Injection type low-nitrogen burner

Abstract

According to the injection type low-nitrogen combustor, a hearth plate is arranged on hearth castable, a combustor shell is arranged on the hearth plate, a primary fuel assembly and an ignition assembly which extend into the combustor shell are arranged in the center of the combustor shell, and a secondary fuel assembly is arranged on the lower portion of the combustor shell; one end of the second-stage fuel assembly penetrates through the hearth pouring material to extend into the hearth, the other end of the second-stage fuel assembly penetrates through the upper portion of the combustor shell to extend outwards, a flame monitor is arranged on the outer wall of the combustor shell and penetrates through the combustor shell and the hearth pouring material, and a flame detection assembly is arranged on a first-stage mounting flange of the first-stage fuel assembly; by arranging the first-stage ejection gap and the second-stage ejection gap, high-speed flowing combustion-supporting air or second-stage fuel is used for guiding flue gas in the furnace to flow back from the first-stage ejection gap and the second-stage ejection gap, so that the flue gas in the furnace participates in secondary combustion, the flame temperature is reduced, and the generation of thermal nitrogen oxides is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of burners, and in particular relates to an induced-type low-nitrogen burner. Background Art

[0002] With the increasing attention paid to environmental protection around the world and the increasingly stringent restrictions on nitrogen oxide emissions in relevant environmental regulations, low nitrogen emission technology for combustion equipment has become a key area of ​​research and development. As a key equipment widely used in many fields such as industrial boilers, furnaces, kilns and civil heating, the performance of burners directly affects energy utilization efficiency and pollutant emission levels. In the combustion process of traditional burners, due to the unreasonable mixing method of air and gas and the unreasonable combustion organization form, incomplete combustion is often caused, which not only causes energy waste, but also produces a large amount of pollutants such as nitrogen oxides (NOx). Among them, thermal NOx is generated by the reaction of nitrogen and oxygen in the air at high temperature, and its generation is closely related to the combustion temperature, the residence time in the high temperature zone and the oxygen concentration. In order to reduce NOx emissions, early burners mainly adopted simple staged combustion technology, gas staged, and air staged. That is, by controlling the supply of fuel and air during the combustion process, a fuel-rich zone and a fuel-lean zone are formed, trying to reduce the temperature of the high temperature zone and thus reduce the generation of thermal NOx. However, this method has limited effect on NOx emission reduction and is difficult to meet the increasingly stringent environmental standards. In recent years, induced combustion technology has gradually attracted attention. The induced burner uses the pressure of the gas itself to induced flue gas, achieves the mixing of flue gas and gas, thereby reducing the combustion temperature and reducing the generation of thermal NOx. However, the existing induced burners still have many shortcomings in low nitrogen combustion performance. For example, when the fuel gas flow rate is small or the fuel gas pressure is low, the amount of induced flue gas is small, and the flame temperature cannot be well reduced to inhibit the generation of thermal NOx. Reference patent: Chinese patent CN 214840801U, adopts an outer ring cavity gas injection, and forms a flue gas induced structure, and the peripheral gas and air are partially mixed. This structure is conducive to reducing NOx, but the gas grading ability is relatively weak, the flame is concentrated in the middle, and it is easy to produce a high temperature area, resulting in an increase in NOx. Therefore, there is still a need for a more reasonable and effective low NOx burner structure with grading and flue gas internal circulation combustion to organize combustion and control pollutant emissions.

[0003] The air and gas injection type low nitrogen burner of the present invention is proposed based on solving the above-mentioned problems in the prior art. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an induced-type low-nitrogen burner with a reasonable design, which effectively avoids the generation of high-temperature zones and increases the amount of smoke induced to reduce the generation of nitrogen oxides.

[0005] The technical solution adopted to solve the above technical problems is: an induced-type low-nitrogen burner, a furnace plate is arranged on the furnace castable, a burner shell is arranged on the furnace plate, a first-level fuel assembly and an ignition assembly extending into the burner shell are arranged at the center of the burner shell, a second-level fuel assembly is arranged at the lower part of the burner shell, one end of the second-level fuel assembly passes through the furnace castable and extends into the furnace, and the other end extends outward through the upper part of the burner shell, a flame monitor is arranged on the outer wall of the burner shell through the burner shell and the furnace castable, and a fire detection assembly is arranged on the first-level mounting flange of the first-level fuel assembly.

