CN120101137A - Swirl burner with ammonia flue gas circulation - Google Patents

Abstract

The invention discloses a cyclone burner for ammonia-doped flue gas circulation, which comprises an ammonia fuel pipe, a flue pipe and a primary air pipe component, wherein the ammonia fuel pipe comprises a flow section and an outflow section, a plurality of outflow holes are formed in the peripheral wall of the outflow section, a diversion refractory mechanism is arranged on the peripheral wall of one end of the flue pipe, which is close to an outlet end, the outer diameter of a first section of the diversion refractory mechanism is gradually increased, the outer diameter of a second section of the diversion refractory mechanism is unchanged, the outer diameter of a third section of the diversion refractory mechanism is gradually reduced, the primary air pipe component is sleeved outside the flue pipe and together with the flue pipe to define a primary air channel for conveying primary air and pulverized coal, one end of the primary air pipe component, which is close to the outlet end, is provided with a horn mouth, and one end of the flue pipe, which is close to the outlet end, does not exceed the flow section along the direction from the inlet end to the outlet end. According to the cyclone burner provided by the invention, the reduction effect of ammonia fuel on NOx generated by pulverized coal combustion can be enhanced, the generation of NOx is reduced, and the environmental protection performance of the cyclone burner in the use process is improved.

Description

Cyclone burner for ammonia-doped flue gas circulation

Technical Field

The invention mainly relates to the technical field of combustors, in particular to a cyclone combustor for recycling ammonia-doped flue gas.

Background

In the prior art, ammonia coal is mixed to be used as power generation fuel of a coal-fired power plant, carbon emission reduction of a power system can be realized, and the technology accords with the energy national conditions of China. However, the problems of high NOx emission and the like caused by the ammonia-doped combustion affect the environmental protection performance of the cyclone burner in the use process.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the cyclone burner with the ammonia-doped flue gas circulation, which can enhance the reduction effect of ammonia fuel on NOx generated by pulverized coal combustion, reduce the generation of NOx and promote the environmental protection property of the cyclone burner in the use process.

According to the embodiment of the invention, the cyclone burner comprises an ammonia fuel pipe, a flue pipe and a primary air pipe assembly, wherein the ammonia fuel pipe comprises a flow section and an outflow section, the two axial ends of the flow section are respectively an inlet end and an outlet end, one axial end of the outflow section is connected with the outlet end of the flow section, the other axial end of the outflow section is closed, the peripheral wall of the outflow section is inclined towards the direction close to the axis of the outflow section along the direction from the inlet end to the outlet end, a plurality of outflow holes are formed in the peripheral wall of the outflow section, and the plurality of outflow holes are sequentially arranged at intervals along the circumferential direction of the outflow section; the flue gas pipe is sleeved outside the ammonia fuel pipe and together with the ammonia fuel pipe to define a flue gas channel, a flow guide refractory mechanism is arranged on the peripheral wall of one end, close to the outlet end, of the flue gas pipe, extends into a ring shape along the circumferential direction of the flue gas pipe, and gradually increases along the direction from the inlet end to the outlet end, the flow guide refractory mechanism comprises a first section, a second section and a third section which are sequentially connected, the outer diameter of the first section is gradually increased, the outer diameter of the second section is unchanged, the outer diameter of the third section is gradually reduced, the primary air pipe component is sleeved outside the flue gas pipe and together with the flue gas pipe to define a primary air channel for conveying primary air and pulverized coal, a horn mouth is arranged at one end, close to the outlet end, of the primary air pipe component, along the direction from the inlet end to the outlet end, and the inner diameter of the horn mouth is gradually increased, and along the direction from the inlet end to the outlet end, one end, close to the outlet end of the flue gas pipe does not exceed the flow section.

According to the cyclone burner for recycling the ammonia-doped flue gas, the diversion refractory mechanism is arranged on the peripheral wall of one end, close to the outlet end, of the flue gas pipe, the outer diameter line of the diversion refractory mechanism is gradually increased, unchanged, and gradually reduced, so that an annular cavity which is firstly reduced and then straightened and then enlarged is formed in the primary air channel, the part of the primary air channel is formed into an annular Laval-like spray pipe shape, pulverized coal in the primary air is subjected to shade separation when passing through the diversion refractory mechanism, the rigidity of the primary air can be enhanced, and in the direction from the inlet end to the outlet end, one end, close to the outlet end, of the flue gas pipe does not exceed a flowing section, ammonia fuel can be well mixed with flue gas flowing out of the flue gas pipe when flowing out of the flowing out hole, the ammonia fuel is guaranteed to dilute the ammonia fuel, a certain oxygen-deficient environment is obtained when the ammonia fuel is combusted, the oxidation effect of the ammonia fuel is weakened, the reduction effect of the ammonia fuel on NOx generated when the pulverized coal is enhanced, the NOx generation is reduced, the environmental protection in the use process of the cyclone burner is improved, and the operation cost of the cyclone burner is reduced.

