The ignition wire is inserted into an oxygen filled bomb by a calorimeter to detect the calorific value of coal. The ignition device is installed, the ignition wire is placed, and then sealed and ignited. The calorimeter will automatically read the calorific value. The oxygen bomb ignition wire of the calorimeter is used for auxiliary ignition, and the material is nickel wire. If the lighter cannot be ignited, it is an electric heating wire, not a lead wire.