CN114321910A - Low-nitrogen energy-saving combustion device - Google Patents

Abstract

The utility model relates to an industrial burner technical field especially relates to a low nitrogen energy-saving combustion device, including gas inlet, air intlet, gas passageway, mixing passage and mixed export, air intlet with mixed export communicate in mixing passage's both ends, gas intlet communicate in the gas passageway, the gas passageway encircles the setting and is in mixing passage's periphery, mixing passage's cross-section reduces gradually along both ends to the direction at middle part, just mixing passage's middle part encircle be provided with the branch gas pocket of gas passageway intercommunication. The design is simple, the process is simple, and the cost is low; the fuel gas and the air are fully mixed, the combustion efficiency is high, so that the hearth can uniformly bear heat, the emission reduction effect is obvious, the energy consumption is greatly reduced, the economic benefit and the social benefit are obvious, and clean combustion and clean emission are promoted and realized.

Description

Low-nitrogen energy-saving combustion device

Technical Field

The application relates to the technical field of industrial burners, in particular to a low-nitrogen energy-saving combustion device.

Background

Burner (lance, burner, etc.) is a common tool combustion heating device used in industry, and is commonly known as a combustion device used in industrial fuel furnaces, and is understood as a "burner" which is a key combustion device used in industrial fuel furnaces and industrial boilers, and generally refers to a combustion device body part, which is provided with a fuel inlet, an air inlet and an ejection hole, and plays a role in distributing fuel and combustion air and ejecting the fuel and the combustion air in a certain mode for combustion. However, the existing burner has unreasonable air-fuel ratio, insufficient mixing and low combustion efficiency, causes uneven temperature in the furnace, causes the temperature difference of the inner section of the furnace chamber, has high energy consumption and low benefit, has high NOx emission, and can not reach the emission standard regulated by the state. With the rapid development of industrial economy in China, the requirement of environmental protection on the emission of carbon and NOx is higher and higher. The emission requirements for industrial kilns are therefore becoming increasingly stringent.

Disclosure of Invention

For overcoming the problem that exists among the correlation technique at least to a certain extent, the aim at of this application provides a low nitrogen energy-conserving burner, fine solution current combustor air and gas mix poor burning insufficient, the power consumption is high, discharge the high, the inhomogeneous great problem of difference in temperature in the furnace. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the application are described in detail in the following.

The application provides a low nitrogen energy-saving combustion device, including gas inlet, air intlet, gas passageway, mixing passage and mixed export, air intlet with mixed export communicate in mixing passage's both ends, gas intlet communicate in the gas passageway, the gas passageway encircles the setting and is in mixing passage's periphery, mixing passage's cross-section reduces gradually along both ends to the direction at middle part, just mixing passage's middle part encircle be provided with the gas distribution hole of gas passageway intercommunication.

Preferably, the cross section of the gas channel is gradually increased from the two ends to the middle.

Preferably, the mixing channel includes first horn mouth and second horn mouth, first horn mouth with the small-bore end of second horn mouth sets up relatively and communicates through dividing the gas ring, divide the gas pocket to run through the setting and be in divide on the gas ring.

Preferably, the gas channel sleeve is established mixing channel's periphery to through flange structure connection air inlet with mix the export, just mixing channel's tip with gas channel's tip is sealed.

Preferably, the air distribution holes are uniformly and alternately distributed along the circumferential direction of the mixing channel.

Preferably, a honeycomb ceramic catalyst body for catalytic combustion is arranged in the mixing outlet.

Preferably, the honeycomb ceramic catalyst body contains a catalyst which takes CeO2 as a carrier and supports transition metal oxide, cordierite, mullite and pore-forming agent.

Preferably, the honeycomb ceramic catalyst body divides the mixing outlet into a flame guide chamber and a catalyst chamber, and the flame guide chamber and the catalyst chamber are detachably connected.

Preferably, the inner wall of the catalysis chamber is provided with a limiting protrusion and an internal thread, the flame guide chamber is provided with an external thread matched with the internal thread, and the honeycomb ceramic catalysis body is clamped between the flame guide chamber and the limiting protrusion.

Preferably, a first guide pipe and a second guide pipe through which an ignition needle and a detection needle penetrate are arranged in the gas channel, and the end parts of the first guide pipe and the second guide pipe are communicated with the mixing channel.

The technical scheme provided by the application can comprise the following beneficial effects:

when using, the gas enters into the gas passageway by the gas import to fully save in the annular space of gas passageway, combustion-supporting air enters into mixing channel by air intlet, and the gas is by dividing the gas vent to enter into mixing channel in simultaneously, realizes the intensive mixing of air and gas, because form the venturi structure in the mixing channel, can promote the mixing efficiency and the mixed effect of gas and air, promotes combustion efficiency. The arrangement is simple in design, simple in process and low in cost, and the applicable gas types are various industrial kilns, boilers and burners of natural gas, liquefied petroleum gas, propane, butane and other gas fuels; the fuel gas and the air are fully mixed, the combustion efficiency is high, so that the hearth can uniformly bear heat, the emission reduction effect is obvious, the energy consumption is greatly reduced, the economic benefit and the social benefit are obvious, and clean combustion and clean emission are promoted and realized.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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 the drawings without creative efforts.

