Anti-blocking device for dust exhaust fan of boiler ash silo

Abstract

The utility model discloses an anti-blocking device for a dust discharge fan of a boiler ash silo, which particularly relates to the technical field of boilers and comprises an ash silo, a dust discharge fan and a pneumatic shut-off valve. An outlet section of the ash silo is connected with an inlet of the dust exhaust fan, an outlet of the dust exhaust fan is connected with a pneumatic shut-off valve through an outlet pipeline, and the pneumatic shut-off valve is communicated with the inlet of the ash silo; an interlock is arranged between the pneumatic shut-off valve and the dust exhaust fan, when the dust exhaust fan is started, the pneumatic shut-off valve is automatically opened, and when the dust exhaust fan stops or trips, the pneumatic shut-off valve is automatically closed. The pneumatic shut-off valve is mounted on the outlet pipeline of the dust exhaust fan, and the pneumatic shut-off valve and the dust exhaust fan are interlocked, so that dust in the dust silo is prevented from flowing back into the dust exhaust fan and the pipeline from the pipeline when the dust exhaust fan stops, and the fan is blocked and cannot be started.

Description

Technical Field

[0001] The present application relates to the technical field of boilers, and in particular to a device for preventing dust exhaust fans from blocking a boiler ash silo. Background Art

[0002] A boiler is an energy conversion device. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives. It can also be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. It is mostly used in thermal power plants, ships, locomotives and industrial and mining enterprises.

[0003] The boiler is mainly composed of furnace, drum, burner, water-cooled wall, superheater, economizer, air preheater, frame and furnace wall and some auxiliary equipment. The ash produced by the boiler is sent to the ash bin by the pneumatic ash conveying system and then transported away by the ash truck. When the ash is discharged, a small amount of ash will emerge from the ash discharge port. Therefore, the existing technology uses a dust removal fan to suck the ash into the ash bin. When the ash discharge is completed and the dust exhaust fan stops operating, a small amount of ash in the ash bin will flow back into the dust exhaust pipe and the dust exhaust fan, causing the fan to be blocked and unable to start or damaged.

[0004] Therefore, it is necessary to design a boiler ash bin dust exhaust fan anti-blocking device to solve the above problems. Summary of the invention

[0005] In response to the above problems, the present application provides a boiler ash bin dust exhaust fan anti-blocking device to prevent the ash in the ash bin from flowing back through the pipeline to the dust exhaust fan and the pipeline when the dust exhaust fan stops, causing the fan to be blocked and unable to start or be damaged.

[0006] To achieve the purpose of this application, this application provides the following technical solutions:

[0007] A boiler ash bin dust exhaust fan anti-blocking device, comprising: an ash bin, a dust exhaust fan, and a pneumatic shut-off valve;

[0008] The outlet section of the ash bin is connected to the inlet of the dust exhaust fan, the outlet of the dust exhaust fan is connected to the pneumatic shut-off valve through an outlet pipe, and the pneumatic shut-off valve is also connected to the inlet of the ash bin;

[0009] An interlock is arranged between the pneumatic shut-off valve and the dust exhaust fan;

[0010] When the dust exhaust fan is started, the pneumatic shut-off valve is automatically opened, and when the dust exhaust fan is stopped or tripped, the pneumatic shut-off valve is automatically closed.

[0011] Furthermore, two magnetic induction switches are installed on the cylinder of the pneumatic shut-off valve, including a first magnetic switch and a second magnetic switch, which are used to monitor the switch state of the pneumatic shut-off valve.

[0012] Furthermore, the first magnetic switch is installed at the opening position of the pneumatic shut-off valve, and the second magnetic switch is installed at the closing position of the pneumatic shut-off valve.

[0013] Furthermore, the switch status of the pneumatic shut-off valve monitored by the first magnetic switch and the second magnetic switch is introduced into the DCS screen pneumatic shut-off valve status feedback through a cable.

[0014] Furthermore, the pneumatic shut-off valve is installed in the horizontal section of the outlet pipeline.

[0015] Furthermore, the pneumatic shut-off valve is a gate valve.

[0016] The beneficial effects of the utility model are as follows:

[0017] By installing a pneumatic gate valve at the outlet of the dust exhaust fan, it is prevented that the dust in the ash bin flows back into the dust exhaust fan and the pipeline when the dust exhaust fan stops, causing the fan to be unable to start or damaged. At the same time, an interlock is set between the start and stop of the dust exhaust fan and the switch of the pneumatic shut-off valve. When the dust exhaust fan starts, the pneumatic shut-off valve interlock opens, and when the dust exhaust fan stops or trips, the pneumatic shut-off valve interlock closes. Two magnetic switches are installed on the cylinder of the start shut-off valve to lead to the DCS screen so that the switch position of the pneumatic shut-off valve can be viewed remotely. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation on the present application.

