CN217816740U - Full premix combustor and combustion furnace - Google Patents

Abstract

The embodiment of the application provides a full premix combustor and fires burning furnace, relates to the combustor field. The full premix combustor includes: mixing pipe for introducing mixed combustion gas, fan, combustion head and igniter, the combustion head includes gold made of metal hole plateThe metal cylinder is sleeved with the porous silicon carbide ceramic body, the combustion head is installed at an outlet of the fan, the metal cylinder is directly communicated with the fan, and the ignition head of the igniter extends to the position near the outer surface of the porous silicon carbide ceramic body. The full premix burner and the combustion furnace of the embodiment of the application ensure sufficient combustion, improve the combustion efficiency and reduce NO _x Discharging; is not easy to be blocked and burnt out, and has long service life.

Description

Full premix combustor and combustion furnace

Technical Field

The application relates to the field of combustors, in particular to a full premix combustor and a combustion furnace.

Background

The future clean energy of China is mainly natural gas, and the natural gas is cleanCombustion becomes of particular importance, as environmental protection policies are pursued, with respect to NO produced during combustion _x Emission standards are also becoming more stringent and many cities are beginning to implement low nitrogen emission policies for natural gas combustion, and therefore the development of low nitrogen burners is becoming more and more important. As a novel combustion technology, porous medium combustion is increasingly applied to low-nitrogen combustion.

The stainless steel porous medium fully premixed burner commonly used in the market at present is compact in alloy fiber medium material, the air passing aperture is usually 30-1000 microns, the aperture is too small, the burning surface is easy to block and coke in the operation process, the load power of the burner is reduced after long-time operation, the burner needs to be cleaned, and the cleaning is troublesome.

SUMMERY OF THE UTILITY MODEL

An object of this application embodiment is to provide a full premix combustor and burning furnace, guarantee to burn fully, improve combustion efficiency and reduce NO _x Discharging; not easy to be blocked and burned out and long service life.

In a first aspect, an embodiment of the present application provides a fully premixed combustor, including:

the mixing pipeline is used for introducing mixed combustion gas;

the combustion head comprises a metal cylinder made of a metal pore plate and a porous silicon carbide (SIC) ceramic body wrapping and sleeved outside the metal cylinder, the combustion head is arranged at one end part of the mixing pipeline, and the metal cylinder is directly communicated with the mixing pipeline;

and the ignition head of the igniter extends to the vicinity of the outer surface of the porous silicon carbide ceramic body.

In the implementation process, the metal cylinder supported by the metal pore plate is arranged inside the combustion head, and the columnar porous silicon carbide ceramic body is arranged outside the combustion head. The mixed combustion gas is directly introduced into the metal cylinder through the mixing pipeline, enters the porous silicon carbide ceramic body after being rectified by the metal pore plate, and is ignited by the igniter and then is combusted in the silicon carbide pore space. The metal pore plate is uniformly distributed with rectification gas, has the function of a flame arrester, is sleeved on a columnar porous silicon carbide ceramic body outside the metal pore plate for preheating and disturbing flow of combustion gas, and is carbonizedThe flame is divided into small flames for combustion in the silicon medium, thereby ensuring full combustion, improving the combustion efficiency and reducing NO _x Discharging; not easy to be blocked and burned out and long service life.

Therefore, the full premix burner can realize low emission, and the NOx emission is less than 30mg/m ³ Because the combustion is sufficient, basically no carbon monoxide is generated; moreover, the combustion surface provided by the porous silicon carbide ceramic body is more high-temperature resistant than a stainless steel porous material, and the combustion pore diameter is larger than that of a stainless steel premix burner, so that the defects that the alloy fiber premix burner is easy to block and burn out, the power is reduced, the service life is short, frequent cleaning and maintenance are not needed, and the service life is long; in addition, the porous silicon carbide ceramic has an over-enthalpy combustion characteristic, so that low-heat-value gas can be combusted, and the fuel has a wide application range.

In a possible implementation mode, the metal cylinder is made of stainless steel, the thickness of the metal cylinder is 1-5mm, the pore diameter of the metal cylinder is 1-3mm, and the pore area proportion is 15% -30%.

In the above implementation process, the metal cylinder plays the role of rectifying gas and flame arrester.

In one possible implementation, the porous silicon carbide ceramic body has a thickness of 15-40mm, a porosity of 70-90%, and a maximum pore size of not more than 4mm.

In the implementation process, the aperture is larger than that of a stainless steel premixing burner, and the defects that the alloy fiber premixing burner is easy to block and burn out, the power is reduced, and the service life is short can be overcome.

