Light boiler wall structure for low-temperature area of tail flue of circulating fluidized bed boiler

Abstract

The utility model relates to a boiler wall structure, in particular to a light boiler wall structure for a low-temperature area of a tail flue of a circulating fluidized bed boiler. The utility model aims to solve the problems of complex structure, high material consumption, high construction difficulty, heavy weight, long time consumption in the whole construction period and high construction cost of the conventional furnace wall. The furnace wall comprises a furnace wall frame, an upper steel frame cross beam, a lower steel frame cross beam and a guard plate frame steel plate, the guard plate frame steel plate is fixedly connected to the inner side of the furnace wall frame, the bottom of the furnace wall frame is fixedly connected to the lower steel frame cross beam, the upper steel frame cross beam is arranged above the furnace wall frame, and a gap is formed between the upper steel frame cross beam and the furnace wall frame. A first sealing steel plate is fixedly connected to the outer side between the upper steel frame beam and the furnace wall frame, first flat steel is arranged on the inner side between the upper steel frame beam and the furnace wall frame, and the lower end of the first flat steel is fixedly connected with the furnace wall frame. The utility model is used for providing the furnace wall structure.

Description

Technical Field

[0001] The utility model relates to a boiler furnace wall structure, in particular to a light furnace wall structure used in a low-temperature zone of a tail flue of a circulating fluidized bed boiler. Background Art

[0002] Circulating fluidized bed boilers (CFBs) have experienced rapid development nationwide due to their wide fuel adaptability, excellent environmental performance, wide load regulation range, and easy comprehensive utilization of ash and slag. With increasingly stringent environmental protection requirements, the industry generally believes that CFBs are one of the most practical and feasible high-efficiency, low-pollution coal-fired equipment. Consequently, their market share and proportion of newly built CFBs have increased significantly.

[0003] The tail flue of a traditional circulating fluidized bed boiler utilizes a brick-built furnace wall structure. The brick walls are typically 245-360mm thick and are typically constructed of refractory bricks and insulation bricks. Brick support beams and brick hooks are placed vertically to support and limit the brick walls to ensure structural stability. While this type of furnace wall structure is relatively mature, it presents challenges such as complex structure, high material consumption, difficulty in construction, heavy furnace wall weight, long construction time, and high construction costs. Utility Model Content

[0004] In order to solve the problems of complex structure of existing furnace wall, large material consumption, great construction difficulty, heavy furnace wall, long overall construction period and high furnace wall construction cost, the utility model proposes a lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler includes a furnace wall frame, an upper steel frame crossbeam, a lower steel frame crossbeam and a guard plate frame steel plate. The guard plate frame steel plate is fixedly connected to the inner side of the furnace wall frame, and the bottom of the furnace wall frame is fixedly connected to the lower steel frame crossbeam. The upper steel frame crossbeam is arranged above the furnace wall frame and has a gap between it and the furnace wall frame. A first sealing steel plate is fixedly connected to the outer side between the upper steel frame crossbeam and the furnace wall frame, and a first flat steel is provided on the inner side between the upper steel frame crossbeam and the furnace wall frame. The lower end of the first flat steel is fixedly connected to the furnace wall frame.

[0007] Furthermore, the furnace wall frame is in the shape of a cuboid, and the four sides of the furnace wall frame include a plurality of horizontally arranged guard plate frames, the guard plate frames are in the shape of a rectangle, and a guard plate frame steel plate is fixed to the inner side of each guard plate frame.

[0008] Furthermore, the guard plate frame is rectangular in shape, the upper and lower sides of the guard plate frame are horizontal channel steels with grooves set inward, the left and right sides of the guard plate frame are vertical channel steels with grooves set inward, a group of I-beams are fixed between the vertical channel steels on both sides of the guard plate frame, a gap is provided between the adjacent vertical channel steels of two adjacent guard plate frames, and a sealing steel plate expansion joint is fixed on the outer side between the two adjacent vertical channel steels, a second flat steel is provided on the inner side between the two adjacent vertical channel steels, and the second flat steel is fixed to the side wall of one of the vertical channel steels.

[0009] Furthermore, the lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler also includes a support beam, which is vertically inserted into the guard frame steel plate, and the end of the support beam is fixedly connected to the lower steel frame crossbeam through a supporting device.

[0010] Furthermore, a second sealing steel plate is fixedly connected between the outer side wall of the guard plate frame steel plate and the side wall of the support beam.

[0011] Furthermore, the support device includes a support plate and a support frame, the lower end of the support frame is fixedly connected to the lower steel frame beam, the upper end of the support frame is fixedly connected to the lower end of the support plate, and the upper end of the support plate is supported below the end of the support beam.

