Double-low-emission flat flame super-adiabatic burner

Abstract

The utility model discloses a double-low-emission flat flame super-adiabatic combustor which comprises an adjustment execution module and a control module and further comprises a flat flame combustor module and a second-stage super-adiabatic combustion reaction disc module. The flat flame burner module comprises a burner shell, a first-stage super-adiabatic combustion reaction disc, a first-stage fuel pipe set, a second-stage fuel pipe set and an ignition rod, the burner shell penetrates through and is fixedly connected to the hearth wall, the first-stage super-adiabatic combustion reaction disc is fixed to the upper end of the burner shell, and the second-stage fuel pipe set is fixed to the lower end of the burner shell; the gas injection end of the first-stage fuel pipe set is located on the inner side of the first-stage super-adiabatic combustion reaction disc, the gas injection end of the second-stage fuel pipe set surrounds the periphery of the first-stage super-adiabatic combustion reaction disc, and the pressure and flow of the first-stage fuel pipe set and the second-stage fuel pipe set are adjusted through an adjusting execution module and a control module; the second-stage super-adiabatic combustion reaction disc module comprises a second-stage super-adiabatic combustion reaction disc, an adjustable fireproof supporting rod, a connecting screw and a fastening nut.

Description

Technical Field

[0001] The utility model relates to the field of burners, in particular to a double low-emission flat flame super-adiabatic burner. Background Art

[0002] Adiabatic combustion is an idealized combustion, in which the flame formed by combustion never transfers heat to the external environment or other surrounding objects. Since there is no heat transfer or heat dissipation loss, the heat of combustion released by the fuel during adiabatic combustion can be used to heat the combustion products themselves, raising their temperature to a temperature that cannot be reached by general combustion. This is not only conducive to the complete combustion of the fuel and significantly improves the combustion efficiency, but also creates good thermodynamic conditions for the full utilization of the heat of combustion. Superadiabatic combustion refers to the use of enhanced radiation or heat storage methods during the combustion process to use the heat as much as possible to heat the materials and the fuel and oxidant upstream of the reaction area, thereby reducing the heat in the flue gas and enhancing the combustion reaction.

[0003] At present, the combustion systems in the petrochemical industry, metallurgy, building materials and other industries mostly use traditional combustion technology, which is characterized by free flames. Their combustion will inevitably have disadvantages such as uneven temperature distribution, narrow combustion area, and serious pollutant emissions, which are attributed to the poor thermal conductivity and radiation properties of the gas.

[0004] Traditional burners and combustion systems have the problem of high pollutant emissions, low thermal efficiency of burners, and high NOx content in flue gas, some as high as 170ppm. The general generation mechanism of NOx generated in boilers is thermal, and high temperature and excess air coefficient affect NOx generation in a complex way. Reducing local intense combustion and avoiding the existence of high-temperature areas as much as possible are ways to reduce the generation of NOx during combustion. The low NOx burners and ultra-low nitrogen oxide burners currently used can reduce the outlet NOx content to 50mg / m3, but there are also many heating furnaces with low furnace temperatures, or they are designed for external mixing combustion, resulting in outlet COe content greater than 50mg / m3, and there are outlet Coe content greater than 500mg / m3. This situation will cause heat loss and waste, which is not in line with the concept of energy saving and environmental protection.

[0005] In a free flame, the residual CO is also difficult to control. Whether the combustion is sufficient affects whether the CO is burned out, and also affects the overall thermal efficiency of the burner.

[0006] The thermal conductivity and radiation properties of gas are poor. After the fuel is burned, part of the heat will be carried out of the furnace by the flue gas. Although traditional combustion technology considers the use of flue gas waste heat, which is used to preheat fuel or oxides through heat exchangers, the heat exchange efficiency of the more efficient rotary heat exchanger in the industry is still around 70%. In response to this problem, in the absence of a better way to improve the utilization rate of flue gas, lowering the flue gas temperature is a good solution.

