How to judge the scaling of the boiler and what are the causes of the scaling?

2 tons of boiler electrodialysis? Smell a rat. Water treatment equipment is more expensive than boilers.

Plus ion exchange? Then your effluent is ultra-pure water, may I ask, if the effluent indicators are qualified, how can scale be generated? Is it necessary to remove limescale?

Power plant boilers require descaling, and 2-ton industrial boilers are not necessary. If you have been giving water to the qualified and the pot is reasonable, it can be said that the thickness of the scale will not exceed for 2 years. Besides, the existing ** descaler will not be able to get rid of the scale you may produce.

Who is the recommended answer? Mistaken people. After electrodialysis and ion exchange, ** and chloride ions, what else is chloride measured?

You can compare the exhaust temperature, if it is 50% higher than when it was first installed, it means that the scale or the smoke scale is relatively large, but if you have been purifying it with resin, it is generally no problem, you can test the resin, if the resin is normal, it will be fine, because after the water is softened by the resin, there will be no scale.

No matter how tight the production is, you must also have the boiler inspected regularly.

To check the scale inside the boiler, you have to stop the furnace, open the manhole door, go in and check.

The boiler usually operates, and maintenance is very important, so don't ignore it.

Prevent fouling: pay attention to the first pass of water quality treatment, and strictly implement the sewage discharge system for boiler operators.

The specific method is in accordance with the operating procedures. The operating procedures of the boiler are very important, and they should be operated according to the regulations.

If the fuel consumption and exhaust gas temperature are higher than before, it will indicate that there will be electrical problems, but it cannot fully explain the fouling, and the soot may affect the efficiency and reduce the efficiency.

I asked the master, and he said that he could test the root of the stove, but I didn't know the exact steps.

I think the best thing to do is to shut down the furnace and tear down the manhole and go in and get rid of a piece of limescale.

No chance of furnace downtime throughout the year?

Stop the furnace and open the hand hole and manhole to check it.

I have an automatic descaling boiler. Take a look at my space.

1. Thermal decomposition.

Under high temperature and high pressure, some calcium and magnesium salts (such as bicarbonate) that were originally soluble in water are decomposed by heat and become insoluble substances and precipitate.

2. Solubility decreases.

Under high temperature and high pressure, the solubility of some salts (such as calcium sulfate, silicate, etc.) decreases greatly with the increase of temperature, and after reaching a certain level, it will precipitate.

3. Evaporate and concentrate the water in the pot.

Under high temperature and high pressure, the concentration of salts in the pot water will continue to increase with evaporation and concentration, and when it reaches supersaturation, it will precipitate on the heating surface.

4. Mutual reaction and transformation.

The salts that were originally more soluble in the feed water reacted with other salts during operation to form insoluble precipitates. If the reaction occurs on the heating surface, scale is directly formed; If the reaction occurs in the pot water, slag is formed. Some of the slag is sticky, and when it is not removed by the sewage in time, it will be converted into scale.

In addition, some corrosion products adhere to the heating surface and are often easily converted into metal oxide scale.

For a company that has specialized in industrial water descaling for more than a decade, the question is somewhat simple:

1.Water quality problems: Water contains a large number of dissolved salts, hardness substances and alkaline substances, which is easy to form scale. Therefore, water quality has a great impact on the occurrence of boiler fouling problems.

2.Water temperature problem: When the water temperature rises, the dissolved salts and hardness substances in it will become unstable and easy to form scale.

3.Oxidation problem: When the water contains oxygen, it is easy to cause oxidation reaction on the surface of the steel, resulting in the formation of rust and oxides, which will form a thin film on the inner wall of the boiler, which is also one of the causes of boiler scaling.

4.Water velocity in the boiler: When the water velocity in the boiler is too low, the impurities and hardness substances in the water will precipitate on the inner wall of the boiler and form scaling.

The causes of boiler fouling involve many aspects such as water quality, water temperature, oxidation and water flow velocity. In order to avoid the occurrence of boiler fouling problems, we need to pay attention to the management of water quality, regularly clean and maintain the boiler, and ensure that the water flow rate and water temperature are stable.

Many of our customers have installed magnetic shock descalers and the scaling problem of the boiler has been greatly improved.

There are many factors for industrial boiler scaling, one is whether the boiler is equipped with corresponding water treatment equipment. Second, whether the water quality of the boiler in operation is regularly tested according to the requirements of the boiler water quality standards. Third, according to the boiler water quality test results, whether the boiler is regularly discharged.

As long as the above three requirements are done, the boiler will not have the problem of scaling, among which the boiler water quality testing technology is related to whether the boiler water quality index is qualified, and it is also an important indicator related to whether the boiler is scaling. Yijie water quality.

