Pure oxygen pulverized coal burner

Abstract

The invention relates to a pure oxygen pulverized coal burner which comprises a pulverized coal bin, a pulverized coal conveying cylinder, an oxygen header pipe, oxygen spray pipes and burner blocks. The oxygen spray pipe and the pulverized coal conveying cylinder extend into the burner block; a pulse valve is arranged on the oxygen spraying pipe, an accumulation groove and a pulverized coal striking head are arranged at the tail end of the pulverized coal conveying barrel, pulverized coal falls into the accumulation groove through conveying of the pulverized coal conveying barrel, and the pulverized coal striking head is connected with a striking head driving motor through a striking head transmission shaft to rotate at a high speed to strike the pulverized coal falling into the accumulation groove. Compared with the prior art, the pulse jet oxygen is supplied after the pulverized coal is scattered and scattered, so that the torch time is effectively shortened, and the thermal radiation of a continuous combustion torch to a nozzle is eliminated to a great extent. The supply of the pulverized coal and the supply of the oxygen can be flexibly controlled through the opening and closing interval time of the valve, and the power of the combustor can be conveniently adjusted according to the required furnace temperature and heat supply amount, so that the oxygen and the pulverized coal can be fully and uniformly mixed regardless of the power, and the optimal air-fuel ratio is achieved.

Description

Technical Field

[0001] This invention belongs to the field of burner technology, specifically relating to a pure oxygen pulverized coal burner. Background Technology

[0002] A pure oxygen pulverized coal burner is a combustion device that uses pure oxygen as a combustion aid, used in industrial furnaces or power plant boilers that use pulverized coal as fuel. This type of burner uses a high concentration of oxygen (typically greater than 80%) instead of traditional air for combustion, because pure oxygen does not contain inert gases and does not carry away a large amount of heat. This improves combustion efficiency, reduces flue gas emissions, and lowers fuel costs. Pure oxygen combustion can significantly reduce nitrogen oxide (NOx) emissions because almost no nitrogen participates in the reaction during combustion. Pure oxygen pulverized coal burners are widely used in industrial fields requiring high-efficiency combustion and low emissions. The structural design of a pure oxygen pulverized coal burner typically includes a nozzle and an air inlet pipe. The nozzle has a through-hole first air hole and a second air hole, with the second air hole distributed in a ring array on the nozzle. The first air pipe introduces air carrying pulverized coal, using the flowing air as the medium to drive the movement of the pulverized coal. Typically, the amount of air is far insufficient to supply the pulverized coal for complete combustion. While pure oxygen combustion has the advantages of high efficiency and low emissions, it also has certain safety hazards, especially the problem of excessively high flare temperatures leading to short nozzle life and high failure rates due to the heat exchanger. Therefore, when designing pure oxygen pulverized coal burners, safety measures such as water cooling devices are usually adopted to ensure the safety and stability of the equipment during operation.

[0003] In view of this, the present invention is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a pure oxygen pulverized coal burner to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A pure oxygen pulverized coal burner includes a pulverized coal bin, a pulverized coal conveying cylinder, an oxygen main pipe, an oxygen injection pipe, and a burner brick; the oxygen injection pipe and the pulverized coal conveying cylinder extend into the burner brick.

[0007] A pulse valve is installed on the oxygen nozzle, and a sump and a pulverized coal impact head are installed at the end of the pulverized coal conveying cylinder. Pulverized coal falls into the sump through the conveying cylinder. The pulverized coal impact head is connected to an impact head drive motor via an impact head drive shaft to rotate at high speed and impact the pulverized coal falling into the sump.

[0008] Preferably, the pulverized coal conveying cylinder is provided with a spiral conveying mechanism, which includes a spiral conveying shaft and spiral conveying plates located on the spiral conveying shaft. The spiral conveying shaft is driven to rotate by a spiral conveying motor, thereby driving the spiral conveying plates to transport the pulverized coal forward.

[0009] Preferably, the striking head drive shaft is located inside the spiral conveyor shaft.

[0010] Preferably, the spiral conveyor shaft and the striking head drive shaft are arranged concentrically.

[0011] Preferably, there are two oxygen nozzles, which are respectively located at the upper and lower ends of the pulverized coal conveying cylinder.

[0012] Preferably, the outside of the accumulation trough is also covered with an accumulation trough shielding block.

[0013] Preferably, one end of the stacking trough shielding block is connected to the impact head drive shaft, and the other end is connected to the pulverized coal conveying cylinder.

[0014] Compared with existing technologies, the advantages of this invention are: The use of pulsed oxygen injection, supplied after the pulverized coal is dispersed and scattered, effectively reduces flare time and largely eliminates the heat radiation from a continuously burning flare to the nozzle. Both the pulverized coal and oxygen supply can be flexibly controlled by the valve opening and closing intervals, allowing for convenient adjustment of the burner power according to the required furnace temperature and heat supply. This ensures that regardless of the power level, oxygen and pulverized coal are thoroughly mixed to achieve the optimal air-fuel ratio.

[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a pure oxygen pulverized coal burner provided in an embodiment of the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of line AA in the middle.

[0019] Figure 3 for Figure 1 A schematic diagram of the BB line.

[0020] Figure 4 for Figure 1 A schematic diagram of the CC line.