[0007] In summary, the development of a dual low-emission flat flame superadiabatic burner can solve the above problems. Utility Model Content

[0008] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a double low emission flat flame super adiabatic burner. In order to solve the above technical problems, the utility model provides the following technical solutions:

[0009] The utility model discloses a double low-emission flat flame super-adiabatic burner, comprising an adjustment execution module and a control module, and also comprising a flat flame burner module and a second-stage super-adiabatic combustion reaction disk module;

[0010] The flat flame burner module comprises: a burner shell, a first-stage super-insulation combustion reaction disk, and a first-stage fuel pipe group, a second-stage fuel pipe group and an ignition rod fixed in the burner shell, the burner shell penetrates and is fixedly connected to the furnace wall, and the outer peripheral wall of the burner shell located on the upper side of the furnace wall is wrapped with a furnace refractory material, and the lower end of the side wall of the burner shell is provided with an inlet for an oxidant, the first-stage super-insulation combustion reaction disk is fixed to the upper end of the burner shell, the jet end of the first-stage fuel pipe group is located on the inner side of the first-stage super-insulation combustion reaction disk, and the jet end of the second-stage fuel pipe group is surrounded by the outer periphery of the first-stage super-insulation combustion reaction disk, and the first-stage fuel pipe group and the second-stage fuel pipe group are both regulated by the regulating execution module and the control module to regulate the pressure and flow of the two-stage fuel groups;

[0011] The second-stage super-adiabatic combustion reaction disk module includes: a second-stage super-adiabatic combustion reaction disk, an adjustable refractory support rod, connecting screws and fixing nuts. The upper end of the adjustable refractory support rod is fixedly connected to the second-stage super-adiabatic combustion reaction disk by a connecting screw, and the lower end is fixedly connected to the furnace wall by a fixing nut. The second-stage super-adiabatic combustion reaction disk is located directly above the first-stage super-adiabatic combustion reaction disk.

[0012] Preferably, the first-stage superadiabatic combustion reaction disk is a hollow cube with a certain taper at its upper portion, the fluid cross-sectional area gradually decreases with increasing height, and has a certain pore structure at its upper portion.

[0013] Preferably, the first-stage super-insulation combustion reaction disk and the second-stage super-insulation combustion reaction disk are porous ceramics or entities with porous structures with silicon carbide, silicon nitride, mullite, cordierite, aluminum titanate, alumina, diatomaceous earth, zircon, and magnesite as matrix materials.

[0014] Preferably, the number of nozzles in the primary fuel pipe group and the secondary fuel pipe group can be single or multiple.

[0015] Preferably, the second-stage superadiabatic combustion reaction disk is a flat square column structure with a thickness in the range of 20 mm to 200 mm.

[0016] Preferably, when the second-stage superadiabatic combustion reaction disk is a solid structure, its cross-sectional structure is one of a straight hole structure, a tapered hole structure, a Venturi hole structure, and a stepped through hole structure.

[0017] Preferably, when the second-stage super-adiabatic combustion reaction disk is a porous ceramic, its structure is one of a high-alumina ceramic ball structure and a silicon carbide porous ceramic structure.

[0018] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0019] 1) The super-adiabatic combustion reaction disk has the characteristics of high thermal conductivity and high specific surface area. When the flame burns on the second-stage super-adiabatic combustion reaction disk, the second-stage super-adiabatic combustion reaction disk can absorb more heat. The heat capacity of the second-stage super-adiabatic combustion reaction disk is much larger than the heat capacity of the same volume of gas. The second-stage super-adiabatic combustion reaction disk replaces the free space, and the combustion heat can be quickly conducted to the second-stage super-adiabatic combustion reaction disk, and part of the heat is stored in the second-stage super-adiabatic combustion reaction disk, and part of the heat is radiated and conducted to the adjacent solid medium. Part of the heat stored in the second-stage super-adiabatic combustion reaction disk will begin to heat the premixed gas or separated fuel and oxide downstream of the reaction zone on the lower surface of the second-stage super-adiabatic combustion reaction disk. The proportion of heat released by combustion that is carried out by flue gas is reduced, and more heat is fully used to enhance the combustion reaction, so that the thermal efficiency of the burner is significantly increased.

[0020] 2) The super-adiabatic combustion reaction disk can significantly enhance the diffusion and heat transfer process in the gas by disturbing the airflow. The heat released by the fuel efficiently enters the super-adiabatic combustion reaction disk, so the temperature peak of the reaction zone and the temperature of the products after the reaction are significantly reduced. At the same time, the high emissivity coexisting with the high thermal conductivity makes the temperature in the combustion chamber tend to be uniform, avoiding the formation of local high-temperature areas, and can significantly reduce NOx emissions. The NOx emissions of this burner are less than 20ppm.

[0021] 3) Because the reaction zone is large, the reaction time is longer, and the combustion is more sufficient and complete, it is beneficial to inhibit the formation of CO.

[0022] 4) A second-stage super-adiabatic combustion reaction disk can be added to the original burner to achieve technical upgrading and transformation of the original burner, which has the advantages of low transformation cost, short shutdown and transformation time, and significant emission reduction effect after transformation.

