CFB boiler material returning fan

Abstract

The utility model relates to a CFB (circulating fluid bed) boiler material returning fan which comprises a cabinet, a controller and a Roots blower arranged in the cabinet, and further comprises a filtering mechanism arranged on the side wall of the cabinet and communicated with an air inlet of the Roots blower. The filtering mechanism comprises a shell penetrating through the cabinet, an air outlet of the shell is communicated with an air inlet of the Roots blower, and the air inlet of the shell is communicated with the outside; more than one first mounting opening is formed in the side wall, close to the air outlet of the shell, of the shell, and a filter plate is detachably arranged on each first mounting opening; more than one second mounting opening is formed in the side wall, close to the air inlet of the shell, of the shell, fins are detachably arranged on the second mounting openings, and gaps are reserved between the fins and the side wall of the inner side of the shell; the shell is provided with thermoelectric refrigeration sheets which are in contact with the fins; a water outlet is formed in the bottom of the shell; and the Roots blower and the thermoelectric refrigeration sheet are electrically connected with the controller respectively. According to the CFB boiler material returning fan, dust can be prevented from entering, and effective cooling can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of CFB boiler equipment, in particular to a return air blower for a CFB boiler. Background Art

[0002] The return air blower is one of the core equipment in boiler equipment to form a circulating fluidized bed for materials. The function of the return air blower is to loosen and fluidize the materials. At present, many power plants use Roots blowers as return air blowers, which are installed in a dedicated cabinet with a dust-proof protective cover. During the actual operation, dust will be generated during the coal combustion process in the power plant. Although dust treatment has been carried out, there is still a small amount of dust discharged (meeting the emission standards). Due to the relatively high temperature of the coal combustion environment in the power plant, the temperature of the air (with dust) input into the Roots blower is relatively high, while the working temperature of the Roots blower is relatively low (normally between 50°C and 80°C, and the maximum does not exceed 90°C). Often, the cabinet door is opened to dissipate heat, which causes dust to enter the Roots blower through the cabinet door, resulting in internal wear of the Roots blower, and further causing the noise generated by vibration during the operation of the Roots blower to increase, requiring frequent maintenance and high maintenance costs. Summary of the Utility Model

[0003] Therefore, in view of the above problems, the utility model provides a return air blower for a CFB boiler, which can prevent dust from entering and can effectively cool down.

[0004] To achieve the above object, the utility model adopts the following technical solutions:

[0005] A return air blower for a CFB boiler, comprising a cabinet, a controller and a Roots blower arranged in the cabinet, and further comprising a filtering mechanism arranged on the side wall of the cabinet and communicated with the air inlet of the Roots blower;

[0006] The filtering mechanism comprises a housing penetrating through the cabinet. The housing has an air inlet and an air outlet. The air outlet of the housing is communicated with the air inlet of the Roots blower, and the air inlet of the housing is communicated with the outside;

[0007] One or more first mounting openings penetrating to the inside of the housing are formed on the side wall of the housing near the air outlet of the housing, and filter plates are detachably arranged on each of the first mounting openings;

[0008] One or more second mounting openings penetrating to the inside of the housing are formed on the side wall of the housing near the air inlet of the housing, and fins are detachably arranged on each of the second mounting openings, and a gap is left between the fins and the inner side wall of the housing; a thermoelectric cooling sheet in contact with each of the fins is arranged on the housing;

[0009] A drain port is formed at the bottom of the housing;

[0010] The Roots blower and the thermoelectric cooling sheet are respectively electrically connected to the controller.

[0011] Furthermore, the second mounting openings are alternately and spacedly arranged on the upper sidewall and the lower sidewall of the housing.

[0012] Furthermore, the filtering mechanism further includes a booster fan, and the booster fan is communicated with the air inlet of the housing;

[0013] The booster fan is electrically connected to the controller.

[0014] Furthermore, it further includes a blower outlet pipe and a check valve arranged in the cabinet. The air outlet of the Roots blower is communicated with the blower outlet pipe through the check valve, and the blower outlet pipe penetrates through the cabinet.

[0015] Furthermore, a wind pressure sensor is installed on the blower outlet pipe;

[0016] The wind pressure sensor is electrically connected to the controller.

[0017] By adopting the foregoing technical solutions, the beneficial effects of the present utility model are as follows:

[0018] The CFB boiler return air blower filters dust in the air by arranging a filtering mechanism. Specifically, when the air is sucked by the Roots blower from the filtering mechanism, the fins are cooled by the thermoelectric cooling sheet. When the moisture in the air contacts the cooled fins, it will condense and liquefy into water. The excess water drops into the housing and is discharged from the drain port. Most of the pulverized coal contained in the air will be adsorbed and agglomerated when it encounters the water on the surface of the fins, thereby reducing the dust in the air in the filtering mechanism. Moreover, a filter plate is also arranged in the filtering mechanism to further adsorb the remaining small amount of dust in the air, thereby effectively preventing dust from entering the Roots blower. And, since the air is cooled and then input into the Roots blower, the temperature of the Roots blower can also be reduced. When maintaining the filtering mechanism, only the fins and the filter plate need to be taken out and rinsed clean, which is convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall internal structure of the CFB boiler return air blower.

[0020] Figure 2 is a schematic diagram of the internal structure of the filtering mechanism.

[0021] Figure 3 is a circuit connection block diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0023] Refer to Figure 1 、Figure 2 And Figure 3 In this embodiment, a CFB boiler return air blower is provided, including a cabinet 1. A Roots blower 2, a check valve 4 and a blower outlet pipe 5 are arranged in the cabinet 1. The air outlet of the Roots blower 2 (not marked in the figure) is communicated with the blower outlet pipe 5 through the check valve 4, and the blower outlet pipe 5 penetrates through the cabinet 1. The check valve 4 prevents air from flowing back.

