A power plant boiler air feeding mixing pipe

Abstract

The utility model discloses a power plant boiler air supply mixing pipe relates to power plant technical field, including tee bend, the front end fixedly connected with mixed air supply pipe of tee bend, the inner surface rear side fixed mounting of mixed air supply pipe has the screen, the surface middle part rotationally connected with the axle rod of screen, the rear end fixed mounting of axle rod has the turbofan, the inner surface middle part fixed mounting of mixed air supply pipe has the spiral plate, the inner surface front end fixed mounting of mixed air supply pipe has the wind -resisting cover, and the wind -resisting cover is set as the horn shape of rear narrow front wide. Compared with the existing ordinary power plant boiler air supply pipe, the power plant boiler air supply mixing pipe ensures that the content of gas is consistent in all aspects, makes the quality of boiler air supply more uniform, the combustion effect of all aspects is unified, avoids appearing mixed gas mixing not fully, causes the new air and flue gas to cause the oxygen supply of different quality in the boiler to combustion material, makes the combustion effect of boiler internal combustion material uneven.

Description

Technical Field

[0001] This utility model relates to the field of power plant technology, specifically to a boiler air mixing pipe for power plants. Background Technology

[0002] When a power plant boiler is burning, air needs to be supplied through pipes to ensure that oxygen and combustion aids are continuously replenished into the boiler to ensure normal combustion.

[0003] However, existing power plant boiler air mixing pipes can utilize multiple pipes to supplement the air supply by drawing on the exhaust gas from the boiler, expanding the air distribution source and making full use of the exhaust gas. However, when the fresh air pipe and the flue gas pipe are mixed, they are only combined. The fresh air and flue gas have different qualities and oxygen contents. Even if they flow together in a single pipe, it is difficult to ensure effective mixing of the two gases. Ultimately, the gas is directly discharged into the boiler, resulting in the stratification of gas composition inside the boiler and uneven oxygen content in different parts of the gas. This leads to differences in combustion efficiency of the combustibles in different parts of the boiler, making it difficult to ensure balanced combustion in the boiler.

[0004] Therefore, in view of this, we studied and improved the existing structure to address its shortcomings and proposed a power plant boiler air mixing pipe. Utility Model Content

[0005] The purpose of this utility model is to provide a boiler air mixing pipe for power plants to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a boiler air mixing pipe for a power plant, comprising a three-way pipe, a mixing air supply pipe fixedly connected to the front end of the three-way pipe, a filter screen fixedly installed on the rear side of the inner surface of the mixing air supply pipe, a shaft rotatably connected to the middle of the surface of the filter screen, a turbofan fixedly installed at the rear end of the shaft, a spiral plate fixedly installed on the middle of the inner surface of the mixing air supply pipe, and a wind baffle fixedly installed at the front end of the inner surface of the mixing air supply pipe, wherein the wind baffle is configured as a trumpet shape that is narrower at the rear and wider at the front.

[0007] Preferably, a fresh air duct is fixedly connected to the left rear end of the three-way pipe, and a flue gas duct is fixedly connected to the right rear end of the three-way pipe.

[0008] Preferably, a fresh air inlet valve is installed at the left rear end of the surface of the three-way pipe, and a flue gas inlet valve is installed at the rear end of the surface of the three-way pipe.

[0009] Preferably, the fresh air inlet valve controls the connection between the three-way pipe and the fresh air duct, and the flue gas inlet valve controls the connection between the three-way pipe and the flue gas duct.

[0010] Preferably, a mixing air inlet valve is installed on the front side of the three-way pipe, and the mixing air inlet valve controls the connection between the three-way pipe and the mixing air supply pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model, through the setting of a three-way pipe, a fresh air pipe, a flue gas pipe, and a mixing air supply pipe, allows the fresh air pipe to introduce fresh air, while the flue gas pipe can utilize boiler exhaust gas, thereby increasing the air supply source. Furthermore, the boiler exhaust gas has high-temperature waste heat, which can fully contact and mix with the fresh air inside the three-way pipe and the mixing air supply pipe, thereby preheating the fresh air, increasing the air temperature at the air preheater inlet, reducing the energy consumption of the air preheater itself to heat the fresh air, and fully utilizing the waste heat of the flue gas, thereby improving the overall thermal efficiency of the pipeline, reducing heat energy waste, and reducing unnecessary energy consumption output.

