CN209819536U - Full premix combustor and full premix boiler - Google Patents

Abstract

The utility model discloses a full premix combustor and full premix boiler, wherein, full premix combustor includes: a body having a combustion face; the main body can input premixed gas and form combustion on the combustion surface; the main part is fixedly provided with a silencing structure. The main body is of a cylindrical structure. The natural frequency of the body provided with the sound deadening structure is higher than that in the case where the sound deadening structure is not provided. The utility model provides a full premix combustor and full premix boiler can reduce the noise that produces among the full premix combustor combustion process, promotes the user and uses experience.

Description

Full premix combustor and full premix boiler

Technical Field

The application relates to the field of gas combustion equipment, in particular to a full premix burner and a full premix boiler.

Background

The full premix burner is a device for burning combustible gas mixed in a premix chamber. Some fully premixed combustion devices in the prior art, especially applied to the field of fully premixed boilers, may include a burner, a fan, an ignition needle, and the like. After the combustible gas enters the burner, the combustible gas is sprayed out from fire holes in the side wall of the burner to form combustion flame. However, a large howling noise problem exists in the low-load operation process of the fully premixed boiler, and the use experience of a user is influenced greatly.

SUMMERY OF THE UTILITY MODEL

The inventor finds that the full premix combustion boiler is easy to resonate when in low-load operation, and then generates larger squeal noise. In the low-load operation, the total amount of gas output by the combustor is small, and in the state, the change of the small gas amount can cause the change of the gas-air equivalence ratio (also called as air-fuel ratio), so that the combustion heat release rate has a small change, the small change can generate sound pressure disturbance, namely combustion oscillation, and the combustion oscillation is coupled with the natural frequency of the combustor to generate resonance noise.

In view of the deficiencies of the prior art, an object of the present application is to provide a fully premixed burner and a fully premixed boiler, so as to reduce the noise generated during the combustion process of the fully premixed burner and improve the user experience.

In order to achieve the purpose, the technical scheme is as follows:

a fully premixed combustor comprising:

a body having a combustion face; the main body can input premixed gas and form combustion on the combustion surface; the main part is fixedly provided with a silencing structure.

In a preferred embodiment, the main body has a cylindrical structure, and the sound attenuating structure is disposed inside the main body.

As a preferred embodiment, the natural frequency of the body provided with the sound deadening structure is higher than the natural frequency of the body not provided with the sound deadening structure.

In a preferred embodiment, the natural frequency of the body provided with the sound deadening structure is 1.2 times or more or 0.8 times or less the natural frequency of the body not provided with the sound deadening structure.

As a preferred embodiment, the burner has a flame oscillation frequency range when burning; the sound attenuating structure causes the natural frequency of the body to be outside the flame oscillation frequency range.

In a preferred embodiment, the sound deadening structure makes the natural frequency of the main body larger than a flame oscillation frequency range corresponding to a maximum combustion load of one-half or less of the combustor.

In a preferred embodiment, the sound attenuating structure is integrally formed with the main body, or is welded to an inner wall of the main body.

As a preferred embodiment, the sound-deadening structure includes a sound-deadening plate fixed to an inner wall of the main body.

In a preferred embodiment, the plate surface of the sound-absorbing plate is parallel to the longitudinal direction of the main body.

As a preferred embodiment, the ratio of the length of the sound-absorbing panel to the length of the main body in the longitudinal direction of the main body ranges from 0.25 to 0.75.

As a preferred embodiment, a plurality of said acoustic panels are uniformly distributed circumferentially inside said main body; one end of each sound-absorbing plate is fixedly connected with the inner wall of the main body, and the other end of each sound-absorbing plate is fixedly connected with the other sound-absorbing plates.

As a preferred embodiment, the projection of the sound attenuating structure on a surface perpendicular to the length direction along the length direction of the main body is cross-shaped or Y-shaped.

As a preferred embodiment, the ratio of the gas flow area at the location of the sound-deadening structure to the inner cross-sectional area of the body at that location is greater than 80%.

In a preferred embodiment, the distance between the sound attenuating structure and either end of the body is greater than or equal to 1/6 times the length of the body.

A fully premixed boiler comprising: a burner as claimed in any one of the preceding embodiments.