In some embodiments of the invention, the ammonia fuel pipe is movable in an axial direction of the flow section, the swirl burner further comprising a drive mechanism provided at an end of the flow section near the inlet end for driving the ammonia fuel pipe to move in the axial direction of the ammonia fuel pipe.

In some embodiments of the invention, the drive mechanism includes a drive motor and a transmission mechanism coupled to both the flow section and an output shaft of the drive motor for driving the ammonia fuel pipe to move in an axial direction of the ammonia fuel pipe.

In some embodiments of the invention, the angle between the peripheral wall of the first section and the axis of the ammonia fuel pipe is A and is 15A 35, and/or the angle between the peripheral wall of the third section and the axis of the ammonia fuel pipe is B and is 15B 35.

In some embodiments of the present invention, the angle between the inner peripheral wall of the bell mouth and the axis of the primary air duct assembly is C and satisfies 15 deg. C≤35 deg. on the section where the axis of the primary air duct assembly is located.

In some embodiments of the invention, the angle between the peripheral wall of the outflow section and the axis of the outflow section is D and satisfies 15 DEG≤D≤35 DEG in the cross section where the axis of the ammonia fuel pipe is located.

In some embodiments of the invention, the axis of the outflow aperture is perpendicular to the peripheral wall of the outflow section.

In some embodiments of the present invention, the flow section includes an inner fuel pipe and an outer casing, the outer casing is sleeved outside the inner fuel pipe, the outer casing is a refractory pipe, and at least part of the outer casing is penetrated in the flue pipe.

In some embodiments of the present invention, the cyclone burner for recycling the ammonia-doped flue gas further comprises a secondary air pipe assembly, wherein the secondary air pipe assembly is sleeved on at least part of the outer side, close to the outlet end, of the primary air pipe assembly and is used for limiting a secondary air channel together with the primary air pipe assembly, so as to convey secondary air.

In some embodiments of the present invention, the secondary air duct assembly includes a first duct and a second duct, the first duct being sleeved on at least a portion of the outer side of the primary air duct assembly near the outlet end, the first duct and the primary air duct assembly defining an inner swirl passage, an inner bellows and inner vanes being sequentially provided on a side of the inner swirl passage near the inlet end in a direction from the inlet end to the outlet end, the second duct being sleeved on at least a portion of the outer side of the first duct near the outlet end, the second duct and the first duct defining an outer swirl passage, and an outer bellows and outer vanes being sequentially provided on a side of the outer swirl passage near the inlet end in a direction from the inlet end to the outlet end.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic illustration of a swirl burner according to an embodiment of the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 1;

fig. 4 is a side view of the outflow section side of the ammonia fuel pipe of the cyclone burner according to the embodiment of the present invention.

Reference numerals:

100. a swirl burner;

1. an ammonia fuel pipe 11, a flow section 111, an internal combustion pipe 112, an outer sleeve 12, an outflow section 121, an outflow hole 13, an inlet end 14, and an outlet end;

2. The flue gas pipe, 21, a flue gas channel, 22, a diversion refractory mechanism, 221, a first section, 222, a second section, 223, a third section, 23, a pipe body, 24 and a flue gas inlet pipe;

3. A primary air duct assembly; 31, a primary air channel, 32, a horn mouth, 33, a primary pipe, 34, a primary air inlet pipe;

4. the driving mechanism, 41, the driving motor, 42, the transmission mechanism;

5. Secondary air duct assembly 51, first duct, 511, inner swirl passage 512, inner windbox 513, inner vane 52, second duct 521, outer swirl passage 522, outer windbox 523, outer vane 53, secondary air passage.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

A cyclone burner 100 for spiked flue gas recirculation according to an embodiment of the present invention is described below with reference to fig. 1-4.

