A new type of combustion stabilizing ring device for swirl burners

Abstract

The utility model discloses a novel combustion stabilizing ring device for a swirl burner, comprising an air duct, a combustion stabilizing ring is arranged on the outer side of one end of the air duct, a surfacing layer is arranged between the bottom of the air duct and the combustion stabilizing ring, a circle of spoilers is fixed on the inner wall of the air duct, the inner side of the spoiler is an inwardly contracting structure, and an annular expansion cone structure is arranged on the outer side of the combustion stabilizing ring; the combustion stabilizing ring is connected and fixed to the outer surface of the air duct through an opened connecting hole; the annular expansion cone is on the outer ring of the combustion stabilizing ring and expands obliquely toward the outer side of the outer ring; the front end face of the spoiler is the windward face, and the rear end thereof is the leeward face, and the spoiler structure is arranged, the annular spoiler structure, and the concave structure at the front end thereof are smaller in size than the inner diameter of the air duct, so when in use, it can not only reinforce the interior of the air duct, but also guide the internal secondary air.

Description

Technical Field

[0001] The utility model relates to the field of combustion stabilizing rings, in particular to a novel combustion stabilizing ring device for a swirl burner. Background Art

[0002] The combustion stabilizing ring device is installed at the outlet end of the primary air duct of the swirl burner. When the pulverized coal airflow passes through the device, the pulverized coal particles gather toward the outer circle of the primary air duct, increasing the pulverized coal concentration, effectively reducing the generation of NOx, and reducing the ignition heat, which is beneficial to the timely ignition and stable combustion of the pulverized coal airflow at low load and when burning inferior coal.

[0003] Since the combustion stabilizing ring and combustion stabilizing teeth in the existing combustion stabilizing ring device are usually cast as a whole with the same material, due to the different temperature and airflow scouring environments, problems such as wear and fall of the combustion stabilizing teeth and deformation and damage of the combustion stabilizing ring often occur. The service life of the combustion stabilizing ring device is short, which will seriously affect the safe operation of the boiler and increase the maintenance cost of the power plant. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a novel combustion stabilizing ring device for a swirl burner, which has an annular spoiler structure and an inner concave structure at its front end, and its size is smaller than the inner diameter of the air duct. Therefore, when in use, it can not only reinforce the interior of the air duct, but also guide the internal secondary air. The combustion stabilizing ring structure and the spoiler structure with an annular expansion cone are provided, and the high-heat-resistant spoiler structure can prevent the interior of the air duct from being deformed and damaged, thereby extending the service life of the combustion stabilizing ring device and the air duct. In addition, by providing an annular expansion cone, not only can the primary air and powder airflow be evenly distributed around the primary air duct outlet, but also an annular recirculation zone can be formed on the back flow surface, thereby increasing the reflux amount of coal powder, which is beneficial to the ignition and stable combustion of coal powder.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a new type of flame stabilizing ring device for a swirl burner, comprising an air duct, a flame stabilizing ring is arranged on the outer side of one end of the air duct, a welding layer is arranged between the bottom of the air duct and the flame stabilizing ring, a circle of spoilers is fixed on the inner wall of the air duct, the inner side of the spoiler is an inwardly contracting structure, and an annular expansion cone structure is arranged on the outer side of the flame stabilizing ring.

[0006] As a preferred technical solution of the utility model, the flame stabilizing ring is connected and fixed to the outer surface of the air duct through the provided connecting holes.

[0007] As a preferred technical solution of the utility model, the annular expansion cone is on the outer ring of the combustion stabilizing ring and expands obliquely toward the outside of the outer ring.

[0008] As a preferred technical solution of the utility model, the front end surface of the spoiler is the windward surface, and the rear end thereof is the leeward surface.

[0009] As a preferred technical solution of the utility model, the thickness of the annular expansion cone of the combustion stabilizing ring is 12 to 20 mm.

[0010] As a preferred technical solution of the utility model, the surfacing layer is made of Stellite wear-resistant alloy material.

[0011] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0012] 1. In this device, the spoiler structure is provided, the annular spoiler structure has a concave structure at the front end, and its size is smaller than the inner diameter of the air duct. Therefore, when in use, it can not only reinforce the inside of the air duct, but also guide the secondary air inside.

