Combustion of wooden waste
How to choose a heating boiler for burning wood-based waste
Waste from the furniture and wood industries can be cheap fuel and generate really cheap and ecological energy. However, certain conditions must be met regarding the type of heating installation, which should be properly adapted to the waste to be burned and the technology conditions of the plant itself. Already now, waste from boards, mdf, osb, chipboard, HDF, sawdust, edgings and other wood-based waste can be burned and heated the hall or provide free heat to the dryer or technology. Our company advises and uses advanced waste incineration technologies ensuring "waste to energy", i.e. energy from waste, which fits perfectly into the currently popular closed-loop technology of the company.
According to Regulation of the Minister of the Environment of November 7, 2014 on emission standards for certain types of installations, fuel combustion sources and waste incineration or co-incineration devices, wood-based waste, wooden boards, wood chips, sawdust, HDF, MDF and others can be burned only in specially adapted devices equipped with dedicated equipment for the combustion of exhaust gases at high temperatures.
So how to choose the right boiler for burning wood-like waste?
The selection of the heating device is completely different than that of a conventional biomass furnace. Here, the device is selected according to the type of waste, its flow on a daily or monthly basis and the technical possibility of heat collection. Our company offers central heating boilers for waste, disposal or thermal waste treatment in the power range from 150 kW to 2 MW. The offered solutions and waste incineration systems are technically verified, supported by references and appropriate emission tests.
In order to select an appropriate installation for thermal utilization of wood-based waste, we must therefore have: the daily or monthly amount of waste to be utilized and the technical capacity to collect heat. Heat removal for technology is popular in the furniture, carpentry and sawmills industries. Process heat is often used to power the wood drying kiln, which is a logical and economically justified choice.
According to the standards defining the equipment of the installation, the installation must be supplemented with the following thermal treatment of wood-based waste:
• Auxiliary burner to ensure a stable combustion gas combustion temperature, ie above 850 ° C
• Control of the fuel feeding system with the lack of temperature detection system in the afterburning chamber, ie: if we do not have afterburning at 850 ° C, the installation is to stop in an emergency, the waste is not to be fed to the furnace, we are to stop recycling.
• The flue gas cleaning system, depending on the degree of pollution of the flue gases, has many options for retrofitting, it should be remembered that the acceptance measurements of the installation will take place at the so-called chimney - i.e. at the exhaust outlet to the chimney
Exhaust gas treatment system - what is it?
In the case of using the deNOx and deSOx gas cleaning techniques, we must apply the appropriate gas cleaning technology. The deSOx technology allows for the simultaneous removal of nitrogen oxides (NOx) and sulfur dioxide (SO2) from flue gas from low and medium power combustion plants, in particular in the process of thermal waste disposal. The main elements of the deSOx technology are lances enabling the injection of reagents to reduce SO2 and NOx in the appropriate temperature range inside the boiler, in accordance with the appropriate algorithm controlling the system and position of the lances.
The main advantages of this method of cleaning flue gases from waste incineration are:
• Simple system - one dosing system for SO2 and NOx reducing agents
• Reasonably priced and low investment costs
• High reduction efficiency - directional dosing of reagents depending on the position of the temperature window
• Environmentally friendly technology - simultaneous reduction of two types of pollutants - SO2 and NOx
Legal regulations and emission standards are important
The technology meets the emission requirements in accordance with the Regulation of the Minister of the Environment of March 1, 2018 on emission standards for certain types of installations, fuel combustion sources and waste incineration or co-incineration devices for new sources:
• Sulfur dioxide emission standards from solid fuels combustion for nominal source power
• Nitrogen oxide emission standards from solid fuel combustion for the nominal source power
• The dust emission standards from solid fuels combustion for the nominal source power
The deSOx gas purification technology is based on a combination of non-catalytic NOx reduction and SO2 reduction with a baking soda solution. The aqueous ammonia solution (ammonia water) is dosed through the appropriate nozzles.
More about waste to energy - under link: waste to energy