Fully premixed combustion environment-friendly energy-saving gas burner

Abstract

The utility model discloses a full premixed combustion environment-friendly energy-saving gas burner which comprises a barrel, an air inlet is formed in the side face of the barrel, a gas mechanism is arranged at the bottom of the barrel, a main combustion gun in the gas mechanism extends into a center basin of a fire basin mechanism, a plurality of ejectors are annularly arranged on the side wall of the center basin, inlets of the ejectors are matched with side combustion guns in the gas mechanism, and the side combustion guns are arranged on the side face of the barrel. An outlet of the ejector is positioned below a combustion cover built-in porous plate at the top of the barrel; a top opening of the combustion cover is connected with a porous cover; according to the combustor, by means of the Venturi effect, fuel gas with high pressure ejects flue gas in a furnace to enter the flameless combustion cover and then is fully premixed with air in the cover, fully premixed flameless combustion is achieved, the combustion temperature is controlled to be 1350 DEG C or below, an NOx sensitive generation area is avoided, the combustion area is stable, combustion is sufficient, a low excess air coefficient is adopted, and the combustion efficiency is improved. The three-low combustion effect of low NOx, low CO and low oxygen (excess) is achieved, and the purposes of environmental protection, energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion equipment, in particular to a full premixed combustion environmentally friendly energy-saving gas burner. Background Art

[0002] The flue gas discharged by the industrial furnace burner will contain a large amount of NOx gas, which will pollute the environment. Directly recirculating this part of the flue gas for secondary combustion can effectively reduce the emission of NOx, but at the same time it will reduce the flame temperature to a very low level and be very uneven, which will cause part of the fuel gas to fail to burn out in the flame area, and will enter the top of the radiation chamber with the furnace flue gas, and finally be discharged into the atmosphere, resulting in a large waste and bringing certain safety hazards to the operation of the heating furnace. In addition, the combustion area of ​​the flue gas recirculation technology is relatively concentrated, making NOx control quite difficult, and there is a problem of oxygen deficiency in the flame area, which leads to frequent excess of flue gas dust. On the contrary, if too much air is filled, it means that the heat carried away with the air discharge increases, which will lead to a decrease in the thermal efficiency of the heating furnace. The porous disc flame stabilizer used abroad attempts to improve this situation, but in actual applications, the flame temperature of the stabilizer is too high (over 1350℃), the service life of the porous disc is not long, and the emission of NOx in its flue gas does not meet the national standard. In short, there is no burner on the market that can achieve full premixing of flue gas, fuel gas and air to achieve the goal of energy conservation and emission reduction. Utility Model Content

[0003] In order to solve the above problems, the utility model proposes a fully premixed combustion, environmentally friendly and energy-saving gas burner, including a cylinder, an air inlet is opened on the side of the cylinder, a gas mechanism is arranged at the bottom of the cylinder, a main combustion gun in the gas mechanism extends into the central basin of the fire basin mechanism, a plurality of ejectors are arranged around the side wall of the central basin, the ejector inlet cooperates with the side combustion guns in the gas mechanism, the ejector outlet is located below the built-in porous plate of the combustion hood at the top of the cylinder, and the top of the combustion hood is open and connected to the porous cover.

[0004] Furthermore, the gas mechanism includes an annular gas pipe, which is installed on the bottom surface of the cylinder and connected to the bottom of the side burner. The side burner is evenly arranged in a circle inside the cylinder wall. The annular gas pipe and the feed port of the main burner are respectively connected to two output ends of the distributor with control valves through metal hoses, and the input end of the distributor is connected to the main gas pipeline.

[0005] Furthermore, the fire basin mechanism includes a ring plate, which separates the upper end of the cylinder into a refractory section, the inner wall of the refractory section is cast with a refractory lining, and the inner lining sleeve of the refractory lining is provided with a plurality of ribs, which support the sleeve of the center basin, and a cyclone is provided at the bottom of the sleeve.

[0006] Furthermore, the lamp tube of the ever-burning lamp is inserted into the circular hole on the bottom surface of the cylinder body, and the lamp head of the ever-burning lamp extends into the fire basin mechanism and is located between two adjacent ejectors. The tail of the ever-burning lamp is a threaded joint, which is connected to the gas pipeline through a metal hose.

