Novel premixing burner of industrial kiln

Abstract

The invention discloses a premixing burner of a novel industrial kiln. The premixing burner comprises a burner body. The mixer is arranged at one end of the burner body so as to provide mixed gas for the burner body; the electromagnetic valve is arranged at the input end of the mixer so as to adjust the input on-off of the mixed gas; the air-fuel proportional valve is connected to one end of the electromagnetic valve so as to adjust the proportion of the mixed gas; according to the industrial kiln burner, the shrinkage pipe, the mixing pipe and the diffuser pipe are arranged, so that the risk that mixed gas is small in flow speed, short in sprayed flame and capable of generating backfire when entering the burner body is avoided, the flow speed can be well increased, the length of the flame sprayed to a hearth on the inner side of an industrial kiln during burning is increased, backfire can be well reduced, and the service life of the industrial kiln is prolonged. And through the electromagnetic valve, the PLC module and the controller, conveying of the mixed gas can be automatically closed during flameout or tempering, and the use safety is improved.

Description

Technical Field

[0001] The present invention particularly relates to a novel premix burner for an industrial furnace. Background Art

[0002] Industrial kiln burners are key components in industrial kiln systems, used to provide fuel combustion to generate high temperatures to meet the needs of various industrial processes. The design and performance of the burner directly affect the energy efficiency, emissions and stability of the kiln production process.

[0003] The existing patent application number is: 2021109843968, a fully premixed combustion device that achieves high efficiency, high temperature, safety and anti-backfire, and reduces heat loss, accurately adjusts the air-fuel ratio, and makes the combustion more complete and environmentally friendly.

[0004] However, there are still some disadvantages in actual use. Since the burner adds a mixer at the front end of the burner, after the air and gas are mixed by the mixer, they flow over a long distance, the fluid velocity decreases, the pressure decreases, and backfire may occur, causing damage to the burner; the mixed gas flows into the main burner cavity. Since the inlet end of the main burner is designed as a 90° circuitous structure, the airflow resistance increases, resulting in a shorter flame, which is not suitable for industrial furnaces with a large internal volume. For this reason, we propose a new premixed burner for industrial furnaces. Summary of the invention

[0005] The object of the present invention is to provide a novel premix burner for an industrial furnace to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a new type of premix burner for an industrial furnace, comprising:

[0007] Burner body;

[0008] A mixer, disposed at one end of the burner body to provide a mixed gas to the burner body;

[0009] A solenoid valve is arranged at the input end of the mixer to adjust the input on and off of the mixed gas;

[0010] The air-fuel ratio valve is connected to one end of the solenoid valve to adjust the ratio of the mixed gas;

[0011] The mixer comprises a contraction tube, a mixing tube and a diffuser tube. One end of the mixing tube is connected to a contraction tube for increasing the velocity of the mixed gas flow, and the other end of the mixing tube is provided with a diffuser tube.

[0012] It is convenient for the mixed gas to enter the mixer. After passing through the contraction tube, the mixed gas enters the mixing tube at the maximum speed. The air and gas particles collide at high speed and mix evenly. Finally, they are sent to the burner body in a straight line through the diffuser tube, which greatly reduces the internal resistance of the airflow and increases the ejection speed of the mixed gas.

[0013] Preferably, a fire protection tube is provided at the other end of the burner body, and a flame outlet is provided at one end of the fire protection tube.

[0014] It is convenient to better concentrate the flame for spraying through the fire protection tube.

[0015] Preferably, a flame stabilizing disk is fixed inside the burner body, and an integrated ignition and flame stabilizing needle is arranged inside the flame stabilizing disk.

[0016] The burner is ignited to form a flame. At the same time, the ignition and flame stabilization needle can collect signals and transmit them to the PLC module to determine whether it is flameout or backfire.

[0017] Preferably, the solenoid valve is connected to a controller, the output end of the controller is electrically connected to the ignition and flame-stabilizing integrated pin, and the input end of the controller is connected to a PLC module.

