A sustainable combustion regenerative low-nitrogen burner

Abstract

The present invention discloses a sustainable combustion regenerative low-nitrogen burner, which includes a furnace body, a burner box is provided on the side wall of the furnace body, and a main gun assembly extending into the furnace body is provided at the burner box; two high-temperature air ducts are symmetrically arranged in the furnace lining above the main gun barrel, and a heat storage box connected to the two high-temperature air ducts is provided above the furnace top, and the heat storage box includes two heat storage chambers respectively connected to a high-temperature air duct; heat storage medium is provided in each heat storage chamber, and two low-temperature air ducts connected to the air supply system are provided on the heat storage box, and the two low-temperature air ducts are respectively connected to a heat storage chamber; the air supply system includes at least one blower and one exhaust fan, and also includes at least one switching valve to enable the blower and the exhaust fan to periodically connect to a low-temperature air duct. The beneficial effects of the present invention are: the burner burns continuously without reversing, eliminating the ignition reliability and furnace pressure fluctuation problems caused by the operation of the traditional reversing type regenerative burner system.

Description

Technical Field

[0001] The present invention relates to the technical field of burners, and in particular to a heat storage type low-nitrogen burner with sustainable combustion. Background Art

[0002] The regenerative combustion system has high efficiency and energy saving effects. In the past two decades, it has been widely used in furnace equipment in various industries in China, especially in the aluminum metal smelting and casting industry. Compared with traditional combustion methods, the regenerative combustion system can increase its energy saving efficiency by more than 50%, and the economic benefits are very significant. Therefore, the regenerative combustion system has become the standard configuration of various types of aluminum melting furnace equipment and is a mature and reliable energy-saving combustion technology.

[0003] In the regenerative combustion system, the burners arranged in pairs periodically reverse direction with each other, burning and exhausting smoke alternately, which is a typical feature of this regenerative combustion system.

[0004] This reversing regenerative combustion system has the following problems during operation:

[0005] The burner frequently switches direction for ignition, which places high demands on ignition reliability;

[0006] Frequent reversal of the burner ignition and combustion has a great impact on the furnace pressure, and the furnace pressure fluctuates significantly at the moment of reversal;

[0007] Due to its inherent structural limitations, this reversing burner system cannot exhaust all combustion flue gases. Consequently, furnaces using this reversing regenerative burner system often experience high furnace pressure and flames from the furnace door. High-temperature flue gases can easily damage key components of the regenerative burner, including the ignition gun, main gun, protective sleeve, and burner bricks, resulting in a short operating life and high maintenance costs. Dust easily accumulates within the burner nozzle, affecting burner operation. The burner's flame is too concentrated, resulting in excessively high combustion temperatures, and nitrogen oxide production exceeds environmental emission standards, excluding compliance with emission standards. Summary of the Invention

[0008] The object of the present invention is to provide a sustainable combustion regenerative low-nitrogen burner that solves or partially solves the above-mentioned technical problems.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A sustainable combustion heat storage type low nitrogen burner, which includes a furnace body, a burner box is provided on the side wall of the furnace body, a main gun assembly extending into the furnace body is provided at the burner box, and the main gun assembly includes a main gun barrel, an ignition gun and a primary air duct; two high-temperature air ducts are symmetrically provided in the furnace body lining above the main gun barrel, and a heat storage box connected to the two high-temperature air ducts is provided above the furnace body, and the heat storage box includes two heat storage chambers respectively connected to one of the high-temperature air ducts, and the two heat storage chambers are not connected; each of the heat storage chambers is provided with a storage chamber The heat storage tank is provided with two low-temperature air ducts connected to the air supply system, and the two low-temperature air ducts are respectively connected to one of the heat storage chambers; the air supply system includes at least one blower and one exhaust fan, and further includes at least one switching valve to enable the blower and the exhaust fan to periodically connect to one of the low-temperature air ducts, so that the air supply system supplies air to the furnace body through one of the high-temperature air ducts and exhausts air from the furnace body through the other high-temperature air duct, and the two high-temperature air ducts periodically switch between air supply operation and exhaust operation.