FIG. 1 is a block diagram of the present low nitrogen energy efficient combustion apparatus shown in accordance with some exemplary embodiments;

FIG. 2 is a block diagram illustrating a mixing channel in accordance with some exemplary embodiments;

FIG. 3 is a block diagram illustrating a first conduit and a second conduit according to some exemplary embodiments;

FIG. 4 is a diagram illustrating a connection configuration of a mixing outlet, according to some exemplary embodiments;

FIG. 5 is an installation configuration diagram of a honeycomb ceramic catalyst body according to some exemplary embodiments.

In the figure: 1. a mixing channel; 2. a gas channel; 3. a gas inlet; 4. an air inlet; 5. a flame guide chamber; 6. a catalyst chamber; 7. a honeycomb ceramic catalyst body; 8. a flange plate; 9. installing a bolt; 10. a limiting bulge; 11. a first bell mouth; 12. a second bell mouth; 13. a gas distribution ring; 14. air distributing holes; 15. a first conduit; 16. a second conduit.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus or methods consistent with aspects of the present application.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below do not limit the contents of the invention described in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.

Referring to fig. 1 to 5, the present embodiment provides a low-nitrogen energy-saving combustion apparatus, which includes a gas inlet 3, an air inlet 4, a gas channel 2, a mixing channel 1 and a mixing outlet, wherein the air inlet 4 and the mixing outlet are communicated with two ends of the mixing channel 1, the air inlet 4 is used for supplying combustion air to the mixing channel 1, and the mixing outlet is used for discharging mixed gas.

Gas channel 2 encircles the periphery that sets up at mixing channel 1, and gas inlet 3 and gas channel 2 intercommunication, gas inlet 3 are used for supplying the gas to enter into gas channel 2 to make the gas can fully save in gas channel 2, be favorable to promoting the mixed combustion efficiency.

The cross-section of mixing channel 1 reduces along both ends to the direction at middle part gradually, and mixing channel 1's middle part is encircleed and is provided with the branch gas vent 14 that communicates with gas channel 2, and at the in-process that the air circulates in mixing channel 1 like this, the contraction section that passes through mixing channel 1 earlier passes through the diffuser segment again to form the venturi structure, be favorable to driving gas entering mixing channel 1 in the gas channel 2, promote mixing rate.

When using, the gas enters into gas passageway 2 by gas inlet 3 to fully save in gas passageway 2's annular space, combustion-supporting air enters into mixing channel 1 by air intlet 4, and the gas enters into mixing channel 1 by minute gas pocket 14 in simultaneously, realizes the intensive mixing of air and gas, because form the venturi structure in mixing channel 1, can promote the mixing efficiency and the mixed effect of gas and air, promotes combustion efficiency.

The arrangement is simple in design, simple in process and low in cost, and the applicable gas types are various industrial kilns, boilers and burners of natural gas, liquefied petroleum gas, propane, butane and other gas fuels; the fuel gas and the air are fully mixed, the combustion efficiency is high, so that the hearth can uniformly bear heat, the emission reduction effect is obvious, the energy consumption is greatly reduced, the economic benefit and the social benefit are obvious, and clean combustion and clean emission are promoted and realized.

In this embodiment, gas channel 2's cross-section is along the direction crescent of both ends to middle part to make gas channel 2 and mixing channel 1's structural shape complementary, when saving occupation space, can concentrate on gas channel 2 and mixing channel 1's middle part region with most gas, be favorable to the gas through gas passing hole 14 entering mixing channel 1, promote mixing efficiency.

Wherein, mixing channel 1 includes first horn mouth 11 and second horn mouth 12, and the small-bore end of first horn mouth 11 and second horn mouth 12 sets up relatively and through dividing the gaseous ring 13 intercommunication, divides gas pocket 14 to run through the setting on dividing gaseous ring 13, will divide gaseous ring 13 to connect first horn mouth 11 and second horn mouth 12 to form the venturi structure, make things convenient for mixing channel 1's pre-assembly, be favorable to processing and maintenance.

Here, gas channel 2 cover is established in mixing channel 1's periphery to through flange structure connection air intlet 4 and mixed export, specifically, the flange structure includes ring flange 8 and construction bolt 9, is favorable to promoting structural stability and leakproofness.

Moreover, the end of the mixing channel 1 is sealed with the end of the gas channel 2, in particular, the end of the mixing channel 1 is provided with an outer edge, namely, the large-caliber ends of the first bell mouth 11 and the second bell mouth 12 are provided with outer edges, and the outer edges are clamped and sealed through a flange structure.

