Combustion system of annealing furnace

Abstract

The utility model relates to the technical field of low-nitrogen combustion, in particular to an annealing furnace combustion system which comprises an annealing furnace, a console is arranged on one side of the annealing furnace, the side where the console is located is defined as the front side, a plurality of burners are arranged on the front side, the rear side and the top of the annealing furnace, and gas pipes and air pipes corresponding to the burners are arranged on the annealing furnace. A heat exchanger is arranged on the left side of the console and is connected with the exhaust pipe and an air pipe; the gas pipe and the air pipe are provided with electromagnetic control valves corresponding to the burners, wires are arranged between the electromagnetic control valves and the control console, and a PLC control program is arranged in the control console. The heat exchanger is arranged, so that the system can heat air by utilizing waste heat of flue gas exhausted by the annealing furnace, and the condition of insufficient combustion caused by too low temperature of mixed air is avoided while the energy-saving effect is achieved; in addition, an electromagnetic control valve is arranged so that the system can automatically adjust the mixing proportion of air and fuel gas, and the combustion efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-nitrogen combustion, in particular to an annealing furnace combustion system. Background Art

[0002] Nitrogen oxides (NOx), a major component of air pollution, pose a threat to both the environment and human health. Therefore, reducing NOx emissions has become a key issue in the environmental protection and energy sectors. Low-NOx combustion technology has emerged to reduce NOx production by optimizing the combustion process and equipment, lowering combustion temperatures, and extending combustion times.

[0003] For example, the Chinese patent document with the authorization announcement number CN106594716B discloses a self-cooling low-nitrogen combustion device with a flue gas premixing tube bundle and a combustion method thereof. The device is provided with a gas pipeline, a blower, and a self-cooling low-nitrogen burner with a flue gas premixing tube bundle; the blower air inlet is connected to a flue gas mixer, the blower outlet is connected to a flue gas mixing pipe, and the flue gas mixing pipe is connected to a flue gas mixing ejector; the low-nitrogen burner is provided with an air sleeve, a main gas nozzle is provided in the air sleeve, a circle of flue gas mixing cooling tube bundle is provided around the main gas nozzle, and the flue gas mixing cooling tube bundle directly extends into the furnace; an ignition gun is provided on the burner; a flue gas mixing inlet is provided on the air sleeve; the rear end of the main gas nozzle is connected to a high-fire gas pipeline with a high-fire valve and a low-fire gas pipeline with a low-fire valve respectively; a flame detector is provided at the end of the ignition gun; the device ensures low nitrogen oxide emissions from the gas boiler.

[0004] However, the above device also has certain defects: the above device reduces the oxygen concentration in the combustion chamber by re-inhaling the exhausted exhaust gas into the combustion chamber, thereby reducing the temperature of the combustion chamber and thus reducing the generation of nitrogen oxides. However, the proportion of the mixed air in the device is manually controlled, and the temperature of the mixed air is low when it enters the combustion chamber. An unbalanced proportion or a low temperature of the mixed air can easily cause incomplete combustion. Utility Model Content

[0005] The utility model provides an annealing furnace combustion system to solve the technical problem in a low-nitrogen combustion system that inaccurate mixed air ratio and low mixed air temperature cause insufficient combustion and thus increase nitrogen oxide emissions.

[0006] In order to solve the above problems, the utility model provides an annealing furnace combustion system adopting the following technical solutions:

[0007] An annealing furnace combustion system includes an annealing furnace, a control console is provided on one side of the annealing furnace, and the side where the control console is located is defined as the front side. The annealing furnace has multiple burners on the front and rear sides and the top of the annealing furnace. The annealing furnace is provided with a gas pipe and an air pipe corresponding to each burner to provide gas and air to the burners. The top of the annealing furnace is also provided with an exhaust pipe. A heat exchanger is provided on the left side of the control console, and the heat exchanger is connected to the exhaust pipe and the air pipe to heat the air with the waste heat of the gas discharged from the annealing furnace; the gas pipe and the air pipe are provided with an electromagnetic control valve corresponding to each burner, and a wire is provided between the electromagnetic control valve and the control console. A PLC control program is provided in the control console so that the control console can adjust the gas flow inside the gas pipe and the air pipe through the PLC control program.