[0011] Preferably, the side wall of the furnace body includes an upper inclined wall and a lower inclined wall protruding outward, and the upper inclined wall, the lower inclined wall and the top lining of the furnace body together form the burner box, and the main gun barrel extends into the burner box through the upper inclined wall at an angle downward, and the ignition gun is arranged to be aligned with the front of the main gun barrel. The high-temperature air duct includes a vertical portion and an inclined portion that are interconnected, and the vertical portion is located above the main gun barrel. The axis of the inclined portion is facing the front of the main gun barrel, and the angle between the inclined portion and the axis of the main gun barrel is in the range of 30 to 60°.

[0012] Preferably, a vortex blade for rotating and sending out the primary air is provided at the outlet of the primary air duct located in the main barrel.

[0013] Preferably, the main gun assembly further includes a sleeve, the main gun barrel is coaxially arranged in the sleeve, the primary air duct is connected to the sleeve from the side wall of the sleeve, and the swirl sheet is arranged in the sleeve and located between the sleeve and the main gun barrel.

[0014] Preferably, two ball-changing gates are provided on the side wall of the heat storage box, each of which is connected to one of the heat storage chambers.

[0015] Preferably, the low-temperature air duct is arranged below the heat storage chamber, and the high-temperature air duct is connected to the heat storage chamber from the top of the heat storage chamber.

[0016] Preferably, a sieve is provided at the bottom of the heat storage chamber and is connected to the low-temperature air duct, and heat storage balls for heat storage are provided on the sieve.

[0017] Preferably, the furnace body and the inner wall of the heat storage box are both provided with an inner lining made of high temperature resistant material.

[0018] The beneficial effects of the present invention are:

[0019] The burner burns continuously without reversing, eliminating the ignition reliability and furnace pressure fluctuation problems caused by the operation of traditional reversing burner systems.

[0020] The main gun assembly of the present invention is independently arranged, away from the air supply and smoke exhaust channels, and is no longer affected by high-temperature reversing, thereby significantly improving the operating reliability of the equipment.

[0021] The high-temperature air duct is located above the main gun and is set vertically, which basically eliminates the phenomenon of dust accumulation and blockage.

[0022] The combustion flame temperature is controlled through various means to suppress the generation of nitrogen oxides.

[0023] The entire device does not occupy the space around the furnace body, which helps to improve the utilization rate of the workshop. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of part of the structure of the present invention;

[0025] Figure 2 yes Figure 1 Schematic diagram of the right view structure;

[0026] Figure 3 yes Figure 1 Middle AA section view;

[0027] Figure 4 yes Figure 1 Schematic diagram of the local structure at C in the middle;

[0028] In the figure, 1. heat storage box; 2. furnace body; 3. high-temperature air duct; 4. main gun assembly; 5. burner box; 11. low-temperature air duct; 12. high-temperature air duct interface; 13. lining; 14. heat storage medium; 15. goal changer; 41. ignition gun; 42. main gun barrel; 43. primary air duct; 44. swirl plate; 45. sleeve; 31. vertical part; 32. inclined part; 51. upper inclined wall; 52. lower inclined wall. DETAILED DESCRIPTION

