waste heat boiler/steam/hot water/air preheater

Product details

The air preheater, also referred to as the air preheater, is a kind of preheating equipment that improves the heat exchange performance of the boiler and reduces the heat loss. The function of the air preheater is to conduct the heat carried in the flue gas discharged from the flue at the tail of the boiler to the air before entering the boiler through the heat sink, and preheat the air to a certain temperature.

Generally referred to as the air preprocessor. Mostly used for coal-fired power station boilers. It can be divided into two types: tube box type and rotary type. Among them, rotary type is divided into two types: hood rotary type and heating surface rotary type. Power station boilers often use heating surface rotary preheaters. The application in boilers is generally two-silo, three-silo, and four-silo, among which the four-silo is more commonly used in circulating fluidized bed boilers .

working principle

1. Take the rotary air preheater as an example to illustrate the principle of the air preheater. During operation, it will rotate slowly, and the flue gas will enter the flue gas side of the air preheater and then be discharged, and the heat carried in the flue gas will be discharged. It will be absorbed by the heat sink in the air preheater, then the air preheater rotates slowly, the heat sink moves to the air side, and then transfers the heat to the air before entering the boiler.

2. The application of air preheaters in boilers is mostly three-silo type, with a fire alarm system, a gap adjustment system and a frequency conversion control system. The air preheater is easy to use, simple to operate, safe to operate, and can improve the heat exchange performance of the boiler system, so it is widely used in the flue gas boiler system.

effect

1. Improve and strengthen combustion
The air after passing through the waste heat exchanger enters the furnace, which accelerates the drying, ignition and combustion process of the fuel, ensures the stable combustion in the boiler, and improves the combustion efficiency .

2. Enhance heat transfer
Because the combustion in the furnace has been improved and strengthened, and the temperature of the hot air entering the furnace has been increased, the average temperature level in the furnace has also been increased, which can strengthen the radiation heat transfer in the furnace.

3. Reduce the loss in the furnace, reduce the exhaust gas temperature, and improve the thermal efficiency of the boiler
Due to the stable combustion in the furnace and the strengthening of radiant heat exchange, the chemical incomplete combustion loss can be reduced; on the other hand, the air preheater uses the waste heat of the flue gas to further reduce the exhaust gas loss, thus improving the thermal efficiency of the boiler. According to experience, when the air is raised by 1.5°C in the preheater, the exhaust gas temperature can be reduced by 1°C. After installing the air preheater in the boiler flue, if the residual heat of the air can be reduced to 150-160°C, the exhaust gas temperature can be reduced. 110-120℃, the boiler thermal efficiency can be increased by 7%-7.5%. It can save fuel by 11%-12%.

4. Hot air can be used as fuel desiccant
For layer-fired furnaces, hot air can use fuels with higher moisture and ash content. For power station boilers , hot air is an important desiccant and pulverized coal conveying medium in the pulverizing system.

Product parameters

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