Air pre-heater heating system

Abstract

The utility model relates to the technical field of electric power environmental protection, in particular to an air pre-heater heating system which comprises an air pre-heater, an air cooling island and a ventilation pipe, and one end of the ventilation pipe is arranged on one side of the air cooling island and can collect hot air generated by the air cooling island. The other end of the ventilation pipe communicates with a primary air channel and a secondary air channel of the air pre-heater and is used for outputting hot air into the primary air channel and the secondary air channel of the air pre-heater. The air pre-heater has the effect of reducing the conditions of corrosion and blockage of the air pre-heater.

Description

Technical Field

[0001] The present application relates to the field of electric power environmental protection technology, and in particular to an air preheater heating system. Background Art

[0002] The air preheater is a heat exchanger that uses the heat of the flue gas at the tail end of the boiler to heat the air required for fuel combustion to improve the thermal efficiency of the boiler. The air preheater has a flue, a primary air duct and a secondary air duct. High-temperature flue gas is introduced into the flue, primary air is introduced into the primary air duct, and secondary air is introduced into the secondary air duct. Both the primary air and the secondary air exchange heat with the high-temperature flue gas in the flue, thereby outputting hot air.

[0003] Both primary air and secondary air are ambient air drawn in from the outside environment by the fan. When the air preheater is installed in the area north of the Huaihe River, the outside ambient temperature of the engine in this area is below 5°C, and the temperatures of the primary air and secondary air are both below 5 degrees. The designed inlet air temperature of the primary air and secondary air of the air preheater is above 20°C, and the temperature of the primary air and secondary air is below 5°C, which causes the exhaust gas temperature at the air preheater outlet to be lower than the acid dew point and water dew point in winter, resulting in corrosion and blockage of the air preheater. Utility Model Content

[0004] The purpose of the present application is to provide an air preheater heating system, which can reduce the occurrence of corrosion and blockage in the air preheater.

[0005] The air preheater heating system provided in this application adopts the following technical solution:

[0006] An air preheater heating system comprises an air preheater, an air cooling island and a vent pipe, wherein one end of the vent pipe is arranged on one side of the air cooling island and can collect hot air produced by the air cooling island, and the other end of the vent pipe is connected to the primary air duct and the secondary air duct of the air preheater and is used to output the hot air to the primary air duct and the secondary air duct of the air preheater.

[0007] By adopting the above technical solution, the hot air generated by the air-cooling island flows into the first air inlet duct and the second air inlet duct, and then flows into the first air duct and the second air duct of the air preheater through the main air duct, thereby heating the primary air and the secondary air, ensuring the temperature of the primary air and the secondary air, and reducing the situation where the exhaust gas temperature at the air preheater outlet is lower than the acid dew point and the water dew point, thereby reducing the corrosion and blockage of the air preheater.

[0008] Optionally, there are a plurality of air-cooling islands, and the plurality of air-cooling islands are arranged side by side, and a ventilation pipe is provided between every two adjacent air-cooling islands;

[0009] The ventilation duct includes a first air inlet duct, a second air inlet duct and a main air duct, the main air duct is respectively connected with the first air duct and the second air duct of the air preheater, the first air inlet duct and the second air inlet duct are respectively arranged on both sides of the main air duct and are both connected with the main air duct, the first air inlet duct and the second air inlet duct are respectively arranged in a one-to-one correspondence with the positions of two adjacent air-cooling islands, and the air inlet on the first air inlet duct and the air inlet on the second air inlet duct are both arranged toward the corresponding air-cooling island.

[0010] By adopting the above technical solution and arranging the ventilation pipe between the two air-cooling islands, the hot air generated by the two air-cooling islands can flow into the main air duct through the first air inlet pipe or the second air inlet pipe, thereby increasing the air intake volume of the hot air.

[0011] Optionally, a plurality of the first air inlet pipes are provided, and the plurality of the first air inlet pipes are arranged along the length direction of the main air duct and are all connected to the main air duct.