[0013] 2. This utility model, through the arrangement of a filter screen, shaft, turbine fan, spiral plate, and wind baffle, allows high-temperature flue gas and fresh air to enter the mixing air supply pipe together through a three-way pipe. The airflow drives the turbine fan to rotate, and the continuous rotation of the turbine fan disrupts the subsequent fresh air and flue gas, ensuring thorough mixing. Furthermore, the mixed gas, blocked by the spiral plate, forms a spiral airflow that flows forward, increasing its velocity. Upon encountering the wind baffle, the high-speed mixed gas collides with the rear side wall of the wind baffle, forming a vortex-like backflow at the angle between the wind baffle and the pipe wall, continuously rotating, thus further ensuring thorough mixing. The fully mixed gas is then discharged into the boiler, ensuring consistent gas content and thus more uniform air supply quality to the boiler. This maintains consistent combustion performance and avoids insufficient mixing, which could lead to uneven oxygen supply to the combustibles by the fresh air and flue gas, resulting in uneven combustion within the boiler. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0015] Figure 2 This is a cross-sectional view of the hybrid air supply duct of this utility model.

[0016] In the diagram: 1. Tee; 2. Fresh air inlet valve; 3. Flue gas inlet valve; 4. Mixed air inlet valve; 5. Fresh air duct; 6. Flue gas duct; 7. Mixed air supply duct; 8. Filter element; 9. Filter screen; 10. Shaft; 11. Scraper; 12. Turbine fan. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figures 1-2 As shown, a power plant boiler air mixing pipe includes a three-way pipe 1. A mixing air supply pipe 7 is fixedly connected to the front end of the three-way pipe 1. A filter screen 8 is fixedly installed on the rear side of the inner surface of the mixing air supply pipe 7. A shaft 9 is rotatably connected to the middle of the surface of the filter screen 8. A turbo fan 10 is fixedly installed at the rear end of the shaft 9. A spiral plate 11 is fixedly installed on the middle of the inner surface of the mixing air supply pipe 7. A wind baffle 12 is fixedly installed on the front end of the inner surface of the mixing air supply pipe 7, and the wind baffle 12 is configured as a trumpet shape that is narrow at the back and wide at the front.

[0019] By adopting the above technical solution, after the high-temperature flue gas and fresh air enter the mixing air supply pipe 7 through the three-way pipe 1, the air flow will drive the turbo fan 10 to rotate. The turbo fan 10 rotates continuously, which will disturb the subsequent fresh air and flue gas, so that the fresh air and flue gas can be fully mixed.

[0020] The mixed gas will form a spiral airflow that flows forward under the obstruction of the spiral plate 11. The spiral airflow increases the flow velocity. After hitting the wind baffle 12, the rear side wall of the wind baffle will cause the high-speed mixed gas to form a vortex backflow at the angle between the wind baffle 12 and the pipe wall, and rotate continuously, so that the mixed gas can be further fully mixed. The fully mixed gas is then discharged into the boiler to ensure that the content of the gas is consistent in all aspects.

[0021] Furthermore, a fresh air duct 5 is fixedly connected to the left rear end of the tee pipe 1, and a flue gas duct 6 is fixedly connected to the right rear end of the tee pipe 1.

[0022] By adopting the above technical solution, the fresh air duct 5 can introduce fresh air, while the flue gas duct 6 can draw on the boiler exhaust gas.

[0023] The boiler exhaust gas has high-temperature waste heat, which can fully contact and mix with the fresh air inside the three-way pipe 1 and the mixing air supply pipe 7, thereby preheating the fresh air, increasing the air temperature at the air preheater inlet, and reducing the energy consumption of the air preheater itself to heat the fresh air.

[0024] Furthermore, a fresh air inlet valve 2 is installed at the left rear end of the surface of the three-way pipe 1, and a flue gas inlet valve 3 is installed at the rear end of the surface of the three-way pipe 1.

[0025] Fresh air inlet valve 2 controls the connection between the three-way pipe 1 and the fresh air pipe 5, and flue gas inlet valve 3 controls the connection between the three-way pipe 1 and the flue gas pipe 6.

