Clean various heat exchangers, condensers, industrial pipelines, boilers, and steam power plant condensers. Glan Chemicals guarantees cooperation.

Jining Green Chemical Technology Co., Ltd. (abbreviated to Jining Green Cleaning Co.) was established in 2010 and is a professional company specializing in cleaning various industrial heat exchange equipment. The company has the capability to develop complete business concepts and industrial equipment cleaning technologies, undertaking cleaning services for industrial, private enterprises, corporate chemical equipment, power plant equipment, condensers in power plants, boilers, and economizers. We also handle air conditioning cleaning, heat exchange equipment cleaning, and mechanical and chemical equipment cleaning. In addition, we offer cleaning and descaling services for refrigeration and heating equipment.

Jining Grean Cleaning 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 mills, food factories, corporate entities, heating equipment, and more. The company also offers long-term industrial heat exchanger cleaning and design solutions 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 process for heat exchange equipment.

Chemical cleaning scale removal process:

Recirculating Closed Circuit 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 within 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 pipes, 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 gray pipes can form a loop during cleaning; only single-pipe open-loop cleaning is allowed. The method involves connecting one end of the gray pipe to the cleaning unit and continuously preparing a specific concentration of cleaning solution in the dosing tank, then injecting it into the gray pipe continuously or intermittently. This process requires additional cleaning equipment during shutdown, which increases costs.

Continuous Cleaning Without Downtime

The process involves continuously injecting a certain amount of acidic solution while the ash pipeline is operating normally without interruption, simultaneously introducing an ash pipeline running cleaning inhibitor and pipeline cleaning descaler. This is an open-circuit cleaning. The main function of the cleaning aids 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 pipeline cleaning.

The procedure is as follows: Before cleaning, 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 cleaning agent based on the sludge water 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.


2. High-pressure water jet cleaning equipment
High-pressure water jetting is used for cleaning, offering advantages such as high efficiency, low cost, non-damaging to workpieces, non-polluting to the environment, ease of operation, and safety.
The advantages of high-pressure water technology include:

(1) High-quality cleaning - During high-pressure water jet cleaning of pipelines and the internal holes of heat exchangers, all scaling and obstructions within the pipes are thoroughly removed, revealing the metal surface. The high-pressure water jet, with its immense energy and ultra-sonic movement, is fully capable of destroying tough scaling and obstructions 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 being cleaned.

(2) Rapid Cleaning Speed - Due to the combined action of jet washing, wedge splitting, shearing, and grinding, scale can be quickly broken and removed. This process is several to ten times faster than traditional chemical methods, sandblasting, simple mechanical, and manual cleaning 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) 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, 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 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, thus causing no pollution.

Pipe Scale

(1) Classified by chemical composition, they can be categorized 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.

(2) Classified by physical properties, there are two types: scale that firmly adheres to the pot shell and tube walls, and sediments that are loose and easily detachable.
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. The thermal conductivity of lime scale is very low, around 2 to 5 times that of ordinary steel. Lime scale buildup on the boiler's heating surface significantly worsens heat transfer efficiency, affecting the boiler's performance; it can easily damage metal materials due to localized overheating, potentially leading to burst pipe 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.

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