Has the advantages that:

the full premix combustor that this application embodiment provided is through being equipped with amortization structure, and the natural frequency of main part can be changed to amortization structure for produced combustion oscillation staggers rather than the natural frequency when the combustor is in the low-load operation, thereby reduces the probability that resonance produced, and then the production of noise reduction promotes user and uses experience.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a fully premixed combustor provided in the embodiments of the present application;

FIG. 2 is another view of FIG. 1;

fig. 3 is a combustion state area diagram of fig. 1 and a burner not provided with a sound deadening structure.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all 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 in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1 to 3. In one embodiment, the present application provides a fully premixed combustor comprising: a body 100 having a combustion face 101; the main body 100 is capable of inputting premixed gas and forming combustion on the combustion surface 101; the main body 100 is fixedly provided with a noise reduction structure 200.

In this embodiment, the silencing structure 200 can change the natural frequency of the main body 100, so that the combustion oscillation generated by the burner during low-load operation is staggered from the natural frequency of the burner, the natural frequency of the burner is prevented from being coupled with the combustion oscillation, the probability of resonance generation is reduced, the noise generation is reduced, and the user experience is improved.

In addition, the main body 100 provided with the silencing structure 200 has a larger combustion operation range compared with the main body without the silencing structure, and is suitable for more combustion conditions. This effect can also be confirmed by the experimental results in the following examples.

In the embodiment of the present application, the fully premixed burner may be a flat plate burner or a tubular burner. In the embodiment of the flat plate burner, at least part of the combustion surface is a plane surface, and accordingly, the premixed gas is introduced upstream of the combustion surface. The sound attenuating structure is disposed upstream of the combustion face and changes the natural frequency of the combustor.

In the present embodiment, the main body 100 is cylindrical, that is, the full premix burner is a cylindrical burner, and the combustion surface 101 is located on a side wall of the main body 100. Preferably, the body 100 may have a cylindrical structure. In addition, the body 100 may have other cylindrical structures, such as a prism or other shapes, and other cylindrical structures are not excluded in this application. The side wall of the cylindrical body 100 may be provided with a plurality of fire holes to form the combustion surface 101. The premixed gas (premixed gas) in the body 100 may be discharged from the fire hole.

In this embodiment, the outer sidewall of the cylindrical burner forms a combustion surface 101, and fire holes are distributed on the sidewall of the main body 100. The fire holes may be uniformly or non-uniformly distributed on the sidewall of the main body 100, and the present application is not limited thereto.

In the present embodiment, the cylindrical body 100 has an inlet at an upper end thereof to input the premixed gas. The sound attenuating structure 200 is disposed upstream of the combustion face 101. The premixed gas input into the main body 100 may be a mixed gas of fuel gas and air. Wherein, the fuel gas can be natural gas, coal gas and the like. The premixing device mixes the fuel gas and air and inputs them into the full premix burner through an inlet of the main body 100 through an outlet of the blower.

In the fully premixed burner provided by the present embodiment, the sound attenuation structure 200 is provided, so that the natural frequency of the cylindrical main body 100 is changed, and the probability of coupling with the flame oscillation frequency is reduced, for example, the natural frequency of the cylindrical main body 100 provided with the sound attenuation structure 200 may be lower than the flame oscillation frequency or higher than the flame oscillation frequency.

In the present embodiment, the sound-deadening structure 200 changes the natural frequency of the body 100. Specifically, in order to have the effect of reducing resonance noise, the natural frequency of the main body 100 is 1.2 times or more or 0.8 times or less of the natural frequency in the case where the noise reduction structure 200 is not provided. Thus, the natural frequency change rate of the main body 100 provided with the sound deadening structure 200 is 20% or more compared to the case where the sound deadening structure 200 is not provided.

Further, the natural frequency of the body 100 is higher than that in the case where the sound deadening structure 200 is not provided. Specifically, the natural frequency of the cylindrical body 100 is 1.2 times or more the natural frequency in the case where the noise cancellation structure 200 is not provided. Therefore, the flame oscillation frequency of the combustor in low-load operation can be better avoided, and the combustion noise is effectively reduced.

In one embodiment, the sound attenuating structure causes the natural frequency of the body to be greater than a range of flame oscillation frequencies corresponding to a maximum combustion load of less than one-half of the combustor. The combustor has the highest burning load, and the combustor corresponds certain flame oscillation frequency range at the highest burning load below the half, and the amortization structure can make the natural frequency of main part avoid this flame oscillation frequency range, so reduce the noise that produces in the full premix combustor combustion process, promote user's use and experience.

To further reduce the chance of resonance and thus preferably noise, the burner has a range of flame oscillation frequencies during combustion. The sound deadening structure 200 makes the natural frequency of the cylindrical body 100 out of the flame oscillation frequency range.

