Is the heat-conducting oil boiler diesel burner dangerous?

　　The heat transfer oil boiler diesel burner is to insert the heating element directly into the heat transfer oil, and use the circulating pump to heat the oil. The heat transfer oil circulates in the liquid phase to transfer heat to the heating equipment. Compared with the traditional steam boiler diesel burner, it has a certain degree of safety. However, if the heat-conducting oil boiler light oil burner operates in violation of regulations for a long time or lacks maintenance for a long time, safety accidents will still occur. Therefore, the daily maintenance and maintenance of the heat-conducting oil boiler diesel burner is particularly important. So let's briefly explain below. Analysis of safety accidents of heat-conducting oil boiler diesel burners are classified according to the degree of equipment damage 1. Explosion accident guidance The hot oil boiler diesel burner and heat transfer system suddenly rupture during operation, so that the pressure in the boiler diesel burner or system will instantly reach the outside world Atmospheric accident. It is easy to cause a fire or a secondary explosion, causing serious damage to the plant and equipment, as well as casualties. 2. Severe damage accident refers to the serious damage to the internal system components of the boiler diesel combustion engine and heat transfer system, which must be stopped for maintenance. 3. General damage accident refers to the accident classification caused by the heat transfer oil that can be repaired without stopping the operation 1. Accidents caused by inferior heat transfer oil; 　　2, accidents caused by serious deterioration of the heat transfer oil in use; 　　3, personal injury accidents caused by high temperature injection from the expansion tank; 　　4, fire accidents caused by system leakage; 　　5, due to water pollution in the system Causes an overpressure explosion accident; 　　6, due to overheating caused rapid deterioration of the heat transfer oil and scrapped; 　　7, accidents caused by contamination of the heat transfer oil.　　Analysis of common accident causes of thermal oil boiler diesel burner 　　 1. Due to the over-temperature and over-pressure operation of the thermal oil boiler diesel burner, coking in the pipeline causes the furnace tube to rupture, and the leaked thermal oil enters the furnace, causing a fire and explosion.　　2. Leaks in connection parts such as flanges and valves or seals in the system have not been solved in time, and open flames may cause fires.　　3. The leakage of heat transfer oil into the insulation layer of the pipeline has not been discovered in time. After being accumulated in the insulation layer, it will gradually oxidize and produce components with low spontaneous ignition point and cause spontaneous combustion.　　4. In some chemical companies, the heated materials contain oxidizers or active oxidizers. If heat transfer oil leaks into these materials, it may cause violent combustion or even explosion.　　5. If the temperature in the high-level tank is too high for the open operation system, the heat transfer oil will be easily oxidized when it contacts the air, and some oxidation products will cause spontaneous combustion.　　6. ​​If the heat transfer oil system is contaminated by water, it will cause overpressure injection due to its rapid expansion after vaporization, causing high-temperature oil injection to hurt people, catch fire, or even overpressure explosion.　　7. There is a problem with the quality of the selected heat transfer oil, or the thermal stability does not match the process, and does not match the design requirements of the boiler diesel burner. When the system is running, the actual liquid film temperature in the furnace tube exceeds the maximum allowable liquid film temperature of the heat transfer oil, causing the decomposition and polymerization of the oil, premature deterioration and deterioration, and indicators such as residual carbon, viscosity, and acid value are all exceeding the standard.　　 8. Sudden power failure or failure to circulate cooling according to regulations when the furnace is shut down, so that the heat transfer oil stagnates in the high temperature furnace tube and causes overheating.　　9. Improper use of the filter results in the failure of coking and sticky substances to be filtered out, depositing charcoal on the bottom of the pot or the wall of the pipe.　　10. Over-temperature operation promotes a large amount of thermal oil cracking, producing low-boiling substances and vaporizing in the system, causing cavitation in the circulation pump and vibration of the pipeline, and causing leakage in tight parts.　　11. Adding new heat transfer oil to the system fails to remove the water in time, or the heat transfer oil heats up too fast, causing rapid volume expansion, and the high tank liquid level is too high, causing the heat transfer oil to spray out.　　12. Due to the unreasonable design or configuration of the boiler diesel burner and system, the flow rate of the heat conduction oil in the boiler diesel burner tube is too low, which causes the oil to overheat and deteriorate, and it is easy to coke and deposit in the furnace tube and burn the furnace tube. Handling and prevention of emergencies of heat-conducting oil boiler diesel burner 1. Hidden hazards caused by the deterioration of heat-conducting oil quality. Prevention of premature deterioration of heat-conducting oil quality caused by poor production process operation and management. It is the easiest way for electric heating heat-conducting oil burners One of the problems that has occurred is that some heat transfer oils have severely deteriorated performance indicators after only one or two years of use. For long-term operation of poor quality heat transfer oil, carbon deposits on the tube wall on the heating surface continue to increase, the inner diameter of the tube decreases, and the flow rate of the heat transfer oil continues to decrease. The resistance of the circulating pump gradually increases, and the heat transfer efficiency continues to decrease. Vicious accidents such as overburning, deformation, and pipe bursting.　　