Natural ventilation burner of multi-layer small injection structure

Abstract

The utility model discloses a natural ventilation burner of a multi-layer small injection structure. The natural ventilation burner comprises an outer-layer fuel gas channel, a central fuel gas channel, a combustion-supporting air channel and a backflow flue gas channel. According to the utility model, the gas injection structure which is finely and dispersedly arranged is taken as a core, the gas injection structure is divided to be smaller and more dispersedly, flue gas and combustion-supporting air are respectively injected by gas at different positions, and the combustion organization is optimized and the temperature of a reaction area is homogenized in a manner of reducing the injection structure and performing multi-point dispersive arrangement, so that the combustion efficiency is improved. Safe and sufficient combustion under the natural ventilation condition is achieved, and meanwhile low NOx emission is kept.

Description

Technical Field

[0001] This utility model relates to the field of burner technology, specifically to a natural ventilation burner with a multi-layer small ejector structure. Background Technology

[0002] Natural draft burners do not have combustion fans; they rely on the negative pressure in the furnace to draw in combustion air. This results in lower air momentum, making combustion difficult to organize, leading to poor flame stability and higher NOx emissions. Designing a natural draft burner that can effectively and completely combust while controlling pollutant formation and achieving lower NOx emissions under natural draft conditions is a problem that needs to be solved by scientific and technological personnel. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-layer small ejector structure natural ventilation burner, which solves the problems of low air momentum, difficulty in combustion organization, poor flame stability, and high NOx emissions in existing natural ventilation burners.

[0004] This utility model provides a multi-layer small ejector structure natural ventilation burner, comprising: an outer gas channel, a central gas channel, a combustion air channel, and a return flue gas channel; the outer gas channel includes an outer gas inlet, an outer gas ring pipe, a first peripheral gas branch pipe, a first peripheral gas branch pipe nozzle, a combustion-smoke mixing pipe, a second peripheral gas branch pipe, a second peripheral gas branch pipe nozzle, and a first combustion-air mixing pipe; the central gas channel includes a central gas inlet, a central gas ring pipe, a central gas branch pipe, a central gas branch pipe nozzle, a second combustion-air mixing pipe inlet, and a second combustion-air mixing pipe; the combustion air channel includes an air inlet, an air chamber, and an air outlet; the return flue gas channel includes a flue gas inlet, a flue gas chamber, and a flue gas ring chamber.

[0005] The outer gas inlet is sequentially connected to the outer gas ring pipe, several peripheral gas branch pipes I, and several peripheral gas branch pipes II. The peripheral gas branch pipes I are connected to several peripheral gas branch pipe I nozzles, and the peripheral gas branch pipes II are connected to several peripheral gas branch pipe II nozzles. A combustion-smoke mixing pipe is installed downstream of the peripheral gas branch pipe I nozzle, and a combustion-air mixing pipe I is installed downstream of the peripheral gas branch pipe II nozzle. The central gas inlet is sequentially connected to the central gas ring pipe and several central gas branch pipes. The central gas branch pipes are connected to several central gas branch pipe nozzles. A combustion-air mixing pipe II inlet is installed downstream of the central gas branch pipe nozzles. The combustion-air mixing pipe II inlet is connected to a combustion-air mixing pipe II located inside the air outlet. The combustion-air mixing pipe II inlet is located inside the air chamber and communicates with the air chamber. The air inlet is sequentially connected to the air chamber and the air outlet. The flue gas inlet is sequentially connected to the flue gas chamber and the flue gas ring chamber.

[0006] Further, 16 peripheral gas branch pipes one connect 16 peripheral gas branch pipe one nozzles.

[0007] Further, 8 peripheral gas branch pipes two connect 8 peripheral gas branch pipe two nozzles.

[0008] Further, 4 central gas branch pipes connect 4 central gas branch pipe nozzles.