[0029] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0030] In the description of the present invention, it should be noted that the terms "inside", "outside", "up", "down", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0031] like Figures 1 to 4 As shown, a sustainable combustion regenerative low-nitrogen burner of the present invention includes a furnace body 2, a burner box 5 is provided on the side wall of the furnace body 2, a main gun assembly 4 is provided at the burner box 5 and extends into the furnace body 2, the main gun assembly 4 includes a main gun barrel 42, an ignition gun 41 and a primary air duct 43; it also includes a primary air duct 43; two high-temperature air ducts 3 are symmetrically provided on the furnace body 2 above the main gun barrel 42, a heat storage box 1 connected to the two high-temperature air ducts 3 is provided above the furnace body 2, the heat storage box 1 includes two heat storage chambers (denoted as 1# heat storage chamber and 2# heat storage chamber) respectively connected to a high-temperature air duct 3, and there is a heat storage chamber between the two heat storage chambers. Not connected; a heat storage medium 14 is provided in each heat storage chamber, and two low-temperature air ducts 11 connected to the air supply system are provided on the heat storage box 1, and the two low-temperature air ducts 11 are respectively connected to a heat storage chamber; the air supply system includes at least one blower (not shown) and one exhaust blower (not shown), and also includes at least one switching valve (not shown) to allow the blower and the exhaust blower to periodically connect to a low-temperature air duct 11, so that the air supply system can supply air to the furnace body 2 through a high-temperature air duct 3 and exhaust air from the furnace body 2 through another high-temperature air duct 3, and the two high-temperature air ducts 3 periodically switch between supplying air and exhausting air. The structural design of the air supply system is something that can be achieved by ordinary technicians in this field based on the above requirements without creative work, and therefore is not shown in detail.

[0032] The sidewalls of the furnace body 2 include an upper sloping wall 51 and a lower sloping wall 52 protruding outwards, which together form a burner box 5 with the top of the furnace body 2. The inner side of the burner box 5 is a bell-mouth structure inclined toward the inside of the furnace body 2.

[0033] The main gun barrel 42 extends obliquely downward through the upper inclined wall 51 into the furnace body 2. The ignition gun 41 is arranged to be aligned with the front of the main gun barrel 42. The high-temperature air duct 3 includes a vertical portion 31 and an inclined portion 32 that are interconnected. The vertical portion 31 is located above the main gun barrel 42. The axis of the inclined portion 32 is directly opposite the front of the main gun barrel 42, and the angle Q between the inclined portion 32 and the axis of the main gun barrel 42 is in the range of 30 to 60 degrees.

[0034] The primary air duct 43 is located at the outlet of the main gun barrel 42 and is provided with a vortex blade 44 for rotating and sending the primary air out.

[0035] The main gun assembly 4 also includes a sleeve 45, the main gun barrel 42 is coaxially arranged in the sleeve 45, the primary air duct 43 is connected to the sleeve 45 from the side wall of the sleeve 45, and the swirl plate 44 is arranged in the sleeve 45 and located between the sleeve 45 and the main gun barrel 42.

[0036] Two ball-changing gates 15 are provided on the side wall of the heat storage box 1 and are connected to a heat storage chamber respectively.

[0037] The low-temperature air duct 11 is arranged below the heat storage chamber, and the high-temperature air duct 3 is connected to the heat storage chamber from the top of the heat storage chamber.

[0038] A grate (not shown) and a low-temperature air duct 11 are provided at the bottom of the heat storage chamber. Heat storage balls (ie, heat storage medium 14) for heat storage are provided on the grate.

[0039] The furnace body 2 and the inner wall of the heat storage tank 1 are both provided with an inner lining 13 made of high temperature resistant material.

[0040] During operation, a blower (not shown) draws combustion-supporting air from the low-temperature air duct 11 of regenerator #1 into the thermal storage tank 1. There, the air undergoes heat exchange with the thermal storage medium 14. After being heated, it passes through the connected high-temperature air duct 3 and enters the furnace from above the main gun barrel 42, where it mixes and burns with the natural gas introduced by the main gun barrel 42. Simultaneously, an exhaust blower (not shown) operates, drawing high-temperature flue gas from the furnace through another high-temperature air duct 3. The exhaust gas enters the second regenerator through the high-temperature air duct interface 12, exchanges heat with the thermal storage medium 14, and is then discharged through the low-temperature air duct 11 of the second regenerator. This entire process alternates according to a set cycle, constantly delivering preheated combustion-supporting air to the vicinity of the main gun barrel 42 for combustion support, while simultaneously drawing the high-temperature flue gas from the furnace out for discharge.

[0041] During the entire process, the main gun barrel 42 continues to burn and does not participate in the switching of air supply and smoke exhaust.

[0042] The ignition gun 41 continues to burn to ensure that the main barrel 42 burns normally during the reversing process.

[0043] Adjusting the primary air supply can change the flame shape.

