Method for descaling heat conduction oil boiler diesel burner

The heat-conducting oil boiler diesel burner with heat-conducting oil as the heat carrier is very popular in the current market. It has the characteristics of high efficiency and environmental protection, so it has been widely used in various industries in recent years. When the boiler diesel combustion engine is used for a long time, the furnace body will become fouled, which greatly affects the thermal efficiency of the boiler diesel combustion engine. Then we will briefly explain the descaling method of the thermal oil boiler diesel burner. The reason for the fouling of the heat-conducting oil boiler diesel combustion engine. The organic heat-conducting oil operates at normal temperature and is not contaminated by external substances in the system. The heat-conducting oil is usually stable. But sometimes the heat transfer oil will overheat and contaminate, leading to the formation of insoluble substances. These insolubles are deposited on the inner surface of the system, making the heat transfer surface scale, and solid deep slag can also cause blockage of system pipes. Dirt will reduce the efficiency of the entire system and increase seal wear. 1. The thermal decomposition of fouling organic heat transfer oil caused by overheating is caused by the temperature of the heat transfer oil exceeding its thermal decomposition limit temperature. For example, due to sudden power outages and other reasons, excessive heat intensity or restricted flow, the heating surface temperature rises above the thermal decomposition limit temperature, and overheating will occur. In this case, cracking thermal decomposition often leads to coking of the heated surface. In the heat transfer oil contaminated by oxidants and impurities, the coking rate is faster. The slag formed by oxidation and corrosion products often reduces the flow rate in the heater, causing the wall temperature to rise, exceeding the temperature limit, and prompting the system to quickly scale. 2. The infiltration of fouling air caused by system pollution into the system will cause the oxidation of the heat transfer oil, resulting in the formation of a large amount of solid dirt in the hot oil system. Usually the infiltration of air comes from an open expansion tank. The heat-conducting oil is oxidized to form insoluble matter at a certain speed, and the formation speed depends on the degree of exposure and temperature of the heat-conducting oil in the air. Corrosion products and rust are often formed due to oxidation and weak acids generated from moisture entering from expansion tanks or other parts. The mixture of corrosion products and oxidized heat transfer oil insoluble matter will be deposited on the surface of the heat exchanger, especially the dead corners and low parts of the system. The hazards of carbon deposits and fouling of the thermal oil boiler diesel combustion engine 1. Factors such as pollution, thermal degradation and polycondensation reaction of the thermal oil, leakage of the oxidation system, residues, corrosion products, overheating, colloidal deposition, volatilization of small molecules, etc. Causes viscosity, total acid value, moisture and acetone insoluble matter to increase, low boiling matter and high boiling matter change and the rate of change is large, causing poor heat transfer speed, pump cavitation, high vapor pressure, system overpressure and pump seal wear , It reduces the oil transportation capacity of oil pipelines, increases frictional resistance, increases transportation energy consumption, and sometimes even causes accidents such as initial condensation and stop flow. 2. A small amount of light components in the heat transfer oil system are discharged through the exhaust line. Light components will cause low pump flow and chain shutdown. Heavy components will cause coking on the inner wall, increase the temperature difference between the inside and outside of the furnace tube, burn through the furnace tube and cause serious safety accidents. Coking or blockage of pipes must be cleaned. 3. Insufficient thermal conductivity will directly affect the quality of the product. 4. The thermal oil boiler diesel burner must be cleaned before changing the oil. If the boiler diesel burner is not cleaned, it will pollute the new oil, reduce its quality and shorten its service life. Therefore, it must be cleaned after coking and fouling of the thermal oil boiler diesel burner. The hazards of inferior heat transfer oil Long-term use of heat transfer oil at high temperatures will lead to poor quality. In this process, the carbon dirt and carbon deposits produced by attaching the heat transfer system to the wall of the heat transfer system will seriously affect the heat transfer system. 