CCRES - BIOMASS

 

CROATIAN CENTER of RENEWABLE ENERGY SOURCES 

(CCRES)

 

 BIOMASS

 

The organic or waste materials obtained from the plants and animals, is known as biomass. Since plants and animals contain energy, the biomass also contains energy. Plants get energy from the sun by the process of photosynthesis, while the animals eat plants; hence biomass is an important source of energy.

The energy obtained from biomass is called as biomass energy. The biomass energy is type of alternative or renewable energy since the plants and trees will keep on growing and generating the wastes continuously, so this source of energy will be available for unlimited period of time.

The various types of garbage collected in our cities are also a type of biomass. Though the living plants are not considered to be the biomass, the garbage left by them in the form of fallen leaves, dead trees, broken branches of the trees, wasted and leftover crops, chips and pieces of wood etc are all considered to be biomass. The bark and saw dust left from the lumber mills and even the tires and livestock manure can be considered as biomass.

The trash from the house and offices contains some paper products that cannot be recycled back to the other paper products but they can also be used as the biomass. Recycling such wastes for producing biomass fuel would reduce pressure on our landfills. It is unbelievable that all these materials that create lots of disposal problems can be used to generate energy that too in the form of electricity.

In US, California itself produces almost 60 million bone dry tons of biomass every year, of which almost five million tons is used to produce biomass energy in the form of electricity. The biomass collected in California comprises of lumber mills wastes, wooden waste collected from urban areas, residues from the agricultural lands and forests, and other livestock.

The wastes generated by the humans and animals like cows are also types of biomass. By using this type of biomass for producing energy it becomes easier to manage and control the landfills.

Biomass used as the Source of Energy

All the types of biomass contain one or the types of plants and animals wastes. When the biomass obtained from plants it is burnt it catches fire instantly or after some time and releases a lot of heat. During burning the chemical energy stored within the biomass is converted into heat energy. The heat produced during the burning of biomass can be used for a number of applications like heating water, heating the rooms, producing steam, cooking the food, and for other domestic and industrial applications.

Some decomposing garbage, and wastes from humans and animals can also be used as biomass to produce methane gas, which can be used directly as the fuel. Methane is an important part of natural gas, which is used extensively as a cooking gas and also for running a number of vehicles like cars and trucks. The methane gas obtained by this method is also called as the landfill gas or biogas.

The Fuels Obtained from Biomass

Besides using the biomass for producing heat, it can also be used to produce fuels. The fuels produced from the biomass are called as biofuels. The biofuels can be used independently to or in combination with the other fuels like gasoline and diesel. Some of the popular biofuels made from the biomass are ethanol, biodiesel and natural gas.

Ethanol is produced by fermentation of sugar which can be found in sugarcane, grains like corn, sorghum and wheat, and other sources like potato skins, rice, sugar beets and yard clippings. The biodiesel can be produced from vegetable oil and animal fat feedstock. In this age of escalating fuel prices, biodiesel is one of the most popular types of alternative fuel for the vehicles. Biodiesel is mixed with traditional diesel in certain proportions to power the vehicles. The biodiesel is a clean fuel and does not produce any pollution. The natural gas can be obtained from the biomass like cow dung, human wastes, and livestock wastes. Methane, which is important part of the natural gas, is produced from the biomass.

Benefits of Using the Biomass Energy

Here are some of the important benefits of biomass energy:

1) Biomass energy is obtained mainly from the plants, animals, human wastes and garbage which would have otherwise created dirty environment and lots of disposal problems. When converted to biomass energy most of the wastes get burnt completely or they get converted to useful manure. Thus using biomass energy helps keeping our surroundings clean.

2) Biomass is a renewable source of energy that would last as long as there is plant, animal, and human life on the earth.

3) Biomass helps producing indigenous fuels and helps reducing dependency for fuels on other countries. 

CCRES 

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 CROATIAN CENTER of RENEWABLE ENERGY SOURCES 

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CCRES wood pellet mill

CROATIAN CENTER of RENEWABLE ENERGY SOURCES

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wood pellet mill


Contact: http://solarserdar@gmail.com

CROATIAN CENTER of RENEWABLE ENERGY SOURCES

Contact: http://solarserdar@gmail.com

CROATIAN CENTER of RENEWABLE ENERGY SOURCES



Pelletpresse 7,5KW
Contact: http://solarserdar@gmail.com

CROATIAN CENTER of RENEWABLE ENERGY SOURCES ( CCRES )

BIOMASS HEATING by CCRES

BIOMASS HEATING

Moving away from fossil fuels, we will need to find alternatives to coal, oil and gas for heating our homes and offices. One obvious solution is biomass - typically in the form of wood.

It is a renewable fuel that truly "grows on trees" and it can be produced locally and sustainably - as long as a new tree is planted for every tree that is cut down. Burning wood biomass emits CO2 through the chimney, but as growing trees absorb CO2 from the atmosphere biomass can be a nearly carbon neutral source of fuel as long as trees are replanted.

Batch log boilers and pellet boilers offer more convenient and efficient ways to heat with wood fuel than traditional stoves.

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Related Questions

Can I heat with pellets without using a hopper store?

It is possible to heat with pellets without having a large hopper store connected to a boiler. There are compact pellet boilers - sometimes referred to as pellet stoves with back boilers - which can be filled manually with bags of pellets.

This can be an advantage where there is no space for a hopper store, or where pellets can only be delivered in bags anyway (e.g. because there is no access for a pellet delivery truck).

Can you burn wood biomass without smoke?

