How to clean the fouling of the heat exchanger in the chemical plant

We have developed a variety of anti-scale methods, such as ultrasonic, electromagnetic field, rotating parts of the heat transfer tube, installation of springs moving back and forth in the heat transfer tube, addition of scale inhibitors, special treatment of heat transfer surfaces, prevention of boiling in the heating chamber (adding liquid column or reverse circulation above the heating chamber), increasing the flow rate, etc.

I would also like to introduce to you a fluidized bed heat exchange and anti-scale technology from Tianda Institute of Chemical Engineering, which is a national "Ninth Five-Year Plan" scientific and technological research project, and has won the national invention patent, which is an international leading solution.

Anti-scaling, descaling, enhanced heat transfer, energy saving.

Applications: evaporators, preheaters, condensers, reboilers, boilers and heat pipes and other heat exchange equipment in petroleum, chemical, inorganic salt, pharmaceutical, food, papermaking, metallurgy, wastewater treatment, seawater desalination and other industries.

Basic principle: the heat exchange process and fluidized bed technology are combined to form a fluidized bed heat exchange system, in which the fluidized solid particles move chaotically to destroy the flow boundary layer and heat transfer boundary layer at the heat transfer wall, so as to achieve the purpose of strengthening heat transfer in the tube and preventing and descaling.

Performance characteristics: fluidized bed heat exchange, anti-scale and energy-saving technology has stable operation, strong applicability, simple and easy transformation, and mainly has the following characteristics:

1) Inert solid particles will not pollute the feed liquid to ensure product quality;

2) It can be both anti-scaling and descaling;

3) It can control the cycle of inert solid particles in the equipment;

4) It can be used for both forced and natural cycles;

5) The mechanism of strengthening heat transfer and anti-scaling and descaling has nothing to do with the nature of the material;

6) The anti-scale and enhanced heat transfer effects of small-scale, pilot-scale and large-scale industrial production are basically the same;

7) The convective heat transfer coefficient of the tube side can be increased to many times;

8) It can reduce the wall temperature of the heat exchange tube and reduce corrosion;

Transformation plan: the use of fluidized bed heat exchange anti-scale energy-saving technology, the traditional evaporator and heat exchanger are transformed, the transformation workload is small, the time is short, and the main work of the transformation is as follows

1) The main equipment of the original evaporator or heat exchanger is not moved;

2) Install a separator on the evaporation or heat exchange device to realize the separation of materials from fluidized solid particles. The solution and crystallization are discharged through the separator, while the fluidized particles circulate in the evaporation or heat exchanger and are not carried out of the device with the material. The separator is external, which is prepared in advance before the transformation and installed during the transformation;

3) According to the structural parameters, operating parameters and material characteristics of the original device, design the optimal fluidized particle parameters in line with the evaporation or heat exchange device;

4) Take necessary technical measures to achieve uniform distribution and good circulation of fluidized solid particles in the tube bundle of evaporation or heat exchange device;

5) Determine whether to change the forced cycle to a natural cycle according to the specific situation;

6) On the evaporation device or heat exchanger, a particle feeding device is installed, which can realize non-stop particle addition. The particle feeding device is external, done in advance, and can be installed during the transformation.

Detail** Q7050Q23436

It is best to disassemble and clean, so that the scale layer on the plate can be removed more thoroughly, and at the same time, you can check whether the sealing gasket is aged and needs to be replaced. Chuante Plate Heat Exchanger (Beijing) **** Shanghai Service Center provides professional heat exchanger cleaning and maintenance, you can contact if necessary.

The water treatment agent is cleaned by a closed circulation.

The specific cleaning method is as follows:

1. Before pickling, the heat exchanger should be washed openly, so that there are no impurities such as mud and scale inside the heat exchanger, which can improve the effect of pickling, and can also reduce the acid consumption of acid and sparrow washing;

2. Pour the cleaning solution into the cleaning equipment and then inject it into the heat exchanger;

3. Statically soak the heat exchanger filled with acid solution for 2 hours, and then continuously circulate dynamically for 3 to 4 hours. During the period, the positive and negative cleaning is carried out every 30 minutes, and the acid can be reused if the pH value of the acid is greater than 2, otherwise, the pickling solution should be diluted and neutralized and discharged;

4. After the pickling is completed, the sodium hydroxide softened water is prepared in a certain proportion, and the heat exchanger is alkali washed by dynamic circulation to achieve acid-base neutralization, so that the heat exchanger plate will no longer corrode;

5. After alkali washing, use clean softened water to rinse the heat exchanger repeatedly for 30 minutes, and then rinse the residue in the heat exchanger thoroughly;

6. During the cleaning process, the time of each step should be strictly recorded to check the cleaning effect.

After long-term use, it is recommended that the heat exchanger be cleaned and repaired regularly, which will help to extend its service life and improve work efficiency and safety. The specific steps are as follows:

First, disconnect the heat exchanger from power and make sure it is completely cooled before cleaning.

