Wiktor Wise
Biomass is an important fuel in many countries, especially developing ones, for cooking, heating, and electricity generation. It is defined as any organic material or waste containing chemical building blocks like carbon and hydrogen. These building blocks are vital to our modern energy and materials economy. Biomass can be converted to energy through various processes, including direct combustion, bacterial decay, and conversion to gas/liquid fuel. The most common method for converting biomass to energy is direct combustion, where biomass is burned in a boiler to produce high-pressure steam, which then rotates a turbine to drive a generator, producing electricity.
| Characteristics | Values |
|---|---|
| Definition of Biomass | Any organic material or waste that contains chemical building blocks like carbon, hydrogen, and other components that are vital to our modern energy and materials economy |
| Sources of Biomass | Wood and wood processing waste, agricultural crops and waste materials, biogenic materials in municipal solid waste, animal manure and human sewage |
| Methods of Converting Biomass to Electricity | Burning, bacterial decay, conversion to gas/liquid fuel, direct combustion, gasification, pyrolysis, co-firing |
| Advantages of Using Biomass | Biomass is a sustainable and renewable source of energy, it does not increase the amount of carbon dioxide in the atmosphere, it can be used to offset the intermittent supply of other renewable energy sources, it offers cost savings in terms of reduced raw material procurement and operating costs |
| Disadvantages of Using Biomass | High transportation costs if biomass is sourced from distant areas, land use considerations, replanting and clearing concerns with certain materials like firewood |
| Examples of Biomass Use | The industrial sector, transportation sector, residential and commercial sectors, electric power sector |
| Biomass Equipment | Front loaders, automated stackers, reclaimers, chip bunkers, silos |
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What You'll Learn
Burning biomass to generate electricity
Direct combustion, the most common method for converting biomass to energy, is used to burn biomass and generate electricity. Biomass includes organic waste material, such as animal dung or human sewage, as well as plants, wood, paper, and lumber mill waste.
Biomass is burned in a boiler to produce high-pressure steam. This steam flows over a series of turbine blades, causing them to rotate. The rotation of the turbine drives a generator, producing electricity. This process is similar to those used with fossil fuels.
Drying the biomass before combustion improves efficiency but may not be economically viable. The combustion process also produces by-products that are vented to the environment. Emission controls are necessary to limit hazardous air pollutants, depending on fuel properties and local, state, and federal regulations.
In the United States, direct combustion systems take the form of stationary and traveling-grate combustors, also known as fixed-bed stokers and atmospheric fluidized-bed combustors. These combustors burn biomass to heat water in a boiler and create steam, which drives a turbine generator to make electricity. The excess steam can also be used for manufacturing processes or to heat buildings.
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Using bacterial decay to create fuel
Bacterial decay is one of the three methods to release the energy stored in biomass to produce biopower, the other two being burning and conversion to gas/liquid fuel. Organic waste material, such as animal dung or human sewage, is collected in oxygen-free tanks called digesters. In these digesters, anaerobic bacteria break down the material to produce methane and other byproducts, forming a renewable natural gas. This gas can then be purified and used to generate electricity.
Microbial fuel cells (MFCs) are used in water treatment to harvest energy utilizing anaerobic digestion. MFCs produce electric current by the bacterial decomposition of organic compounds in water. The bacteria in MFCs transfer their electron production via the pili on their external membrane. The first MFCs, demonstrated in the early 20th century, used a mediator to transfer electrons from the bacteria in the cell to the anode. Unmediated MFCs, on the other hand, use bacteria with electrochemically active redox proteins on their outer membrane to directly transfer electrons to the anode. MFCs can also be used to treat wastewater and reduce pathogens, but they require temperatures above 30°C and an extra step to convert biogas to electricity.
Soil-based MFCs use soil as the nutrient-rich anodic media, the inoculum, and the proton exchange membrane (PEM). The anode is placed at a specific depth within the soil, while the cathode rests on top of the soil and is exposed to air. Soils naturally contain a variety of microbes, including electrogenic bacteria necessary for MFCs, and complex sugars and other nutrients derived from plant and animal material decay. MFCs that do not use a membrane can deploy anaerobic bacteria in aerobic environments, but they may experience cathode contamination by indigenous bacteria.
In addition to MFCs, bacterial decay can also produce bio-oil through pyrolysis. Pyrolysis is a thermal decomposition process where biomass is heated at high temperatures in a closed, pressurized vessel with little to no oxygen. The resulting bio-oil can be used in boilers and furnaces for electricity generation.
Scientists are also exploring the use of bacteria to create alternative fuels to fossil fuels. For example, researchers have found a way to generate renewable propane using a bacterium found in the human intestine. By using enzymes to redirect fatty acids, the bacteria produce engine-ready renewable propane instead of cell membranes. While the current production levels are too low for commercial use, the concept has been proven, and researchers are working to refine the process. In another instance, a team of scientists is working to engineer bacteria to produce large quantities of POP molecules from plant waste food sources, potentially creating a carbon-neutral fuel.
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Gasification of biomass
Gasification is a process that converts biomass into electricity. It involves heating organic materials to high temperatures (>
The process of gasification can be applied to a wide range of biomass feedstocks, including wood pellets and chips, waste wood, agricultural and industrial wastes, sewage sludge, and crop residues. The raw materials for biomass gasification are various and abundant, including wood processing waste, agricultural residues such as sawdust, branches, crop straw, and corncobs.