[0023] 5) The burner has a wide power adjustment range and can achieve high-intensity combustion. Since the temperature of the second-stage super-adiabatic combustion reaction disk is higher than the combustion temperature of the mixed gas, the power density can be increased by increasing the flow rate of the mixed gas.

[0024] 6) Traditional boilers need to have enough space to accommodate free flames. This technology concentrates the combustion range to the second-stage super-adiabatic combustion reaction disk, which can reduce the size of the boiler.

[0025] 7) The super-insulating combustion reaction disk is a porous ceramic formed or made of silicon carbide, which has the advantages of high thermal conductivity, thermal shock resistance, light weight, high strength, excellent thermal shock resistance and excellent processing performance, and can withstand the thermal stress caused by frequent startup and temperature gradient.

[0026] 8) The height of the second-stage super-adiabatic combustion reaction disk from the fuel nozzle is adjustable, and the height can be freely adjusted at the construction site, or subsequently adjusted according to the aging of the burner. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 This is a general schematic diagram of a double low emission flat flame super adiabatic burner of the utility model;

[0029] Figure 2 This is a side view of a double low emission flat flame super adiabatic burner of the utility model;

[0030] Figure 3 This is a partial enlarged view of the height adjustment thread of the second-stage superadiabatic combustion reaction disk module;

[0031] Figure 4 is a top view of the burner body in the system;

[0032] Figure 5 It is a top view of the second stage superadiabatic combustion reaction disk;

[0033] Figure 6 It is a schematic diagram of fuel and combustion aid supply;

[0034] Figure 7-12 Design structural details for the second-stage superadiabatic combustion reaction disk;

[0035] Figure 13-15 This is a detailed diagram of the pore structure on the upper part of the first-stage superadiabatic combustion reaction disk;

[0036] Among them, 1. Second-stage super-adiabatic combustion reaction disk; 2. Connecting screws; 3. Adjustable refractory support rods; 4. First-stage super-adiabatic combustion reaction disk; 5. First-stage fuel pipe group; 6. Second-stage fuel pipe group; 7. Burner shell; 8. Refractory material in the furnace; 9. Locking nut; 10. Furnace wall; 11. Ignition rod; 12. Adjustment execution module; 13. Control module. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0038] like Figures 1 to 15 As shown, a dual low-emission flat flame super-adiabatic burner includes a regulation execution module 12 and a control module 13, and also includes a flat flame burner module and a second-stage super-adiabatic combustion reaction disk module;

[0039] The flat flame burner module includes: a burner shell 7, a first-stage super-insulation combustion reaction disk 4, and a first-stage fuel pipe group 5, a second-stage fuel pipe group 6 and an ignition rod 11 fixed in the burner shell 7. The burner shell 7 penetrates and is fixedly connected to the furnace wall 10, and the outer peripheral wall of the burner shell 7 located on the upper side of the furnace wall 10 is wrapped with a furnace refractory material 8, and the lower end of the side wall of the burner shell 7 is provided with an inlet for an oxidant. The first-stage super-insulation combustion reaction disk 4 is fixed to the upper end of the burner shell 7, the jet end of the first-stage fuel pipe group 5 is located on the inner side of the first-stage super-insulation combustion reaction disk 4, and the jet end of the second-stage fuel pipe group 6 is surrounded by the outer periphery of the first-stage super-insulation combustion reaction disk 4. The first-stage fuel pipe group 5 and the second-stage fuel pipe group 6 are both regulated by the regulating execution module 12 and the control module 13 to regulate the pressure and flow of the two-stage fuel groups;

[0040] The second-stage super-adiabatic combustion reaction disk module includes: a second-stage super-adiabatic combustion reaction disk 1, an adjustable refractory support rod 3, a connecting screw 2 and a locking nut 9. The upper end of the adjustable refractory support rod 3 is fixedly connected to the second-stage super-adiabatic combustion reaction disk 1 by the connecting screw 2, and the lower end is fixedly connected to the furnace wall 10 by the locking nut 9. The second-stage super-adiabatic combustion reaction disk 1 is located directly above the first-stage super-adiabatic combustion reaction disk 4.

[0041] The burner fuel and oxidant will be accurately proportioned by the regulating execution module 12 and the control module 13, and mixed in the cavity and outlet of the burner shell 7. The burner cooperates with the second-stage super-adiabatic combustion reaction disk 1 to concentrate the combustion reaction around the second-stage super-adiabatic combustion reaction disk 1.