[0006] The secondary fuel assembly of the present invention is as follows: an air intake flange is arranged at the upper end of a secondary air intake pipe, a secondary mounting flange and a secondary pressure taking pipe are arranged at the upper part, the secondary mounting flange is arranged on a burner shell, the secondary pressure taking pipe is located at the upper part of the secondary mounting flange, an atomizing nozzle connecting pipe is arranged on the secondary mounting flange, the lower end of the secondary air intake pipe is communicated with a secondary air intake ring pipe, the secondary air intake ring pipe is arranged concentrically and circumferentially with the primary fuel assembly, a plurality of groups of secondary air intake branch pipes are arranged at intervals on the inner side of the secondary air intake ring pipe, the secondary air intake branch pipes are communicated with the secondary air intake nozzle through a secondary air intake elbow, a secondary ejector pipe is arranged at the end of the secondary air intake nozzle, and a secondary ejector gap is left between the secondary air intake nozzle and the secondary ejector pipe.

[0007] A ring plate is horizontally arranged at the bottom of the secondary air intake ring pipe, and the inner edge of the ring plate is connected to the upper end of a section of the secondary induced air duct. The section of the secondary induced air duct is connected to the mixing air duct through a plurality of groups of mixing air duct connecting plates arranged on the outer wall. A primary induced air gap is formed between the section of the secondary induced air duct and the mixing air duct. The primary air duct is arranged in the secondary induced air duct through a primary air duct fixing plate and extends into the mixing air duct. A primary air duct positioning plate is arranged between the mixing air duct and the primary air duct. A primary cone is arranged at the lower part of the primary air duct. The primary cone gradually converges from top to bottom, and the taper of the primary cone is 5 to 60°.

[0008] The secondary air intake nozzle of the present invention is connected to the secondary ejector tube through a plurality of groups of secondary ejector tube connecting pieces arranged at circumferential intervals. The outer diameter of the secondary air intake nozzle is smaller than the inner diameter of the secondary ejector tube to form a secondary ejector gap.

[0009] A secondary ejector tube fixing tube connecting plate is arranged at the lower part of the outer wall of the mixing air duct of the present invention, a secondary ejector tube fixing tube is arranged at the end of the secondary ejector tube fixing tube connecting plate, the secondary ejector tube extends into the secondary ejector tube fixing tube and is limited and fixed by a secondary ejector tube retaining ring arranged on the secondary ejector tube, and the lower end opening of the secondary ejector tube is cut at an acute angle from outside to inside.

[0010] The lower end of the mixing air cylinder of the present invention is provided with a mixing cone, which gradually diverges from top to bottom, and the taper of the mixing cone is 5-60 degrees.

[0011] The lower end of the first section of the secondary induced air duct of the present invention is provided with a gradually converging secondary cone, the taper of the secondary cone is 5 to 60 degrees, the lower end of the secondary cone is provided with a second section of the secondary induced air duct, the lower end of the second section of the secondary induced air duct is flush with the upper end of the mixing air duct or extends into the mixing air duct by a distance of 10 to 50 mm, and a primary induced air gap is formed by utilizing the converging secondary cone and the mixing air duct.

[0012] The burner shell of the present invention is as follows: an upper fixed plate of the shell is arranged on the upper part of the cylindrical shell side plate, and a lower bottom plate is arranged on the lower part; a combustion-supporting gas inlet is connected to the side wall of the shell side plate, and a pressure detection branch pipe is arranged above the combustion-supporting gas inlet; an upper mounting hole of the secondary gas component is processed at the center position of the upper fixed plate of the shell, a lower mounting hole of the secondary gas component is processed at the center position of the lower bottom plate, and fire detection through holes are correspondingly processed on the side walls of the shell side plate and the lower bottom plate.

[0013] The first-level fuel assembly of the present invention is as follows: an air intake flange is arranged at one end of the first-level air intake pipe, a first-level fuel gas nozzle is arranged at the other end, a first-level mounting flange is arranged in the middle, a first-level pressure taking pipe is arranged on the upper part of the first-level mounting flange on the first-level air intake pipe, a swirler is arranged on the first-level air intake pipe near the first-level fuel gas nozzle, and an ignition assembly mounting hole and a fire detection mounting hole are correspondingly arranged on the first-level mounting flange.

[0014] The ignition assembly of the present invention is as follows: one end of the ignition fuel gas main pipe extends into the ignition air main pipe and is connected through a positioning block, and the other end is provided with an ignition rod threaded joint, the upper part of the ignition fuel gas main pipe is vertically connected to an ignition fuel gas external pipe, and the lower end is provided with an ignition gun nozzle, the ignition rod passes through the ignition rod threaded joint, the ignition gun nozzle extends into the lower end of the ignition air main pipe, the end of the ignition fuel gas external pipe is provided with an ignition fuel gas joint, the upper end of the ignition air main pipe is provided with an ignition air annular baffle, the lower end is provided with a pressure cap, the upper part is vertically connected to an ignition air external pipe, and the end of the ignition air external pipe is provided with an ignition air joint.