[0012] By adopting the above technical solution, a plurality of first air inlet pipes are provided, thereby increasing the air inlets and further increasing the air intake volume of the hot air.

[0013] Optionally, a plurality of the second air inlet pipes are provided, and the plurality of the second air inlet pipes are arranged along the length direction of the main air duct and are all connected to the main air duct.

[0014] By adopting the above technical solution, a plurality of second air inlet pipes are provided, thereby increasing the air inlets and further increasing the air intake volume of the hot air.

[0015] Optionally, electric dampers are installed in both the first air inlet duct and the second air inlet duct, and the electric dampers are used to control the opening size of the air inlet ports of the air inlet ducts.

[0016] By adopting the above technical solution, the electric damper blocks the air inlets of the first air inlet duct and the second air inlet duct, and the size of the air inlet is controlled by controlling the opening size of the electric damper, thereby controlling the air intake volume of the first air duct and the second air duct.

[0017] Optionally, a wind shield is connected to the ventilation pipe, and the wind shield is extended in a direction close to the air-cooling island.

[0018] By adopting the above technical solution and providing a wind shield, the hot air is blocked, so that the hot air can enter the first air inlet pipe and the second air inlet pipe more easily.

[0019] Optionally, the wind shield is rotatably connected to the ventilation pipe.

[0020] By adopting the above technical solution, the wind shield is rotatably connected to the main air duct, and the wind shield effect of the wind shield can be adjusted by adjusting the angle between the wind shield and the main air duct, thereby adjusting the flow rate of hot air flowing into the first air inlet duct and the second air inlet duct, so that the air preheater heating system can adapt to different working conditions.

[0021] Optionally, there is a gap between one end of the wind shield away from the ventilation pipe and the air-cooling island.

[0022] By adopting the above technical solution, part of the hot air is guided into the air inlet duct to meet the air intake demand, and the other part of the hot air flows out through the gap between the two and dissipates into the atmosphere, ensuring a good heat exchange effect of the air-cooling island.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The hot air generated by the air cooling island flows into the first air inlet pipe and the second air inlet pipe, and then flows into the first air duct and the second air duct of the air preheater through the main air duct, thereby heating the primary air and the secondary air, ensuring the temperature of the primary air and the secondary air, and reducing the situation where the exhaust gas temperature at the air preheater outlet is lower than the acid dew point and the water dew point, thereby reducing the corrosion and blockage of the air preheater;

[0025] 2. By setting the ventilation pipe between the two air-cooling islands, the hot air generated by the two air-cooling islands can flow into the main air duct through the first air inlet pipe or the second air inlet pipe, thereby increasing the air intake volume of the hot air;

[0026] 3. By setting up a wind shield, the hot air is blocked, making it easier for the hot air to enter the first air inlet pipe and the second air inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an air preheater heating system according to an embodiment of the present application.

[0028] In the figure, 1, air cooling island; 11, condenser tube group; 12, cooling fan;

[0029] 2. Air preheater;

[0030] 3. Ventilation pipe; 31. First air inlet pipe; 32. Second air inlet pipe; 33. Main air duct;

[0031] 4. Windshield;

[0032] 5. Electric damper. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1 , further details of this application are given.

[0034] An air preheater heating system, referring to Figure 1 , including an air-cooling island 1, an air preheater 2 and a vent pipe 3. One end of the vent pipe 3 is arranged on one side of the air-cooling island 1 and can collect the hot air produced by the air-cooling island 1. The other end of the vent pipe 3 is connected to the primary air duct and the secondary air duct of the air preheater 2 and is used to output the hot air to the primary air duct and the secondary air duct of the air preheater 2.

[0035] The air-cooling island 1 includes a condensing tube group 11 and a cooling fan 12. Each air-cooling island 1 includes two condensing tube groups 11. The two condensing tube groups 11 are interconnected and form an inverted V shape. The area between the two condensing tube groups 11 is an installation space. The cooling fan 12 is arranged in the installation space and blows cold air upward. The cold air passes through the condensing tube group 11 and exchanges heat with the condensing tube group 11, so that the high-temperature steam in the condensing tube group 11 is condensed, and the cold air is converted into hot air and blown out of the installation space after heat exchange. In order to increase the cooling effect of the condensing tube group 11, a plurality of cooling fans 12 are arranged, and the plurality of cooling fans 12 are arranged in the installation space and blow cold air toward the condensing tube group 11.