As shown in fig. 1, a cyclone burner 100 for recycling an ammonia-doped flue gas according to an embodiment of the present invention includes an ammonia fuel pipe 1, a flue gas pipe 2, and a primary air pipe assembly 3.

Specifically, as shown in fig. 1, 2 and 4, the ammonia fuel pipe 1 may provide a transport channel for ammonia fuel, the ammonia fuel pipe 1 includes a flow section 11 and an outflow section 12, two axial ends of the flow section 11 are an inlet end 13 and an outlet end 14, respectively, one axial end of the outflow section 12 is connected to the outlet end 14 of the flow section 11, the other axial end is closed, the circumferential wall of the outflow section 12 is inclined toward a direction (a first direction as shown in fig. 1) close to the axis of the outflow section 12 in a direction from the inlet end 13 to the outlet end 14, a plurality of outflow holes 121 are provided on the circumferential wall of the outflow section 12, and the plurality of outflow holes 121 are sequentially provided at intervals along the circumferential direction of the outflow section 12.

It can be appreciated that the outflow section 12 is designed into a circular frustum structure, and the holes 121 are formed on the peripheral wall of the outflow section 12 at intervals in sequence along the circumferential direction of the outflow section 12, so that the uniform distribution of the ammonia fuel at the outlet of the ammonia fuel pipe 1 is promoted, and the combustion efficiency and stability of the ammonia fuel of the cyclone burner 100 are further improved.

As shown in fig. 1 and 2, the flue gas pipe 2 is sleeved outside the ammonia fuel pipe 1 and defines a flue gas channel 21 together with the ammonia fuel pipe 1, and an outlet of the flue gas channel 21 is matched with the outflow section 12 of the circular frustum, so that the flue gas can be directly incident on a position mixed with the ammonia fuel, and the flue gas can sufficiently dilute the ammonia fuel incident from the outflow hole 121.

As shown in fig. 1 and 2, the primary air pipe assembly 3 is sleeved outside the flue gas pipe 2 and defines a primary air channel 31 together with the flue gas pipe 2, and is used for conveying primary air and pulverized coal, a flow guiding refractory mechanism 22 is arranged on the peripheral wall of one end, close to the outlet end 14, of the flue gas pipe 2, the flow guiding refractory mechanism 22 extends into a ring shape along the circumferential direction of the flue gas pipe 2, the flow guiding refractory mechanism 22 comprises a first section 221, a second section 222 and a third section 223 which are sequentially connected, the outer diameter of the first section 221 is gradually increased, the outer diameter of the second section 222 is unchanged, and the outer diameter of the third section 223 is gradually reduced. The primary air channel 31 is formed into an annular cavity which is firstly reduced, then straightened and then enlarged, the primary air pipe assembly 3 and the part of the flue pipe 2 provided with the diversion refractory mechanism 22 are formed into an annular Laval-like spray pipe shape, so that pulverized coal conveyed by primary air can be concentrated at the first section 221, the pulverized coal concentration of the part of the primary air channel 31, which is close to the diversion refractory mechanism 22, is stably flowed through the second section 222, the stability of pulverized coal conveying is improved, the pulverized coal inertia is utilized by post expansion, the wind and the pulverized coal are separated in concentration and dilution, the primary air rigidity is improved, the combustion stability of the cyclone burner 100 is improved under the low-load operation state, the sufficient combustion of the pulverized coal is ensured, and the combustion efficiency is improved.

Meanwhile, as shown in fig. 1 and 2, the inner diameter of the second section 222 is kept constant, so that the material conveying state after concentration is further stabilized, turbulent flow is avoided being formed in the primary air pipe channel, and the stability of pulverized coal material conveying is ensured.

The one end of the primary air pipe assembly 3 near the outlet end 14 is provided with a flare opening 32, the inner diameter of the flare opening 32 gradually increases along the direction from the inlet end 13 to the outlet end 14, primary air near the flare opening 32 can be conveyed to the peripheral area of the flare opening 32, and a high oxygen area is formed at the flare opening 32, so that coal dust can be conveniently and fully combusted in the high oxygen area, and a low oxygen combustion area is formed between one side of the diversion refractory mechanism 22 near the outlet end 14 and ammonia fuel doped with flue gas. The method can ensure the rigidity of primary air, ensure the separation of primary air and pulverized coal, inhibit the oxidation of ammonia fuel, promote the reduction effect of ammonia fuel on NOx generated by pulverized coal combustion, reduce the generation of NOx, promote the environmental protection in the use process of the coal-fired boiler, reduce the running cost of the coal-fired boiler and ensure the efficiency of ammonia-doped combustion.

