Protection mechanism for preheater

Abstract

The utility model relates to a protection mechanism for a preheater. According to the protection mechanism for the preheater, the filter screen is arranged, so that the preheater can be effectively protected in the using process of the protection mechanism, and the situation that a heat exchange plate in the preheater is damaged by particulate matter in smoke dust can be effectively avoided; by arranging the cleaning assembly, the effect of automatically cleaning the filter screen can be achieved under the driving action of smoke dust in the using process, and therefore the situation that the filter screen is blocked due to long-time use of the filter screen is avoided; and by arranging the cleaning pipe and the control valve, the effect of discharging smoke particles cleaned from the filter screen can be effectively achieved in the using process of the device, and therefore the situation that the smoke particles cleaned from the cleaning assembly cause secondary blockage to the filter screen is avoided.

Description

Technical Field

[0001] This utility model relates to the field of preheater technology, specifically a protective mechanism for a preheater. Background Technology

[0002] An air preheater is a device that uses the heat from the flue gas at the boiler tail end to heat the air needed for combustion and pulverization. It is widely used in industrial fields such as coal-fired power plant boilers. Among them, the heat pipe air preheater is one type, which uses the heat energy carried by the flue gas at the boiler outlet and operates through the superconducting heat transfer of heat pipes.

[0003] During long-term use, preheaters are subject to corrosion and wear from various factors, such as high-temperature oxidation and flue gas corrosion. These factors can lead to a decline in equipment performance or even cause malfunctions. Therefore, it is usually necessary to install appropriate protective mechanisms to protect them, thereby slowing down the aging process and extending their service life.

[0004] Existing preheater protection mechanisms typically involve installing filters at the flue gas inlet to reduce damage to the preheater from particulate matter in the flue gas. However, after prolonged use, these filters are prone to clogging, affecting the efficiency of flue gas intake and preventing automatic cleaning. This necessitates frequent replacement by staff, increasing their workload. Therefore, a new preheater protection mechanism is proposed to address these issues. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a protective mechanism for preheaters, which has the advantages of automatically cleaning the filter device and solves the problem of easy clogging of the filter device in existing technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a protective mechanism for a preheater, comprising a preheater for preheating, a connecting pipe for transmitting a medium connected to the preheater, an evaporator for evaporation connected to the other end of the connecting pipe, a heat exchange assembly disposed inside the preheater, a protective chamber disposed on the preheater, and a flue gas inlet disposed on the protective chamber.

[0007] The heat exchange assembly includes a heat exchange plate for heat exchange, an inlet pipe for introducing flue gas is provided at the top of the heat exchange plate, an exhaust pipe for discharging flue gas is provided at the bottom of the heat exchange plate, a filter screen for protection is provided at the top of the inlet pipe, a connecting platform is provided at the top of the filter screen, and a cleaning component for cleaning the filter screen is rotatably connected to the connecting platform.

[0008] Furthermore, the smoke inlet pipe is equipped with a cleaning pipe for cleaning and a control valve for controlling the opening and closing of the cleaning pipe.

[0009] Furthermore, the cleaning component includes a connecting ring, which is rotatably connected to the connecting platform, and a transmission impeller for transmission is disposed inside the connecting ring.

[0010] Furthermore, two cleaning rods for cleaning the filter screen are symmetrically arranged on the outer peripheral wall of the connecting ring.

[0011] Furthermore, both cleaning rods are provided with a first cleaning brush and a second cleaning brush on their inner sides for cleaning the filter screen, and both the first cleaning brush and the second cleaning brush are kept in close contact with the filter screen.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] I. The protective mechanism for the preheater, by being equipped with a filter screen, effectively protects the preheater during use, thereby preventing particulate matter in the flue gas from damaging the heat exchange plates inside the preheater. By being equipped with a cleaning component, the filter screen can be automatically cleaned by the action of flue gas during use, thus preventing it from becoming clogged due to prolonged use.

[0014] Second, the protective mechanism used in the preheater is equipped with a cleaning pipe and a control valve, which can effectively discharge the dust particles cleaned off the filter screen during use, thereby preventing the dust particles cleaned off by the cleaning component from causing secondary clogging of the filter screen. Attached Figure Description

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

[0016] Figure 2 This is a schematic diagram of the internal structure of the heat exchanger of this utility model;

[0017] Figure 3 This is a schematic diagram of the heat exchange component structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the cleaning component structure of this utility model.

[0019] In the diagram: 1. Preheater; 11. Connecting pipe; 12. Evaporator; 13. Protective chamber; 14. Smoke inlet; 2. Heat exchange assembly; 21. Heat exchange plate; 22. Smoke inlet pipe; 23. Smoke exhaust pipe; 24. Cleaning pipe; 25. Filter screen; 26. Connecting platform; 27. Control valve; 3. Cleaning assembly; 31. Connecting ring; 32. Drive impeller; 33. Cleaning rod; 34. First cleaning brush; 35. Second cleaning brush. Detailed Implementation

[0020] 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.

[0021] Example 1:

[0022] Please see Figure 1-3 This embodiment provides a protective mechanism for a preheater, including a preheater 1 for preheating, a connecting pipe 11 for transmitting a medium connected to the preheater 1, an evaporator 12 for evaporation connected to the other end of the connecting pipe 11, a heat exchange assembly 2 inside the preheater 1, a protective chamber 13 on the preheater 1, and a flue gas inlet 14 on the protective chamber 13 for introducing flue gas; the heat exchange assembly 2 includes a heat exchange plate 21 for heat exchange, a flue gas inlet pipe 22 on the top of the heat exchange plate 21 for introducing flue gas, a flue gas exhaust pipe 23 on the bottom of the heat exchange plate 21 for discharging flue gas, a protective filter screen 25 on the top of the flue gas inlet pipe 22, a connecting platform 26 on the top of the filter screen 25, and a cleaning assembly 3 for cleaning the filter screen 25 rotatably connected to the connecting platform 26.

