Abrasion-proof device for waste heat power generation kiln head pipeline

Abstract

The utility model belongs to the technical field of flue gas waste heat utilization, and particularly relates to a waste heat power generation kiln head pipeline anti-abrasion device which comprises a flow equalizing anti-abrasion mechanism, the flow equalizing anti-abrasion mechanism comprises a first flow guide cover and a second flow guide cover set, and the first flow guide cover and the second flow guide cover set are sequentially arranged from top to bottom. The second flow guide cover group comprises two second flow guide covers which are arranged side by side left and right, the sections of the first flow guide covers and the second flow guide covers are trapezoidal, the first flow guide covers and the second flow guide covers are of barrel structures with the upper opening area smaller than the lower opening area, and the tops of the two second flow guide covers are arranged in the lower opening of the first flow guide cover in a penetrating mode. The device can effectively increase the uniformity of a flue gas velocity field at the inlet of the flue transition section, and can eliminate a vortex region, reduce the scouring of airflow and reduce the abrasion of the pipeline, thereby prolonging the service life of the pipeline, improving the heat exchange efficiency of the waste heat boiler and ensuring the economical efficiency and stability of heat exchange.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas waste heat utilization technology, specifically relating to a wear-resistant device for a waste heat power generation kiln head pipeline. Background Technology

[0002] With the development of the cement industry, energy-saving technologies in the cement industry have advanced rapidly. During cement production, a large amount of low-grade waste heat is recovered, converting the heat energy in the exhaust gas into electricity or combined heat and power (CHP), effectively reducing dust pollution and energy consumption in the cement production environment.

[0003] Currently, vertical AQC waste heat boilers are the most common type used in cement kilns. The working process is as follows: the exhaust gas extracted from the grate cooler is lifted through a connecting flue to the top flue chamber of the waste heat boiler and enters the furnace. From top to bottom, it sequentially washes the steam superheater, the evaporator heating surface, and the water heating section heating surface. The low-temperature exhaust gas after heat exchange is drawn out from the bottom of the waste heat boiler, then lifted through a flue to the inlet of the kiln head electrostatic precipitator. After purification, it is sent to the chimney by a fan and discharged into the atmosphere. The exhaust gas extracted from the kiln head grate cooler has a temperature of 350℃-400℃ and carries hard clinker fragments and dust. When it enters from the top of the furnace, it is sprayed at high speed directly onto the upper heating surface, causing wear on the heating surface tube bundles. The main reason is that the flue gas ducts of AQC waste heat boilers and other equipment are usually circular, while the heat exchange section of the convective heating surface is a square channel. A sudden expansion section is formed at the flue gas inlet section of the heat exchange surface. When the flue gas flows through the sudden expansion section, strong turbulent mixing occurs, and the boundary layer begins to separate from the flue gas inlet, generating a strong vortex zone. This causes non-uniformity of the flue gas velocity field, resulting in the most severe wear at this location. At the same time, considering that the straight pipe section of the boiler inlet is relatively short, there is a certain jet deflection when the dust-laden exhaust gas enters the boiler, which will further aggravate the scouring and wear of the heating surface tube bundle, inevitably affecting the economy and stability of heat exchange.

[0004] In existing technologies, the most direct way to improve the flue gas flow conditions at the boiler flue inlet is to lengthen the flue's flow stabilization section, allowing the flue gas to fully develop and stabilize by the time it reaches the heat exchange surface. However, this increases the length of the flue, thereby increasing overall manufacturing costs. Furthermore, the increased length of the flue also leads to greater heat loss from the boiler, affecting boiler efficiency.

[0005] Therefore, there is an urgent need for a wear-resistant device for the kiln head pipeline in waste heat power generation to solve the above problems. Utility Model Content

[0006] To address the aforementioned deficiencies in the existing technology, this utility model provides a wear-resistant device for waste heat power generation kiln head pipes, including a flow equalization and wear-resistant mechanism. The flow equalization and wear-resistant mechanism includes a first guide hood and a second guide hood group, which are arranged sequentially from top to bottom. The second guide hood group includes two second guide hoods arranged side by side. The cross-sections of both the first and second guide hoods are trapezoidal, and both the first and second guide hoods are cylindrical structures with an upper opening area smaller than the lower opening area, similar to a trumpet-shaped structure that is smaller at the top and larger at the bottom. The tops of the two second guide hoods are inserted into the lower opening of the first guide hood.

[0007] Optionally, the upper and lower openings of the first and second fairings are both rectangular.

[0008] Optionally, a first fixing strip is fixedly connected to both the left and right sides of the first fairing.

[0009] Optionally, a second fixing strip is fixedly connected between the outer wall of each of the two second deflectors and the inner wall of the first deflector.

[0010] Optionally, several anti-wear tubes are fixedly installed at the lower openings of both second air deflectors, and the several anti-wear tubes are arranged parallel to each other and spaced apart.

[0011] Optionally, the flow equalization and anti-wear mechanism is set at the inlet of the transition section of the flue at the kiln head, and one end of the first fixing strip of the first guide shroud is fixed to the inner wall of the inlet of the transition section of the flue.