[0008] Its beneficial effects are: by setting up a heat exchanger, the system can use the waste heat of the flue gas discharged from the annealing furnace to heat the air, which not only saves energy but also avoids the occurrence of incomplete combustion caused by the low temperature of the mixed air; in addition, the electromagnetic control valve is set up so that the system can automatically adjust the mixing ratio of air and gas, thereby improving combustion efficiency and further reducing the emission of nitrogen oxides during the combustion process.

[0009] Furthermore, the exhaust pipe is located at the right end of the heat exchanger, and the left end of the heat exchanger is provided with an exhaust pipe for discharging the flue gas after heat exchange, and a fan is provided on the exhaust pipe.

[0010] Furthermore, an air supply pipe is provided on the left side of the top end of the heat exchanger, and a second fan is provided at the left end of the air supply pipe to pump air into the heat exchanger; the air pipe is located on the right side of the top end of the heat exchanger.

[0011] Furthermore, the air pipe is provided with an air branch pipe corresponding to each burner, and the gas pipe is provided with a gas branch pipe corresponding to each burner, and the electromagnetic control valve is located on the air branch pipe and the gas branch pipe.

[0012] Furthermore, a booster fan is provided at the front end of the annealing furnace, and a gas pipe is connected to the rear side of the booster fan so that there is a stable gas pressure in the gas pipe. A gas supply pipe is provided on the right side of the booster fan.

[0013] The beneficial effect is that the setting of the booster fan can ensure the stability of the gas pressure, and thus ensure the stability of the mixed air ratio in the burner.

[0014] Furthermore, a monitor is provided at the right end of the annealing furnace, and a control panel is provided on the control console to display the combustion conditions in the annealing furnace in real time.

[0015] The beneficial effect is that the arrangement of the monitor and the control panel facilitates the operator to check the combustion conditions in the annealing furnace, thereby improving the convenience of operation.

[0016] Furthermore, the gas pipe is provided with exhaust pipes extending left and right to discharge the waste gas accumulated in the pipe.

[0017] Furthermore, the burners on the front and rear sides of the annealing furnace are open flame burners, and the burner on the top of the annealing furnace is a flat flame burner.

[0018] Furthermore, a plurality of temperature sensors are provided on the top of the annealing furnace, a gas detector is provided on the exhaust pipe, and flow meters and pressure gauges are provided on the gas pipe and the air pipe to feed back system data to the control console.

[0019] The beneficial effects of the annealing furnace combustion system provided by the utility model are:

[0020] 1. By setting up a heat exchanger, the system can use the waste heat of the flue gas discharged from the annealing furnace to heat the air, which not only saves energy but also avoids the occurrence of incomplete combustion caused by the low temperature of the mixed air. In addition, the electromagnetic control valve is set up so that the system can automatically adjust the mixing ratio of air and gas, improve the combustion efficiency, and further reduce the emission of nitrogen oxides during the combustion process.

[0021] 2. The setting of the booster fan can ensure the stability of the gas pressure, and thus ensure the stability of the mixed air ratio in the burner.

[0022] 3. The setting of the monitor and control panel makes it easy for operators to check the combustion conditions in the annealing furnace, thus improving the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0024] Figure 1 This is a structural diagram of an annealing furnace combustion system provided by the utility model;

[0025] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0026] Figure 3 for Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0027] Figure 4 for Figure 1 A partial enlarged schematic diagram of point C in the middle.

