Anti-abrasion device for hanging pipe of circulating fluidized bed boiler

Abstract

An anti-abrasion device for a hanging pipe of a circulating fluidized bed boiler is used for protecting the pipe wall of a steam hanging pipe in a boiler mixing chamber in the alcohol distillation process in the alcohol production industry, and relates to the technical field of design of the anti-abrasion device for the hanging pipe of the boiler. A hanging pipe anti-abrasion beam formed by pouring reinforced concrete is arranged on the anti-abrasion beam, and under blocking of the hanging pipe anti-abrasion beam, high-temperature and high-concentration coal flue gas entering a high-temperature superheater mixing chamber cannot directly scour the root of a steam hanging pipe. Under the blocking of the anti-abrasion beam of the hanging pipe, the flowing direction of high-temperature, high-pressure and high-concentration coal flue gas reaching 200,000 cubic meters per hour can be changed, the scouring force of the coal flue gas to the pipe wall during flowing is reduced, and meanwhile, the high temperature can still heat the steam in the steam hanging pipe, so that the anti-abrasion beam of the hanging pipe can be used for preventing the steam in the steam hanging pipe from being damaged. The steam hanging pipe has the advantages that the service life of the steam hanging pipe can be guaranteed, and the arranged anti-abrasion tiles can protect the pipe wall of the hanging pipe from being abraded.

Description

Technical Field

[0001] A wear-resistant device for the hanging pipes of a circulating fluidized bed boiler is used to protect the walls of the steam hanging pipes in the mixing chamber of the boiler during the alcohol distillation process in the alcohol production industry. This relates to the design and technical field of a boiler hanging pipe wear-resistant device. Background Technology

[0002] With the continuous improvement of production technology and product quality in the alcohol industry, alcohol distillation and DDGS feed workshops have put forward higher requirements for the stability of boiler steam supply pressure and temperature. Among them, the steam hanger pipe of the boiler operating components is a pressure-bearing component. However, the wear of this pressure-bearing component has always affected the safe and stable operation of enterprises with boiler equipment in China. Once the steam hanger pipe is worn, leading to leakage problems, it will directly affect the stability of boiler unit operation.

[0003] Utility model patent CN201621313938.X discloses a boiler hanger pipe anti-wear device. This utility model includes a hanger pipe with a wedge-shaped anti-wear protective tile at its front end. A clamping nail is installed between two adjacent hanger pipes, and the tail of the clamping nail is welded and fastened to the wedge-shaped anti-wear protective tile. A plastic layer is provided on the side of the hanger pipe connected to the clamping nail. This utility model has a simple and reasonable structure, effectively fixing the wedge-shaped anti-wear protective tile and preventing it from falling off or deforming, achieving the goal of maintenance-free long-term use of the hanger pipe. This technology uses wedge-shaped anti-wear protective tiles to protect the boiler hanger pipe.

[0004] my country is the world's largest producer and user of boilers. Boilers are important thermal power equipment. In order to stabilize the safe operation of boilers and continuously improve the safety rate of boiler operation, there are many anti-wear measures for various parts of boilers in China, such as the anti-wear technology of hanging pipes in circulating fluidized bed boilers. The traditional process is to install anti-wear tiles on hanging pipes, which mainly include anti-wear tiles, supersonic electric arc spraying, and anti-wear grating.

[0005] In practice, the current protective measures have the effect of extending the safe operating cycle of the boiler's pressure-bearing components, but they cannot fundamentally solve the problem of wear, especially the severe wear at the contact point between the steam hanging pipe and the top surface of the boiler mixing chamber, where the current anti-wear technology is basically ineffective. Utility Model Content

[0006] The purpose of this utility model is to address the shortcomings of the existing technology by designing a technical solution to the scouring problem of boiler hanging pipes by changing the scouring direction at the contact position between the boiler hanging pipe and the top surface of the boiler mixing chamber.

[0007] This utility model consists of a wear-resistant structure for the hanging pipes of a circulating fluidized bed boiler, including a protective sleeve and a wear-resistant beam for the hanging pipes.

