Boiler with optimized rear arch structural strength

Abstract

The utility model relates to the technical field of boiler equipment, in particular to a boiler with optimized rear arch structural strength. The flue gas main guide wall is arranged above the front end of the rear arch and is used for guiding flue gas to flow; the collecting box is located in the middle of the main smoke guiding wall, the upper half portion of the main smoke guiding wall falls on the collecting box, the lower half portion of the main smoke guiding wall is installed on the rear arch, and the two ends of the collecting box are fixed in the boiler through a support. The smoke main guiding wall is divided into two parts, and the header structure is introduced, so that the gravity borne by the rear arch is effectively dispersed, the strain of the front end part of the rear arch caused by continuous load is obviously reduced, the strength and durability of the whole rear arch structure are enhanced, the problem of poor structural strength is effectively solved, and the service life of the rear arch is prolonged. And the overall service life of the boiler is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler equipment, in particular to a boiler with optimized rear arch structure strength. Background Art

[0002] As a device that converts the heat energy released by fuel combustion into working fluid heat energy, the boiler plays an important role in industrial production and energy supply. One of the core parts of the boiler is the furnace, and its internal vault structure is crucial to maintaining the stable operation of the boiler. The vault not only bears the high temperature and pressure inside the furnace, but also bears the gravity of the structure above, especially the weight of the flue gas guide wall.

[0003] In the traditional boiler design, the arch usually includes a front arch and a rear arch. The interval area between the front arch and the rear arch is used for the high-temperature flue gas in the furnace combustion chamber to pass through and enter the heat exchange area. The lower drum is usually arranged above the main part of the rear arch, and multiple flue gas guide walls are installed on the top of the lower drum. In order to fully heat the heat exchange tubes between the lower drum and the upper drum, an additional thicker flue gas guide wall is usually added on the front side of the lower drum to allow the flue gas from the furnace to quickly enter the diversion path, and the flue gas guide wall is directly built on the rear arch below. However, this design has some limitations. On the one hand, the rear arch structure directly bears the gravity of the flue gas guide wall. This continuous load may cause fatigue of the rear arch material, especially in high temperature environment, this fatigue is more serious. On the other hand, the contact point between the flue gas guide wall and the rear arch often produces stress concentration, which may cause the generation and expansion of cracks, further affecting the integrity of the structure. It can be seen that the flue gas guide wall directly acts on the rear arch, and is affected by the long-term scouring of high-temperature flue gas and the weight of the flue gas guide wall, which can easily cause strain on the rear arch material, reduce the structural strength, and shorten the service life of the boiler. Utility Model Content

[0004] The utility model aims to provide a boiler with an optimized rear arch structural strength, solve the problem of poor structural strength caused by easy wear of the rear arch, and increase the service life of the boiler.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solution: a boiler with optimized rear arch structure strength, comprising:

[0006] the rear arch, located in the furnace;

[0007] The main smoke guiding wall is set above the front end of the rear arch to guide the flow of smoke;

[0008] The header is located in the middle part of the main flue gas guide wall. The upper part of the main flue gas guide wall falls on the header, and the lower part of the main flue gas guide wall is installed on the rear arch. Both ends of the header are fixed in the boiler by brackets. The rear arch extends forward so that its front end face is closer to the combustion chamber of the furnace than the lower part of the main flue gas guide wall.

[0009] Preferably, the header is communicated with the lower boiler drum to increase the capacity of the lower boiler drum.

[0010] More preferably, the rear arch is composed of multiple rows of refractory bricks stacked side by side, the two rows of refractory bricks located at the front end are the first arch and the second arch, and the main guide wall of the flue gas in the lower part falls on the first arch and the second arch.

[0011] More preferably, the arch is made of wear-resistant high-temperature castable material.

[0012] More preferably, a layer of heat insulating material is further provided on the top surface of the rear arch, and the front end of the heat insulating material extends to between the main smoke guide wall and the rear arch.

[0013] More preferably, a flue gas inlet connecting the combustion chamber and the heat exchange zone is provided on one side of the main flue gas guide wall and the inner wall of the furnace, and a plurality of staggered flue gas auxiliary guide walls are provided at intervals on the top of the lower drum to guide the flue gas to flow along a Z-shaped path in the heat exchange zone.

[0014] More preferably, the lower drum is connected to the upper drum via a heat exchange tube.

[0015] More preferably, a crawler conveyor for transporting fuel is provided at the bottom of the furnace.

