CN216868505U - Burner for waste gas incineration - Google Patents

Abstract

The utility model discloses a burner for waste gas incineration. The burner includes a windbox, a flame tube, a plurality of exhaust gas nozzles, a plurality of gas nozzles, and an ignition gun. The wind box is used for introducing air required by combustion; the flame tube is positioned at the downstream of the air box and is in gas communication with the air box along the axial direction; a plurality of exhaust gas nozzles are arranged in the flame tube; the plurality of gas nozzles are arranged in the flame tube; the firing end of the firing gun is disposed within the liner, wherein the plurality of exhaust gas nozzles are spaced apart from the plurality of gas nozzles. According to the utility model, the waste gas nozzle and the gas nozzle are arranged at intervals, so that heat generated by combustion can be relatively uniformly distributed in the flame tube, local high heat is avoided, and the generation of nitrogen oxides can be effectively controlled.

Description

Burner for waste gas incineration

Technical Field

The utility model relates to the field of combustors, in particular to a combustor for waste gas incineration.

Background

The direct combustion incinerator is a device for treating wastes by adopting a direct combustion method, and the wastes are thoroughly incinerated, oxidized and decomposed by utilizing the high temperature generated by combustion-supporting fuel so as to achieve the aim of clean discharge. With the continuous improvement of the national environmental protection requirement, the toxic and harmful waste gas generated in the chemical production process is burnt by a direct-fired incinerator, which is the most effective waste gas disposal mode. For example, in the production process of EO/EG, a large amount of volatile organic compounds are generated, a set of direct-fired waste gas incinerator is required to be configured, and waste gas generated in the production process is incinerated, so that smoke generated after incineration reaches the national emission standard. The design of the combustion device of the incinerator is a key technology in the incineration process due to the complex components of waste gas, large flow and low heat value. The utility model provides a low-nitrogen burner for burning large-flow low-heat-value waste gas, which can adopt different nozzle combination designs according to different pressures, heat values and flows of the waste gas to meet the requirements of high-flow waste gas low-nitrogen burning treatment.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.

To at least partially solve the above problems, the present invention provides a burner for incineration of exhaust gas, comprising:

a windbox for introducing air required for combustion;

a flame tube located downstream of the windbox and in gaseous communication with the windbox in an axial direction;

a plurality of exhaust gas nozzles disposed in the flame tube;

a plurality of gas nozzles disposed in the flame tube; and

the ignition end of the ignition gun is arranged in the flame tube,

wherein the plurality of exhaust gas nozzles are spaced apart from the plurality of gas nozzles.

According to the present invention, the burner for waste gas incineration ignites the gas nozzle through the burning torch to cause the gas nozzle to release flame, and then ignites the waste gas through the flame released from the gas nozzle to burn harmful substances in the waste gas, thereby causing the waste gas to reach the emission standard. The waste gas nozzle and the gas nozzle are arranged at intervals, so that the waste gas is in full contact with flame (namely high-temperature flue gas) generated by combustion of the high-heat value gas, the waste gas is fully combusted, heat generated by combustion can be uniformly distributed in the flame tube as far as possible, local high heat (for example, the temperature of the heat exceeds 1400 ℃) is reduced, and the generation of nitrogen oxides can be greatly reduced.

Optionally, the flame tube is configured as a cylinder, and the plurality of exhaust gas nozzles and the plurality of gas nozzles are arranged at intervals in a radial direction of the flame tube.

According to the utility model, the exhaust gas nozzle and the gas nozzle are distributed in a ring shape and are spaced apart from each other in the radial direction.

Optionally, the gas nozzle is closer to the axis of the liner than the exhaust nozzle.

According to the utility model, the gas nozzle is inside the exhaust gas nozzle.

Optionally, in a projection plane of the burner along the axial direction of the flame tube, the plurality of gas nozzles are arranged on M circumferences with the center of circle of the flame tube in the projection plane as the center of circle, M circles of the gas nozzles are arranged at intervals with M circles of the exhaust gas nozzles, where M is a natural number greater than or equal to 2.

According to the utility model, the number of turns of the gas nozzle and the number of turns of the exhaust gas nozzle are the same and are respectively not less than 2 turns.

