The descaling and maintenance method of heat-conducting oil boiler diesel burner

The thermal oil boiler diesel burner is the most popular type of heating boiler diesel burner on the market. Compared with the traditional boiler diesel burner varieties, it will be more safe and environmentally friendly. After the thermal oil boiler diesel burner is used for a period of time, if you want to better ensure the safe and stable operation of the boiler diesel burner, it needs to be descaled and maintained, otherwise it will affect the safe use and thermal efficiency of the boiler diesel burner. Have a great impact. So let's briefly explain below. Causes of carbon deposition and fouling in the diesel burner of the heat-conducting oil boiler: Carbon deposit: The light-oil burner of the heat-conducting oil boiler is easily oxidized during the heating process. Under high temperature, the acid value of the oil increases, the kinematic viscosity gradually increases, and the residence time is longer. Therefore, cracking and thermal condensation reactions occur. After cracking, small molecules are generated, which volatilize at the same temperature, and the thermal polycondensation reaction produces polymer products, which increases the viscosity of the oil, thereby causing carbon deposits in the pipeline and equipment, affecting the heat transfer effect, and accelerating the burning of light oil in the heat transfer oil furnace Machine aging failure. It may also cause local overheating of the furnace body pipe, damage the mechanical strength, and endanger personal safety in severe cases. Scaling: The heat transfer oil burner and the light oil burner produce glue while transferring heat. The glue adheres to the inner wall and is easy to form coking. In addition, if air enters, degradation and polymerization reactions are likely to occur, and the solubility of the formed high boilers in the heat-conducting oil furnace and light oil burner will reach a supersaturated state, thus forming coking. The operating temperature exceeds the design temperature of the heat-conducting oil furnace and the light oil burner itself, and the contamination of corrosion products and impurities will cause the inner wall of the tube to form coking. The hazard of carbon deposits and scaling inside the heat-conducting oil boiler diesel combustion engine A small amount of light components in the heat-conducting oil system can be discharged through the exhaust line, but if there are too many light components, it will cause a low pump flow rate and interlock the furnace. Too many parts will cause the internal coking of the furnace tube to reduce the heat transfer rate of the furnace tube. The thermal efficiency of the hot oil furnace is reduced, resulting in energy waste, and the temperature difference between the inside and outside of the furnace tube increases. When the outer wall temperature of the furnace tube reaches 600~700℃, it is easy to burn through Furnace pipes, causing fire accidents, equipment damage, and even casualties. Coking is the enemy of hot oil furnaces and the bane of fire. Avoiding hot oil furnace coking is a problem worth studying. Because of the heat transfer oil The solution to the above shortcomings is usually cleaning and descaling. The effect of heat transfer oil on carbon deposition and fouling. Heat transfer oil is generally pided into two types: mineral type and synthetic type. Mineral type is part of the high-boiling fraction extracted from petroleum refining, which becomes heat transfer oil after adding antioxidants. Synthetic heat transfer oil is usually a mixture of several isomers or similar chemical substances. The components of heat transfer oil include biphenyl, naphthalene, diphenyl ether and their low melting point mixtures. Common types are alkylbenzene type, alkyl naphthalene type, alkyl biphenyl type, biphenyl plus diphenyl ether mixed type, hydrogenated Terphenyl type, benzyl toluene type, heavy alkyl benzene type, silicone type, mineral oil type. Coking (coking) of heat transfer oil-going through two processes 1. Oxidation process: heat transfer oil is easily oxidized during heating. The acid value of the oil increases at high temperature, its kinematic viscosity gradually increases, and the residence time is longer, so cracking occurs And thermal condensation reaction. 2. Cracking process: After oxidation, cracking begins-small molecules volatilize, thermal polycondensation reaction produces polymer products, oil-water imbalance, resulting in an increase in oil viscosity, resulting in carbon deposits inside pipelines and equipment. Reasons for the fouling of heat transfer oil 1. The heat transfer oil produces colloid while transferring heat energy. The colloid adheres to the inner wall and is easy to form coking. 2. If air enters, degradation and polymerization reactions are likely to occur, and the solubility of the formed high boilers in the heat transfer oil will reach a supersaturated state, thereby forming coking. 3. The operating temperature exceeds the design temperature of the heat transfer oil itself, and the corrosion products and impurities will cause the inner wall of the tube to form coking. Once the heat transfer oil has carbon deposits and coking, the heat transfer effect will gradually decrease and become invalid due to aging. It may also cause partial overheating of the furnace body pipe, which will damage the mechanical strength, and cause the oil pipe to burst and leak/explode in severe cases, endangering personal safety. Therefore, it must be cleaned and replaced when carbon deposits and coking occur. At the same time, choosing the heat transfer oil with reliable quality and meeting temperature requirements and daily standard operation is the most important thing. Insufficiency of heat transfer oil The heat transfer oil is easy to be oxidized during the heating process, and the acid value of the oil increases at high temperatures and the rate of change is greater. Its kinematic viscosity gradually increases, which is due to the thermal cracking and heat generation of the heat transfer oil components at high temperatures. Polycondensation reaction. The result of thermal cracking reaction results in the formation of small molecular compounds, which reduces its viscosity; while thermal polycondensation reaction generates polymer products, which increase its viscosity. Small molecular compounds have a small amount of volatilization, and the overall result increases the viscosity of the oil. See Table 2. The amount of residual carbon increases with the increase of temperature. When the operating temperature is between 300 and 400 ℃, thermal cracking is likely to occur, and carbon deposits are formed on the inner wall of the pipeline and equipment, which affects the heat transfer efficiency, accelerates the aging and failure of the conductive oil, and also makes the furnace The body and the pipeline are locally overheated, which damages the mechanical strength and endangers personal safety. The fouling of the heat transfer oil in the pipe guide reduces the