[0009] The natural ventilation combustor with the multi-layer small injection structure has the following beneficial effects: the injection structure of the gas to the flue gas is refined, the structure is smaller and more dispersed, the injection structure is reduced, the multi-point dispersed arrangement mode is used, the flue gas weakening reaction is more uniform and sufficient, the local high temperature of the combustion area is more inhibited, and the generation of NOx is more inhibited; the injection structure of the gas to the air is refined, the structure is smaller and more dispersed, the injection structure is reduced, the multi-point dispersed arrangement mode is used, the gas and the air are more uniformly and sufficiently mixed, the combustion organization is more optimized, and the flame temperature in the combustion area is more uniform; in the outermost injection structure, the gas injection air structure and the gas injection flue gas structure are arranged at intervals, the flue gas weakening reaction is utilized, and the gas injection air structure is utilized to stabilize the flame; the reaction temperature is reduced, and the combustion instability that may occur due to the weakening reaction is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0011] Fig. 1 is a front view of the natural ventilation combustor with the multi-layer small injection structure of the present application;

[0012] Fig. 2 is a sectional view of the natural ventilation combustor with the multi-layer small injection structure of the present application;

[0013] Fig. 3 is a perspective view of the natural ventilation combustor with the multi-layer small injection structure of the present application;

[0014] Fig. 4 is a perspective view of the natural ventilation combustor with the multi-layer small injection structure of the present application.

[0015] Illustration: 100-outer layer gas passage; 110-outer layer gas inlet; 120-outer layer gas ring pipe; 130-outer peripheral gas branch pipe one; 140-outer peripheral gas branch pipe one nozzle; 150-fuel and smoke mixing pipe; 160-outer peripheral gas branch pipe two; 170-outer peripheral gas branch pipe two nozzle; 180-fuel and air mixing pipe one; 200-central gas passage; 210-central gas inlet; 220-central gas ring pipe; 230-central gas branch pipe; 240-central gas branch pipe nozzle; 250-fuel and air mixing pipe two inlet; 260-fuel and air mixing pipe two; 300-combustion-supporting air passage; 310-air inlet; 320-air chamber; 330-air outlet; 400-backflow smoke gas passage; 410-smoke gas inlet; 420-smoke gas chamber; 430-smoke gas ring chamber. DETAILED DESCRIPTION

[0016] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be pointed out that the following detailed description is exemplary and is intended to provide further description of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0017] For ease of description, spatial relative terms such as "above", "upper", "top", "up", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device as described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0018] Now, exemplary embodiments according to this application will be described in greater detail by referring to the drawings. These exemplary embodiments can be implemented in various different forms, and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, and in the drawings, the thicknesses of layers and regions are exaggerated for clarity, and the same reference numerals are used throughout the drawings to designate the same elements, and thus a description thereof will be omitted.

[0019] Referring to Figs. 1 to 4 The embodiment of the utility model provides a natural ventilation combustor with multilayer small injection structure, it includes outer layer gas channel 100, center gas channel 200, combustion air channel 300, backflow flue gas channel 400.

[0020] Wherein, outer layer gas channel 100 includes outer layer gas import 110, outer layer gas ring pipe 120, peripheral gas branch pipe one 130, peripheral gas branch pipe one shower head 140, fuel smoke mixing pipe 150, peripheral gas branch pipe two 160, peripheral gas branch pipe two shower head 170, combustion air mixing pipe one 180, center gas channel 200 includes center gas import 210, center gas ring pipe 220, center gas branch pipe 230, center gas branch pipe shower head 240, combustion air mixing pipe two import 250, combustion air mixing pipe two 260, combustion air channel 300 includes air import 310, air chamber 320, air outlet 330, backflow flue gas channel 400 includes flue gas import 410, flue gas chamber 420, flue gas ring chamber 430.

[0021] Specifically, outer layer gas import 110 is sequentially connected outer layer gas ring pipe 120, 16 peripheral gas branch pipe one 130, 8 peripheral gas branch pipe two 160, 16 peripheral gas branch pipe one 130 is connected 16 peripheral gas branch pipe one shower head 140, 8 peripheral gas branch pipe two 160 is connected 8 peripheral gas branch pipe two shower head 170, the downstream of peripheral gas branch pipe one shower head 140 is provided fuel smoke mixing pipe 150, the downstream of peripheral gas branch pipe two shower head 170 is provided combustion air mixing pipe one 180.

