Type of CHP system: Grate fired boiler

Plant owner: City of Amsterdam

Commissioned: 1993

Status of plant: Commercial

Contractor details:

Main contractor: – Manufacturer plant: – Boiler: NEM B.V. Turbine, generator and condenser: Blohm + Voss AG. Hopper, grate, air system, ash transport: W+E Umwelttechnik AG. Spray absorber, E-Filter: Lurgi.  SNCR Denox: Noell, Abfall-und Energietechnik GmbH. Washer (wet) and EDV, Waste water treatment: Lab SA

Power generation: Steam turbine

The incinerator plant produces very little heat because there is only a small heat demand.

Main fuel: MSW

Fuel consist of MSW mixed with domestic and industrial waste. In average, 50% of the feedstock is organic material

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 269 MW

Total thermal input, incl. fossil fuels: 269 MW

Gross electrical output: 70 MWe

Net electrical output: 63 MWe

Heat output: 40 MJ/s

Electrical efficiency, gross: 26 %

Electrical efficiency, net: 23,4 %

Overall efficiency, gross: 30 %

Power to heat ratio: 0,66

Nominal 4 boilers 77,5 t/h steam, 2 turbines 39 MWe

How is plant controlled: Constant steam flow

Heat backup: No heat back up system

Heat usage: Heating only

Energy usage:

1. Space heating and tap water office building

2. Now 15 MWt, scheduled 40 MWt, planning 95 MWt

3. About 20 electricity customers, 30 heat customers

4. Water delivered at 120 oC, 4 bar

District heat coverage (% of total demand in DH network): 100 %

DH inlet temperature: 100-120 °C

DH return temperature: 60-75°C

Heat storage size: 3*1200 m3 m3

Hours of full load that the heat storage can meet: 18 hours

Fuel storage: 21.320 m3 x 70% (nominal) x sg 0,5 ton/m3 = 7462 ton/ (4x 25 t/h) = 74,6 hour

Waste water: Waste water is cleaned and re-used

No process water is discharged

Ash discharge:

The discharge of ash gives us the following products which can be recycled: Fine slag, Iron and non-ferrous metal fractions. The fine slag is re-used as foundation and/or filling material in road-making. The iron and non-ferrous metals are sold to the scrap metal sector. The fly ash from the dust filter, can be used as an asphalt filler

Plant description:

AEB Amsterdam is a refuse incineration plant. The four incineration lines, including combustion air facilities, grate, steam boiler, flue gas cleaning and connected flue gas duct, were erected according to a modular system. Two process lines join to form one so-called block; this means that under normal circumstances, the auxiliary installations of the flue gas cleaning unit were installed per block. Adequate cross-connections, together with appropriate dimension considerations, make it possible to ensure that in the event of the auxiliary installations failing, the whole plant would still continue to function, albeit at reduced capacity. Whenever function and safety demanded it, auxiliary installations necessary to the primary process, were erected jointly, with one unit serving as stand-by. All refuse is delivered either by road or by rail. The waste material transported in ACTS-containers by rail, is transferred to container trucks at the AEB Amsterdam complex. The refuse is then dumped in the bunker.

The plant is optimised for electricity production. It is expected that the heat production will increase when a new building area is ready.

Fuel feeding system:

The feeding hoppers at each of the incineration lines, are situated at hopper level and are fed by the refuse crane. The purpose of the feeding hoppers is to ensure an even spread of the material, delivered by the cranes at irregular intervals. The capacity of a hopper is sufficient to provide the grate with enough fuel for approximately one hour at maximum power.

Boiler: Boiler efficiency is 85%

Turbine: 2 steam turbines (condensation) with four extraction points (at 12, 4, 1,5 and 0,3 bar).

Steam data:

Steam pressure 43 bar,

Steam temperature 415 oC,

Steam production 330 t/hr

430°C, 42 bar, 33°C, 0,05 bar

Flue gas cleaning:

The semi-dry flue gas cleaning system consists of a 1-field electrostatic precipitator (pre-separator), a spray absorber and a post-connected 3 field electrostatic precipitator. The wet flue gas cleaning system consist of a wet scrubber, with washing towers, venturiscrubber and aerosol separator.

Cooling system:

Tube condensor cooling with surface water

Steam condition after turbine 33°C, 0,05 bar

Staff:

180 in total

10 operators + 40 maintenance during daytime

10 operators during nighttime

Electricity sale info:

The sales of electricity are divided into 2 major periods, 1. Peak: working days from 07.00 until 23.00 hours, 2. Off-peak rest of the year. Prices during peak are normally three times higher then off-peak, as seen in a long time period. Prices vary during the year as a result of temperature differences, trading results, stock marker e.g. Some times a volume is traded as base load against a fixed price per MWh. Normally both methods are used. But, the smaller the period between trading and deliverance prices can vary more.

Total capital cost: € 196,000,000

DFL 430,000,000 in 1993

Data collected and quality assured by: Biomass Technology Group BV.

Contact person: Harrie Knoef