Low-nitrogen pulverized coal burner
By adopting coal powder dispersing pipes and casing structures in coal powder burners, and using dispersed fins and central pipes to form cyclone channels and conical dispersion surfaces, the problem of large amount of nitrogen oxides in existing coal powder burners is solved, and effective installation and maintenance are achieved in a narrow space.
Patent Information
- Application Number
- CN202421872222.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-05
AI Technical Summary
Existing coal pulverized burners generate more nitrogen oxides during combustion, resulting in environmental pollution, and the prior art is difficult to effectively install and maintain in narrow spaces.
A low-nitrogen type coal powder burner is designed, adopting a coal powder dispersed pipe and casing structure. Through the combination of dispersed fins and central pipes, a cyclone channel and a conical dispersion surface are formed to improve the dispersion and uniformity of coal powder.
It effectively reduces the amount of nitrogen oxides, improves the uniformity of coal pulverized combustion, reduces heat consumption, is suitable for installation in narrow spaces, and reduces production and maintenance costs.
Smart Images
Figure CN222911618U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of pulverized coal burners, and more specifically, to a low-nitrogen pulverized coal burner. Background Art
[0002] In the fields of building materials, metallurgy and chemical industry, there are a large number of process requirements that require suspended preheating, among which there is a large number of requirements to add a fire to improve the preheating effect or strengthen the decomposition effect.
[0003] Take the preheater in the building materials industry as an example. As the core equipment of the new dry process cement production, the preheater has always been responsible for preheating and decomposition. Among them, the decomposition furnace undertakes most of the pre-decomposition tasks of the materials. With years of development, the thermal field of the decomposition furnace is stable and can well adapt to the combustion of inferior coal.
[0004] Although the existing decomposition furnace lower cone can provide heat and reaction space well, the intense combustion of coal powder creates a strong oxidizing atmosphere and generates more nitrogen oxides. In order to reduce the emission of nitrogen oxides, most cement plants have installed denitrification devices. However, with the increasing requirements for environmental protection, the emission of nitrogen oxides is gradually decreasing. Therefore, if the emission of nitrogen oxides is reduced by denitrification devices alone, more ammonia water will be consumed, which is costly and will also cause a significant increase in costs.
[0005] Among the existing pulverized coal burners, on the one hand, the single-tube pulverized coal burner has a problem of output in strands, poor dispersion effect, resulting in excessive nitrogen oxide generation; the injection distance is far and the spray is sprayed onto the opposite furnace wall, forming crusting or even burning through; on the other hand, when using a multi-channel burner, although the dispersion problem can be solved, it has a large size, which is not conducive to installation in a narrow space, and requires additional cold air, which increases heat consumption and deviates from the energy-saving and environmental protection policy. Therefore, it is of utmost importance to find the cause from the structure of the burner and fundamentally reduce the generation of nitrogen oxides. Utility Model Content
[0006] The utility model aims to provide a low-nitrogen pulverized coal burner, which can break up the pulverized coal to make it more uniform in space, reduce the aggregation of the pulverized coal, make the pulverized coal burn more uniformly, reduce local overheating, and produce less nitrogen oxides.
[0007] The above technical objectives of the utility model are achieved through the following technical solutions: A low-nitrogen pulverized coal burner, comprising: a pulverized coal dispersion pipe and a sleeve, wherein a first mounting member is provided on the outer side of the coal inlet end of the pulverized coal dispersion pipe, and the first mounting member is used to fix the coal inlet end of the pulverized coal dispersion pipe with the coal outlet end of the pulverized coal pipeline;
[0008] A dispersion component is provided inside the coal outlet end of the coal powder dispersion pipe, and the dispersion component includes a central pipe and at least two dispersion fins, all of the dispersion fins are evenly fixedly connected between the outer side of the central pipe and the inner side of the coal powder dispersion pipe, and the dispersion fins are used to separate the channel between the central pipe and the coal powder dispersion pipe into a swirl channel;
[0009] The coal outlet end of the casing is docked with the target equipment, a second mounting member is provided on the outside of the coal inlet end of the casing, a third mounting member is provided on the outside of the pipe body of the coal powder dispersion pipe, the coal inlet end of the casing is sleeved on the outside of the coal outlet end of the coal powder dispersion pipe, and are connected by the second mounting member and the third mounting member.
[0010] As a preferred technical solution of the utility model, the angle between the edge of the coal inlet end and the edge of the coal outlet end of the dispersion fin and the vertical projection line of the end surface of the coal powder dispersion pipe is α, and α>0°.
[0011] As a preferred technical solution of the utility model, the dispersion fins are spiral curved plates or inclined flat plates.
[0012] As a preferred technical solution of the utility model, the inner edge and the outer edge of the coal outlet end of the central pipe are provided with conical dispersion surfaces expanding outward in the coal outlet direction.
[0013] As a preferred technical solution of the utility model, the central axis of the central tube coincides with the central axis of the coal powder dispersion tube.
