Ultra-low oxynitride emission device stable and uniform in combustion

Abstract

The utility model relates to the technical field of ultralow oxynitride emission, in particular to an ultralow oxynitride emission device stable and uniform in combustion, which comprises a shell, a spray pipe is arranged at the upper end of the right side of the shell, and an annular collecting cover is arranged at the right end of the spray pipe. A plurality of vent holes distributed at equal angles are formed in the right side of the annular collecting cover, a partition plate is fixedly connected to the lower end of the inner cavity of the shell, a plurality of mixing plates distributed at equal intervals are fixedly connected between the bottom of the partition plate and the bottom of the inner cavity of the shell, and a plurality of mixing through grooves distributed at equal intervals are formed in the inner surfaces of the mixing plates. Through cooperation of the structures, the device has the advantage of being stable and uniform in combustion, and the problems that in the using process of an existing ultralow oxynitride discharging device, combustion is unstable and uneven after fuel gas is conveyed, the discharged oxynitride content is high, and the environment-friendly emission development requirement cannot be met are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-low nitrogen oxide emissions, and specifically relates to an ultra-low nitrogen oxide emission device with stable and uniform combustion. Background Technique

[0002] Ultra-low nitrogen oxide emissions refer to the process of emissions from coal-fired boilers in thermal power plants. By adopting a multi-pollutant efficient collaborative removal integrated system technology, the emission concentration of nitrogen oxides reaches a very low level. Specifically, this emission standard requires that the emission concentration of nitrogen oxides does not exceed 50 mg / m 3 .

[0003] Currently, during the use of existing ultra-low nitrogen oxide emission devices, the combustion after gas transportation is unstable and uneven, resulting in a relatively high emission of nitrogen oxides and unable to meet the development needs of environmental protection emissions. Therefore, we propose an ultra-low nitrogen oxide emission device with stable and uniform combustion. Content of the Utility Model

[0004] The purpose of the utility model is to provide an ultra-low nitrogen oxide emission device with stable and uniform combustion, which has the advantages of stable and uniform combustion, and solves the problem that during the use of existing ultra-low nitrogen oxide emission devices, the combustion after gas transportation is unstable and uneven, resulting in a relatively high emission of nitrogen oxides and unable to meet the development needs of environmental protection emissions.

[0005] To achieve the above object, the utility model provides the following technical solutions: An ultra-low nitrogen oxide emission device with stable and uniform combustion, including a housing. At the upper end of the right side of the housing, there is a spray pipe. At the right end of the spray pipe, there is an annular collection hood. A plurality of equally-angularly distributed ventilation holes are opened on the right side of the annular collection hood. At the lower end of the inner cavity of the housing, there is a partition board fixedly connected. Between the bottom of the partition board and the bottom of the inner cavity of the housing, there are a plurality of equally-spaced mixed plates fixedly connected. On the inner surface of the mixed plates, there are a plurality of equally-spaced mixed through grooves. On the inner surface of the spray pipe, there are a plurality of equally-angularly distributed air guiding pipes. The left end of the air guiding pipe is communicated with an air inlet ring. Both the front and rear sides of the air inlet ring are communicated with a diversion pipe, and the end of the diversion pipe far from the air inlet ring is communicated with the left end of the top of the partition board. At the left and right ends of the inner cavity of the spray pipe, a left fixing ring and a right fixing ring are respectively fixedly connected. On the inner surfaces of the left fixing ring and the right fixing ring, there are a plurality of equally-angularly distributed secondary fuel delivery pipes. The left end of the secondary fuel delivery pipe is communicated with an air equalizing ring. At the right end of the top of the partition board, a negative pressure fan is fixedly installed. Inside the right fixing ring, there is a mixed spray barrel fixedly connected. The left side of the mixed spray barrel is communicated with a return pipe that is Y-shaped connected to the right end of the secondary fuel delivery pipe. Between the upper end of the left side of the housing and the middle end of the left side of the mixed spray barrel, there is an ignition pipe communicated. On the outer surface of the ignition pipe and located on the mixed spray barrel, there is a nozzle with through holes opened on the inner surface.