[0018] It is convenient to control the on and off of the solenoid valve to turn the burner on and off.

[0019] Preferably, the input end of the air-fuel ratio valve is provided with a fuel pipe for conveying fuel gas, and the fuel pipe is provided with a gas flow valve.

[0020] It is convenient to adjust the gas flow rate delivered.

[0021] Preferably, the other input end of the air-fuel ratio valve is connected to an air pipe for conveying air, and a first fan is provided at one end of the air pipe.

[0022] It is convenient to increase the flow rate of incoming air.

[0023] Preferably, the air pipe is provided with an air flow valve for adjusting the flow rate.

[0024] Easy to adjust the delivered air flow.

[0025] Preferably, a connecting pipe is provided at the other input end of the mixer, and a second pressure regulating valve is provided on the connecting pipe, and one end of the connecting pipe is connected to the inside of the air pipe.

[0026] It is convenient to readjust the air content in the mixture.

[0027] Preferably, the burner body is connected to a second fan for providing air again.

[0028] It is convenient to further adjust the air flow into the burner body.

[0029] Preferably, a first pressure regulating valve is provided between the solenoid valve and the mixer, and the burner body and the mixer are made of stainless steel.

[0030] It is convenient to better adjust the intake pressure and improve corrosion resistance.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This patent is provided with a contraction tube, a mixing tube and a diffuser tube to avoid the risk of flashback when the mixed gas enters the burner body with a low flow rate and a short flame. This device can greatly increase the flow rate and increase the length of the flame sprayed into the inner furnace of the industrial kiln during combustion, which can greatly reduce the occurrence of flashback. In addition, the solenoid valve, PLC module and controller can automatically shut down the delivery of the mixed gas in the event of flameout or flashback, thereby improving safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention;

[0034] Figure 2 It is a schematic diagram of the mixer structure of the present invention.

[0035] In the figure: 1. Burner body; 2. Industrial kiln; 3. Flame nozzle; 4. Mixer; 401. Contraction tube; 402. Mixing tube; 403. Diffuser; 5. Gas flow valve; 6. First fan; 7. Air flow valve; 8. Second pressure regulating valve; 801. Connecting pipe; 9. First pressure regulating valve; 10. Solenoid valve; 11. Air-fuel ratio valve; 12. Fire protection cylinder; 13. Flame stabilizing disk; 14. Second fan; 15. PLC module; 16. Controller; 17. Ignition and flame stabilizing integrated needle. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] See also Figure 1 , Figure 2 The present invention provides a technical solution: a new type of premix burner for an industrial furnace, comprising:

[0038] Burner body 1;

[0039] The mixer 4 is arranged at one end of the burner body 1 to provide a mixed gas to the burner body 1;

[0040] The solenoid valve 10 is arranged at the input end of the mixer 4 to adjust the input on and off of the mixed gas;

[0041] The air-fuel ratio valve 11 is connected to one end of the solenoid valve 10 to adjust the ratio of the mixed gas;

[0042] The mixer 4 includes a contraction tube 401 , a mixing tube 402 and a diffuser tube 403 . One end of the mixing tube 402 is connected to the contraction tube 401 for increasing the velocity of the mixed gas flow, and the other end of the mixing tube 402 is provided with a diffuser tube 403 .

[0043] The air-fuel ratio valve 11 is used to adjust the fuel gas and air to a suitable ratio to improve the completeness of combustion, and then the fuel gas is transported to the mixer 4. The mixed gas enters the mixer 4, and then passes through the contraction tube 401 and enters the mixing tube 402 at the maximum speed. The air and gas particles collide at high speed and are mixed evenly. Finally, the gas is sent to the burner body 1 in a straight line through the diffuser tube 403, which greatly reduces the internal resistance of the airflow and improves the ejection speed of the mixed gas.

[0044] Preferably, a fire protection tube 12 is provided at the other end of the burner body 1, and a flame outlet 3 is provided at one end of the fire protection tube 12.