Referring now to FIG. 3, therein is shown a graphical representation of burner test data versus combustion state area for the embodiment of FIG. 1. From the graph, it can be seen that, in the main body without the noise reduction structure in fig. 1, oscillation noise exists under the combustion load of 40% or less (4 data points exist), and it can be seen that resonance easily occurs during low-load operation to generate corresponding resonance noise, so that a user may hear noise such as howling which may destroy the user experience.

Continuing with fig. 3, the operating region (the region between the upper limit value curve and the lower limit value curve) of the main body 100 provided with the sound deadening structure 200 does not have the oscillating noise, so it can be seen that the main body 100 provided with the sound deadening structure 200 has completely avoided the occurrence of the resonance noise.

Referring to fig. 3 again, for the combustion operation interval (the adjustable range of the gas valve of the boiler), the upper limit value of the operation interval of the main body 100 provided with the silencing structure 200 is significantly higher than the upper limit value of the main body 100 not provided with the silencing structure 200, and the lower limit value of the operation interval is approximately the same, so it can be seen that the main body 100 provided with the silencing structure 200 has a larger combustion operation interval compared with the main body not provided with the silencing structure, and is suitable for more combustion conditions.

In the embodiment of the present application, a sound-deadening structure 200 is fixedly provided inside the main body 100. Wherein the sound deadening structure 200 is fixed to the inner wall of the cylindrical body 100. The sound-deadening structure 200 may be integrated with the cylindrical body 100 or may be fixedly attached to the inner wall of the body 100. For example, the sound deadening structure 200 may be welded to the inner wall of the cylindrical main body 100. Of course, the sound-deadening structure 200 may be connected to the inner wall of the tubular body 100 by bolts, riveted to the inner wall of the tubular body 100, or the like, and the present application is not limited to this.

In the present embodiment, the sound-deadening structure 200 can increase the weight of the combustor. The sound attenuating structure 200 may also increase the structural rigidity of the combustor. Thus, the sound attenuating structure 200 increases the natural frequency of the main body 100, preferably by staggering it from the flame oscillation frequency, reducing the probability of resonance.

In this embodiment, the shape and structure of the sound-absorbing structure 200 may be a plurality of types, and may be a reinforcing rib, or a rod or a plate installed inside the main body 100, and the sound-absorbing structure 200 may also be installed on the outer wall of the main body 100, so as to enhance the rigidity of the main body 100 and increase the natural frequency of the main body 100. In the present embodiment, the sound-deadening structure 200 includes a sound-deadening plate fixed to the inner wall of the cylindrical body 100. The sound-absorbing plate can be a straight plate or a bent plate, and the application is not limited to the exclusive use.

The sound-deadening plate is mounted across the inside of the main body 100. In order to reduce the influence on the flow of the premixed gas in the burner and ensure the normal supply of the premixed gas, the plate surface of the sound-absorbing plate is parallel to the longitudinal direction of the cylindrical body 100. Wherein, the thickness direction of the silencer plate is vertical to the flowing direction of the premixed gas. Of course, the sound-absorbing plate may be disposed obliquely, for example, the plate surface of the sound-absorbing plate may be at an acute angle to the longitudinal direction of the cylindrical body 100.

To reduce the influence on the flow of the premixed gas in the combustor, in a preferred embodiment, the ratio of the gas flow area at the position of the sound-deadening structure 200 to the inner cross-sectional area of the main body 100 at that position is greater than 80%.

In order to have a preferable noise reduction effect, the ratio of the length of the sound-absorbing panel to the length of the cylindrical body 100 in the longitudinal direction of the cylindrical body 100 is in the range of 0.25 to 0.75. Further, the distance between the sound-deadening structure 200 and any one end of the cylindrical body 100 is greater than or equal to 1/6 the length of the cylindrical body 100, so that it is possible to have a superior noise-reducing effect.

As shown in fig. 2, the length of the tubular body 100 is L, and the length of the sound deadening structure 200 is L. Wherein L is 0.25L to 0.75L. The length of the sound-deadening structure 200 and the lower end or the upper end (when the reader faces fig. 2) of the cylindrical body 100 is d, wherein d ≧ 1/6L.

In the present embodiment, a plurality of the sound-absorbing plates are uniformly distributed in the circumferential direction inside the cylindrical body 100. One end of each of the sound-absorbing panels is fixedly connected to the inner wall of the cylindrical main body 100, and the other end is fixedly connected to the other sound-absorbing panels. Each of the muffling plates has a length substantially equal to half of the inner diameter of the cylindrical body 100.

The sound deadening structure 200 has a cross shape (cross shape as shown in fig. 1) or a Y shape in projection on a surface perpendicular to the length direction along the length direction of the cylindrical body 100. In one embodiment, three acoustical boards are uniformly arranged along the circumferential direction, and two adjacent acoustical boards form an included angle of 120 degrees to form a Y shape.

