Clean various heat exchangers, condensers, industrial pipelines, boilers, and steam power plant equipment condensers. Greenclean Chemical Co. 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 develop industrial equipment cleaning technologies. We undertake cleaning services for industrial, private enterprise, and corporate chemical equipment, power station equipment, power plant condensers, boilers, and boiler air preheaters; as well as air conditioning and heat exchange equipment cleaning. We also handle the cleaning and descaling of refrigeration and heating equipment.

Jining Green Clean Company stocks dozens of cleaning machines ranging from 10mpa to 250mpa, and over a dozen chemical cleaning pump stations. Our main services are provided to power plants, chemical factories, oil refineries, food processing plants, 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 newly acquired domestic cleaning machines and imported cleaning equipment. We've hired experienced technical experts in the cleaning industry to standardize and regulate the cleaning process of heat exchange equipment.

Chemical Cleaning Scale Removal Process

Recirculating Closed Loop Cleaning

Recirculating cleaning utilizes two existing parallel ash pipelines to form a loop, creating a circulation system with the cleaning pump station. A certain concentration of acidic solution is added, allowing for recirculation and cleaning within the ash water pipeline. As the acid washing reaches a certain level, the acidic solution is continuously replenished. For short-distance single ash 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.

Open Channel 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 certain concentration of cleaning solution in the dosing tank, and injecting it into the ash pipe continuously or intermittently. This process requires the addition of cleaning equipment during shutdown, resulting in higher costs.

Continuous Operation Cleaning

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 running cleaning inhibitor and pipeline descaling agent 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 and reducing the occurrence of airlock, ensuring the quality of ash pipe cleaning.

The procedure is as follows: 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 cleaner by considering the sludge flow rate and acidity. During cleaning, take a sample at the front 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 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 protection, ease of operation, and safety.
Advantages of high-pressure water technology include:

(1) Excellent cleaning quality: The high-pressure water jet cleaning of pipeline and heat exchanger bores can completely remove scaling and blockages from inside the pipes, revealing the metal substrate. The high-pressure water jet, with its immense energy and supersonic speed, is capable of completely destroying hard scaling and blockages, but has no damaging effect on 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 action of jet washing, wedge splitting, 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.

Additionally, parts 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) Non-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 significant amount 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.

Pipe Scale

(1) Classified by chemical composition, it includes 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) Categorized by physical properties, there are two types: scale that is firmly adhered to the pot shell and tube walls, and sediment that is loosely textured and easily detached.
Lime scale primarily forms due to the salts of calcium and magnesium present 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 accumulates on the boiler's heating surface, it significantly worsens the heat transfer efficiency and affects the boiler's performance; it can easily cause metal materials to burn due to localized overheating, potentially leading to pipe explosion accidents; it also accelerates galvanic corrosion, causing pipeline lime scale corrosion and speeding up the damage to the heating surface. Once lime scale forms, it should be promptly removed using mechanical or chemical methods.

Heat Exchanger and Refrigeration Equipment Cleaning - Choose GreenChem for Reliability