[0008] The sheath tube includes a sheath and a sleeve: the sheath is sleeved on the outer wall of the steam hanging pipe, with a 30mm interval between two sheaths, and a sleeve is sleeved at the connection of the two sheaths, with the inner diameter of the sleeve being larger than the outer diameter of the sheath.

[0009] The pipe sheath will expand and contract under high temperature. In order to prevent the pipe sheath from breaking during expansion, each pipe sheath is designed to be 1 meter long and will be placed on the outer wall of all the steam hanging pipes in sequence. A protective sleeve is installed at the joint of the pipe sheath to prevent the gap at the joint from being washed away.

[0010] The suspended pipe anti-wear beam is made of reinforced concrete. The suspended pipe anti-wear beam is rectangular with a cross-sectional width of 100-200mm and a thickness of 200-300mm.

[0011] The anti-wear beam for the hanging pipe is installed on the top surface of the high-temperature superheated mixing chamber of the boiler. The length of the anti-wear beam for the hanging pipe is the same as the length of the top surface of the high-temperature superheated mixing chamber. The anti-wear beam for the hanging pipe is assembled on the top surface of the high-temperature superheated mixing chamber. The upper end of the steam hanging pipe passes through the top surface of the high-temperature superheated mixing chamber and is connected to the upper hanging pipe header.

[0012] The suspension pipe anti-wear beam assembly on the top surface of the high-temperature superheated mixing chamber refers to a concrete pouring assembly, which can be a fixed assembly by metal fasteners, or it can be a separate pouring followed by bonding assembly with corundum silicon carbide plastic.

[0013] The contact surface between the anti-wear beam of the hanging pipe on the top surface of the high-temperature superheated mixing chamber and the top surface of the high-temperature superheated mixing chamber is filled with corundum silicon carbide plastic to form an arc-shaped sealing surface.

[0014] The two corners of the hanger pipe anti-wear beam that are away from contacting the top surface of the high-temperature overheated mixing chamber are arc-shaped.

[0015] The material of the pipe sheath and the sleeve is 16Cr25Ni20Si2.

[0016] The beneficial technical effects of this utility model are as follows:

[0017] 1. A cast-in-place anti-wear beam is installed on the top of the fluidized bed boiler hanging pipe facing the direction of the flue gas. This beam can directly face the scouring of high-temperature, high-concentration flue gas containing coal slag, which can reach up to 200,000 cubic meters per hour. The anti-wear beam blocks the strong scouring of the steam hanging pipe at the rear end of the steam hanging pipe, thus reducing wear.

[0018] 2. The arc-shaped sealing surface formed by the anti-wear beam of the hanging pipe and the top surface of the high-temperature superheated mixing chamber, as well as the two arc-shaped corners away from the top surface of the high-temperature superheated mixing chamber, can play a guiding role when subjected to the scouring of high-temperature, high-concentration, and high-flow-rate flue gas, effectively extending the blocking life of the anti-wear beam of the hanging pipe. According to calculations based on actual usage, before the installation of the anti-wear beam of the hanging pipe, the time for the hanging pipe to be punctured was as short as 3 months and as long as 6 months. Even if we calculate based on a lifespan of 6 months, the anti-wear beam of the hanging pipe designed now can extend the time for the hanging pipe to be worn and replaced to 7 years, which is more than 10 times that of the original.

[0019] 3. The newly designed anti-wear beam of the hanging pipe first blocks the impact of high-temperature gas from the flue. Under the obstruction of the anti-wear beam, the movement direction of the high-temperature, high-concentration flue gas containing coal slag is changed, so that the impact force directly impacting the hanging pipe becomes a downward flow in the same direction as the hanging pipe. Therefore, the impact force acting on the hanging pipe is greatly reduced. Moreover, the protective tiles and sleeves designed on the hanging pipe can also effectively block the scouring of flue gas moving in the same direction. Therefore, the service life of the hanging pipe can be extended by 10 times compared with the original.