[0015] The center line of the ignition fuel gas external pipe and the center line of the ignition air external pipe of the present invention are perpendicular to each other.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The present invention forms a primary induced draft gap between the secondary induced draft wind duct and the mixing wind duct by arranging a primary induced draft wind duct, a secondary induced draft wind duct and a mixing wind duct. The high-speed combustion-supporting air draws the flue gas in the furnace back through the primary induced draft gap, causing the flue gas in the furnace to burn secondary, thereby reducing the content of nitrogen oxides.

[0018] 2. The present invention arranges a circle of secondary ejector tubes outside the mixing duct to form a secondary ejector gap between the secondary ejector tube and the secondary air intake nozzle. The secondary ejector gap uses high-speed fuel gas to draw the flue gas in the furnace for secondary combustion, thereby reducing the nitrogen oxide content.

[0019] 3. The present invention arranges a gradually converging secondary cone at the lower part of a section of the secondary induced air duct, thereby strengthening the gathering and acceleration effect of the central swirling wind through the secondary cone, so that the primary induced gap can reflux as much smoke in the furnace as possible for re-combustion, thereby increasing the smoke induced amount, further reducing the oxygen concentration in the combustion-supporting air, effectively reducing the generation of nitrogen oxides, and at the same time reducing the combustion flame temperature, ensuring the stable combustion of the flame.

[0020] 4. The present invention arranges a mixing cone at the lower end of the mixing air cylinder. The gradually diverging mixing cone can make the flame sprayed from the mixing air cylinder diffuse outward, thereby preventing the center flame temperature from being too high and forming more nitrogen oxides.

[0021] 5. The lower end opening of the secondary ejector tube of the present invention is cut at an acute angle from outside to inside, so that the secondary fuel gas ejected from the secondary ejector tube diffuses outward and is ignited by the flame diffused outward ejected from the mixing air duct. This design expands the flame combustion range, makes the fuel gas burn more fully, avoids concentrated combustion of the gas to form a high-temperature area of ​​a fire, and reduces the generation of nitrogen oxides.

[0022] 6. The secondary ejector pipe of the present invention is connected to the smoke exhaust at the end of the burner and is arranged in a high-density circumferential direction to ensure that more smoke can be ejected under the same volume conditions, thereby enhancing the smoke reflux effect. The setting of the two-stage ejector gap of the present invention only requires improving the original smoke ejector structure without adding any complex control mechanism to achieve efficient smoke recovery and nitrogen oxide emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 yes Figure 1 A-direction view.

[0025] Figure 3 yes Figure 1 B view.

[0026] Figure 4 yes Figure 1 Schematic diagram of the structure of the secondary fuel assembly 1.

[0027] Figure 5 yes Figure 4 A-direction view.

[0028] Figure 6 yes Figure 4B view.

[0029] Figure 7 yes Figure 1 Schematic diagram of the structure of the burner shell 2.

[0030] Figure 8 yes Figure 7 A-direction view.

[0031] Fig. 9 yes Figure 1 Schematic diagram of the structure of the middle-stage fuel assembly 7.

[0032] Fig.10 yes Fig. 9 A-direction view.

[0033] Fig.11 yes Fig. 9 B view.

[0034] Fig.12 yes Figure 1 Schematic diagram of the structure of the middle ignition component 6.

[0035] Fig.13 yes Fig.12 A-direction view.

[0036] Fig.14 yes Fig.12 B view.

[0037] Fig.15 It is a schematic diagram of the flue gas circulation principle of the present invention.

[0038] In the figure: 1, secondary fuel assembly; 2, burner shell; 3, flame monitor; 4, furnace casting material; 5, furnace plate; 6, ignition assembly; 7, primary fuel assembly; 1-1, secondary air intake pipe; 1-2, secondary mounting flange; 1-3, secondary air intake ring pipe; 1-4, secondary air intake branch pipe; 1-5, ring plate; 1-6, secondary air intake elbow; 1-7, secondary air intake nozzle; 1-8, secondary induced air cylinder section 1; 1-9, secondary cone cylinder; 1-10, secondary induced air cylinder section 2; 1 -11, primary air duct; 1-12, mixing air duct; 1-13, mixing cone; 1-14, primary cone; 1-15, secondary ejector tube fixing tube connecting plate; 1-16, primary air duct positioning plate; 1-17, secondary ejector tube fixing tube; 1-18, secondary ejector tube retaining ring; 1-19, secondary ejector tube; 1-20, secondary ejector tube connecting piece; 1-21, mixing air duct connecting plate; 1-22, primary air duct fixing plate; 1-23, rib plate; 1-24, angle steel; 1-25 , atomizing nozzle pipe; 1-26, secondary pressure taking pipe; 2-1, upper fixing plate of shell; 2-2, side plate of shell; 2-3, lower bottom plate; 2-4, lower mounting hole of secondary gas assembly; 2-5, combustion-supporting gas inlet; 2-6, pressure detection branch pipe; 2-7, upper mounting hole of secondary gas assembly; 2-8, fire detection through hole; 2-9, shell lifting ear; 6-1, ignition rod; 6-2, ignition rod threaded joint; 6-3, ignition fuel gas joint; 6-4, ignition fuel gas external pipe; 6- 5. Ignition air annular baffle; 6-6. Ignition air external pipe; 6-7. Ignition air connector; 6-8. Ignition fuel gas main pipe; 6-9. Ignition air main pipe; 6-10. Positioning block; 6-11. Ignition gun nozzle; 6-12. De-ignition cap; 7-1. First-level lifting ear; 7-2. First-level pressure taking pipe; 7-3. First-level air inlet pipe; 7-4. First-level mounting flange; 7-5. Swirl; 7-6. First-level fuel gas nozzle; 7-7. Fire detection mounting hole; 7-8. Ignition component mounting hole. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0040] Example 1