[0021] The diagram is shown below:

[0022] 1. Pulverized coal silo; 2. Pulverized coal silo inlet; 3. Oxygen main pipe; 4. Oxygen main pipe inlet; 5. Oxygen nozzle one; 6. Oxygen nozzle two; 7. Pulverized coal impact head; 8. Pulverized coal conveying cylinder; 9. Accumulation trough; 10. Impact head drive shaft; 11. Screw conveyor plate; 12. Accumulation trough shielding block; 13. Screw conveyor motor; 14. Impact head drive motor; 15. Burner brick. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] like Figure 1-4 As shown in the figure, an embodiment of the present invention provides a pure oxygen pulverized coal burner, including a pulverized coal bin 1, a pulverized coal conveying cylinder 8, an oxygen main pipe 3, an oxygen nozzle, and a burner brick 15; the oxygen nozzle and the pulverized coal conveying cylinder 8 extend into the burner brick 15; a pulse valve is provided on the oxygen nozzle; a sump 9 and a pulverized coal impact head 7 are provided at the end of the pulverized coal conveying cylinder 8; pulverized coal falls into the sump 9 through the conveying of the pulverized coal conveying cylinder 8; the pulverized coal impact head 7 is connected to an impact head drive motor 14 via an impact head drive shaft 10 to rotate at high speed and impact the pulverized coal falling into the sump 9. An oxygen main pipe inlet 4 is provided on the oxygen main pipe 3, and a pulverized coal bin inlet 2 is provided on the pulverized coal bin 1. In this invention, for ease of description, the burner flame nozzle is referred to as the front, and the oxygen and pulverized coal inlets as the rear.

[0025] The burner of this invention employs pulsed oxygen injection, supplied after the pulverized coal is dispersed and scattered. This effectively reduces flare time and largely eliminates the heat radiation from a continuously burning flare to the nozzle. Both the pulverized coal and oxygen supply can be flexibly controlled via valve opening and closing intervals. The burner power can be easily adjusted according to the required furnace temperature and heat supply, ensuring thorough mixing of oxygen and pulverized coal regardless of power output, achieving the optimal air-fuel ratio.

[0026] This invention provides a pure oxygen pulverized coal burner. The pulverized coal conveying cylinder 8 is equipped with a spiral conveying mechanism, which includes a spiral conveying shaft and spiral conveying blades 11 located on the shaft. The spiral conveying shaft is driven to rotate by a spiral conveying motor 13, thereby driving the spiral conveying blades 11 to transport pulverized coal forward. The impact head drive shaft 10 is located inside the spiral conveying shaft, and the spiral conveying shaft and the impact head drive shaft 10 are concentrically arranged. In this invention, the method by which pulverized coal enters the pulverized coal silo 1 is not within the scope of protection. Regardless of the method used, the pulverized coal silo 1 should always contain sufficient pulverized coal to ensure that the spiral conveying blades 11 of the pulverized coal conveying cylinder 8 can rotate to transport pulverized coal forward.

[0027] This invention provides a pure oxygen pulverized coal burner, wherein there are two oxygen nozzles, which are respectively located at the upper and lower ends of the pulverized coal conveying cylinder 8. In this invention, the oxygen inlet is divided into two streams, namely oxygen nozzle 5 and oxygen nozzle 6, each equipped with a fast-opening pulse-type solenoid valve, and then enters the furnace parallel to the central pulverized coal conveying cylinder 8.

[0028] This invention does not include the electrical and programming design of valves and control systems. The motors and automatic control systems only need to perform the described functions, and detailed design is required separately and is not within the scope of protection of this patent.

[0029] This invention provides a pure oxygen pulverized coal burner, in which a sump shielding block 12 is also provided to cover the outside of the sump 9. One end of the sump shielding block 12 is connected to the impact head drive shaft, and the other end is connected to the pulverized coal conveying cylinder 8. This also serves as a support for the impact head drive shaft.

[0030] In summary, to overcome the shortcomings of existing technologies such as excessively high flame temperature and short equipment lifespan, this invention uses a pure oxygen pulverized coal burner to mechanically convey pulverized coal to the oxygen nozzle and spray it by mechanical impact, while simultaneously injecting oxygen in a pulse manner, thus changing continuous combustion to pulsed combustion and solving the problem of excessively high flare temperature.

[0031] In summary, to overcome the shortcomings of existing technologies such as excessively high flame temperature and short equipment lifespan, this invention uses a pure oxygen pulverized coal burner to mechanically convey pulverized coal to the oxygen nozzle and spray it by mechanical impact, while simultaneously injecting oxygen in a pulse manner, thus changing continuous combustion to pulsed combustion and solving the problem of excessively high flare temperature.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A pure oxygen pulverized coal burner characterized by, The burner brick is provided with a coal powder bin, a coal powder conveying cylinder, an oxygen main pipe, an oxygen injection pipe and a burner brick. A pulse valve is arranged on the oxygen injection pipe, and the end of the coal powder conveying cylinder is provided with a stacking groove and a coal powder beating head.

2. A pure oxygen coal burner according to claim 1, wherein The coal powder conveying cylinder is provided with a spiral conveying mechanism, which comprises a spiral conveying shaft and spiral conveying blades arranged on the spiral conveying shaft.

3. A pure oxygen coal burner according to claim 2, wherein The beating head transmission shaft is arranged inside the spiral conveying shaft.

4. A pure oxygen coal burner according to claim 3, wherein The spiral conveying shaft and the beating head transmission shaft are arranged concentrically.

5. A pure oxygen coal burner according to claim 4, wherein The number of the oxygen injection pipes is two, and each is arranged on the upper and lower ends of the coal powder conveying cylinder.

6. A pure oxygen coal burner according to claim 5, wherein The stacking groove is further covered with a stacking groove shielding block.

7. A pure oxygen coal burner according to claim 6, wherein One end of the stacking groove shielding block is connected with the beating head driving shaft, and the other end is connected with the coal powder conveying cylinder.

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