What is Biomass Energy?
Biomass means all materials which come from living organisms. For instance, waste material of plants and animals, wood, agricultural wastes, dead parts of plants and animals. Since all living organisms contain carbon compounds, biomass has energy stored in the form of chemical compounds. The method of harnessing energy from each one of them could be different. Direct burning of these materials generally causes pollution but could be the cheapest form of energy. Eg. Using wood or dried cow dung cakes as fuel generates a lot of smoke. However, if cow dung is used in biogas plant, clean fuel can be generated. Mostly in villages, all types of biomass are traditionally burnt directly to produce heat. And if modern methods are used, they can be utilized properly.
Lets talk about advantages and disadvantages of biomass energy.
Advantages of Biomass Energy
1) It�s a renewable source of energy.
2) It�s a comparatively lesser pollution generating energy.
3) Biomass energy helps in cleanliness in villages and cities.
4) It provides manure for the agriculture and gardens.
5) There is tremendous potential to generate biogas energy.
6) Biomass energy is relatively cheaper and reliable.
7) It can be generated from everyday human and animal wastes, vegetable and agriculture left-over etc.
8) Recycling of waste reduces pollution and spread of diseases.
9) Heat energy that one gets from biogas is 3.5 times the heat from burning wood.
10) Because of more heat produced the time required for cooking is lesser.
11) Pressure on the surrounding forest and scrubs can be reduced when biogas is used as cooking fuel.
12) It is a more cost effective means of acquiring energy as compared to oil supplies. As oil supplies are getting depleted day by day, it is becoming a costly commodity.
13) Growing biomass crops use up carbon dioxide and produces oxygen.
Disadvantages of Biomass Energy
1) Cost of construction of biogas plant is high, so only rich people can use it.
2) Continuous supply of biomass is required to generate biomass energy.
3) Some people don�t like to cook food on biogas produced from sewage waste.
4) Biogas plant requires space and produces dirty smell.
5) Due to improper construction many biogas plants are working inefficiently.
6) It is difficult to store biogas in cylinders.
7) Transportation of biogas through pipe over long distances is difficult.
8) Many easily grown grains like corn, wheat are being used to make ethanol. This can have bad consequences if too much of food crop is diverted for use as fuel.
9) Crops which are used to produce biomass energy are seasonal and are not available over whole year.
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The term "biomass" refers to organic matter that has stored energy through the process of photosynthesis. It exists in one form as plants and may be transferred through the food chain to animals' bodies and their wastes, all of which can be converted for everyday human use through processes such as combustion, which releases the carbon dioxide stored in the plant material. Many of the biomass fuels used today come in the form of wood products, dried vegetation, crop residues, and aquatic plants. Biomass has become one of the most commonly used renewable sources of energy in the last two decades, second only to hydropower in the generation of electricity. It is such a widely utilized source of energy, probably due to its low cost and indigenous nature, that it accounts for almost 15% of the world's total energy supply and as much as 35% in developing countries, mostly for cooking and heating.
Biomass is one of the most plentiful and well-utilised sources of renewable energy in the world. Broadly speaking, it is organic material produced by the photosynthesis of light. The chemical material (organic compounds of carbons) are stored and can then be used to generate energy. The most common biomass used for energy is wood from trees. Wood has been used by humans for producing energy for heating and cooking for a very long time.
Biomass has been converted by partial-pyrolisis to charcoal for thousands of years. Charcoal, in turn has been used for forging metals and for light industry for millenia. Both wood and charcoal formed part of the backbone of the early Industrial Revolution (much northern England, Scotland and Ireland were deforested to produce charcoal) prior to the discovery of coal for energy.
Wood is still used extensively for energy in both household situations, and in industry, particularly in the timber, paper and pulp and other forestry-related industries. Woody biomass accounts for over 10% of the primary energy consumed in Austria, and it accounts for much more of the primary energy consumed in most of the developing world, primarily for cooking and space heating.
It is used to raise steam, which, in turn, is used as a by-product to generate electricity. Considerable research and development work is currently underway to develop smaller gasifiers that would produce electricity on a small-scale. For the moment, however, biomass is used for off-grid electricity generation, but almost exclusively on a large-, industrial-scale.
Biomass, Defining green or environmentally sustainable biomass-generated electricity has proved difficult and contentious. Biomass can be so broadly defined to include unsustainably harvested forest timber, contaminated waste wood, municipal solid waste, and tires. Some definitions include landfill gas, while some do not. Environmental groups are pushing for a more narrow definition of biomass green power which excludes burning garbage and limits biomass to sources such as forest-related harvesting residue, landscaping and right-of-way trimmings, and agricultural crops and crop by-products. Additionally, biomass must be burned cleanly to be green, and this is not a given. Burning landfill gas is viewed by environmentalists as an environmentally sound practice, but many object to characterizing it as biomass energy.
