CN210314405U

CN210314405U - Device for controlling generation of NOx

Info

Publication number: CN210314405U
Application number: CN201920700405.4U
Authority: CN
Inventors: 商存亮; 张学成; 常志禄
Original assignee: Anyang Iron and Steel Co Ltd
Current assignee: Anyang Iron and Steel Co Ltd
Priority date: 2019-04-18
Filing date: 2019-05-16
Publication date: 2020-04-14
Anticipated expiration: 2029-05-16

Abstract

The utility model discloses a device that control NOx generated, include the oven, go up the radiant tube, lower radiant tube and air takeover, it is in to go up radiant tube fixed mounting the upper end of oven, the one end of going up the radiant tube is connected with the air through pipe connecting part and takes over, the one end that the air was taken over is passed through pipe connecting part is connected with lower radiant tube, the inside fixed mounting of radiant tube has the blender, one side fixed mounting of blender has the coal gas to take over, the one end that the coal gas was taken over is passed go up the radiant tube and extend to go up the outside of radiant tube, the inside top fixed mounting of air takeover has the connecting pipe, the top of connecting pipe with the one end of going up the radiant tube bottom communicates each other, just the bottom fixed mounting of connecting pipe has NOx to generate controlling means. The utility model discloses a set up a series of structures and make this device can effectual control NOx's formation and low in cost's characteristics.

Description

Device for controlling generation of NOx

Technical Field

The utility model relates to a cold rolling annealing stove fume emission technical field, concretely relates to device that NOx generated in the annealing stove radiant tube nozzle control combustion process.

Background

At present, most of cold rolling annealing furnaces in use have smoke emission which barely meets special emission standards and cannot meet ultralow emission standards. The large-scale reconstruction of the annealing furnace which is invested with huge capital can cause enterprises to bear too large economic burden, and moreover, the effect is difficult to ensure without mature cases.

The annealing furnace of the continuous annealing unit adopts a W-shaped radiant tube burner for heating, the furnace temperature is controlled within the range of 900-930 ℃, the fuel is coke oven gas, the components of the coke oven gas are relatively complex, the coke oven gas contains about 60 percent of hydrogen and 6.6 percent of nitrogen, contains a certain amount of organic nitrides such as HCN, NH3 and the like, burning in a closed radiant tube, limited space, easy generation of local high temperature and easy generation of NOx, the NOx emission in flue gas can not meet special emission standard (NOx is less than 300mg/m 3) and can not meet ultra-low emission standard (NOx is less than 150mg/m 3), the annealing furnace has large modification difficulty, immature technology and high investment cost, partial burners are required to be modified and tested, to verify the feasibility of large-scale reconstruction, in order to reduce the reconstruction risk, save the investment cost, meet the requirements of environmental protection and discharge reaching standards, therefore, to solve this series of problems we propose a solution to the device for controlling NOx formation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a device that control NOx generated to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a device for controlling NOx generation comprises a furnace wall, an upper radiant tube, a lower radiant tube and an air connecting tube, wherein the upper radiant tube is fixedly arranged at the upper end of the furnace wall, the upper radiant tube penetrates through the furnace wall and is perpendicular to the furnace wall, one end of the upper radiant tube is connected with the air connecting tube through a pipeline connecting part, the air connecting tube is perpendicular to the upper radiant tube, one end of the air connecting tube is connected with the lower radiant tube through the pipeline connecting part, the lower radiant tube is perpendicular to the air connecting tube, the lower radiant tube is fixedly arranged at the lower end of the furnace wall, the lower radiant tube penetrates through the furnace wall and is perpendicular to the furnace wall, a mixer is fixedly arranged inside the radiant tube, a gas connecting tube is fixedly arranged on one side of the mixer, one end of the gas connecting tube penetrates through the upper radiant tube and extends to the outer side of the upper radiant tube, and the one end movable mounting of coal gas takeover has the valve, the inside top fixed mounting of air takeover has the connecting pipe, the top of connecting pipe with the one end of radiant tube bottom communicates each other, just the bottom fixed mounting of connecting pipe has NOx to generate controlling means, just the connecting pipe with NOx generates controlling means and passes through the pipe seal circle and connect, NOx generates controlling means's bottom fixed mounting has the gas-supply pipe, the inside fixed mounting of radiant tube has the heat exchanger down, the one end of heat exchanger is passed through the gas-supply pipe is connected NOx generates controlling means.