[0042] A flat cylindrical heat storage body with a large specific surface area, the second-stage super-adiabatic combustion reaction disk, is used. Taking advantage of its many pores and high thermal conductivity, when the flame burns on the second-stage super-adiabatic combustion reaction disk 1, the second-stage super-adiabatic combustion reaction disk 1 can absorb heat. This part of the heat is used to heat the premixed gas or the separated fuel and oxide downstream of the second-stage super-adiabatic combustion reaction 1. When external heat loss is ignored, the flame temperature can exceed the adiabatic flame temperature corresponding to the mixed gas that has not been preheated. Storing heat in the second-stage super-adiabatic combustion reaction disk 1 will allow more heat to be used to enhance the combustion reaction, which will significantly increase the thermal efficiency of the burner.

[0043] The first-stage super-adiabatic combustion reaction disk 4 can disturb the airflow through the pore structure, so that the heat released by the fuel can efficiently enter the second-stage super-adiabatic combustion reaction disk 2. Therefore, the temperature peak of the reaction zone and the temperature of the products after the reaction will be significantly reduced. At the same time, the high emissivity coexisting with the high thermal conductivity makes the temperature in the combustion chamber tend to be uniform, avoiding the formation of local high-temperature areas, and can significantly reduce NOx emissions, achieving the design goal of energy saving and environmental protection.

[0044] The principle and advantages of this utility model: The installation and debugging method of this double low emission flat flame super adiabatic burner is as follows:

[0045] The burner is installed as follows: the burner housing 7 is fixedly connected to the furnace wall 10, the second-stage super-insulation combustion reaction disk 1 is connected to the adjustable refractory support rod 3, and the adjustable refractory support rod 3 is connected to the furnace wall 10 by a fixing nut 9. After the second-stage super-insulation combustion reaction disk 1 is adjusted to a preset height, the second-stage super-insulation combustion reaction disk 1 is fastened to the adjustable refractory support rod 3 by a connecting screw 2, and finally the fixing nut 9 is fastened to complete the main body installation. The second-stage super-insulation combustion reaction disk 1 is prefabricated with a section of thread at the bottom of the adjustable refractory support rod 3 as a height margin for adjusting relative to the furnace wall 10.

[0046] By setting up the second-stage super-adiabatic combustion reaction disk 1, the combustion reaction of the burner is concentrated around the second-stage super-adiabatic combustion reaction disk 1. Different from the traditional burner with a long straight flame, the combustion reaction area of ​​the burner is small, and the height of the second-stage super-adiabatic combustion reaction 1 from the burner shell 7 can be adjusted to find the optimal combustion height, keep the flame disk temperature at 1200-1300 degrees, and inhibit the production of nitrogen oxides.

[0047] The oxygen supply is divided into two levels, namely, the primary fuel pipe group 5 and the secondary fuel pipe group 6, and the number of nozzles in each pipe group can be single or multiple. The primary fuel supply and the secondary fuel supply are in a specific ratio, namely, 20%-30% for the primary fuel supply and 70%-80% for the secondary fuel supply.

[0048] The fuel configuration module regulates the pressure and flow of both the primary fuel group and the secondary fuel group of the flat flame burner module.

[0049] The flat flame burner module can form a specific jet with the adjusted fuel and oxidant, and can preliminarily mix the gas. The ignition rod 11 can enhance the combustion effect at the beginning of combustion and when the combustion is unstable.

[0050] The first-stage super-insulation combustion reaction disk 4 and the second-stage super-insulation combustion reaction disk (1) are porous ceramics or entities with porous structures with silicon carbide, silicon nitride, mullite, cordierite, aluminum titanate, alumina, diatomaceous earth, zircon, and magnesite as matrix materials, and have excellent thermal conductivity, light weight, thermal shock resistance, and high temperature resistance. When the second-stage super-insulation combustion reaction disk 1 is a solid structure, its cross-sectional structure is one of a straight hole structure, a tapered hole structure, a Venturi hole structure, and a stepped through hole structure. When the second-stage super-insulation combustion reaction disk 1 is a porous ceramic, its structure is one of a high-aluminum ceramic ball structure and a silicon carbide porous ceramic structure.

[0051] The second-stage super-adiabatic combustion reaction disk 1 is a cube with a relatively high specific surface area. It has excellent thermal conductivity, light weight, thermal shock resistance, and high temperature resistance. Its relatively high specific surface area can be provided by the porosity of the porous medium, or it can be formed by mechanical processing of the material to form a structure penetrating the upper and lower surfaces. The cylinder can be mechanically processed to form a through hole, a tapered hole, or a stepped hole in the axial direction.

[0052] The first-stage superadiabatic combustion reaction disk 4 is a hollow cube with a certain taper at the top. The cross-sectional area of ​​the fluid gradually decreases with the increase of height, and it has a certain pore structure at the top, which can guide the internal fluid to the outside of the cube according to a specific rule. The first-stage superadiabatic combustion reaction disk 4 and the second-stage superadiabatic combustion reaction disk 1 can quickly absorb heat and heat the surrounding gas through radiation.

