Combustion Burner Safety Requirements

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Inspection Requirements before Ignition

  • Distributed Control System (DCS) and Nature Gas Valve Manifolds:
    Hand valve of valve manifolds inlet; water separator; front pressure gauge of pressure-relief valve; pressure-relief valve; high-tension switch; low-voltage switch; Back pressure gauge of pressure-relief valve; Gas flowmeter (temperature/pressure compensation); double automatic safety globe valve; emergency stop button of valve manifolds; natural gas/oxygen sensors and related linkage controls around valve manifolds; Oxygen/natural gas flow ratio protection; Furnace temperature interlocking protection.
  • In Front of the Burner:
    Manual globe valve (oxygen, natural gas); oxygen check valve; natural gas check valve; handheld sensor for on-site gas leak detection near burner (owned); Emergency stop button of site combustion (combustion valve manifolds includes)
  • Burner:
    Pre-assembly has been carried out according to requirements.

Operation and Maintenance

  • The disassembly of burner and its parts shall be prohibited in operation (with oxygen/and/or natural gas).
  • The burner shall not be ignited before the minimum temperature in the combustion space is lower than 800DC (unless UV system is used and safe linkage is ensured).

Precondition of Combustion after the Oxidizer/Fuel into the Burner

  • The internal temperature of the furnace is higher than the autoignition temperature of the fuel/oxidizer (within all reaching range of the fuel/oxidizer).
  • Fuel/oxidizer is supplied in proportion to combustion requirements.
  • When starting the Burner at high temperature, the cooling gas (using oxygen) should be connected first, and then the body of burner should be in place. The starting process of burner is similar to that of similar pure oxygen burners. When the power is higher than the minimum safety power, the cooling gas can be turned off.

If the temperature inside the furnace is lower than the fuel/oxidizer autoignition temperature (within all reaching range of the fuel/oxidizer)

  • Using an ignition device to aid the ignition.
  • Using UV to monitor flame, interlinking and controling with the fuel/oxidizer control system.
  • Important inspection requirements in the process of combustion.
  • Inspecting leakages of fuel/oxidizer.
  • Inspecting whether the flame is normal.
  • Inspecting whether there is any anomaly in the composition of the exhaust gas.

Burner emergency disposal/safety requirements (when running the burner in the factory)

  • When replacing or maintaining the burner, in order to prevent the risk of combustion caused by oxygen or natural gas leakage, fan blowing shall be applied on site.
  • The oxygen and natural gas supply to the burner shall be stopped immediately if combustion occurs outside the burner.
  • If oxygen or natural gas is found to be enriched around the burner (no obvious leakage), the supply of oxygen and natural gas to the burner shall be shut off immediately. Meanwhile, the fan shall be used to blow air locally to the burner. Locating the source of the leak and deal with it.
  • It is not permitted to pull out the nature gas nozzle when the nature gas is being supplied.
  • When the combustion has been stopped for over 5 minutes, the burner metal parts shall be removed and the holes on burner blocks shall be sealed.
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