Design And Development Of Automatic Gas Burner Control System For Gas Burners Based On The EN298:2003Safety Standard

Fuel is widely used in industrial and agricultural production, as well as in human’s life. With the development of science and technology, in order to make the development and utilization of fuel more rational, burners arise at the historic moment. Nowadays, burners have gradually been used in every field of human’s life, so that combustion process controlling has become main application field of the control theory.Compared with the developed European and American countries, the history of burner technology in China is much shorter, and the technology is relatively outdated. There is no clear quality and security standards for burners or combustion controlling equipment. The price of the imported burners and controlling equipment with exquisite workmanship, high efficient and environmental protection is on the high side.Combining with the actual needs of domestic combustion controlling system, this thesis designed a low cost, intelligent, efficient, environmental protecting and highly security gas burner controlling system based on the EN298:2003security standard specification published by the European Union.The system is a type of automatic operation of gas burner running on the STC MCU, which is added in intelligent controlling mechanism for the operation process of the equipment such as the air inletting, igniting and gas transporting. At the same time, to ensure the equipment in secure working state, that is FailSafe state, the system adopts double MCU technology in terms of hardware. In terms of software, it sets up a series of logic judgment based on security in the system for functions such as detecting, controlling, and resetting, ensuring the latching and certain self-repairing ability for the fault in actual operation.In order to make the production and utilization of the product more reliable, and to improve the ability of electromagnetic compatibility of the system, the author elaborately designed the hardware circuit taking use of the photoelectric coupler to isolate the high voltage alternating current of220V and the low voltage power supplied for the MCU. In addition, the system set self-prepared encryption program inside for protecting the intellectual property rights and manufacturer’s rights, to make sure that even if the illegal molecular copies the hardware circuit, they can not use the program in the system. During the later system testing, the author tested the basic function of the system on the test bench provided by the manufacturer. It shows that the system can work well in accordance with the predetermined procedure when controlling the processes of air inletting, igniting and gas transporting intelligently, and latching and repairing the fault diagnosis of analogue.Then the author tested the stability of the system by the DN801fast pulse group electrostatic interference instrument. The results showed that the system can work stably and continuously and meet the requirements of gas burner controlling system under the interference of pulse group. Eventually, the author completed the integral system test with the help of a manager from the manufacturer who in charge of the project, the results is that all the functions and technical indicators meet the industry standards and requirements of the manufacturer. The design has been put into mass production and brought to market.