[0045] After the flame is gathered through the fire protection tube 12, a high-speed straight flame is formed and sprayed into the furnace of the industrial kiln 2 through the flame nozzle 3, so that the flame can be better gathered for spraying.

[0046] Preferably, a flame stabilizing disk 13 is fixed inside the burner body 1 , and an ignition and flame stabilizing integrated needle 17 is arranged inside the flame stabilizing disk 13 .

[0047] The burner is ignited to form a flame. In the event of an unexpected flameout or backfire in the burner body 1, the ignition and flame stabilization needle 17 will transmit the collected signal to the PLC module 15 and the controller 16. At this time, after the system makes a judgment, it sends a gas shutdown signal to the solenoid valve 10 to shut off the gas and avoid gas leakage.

[0048] Preferably, the solenoid valve 10 is connected to a controller 16 , the output end of the controller 16 is electrically connected to the ignition and flame-stabilizing integrated needle 17 , and the input end of the controller 16 is connected to a PLC module 15 .

[0049] It is convenient to control the on and off of the solenoid valve 10 to turn the burner on and off when an unexpected flameout or backfire is detected in the burner body 1.

[0050] Preferably, the input end of the air-fuel ratio valve 11 is provided with a fuel pipe for conveying fuel gas, and the fuel pipe is provided with a gas flow valve 5 .

[0051] It is convenient to adjust the gas flow rate and accurately adjust the ratio of air to gas.

[0052] Preferably, the other input end of the air-fuel ratio valve 11 is connected to an air pipe for conveying air, and a first fan 6 is provided at one end of the air pipe.

[0053] It is convenient to accelerate the air through the first fan 6 to increase the flow rate of the incoming air.

[0054] Preferably, an air flow valve 7 for adjusting the flow rate is provided on the air pipe.

[0055] It is convenient to adjust the air flow rate delivered so that the air-fuel ratio valve 11 can accurately adjust the ratio of air to gas.

[0056] Preferably, a connecting pipe 801 is provided at the other input end of the mixer 4, and a second pressure regulating valve 8 is provided on the connecting pipe 801, and one end of the connecting pipe 801 is connected to the inside of the air pipe.

[0057] It is convenient to replenish air and adjust the air content in the mixed gas again, so that the subsequent fuel gas can be burned more fully and the combustion effect can be improved.

[0058] Preferably, the burner body 1 is connected to a second fan 14 for providing air again.

[0059] It is convenient to supplement air in the burner body 1 to further adjust the air flow rate flowing into the burner body 1 to improve the combustion efficiency.

[0060] Preferably, a first pressure regulating valve 9 is provided between the solenoid valve 10 and the mixer 4, and the burner body 1 and the mixer 4 are both made of stainless steel.

[0061] It is convenient to better adjust the intake pressure, improve corrosion resistance, increase strength, and extend the service life of the device.

[0062] The working principle and use process of the present invention are as follows: during manufacture, the burner body 1 core is made of SUS304 stainless steel, the flame stabilizing disk 13 is made of SUS316 stainless steel, the ignition flame stabilizing integrated needle 17 is made of chromium-nickel alloy steel wire + 95 ceramic composite high-temperature material, the mixer 4 shell is made of SUS304 stainless steel with black high-temperature water-based paint sprayed on the surface, and the conical fire protection tube 12 is made of SUS304 stainless steel with thermal barrier coating sprayed on the surface. When in use, the gas enters the air-fuel ratio valve 11 through the gas flow valve 5, and the air is successively introduced into the air-fuel ratio valve 11 through the first fan 6 and the air flow valve 7, and the air and gas ratio is adjusted by the air-fuel ratio valve 11, and then enters the mixer 4. The mixer 4 adopts a Venturi structure. After passing through the contraction tube 401, the gas enters the mixing tube 402 at the maximum speed. The air and gas sub-groups collide at high speed and mix evenly. Finally, they are sent straightly through the diffuser tube 403. To the burner body 1, the internal resistance of the airflow is greatly reduced, and the ejection speed of the mixed gas is increased. The air can be further introduced into the burner body 1 through the second fan 14, mixed again, ignited by the ignition and flame-stabilizing integrated needle 17 in the burner body 1, and then transmitted from a single fire hole to all fire holes. Finally, after the flame is gathered by the fire protection tube 12, a high-speed straight flame is formed and sprayed into the furnace of the industrial kiln 2 through the flame outlet 3; further, when igniting, the PLC module 15 remotely sends an ignition command to the controller 16, and the controller 16 ignites through the ignition and flame-stabilizing integrated needle 17. In the event of unexpected flameout or backfire in the burner body 1, the ignition and flame-stabilizing integrated needle 17 will transmit the collected signal to the PLC module 15 and the controller 16. At this time, after the system makes a judgment, it sends a gas shutdown signal to the solenoid valve 10 to shut down the gas and avoid gas leakage.