[0024] A wind pressure sensor 6 for detecting the wind pressure in the blower outlet pipe 5 is installed on the blower outlet pipe 5.

[0025] A filtering mechanism 3 communicated with the air inlet of the Roots blower 2 (not marked in the figure, and those skilled in the art should be able to know the position of the air inlet of the Roots blower 2 according to the specification and the accompanying drawings of the specification) is arranged on the side wall of the cabinet 1.

[0026] It further includes a controller 7 and a booster blower 8. The controller 7 and the booster blower 8 can be arranged outside the casing 1 and are not shown in Figure 1 When the wind pressure sensor 6 detects that the wind pressure in the blower outlet pipe 5 is insufficient, the booster blower 8 is controlled to boost the pressure, increasing the air volume input into the Roots blower 2.

[0027] The filtering mechanism 3 includes a housing 30 penetrating through the cabinet 1 and a booster blower 8. The housing 30 has an air inlet 301 and an air outlet 300. The air outlet of the housing 30 is communicated with the air inlet of the Roots blower 2, and the air inlet of the housing 30 is communicated with the outside. The booster blower 8 is communicated with the air inlet 301 of the housing 30 (not shown in the figure).

[0028] More specifically, one or more first installation openings (not marked in the figure) penetrating through the inside of the housing 30 are formed on the side wall of the housing 30 near the air outlet 300, and filter plates 33 are detachably arranged on each of the first installation openings; in this specific embodiment, the number of the filter plates 33 is set to one, and the number of the first installation openings is set to one.

[0029] One or more second installation openings (not marked in the figure) penetrating through the inside of the housing 30 are formed on the side wall of the housing 30 near the air inlet 301, and fins 31 are detachably arranged on each of the second installation openings, and a gap is left between the fins 31 and the inner side wall of the housing 30 for air circulation; preferably, the second installation openings are alternately arranged at intervals on the upper side wall and the lower side wall of the housing 30, that is, the fins 31 are alternately arranged at intervals on the upper side wall and the lower side wall of the housing 30. In this specific embodiment, the number of the fins 31 is set to three, and the number of the second installation openings is also set to three.

[0030] A thermoelectric cooling sheet 32 in contact with each of the fins 31 is arranged on the housing 30.

[0031] A drain port 34 for draining water is provided at the bottom of the housing 30.

[0032] The roots blower 2, the air pressure sensor 6, the booster blower 8 and each thermoelectric cooling sheet 32 are electrically connected to the controller 7 respectively.

[0033] When air is sucked into the filtering mechanism 3 by the roots blower 2, the fin 31 is cooled by the thermoelectric cooling sheet 32. When the moisture in the air contacts the cooled fin 31, it will condense and liquefy into water. The excess water drops into the housing 30 and is discharged from the drain port 34. When the pulverized coal contained in the air encounters the water on the surface of the fin, it will adsorb and agglomerate, thereby reducing the dust in the air in the filtering mechanism 3. Moreover, a filter plate 32 is further provided in the filtering mechanism 3 to further adsorb the dust in the air, thereby effectively preventing the dust from entering the roots blower 2. And, since the air is cooled and then input into the roots blower 2, the temperature of the roots blower 2 can also be reduced, so that the roots blower 2 can work normally at the rated temperature.

[0034] When maintaining the filtering mechanism 3, only the fin 31 and the filter plate 32 need to be taken out and rinsed clean, which is convenient to use and has practicability.

[0035] Although the present invention is specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all of them are within the protection scope of the present invention.

Claims

1. A CFB boiler return air fan, comprising a cabinet, a controller, and a Roots blower arranged in the cabinet, characterized in that: It further comprises a filtering mechanism arranged on the side wall of the cabinet and communicated with the air inlet of the Roots blower; The filtering mechanism comprises a housing penetrating through the cabinet, the housing has an air inlet and an air outlet, the air outlet of the housing is communicated with the air inlet of the Roots blower, and the air inlet of the housing is communicated with the outside; One or more first mounting openings penetrating through to the inside of the housing are formed on the side wall of the housing close to the air outlet of the housing, and filter plates are respectively detachably arranged on each of the first mounting openings; One or more second mounting openings penetrating through to the inside of the housing are formed on the side wall of the housing close to the air inlet of the housing, fins are respectively detachably arranged on each of the second mounting openings, and a gap is left between the fins and the inner side wall of the housing; a thermoelectric cooler is arranged on the housing and contacts each of the fins; A drain port is formed at the bottom of the housing; The Roots blower and the thermoelectric cooler are respectively electrically connected to the controller.

2. The return air blower of a CFB boiler according to claim 1, characterized in that: The second mounting openings are alternately and spacedly arranged on the upper side wall and the lower side wall of the housing.

3. A CFB boiler return air blower according to claim 1, characterized in that: The filtering mechanism further comprises a booster fan, and the booster fan is communicated with the air inlet of the housing; The booster fan is electrically connected to the controller.

4. A CFB boiler return air blower according to claim 1, characterized in that: It further comprises a fan outlet pipe and a check valve arranged in the cabinet, the air outlet of the Roots blower is communicated with the fan outlet pipe through the check valve, and the fan outlet pipe penetrates out of the cabinet.

5. A CFB boiler return air blower according to claim 4, characterized in that: A wind pressure sensor is installed on the fan outlet pipe; The wind pressure sensor is electrically connected to the controller.

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