Optionally, M ═ 3.

According to the utility model, the gas nozzle and the exhaust gas nozzle can be constructed with 3 rings each.

Optionally, the number of the exhaust gas nozzles of the kth circle is greater than the number of the gas nozzles of the kth circle, where K is a natural number less than or equal to M, where the circle located at the radially innermost side is the 1 st circle, and the circle located at the radially outermost side is the mth circle.

According to the utility model, the number of exhaust nozzles is greater than the number of gas nozzles.

Optionally, the number of exhaust gas nozzles of the kth ring is 2 times the number of gas nozzles of the kth ring.

According to the utility model, the number of exhaust nozzles is 2 times the number of gas nozzles.

Optionally, the exhaust gas nozzle projects further downstream than the gas nozzle, and/or

The gas nozzle located at the outer ring is projected more downstream than the gas nozzle located at the inner ring, and either

The exhaust nozzle located at the outer ring is projected more downstream than the exhaust nozzle located at the inner ring.

According to the present invention, the gas nozzles and the exhaust gas nozzles that are closer to the outer periphery in the radial direction of the liner are more projected toward the downstream, which facilitates the formation of a continuous combustion flame.

Optionally, the flame tube is configured as a cylinder, and in a projection plane of the burner along an axial direction of the flame tube, the plurality of exhaust gas nozzles and the plurality of gas nozzles are arranged on a plurality of circumferences with a center of a circle of the flame tube in the projection plane as a center of a circle, wherein on the same circumference, the exhaust gas nozzles and the gas nozzles are arranged at intervals.

According to the utility model, the gas nozzles and the exhaust gas nozzles can be distributed at intervals on the same circumference.

Optionally, the plurality of exhaust gas nozzles and the plurality of gas nozzles are evenly distributed over the circumference.

According to the utility model, the gas nozzles and the exhaust gas nozzles are distributed uniformly.

Optionally, the burner for waste gas incineration further comprises:

a preset pipe, at least a part of which extends in an axial direction of the flame tube and is disposed at a center of the flame tube; and

and the at least one swirler is sleeved on the preset pipe.

According to the utility model, at least a part of the preset pipe penetrates through the center of the flame tube in the axial direction and can be used for supporting the swirler, and the swirler plays a role in stabilizing flame.

Optionally, the burner for waste gas incineration further comprises at least one flame stabilizing disc fixed to the waste gas nozzle, the flame stabilizing disc being located outside the swirler in a radial direction of the flame tube.

According to the present invention, the exhaust gas pipe is stronger than the gas pipe, so that the flame stabilizing disk is fixed to the exhaust gas pipe. Meanwhile, the flame stabilizing disc can keep stable combustion in the flame tube according to the structural characteristics of the flame stabilizing disc.

Optionally, the combustor for waste gas incineration further includes M gas inlets for introducing gas required for combustion, wherein the nth gas inlet is connected to all of the gas nozzles of the nth ring, the gas inlets are provided with valves, and N is a natural number less than or equal to M.

According to the utility model, each circle of the M circles of gas nozzles is independently controlled to be opened or closed, so that the gas inflow of the gas can be adjusted by the burner, the proper combustion temperature is realized, and the generation of excessive nitrogen oxides is avoided as much as possible.

Optionally, in a projection plane of the burner in an axial direction of the flame tube, the gas nozzle closest to a firing end of the ignition gun is located on the 1 st circumference, wherein the circumference located on the radially innermost side is the 1 st circumference.

According to the utility model, the ignition end of the ignition gun is as close as possible to the central ring gas nozzle, so as to facilitate the ignition of the gas from inside to outside.

Optionally, in a projection plane of the burner in an axial direction of the flame tube, a firing end of the ignition gun is disposed on the 1 st circumference, and/or

The distance between the center of the ignition end of the ignition gun and the center of the gas nozzle closest to the ignition end of the ignition gun is not more than 200 mm.

According to the utility model, the ignition end is close to the central ring gas nozzle by arranging the ignition end to be the same as the circumference of the central ring gas nozzle and/or limiting the distance between the ignition end and the central ring gas nozzle, so that combustion is diffused from inside to outside.

