How much do you know about the cleaning process of plate heat exchangers? Maybe for many strangers, this is a big problem; how to effectively clean the plate heat exchanger, we need to have a good understanding of the product structure, and then targeted cleaning, in order to improve the efficiency of the equipment, so that equipment renovated; Following are 14 plate heat exchanger cleaning process, I hope to help you. .

What is plate heat exchanger? What is the structure? What is the working principle of the plate heat exchanger? What is the shape of the product? How big is the appearance of the product, how much is the weight, and what is the area of the product? With these questions, let's learn together.

Plate heat exchanger is a kind of high-efficiency heat exchanger made of a series of corrugated metal sheets. A thin rectangular channel is formed between plates, and heat exchange is performed through the sheet. Plate heat exchanger is an ideal equipment for heat exchange between liquid, liquid and steam. It has the characteristics of high heat transfer efficiency, small heat loss, compact and light structure, small floor area, wide application and long service life. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of tubular heat exchanger, occupying one third of the area of tubular heat exchanger, and the heat recovery rate can be as high as 90%.

Two. Cleaning process for plate heat exchangers

1. isolate the equipment system and drain the water in the heat exchanger.

2. use high pressure water to clean mud and algae stored in the pipeline and seal the system.

3. Install ball valves between isolation valves and exchangers (not less than 1 inch = 2.54 cm), and both inlet and backwater outlets should be installed.

4. connect the conveying pump and the connecting pipe, so that the cleaning agent is pumped from the bottom of the heat exchanger and flows out from the top.

5. start to pump the necessary cleaning agent into the heat exchanger (the ratio can be adjusted according to the specific conditions).

6. repeat cycle cleaning to recommended cleaning time. As the cycle progresses and the sediment dissolves, the amount of gas generated during the reaction increases, and excess air should be discharged at any time through the vent valve. As the air is exhausted, the space in the heat exchanger will increase, and appropriate water can be added. Do not inject a large amount of water at the beginning, which may cause water to overflow.

In the 7. cycle, the effectiveness of the cleaning agent should be checked regularly. The PH test paper can be used to determine the effectiveness. If the solution is kept at pH 2 to 3, the cleaning agent is still effective. If the pH value of the cleaning agent reaches 5 to 6, more detergent should be added. The pH value of the solution remained unchanged for 30 minutes at 2 to 3, indicating that the cleaning effect was achieved. Note: the cleaning agent can be recycled and reused, resulting in waste.

8. after cleaning time, the cleaning solution is recovered. Rinse the exchanger repeatedly with clean water until it is clean to neutral. The pH value 6~7 is measured by PH test paper.

9. after cleaning, it can start operation. You can also suppress the test to see if there is any leakage. If there are leaks, polymer composites can be used to repair and protect the equipment, and can greatly extend the service life of the equipment.

10. after the equipment is stable, record the current media over flow, working pressure, heat transfer efficiency and other data.

11. Comparing the change of the value before and after cleaning, we can calculate the cost of electricity and coal saved per hour and improve the work efficiency. This is the value compensation of the enterprise using technology application.

12. the same operation method can also be used for condenser and frame type heat exchanger cleaning.

13. If the enterprise needs equipment for passivation pre-film treatment, can be operated according to the following procedures: passivation pre-film agent according to the recommended dilution ratio pumped into the equipment (at the same time in the circulating tank hanging test film); according to the recommended time cycle, immersion; detection of pre-film effect (red dot method or blue dot method); discharge; water rinse clean to neutral (with PH method); Test paper was used to determine pH value 6~7).

14. After the passivation of pre-film, it is better to use fans and other ventilation equipment to dry the system, to ensure and enhance the passivation of pre-film effect.

Guangzhou Qingli plate heat exchanger manufacturer, 10 years of experience, professional focus, wholeheartedly create green energy-saving and environmental protection and high-efficiency products, for the majority of customers to provide better plate heat exchanger, for energy-saving emission reduction, environmental protection management to add a force; if you need to know more about plate heat exchanger product knowledge, clean technology, real-time off If you have any problems with plate heat exchangers, you can also call 020-28140958. We are sincerely at your service.