[0022] The peripheral gas enters the outer gas ring pipe 120 through the outer gas inlet 110, a part of which enters the 16 peripheral gas branch pipes one 130 and is sprayed out through the 16 peripheral gas branch pipe one nozzles 140 into the smoke gas mixing pipe 150. The front end of the smoke gas mixing pipe 150 is communicated with the smoke gas chamber 420. The high-speed gas sprayed out through the peripheral gas branch pipe one nozzles 140 generates negative pressure at the front end of the smoke gas mixing pipe 150, and the smoke gas in the smoke gas chamber 420 is sucked into the smoke gas mixing pipe 150 and mixed with the gas, and then is sprayed out from the rear end of the smoke gas mixing pipe 150 into the combustion area. Another part enters the 8 peripheral gas branch pipes two 160 and is sprayed out through the 8 peripheral gas branch pipe two nozzles 170 into the air gas mixing pipe one 180. The front end of the air gas mixing pipe one 180 is communicated with the air chamber 320. The high-speed gas sprayed out through the peripheral gas branch pipe two nozzles 170 generates negative pressure at the front end of the air gas mixing pipe one 180, and the air in the air chamber 320 is sucked into the air gas mixing pipe one 180 and mixed with the gas, and then is sprayed out from the rear end of the air gas mixing pipe one 180 into the combustion area.

[0023] Specifically, the central gas inlet 210 is sequentially connected with the central gas ring pipe 220, the 4 central gas branch pipes 230, the 4 central gas branch pipe nozzles 240, the air gas mixing pipe two inlet 250, the air gas mixing pipe two 260, the air chamber 320 and the air outlet 330.

[0024] The central gas enters the central gas ring pipe 220 through the central gas inlet 210, the 4 central gas branch pipes 230, and then is sprayed out through the central gas branch pipe nozzles 240 and sprayed into the air gas mixing pipe two inlet 250. The high-speed gas sprayed out forms negative pressure at the air gas mixing pipe two inlet 250, and the air in the air chamber 320 is sucked into the air gas mixing pipe two inlet 250 and mixed with the central gas, and then is sprayed out through the air gas mixing pipe two 260 into the combustion area.

[0025] Specifically, the air inlet 310 is sequentially connected with the air chamber 320 and the air outlet 330.

[0026] The combustion air enters the air chamber 320 through the air inlet 310, a part of which is sucked into the air gas mixing pipe one 180 and the air gas mixing pipe two 260 by the peripheral gas and the central gas, mixed with the gas, and then sprayed into the combustion area. The remaining part is sprayed out through the air outlet 330 into the combustion area.

[0027] Specifically, the smoke gas inlet 410 is sequentially connected with the smoke gas chamber 420 and the smoke gas ring cavity 430.

[0028] The flue gas enters the flue gas annular chamber 430 through the flue gas inlet 410, is sucked into the flue gas mixing pipe 150 by the peripheral gas, is mixed with the gas, and is sprayed out from the rear end of the flue gas mixing pipe 150 into the combustion area.

[0029] As a technical optimization scheme of the utility model, the gas spraying speed is adjusted to 150-290 m / s.

[0030] In summary, the utility model discloses a gas induction structure arranged in detail and dispersed, divides the gas induction structure into smaller and more dispersed parts, and respectively induces flue gas and combustion air at different positions, optimizes combustion organization by reducing the induction structure and arranging in a multi-point dispersed manner, homogenizes the reaction zone temperature, and realizes safe and sufficient combustion under natural ventilation conditions while maintaining low NOx emission.

