WTEC can provide the complete technology for a combined heat and power plant: from the fuel bunker to the chimney, including power generation and heat supply – precisely tailored to your needs.
WTEC designs and produces water and air-cooled grates for biomass and waste. The water-cooled moving grate is ideally suited for particularly high-calorific fuels. In addition to grate firing, blow-in furnaces for dust, granulate or fibers are also part of our product range.
WTEC firing systems are characterised above all by their wide range of applications and their insensitivity to fuel and load fluctuations. The modular design achieves a maximum degree of adaptation of the furnace to the fuel requirements and the robust design also enables particularly long travel times with low wear.
Flue Gas Cleaning
WTEC can apply its technologies, extensive technical know-how, and managerial capacities to reach the goal of solving client’s environmental problems while obtaining maximum productive results with minimal operating and capital costs.
Flue Gas Cleaning
Air pollution control technologies such as Desulphurization (FGD/DeSOx),
Denitrification (DeNOx) and particulate
reduction systems as well as any other
required technologies can be provided
to control the gaseous emissions for
industrial and municipal sources,
to purify and safeguard our environment.
Steam boilers can be used very flexibly. Steam can be used to heat various processes and the steam can be converted into electrical energy in turbines. Almost all possible scenarios can be combined.
We combine the boiler systems with our various flexible firing systems and thus offer our customers an optimum system from a single source.
We supply different boiler types for every application:
• Classic vertical water tube boilers, for small/mid size plants
• Horizontal water tube boilers, also called tailend boilers, for mid/big size plants
Rotary incinerator is suitably studied for burning industrial and hazardous waste as well as municipal wastes.
It consists of a rotary kiln inside lined with refractory materials slightly inclined to the horizontal.
The revolving action of the kiln, provides a mixing action of the waste material which results into a more efficient burning and the variable rotation, regulated by frequency converter, and slope give enough residence time to assure optimal combustion efficiency
A burner located on the front face of the kiln ensures that the temperature in the kiln does not fall below the requested combustion temperature (up to 1000 °C).
The burner is also used to pre-heat the temperature of the kiln before any waste is fed to the kiln.
At the discharge end the cylinder is provided of an air cooled section.
The air blower has a capacity for 150% excess air for this reason high combustion efficiency can be assured over a wide range of operating conditions.
Heat in the flue gases coming from the Post Combustion Chamber can be recovered inside a steam boiler to decrease gas temperature before successive treatment.
Heat can be also recovered by preheating combustion air inside a heat exchanger
Flue Gast Conditioning…
Whereas to heat recovery from flue gases is not requested they can be thermally conditioned with water by atomization lances in a tower internally lined in order to bring gas temperature complying with successive dry flue gas treatment inside baghouse.
… and Dry Absorption Depuration
Flue gases acid pollutants (HCl, HF, SO2) are transferred into a solid.
Calcium Hydrate or Sodium Bicarbonate are used as sorbent
The flue gas with particulate, reaction products and unreacted reagents enters the filtration section, where a Baghouse removes almost all the particulate matter, and allows to complete the deacidification reactions on the cake layer formed on the bags.
Depending on the characteristics of waste activated carbon can be also injected before reaction tower for the removal of heavy metals, dioxins and furans.
Exhaust activated carbon is discharged from baghouse together with by-products.
Wet Absorption Depuration
Flue gases are cooled down and adiabatically saturated by means of a Water Quencher.
Gases enter then the adjustable Venturi. Here the gas is saturated. The droplets trap the particles that will be discharged with the blow down.
Gases flows counter-current in the absorbing tower.
In the lower part, where there is the liquor tank, an acidic solution (pH 3÷4 approx.) is circulated to recover mainly HCl, HF and Heavy Metals.
In the upper part a basic solution (pH 7,5 approx.) is circulated to mainly remove SO2.
Caustic Soda is fed in required quantity to keep the pH in relation to the acidic gases. Salts and heavy metals are discharged with the blow down.
As last step, the saturated gases flow through a Mist Eliminator to retain droplet.
ID Fand and Stack
Whatever it is the selected flue gas treatment an induced draft fan, with speed controlled by an inverter, is used to control the draft through the entire complex by maintaining a lightly negative pressure in the rotary kiln lightly negative pressure in the rotary kiln and to discharge the gases into the atmosphere through a stack.