Environment-friendly low-nitrogen combustion device for forging and use method thereof

Abstract

The application provides an environment-friendly low-nitrogen combustion device for forging and a use method thereof, and relates to the field of flange forging.The device comprises a forging bin, a placing table and a sealing door.The top of the forging bin is provided with a driving assembly for moving the sealing door.The inside of the forging bin is provided with the placing table for placing forgings.The bottom and both sides of the placing table are provided with grids.The forging bin is provided with a combustion cavity.The side walls on both sides of the forging bin are provided with multiple groups of burners.The inside of the forging bin is further provided with a cooling bin above the placing table for cooling flue gas.The application cools flue gas to reduce the emission temperature of flue gas, thereby reducing the reaction of nitrogen and oxygen in air at high temperature to generate nitrogen oxides, and the waste heat of flue gas can be utilized to further reduce the production cost of the whole industry.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flange forging technology, and particularly relates to an environment-friendly low-nitrogen combustion device for forging and a use method thereof. BACKGROUND

[0002] The natural gas forging furnace is an industrial equipment which uses natural gas as fuel to generate high temperature by combustion to heat and forge metal, and is widely applied in metal processing (such as forging, heat treatment, etc.);

[0003] In order to further increase the environmental protection performance of the natural gas forging furnace in use, the present application provides an environment-friendly low-nitrogen combustion device for forging and a use method thereof to solve the problems in the prior art. SUMMARY

[0004] In view of the above problems, the present application provides an environment-friendly low-nitrogen combustion device for forging, which cools the flue gas to reduce the flue gas emission temperature, thereby reducing the generation of thermal nitrogen oxides, and can utilize the waste heat of the flue gas to further reduce the production cost of the entire industry.

[0005] In order to achieve the purpose of the present application, the present application realizes the following technical scheme: an environment-friendly low-nitrogen combustion device for forging, comprising a forging bin, a placing table and a sealing door, the top of the forging bin is provided with a driving assembly for moving the sealing door, the inside of the forging bin is provided with a placing table for placing forgings, the bottom and both sides of the placing table are provided with grids, the forging bin is provided with a combustion cavity, a plurality of groups of burners are arranged on the side walls of both sides of the forging bin, the inside of the forging bin is further provided with a cooling bin for cooling flue gas above the placing table, a smoke exhaust plate is arranged between the forging bin and the cooling bin, and a smoke exhaust pipe is arranged above the cooling bin.

[0006] Further improvement lies in that the burner comprises an outer shell, a fan, a gas pipe, a flue gas return pipe, a combustion-supporting gas delivery pipe and an ignition needle, one side of the outer shell is provided with the fan for delivering air into the outer shell, the other side of the outer shell is provided with the combustion-supporting gas delivery pipe in communication with the combustion cavity, the gas pipe is arranged on the outer shell below the fan, one end of the gas pipe is in communication with the combustion cavity, the upper side of the end of the gas pipe in communication with the combustion cavity is provided with the ignition needle, the top of the outer shell is provided with the flue gas return pipe, and one end of the flue gas return pipe is in communication with the cooling bin through a connecting assembly.

[0007] Further improvement lies in that the part of the gas pipe located in the outer shell is in a spiral shape, and the part of the gas pipe located in the outer shell is made of stainless steel.

[0008] Further improvement lies in that electromagnetic metering valves are arranged on the gas pipe and the flue gas return pipe, and a temperature sensing electromagnetic valve is arranged at the end of the gas pipe close to the combustion chamber.

[0009] Further improvement lies in that the cooling bin is in the shape of an inverted isosceles trapezoid, and the cooling bin is internally provided with a cooling pipe group.

[0010] Further improvement lies in that the cooling pipe group is composed of a plurality of groups of longitudinally arranged U-shaped pipes, and water pipes are communicated with both ends of the cooling pipe group, and the water pipes are communicated with external cold and hot water storage tanks.

[0011] Further improvement lies in that the connecting assembly comprises a conveying bin, one end of the conveying bin is communicated with the cooling bin, and the other end is communicated with the flue gas return pipe.

[0012] Further improvement lies in that the driving assembly comprises a fixed plate and an electric telescopic rod, the fixed plate is fixedly connected with the forging bin, the electric telescopic rods are symmetrically arranged on the fixed plate, and the electric telescopic rods are fixedly connected with the top of the sealing door.

[0013] The above-mentioned combustion method of the environment-friendly low-nitrogen combustion device for forging comprises the following contents.