Wherein the end of the flue gas duct 2 near the outlet end 14 does not exceed the flow section 11 in the direction from the inlet end 13 to the outlet end 14. The ammonia fuel can be well mixed with the flue gas flowing out of the flue gas pipe 2 when flowing out from the outflow hole 121, so that the dilution effect of the flue gas on the ammonia fuel is ensured, a certain oxygen-deficient environment is obtained when the ammonia fuel is combusted, the oxidation effect of the ammonia fuel is weakened, the reduction characteristic of the ammonia fuel is enhanced, and the generation of NOx is reduced.

According to the cyclone burner 100 for recycling the ammonia-doped flue gas, the diversion refractory mechanism 22 is arranged on the peripheral wall of one end, close to the outlet end 14, of the flue gas pipe 2, the outer diameter line of the diversion refractory mechanism 22 is gradually increased, then unchanged, and finally gradually reduced, so that an annular cavity which is firstly reduced and then straightened and then enlarged is formed in the primary air channel 31, the part of the primary air channel 31 is formed into an annular Laval nozzle-like shape, pulverized coal in the primary air is subjected to shade separation when passing through the diversion refractory mechanism 22, the rigidity of the primary air can be enhanced, the end, close to the outlet end 14, of the flue gas pipe 2 does not exceed the flow section 11 along the direction from the inlet end 13 to the outlet end 14, the ammonia fuel can be well mixed with the flue gas flowing out of the flue gas pipe 2 when flowing out from the outflow hole 121, the dilution effect of the ammonia fuel on the ammonia fuel is ensured, a certain oxygen-deficient environment is obtained when the ammonia fuel is combusted, the oxidation effect of the ammonia fuel is weakened, the reduction effect of the ammonia fuel on NOx generated when the pulverized coal combustion is enhanced, the NOx generation is reduced, the environmental protection performance of the cyclone burner 100 is improved, the operation cost of the cyclone burner 100 is reduced, and the operation cost of the cyclone burner is reduced.

In this embodiment, the diversion refractory 22 is a refractory material, which can strengthen the refractory performance of the primary air near the outlet end 14, and enhance the stability and safety of the combustion of the ammonia fuel.

In some embodiments of the present invention, as shown in fig. 1 and 3, the ammonia fuel pipe 1 is movable in the axial direction of the flow section 11, and the swirl burner 100 further comprises a driving mechanism 4, the driving mechanism 4 being provided at an end of the flow section 11 near the inlet end 13 for driving the ammonia fuel pipe 1 to move in the axial direction of the ammonia fuel pipe 1. The driving mechanism 4 can push or pull the ammonia fuel pipe 1 along the axial direction of the flow section 11, so that the specific positions of the outflow section 12 of the ammonia fuel pipe 1 relative to the outlet of the flue pipe 2, which is close to the outlet end 14, and the flare 32 of the primary air pipe assembly 3 are changed, the ammonia mixing combustion under different combustion conditions can be met, the adaptability and the application range of the cyclone burner 100 are improved, the flexibility of the cyclone burner 100 in terms of fuel mixing and combustion control is greatly improved, the ammonia mixing combustion uniformity of the cyclone burner 100 under different combustion loads is ensured, the reliability and the stability of the ammonia mixing combustion of the cyclone burner 100 are improved, and the possibility of adjusting the combustion parameters according to actual requirements is provided for users.

Further, as shown in fig. 1 and 3, the driving mechanism 4 includes a driving motor 41 and a transmission mechanism 42, and the transmission mechanism 42 is connected with the flow section 11 and an output shaft of the driving motor 41, and is used for driving the ammonia fuel pipe 1 to move along the axial direction of the ammonia fuel pipe 1, so that the ammonia fuel pipe 1 can be stably and reliably driven to move along the axial direction of the ammonia fuel pipe 1, and the driving mechanism 4 can realize accurate control of the position of the ammonia fuel pipe 1 through a precise mechanical driving technology.

For example, the transmission mechanism 42 is a rack-and-pinion mechanism, in which a pinion is connected to an output shaft of the drive motor 41 and rotates in synchronization, the pinion is engaged with a rack, the rack is connected to the ammonia fuel pipe 1, and the rack is movable in the axial direction of the ammonia fuel pipe 1, so that the ammonia fuel pipe 1 is movable in the axial direction of the ammonia fuel pipe 1.