[0007] Furthermore, a thermocouple is provided on the side wall of the combustion hood, and the thermocouple is electrically connected to a temperature display installed on the outer wall of the cylinder, and the temperature display is electrically connected to the air inlet and each control valve in the gas mechanism.

[0008] The beneficial effects of the utility model are as follows: the utility model utilizes the Venturi effect to allow the high-pressure fuel gas to draw the flue gas in the furnace into the flameless combustion hood, and then fully premix it with the air in the hood to achieve fully premixed flameless combustion, and the combustion temperature is controlled below 1350°C, avoiding the NOx sensitive generation area, the combustion area is stable, the combustion is sufficient, and a lower excess air coefficient is used to achieve a low NOx, low CO, and low oxygen (excess) combustion effect. It is suitable for all flame device heating furnaces, industrial furnaces, boilers and other devices, has strong adaptability to furnace temperature, and can achieve good energy-saving and emission reduction effects under any working conditions, and can control NOx at 20mg / Nm 3 Within, control CO at 5mg / Nm 3 The excess air coefficient is controlled below 1.03, achieving the goals of environmental protection, energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the internal structure of the utility model;

[0010] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0011] Figure 3 This is a schematic diagram of the installation relationship of the combustion hood in the utility model;

[0012] Figure 4 It is a structural schematic diagram of the porous plate in the utility model.

[0013] The reference numerals are as follows: 1. cylinder; 101. air inlet; 2. main burner; 3. center basin; 4. ejector; 5. side burner; 6. combustion hood; 7. porous plate; 8. porous cover; 9. annular air pipe; 10. distributor; 11. ring plate; 12. refractory lining; 13. rib plate; 14. ever-burning lamp; 15. thermocouple; 16. temperature display; 17. cyclone. DETAILED DESCRIPTION

[0014] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0015] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] like Figures 1 to 4 As shown, a fully premixed combustion environmentally friendly energy-saving gas burner includes a cylinder 1, an air inlet 101 is opened on the side of the cylinder 1, a gas mechanism is arranged at the bottom of the cylinder 1, and the gas mechanism includes an annular gas pipe 9, which is installed on the bottom of the cylinder 1, and the annular gas pipe 9 is connected to the bottom of the side burner 5. The side burner 5 is evenly arranged in a circle in the cylinder wall of the cylinder 1. The annular gas pipe 9 and the feed port of the main burner 2 are respectively connected to the two output ends of the distributor 10 with control valves through a metal hose, and the input end of the distributor 10 is connected to the main gas pipeline. The main burner 2 extends into the central basin 3 of the fire basin mechanism, and the fire basin mechanism includes a ring plate 11, which separates the upper end of the cylinder 1 into a refractory section, and the inner wall of the refractory section is cast with a refractory lining 12. The inner lining sleeve of the refractory lining 12 is surrounded by a plurality of ribs 13, and the ribs 13 support the sleeve of the central basin 3, and a swirler 17 is arranged at the bottom of the sleeve. A number of ejectors 4 are arranged around the side wall of the central basin 3, and the fuel gas nozzle at the head of the side combustion gun 5 is horizontally pointed to the inlet of the ejector 4. The outlet of the ejector 4 is located below the built-in porous plate 7 of the combustion hood 6 at the top of the cylinder 1, and the top of the combustion hood 6 is open and connected to the porous cover 8.

[0018] In this embodiment, the lamp tube of the ever-burning lamp 14 is inserted into the circular hole on the bottom surface of the cylinder 1, and the lamp head of the ever-burning lamp 14 extends into the rib plate 13 in the fire basin mechanism, and is located between two adjacent ejectors 4. The tail of the ever-burning lamp 14 is a threaded joint, and the threaded joint is connected to the gas pipeline through a metal hose. The side wall of the combustion cover 6 is provided with a thermocouple 15, and the thermocouple 15 is electrically connected to a temperature display 16 installed on the outer wall of the cylinder 1, and the temperature display 16 is electrically connected to the air inlet 101 and each control valve in the gas mechanism.

