Clean all types of heat exchangers, condensers, industrial pipelines, boilers, and power plant equipment condensers. Grean Chemical Co., Ltd. offers reliable collaboration.

Jining Grean Chemical Technology Co., Ltd. (简称 Jining Grean Cleaning Co.) was established in 2010 and specializes in cleaning various industrial heat exchange equipment. The company boasts comprehensive business philosophy and the capability to research and develop industrial cleaning technologies. We undertake cleaning services for industrial, private enterprise, corporate chemical equipment, power station equipment, power plant condensers, boilers, and boiler air preheaters; as well as air conditioning cleaning, heat exchange equipment cleaning, and cleaning of mechanical and chemical equipment. We also handle cleaning of refrigeration and heating equipment to remove scale.

Jining Green Cleaning Company stocks dozens of cleaning machines in various models ranging from 10mpa to 250mpa, as well as more than a dozen chemical cleaning pump stations. Our primary services include power plants, chemical factories, oil refineries, food processing plants, corporate entities, heating equipment, etc. The company also provides long-term industrial heat exchanger cleaning and solution design services to clients in the industry.

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 pipelines to form a loop, creating a circulation 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 decreases to 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 offline, and it is complex and costly.

Open Channel Cleaning

No two grey pipes should form a loop during cleaning; only a single grey pipe should be used for open-loop cleaning. The method involves connecting one end of the grey pipe to the cleaning unit and continuously preparing a certain concentration of cleaning solution in the mixing tank, then injecting it into the grey pipe continuously or intermittently. This process requires adding cleaning equipment during shutdown, which increases the cost.

Continuous operation cleaning

The process involves continuously injecting a specific quantity of acidic solution while simultaneously introducing a certain amount of slurry pipe operation cleaning inhibitor and pipeline descaling agent for open circuit cleaning. The main function of the cleaning additive is to facilitate the reaction between the acidic solution and scale deposits at a certain concentration and flow rate, while also increasing its solubility in water, reducing the formation of air blockages, and ensuring the quality of the ash pipe cleaning.

The procedure is as follows: First, estimate the required acid amount based on the total scale in the pipeline before cleaning. Then, calculate the acid addition rate and the flow rate of the ash removal agent and pipeline cleaner by considering the flow rate of the sludge water and the acidity. During cleaning, collect samples at the front sampling point of the ash pipe every 30 minutes to test the acidity and strictly control it by adjusting the acid flow rate. In the later stage of 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 process can be considered complete.


2. High-pressure water cleaning equipment:
High-pressure water jet cleaning offers high efficiency, low costs, non-damaging to workpieces, environmental protection, ease of operation, and safety advantages.
Advantages of high-pressure water technology include:

(1) Excellent Cleaning Quality - During high-pressure water jet cleaning of pipelines and the inner holes of heat exchangers, it can completely remove scale and obstructions from inside the pipes, revealing the metal substrate. The high-pressure water jet, with its immense energy and supersonic movement, is fully capable of destroying tough scale and obstructions without causing any damage to the metal.

High-pressure water cleaning will not damage the base material being cleaned, as the pressure is less than the compressive strength grade of the metal.

(2) Rapid Cleaning Speed: Due to the combined actions of water jet abrasion, wedging, shearing, and grinding, scale can be quickly shattered and removed, making the cleaning speed several to tens of times faster than traditional chemical methods, sandblasting, ball-blasting, simple mechanical, and manual methods.

Parts cleaned with high-pressure water jetting do not require secondary cleaning; however, after chemical cleaning, the surface chemical must be rinsed off with clear water.

(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, grit-blasting, or simple mechanical cleaning, which can pollute the atmosphere and harm health. It also does not generate a large 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, 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, thus causing no 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: 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, magnesium, and other minerals 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 also cause metal materials to burn out 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.

Heat Exchanger and Refrigeration Equipment Cleaning - Choose GreenChem for Confidence