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Energy Technology

Expert in energy industry, heating & CHP plants Engineering and Consulting

Chemitec Consulting Oy carries out demanding energy and heating & CHP plant projects. We offer services in consulting, design and project management to communities, industries, heating and CHP plants, authorities and organizations. Our office is located in Espoo, but we work with a global clientele.
Chemitec Consulting Oy has personnel with holistic knowhow in heating and CHP plants. On the whole, we have more than 20 years of experience in the field, which ensures skilled and reliable execution of energy studies and designing and implementation of heating and CHP projects. Our personnel has extensive and versatile experience in projects involving flue gas scrubbing and heat recovery from flue gases, as we have carried out more than 50 projects of this kind in Finland, Sweden and Estonia.
Furthermore, Chemitec Consulting Oy provides all-inclusive consulting services in the field of solid recovered fuel (SRF) production. The technical services we offer include detailed SRF production plant design, efficiency optimization for new and existing plants and calculation of material and energy balances. Besides, we offer economic feasibility analyses, such as capital and operating cost calculation including profit and pay-back time, and environmental studies, like carbon footprint evaluation, life cycle assessment (LCA) and emission reduction studies.

What is covered by our knowhow in the field of energy?

  • Development of investment projects
  • Project management
  • Heating and steam units
  • Production of electricity and heat
  • Purification of flue gases and heat recovery from flue gases
  • Environmental permit applications
  • Wastewater treatment processes
  • Utilization of biofuels and waste in energy production
  • Intensification, modernization and analysis of operation
  • Solid recovered fuel (SRF) production plant design and economics

Feedstock:

  • Biowaste – kitchen waste from households, restaurants, vegetable and fruit market etc.
  • Agricultural waste – grass, crops waste/leftovers etc.
  • Manure – cow, buffalo and other animals
  • Slaughterhouse waste – animal, fish etc.

Process

Anaerobic digestion – wet or dry depending on process requirements

Product (s)

  • Electricity
  • Heat
  • Biomethane
  • Compressed natural gas (CNG)
  • Liquefied natural gas (LNG)

Byproduct (s)

  • Biofertilizer (solid form)
  • Biofertilizer (liquid form)

Depending on customer’s requirements anyone or more than one of abovementioned products can be produced.

Brief description of process/solution

After feedstock arrives at the plant it is stored in storages. As first step, feedstock is fed to feed preparation silos where as per need shredding, mixing and homogenizing of the feed is performed. The prepared feedstock is processed in anaerobic digestion based bioreactors. Suitable process conditions  are provided to the process in which bio organism based material fermentation takes place. Depending upon the process requirements, the fermentation can be wet (i.e. with addition of water to biomaterial) or dry (i.e. without water addition to biomaterial). Process conditions mainly include temperature, mixing and retention time of biomaterial in bioreactors. Depending on input biowaste material’s properties (composition, dry matter content) and process requirements (process stability related) anaerobic digestion process can be mesophilic or thermophilic. In mesophilic anaerobic digestion/fermentation process temperature is raised upto 45 °C and in thermophilic anaerobic/fermentation process temperature is raised upto 60 °C.

The biogas produced is further utilized to produce electricity, heat, biomethane, CNG, LNG depending on the customer’s requirements. In order to produce electricity and heat from biogas it is incinerated in combined heat and power (CHP) based gas firing engine. For biomethane production, methane is separated from biogas in gas purification system. Biomethane is used as an industrial fuel replacing natural gas, coal and furnace oil. To produce CNG or LNG, biomethane is compressed or liquefied in gas compression/liquefaction system. CNG/LNG is used as transportation fuel.

After biogas production, digestate (residue) comes out from bioreactors is processed in separation system to separate solid content from liquid content in the form of biofertilizers. This biofertilizer is used as fertilizer for crops, plantation and forestry.

