A smoke flow guiding device for a smoke fan

Abstract

The utility model discloses a kind of induced draft fan flue gas flow guide devices, it is related to flue gas sealing field, the technical scheme of the utility model includes flue gas collection tank and flow guide duct;The flue gas collection tank cover is located at the air outlet smoke leakage of induced draft fan;One end of the flow guide duct is communicated with the flue gas collection tank, another end of the flow guide duct is communicated with the air inlet side wall of the induced draft fan.Through setting flue gas collection tank and flow guide duct, the negative pressure area of induced draft fan air inlet is ingeniously used, and the leaked flue gas is flowed to induced draft fan air inlet, flue gas is recycled again, avoid expansion, more environmental protection, lower cost.

Description

Technical Field

[0001] This utility model relates to the field of flue gas sealing, and in particular to a flue gas diversion device for an induced draft fan. Background Technology

[0002] In power plants, induced draft fans used for bearing cooling provide power for airflow, and flue gas also flows through the ducts through which the airflow passes. However, due to design flaws by the manufacturer, the downwind section of the induced draft fan suffers from flue gas sealing failure, causing flue gas to easily leak from the exhaust port. Routine maintenance schedules make comprehensive inspections difficult, and advanced maintenance is challenging and costly. Completely sealing the exhaust port poses a safety hazard to the induced draft fan. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a flue gas diversion device for an induced draft fan. By setting up a flue gas collection box and a diversion pipe, it cleverly utilizes the negative pressure zone at the air inlet of the induced draft fan to divert the leaked flue gas to the air inlet of the induced draft fan, thereby recovering the flue gas, avoiding its spread, making it more environmentally friendly, and lower in cost.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a flue gas diversion device for an induced draft fan, including a flue gas collection box and a diversion pipe;

[0005] The flue gas collection box cover is installed at the smoke leakage point of the exhaust vent of the induced draft fan;

[0006] One end of the guide pipe is connected to the flue gas collection box, and the other end of the guide pipe is connected to the side wall of the air inlet of the induced draft fan.

[0007] A flue gas collection box is installed at the smoke leakage point of the exhaust vent. Therefore, leaked smoke will directly enter the flue gas collection box. The collection box is connected to the side wall of the exhaust fan's inlet via a guide pipe. Because the airflow flows towards the fan blades, the exhaust fan's inlet creates negative pressure. After passing the fan blades, the airflow flows towards the exhaust vent, creating positive pressure at the leakage point. Thus, the smoke collected in the collection box is under positive pressure and flows to the other end of the guide pipe, which is under negative pressure, i.e., the exhaust fan's inlet. In this way, the leaked smoke will flow back into the exhaust fan's duct.

[0008] Preferably, the guide duct is equipped with a one-way valve, which only allows airflow to flow towards the inlet of the induced draft fan, preventing flue gas from flowing back from the outlet of the guide duct.

[0009] Preferably, the one-way valve includes at least two, one of which is located at the downstream end of the flow guide pipe, and the other is located in the middle of the flow guide pipe. Multiple one-way valves can be used to form a segment, preventing the flow from being effectively blocked by the first one-way valve, thus controlling the flow between it and another one-way valve.

[0010] Preferably, the side wall of the air inlet of the induced draft fan is provided with a side opening that communicates with the guide pipe, and a guide shroud is provided at the air inlet of the induced draft fan corresponding to the side opening, and a shroud opening is provided on one side of the induced draft fan.

[0011] Preferably, the flue gas collection box is made of stainless steel plate, which is more durable and corrosion-resistant.

[0012] Preferably, the flow guide pipe is made of stainless steel, which is more durable and corrosion-resistant.

[0013] Preferably, a sealing gasket is provided at the connection between the guide pipe and the flue gas collection box cover to improve the sealing effect.

[0014] The beneficial effects of this utility model are:

[0015] By setting up a flue gas collection box and a diversion pipe, the negative pressure zone at the air inlet of the induced draft fan is cleverly utilized to divert the leaked flue gas to the air inlet of the induced draft fan, thereby recovering the flue gas and preventing it from spreading outwards. This is more environmentally friendly and lower in cost. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only one of the drawings of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an embodiment of the present utility model;

[0018] The components include: 1. Exhaust fan; 2. Flue gas collection box; 3. Diversion pipe; 4. Check valve; 5. Diversion hood. Detailed Implementation

[0019] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0020] Example

[0021] like Figure 1As shown, an induced draft fan flue gas diversion device includes a flue gas collection box 2 and a diversion pipe 3;

[0022] The flue gas collection box 2 is installed over the smoke leakage point at the exhaust port of the induced draft fan 1;

[0023] One end of the guide pipe 3 is connected to the flue gas collection box 2, and the other end of the guide pipe 3 is connected to the side wall of the air inlet of the induced draft fan 1.

