Longitudinal intercept adjustable secondary tuyere of biomass circulating fluidized bed boiler

Abstract

The utility model discloses a longitudinal intercept adjustable secondary tuyere of a biomass circulating fluidized bed boiler, which is characterized in that a secondary tuyere structure is arranged on a front / rear wall of the biomass circulating fluidized bed boiler and is arranged at a hearth of the biomass circulating fluidized bed boiler and a throat of a first flue; the secondary air port structure comprises a secondary air distribution pipeline, the secondary air distribution pipeline is communicated with a secondary air inlet pipeline, and the end, away from the secondary air distribution pipeline, of the secondary air inlet pipeline penetrates through the biomass circulating fluidized bed boiler and extends to the outer side of the biomass circulating fluidized bed boiler. Longitudinal adjustable gate valves are arranged on the secondary air inlet pipelines, the longitudinal adjustable gate valves are arranged on the spaced secondary air inlet pipelines, and the secondary air port structures are located on the front wall and the rear wall and are arranged in a staggered mode. The secondary tuyere structures are arranged on the front / rear wall in a staggered manner; and the secondary tuyere structures on the front wall are obliquely arranged at intervals.

Description

Technical Field

[0001] The utility model belongs to the technical field of biomass boilers, and in particular relates to a secondary air inlet with adjustable longitudinal intercept of a biomass circulating fluidized bed boiler. Background Art

[0002] When circulating fluidized bed boilers and other equipment are in operation, in order to effectively reduce the amount of fly ash generated by boiler combustion and the large amount of combustible material wasted due to fly ash, the current main practice is to centrally collect the fly ash generated by boiler combustion, and then return it to the boiler through the boiler's air supply system for combustion, thereby reducing the amount of fly ash generated.

[0003] In order to achieve sufficient combustion of fly ash in the prior art, in actual use, existing air supply inlets are adopted (however, some existing secondary air inlet devices cannot change the rotation direction of the inlet pipe according to actual installation requirements during use, which is not conducive to actual installation and use, and the air intake volume of the secondary air inlet pipe cannot be adjusted, resulting in defects such as low working efficiency and low use efficiency). It is very easy for the fly ash to be burned in an inappropriate position in the boiler due to improper mixing ratio and uneven mixing between the fly ash and the air supply flow, thereby greatly affecting the combustion efficiency of the fly ash.

[0004] In view of the above factors, a biomass circulating fluidized bed boiler with an adjustable longitudinal intercept secondary air inlet is specially designed, which can externally control the air intake of the secondary air duct, improve work efficiency and utilization efficiency, promote the mixing of materials in the furnace and improve combustion efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a biomass circulating fluidized bed boiler with an adjustable longitudinal intercept secondary air inlet to solve the problems raised in the above background technology.

[0006] The purpose of the utility model is achieved through the following technical solutions: a biomass circulating fluidized bed boiler with an adjustable longitudinal intercept secondary air inlet, comprising a biomass circulating fluidized bed boiler, wherein a secondary air inlet structure is longitudinally arranged on the front / rear wall of the biomass circulating fluidized bed boiler, wherein the secondary air inlet structure is arranged at the furnace and the throat of the first flue of the biomass circulating fluidized bed boiler, wherein the secondary air inlet structure includes a secondary air distribution duct, wherein the secondary air distribution duct is connected to a secondary air inlet duct, wherein an end of the secondary air inlet duct away from the secondary air distribution duct passes through the biomass circulating fluidized bed boiler and extends to the outside of the biomass circulating fluidized bed boiler;

[0007] The longitudinally adjustable gate valve is detachably arranged on the spaced secondary air inlet duct.

[0008] Furthermore, the secondary air inlet structures are located at the front / rear wall positions and are arranged in a staggered manner.

[0009] Furthermore, the secondary air inlet structures are located at the front / rear wall in a staggered arrangement, including the secondary air inlet structures on the front wall being arranged at inclined intervals;

[0010] The secondary air inlet structures on the rear wall are arranged at horizontal intervals.