[0013] 2. In this device, by setting up a flame stabilizing ring structure and a spoiler structure with an annular expansion cone, the high-heat-resistant spoiler structure can prevent deformation and damage inside the air duct, thereby extending the service life of the flame stabilizing ring device and the air duct. In addition, by setting up an annular expansion cone, not only can the primary air and powder airflow be evenly distributed around the primary air duct outlet, but also an annular recirculation zone can be formed on the back flow surface, thereby increasing the reflux amount of coal powder, which is beneficial to the ignition and stable combustion of coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is one of the structural diagrams of the utility model;

[0015] Figure 2 This is the second structural diagram of the utility model;

[0016] Figure 3 It is a structural cross-sectional view of the utility model;

[0017] Figure 4 for Figure 3 The main view of the structure.

[0018] Among them: 1. air duct; 2. flame stabilizing ring; 21. connecting hole; 3. spoiler; 4. cladding layer. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0020] Embodiment:

[0021] like Figure 1-4 As shown, the utility model provides a new type of stabilizing ring device for a swirl burner, including an air duct 1, a stabilizing ring 2 is arranged on the outer side of one end of the air duct 1, a welding layer 4 is arranged between the bottom of the air duct 1 and the stabilizing ring 2, a circle of spoiler 3 is fixed to the inner wall of the air duct 1, the inner side of the spoiler 3 is an inwardly contracting structure, and an annular expansion cone structure is arranged on the outer side of the stabilizing ring 2; through the spoiler 3 structure that is arranged, the annular spoiler 3 structure, through the concave structure at its front end, the size of which is smaller than the inner diameter of the air duct 1, so when in use, it can not only reinforce the interior of the air duct 1, but also guide the internal secondary air.

[0022] In other embodiments, the flame stabilizing ring 2 is connected and fixed to the outer surface of the air duct 1 through the opened connecting hole 21; the annular expansion cone is on the outer ring of the flame stabilizing ring 2 and extends obliquely toward the outside of the outer ring; the front end face of the spoiler 3 is the windward face, and the rear end thereof is the leeward face; the thickness of the annular expansion cone of the flame stabilizing ring 2 is 12 to 20 mm; the surfacing layer 4 is made of Stellite wear-resistant alloy material; by setting the flame stabilizing ring 2 structure with annular expansion cone and the spoiler 3 structure, the high-heat-resistant spoiler 3 structure can prevent the internal deformation and damage of the air duct 1, and extend the service life of the flame stabilizing ring 2 device and the air duct 1. In addition, by setting the annular expansion cone, not only can the primary air-powder airflow be evenly distributed around the primary air duct outlet, but also an annular reflux zone can be formed on the leeward face, thereby increasing the reflux amount of coal powder, which is beneficial to the ignition and stable combustion of coal powder.

[0023] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A novel combustion stabilizing ring device for a swirl burner, comprising an air duct (1), characterized in that: A flame stabilizing ring (2) is arranged on the outside of one end of the air duct (1), a weld layer (4) is arranged between the bottom of the air duct (1) and the flame stabilizing ring (2), a circle of spoilers (3) is fixed on the inner wall of the air duct (1), the inner side of the spoiler (3) is an inwardly contracting structure, and an annular expansion cone structure is arranged on the outside of the flame stabilizing ring (2).

2. A novel combustion stabilizing ring device for a swirl burner according to claim 1, characterized in that: The flame stabilizing ring (2) is connected and fixed to the outer surface of the air duct (1) via the opening of the connecting hole (21).

3. A novel combustion stabilizing ring device for a swirl burner according to claim 1, characterized in that: The annular expansion cone is on the outer ring of the combustion stabilizing ring (2) and is inclined and expanded toward the outer side of the outer ring.

4. A novel combustion stabilizing ring device for a swirl burner according to claim 1, characterized in that: The front end surface of the spoiler (3) is the windward surface, and the rear end surface is the leeward surface.

5. A novel combustion stabilizing ring device for a swirl burner according to claim 1, characterized in that: The thickness of the annular expansion cone of the combustion stabilizing ring (2) is 12 to 20 mm.

6. A novel combustion stabilizing ring device for a swirl burner according to claim 1, characterized in that: The surfacing layer (4) is made of Stellite wear-resistant alloy material.

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