Or, the driving motor 41 is a stepping motor, and the output shaft of the stepping motor can move along the axial direction of the ammonia fuel pipe 1, and the output shaft of the stepping motor is connected with the ammonia fuel pipe 1, so that the ammonia fuel pipe 1 moves along the axial direction of the ammonia fuel pipe 1.

In this embodiment, the adjustment mode of the ammonia fuel pipe 1 is set to be driven by the driving motor 41, that is, the bearing gear mechanism on the ammonia fuel pipe 1 is connected with the chain of the driving motor 41, and the combination setting of the driving motor 41 is adjusted in cooperation, so that the ammonia fuel pipe 1 can realize the axial displacement of the ammonia fuel pipe 1 and the end part at the same time, and further, the distance that the outflow section 12 of the ammonia fuel pipe 1 extends out of the outlet (the outlet of the flue gas pipe 2/primary air pipe assembly 3) of the cyclone burner 100 is changed, so as to realize the change of the ammonia fuel spraying position.

In some embodiments of the present invention, as shown in FIGS. 1 and 2, the angle A between the outer peripheral wall of the first segment 221 and the axis of the ammonia fuel pipe 1 in the section where the axis of the flue gas pipe 2 is located is 15A 35. It is understood that the angle a between the outer circumferential wall of the first section 221 and the axis of the ammonia fuel pipe 1 may be 15 °, 16 °, 17 °, 18 °, 19 °,20 °, 21 °, 22 °, 23 °, 24 °, 25 °, 26 °, 27 °, 28 °, 29 °,30 °,31 °,32 °, 33 °, 34 °, or 35 °. The included angle A between the outer peripheral wall of the first section 221 and the axis of the ammonia fuel pipe 1 is not smaller than 15 degrees, so that the shrinking effect of the primary air channel 31 and the concentration effect of pulverized coal airflow can be ensured, the included angle A between the outer peripheral wall of the first section 221 and the axis of the ammonia fuel pipe 1 is not larger than 35 degrees, the primary air channel 31 is prevented from being too small, pulverized coal is prevented from being blocked at one side of the first section 221 close to the inlet end 13, and the effect of the primary air channel 31 in conveying primary air and pulverized coal is ensured.

In some embodiments of the present invention, as shown in FIGS. 1 and 2, the angle between the outer peripheral wall of the third section 223 and the axis of the ammonia fuel pipe 1 is B and satisfies that 15≤B≤35 in the section where the axis of the flue gas pipe 2 is located. It is understood that the angle B between the outer circumferential wall of the third section 223 and the axis of the ammonia fuel pipe 1 may be 15 °, 16 °, 17 °, 18 °, 19 °,20 °, 21 °, 22 °, 23 °, 24 °, 25 °, 26 °, 27 °, 28 °, 29 °,30 °, 31 °, 32 °,33 °, 34 °, or 35 °. The included angle B between the outer peripheral wall of the third section 223 and the axis of the ammonia fuel pipe 1 is not smaller than 15 degrees, so that the concentration and dilution separation of the coal powder in the primary air can be ensured when the coal powder passes through the diversion refractory mechanism 22, and the included angle B between the outer peripheral wall of the third section 223 and the axis of the ammonia fuel pipe 1 is not larger than 35 degrees, so that the effect of conveying the primary air and the coal powder in the primary air channel 31 can be ensured.

In some embodiments of the present invention, as shown in FIGS. 1 and 2, the angle between the inner peripheral wall of the bell mouth 32 and the axis of the primary air pipe assembly 3 is C and satisfies 15C 35 in the section where the axis of the primary air pipe assembly 3 is located. It will be appreciated that the angle C between the inner peripheral wall of the flare 32 and the axis of the primary air conduit assembly 3 may be 15 °, 16 °, 17 °, 18 °, 19 °,20 °, 21 °, 22 °, 23 °,24 °, 25 °, 26 °,27 °, 28 °, 29 °,30 °, 31 °, 32 °, 33 °,34 ° or 35 °. The included angle C between the inner peripheral wall of the horn mouth 32 and the axis of the primary air pipe assembly 3 is not smaller than 15 degrees, the outward flow guiding effect of the horn mouth 32 on primary air can be ensured, a high oxygen area is formed at the horn mouth 32, a low oxygen combustion area is formed between one side of the flow guiding refractory mechanism 22, which is close to the outlet end 14, and ammonia fuel doped with smoke, and the included angle C between the inner peripheral wall of the horn mouth 32 and the axis of the primary air pipe assembly 3 is not larger than 35 degrees, so that the oxygen content at the inner side of the horn mouth 32 is prevented from being too low, and the influence on the combustion effect of the ammonia fuel is avoided.