Biomass gasification power generation typically involves three processes: biomass gasification, gas purification, and gas power generation. During gasification, the biomass is burned and gasified into combustible gas through a chemical reaction at high temperatures. The gas is then purified to remove impurities such as ash, coke, and tar. Finally, the purified gas is burned in a gas turbine or an internal combustion engine to generate electricity.
Biomass gasification has several advantages. It is a mature technology with a flexible and simple power generation process that can be applied to small-scale production. It can also provide a wider variety of output fuels compared to other biofuel technologies. Additionally, biomass gasification can have low net carbon emissions, especially when coupled with carbon capture and storage, as the carbon dioxide removed from the atmosphere by growing biomass offsets the emissions from gasification and combustion.
However, there are also challenges associated with biomass gasification, such as the power consumption and indirect CO2 emissions during the gasification and syngas conversion processes. Additionally, capital equipment and biomass feedstock costs can be significant, and improving agricultural practices and breeding efforts may help stabilize feedstock costs.
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Pyrolysis of biomass
Pyrolysis is one of the technologies available to convert biomass into an intermediate liquid product that can be refined to produce hydrocarbon biofuels, fuel additives, and petrochemical replacements. Pyrolysis involves heating organic materials, such as biomass, in a closed, pressurised vessel called a gassifier, in the absence of oxygen. This causes the biomass to thermally decompose into combustible gases and bio-char. The process is usually conducted at or above 500 °C, providing enough heat to break down the strong bio-polymers found in the biomass.
Most of the gases produced by pyrolysis can be condensed into a combustible liquid called pyrolysis oil or bio-oil. However, there are some permanent gases, such as CO2, CO, H2, and light hydrocarbons, some of which can be used to fuel the pyrolysis process. Thus, pyrolysis of biomass produces three products: one liquid and two gases. The liquid bio-oil can be difficult to distill or refine further due to its chemical composition, so additional research is needed to improve its quality.
Bio-oil is more cost-effective to transport than biomass due to its higher density. This has led to the idea of a distributed processing model where small-scale pyrolyzers could convert biomass to bio-oil, which could then be transported to a central location for refining. This hypothesis has been tested with a mobile one-ton-per-day pyrolysis demonstration unit called the combustion reduction integrated pyrolysis system (CRIPS).
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Biomass as a sustainable energy source
Biomass is a sustainable energy source that can be used to generate electricity. It is defined as any organic material or waste containing chemical building blocks like carbon and hydrogen, which are vital to our modern energy and materials economy. Trees and plants absorb energy from the sun through photosynthesis, trapping it inside until the organic material is converted into energy and materials.
There are several types of biomass, including agricultural residues, purpose-grown energy crops, and wood. For hundreds of thousands of years, humans have used wood or wood-derived charcoal as fuel for heating and cooking. Today, firewood, wood pellets, and wood chips are still used for heating, and wood is also used to generate electricity. The industrial sector accounts for the highest total annual US biomass consumption in terms of energy content and percentage share. The wood products and paper industries use biomass in combined heat and power plants to generate electricity for their own use.
Biomass can be converted into energy through various processes, including direct combustion, thermochemical conversion, gasification, and pyrolysis. Direct combustion is the most common method, where biomass is burned to generate electricity in steam turbines. Gasification and pyrolysis are thermal decomposition processes where biomass is heated at high temperatures in closed, pressurized vessels called gasifiers. The main difference between these two processes is the temperature and the amount of oxygen present during conversion. Gasification produces a carbon monoxide- and hydrogen-rich gas called synthesis gas or syngas, which can be burned in a conventional boiler to produce electricity. Pyrolysis, on the other hand, produces bio-oil, which can be used in boilers and furnaces.
Biomass has several advantages as a sustainable energy source. It does not increase atmospheric carbon dioxide levels because the carbon in biomass is already part of the natural carbon cycle. Biomass plants can also be more cost-effective due to reduced raw material procurement and operating costs. Additionally, biomass can offset the intermittent supply of other renewable energy sources like wind and solar, which are dependent on weather conditions. However, there are also challenges to consider, such as transportation costs and land use.
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Frequently asked questions
Biomass is any organic material or waste that contains chemical building blocks like carbon and hydrogen. It is the single largest supply of carbon on Earth and is a sustainable and renewable energy source. Examples of biomass include agricultural crops and waste materials, biogenic materials in municipal solid waste, and animal and human waste.
There are several processes to convert biomass into electricity. The most common method is direct combustion, where biomass is burned to produce heat and electricity. Another method is bacterial decay, where organic waste material is collected in oxygen-free tanks and decomposed by anaerobic bacteria to produce methane and other byproducts that form a renewable natural gas, which can be purified and used to generate electricity. A third method is the conversion of biomass to gas or liquid fuel through gasification and pyrolysis, which can then be burned in a boiler or furnace to produce electricity.
Biomass is a renewable and sustainable energy source that does not increase the amount of carbon dioxide in the atmosphere. It can be used to generate electricity in a programmable and continuous manner, offsetting the intermittent supply of other renewable energy sources such as wind and solar power. Additionally, biomass power plants have cost-saving aspects related to reduced raw material procurement and operating costs, especially when using waste residue as fuel.
Some disadvantages of using biomass for electricity generation include the potential impact on the environment, such as the clearing and replanting of forests in the case of firewood. Transportation costs can also be high if the biomass source is located far from the power plant. Additionally, the use of dedicated crops for biomass production may raise concerns about land use and food security.
