Primary air nozzle of pulverized coal burner

Abstract

The primary air nozzle of the pulverized coal burner comprises a first fan, a connecting joint is fixedly arranged on one side of the surface of the first fan, an air outlet is fixedly formed in the side, away from the first fan, of the surface of the connecting joint, and a preheating mechanism for preheating airflow is arranged between the air outlet and the connecting joint. And the preheating mechanism comprises flow dividing pipes, heat exchange pipes, a smoke inlet pipe, a smoke outlet pipe and a second draught fan, the multiple flow dividing pipes are evenly and fixedly arranged on the surface of the outer side of the connecting joint, the heat exchange pipes are fixedly arranged on the outer sides of the flow dividing pipes, and the smoke inlet pipe is fixedly arranged on one side of the lower end of each heat exchange pipe. The primary air preheating device is good in using effect and capable of rapidly preheating airflow blown in from the primary air port so that primary air can be preheated and has a certain temperature, pulverized coal can rapidly reach the ignition temperature after entering a hearth, heat needed by ignition is reduced, and therefore rapid combustion of the pulverized coal can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pulverized coal burners, in particular to a primary air nozzle of a pulverized coal burner. Background Art

[0002] A pulverized coal burner is a device that allows pulverized coal to burn fully and quickly, generating high-temperature vortexes. Through a specially designed multi-stage, multi-nozzle air supply and guidance structure, the burner generates high-temperature vortexes within a short period of time, achieving efficient combustion. Pulverized coal burners can be divided into various types based on their intended use, including those for rotary kilns, boilers, and asphalt mixing plants.

[0003] The primary air from the primary air inlet carries the pulverized coal into the burner, ensuring that the pulverized coal can enter the furnace smoothly.

[0004] Providing initial oxygen: In the initial stages of pulverized coal combustion, primary air provides the oxygen required for the combustion of volatiles, contributing to stable ignition of the pulverized coal. However, in existing technologies, the air volume delivered to the burner through the primary air inlet is cold, resulting in poor combustion-supporting effects and a tendency to affect the temperature of the flame emitted from the radiator. Therefore, an improved primary air inlet for pulverized coal burners is needed to address this issue. Utility Model Content

[0005] The purpose of the utility model is to provide a primary air nozzle of a pulverized coal burner to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a primary air nozzle of a pulverized coal burner, comprising a first fan, a connecting joint fixedly provided on one side of the surface of the first fan, an air outlet fixedly provided on the side of the surface of the connecting joint away from the first fan, a preheating mechanism for preheating the air flow is provided between the air outlet and the connecting joint, the preheating mechanism comprising a diverter pipe, a heat exchange pipe, a smoke inlet pipe, a smoke outlet pipe, and a second fan, a plurality of diverter pipes evenly fixedly provided on the outer surface of the connecting joint, a heat exchange pipe fixedly provided on the outer side of the diverter pipe, a smoke inlet pipe fixedly provided on one side of the lower end of the heat exchange pipe, a smoke outlet pipe fixedly provided on one side of the upper end of the heat exchange pipe, and a second fan fixedly provided on the upper end of the smoke outlet pipe.

[0007] Preferably, the first and second fans are both provided with impellers through a movable shaft, and the high-speed rotation of the impellers can achieve the effect of supplying or sucking air. When supplying air, the first fan can send the airflow into the diversion pipe and the air outlet, and when sucking air, it can suck the flue gas generated by the pulverized coal burner into the heat exchange tube, and then the hot flue gas can contact the diversion pipe when flowing inside the heat exchange tube, so that the normal temperature airflow inside the diversion pipe can exchange heat with the hot flue gas inside the heat exchange tube, so that the primary air is preheated and has a certain temperature, which helps the pulverized coal to quickly reach the ignition temperature after entering the furnace and reduce the heat required for ignition.

[0008] Preferably, the outer surface of the heat exchange tube is provided with a thermal insulation layer, which can prevent the heat of the flue gas inside the heat exchange tube from dissipating outward, thereby saving energy.

[0009] Preferably, an electric motor is fixedly provided on the outside of the first fan and the second fan, and the output shaft end of the electric motor is transmission-connected to the impeller via a coupling, so that the impeller can be conveniently driven to rotate by the electric motor.

[0010] Preferably, a feed port is fixedly provided at the upper end of the air outlet, through which pulverized coal can be conveniently added to the air outlet, so that the hot air can drive the pulverized coal into the pulverized coal burner for combustion.

[0011] Preferably, the diverter pipe is made of a heat-conducting metal material. The diverter pipe of the device can be made of copper or other metal materials as needed to achieve better heat conduction and heat exchange effects.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The first fan of the utility model can send air into the diversion pipe and the air outlet, and during suction, the second fan and impeller can suck the flue gas generated when the pulverized coal burner is working into the heat exchange tube. Then, the hot flue gas can contact the diversion pipe when flowing inside the heat exchange tube, so that the normal temperature airflow inside the diversion pipe can exchange heat with the hot flue gas inside the heat exchange tube, so that the primary air is preheated and has a certain temperature, which helps the pulverized coal to quickly reach the ignition temperature after entering the furnace, reduces the heat required for ignition, and thus facilitates the subsequent pulverized coal burner to maintain the temperature.

[0014] The utility model has obvious heat exchange effect when in use, and the contact area between the incoming air flow and the hot air can be greatly increased through the multiple diversion pipes, thereby improving the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the overall structure of the primary air nozzle of a pulverized coal burner of the utility model;

[0016] Figure 2 This is a cross-sectional view of a primary air nozzle of a pulverized coal burner according to the present invention;

[0017] Figure 3 This is a top view of the primary air nozzle of a pulverized coal burner of the utility model.