[0041] exist Figures 1 to 15In the embodiment, the present invention relates to an ejection type low nitrogen burner, a furnace plate 5 is arranged on the furnace castable 4, and the burner shell 2 is connected and installed on the furnace plate 5 through a threaded fastening connector. The burner shell 2 of this embodiment is composed of a shell upper fixing plate 2-1, a shell side plate 2-2, a lower bottom plate 2-3, a first-stage gas component mounting hole 2-4, a combustion-supporting gas inlet 2-5, a pressure detection branch pipe 2-6, a second-stage gas component mounting hole 2-7, a fire detection through hole 2-8, and a shell hanging ear 2-9. The upper part of the cylindrical shell side plate 2-2 is provided with a shell upper fixing plate 2-1, and the lower part is provided with a lower bottom plate 2-3. The side wall of the shell side plate 2-2 is connected and provided with a combustion-supporting gas inlet 2-5, a pressure detection branch pipe 2-6, a second-stage gas component mounting hole 2-7, a fire detection through hole 2-8, and a shell hanging ear 2-9. The combustion gas inlet 2-5 and the combustion-supporting gas inlet 2-5 are provided with a pressure detection branch pipe 2-6 on the upper part for connecting a pressure measuring instrument. The upper mounting hole 2-7 of the secondary gas assembly is processed at the center position of the upper fixed plate 2-1 of the shell, and the lower mounting hole 2-4 of the secondary gas assembly is processed at the center position of the lower bottom plate 2-3. Fire detection through holes 2-8 are processed correspondingly on the side walls of the shell side plate 2-2 and the lower bottom plate 2-3. The center line of the fire detection through hole 2-8 and the center line of the primary fuel assembly 7 are at an angle of 20°. The flame monitor 3 is arranged through the fire detection through hole 2-8 and the furnace casting material 4. In order to facilitate lifting, shell lifting ears 2-9 are symmetrically arranged on the upper fixed plate 2-1 of the shell. The secondary fuel assembly 1 extends into the furnace through the upper mounting hole 2-7 of the secondary gas assembly, the lower mounting hole 2-4 of the secondary gas assembly, and the furnace castable 4 in sequence; the primary fuel assembly 7 extends into the interior of the secondary fuel assembly 1 through the secondary flange 1-2 of the secondary fuel assembly 1; the ignition assembly 6 extends into the interior of the secondary fuel assembly 1 through the primary mounting flange 7-4 of the primary fuel assembly 7; a fire detection assembly 8 is provided on the primary mounting flange 7-4 of the primary fuel assembly 7; in order to facilitate observation of the flame conditions in the furnace, fire viewing holes are provided on the primary fuel assembly 7 and the secondary fuel assembly 1.