In some embodiments of the present invention, as shown in FIGS. 1 and 2, in a section where the axis of the ammonia fuel pipe 1 is located, the angle between the peripheral wall of the outflow section 12 and the axis of the outflow section 12 is D and satisfies that 15≤D≤35. It will be appreciated that the angle D between the peripheral wall of the outflow section 12 and the axis of the outflow section 12 may be 15 °, 16 °, 17 °, 18 °, 19 °, 20 °, 21 °, 22 °, 23 °, 24 °, 25 °,26 °, 27 °, 28 °,29 °, 30 °, 31 °, 32 °, 33 °, 34 °, or 35 °. The included angle D between the peripheral wall of the outflow section 12 and the axis of the outflow section 12 is not smaller than 15 degrees, so that excessive flow of ammonia fuel to the radial outer side of the ammonia fuel pipe 1 can be avoided, mixing of the ammonia fuel and primary air at the horn mouth 32 is avoided, high oxygen content during combustion of the ammonia fuel is avoided, more NOx is avoided, the included angle D between the peripheral wall of the outflow section 12 and the axis of the outflow section 12 is not larger than 35 degrees, excessive concentration of the ammonia fuel is avoided, and the mixing effect of the ammonia fuel and smoke is avoided.

In some embodiments of the present invention, as shown in fig. 1 and 2, the axis of the outflow hole 121 is perpendicular to the peripheral wall of the outflow section 12, so that the outflow hole 121 is configured into a hole structure with a certain incident angle, and the combination of the flare 32 and the flow-guiding refractory mechanism 22 of the flue gas pipe 2 is matched, so that the middle part at the outlet of the cyclone burner 100 forms a mixed oxygen-deficient area doped with ammonia and flue gas, and the periphery forms an oxygen-enriched area, thereby effectively avoiding the ammonia fuel from being involved into the oxygen-enriched area of pulverized coal combustion during the ammonia-doped combustion, inhibiting the oxidation of the ammonia fuel, promoting the reduction effect of the ammonia fuel on NOx generated by the pulverized coal combustion, reducing the generation of NOx, and ensuring the efficiency of the ammonia-doped combustion.

In some embodiments of the present invention, as shown in fig. 1, the flue gas pipe 2 includes a pipe body 23 and a flue gas inlet pipe 24, the pipe body 23 is sleeved on the radial outer side of the ammonia fuel pipe 1 and at least partially penetrates into the primary air pipe assembly 3, the flue gas inlet pipe 24 is communicated with one end of the pipe body 23 near the inlet end 13 and extends outwards along the radial direction of the pipe body 23, so that the inlet of the flue gas entering the flue gas pipe 2 is separated from the inlet of the ammonia fuel entering the ammonia fuel pipe 1, the ammonia fuel is prevented from being mixed with the flue gas in advance, and the combustion effect of the ammonia fuel is prevented from being affected.

In some embodiments of the present invention, as shown in fig. 1, the primary air pipe assembly 3 includes a primary pipe 33 and a primary air inlet pipe 34, the primary pipe 33 is sleeved on the radial outer side of the flue gas pipe 2, the primary air inlet pipe 34 is communicated with one end of the primary pipe 33 near the inlet end 13 and extends outwards along the radial direction of the primary air inlet pipe 34, so that the inlet of primary air and pulverized coal into the primary air pipe assembly 3 is separated from the inlet of flue gas into the flue gas pipe 2 and the inlet of ammonia fuel into the ammonia fuel pipe 1, thereby avoiding the advanced mixing of ammonia fuel with flue gas and the mixing of primary air and pulverized coal with ammonia fuel and flue gas, and avoiding the influence on the combustion effect of the ammonia fuel and pulverized coal.