[0020] 4. This utility model has the advantages of low investment, easy manufacturing, and easy observation and handling. While extending the service life, it can reduce investment. It can also reduce the labor intensity of workers by eliminating the need for frequent replacement of pipes. Furthermore, it can fundamentally solve the problem of erosion and wear at the root of the hanging pipe, thereby improving the safe operation cycle and safety efficiency of the boiler. Attached Figure Description

[0021] Figure 1. Schematic diagram of the installation position of the anti-wear beam of the hanging pipe of this utility model;

[0022] Figure 2 This utility model Figure 1 Enlarged structural schematic diagram of steam hanger pipe (Figure 6 in the Chinese Library Classification);

[0023] Figure 3 This utility model Figure 2 Enlarged diagram of circle A in the middle;

[0024] Figure 4 This utility model Figure 1 Enlarged structural diagram of Figure 4 in the Chinese Library Classification.

[0025] In the diagram: Boiler-1, Flue gas direction arrow-2, High-temperature superheated mixing chamber-3, Hanging pipe anti-wear beam-4, Hanging pipe header-5, Steam hanging pipe-6, High-temperature superheater-7, Low-temperature superheater-8, Flue gas duct-9, Pipe protector-10, Sheath-11, Arc-shaped sealing surface-12, Arc-shaped angle-13. Detailed Implementation

[0026] To clearly and completely describe the technical content of this utility model, the preferred embodiment of this utility model is given below in conjunction with the accompanying drawings:

[0027] Example 1: Explanation of the design principle of this utility model

[0028] In addition to the existing anti-wear measures for circulating fluidized bed boilers, metal anti-wear tiles are typically installed on the steam hanger tubes. However, due to factors such as metal thermal expansion and deformation, installation parameters, and material properties, these anti-wear tiles often experience problems like detachment and deformation after a short period of use. Moreover, these anti-wear tiles can only mitigate the erosion and wear of the hanger tube body. This is because when flue gas enters the high-temperature superheater mixing chamber, it impacts the steam hanger tubes laterally. Furthermore, the flue gas at this time contains a high concentration of coal slag and has the highest temperature. This flue gas with a high concentration of coal slag further impacts the steam hanger tubes during mixing in the high-temperature superheater. The direct impact at the root of the boiler ceiling is the greatest, creating a cutting effect on the root of the suspended pipe. Therefore, the actual service life of existing steam suspended pipes is at least 3 months and at most 6 months before needing replacement or repair due to damage. After the initial lateral impact of flue gas on the steam suspended pipe, the gas, obstructed by space, changes direction and flows downwards, creating longitudinal friction on the pipe body. Therefore, existing metal abrasion-resistant tiles only provide some protection for the longitudinal steam suspended pipe and do not actually solve the problem of friction on the steam suspended pipe during boiler operation. The erosion and wear at the root of the steam hanger pipe, especially on the windward side, fails to provide protection. To address this technical issue and extend the service life of the steam hanger pipe root, an anti-wear beam made of heat-resistant steel bars and corundum silicon carbide cast plastic is installed at the front end of the steam hanger pipe on the windward side of the top of the high-temperature superheater mixing chamber. This causes the high-concentration flue gas, after being discharged from the separator's central cylinder, to be directly impacted by the flue gas under the influence of gravity and inertia, before it directly erodes the root of the steam hanger pipe along the ceiling of the high-temperature superheater mixing chamber. This anti-wear beam, with its rounded angle, is installed before it can directly erode the root of the steam hanger pipe. The anti-wear beams on the hanging pipes prevent the high-temperature, high-concentration flue gas entering the mixing chamber of the high-temperature superheater from directly scouring the root of the steam hanging pipes. The anti-wear beams also change the flow direction of the high-temperature, high-pressure flue gas, which reaches 200,000 cubic meters per hour, causing it to move downwards. Under these conditions, the high temperature of the flue gas can still heat the steam in the steam hanging pipes, but the impact force of the flow will no longer directly impact the steam hanging pipes, thus ensuring the service life of the steam hanging pipes.