[0016] Compared with the prior art, the utility model divides the main flue gas guide wall into two and introduces a header structure, so that the gravity borne by the rear arch is effectively dispersed, which significantly reduces the strain on the front end of the rear arch caused by continuous load, thereby enhancing the strength and durability of the entire rear arch structure, effectively solving the problem of poor structural strength, and improving the overall service life of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure in an embodiment of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure in the AA and BB directions;

[0019] Figure 3 It is a schematic perspective view of the top structure in the embodiment.

[0020] In the figure:

[0021] 1——Rear arch 2——Furnace 3——Smoke main guide wall

[0022] 4——Header 5——Lower drum 6——Crawler conveyor

[0023] 7——Smoke auxiliary guide wall 8——Heat exchange tube 9——Smoke inlet

[0024] 10——Upper drum 1a——One arch 1b——Two arches. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0026] It should be noted in advance that, in the present utility model, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. In addition, in the present utility model, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature can include the first and second features directly contacting, and can also include the first and second features not being in direct contact but contacting through another feature between them.

[0027] like Figures 1 to 3 As shown, a boiler with optimized rear arch structural strength includes a rear arch 1, located in a furnace 2; a main flue gas guide wall 3, arranged above the front end of the rear arch 1, for guiding the flow of flue gas; a header 4, located in the middle part of the main flue gas guide wall 3, the upper part of the main flue gas guide wall 3 falls on the header 4, and the lower part of the main flue gas guide wall 3 is installed on the rear arch 1, and the two ends of the header 4 are fixed in the boiler by brackets. Those skilled in the art should know that the brackets are usually surrounded by refractory bricks after the boiler is stacked as a whole to avoid being affected by high temperature. The rear arch 1 extends forward so that its front end face is closer to the combustion chamber of the furnace 2 than the main flue gas guide wall 3 in the lower part.

[0028] In the above structure, the header 4 not only plays a role of structural support, but also increases the capacity of the lower drum 5 by being connected with the lower drum 5, increases the surface area of ​​heat exchange, and thus improves the heat exchange efficiency of the boiler.

[0029] In order to further reduce the stress concentration problem on the rear arch 1, the rear arch 1 is composed of multiple rows of refractory bricks stacked side by side. The two rows of refractory bricks located at the front end are the first arch 1a and the second arch 1b. The main flue gas guide wall 3 in the lower part falls on the first arch 1a and the second arch 1b. This design allows the first arch 1a and the second arch 1b to jointly bear the gravity of the main flue gas guide wall, so that the stress is more uniform, reducing the stress concentration point on the first arch 1a and reducing the risk of cracks. In addition, since the first arch 1a is at the front end of the rear arch 1, it is easy to directly contact the high-temperature flame in the furnace combustion chamber. Therefore, the first arch 1a in this embodiment is made of wear-resistant high-temperature castable to improve its durability and service life. In actual application, the main flue gas guide wall 3 of the lower part falls on the first arch 1a and the second arch 1b, and only a part of the first arch 1a and a part of the second arch 1b are needed to bear the weight together. Then the other part of the first arch 1a that does not bear the weight can be extended to the front end. Since this part is closer to the combustion chamber of the furnace, it is easy to be exposed to the high-temperature combustion flame, so it plays a role in protecting the load-bearing part of the first arch 1a, making the load-bearing part of the first arch 1a more reliable.

[0030] In addition, a layer of heat insulation material is provided on the top surface of the rear arch 1, and the front end of the heat insulation material extends between the main flue gas guide wall 3 and the rear arch 1. The thermal shock of the high-temperature flue gas on the rear arch 1 is effectively reduced, and the service life of the rear arch 1 is extended. For the heat insulation material, asbestos, ceramic limiters, calcium silicate boards and other materials suitable for high temperature environments can be selected. In this embodiment, asbestos material is preferred, which has excellent temperature resistance and heat insulation performance.

[0031] In this embodiment, a flue gas inlet 9 connecting the combustion chamber and the heat exchange area is provided on one side of the main flue gas guide wall 3 and the inner wall of the furnace 2, and a plurality of staggered flue gas auxiliary guide walls 7 are provided at intervals on the top of the lower drum 5 to guide the flue gas to flow along a Z-shaped path in the heat exchange area. This flow mode increases the residence time of the flue gas in the heat exchange area and further improves the heat exchange efficiency. The lower drum 5 is connected to the upper drum 10 through the heat exchange pipe 8, realizing the effective transmission and utilization of the internal heat energy of the boiler and improving the overall heat energy utilization rate.

