Boiler device

Abstract

The utility model discloses a boiler device which comprises a boiler body, at least one upper secondary air inlet, at least one lower secondary air inlet, at least one lower secondary air inlet and at least one lower secondary air inlet. The at least one upper secondary air guide pipe is arranged on the outer side of the boiler body, and one end of the upper secondary air guide pipe is communicated with the upper secondary air inlet; and at least one combustible gas spray gun, wherein each combustible gas spray gun is inserted into one upper secondary air guide pipe. According to the boiler device, combustible low-heat-value waste gas can be effectively recycled, and energy waste and environmental pollution are reduced.

Description

Technical Field

[0001] This application relates to the technical field of combustion equipment, and in particular to a boiler device. Background Art

[0002] During the production process of chemical plants, low-calorific-value waste gas is generated. Usually, the low-calorific-value waste gas is treated by flare combustion. However, using the flare combustion method to burn low-calorific-value waste gas not only causes energy waste, resulting in high overall energy consumption of chemical plants, but also causes environmental pollution.

[0003] Therefore, how to realize the recycling of low-calorific-value waste gas has become an urgent problem to be solved in this field. Summary of the Utility Model

[0004] The boiler device provided by this application can effectively recycle combustible low-calorific-value waste gas, reduce energy waste and environmental pollution.

[0005] This application provides a boiler device, wherein the boiler device includes:

[0006] A boiler body with at least one upper secondary air inlet provided on its side wall;

[0007] At least one upper secondary air duct is arranged outside the boiler body, and one end of the upper secondary air duct is communicated with the upper secondary air inlet;

[0008] At least one combustible gas spray gun, and each combustible gas spray gun is inserted into one of the upper secondary air ducts.

[0009] For the boiler device as described above, wherein the combustible gas spray gun includes:

[0010] A housing, having a tubular structure, and one end is communicated with a combustible gas supply pipeline;

[0011] A nozzle, connected to the other end of the housing, and at least one spray hole is provided on the nozzle;

[0012] A swirler is arranged inside the housing, and the swirler is used to accelerate the combustible gas flowing through the inside of the housing.

[0013] For the boiler device as described above, wherein the combustible gas spray gun is coaxially inserted into the upper secondary air duct; the inner diameter of the upper secondary air duct is 100 cm to 250 cm; the outer diameter of the combustible gas spray gun is 60 cm to 120 cm.

[0014] The boiler device as described above, wherein, in a state where the combustible gas spray gun is inserted into the upper secondary air duct, along the direction close to the boiler body, the through direction of the spray holes inclines upward, and an angle of 0° to 45° is formed between the through direction of the spray holes and the axial direction of the upper secondary air duct.

[0015] The boiler device as described above, wherein, along the through direction of the corresponding upper secondary air inlet, the size of the nozzle head is 5 cm to 15 cm, and the distance between the nozzle head and the boiler body is 20 cm to 50 cm.

[0016] The boiler device as described above, wherein the equivalent diameter of the spray holes is 20 mm to 80 mm.

[0017] The boiler device as described above, wherein, along the direction close to the boiler body, the upper secondary air duct inclines downward; an angle of 20° to 25° is formed between the upper secondary air duct and the horizontal plane.

[0018] The boiler device as described above, wherein at least one lower secondary air inlet is provided on the side wall, and the boiler device further includes at least one lower secondary air duct, and one end of each lower secondary air duct is communicated with one of the lower secondary air inlets;

[0019] And / or, at least one solid fuel inlet is provided on the side wall, and the boiler device further includes at least one feed pipe, and one end of each feed pipe is communicated with one of the solid fuel inlets.

[0020] The boiler device as described above, wherein the boiler body is arranged in the vertical direction;

[0021] The side wall includes a front water-cooled wall, a rear water-cooled wall and two side water-cooled walls. The front water-cooled wall and the rear water-cooled wall are arranged opposite to each other. The two side water-cooled walls are respectively connected between the front water-cooled wall and the rear water-cooled wall, and the two side water-cooled walls are arranged opposite to each other;

[0022] At least one of the upper secondary air ducts, at least one of the lower secondary air ducts and at least one of the feed pipes are respectively connected to the front water-cooled wall and / or the rear water-cooled wall.

