Clean various heat exchangers, condensers, industrial pipelines, boilers, and steam power plant condensers — Grange Chemicals, your reliable partner.

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 has comprehensive business philosophy and the capability to research and develop industrial equipment cleaning technology. We undertake cleaning services for industrial, private enterprises, corporate chemical equipment, power plant equipment, 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 the cleaning of refrigeration equipment and heating equipment to remove scale.

Jining Green Cleaning Co. stocks dozens of cleaning machines in various models ranging from 10MPa to 250MPa, and over a dozen chemical cleaning pump stations. We primarily serve power plants, chemical factories, oil mills, food factories, corporate entities, and heating equipment, among others. The company also offers 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 achieve standardized and standardized cleaning of heat exchange equipment.

Chemical Cleaning Scale Removal Process

Recirculating Closed Circuit Cleaning

Recirculating cleaning utilizes two original parallel deslagging pipelines to form a circuit, creating a recirculation system with the cleaning pump station. A solution of a certain concentration of acidity is added, and it circulates within the sludge water pipelines for cleaning. As the acidity washing decreases to a certain level, acid is continuously replenished. For short-distance single sludge water pipelines, if conditions permit, a temporary pipeline can be laid to form a recirculation circuit for cleaning. This process must be carried out when the system is offline, and it is complex and costly.

Open road 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 liquid tank, and then injecting it into the ash pipe continuously or intermittently. This process requires additional cleaning equipment during shutdown, which increases costs.

Continuous operation cleaning

The process involves continuously injecting a certain amount of acidic solution while the ash pipe is operating normally without interruption, simultaneously adding a specific quantity of ash pipe operation cleaning inhibitor and pipeline descaling agent, and conducting an open-circuit cleaning. The main 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 formation of air blockages, and 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 for the sludge pipe operation, including the addition of cleaning and corrosion inhibitor. 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, 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 considered complete.


2. High-pressure water jet cleaning machinery
High-pressure water jet cleaning is efficient, cost-effective, non-damaging to workpieces, environmentally friendly, easy to operate, and safe.
High-pressure water technology offers the following advantages.

(1) Excellent Cleaning Quality: The high-pressure water jet cleaning of pipe and heat exchanger bores can completely remove scale and blockages inside, revealing the metal substrate. With its immense energy and ultra-sonic speed, the high-pressure water jet is fully capable of destroying hard scale and blockages, yet it 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) Rapid Cleaning Speed - Due to the combined effects of jet washing, splitting, shearing, and abrasive cutting from the water jet, scaling can be quickly broken and removed, making the cleaning speed several to ten times faster than traditional chemical methods, sandblasting and shot peening, simple mechanical, and manual methods.

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

(3) No Environmental Pollution: Since high-pressure water jet cleaning uses pure water as the medium, it does not generate large amounts of dust like sandblasting or simple mechanical cleaning, which can pollute the atmosphere and harm health. It also does not produce large volumes of waste liquid like some chemical cleaning methods, which can contaminate rivers, soil, and water quality. The water jet cleaning using pure water is odorless, tasteless, and non-toxic. After atomizing the spray, 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, they can be categorized into carbonate scale, sulfate scale, silicate scale, and mixed scale. 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: a hard scale that firmly adheres to the pot shell and tube walls, and a loose sediment that is easy to dislodge.
Lime scale primarily forms due to the salts containing 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, around 2 to 5 times that of ordinary steel. The accumulation of lime scale on the boiler's heat transfer surface greatly worsens the heat transfer efficiency, affecting the boiler's performance; it can easily lead to the deterioration of metal materials due to localized overheating, potentially causing pipe burst accidents; it also accelerates galvanic corrosion, leading to pipeline lime scale corrosion and speeding up the damage to the heat transfer surface. Once lime scale forms, it should be removed promptly using mechanical or chemical methods.

Heat Exchanger & Refrigeration Equipment Cleaning - Choose GreenChem for Confidence