[0014] As a preferred technical solution of the present utility model, the first mounting member, the second mounting member, and the third mounting member are all flanges.
[0015] As a preferred technical solution of the present utility model, a mounting pad is sandwiched between the second mounting member and the third mounting member.
[0016] In summary, the utility model has the following beneficial effects: using two parts of coal powder to disperse and fill the space as a method, a larger conical umbrella dispersion space is formed on the outside by the dispersion fins, and a smaller jet or smaller conical umbrella dispersion space is formed in the center by the central tube to improve the coal powder dispersion performance. The coal powder burner of the utility model can scatter the coal powder to make it more uniform in space, reduce the aggregation of coal powder, make the coal powder burn more uniform, reduce local overheating, and reduce the amount of nitrogen oxides produced; no additional cold air is needed, and only the air used for coal powder transportation can be used to complete the dispersion effect without additional heat consumption; the sleeve structure is adopted, and the coal powder burner is easy to replace after damage without damaging the original equipment; the overall structure is compact, can be installed in a smaller space, and has strong adaptability to equipment; the structure is simple, the production cost is low, and the operation and maintenance costs can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the utility model;
[0018] Figure 2 It is a schematic diagram of the dispersion fin of the utility model.
[0019] In the figure: 1. pulverized coal dispersion pipe; 2. casing; 3. first mounting piece; 4. center pipe; 5. dispersion fins; 6. second mounting piece; 7. third mounting piece; 8. conical dispersion surface; 9. mounting pad. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0021] When coal powder is burned, if the coal powder has poor dispersion, it is easy for coal powder to aggregate and burn, which makes the temperature in the local area too high, providing favorable conditions for the generation of nitrogen oxides, causing nitrogen oxides to be generated quickly and pollute the environment. Therefore, in order to reduce the generation of nitrogen oxides, it is necessary to improve the dispersion of coal powder so that the coal powder can be mixed into the air flow inside the equipment more evenly in space, reduce the phenomenon of aggregate combustion, and destroy the production conditions of nitrogen oxides. For this purpose, the utility model provides a low-nitrogen coal powder burner, such as Figure 1 As shown, it includes a coal powder dispersion pipe 1 and a sleeve 2;
[0022] A first mounting member 3 is provided outside the coal inlet end of the coal powder dispersing pipe 1, and the first mounting member 3 is used to fixedly connect the coal inlet end of the coal powder dispersing pipe 1 with the coal outlet end of the coal powder pipeline, so that the coal powder dispersing pipe 1 can receive the coal powder transported in the coal powder pipeline;
[0023] A dispersing component is provided inside the coal outlet end of the coal powder dispersing pipe 1, and the dispersing component includes a central pipe 4 and at least two dispersing fins 5, such as Figure 2As shown, four dispersion fins 5 are provided; all the dispersion fins 5 are evenly fixedly connected between the outer side of the central tube 4 and the inner side of the coal powder dispersion tube 1, and the dispersion fins 5 are used to separate the channel between the central tube 4 and the coal powder dispersion tube 1 into a swirl channel, wherein the dispersion fins 5 are spiral curved plates or inclined flat plates, which improve the spraying effect and scatter the coal powder;
[0024] The central axis of the central tube 4 coincides with the central axis of the coal powder dispersion tube 1, which can make the passage between the central tube 4 and the coal powder dispersion tube 1 uniform, and facilitate the coal powder to be dispersed more evenly. The inner and outer edges of the coal outlet end of the central tube 4 are provided with a conical dispersion surface 8 that expands outward in the coal outlet direction. The central tube 4 can support the dispersion fins 5, facilitate the installation of the dispersion fins 5, and can also absorb dust from the second passage of the coal powder, thereby improving the dispersion of the coal powder. Figure 2 In the embodiment, the included angle of the conical dispersing surface 8 is a cone angle of β, 0°≤β≤180°, which can be selected according to the actual equipment space size to improve the uniform dispersion of the coal powder.
[0025] The coal outlet end of the casing 2 is connected to the target equipment. When in use, it is installed on the target equipment in advance to facilitate masonry work. A second mounting member 6 is provided on the outside of the coal inlet end of the casing 2, and a third mounting member 7 is provided on the outside of the pipe body of the coal powder dispersion pipe 1. The coal inlet end of the casing 2 is sleeved on the outside of the coal outlet end of the coal powder dispersion pipe 1, and is connected by the second mounting member 6 and the third mounting member 7.
[0026] The working principle of the utility model is: firstly install the sleeve 2 on the used equipment, then install the pulverized coal dispersion pipe 1 on the pulverized coal sleeve 2, and then connect it with the pulverized coal pipeline, and the pulverized coal pipeline is used to transport the pulverized coal to the pulverized coal burner.