[0032] In addition, a crawler conveyor 6 for transporting fuel is provided at the bottom of the furnace 2, which realizes the process of automatically transporting fuel, reduces manual intervention, and improves combustion efficiency and operational safety.

[0033] The working principle of the boiler with optimized rear arch structural strength provided by the above-mentioned embodiment is that during the operation of the boiler, the fuel is first automatically transported to the combustion chamber by the crawler conveyor 11 arranged at the bottom of the furnace 2. In the combustion chamber, the fuel is ignited and burns efficiently to release heat energy. The high-temperature flue gas generated by the combustion rises in the furnace and directly enters the area in front of the main flue gas guide wall 3, and a part of it contacts the rear arch 1. The rear arch 1 is composed of multiple rows of refractory bricks stacked side by side. The high temperature resistance of the refractory bricks effectively protects the rear arch 1 from high temperature damage. The flue gas further bypasses the main flue gas guide wall 3 through the flue gas inlet 9 and enters the heat exchange area. In the heat exchange area, the flue gas is guided by the multi-faceted flue gas auxiliary guide walls 7 so that it flows along a Z-shaped path, and is discharged from the end of the heat exchange area and enters the flue gas exhaust channel according to the contact time and contact area between the flue gas and the heat exchange surface. The heat energy of the flue gas passing through the heat exchange zone is effectively absorbed and converted into steam. The steam gathers in the upper drum 10 and increases in pressure, and is finally output through the steam pipeline for industrial purposes such as power generation or heating.

[0034] The utility model effectively disperses the gravity effect of the main flue gas guide wall 3 on the rear arch 1 by dropping the upper part of the main flue gas guide wall 3 on the header 4, and installing the lower part of the main flue gas guide wall 3 on the rear arch 1, and the header 4 is fixed to the inner wall of the furnace 2 through a bracket. At the same time, the main flue gas guide wall 3 of the lower part falls on the first arch 1a and the second arch 1b. This design reduces the stress concentration point of the first arch 1a, reduces the risk of cracks in the first arch 1a, and reliably guarantees the structural strength of the front end of the rear arch 1. Compared with the existing boilers, the strength of the rear arch structure after optimization of the utility model is better.

[0035] In order to make it easier for ordinary technicians in this field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and the above-mentioned embodiments are better implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. A boiler with optimized rear arch structure strength, characterized in that: include: A rear arch (1) located in the furnace (2); A main smoke guiding wall (3) is arranged above the front end of the rear arch (1) and is used to guide the flow of smoke; The header (4) is located in the middle part of the main flue gas guide wall (3), the upper part of the main flue gas guide wall (3) falls on the header (4), and the lower part of the main flue gas guide wall (3) is installed on the rear arch (1). Both ends of the header (4) are fixed in the boiler by brackets, and the rear arch (1) extends forward so that its front end surface is closer to the combustion chamber of the furnace (2) than the lower part of the main flue gas guide wall (3).

2. The boiler with optimized rear arch structure strength according to claim 1, characterized in that: The header (4) is in communication with the lower boiler drum (5) and is used to increase the capacity of the lower boiler drum (5).

3. The boiler with optimized rear arch structure strength according to claim 1, characterized in that: The rear arch (1) is composed of a plurality of rows of refractory bricks stacked side by side, the two rows of refractory bricks located at the front end are the first arch (1a) and the second arch (1b), and the main smoke guide wall (3) of the lower part falls on the first arch (1a) and the second arch (1b).

4. The boiler with optimized rear arch structure strength according to claim 3, characterized in that: The arch (1a) is made of wear-resistant high-temperature castable material.

5. The boiler with optimized rear arch structure strength according to claim 1, characterized in that: A layer of heat insulating material is also provided on the top surface of the rear arch (1), and the front end of the heat insulating material extends to between the main smoke guide wall (3) and the rear arch (1).

6. The boiler with optimized rear arch structure strength according to claim 2, characterized in that: A smoke inlet (9) communicating with the combustion chamber and the heat exchange zone is provided on one side of the main smoke guide wall (3) and the inner wall of the furnace (2), and a plurality of mutually staggered smoke auxiliary guide walls (7) are provided at intervals on the top of the lower drum (5) for guiding the smoke to flow along a Z-shaped path in the heat exchange zone.

7. The boiler with optimized rear arch structure strength according to claim 2, characterized in that: The lower drum (5) is connected to the upper drum (10) via a heat exchange pipe (8).

8. The boiler with optimized rear arch structure strength according to claim 1, characterized in that: A crawler conveyor (6) for conveying fuel is provided at the bottom of the furnace (2).

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