Boiler scale treatment can reduce the generation of scale and remove scale through two methods: boiler external water treatment and boiler internal water treatment, and reduce the potential harm of scale to the boiler.

1.Outside the pot water treatment--- lime + soda ash softening method.

This method is suitable for a wide range of boilers. At present, the lime + soda ash softening method has a reliable effect on the water treatment outside the pot, which is to add an appropriate amount of quicklime and soda ash to the clarified water to achieve the purpose of softening. There are two kinds of lime + soda ash softening methods: cold method and hot method.

The cold method is carried out at room temperature to reduce the residual hardness in the water to 1 5 2 mg equivalent liters. The thermal method is to heat the water temperature to 20 80 to reduce the residual hardness in the water to 0 3 0 4 mg equivalent liters.

Therefore, the thermal method should be used as much as possible to improve the softening effect. The ion exchange softening method mainly relies on the exchange resin in the sodium ion exchanger for softening. Due to the strong adsorption capacity of the exchange resin, it can adsorb calcium and magnesium ions free in the water, so that the hardness of the boiler feed water can meet the qualified standard.

There are two types of ion exchangers: inorganic and organic. Inorganic exchange resins can only be used for surface exchange, and the softening effect is poor, so it is used less. However, the characteristics of organic exchange resin are that the core structure of the particles is loose, and the exchange reaction can be carried out on the surface and inside of the particles at the same time, and the softening effect is good, so it is used more.

2.Chemical reagents are added --- the water treatment in the pot.

This method is mainly to add chemicals to the furnace water, and form loose sediment with calcium and magnesium salts that form scale in the furnace water, and then discharge the sediment out of the furnace by the method of sewage discharge, which plays a role in preventing (or reducing) boiler fouling. Furnace dosing treatment is generally used for small low-pressure fire-tube boilers.

The commonly used drugs for water treatment in the pot are: trisodium phosphate, sodium carbonate (soda ash), sodium hydroxide (caustic soda, also known as caustic soda) and organic colloids (tannin gum).

When dosing, various drugs should first be prepared into a solution and then added to the boiler. Usually the solution concentration of trisodium phosphate is 5 8%, the solution concentration of sodium carbonate is not more than 5%, and the concentration of sodium hydroxide is not more than 1 2%. There are two types of dosing methods: regular and continuous.

Regular dosing mainly relies on dosing cans for dosing; Continuous dosing is to continuously add the drug to the feed water before the water supply equipment. For steam boilers, it is best to use the continuous dosing method, which can keep the liquid uniform in the furnace. Where the water in the pot is treated, the boiler sewage should be strengthened, so that the formed sludge and dirt are discharged out of the furnace and receive better results.

The boiler water treatment equipped by our company is a computer-controlled automatic water softener device (such as Atuzu, Fulek). Its advantages are high degree of automation, large working exchange capacity, low salt consumption, low power consumption, reasonable structure, easy installation, stable and reliable performance, completely avoid the interference of human factors, the whole set of equipment structure is light, strong and anti-corrosion, and the control part can also be transformed with traditional manual equipment to achieve automation.

If there is a problem with water quality, the boiler will generally be scaled, and the alkali will be used regularly to remove the dirt, otherwise it will become thicker and thicker.

It is mainly related to the water quality used, and then it is related to the timely sewage operation process during the normal operation of the boiler, which can refer to the operation regulations.

The reason for boiler fouling is first of all that the feed water contains calcium-magnesium hardness or iron ions, and the silicon content is too high; At the same time, due to the special conditions of high temperature and high pressure of the boiler. If the hardness of the water enters the boiler without treatment, after a period of operation, some solid deposits will be firmly attached to the heating surface of the boiler water side, which is called scaling. The solid deposits that adhere to the heated surface are called scale.

Under certain conditions, the solid precipitate will also precipitate in the pot water and appear in a loose suspension form, which is called water residue. The slag can be removed with the drainage, but if the sewage is not discharged in time, some of the slag will also be deposited on the heating surface or the part where the water flow is sluggish and converted into scale (often called "secondary scale").

The fouling in the pot barrel and the heating pipe is usually caused by the high salt content of the furnace water, usually the scale component is Ca salt (low solubility), the specific index is to see the conductivity, in addition to prevent corrosion, also pay attention to the control of dissolved oxygen content and pH value.

During operation, pay attention to regular sewage discharge, continuous sewage discharge, and dosing work as required. In addition, it is necessary to strengthen the detection of the alkalinity of the furnace water.