[0006] Preferably, the air guiding pipe is inclined, and the right end of the air guiding pipe extends to the inside of the annular collection hood.

[0007] Preferably, the air inlet end of the negative pressure fan extends to the lower end of the inner cavity of the housing through a pipe, and the air outlet end of the negative pressure fan is communicated with the air equalizing ring through a pipe.

[0008] Preferably, the mixed spray barrel is a columnar structure with a hollow interior and a through hole opened at the middle end of the right side.

[0009] Preferably, between the lower end of the inner cavity of the housing and inside the mixed plates, there is a heat exchange pipe. The left end of the heat exchange pipe is communicated with a primary fuel delivery pipe extending to the outside of the left side of the housing. At the left end of the primary fuel delivery pipe, there is a control valve.

[0010] Preferably, the end of the heat exchange pipe far from the primary fuel delivery pipe is communicated with a gas guiding pipe, and the end of the gas guiding pipe far from the heat exchange pipe is communicated with the left end of the ignition pipe.

[0011] Preferably, at the right end of the inner cavity of the spray pipe, there is an annular refractory plate fixedly connected. On the inner surface of the annular refractory plate, there are a plurality of equally-angularly distributed refractory spray pipes, and the right end of the secondary fuel delivery pipe is communicated with the left end of the refractory spray pipe.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. After the fuel is sent into the mixing spray tube through the ignition tube and ignited in the present utility model, with the assistance of the nozzle, the ejected flame can have a reflux mixture due to the through holes on the inner surface of the nozzle and the main structure of the mixing spray tube, making the distribution of the combustion temperature field uniform and avoiding the situation of local high temperature during the combustion process. The flame burns in the nozzle at the center of the spray tube and the mixing spray tube, ensuring the stability during the flame combustion process. The partial flame and flue gas of the mixed reflux can enter the secondary fuel delivery tube through the reflux tube. When the negative pressure fan works, it can send the mixed gas at the lower end of the inner cavity of the shell into the air distribution ring through the pipeline. Then, the gas in the air distribution ring is evenly dispersed to the left end of the secondary fuel delivery tube. When the mixed gas enters the secondary fuel delivery tube and flows from left to right, it can converge with the partial flame of the mixed reflux, be ignited and then ejected outward for combustion. When the negative pressure fan sends the mixed gas at the lower end of the inner cavity of the shell outward, the lower end of the inner cavity of the shell is in a negative pressure state, which can force the external gas to carry the unburned flue gas into the annular collection hood through the ventilation holes. Then, it enters the intake ring through the annular collection hood and the air guide pipe, and is introduced into the lower end of the inner cavity of the shell through the diversion pipe. With the assistance of the mixing plate and the mixing through groove, when the external gas carries the unburned flue gas and flows from left to right at the lower end of the inner cavity of the shell, it can fully mix the introduced external gas and flue gas, be sucked by the negative pressure fan and sent into the secondary fuel delivery tube, and can burn the flue gas again after mixing, greatly reducing the emission concentration of nitrogen oxides.

[0014] 2. Through the arrangement of the heat exchange tube in the present utility model, when the primary fuel delivery tube delivers fuel into the heat exchange tube, when the external gas carries the unburned flue gas and flows from left to right at the lower end of the inner cavity of the shell, it can preheat the fuel in the heat exchange tube through the waste heat in the flue gas. The preheated fuel can reduce the emission concentration of nitrogen oxides after being ignited, which is beneficial to environmental protection emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the structural schematic diagram of the first perspective of the present utility model;

[0016] Figure 2 is the structural schematic diagram of the second perspective of the present utility model;

[0017] Figure 3 is the sectional structural schematic diagram of the third perspective of the present utility model;

[0018] Figure 4 is the structural schematic diagram of the internal part of the present utility model.