[0031] The natural ventilation combustor with the multi-layer small induction structure refines the gas induction structure of flue gas, makes the structure smaller and more dispersed, reduces the induction structure, arranges in a multi-point dispersed manner, and makes the flue gas weakening reaction more uniform and sufficient, more effectively inhibits local high temperature in the combustion area, and is more conducive to inhibiting the generation of NOx; the gas induction structure of air is refined, makes the structure smaller and more dispersed, reduces the induction structure, arranges in a multi-point dispersed manner, and makes the gas and air mixing more uniform and sufficient, is more conducive to optimizing combustion organization, and makes the flame temperature in the combustion area more uniform; in the outermost induction structure, the gas induction air structure and the gas induction flue gas structure are arranged at intervals, utilize the flue gas weakening reaction, and utilize the gas induction air structure to stabilize the flame, which reduces the reaction temperature and avoids combustion instability that may occur due to the weakening reaction.

[0032] 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 example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0033] It should be noted that the terms "first", "second", and the like, as used in the specification and in the claims, are intended to distinguish between similar objects, but are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the use of the terms so construed can be interchanged, in order to describe the embodiments of the present application, for example, can be implemented in an order other than that illustrated or described herein.

[0034] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A natural draft burner of a multilayer small ejection structure, characterized in that, The application relates to a gas combustion device. The outer layer gas passage (100) comprises an outer layer gas inlet (110), an outer layer gas ring pipe (120), a plurality of peripheral gas branch pipes I (130), a plurality of peripheral gas branch pipe I nozzles (140), a gas and smoke mixing pipe (150), a plurality of peripheral gas branch pipes II (160), a plurality of peripheral gas branch pipe II nozzles (170), a gas and air mixing pipe I (180); the central gas passage (200) comprises a central gas inlet (210), a central gas ring pipe (220), a plurality of central gas branch pipes (230), a plurality of central gas branch pipe nozzles (240), a gas and air mixing pipe II inlet (250), a gas and air mixing pipe II (260); the combustion air passage (300) comprises an air inlet (310), an air chamber (320), an air outlet (330); the backflow smoke passage (400) comprises a smoke inlet (410), a smoke chamber (420), a smoke ring cavity (430); The outer layer gas inlet (110) is sequentially connected with the outer layer gas ring pipe (120), the plurality of peripheral gas branch pipes I (130) and the plurality of peripheral gas branch pipes II (160); the plurality of peripheral gas branch pipes I (130) are connected with the plurality of peripheral gas branch pipe I nozzles (140); the plurality of peripheral gas branch pipes II (160) are connected with the plurality of peripheral gas branch pipe II nozzles (170); the downstream of the peripheral gas branch pipe I nozzle (140) is provided with the gas and smoke mixing pipe (150); the downstream of the peripheral gas branch pipe II nozzle (170) is provided with the gas and air mixing pipe I (180); the central gas inlet (210) is sequentially connected with the central gas ring pipe (220) and the plurality of central gas branch pipes (230); the plurality of central gas branch pipes (230) are connected with the plurality of central gas branch pipe nozzles (240); the downstream of the central gas branch pipe nozzle (240) is provided with the gas and air mixing pipe II inlet (250); the gas and air mixing pipe II inlet (250) is connected with the gas and air mixing pipe II (260); the gas and air mixing pipe II (260) is located inside the air outlet (330); the gas and air mixing pipe II inlet (250) is located inside the air chamber (320) and communicates with the air chamber (320); the air inlet (310) is sequentially connected with the air chamber (320) and the air outlet (330); the smoke inlet (410) is sequentially connected with the smoke chamber (420) and the smoke ring cavity (430). The 16 peripheral gas branch pipes I (130) are connected with the 16 peripheral gas branch pipe I nozzles (140).

2. The multi-layer small-ejection-structure natural draft combustor of claim 1, wherein, The 8 peripheral gas branch pipes II (160) are connected with the 8 peripheral gas branch pipe II nozzles (170).

3. The multi-layer small-ejection-structure natural draft combustor of claim 1, wherein, The 4 central gas branch pipes (230) are connected with the 4 central gas branch pipe nozzles (240).

4. The multi-layer small-ejection natural draft combustor of claim 1, wherein, ​

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