SynGas CHP Module

SynGas CHP Module

The CHP module is characterised by its particularly high electrical energy recovery from the dried sewage sludge. The synthesis gas produced in the fluidised bed reactor is converted into electricity and heat after a purification stage in a highly efficient combined heat and power plant (CHP). The electrical energy is used to cover the plant’s own needs or to feed into the grid, the heat for sludge drying.

Since a large part of the energy contained in the synthesis gas is converted into electricity in the CHP module, less thermal energy is available for drying the sewage sludge.
This energy deficit can be covered by using the available energy from digester gas. The waste heat from the drying process is in turn available for heating the digestion towers.
Thus, the entire system remains thermally self-sufficient and the use of further energy sources is avoided.

If heat has to be extracted for heating the digesters, the digesters can henceforth be heated using the recoverable low-temperature waste heat from the sewage sludge drying process. This means that the entire system remains thermally self-sufficient without the need for an additional energy source.

Advantages of the SynGas CHP module:

  • Utilisation of the high efficiencies of CHP units
  • Patented technology
  • Compact flue gas cleaning due to small air mass flow during gas generation
  • Technological contribution to an energy self-sufficient wastewater treatment plant
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1) Klärschlamm mit einem Anteil an Trockensubstanz von 85 – 95 %

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2) Kalkstein zum Beimischen als erste Entschwefelungsstufe

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3) unterstochiometrisches Verbrennen des Kohlenstoffs bei 870 °C zur Erzeugung von Synthesegas. Zerstörung aller organischen Giftstoffe

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4) Ausschleusen und Abkühlen des phosphorreichen und nahezu kohlenstofffreien Aschegranulats

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5) Grobentstaubung des Synthesegases in einem Zyklonabscheider

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6) Wärmerückgewinnung aus Synthesegas zur Bereitstellung im Wirbelschichtreaktor

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7) Feinentstaubung des Synthesegases

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8) Synthesegaswäsche: weitere Abkühlung des Synthesegases und Abscheidung von Staubresten, Teer und Schadgasen

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9) Aktivkohlefilter zur Entfernung von Schwermetallen und restlichen Schadstoffen

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10) Verwertung des gereinigten Synthesegases in einem Blockheizkraftwerk zur Erzeugung von Strom und Prozesswärme

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11) Wärmerückgewinnung aus dem Abgas des BHKWs

Process description: CHP module

Thermal treatment
1) Sewage sludge with a dry matter content of 85 – 95%.
2) Limestone for admixture as first desulphurisation stage
3) Sub-stoichiometric combustion of the carbon at 870 °C to produce synthesis gas. Destruction of all organic toxins
4) discharge and cooling of the phosphorus-rich and almost carbon-free ash granulate.

Synthesis gas purification and cooling
5) Coarse dedusting of synthesis gas in the cyclone to increase the phosphorus yield.
6) Heat recovery from synthesis gas to be provided in the fluidised bed reactor
7) Fine dedusting of the synthesis gas
8) Synthesis gas scrubbing: further cooling of the synthesis gas and separation of dust residues, tar and pollutants dust residues, tar and pollutant gases
9) Activated carbon filter to remove heavy metals and remaining pollutants

Energy generation
10) Utilisation of the purified synthesis gas in a combined heat and power plant for the generation of electricity and process heat
11) Heat recovery from the exhaust gas of the CHP unit