Tiny-oil ignition burner with bluff body

Abstract

The utility model relates to the technical field of combustors, in particular to a tiny-oil ignition combustor with a bluff body. Comprising an inlet elbow and an air duct which are connected, an ignition gun protection pipe penetrates through the inlet elbow and extends into the air duct in the axial direction, a multi-stage combustion chamber is arranged in the air duct and located in front of the ignition gun protection pipe, and a concentration ring is arranged in the air duct and located on the outer side of the end of the ignition gun protection pipe. A bluff body opposite to the last-stage combustion chamber is arranged in the center of the end of the inner cavity of the air duct and located in the last-stage combustion chamber. The bluff body is arranged at the end of the air duct, airflow distribution can be improved, a backflow area is formed on the wake of the bluff body, the combustion temperature in the combustion chamber can be reduced, the coking phenomenon is avoided, the pulverized coal combustion environment is improved, the mixing efficiency of fuel and air can be improved, the pulverized coal combustion efficiency is improved, and pollutant emission is reduced; and noise and vibration of the combustor can be reduced, and stable operation of the combustor is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to a micro-oil ignition burner with a blunt body. Background Art

[0002] Energy conservation and emission reduction is a global issue in the development of modern society. The coal-saving and oil-saving technologies of large pulverized coal boilers are very important. Due to the increasing shortage and high cost of fuel, in order to save fuel, China has successfully developed plasma oil-free ignition technology, small oil gun and little oil direct ignition of pulverized coal technology, and micro-oil gasification ignition of pulverized coal technology.

[0003] Plasma oil-free ignition technology is suitable for high-volatile bituminous coal and lignite, but its system is complex, the investment is large, the ignition parts are easily polluted and burned, and it is not suitable for anthracite and low-volatile coal. Small oil gun less oil ignition technology has been widely used in boilers, with low equipment investment, high reliability and strong practicality. Micro-oil gasification ignition of pulverized coal technology is the development of small oil gun ignition technology. The combustion temperature of gasified fuel is higher, the pyrolysis effect on pulverized coal is improved during ignition, and it is more fuel-efficient when igniting pulverized coal.

[0004] The current micro-oil ignition burners all adopt a multi-stage casing structure to form a multi-stage coal powder combustion chamber to achieve the effects of staged combustion, airflow cooling, and step-by-step ignition.

[0005] Pulverized coal combustion is mostly used in large boilers. Due to the large size of the furnace, the burner flame is longer. In addition, the heat load in the furnace of large boilers is higher, and the stable combustion ability is stronger. However, small boilers, especially industrial pulverized coal furnaces or industrial kilns, have a smaller combustion chamber, which not only has poor stable combustion ability and incomplete combustion, affecting boiler efficiency, but also has relatively high nitrogen oxide emissions. Utility Model Content

[0006] The utility model aims to solve the above problems, thereby providing a micro-oil ignition burner with a blunt body which can enhance the ignition stability.

[0007] The utility model solves the above problems and adopts the following technical solutions:

[0008] A micro-oil ignition burner with a blunt body comprises a connected inlet elbow and a wind tube, an ignition gun protection tube passes through the inlet elbow, the ignition gun protection tube extends axially into the wind tube, a multi-stage combustion chamber is arranged in the wind tube and in front of the ignition gun protection tube, a concentration ring is arranged in the wind tube and on the outside of the end of the ignition gun protection tube, and a blunt body opposite to the previous stage combustion chamber is arranged at the center of the end of the inner cavity of the wind tube and in the last stage combustion chamber.

[0009] Compared with the prior art, the utility model adopting the above technical solution has the following outstanding features:

[0010] By setting a blunt body at the end of the wind tube, the air flow distribution can be improved and a recirculation zone can be formed in the wake of the blunt body, which can not only reduce the combustion temperature in the combustion chamber, avoid coking, and improve the pulverized coal combustion environment, but also improve the mixing efficiency of fuel and air, improve the pulverized coal combustion efficiency, reduce pollutant emissions, and reduce the noise and vibration of the burner to ensure smooth operation of the burner.