[0024] A flue gas collection box 2 is installed at the smoke leakage point of the exhaust vent. Therefore, leaked smoke will directly enter the flue gas collection box 2. The flue gas collection box 2 is connected to the side wall of the air inlet of the induced draft fan 1 via a guide pipe 3. Because the airflow flows towards the fan blades of the induced draft fan 1, the air inlet of the induced draft fan 1 will experience negative pressure. After passing through the fan blades, the airflow flows towards the exhaust vent, so the smoke leakage point is under positive pressure. Therefore, the smoke collected by the flue gas collection box 2 is under positive pressure and will flow to the other end of the guide pipe 3, which is under negative pressure, i.e., the air inlet of the induced draft fan 1. Thus, the leaked smoke will flow back into the duct of the induced draft fan 1.

[0025] The flow guide duct 3 is equipped with a one-way valve 4, which only allows airflow to flow towards the air inlet of the induced draft fan 1. This prevents flue gas from flowing back from the downflow outlet of the flow guide duct 3.

[0026] The one-way valve 4 includes at least two, one of which is located at the downwind end of the flow guide pipe 3, and the other one-way valve 4 is located in the middle of the flow guide pipe 3. Multiple one-way valves 4 can be used to form a segment, preventing the flow from being effectively blocked by the first one-way valve 4, thus controlling the flow between it and another one-way valve 4.

[0027] The air inlet of the blower 1 is provided with a side opening that communicates with the guide pipe 3. A guide hood 5 is provided at the air inlet of the blower 1 corresponding to the side opening. The guide hood 5 is provided with a hood opening on one side of the blower 1.

[0028] The flue gas collection box 2 is made of stainless steel. The guide pipe 3 is also made of stainless steel, making it more durable and corrosion-resistant.

[0029] A sealing gasket is provided at the connection between the flow guide pipe 3 and the flue gas collection box 2 cover to improve the sealing effect.

[0030] The beneficial effects of this utility model are:

[0031] By setting up a flue gas collection box 2 and a diversion pipe 3, the negative pressure zone at the air inlet of the induced draft fan 1 is cleverly utilized to divert the leaked flue gas to the air inlet of the induced draft fan 1, thereby recovering the flue gas, preventing it from spreading outward, making it more environmentally friendly and lower in cost.

[0032] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A flue gas diversion device for an induced draft fan, characterized in that, Includes a flue gas collection box (2) and a diversion pipe (3); The flue gas collection box (2) is installed over the exhaust port of the induced draft fan (1) where smoke leaks out; One end of the guide pipe (3) is connected to the flue gas collection box (2), and the other end of the guide pipe (3) is connected to the air inlet side wall of the induced draft fan (1).

2. The induced draft fan flue gas diversion device according to claim 1, characterized in that: The flow guide pipe (3) is equipped with a one-way valve (4), which only allows airflow to flow to the air inlet of the induced draft fan (1).

3. The induced draft fan flue gas diversion device according to claim 2, characterized in that: The one-way valve (4) includes at least two, one of which is located at the downwind end of the flow guide pipe (3), and the other one-way valve (4) is located in the middle of the flow guide pipe (3).

4. The induced draft fan flue gas diversion device according to claim 1, characterized in that: The air inlet of the blower (1) is provided with a side opening that communicates with the guide pipe (3). The air inlet of the blower (1) is provided with a guide hood (5) corresponding to the side opening. The guide hood (5) is provided with a hood opening on one side of the blower (1).

5. The induced draft fan flue gas diversion device according to claim 1, characterized in that: The flue gas collection box (2) is made of stainless steel plate.

6. The induced draft fan flue gas diversion device according to claim 1, characterized in that: The guide pipe (3) is made of stainless steel.

7. The induced draft fan flue gas diversion device according to claim 1, characterized in that: A sealing gasket is provided at the connection between the flow guide pipe (3) and the cover of the flue gas collection box (2).

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