[0026] By adopting the above technical solution, different valves can be opened according to usage requirements. When a single pipe is used for air intake, closing another valve can prevent gas from overflowing through another pipe.

[0027] Furthermore, a mixing air inlet valve 4 is installed on the front side of the surface of the three-way pipe 1, and the mixing air inlet valve 4 controls the connection between the three-way pipe 1 and the mixing air supply pipe 7.

[0028] By adopting the above technical solution, the fresh air inlet valve 2 and the flue gas inlet valve 3 can control the opening and closing states of the fresh air pipe 5 and the flue gas pipe 6 respectively. That is, when only one pipe is used for gas supply, the other pipe can be closed, thereby preventing gas from flowing out through the other pipe.

[0029] Working Principle: When using the boiler feed air mixing pipe of this power plant, firstly, open the fresh air inlet valve 2, flue gas inlet valve 3, and mixing gas inlet valve 4 to connect all pipe sections. Fresh air can be introduced into the fresh air pipe 5, while the flue gas pipe 6 can draw on the boiler exhaust gas, thereby increasing the air supply. After the high-temperature flue gas and fresh air enter the mixing air supply pipe 7 through the three-way pipe 1, the air flow will drive the turbofan 10 to rotate. The continuous rotation of the turbofan 10 will disturb the subsequent fresh air and flue gas, allowing the fresh air and flue gas to mix fully. The mixed gas will form a spiral airflow that flows forward under the obstruction of the spiral plate 11. The spiral airflow increases the flow velocity. After encountering the wind baffle 12, the wind baffle... The rear sidewall causes the high-speed mixed gas to form a vortex backflow at the angle between the wind baffle 12 and the pipe wall, which rotates continuously, thereby allowing the mixed gas to be further and more fully mixed. The fully mixed gas is then discharged into the boiler to ensure that the content of all aspects of the gas is consistent, thus making the quality of the boiler air supply more uniform and maintaining the same combustion effect in all aspects. The gas flows towards the mixing air supply pipe 7, at which time the boiler exhaust gas will come into contact with the fresh air. The exhaust gas has high temperature waste heat, which can fully contact and mix with the fresh air inside the three-way pipe 1 and the mixing air supply pipe 7, thereby preheating the fresh air and increasing the air temperature at the air preheater inlet. This is the working principle of the boiler air supply mixing pipe of this power plant.

Claims

1. A boiler feed air mixing pipe for a power plant, comprising a tee pipe (1), characterized in that, The front end of the three-way pipe (1) is fixedly connected to a mixing air supply pipe (7). A filter screen (8) is fixedly installed on the rear side of the inner surface of the mixing air supply pipe (7). A shaft (9) is rotatably connected to the middle of the surface of the filter screen (8). A turbo fan (10) is fixedly installed at the rear end of the shaft (9). A spiral plate (11) is fixedly installed on the middle of the inner surface of the mixing air supply pipe (7). A wind baffle (12) is fixedly installed on the front end of the inner surface of the mixing air supply pipe (7). The wind baffle (12) is set as a horn shape that is narrow at the back and wide at the front.

2. The power plant boiler air mixing pipe according to claim 1, characterized in that, The left rear end of the three-way pipe (1) is fixedly connected to a fresh air pipe (5), and the right rear end of the three-way pipe (1) is fixedly connected to a flue gas pipe (6).

3. The power plant boiler air mixing pipe according to claim 1, characterized in that, A fresh air inlet valve (2) is installed on the left rear end of the surface of the three-way pipe (1), and a flue gas inlet valve (3) is installed on the rear end of the surface of the three-way pipe (1).

4. A power plant boiler air mixing pipe according to claim 3, characterized in that, The fresh air inlet valve (2) controls the connection between the three-way pipe (1) and the fresh air pipe (5), and the flue gas inlet valve (3) controls the connection between the three-way pipe (1) and the flue gas pipe (6).

5. A power plant boiler air mixing pipe according to claim 1, characterized in that, A mixing air inlet valve (4) is installed on the front side of the surface of the three-way pipe (1), and the mixing air inlet valve (4) controls the connection between the three-way pipe (1) and the mixing air supply pipe (7).

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