Optionally, the burner for waste gas incineration further comprises:

a furnace connected to the flame tube downstream of the flame tube; and

and the temperature sensor is arranged in the hearth and used for sensing the temperature in the hearth.

According to the utility model, if the temperature in the hearth is too low, the waste gas can not be fully combusted; on the contrary, if the temperature in the furnace is too high, nitrogen oxides are generated, the temperature is detected, the temperature in the furnace is always suitable for the combustion of the waste gas, and the generation of the nitrogen oxides is controlled as much as possible.

Optionally, the burner for waste gas incineration further comprises an oxygen concentration sensor, which is arranged downstream of the furnace, for sensing the oxygen concentration in the flue gas after combustion.

According to the utility model, when the oxygen concentration in the flue gas after combustion is lower than a certain value (for example 3%), air needs to be supplemented into the hearth to supplement oxygen so as to ensure that the waste gas is fully combusted.

Drawings

The following drawings of the utility model are included to provide a further understanding of the utility model. The drawings illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the utility model.

In the drawings:

fig. 1 is a perspective view of a burner for incineration of exhaust gas according to a preferred embodiment of the present invention;

fig. 2 is a schematic view of a projection plane of an axial direction of a flame tube of a burner for exhaust gas incineration according to a preferred embodiment of the present invention;

fig. 3 is a sectional view of a burner for incineration of exhaust gas according to a preferred embodiment of the present invention.

Description of reference numerals:

10: air box

11: air inlet

12: burner spray gun mounting panel

20: flame tube

30: waste gas spray gun assembly

31: waste gas collecting pipe

32: waste gas inlet

34: exhaust gas inlet pipe

34 a: central layer waste gas inlet pipe

34 b: middle ring layer waste gas inlet pipe

34 c: outer ring layer waste gas inlet pipe

35: exhaust gas nozzle

35 a: center layer exhaust nozzle

35 b: middle ring layer waste gas nozzle

35 c: outer ring layer exhaust nozzle

40: gas spray gun assembly

41: gas inlet

41 a: central layer gas inlet

41 b: middle ring layer gas inlet

41 c: outer ring layer gas inlet

44: gas inlet pipe

44 a: central layer gas inlet pipe

44 b: middle ring layer gas inlet pipe

44 c: outer ring layer gas inlet pipe

45: gas nozzle

45 a: central layer gas nozzle

45 b: middle ring layer gas nozzle

45 c: outer ring layer gas nozzle

50: ignition gun

51: ignition end

60: flame stabilizing assembly

61: cyclone separator

62: flame stabilizing disc

62 a: middle ring layer flame stabilizing disc

62 b: outer ring layer flame stabilizing disc

71: preset pipe

100: burner apparatus

O: center of circle

L: axial line

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.

In the following description, a detailed description will be given in order to thoroughly understand the present invention. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art. It is apparent that the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the utility model, however, the utility model is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

It is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for purposes of illustration only and are not limiting.

Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings.

The present invention provides a burner 100 for waste gas incineration.

As shown in fig. 1 to 3, in the preferred embodiment, the burner 100 includes a windbox 10, a liner, a waste gas torch assembly 30, a gas torch assembly 40, and an ignition gun 50. Preferably, the windbox 10 and the liner are of cylindrical configuration, for example they may be arranged centrally, having a common central axis L. The liner is located downstream of the windbox 10 and is in gas communication with the windbox 10 in the axial direction. The wind box 10 is provided with an air inlet 11 for introducing air. The exhaust gas lance assembly 30 includes a plurality of exhaust gas nozzles 35, the plurality of exhaust gas nozzles 35 being disposed in the combustor basket 20 for introducing exhaust gas. The gas lance assembly 40 includes a plurality of gas nozzles 45, and the plurality of gas nozzles 45 are provided in the liner 20 for introducing gas. The ignition gun 50 is used for ignition, thereby burning exhaust gas.

To avoid the generation of Nitrogen Oxides (NOX) from localized high heat (e.g., above 1400 ℃) during combustion, in a preferred embodiment, a plurality of exhaust nozzles 35 are spaced apart from a plurality of gas nozzles 45.

