Shanxian Chemical
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Ammonia in Boiler Water Treatment
On the Application of Ammonia in Boiler Water Treatment
1. INTRODUCTION
Water is a key element of boiler operation, and the quality of water quality is directly related to the safe and efficient operation of the boiler. As an important chemical substance, ammonia plays a pivotal role in the field of boiler water treatment. Clarifying the application principle, efficacy and related precautions of ammonia in boiler water treatment is of great significance to ensure the stable operation of the boiler.
2. The principle of ammonia in boiler water treatment
1. ** Adjusting the pH value **
The appropriate pH value of boiler water is extremely critical to prevent metal corrosion. When ammonia is dissolved in water, the following reactions occur: $NH_ {3} + H_ {2} O\ rightleftharpoons NH_ {4} ^ {+} + OH ^ {-} $, the generated hydroxide ions can raise the pH of the water. Generally speaking, the pH value of boiler water should be maintained between 9-11. The addition of ammonia can effectively adjust this pH range, thereby reducing the corrosion of acidic substances in water on the metal surface of the boiler.
2. ** Removal of dissolved oxygen in water **
Ammonia can chemically react with dissolved oxygen in water to remove dissolved oxygen. Although the reaction process is more complicated, it can be roughly understood as the reaction of ammonia and oxygen under certain conditions to reduce the content of dissolved oxygen in the water. Dissolved oxygen is one of the important factors leading to boiler metal corrosion, and the removal of dissolved oxygen can greatly slow down the corrosion process.
Third, the specific application of ammonia in boiler water treatment
1. ** Dosing method **
Usually, continuous dosing is used to slowly inject the ammonia solution into the boiler water system. This method can ensure that the concentration of ammonia in the boiler water remains relatively stable, and then continue to play the role of adjusting the pH value and removing dissolved oxygen. The dosing point is generally selected in the boiler water inlet pipe or after the oxygen remover to ensure that the ammonia can be quickly mixed with the water.
2. ** Concentration Control **
It is essential to accurately control the concentration of ammonia in boiler water. If the concentration is too low, it is difficult to achieve the expected treatment effect, and it is impossible to effectively adjust the pH value and remove dissolved oxygen; if the concentration is too high, it may cause problems such as alkaline corrosion. In actual operation, the appropriate ammonia concentration should be determined through testing and monitoring according to the type, water quality and operating parameters of the boiler. Generally speaking, the mass concentration of ammonia in boiler water is usually controlled between a few milligrams per liter and tens of milligrams per liter.
IV. Precautions for applying ammonia for boiler water treatment
1. ** Monitoring and Adjustment **
It is necessary to monitor the pH value, ammonia concentration, dissolved oxygen content and other key indicators of boiler water in real time. By regularly analyzing the detection data and adjusting the dosage of ammonia in time, it is necessary to ensure that the indicators of boiler water are always within a reasonable range. At the same time, attention should be paid to changes in boiler operating conditions, such as load changes, water quality fluctuations, etc., and make corresponding adjustments in a timely manner.
2. ** Equipment Material Compatibility **
Ammonia may react chemically with some metal materials, causing corrosion to the equipment. When selecting equipment materials in contact with ammonia, its ammonia corrosion resistance should be fully considered. For example, some copper alloy materials are prone to complexation reactions with ammonia, resulting in corrosion, so they are not suitable for use in ammonia treatment systems. Suitable stainless steel, carbon steel and other materials should be selected, and anti-corrosion measures should be taken.
Fifth, Conclusion
Ammonia plays an important role in ensuring the safe and efficient operation of boilers by virtue of its characteristics of adjusting pH value and removing dissolved oxygen in boiler water treatment. In practical applications, through reasonable dosing methods, precise concentration control, and close attention to various precautions, the advantages of ammonia in boiler water treatment can be fully exerted, the service life of boilers can be extended, and energy efficiency can be improved.
1. INTRODUCTION
Water is a key element of boiler operation, and the quality of water quality is directly related to the safe and efficient operation of the boiler. As an important chemical substance, ammonia plays a pivotal role in the field of boiler water treatment. Clarifying the application principle, efficacy and related precautions of ammonia in boiler water treatment is of great significance to ensure the stable operation of the boiler.
2. The principle of ammonia in boiler water treatment
1. ** Adjusting the pH value **
The appropriate pH value of boiler water is extremely critical to prevent metal corrosion. When ammonia is dissolved in water, the following reactions occur: $NH_ {3} + H_ {2} O\ rightleftharpoons NH_ {4} ^ {+} + OH ^ {-} $, the generated hydroxide ions can raise the pH of the water. Generally speaking, the pH value of boiler water should be maintained between 9-11. The addition of ammonia can effectively adjust this pH range, thereby reducing the corrosion of acidic substances in water on the metal surface of the boiler.
2. ** Removal of dissolved oxygen in water **
Ammonia can chemically react with dissolved oxygen in water to remove dissolved oxygen. Although the reaction process is more complicated, it can be roughly understood as the reaction of ammonia and oxygen under certain conditions to reduce the content of dissolved oxygen in the water. Dissolved oxygen is one of the important factors leading to boiler metal corrosion, and the removal of dissolved oxygen can greatly slow down the corrosion process.
Third, the specific application of ammonia in boiler water treatment
1. ** Dosing method **
Usually, continuous dosing is used to slowly inject the ammonia solution into the boiler water system. This method can ensure that the concentration of ammonia in the boiler water remains relatively stable, and then continue to play the role of adjusting the pH value and removing dissolved oxygen. The dosing point is generally selected in the boiler water inlet pipe or after the oxygen remover to ensure that the ammonia can be quickly mixed with the water.
2. ** Concentration Control **
It is essential to accurately control the concentration of ammonia in boiler water. If the concentration is too low, it is difficult to achieve the expected treatment effect, and it is impossible to effectively adjust the pH value and remove dissolved oxygen; if the concentration is too high, it may cause problems such as alkaline corrosion. In actual operation, the appropriate ammonia concentration should be determined through testing and monitoring according to the type, water quality and operating parameters of the boiler. Generally speaking, the mass concentration of ammonia in boiler water is usually controlled between a few milligrams per liter and tens of milligrams per liter.
IV. Precautions for applying ammonia for boiler water treatment
1. ** Monitoring and Adjustment **
It is necessary to monitor the pH value, ammonia concentration, dissolved oxygen content and other key indicators of boiler water in real time. By regularly analyzing the detection data and adjusting the dosage of ammonia in time, it is necessary to ensure that the indicators of boiler water are always within a reasonable range. At the same time, attention should be paid to changes in boiler operating conditions, such as load changes, water quality fluctuations, etc., and make corresponding adjustments in a timely manner.
2. ** Equipment Material Compatibility **
Ammonia may react chemically with some metal materials, causing corrosion to the equipment. When selecting equipment materials in contact with ammonia, its ammonia corrosion resistance should be fully considered. For example, some copper alloy materials are prone to complexation reactions with ammonia, resulting in corrosion, so they are not suitable for use in ammonia treatment systems. Suitable stainless steel, carbon steel and other materials should be selected, and anti-corrosion measures should be taken.
Fifth, Conclusion
Ammonia plays an important role in ensuring the safe and efficient operation of boilers by virtue of its characteristics of adjusting pH value and removing dissolved oxygen in boiler water treatment. In practical applications, through reasonable dosing methods, precise concentration control, and close attention to various precautions, the advantages of ammonia in boiler water treatment can be fully exerted, the service life of boilers can be extended, and energy efficiency can be improved.
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