Landfill Gas, Landfills produce methane gas which is a powerful greenhouse gas if vented un-burnt to the atmosphere. While burning landfill methane gas is not pollution-free, it is much better to burn it than vent it. Burning landfill gas to produce electricity also reduces fossil fuel use, another plus.
There are two issues that affect the evaluation of biomass as a viable solution to our energy problem: the effects of the farming and production of biomass and the effects of the factory conversion of biomass into usable energy or electricity. There are as many environmental and economic benefits as there are detriments to each issue, which presents a difficult challenge in evaluating the potential success of biomass as an alternative fuel. For instance, the replacement of coal by biomass could result in "a considerable reduction in net carbon dioxide emissions that contribute to the greenhouse effect." On the other hand, the use of wood and other plant material for fuel may mean deforestation. We are all aware of the problems associated with denuding forests, and widespread clear cutting can lead to groundwater contamination and irreversible erosion patterns that could literally change the structure of the world ecology.
Biomass has to be considered in the search for an alternative source of energy that is abundant in a wide-scale yet non-disruptive manner, since it is capable of being implemented at all levels of society. Although tree plantations have "considerable promise" in supplying an energy source, "actual commercial use of plantation-grown fuels for power generation is limited to a few isolated experiences." Supplying the United States ' current energy needs would require an area of one million square miles. That's roughly one-third of the area of the 48 contiguous states. There is no way that plantations could be implemented at this scale, not to mention that soil exhaustion would eventually occur. Biomass cannot replace our current dependence on coal, oil, and natural gas, but it can complement other renewables such as solar and wind energy.
According to Flavin and Lenssen of the Worldwatch Institute , "If the contribution of biomass to the world energy economy is to grow, technological innovations will be needed, so that biomass can be converted to usable energy in ways that are more efficient, less polluting, and at least as economical as today's practices." When we have enough government support and have allotted enough land for the continuous growth of energy crops for biomass-based energy, we may have a successful form of alternative energy. But "as long as worldwide prices of coal, oil and gas are relatively low, the establishment of plantations dedicated to supplying electric power or other higher forms of energy will occur only where financial subsidies or incentives exist or where other sources of energy are not available." Although it is currently utilized across the globe, biomass energy is clearly not capable of sustaining the world's energy needs on its own.
Source : http://www.altenergy.org/renewables/biomass.html
Up to one fifth of global energy could be provided by biomass from plants without damaging food production. A new report released by UKERC suggests that. This could give some answers to the major debate which has been raging about the role biomass could play within the future energy system. While some say that biomass could play a major role in providing the world with energy, others say that it could mean an environmental disaster.
To get to the heart of the controversy, UKERC scientists at Imperial College London have undertaken a systematic review of the evidence base.
The report finds that the main reason scientists disagree is that they make different assumptions about population, diet, and land use. A particularly important bone of contention is the speed with which productivity improvements in food and energy crop production can be rolled out.
According to Dr. Raphael Slade, the report�s lead author, we can get one fifth of the current global energy supply from biomass if we make the best use of agricultural residues, energy crops and waste materials. Also he adds that this is a reasonable ambition. The report finds that getting more than this is technically possible but requires assumptions about food production and changes in diets that look increasingly challenging, especially as people in Asia and Latin America begin to adopt a high meat western diet as incomes rise.
All in all, 20% of the worlds energy supply from biomass isn�t a small number. I think achieving this goal is a fantastic way to get a 100% renewable energy world.
Source : http://www.tomorrowisgreener.com/biomass-could-produce-fifth-of-global-energy-without-damaging-food-production/
As we all know concentrated solar energy is the most commonly used renewable energy for electrical power generation. Now, a Colorado company, called Sundrop Fuels, has a new approach to the production of biofuel. The company combines the mirrors and tower of concentrated solar power with the process for the production of bio-based fuels.
Where conventional biomass-producers burn biomass for the energy needed to create biofuel, Sundrop uses concentrated solar as their energy source to gasify a range of feedstocks like agricultural waste, energy crops and wood waste. The company claims it can produce a wide range of fuels including gasoline, diesel and aviation fuel.
The company uses the high temperatures from the concentrated solar array to vaporize the biomass feedstock and form it into syngas, which is a mixture of carbon monoxide and hydrogen. The syngas forms the basic ingredient of the fuel it is turned into.
This method has more efficiencies that provide additional benefits, for example, by using the solar array, the process yields 100 to 125 gallons of fuel per ton of biomass, which is more than twice what normal biomass-producers can obtain. Next to that the process also requires far less water then other biomass systems. Only a half gallon of water is needed to produce a gallon of fuel, compared to 6 to 7 gallons required in other systems.
Sundrop expects that its process can create gasoline, without any subsidies, for less than 2 dollars per gallon. Currently the company is constructing a pilot plant and aims to have a full, commercial-scale plant of 100 million gallons operational by 2015.
Source : http://www.tomorrowisgreener.com/synthetic-gasoline-from-biomass-and-solar-power/
What is Biomass Energy?