In another embodiment, the present application provides a fully premixed boiler comprising: a burner as claimed in any one of the preceding embodiments.

In this embodiment, the burner is connected to a fan. The inlet of main part 100 sets up upwards, and the fan sets up in the top of main part 100 to be linked together with the inlet of main part 100. The flue gas outlet is positioned at the lower part of the shell of the fully premixed boiler. A chamber inside the housing forms a furnace in which the fully premixed burner is located. The fuel gas enters the burner (main body 100) from the top down. Correspondingly, the smoke generated by combustion is basically discharged from the smoke outlet from the top to the bottom.

By adopting the structure, the fuel gas and the flue gas not only can be acted by gravity to further improve the flow velocity of the fuel gas and the flue gas, but also can utilize the shell to bear the fan, so as to reduce the volume of the fully premixed boiler.

Of course, in other alternative embodiments, the inlet of the burner is located at the lower part of the housing, and the fan corresponding to the inlet of the burner may also be arranged at the lower part of the housing, and correspondingly, the flue gas outlet is located at the top of the housing, and the fan is located below the burner.

Any numerical value recited herein includes all values from the lower value to the upper value that are incremented by one unit, provided that there is a separation of at least two units between any lower value and any higher value. For example, if it is stated that the number of a component or a value of a process variable (e.g., temperature, pressure, time, etc.) is from 1 to 90, preferably from 20 to 80, and more preferably from 30 to 70, it is intended that equivalents such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also expressly enumerated in this specification. For values less than 1, one unit is suitably considered to be 0.0001, 0.001, 0.01, 0.1. These are only examples of what is intended to be explicitly recited, and all possible combinations of numerical values between the lowest value and the highest value that are explicitly recited in the specification in a similar manner are to be considered.

Unless otherwise indicated, all ranges include the endpoints and all numbers between the endpoints. The use of "about" or "approximately" with a range applies to both endpoints of the range. Thus, "about 20 to about 30" is intended to cover "about 20 to about 30", including at least the endpoints specified.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional.

A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed inventive subject matter.

Claims (15)

1. A fully premixed combustor characterized by comprising:

a body having a combustion face; the main body can input premixed gas and form combustion on the combustion surface; the main part is fixedly provided with a silencing structure.

2. The fully premixed combustor according to claim 1, wherein the main body is a cylindrical structure, and the noise reduction structure is disposed inside the main body.

3. The fully premixed combustor according to claim 1, wherein a natural frequency of a body provided with the sound attenuating structure is higher than a natural frequency of a body not provided with the sound attenuating structure.

4. The fully premixed combustor of claim 1, wherein the natural frequency of the body provided with the sound attenuating structure is 1.2 times or more or 0.8 times or less the natural frequency of the body not provided with the sound attenuating structure.

5. The fully premixed combustor according to claim 1, wherein the combustor has a flame oscillation frequency range when burning; the sound attenuating structure causes the natural frequency of the body to be outside the flame oscillation frequency range.

6. The fully premixed combustor of claim 1, wherein the noise dampening structure causes the body to have a natural frequency greater than a range of flame oscillation frequencies corresponding to a maximum combustion load of less than one-half of the combustor.

7. The burner of claim 2, wherein the sound attenuating structure is a unitary structure with the main body or is welded to an inner wall of the main body.

8. The burner of claim 7, wherein the sound attenuating structure comprises a sound attenuating plate secured to an inner wall of the body.

9. The burner of claim 8, wherein the plate surface of the acoustical panel is parallel to the length of the body.

10. The burner of claim 8, wherein the ratio of the length of the acoustical panel to the length of the body along the length of the body ranges from 0.25 to 0.75.

11. The burner of claim 8, wherein a plurality of said acoustical panels are uniformly distributed circumferentially within said body; one end of each sound-absorbing plate is fixedly connected with the inner wall of the main body, and the other end of each sound-absorbing plate is fixedly connected with the other sound-absorbing plates.

12. The burner of claim 11, wherein a projection of the sound attenuating structure along a length direction of the body on a surface perpendicular to the length direction is cross-shaped or Y-shaped.

13. The burner of claim 7, wherein a ratio of a gas flow area at a location of the sound attenuating structure to an internal cross-sectional area of the body at the location is greater than 80%.

14. The burner of claim 7, wherein the distance between the sound attenuating structure and either end of the main body is greater than 1/6 the length of the main body.

15. A fully premixed boiler, comprising: a burner as claimed in any one of claims 1 to 14.