[0023] The boiler device as described above, wherein, along the vertical direction, the projections of the upper secondary air ducts, the projections of the lower secondary air ducts and the projections of the feed pipes are staggered.

[0024] The boiler device provided by the present application can send low-calorific-value waste gas into the interior of the boiler body by arranging a combustible gas spray gun in the upper secondary air duct, enabling it to mix with air for combustion, effectively realizing the recycling of low-calorific-value waste gas, reducing energy waste and environmental pollution, and reducing the overall energy consumption of the boiler device. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 Structural schematic diagram of the boiler device provided by the present application;

[0027] Figure 2 Structural schematic diagram of the combustible gas spray gun of the boiler device provided by the present application;

[0028] Figure 3 Structural schematic diagram of one end of the combustible gas spray gun of the boiler device provided by the present application inserted into the upper secondary air duct;

[0029] Figure 4 End face structural schematic diagram of one end of the combustible gas spray gun of the boiler device provided by the present application inserted into the upper secondary air duct;

[0030] Figure 5 Layout diagram of the upper secondary air inlet, lower secondary air inlet and solid fuel inlet on the front water wall of the boiler device provided by the present application.

[0031] Explanation of the reference numerals in the drawings:

[0032] 1. Boiler body; 11. Side wall; 111. Upper secondary air inlet; 112. Lower secondary air inlet; 113. Solid fuel inlet; 114. Front water wall; 115. Rear water wall; 116. Side water wall; 2. Upper secondary air duct; 3. Combustible gas spray gun; 31. Housing; 32. Nozzle; 321. Spray hole; 33. Swirler; 4. Lower secondary air duct; 5. Feed pipe. Detailed Embodiments

[0033] The following will describe in detail the embodiments of the present application. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0034] Circulating fluidized bed boilers are new and advanced combustion equipment that has received much attention in recent years. They have high combustion efficiency and flexibility, can adapt to the characteristics and supply situations of different fuels, and have a wide fuel adaptability. In addition, they also have advantages such as good environmental protection and strong load regulation ability, and are widely used in many fields such as power generation, industrial production, chemical industry, waste treatment, and biomass energy utilization.

[0035] Now, in the production process of chemical plants, low calorific value waste gas is generated. Burning the waste gas by means of flare combustion not only causes energy waste, resulting in high overall energy consumption of chemical plants, but also brings environmental pollution.

[0036] Therefore, disposing of the combustible low calorific value waste gas in the circulating fluidized bed boiler of the power station in the chemical plant can reduce the production cost and energy consumption of the chemical plant, and achieve the organic unity of energy conservation, environmental protection, and economic benefits, and has good popularization and application value.

[0037] However, if we want to achieve co-firing of combustible low calorific value waste gas, we need to solve the problem of introducing the combustible waste gas into the furnace for combustion. Based on this, this application proposes a boiler device to solve the introduction problem when the circulating fluidized bed boiler co-fires combustible low calorific value waste gas.

[0038] As Figures 1 to 3 shown, this application provides a boiler device, wherein the boiler device includes a boiler body 1, at least one upper secondary air duct 2, and at least one combustible gas spray gun 3.

[0039] The boiler body 1 is arranged vertically, and the boiler body 1 has an annular side wall 11 perpendicular to the horizontal plane. The side wall 11 can be a circular ring structure or a polygonal ring structure.

[0040] At least one upper secondary air inlet 111 is provided on the side wall 11 to supply secondary air into the interior of the boiler body 1 during the combustion of the fuel inside the boiler body 1, supplement oxygen to the interior of the boiler body 1, and improve the fuel combustion sufficiency.

[0041] The upper secondary air duct 2 is connected and arranged outside the boiler body 1, and one end of the upper secondary air duct 2 is communicated with the upper secondary air inlet 111 to achieve the smooth introduction of gas during the secondary air supply process.