For example, the plurality of exhaust gas nozzles 35 and the plurality of gas nozzles 45 are provided at intervals in the radial direction of the combustor basket 20. As shown in fig. 2, in a projection plane of the burner 100 in the axial direction of the combustor basket 20, a plurality of gas nozzles 45 are provided on M circumferences centered on the center O of the combustor basket 20 in the projection plane. The exhaust gas nozzles 35 are arranged on M circles around the center O of the combustor basket 20 on the projection plane. M circles of gas nozzles 45 and M circles of exhaust gas nozzles 35 are arranged at intervals, wherein M is a natural number greater than or equal to 2.

Specifically, in the embodiment shown in fig. 2, M is 3. That is, in a projection plane of the burner 100 in the axial direction of the combustor basket 20, the plurality of gas nozzles 45 are provided on 3 circumferences centered on the center O of the combustor basket 20 in the projection plane, forming a center layer gas nozzle 45a, an intermediate ring layer gas nozzle 45b, and an outer ring layer gas nozzle 45 c. The exhaust gas nozzles 35 are arranged on 3 circumferences centered on the center O of the combustor basket 20 on the projection plane, and form a center layer exhaust gas nozzle 35a, an intermediate ring layer exhaust gas nozzle 35b, and an outer ring layer exhaust gas nozzle 35 c. The central layer gas nozzle 45a, the central layer exhaust gas nozzle 35a, the middle ring layer gas nozzle 45b, the middle ring layer exhaust gas nozzle 35b, the outer ring layer gas nozzle 45c and the outer ring layer exhaust gas nozzle 35c are sequentially arranged from inside to outside along the radial direction of the flame tube 20, that is, the 3 rings of gas nozzles 45 and the 3 rings of exhaust gas nozzles 35 are arranged at intervals along the radial direction of the flame tube. Preferably, the gas nozzle 45 is closer to the axis L of the liner 20 than the exhaust gas nozzle 35, i.e., the gas nozzle 45 is located relatively at the inner circle and the exhaust gas nozzle 35 is located relatively at the outer circle. Preferably, the plurality of exhaust gas nozzles 35 and the plurality of gas nozzles 45 are evenly distributed over the circumference.

In the present invention, M may be set to a natural number such as 2, 4, 5, or the like.

Generally, the number of exhaust nozzles 35 is greater than the number of gas nozzles 45. For example, it may be achieved by setting the number of the exhaust gas nozzles 35 of the K-th turn to be greater than the number of the gas nozzles 45 of the K-th turn. And K is a natural number less than or equal to M, wherein the circle positioned at the innermost side in the radial direction is the 1 st circle, and the circle positioned at the outermost side in the radial direction is the Mth circle. Preferably, the number of the exhaust gas nozzles 35 of the K-th turn is set to 2 times the number of the gas nozzles 45 of the K-th turn.

It is understood that the center layer is turn 1, the middle layer is turn 2, and the outer layer is turn 3. That is, as K increases, the radius of the circumference increases, being relatively further away from the center O of the liner 20.

In the preferred embodiment, the exhaust gas lance assembly 30 further comprises an exhaust gas header 31 and an exhaust gas inlet pipe 34. An exhaust gas manifold 31 is provided on the burner lance mounting panel 12, with an exhaust gas inlet 32 provided at one end and an exhaust gas inlet pipe 34 connected at the other end, the exhaust gas inlet pipe 34 being further connected to an exhaust gas nozzle 35. The exhaust gas inlet pipe 34 is also distributed in a plurality of circles (M circles, for example, 3 circles) corresponding to the plurality of exhaust gas nozzles 35, and includes, for example, a center layer exhaust gas inlet pipe 34a, a middle layer exhaust gas inlet pipe 34b, and an outer layer exhaust gas inlet pipe 34 c. Preferably, a plurality of exhaust gas inlet pipes 34 extend in the windbox 10 in a direction parallel to the axis L of the liner 20.

