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Gasification technology : Product gas utilisation

Product gas combustion in an engine

The mechanical output of an engine can be calculated by the following formula:

 
NES
  
1
  
SV x 10-3
------
x VE x
----
  
   
2
  
60
  
MA =
-----------------------------
 x CV x D x TE
 
1 + R
  
  • Where:SV = Swept volume of the engine in l
  • NES = Nominal engine speed in rpm
  • VE = Volumetric efficiency
  • CV = Heating value of the product gas in MJ/kg
  • D = Specific density of the product gas in kg/Nm3
  • TE = Total efficiency
  • R = Stoichiometric ratio Nm3 air / Nm3 product gas
  • MA = Mechanical output of the engine in kW
  • TAE = Total amount of energy aspirated in kW
  • TFPG = Total flow of producer gas aspirated in the mixture in Nm3/s
  • TFM = Total flow of mixture aspirated in Nm3/s
  • HVSM = Heating value of the stoichiometric mixture product gas / air in MJ/Nm3
You can introduce your own data in the following table:
definition symbol
value
 suggested value unit
Heating value product gas CV bbbbb MJ/kg
Specific density of product gas D kg/Nm3
Stoichiometric ratio air/gas R b1.2  
Swept volume engine SV   I
Volumetric efficiency VE 0.8  
Nominal engine speed NES   rpm
Total engine efficiency TE 0.3  
     
Heating value stoichiometric mixture HVSM   MJ/Nm3
Total flow of mixture aspirated TFM   Nm3/s
Total flow of producer gas aspirated TFPG    
Total amount energy aspirated TAE   kW
Mechanical output MA   kW

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