1. The coking produced by the heat transfer oil will form a thermal insulation layer, which will increase the exhaust gas temperature, increase fuel consumption, and decrease the heat transfer coefficient (each increase of two carbon pollution on the inner wall of the pipe requires 20% to 30% more fuel); 2 , Carbon deposits and carbon fouling have a certain degree of insulation and heat insulation. After scaling, the temperature rise gradually slows down, which affects work efficiency. After the formation of carbon fouling and coke deposits, the acid value will rise, which will lead to micro-battery corrosion, which will accelerate the damage and aging of the equipment; 3. Due to the uneven thickness of the carbon fouling in the pipe wall, the temperature of the working surface will be uneven. Local overheated gas storage is formed at the bends of the pipeline, causing fuel injection or pipe cracks, resulting in fire; 4. Because the thermal conductivity of the coking layer is smaller than that of steel, the local thermal resistance increases in the coking area, and the radial temperature gradient of the furnace tube Get bigger. The thickest part of the coking layer leads to the appearance of hot spots on the surface of the furnace tube, and the surface temperature of the furnace tube rises, which affects the life of the furnace tube; 5. The coking layer will cause the temperature of the heating furnace tube wall to rise sharply, causing the furnace tube to rupture, bulge, and Burn through the furnace tube, cause the heating furnace to explode and catch fire, causing serious accidents such as personal injury to the operator and equipment. In the technology of applying heat transfer oil as the heat carrier, it is necessary to prevent cracking causing coking. 6. The organic acid produced after the air contacts the heat transfer oil is the oxidation and deterioration of the heat transfer oil. As a result, the polymerization reaction temperature of the heat transfer oil becomes higher and higher, which will increase the degree and speed of oxidation, increase the viscosity of the heat transfer oil, reduce the color and performance, and the mechanical equipment is affected by the oxidation and degradation of the heat transfer oil. The corrosion of organic acids increases the risk of leakage. 7. In the process of working and refining, the heat transfer oil may be mixed with foreign matter. These foreign matter may decompose the heat transfer oil or be a catalyst for the polymerization reaction of the heat transfer oil. Some foreign matter will directly react with the heat transfer oil, causing the deterioration of the heat transfer oil, reducing the performance of the heat transfer oil, or even deteriorating the heat transfer oil, resulting in no heat transfer effect. Cleaning process of heat-conducting oil boiler diesel burner 1. Acid-base cleaning process: Principle: Alkaline water-based cleaning agent has a good effect on the treatment of oily medium-temperature carbon deposits, but there are still dense graphitized high-temperature carbon deposits on the inner wall of the specimen after treatment Therefore, it must be removed by further pickling to prevent the residual carbon layer from affecting the quality of the heat transfer oil and the heat transfer effect. The two-step cleaning process of alkaline washing and acid washing is used for carbon deposition in heat medium furnaces and pipelines, and has the advantages of high cleaning rate, low cleaning temperature, non-toxicity and low cleaning cost. Although this method can remove the scale layer, there are many processes, there is acid-base corrosion, which shortens the life of the machine, and will cause secondary pollution. It must be carried out when the heat transfer oil furnace and light oil burner is stopped, which affects production. 2. Composite cleaning agent cleaning process: Principle: The composite cleaning agent is mainly composed of several surfactants under the synergistic effect of the builder. Firstly, it adsorbs on the grease surface to make it wet and swell, and then the cleaning agent penetrates into the grease gap to make the grease stain. Under the action of the compound cleaning agent, the substance is gradually crimped into micelles and continuously emulsified, and the dispersed and emulsified oily dirt can be separated from the heat transfer surface by the continuous circulation of the pump. This cleaning agent can effectively break and disperse carbon deposits, but also dissolve organic hydrocarbons efficiently. The process is simple and basically non-corrosive to the equipment, but this method will cause secondary pollution and must be cleaned when the machine is stopped, which affects production. 3. Solvent oil cleaning process: Principle: Because coke scale is a kind of complex mixed dirt mainly composed of organic matter, the adhesion to the metal surface is mainly the physical adsorption of van der Waals force. The 'dissolving washing method' is adopted to dissolve the tar. In an organic solvent, it is naturally removed as the organic matter is dissolved. The cleaning ability of the cleaning agent is quite strong and is not greatly affected by temperature. After cleaning, the cleaning agent is clarified and filtered, and then an appropriate amount of surfactant and auxiliary agent can be added for repeated use. Residues can be mixed into coal for combustion, which reduces costs and environmental pollution. However, the cleaning agent is volatile and costly. 