In some embodiments of the present invention, as shown in fig. 1, 3 and 4, the flow section 11 includes an inner fuel pipe 111 and an outer casing 112, the outer casing 112 is sleeved outside the inner fuel pipe 111, the outer casing 112 is a refractory pipe, and at least part of the outer casing 112 is penetrated in the flue pipe 2. The outer sleeve 112 is in sealing connection with the flue gas inlet pipe 24, so that the tightness and reliability of the ammonia fuel conveying process are fully ensured, and leakage in the ammonia fuel conveying process is avoided. And the outer sleeve 112 is relatively refractory to avoid damage to the ammonia fuel pipe 1 during combustion of the ammonia fuel. The outer sleeve 112 of refractory material may be used to insulate the heat of the flue gas from being transferred to the ammonia fuel inside the inner fuel tube 111, enhancing the stability and safety of the combustion of the ammonia fuel.

In some embodiments of the present invention, as shown in fig. 1, the cyclone burner 100 for recycling the ammonia-doped flue gas further includes a secondary air pipe assembly 5, wherein the secondary air pipe assembly 5 is sleeved on at least a part of the outer side of the primary air pipe assembly 3 near the outlet end 14 and defines a secondary air channel 53 together with the primary air pipe assembly 3 for conveying secondary air. An oxygen-enriched area with a certain length can be formed in the peripheral area of the outlet end 14 of the primary air pipe assembly 3, so that the concentrated pulverized coal in the primary air pipe assembly 3 can realize oxygen-enriched combustion in the peripheral area of the horn mouth 32, and the stability of the flame root of the pulverized coal is fully ensured.

In some embodiments of the present invention, as shown in fig. 1, the secondary air duct assembly 5 includes a first duct 51 and a second duct 52. The first pipe 51 is sleeved on at least part of the outer side of the primary air pipe assembly 3, which is close to the outlet end 14, the first pipe 51 and the primary air pipe assembly 3 define an inner rotational flow channel 511, an inner air box 512 and an inner blade 513 are sequentially arranged on one side, close to the inlet end 13, of the inner rotational flow channel 511 along the direction from the inlet end 13 to the outlet end 14, the inner air box 512 generates wind, the inner blade 513 converts the wind generated by the inner air box 512 into rotational flow and continuously conveys inner rotational flow secondary wind to the peripheral area of the bell mouth 32, the second pipe 52 is sleeved on at least part of the outer side, close to the outlet end 14, of the first pipe 51, the second pipe 52 and the first pipe 51 define an outer rotational flow channel 521, an outer air box 522 and an outer blade 523 are sequentially arranged on one side, close to the inlet end 13, of the outer air box 522 generates wind, and the outer blade 523 converts the wind generated by the outer air box 522 into rotational flow and continuously conveys outer rotational flow secondary wind to the peripheral area of the bell mouth 32. So that the concentrated pulverized coal in the primary air pipe assembly 3 can realize oxygen-enriched combustion in the peripheral area of the horn mouth 32, and the stability of the flame root of the pulverized coal is fully ensured.

Correspondingly, the outflow section 12 of the ammonia fuel pipe 1 and the diversion refractory mechanism 22 of the flue gas pipe 2 are matched, one end, close to the outlet end 14, of the flue gas pipe 2 does not exceed the flow section 11 along the direction from the inlet end 13 to the outlet end 14, and the horn mouth 32 of the primary air pipe assembly 3 are arranged in a combined mode, so that ammonia fuel can be accurately fed into the cyclone burner 100 after being diluted by flue gas, an oxygen-enriched area at the periphery of the outlet end 14 far away from the cyclone burner 100 is avoided, the ammonia fuel is prevented from being sucked to one side, close to the outlet end 14, of the secondary air pipe assembly 5 of the cyclone burner 100, and therefore oxidation reaction of ammonia is effectively inhibited, pyrolysis of ammonia is promoted, combustion efficiency of the ammonia is ensured, and meanwhile generation of NOx is controlled.

In this embodiment, the ends of the first tube 51 and the second tube 52 near the outlet end 14 are in a horn shape, so as to be matched with the horn mouth 32 of the first air tube assembly, thereby realizing the matching of the secondary air and the pulverized coal combustion area.

Other configurations and operations of the cyclone burner 100 for ammonia-doped flue gas recirculation according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although 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 alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.