[0028] Description of reference numerals:

[0029] 1. Annealing furnace; 11. Exhaust pipe; 111. Gas detector; 12. Temperature sensor; 13. Monitor; 2. Control console; 21. Control panel; 3. Air supply assembly; 31. Heat exchanger; 32. Air pipe; 321. Flow meter; 322. Pressure gauge; 323. Air branch pipe; 33. Air supply pipe; 34. Fan 1; 35. Fan 2; 36. Smoke exhaust pipe; 4. Gas assembly; 41. Gas pipe; 411. Gas branch pipe; 42. Booster fan; 43. Gas supply pipe; 5. Exhaust pipe; 6. Burner; 61. Flat flame burner; 62. Open flame burner; 7. Solenoid control valve; 8. Wires. DETAILED DESCRIPTION

[0030] 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. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0031] The main idea of ​​the present invention is to provide a heat exchanger 31 so that the system can use the waste heat of the flue gas discharged from the annealing furnace 1 to heat the air, thereby achieving energy saving while avoiding the occurrence of incomplete combustion caused by the mixed air temperature being too low; in addition, the electromagnetic control valve 7 is provided so that the system can automatically adjust the mixing ratio of air and gas, thereby improving the combustion efficiency and further reducing the emission of nitrogen oxides during the combustion process.

[0032] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. The numbers of any elements in the drawings are for illustration only and not for limitation, and any names are for distinction only and do not have any limiting meaning.

[0033] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0034] Example 1 of an annealing furnace combustion system provided by the present invention:

[0035] like Figures 1 to 4 As shown, the system includes an annealing furnace 1, a control console 2 is provided on one side of the annealing furnace 1, and the side where the control console 2 is located is defined as the front side. A plurality of burners 6 are provided on the annealing furnace 1, wherein the burners 6 located on the front and rear sides of the annealing furnace 1 are open flame burners 62, and the burner 6 located on the annealing furnace 1 is a flat flame burner 61. An air supply assembly 3 is provided on the front side of the annealing furnace 1 and on the left side of the control console 2. The air supply assembly 3 is used to provide air to each burner 6. A gas assembly 4 is provided between the air supply assembly 3 and the control console 2. The gas assembly 4 is used to provide gas to each burner 6.

[0036] The following first introduces the air supply assembly 3, which includes a fan 34 located at the front side of the annealing furnace 1. The right end of the fan 34 is provided with an air supply pipe 33, and the right end of the air supply pipe 33 is provided with a heat exchanger 31. The heat exchanger 31 is a rectangular structure. The air supply pipe 33 is connected to the left side of the top of the heat exchanger 31, and the right side of the top of the heat exchanger 31 is provided with an air pipe 32 to provide heated air to the burner 6; the top of the annealing furnace 1 is provided with an exhaust pipe 11, the exhaust pipe 11 is connected to the right end of the heat exchanger 31, and the left end of the heat exchanger 31 is provided with a smoke exhaust pipe 36, and the smoke exhaust pipe 36 is provided with a fan 2 35 to discharge the smoke after heat exchange; the air pipe 32 has a plurality of air branch pipes 323 corresponding to each burner 6, and each air branch pipe 323 is provided with an electromagnetic control valve 7 to control the gas flow in each air branch pipe 323 through the console 2.

[0037] Next, the gas assembly 4 is introduced. The gas assembly 4 includes a booster fan 42 located on the right side of the heat exchanger 31. The booster fan 42 is used to ensure the stability of the gas pressure. A gas supply pipe 43 is provided on the right side of the booster fan 42. A gas pipe 41 is provided on the rear side of the booster fan 42. The gas pipe 41 has multiple gas branch pipes 411 corresponding to each burner 6. Each gas branch pipe 411 is provided with an electromagnetic control valve 7 to control the gas flow in each gas branch pipe 411 through the control console 2; the gas pipe 41 is also provided with an exhaust pipe 5 extending left and right to discharge the exhaust gas accumulated in the pipeline.

[0038] The console 2 is provided with a PLC control program, and wires 8 are provided between each electromagnetic control valve 7, fan 1 34, fan 2 35, heat exchanger 31 and booster fan 42 and the console 2, so that the console 2 controls each component through the PLC control program. In addition, a plurality of temperature sensors 12 are provided on the top of the annealing furnace 1, a flow meter 321 and a pressure gauge 322 are provided on the gas pipe 41 and the air pipe 32, and a gas detector 111 is provided on the exhaust pipe 11 to feedback the system operation status to the console 2; a monitor 13 is provided at the right end of the annealing furnace 1, and a control screen 21 is provided on the console 2 to display the combustion status in the annealing furnace 1 in real time.

