How does a boiler deaerator regulate oxygen content and improve combustion efficiency?

A boiler is a thermal energy conversion device used to heat water into steam that generates heat or energy. During boiler operation, oxygen is inevitable, but its high content can have a negative impact on combustion efficiency. In order to improve the combustion efficiency of the boiler, it is necessary to use a deoxidizer to adjust the oxygen content. Boiler deoxidizer is a chemical substance used to remove dissolved oxygen from boiler water. By adding deoxidizers, the oxygen content in boiler water can be effectively reduced, thereby improving combustion efficiency. Below, we will provide a detailed explanation on how to adjust the oxygen content to improve the combustion efficiency of the boiler.

Firstly, adjusting the oxygen content in boiler water is the key to improving combustion efficiency. Under normal conditions, the oxygen content in boiler water should be controlled below 0.005 milligrams per liter. During the operation of the boiler, water and fuel exchange heat in the boiler chamber, and oxygen and fuel oxidize to form gas and solid oxides. These oxides adhere to the internal surface of the boiler, forming coke and causing boiler corrosion.

Physical and chemical methods can be used to reduce the oxygen content in boilers.

The physical methods mainly include ventilation and air conditioning. By increasing the ventilation and ventilation time of the boiler, the indoor oxygen content can be reduced to a reasonable level. However, this method is not sufficient to control the oxygen content.

Chemical methods are widely used to control the oxygen content in deoxidizers. The most common chemical deoxidizers are sulfite, sulfite, and reducing agents. These chemical oxygen scavengers can react chemically with oxygen in water, converting it into harmless gases that remove oxygen. At the same time, these deaerators also have the function of preventing corrosion and purifying boiler water.

The selection of deoxidizer should take into account the characteristics of the boiler. Generally speaking, sulfite deaerators are suitable for high-pressure and ultra-high pressure boilers, sulfite deaerators are suitable for medium pressure boilers, and reducing agents are suitable for low-pressure boilers. In addition, the intake of the deaerator also needs to be appropriately controlled to achieve the deaeration effect.

The discharge deaerator is a key step in improving the combustion efficiency of boilers. An appropriate dosage of deaerator can effectively reduce the oxygen content in boiler water and improve combustion efficiency. The usual method of administration is to add deoxidizer to boiler water in an appropriate proportion, and then evenly distribute the deoxidizer throughout the entire boiler system using a circulation pump.

In addition, the administration time and frequency also need to be reasonably controlled. Normally, the deaerator must be introduced 30 minutes before the boiler starts. During the normal operation of the boiler, the deoxidizer should be regularly inspected and replenished to ensure its effectiveness.

Another important aspect of using deoxidizers is their corrosive effect on boiler systems. Excessive use of antioxidants can lead to corrosion of metal materials in boiler systems, while too little use of antioxidants cannot achieve anaerobic purposes. Therefore, the number and frequency of deaerators used depend on the specific state and water quality characteristics of the boiler.