[0053] The burner can increase the thermal efficiency of the burner to more than 99% and effectively reduce the energy overflowed from the flue gas through the regulating effect of the first-stage super-adiabatic combustion reaction disk 4 and the second-stage super-adiabatic combustion reaction disk 1 on combustion, and has the characteristics of high efficiency and energy saving. The COe content of the flue gas at the burner outlet can be significantly reduced to 0-5ppm, and the NOx content can be significantly reduced to 0-10ppm, and the emissions are cleaner.

[0054] Superadiabatic combustion refers to the use of enhanced radiation or heat storage methods during the combustion process to maximize the use of heat for heating materials and for heating the fuel and oxidant upstream of the reaction area, thereby reducing the heat in the flue gas and enhancing the combustion reaction.

[0055] COe refers to CO and unburned combustibles, such as CH4, H2 and other components. This indicator is one of the conditions for evaluating complete combustion.

[0056] Double low refers to ultra-low nitrogen oxides and ultra-low COe emissions during the operation of the burner.

[0057] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A dual low emission flat flame super adiabatic burner, comprising a regulation execution module (12) and a control module (13), characterized in that: Also included are a flat flame burner module and a second-stage superadiabatic combustion reaction disk module; The flat flame burner module comprises: a burner shell (7), a first-stage super-insulating combustion reaction disk (4), and a first-stage fuel pipe group (5), a second-stage fuel pipe group (6) and an ignition rod (11) fixed in the burner shell (7); the burner shell (7) penetrates and is fixedly connected to a furnace wall (10); and the outer peripheral wall of the burner shell (7) located on the upper side of the furnace wall (10) is wrapped with a furnace refractory material (8); and the lower end of the side wall of the burner shell (7) is provided with a combustion-supporting The first-stage super-adiabatic combustion reaction disk (4) is fixed to the upper end of the burner shell (7), the jet end of the first-stage fuel pipe group (5) is located inside the first-stage super-adiabatic combustion reaction disk (4), the jet end of the second-stage fuel pipe group (6) surrounds the outer periphery of the first-stage super-adiabatic combustion reaction disk (4), and the first-stage fuel pipe group (5) and the second-stage fuel pipe group (6) are both regulated by a regulation execution module (12) and a control module (13) to regulate the pressure and flow of the two-stage fuel groups; The second-stage super-adiabatic combustion reaction disk module comprises: a second-stage super-adiabatic combustion reaction disk (1), an adjustable refractory support rod (3), a connecting screw (2) and a fixing nut (9), wherein the upper end of the adjustable refractory support rod (3) is fixedly connected to the second-stage super-adiabatic combustion reaction disk (1) via the connecting screw (2), and the lower end of the adjustable refractory support rod (3) is fixedly connected to the furnace wall (10) via the fixing nut (9), and the second-stage super-adiabatic combustion reaction disk (1) is located directly above the first-stage super-adiabatic combustion reaction disk (4).

2. The dual low emission flat flame super adiabatic burner according to claim 1, characterized in that: The first-stage superadiabatic combustion reaction disk (4) is a hollow cube with a certain taper at its upper portion, the fluid cross-sectional area gradually decreases with increasing height, and has a certain pore structure at its upper portion.

3. The dual low emission flat flame super adiabatic burner according to claim 1, characterized in that: The first-stage super-adiabatic combustion reaction disk (4) and the second-stage super-adiabatic combustion reaction disk (1) are porous ceramics or entities with a porous structure.

4. The dual low emission flat flame super adiabatic burner according to claim 1, characterized in that: The number of nozzles in the primary fuel pipe group (5) and the secondary fuel pipe group (6) is single or multiple.

5. The dual low emission flat flame super adiabatic burner according to claim 3, characterized in that: The second-stage superadiabatic combustion reaction disk (1) is a flat square columnar structure, and its thickness is in the range of 20 mm to 200 mm.

6. The dual low emission flat flame super adiabatic burner according to claim 5, characterized in that: When the second-stage superadiabatic combustion reaction disk (1) is a solid structure, its cross-sectional structure is one of a straight hole structure, a tapered hole structure, a Venturi hole structure, and a stepped through hole structure.

7. The dual low emission flat flame super adiabatic burner according to claim 5, characterized in that: When the second-stage super-adiabatic combustion reaction disk (1) is a porous ceramic, its structure is one of a high-alumina ceramic ball structure and a silicon carbide porous ceramic structure.

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