WtE Process Flow Chart
WtE Technological Process
SUS Environment has introduced advanced semi-dry flue gas treatment technology and equipment from abroad. Based on it, we have successfully developed dry scrubber, semi-dry scrubber + dry scrubber and SNCR denitration process.
SUS Environment also possesses the patent of dry + wet flue gas purification, which can be configured with suitable process according to the emission requirements of flue gas.
SUS Environment has developed a heavy metal stabilization treatment process and successfully applied it to stabilize fly ash from WtE plants in China. The core equipment of the system, biaxial shear fly ash mixer, has filled the gap in this technical field in China. Fulaixi, a heavy metal chelating agent for fly ash developed by the company, is to be added around 0.1%-3% of the total amount of fly ash. The fly ash after treatment meets the standard GB16889-2008.
By the adoption of SNCR denitration technology of SUS Environment, NOx emission concentration can be reduced to lower than 200mg/Nm3, satisfying the emission standard of EU 2010. SUS Environment has successfully applied SCR technology to Ningbo Project, NOx emission concentration is controlled by lower than 75mg/Nm3.
SUS Environment has introduced advanced technology to dry and incinerate the sludge. Our patented mixed sludge incineration technology provides a complete set of solutions for sludge treatment in WtE plants.
Under the unified command of the waste crane control room, the garbage truck discharges the waste into the waste bunker through the designated discharging door. With the negative pressure design, the waste bunker has the capacity of the waste quantity for 6-7 days.
Heat generated from waste incineration is recovered by a heat recovery boiler to generate steam, through which two condensing steam turbine generators are used to generate power. Except for the purpose of plant operation, the rest of the electricity is transmitted to the power grid.
The flue gas purification system adopts SNCR (selective non-catalytic reduction) + semi-dry scrubber + dry scrubber + activated carbon injection + bag filter + SGH (steam-gas heater) + SCR (selective catalytic reduction) + wet scrubber + GGH (gas-gas heater) combined treatment process. The flue gas is discharged into the atmosphere after denitration, deacidification, and removal of dust, dioxin, heavy metals and other harmful substances by the flue gas purification system. The flue gas emission standard is stricter than Directive 2010/75/EU and the Standard for Pollution Control on the Municipal Solid Waste Incineration (GB18485-2014).
The overall process control adopts distributed control system (DCS), with a high level of automation. The slag generated from waste incineration can be recycled after deironing. The fly ash collected by the flue gas purification system is transported to the designated area for landfill after stabilization. The waste leachate is recycled after being treated by the leachate treatment station in the plant, therefore, Near Zero Emission is achieved.
WTE EPC SERVICES
After the introduction of the world-leading Swiss VonRoll&Hitz mechanical grate incineration technology, SUS Environment has localized the technology with continuous improvement and innovation.