[0018] In the figure: 1. First fan; 2. Connecting joint; 3. Air outlet; 4. Diverter pipe; 5. Heat exchange pipe; 6. Smoke inlet pipe; 7. Smoke outlet pipe; 8. Second fan; 9. Impeller; 10. Motor; 11. Feed inlet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3 The utility model provides a technical solution: a primary air nozzle of a pulverized coal burner, comprising a first fan 1, a connecting joint 2 is fixedly provided on one side of the surface of the first fan 1, an air outlet 3 is fixedly provided on the side of the surface of the connecting joint 2 away from the first fan 1, a preheating mechanism for preheating the air flow is provided between the air outlet 3 and the connecting joint 2, the preheating mechanism comprises a diverter pipe 4, a heat exchange pipe 5, a smoke inlet pipe 6, a smoke outlet pipe 7, and a second fan 8, a plurality of diverter pipes 4 are evenly fixed on the outer surface of the connecting joint 2, a heat exchange pipe 5 is fixedly provided on the outer side of the diverter pipe 4, a smoke inlet pipe 6 is fixedly provided on the lower end of the heat exchange pipe 5, a smoke outlet pipe 7 is fixedly provided on the upper end of the heat exchange pipe 5, and a second fan 8 is fixedly provided on the upper end of the smoke outlet pipe 7.

[0021] The first fan 1 and the second fan 8 are both provided with impellers 9 through the movable shaft. The high-speed rotation of the impeller 9 can achieve the effect of supplying or sucking air. When supplying air, the first fan 1 can send the airflow into the diverter pipe 4 and the air outlet 3, and when sucking air, it can suck the flue gas generated by the pulverized coal burner into the heat exchange tube 5. Then, when flowing inside the heat exchange tube 5, the hot flue gas can contact the diverter pipe 4. In this way, the normal temperature airflow inside the diverter pipe 4 can exchange heat with the hot flue gas inside the heat exchange tube 5. In this way, the primary air is preheated and has a certain temperature, which helps the pulverized coal to quickly reach the ignition temperature after entering the furnace, thereby reducing the heat required for ignition.

[0022] The outer surface of the heat exchange tube 5 is provided with an insulation layer, which can prevent the heat of the flue gas inside the heat exchange tube 5 from dissipating outward, thereby saving energy;

[0023] An electric motor 10 is fixedly provided on the outside of the first fan 1 and the second fan 8. The output shaft end of the electric motor 10 is transmission-connected to the impeller 9 via a coupling, and the electric motor 10 can conveniently drive the impeller 9 to rotate.

[0024] A feed port 11 is fixedly provided at the upper end of the air outlet 3, through which pulverized coal can be conveniently added to the air outlet 3, so that the hot air can drive the pulverized coal into the pulverized coal burner for combustion.

[0025] The shunt pipe 4 is made of heat-conducting metal material. The shunt pipe 4 of the device can be made of copper or other metal materials as needed to achieve better heat conduction and heat exchange effects.

[0026] Working principle: When using this device, the first fan 1 can send air into the diverter pipe 4 and the air outlet 3, while during suction, the second fan 8 and the impeller 9 can suck the flue gas generated by the pulverized coal burner into the heat exchange tube 5. Then, when flowing inside the heat exchange tube 5, the hot flue gas can contact the diverter pipe 4. In this way, the normal temperature air flow inside the diverter pipe 4 can exchange heat with the hot flue gas inside the heat exchange tube 5. In this way, the primary air is preheated and has a certain temperature, which helps the pulverized coal quickly reach the ignition temperature after entering the furnace, reducing the heat required for ignition.

[0027] Furthermore, the heat exchange effect is obvious when the device is used. The contact area between the incoming air flow and the hot air can be greatly increased through the multiple diversion pipes 4, thereby improving the heat exchange effect.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A primary air nozzle of a pulverized coal burner, comprising a first fan (1), characterized in that: A connecting joint (2) is fixedly provided on one side of the surface of the first fan (1), an air outlet (3) is fixedly provided on the side of the surface of the connecting joint (2) away from the first fan (1), a preheating mechanism for preheating the airflow is provided between the air outlet (3) and the connecting joint (2), the preheating mechanism comprising a diverter pipe (4), a heat exchange pipe (5), a smoke inlet pipe (6), a smoke outlet pipe (7), and a second fan (8), a plurality of diverter pipes (4) are evenly fixedly provided on the outer surface of the connecting joint (2), a heat exchange pipe (5) is fixedly provided on the outer side of the diverter pipe (4), a smoke inlet pipe (6) is fixedly provided on one side of the lower end of the heat exchange pipe (5), a smoke outlet pipe (7) is fixedly provided on one side of the upper end of the heat exchange pipe (5), and a second fan (8) is fixedly provided on the upper end of the smoke outlet pipe (7).

2. The primary air nozzle of a pulverized coal burner according to claim 1, characterized in that: Impellers (9) are movably provided inside the first fan (1) and the second fan (8) via rotating shafts.

3. The primary air nozzle of a pulverized coal burner according to claim 1, characterized in that: The outer surface of the heat exchange tube (5) is provided with a thermal insulation layer.

4. The primary air nozzle of a pulverized coal burner according to claim 1, characterized in that: An electric motor (10) is fixedly provided on the outside of each of the first fan (1) and the second fan (8), and the output shaft end of the electric motor (10) is transmission-connected to the impeller (9) via a coupling.

5. The primary air nozzle of a pulverized coal burner according to claim 1, characterized in that: A feed port (11) is fixedly provided at the upper end of the air outlet (3).

6. The primary air nozzle of a pulverized coal burner according to claim 1, characterized in that: The diverter pipe (4) is made of a heat-conducting metal material.

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