Unit 4: Thermal Conversion Technologies
Expert-defined terms from the Professional Certificate in Waste-to-Energy Conversion course at London School of Business and Administration. Free to read, free to share, paired with a globally recognised certification pathway.
Anaerobic Digestion #
A biological process that breaks down organic matter in the absence of oxygen, producing biogas (a mixture of methane and carbon dioxide) and digestate (a nutrient-rich organic fertilizer). Related terms include biogas, digestate, and biomethane.
In the context of waste #
to-energy conversion, anaerobic digestion is a key technology for converting organic waste into usable energy. By breaking down organic matter in a controlled, oxygen-free environment, anaerobic digestion produces biogas, which can be used as a fuel for generating electricity and heat. The digestate produced by the process can also be used as a fertilizer, reducing the need for chemical fertilizers and promoting sustainable agriculture.
Biogas can be upgraded to biomethane, which has a similar composition to natural… #
Anaerobic digestion can also help to reduce greenhouse gas emissions by capturing methane, a potent greenhouse gas, and converting it into a usable form of energy.
Challenges associated with anaerobic digestion include the need for careful moni… #
However, with proper design and operation, anaerobic digestion can be a reliable and sustainable technology for converting waste into energy.
Combustion #
A chemical reaction between a fuel and an oxidizer (usually oxygen) that releases heat and light. Related terms include incineration, fluidized bed combustion, and grate combustion.
Combustion is a common technology for converting waste into energy, particularly… #
In an incineration process, waste is burned in the presence of oxygen to produce heat, which can be used to generate steam and drive a turbine to produce electricity. Fluidized bed combustion and grate combustion are two types of combustion technologies commonly used in waste-to-energy applications.
Fluidized bed combustion involves suspending a bed of solid particles in a strea… #
Grate combustion, on the other hand, involves feeding waste onto a moving grate, where it is burned in a controlled manner to maximize energy recovery and minimize emissions.
Combustion technologies can be highly efficient, with some waste #
to-energy plants achieving conversion efficiencies of up to 30%. However, they can also produce emissions, including carbon dioxide, nitrogen oxides, and sulfur dioxide, which must be carefully controlled to meet environmental regulations.
Gasification #
A thermal conversion process that converts organic matter into a syngas (a mixture of hydrogen, carbon monoxide, and other gases) by heating it in a limited oxygen environment. Related terms include pyrolysis and plasma gasification.
Gasification is a promising technology for converting waste into energy, particu… #
By heating organic matter in a limited oxygen environment, gasification produces a syngas that can be used as a fuel for generating electricity and heat.
Pyrolysis is a type of gasification that occurs in the absence of oxygen, produc… #
Plasma gasification is a more advanced form of gasification that uses a high-temperature plasma arc to break down waste into its component elements, producing a syngas that can be used to generate electricity and hydrogen.
Gasification technologies can be highly efficient, with some plants achieving co… #
However, they can also be more complex and expensive to build and operate than other waste-to-energy technologies. Additionally, the syngas produced by gasification must be carefully cleaned and conditioned before it can be used as a fuel, which can add to the overall cost and complexity of the process.
Landfill Gas #
A mixture of methane and carbon dioxide produced by the anaerobic decomposition of organic matter in landfills. Related terms include landfill methane and landfill biogas.
Landfill gas is a significant source of methane, a potent greenhouse gas that co… #
However, it can also be a valuable source of energy if captured and used as a fuel. By installing a system of wells and pipes, landfill gas can be extracted from a landfill and used to generate electricity and heat.
Landfill gas can also be upgraded to biomethane, which has a similar composition… #
However, the composition of landfill gas can vary widely depending on the age and composition of the waste in the landfill, which can make it challenging to use as a consistent and reliable fuel source.
Pyrolysis #
A thermal conversion process that breaks down organic matter in the absence of oxygen, producing a solid char, a liquid, and a gas. Related terms include gasification and plasma pyrolysis.
Pyrolysis is a promising technology for converting waste into energy, particular… #
By heating organic matter in the absence of oxygen, pyrolysis produces a solid char, a liquid, and a gas. The solid char can be used as a fuel or a soil amendment, while the liquid can be refined into chemicals or fuels. The gas can be used as a fuel for generating electricity and heat.
Plasma pyrolysis is a more advanced form of pyrolysis that uses a high #
temperature plasma arc to break down waste into its component elements, producing a syngas that can be used to generate electricity and hydrogen.
Pyrolysis technologies can be highly efficient, with some plants achieving conve… #
However, they can also be more complex and expensive to build and operate than other waste-to-energy technologies. Additionally, the solid char, liquid, and gas produced by pyrolysis must be carefully conditioned and separated before they can be used as fuels or other products, which can add to the overall cost and complexity of the process.
RDF #
Refuse-Derived Fuel, a fuel produced by shredding and dehydrating municipal solid waste. Related terms include solid recovered fuel and waste-derived fuel.
RDF is a fuel made from municipal solid waste that has been shredded and dehydra… #
The resulting fuel is typically composed of plastic, paper, and other organic materials, and can be used in cement kilns, power plants, and other industrial applications.
RDF is a promising technology for reducing waste volumes and recovering energy f… #
However, it can also be more complex and expensive to produce than other waste-to-energy technologies, and may require significant upfront investment in equipment and infrastructure.
Thermal Conversion Technologies #
Technologies that convert waste into energy through the application of heat. Related terms include waste-to-energy, incineration, gasification, pyrolysis, and anaerobic digestion.
Thermal conversion technologies are a group of technologies that convert waste i… #
These technologies include incineration, gasification, pyrolysis, anaerobic digestion, and others. The goal of thermal conversion technologies is to recover energy from waste while minimizing emissions and other environmental impacts.
Thermal conversion technologies can be highly efficient, with some plants achiev… #
However, they can also produce emissions, including carbon dioxide, nitrogen oxides, and sulfur dioxide, which must be carefully controlled to meet environmental regulations. Additionally, thermal conversion technologies can be more complex and expensive to build and operate than other waste-to-energy technologies.
Waste #
to-Energy: The conversion of waste into energy through thermal or biological processes. Related terms include thermal conversion technologies, incineration, gasification, pyrolysis, and anaerobic digestion.