Clean various heat exchangers, condensers, industrial pipelines, boilers, and steam power plant economizers. GlanChem Cooperation Ensures Satisfaction.
Jining Green Chemical Technology Co., Ltd. (简称 Jining Green Cleaning Co.) was established in 2010 and is a professional company specializing in the cleaning of various industrial heat exchange equipment. The company has comprehensive business philosophy and the capability to develop industrial equipment cleaning technologies. We undertake cleaning services for industrial, private enterprise, and corporate chemical equipment, power plant equipment, condensers, boilers, and boiler air preheaters; as well as air conditioning cleaning, heat exchange equipment cleaning, and cleaning of machinery and chemical equipment. We also handle cleaning and descaling of refrigeration and heating equipment.
Jining Grean Cleaning Co. has dozens of cleaning machines with models ranging from 10mpa to 250mpa, as well as over a dozen chemical cleaning pump stations. Our main services include power plants, chemical factories, oil mills, food factories, corporate entities, heating equipment, and more. The company also provides long-term industrial heat exchanger cleaning and design solutions to industry clients.
Our company has newly acquired domestic cleaning machines and imported cleaning equipment. We have hired experienced technical specialists in the cleaning industry to achieve standardization and normalization of heat exchanger cleaning.
Chemical descaling process:
Recirculating closed-loop cleaning
Recirculating cleaning utilizes two existing parallel ash piping lines to form a loop, creating a recirculation system with the cleaning pump station. It introduces a solution of a certain acidity concentration, which circulates through the ash water pipes for cleaning. As the acid washing reaches a certain level, acid is continuously replenished. For short-distance single ash water pipes, if conditions permit, a temporary pipeline can be laid to form a recirculation loop for cleaning. This process must be carried out while the system is offline, and it is complex and costly.
Open Channel Cleaning
No two gray pipes should form a loop during cleaning; only a single gray pipe should be used for open-path cleaning. The method involves connecting one end of the gray pipe to the cleaning unit, continuously preparing a specific concentration of cleaning solution in the dosing tank, and then injecting it into the gray pipe continuously or intermittently. This process requires additional cleaning equipment during shutdown, which increases costs.
Continuous operation cleaning
The process involves continuously injecting a specific amount of acidic solution while also adding a certain quantity of ash conveying pipe cleaning inhibitor and pipeline descaling agent. This is an open circuit cleaning method. The primary function of the cleaning aids is to promote the reaction between the acidic solution and the ash scale at a certain concentration and flow rate, simultaneously enhancing its solubility in water and reducing the formation of air blockages, ensuring the quality of ash pipe cleaning.
The procedure is as follows: Prior to cleaning, estimate the required acid quantity based on the total scale in the pipeline. Then, calculate the acid addition rate and the flow rate of the descaling agent and pipeline cleaning agent by considering the sludge water flow rate and acidity. During cleaning, collect samples at the front end of the sludge pipe every 30 minutes to test the acidity and strictly control it by adjusting the acid flow rate. In the later stage of cleaning, test the pH value at the end of the sludge pipe every 15 minutes. When the pH value reaches a certain level and remains unchanged for 30 minutes, the cleaning process can be deemed complete.
2. High-pressure water jet cleaning machinery
High-pressure water jet cleaning offers high efficiency, low costs, non-damaging to workpieces, environmental protection, ease of operation, and safety advantages.
High-pressure water technology boasts the following advantages.
(1) High-quality cleaning - During the high-pressure water jet cleaning of pipeline and heat exchanger bores, it can completely remove scaling and obstructions inside the pipes, revealing the metal substrate. The high-pressure water jet, with its immense energy and supersonic speed, is fully capable of destroying hard scaling and obstructions without causing any damage to the metal.
The high-pressure water pressure is less than the compressive strength grade of metal, so high-pressure cleaning will not damage the cleaned substrate.
(2) Rapid Cleaning Speed: Due to the combined action of jet washing, chiseling, shearing, and grinding from the water jet, scaling can be quickly broken and removed, which is several to ten times faster than traditional chemical methods, sandblasting, ball-blasting techniques, simple mechanical, and manual cleaning methods.
Parts cleaned with high-pressure water jet do not require secondary cleaning; however, those chemically cleaned need to be rinsed with clean water to remove the surface chemicals.
(3) No Environmental Pollution: Since high-pressure water jet cleaning uses pure water as the medium, it does not generate a large amount of dust like sandblasting, shot blasting, or simple mechanical cleaning, which can pollute the atmosphere and harm health. It also does not produce a large volume of waste liquid like some chemical cleaning methods, which can contaminate rivers, soil, and water quality. The water jet cleaning with pure water as the medium is odorless, tasteless, and non-toxic. After atomization, it can also reduce the dust concentration in the work area, lowering atmospheric dust from 80mg/m³ with other methods to below the national safety standards, thus causing no pollution.
3. Pipe Scale
(1) Classified by chemical composition, they include carbonate scale, sulfate scale, silicate scale, and mixed scale, among others. The main components of carbonate scale are calcium carbonate and magnesium carbonate; the main components of sulfate scale and silicate scale are calcium sulfate and silicate compounds, respectively.
(2) Categorically divided by physical properties, there are two types: hard water scale firmly adhering to the pot shell and tube walls, and loose sediment that is easy to detach.
Scale is primarily formed when salts containing calcium and magnesium in the boiler feedwater precipitate and adhere to the metal surface upon heating. The thermal conductivity of scale is very low, about 2 to 5 times that of ordinary steel. Scale buildup on the boiler's heat-absorbing surface can significantly worsen heat transfer efficiency, impacting the boiler's performance; it can easily lead to the burning of metal materials due to localized overheating, even causing pipe explosion accidents; it also accelerates galvanic corrosion, causing pipeline scale corrosion, and speeds up the deterioration of the heated surface. Once scale forms, it should be promptly removed using mechanical or chemical methods.
Heat Exchanger and Refrigeration Equipment Cleaning - Choose Grean Chemical for Reliability