[0042] The secondary fuel assembly 1 of this embodiment comprises a secondary air intake pipe 1-1, a secondary mounting flange 1-2, a secondary air intake ring pipe 1-3, a secondary air intake branch pipe 1-4, a ring plate 1-5, a secondary air intake elbow 1-6, a secondary air intake nozzle 1-7, a second stage ejector air tube section 1-8, a primary air tube 1-11, a mixing air tube 1-12, a primary air tube positioning plate 1-16, a secondary ejector pipe 1-19, a mixing air tube connecting plate 1-21, a primary air tube fixing plate 1-22, a rib plate 1-30, a secondary ejector pipe 1-31, a secondary air tube fixing plate 1-32, a secondary air tube fixing plate 1-33, a secondary air tube fixing plate 1-34, a secondary air tube fixing plate 1-35, a secondary air tube fixing plate 1-36, a secondary air tube fixing plate 1-37, a secondary air tube fixing plate 1-38, a secondary air tube fixing plate 1-39, a secondary air tube fixing plate 1-40, a secondary air tube fixing plate 1-41, a secondary air tube fixing plate 1-42, a secondary air tube fixing plate 1-43, a secondary air tube fixing plate 1-44, a secondary air tube fixing plate 1-45, a secondary air tube fixing plate 1-46, a secondary air tube fixing plate 1-47, a secondary air tube fixing plate 1-48, a secondary air tube fixing plate 1-49, a secondary air tube fixing plate 1-50, a secondary air tube fixing plate 1-51, a secondary air tube fixing plate 1-52, a secondary air tube fixing plate 1-53, a secondary air tube fixing plate 1-54, a secondary air tube fixing plate 1-55, a secondary air tube fixing plate 1-56, a secondary air tube fixing plate 1-57, a secondary air tube fixing plate 1-58, a secondary air tube fixing plate -23, angle steel 1-24, atomizing nozzle pipe 1-25, and secondary pressure-taking pipe 1-26 are connected to form a structure, an air intake flange is arranged at the upper end of the secondary air intake pipe 1-1, a secondary mounting flange 1-2 and a secondary pressure-taking pipe 1-26 are arranged at the upper part, the secondary mounting flange 1-2 is fixedly mounted on the upper fixing plate 2-1 of the shell through a threaded fastening connector, the secondary pressure-taking pipe 1-26 is located at the upper part of the secondary mounting flange 1-2, and an atomizing nozzle pipe 1-25 is arranged on the secondary mounting flange.

[0043] The lower end of the secondary air intake pipe 1-1 is connected to the secondary air intake ring pipe 1-3, and the lower part of the secondary mounting flange is connected to the upper part of the secondary air intake ring pipe 1-3 through the angle steel 1-24 to ensure the connection stability of the secondary air intake ring pipe 1-3. The secondary air intake ring pipe 1-3 is arranged concentrically and circumferentially with the primary fuel assembly 7, and a plurality of groups of secondary air intake branch pipes 1-4 are arranged at intervals inside the secondary air intake ring pipe 1-3. The secondary air intake branch pipes 1-4 are evenly arranged within the 360° phase inside the secondary air intake ring pipe 1-3. The secondary air intake branch pipes 1-4 are connected to the secondary air intake nozzle 1-7 through the secondary air intake elbow 1-6. The end of the secondary air intake nozzle 1-7 is provided with a secondary ejector pipe 1-19, and a secondary ejector gap is left between the secondary air intake nozzle 1-7 and the secondary ejector pipe 1-19. The secondary ejector gap uses the high-speed flowing fuel gas to guide the flue gas in the furnace for secondary combustion to reduce the nitrogen oxide content.

[0044] A ring plate 1-5 is horizontally arranged at the bottom of the secondary air intake ring pipe 1-3, and the inner edge of the ring plate 1-5 is connected to the upper end of the first section of the secondary induced air duct 1-8. In order to ensure the stability of the connection, a rib plate 1-22 is arranged between the ring plate 1-5 and the outer wall of the first section of the secondary induced air duct 1-8. The first section of the secondary induced air duct 1-8 is connected to the mixing air duct 1-12 through a plurality of groups of mixing air duct connecting plates 1-21 arranged on the outer wall. A primary induced air gap is formed between the first section of the secondary induced air duct 1-8 and the mixing air duct 1-12. The high-speed flowing combustion-supporting air draws the flue gas in the furnace back from the first induced air gap, causing the fuel gas in the furnace to burn secondary, thereby reducing the content of nitrogen oxides. The first-level wind tube 1-11 is arranged in the second-level induced wind tube through the first-level wind tube fixing plate 1-22 and extends into the mixing wind tube 1-12. A first-level wind tube positioning plate 1-16 is arranged between the mixing wind tube 1-12 and the first-level wind tube 1-11. A first-level cone 1-14 is arranged at the lower part of the first-level wind tube 1-11. The first-level cone 1-14 gradually converges from top to bottom. The taper of the first-level cone 1-14 is 5 to 60 degrees. The first-level cone 1-14 makes the first-level fuel and the first-level wind mix and then scale through the cone, and form a reflux after being ejected, so that the smoke after combustion diffuses to the outer side of the burner. In the present embodiment, the combustion-supporting gas entering through the combustion-supporting gas inlet 2-4 of the burner housing 2 is divided into two levels. The first-level combustion-supporting gas enters the first-level air duct 1-11 and is mixed with the first-level fuel gas and is ignited by the ignition assembly 6. The second-level combustion-supporting gas enters the second-level induced draft air duct and the mixing air duct 1-12 and is mixed and ignited by the flame ejected from the first-level air duct 1-11. The flame ejected from the mixing air duct 1-12 ignites the second-level fuel gas ejected from the second-level induced draft tube 1-19, and the smoke generated by the combustion refluxes through the first-level induced draft gap and the second-level induced draft gap for secondary combustion.