[0027] The coal powder is transported from the coal powder pipeline to the coal powder dispersion pipe 1, and then a part of it is blocked by the dispersion fins 5, forming a vortex, and is sprayed out on the far right side to disperse the coal powder quickly. In addition, since the coal powder is sprayed out in a spiral shape and dispersed quickly, and then encounters the impact of the air flow inside the equipment, the coal powder spraying distance is short, so that the coal powder quickly blends into the air flow of the equipment. Another small part of the coal powder passes through the central tube 4 and is sprayed out from the right opening, so that this part of the coal powder is sprayed out from the center, gradually diffuses and rushes into the air flow inside the equipment, and improves the uniformity of the coal powder at the center position inside the equipment. If the equipment space is limited, in order to avoid the spraying distance of this part of the coal powder being too far, or even spraying onto the inner wall of the opposite equipment, a conical structure is set at the end of the central tube 4 to make the coal powder diverge, so that the coal powder fills the conical space generated by the coal powder spraying at the dispersion fins 5, so that the coal powder is more uniform.
[0028] The advantages of the pulverized coal burner in the utility model are: using two parts of pulverized coal to disperse and fill the space as a method, a larger conical umbrella dispersion space is formed on the outside by the dispersion fins 5, and a smaller jet or smaller conical umbrella dispersion space is formed in the center by the central tube 4 to improve the pulverized coal dispersion performance. The pulverized coal burner of the utility model can scatter the pulverized coal to make it more uniform in space, reduce the aggregation of pulverized coal, make the pulverized coal burn more uniform, reduce local overheating, and reduce the amount of nitrogen oxides produced; no additional cold air is needed, and the pulverizing effect can be completed by relying only on the air used for pulverized coal transportation, without additional heat consumption; the structure of the sleeve 2 is adopted, and the pulverized coal burner is easy to replace after damage without damaging the original equipment; the overall structure is compact, can be installed in a smaller space, and has strong adaptability to equipment; the structure is simple, the production cost is low, and the operation and maintenance costs can be reduced.
[0029] Specifically, the angle between the edge of the coal inlet end and the edge of the coal outlet end of the dispersion fin 5 on the vertical projection line of the end face of the coal powder dispersion pipe 1 is α, α>0°, and there is no limit on the maximum value, that is, the spiral plates can be projected and overlap, or they can be multiple spiral turns, and can be designed according to the actual size of the space.
[0030] Specifically, the first mounting member 3, the second mounting member 6, and the third mounting member 7 are all flanges. A mounting pad 9 is sandwiched between the second mounting member 6 and the third mounting member 7 to achieve a stable and firm mounting connection during actual use.
[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A low nitrogen type pulverized coal burner, characterized by: include: A coal powder dispersion pipe (1) and a sleeve (2), wherein a first mounting member (3) is arranged outside the coal inlet end of the coal powder dispersion pipe (1), and the first mounting member (3) is used to fixedly connect the coal inlet end of the coal powder dispersion pipe (1) with the coal outlet end of the coal powder pipeline; A dispersion component is provided inside the coal outlet end of the coal powder dispersion pipe (1), the dispersion component comprising a central pipe (4) and at least two dispersion fins (5), all of the dispersion fins (5) are evenly fixedly connected between the outer side of the central pipe (4) and the inner side of the coal powder dispersion pipe (1), and the dispersion fins (5) are used to separate the channel between the central pipe (4) and the coal powder dispersion pipe (1) into a swirl channel; The coal outlet end of the sleeve (2) is butted against the target equipment, a second mounting member (6) is arranged outside the coal inlet end of the sleeve (2), a third mounting member (7) is arranged outside the pipe body of the coal powder dispersion pipe (1), the coal inlet end of the sleeve (2) is sleeved outside the coal outlet end of the coal powder dispersion pipe (1), and is connected via the second mounting member (6) and the third mounting member (7).
2. A low nitrogen type pulverized coal burner according to claim 1, characterized in that: The angle between the edge of the coal inlet end and the edge of the coal outlet end of the dispersion fin (5) and the vertical projection line of the end surface of the coal powder dispersion pipe (1) is α, and α>0°.
3. A low nitrogen type pulverized coal burner according to claim 2, characterized in that: The dispersion fins (5) are spiral curved plates or inclined flat plates.
4. A low-nitrogen pulverized coal burner according to claim 3, characterized in that: The inner edge and the outer edge of the coal outlet end of the central pipe (4) are provided with conical dispersion surfaces (8) expanding outward in the coal outlet direction.
5. A low-nitrogen pulverized coal burner according to claim 4, characterized in that: The central axis of the central pipe (4) coincides with the central axis of the coal powder dispersion pipe (1).
6. A low-nitrogen pulverized coal burner according to claim 5, characterized in that: The first mounting member (3), the second mounting member (6) and the third mounting member (7) are all flanges.
7. A low-nitrogen pulverized coal burner according to claim 6, characterized in that: A mounting pad (9) is sandwiched between the second mounting member (6) and the third mounting member (7).