PHE Cleaning

- Methods of Cleaning Toward 4 Different Impurities

Before cleaning the plate heat exchanger, we need to make a reasonable analysis of the internal medium and dirt of the heat exchanger in order to choose a smart, efficient and economical PHE cleaning method. The usual dirt includes scale, oil, burnt matter, muddy dirt, medium sticky matter and so on. The following content is a general overview of some coach approaches in terms of cleaning.

1. Mud dirt, medium adherents such as food, etc. non-adhesive dirt.
A. Generally, cooling water contains impurities, if it is “open water sources”, there must be a certain amount of sand and mud. Such impurities will adhere to the plates after entering the plate heat exchanger, but the adhesion is not strong, which could be rinsed with water. And high-pressure water gun should be your first choice, which is simple and quick, and there is no obvious requirement for water quality and temperature, just use tap water.
B. For the plate heat exchangers applied in such as milk, juice, beer, beverages and other food fields, the medium is easy to adhere to the plates, and the adhesion is slightly strong. For this type of heat exchanger, high-pressure water guns can be used for flushing, besides that, you could also use CIP .

2. Scale.
The main components of scale are calcium carbonate, calcium sulfate, magnesium hydroxide and so on. After the scale is formed, it adheres to the board, and it is difficult to wash and remove. So, chemical cleaning is required. Utilizing the principle that carbonate can react with acidic solution, soaking with acidic cleaning agent, and then washing, can well remove stubborn scale. After cleaning, it is necessary to conduct random inspections of the plates for penetration testing to check whether the plates have perforations, cracks, and so on.

3. Oily dirt.
Oily dirt is formed by long-term adhesion of oily medium to the plate surface. Stubborn dirt is difficult to remove by ordinary rinse. But, those plates can be soaked with a degreasing agent, combined with 25-40 degrees warm water, to remove the oil.

4. Acid-base dirt.
This type of fouling is mainly caused by long-term residues of acid and alkaline media attached to the surface of the board. We can use the principle of acid-base neutralization reaction, with the corresponding acid or alkaline cleaning solution to soak and rinse the plates to remove dirt. After cleaning, it is necessary to conduct random inspections of the plates for penetration testing to check whether the plates have perforations, cracks, and so on.

- Common Detergents

1, PHE cleaning agent
Precision systems such as special plate heat exchanger can be used for disassembly type large plate replacement system or chemical cleaning of welding machine, and no corrosion to stainless steel.

 

[Product Features]
● removes inorganic salt dirt such as scale, rust, cement, lime stains and so on
● is safer and effective than most acid cleaners; no corrosion to stainless steel under recommended conditions
● is dedicated to relatively demanding cleaning such as air conditioning heat exchanger equipment

 

[Instrument](welding-type whole machine chemical cleaning)
1. Backwash the plate type heat exchanger: close the inlet valve, disconnect the inlet, open the outlet valve, rinse to remove the unsound rust dirt and sticky mud for 3-5 minutes, and Kangxing clay stripping agent can also be used to remove rust slag and sludge;
2. cleaning liquid preparation: mix in a ratio of 1: 5~15 when cleaning the plate type heat exchanger in a small cycle; mix in a ratio of 1: 30~50 when cleaning hot water side system in a large cycle; mix in a ratio of 1: 100~150 when cleaning the cold water side system in a large cycle;
3. cleaning time: cleaning in a small cycle should be completed within half an hour to 1.5 hours, and cleaning in a large cycle should and must be completed at most 4 hours;
4. waste liquid exclusion: please use acid washing neutralization agent to pH value 7-8 to conduct sewage discharge before removing the waste liquid;
5. rinse the system thoroughly with clear water for about half an hour to remove all residues;
6. after filling with clear water, add corrosion inhibitor and microbial killer regularly to maintain the system.
Prepare: using No. 9 to protect the system from corrosion is more safe and reliable after cleaning plate.

2, Water-based general oil remover applied for room temperature
[Function and Scope of Application]
It has super emulsifies to mineral oil (especially for engine oil). It can be widely used for cleaning mineral oil dirt on the surface such as ferrous metal and stainless steel in mechanical manufacturing, surface treatment and maintenance. It is also suitable for cleaning the hard ground, wall, equipment and work platform. It should be used with caution in aluminum or zinc and their alloys.