[0012] This utility model also includes other components that enable the normal use of a wear-resistant device for a waste heat power generation kiln head pipeline, all of which are conventional technical means in the field. Furthermore, any devices or components not specified in this utility model employ conventional technical means in the field.

[0013] The working principle and beneficial effects of this utility model are as follows: by setting a flow equalization and anti-wear mechanism in the flue of the cement kiln head, and utilizing the longitudinal connection structure composed of the first guide hood and two second guide hoods, the uniformity of the inlet flue gas velocity field in the transition section of the flue can be effectively increased. At the same time, an anti-wear pipe is set at the lower opening of the second guide hood, which can eliminate the vortex area, further improve the uniformity of the inlet flue gas velocity field in the transition section of the flue, reduce the scouring of the airflow, reduce the wear on the pipe, thereby increasing the service life of the pipe, improving the heat exchange efficiency of the waste heat boiler, and ensuring the economy and stability of heat exchange. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the flow equalization and anti-wear mechanism of this utility model installed in the flue.

[0017] In the diagram: 1. Flue, 2. Transition section, 3. First guide shroud, 4. Second guide shroud, 5. First fixing strip, 6. Second fixing strip, 7. Anti-wear pipe. Detailed Implementation

[0018] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0019] Example

[0020] like Figure 1-2 As shown, this utility model embodiment provides a wear-resistant device for a waste heat power generation kiln head pipeline, including a flow equalization wear-resistant mechanism. The flow equalization wear-resistant mechanism is installed at the inlet of the transition section 2 of the flue 1 at the kiln head. The flow equalization wear-resistant mechanism includes a first guide hood 3 and a second guide hood group, which are arranged sequentially from top to bottom. The left and right sides of the first guide hood 3 are fixedly connected with first fixing strips 5, and one end of the first fixing strip 5 is fixed to the inner wall of the inlet of the transition section 2 of the flue 1. The second guide hood group includes two second guide hoods 4 arranged side by side. The cross-section of the cover 4 is trapezoidal, and the first guide cover 3 and the second guide cover 4 are both cylindrical structures with an upper opening area smaller than the lower opening area, which is similar to a trumpet-shaped structure with a smaller upper opening and a larger lower opening. The upper opening and lower opening of the first guide cover 3 and the second guide cover 4 are both rectangular. The top of the two second guide covers 4 are inserted into the lower opening of the first guide cover 3. The outer wall of the two second guide covers 4 is fixedly connected to the inner wall of the first guide cover 3 with a second fixing strip 6. Several anti-wear tubes 7 are fixedly installed at the lower opening of the two second guide covers 4, and the several anti-wear tubes 7 are arranged parallel to each other and spaced apart.

[0021] The working principle and beneficial effects of this utility model are as follows: by setting a flow equalization and anti-wear mechanism in the flue 1 at the kiln head of the cement kiln, and utilizing the longitudinal connection structure composed of the first guide hood 3 and two second guide hoods, the uniformity of the flue gas velocity field at the inlet of the transition section 2 of the flue 1 can be effectively increased. At the same time, an anti-wear pipe 7 is set at the lower opening of the second guide hood 4, which can eliminate the vortex area, further improve the uniformity of the flue gas velocity field at the inlet of the transition section 2 of the flue 1, reduce the scouring of the airflow, reduce the wear on the pipe, thereby increasing the service life of the pipe, improving the heat exchange efficiency of the waste heat boiler, and ensuring the economy and stability of heat exchange.

[0022] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A wear-resistant device for a waste heat power generation kiln head pipeline, comprising a flow equalization and wear-resistant mechanism, characterized in that: The flow equalization and anti-wear mechanism includes a first guide shroud and a second guide shroud assembly, which are arranged sequentially from top to bottom. The second guide shroud assembly includes two second guide shrouds arranged side by side. The cross-sections of the first and second guide shrouds are both trapezoidal, and both the first and second guide shrouds are cylindrical structures with an upper opening area smaller than the lower opening area. The tops of the two second guide shrouds are inserted into the lower opening of the first guide shroud.

2. The wear-resistant device for waste heat power generation kiln head pipes according to claim 1, characterized in that: The upper and lower openings of both the first and second fairings are rectangular.

3. The wear-resistant device for the waste heat power generation kiln head pipeline according to claim 2, characterized in that: The first guide shield is fixedly connected to the first fixing strip on both the left and right sides.

4. The wear-resistant device for waste heat power generation kiln head pipes according to claim 3, characterized in that: The outer walls of the two second air deflectors are fixedly connected to the inner wall of the first air deflector by second fixing strips.

5. The wear-resistant device for the waste heat power generation kiln head pipeline according to claim 4, characterized in that: Several anti-wear tubes are fixedly installed at the lower openings of both second air deflectors, and these anti-wear tubes are arranged parallel to each other and spaced apart.

6. The wear-resistant device for waste heat power generation kiln head pipes according to claim 5, characterized in that: The flow equalization and anti-wear mechanism is set at the inlet of the transition section of the flue at the kiln head, and one end of the first fixing strip of the first guide hood is fixed to the inner wall of the inlet of the transition section of the flue.

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