous/non-hazardous industrial waste. Such waste includes Solid Recovered Fuel (SRF) and contaminated biomass, among other elements. The Group’s various operations are fully integrated in an approach that begins with designing the key equipment, ordering and then monitoring the works carried out by partners or sub-contractors, and then commissioning the new plant. Depending on the project configuration, CNIM can also work with partners to supply only the equipment at the heart of the waste-to-energy combustion and flue gas treatment processes. CNIM has the expertise and advanced production capacity needed to support clients throughout the project life cycle. The Group’s activities are closely aligned with the principles of the ‘circular economy’ and feature a range of clean technologies that have been developed internally. Continuously updated and renewed, these technologies meet the highest standards of performance and respect for the environment.
CNIM provides the detailed design of the following elements:
For domestic or industrial/associated waste, CNIM deploys a CNIM/Martin reverse acting grate. As part of its combustion technology, the Group uses reverse acting grate supplied by Martin GmbH, a CNIM partner for more than 60 years. Installed in 90% of the world’s energy recovery plants, combustion grates are the most tried and tested technique for heat recovery. The unique aspect of the CNIM/Martin process is that the bars of the grate move in the opposite direction to the downward gravitational pull of the waste. The approach is not only a highly efficient method of mixing the combustible material, it also provides permanent protection of the underlying equipment – as it ensures there is a thick, insulating layer of waste covering the grate. The embers at the top begin the combustion process of the waste as soon as it arrives on the grate, while the significant loss of pressure across the grate ensures there is a homogenous distribution of air during combustion.
The process is well-established, robust and long-lasting; and it can handle a variety of combustible materials with a wide range of net calorific values (NCVs):
- Combustion is complete, despite the heterogeneous nature of the waste, with a low level of unburned material in the bottom ash
- The amount of unburned CO-type gases is extremely low
- Availability of the equipment is high, and its lifetime is long
- CNIM also provides other combustion systems, according to the type and physical characteristics of the material to be incinerated (such as a mixture of coal and biomass, or contaminated biomass, etc). These alternatives include fluidized bed combustion and Ignifluid™ combustion grates.
A heat-recovery boiler is integrated within the incinerator, which makes it possible to provide cooling for the incinerator itself, prevent obstructions from building up and avoid any loss of performance in the connecting ducts. The boilers produced by CNIM are designed to cope with the build-up of residues and the corrosive effects of flue gases produced by the thermal treatment of domestic waste. Specifically, the boilers guarantee:
- high levels of thermal performance
- long-lasting heat exchange surfaces
- lengthy operating periods without the need for manual cleaning
The particular type and characteristics of the thermal cycle all depend on the use for which the recovered energy is destined. Recovery can take the form of heat – to supply urban heating networks or steam for industrial use. It can also be transformed into electricity, which can be delivered externally – with a small amount of the electricity generated being retained for use by the plant itself. The ratio of these two different forms of energy can be modulated according to actual needs, seasons and times of day. This is known as cogeneration.
Treatment of flue gases by LAB
Whether the waste is domestic, industrial or contaminated biomass, the CNIM Group company LAB uses the same basic processes for treating flue gases. Whatever the source of the waste material, the levels of liquid, solid or gas emissions from the plant are far below the limits permitted by even the most demanding environmental regulations.
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