Emissions from wood fuel contain virtually no sulphur dioxide and very low levels of nitrous oxides, so won’t cause acid rain. Burning wood cleanly gives off very low amounts of smoke particulates, and many wood-fired appliances are certified for smokeless zones (Defra publish a list of Smoke Control Zones).

It’s important to burn efficiently; use properly seasoned wood (with low moisture content) and make sure that equipment is used properly. Manually fed stoves can produce lots of pollutants if operated badly.

Logs should be burned fiercely with lots of air input until they are almost charcoal, after which the stove can be ‘damped down’. Reducing the air supply too early creates lots of smoke & tar. The key is good ‘secondary combustion’ of the high-energy volatile gases given off by burning wood. Some stoves are fitted with a ‘Lamda’ sensor, to regulate the amount of oxygen added and so optimise efficiency. Avoid burning treated, painted or glued wood, or non-wood waste, as these will give off toxic and polluting gases.

Building regulations require all fuel burners to have a dedicated vent to avoid production of carbon monoxide. The chimney needs an insulated flue to prevent fumes condensing as tar. With complete combustion, wood burns to a small amount of ash, which (unlike coal ash) is an excellent fertiliser.

How do I store wood biomass?

Delivered wood should be stored for at least one year, preferably two, to air-dry the wood to a moisture content below 25%. Bringing logs inside for the last week or so improves them to room dryness. Stoves might be specified to cope with 50% moisture content, but efficiency will suffer. Compressed wood pellet fuel has only about 8% moisture. Manufacturers specify pellets of a certain size, shape and moisture content to ensure reliable operation. Some pellets are produced for power station co-firing, and are not good enough quality for domestic appliances.

The required storage space depends on how big and how well-insulated your home is. A small cottage is likely to need 8 cubic metres (m3) of logs each year, a 3-bedroom house 12m3, and a large detached house 16m3. Pellets have a higher energy content and so take up less than half as much space. Stoves use 0.5 to 1.5kg of pellets per hour, so a 15kg bag should last a few days.

Larger systems can use chipped wood - this allows more automation than logs and is cheaper than pellets. A wood chip boiler heats several buildings at CAT; seasoned wood is delivered, chipped, and stored until it reaches 15% moisture content. For larger schemes, it’s a good idea to have a supply contract to ensure a reliable supply of wood.

How much will a wood biomass system cost?

A log stove is likely to cost between £500 and £1000, with installation costs probably the same again. Pellet Stoves cost £1,500 to £2,500 plus installation. A log boiler will be roughly £4,000. Together with a water storage tank, flue and installation the total will be about £10,000. Automated pellet boilers are more advanced, and so is the price tag: £6,000 to £8,000 for the boiler; the total perhaps £10,000 to £15,000.

Remember to factor in the ongoing purchase of fuel. Bought in bulk, log fuel should be cheaper than gas, oil or coal. A 15kg bag of pellets will cost £3 to £4, but bulk delivery should be similar to or less than fossil fuel. The Log Pile service (below) lists suppliers around the UK. Also, find out about the support structure in place for the equipment you choose, before going for the cheapest. Will it be easy to get the appliance serviced annually? Are there enough plumbers or engineers with the relevant knowledge?

Which wood biomass fired appliance should I choose?

Before switching to any new heating system it is vital to maximise energy efficiency. Measures such as increasing insulation, lagging pipes and draught-proofing will save money on fuel, and also on equipment - as they’ll allow you to specify a smaller boiler. A combination of wood fuel and solar water heating (for hot water in summer), can give renewably-generated heat all year round.

Open fires are a poor choice, financially and environmentally. Most of the heat goes up the chimney and the rate at which the fire draws in oxygen creates draughts across the room that reduce the benefit from the fire. A simple wood stove is a great improvement; it should need only one-third as much fuel, as the efficiency can reach 70%. Automated pellet stoves are more convenient, and can even have an automatic de-ashing function.

Advanced wood heating systems for larger houses have been common for many years in mainland Europe and the USA, and are as efficient as modern gas boilers - converting well over 80% of the fuel into useful heat.

A ‘batch’ log boiler can be fired up once a day (or less often) and the heat stored in a large water cylinder. Automated pellet boilers make wood fuel almost as convenient as gas. They are more costly, but ease of use is a big plus. For those keen on range cooking there are specially designed wood-fired ranges, with a bigger firebox to accommodate logs. Doing everything from one appliance is not ideal, so the efficiency of these is less than dedicated boilers or stoves, but they would give the satisfaction of a wood-fired sunday roast!

Why burn wood biomass?

Biomass fuels include wood, energy crops such as oilseed rape or miscanthus (‘elephant grass’), animal wastes and other agricultural by-products such as straw and grain husks. When burned, these fuels release only the amount of carbon dioxide (CO2) that they absorbed whilst growing - unlike the carbon in coal, oil and gas, which was absorbed over millions of years but is being released in the space of a few decades. The energy used to harvest, process and transport the fuel does need to be factored in as well. Very little energy is needed to harvest wood, so when used locally it is a very low-carbon option.

Planting trees to absorb carbon dioxide may provide temporary mitigation from climate change, but doesn’t address the fundamental problem. To meet our energy needs in a zero-carbon future we must make sustainable use of trees as fuel, and replant them as we harvest them – creating a continuous carbon cycle. Growing our own fuel also creates jobs and is ideal for strong, local economies.

Free, independent and impartial advice on renewable energy and sustainable living provided by the CROATIAN CENTER of RENEWABLE ENERGY SOURCES (CCRES)
Željko Serdar
Head of association