[0063] Through experiments, the flame ejection speed of the premixed burner made by the present application can reach: 140 ~ 160m / s, the ejection flame length is more than 1.6 meters, the combustion thermal efficiency is as high as more than 95%, and the applicable gas types include: natural gas, liquefied petroleum gas, methane, propane, butane, coke oven gas, etc., and it has a wide range of promotion.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated 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, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new type of premix burner for industrial kilns, characterized in that: include: Burner body (1); A mixer (4) is arranged at one end of the burner body (1) to provide a mixed gas to the burner body (1); A solenoid valve (10) is arranged at the input end of the mixer (4) to adjust the input on and off of the mixed gas; An air-fuel ratio valve (11) connected to one end of the solenoid valve (10) to adjust the ratio of the mixed gas; The mixer (4) comprises a contraction tube (401), a mixing tube (402) and a diffuser tube (403); one end of the mixing tube (402) is connected to the contraction tube (401) for increasing the velocity of the mixed gas; the other end of the mixing tube (402) has a diffuser tube (403).

2. The novel premix burner for industrial furnace according to claim 1 is characterized in that: A fire protection tube (12) is arranged at the other end of the burner body (1), and a flame ejection port (3) is opened at one end of the fire protection tube (12).

3. The novel premix burner for industrial furnace according to claim 1 is characterized in that: A flame stabilizing disk (13) is fixed on the inner side of the burner body (1), and an ignition and flame stabilizing integrated needle (17) is arranged on the inner side of the flame stabilizing disk (13).

4. The novel premix burner for industrial furnace according to claim 3 is characterized in that: The solenoid valve (10) is connected to a controller (16), the output end of the controller (16) is electrically connected to an ignition and flame stabilization integrated needle (17), and the input end of the controller (16) is connected to a PLC module (15).

5. The novel premix burner for industrial furnace according to claim 1 is characterized in that: The input end of the air-fuel ratio valve (11) is provided with a fuel pipe for conveying fuel gas, and the fuel pipe is provided with a fuel gas flow valve (5).

6. The novel premix burner for industrial furnace according to claim 5 is characterized in that: The other input end of the air-fuel ratio valve (11) is connected to an air pipe for conveying air, and a first fan (6) is provided at one end of the air pipe.

7. The novel premix burner for industrial furnace according to claim 6 is characterized by: The air pipe is provided with an air flow valve (7) for adjusting the flow rate.

8. The novel premix burner for industrial furnace according to claim 7 is characterized in that: The other input end of the mixer (4) is provided with a connecting pipe (801), and the connecting pipe (801) is provided with a second pressure regulating valve (8), and one end of the connecting pipe (801) is connected to the inside of the air pipe.

9. The novel premix burner for industrial furnace according to claim 1 is characterized by: The burner body (1) is connected to a second fan (14) for supplying air again.

10. The novel premix burner for industrial furnace according to claim 1 is characterized by: A first pressure regulating valve (9) is provided between the solenoid valve (10) and the mixer (4), and the burner body (1) and the mixer (4) are both made of stainless steel.

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