Clean various heat exchangers, condensers, industrial pipelines, boilers, and steam power plant economizers. Glan Chemical Co., Ltd. offers guaranteed cooperation.
Jining Green Chemical Technology Co., Ltd. (简称 Jining Green Cleaning Co.) was established in 2010 and specializes in the cleaning of various industrial heat exchange equipment. The company has comprehensive business philosophy and the capability to research and develop industrial cleaning technologies. We undertake cleaning services for industrial, private enterprise, and corporate chemical equipment, power station equipment, condensers in power plants, boilers, and economizers. We also provide air conditioning and heat exchange equipment cleaning, as well as cleaning for mechanical and chemical equipment. Additionally, we handle cleaning and descaling for refrigeration and heating equipment.
Jining Grean Cleaning Co. offers a wide range of cleaning machines from 10MPa to 250MPa, with dozens of units available. We also provide over a dozen chemical cleaning pump stations. Our main services are to power plants, chemical factories, oil refineries, food factories, corporate entities, heating equipment, and more. The company also offers long-term industrial heat exchanger cleaning and design solutions to industry clients.
Our company has recently acquired domestic cleaning machines and imported cleaning equipment. We have hired experienced technical specialists in the cleaning industry to standardize and regulate the cleaning of heat exchange equipment.
Chemical cleaning descaling process:
Recirculating closed-loop cleaning
Circulating cleaning involves using two existing parallel ash piping lines to form a loop, which is connected to the cleaning pump station to create a circulating system. A solution of a certain acidity concentration is added, allowing it to circulate and clean within the ash water pipes. As the acid washing decreases to a certain level, acid is continuously replenished. For short-distance single ash water pipelines, if conditions permit, a temporary pipeline can be laid to form a circulating loop for cleaning. This process must be carried out while the system is shut down, and it is complex with higher costs.
Open channel cleaning
No two gray pipes can form a loop during cleaning; only a single gray pipe can be used for open-loop cleaning. The method involves connecting one end of the gray pipe to the cleaning unit, continuously preparing a certain 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, resulting in higher costs.
Continuous cleaning without shutdown
The process involves continuously injecting a certain amount of acidic solution while simultaneously introducing a specific quantity of ash-carrying pipe cleaning inhibitor and pipeline descaling agent. This is an open-circuit cleaning method. The primary function of the cleaning aids is to enhance the reaction between the acidic solution and the ash scale at a certain concentration and flow rate, while also increasing its solubility in water and reducing the occurrence 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 ash slurry pipeline's corrosion inhibitor and pipeline cleaner based on the flow rate of the grey water and acidity. During cleaning, collect samples at the front end of the ash pipeline every 30 minutes to test acidity and strictly control it by adjusting the flow rate of acid addition. In the latter stage of cleaning, collect samples at the end of the ash pipeline every 15 minutes to test the pH value. Once 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 equipment
High-pressure water jet cleaning offers advantages such as high efficiency, low cost, non-damaging to workpieces, environmental friendliness, ease of operation, and safety.
High-pressure water technology boasts the following advantages.
(1) Excellent Cleaning Quality - The high-pressure water jet cleaning of pipes and the internal holes of heat exchangers can thoroughly remove all scale and blockages inside, revealing the metal substrate. With its immense energy and ultra-sonic speed, the high-pressure water jet is fully capable of destroying hard scale and blockages, yet it has no detrimental effect on the metal.
Due to the pressure of high-pressure water being less than the compressive strength grade of metal, high-pressure cleaning will not damage the base material being cleaned.
(2) Fast Cleaning Speed: Due to the combined effects of water jet scouring, wedging, shearing, and grinding, scale can be quickly broken and removed, making the cleaning process several to ten times faster than traditional chemical methods, sandblasting, simple mechanical, and manual methods.
Components cleaned with high-pressure water jetting do not require secondary cleaning; however, after chemical cleaning, the surface chemical must be rinsed off with clean water.
(3) No Environmental Pollution: As high-pressure water jet cleaning uses pure water as the medium, it does not generate large amounts of dust like sandblasting, grit-blasting, or simple mechanical cleaning, which can pollute the air and harm health. It also does not produce large volumes 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, the spray 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. Therefore, it does not cause any pollution.
Pipe Scale
(1) Classified by chemical composition, they include carbonate scale, sulfate scale, silicate scale, and mixed scale, etc. 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) Classified by physical properties, there are two types: a hard scale that firmly adheres to the pot shell and tube walls, and a loose sediment that is easily detached.
Lime scale primarily forms due to the salts of calcium and magnesium in the boiler feed water, which precipitate and adhere to the metal surface upon heating. Lime scale has a very low thermal conductivity, about 2 to 5 times that of ordinary steel. When lime scale accumulates on the boiler's heating surface, it severely degrades heat transfer efficiency and affects the boiler's performance; it can also easily cause metal materials to burn due to localized overheating, potentially leading to pipe explosion accidents; it accelerates galvanic corrosion, causing pipeline lime scale corrosion and speeding up the deterioration of the heating surface. Once lime scale forms, it should be removed promptly using either mechanical or chemical methods.
Heat Exchanger & Refrigeration Equipment Cleaning - Choose GreenChem for Confidence