Then remove the shell and use a brush to clean the raceway, air duct and various parts of the inner tube of the heat exchanger to completely remove the attached dust and stains. If the oil inside is severe, it is also necessary to wash it with detergent and rinse it thoroughly.

Secondly, check the parts of the heat exchanger, such as motors, fans, batteries, etc., and replace them in time if they are found to be damaged or abnormal. Reassemble the parts together safely and reliably, and check whether the pipes and joints are sealed to avoid air leakage and electricity leakage.

Thirdly, the heat exchanger of alternating current still needs to be repaired and inspected for circuits and joints, and if it is found to be damaged, it needs to be replaced. Reassemble the whole machine together, check whether the switches and controls are normal, and then carry out power-on and trial operation to ensure that the operation is normal before it can be put into use.

Finally, when starting up for the first time after cleaning and maintenance, it is still necessary to pay attention to whether there is abnormal heating or burnt smell in each part to ensure the safe operation of the heat exchanger.

It is recommended to use it for the first time for 3-5 hours after cleaning and maintenance, and check it regularly during use, and turn off the power immediately and contact professionals for repair once an abnormal situation is found. A well-cleaned and well-maintained heat exchanger will be able to provide us with a warm and safe winter, so that life can be full of vitality again! I hope the above content can provide you with a reference for heat exchanger cleaning and maintenance, and bring you convenience in the process of use.

1.Check the appearance of the heat exchanger, check whether there is any external damage, if there is damage, it should be repaired in time.

2.Check the cleanliness of the inside of the heat exchanger, and if there is dirt, it should be cleaned in time.

3.Check the connectors of the heat exchanger, and if there is any looseness, they should be tightened in time.

4.Check the exhaust port of the heat exchanger, and if there is a blockage, it should be cleaned up in time.

5.Check the controller of the heat exchanger, if there is a fault, it should be repaired in time.

A heat exchanger is a device used to transfer heat and is commonly used in industrial production and HVAC systems. Due to long-term use and environmental factors, dirt and impurities will accumulate inside the heat exchanger, affecting its heat transfer efficiency and service life. Therefore, it is important to clean and maintain the heat exchanger regularly.

There are several methods of heat exchanger cleaning, common ones include mechanical cleaning, chemical cleaning, and high-pressure water cleaning. Mechanical cleaning is the use of brushes, wire balls and other tools for smaller heat exchangers. Chemical cleaning is the use of chemicals to dissolve dirt and impurities, and is suitable for larger heat exchangers.

Sakura pin high-pressure water cleaning is the use of high-pressure water flow to wash away dirt and impurities, suitable for various specifications of heat exchangers. Heat exchanger maintenance mainly includes replacing seals, repairing leaks, replacing damaged parts, etc. Replacing seals is the most common way to repair because seals are susceptible to thermal expansion, contraction, and corrosion, resulting in leaks.

Repairing a leak is the repair of a leak on the surface of a heat exchanger, usually with a welded or filler material. Replacement of damaged parts refers to the replacement of damaged parts inside the heat exchanger, such as pipes, pumps, etc. In conclusion, heat exchanger cleaning and maintenance is an important measure to ensure its normal operation and extend its service life, and it needs to be carried out regularly.

When cleaning and repairing, attention should be paid to safety and environmental protection to avoid harm to the environment and personnel.

The cleaning and maintenance of the spine heat exchanger requires Sun Ran to enter the specific operation of Yingkai according to the different types of heat exchangers. Some common repair methods include cleaning heat exchanger lines, replacing aging and damaged seals, replacing broken lines, replacing electrical components, etc. If you don't know how to deal with it, it is recommended that you contact a professional maintenance personnel for inspection and repair.

Answer: If the scaling is not serious, you can use the thermal shock method: first close the cold water inlet and outlet valves, pass the heat medium for a period of time, close the heat medium valve, open the cold water, repeat it several times, you can see that there is white scale; If the scale is severe, take the copper pipe out and bake it with a welding torch, and the scale will also come down.

A heat exchanger (also known as a heat exchanger or heat exchange device) is an industrial application of convection heat transfer and heat transfer to a cold fluid to transfer heat from a hot fluid to a cold fluid to meet specified process requirements. Heat exchangers can be classified in different ways. According to its operation process, it can be divided into three categories: partition type, hybrid type, and regenerative type (or recuperative type); According to the compactness of its surface, it can be divided into two categories: compact and non-compact.

Generally, the sewage heat exchanger is blocked, and it can be cleaned with a high-pressure water gun, and the general pipe blockage is impurities, and the main air flow path of the heat exchanger can also be backflushed.

Question: Is acid-base solvents OK? Kiss.