[0014] S1, the sealing door is driven to rise and fall by the electric telescopic rod, so as to open or close the forging bin, thereby placing or taking out the forgings;

[0015] S2, after the forgings are placed on the placing table, the sealing door is closed, then the burner sends natural gas, air and mixed gas of flue gas into the combustion chamber, and ignites by the ignition needle, so that the natural gas burns, and the flame passes through the grid to calcine the forgings on the placing table;

[0016] S3, the flue gas generated by combustion enters the cooling bin through the smoke exhaust plate, so as to cool the flue gas, at the same time, the conveying bin absorbs part of the flue gas and sends it into the burner to mix with the combustion air, at the same time, the amount of flue gas sent is controlled by the electromagnetic metering valve, so as to prevent the flue gas from being too high, and the flue gas not used in circulation is discharged to the flue gas exhaust pipe after being cooled by the cooling pipe group;

[0017] S4, the flue gas used in circulation enters the burner, mixes with air, and preheats the gas in the gas pipe, so as to improve the combustion efficiency, and the temperature sensing electromagnetic valve arranged in the gas pipe can monitor the temperature in the pipe.

[0018] The beneficial effects of this invention are as follows: By cooling the flue gas, the emission temperature of the flue gas is reduced, thereby reducing the generation of thermal nitrogen oxides. Simultaneously, the waste heat of the flue gas can be utilized, further reducing production costs across the entire industry. Furthermore, this device mixes the fuel gas and combustion-supporting gas in the combustion chamber, further ensuring combustion uniformity and avoiding localized high temperatures or high oxygen levels, further reducing nitrogen oxide generation. External air is drawn into the burner by a fan, while the flue gas return pipe ensures flue gas recirculation. The recirculated flue gas is premixed with air in the burner, increasing the air temperature and preheating the fuel gas in the combustion pipe, further increasing the combustion efficiency of natural gas. It also shortens the high-temperature flame residence time (e.g., preheating the fuel gas temperature from 25°C to 200°C), enhancing the controllability of the peak combustion temperature and reducing the generation window of thermal nitrogen oxides. Combined with staged combustion technology, the preheated fuel gas promotes uniform premixing of fuel and air in the combustion chamber, further avoiding the generation of localized high-temperature zones. The fully combusted natural gas also reduces PM2.5 / PM10 emissions. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the sealed door of the present invention after it is opened;

[0021] Figure 3 This is a front sectional view of the present invention;

[0022] Figure 4 This is a schematic diagram of the internal structure of the burner of the present invention;

[0023] Figure 5 This is a schematic diagram of the cooling pipe assembly of the present invention.

[0024] The components include: 1. Forging chamber; 2. Placement platform; 3. Sealed door; 4. Grid; 5. Combustion chamber; 6. Cooling chamber; 7. Smoke exhaust plate; 8. Smoke exhaust pipe; 9. Outer shell; 10. Fan; 11. Gas pipe; 12. Flue gas return pipe; 13. Combustion gas delivery pipe; 14. Ignition needle; 15. Electromagnetic metering valve; 16. Temperature sensing solenoid valve; 17. Cooling pipe assembly; 18. Water pipe; 19. Delivery chamber; 20. Fixing plate; 21. Electric telescopic rod. Detailed Implementation

[0025] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0026] according to Figures 1-5As shown, the embodiment proposes an environment-friendly low-nitrogen combustion device for forging, which comprises a forging bin 1, a placing table 2 and a sealing door 3, the top of the forging bin 1 is provided with a driving assembly for moving the sealing door 3, the inside of the forging bin 1 is provided with the placing table 2 for placing forgings, the bottom and both sides of the placing table 2 are provided with grids 4, the forging bin 1 is provided with a combustion cavity 5, the side walls on both sides of the forging bin 1 are provided with multiple groups of burners, the inside of the forging bin 1 is further provided with a cooling bin 6 for cooling flue gas above the placing table 2, the forging bin 1 and the cooling bin 6 are provided with a flue gas discharge plate 7, and the upper part of the cooling bin 6 is provided with a flue gas discharge pipe 8. The flue gas is cooled to reduce the flue gas emission temperature, thereby reducing the generation of thermal nitrogen oxides, and the waste heat of the flue gas can be utilized to further reduce the production cost of the entire industry. Meanwhile, the device mixes the fuel gas and the combustion-supporting gas through the combustion cavity 5 to further ensure the uniformity of combustion, avoid local high temperature or high oxygen, and further reduce the generation of nitrogen oxides.