[0011] Furthermore, the secondary air inlet structures are located at the front / rear wall in a staggered arrangement, including the secondary air inlet structures on the front wall being arranged at intervals horizontally;

[0012] The secondary air inlet structures on the rear wall are arranged at horizontal intervals.

[0013] Furthermore, the secondary air inlet structure is located at the front / rear wall and is arranged in a hedge manner.

[0014] Furthermore, the nozzle provided on the secondary air port structure adopts a jet-type air supply port, and the nozzle is installed in a spherical or hemispherical shell.

[0015] Furthermore, the length of the nozzle is set to 180-350 mm, and the nozzle can be tilted along the spherical or hemispherical shell at an angle of 20-90°.

[0016] Furthermore, the secondary air inlet structure is arranged at a height that is one third of the furnace height of the biomass circulating fluidized bed boiler.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The utility model can control the air intake volume of the secondary air duct from the outside, improve work efficiency and use efficiency, promote the mixing of materials in the furnace and improve combustion efficiency.

[0019] The utility model adopts different forms of secondary air outlet structures arranged on the front / rear walls, so that two groups of air form convection, which is beneficial to the full combustion of fuel, improves combustion efficiency, reduces emissions of carbon monoxide, etc., and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the utility model;

[0021] Figure 2 This is an enlarged schematic diagram of the biomass circulating fluidized bed boiler and secondary air inlet structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the staggered arrangement of the front and rear walls of the secondary air outlet structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the hedging arrangement of the front / rear wall positions of the secondary air outlet structure of the utility model;

[0024] Figure 5 It is a schematic diagram of the nozzle form of the utility model. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0027] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] like Figure 1-5 As shown, a biomass circulating fluidized bed boiler with an adjustable longitudinal intercept secondary air inlet includes a biomass circulating fluidized bed boiler 1, a secondary air inlet structure 2 is longitudinally arranged on the front / rear wall of the biomass circulating fluidized bed boiler 1, the secondary air inlet structure 2 is arranged at the furnace and the first flue throat of the biomass circulating fluidized bed boiler 1, the secondary air inlet structure 2 includes a secondary air distribution duct 2-1, the secondary air distribution duct 2-1 is fixedly installed in the biomass circulating fluidized bed boiler 1, and the secondary air distribution duct 2-1 is connected to a secondary air inlet duct 2-2, and the end of the secondary air inlet duct 2-2 away from the secondary air distribution duct 2-1 passes through the biomass circulating fluidized bed boiler 1 and extends to the outside of the biomass circulating fluidized bed boiler 1;

[0029] A longitudinally adjustable gate valve 3 is provided on the secondary air inlet duct 2 - 2 , and the longitudinally adjustable gate valve 3 is provided on the secondary air inlet duct 2 - 2 at intervals.

[0030] A secondary air distribution duct 7 is installed on the furnace front arch 5. The longitudinally adjustable gate valve 3 adopts an electric gate valve structure. The model disclosed in the prior art is: QZM electric gate valve, and its material is Q235, SS304, and SS316.

[0031] In order to facilitate the extension of the residence time by the staggered secondary air inlet structure in the use state, the secondary air inlet structure 2 is located at the front / rear wall position and is staggered. The secondary air inlet structure 2 is located at the front / rear wall position and is staggered, including the secondary air inlet structure 2 on the front wall being arranged at an inclined interval;

[0032] The secondary air inlet structures 2 on the rear wall are arranged at horizontal intervals.

[0033] The secondary air inlet structures are located at the front / rear wall and are arranged in a staggered manner, including the secondary air inlet structures 2 on the front wall being arranged at intervals horizontally;

[0034] The secondary air inlet structures 2 on the rear wall are arranged at horizontal intervals.

[0035] In order to facilitate extending the residence time by staggered secondary air inlet structures during use, another different design structure is that the secondary air inlet structure 2 is located at the front / rear wall position and is set in a hedge manner.