[0045] The first-level fuel assembly 7 of this embodiment is composed of a first-level lifting ear 7-1, a first-level pressure-taking pipe 7-2, a first-level air inlet pipe 7-3, a first-level mounting flange 7-4, a swirler 7-5, and a first-level fuel gas nozzle 7-6. In order to facilitate lifting, a first-level lifting ear 7-1 is provided at the elbow of the first-level air inlet pipe 7-3, an air inlet flange is provided at one end of the first-level air inlet pipe 7-3, a first-level fuel gas nozzle 7-6 is provided at the other end, a first-level mounting flange 7-4 is provided in the middle, and a first-level taking The pressure pipe 7-2 and the first-level air inlet pipe 7-3 are provided with a swirler 7-5 near the first-level fuel gas nozzle 7-6. The swirler 7-5 is installed at the front of the first-level gas component. When the combustion-supporting gas flows through the swirler, the axial motion is changed into rotational motion, and the airflow is thrown around by the inertial centrifugal force, making the air in the center of the combustion chamber thin, forming a low-pressure area, and the air around the flame tube and a part of the high-temperature fuel gas at the rear flow back to the low-pressure area of ​​the flame tube, forming a reflux, making the axial speed of the airflow relatively small, forming a stable ignition source, and improving the combustion efficiency. The first-level mounting flange 7-4 is correspondingly provided with an ignition component mounting hole 7-8 and a fire detection mounting hole 7-7. The ignition component 6 passes through the ignition component mounting hole 7-8 and extends into the interior of the second-level combustion component 1, and the fire detection component 8 is installed in the fire detection mounting hole 7-7.

[0046] The ignition assembly 6 of this embodiment is composed of an ignition rod 6-1, an ignition rod threaded joint 6-2, an ignition fuel gas joint 6-3, an ignition fuel gas external pipe 6-4, an ignition air annular baffle 6-5, an ignition air external pipe 6-6, an ignition air joint 6-7, an ignition fuel gas main pipe 6-8, an ignition air main pipe 6-9, a positioning block 6-10, an ignition gun nozzle 6-11, and a pressure cap 6-12. One end of the ignition fuel gas main pipe 6-8 extends into the ignition air main pipe 6-9 and passes through the positioning block 6-10. The other end is provided with an ignition rod threaded joint 6-2, the upper part of the ignition fuel gas main pipe 6-8 is vertically connected to an ignition fuel gas external pipe 6-4, and the lower end is provided with an ignition gun nozzle 6-11, the ignition rod 6-1 passes through the ignition rod threaded joint 6-2, and the ignition gun nozzle 6-11 extends into the lower end of the ignition air main pipe 6-9, and the end of the ignition fuel gas external pipe 6-4 is provided with an ignition fuel gas joint 6-3, and the center line of the ignition fuel gas external pipe 6-4 is perpendicular to the center line of the ignition air external pipe 6-6. The upper end of the ignition air main pipe 6-9 is provided with an ignition air annular baffle 6-5, the lower end is provided with a ignition cap 6-12, the upper part is vertically connected to an ignition air external pipe 6-6, and the end of the ignition air external pipe 6-6 is provided with an ignition air joint 6-7.

[0047] Example 2

[0048] In the above-mentioned embodiment 1, the secondary air intake nozzle 1-7 of this embodiment is connected to the secondary ejector tube 1-19 by a plurality of groups of secondary ejector tube connecting plates 1-20 arranged at circumferential intervals. The outer diameter of the secondary air intake nozzle 1-7 is smaller than the inner diameter of the secondary ejector tube 1-19 to form a secondary ejector gap. The remaining components and the connection relationship of the components are exactly the same as those in embodiment 1.

[0049] Example 3

[0050] In the above-mentioned embodiment 1, the lower part of the outer wall of the mixing air cylinder 1-12 of this embodiment is provided with a secondary ejector tube fixing tube connecting plate 1-15, the end of the secondary ejector tube fixing tube connecting plate 1-15 is provided with a secondary ejector tube fixing tube 1-17, the secondary ejector tube 1-19 extends into the secondary ejector tube fixing tube 1-17 and is limited and fixed by a secondary ejector tube retaining ring 1-18 provided on the secondary ejector tube 1-19; the lower end opening of the secondary ejector tube 1-19 is cut from an outer to inner sharp angle, so that the secondary fuel gas ejected from the secondary ejector tube 1-19 diffuses outwards and is ignited by the flame diffused outwards ejected from the mixing air cylinder 1-12, and this design makes the fuel gas burn more fully and reduces the generation of nitrogen oxides. The remaining components and the connection relationship of the components are the same as those in embodiment 1.

