What is the working principle and classification of boiler grate? What are the potential safety hazards in the operation of boiler grate?

Feb 23,2023


The boiler grate refers to the part of the boiler that accumulates solid fuel and makes it burn effectively. It consists of grate frame and grate plate, and is usually cast with cast iron. After assembly, there should be a ventilation gap between the components. A ventilation chamber with adjustable air volume is usually set under the grille to allow air to enter the fuel layer through the gap. The burned ash can be discharged manually or mechanically. What is the working principle of boiler grate? What are the potential safety hazards in the operation of boiler grate? Let's introduce:

1、 Working principle of boiler grate

1. The boiler grate is a horizontal three-return water-fire tube hybrid boiler. A bundle of threaded smoke tubes is installed in the steam drum. Light tube water-cooled walls are installed on the left and right sides of the furnace. Light chain grate is used for mechanical coal feeding, equipped with blower and induced draft fan for mechanical ventilation, and equipped with scraper slag extractor for automatic slag removal. The front and rear arch of boiler grate adopts new energy-saving technology. After the fuel falls from the coal hopper to the grate and enters the furnace for combustion, the flame refracts through the rear arch, turns upward through the combustion chambers on both sides of the main body to the front smoke box, then turns back to the tube bundle in the boiler through the front smoke box, enters the economizer through the rear smoke box, and is pumped to the chimney through the flue pump by the induced draft fan and discharged into the atmosphere.

2. The boiler grate can be classified according to different methods. Boilers can be divided into industrial boilers, power station boilers, marine boilers and locomotive boilers according to their purposes. According to the boiler outlet pressure, it can be divided into low pressure, medium pressure, high pressure, high pressure, subcritical and supercritical pressure boilers.

4. According to the circulation mode, it can be divided into natural circulation boiler, auxiliary circulation boiler, once-through boiler and composite circulation boiler. The boiler is divided into chamber combustion furnace, layer combustion furnace and fluidized bed furnace according to the combustion mode.

2、 Potential safety hazards during operation of boiler grate

1. High temperature, dust, noise and hot slag temperature may cause burning and scalding.

2. When the boiler is running, it will not only bear certain temperature and pressure, but also be subject to medium erosion and fly ash wear, and there is an explosion risk.

3. When the boiler is running, it not only bears certain temperature and pressure, but also is subject to medium erosion and fly ash wear, so there is an explosion risk.

4. If the boiler has defects in the process of design, manufacture and installation, or is poorly maintained or out of repair for a long time, or is poorly managed or in violation of operating procedures, equipment accidents may occur, resulting in production reduction, production suspension or affecting product quality; In serious cases, explosion accidents may occur, causing huge losses to people's lives and national property.

3、 Main reasons for unstable load caused by boiler grate:

1. Whether the coal particle size is within the specified range. If the coal particle is too large, it will affect the normal fluidization of the boiler and cause combustion instability.

2. The lower thickness of the material layer makes it difficult to control the load.

3. Whether the returned materials are normal. Because of continuous reflux, this anomaly will affect the stability of bed temperature.

4. Whether the coal feeding is normal. If the humidity of coal is too high, it may lead to uneven coal feeding and abnormal furnace temperature.

5. Whether all measuring instruments are normal. Please check and handle the boiler according to the above points. The stable operation of the boiler should be controllable.

What are the types of boiler grate?

The boiler grate is a part of the boiler or industrial furnace, which is used to contain solid fuel and effectively burn solid fuel. The whole grate mainly consists of two parts: frame and grate plate.

What is the basic knowledge of boiler grate?

There are many types of boiler grates, and grids of various shapes can be divided into inclined type and inclined type according to common plug-in type; According to the movement deviation of coal on the grate, it is opposite to the forward direction.

What are the components of small waste incinerator waste incinerator grate

The primary combustion chamber, secondary combustion chamber, cyclone dust removal equipment, chimney, flue, pipe system software, high pressure fan, auxiliary pressure fan, primary combustion engine, secondary combustion engine, electrical cabinet, temperature display equipment, detection system, etc.
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