A biomass coupled burner

Abstract

This utility model discloses a biomass co-firing burner, relating to the field of biomass co-firing power generation technology. It includes a central air duct, a biomass primary air duct, an inner secondary air duct, an elbow, a pulverized coal concentration separation device, a pulverized coal dilute phase primary air duct, a pulverized coal dense phase primary air duct, a middle secondary air duct, an outer secondary air duct, a secondary air diffuser and a middle secondary air cyclone separator, a pulverized coal flame stabilizer, a pulverized coal dilute phase primary air duct cyclone separator, an inner secondary air cyclone separator, a biomass flame stabilizer, an igniter, and a pulverized coal concentration separation adjustment rod. The air ducts, from the center outwards, are: central air duct, biomass primary air duct, inner secondary air duct, pulverized coal dilute phase primary air duct, pulverized coal dense phase primary air duct, middle secondary air duct, and outer secondary air duct. This utility model fully utilizes the advantages of biomass fuel—high volatile content and easy ignition—by igniting the biomass first, significantly reducing ignition costs.

Description

Technical Field

[0001] This utility model relates to the field of biomass co-generation technology, specifically to a biomass co-combustion burner. Background Technology

[0002] Currently, the burners used in biomass co-generation technology often fall into two categories: one is to reuse the original pulverized coal burner, and the other is to introduce biomass and pulverized coal into separate burners. The use of these burners has obvious defects and shortcomings.

[0003] On the one hand, the advantages of biomass fuels, such as high volatile content and easy ignition, cannot be fully utilized, which has an adverse effect on the combustion and stable combustion of pulverized coal;

[0004] On the other hand, it is also not conducive to achieving low-NOx combustion.

[0005] Therefore, we propose a biomass coupled burner to solve the above problems. Utility Model Content

[0006] In view of the problems existing in the above-mentioned biomass coupled burners, this utility model is proposed.

[0007] Therefore, the purpose of this invention is to provide a biomass coupled burner that solves the problem that in the existing biomass coupled power generation process, the biomass fuel in the burner volatilizes too much, reducing combustion stability and making it difficult to achieve low-NOx combustion.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A biomass coupled burner includes a central air duct, a biomass primary air duct, an inner secondary air duct, an elbow, a pulverized coal concentration separation device, a pulverized coal dilute phase primary air duct, a pulverized coal dense phase primary air duct, a middle secondary air duct, an outer secondary air duct, a secondary air diffuser and a middle secondary air cyclone, a pulverized coal stabilizer, a pulverized coal dilute phase primary air duct cyclone, an inner secondary air cyclone, a biomass stabilizer, an igniter, and a pulverized coal concentration separation adjustment rod. The air ducts, from the center outwards, are: central air duct, biomass primary air duct, inner secondary air duct, pulverized coal dilute phase primary air duct, pulverized coal dense phase primary air duct, middle secondary air duct, and outer secondary air duct.

[0010] Preferably, the igniter is located inside the central air duct, and the igniter is arranged to coincide with the center line of the central air duct.

[0011] Preferably, the coal powder concentration separation adjustment rod is located inside the coal powder concentration separation device, and the coal powder concentration separation adjustment rod is located at the lower end of the inner secondary air duct.

[0012] Preferably, the biomass combustion stabilizer is located at the end of the biomass primary air duct, and the pulverized coal combustion stabilizer is located at the end of the pulverized coal dense phase primary air duct.

[0013] Furthermore, the inner secondary air cyclone and the middle secondary air cyclone are respectively located at the ends of the inner secondary air duct and the middle secondary air duct, and the pulverized coal dilute phase primary air cyclone is located at the end of the pulverized coal dilute phase primary air duct.

[0014] Preferably, the secondary air diffuser is fixedly sleeved on the outside of the external secondary air duct.

[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0016] 1. This utility model, through the central air duct, biomass primary air duct, inner secondary air duct, middle secondary air duct and outer secondary air duct, can give full play to the advantages of biomass fuel having high volatile content and being easy to ignite. When igniting, the biomass is ignited first, which greatly reduces the ignition cost.

[0017] 2. This utility model, through the coal powder concentration separation device, coal powder dilute phase primary air duct, coal powder stabilizer and biomass stabilizer, enables the coal powder to be ignited by the heat generated by the combustion of biomass itself after it is ignited, without the need for other additional ignition methods, thus simplifying the ignition process.

[0018] 3. This utility model is conducive to achieving low-nitrogen combustion, meeting environmental protection requirements, and reducing nitrogen oxide emissions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the internal structure of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Central air duct; 2. Biomass primary air duct; 3. Inner secondary air duct; 4. Elbow; 5. Pulverized coal concentration separation device; 6. Pulverized coal dilute phase primary air duct; 7. Pulverized coal dense phase primary air duct; 8. Middle secondary air duct; 9. Outer secondary air duct; 10. Secondary air diffuser; 11. Middle secondary air cyclone separator; 12. Pulverized coal flame stabilizer; 13. Pulverized coal dilute phase primary air duct cyclone separator; 14. Inner secondary air cyclone separator; 15. Biomass flame stabilizer; 16. Ignition device; 17. Pulverized coal concentration separation adjustment lever. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] This utility model discloses a biomass coupled burner.