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Reference numerals:

[0021] 1. Ash silo; 2. Dust exhaust fan; 3. Outlet pipe; 4. Pneumatic shut-off valve; 5. First magnetic switch; 6. Second magnetic switch. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0024] Example 1

[0025] See also Figure 1 , Figure 1 The overall structure diagram of the utility model is as follows. This embodiment provides a boiler ash bin dust exhaust fan anti-blocking device, including: an ash bin 1, a dust exhaust fan 2, and a pneumatic shut-off valve 4;

[0026] The outlet section of the ash silo 1 is connected to the inlet of the dust exhaust fan 2, and the outlet of the dust exhaust fan 2 is connected to the pneumatic shut-off valve 4 through the outlet pipe 3, and the pneumatic shut-off valve 4 is also connected to the inlet of the ash silo 1;

[0027] In a possible implementation, an interlock is provided between the pneumatic shut-off valve 4 and the dust exhaust fan 2;

[0028] When the dust exhaust fan 2 is started, the pneumatic shut-off valve 4 is automatically opened, and when the dust exhaust fan 2 is stopped or tripped, the pneumatic shut-off valve 4 is automatically closed.

[0029] In a possible implementation, two magnetic induction switches are installed on the cylinder of the pneumatic shut-off valve 4 , including: a first magnetic switch 5 and a second magnetic switch 6 ; the first magnetic switch 5 and the second magnetic switch 6 are used to monitor the switching state of the pneumatic shut-off valve 4 .

[0030] In a possible implementation manner, the first magnetic switch 5 is installed at the opening position of the pneumatic shut-off valve 4 , and the second magnetic switch 6 is installed at the closing position of the pneumatic shut-off valve 4 .

[0031] In a possible implementation manner, the pneumatic shut-off valve 4 is installed in a horizontal section of the outlet pipe 3 .

[0032] In a possible implementation, the pneumatic shut-off valve 4 is a gate valve.

[0033] In a possible implementation manner, the switch status of the pneumatic shut-off valve 4 monitored by the first magnetic switch 5 and the second magnetic switch 6 is introduced into the DCS screen pneumatic shut-off valve status feedback via a cable.

[0034] In a possible implementation, the DCS screen pneumatic shut-off valve status feedback is shown in the following table:

[0035] Table 1 DCS screen pneumatic shut-off valve status feedback table

[0036]

[0037] When the pneumatic shut-off valve 4 is in the valve-open state, the light indicating the valve-open state is on; when the pneumatic shut-off valve 4 is in the valve-closed state, the light indicating the valve-closed state is on.

[0038] The specific implementation methods of this application are as follows:

[0039] When the ash bin 1 starts to discharge ash, the dust exhaust fan 2 is started and the pneumatic shut-off valve 4 is interlocked and opened. The dust exhaust fan 2 sends the dust generated during the discharge into the ash bin 1 through the outlet pipe 3. When the pneumatic shut-off valve 4 is opened, the first magnetic induction switch 5 detects that the pneumatic shut-off valve 4 is in the open position, and sends a signal to the pneumatic shut-off valve status feedback on the DCS screen, indicating that the light of the valve open state is on; when the pneumatic shut-off valve 4 is closed, the second magnetic induction switch 6 detects that the pneumatic shut-off valve 4 is in the closed position, and sends a signal to the pneumatic shut-off valve status feedback on the DCS screen, indicating that the light of the valve closed state is on.

[0040] The beneficial effects of the embodiments of the present application are as follows:

[0041] This device can not only prevent the ash in the ash bin 1 from flowing back into the dust exhaust fan outlet pipe 3 and the dust exhaust fan 2, causing the dust exhaust fan 2 to be unable to start or be damaged due to dust accumulation, but also remotely determine whether the pneumatic shut-off valve is operating normally, thereby ensuring that the entire dust exhaust system works normally and avoiding damage to the equipment or environmental pollution caused by abnormal operation of the dust exhaust system.

[0042] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A boiler ash silo dust exhaust fan anti-blocking device, characterized in that: include: Ash silo (1), dust exhaust fan (2), pneumatic shut-off valve (4); The outlet section of the ash silo (1) is connected to the inlet of the dust exhaust fan (2), the outlet of the dust exhaust fan (2) is connected to the pneumatic shut-off valve (4) through the outlet pipe (3), and the pneumatic shut-off valve (4) is also connected to the inlet of the ash silo (1); An interlock is provided between the pneumatic shut-off valve (4) and the dust exhaust fan (2); When the dust exhaust fan (2) is started, the pneumatic shut-off valve (4) automatically opens, and when the dust exhaust fan (2) is stopped or tripped, the pneumatic shut-off valve (4) automatically closes.

2. The anti-blocking device according to claim 1, characterized in that: Two magnetic induction switches are mounted on the cylinder of the pneumatic shut-off valve (4), including a first magnetic switch (5) and a second magnetic switch (6), which are used to monitor the switch state of the pneumatic shut-off valve (4).

3. The anti-blocking device according to claim 2, characterized in that: The first magnetic switch (5) is installed at the opening position of the pneumatic shut-off valve (4), and the second magnetic switch (6) is installed at the closing position of the pneumatic shut-off valve (4).

4. The anti-blocking device according to claim 2, characterized in that: The switch status of the pneumatic shut-off valve (4) monitored by the first magnetic switch (5) and the second magnetic switch (6) is introduced into the DCS screen pneumatic shut-off valve status feedback via a cable.

5. The anti-blocking device according to claim 1, characterized in that: The pneumatic shut-off valve (4) is installed in the horizontal section of the outlet pipeline (3).

6. The anti-blocking device according to claim 5, characterized in that: The pneumatic shut-off valve (4) is a gate valve.

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