Feedstock

  • Municipal solid waste
  • Household/residential waste
  • Commercial and industrial waste
  • Landfill waste

Process

Mechanical-biological and combustion treatment

Product (s)

  • Electricity
  • Heat

Byproduct (s)

Aggregates/construction material

Brief description of process/solution

Mechanical treatment of MSW:

An effective segregation of the input mixed solid waste into valuable fractions’ streams is pertinent to recover maximum possible value out of waste in the most environmentally sound manner.

First, in the mechanical treatment plant, mixed solid waste is segregated into different resource streams of material by applying series of unit operations. The main unit operations include shredding, screening, air-classification, magnetic and eddy-current separation. As result of mechanical treatment of mixed solid waste, the segregated resource streams of material obtained are:

  • Biowaste fraction
  • Refuse-derived fuel (RDF)
  • Recyclable (metal, glass)
  • Inert material (soil, sand, stone, brick etc.)

After mechanical treatment plant’s operation, the segregated resource streams of material are ready for their further processing transforming each stream into valuable end product.

Anaerobic digestion of biowaste fraction:

More information about Anaerobic digestion of biowaste can be found under Chemitec Solutions for biowaste catalogue

Combustion process:

In the combustion plant, electricity and heat are generated from refuse-derived fuel (RDF). The RDF is produced from mechanical treatment Heating value of RDF is ~10 – 12 MJ/kg. Combustion process is based on bubbling fluidized bed and circulating fluidized technology. The combustion technology is flexible in using several fuel combinations such as RDF, industrial solid wastes, tyre derived fuel, recycled wood, biomass and paper mill rejects. Biogas produced from Anaerobic digestion plant combined heat and power (CHP) based gas firing engine to produce electricity and heat.

Feedstock

  • Forest biomass – branches, leaves, stump chips
  • Agricultural waste – crops straws/leftovers and others

Process

Biomass combustion

Product (s)

  • Electricity
  • Heat

Brief description of process/solution

After biomass arrives at the plant it is stored in storages. As first step, biomass is prepared – shredding, particle size reduction and homogenization and if needed, dried. The prepared biomass is directly fed as fuel to combustion process. Depending on the type, biomass has heating value of 15 – 18 MJ/kg and is considered a good fuel for energy production. Combustion process is based on bubbling fluidized bed and circulating fluidized technology. As a result of combustion process, high temperature and pressure steam is generated in the boiler/furnace which is used in steam turbines to produce electricity and heat. Ash (bottom and fly/filter) maybe utilized in dedicated construction applications. However, this depends on the local rules and regulations on ash utilization.

 

Chemitec in collaboration with Sofi filtration can offer 2 different solutions for purifying water in power plants.

Flue Gas Condensate and Scrubber Waste Water:

Flue gas condensate or scrubber waste water is typically either discharged after it is clean enough to reach the limits which are set in the environmental permit, or reused in the process after purification.

Water can be used for example as a makeup water for boiler or district heating network. Process is often economically feasible since not only water, but as well the heat energy can be preserved.

Hot condensate water is purified and used as a district heating makeup water. The system has the potential of doubling the energy output of the scrubber. The typical payback time of this type of water treatment unit can be less than one year.

Flue gas condensate water treatment unit. 2 x microfilter + hot water reverse osmosis

 

District Heating and Cooling Networks

District heating and cooling water quality plays great importance. Fine particulate matter in the water interfere process sensors, and increase corrosion damaging pipes, boilers, and heat exchangers.

Removal of solid matter and adjustment of optimal water conductivity and pH will prevent corrosion and increase the lifetime of the network.

Industrial microfilter purifying district heating water

A complete solution from industry leaders

Sofi Filtration together with Chemitec Consulting can deliver a complete solution including:

  • Project Feasibility Analysis
  • Engineering and design
  • Main equipment delivery
  • Auxiliary equipment delivery
  • Overall Project Management
  • Commissioning and Start-up Services
  • Life Cycle support

For more information regarding Sofi Filtration technology, please visit www.sofifiltration.com