[0036] The ventilation pipe 3 includes a first air inlet pipe 31, a second air inlet pipe 32 and a main air pipe 33. One end of the main air pipe 33 is closed, and the other end is respectively connected to the first air duct and the second air duct of the air preheater 2. The first air inlet pipe 31 and the second air inlet pipe 32 are respectively arranged on both sides of the main air pipe 33 and are symmetrically arranged with each other, and are both connected with the main air pipe 33. In other embodiments, the first air inlet pipe 31 and the second air inlet pipe 32 can also be staggered with each other.

[0037] In order to increase the ventilation efficiency of the main air duct 33, a plurality of first air inlet pipes 31 and second air inlet pipes 32 are provided, and a plurality of first air inlet pipes 31 are evenly spaced along the length direction of the main air duct 33, and a plurality of second air inlet pipes 32 are evenly spaced along the length direction of the main air duct 33. In other embodiments, the first air inlet pipe 31 can be provided as one, two, or any other number, and the second air inlet pipe 32 can be provided as one, two, or any other number, and the number of the first air inlet pipe 31 and the second air inlet pipe 32 can be the same or different. In this embodiment, the number of the first air inlet pipe 31 and the second air inlet pipe 32 is the same.

[0038] The ends of the first air inlet pipe 31 and the second air inlet pipe 32 away from the main air duct 33 are both air inlets, and the air inlets are arranged toward the adjacent condensing pipe group 11. After the hot air flows out of the installation space, a part of it flows into the air inlet, and then flows into the main air duct 33 through the first air inlet pipe 31 and the second air inlet pipe 32, and then flows into the first air duct and the second air duct through the main air duct 33, heating the primary air and the secondary air, reducing the situation where the exhaust gas temperature at the outlet of the air preheater 2 is lower than the acid dew point and the water dew point, thereby reducing the corrosion and blockage of the air preheater 2.

[0039] In order to facilitate the control of the air volume flowing into the first air duct and the second air duct, electric dampers 5 are provided in the first air inlet duct 31 and the second air inlet duct 32. The electric dampers 5 block the air inlets of the first air inlet duct 31 and the second air inlet duct 32. By controlling the opening size of the electric dampers 5, the size of the air inlet is controlled, thereby realizing the control of the air inlet volume of the first air duct and the second air duct.

[0040] In order to make it easier for hot air to enter the first air inlet duct 31 and the second air inlet duct 32, a wind shield 4 is installed on the ventilation pipe 3. In this embodiment, two wind shields 4 are provided, and both wind shields 4 are connected to the main air duct 33, and one end of each wind shield 4 away from the main air duct 33 is extended in the direction close to the condensing pipe group 11, so that after the hot air flows out of the installation space, the hot air will be blocked by the wind shield 4 and enter the first air inlet duct 31 and the second air inlet duct 32. In other embodiments, multiple or one wind shield 4 can be provided, as long as it can facilitate the hot air to flow into the first air inlet duct 31 and the second air inlet duct 32, and the wind shield 4 can also be installed on the first air inlet duct 31 and the second air inlet duct 32 in other embodiments, and the specific installation position can be changed according to the actual construction environment.

[0041] In order to make the heating system of the air preheater 2 adapt to different working conditions, the wind shield 4 is rotatably connected to the main air duct 33. The wind shield effect of the wind shield 4 can be adjusted by adjusting the angle between the wind shield 4 and the main air duct 33, thereby adjusting the flow rate of hot air flowing into the first air inlet duct 31 and the second air inlet duct 32.