circulation area of ​​the oil pipeline to varying degrees, increases the frictional resistance, increases the energy consumption of transportation, and reduces the transportation of the pipeline. Oil capacity, and sometimes even lead to accidents such as initial condensation and stop flow. In addition, the grease and coke generated by the heat transfer oil can increase the thermal resistance of the pipe wall, increase the energy consumption of the production process, shorten the life of the equipment, and the scale layer also reduces the inner diameter of the equipment. , The material flow pressure drop increases, the yield decreases, the operation cycle is shortened, and the production is seriously affected. The chemical descaling method of the heat-conducting oil boiler diesel burner 1. The two-step process of alkaline washing and pickling: discharge heat transfer oil → steam purging Stagnant oil→alkaline cleaning agent→water washing→pickling→passivation→completed. Principle: The 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, so it must be removed by further acid washing to avoid the influence of the residual carbon layer The quality and heat transfer effect of heat transfer oil. 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. The process of dissolving cleaning method: discharging heat transfer oil → steam purging stagnant oil → cleaning with organic solvent cleaning fluid (organic solvent + SAA + auxiliary agent) → passivation. Principle: Because coke scale is a kind of complex mixed dirt with organic matter as the main component, 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 the organic solvent, and the organic matter Dissolve and remove naturally. 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 has volatility, low safety and high cost. 3. Composite cleaning agent cleaning process: discharge heat transfer oil → steam purging stagnant oil → cleaning fluid cycle cleaning. Principle: The composite cleaning agent is mainly composed of several surfactants under the synergistic effect of the builder to adsorb on the surface of the grease stain to make it wet and swell, and then the cleaning agent penetrates into the grease gap so that the grease gradually shrinks under the action of the composite cleaner. The micelles are continuously emulsified and continuously circulated and flushed by the pump to make the dispersed and emulsified oily dirt get off the heat transfer surface. This cleaning agent can effectively break and disperse carbon deposits and efficiently dissolve organic hydrocarbons. The process is simple and basically non-corrosive to equipment. However, this method will cause secondary pollution and must be cleaned while parking, which will affect production. Organic additive cleaning process: only need to add additives to the running heat transfer oil to peel off the carbon deposits and then clarify and filter to remove the oil residue. Principle: This additive uses the principle of similar compatibility to elute tar dirt or degrade tar dirt to 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 ℃ and dissolve in the heat transfer oil without affecting the properties of the heat transfer oil. The amount cannot exceed 5% of the heat transfer oil. When in use, the heat-conducting oil furnace and the light oil burner and the pipeline do not need to be cooled without affecting production. The process of this method is simple and cost-saving. The heat-conducting oil after removing the oil residue can be reused without polluting the environment. This is the trend of chemical cleaning to clean the heat-conducting oil pipeline. The prerequisites for heat conduction oil cleaning. Any quality heat conduction oil boiler diesel burner will produce quality deterioration for a long time at high temperature. During this deterioration process, the carbon pollution and carbon deposits produced by it adhere to the pipe wall to form the following six aspects Hazards: 1. Carbon pollution and carbon deposits have insulation and heat insulation properties, which will cause slow heating after fouling and affect work efficiency. 2. Every additional millimeter of carbon pollution on the inner wall of the tube consumes 20-30% more fuel. 3. Due to the unequal carbon pollution thickness in the pipe wall, the working surface temperature is uneven, which affects the product quality. 4. After the formation of carbon pollution and carbon deposits, the acid value will increase, causing corrosion of the micro-battery, and accelerating the aging and damage of the equipment. 5. Due to long-term non-cleaning, a large amount of carbon deposits and carbon pollution are deposited in the pipe bends, forming local overheated gas storage, causing pipe cracks or fuel injection, causing fires, and boiler diesel burners are scrapped. 6. It is beneficial to the regeneration and adjustment of the light oil burner of the heat-conducting oil furnace, and extends the service life of the light oil burner of the heat-conducting oil furnace and the service life of the light oil burner of the heat-conducting oil furnace. The water-based chemical cleaning agent, which is a special cleaning agent for thermal oil boiler and diesel burner, is a cleaning agent used to clean heavy grease, oil tar, oil sludge and oil stains on the surface of metal machinery in heat transfer oil heat exchange equipment. It is compounded by a variety of high-quality surfactants and organic additives. It has excellent permeability, emulsification and oil coke removal ability, has excellent solubility in water, is simple and convenient to use, and can be soaked and sprayed. Various cleaning methods such as showering and recycling are safe and non-corrosive, and can be discharged directly after use. Features of water-based chemical cleaning agent 1. It has strong ability to remove oil coke and heavy grease, and it can clean the oil in the equipment thoroughly and cleanly without leaving any residue. 2. It has a wide range of applications, which can not only remove oil stains on metal objects, but also can be used to clean non-metal objects. 3. It is safe to use. This product is odorless, non-toxic, non-flammable, non-corrosive to the cleaned objects, has little irritation, does not damage the skin, is safe and non-corrosive to various surfaces, and has a short-term anti-rust effect on metal surfaces. 4. Simple operation. This product can be used directly at room temperature or diluted with water to meet the requirements of dipping, brushing, spraying, scrubbing, ultrasonic cleaning, etc. Precautions for cleaning heat conduction oil boiler diesel burner 1. Dilute the descaling agent and water at a ratio of 1:10 into the boiler diesel burner inlet; 2. Fill the water to the highest water level and wait 4 hours for the descaling agent The solution fully reacts with the scale; 3. Open the sewage outlet and drain the cleaning liquid; 4. Inject clean water and rinse until the water is clear, and the cleaning and descaling work is completed. ! If you are interested in diesel combustion engines, please contact us for a quote!