[0019] In the figure: 1. housing; 2. nozzle; 3. annular collection hood; 4. ventilation hole; 5. annular refractory plate; 6. refractory nozzle; 7. ignition tube; 8. air guide tube; 9. primary fuel delivery pipe; 10. control valve; 11. partition board; 12. heat exchange tube; 13. mixing plate; 14. mixing through groove; 15. mixing nozzle; 16. nozzle; 17. secondary fuel delivery pipe; 18. right fixing ring; 19. return pipe; 20. diversion pipe; 21. negative pressure fan; 22. air equalizing ring; 23. air inlet ring; 24. air induction pipe; 25. left fixing ring. Specific implementation manner

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0021] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0023] The components of the housing 1, nozzle 2, annular collection hood 3, vent holes 4, annular refractory plate 5, refractory nozzle 6, ignition tube 7, air guide tube 8, primary fuel delivery tube 9, control valve 10, partition plate 11, heat exchange tube 12, mixing plate 13, mixing through slots 14, mixing nozzle 15, nozzle 16, secondary fuel delivery tube 17, right fixing ring 18, return pipe 19, diversion pipe 20, negative pressure fan 21, air equalizing ring 22, air inlet ring 23, air intake pipe 24 and left fixing ring 25 of this application are all common standard components or components known to those skilled in the art. Their structures and principles can all be learned by those skilled in the art through technical manuals or obtained through conventional experimental methods.

[0024] Embodiment 1

[0025] Please refer to Figures 1-4 As shown in the figure, the present utility model provides a technical solution: an ultra-low nitrogen oxide emission device with stable and uniform combustion, including a housing 1. At the upper end of the right side of the housing 1, there is a nozzle 2. At the right end of the nozzle 2, there is an annular collection hood 3. On the right side of the annular collection hood 3, a plurality of vent holes 4 are arranged at equal angles. At the lower end of the inner cavity of the housing 1, a partition plate 11 is fixedly connected. Between the bottom of the partition plate 11 and the bottom of the inner cavity of the housing 1, a plurality of mixing plates 13 are fixedly connected at equal distances. On the inner surface of the mixing plate 13, a plurality of mixing through slots 14 are arranged at equal distances. On the inner surface of the nozzle 2, a plurality of air intake pipes 24 are arranged at equal angles. The air intake pipes 24 are inclined, and the right end of the air intake pipe 24 extends to the inside of the annular collection hood 3. The left end of the air intake pipe 24 is communicated with an air inlet ring 23. Both the front and rear sides of the air inlet ring 23 are communicated with a diversion pipe 20, and the end of the diversion pipe 20 away from the air inlet ring 23 is communicated with the left end of the top of the partition plate 11. At the left and right ends of the inner cavity of the nozzle 2, a left fixing ring 25 and a right fixing ring 18 are respectively fixedly connected. On the inner surfaces of the left fixing ring 25 and the right fixing ring 18, a plurality of secondary fuel delivery tubes 17 are fixedly connected at equal angles. The left end of the secondary fuel delivery tube 17 is communicated with an air equalizing ring 22. At the right end of the top of the partition plate 11, a negative pressure fan 21 is fixedly installed. The air inlet end of the negative pressure fan 21 extends to the lower end of the inner cavity of the housing 1 through a pipeline, and the air outlet end of the negative pressure fan 21 is communicated with the air equalizing ring 22 through a pipeline. Inside the right fixing ring 18, a mixing nozzle 15 is fixedly connected. The mixing nozzle 15 is a columnar structure with a hollow interior and a through hole opened at the middle of the right side. The left side of the mixing nozzle 15 is communicated with a return pipe 19 that is Y-shaped communicated with the right end of the secondary fuel delivery tube 17. Between the upper end of the left side of the housing 1 and the middle of the left side of the mixing nozzle 15, an ignition tube 7 is communicated. The ignition tube 7 is fixedly connected to the outer surface of the mixing nozzle 15 and has a through hole opened on the inner surface.