The main cause of boiler fouling is the high content of calcium ions and magnesium ions in the raw water, which will adhere to the inner wall of the boiler in the environment of high temperature and high pressure of the boiler, which is often referred to as scaling. The purpose of Junhao environmental protection boiler softened water equipment is to solve the problem of excessive calcium and magnesium ions in the water, which can not only improve the water output of the boiler, but also protect the safety and stability of the boiler.

Boiler fouling is due to the high hardness of water, and it is enough to reduce the hardness of water with water softening equipment.

(1) The main reason for boiler fouling is that the water quality is too hard, and a large amount of calcium, sodium, magnesium and other ions are deposited and condensed on the metal surface of the boiler after long-term use. The method of expulsion is first from the water quality treatment, and then the furnace is washed. It is best to ask a professional to do the specific work.

2) Boiler scaling is mainly due to the influence of water quality, tap water belongs to hard water, because hard water is water containing more soluble calcium, magnesium substances, after heating, these soluble calcium and magnesium substances are converted into insoluble substances, precipitation impurities are more hard water, the more impurities, the greater the hardness of the water, the higher the hardness, the easier it is to form scale. Excessive scale accumulation will affect thermal efficiency, increase heat loss, and increase energy consumption. The method of scale removal is mainly to add medicine to remove scale, according to the amount of water per ton of sodium hydroxide and trisodium phosphate each kilogram of cooking furnace.

Of course, according to the requirements of heat gauge and steaming gauge, it is best to put on a set of demineralized water, the cost of scale energy consumption is much higher than the cost of demineralized water, and the boiler will be used in the future to add a set of demineralized water, and now it is to add medicine to remove scale.

3) Formation of scale:

1.After the water containing temporary hardness enters the boiler, during the heating process, some calcium and magnesium salts are decomposed by heat, transforming from water-soluble substances to water-insoluble substances, which adhere to the metal surface of the boiler and form scale.

2.Some salts exceed their solubility due to the continuous evaporation and concentration of pot water, the content of dissolved salts in the water continues to increase, when some salts reach supersaturation, the salts precipitate a solid phase on the evaporation surface, and scale is formed.

3.Solubility decreasesWith the increase of the temperature of the pot water, the solubility of some salts in the pot water decreases, such as salts such as Cas04 and Casi03.

4.After reacting with each other, the salts with greater solubility in the water are reacted with other salts and alkalis in the pot water to form compounds that are insoluble in water, resulting in the formation of scale.

5.Water slag conversion, when there is too much water slag in the pot, and it is sticky, such as mg(OH)2 and mg3(p04)2, etc., if the sewage is not timely, it is easy to convert from mud slag to scale.

Removal of limescale:

1.Manual descaling.

2.Mechanical descaling.

3.Chemical descaling.

You can find Changsha Binrui to find out.

How to remove the black scale from the bottom of the pot.

Boiler fouling is caused by excessive calcium and magnesium ions in the raw water, which are the main culprits of boiler fouling. In order to solve the problem of boiler scaling, it is not enough to clean up, we must start from the source, and use Junhao environmental protection softened water equipment to remove the calcium and magnesium ions of boiler water and fundamentally solve the problem.

Boiler scaling is because the calcium and magnesium ions in the water are the majority, first clean the dirt in the boiler, and then treat the boiler water, and use softened water equipment to remove the calcium and magnesium ions in the inlet water, reduce the hardness of the inlet water, which can solve the problem of boiler scaling, and is also a protection for the boiler.

The water quality is relatively hard and contains elements such as calcium and magnesium. Wash with hot vinegar.

It is recommended to clean the dirt in the boiler first, and then use Junhao environmental protection softened water equipment to remove the calcium and magnesium ions in the inlet water and reduce the hardness of the inlet water, which can solve the problem of boiler scaling and protect the boiler.

Limescale can be roughly divided into two types: hard scale and soft scale according to the reason for its formation and forming state. When the water contains impurities such as carbonate colloids, bacteria and organic matter, the carbonate is similar to the sand and gravel in the cement mortar, and the colloids, bacteria and organic matter are equivalent to the cement in the cement mortar. Once viscous substances such as colloids, bacteria and organics have been removed (e.g. by ultrafiltration), even if the concentration of calcium, magnesium and carbonate ions in the water is high, it is carried out into a white and loose carbonate soft scale that can be easily removed, without the formation of hard scale.

This has happened in our company before; This is very normal is not the hardness of the normal can, the choice of soft water processor is also different, we now do not use soft water equipment to use the furnace treatment, water quality monitoring and chemical selection can be, the furnace treatment is more time-saving! Even if it is a soft water treatment, it is necessary to add chemicals; Our selection of Xiamen Shengquan Chemical Technology **** water treatment agent; The effect is obvious!