Claims (10)

1. A cyclone burner for recycling of spiked flue gas, comprising:

The ammonia fuel pipe comprises a flow section and an outflow section, wherein the two axial ends of the flow section are respectively an inlet end and an outlet end, one axial end of the outflow section is connected with the outlet end of the flow section, the other axial end of the outflow section is closed, the circumferential wall of the outflow section inclines towards the direction close to the axis of the outflow section along the direction from the inlet end to the outlet end, a plurality of outflow holes are formed in the circumferential wall of the outflow section, and the plurality of outflow holes are sequentially arranged at intervals along the circumferential direction of the outflow section;

The flue gas pipe is sleeved outside the ammonia fuel pipe and together defines a flue gas channel with the ammonia fuel pipe, a flow guiding refractory mechanism is arranged on the peripheral wall of one end of the flue gas pipe, which is close to the outlet end, the flow guiding refractory mechanism extends into a ring shape along the circumferential direction of the flue gas pipe, the flow guiding refractory mechanism comprises a first section, a second section and a third section which are sequentially connected along the direction from the inlet end to the outlet end, the outer diameter of the first section is gradually increased, the outer diameter of the second section is unchanged, and the outer diameter of the third section is gradually reduced;

The primary air pipe assembly is sleeved outside the flue gas pipe and is used for limiting a primary air channel together with the flue gas pipe and conveying primary air and pulverized coal, one end, close to the outlet end, of the primary air pipe assembly is provided with a horn mouth, and the inner diameter of the horn mouth is gradually increased along the direction from the inlet end to the outlet end;

wherein, along the direction from the inlet end to the outlet end, one end of the flue gas pipe which is close to the outlet end does not exceed the flow section.

2. The cyclone burner of claim 1 wherein the ammonia fuel pipe is movable in an axial direction of the flow section, the cyclone burner further comprising:

and the driving mechanism is arranged at one end of the flow section, which is close to the inlet end, and is used for driving the ammonia fuel pipe to move along the axial direction of the ammonia fuel pipe.

3. The cyclone burner for recycling ammonia-doped flue gas according to claim 2, characterized in that the driving mechanism comprises:

A driving motor;

And the transmission mechanism is connected with the flow section and an output shaft of the driving motor and is used for driving the ammonia fuel pipe to move along the axial direction of the ammonia fuel pipe.

4. The cyclone burner for recycling ammonia-doped flue gas according to claim 1, wherein the included angle between the peripheral wall of the first section and the axis of the ammonia fuel pipe is A and is 15 degrees less than or equal to A less than or equal to 35 degrees on the section where the axis of the flue gas pipe is located;

And/or, on the section where the axis of the flue pipe is located, the included angle between the peripheral wall of the third section and the axis of the ammonia fuel pipe is B and is 15 degrees or more and less than or equal to 35 degrees or less.

5. The cyclone burner of claim 1, wherein the angle between the inner peripheral wall of the bell mouth and the axis of the primary air duct assembly is C and is 15 DEG C35 DEG.

6. The cyclone burner of claim 1, wherein the angle between the peripheral wall of the outflow section and the axis of the outflow section is D and is 15 DEG-D-35 DEG inclusive.

7. The cyclone burner of claim 1 wherein the axis of the outflow holes is perpendicular to the peripheral wall of the outflow section.

8. The cyclone burner for recycling ammonia-doped flue gas according to claim 1, characterized in that the flow section comprises:

An internal combustion feed pipe;

The outer sleeve is sleeved on the outer side of the internal combustion pipe, the outer sleeve is a fire-resistant pipe, and at least part of the outer sleeve penetrates through the flue.

9. The cyclone burner for recycling ammonia-doped flue gas according to claim 1, characterized by further comprising:

The secondary air pipe assembly is sleeved on at least part of the outer side, close to the outlet end, of the primary air pipe assembly and is used for limiting a secondary air channel together with the primary air pipe assembly and conveying secondary air.

10. The cyclone burner of claim 9 wherein the secondary air duct assembly comprises:

The first pipe is sleeved on at least part of the outer side of the primary air pipe assembly, which is close to the outlet end, and the first pipe and the primary air pipe assembly define an inner cyclone channel, and an inner bellows and an inner blade are sequentially arranged on one side, close to the inlet end, of the inner cyclone channel along the direction from the inlet end to the outlet end;

The second pipe is sleeved on at least part of the outer side of the first pipe, which is close to the outlet end, the second pipe and the first pipe define an outer cyclone channel, and an outer bellows and an outer blade are sequentially arranged on one side of the outer cyclone channel, which is close to the inlet end, along the direction from the inlet end to the outlet end.