Fire grate emergency ventilation device

Abstract

The utility model discloses a fire grate emergency ventilation device which comprises a fire grate, an air chamber arranged below the fire grate and an air inducing device connected with the air chamber. The air inducing device comprises a three-way pipeline, and a first pipeline opening of the three-way pipeline is communicated with the air chamber; a second pipeline opening of the three-way pipeline is connected with a fan for introducing combustion-supporting fresh air; a third pipeline opening of the three-way pipeline is provided with a ventilation valve used for being opened during power failure, so that outdoor air enters the air inducing device through the third pipeline opening and then enters the air chamber through the first pipeline, and the problems that in the related technology, when power failure suddenly occurs, conveying of combustion-supporting fresh air is stopped, and the air chamber is damaged can be solved. And the service life of the fire grate is shortened and even the fire grate is damaged due to long-term overhigh temperature of the fire grate.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and in particular to an emergency ventilation device for a grate. Background Technology

[0002] Boilers are key equipment for converting fuel into heat energy, and chain grate stokers are the most common combustion devices in coal-fired boilers. Chain grate stokers transport fuel through continuous movement, achieving complete combustion during this process. To aid combustion, a fresh air duct and induced draft fan are typically connected to the air chamber below the grate, continuously supplying fresh air to improve combustion efficiency. However, in the event of a sudden power outage, the supply of fresh air stops, which can easily lead to prolonged excessively high grate temperatures, reducing its service life and even causing damage.

[0003] Therefore, this utility model is proposed. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide an emergency ventilation device for a grate to solve the technical problem in the related technology that when a sudden power outage occurs, the supply of combustion-supporting fresh air stops, which can easily lead to the grate temperature being too high for a long time, reducing its service life or even causing damage.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This utility model provides an emergency ventilation device for a grate, including a grate, a wind chamber disposed below the grate, and an air induced device connected to the wind chamber;

[0007] The air extraction device includes a three-way pipe, the first port of which is connected to the air chamber; the second port of which is connected to a fan for introducing combustion-supporting fresh air; and the third port of which is equipped with a ventilation valve for opening during a power outage, so that outdoor air enters the air extraction device through the third port and then enters the air chamber through the first pipe.

[0008] Optionally, multiple three-way pipes are spaced apart along the length of the air chamber. In each three-way pipe, a flap for controlling the introduction and blocking of combustion-supporting fresh air is provided on the pipe passage from the second pipe opening to the first pipe opening. Each flap is connected by a unified connecting shaft.

[0009] Optionally, in the tee pipe, the first pipe opening and the third pipe opening are coaxially arranged, and the second pipe opening is perpendicularly intersecting the axes of the first pipe opening and the third pipe opening.

[0010] Optionally, the three-way pipes are provided on both sides of the air chamber.

[0011] Optionally, the grate is a chain grate.

[0012] This utility model provides an emergency ventilation device for a grate. Instead of the existing 90-degree elbows, a three-way pipe is used at the combustion air supply bends on both sides of the boiler. A ventilation valve is added to the three-way pipe. In the event of a power outage, the ventilation valve opens, allowing outdoor air to quickly enter the air chamber to cool the hot chain grate, preventing prolonged high-temperature damage. This solves the technical problem in related technologies where the combustion air supply stops during a power outage, easily leading to prolonged excessively high grate temperatures, reduced service life, or even damage. Furthermore, unlike traditional systems where each combustion air duct has an individual valve for control, this device uses unified control, eliminating the need for individual valves on each duct. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a grate induced draft device in the prior art;

[0014] Figure 2 A schematic diagram of the structure of an emergency ventilation device for a grate provided in an embodiment of this utility model.

[0015] Figure 3 This is a structural schematic diagram of the connection method between the flap and the connecting shaft in an emergency ventilation device for a grate provided in this embodiment of the utility model.