[0027] The burner comprises an outer shell 9, a fan 10, a fuel gas pipe 11, a flue gas backflow pipe 12, a combustion-supporting gas delivery pipe 13 and an ignition needle 14, one side of the outer shell 9 is provided with the fan 10 for delivering air into the inner part of the outer shell 9, the other side of the outer shell 9 is provided with the combustion-supporting gas delivery pipe 13 in communication with the combustion cavity 5, the lower part of the outer shell 9 body is provided with the fuel gas pipe 11, one end of the fuel gas pipe 11 is in communication with the combustion cavity 5, the upper part of the end of the fuel gas pipe 11 in communication with the combustion cavity 5 is provided with the ignition needle 14, the top of the outer shell 9 is provided with the flue gas backflow pipe 12, and one end of the flue gas backflow pipe 12 is in communication with the cooling bin 6 through a connecting assembly.

[0028] The fan 10 sucks external air into the inside of the burner, and the flue gas backflow pipe 12 ensures the backflow of flue gas. The backflow of flue gas is premixed with air in the burner, which increases the temperature of air, and the flue gas also preheats the fuel gas in the fuel gas pipe 11, further increasing the combustion efficiency of natural gas, shortening the high-temperature flame residence time, such as preheating the fuel gas temperature from 25℃ to 200℃, enhancing the controllability of the combustion peak temperature, reducing the generation window period of thermal NOx, and combining with the staged combustion technology to promote the premixing uniformity of fuel and air in the combustion cavity 5, further avoiding the generation of local high-temperature zones, and the fully combusted natural gas also reduces PM2.5 / PM10 emissions.

[0029] The part of the fuel gas pipe 11 inside the outer shell 9 is in a spiral shape, the part of the fuel gas pipe 11 inside the outer shell 9 is made of stainless steel, the spiral structure increases the heating area of the fuel gas pipe 11, and the stainless steel material can ensure heat conduction at high temperature, and also has the characteristics of corrosion resistance and low cost.

[0030] The electromagnetic metering valve 15 is arranged on the gas pipe 11 and the flue gas return pipe 12, and the temperature sensing electromagnetic valve 16 is arranged at the end of the gas pipe 11 close to the combustion cavity 5.

[0031] The electromagnetic metering valve 15 ensures the concentration of the flue gas return, and prevents the flue gas from mixing with air to have a high proportion.

[0032] The cooling bin 6 is an inverted isosceles trapezoid, and the cooling bin 6 is internally provided with a cooling pipe group 17.

[0033] The cooling pipe group 17 is composed of a plurality of groups of longitudinally arranged U-shaped pipes, the number of the U-shaped pipes can be controlled to be 15-20, and the two ends of the cooling pipe group 17 are communicated with water pipes 18, and the water pipes 18 are communicated with external cold and hot water storage tanks.

[0034] The cooling pipe group 17 is formed by the communication of a plurality of groups of U-shaped pipes, the contact area with the flue gas is increased, the heat of the flue gas is utilized, and cold water flows in the cooling pipe group 17, after being heated by the flue gas, the hot water can be used for washing and washing of workers, and can also provide floor heating service for workers or residents, thereby reducing the production cost of the whole production.

[0035] The connecting assembly includes a conveying bin 19, one end of the conveying bin 19 is communicated with the cooling bin 6, and the other end is communicated with the flue gas return pipe 12.

[0036] The driving assembly includes a fixed plate 20 and an electric telescopic rod 21, the fixed plate 20 is fixedly connected with the forging bin 1, the electric telescopic rod 21 is symmetrically arranged on the fixed plate 20, and the electric telescopic rod 21 is fixedly connected with the top of the sealing door 3.

[0037] The sealing door 3 is driven to move up and down by the electric telescopic rod 21, so as to open and close the forging bin 1.

[0038] The above-mentioned environment-friendly low-nitrogen combustion device for forging includes the following contents in the combustion method.

[0039] S1, the sealing door 3 is driven to rise and fall by the electric telescopic rod 21, so as to open or close the forging bin 1, so as to place or take out the forgings;

[0040] S2, after the forgings are placed on the placing table 2, the sealing door 3 is closed, then the burner sends natural gas, air and mixed gas of flue gas into the combustion cavity 5, and the ignition needle 14 is ignited, so that the natural gas is burned, and the flame passes through the grid to calcine the forgings on the placing table 2;

[0041] S3, the flue gas generated by combustion enters the cooling bin 6 through the exhaust gas plate 7, so as to cool the flue gas, at the same time, the conveying bin 19 absorbs part of the flue gas and sends it into the burner and mixes with the combustion air, at the same time, the amount of flue gas sent is controlled through the electromagnetic metering valve 15, so as to prevent the flue gas from being too high, and the flue gas not used in circulation is cooled through the cooling pipe group 17 and then discharged to the exhaust gas pipe 8;

[0042] S4, the flue gas used in circulation enters the burner and is mixed with air to preheat the gas in the gas pipe 11, so as to improve the combustion efficiency, and the temperature sensing electromagnetic valve 16 is arranged in the gas pipe 11 to monitor the temperature in the pipe.

