Front wall air mixing adjustable low-nitrogen hot blast stove

Abstract

The utility model relates to the technical field of hot blast stoves, and aims to provide a front wall air mixing adjustable low-nitrogen hot blast stove which comprises a front wall and a hearth connected with the front wall, a circulating air channel I is arranged in the middle of the front wall, and a circulating air channel II is arranged around the circulating air channel I in a surrounding mode. And the circulating air channel I and the circulating air channel II are both communicated with the hearth. The structure of an existing hot blast stove is optimized, a traditional single smoke channel is improved into the two circulating air channels which are communicated with each other, and the adjusting valves are adopted to control the air quantity entering the circulating air channel I and the circulating air channel II respectively, so that the hot blast stove can be cooled, the flame concentration ratio is reduced, and the energy consumption is reduced. Meanwhile, the hearth can be protected, the situation that the inner wall of the hearth is scoured by too large circulating air entering the hearth is avoided, the furnace body is protected against damage, and the service life of the hot blast stove can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of hot blast stoves, in particular to a low-nitrogen hot blast stove with adjustable front-wall air mixing. Background Art

[0002] In the current design of hot blast stoves, only a single hot air circulation channel is provided on the front wall, which limits the adjustment ability of the circulating air volume. If the circulating air volume is too large, it may not only pose a threat to the safety of the furnace chamber, increase the resistance of flue gas, but also cause serious wear to the inner wall of the furnace chamber, thereby shortening the service life of the hot blast stove. In addition, too large a circulating air volume will also affect the ignition process, while too small an air volume is not conducive to reducing the furnace chamber temperature, which may lead to overheating and damage of the furnace chamber.

[0003] At the same time, the existing circulating flue gas has limited effect in reducing the temperature around the flame, which affects the efficiency of reducing nitrogen oxide emissions. Moreover, the control of the circulating air temperature is also a problem. If the temperature is too high, it will damage the furnace chamber. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a low-nitrogen hot blast stove with adjustable front-wall air mixing to solve the problems raised in the above background art.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A low-nitrogen hot blast stove with adjustable front-wall air mixing includes a front wall and a furnace chamber connected to the front wall. A burner is arranged in the middle of the front wall, and an air outlet is arranged in the middle of the end of the furnace chamber far from the front wall. A circulating air channel I is arranged in the middle of the front wall, and a circulating air channel II is arranged around the circulating air channel I. Both the circulating air channel I and the circulating air channel II are communicated with the furnace chamber.

[0007] The burner includes an air supply pipe. One end of the air supply pipe is located inside the circulating air channel I, and the other end is located outside the front wall, and the flame combustion area formed by the air supply pipe is located inside the furnace chamber.

[0008] The circulating air channel I and the circulating air channel II are communicated through an air supply port.

[0009] A ventilation port is arranged on the wall between the circulating air channel II and the furnace chamber.

[0010] Regulating valves are arranged on both the air supply port and the ventilation port.

[0011] To sum up, due to the adoption of the above technical scheme, the beneficial effects of the utility model are as follows:

[0012] 1) By optimizing the structure of the existing hot blast stove, the traditional single flue gas channel is improved into two interconnected circulating air channels. The two channels can independently control the circulating air volume respectively, which has a cooling effect on the hot blast stove and avoids overheating and damage of the furnace body;

[0013] 2) By using a regulating valve to control the intake air volume of the circulating air, the air volume entering the flame combustion area can be controlled, which is convenient for reducing the flame concentration and creating a low-oxygen condition by reducing the flame temperature, thereby reducing the generation of nitrogen oxides and meeting the industrial required standards;

[0014] 3) By using two regulating valves to control the air volume entering the front wall to the furnace chamber, the furnace chamber can be protected, avoiding excessive circulating air entering the furnace chamber from scouring the inner wall of the furnace chamber and protecting the furnace body from being damaged, which can effectively extend the service life of the hot blast stove. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an embodiment of the present utility model.

[0016] Reference numerals and names of the drawings: fuel inlet 1, primary air inlet 2, ignition device 3, front wall 4, circulating air channel I 5, circulating air channel II 6. Detailed Embodiments

[0017] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Such as Figure 1As shown in the figure, a low-nitrogen hot blast stove with adjustable premixing air in the front wall of the present utility model includes a front wall 4 and a furnace chamber connected to the front wall 4. An air outlet is provided in the middle of the end of the furnace chamber away from the front wall 4, and the air outlet is used for conveying hot air. A burner is provided in the middle of the front wall 4. The burner includes an air supply pipe. One end of the air supply pipe is located inside the circulation air passage I 5, and the other end is located outside the front wall 4, and the flame combustion area formed by the air supply pipe is located inside the furnace chamber. The burner is a prior art, and a fuel inlet 1, a primary air inlet 2 and an ignition device 3 are provided at the end of the burner located outside the front wall 4, which are used to send fuel and primary air into the furnace chamber and ignite.

[0020] A circulation air passage I 5 is provided in the middle of the front wall 4, and a circulation air passage II 6 is arranged around the circulation air passage I 5. Both the circulation air passage I 5 and the circulation air passage II 6 are connected to the furnace chamber. The circulation air passage I 5 and the circulation air passage II 6 are connected through an air supply port, and a ventilation port is provided on the wall surface between the circulation air passage II 6 and the furnace chamber.

[0021] Regulating valves are provided on both the air supply port and the ventilation port. On the one hand, the two regulating valves can control an appropriate air volume to be mixed into the flame combustion area, which can reduce the concentration of the flame, lower the flame temperature, create a low-oxygen condition, thereby reducing the generation of nitrogen oxides and creating a safe and reliable ignition condition. On the other hand, the regulating valves can be used to control an appropriate air volume to directly enter the furnace chamber, which can not only achieve the purpose of reducing the furnace chamber temperature and preventing the furnace body from being burned, but also reduce the erosion of the flue gas on the air duct and the inner wall of the furnace chamber, thereby achieving the purpose of protecting the furnace body and extending the service life of the hot blast stove.

Claims

1. A front-wall air-mixing adjustable low-nitrogen hot blast stove, comprising a front wall (4) and a furnace chamber connected to the front wall (4), a burner is arranged in the middle of the front wall (4), and an air outlet is arranged in the middle of one end of the furnace chamber far from the front wall (4), and is characterized in that: A circulating air passage Ⅰ (5) is arranged in the middle of the front wall (4), and a circulating air passage Ⅱ (6) is arranged around the circulating air passage Ⅰ (5). Both the circulating air passage Ⅰ (5) and the circulating air passage Ⅱ (6) are communicated with the furnace.

2. The adjustable low-nitrogen hot blast stove with premixed air in the front wall according to claim 1, characterized in that, The burner includes an air supply pipe. One end of the air supply pipe is located inside the circulating air passage Ⅰ (5), and the other end is located outside the front wall (4), and the flame combustion area formed by the air supply pipe is located inside the furnace.

3. The adjustable low-nitrogen hot blast stove with front wall air mixing according to claim 1, characterized in that, The circulating air passage Ⅰ (5) and the circulating air passage Ⅱ (6) are communicated through an air supply port.

4. The adjustable low-nitrogen hot blast stove with premixed air in the front wall according to claim 3, characterized in that, A ventilation opening is arranged on the wall surface between the circulating air passage Ⅱ (6) and the furnace.

5. The adjustable low-nitrogen hot blast stove with front wall air mixing according to claim 4, characterized in that, Regulating valves are arranged on both the air supply port and the ventilation opening.

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