The gas lance assembly 40 also includes a gas inlet 41 and a gas inlet pipe 44. The burner 100 includes M gas inlets 41 and M gas inlets 44 corresponding to the M gas nozzles 45. The nth gas inlet is connected to the nth gas inlet pipe 44, the nth gas inlet pipe 44 is connected to the nth gas nozzle 45, that is, the nth gas inlet is connected to all the nth gas nozzles 45(N is a natural number less than or equal to M). And each gas inlet is provided with a valve, so that each circle of gas inlet parts can independently feed gas. In a preferred embodiment, M ═ 3. The gas inlet 41 includes a center layer gas inlet 41a, a middle rim layer gas inlet 41b, and an outer rim layer gas inlet 41c provided on the burner lance mounting panel 12. The gas inlet pipe 44 includes a center layer gas inlet pipe 44a, a middle ring layer gas inlet pipe 44b, and an outer ring layer gas inlet pipe 44 c. The center tier gas inlet duct 44a connects the center tier gas inlet and all of the center tier gas nozzles 45 a. The middle ring layer gas inlet pipe 44b is connected with the middle ring layer gas inlet and all the middle ring layer gas nozzles 45 b. The outer ring layer gas inlet pipe 44c is connected to the outer ring layer gas inlet port and the entire outer ring layer gas nozzle 45 c. Preferably, a plurality of gas inlet pipes 44 extend in the windbox 10 in a direction parallel to the axis L of the liner 20.

Preferably, the firing end 51 of the firing gun 50 is located close to the center tier gas burner 45a, i.e., the gas burner 45 closest to the firing end 51 of the firing gun 50 is located on the 1 st circumference (i.e., the 1 st turn). For example, in a projection plane of the burner 100 in the axial direction of the liner 20, the distance between the firing end 51 of the ignition gun 50 and the center O of the liner 20 is substantially equal to the distance between the center layer gas nozzle 45a and the point O, that is, the firing end 51 is disposed on the 1 st circumference. It is also possible to define the distance of the firing tip 51 from the closest gas burner 45 in the center tier, for example, the distance of the center of the firing tip 51 from the center of the closest gas burner 45 to the firing tip 51 is set to not more than 200 mm.

To ensure combustion stability, the burner 100 preferably further includes a flame holding assembly 60. The flame holding assembly 60 includes at least one swirler 61 and at least one flame holding disk 62. The swirler 61 is relatively located at the center of the flame tube 20, and is sleeved on a preset pipe 71 fixed at the center of the flame tube 20 (the preset pipe 71 is a reserved component of the burner 100, and is used for, for example, providing an observation hole, additionally providing a gas spray gun, and the like, and at least a part of the preset pipe 71 extends along the axial direction of the flame tube 20 and is arranged at the center of the flame tube 20). The flame stabilizing disc 62 is located relatively to the outer side of the swirler 61 in the radial direction of the flame tube 20, i.e. the flame stabilizing disc 62 is located at the outer ring. Typically the exhaust nozzle 35 is stronger than the structure of the gas nozzle 45 and preferably a flame stabilizing disc 62 is fixed to the exhaust nozzle 35. In the embodiment shown in fig. 2, the flame holding disks 62 include a middle-ring layer flame holding disk 62a and an outer-ring layer flame holding disk 62 b. Under the action of the flame stabilizing assembly 60, a low-speed backflow area is formed in the area of the exhaust gas nozzle 35, so that the condition that flame is misfired due to direct blowing of combustion-supporting air is prevented.

It is understood that, in the present invention, the flame stabilizing assembly 60 may not include the flame stabilizing disk 62, and the swirler 61 is used to stabilize the flame of the burner 100.