[0042] Each combustible gas spray gun 3 is inserted into an upper secondary air duct 2, and the combustible low calorific value waste gas can be sprayed into the upper secondary air duct 2 through the combustible gas spray gun 3 to be mixed with the air introduced into the interior of the boiler body 1 by the upper secondary air duct 2 and enter the interior of the boiler body 1 for combustion, so as to realize the recycling of low calorific value waste gas, reduce energy waste and environmental pollution, and reduce the overall energy consumption of the boiler device.

[0043] As shown Figures 1 to 3 in the figure, the boiler device provided by the present application, wherein the combustible gas spray gun 3 includes a housing 31, a spray head 32 and a swirler 33.

[0044] The housing 31 has a tubular structure, and one end is connected to the combustible gas supply pipeline to realize the supply of low-calorie waste gas into the interior of the combustible gas spray gun 3.

[0045] The spray head 32 is hermetically connected to the other end of the housing 31. At least one spray hole 321 is provided on the spray head 32. The low-calorie waste gas is sprayed into the corresponding upper secondary air duct 2 and the interior of the boiler body 1 through the spray hole 321. By providing the spray head 32 and arranging the spray hole 321 on the spray head 32, compared with the inner diameter of the housing 31, the flow area of the low-calorie waste gas can be reduced. On the premise of a certain flow rate, reducing the flow area can increase the flow velocity of the low-calorie waste gas, so that the low-calorie waste gas enters the interior of the boiler body 1 in a jet state, which is beneficial to improving the mixing uniformity of the low-calorie waste gas and the air inside the boiler body 1 and enhancing the combustion efficiency of the low-calorie waste gas.

[0046] The swirler 33 is arranged inside the housing 31. The swirler 33 is used to accelerate the combustible gas flowing through the interior of the housing 31, further increasing the jet velocity of the low-calorie waste gas.

[0047] As shown Figure 1 in, Figure 2 and Figure 4 in the figure, the boiler device provided by the present application, wherein the combustible gas spray gun 3 is coaxially inserted into the upper secondary air duct 2 to ensure the uniformity of air supply in the upper secondary air duct 2, which is beneficial to improving the mixing uniformity of air and low-calorie waste gas.

[0048] The inner diameter R of the upper secondary air duct 2 is 100 cm to 250 cm; the outer diameter r of the combustible gas spray gun 3 is 60 cm to 120 cm. While ensuring the flow area of the low-calorie waste gas, the flow area available for air circulation in the corresponding upper secondary air duct 2 is ensured. It should be noted that the inner diameter of the upper secondary air duct 2 and the outer diameter of the combustible gas spray gun 3 can be adjusted according to the size of the boiler body 1 to be applied.

[0049] As shown Figure 3As shown in the figure, the boiler device provided by the present application. When the combustible gas spray gun 3 is inserted into the upper secondary air duct 2, along the direction close to the boiler body 1, the through direction of the spray hole 321 is inclined upward, and an included angle α of 0° to 45° is formed between the through direction of the spray hole 321 and the axial direction of the upper secondary air duct 2. In this way, the low calorific value waste gas can be sprayed to a position close to the upper part inside the boiler body 1, so as to make full use of the air in the upper part inside the boiler body 1 that has not been mixed and burned with the fuel. While ensuring the full combustion of the low calorific value waste gas, it will not overly occupy the air required for the combustion of solid fuel at the bottom of the boiler body 1, and improve the overall combustion efficiency of the boiler device.

[0050] As Figure 3 shown in the figure, for the boiler device provided by the present application, along the through direction of the corresponding upper secondary air inlet 111, the size L of the nozzle head 32 is 5 cm to 15 cm, so as to provide sufficient depth for the spray hole 321 and ensure the guiding effect of the spray hole 321 on the spraying direction of the low calorific value waste gas.

