Dual fuel ignition device and work method thereof as well as safety type dual fuel control system based thereon and control method thereof

A dual fuel ignition device, comprising:

• a high-heating value gas igniting end, comprising a first thermocouple having a first cathode and a first anode and an ignition burner adapted to high-heating value gas, wherein the ignition burner is connected with a branch of a gas inducing gas flow;
• a low-heating value gas igniting end, comprising a second thermocouple having a second cathode and a second anode and an ignition burner adapted to low-heating value gas, wherein the ignition burner is connected with another branch of the gas inducing gas flow, wherein the first cathode is directly connected to the second cathode or the first anode is directly connected to the second anode to output electric potential according to heating condition of the thermocouples;
• fire of the ignition burner heats up the corresponding thermocouple only to generate the electric potential when the igniting end correctly induces the gas due to position configuration of the two thermocouples, and when the igniting end induces the high-heating value gas into the low-heating value igniting end by mistake, the fire heats up the two thermocouples at the same time to offset or reduce the output electric potential.