Due to the flame holding assembly 60, the air forms a vortex after passing through the flame holding assembly 60, i.e. flows from the outer ring towards the middle. In order to ensure sufficient combustion, the exhaust gas nozzle 35 protrudes more downstream than the gas nozzle 45, so that the exhaust gas relatively positioned at the outer ring flows towards the gas nozzle 45 under the action of the vortex, and is sufficiently contacted with the gas flame relatively positioned at the inner ring, thereby being beneficial to sufficiently combusting the exhaust gas. For example, as shown in fig. 3, the center layer exhaust gas nozzle 35a projects more downstream than the center layer gas nozzle 45a, the middle ring layer exhaust gas nozzle 35b projects more downstream than the middle ring layer gas nozzle 45b, and the outer ring layer exhaust gas nozzle 35c projects more downstream than the outer ring layer gas nozzle 45 c. The all exhaust nozzles 35 are projected more downstream than the all gas nozzles 45. It will be appreciated that the gas nozzles 45 located at the outer ring are preferably arranged to project further downstream than the gas nozzles 45 located at the inner ring. For example, the middle tier gas nozzle 45b projects more downstream than the center tier gas nozzle 45a, and the outer tier gas nozzle 45c projects more downstream than the middle tier gas nozzle 45 b. It will be appreciated that the exhaust nozzle 35 located at the outer periphery is preferably provided so as to project further downstream than the exhaust nozzle 35 located at the inner periphery. For example, the middle tier exhaust nozzle 35b projects more downstream than the center tier exhaust nozzle 35a, and the outer tier exhaust nozzle 35c projects more downstream than the middle tier exhaust nozzle 35 b.

Preferably, the burner 100 further comprises a furnace (not shown) and an exhaust channel (not shown). The furnace is connected to the flame tube 20 downstream of the flame tube 20. The exhaust gas channel is then connected to the furnace downstream of the furnace. The temperature sensor is arranged in the furnace and used for sensing the temperature in the furnace. An oxygen concentration sensor is disposed in the exhaust passage for sensing an oxygen concentration in the burned gas.

As is known to those skilled in the art, low heating value flue gases typically contain a large amount of non-combustible components, such as: nitrogen, water vapor, carbon dioxide and the like, wherein the ratio of non-combustible components can reach more than 90%, and the low-calorific-value waste gas cannot be continuously and stably combusted when being independently combusted, so that a stable heat source is required to be provided by fuel gas (such as natural gas or methane and other high-calorific-value fuels) to ensure that toxic and harmful organic matters in the waste gas are fully pyrolyzed.

In the preferred embodiment of the utility model, the natural gas is injected into the hearth in three layers, namely, central layer fuel gas, middle ring layer fuel gas and outer ring layer fuel gas. The three layers of gas are respectively introduced into the combustor 100 through the three gas inlets 41, and the flow of the three layers of natural gas pipelines can be independently controlled. The central layer fuel gas is used as long open fire to stabilize the flame of the combustor 100, the middle ring layer fuel gas and the outer ring layer fuel gas are used as afterburning fuel gas, and the afterburning fuel gas is supplemented for combustion when the temperature of the hearth is lower than the range (such as 1000-1100 ℃) of the design requirement. The large-flow waste gas enters a waste gas inlet pipe 34 from a waste gas collecting pipe 31, and the waste gas inlet pipe 34 is connected to a central layer waste gas spray gun, a middle ring layer waste gas spray gun and an outer ring layer waste gas spray gun. The three rings of waste gas spray guns and the three rings of gas spray guns are arranged at intervals in the radial direction, so that the continuity of flame space arrangement is ensured, and the effect of stabilizing flame is achieved.

The ignition gun 50 is arranged obliquely and centrally, and is biased to the central layer gas position, and is responsible for igniting the flame of the central stable combustion spray gun, and the flame is diffused from inside to outside in sequence, so that the whole combustor 100 is ignited. Combustion air enters the system from the windbox 10 and enters the combustion zone after being reasonably organized and distributed by the flame holder assemblies 60 at the head of the burner 100.

The flame holding assembly 60 spatially divides the combustion air into laminar flow from the inside to the outside: the swirling wind (central layer gas area) → the direct current wind (middle ring layer gas area and central layer exhaust gas area) → the low speed swirling wind (middle ring layer exhaust gas area) → the direct current wind (outer ring layer gas area) → the low speed swirling wind (outer ring layer exhaust gas area) → the direct current wind. The design of gas staging plus air staging can reduce localized high temperature zones in the combustion zone, making the flame temperature more uniform, thereby reducing the formation of nitrogen oxides (NOx). The burner 100 of the present invention incorporates low heating value flue gases between the layers of flame, which can reduce the temperature of the flame region and thereby further reduce the formation of nitrogen oxides (NOx).