Preferably, one end of the lower radiant tube is provided with a cool air inlet.

Preferably, one end of the bottom of the lower radiant tube is provided with a flue gas outlet.

Preferably, the radiant tube and the lower radiant tube are fixedly arranged on the furnace wall through a pipeline fixing part.

Preferably, the NOx generation control device is composed of an inner tube and a mounting head, and mounting holes are formed at four ends of the mounting head.

Preferably, the NOx production control device has an oblate ring shape, is made of stainless steel SUS309, and has an inner diameter of 71mm, an outer diameter of 123mm, and a thickness of 3 mm.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model has the advantages of being scientific and reasonable in structure, convenience safe in utilization, this novel device that control NOx generated is that technical staff independently develops, makes, has to make advantages such as use cost low, simple installation, flexibility, swift, high efficiency, labour saving and time saving, safe and reliable. Only 30 yuan is needed for one device, and about 2000 ten thousand yuan of reconstruction investment is saved.

The device greatly reduces the index of NOx discharged by the annealing furnace from the time of use, and realizes ultralow emission when the hour average value is less than 150mg/m3 during normal production. The mean NOx value is reduced from 305 mg/m3 to 135 mg/m3, and the reduction rate is 55.7 percent.

Drawings

Fig. 1 is a schematic view of the position of the present invention in a radiant tube burner;

FIG. 2 is a schematic structural view of a NOx generation control apparatus of the present invention;

fig. 3 is a cross-sectional view of the NOx generation control device of the present invention.

In the figure: 1. a furnace wall; 2. a pipe fixing member; 3. an upper radiant tube; 4. a pipe connecting member; 5. a gas connecting pipe; 6. a valve; 7. a connecting pipe; 8. a pipeline sealing ring; 9. NOx generation control means; 10. a gas delivery pipe; 11. a cool air inlet; 12. a flue gas outlet; 13. a lower radiant tube; 14. a heat exchanger; 15. a mixer; 16. an air connection pipe; 17. mounting holes; 91. an inner tube; 92. and (5) mounting the head.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: a technical scheme of a device for controlling NOx generation comprises a furnace wall 1, an upper radiant tube 3, a lower radiant tube 13 and an air connecting tube 16, wherein the radiant tube 3 is fixedly arranged at the upper end of the furnace wall 1, the radiant tube 3 penetrates through the furnace wall 1, the radiant tube 3 is perpendicular to the furnace wall 1, one end of the radiant tube 3 is connected with the air connecting tube 16 through a pipeline connecting part 4, the air connecting tube 16 is perpendicular to the upper radiant tube 3, one end of the air connecting tube 16 is connected with the lower radiant tube 13 through the pipeline connecting part 4, the lower radiant tube 13 is perpendicular to the air connecting tube 16, the lower radiant tube 13 is fixedly arranged at the lower end of the furnace wall 1, the lower radiant tube 13 penetrates through the furnace wall 1, the lower radiant tube 13 is perpendicular to the furnace wall 1, a mixer 15 is fixedly arranged inside the upper radiant tube 3, a gas connecting tube 5 is fixedly arranged at one side of the mixer 15, one end of the gas connecting tube 5, and a valve 6 is movably arranged at one end of the gas connecting pipe 5, a connecting pipe 7 is fixedly arranged at the top end inside the air connecting pipe 16, the top end of the connecting pipe 7 is communicated with one end of the bottom of the upper radiant tube 3, a NOx generation control device 9 is fixedly arranged at the bottom end of the connecting pipe 7, the connecting pipe 7 is connected with the NOx generation control device 9 through a pipeline sealing ring 8, an air conveying pipe 10 is fixedly arranged at the bottom of the NOx generation control device 9, a heat exchanger 14 is fixedly arranged inside the lower radiant tube 13, and one end of the heat exchanger 14 is connected with the NOx generation control device 9 through the air conveying pipe 10.

Preferably, one end of the lower radiant tube 13 is provided with a cool air inlet 11.

Preferably, one end of the bottom of the lower radiant tube 13 is provided with a flue gas outlet 12.

Preferably, the upper radiant tube 3 and the lower radiant tube 13 are fixedly mounted on the furnace wall 1 through the pipe fixing part 2.