[0051] Example 4

[0052] In the above-mentioned embodiment 1, the lower end of the mixing air cylinder 1-12 of this embodiment is provided with a mixing cone 1-13, the mixing cone 1-13 gradually diverges from top to bottom, the taper of the mixing cone 1-13 is 5 to 60 degrees, and the expansion type mixing cone 1-13 is provided to make the flame ejected from the mixing air cylinder 1-12 diffuse outward, so as to avoid the central flame temperature being too high, the combustion being incomplete, and the formation of more nitrogen oxides. The remaining components and the connection relationship of the components are the same as those in embodiment 1.

[0053] Example 5

[0054] In the above-mentioned embodiment 1, the lower end of the first stage of the secondary induced air cylinder 1-8 of this embodiment is provided with a gradually converging secondary cone 1-9, the taper of the secondary cone 1-9 is 5-60°, the lower end of the secondary cone 1-9 is provided with a second stage induced air cylinder 1-10, the second stage induced air cylinder 1-10 rectifies the air after contraction and acceleration to prevent it from diffusing outwards, the lower end of the second stage induced air cylinder 1-10 is flush with the upper end of the mixing air cylinder 1-12 or extends into the mixing air cylinder 1-12 by a distance of 10-50mm, the convergent secondary cone 1-9 and the mixing air cylinder 1-12 are used to form a primary induced gap, and at the same time, the convergent secondary cone 1-9 accelerates the combustion-supporting wind, and the combustion-supporting wind flowing at a high speed after acceleration induced the flue gas in the furnace to flow back from the primary induced gap, so that the gas in the furnace is burned twice, thereby reducing the content of nitrogen oxides. The remaining components and the connection relationship of the components are the same as those in embodiment 1.

[0055] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. In addition, the definitions of directional nouns such as upper and lower in the present invention are limited to describing the connection relationship of components in conjunction with the accompanying drawings.

Claims

1. An ejection type low nitrogen burner, wherein a furnace plate (5) is arranged on a furnace castable (4), and a burner housing (2) is arranged on the furnace plate (5), characterized in that: A primary fuel assembly (7) and an ignition assembly (6) extending therein are arranged at the center of the burner shell (2); a secondary fuel assembly (1) is arranged at the lower part of the burner shell (2); one end of the secondary fuel assembly (1) passes through a furnace casting material (4) and extends into the furnace, and the other end passes through the upper part of the burner shell (2) and extends outward; a flame monitor (3) is arranged on the outer wall of the burner shell (2) through the burner shell (2) and the furnace casting material (4); and a flame detection assembly (8) is arranged on the primary mounting flange (7-4) of the primary fuel assembly (7).

2. The induced low nitrogen burner according to claim 1 is characterized in that The secondary fuel assembly (1) comprises: an air intake flange is arranged at the upper end of the secondary air intake pipe (1-1), a secondary mounting flange (1-2) and a secondary pressure taking pipe (1-26) are arranged at the upper part, the secondary mounting flange (1-2) is arranged on the burner housing (2), the secondary pressure taking pipe (1-26) is located at the upper part of the secondary mounting flange (1-2), an atomizing nozzle pipe (1-25) is arranged on the secondary mounting flange, and the lower end of the secondary air intake pipe (1-1) is connected to the secondary air intake ring pipe (1-26). The secondary air intake ring pipe (1-3) is connected to the primary fuel assembly (7), the secondary air intake ring pipe (1-3) is arranged concentrically with the primary fuel assembly (7), a plurality of groups of secondary air intake branch pipes (1-4) are arranged at intervals inside the secondary air intake ring pipe (1-3), the secondary air intake branch pipes (1-4) are connected to the secondary air intake nozzle (1-7) through the secondary air intake elbow (1-6), a secondary ejector pipe (1-19) is arranged at the end of the secondary air intake nozzle (1-7), and the secondary air intake nozzle (1-7) and the secondary ejector pipe (1-19) are connected to each other. A secondary ejection gap is left between the secondary air intake annular pipe (1-3); a ring plate (1-5) is horizontally arranged at the bottom of the secondary air intake annular pipe (1-3); the inner edge of the ring plate (1-5) is connected to the upper end of a first section of a secondary ejection air duct (1-8); the first section of the secondary ejection air duct (1-8) is connected to the mixing air duct (1-12) through a plurality of groups of mixing air duct connecting plates (1-21) arranged on the outer wall; a primary ejection gap is formed between the first section of the secondary ejection air duct (1-8) and the mixing air duct (1-12). The first-level wind tube (1-11) is arranged in the second-level induced wind tube through the first-level wind tube fixing plate (1-22) and extends into the mixing wind tube (1-12). A first-level wind tube positioning plate (1-16) is arranged between the mixing wind tube (1-12) and the first-level wind tube (1-11). A first-level cone tube (1-14) is arranged at the lower part of the first-level wind tube (1-11). The first-level cone tube (1-14) gradually converges from top to bottom, and the taper of the first-level cone tube (1-14) is 5 to 60 degrees.