[0043] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly low-nitrogen combustion device for forging, comprising a forging bin (1), a placing table (2) and a sealing door (3), characterized in that: The top of the forging bin (1) is provided with a driving assembly for moving the sealing door (3), the inside of the forging bin (1) is provided with a placing table (2) for placing forgings, the bottom and both sides of the placing table (2) are provided with grids (4), the forging bin (1) is provided with a combustion cavity (5), the sidewalls on both sides of the forging bin (1) are provided with a plurality of burners, the inside of the forging bin (1) is further provided with a cooling bin (6) for cooling flue gas above the placing table (2), the forging bin (1) and the cooling bin (6) are provided with a flue gas discharge plate (7), and the top of the cooling bin (6) is provided with a flue gas discharge pipe (8). The burner comprises an outer shell (9), a fan (10), a gas pipe (11), a flue gas return pipe (12), a combustion-supporting gas delivery pipe (13) and an ignition needle (14), one side of the outer shell (9) is provided with the fan (10) for delivering air into the outer shell (9), the other side of the outer shell (9) is provided with the combustion-supporting gas delivery pipe (13) in communication with the combustion cavity (5), the outer shell (9) below the fan (10) is provided with the gas pipe (11), one end of the gas pipe (11) is in communication with the combustion cavity (5), the top of the end of the gas pipe (11) in communication with the combustion cavity (5) is provided with the ignition needle (14), and the top of the outer shell (9) is provided with the flue gas return pipe (12) in communication with the cooling bin (6) through a connecting assembly. The cooling bin (6) is an inverted isosceles trapezoid, and the inside of the cooling bin (6) is provided with a cooling pipe group (17). The cooling pipe group (17) is composed of a plurality of longitudinally arranged U-shaped pipes, and both ends of the cooling pipe group (17) are in communication with water pipes (18) in communication with external cold and hot water storage tanks.

2. The low-nitrogen environmental-friendly combustion device for forging according to claim 1, characterized in that: The part of the gas pipe (11) inside the outer shell (9) is spiral-shaped, and the part of the gas pipe (11) inside the outer shell (9) is made of stainless steel.

3. The environmentally friendly low-nitrogen combustion device for forging according to claim 2, characterized in that: The gas pipe (11) and the flue gas return pipe (12) are both provided with electromagnetic metering valves (15), and the end of the gas pipe (11) close to the combustion cavity (5) is further provided with a temperature sensing electromagnetic valve (16).

4. The environmentally friendly low-nitrogen combustion device for forging according to claim 3, characterized in that: The connecting assembly comprises a delivery bin (19), one end of the delivery bin (19) is in communication with the cooling bin (6), and the other end is in communication with the flue gas return pipe (12).

5. The environmentally friendly low-nitrogen combustion device for forging according to claim 4, characterized in that: The driving assembly comprises a fixed plate (20) and an electric telescopic rod (21), the fixed plate (20) is fixedly connected with the forging bin (1), the fixed plate (20) is symmetrically provided with the electric telescopic rod (21), and the electric telescopic rod (21) is fixedly connected with the top of the sealing door (3).

6. A method of using the environmentally friendly low-nitrogen combustion device for forging according to claim 5, characterized in that: The following is included; S1, the sealing door (3) is lifted by the electric telescopic rod (21), so that the forging bin (1) is opened or closed, so that the forgings are placed or taken out; S2, after the forging is placed on the placing table (2), the sealing door (3) is closed, then natural gas and mixed gas of air and flue gas are sent into the combustion cavity (5) through the burner, ignited by the ignition needle (14), so that the natural gas burns, and the flame passes through the grid to calcine the forging on the placing table (2); S3, the flue gas generated by combustion enters the cooling bin (6) through the exhaust plate (7), so as to cool the flue gas, at the same time, the conveying bin (19) absorbs part of the flue gas and sends it into the burner to mix with the combustion air, at the same time, the amount of flue gas sent is controlled by the electromagnetic metering valve (15), so as to prevent the flue gas from being too high, and the flue gas not used in circulation is cooled by the cooling pipe group (17) and then discharged to the exhaust pipe (8); S4, the flue gas used in circulation enters the burner, mixes with air, and preheats the gas in the gas pipe (11), so as to improve the combustion efficiency, and the temperature sensing electromagnetic valve (16) is arranged in the gas pipe (11), which can monitor the temperature in the pipe.

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