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Report Catalogue Data

  Report Class   General Public Report
  Analysis Type   Situation Analysis
  Issue Category   Technology Analysis
  Release Date   08_04_2008
  Last Update  
  Reference Code   GPR-SA.TA.CT-20080804-SFB

Combustion Technologies
Syngas (Wood-gas) Fuel Burner


The combustion of fuel for power generation or even home heating presents different problems depending on the objective and the type of fuel: vegetable oil, biofuels, and of consideration here, syngas also known as wood-gas or town-gas. The analysis of the fuel burner for syngas is particularly necessarily because of the ease with which it is produced but also because of the prospective applicability of the combustion burner of the  combustibles produced biogas during the fermentative utilization of domestic edible waste, which has every component of syngas but carbon monoxide.

Moreover, the combustion of syngas, often used for the chemicals, for supporting distributed power generation systems such as by utility corporations is just as efficacious for alleviating the potential impacts of global warming, provided the wood for generating the syngas is from young trees.

Effectively, the primary equipment for the wood-gas biofuel Burner consists of three integrated components in consistence with the general base technology for combustion:

  • Fuel Combustion Burner
  • Combustion Chamber
  • Fuel Burner Supply System

which are interfaced with secondary accessorial equipment, an Fuel Delivery System, consisting of Fuel Tank, a gas-compression pump that pumps the syngas into the fuel combustion burner. The pump should also be fitted with real-time control to activate pumping only upon actuation.

The Fuel Combustion Burner necessarily is a use-specific customized variant of the base technology fuel combustion burner. The salient customizations is that the fuel handling should address gas instead of liquid. For this reason the otherwise liquid atomizer inlet tube is now fitted with a nozzle that allows fluid to only flow only in the direction to the atomizer, only when the gas-compressor is pumping gas towards the burner, and only when the pressure reaches a particular value. Under this state the atomizer simply becomes a gas-jet pin-hole discharge device.

Further, distance "h" from discharge pin-hole of the atomizer to the end of the burner cylinder chassis is now determined on the basis of flame propagation calculations. The Fuel-Air Mixing Zone, FAMZ, is therefore of a length necessary to support intense


fuel-air mixing as to support flammability conditions, such that upon ignition, the flames gets propagated to just the outside of the cylinder chassis - the situation in which the flames is now in the combustion chamber and still continues to burn. The fuel inlet to the atomizer is a tube which can be connected to  the Fuel Burner Supply System for delivery of fuel.

On the basis of the stated requirement of ensuring flame sustained burning outside of the burner chassis, fuel igniter, flow-sensor, and temperature sensor, embedded within the FAMZ is the maximum range of propagation without extinction from the point of ignition to the chassis outlet-tip. Obviously, the higher the velocity of the gas flow through the chassis the longer the length of the FAMZ, also dependent on air-mixture ratios. Effectively, then the size of the discharge opening of the fuel atomizer-tip is of critical design and likely directly impacts the efficiency of a design of Fuel Combustion Burner.

The Combustion Chamber for a syngas burner is also very different in this case: The chamber is effectively part of a gas turbine, that is fitted with modules of the Combustion Burner circularly arranged inlet ports through which syngas is fed into combustion section of the turbine. The outlet stream of hot gases can be fed into a compressive flow device to enhance the velocity of discharge for instance.

The delivery of fuel and air to the Fuel Combustion Burner is accomplished with Fuel Burner Supply System. As per design of the base technology specification, the delivery system consists of two tubes and present for use two fluid outlets, one that is providing syngas and the other that provides air supply. The two outlets: fuel outlet port, and air-outlet port readily interface with the fuel and air inlet ports of the Combustion Burner. Effectively the Fuel Burner Supply System connects the Fuel Combustion Burner to the fuel reservoir(s), and delivers fuel in pulses or continuously as the application design specification may stipulate.

The igniter, flow sensor and temperature sensor electronics may be preferentially centralized on a single electric circuit mother-board. This choice entails the development of embedded system software and associated enclosure packaging.

 

 


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