Clean various heat exchangers, condensers, industrial pipelines, boilers, and power plant equipment condensers - Grange Chemical Co. guarantees cooperation.
Jining GreenChem Technology Co., Ltd. (简称 Jining GreenChem Cleaning Co.) was established in 2010 and is a specialized company in cleaning various industrial heat exchange equipment. The company possesses comprehensive business philosophy and the capability to research and develop industrial equipment cleaning technology. It undertakes cleaning services for industrial, private enterprises, corporate chemical equipment, power station equipment, condensers of power plants, boilers, and air preheaters of boilers; as well as air conditioning and heat exchange equipment cleaning. It also handles cleaning of machinery and chemical equipment, and deals with descaling of refrigeration and heating equipment.
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Jining Grean Cleaning Co. has dozens of cleaning machines with various models ranging from 10mpa to 250mpa, as well as more than a dozen chemical cleaning pump stations. Our main services include power plants, chemical factories, oil mills, food factories, corporate entities, heating equipment, etc. The company also provides long-term industrial heat exchanger cleaning and solution design services for industry clients.
Our company has newly acquired domestic cleaning machines and imported cleaning equipment. We have hired experienced technical specialists in the cleaning industry, which has enabled the cleaning of heat exchange equipment to be standardized and standardized.
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Chemical descaling process:
Recirculating Closed Loop Cleaning
Recirculating cleaning utilizes two existing parallel deslagging pipelines 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 sludge water pipeline for cleaning. As the acid washing reaches a certain level, the acidic solution is continuously replenished. For short-distance single sludge water pipelines, 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 shut down, and it is complex and costly.
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Open Channel Cleaning
No two ash pipes can form a loop during cleaning; only single-pipe open circuit cleaning is allowed. The method involves connecting one end of the ash pipe to the cleaning unit, continuously preparing a specific concentration of cleaning solution in the dosing tank, and then continuously or intermittently injecting it into the ash pipe. This process requires adding cleaning equipment during shutdown, which increases costs.
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Continuous Operation Cleaning
This process involves continuously injecting a certain amount of acidic solution while simultaneously injecting a specific quantity of ash conveying tube operation cleaning inhibitor and pipeline descaling agent, performing open circuit cleaning. The main function of the cleaning aid is to promote the reaction between the acidic solution and ash deposits at a certain concentration and flow rate, while also increasing its solubility in water, reducing the occurrence of gas blockage, and ensuring the quality of ash pipe cleaning.
Operation method: Before cleaning, first estimate the required acid amount based on the total scale in the pipeline. Then, calculate the acid addition rate and the flow rate of the descaling agent and pipeline stripping agent based on the sludge flow rate and acidity. During cleaning, take a sample 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, take a sample at the end of the sludge pipe every 15 minutes to test the pH value. When the pH value reaches a certain level and remains unchanged for 30 minutes, the cleaning can be considered complete.
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2. High-pressure water jet cleaning machinery
High-pressure water jet cleaning offers advantages such as high efficiency, low cost, non-damaging to workpieces, environmental friendliness, ease of operation, and safety.
The advantages of high-pressure water technology include:
(1) Excellent Cleaning Quality - The high-pressure water jet cleaning of pipes and the inner holes of heat exchangers can completely remove scale and blockages inside, revealing the metal substrate. With immense energy and moving at supersonic speeds, the high-pressure water jet is fully capable of destroying hard scale and blockages without causing any damage to 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.
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(2) Fast Cleaning Speed: Due to the combined actions of jet washing, wedging, shearing, and abrasion, scaling can be quickly broken and removed, which is several to ten times faster than traditional chemical methods, sandblasting, simple mechanical, and manual cleaning methods.
Components cleaned with high-pressure water jetting do not require secondary cleaning; however, after chemical cleaning, the surface chemical agents must be rinsed off with clean water.
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(3) No Environmental Pollution: Since high-pressure water jet cleaning uses clean water as the medium, it does not produce 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 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 clean 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, it can be divided into 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; mixed scale is usually a mixture of the above three types of scales.
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(2) Classified by physical properties, there are two types: hard scale that firmly adheres to the pot shell and tube walls, and loose sediment that is easy to dislodge.
Lime scale primarily forms due to the salts like 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, approximately 2 to 5 times that of ordinary steel. When lime scale forms on the boiler's heating surface, it severely impairs the heat transfer efficiency, affecting the boiler's performance; it can also easily damage metal materials 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 promptly removed using mechanical or chemical methods.
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