[0029] Example 2: Structural Installation of this Utility Model

[0030] During production, the steam hanger pipes, installed within the inlet header, pass through the inlet header and descend into the boiler's high-temperature superheater mixing chamber. Inside the high-temperature superheater mixing chamber, a large flow of 200,000 cubic meters of high-temperature (900°C) flue gas rushes in per hour. The purpose of this high-temperature flue gas is to heat the steam hanger pipes passing through the high-temperature superheater mixing chamber, maintaining their temperature. When these high-temperature steam hanger pipes, carrying high-temperature steam, enter the lower low-temperature superheater, they can maintain the required temperature for the lower low-temperature heater. To ensure heat preservation and prevent impact, this invention incorporates a design before the steam hanger pipes... The end is equipped with a wear-resistant beam for the hanging pipe. Protective tiles and sleeves are installed on the steam hanging pipe. The protective tiles are fitted onto the outer wall of the steam hanging pipe, and a sleeve is fitted at the connection between two protective tiles. For ease of installation, the sleeves are tightly fitted onto the outer diameter of the protective tiles. The protective tiles will expand and contract at high temperatures. To prevent the protective tiles from bursting during expansion, each protective tile is designed to be one meter long, with a 30mm gap between each tile. The entire outer wall of the steam hanging pipe is sequentially fitted. A sleeve is installed at the connection of the protective tiles to prevent erosion at the joint. The material of the protective tiles 11 and sleeves 10 is 16Cr25Ni20Si2.

[0031] The anti-wear beam of the hanging pipe is made of heat-resistant steel bars and corundum silicon carbide plastic. The anti-wear beam of the hanging pipe is a rectangular body with a cross-sectional width of 100-200mm and a thickness of 200-300mm.

[0032] The anti-wear beam for the hanging pipe is installed on the top surface of the mixing chamber of the high-temperature superheater of the boiler. The length of the anti-wear beam for the hanging pipe is the same as the length of the top surface of the mixing chamber 3 of the high-temperature superheater. The anti-wear beam for the hanging pipe 4 is assembled on the top surface of the mixing chamber of the high-temperature superheater. The upper end of the steam hanging pipe passes through the top surface of the mixing chamber of the high-temperature superheater and is connected to the upper hanging pipe header.

[0033] The hanger pipe anti-wear beam assembly on the top surface of the mixing chamber of the high-temperature superheater refers to a heat-resistant steel bar and corundum silicon carbide plastic casting assembly, which can be a heat-resistant metal fastener assembly or a corundum silicon carbide plastic adhesive assembly.

[0034] The contact surface between the anti-wear beam of the hanging pipe on the top surface of the high-temperature superheater mixing chamber and the top surface of the high-temperature superheater mixing chamber is filled with corundum silicon carbide plastic to form an arc-shaped sealing surface.

[0035] The two corners of the anti-wear beam of the hanging pipe that are away from the contact with the top surface of the mixing chamber of the high-temperature superheater are rounded corners.

[0036] The above-mentioned setup is mainly designed to address the issue that when the 200,000 cubic meter high-flow-rate (900 degrees Celsius) flue gas passes through the high-temperature superheater mixing chamber, the large flow rate and the presence of a large amount of high-temperature coal dust in the gas flow will directly scour the roots of the steam hanger pipes in the high-temperature superheater mixing chamber when these high-temperature coal dust reach the top of the boiler mixing chamber. Under the impact of high temperature, large flow rate, and high-temperature coal dust on the roots of the steam hanger pipes in the high-temperature superheater mixing chamber, the outer walls of these steam hanger pipes are easily punctured, especially on the side of the steam hanger pipe roots facing the oncoming wind, which is very easy to form a cutting effect. Once punctured, steam leakage will occur.

[0037] To address the problem that existing high-temperature steam hanger pipes are easily punctured by high-pressure airflow, an anti-wear beam is installed on the top surface of the high-temperature superheater mixing chamber on the windward side of the steam hanger pipe. This beam blocks the impacting airflow on the steam hanger pipe, especially at its root, thereby extending its service life. The length of the anti-wear beam is the same as the length of the top surface of the high-temperature superheater mixing chamber.