[0019] The working principle of the utility model is as follows:

[0020] The distributor 10 injects fuel gas into the main combustion gun 2, and the combustion-supporting air enters the cylinder 1 through the air inlet 101. Under the enhanced turbulence effect of the swirler 17, the fuel gas sprayed from the main combustion gun 2 and the air are fully mixed in the central basin 3, and are ignited by the flame of the long-burning lamp 14 at the outlet of the central basin 3 to form a stable central flame, providing a stable ignition source for the full premixed combustion in the flameless combustion hood 6 to ensure safe and stable combustion. When the combustion reaches a certain degree, the distributor 10 distributes the fuel gas to the side combustion gun 5 through the annular air pipe 9. The fuel gas sprayed from the side combustion gun 5 passes through the ejector 4 and brings a large amount of flue gas in the furnace to the combustion hood 6 for full premixing of the fuel gas, flue gas and air. The mixed gas is ignited by the fire source in the central basin 3, and then passes through the porous plate 7 and the porous cover 8 for complete combustion. The high-temperature flue gas after complete combustion enters the furnace for radiation and convection heat transfer. In the above process, the amount of flue gas in the furnace induced by the fuel gas injected by the side-burning gun 5 is adjusted by the control valve at the distributor 10 to ensure that the flue gas temperature after full premixed combustion is lower than 1350°C, that is, lower than the sensitive temperature line of high-temperature thermal NOx generation, thereby ensuring that the combustion achieves a low NOx effect.

[0021] The utility model utilizes the Venturi effect to allow the relatively high-pressure fuel gas to draw the smoke in the furnace into the flameless combustion hood 6, and then fully premix it with the air in the hood to achieve fully premixed flameless combustion. The combustion temperature is controlled below 1350°C, avoiding the NOx sensitive generation area, the combustion area is stable, the combustion is sufficient, and a relatively low excess air coefficient is adopted to achieve the three-low combustion effects of low NOx, low CO, and low oxygen (excess), thereby achieving the purpose of environmental protection, energy saving and emission reduction.

[0022] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A fully premixed combustion environmentally friendly and energy-saving gas burner, comprising a cylinder (1), characterized in that: The cylinder (1) is provided with an air inlet (101) on the side thereof, a gas mechanism is provided at the bottom thereof, a main burner (2) in the gas mechanism extends into the central basin (3) of the fire basin mechanism, a plurality of ejectors (4) are provided around the side wall of the central basin (3), an inlet of the ejector (4) cooperates with a side burner (5) in the gas mechanism, an outlet of the ejector (4) is located below a porous plate (7) built into a combustion hood (6) at the top of the cylinder (1), and the top of the combustion hood (6) is open and connected to a porous cover (8).

2. The full premix combustion environmentally friendly and energy-saving gas burner according to claim 1 is characterized in that: The gas mechanism comprises an annular gas pipe (9), which is mounted on the bottom surface of the cylinder (1), connected to the bottom of the side burner (5), and the side burner (5) is evenly arranged in a ring inside the cylinder wall of the cylinder (1). The annular gas pipe (9) and the feed port of the main burner (2) are respectively connected to two output ends of a distributor (10) with control valves through a metal hose, and the input end of the distributor (10) is connected to a main gas pipeline.

3. The full premix combustion environmentally friendly and energy-saving gas burner according to claim 1 is characterized in that: The fire basin mechanism comprises a ring plate (11), the ring plate (11) separates the upper end of the cylinder (1) into a refractory section, the inner wall of the refractory section is cast with a refractory lining (12), the inner lining sleeve of the refractory lining (12) is provided with a plurality of rib plates (13), the rib plates (13) support the sleeve of the central basin (3), and a cyclone (17) is provided at the bottom of the sleeve.

4. The full premixed combustion environmentally friendly and energy-saving gas burner according to claim 1 is characterized in that: The tube of the ever-burning lamp (14) is inserted into the circular hole on the bottom surface of the cylinder (1), and the lamp head of the ever-burning lamp (14) extends into the fire basin mechanism and is located between two adjacent ejectors (4). The tail of the ever-burning lamp (14) is a threaded joint, which is connected to the gas pipeline through a metal hose.

5. The full premix combustion environmentally friendly and energy-saving gas burner according to claim 1 is characterized in that: A thermocouple (15) is provided on the side wall of the combustion hood (6); the thermocouple (15) is electrically connected to a temperature display (16) mounted on the outer wall of the cylinder (1); and the temperature display (16) is electrically connected to the air inlet (101) and various control valves in the gas mechanism.

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