[0036] In order to facilitate the use of a jet-type air supply structure during use, the nozzle 4 provided on the secondary air outlet structure 2 adopts a jet-type air supply outlet. The nozzle 4 is installed on the secondary air distribution duct 2-1. The nozzle 4 is rotatably installed in a spherical or hemispherical shell. The length of the nozzle 4 is set to 180-350mm, and the nozzle can be tilted along the spherical or hemispherical shell at an angle of 20-90°.

[0037] In order to increase the effect of the secondary air on the combustibles in the furnace during use, the secondary air inlet structure 2 is arranged at a height of one third of the furnace height of the biomass circulating fluidized bed boiler 1 .

[0038] The secondary air structures arranged on the front and rear walls adopt different air inlet speeds, wherein the wind speed of the secondary air structure arranged on the rear wall is greater than the wind speed of the secondary air structure arranged on the front wall.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0040] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A biomass circulating fluidized bed boiler with an adjustable longitudinal intercept secondary air inlet, comprising a biomass circulating fluidized bed boiler (1), characterized in that: A secondary air inlet structure (2) is longitudinally arranged on the front / rear wall of the biomass circulating fluidized bed boiler (1); the secondary air inlet structure (2) is arranged at the furnace and the throat of the first flue of the biomass circulating fluidized bed boiler (1); the secondary air inlet structure (2) comprises a secondary air distribution duct (2-1); the secondary air distribution duct (2-1) is connected to a secondary air inlet duct (2-2); an end of the secondary air inlet duct (2-2) away from the secondary air distribution duct (2-1) passes through the biomass circulating fluidized bed boiler (1) and extends to the outside of the biomass circulating fluidized bed boiler (1); A longitudinally adjustable gate valve (3) is provided on the secondary air inlet duct (2-2), and the longitudinally adjustable gate valve (3) is detachably arranged on the spaced secondary air inlet duct (2-2).

2. The biomass circulating fluidized bed boiler longitudinal intercept adjustable secondary air inlet according to claim 1, characterized in that: The secondary air inlet structure (2) is located at the front / rear wall and is arranged in a staggered manner.

3. The biomass circulating fluidized bed boiler longitudinal intercept adjustable secondary air inlet according to claim 2, characterized in that: The secondary air inlet structures (2) are located at the front / rear wall positions and are arranged in a staggered manner, including the secondary air inlet structures (2) on the front wall being arranged at inclined intervals; The secondary air outlet structures (2) on the rear wall are arranged at intervals horizontally.

4. The biomass circulating fluidized bed boiler longitudinal intercept adjustable secondary air inlet according to claim 2, characterized in that: The secondary air outlet structures are located at the front / rear wall positions and are arranged in a staggered manner, including the secondary air outlet structures (2) on the front wall being arranged at intervals horizontally; The secondary air outlet structures (2) on the rear wall are arranged at intervals horizontally.

5. The biomass circulating fluidized bed boiler longitudinal intercept adjustable secondary air inlet according to claim 2, characterized in that: The secondary air inlet structure (2) is located at the front / rear wall and is arranged in a counter-hedge arrangement.

6. The biomass circulating fluidized bed boiler longitudinal intercept adjustable secondary air inlet according to claim 5, characterized in that: The nozzle (4) arranged on the secondary air port structure (2) adopts a jet-type air supply port, and the nozzle (4) is installed in a spherical or hemispherical shell.

7. The biomass circulating fluidized bed boiler longitudinal intercept adjustable secondary air inlet according to claim 6, characterized in that: The length of the nozzle (4) is set to 180-350 mm, and the nozzle can be tilted along the spherical or hemispherical shell at an angle of 20-90°.

8. The biomass circulating fluidized bed boiler longitudinal intercept adjustable secondary air inlet according to claim 7, characterized in that: The secondary air inlet structure (2) is arranged at a height that is one third of the furnace height of the biomass circulating fluidized bed boiler (1).

Images