[0026] Technical solution: After the fuel is sent into the mixing nozzle 15 through the ignition tube 7 and ignited, with the assistance of the nozzle 16, the ejected flame can have a reflux mixture due to the through holes on the inner surface of the nozzle 16 and the main structure of the mixing nozzle 15, making the combustion temperature field distribution uniform and avoiding local high temperature during the combustion process. The flame burns in the nozzle 16 and the mixing nozzle 15 at the center of the nozzle tube 2, ensuring the stability of the flame combustion process. Part of the flame and flue gas with mixed reflux can enter the secondary fuel delivery pipe 17 through the reflux pipe 19. When the negative pressure fan 21 operates, it can send the mixed gas at the lower end of the inner cavity of the housing 1 into the air distribution ring 22 through a pipeline. Then, the gas in the air distribution ring 22 is evenly dispersed to the left end of the secondary fuel delivery pipe 17. When the mixed gas enters the secondary fuel delivery pipe 17 and flows from left to right, it can converge with part of the flame with mixed reflux, be ignited and then ejected outward for combustion. When the negative pressure fan 21 sends the mixed gas at the lower end of the inner cavity of the housing 1 outward, the lower end of the inner cavity of the housing 1 is in a negative pressure state, which can force the outside gas to carry the unburned flue gas into the annular collection hood 3 through the ventilation holes 4. Then, it enters the intake ring 23 through the annular collection hood 3 and the air guide pipe 24, and is introduced into the lower end of the inner cavity of the housing 1 by the diversion pipe 20. With the assistance of the mixing plate 13 and the mixing through slots 14, when the outside gas carries the unburned flue gas and flows from left to right at the lower end of the inner cavity of the housing 1, it can fully mix the introduced outside gas and flue gas (at this time, an oxygen delivery pipe can be arranged at the lower left end of the housing 1 to fully mix the outside gas and the flue gas, ensuring more complete combustion of the flue gas and part of the flame with mixed reflux. The oxygen delivery pipe is not shown in the figure here). After being sucked by the negative pressure fan 21 and sent into the secondary fuel delivery pipe 17, the flue gas can be burned again after mixing, greatly reducing the emission concentration of nitrogen oxides.

[0027] Embodiment 2

[0028] Based on Embodiment 1, as shown in the present utility model Figures 1-4 An exchange heat pipe 12 is arranged between the lower end of the inner cavity of the housing 1 and inside the mixing plate 13. The left end of the exchange heat pipe 12 is communicated with a primary fuel delivery pipe 9 extending to the outside of the left side of the housing 1. A control valve 10 is arranged at the left end of the primary fuel delivery pipe 9. The end of the exchange heat pipe 12 away from the primary fuel delivery pipe 9 is communicated with a gas guide pipe 8, and the end of the gas guide pipe 8 away from the exchange heat pipe 12 is communicated with the left end of the ignition tube 7.

[0029] Technical solution: Through the arrangement of the exchange heat pipe 12, when the primary fuel delivery pipe 9 delivers fuel into the exchange heat pipe 12, when the outside gas carries the unburned flue gas and flows from left to right at the lower end of the inner cavity of the housing 1, it can preheat the fuel in the exchange heat pipe 12 through the waste heat in the flue gas. The preheated fuel can reduce the emission concentration of nitrogen oxides after being ignited, which is beneficial to environmental protection emissions.

[0030] Embodiment 3

[0031] Based on Embodiment 1, the present utility model is as Figures 1-4 shown, and it is disclosed that a ring-shaped refractory plate 5 is fixedly connected to the right end of the inner cavity of the nozzle 2. A plurality of refractory nozzles 6 are arranged on the inner surface of the ring-shaped refractory plate 5 at equal angles, and the right end of the secondary fuel delivery pipe 17 communicates with the left end of the refractory nozzle 6.

[0032] In this technical solution: through the arrangement of the ring-shaped refractory plate 5 and the refractory nozzle 6, the device can improve the high-temperature resistance during flame combustion and extend the service life of the device.

[0033] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible on the premise of substantially not deviating from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes and proportions of various elements, and parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature, number or position of discrete elements can be changed or altered. Therefore, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structure that performs the recited function in this disclosure, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to a specific embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0034] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently considered best mode of implementing the present utility model, or those features that are not relevant to the implementation of the present utility model).

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present utility model.