In one possible implementation, the burner further comprises a venturi premixer, wherein the venturi premixer is installed at one end of the mixing pipe far away from the combustion head.

In the implementation process, smooth mixing is ensured to obtain mixed combustion gas.

In a possible implementation, the system further comprises a fan for providing air and a gas pipeline for providing gas, wherein the fan and the gas pipeline are respectively communicated with the venturi premixer.

In the implementation process, air and fuel gas are simultaneously introduced into the Venturi premixer to be mixed.

In a possible implementation, the fan is also equipped with an air filter; the gas pipeline is provided with a gas electromagnetic valve.

In one possible implementation, a swirler is installed within the mixing duct.

In the implementation process, the mixed combustion gas enters the mixing pipeline in a three-dimensional elliptical strong-rotation shearing turbulent motion mode and then smoothly passes through the holes of the metal cylinder.

In one possible implementation, the method further comprises an ion probe, and a probe head of the ion probe extends to the vicinity of the outer surface of the porous silicon carbide ceramic body.

In the implementation process, the combustion condition is detected, and the gas introduction condition is convenient to adjust in time.

In a second aspect, embodiments of the present application provide a combustion furnace including a fully premixed burner as provided in the first aspect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of a fully premixed combustor according to an embodiment of the present disclosure;

fig. 2 is a schematic structural view of fig. 1 from another view angle.

Icon: 1-an air filter; 2-a venturi premixer; 3, a fan; 4-a gas electromagnetic valve; 5-a swirler; 6-an igniter; 7-a mixing pipe; 8-a metal cylinder; 9-porous silicon carbide ceramic body.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally found in use of products of the application, and are used only for convenience in describing the present application and for simplification of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

First embodiment

Referring to fig. 1 and fig. 2, the fully premixed burner provided in this embodiment includes an air filter 1, a venturi premixer 2, a fan 3, a mixing pipe 7, and a burner head, which are sequentially arranged from one end to the other end and are sequentially communicated, the burner head includes a metal tube 8 made of a metal orifice plate and a porous silicon carbide ceramic body 9 wrapping and sleeved outside the metal tube 8, the burner head is installed at one end of the mixing pipe 7, the metal tube 8 is directly communicated with the mixing pipe 7, and the porous silicon carbide ceramic body 9 is made of silicon carbide ceramic, i.e., a medium combustion material; in addition, an igniter 6 is also arranged, the ignition head of the igniter 6 extends to the vicinity of the outer surface of the porous silicon carbide ceramic body 9, and the igniter 6 (English name: igniter) refers to a device which can provide enough energy to ignite pulverized coal and oil (gas) fuel at one moment and can stabilize flame; a gas pipeline for providing gas is also arranged and is communicated with the Venturi premixer 2.

In order to ensure the rectifying combustion effect of the combustion head, under the normal condition, the metal cylinder 8 is made of stainless steel, the thickness is 1-5mm, the aperture is 1-3mm, and the pore area proportion is 15% -30%; the porous silicon carbide ceramic body 9 has a thickness of 15-40mm, a porosity of 70-90%, and a maximum pore diameter of not more than 4mm. In this embodiment, the metal cylinder 8 is made of stainless steel, has a thickness of 3mm, a hole diameter of 2mm, and a hole area ratio of 20%. The porous silicon carbide ceramic body 9 has a thickness of 20mm, a porosity of 80%, and a maximum pore diameter of not more than 4mm.

In order to ensure the ignition effect of the igniter 6, the distance between the ignition head of the igniter 6 and the outer surface of the porous silicon carbide ceramic body 9 is generally controlled to be 8-15cm, and in the present embodiment, the igniter 6 is installed outside the mixing pipe 7, and the ignition head extends to the vicinity of the outer surface of the porous silicon carbide ceramic body 9 by about 10cm.

In this embodiment, the air filter 1 and the venturi premixer 2 are located on one side surface of the fan 3, the mixing pipe 7 and the combustion head are located on the other adjacent side surface of the fan 3, the whole is not arranged in a linear manner, but the fan 3 is used as a turning point to present a bending arrangement manner, communication and work among all parts are not affected, the whole structure is more compact, the space is saved, and all parts can be arranged according to other methods. The mixing duct 7 may also be part of the structure of the fan 3, in particular as an outlet of the fan 3. The mixing pipeline 7 and the combustion head are both cylindrical and are coaxially connected, and the direct communication between the metal cylinder 8 and the mixing pipeline 7 means that the mixing pipeline 7 is directly communicated with an in-cylinder channel of the metal cylinder 8, and the mixing pipeline and the combustion head are coaxially arranged in the same diameter in the embodiment. Each part of the combustor of the embodiment is manufactured respectively and is connected and integrated into a whole by adopting flange bolts, welding and other modes.