In actual operation, the ignition gun 50 is ignited first, after the flame of the ignition gun 50 is stabilized (determined by the fire detection of the ignition flame), the central layer gas is introduced, the ignition gun 50 ignites the central layer gas, and after the flame of the central layer gas is stabilized, the ignition gun 50 is closed; after the temperature of the hearth reaches the designed waste gas incineration temperature (such as 1100 ℃), slowly introducing waste gas, feeding back the oxygen concentration of the hearth (not lower than 3% if required) and the temperature value of the hearth by a system in the process of increasing the flow rate of the waste gas, slowly increasing the flow rate of natural gas when the temperature of the hearth is lower than 1000 ℃, and properly supplementing combustion air when the oxygen content of the hearth is close to 3%. The load of the combustor 100 is slowly increased according to the above process flow. The design flow rate of the gas in the central layer gas channel is 30-150Nm³H, when the gas flow is increased to be more than 150Nm³Opening the inlet of the middle ring layer fuel gas channel when the pressure is/h; continuing to increase the load when the gas flow rate increases to, for example, greater than 550Nm³And when the pressure exceeds the preset pressure, opening the inlet of the gas channel of the outer ring layer. The total design flow of the gas channel is, for example, 1350Nm³H; if the temperature of the hearth is maintained enough by the combustion of the waste gas, the middle ring layer fuel gas and the outer ring layer fuel gas are not increased in the process of increasing the load. The total design flow of the waste gas channel is 10000Nm³/h。

In other words, in the actual operation process, the waste gas spray guns are filled with waste gas, and whether the fuel gas in the middle ring layer and the fuel gas in the outer ring layer are filled with the fuel gas or not is determined according to the operation condition. When the heat value of the waste gas is low and the combustion can not be maintained by self, the fuel gas of the middle ring layer and the fuel gas of the outer ring layer are both required to be introduced as afterburning; when the heat value of the waste gas is high and the self-stable combustion can be maintained, the fuel gas of the middle ring layer and the fuel gas of the outer ring layer can not be introduced. The utility model can ensure the stable combustion of the waste gas combustor 100 on the premise of reducing the consumption of high-heat value gas through reasonable afterburning gas design and field regulation.

In one embodiment of the utility model, which is not shown, the flame tube 20 is configured as a cylinder, and in the projection plane of the burner 100 in the axial direction of the flame tube 20, the plurality of exhaust gas nozzles 35 and the plurality of gas nozzles 45 are still arranged on a plurality of circumferences with the center O of the flame tube 20 in the projection plane as the center O, wherein on the same circumference, the exhaust gas nozzles 35 and the gas nozzles 45 are arranged at intervals. That is, the plurality of exhaust nozzles 35 and the plurality of gas nozzles 45 are provided at intervals in the circumferential direction. Preferably, the plurality of exhaust gas nozzles 35 and the plurality of gas nozzles 45 are evenly distributed over the circumference. In another embodiment of the present invention, which is not shown, in a projection plane of the combustor 100 along the axial direction of the liner 20, the plurality of exhaust gas nozzles 35 and the plurality of gas nozzles 45 are arranged in a two-dimensional matrix, and in two perpendicular directions of the matrix, the plurality of exhaust gas nozzles 35 and the plurality of gas nozzles 45 are arranged at intervals.

According to the burner 100 for waste gas incineration of the present invention, the waste gas nozzle 35 and the gas nozzle 45 are arranged at an interval, which is beneficial for the waste gas to fully contact with the flame (i.e. high temperature flue gas) generated by the combustion of the high heat value gas, so that the waste gas is fully combusted, and simultaneously, the heat generated by the combustion can be uniformly distributed in the flame tube 20 as much as possible, thereby reducing the local high heat (for example, over 1400 ℃), and further greatly reducing the generation of nitrogen oxides.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the utility model to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (17)

1. A burner for incineration of exhaust gases, comprising:

a windbox for introducing air required for combustion;

a flame tube located downstream of the windbox and in gaseous communication with the windbox in an axial direction;

a plurality of exhaust gas nozzles disposed in the flame tube;

a plurality of gas nozzles disposed in the flame tube; and

the ignition end of the ignition gun is arranged in the flame tube,

wherein the plurality of exhaust gas nozzles are spaced apart from the plurality of gas nozzles.