Preferably, the NOx generation control device 9 is composed of an inner tube 91 and a mounting head 92, and the mounting holes 17 are opened at the four ends of the mounting head 92.

Preferably, the NOx formation controlling means 9 is formed in an oblate ring shape, made of stainless steel SUS309, having an inner diameter of 71mm, an outer diameter of 123mm, and a thickness of 3 mm.

The working principle is as follows: the radiant tube burner consists of an upper radiant tube 3 and a burner. The nozzle is by coal gas takeover 5, lower radiant tube 13, air takeover 16, heat exchanger 14, connecting pipe 7, NOx generates controlling means 9 and blender 15 etc. and constitutes, this utility model discloses a combustion-supporting air gets into heat exchanger 14 from last radiant tube 3 lower part, utilize the flue gas waste heat to preheat combustion-supporting air to about 450 ℃, spout into 3 upper portions of upper radiant tube and coal gas co-combustion along intermediate junction pipe 7, NOx generates controlling means 9 and heat exchanger 14 air spout and has the clearance, the combustion-supporting air after preheating relies on the entrainment effect to take away partial flue gas when spouting at a high speed, this partial backward flow flue gas participates in the burning, thereby reduce NOx's formation, the clearance is big more, flue gas reflux is big more, reduce NOx range big more, through repeated design and test, under the condition of considering combustion efficiency, the device that the control NOx that satisfies ultralow emission standard generated is designed finally.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An arrangement for controlling NOx production, comprising a furnace wall (1), an upper radiant tube (3), a lower radiant tube (13) and an air connection (16), characterized in that: the upper radiant tube (3) is fixedly arranged at the upper end of the furnace wall (1), the upper radiant tube (3) penetrates through the furnace wall (1), the upper radiant tube (3) is perpendicular to the furnace wall (1), one end of the upper radiant tube (3) is connected with an air connecting tube (16) through a pipeline connecting part (4), the air connecting tube (16) is perpendicular to the upper radiant tube (3), one end of the air connecting tube (16) is connected with a lower radiant tube (13) through the pipeline connecting part (4), the lower radiant tube (13) is perpendicular to the air connecting tube (16), the lower radiant tube (13) is fixedly arranged at the lower end of the furnace wall (1), the lower radiant tube (13) penetrates through the furnace wall (1), the lower radiant tube (13) is perpendicular to the furnace wall (1), a mixer (15) is fixedly arranged in the upper radiant tube (3), one side fixed mounting of blender (15) has coal gas to take over (5), the one end of coal gas takeover (5) is passed go up radiant tube (3) and extend to go up the outside of radiant tube (3), just the one end movable mounting of coal gas takeover (5) has valve (6), the inside top fixed mounting of air takeover (16) has connecting pipe (7), the top of connecting pipe (7) with the one end of going up radiant tube (3) bottom communicates each other, just the bottom fixed mounting of connecting pipe (7) has NOx to generate controlling means (9), just connecting pipe (7) with NOx generates controlling means (9) and passes through pipe seal circle (8) and connect, the bottom fixed mounting of NOx generates controlling means (9) has gas-supply pipe (10), the inside fixed mounting of radiant tube (13) has heat exchanger (14) down, one end of the heat exchanger (14) is connected with the NOx generation control device (9) through the gas conveying pipe (10).

2. An apparatus for controlling NOx production according to claim 1 wherein: one end of the lower radiant tube (13) is provided with a cold air inlet (11).

3. An apparatus for controlling NOx production according to claim 1 wherein: and a flue gas outlet (12) is formed at one end of the bottom of the lower radiant tube (13).

4. An apparatus for controlling NOx production according to claim 1 wherein: the upper radiant tube (3) and the lower radiant tube (13) are fixedly arranged on the furnace wall (1) through a pipeline fixing part (2).

5. An apparatus for controlling NOx production according to claim 1 wherein: the NOx generation control device (9) is composed of an inner pipe (91) and a mounting head (92), and mounting holes (17) are formed in four ends of the mounting head (92).

6. An apparatus for controlling NOx production according to claim 1 wherein: the NOx generation control device (9) is formed in an oblate ring shape, made of stainless steel SUS309, and has an inner diameter of 71mm, an outer diameter of 123mm, and a thickness of 3 mm.