[0023] As a preferred technical solution in this embodiment: In actual use, the operator can control the high-temperature flue gas to enter through the flue gas inlet 14 on the preheater 1. The flue gas will enter the protective chamber 13. The flue gas in the protective chamber 13 will enter the heat exchange plate 21 after being filtered by the filter screen 25, thereby raising the temperature of the heat exchange plate 21. When the heat exchange plate 21 is heated, it can effectively heat the water that needs to be preheated in the preheater 1. The heated water will enter the evaporator 12 through the connecting pipe 11, thereby achieving the evaporation effect under the action of the evaporator 12. At the same time, as the high-temperature flue gas enters the flue gas inlet pipe 22 through the filter screen 25, the flue gas will drive the cleaning component 3 to rotate. During the rotation of the cleaning component 3, the filter screen 25 can be automatically cleaned, thereby avoiding the situation where the filter screen 25 becomes clogged after long-term use.

[0024] The technical effects of the above embodiments are as follows: by providing a filter screen 25, the preheater 1 can be effectively protected during use, thereby effectively preventing particulate matter in the smoke and dust from damaging the heat exchange plate 21 inside the preheater 1. By providing a cleaning component 3, the filter screen 25 can be automatically cleaned under the action of smoke and dust during use, thereby preventing it from becoming clogged due to prolonged use.

[0025] Example 2:

[0026] Please see Figure 4 To achieve automatic cleaning of the filter screen 25, the smoke inlet pipe 22 in this embodiment is equipped with a cleaning pipe 24 for cleaning and a control valve 27 for controlling the opening and closing of the cleaning pipe 24. The cleaning assembly 3 includes a connecting ring 31, which is rotatably connected to the connecting platform 26. A transmission impeller 32 for transmission is provided inside the connecting ring 31. Two cleaning rods 33 for cleaning the filter screen 25 are symmetrically arranged on the outer peripheral wall of the connecting ring 31. A first cleaning brush 34 and a second cleaning brush 35 for cleaning the filter screen 25 are provided on the inner side of each cleaning rod 33. Both the first cleaning brush 34 and the second cleaning brush 35 are kept in close contact with the filter screen 25.

[0027] As a preferred technical solution in this embodiment: In actual use, when the staff needs to clean the filter screen 25, the cleaning pipe 24 can be connected to the smoke inlet pipe 22 and the filter screen 25 by controlling the control valve 27, and the smoke inlet pipe 22 can be closed with the heat exchange plate 21. At this time, the staff can introduce gas into the cleaning pipe 24 to achieve the desired effect of back-blowing the filter screen 25, thereby achieving a good removal effect of the dust particles attached to the outer surface of the filter screen 25, and through the back-blowing effect, the cleaned dust can be discharged through the smoke inlet hole 14.

[0028] During the process of high-temperature flue gas entering the heat exchange plate 21, the flowing high-temperature flue gas will drive the drive impeller 32 to rotate, thereby enabling the drive impeller 32 to drive the connecting ring 31 to rotate. During the rotation of the connecting ring 31, the cleaning rod 33 will rotate, thereby enabling the cleaning rod 33 to drive the first cleaning brush 34 and the second cleaning brush 35 to remove the dust particles attached to the surface of the filter screen 25, thus avoiding clogging during use.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protection mechanism for a preheater, comprising a preheater (1) for preheating, characterized by: The preheater (1) is connected with a connecting pipe (11) for transmitting medium, the other end of the connecting pipe (11) is connected with an evaporator (12) for evaporation, the inside of the preheater (1) is provided with a heat exchange assembly (2), the preheater (1) is provided with a protection bin (13), the protection bin (13) is provided with a smoke inlet hole (14) for passing in flue gas; The heat exchange assembly (2) comprises heat exchange plates (21) for heat exchange, the top of the heat exchange plates (21) is provided with a smoke inlet pipe (22) for passing in flue gas, the bottom of the heat exchange plates (21) is provided with a smoke outlet pipe (23) for discharging flue gas, the top of the smoke inlet pipe (22) is provided with a filter screen (25) for protection, the top of the filter screen (25) is provided with a connecting table (26), the connecting table (26) is rotatably connected with a cleaning assembly (3) for cleaning the filter screen (25).

2. A guard mechanism for a preheater according to claim 1, characterized in that: The smoke inlet pipe (22) is provided with a cleaning pipe (24) for cleaning and a control valve (27) for controlling the on-off of the cleaning pipe (24).

3. A guard mechanism for a preheater according to claim 1, characterized in that: The cleaning assembly (3) comprises a connecting ring (31), the connecting ring (31) is rotatably connected to the connecting table (26), and the connecting ring (31) is provided with a transmission wind wheel (32) for transmission.

4. A guard mechanism for a preheater according to claim 3, characterized in that: The outer peripheral wall of the connecting ring (31) is symmetrically provided with two cleaning rods (33) for cleaning the filter screen (25).

5. A guard mechanism for a preheater according to claim 4, characterized in that: The inner sides of the two cleaning rods (33) are provided with a first cleaning brush (34) and a second cleaning brush (35) for cleaning the filter screen (25), and the first cleaning brush (34) and the second cleaning brush (35) are in close contact with the filter screen (25).

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