[0039] The working principle of the system is as follows: first, before the system is started, nitrogen is input into the gas pipe 41 through the exhaust pipe 5 to remove the exhaust gas in the gas tank, and then the control console controls the air supply component 3 and the gas component 4 to input air and gas into the air pipe 32 and the gas pipe 41, and then the burner 6 ignition self-test is performed. After the self-test is completed, the console 2 controls the ignition of the burner 6 to increase the furnace temperature in the annealing furnace 1. At this time, the console 2 adjusts itself according to the feedback data of the gas detector 111, the temperature sensor 12, the flow meter 321 and the pressure gauge 322, and controls the flow of the air pipe 32 and the gas pipe 41 according to the furnace temperature to achieve precise air distribution.

[0040] Example 2 of an annealing furnace combustion system provided by the present invention:

[0041] The main difference between it and Example 1 is:

[0042] In Example 1, the console is connected to the electromagnetic control valve via a wire.

[0043] In this embodiment, the console is connected to the electromagnetic control valve via radio frequency control.

[0044] Example 3 of an annealing furnace combustion system provided by the present invention:

[0045] The main difference between it and Example 1 is:

[0046] In Example 1, the system uses a booster fan to provide gas pressure.

[0047] In this embodiment, the system uses a screw blower to provide gas pressure.

[0048] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and other terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the drawings of this specification. They are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0049] In addition, in the description of this specification, “a plurality of” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. An annealing furnace combustion system, comprising an annealing furnace, a control console on one side of the annealing furnace, the side where the control console is located being defined as the front side, a plurality of burners on the front and rear sides of the annealing furnace and on the top of the annealing furnace, a gas pipe and an air pipe being provided on the annealing furnace corresponding to each burner to supply gas and air to the burners, and an exhaust pipe being provided on the top of the annealing furnace, characterized in that: A heat exchanger is provided on the left side of the console, which is connected to the exhaust pipe and the air pipe to heat the air with the waste heat of the gas discharged from the annealing furnace; the gas pipe and the air pipe are provided with electromagnetic control valves corresponding to each burner, and a wire is provided between the electromagnetic control valve and the console. A PLC control program is provided in the console to enable the console to adjust the gas flow inside the gas pipe and the air pipe through the PLC control program.

2. The annealing furnace combustion system according to claim 1, characterized in that: The exhaust pipe is located at the right end of the heat exchanger, and the left end of the heat exchanger is provided with an exhaust pipe for discharging the flue gas after heat exchange, and a fan is provided on the exhaust pipe.

3. The annealing furnace combustion system according to claim 2, characterized in that: An air supply pipe is provided on the left side of the top end of the heat exchanger, and a second fan is provided at the left end of the air supply pipe to pump air into the heat exchanger; the air pipe is located on the right side of the top end of the heat exchanger.

4. The annealing furnace combustion system according to claim 3, characterized in that: The air pipe is provided with an air branch pipe corresponding to each burner, and the gas pipe is provided with a gas branch pipe corresponding to each burner. The electromagnetic control valve is located on the air branch pipe and the gas branch pipe.

5. The annealing furnace combustion system according to claim 4, characterized in that: A booster fan is provided at the front end of the annealing furnace, and a gas pipe is connected to the rear side of the booster fan so that the gas pipe has a stable gas pressure. A gas delivery pipe is provided on the right side of the booster fan.

6. The annealing furnace combustion system according to claim 5, characterized in that: A monitor is provided at the right end of the annealing furnace, and a control panel is provided on the control console to display the combustion conditions in the annealing furnace in real time.

7. The annealing furnace combustion system according to claim 6, characterized in that: The gas pipe is provided with exhaust pipes extending left and right to discharge the waste gas accumulated in the pipe.

8. The annealing furnace combustion system according to claim 7, characterized in that: The burners on the front and rear sides of the annealing furnace are open flame burners, and the burner on the top of the annealing furnace is a flat flame burner.

9. The annealing furnace combustion system according to claim 8, characterized in that: The top of the annealing furnace is provided with multiple temperature sensors, the exhaust pipe is provided with a gas detector, and the gas pipe and the air pipe are both provided with flow meters and pressure gauges to feed back system data to the control console.

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