Sulfur Recovery Daily Question 2019.1.20
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What are the causes of boiler scaling? Answer: Boiler scaling occurs primarily due to calcium and magnesium hardness in the feed water, or high levels of iron ions and silicon ； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed, and some of this sludge is sticky; if it is not removed promptly through drainage, it can also turn into scale.
Firstly, it is because the water supply contains calcium and magnesium hardness, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed, and some of this sludge is sticky; if it is not removed promptly through drainage, it can also turn into scale.
Firstly, it is because the water supply contains calcium and magnesium hardness, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed, and some of this sludge is sticky; if it is not removed promptly through drainage, it can also turn into scale.
Firstly, it is because the water supply contains calcium and magnesium hardness, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed; some of this sludge is sticky, and if it is not removed promptly through drainage, it can also turn into scale
Boiler scaling occurs first and foremost due to calcium and magnesium hardness in the feed water, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed, and some of this sludge is sticky; if it is not removed promptly through drainage, it can also turn into scale.
Firstly, it is because the water supply contains calcium and magnesium hardness, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed, and some of this sludge is sticky; if it is not removed promptly through drainage, it can also turn into scale.
1. Boiler scaling is primarily caused by high levels of calcium, magnesium, iron ions, or silicon in the feed water； 2. Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main causes of scale formation.
Boiler scaling occurs first and foremost due to calcium and magnesium hardness in the feed water, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed, and some of this sludge is sticky; if it is not removed promptly through drainage, it can also turn into scale.
Boiler scaling occurs first and foremost due to calcium and magnesium hardness in the feed water, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main causes of scale formation.
Firstly, it is because the water supply contains calcium and magnesium hardness, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed, and some of this sludge is sticky; if it is not removed promptly through drainage, it can also turn into scale.
Firstly, it is because the water supply contains calcium and magnesium hardness, or high levels of iron ions and silicon； Secondly, it is caused by the special conditions of high temperature and high pressure in the boiler. The main reasons for scale formation are as follows: ① Thermal decomposition: Under high temperature and pressure, certain calcium and magnesium salts that were originally dissolved in water (such as bicarbonates) undergo thermal decomposition, turning into insoluble substances that precipitate out (such as carbonates). ②Decreased solubility: Under high temperature and pressure, the solubility of certain salts (such as calcium sulfate, silicates, etc.) **decreases** as the temperature rises; once it reaches a certain level, precipitation occurs. ③Evaporation and concentration of water: Under high temperature and pressure, as the water in the boiler continues to evaporate and concentrate, the concentration of salts in the water increases accordingly. When supersaturation is reached, precipitates form on the evaporation surface. ④Interactions and transformations: Salts with high solubility in the feed water react with other salts under the operating conditions of the boiler, resulting in the formation of insoluble precipitates; if these reactions occur on the heating surfaces, scale is formed directly ； If the reaction takes place in boiling water, sludge is formed; some of this sludge is sticky, and if it is not removed promptly through drainage, it can also turn into scale