The existing burner consists of a tube and a gas nozzle, and the tube consists of a contraction section, a neck section and a diffusion section.Gas nozzle effect mainly gas and high pressure jet ejector low-pressure air flow, and carries on the energy exchange in the tube, for material mixing, thus achieve the goal of mixed gas in the tube outlet full combustion, but by ejecting transonic nozzle ejector air produces high frequency noise at the same time, for environmental protection function, control noise within the acceptable range is critical.At present, only one kind of air can be ejected from the gas nozzle. In some working conditions, two kinds of gases need to be ejected for mixed combustion.In order to effectively control the noise generated by the existing nozzle and achieve the demand of simultaneously ejecting two gases, it is necessary to reconstruct the contraction part of the pipe.
Burner has the noise reduction function, including nozzle and venturi tube, tube includes a body connection first contraction, neck and expansion, between tube and described the nozzle with board structure, board structure including board and at least one plate, plate connection between the nozzle and on the bottom of the contract in the first part, within each plate since the shell wall extends and forming a second contraction, the plate to plate space form multiple port, each class respectively with an air intake entrance.The second contraction part has an inlet of the second contraction part and an outlet of the second contraction part, and the outlet of the nozzle is located at the inlet of the second contraction part formed by the bottom inner plate.The outer plate includes the side plate extending along the axis direction of the burner and the top plate and bottom plate connected at both ends of the side plate. The top plate is connected to the bottom of the first contraction part, the bottom plate is connected to the nozzle, and the air inlet is set on the side plate.The number of the inner plate is set as one. The inner plate divides the outer plate and forms two flow channels, including the first-class channel and the second flow channel. The first-class channel is formed between the inner plate and the top plate and the first contraction part, and the second flow channel is formed between the inner plate and the bottom plate and the nozzle.The first-class channel has a first intake inlet, which is arranged in the area where the side plate is located in the first-class channel, and the second flow channel has a second intake inlet, which is arranged in the area where the side plate is located in the second flow channel.The first inlet and the second inlet are hole structures arranged on the side plates.
To sum up, the burner with noise reduction function adds at least one contraction part by improving the structure of the burner and connecting a plate structure between the bottom of the tube and the nozzle.The diameter of the second contraction part is set to be smaller than that of the first contraction part, so as to ensure that the gas jet of the nozzle can form vacuum and effect after the contraction part, and at the same time eject air from the first inlet and the second inlet.Moreover, the second contraction part can act as a guide plate, so that the ejector gas is rectified and stratified, reducing the velocity gradient at the outlet of the airflow and reducing the airflow noise from the sound source to a large extent.In addition, the burner structure can eject two kinds of gases at the same time to meet the requirements of multiple working conditions and expand the use range of the burner.