 

[Features]
1. can remove a variety of mineral oils at normal temperature, which can save equipment investment and energy;
2. replaces gasoline, kerosene and other solvents, which is safe to use;
3. has no peculiar smell, no gas volatilization and no pollution to the operating environment, which is conducive to the health of the operators;
4. is powerful emulsifying type, which removes oil pollution thoroughly, no residue or low residue; the cleaning effect can reach the organic solvent if combined with the appropriate mechanical action such as ultrasonic etc. ;
5. has high oil tolerance which is more than three times higher as much as the conventional water-based cleaning agent, that will reduce the user cost greatly and the environmental impact accordingly;
6. has strong water quality adaptability, and the usual water hardness has no effect on the cleaning effect;
Is low bubble, easy to use, water-saving;
7. is non-corrosive to ferrous metals and stainless steel;
8. is phosphorus-free which is environmentally friendly.

 

[Instrument]
1. protects stainless steel or items with paint such as paint, see table below

Recommended Concentration 2~6% (depending on the weight of the dirt, generally: 4%)
Temperature Normal temperature (optimum temperature: 25~40 ℃, proper temperature for solid state dirt. )
Cleaning method Soaking, brush washing, ultrasonic wave, etc.(Not applicable to high-pressure spray and other ways to violently disturb the bubbles! )

It is conducive to removing oil pollution by proper mechanical forces, but don’t mix with other cleaners!

2. Effective dehydration treatment is recommended immediately, such as drying after cleaning of cast iron, carbon steel and other rust items. If effective dehydration is not possible immediately, it is recommended to do rust-proof rinse with Wisconsin-AC1 after cleaning. Methods are as follows:
Cleaning: See the table above for the cleaning conditions.
Rust prevention treatment (workshop rust prevention): rinse the item immediately with a 4~6% Wisconsin-AC1(water-based rust inhibitor) aqueous solution for no less than one minute after cleaning.
The objects must be cleaned up because the degree of cleanliness will significantly affect the effect of antirust treatment!

[Stability and chemical reactivity]
Stability: The product is determined to be stable at normal temperature and pressure.
Inadmissibility: An impermissibility for strong oxidation / reducing agents.
No harmful polymerization reaction occurs.

3, Steam and condensate and pipeline corrosion inhibitor
Neutralize amine for vocalization for alkaline liquid which is used to raise the pH value of condensate and steam to a level that does not produce corrosion. Combining with carbon dioxide in the condensate water that removes the corrosive activity of the latter.

 

[Features]
Prevent corrosion of steam and condensate lines
Reduce consumption of water and fuel and the cost of steam production

 

[Instrument]
Usage quantity
The dosage depends on the alkalinity of the feed water, and it is appropriate to maintain the condensate pH in the range of 8.3 to 9.0. The dosage should be adjusted as per the test results; if the steam is directly used for food processing (except for dairy products), the maximum residual concentration shall be not more than 10ppm.
Adsing method
For optimum results, it is recommended to inject steam lines from the split cylinder. It can also be recommended to pour the product into the boiler feed line by pulse agent feed pump directly, meanwhile agent feed pump should be linked with boiler feed pump.

4, Boiler scale agent

It is powerful and safe product specially used for descaling boiler systems, which is the higher the temperature, the better its effect. Its performance of unique security and efficiency is fully recognized by customers.

 

[Instrument]
1. usage concentration: approximately 10%
2. washed pickling 6 with a amount of 5 kg / ton of water.
3. you should know the structure and material of the boiler in detail before chemical cleaning, and carefully check the inlet and outlet of it to determine the cleaning method and develop safety measures. The pretreatment should be made for boiler leakage or blockage problems.
4. the general cleaning time takes about 6 to 9 hours according to the thickness of the dist.
5. After cleaning, drain off the residual liquid and rinse the boiler with boiler rinsing.

5, Safe smoke-free descaling agent

● no corrosion to stainless steel, ceramics, etc
● wide range of use
● can be used of more precision systems such as plate heat exchanger

 

It is safer and effective than most of the acid cleaners; it is formulated in a special way that can be used to remove kinds of inorganic salt dirt such as scale, rust, cement and lime stains from converting into water solvent; it is no corrosion to stainless steel, ceramics, etc. It is particularly suitable for high demand cleaning such as air conditioning heat exchanger equipment.

 

[Instrument]
Unfirm rust and dirt can be removed by washing and soaking system.
Prepare the cleaning liquid in the ratio of 1: 5-15 when cleaning the main machine.
Cycle the system: it will take about 4-8 hours for the host cleaning.
Please neutralize with the acid wash neutralization agent to pH 7-8 to ensure that the effluent discharge reaches the national discharge standard before draining off the residual liquid.
Wash the system thoroughly with clear water 1-2 times to remove all residues.
After filling clean water, add a common corrosion inhibitor and microbial killer regularly to maintain the system.