[0051] The distance between the nozzle head 32 and the boiler body 1 is 20 cm to 50 cm, so that the low calorific value waste gas is ejected inside the end of the upper secondary air duct 2 close to the boiler body 1, and starts to mix with air before entering the boiler body 1, which is beneficial to improving the combustion sufficiency of the low calorific value waste gas after entering the boiler body 1. At the same time, compared with the scheme where the nozzle head 32 extends into the boiler body 1, the temperature at the position where the nozzle head 32 is located can be reduced, and the service life of the nozzle head 32 can be improved.

[0052] Optionally, the equivalent diameter of the spray hole 321 is 20 mm to 80 mm. Specifically, the number of spray holes 321 can be set to at least one, and the aperture of the spray hole 321 can be adjusted according to the number of spray holes 321, as long as the sum of the flow areas of all spray holes 321 meets the design requirements.

[0053] As Figure 3 shown in the figure, for the boiler device provided by the present application, along the direction close to the boiler body 1, the upper secondary air duct 2 is inclined downward; an included angle β of 20° to 25° is formed between the upper secondary air duct 2 and the horizontal plane. In this way, a part of the air sprayed into the inside of the boiler body 1 from the annular space between the upper secondary air duct 2 and the combustible gas spray gun 3 can reach the bottom position inside the boiler body 1, so as to supplement oxygen for the solid fuel at the bottom inside the boiler body 1 and improve the combustion efficiency of the solid fuel.

[0054] As Figure 1As shown, the boiler device provided by the present application, wherein at least one lower secondary air inlet 112 is provided on the side wall 11. Along the vertical direction, the position of the lower secondary air inlet 112 is lower than that of the upper secondary air inlet 111. The lower secondary air inlet 112 is directly used to supply air to the inner bottom of the boiler body 1, improving the combustion sufficiency of solid fuel.

[0055] The boiler device further includes at least one lower secondary air duct 4. One end of each lower secondary air duct 4 is communicated with a lower secondary air inlet 112. Similarly, along the direction close to the boiler body 1, the lower secondary air duct 4 inclines downward, so as to effectively ensure that the supplied air is sent to the inner bottom of the boiler body 1 to participate in the combustion of solid fuel.

[0056] As Figure 1 shown, the boiler device provided by the present application, wherein at least one solid fuel inlet 113 is provided on the side wall 11. Along the vertical direction, the solid fuel inlet 113 is provided at the bottom position of the boiler body 1. The boiler device further includes at least one feeding pipe 5. One end of each feeding pipe 5 is communicated with a solid fuel inlet 113. By providing the feeding pipe 5, solid fuel can be guided into the boiler body 1.

[0057] As Figure 5 shown, the boiler device provided by the present application, wherein the side wall 11 includes a front water-cooled wall 114, a rear water-cooled wall 115 and two side water-cooled walls 116. The front water-cooled wall 114 and the rear water-cooled wall 115 are arranged oppositely. The two side water-cooled walls 116 are respectively connected between the front water-cooled wall 114 and the rear water-cooled wall 115, and the two side water-cooled walls 116 are arranged oppositely, enclosing a rectangular ring structure.

[0058] At least one upper secondary air duct 2, at least one lower secondary air duct 4 and at least one feeding pipe 5 are respectively connected to the front water-cooled wall 114 and / or the rear water-cooled wall 115.

[0059] Figure 5 Taking the front water-cooled wall 114 as an example for illustration, six upper secondary air inlets 111 are provided thereon, which can be connected to six upper secondary air ducts 2. Six lower secondary air inlets 112 are provided, and it can be understood that there are six lower secondary air ducts 4. Four solid fuel inlets 113 are provided, and it can be understood that there are four feeding pipes 5. It should be noted that the numbers of the upper secondary air inlets 111, the lower secondary air inlets 112 and the solid fuel inlets 113 can be adjusted according to the design size of the boiler body 1, and the present application is not limited thereto.

[0060] As Figure 5As shown in the figure, the boiler device provided by the present application has the projections of the upper secondary air ducts 2, the projections of the lower secondary air ducts 4, and the projections of the feeding pipes 5 staggered along the vertical direction. This can effectively improve the uniformity of air supply into the boiler body 1, and at the same time reduce the interference between the air supply operation and the solid fuel supply operation.