[0016] In the picture:

[0017] 1-Grate; 2-Furnace chamber; 3-Coal bed; 4-Air chamber; 5-Elbow pipe; 6-Induced draft fan; 7-T-pipe; 8-First pipe opening; 9-Second pipe opening; 10-Third pipe opening; 11-Ventilation valve; 12-Flip plate; 13-Connecting shaft. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] This utility model provides an emergency ventilation device for a grate, including a grate 1, which is located below the furnace 2. Above the grate 1 is the coal bed 3 of a coal-fired boiler. Below the grate 1 is a wind chamber 4 for ventilation into the furnace 2 and an induced draft device connected to the wind chamber 4.

[0020] In the prior art, the exhaust fan only has the function of introducing combustion-supporting fresh air. It includes multiple 90° elbow pipes 5 arranged at intervals along the length of the air chamber 4. One end of the pipe is connected to the air chamber 4, and the other end is connected to the exhaust fan 6. Each pipe has a flap to control the connection and disconnection between the pipe and the air chamber.

[0021] In this embodiment, the induced draft device includes a three-way pipe 7, the first pipe port 8 of the three-way pipe 7 is connected to the air chamber 4; the second pipe port 9 of the three-way pipe 7 is connected to the induced draft fan 6 for introducing combustion-supporting fresh air; the third pipe port 10 of the three-way pipe 7 is provided with a ventilation valve 11 for opening when the fan stops working during a power outage, so that outdoor air enters the induced draft device through the third pipe port, and then enters the air chamber 4 through the first pipe 8, thereby reducing the temperature of the grate and preventing damage from prolonged heating.

[0022] Multiple three-way pipes 7 are spaced apart along the length of the air chamber 4. In each three-way pipe 7, a flap 12 for controlling the introduction and blocking of combustion-supporting fresh air is provided on the pipe passage from the second pipe opening 9 to the first pipe opening 8. Each flap 12 is connected by a unified connecting shaft 13. For example, the flap 12 is located near the second pipe opening 9. The connecting shaft 13 passes horizontally through each three-way pipe 7 along the length of the air chamber 4 and is connected to the flap 12 in each three-way pipe 7. In this way, only the connecting shaft 13 needs to be rotated to control the rotation of all flaps 12 simultaneously. The flap 12 can be set such that when it is rotated to a state where the flap surface is parallel to the pipe cross-section, it blocks the airflow in the pipe, and when it is rotated to a state where it is perpendicular to the pipe cross-section, it allows the airflow in the pipe.

[0023] In this embodiment, in the three-way pipe 7, the first pipe opening 8 and the third pipe opening 10 are coaxially arranged, and the second pipe opening 9 is perpendicularly intersecting the axes of the first pipe opening 8 and the third pipe opening 10. In this way, from the perspective of air flow direction, outdoor air can flow into the air chamber in a horizontal direction, which is closer to the natural flow direction of most outdoor air and helps to reduce the temperature of the grate.

[0024] Optionally, a three-way pipe 7 is provided on both sides of the air chamber 4 to increase the combustion efficiency of fresh air and the cooling efficiency of outdoor air.

[0025] Optionally, grate 1 is a chain grate.

[0026] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A stoker emergency ventilation device, characterized in that The invention relates to a boiler, which comprises a grate, an air chamber arranged below the grate, and an air induction device connected to the air chamber; The air induction device comprises a tee pipe, the first pipe opening of which is communicated with the air chamber; the second pipe opening of the tee pipe is connected to a fan for introducing combustion-supporting fresh air; the third pipe opening of the tee pipe is provided with a ventilation valve for opening in case of power failure, so that outdoor air enters the air induction device through the third pipe opening, and then enters the air chamber through the first pipe; a plurality of tee pipes are arranged along the length direction of the air chamber, and in each tee pipe, a flap for controlling the introduction and blockage of combustion-supporting fresh air is arranged on the pipe passage from the second pipe opening to the first pipe opening, and the flaps are connected by a unified connecting shaft.

2. The fire grate emergency ventilation device according to claim 1, characterized in that In the tee pipe, the first pipe opening is coaxially arranged with the third pipe opening, and the second pipe opening is perpendicularly intersected with the axes of the first pipe opening and the third pipe opening.

3. The fire grate emergency ventilation device of claim 1, wherein, The air chamber is provided with the tee pipes on both sides.

4. The fire grate emergency venting device of claim 1, wherein, The grate is a chain grate.

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