BP Process Safety Series - Safe Furnace and Boiler Firing, by Collective

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Extra resources for BP Process Safety Series - Safe Furnace and Boiler Firing, Edition: 5th ed.

Example text

Such a condition may require that the process unit be shut down in order to drain the fuel-gas system. If the process unit has an air preheater, there is a good possibility that the equipment can be set on fire from poor combustion of the fuel-gas-line liquid. Precautions must be taken to avoid such fires in air preheaters, due to the destruction which occurs. Water vapour in fuel-gas systems will condense during cold weather. The water may freeze and plug the line at low spots or risers. If a fuel-gas system contains water and condensed hydrocarbons, a snow-like hydrate is formed.

4. Be sure that fuel valves and cocks at the burners are tightly closed (see Figure 39). An open or leaking valve can result in an explosive firebox mixture. Figure 39 Sketch of pilot gas and fuel gas lines. In one accident, two boiler burners were lit and later one was shut off without adjusting the draught. This caused the other burner to go out. The gas was immediately shut off at the main line, but not at the burner: The firebox was then purged, and the main gas valve was reopened. Gas flow through the open burner valve accumulated in the firebox.

A separate burner in the firebox used only for the waste gases and not for process-heat requirements. A separate pilot and pilot gas system for the waste-gas burner. Figure 28 Safe venting of waste gases or vapours to furnaces requires extra equipment. Where waste gases are being burnt it is important that the environmental impact is assessed and that appropriate abatement equipment is installed where necessary. 34 SAFE FURNACE AND BOILER FIRING 5 Burners Many different burner designs are available for use with oil, gas or both.

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