Clean various heat exchangers, condensers, industrial pipelines, boilers, and steam power plant condensers. Glan Chemical Co., Ltd. offers guaranteed cooperation.
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 boasts comprehensive business philosophy and the capability to research and develop industrial cleaning technologies, handling cleaning services for industrial, private enterprises, corporate chemical equipment, power plant equipment, condensers, boilers, and air preheaters. We also offer air conditioning cleaning, heat exchange equipment cleaning, and accept cleaning assignments for machinery and chemical equipment. Additionally, we provide cleaning services for refrigeration and heating equipment, including descaling.
Jining Grean Cleaning Co. offers a wide range of cleaning machines from 10mpa to 250mpa, with dozens in stock and over a dozen chemical cleaning pump stations. Our main services include power plants, chemical factories, oil mills, food processing plants, corporate entities, heating equipment, and more. The company also provides long-term industrial heat exchanger cleaning and solution design services 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 standardize and normalize the cleaning of heat exchange equipment.
Chemical Cleaning Scale Removal 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. A certain concentration of acidic solution is added, which circulates through the ash water pipes for cleaning. As the acid washing reaches a certain level, the solution is continuously replenished with more acid. For short-distance single ash water pipes, if conditions permit, a temporary pipeline can be laid to create a recirculation loop for cleaning. This process must be carried out while the system is offline, and it is complex and costly.
Pilot cleaning
No two ash pipes should form a loop during cleaning; only a single ash pipe should be used for open circuit cleaning. The method involves connecting one end of the ash pipe to the cleaning unit, continuously preparing a specific concentration of cleaning solution in the mixing tank, and then injecting it into the ash pipe continuously or intermittently. This process requires additional cleaning equipment during shutdown, which increases the cost.
Continuous cleaning without shutdown
The process involves continuously injecting a certain amount of acidic solution while the ash pipe is operating normally and not shut down. Simultaneously, a specific quantity of ash pipe operation cleaning inhibitor and pipeline cleaning descaler is added for open-loop cleaning. The primary function of the cleaning aid is to promote the reaction between the acidic solution and the ash scale at a certain concentration and flow rate, while also increasing its solubility in water, reducing the occurrence of air blockages, and ensuring the quality of ash pipe cleaning.
The procedure is as follows: Prior to cleaning, first 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 pipe's cleaning inhibitor and pipeline descaler addition according to the ash water flow rate and acidity. During the cleaning process, collect samples at the sampling point at the front of the ash pipe every 30 minutes to test the acidity, and strictly control the acidity by adjusting the flow rate of acid addition. In the latter stage of the cleaning, collect samples at the end of the ash pipe every 15 minutes to test the pH value. Once the pH value reaches a certain level and remains unchanged for 30 minutes, the cleaning can be considered 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 - High-pressure water jet cleaning of pipes and heat exchanger bores can completely remove scale and blockages inside, revealing the metal substrate. The high-pressure water jet, with its immense energy and supersonic speed, can fully destroy tough scale and blockages without causing any damage to the metal.
Since the pressure of high-pressure water is less than the compressive strength grade of metal, high-pressure cleaning will not damage the base material being cleaned.
(2) Rapid Cleaning Speed: Due to the combined crushing effects of water jet washing, splitting, shearing, and grinding, scale can be quickly broken and removed, making the cleaning speed several to ten times faster than traditional chemical methods, sandblasting and shot blasting, simple mechanical, and manual methods.
Components cleaned with high-pressure water jetting do not require secondary cleaning; however, those chemically cleaned need to be rinsed with clear water to remove the surface chemicals.
(3) No Environmental Pollution: As high-pressure water jet cleaning uses pure water as the medium, it does not produce a large amount of dust like sandblasting, grit-blasting, or simple mechanical cleaning, which can pollute the atmosphere and harm health. Nor does it generate 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 using other methods to below the national safety standards, thus causing no pollution.
Pipe Scale
(1) Classified by chemical composition, it can be categorized into 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) Categorized by physical properties, there are two types: scale that firmly adheres to the pot shell and pipe walls, and sediment that is loosely textured and easily detached.
Scale primarily forms due to the salts like calcium and magnesium in the boiler feed water that precipitate and adhere to the metal surface upon heating. The thermal conductivity of scale is very low, approximately 2 to 5 times that of ordinary steel. Scale on the boiler's heating surface greatly worsens the heat transfer efficiency, affecting the boiler's performance; it can easily cause metal materials to burn due to local overheating, even leading to pipe explosion accidents; it accelerates galvanic corrosion, causing pipeline scale corrosion, and speeding up the damage to the heating surface. Once scale forms, it should be removed promptly using mechanical or chemical methods.
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