[0012] Furthermore, a beam heat insulation layer is provided on the inner side of the upper steel frame beam and the lower steel frame beam, and an impact-resistant protective layer is provided on the outer side of the beam heat insulation layer.

[0013] Furthermore, the crossbeam heat insulation layer is an aluminum silicate fiber felt layer, and the impact-resistant protective layer is a phosphate concrete layer.

[0014] Furthermore, the outer side of the guard plate frame steel plate is provided with a steel plate insulation layer, a heat preservation layer and a support and protection layer in sequence from the inside to the outside.

[0015] Furthermore, the steel plate heat insulation layer is an aluminum silicate fiber felt layer, the thermal insulation layer is a rock wool layer, and the supporting and protective layer is a color steel corrugated board.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] This utility model aims to provide a lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler. It can be used in furnace walls where the flue gas temperature in the tail flue is below 400°C. This structure not only addresses issues such as furnace wall surface temperature, expansion of guard plates and support beams, heating surface support, and boiler sealing, but also effectively reduces material consumption, lowers furnace wall weight, eliminates furnace wall supports and limiting metal parts, shortens construction periods, reduces construction difficulty, and significantly lowers furnace wall construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main view of the overall structure of the utility model;

[0019] Figure 2 yes Figure 1 The enlarged view of point I in FIG.

[0020] Figure 3 It is a side view schematic diagram of the overall structure of the utility model;

[0021] Figure 4 It is a top view schematic diagram of the overall structure of the utility model;

[0022] Figure 5 yes Figure 4 The enlarged view of point II in the figure;

[0023] Figure 6 This is a schematic diagram of the main view of the support structure of the support beam in the present utility model;

[0024] Figure 7 It is a side view schematic diagram of the support structure of the support beam in the present utility model;

[0025] Figure 8 It is a schematic diagram of the furnace wall structure of the integral structure in the utility model. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Specific implementation method 1: Combination Figures 1 to 8 To illustrate this embodiment, the light furnace wall structure described in this embodiment for the low-temperature zone of the tail flue of a circulating fluidized bed boiler includes a furnace wall frame, an upper steel frame beam 6, a lower steel frame beam 7 and a guard frame steel plate 8. The guard frame steel plate 8 is fixedly connected to the inner side of the furnace wall frame, and the bottom of the furnace wall frame is fixedly connected to the lower steel frame beam 7. The upper steel frame beam 6 is arranged above the furnace wall frame, and a gap is provided between the upper steel frame beam 6 and the furnace wall frame. A first sealing steel plate 2 is fixedly connected to the outer side between the upper steel frame beam 6 and the furnace wall frame, and a first flat steel 5 is provided on the inner side between the upper steel frame beam 6 and the furnace wall frame. The lower end of the first flat steel 5 is fixedly connected to the furnace wall frame.

[0028] The guard frame steel plate 8 is installed in its entirety inside the furnace wall frame, which can effectively improve the utilization rate of the steel plate and reduce material loss. The furnace wall frame is installed inside the tail flue steel frame crossbeam to form the tail frame structure. The bottom of the furnace wall frame is welded to the lower steel frame crossbeam 7. A 20mm gap is left between the upper part of the furnace wall frame and the upper steel frame crossbeam 6. The outside is connected through the first sealing steel plate 2. The first sealing steel plate 2 is welded to the furnace wall frame and the upper steel frame crossbeam 6 on both sides. While ensuring sealing, it can absorb the thermal expansion of the furnace wall frame during operation. The internal first flat steel 5 is installed at the connection between the furnace wall frame and the upper steel frame crossbeam 6. The first flat steel 5 is welded to the furnace wall frame and not to the upper steel frame crossbeam 6. This structural form can effectively prevent dust in the flue gas from entering the gap between the furnace wall frame and the upper steel frame crossbeam 6 during boiler operation, ensuring normal expansion of the upper part of the furnace wall frame.

[0029] Specific implementation method 2: Combination Figures 1 to 7 This embodiment describes a furnace wall frame having a rectangular parallelepiped shape. Each of the four sides of the furnace wall frame includes a plurality of horizontally arranged rectangular guard frames 1, each of which has a guard frame steel plate 8 fixedly attached to its inner side. The undisclosed technical features of this embodiment are the same as those of the first embodiment.