2. The burner for exhaust gas incineration of claim 1, wherein the flame tube is configured in a cylindrical shape, and the plurality of exhaust gas nozzles and the plurality of gas nozzles are disposed at intervals in a radial direction of the flame tube.

3. The burner for exhaust gas incineration of claim 2, wherein the gas nozzle is closer to an axis of the flame tube than the exhaust gas nozzle.

4. The burner for exhaust gas incineration according to claim 3, wherein in a projection plane of the burner in an axial direction of the flame tube, the plurality of gas nozzles are disposed on M circumferences centered on a center of the flame tube in the projection plane, the plurality of exhaust gas nozzles are disposed on M circumferences centered on a center of the flame tube in the projection plane, M turns of the gas nozzles are disposed at intervals from M turns of the exhaust gas nozzles, where M is a natural number greater than or equal to 2.

5. Burner for incineration of flue gases according to claim 4, characterised in that M-3.

6. The burner for exhaust gas incineration of claim 4, wherein a number of the exhaust gas nozzles of a K-th turn is greater than a number of the gas nozzles of the K-th turn, where K is a natural number less than or equal to M, wherein a turn located at a radially innermost turn is a 1 st turn, and a turn located at a radially outermost turn is an Mth turn.

7. The burner for exhaust gas incineration of claim 6, wherein a number of the exhaust gas nozzles of a K-th turn is 2 times a number of the gas nozzles of the K-th turn.

8. Burner for incineration of exhaust gases according to claim 4,

the exhaust gas nozzle projects further downstream than the gas nozzle, and/or

The gas nozzle located at the outer ring is projected more downstream than the gas nozzle located at the inner ring, and/or

The exhaust gas nozzle located at the outer ring is projected more downstream than the exhaust gas nozzle located at the inner ring.

9. The burner for exhaust gas incineration according to claim 1, wherein the flame tube is configured in a cylindrical shape, and in a projection plane of the burner in an axial direction of the flame tube, the plurality of exhaust gas nozzles and the plurality of gas nozzles are disposed on a plurality of circumferences centered on a center of the flame tube in the projection plane, wherein the exhaust gas nozzles and the gas nozzles are disposed at intervals on the same circumference.

10. Burner for flue gas incineration according to any of the claims 4 to 9, wherein the plurality of flue gas nozzles and the plurality of gas nozzles are evenly distributed over the circumference.

11. The burner for exhaust gas incineration of any one of claims 4 to 9, further comprising:

a preset pipe, at least a part of which extends in an axial direction of the flame tube and is disposed at a center of the flame tube; and

and the at least one swirler is sleeved on the preset pipe.

12. The burner for exhaust gas incineration of claim 11, further comprising at least one flame stabilizing disk fixed to the exhaust gas nozzle, the flame stabilizing disk being located outside the swirler in a radial direction of the flame tube.

13. Burner for exhaust gas incineration according to any of the claims 4-8, further comprising M gas inlets for introducing gas required for combustion, wherein the Nth gas inlet is connected to all the gas nozzles of the Nth ring, the gas inlets being provided with valves, N being a natural number less than or equal to M.

14. The burner for exhaust gas incineration of any one of claims 4 to 9, wherein the gas nozzle closest to a firing end of the burning torch is located on the 1 st of the circumferences in a projection plane of the burner in an axial direction of the flame tube, wherein the circumference located on a radially innermost side is the 1 st of the circumferences.

15. Burner for incineration of exhaust gases according to claim 14,

the firing end of the firing gun is arranged on the 1 st circumference in the projection plane of the burner in the axial direction of the flame tube, and/or

The distance between the center of the ignition end of the ignition gun and the center of the gas nozzle closest to the ignition end of the ignition gun is not more than 200 mm.

16. The burner for exhaust gas incineration of any one of claims 1 to 9, further comprising:

a furnace connected to the flame tube downstream of the flame tube; and

and the temperature sensor is arranged in the hearth and used for sensing the temperature in the hearth.

17. The burner for waste gas incineration of claim 16, further comprising an oxygen concentration sensor disposed downstream of the furnace for sensing an oxygen concentration in the post-combustion flue gas.

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