How to maintain and repair the pulverized coal burner?

How to maintain and repair the pulverized coal burner?
5 min read
08 February 2023

How to Maintain and Repair the Pulverized Coal Burner

When it comes to pulverized coal burners, there are several things you need to consider in order to keep them functioning at their best like burner. Some of the things you need to watch for include alkalis, regurgitation, fly ash particles, and filter housings.

Alkalis

Various factors play a vital role in the efficient use of low-rank coal. For example, the grindability of the coal and the moisture content of the coal affect the product fineness and the power consumption. The pulverized coal particle devolatilization and the alkali metal release in the combustion process are two major concerns. These problems can jeopardize the safe operation of coal-fired power stations.

Alkali metal species are a significant pollutant that causes fouling of boilers. Moreover, these species can also contribute to environmental pollution. Hence, technologies must be developed to suppress these harmful species during the combustion process. In addition, effective technologies are needed to maintain the safety of the boiler.

In the present study, a novel multi-filter technique is used to determine the volatile release of alkalis and to study the reaction and emission process. The results of the study demonstrate the importance of alkalis in BFs and HMs.

The ash from injected coal serves as a main deliverer of undesirable alkalis. This alkali acts as an inhibitor for the oxidizing process. It can also influence permeability in the lower zone. In the deadman zone, this alkali condenses. This build-up of alkalis can also lead to HM flow problems.

Filter housings

One of the most important parts of a pulverized coal fired boiler is the coal pulverizer. Problems with pulverizers can lead to explosions and failures of the boiler feed system.

The pulverizer grinds the coal into fine dust. This dust expands the coal's surface area, allowing it to burn hotter. The pulverized coal powder is then blown into the burner of the boiler.

Several factors affect the efficient operation of a coal pulverizer. Some of these include capacity, fuel supply and fineness, and lubrication. Identifying these issues will help you ensure that your pulverizer is operating as efficiently as possible.

One of the most common causes of poor pulverizer performance is high primary air flow rates for Combustion Control Systems. Proper air flow rate measurement is vital to maintaining a uniform distribution of fuel at the outlet of the classifier. The correct rate can be calculated using the air-heat equivalent method. However, the quality of the coal is not considered in this calculation.

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Fly ash particles

Coal fly ash is produced when pulverized coal is burned in a thermal power plant. It is a fine, light-coloured glass-like powder. It is often used in concrete mixes as a pozzolanic additive. In addition to being a source of alumina and silica, it is also a substitute for ferrous.

During combustion, a variety of chemical compounds and additives are added to the pulverized coal. The chemical composition of the coal can have an impact on the fly ash particle size distribution. This is important for determining the adsorption potential of the ash. The amount of carbon and Hg in the ash are also important for understanding the adsorption properties of fly ash.

Unburnt carbon particles are found in the coal-derived fly ash. These particles are generally comprised of submicron aggregated char particles. Depending on the boiler conditions and the surface chemistry, these unburnt carbons can contribute to the capture of mercury.

While the majority of the chars are derived from vitrinite macerals in low-rank coal, there are also other isotropic chars, such as anthracite-derived carbons. The adsorption properties of the fly ash are dependent on the amount of unburnt carbon, the size distribution, the char surface chemistry, the temperature of the coal, and the residence time.

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Regurgitation

The pulverized coal burner is a key piece of equipment in the pulverized coal-fueled boiler. Its performance is critical to the efficiency of the furnace. Therefore, it is important to maintain and repair it properly for coke oven gas burner.

Problems with a pulverized coal burner include capacity issues, slagging, and reliability. These can affect the overall availability of the plant. When they occur, they can lead to high fuel costs and increased pollutant emissions. In addition, they can result in explosions in the boiler feed system.

The main factors that impact the pulverizer's performance include the throat velocity, the amount of fuel fineness, and the coal feed rate. The throat velocity must be within design specifications to produce the desired air-fuel ratio. In order to achieve the best A/F ratio, it is essential to ensure that the pulverizer is performing within the stoichiometric equation. This can be accomplished by measuring the flow of pulverized coal and fuel gas through the nozzle.

In order to maintain a balance between fuel and airflow, fuel line orifice housings should be installed. These can be a valuable diagnostic tool for determining combustion issues. In addition, they can speed up testing and balancing efforts.

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