[0030] Specific implementation method three: Combination Figures 1 to 7 This embodiment describes a rectangular guard frame 1. The upper and lower sides of the guard frame 1 are horizontal channel steels with inward notches, and the left and right sides of the guard frame 1 are vertical channel steels with inward notches. A set of I-beams is fixedly connected between the vertical channel steels on both sides of the guard frame 1. A gap is provided between adjacent vertical channel steels of two adjacent guard frame 1s, and a sealed steel plate expansion joint 4 is fixedly connected to the outer side between the two adjacent vertical channel steels. A second flat steel 9 is provided on the inner side between the two adjacent vertical channel steels, and the second flat steel 9 is fixedly connected to the side wall of one of the vertical channel steels. The undisclosed technical features of this embodiment are the same as those of the second specific embodiment.

[0031] The gap between two adjacent vertical channel steels is 20 mm. The external position of the gap is sealed by a sealing steel plate expansion joint 4. The sealing steel plate expansion joint 4 is welded to the two vertical channel steels to ensure sealing while effectively absorbing the thermal expansion generated by the guard plate frame 1 during operation. The internal position of the gap uses a second flat steel 9 installed at the two vertical channel steel positions. One side of the second flat steel 9 is fully welded to a vertical channel steel, and the other side is not welded to the other vertical channel steel to ensure that dust in the flue gas does not enter the gap position of the guard plate frame 1 during boiler operation, ensuring that the guard plate frame 1 expands normally in the horizontal position.

[0032] Specific implementation method four: Combination Figures 1 to 7This embodiment describes a lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler, further comprising a support beam 3. The support beam 3 is vertically mounted on a guard frame steel plate 8, with the ends of the support beam 3 being fixedly connected to the lower steel frame crossbeam 7 via a supporting device. The undisclosed technical features of this embodiment are the same as those of the first, second, or third embodiments.

[0033] The heating surface at the rear of the boiler is usually connected to the support beam 3 by a pipe clamp. The support beam 3 of the conventional brick furnace wall structure is directly connected to the guard plate frame 1. In the utility model, since the entire guard plate frame 1 is in a heated state, thermal stress and thermal expansion are large, a new structural form is required to ensure the support of the heating surface.

[0034] Specific implementation method five: combining 1 to Figure 7 In this embodiment, a second sealing steel plate 10 is fixedly connected between the outer side wall of the guard frame steel plate 8 and the side wall of the support beam 3. The undisclosed technical features of this embodiment are the same as those of the fourth embodiment.

[0035] The connection position between the support beam 3 and the guard frame steel plate 8 on the guard frame 1 is sealed and welded through a second sealing steel plate 10. This installation form can ensure the axial expansion of the support beam 3 and avoid the influence of thermal expansion on the support beam 3 during the operation of the guard frame 1.

[0036] Specific implementation method six: combining 1 to Figure 7 This embodiment describes the support device, which includes a support plate 12 and a support frame 11. The lower end of the support frame 11 is fixedly connected to the lower steel frame crossbeam 7. The upper end of the support frame 11 is fixedly connected to the lower end of the support plate 12. The upper end of the support plate 12 is supported below the end of the support beam 3. The undisclosed technical features of this embodiment are the same as those of the fourth embodiment.

[0037] The support beam 3 is externally supported by a support plate 12 and a support frame 11. The lower end of the support frame 11 is welded to the lower steel frame crossbeam 7, and the upper end is welded to the support plate 12. The upper end of the support plate 12 is not welded to the support beam 3 to ensure that the support beam 3 can expand freely in the axial direction. This structure not only ensures the support function of the support beam 3, but also effectively solves the problem of expansion caused by heat in various components during operation.

[0038] Specific implementation method seven: combination Figure 8 In this embodiment, the upper and lower steel frame crossbeams 6 and 7 are provided with crossbeam insulation layers 13 on the inner sides, and impact-resistant protective layers 14 on the outer sides of the crossbeam insulation layers 13. The undisclosed technical features of this embodiment are the same as those of the first embodiment.

[0039] Specific implementation method eight: combination Figure 8In this embodiment, the crossbeam insulation layer 13 is an aluminum silicate fiber felt layer, and the impact-resistant protective layer 14 is a phosphate concrete layer. The undisclosed technical features of this embodiment are the same as those of the seventh embodiment.

[0040] The inner layer of the upper steel frame crossbeam 6 and the lower steel frame crossbeam 7 is arranged with a crossbeam insulation layer 13 of aluminum silicate fiber felt material, and the outer layer is arranged with an impact-resistant protective layer 14 of phosphate concrete material, so as to ensure the insulation of the steel frame crossbeam body and smooth smoke transition, while avoiding smoke scouring and wear.

[0041] Specific implementation method nine: combination Figure 8 In this embodiment, the outer side of the guard frame steel plate 8 is provided with a steel plate heat insulation layer 15, a heat preservation layer 16 and a support and protection layer 17 in order from the inside to the outside. The undisclosed technical features in this embodiment are the same as those in the first embodiment.