6, Antioxidant and corrosion inhibitor

It is suitable for pickling and oxidation resistance during rinse of the system such as plate type heat exchanger .
Product Features
● for resistance against oxidation corrosion during rinse after pickling
● applicable for pickling of the system such as plate type heat exchanger

 

[Instrument]
The recommended concentration:
1) 200 kg water with 1 kg agent;
2) 1 ton of water with 5 kg agent.

7, compound alkaline cleaning agent (special for pasture)

● rapid penetration and suspended dirt for fast and efficient cleaning
● various cleaning ways, energy saving and time saving
● strong hard water resistance capacity
● wide applicable temperature range
● no corrosion to stainless steel
● phosphorus-free

[Product Features] It is a powerful caustic soda cleaning agent that can be used for single-phase cleaning.

[Scope of application] It is used to remove organic and inorganic dirt from the production system in ranching, beer, beverage, dairy and food processing.

[Technical indicators]
Appearance: colorless to light yellow liquid
Foam: None
pH (1% solution): 12-13
Effective base (in sodium hydroxide,%): ≥ 30.0

[Material compatibility]
Compatible with the following materials under the normal recommended use conditions:
Metal: Steel, stainless steel (DIN 1.4301=AISE 304 or above quality)
Plastics: alkali-resistant plastics like PC, PE, PP, PTFE, PVDF, PVC

[Instrument]
1. is suitable for any automatic cleaning and CIP process in any water hardness conditions.
Brewing and beverage industry: For Tank, pipe, filter and storage tank, clean at 0.5-3.0% of the concentration used and normal temperature to 80 ℃, which cleaning time depends on the circumstances.
Dairy industry: for cheese ripening cylinder, Tank and pipeline, clean at 0.5-2.0% of the concentration used and temperatures ranging from 50℃ to 80 ℃, which cleaning time depends on the specific situation.
passipassivation precleaning: clean for 1 to 3 hours at normal temperature to 85 ℃ and 9 to 12% of the concentration used, then rinse thoroughly.
PC barrel / bottle cleaning: clean for 1-2 minutes at the temperatures ranging from 40 to 80 ℃ and 0.5-1% of the concentration used. It is Especially suitable for heavy sewage bottles under hard water quality conditions.

8, Special detergent for milking equipment (acid)

The main ingredients of this product are phosphoric acid and sulfuric acid. It is mainly used to remove calcium and magnesium and other inorganic salts in milking equipment that cannot be cleaned by alkaline detergent, which is suitable for the removal of milk scale and dairy stone.

 

[Scope of Application]
It is suitable for the cleaning of pipes, milk buckets and milk storage tanks of large and small milking machines

[Product Features]
It has low corrosion to the equipment, which can prolong the service life of the equipment and reduce the depreciation rate;

It is a kind of composite acid and adds the corrosion mitigation component, that has a small corrosion effect on the equipment metal parts;
It is no foam and has strong cleaning ability,which reacts violently with calcium and magnesium salts, that can also be used to remove scale;
It can remove the rust spots on the equipment obviously.

 

[Instrument]
Use ratio is 0.4% to 1%;
Use by diluting with deionized water at 55 to 60 ℃;
Cycle cleaning for 8-10 minutes or soak for 20 minutes;
The discharge water temperature can not be less than 40 ℃ after circulating cleaning;
Flush with clean water to neutral after cleaning.

[Notes]
1. it cannot be mixed with alkaline detergent containing chlorine, otherwise toxic gas chlorine will be released; the product raw liquid will corrode stainless steel, so do not use directly.
2. rubber gloves and protective glasses are required for operation.
3. accidentally into the eyes: rinse eyes immediately with a lot of cold water continuously at least 15 minutes;
entrance: seek medical advice immediately. Accidentally into the mouth, wash your mouth immediately and drink 1 or 2 cups of water or milk on the contrary to vomit yourself;
inhalation: move to the fresh air section immediately. Please seek medical advice in time in serious cases.
4. it must be placed beyond the contact of the children.
5. Avoid light, heat and pressure during storage and transportation.

- High-Pressure Cleaner

Place of Use:
1. Cleaning heat exchanger, condenser, condenser, cooling tower, economizer, reaction kettle, pressure vessel and rotor for chemical plants, steel mills and power plants.

2. Cleaning of the outer wall of sewage treatment plant pool and external cleaning of various facilities.
3. Cleaning of hull rust removal, paint removal and rotary kiln of the cement plant.