[0044] Nitrogen oxides are suppressed during the combustion process by the following means.

[0045] The primary air is cold air that has not been preheated. Its entry point is at the core of the flame, which helps to reduce the combustion flame temperature and inhibit the formation of nitrogen oxides.

[0046] The intersection of the secondary air (i.e. the combustion air sent into the heat storage tank 1) and the main gun barrel 42 is located in the furnace, and burns while being mixed. The combustion process helps to mix into the flue gas in the furnace, helps to reduce the combustion flame temperature, and inhibit the generation of nitrogen oxides.

[0047] Combustion and smoke exhaust are carried out simultaneously and concentratedly at adjacent positions. Under the action of smoke exhaust suction, the smoke in the furnace is helped to flow to the main gun barrel 42, which helps to reduce the combustion flame temperature and inhibit the generation of nitrogen oxides.

[0048] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A sustainable combustion regenerative low-nitrogen burner, comprising a furnace body, characterized in that: A burner box is provided on the side wall of the furnace body, and a main gun assembly extending into the furnace body is provided at the burner box, and the main gun assembly includes a main gun barrel, an ignition gun and a primary air duct; two high-temperature air ducts are symmetrically arranged in the furnace wall lining above the main gun barrel, and a heat storage box connected to the two high-temperature air ducts is provided above the furnace body, and the heat storage box includes two heat storage chambers respectively connected to one of the high-temperature air ducts, and the two heat storage chambers are not connected; heat storage medium is provided in each of the heat storage chambers, and two low-temperature air ducts connected to the air supply system are provided on the heat storage box, and the two low-temperature air ducts are respectively connected to one of the heat storage chambers; the air supply system includes at least one blower and one exhaust fan, and also includes at least one switching valve so that the blower and the exhaust fan are periodically connected to one of the low-temperature air ducts. , so that the air supply system supplies air to the furnace body through one of the high-temperature air ducts and exhausts air from the furnace body through the other high-temperature air duct, and the two high-temperature air ducts periodically switch between air supply and exhaust operations; the side wall lining of the furnace body includes an upper inclined wall and a lower inclined wall protruding outward, and the upper inclined wall, the lower inclined wall and the top of the furnace top lining together form the burner box, the main gun barrel passes through the upper inclined wall and extends into the burner box at an angle downward, the ignition gun is arranged to be aligned with the front of the main gun barrel, and the high-temperature air duct includes a vertical portion and an inclined portion that are interconnected, the vertical portion is located above the main gun barrel, the axis of the inclined portion is facing the front of the main gun barrel, and the angle between the inclined portion and the axis of the main gun barrel is in the range of 30 to 60 degrees.

2. The sustainable combustion regenerative low-nitrogen burner according to claim 1 is characterized in that: The outlet of the primary air duct in the main gun barrel is provided with a vortex sheet for rotating and sending out the primary air.

3. The sustainable combustion regenerative low-nitrogen burner according to claim 2 is characterized in that: The main gun assembly also includes a sleeve, the main gun barrel is coaxially arranged in the sleeve, the primary air duct is connected to the sleeve from the side wall of the sleeve, and the swirl sheet is arranged in the sleeve and located between the sleeve and the main gun barrel.

4. The sustainable combustion regenerative low-nitrogen burner according to claim 1 is characterized in that: Two ball-changing gates are provided on the side wall of the heat storage box and are respectively connected to one of the heat storage chambers.

5. The sustainable combustion regenerative low-nitrogen burner according to claim 4 is characterized in that: The low-temperature air duct is arranged below the heat storage chamber, and the high-temperature air duct is connected to the heat storage chamber from the top of the heat storage chamber.

6. The sustainable combustion regenerative low-nitrogen burner according to claim 5 is characterized in that: The bottom of the heat storage chamber is provided with a sieve and the low-temperature air duct, and heat storage balls for heat storage are provided on the sieve.

7. The sustainable combustion regenerative low-nitrogen burner according to claim 1 is characterized in that: The furnace body and the inner wall of the heat storage box are both provided with linings made of high temperature resistant material.

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