4. On-line additive cleaning process: Just add additives to the running heat transfer oil to peel off the carbon deposits, and then filter the oil residue in the system through the filter device carried by the heat transfer oil burner light oil burner. To the role of online cleaning. Principle: Additives can capture the coking groups of aromatic hydrocarbons and hydrocarbon chain dehydrogenation cracking and condensation reactions, and inhibit the deterioration and coking of heat transfer oil. In addition, certain components in the additives clean and disperse the heavy components of coking and fused-ring aromatic hydrocarbons after being dehydrogenated in the system, making them liquefy and peeling from the metal surface. 5. On-line repair and regeneration process: Add additives to the running heat transfer oil system and cooperate with the KD-L100 heat transfer oil repair machine to realize online repair and regeneration of heat transfer oil through the dual effects of chemistry and physics. Principle: This additive uses the principle of similar compatibility to wash away or degrade tar dirt and prevent the deterioration of heat transfer oil. This method is used for cleaning without stopping the machine. The additives can withstand high temperatures above 260°C, and are dissolved in the heat transfer oil without affecting the chemical properties of the heat transfer oil. The amount of heat-conducting oil repair agent cannot exceed 1% of the capacity of the heat-conducting oil. This method is simple in process, cost-saving, and the heat-conducting oil after removing the oil residue can be reused without polluting the environment. It is the trend of chemical cleaning to clean the heat-conducting oil pipeline. (For more serious systems, it is recommended to add part of the thermal oil online cleaning agent, the amount should not exceed 3% of the thermal oil capacity). Precautions for the cleaning of the heat-conducting oil boiler diesel burner The cleaning time of the heat-conducting oil boiler light oil burner is determined: 1. It is found that the internal carbon deposits are serious. 2. The pressure difference between the inlet and outlet of the heat-conducting oil burner and the light oil burner exceeds the equipment's specified value. 3. The heat-conducting oil is obviously blackened and polluted seriously. 4. Thermal oil residual carbon, acid value, viscosity, flash point, ignition point, distillation range and other technical indicators, where two or more phases exceed the standard value of thermal oil by more than 15%. 5. Before replacing the heat-conducting oil with the light oil burner of the heat-conducting oil furnace. The cleaning and replacement of heat transfer oil: the cleaning and replacement of heat transfer oil and the oil transportation production bring safety hazards. Therefore, when the heat-conducting oil of the oil furnace reaches the scrap standard, it must be replaced in time and the heat-conducting oil system should be thoroughly cleaned to extend the service life of the oil furnace. 1. Cleaning of the heat transfer system after the heat transfer oil is discharged from the system: When the heat transfer performance is reduced due to fouling, or the solid content in the heat transfer oil is too high for ordinary filtration, chemical removal of system components is effective. The sludge and sediment are decomposition products of metal oxides and thermal oil. Metal oxides can generally be dissolved or decomposed by acid solution and chelating agent. Before adding acid or lye, solvent can be used to remove the heat transfer oil in dirt deposits and sludge. 2. Cleaning of the heat transfer system when the heat transfer oil is in the system: If the heat transfer oil is only slightly oxidized, the solids can often be removed through the bypass filter. Filtration can be performed in several filters capable of removing nominal particles of 100 μm or smaller at low temperatures. When the system is running, the heat transfer oil can be filtered by bypassing several filter cartridges wound by glass fiber. The causes of insoluble matter, such as overheating and pollution, must be eliminated to ensure normal system operation in the future. When the bypass is equipped with a 10μm glass fiber filter, keep the system clean. In addition, the thermal oil system can be mechanically cleaned. When the formed insoluble substances completely block the system, produce hard blockages or form hard coke on the heater surface, mechanical cleaning methods should be used to remove hard coke. The methods used are: insert steel-wound pressure-resistant rubber pipes into the system equipment, such as high-pressure water spray pipes, steam spray guns, mechanical scraping, or use high-efficiency nitrogen pumps to send high-speed shot blasting or sand blasting into the pipeline for removal. The latter method is more effective. Heating is usually done by high temperature steam-air decoking method. In many cases, the main components of the system must be cleaned by mechanical cleaning technology. ! If you are interested in diesel combustion engines, please contact us for a quote!