New Plant - EEW Energy from Waste Delfzijl B.V. (NL)

In the industrial park Osterhorn Delfzijl in the Dutch province of Groningen, EEW Energy from Waste operates a waste incineration plant for industrial and household waste as well as for refuse derived fuels.


The advantage of the location is a very high demand for electrical and heat energy in the neighboring chemical park.
The waste incineration plant Delfzijl (Figure 1) consists of three identical incineration lines in which a maximum of 576,000 tons of waste per year are thermally utilized.

Figure 1: Waste incineration plant Delfzijl

The steam generated is used to supply neighboring industrial companies.
In the run-up to this new site, ete.a GmbH had carried out an extensive concept investigation and evaluation for the flue gas treatment on behalf of the present EEW. EEW had decided in favor of the following flue gas treatment concept designed by ete.a.
The flue gas treatment is based on a two-stage process (Figure 2) to achieve lowest emission values. The first stage consists of a pure dry sorption by injecting sodium bicarbonate (NaHCO3) at a boiler outlet temperature of approx. 230 °C for the main separation of the acidic pollutant gas components. The fly ash and the reaction salts are separated on a fabric filter. Subsequently, the nitrogen oxides (NOx) are separated in an SCR unit at approx. 230 °C. The nitrogen oxides are reduced by a diluted ammonia solution (25% ammonia water (NH4OH)) is injected upstream of the catalyst as a reducing agent.

Figure 2: Structure of the flue gas treatment system in Delfzijl

The second stage consists of another dry sorption stage with fabric filter, but based on hydrated lime (Ca(OH)2) with dosing of lignite coke (in German HOK – Herdofenkoks). The task of this second stage is essentially to reduce the heavy metals, in particular mercury, dioxins and furans, by adsorption on activated coke. Furthermore, the residual separation of the acidic pollutant gas components takes place here.
To ensure that this separation is effective, the exhaust gas is cooled to a temperature of approx. 130 °C by means of an ECO. In addition to the favorable separation conditions, this offers a considerable improvement in the energy efficiency of the overall plant. The thermal energy recovered in this process amounts to 4,500 kW.

The exhaust gas cleaning system guarantees lowest emission values (Table 1) and maximum heat utilization.

Table 1: Pollutant gas concentrations / emission values (year 2014) [3]

The concept of flue gas treatment enables a boiler efficiency of 93% and thus contributes significantly to the economic efficiency of the plant.

[1] Bieber Horst (EEW Energy) from Waste Delfzijl B.V. (NL), Karpf Rudi (ete.a Ingenieurgesellschaft mbH). Energy-efficient exhaust gas cleaning behind waste incineration plants.
[3] Karpf Rudi. Supplementary opinion to the opinion on the assessment of the exhaust gas purification process of the waste incineration plant Delfzijl (NL). 2016