In order to ensure the uniformity of the gas flowing into the mixing channel 1 at all positions in the circumferential direction, the gas distributing holes 14 are uniformly and alternately distributed along the circumferential direction of the mixing channel 1.

In some embodiments, a honeycomb ceramic catalyst body 7 is arranged in the mixing outlet for catalytic combustion of the fuel gas. Specifically, the honeycomb ceramic catalyst body 7 is provided with a micropore geometry such as a micropore circle, a sheet, a hollow sphere, a cone, and the like, so as to facilitate the passage of the mixed gas of gas and air.

Therefore, after being sprayed out through micropores on the honeycomb ceramic catalyst body 7 through the flame guide chamber 5, the mixed gas is ignited on the surface of the honeycomb ceramic catalyst body 7 for catalytic combustion, so that the condition that the catalytic combustion of the gas is realized through the honeycomb ceramic catalyst body 7 is fully met, the heat energy generated in the combustion process of the gas is rapidly diffused to the physical boundaries of the furnace chambers of the kiln and the boiler in an infrared mode, the heat energy conductivity in the furnace chambers is improved, the temperature in the furnace chambers is balanced, and the utilization rate of the gas is improved, so that the release of the combustion heat energy completely reaches the complete combustion; the method realizes effective fuel gas saving, greatly reduces the fuel gas cost, greatly reduces the emission of CO2 and NOx in the tail gas, and achieves the purposes of saving energy and reducing pollution emission.

The honeycomb ceramic catalyst body 7 contains a catalyst which uses CeO2 as a carrier and supports a transition metal oxide, cordierite, mullite and a pore-forming agent. In the preparation process, a catalyst which takes CeO2 as a carrier and is loaded with transition metal oxides is prepared; adding the catalyst into the slurry solution, uniformly stirring, roasting, and grinding to obtain catalyst powder; grinding cordierite and mullite, adding a pore-forming agent and the added catalyst powder, and uniformly mixing and stirring to obtain mixed powder; finally, the mixed powder is put into a die to be made into a body required by the porous honeycomb ceramic, and the body is roasted to obtain the honeycomb ceramic catalyst body 7.

Therefore, the honeycomb ceramic catalyst body 7 overcomes the defects that the required temperature for direct flame combustion is high, the energy utilization rate is low, N2 and O2 can generate polluting gases such as NOx at high temperature, the methane ignition temperature is reduced, methane and CO compounds at low temperature have good catalytic oxidation capacity, the methane and CO compounds are converted into CO2 and H2O, and meanwhile, the honeycomb ceramic catalyst body also has good low-temperature oxidation combustion and reduction capacity on NO, so that the methane and CO compounds are converted into NO2, and the honeycomb ceramic catalyst body is a functional rare earth-based methane combustion catalyst body with good low-temperature catalytic combustion performance.

The catalytic combustion of the fuel gas is a technology of performing flameless combustion at a low ignition temperature, for example, 360 to 450 ℃, by using a catalyst, and oxidizing and decomposing organic waste gas into carbon dioxide and water. The essence of catalytic combustion is a vigorous oxidation reaction in which active oxygen participates, and the active components of the catalyst activate oxygen in the air and then transfer energy when the active components contact with reactant molecules, so that the reactant molecules are activated, and the oxidation reaction is accelerated. The lower activation energy of the catalytic combustion reaction can occur at lean hydrocarbon concentrations, so the adiabatic reaction temperature is below the limit of NOx formation, and is fully oxidized, forming no CO and incompletely combusted hydrocarbons, and the combustion occurs outside the conventional gas phase flammability limit, so the combustion is more stable.

The honeycomb ceramic catalyst body 7 formed by the catalyst of rare earth Ce 02-based supported transition metal oxide is mainly applied to catalytic combustion of natural gas, and can be used for catalytic combustion of industrial kilns, high-temperature burners of boilers, civil low-temperature natural gas stoves, burners and the like. Flame is fully combusted and oxidized on the surface of the honeycomb ceramic catalyst body 7, so that the gas phase reaction of natural gas and catalyst components contained in the honeycomb ceramic catalyst body 7 is accelerated, the phenomena of local temperature rise and heat radiation enhancement are generated, the heat energy conductivity in a hearth is improved, the temperature inside the hearth is balanced, the gas utilization rate is improved, the release of combustion heat energy reaches complete combustion, the gas is effectively saved, the gas cost is greatly reduced, meanwhile, the emission of CO2 and NOx in tail gas is also effectively reduced, the emission pollution is reduced by low-nitrogen combustion, and the problems of low heat energy utilization rate of flame combustion, easy pollution generation and the like are effectively solved.