[0042] Specific implementation method ten: Combination Figure 8 In this embodiment, the steel plate heat insulation layer 15 is an aluminum silicate fiber felt layer, the thermal insulation layer 16 is a rock wool layer, and the supporting and protective layer 17 is a color-coated steel corrugated board. The undisclosed technical features of this embodiment are the same as those of the ninth embodiment.

[0043] The exterior of the guard frame steel plate 8 is first covered with a steel plate insulation layer 15 made of aluminum silicate fiber felt, and then with a rock wool insulation layer 16 to provide thermal insulation and ensure that the furnace wall surface temperature meets relevant standards. Simultaneously, the exterior of the insulation layer 16 is covered with a supporting protective layer 17 made of color-coated corrugated steel sheet to ensure a beautiful and neat appearance and prevent external moisture from entering the insulation wool and affecting the thermal insulation effect.

[0044] The utility model fully considers expansion, wear, sealing and operability during actual operation, has high practicality, and can be widely promoted and used.

[0045] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler, characterized by: The invention comprises a furnace wall frame, an upper steel frame crossbeam (6), a lower steel frame crossbeam (7) and a guard plate frame steel plate (8), wherein the guard plate frame steel plate (8) is fixedly connected to the inner side of the furnace wall frame, the bottom of the furnace wall frame is fixedly connected to the lower steel frame crossbeam (7), the upper steel frame crossbeam (6) is arranged above the furnace wall frame, and a gap is provided between the upper steel frame crossbeam (6) and the furnace wall frame, a first sealing steel plate (2) is fixedly connected to the outer side between the upper steel frame crossbeam (6) and the furnace wall frame, a first flat steel (5) is provided on the inner side between the upper steel frame crossbeam (6) and the furnace wall frame, and the lower end of the first flat steel (5) is fixedly connected to the furnace wall frame.

2. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 1, characterized in that: The furnace wall frame is in the shape of a rectangular parallelepiped, and comprises a plurality of horizontally arranged guard plate frames (1) on the four sides of the furnace wall frame. The guard plate frames (1) are in the shape of a rectangle, and a guard plate frame steel plate (8) is fixedly connected to the inner side of each guard plate frame (1).

3. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 2, characterized in that: The guard plate frame (1) is rectangular in shape, the upper and lower sides of the guard plate frame (1) are horizontal channel steels with inward notches, the left and right sides of the guard plate frame (1) are vertical channel steels with inward notches, a group of I-beams are fixedly connected between the vertical channel steels on both sides of the guard plate frame (1), a gap is provided between the adjacent vertical channel steels of two adjacent guard plate frames (1), and a sealing steel plate expansion joint (4) is fixedly connected to the outer side between the two adjacent vertical channel steels, a second flat steel (9) is provided on the inner side between the two adjacent vertical channel steels, and the second flat steel (9) is fixedly connected to the side wall of one of the vertical channel steels.

4. A lightweight furnace wall structure for a low-temperature zone of a tail flue of a circulating fluidized bed boiler according to claim 1, 2 or 3, characterized in that: The light furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler further comprises a support beam (3), the support beam (3) being vertically inserted into a guard plate frame steel plate (8), and the end of the support beam (3) being fixedly connected to a lower steel frame cross beam (7) via a support device.

5. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 4, characterized in that: A second sealing steel plate (10) is fixedly connected between the outer side wall of the guard frame steel plate (8) and the side wall of the support beam (3).

6. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 4, characterized in that: The supporting device comprises a support plate (12) and a support frame (11), the lower end of the support frame (11) is fixedly connected to the lower steel frame cross beam (7), the upper end of the support frame (11) is fixedly connected to the lower end of the support plate (12), and the upper end of the support plate (12) is supported below the end of the support beam (3).

7. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 1, characterized in that: A beam heat insulation layer (13) is provided on the inner side of the upper steel frame beam (6) and the lower steel frame beam (7), and an impact-resistant protective layer (14) is provided on the outer side of the beam heat insulation layer (13).

8. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 7, characterized in that: The crossbeam heat insulation layer (13) is an aluminum silicate fiber felt layer, and the impact-resistant protective layer (14) is a phosphate concrete layer.

9. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 1, characterized in that: The outer side of the guard frame steel plate (8) is provided with a steel plate heat insulation layer (15), a heat preservation layer (16) and a supporting protection layer (17) in sequence from the inside to the outside.

10. The lightweight furnace wall structure for the low-temperature zone of the tail flue of a circulating fluidized bed boiler according to claim 9, characterized in that: The steel plate heat insulation layer (15) is an aluminum silicate fiber felt layer, the heat preservation layer (16) is a rock wool layer, and the supporting and protective layer (17) is a color steel corrugated board.

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