[0061] In the boiler device provided by the present application, by arranging combustible gas spray guns 3 in the upper secondary air ducts 2, low-calorie waste gas can be sent into the interior of the boiler body 1, mixed with air for combustion, effectively realizing the recovery and utilization of low-calorie waste gas, reducing energy waste and environmental pollution, and reducing the overall energy consumption of the boiler device.

[0062] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0063] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "middle", "rear", "left", "right", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 should not be construed as a limitation of the present application.

[0064] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0065] The above is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described systems, modules, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present application.

Claims

1. A boiler device, characterized in that, The boiler device includes: A boiler body (1) with at least one upper secondary air inlet (111) opened on the side wall (11); At least one upper secondary air duct (2) provided outside the boiler body (1), and one end of the upper secondary air duct (2) is communicated with the upper secondary air inlet (111); At least one combustible gas spray gun (3), and each combustible gas spray gun (3) is inserted into one of the upper secondary air ducts (2).

2. The boiler device according to claim 1, characterized in that, The combustible gas spray gun (3) includes: A housing (31) in a tubular structure, and one end is communicated with a combustible gas supply pipeline; A spray head (32) connected to the other end of the housing (31), and at least one spray hole (321) is opened on the spray head (32); A swirler (33) provided inside the housing (31), and the swirler (33) is used to accelerate the combustible gas flowing through the inside of the housing (31).

3. The boiler device according to claim 2, characterized in that, The combustible gas spray gun (3) is coaxially inserted into the upper secondary air duct (2); the inner diameter of the upper secondary air duct (2) is 100 cm to 250 cm; the outer diameter of the combustible gas spray gun (3) is 60 cm to 120 cm.

4. The boiler device according to claim 2, characterized in that In the state where the combustible gas spray gun (3) is inserted into the upper secondary air duct (2), along the direction close to the boiler body (1), the through direction of the spray hole (321) is inclined upward, and an angle of 0° to 45° is formed between the through direction of the spray hole (321) and the axial direction of the upper secondary air duct (2).

5. The boiler device according to claim 2, characterized in that, Along the through direction of the corresponding upper secondary air inlet (111), the size of the spray head (32) is 5 cm to 15 cm, and the distance between the spray head (32) and the boiler body (1) is 20 cm to 50 cm.

6. The boiler device according to claim 2, characterized in that, The equivalent diameter of the spray hole (321) is 20 mm to 80 mm.

7. The boiler device according to any one of claims 1 to 6, characterized in that Along the direction close to the boiler body (1), the upper secondary air duct (2) is inclined downward; an angle of 20° to 25° is formed between the upper secondary air duct (2) and the horizontal plane.

8. The boiler device according to claim 1, characterized in that, At least one lower secondary air inlet (112) is opened on the side wall (11), and the boiler device further includes at least one lower secondary air duct (4), and one end of each lower secondary air duct (4) is communicated with one of the lower secondary air inlets (112); And / or, at least one solid fuel inlet (113) is opened on the side wall (11), and the boiler device further includes at least one feed pipe (5), and one end of each feed pipe (5) is communicated with one of the solid fuel inlets (113).

9. The boiler device according to claim 8, characterized in that, The boiler body (1) is arranged in the vertical direction; The side wall (11) includes a front water-cooled wall (114), a rear water-cooled wall (115) and two side water-cooled walls (116), the front water-cooled wall (114) and the rear water-cooled wall (115) are arranged oppositely, the two side water-cooled walls (116) are respectively connected between the front water-cooled wall (114) and the rear water-cooled wall (115), and the two side water-cooled walls (116) are arranged oppositely; At least one of the upper secondary air ducts (2), at least one of the lower secondary air ducts (4), and at least one of the feed pipes (5) are respectively connected to the front water wall (114) and / or the rear water wall (115).

10. The boiler device according to claim 9, characterized in that, In the vertical direction, the projections of the upper secondary air ducts (2), the projections of the lower secondary air ducts (4), and the projections of the feed pipes (5) are staggered.

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