[0011] As a preferred embodiment, a further technical solution of the utility model is:

[0012] Furthermore, a plurality of connecting rods are equidistantly arranged on the outer periphery of the bluff body, and mounting grooves corresponding to the number of the connecting rods are opened at the end of the wind tube, and the ends of the connecting rods are clamped in the mounting grooves and fixed by welding.

[0013] Furthermore, the blunt body and the connecting rod body located inside the wind tube are both provided with a wear-resistant ceramic layer.

[0014] Furthermore, the bluff body is in a truncated cone shape or a conical shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main cross-sectional structure of an embodiment of the utility model;

[0016] Figure 2 This is a left-side structural schematic diagram of an embodiment of the utility model;

[0017] Figure 3 This is a right side structural schematic diagram of an embodiment of the utility model;

[0018] Marked in the figure are: inlet elbow 1, air cylinder 2, ignition gun protection tube 3, multi-stage combustion chamber 4, concentration ring 5, blunt body 6, connecting rod 7. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0020] A micro-oil ignition burner with a blunt body comprises a connected inlet elbow 1 and a wind tube 2, coal powder enters along the inlet elbow 1 and the wind tube 2, an ignition gun protection tube 3 is penetrated on the inlet elbow 1, the ignition gun protection tube 3 extends axially into the wind tube 2, the ignition gun protection tube 3 is ignited, a multi-stage combustion chamber 4 is arranged in the wind tube 2 and in front of the ignition gun protection tube 3, in this embodiment, a total of three levels of combustion chambers are arranged, a concentration ring 5 is arranged in the wind tube 2 and on the outside of the end of the ignition gun protection tube 3, the concentration ring 5 is conducive to the timely ignition and rapid ignition of the coal powder airflow, and can maximize the high burnout rate of coal powder during cold ignition, and a blunt body 6 opposite to the previous stage combustion chamber is arranged at the center of the inner cavity end of the wind tube 2 and in the last stage combustion chamber.

[0021] Furthermore, a plurality of connecting rods 7 are equidistantly arranged on the outer circumference of the bluff body 6, and mounting grooves corresponding to the number of the connecting rods 7 are opened at the end of the wind tube 2. The ends of the connecting rods 7 are clamped in the mounting grooves and fixed by welding, and the connecting rods 7 and the bluff body 6 are stably connected to the wind tube 2 through the mounting grooves.

[0022] Furthermore, the bluff body 6 and the connecting rod 7 located inside the air duct are both provided with a wear-resistant ceramic layer to prevent the bluff body 6 and the connecting rod 7 from being severely worn.

[0023] Furthermore, the bluff body 7 is in a truncated cone shape or a conical shape.

[0024] By setting a blunt body at the end of the wind tube, the air flow distribution can be improved and a recirculation zone can be formed in the wake of the blunt body, which can not only reduce the combustion temperature in the combustion chamber, avoid coking, and improve the pulverized coal combustion environment, but also improve the mixing efficiency of fuel and air, improve the pulverized coal combustion efficiency, reduce pollutant emissions, and reduce the noise and vibration of the burner to ensure smooth operation of the burner.

[0025] The above description is only a preferred feasible embodiment of the present utility model, and does not limit the scope of rights of the present utility model. All equivalent changes made using the contents of the present utility model specification and its drawings are included in the scope of rights of the present utility model.

Claims

1. A micro-oil ignition burner with a blunt body, comprising an inlet elbow and a wind tube connected together, characterized in that: An ignition gun protection tube is passed through the inlet elbow, and the ignition gun protection tube extends axially into the air duct, and a multi-stage combustion chamber is arranged in the air duct and in front of the ignition gun protection tube, and a concentration ring is arranged in the air duct and on the outside of the end of the ignition gun protection tube, and a blunt body opposite to the previous combustion chamber is arranged at the center of the inner cavity end of the air duct and in the last combustion chamber, and a number of connecting rods are equidistantly arranged on the outer periphery of the blunt body, and mounting grooves corresponding to the number of connecting rods are opened at the end of the air duct, and the ends of the connecting rods are clamped in the mounting grooves and welded and fixed, and the blunt body and the connecting rod located inside the air duct are provided with wear-resistant ceramic layers.

2. The micro-oil ignition burner with a blunt body according to claim 1, characterized in that: The blunt body is truncated cone or cone shaped.

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