[0042] In this embodiment, in order to facilitate the adjustment of the angle of the wind shield 4, the wind shield 4 is rotatably connected to the main air duct 33 through a rotating shaft, and the wind shield 4 is fixedly connected to the rotating shaft. The rotating shaft is driven to rotate by a motor, so that the motor drives the wind shield 4 to rotate, thereby realizing the angle adjustment between the wind shield 4 and the main air duct 33.

[0043] In other embodiments, a damping member may be provided between the rotating shaft and the main air duct 33 to limit the natural rotation of the wind shield 4. The wind shield 4 may be manually rotated, and after being rotated into place, the natural rotation of the wind shield 4 may be limited by the damping member.

[0044] There is a gap between the end of the wind shield 4 away from the ventilation pipe 3 and the air-cooling island 1. Part of the hot air is guided into the air inlet pipe to meet the air intake demand, and the other part of the hot air flows out through the gap between the two and dissipates into the atmosphere, ensuring a good heat exchange effect of the air-cooling island 1.

[0045] The implementation principle of the embodiment of the present application is: the hot air generated by the air-cooling island 1 flows into the first air inlet duct 31 and the second air inlet duct 32, and then flows into the first air duct and the second air duct of the air preheater 2 through the main air duct 33, thereby heating the primary air and the secondary air, ensuring the temperature of the primary air and the secondary air, and reducing the situation where the exhaust gas temperature at the outlet of the air preheater 2 is lower than the acid dew point and the water dew point, thereby reducing the corrosion and blockage of the air preheater 2.

[0046] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An air preheater heating system, characterized in that: It comprises an air preheater (2), an air cooling island (1) and a vent pipe (3), wherein one end of the vent pipe (3) is arranged on one side of the air cooling island (1) and is capable of collecting hot air produced by the air cooling island (1), and the other end of the vent pipe (3) is connected to both the primary air duct and the secondary air duct of the air preheater (2) and is used to output the hot air to the primary air duct and the secondary air duct of the air preheater (2).

2. The air preheater heating system according to claim 1, characterized in that: There are a plurality of the air-cooling islands (1), the plurality of the air-cooling islands (1) are arranged side by side, and a ventilation pipe (3) is provided between every two adjacent air-cooling islands (1); The ventilation pipe (3) comprises a first air inlet pipe (31), a second air inlet pipe (32) and a main air pipe (33); the main air pipe (33) is respectively connected to the first air duct and the second air duct of the air preheater (2); the first air inlet pipe (31) and the second air inlet pipe (32) are respectively arranged on both sides of the main air pipe (33) and are both connected to the main air pipe (33); the first air inlet pipe (31) and the second air inlet pipe (32) are respectively arranged in one-to-one correspondence with the positions of two adjacent air cooling islands (1); and the air inlet on the first air inlet pipe (31) and the air inlet on the second air inlet pipe (32) are both arranged towards the corresponding air cooling island (1).

3. The air preheater heating system according to claim 2, characterized in that: A plurality of the first air inlet pipes (31) are provided, and the plurality of the first air inlet pipes (31) are arranged along the length direction of the main air pipe (33) and are all connected to the main air pipe (33).

4. The air preheater heating system according to claim 2, characterized in that: A plurality of the second air inlet pipes (32) are provided, and the plurality of the second air inlet pipes (32) are arranged along the length direction of the main air pipe (33) and are all connected to the main air pipe (33).

5. The air preheater heating system according to claim 2, characterized in that: The first air inlet pipe (31) and the second air inlet pipe (32) are both installed with electric dampers (5), and the electric dampers (5) are used to control the opening size of the air inlet ports of the air inlet pipes.

6. The air preheater heating system according to claim 1, characterized in that: The ventilation pipe (3) is connected to a wind shield (4), and the wind shield (4) is extended in a direction close to the air cooling island (1).

7. The air preheater heating system according to claim 6, characterized in that: The wind shield (4) is rotatably connected to the ventilation pipe (3).

8. The air preheater heating system according to claim 6, characterized in that: There is a gap between the end of the wind shield (4) away from the ventilation pipe (3) and the air cooling island (1).

Images