[0025] This utility model provides, for example Figure 1 The biomass coupled burner shown includes a central air duct 1, a biomass primary air duct 2, an inner secondary air duct 3, an elbow 4, a pulverized coal concentration separation device 5, a pulverized coal dilute phase primary air duct 6, a pulverized coal dense phase primary air duct 7, a middle secondary air duct 8, an outer secondary air duct 9, a secondary air diffuser 10, and a middle secondary air cyclone separator 11. The secondary air diffuser 10 is fixedly sleeved on the outside of the outer secondary air duct 9. Other components include a pulverized coal stabilizer 12, a pulverized coal dilute phase primary air duct cyclone separator 13, and an inner secondary air cyclone separator 14. The inner secondary air cyclone separator 14 and the middle secondary air cyclone separator 11 are respectively located at the ends of the inner secondary air duct 3 and the middle secondary air duct 8. The pulverized coal dilute phase primary air cyclone separator 13 is located at the end of the pulverized coal dilute phase primary air duct 6. The system includes a biomass stabilizer 15, which is located at the end of the biomass primary air duct 2; a pulverized coal stabilizer 12, which is located at the end of the pulverized coal dense phase primary air duct 7; an igniter 16; and a pulverized coal concentration-degradation separation adjustment rod 17. The igniter 16 is located inside the central air duct 1, and its centerline coincides with that of the central air duct 1. The pulverized coal concentration-degradation separation adjustment rod 17 is located inside the pulverized coal concentration-degradation separation device 5, and is located at the lower end of the inner secondary air duct 3. The air ducts, from the center outwards, are: central air duct 1, biomass primary air duct 2, inner secondary air duct 3, pulverized coal dilute phase primary air duct 6, pulverized coal dense phase primary air duct 7, middle secondary air duct 8, and outer secondary air duct 9.

[0026] Working principle: The air ducts of this burner, from the center outwards, are: central air duct 1, biomass primary air duct 2, inner secondary air duct 3, pulverized coal dilute phase primary air duct 6, pulverized coal dense phase primary air duct 7, middle secondary air duct 8, and outer secondary air duct 9. The air ducts and related devices work together to achieve the combustion process.

[0027] During ignition, biomass is first introduced through the biomass primary air duct 2, while a portion of secondary air is introduced through the central air duct 1 and the inner secondary air duct 3. The biomass is ignited using the igniter 16 located inside the central air duct 1, and the biomass stabilizer 15 at the end of the biomass primary air duct 2 ensures stable combustion. Afterwards, pulverized coal, intermediate secondary air, and outer secondary air are introduced. The pulverized coal, after being separated by the pulverized coal concentration separation device 5, is introduced through the pulverized coal dilute phase primary air duct 6 and the pulverized coal dense phase primary air duct 7, respectively. The pulverized coal concentration separation adjustment lever 17 can be used to adjust the concentration. The process is adjusted, and the pulverized coal stable burner 12 at the end of the dense phase primary air duct 7 helps to stabilize the combustion of pulverized coal. The inner secondary air cyclone 14 at the end of the inner secondary air duct 3, the pulverized coal dilute phase primary air cyclone 13 at the end of the pulverized coal dilute phase primary air duct 6, the middle secondary air cyclone 11 at the end of the middle secondary air duct 8, and the secondary air diffuser 10 at the end of the outer secondary air duct 9 respectively play a role in regulating the air in each air duct to optimize the combustion environment. Finally, the heat generated by biomass combustion is used to heat and ignite the pulverized coal, realizing the coupled combustion of biomass and pulverized coal.

[0028] The above description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A biomass coupled burner, comprising a central air duct (1), a biomass primary air duct (2), an inner secondary air duct (3), an elbow (4), a pulverized coal concentration separation device (5), a pulverized coal dilute phase primary air duct (6), a pulverized coal dense phase primary air duct (7), a middle secondary air duct (8), an outer secondary air duct (9), a secondary air diffuser (10), a middle secondary air cyclone separator (11), a pulverized coal stabilizer (12), a pulverized coal dilute phase primary air duct cyclone separator (13), an inner secondary air cyclone separator (14), a biomass stabilizer (15), an igniter (16), and a pulverized coal concentration separation adjustment rod (17), characterized in that, The air ducts are arranged from the center outward as follows: central air duct (1), biomass primary air duct (2), inner secondary air duct (3), pulverized coal dilute phase primary air duct (6), pulverized coal dense phase primary air duct (7), middle secondary air duct (8), and outer secondary air duct (9).

2. The biomass coupled burner according to claim 1, characterized in that, The igniter (16) is located inside the central air duct (1), and the igniter (16) is arranged to coincide with the center line of the central air duct (1).

3. The biomass coupled burner according to claim 1, characterized in that, The coal powder concentration separation adjustment rod (17) is located inside the coal powder concentration separation device (5), and the coal powder concentration separation adjustment rod (17) is located at the lower end of the inner secondary air duct (3).

4. The biomass coupled burner according to claim 1, characterized in that, The biomass stabilizer (15) is located at the end of the biomass primary air duct (2), and the pulverized coal stabilizer (12) is located at the end of the pulverized coal dense phase primary air duct (7).

5. The biomass coupled burner according to claim 1, characterized in that, The inner secondary air cyclone (14) and the middle secondary air cyclone (11) are respectively located at the ends of the inner secondary air duct (3) and the middle secondary air duct (8), and the coal powder dilute phase primary air duct cyclone (13) is located at the end of the coal powder dilute phase primary air duct (6).

6. The biomass coupled burner according to claim 1, characterized in that, The secondary air diffuser (10) is fixedly sleeved on the outside of the external secondary air duct (9).

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