Claims

1. An ultra-low nitrogen oxide emission device with stable and uniform combustion, comprising a housing (1), characterized in that: At the upper end on the right side of the housing (1), a nozzle (2) is provided. At the right end of the nozzle (2), an annular collecting hood (3) is provided. On the right side of the annular collecting hood (3), a plurality of ventilation holes (4) are provided at equal angular intervals. At the lower end of the inner cavity of the housing (1), a partition plate (11) is fixedly connected. Between the bottom of the partition plate (11) and the bottom of the inner cavity of the housing (1), a plurality of mixing plates (13) are fixedly connected at equal intervals. On the inner surface of the mixing plate (13), a plurality of mixing through grooves (14) are provided at equal intervals. On the inner surface of the nozzle (2), a plurality of air guiding pipes (24) are provided at equal angular intervals. The left end of the air guiding pipe (24) is communicated with an air inlet ring (23). Both the front and rear sides of the air inlet ring (23) are communicated with a flow guiding pipe (20), and the end of the flow guiding pipe (20) far away from the air inlet ring (23) is communicated with the left end of the top of the partition plate (11). At the left and right ends of the inner cavity of the nozzle (2), a left fixing ring (25) and a right fixing ring (18) are respectively fixedly connected. On the inner surfaces of the left fixing ring (25) and the right fixing ring (18), a plurality of secondary fuel delivery pipes (17) are fixedly connected at equal angular intervals. The left end of the secondary fuel delivery pipe (17) is communicated with an air equalizing ring (22). At the right end of the top of the partition plate (11), a negative pressure blower (21) is fixedly installed. Inside the right fixing ring (18), a mixing spray barrel (15) is fixedly connected. The left side of the mixing spray barrel (15) is communicated with a return pipe (19) which is Y-shaped communicated with the right end of the secondary fuel delivery pipe (17). Between the upper end on the left side of the housing (1) and the middle end on the left side of the mixing spray barrel (15), an ignition pipe (7) is communicated. On the outer surface of the ignition pipe (7) located at the mixing spray barrel (15), a nozzle (16) with through holes opened on the inner surface is fixedly connected.

2. The ultra-low nitrogen oxide emission device with stable and uniform combustion according to claim 1, characterized in that: The air guiding pipe (24) is inclined, and the right end of the air guiding pipe (24) extends to the inside of the annular collecting hood (3).

3. An ultra-low nitrogen oxide emission device with stable and uniform combustion according to claim 1, characterized in that: The air inlet end of the negative pressure blower (21) extends to the lower end of the inner cavity of the housing (1) through a pipe, and the air outlet end of the negative pressure blower (21) is communicated with the air equalizing ring (22) through a pipe.

4. An ultra-low nitrogen oxide emission device with stable and uniform combustion according to claim 1, characterized in that: The mixing spray barrel (15) is a columnar structure with a hollow interior and a through hole opened at the middle end on the right side.

5. An ultra-low nitrogen oxide emission device with stable and uniform combustion, according to claim 1, characterized in that: Between the lower end of the inner cavity of the housing (1) and inside the mixing plate (13), a heat exchange pipe (12) is provided. The left end of the heat exchange pipe (12) is communicated with a primary fuel delivery pipe (9) extending to the outside of the left side of the housing (1). At the left end of the primary fuel delivery pipe (9), a control valve (10) is provided.

6. An ultra-low nitrogen oxide emission device with stable and uniform combustion, according to claim 5, wherein: The end of the heat exchange pipe (12) far away from the primary fuel delivery pipe (9) is communicated with a gas guiding pipe (8), and the end of the gas guiding pipe (8) far away from the heat exchange pipe (12) is communicated with the left end of the ignition pipe (7).

7. An ultra-low nitrogen oxide emission device with stable and uniform combustion, according to claim 1, characterized in that: At the right end of the inner cavity of the nozzle (2), an annular refractory plate (5) is fixedly connected. On the inner surface of the annular refractory plate (5), a plurality of refractory nozzles (6) are provided at equal angular intervals, and the right end of the secondary fuel delivery pipe (17) is communicated with the left end of the refractory nozzle (6).

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