In the embodiment, the air filter 1, the venturi premixer 2 and the fan 3 are sequentially communicated, the fan 3 is started, and the outside air is extracted, filtered through the matched air filter 1 and then circulated into the venturi premixer 2; meanwhile, the Venturi premixer 2 is also communicated with a gas pipeline for providing gas, and the air and the gas are mixed into mixed combustion gas in the Venturi premixer 2. Under the effect of fan 3, the mixed combustion gas passes through mixing pipe 7, in the hole entering porous silicon carbide ceramic body 9 through the metal sheet, burns under the ignition effect of ignition ware 6.

In this embodiment, the fan 3 is a variable frequency fan 3.

In order to control the introduction and the flow of the fuel gas, a fuel gas electromagnetic valve 4 is arranged on the fuel gas pipeline.

In order to ensure the mixing effect of the mixed combustion gases and to control the flow path, a swirler 5 is installed in the mixing duct 7. The cyclone 5 usually uses the centrifugal sedimentation principle, and after the mixed gas tangentially enters the cyclone 5 from the periphery of the cyclone 5 under a certain pressure, strong three-dimensional elliptical strong-rotation shearing turbulent flow motion is generated.

In order to try and monitor the combustion condition, an ion probe is also arranged, the probe of the ion probe extends to the position near the outer surface of the porous silicon carbide ceramic body 9, and the ion probe and the igniter 6 can be arranged in parallel or integrated into a whole and then arranged.

The combustion head of the embodiment is of a columnar gun type structure, and is suitable for the hearth structures of most boilers and heating furnaces. The full premix burner is integrated by adopting a variable frequency fan 3, an air filter 1, a Venturi premixer 2 and a high-temperature-resistant porous silicon carbide ceramic body 9, and is provided with an automatic ignition, fire detection and safety control system, so that full-automatic safe operation is realized.

The working process of the full premix burner is as follows: the fan 3 starts, and the air passes through air cleaner 1 and gets into venturi premixer 2 to mix with the gas that lets in wherein, the mixed combustion gas that forms further mixes through swirler 5 in mixing tube 7, then gets into the hole of the metal cylinder 8 of burner head, gets into in the hole of porous carborundum ceramic body 9 after the rectification, and the mixed combustion gas burns in the carborundum pore space after preheating, and the heat that the burning produced can be used to the heating.

In addition, the embodiment of the application provides a combustion furnace, which comprises the fully premixed burner, and mainly comprises a combustion head extending into a hearth of the combustion furnace.

In summary, the fully premixed burner and the combustion furnace of the embodiment of the application ensure sufficient combustion, improve the combustion efficiency and reduce NO _x Discharging; not easy to be blocked and burned out and long service life.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. A fully premixed combustor characterized in that it comprises:

the mixing pipeline is used for introducing mixed combustion gas;

the combustion head comprises a metal cylinder made of a metal pore plate and a porous silicon carbide ceramic body wrapping and sleeved outside the metal cylinder, the combustion head is installed at one end of the mixing pipeline, and the metal cylinder is directly communicated with the mixing pipeline;

an igniter, a firing head of the igniter extending proximate to an outer surface of the porous silicon carbide ceramic body.

2. The full premix burner as in claim 1, wherein the metal cylinder is made of stainless steel, has a thickness of 1-5mm, a hole diameter of 1-3mm, and a hole area ratio of 15% -30%.

3. The fully premixed burner of claim 1, wherein the porous silicon carbide ceramic body has a thickness of 15-40mm, a porosity of 70-90%, and a maximum pore size of not greater than 4mm.

4. The fully premixed combustor of claim 1, further comprising a venturi premixer mounted at an end of the mixing conduit distal from the combustion head.

5. The fully premixed burner of claim 4, further comprising a fan for providing air and a gas conduit for providing gas, the fan and the gas conduit being in communication with the venturi premixer, respectively.

6. The fully premixed burner of claim 5, wherein the fan is further equipped with an air filter; and the gas pipeline is provided with a gas electromagnetic valve.

7. The fully premixed combustor according to claim 1, wherein a swirler is installed within the mixing duct.

8. The fully premixed burner of claim 1, further comprising an ion probe, a tip of the ion probe extending near an outer surface of the porous silicon carbide ceramic body.

9. Combustion furnace, characterized in that it comprises a fully premixed burner according to any of claims 1 to 8.

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