What are the steps to install a interlock shutdown safety system on an industrial heating furnace?
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The device is equipped with a heating furnace, but it lacks a interlock shutdown system; this not only fails to meet legal and regulatory requirements but also prevents true intrinsic safety. If a such interlock system is to be added through modifications, what are the specific steps and approaches?
Does your factory have boilers? You can refer to the interlock system used in boilers for burners; the main thing to consider is the gas pressure – if it drops too low, the gas valve should be shut off； If the flue gas is toxic, it is also necessary to consider increasing purging to ensure rapid and complete removal of the contaminants ； The combustion space is a confined environment; to ensure that the gas concentration does not pose a explosion risk, it is necessary to add pre-ignition purging interlocks. Additionally, the pressure in the furnace within this confined environment must be controlled, and shutdown interlocks should also be implemented ； On some boilers, when the smoke temperature is too high, a shutdown interlock must also be installed ； Since the combustion furnace is equipped with a residual heat boiler, the boiler level must also trigger an interlocked shutdown.
The interlocks for industrial tubular heating furnaces are generally as follows: 1. High and low interlocks for fuel level. 2. Burner flame detection interlock system. 3. High-high interlock for the material outlet temperature, as well as high-high interlock for the pressure difference between the material inlet and outlet. 4. External process interlock conditions, such as low material flow rate. 5. Leak detection between valve assemblies in the gas pipeline system. 6. Furnace purging. 7. If there is a waste heat recovery system, there is also interlocking between the fans and the dampers in the flue ducts.