3. The induced low nitrogen burner according to claim 2 is characterized in that: The secondary air intake nozzle (1-7) is connected to the secondary ejector tube (1-19) via a plurality of groups of secondary ejector tube connecting pieces (1-20) arranged at circumferential intervals, and the outer diameter of the secondary air intake nozzle (1-7) is smaller than the inner diameter of the secondary ejector tube (1-19) to form a secondary ejector gap.

4. The induced low nitrogen burner according to claim 2 is characterized in that: A secondary ejector tube fixing tube connecting plate (1-15) is arranged at the lower part of the outer wall of the mixing air cylinder (1-12); a secondary ejector tube fixing tube (1-17) is arranged at the end of the secondary ejector tube fixing tube connecting plate (1-15); the secondary ejector tube (1-19) extends into the secondary ejector tube fixing tube (1-17) and is limited and fixed by a secondary ejector tube retaining ring (1-18) arranged on the secondary ejector tube (1-19); and the lower end opening of the secondary ejector tube (1-19) is cut at an acute angle from outside to inside.

5. The induced low nitrogen burner according to claim 2 is characterized in that: A mixing cone (1-13) is arranged at the lower end of the mixing air cylinder (1-12). The mixing cone (1-13) gradually diverges from top to bottom, and the taper of the mixing cone (1-13) is 5 to 60 degrees.

6. The induced low nitrogen burner according to claim 2 is characterized in that: The lower end of the first stage of the secondary induced air cylinder (1-8) is provided with a gradually converging secondary cone (1-9), the taper of the secondary cone (1-9) is 5 to 60 degrees, the lower end of the secondary cone (1-9) is provided with a second stage of the secondary induced air cylinder (1-10), the lower end of the second stage of the secondary induced air cylinder (1-10) is flush with the upper end of the mixing air cylinder (1-12) or extends into the mixing air cylinder (1-12) by a distance of 10 to 50 mm, and a first-stage induced air gap is formed by the converging secondary cone (1-9) and the mixing air cylinder (1-12).

7. The induced low nitrogen burner according to claim 1 is characterized in that The burner shell (2) comprises: a cylindrical shell side plate (2-2) having an upper shell fixing plate (2-1) disposed on the upper part and a lower bottom plate (2-3) disposed on the lower part; a combustion-supporting gas inlet (2-5) is connected and disposed on the side wall of the shell side plate (2-2); a pressure detection branch pipe (2-6) is disposed on the upper part of the combustion-supporting gas inlet (2-5); a secondary gas component upper mounting hole (2-7) is processed at the center position of the shell upper fixing plate (2-1); a secondary gas component lower mounting hole (2-4) is processed at the center position of the lower bottom plate (2-3); and fire detection through holes (2-8) are processed on the side wall of the shell side plate (2-2) and the lower bottom plate (2-3) accordingly.

8. The induced low nitrogen burner according to claim 1 is characterized in that The first-stage fuel assembly (7) comprises: an air intake flange is arranged at one end of a first-stage air intake pipe (7-3), a first-stage fuel gas nozzle (7-6) is arranged at the other end, a first-stage mounting flange (7-4) is arranged in the middle, a first-stage pressure taking pipe (7-2) is arranged on the upper part of the first-stage mounting flange (7-4) on the first-stage air intake pipe (7-3), a swirler (7-5) is arranged on the first-stage air intake pipe (7-3) near the first-stage fuel gas nozzle (7-6), and an ignition assembly mounting hole (7-8) and a fire detection mounting hole (7-7) are correspondingly arranged on the first-stage mounting flange (7-4).

9. The induced low nitrogen burner according to claim 1 is characterized in that The ignition assembly (6) comprises: an ignition fuel gas main pipe (6-8) having one end extending into an ignition air main pipe (6-9) and connected via a positioning block (6-10), and an ignition rod threaded joint (6-2) being provided at the other end; an ignition fuel gas external pipe (6-4) being vertically connected to the upper part of the ignition fuel gas main pipe (6-8) in a circumferential direction, and an ignition gun nozzle (6-11) being provided at the lower end; an ignition rod (6-1) passing through the ignition rod threaded joint (6-2), and the ignition gun nozzle (6-11) extending into the lower end of the ignition air main pipe (6-9); an ignition fuel gas joint (6-3) being provided at the end of the ignition fuel gas external pipe (6-4); an ignition air annular baffle (6-5) being provided at the upper end of the ignition air main pipe (6-9), a ignition cap (6-12) being provided at the lower end; an ignition air external pipe (6-6) being vertically connected to the upper part in a circumferential direction, and an ignition air joint (6-7) being provided at the end of the ignition air external pipe (6-6).

10. The induced low nitrogen burner according to claim 9, characterized in that The center line of the ignition fuel gas external pipe (6-4) and the center line of the ignition air external pipe (6-6) are perpendicular to each other.

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