In some preferred embodiments, the ceramic honeycomb catalyst 7 is disposed at a middle position of the mixing outlet and divides the mixing outlet into the flame guide chamber 5 and the catalyst chamber 6, and the flame guide chamber 5 and the catalyst chamber 6 are detachably connected to facilitate the mounting and dismounting of the ceramic honeycomb catalyst 7.

Wherein the gas and air mixed in the mixing channel 1 flow into the flame guide chamber 5 to be mixed again, thereby further improving the mixing degree.

Specifically, the inner wall of the catalytic chamber 6 is provided with a limiting protrusion 10 and an internal thread, the flame guide chamber 5 is provided with an external thread matched with the internal thread, and the honeycomb ceramic catalytic body 7 is clamped between the flame guide chamber 5 and the limiting protrusion 10. During installation, the honeycomb ceramic catalyst body 7 is embedded into the catalyst chamber 6, the position is limited by the limiting protrusions 10, the flame guide chamber 5 is screwed into the catalyst chamber 6, the end part of the flame guide chamber 5 and the limiting protrusions 10 gradually clamp the honeycomb ceramic catalyst body 7, and the honeycomb ceramic catalyst body 7 is fixed.

In order to facilitate installation of the ignition needle and the detection needle, a first guide pipe 15 and a second guide pipe 16 through which the ignition needle and the detection needle penetrate are arranged in the gas channel 2, the end parts of the first guide pipe 15 and the second guide pipe 16 are communicated with the mixing channel 1, and the ignition needle and the detection needle penetrate through the first guide pipe 15 and the second guide pipe 16 respectively.

This example is illustrated by the following table.

It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like as used herein, are intended to indicate an orientation or positional relationship relative to that shown in the drawings, but are merely used to facilitate the description of the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description herein, it is also noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments. The multiple schemes provided by the application comprise basic schemes of the schemes, are independent of each other and are not restricted to each other, but can be combined with each other under the condition of no conflict, so that multiple effects are achieved together.

While embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present application, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. The utility model provides a low nitrogen energy-saving combustion device, its characterized in that, including gas inlet (3), air intlet (4), gas passageway (2), mixing channel (1) and mixed export, air intlet (4) with mixed export communicate in the both ends of mixing channel (1), gas inlet (3) communicate in gas passageway (2), gas passageway (2) encircle to set up the periphery of mixing channel (1), the cross-section of mixing channel (1) reduces to the direction at middle part along both ends gradually, just the middle part of mixing channel (1) encircle be provided with gas distribution hole (14) of gas passageway (2) intercommunication.

2. The low-nitrogen energy-saving combustion device according to claim 1, wherein the cross section of the gas channel (2) is gradually increased in the direction from both ends to the middle.

3. The low-nitrogen energy-saving combustion device according to claim 2, wherein the mixing channel (1) comprises a first bell mouth (11) and a second bell mouth (12), the small-caliber ends of the first bell mouth (11) and the second bell mouth (12) are oppositely arranged and communicated through a gas distribution ring (13), and the gas distribution holes (14) are penetratingly arranged on the gas distribution ring (13).

4. The low-nitrogen energy-saving combustion device according to claim 3, wherein the gas channel (2) is sleeved on the periphery of the mixing channel (1) and is connected with the air inlet (4) and the mixing outlet through a flange structure, and the end of the mixing channel (1) is sealed with the end of the gas channel (2).

5. The low-nitrogen energy-saving combustion device according to claim 1, wherein the gas distribution holes (14) are uniformly and spaced along the circumferential direction of the mixing channel (1).

6. The low-nitrogen energy-saving combustion device according to claim 1, wherein a honeycomb ceramic catalyst body (7) for catalytic combustion is provided in the mixing outlet.

7. The low-nitrogen energy-saving combustion device according to claim 6, wherein the honeycomb ceramic catalyst body (7) contains a catalyst supported on CeO2 and supporting a transition metal oxide, cordierite, mullite and a pore-forming agent.

8. The low-nitrogen energy-saving combustion device according to claim 6, wherein the honeycomb ceramic catalyst body (7) divides the mixing outlet into a flame guide chamber (5) and a catalyst chamber (6), and the flame guide chamber (5) and the catalyst chamber (6) are detachably connected.

9. The low-nitrogen energy-saving combustion device according to claim 8, wherein the inner wall of the catalytic chamber (6) is provided with a limiting bulge (10) and an internal thread, the flame guide chamber (5) is provided with an external thread matched with the internal thread, and the honeycomb ceramic catalytic body (7) is clamped between the flame guide chamber (5) and the limiting bulge (10).

10. The low-nitrogen energy-saving combustion device according to claim 1, wherein a first conduit (15) and a second conduit (16) for an ignition needle and a detection needle to penetrate are arranged in the gas channel (2), and the ends of the first conduit (15) and the second conduit (16) are communicated with the mixing channel (1).

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