[0038] Furthermore, when installing anti-wear protective tiles for steam hanger pipes, in order to prevent the anti-wear protective tiles from falling off due to material deformation at high temperatures, it is necessary to set a necessary expansion gap during installation. At the same time, it is also necessary to ensure that the installed anti-wear protective tiles will not slip off due to excessive gaps. The calculation of the size of the expansion gap between the steam hanger pipe body and the temperature, as well as the relationship between the anti-wear protective tile material and the temperature, is a technical content well known to those skilled in the art. Moreover, it also requires matching design according to the actual situation. Therefore, it will not be elaborated here.

[0039] Furthermore, since the boilers in use are of different models, the resulting temperatures also vary. The heat-resistant steel bars and corundum silicon carbide plastics are materials well-known to those skilled in the art. Therefore, those skilled in the art can choose the appropriate model based on the required temperature. The specific models of the heat-resistant steel bars and corundum silicon carbide plastics used will not be described in detail here.

Claims

1. A wear-resistant device for hanging pipes of a circulating fluidized bed boiler, comprising a sheathing pipe and a wear-resistant beam for the hanging pipe (4), characterized in that: The sheath tube includes a sheath (11) and a sheath (10); the sheath (11) is fitted on the outer wall of the steam hanging pipe (6), and the sheath (10) is fitted at the connection of the two sheaths (11). The anti-wear beam (4) of the hanging pipe is set on the top surface of the high temperature superheated mixing chamber (3) of the boiler. The length of the anti-wear beam (4) of the hanging pipe is the same as the length of the top surface of the high temperature superheated mixing chamber (3). The anti-wear beam (4) of the hanging pipe is assembled on the top surface of the high temperature superheated mixing chamber (3). The upper end of the steam hanging pipe (6) passes through the top surface of the high temperature superheated mixing chamber (3) and is connected to the upper hanging pipe header (5).

2. The anti-wear device for hanging pipes of a circulating fluidized bed boiler according to claim 1, characterized in that: The inner diameter of the sleeve (10) is larger than the outer diameter of the protective pipe (11).

3. The anti-wear device for hanging pipes of a circulating fluidized bed boiler according to claim 1, characterized in that: Each of the protective pipe tiles (11) is 1 meter long and is installed to cover the outer wall of all the steam hanging pipes (6) in sequence. The two protective pipe tiles (11) are installed at a 30mm interval, and a protective sleeve (10) is set at the connection of the protective pipe tiles (11).

4. The anti-wear device for hanging pipes of a circulating fluidized bed boiler according to claim 1, characterized in that: The anti-wear beam (4) of the hanging pipe is formed by a mixture of heat-resistant steel bars and corundum silicon carbide plastic. The anti-wear beam (4) of the hanging pipe is a rectangular body with a cross-sectional width of 100-200mm and a thickness of 200-300mm.

5. The anti-wear device for hanging pipes of a circulating fluidized bed boiler according to claim 1, characterized in that: The hanger pipe anti-wear beam (4) assembly on the top surface of the high temperature overheated mixing chamber (3) refers to the heat-resistant steel bar, corundum silicon carbide plastic casting assembly, the assembly fixed by heat-resistant metal fasteners, and the assembly bonded by corundum silicon carbide plastic mixture.

6. The anti-wear device for hanging pipes of a circulating fluidized bed boiler according to claim 1, characterized in that: The contact surface between the hanger pipe anti-wear beam (4) on the top surface of the high temperature superheated mixing chamber (3) and the top surface of the high temperature superheated mixing chamber (3) is filled with corundum silicon carbide plastic to form an arc-shaped sealing surface (12).

7. The anti-wear device for hanging pipes of a circulating fluidized bed boiler according to claim 1, characterized in that: The two corners of the anti-wear beam (4) of the hanging pipe that are far from the top surface of the high-temperature overheated mixing chamber (3) are arc-shaped corners (13).

8. The anti-wear device for hanging pipes of a circulating fluidized bed boiler according to claim 1, characterized in that: The materials of the protective pipe tile (11) and the sheath (10) are 16Cr25Ni20Si2.

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