Clean various heat exchangers, condensers, industrial pipelines, boilers, and steam power plant condensers. Glan Chemicals offers guaranteed cooperation.
Jining Grean Chemical Technology Co., Ltd. (Abbreviated as 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. It undertakes cleaning services for industrial, private enterprise, corporate chemical equipment, power plant equipment, condensers, boilers, and boiler air preheaters; air conditioning cleaning, heat exchange equipment cleaning, and mechanical and chemical equipment cleaning. It also handles cleaning and descaling of refrigeration and heating equipment.
Jining Grean Cleaning Co. has 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 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 original 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 within the ash water pipeline 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 during shutdown and is complex and costly.
Pilot 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 mixing tank, and then continuously or intermittently injecting it into the ash pipe. This process requires the addition of cleaning equipment during shutdown, resulting in higher costs.
Continuous Cleaning Without Shutdown
The process involves continuously injecting a certain amount of acidic solution while operating the ash conveying pipes, simultaneously introducing a specific quantity of ash conveying pipe cleaning inhibitor and pipeline descaling agent for open-loop cleaning. The primary function of the cleaning additive 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 formation of air blockages, 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 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 deemed complete.
2. High-pressure water jet cleaning machinery
High-pressure water jet cleaning offers advantages such as high efficiency, low cost, non-damaging to workpieces, non-polluting the environment, easy operation, and safety.
Advantages of high-pressure water technology include:
(1) Excellent Cleaning Quality: High-pressure water jet cleaning of pipes 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 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) Fast Cleaning Speed: Due to the combined effects of water jet flushing, wedging, 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.
Components cleaned with high-pressure water jetting do not require secondary cleaning; however, after chemical cleaning, the surface chemicals must be rinsed off with clean water.
(3) No Environmental Pollution: Since 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 significant amount 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, 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, 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; mixed scale is usually a mixture of the above three types of scales.
(2) Classified by physical properties, there are two types: scale that is firmly adhered to the pot shell and pipe walls, and sediment that is loosely textured and easy to detach.
Lime scale primarily forms due to the salts of 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 on the boiler's heating surface greatly deteriorates heat transfer efficiency, affects boiler performance; it can easily cause metal materials to burn due to localized overheating, even leading to tube bursting 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 & Refrigeration Equipment Cleaning – Choose Green Chemicals for Assurance