One of the reasons for the deterioration of the quality of the heat transfer oil is thermal cracking due to local overheating, and the second is the oxidation of the heat transfer oil. If the heat transfer oil exceeds its maximum use temperature, it will locally overheat, produce thermal decomposition and condensation, precipitate residual carbon, decrease the flash point, darken the color, increase the viscosity, decrease the heat transfer efficiency, and coke and age. The heat-conducting oil contacts with oxygen in the air to produce an oxidation reaction, generate organic acid and polycondensate into a cement, which increases the viscosity, which not only reduces the service life of the medium, but also causes acid corrosion of the system. At present, the quality standards set by various domestic heat transfer oil factories are different, and the quality of the heat transfer oil produced is also quite different. For the heat transfer oil in use, the 'Organic Heat Carrier Furnace Safety Technical Supervision Regulation' stipulates that the kinematic viscosity, flash point, residual Carbon and acid value should be tested at least once. 2. The hidden danger of automatic control system failure. At present, the current status of the domestic heat transfer oil electric heater technology is that the heat transfer oil control system uses a programmable controller to control PLC as the control core. For a certain temperature of heat transfer oil, under the working pressure of the circulating pump Entering from the inlet of the heater, the heat-conducting oil passes through the heating cavity of the heater to gradually increase the temperature, and then flows out from the outlet, so that the heat-conducting oil reaches the required process temperature, so that the degree of automation of the equipment is further improved. In the control system, the heat transfer oil is sent to the entire system through the gear pump. When the set magnetic turning column liquid level controller reaches the specified liquid level, the gear pump is automatically shut down, and the circulating pump and electric heater are started at this time to start heating , When the outlet oil temperature reaches the set value, it enters the user system cycle, and the oil used by the equipment enters the device for heating again, and the cycle runs again and again, which is the working state of the heat transfer oil.　　 These automatic control systems are effective checkpoints to ensure the safe operation of the light oil burner of the electric heating heat-conducting oil furnace, and these checkpoints are often those that often fail due to weak safety awareness or economic reasons in actual operation. 3. The hidden dangers of air and moisture entering the air and moisture are easy to enter during the new refueling, oil change and maintenance process of the light oil burner of the electric heating heat transfer oil furnace. During the heating process, the air expands and the moisture evaporates, and its volume changes far. It far exceeds the thermal expansion of the heat transfer oil itself. When the relative pressure is zero, the volume expansion when the water evaporates is about 1600 times its original volume, and the air expands about 5 times when the temperature is raised to 270°C. If these air and moisture cannot be discharged in time, it will inevitably increase the operating pressure and seriously threaten the safety of the system. Therefore, the moisture and other components in the heat transfer oil should be strictly controlled. During the heating start process, the exhaust valve should be opened repeatedly to exhaust the air, water and heat transfer oil mixed steam in the system, and pay attention to controlling the heating speed of the heat transfer oil. 4. Leakage hazards between pipe flanges or valves. Pipe flanges or valve joints are the most vulnerable parts of the heat transfer oil system. Because heat transfer oil has the characteristics of easy penetration and combustibility, especially for heat preservation made of porous materials The layer has stronger adhesion. If the heat transfer oil leaks and cannot be found in time, it is easy to cause a fire. Therefore, it is necessary to check the integrity of the flange and the valve connection regularly, and replace it in time if damaged. From the deactivation of the light oil burner of the heat transfer oil furnace to the operation process, due to the large temperature change, the flanges are easy to loosen, and there is often leakage. At this time, attention should be paid. All seals in the piping system should be made of flexible and metal-wound products with good sealing and flame retardancy, and seals containing rubber components should not be used. The insulation material should be made of materials with small voids and not easily impregnated by the organic heat carrier to prevent the leakage of the organic heat carrier from causing the insulation layer to catch fire.　　5. Hidden dangers of coking and carbonization of electric heating rods　　 When the heating rod is used to heat the heat transfer oil, the surface of the heating rod will quickly become coked and charred, which will eventually cause the electric heating rod to burn and the heat transfer oil will be scrapped. The cause of serious carbon deposition can be analyzed by heat transfer calculation: 　　 Take 220V4kW electric heating rod as an example, the surface area is 0.125㎡, the heat transfer coefficient K=67-114W/℃·㎡ under natural convection, the larger value K=114W /℃·㎡.　　According to the calculation of Q=KF△t, the electric heating rod must transfer 4kW of heat to the heat transfer oil, and the temperature difference between the surface of the rod and the heat transfer oil must be greater than 275℃. When the average temperature of the heat transfer oil is 300℃, the surface temperature of the rod must reach 575℃. The allowable film temperature (equivalent to the surface temperature of the rod here) of the heat transfer oil in the heating furnace tube with the highest allowable temperature of 340℃ shall not exceed 370℃. Now that the heat transfer oil is in contact with the surface of the rod at 575°C, coking and carbonization must be serious, and the life of the heat transfer oil is also very short.　　The way to prevent serious carbon deposition on the surface of the heating rod is to increase the surface area of ​​the heating rod so that the heat load on the surface of the rod is limited to an appropriate range. By calculation, the two 2kW resistance wires connected in parallel in the 4kW electric heating rod are changed to be connected in series. When the terminal voltage is 220V, the total power of the resistance wires is 1kW. The surface area of ​​the electric heater is still 0.125m2, and the temperature difference required for heat transfer is 69°C. Similarly, when the average oil temperature is 300°C, the surface temperature of the heating rod is 369°C, and 1kW of heat is transferred to the heat transfer oil. 369°C is close to the allowable film temperature of 370°C for thermal oil, which may relieve the coking problem. The best solution is to design and manufacture special electric heating rods to increase the surface area so that the surface temperature is lower than the allowable liquid film temperature of the heat transfer oil.　　Daily maintenance of the thermal oil boiler diesel burner　　1. Daily maintenance should be carried out. The inspection, cleaning and lubrication of the thermal oil burner and light oil burner should be done, and data records should be made.　　2. The secondary maintenance should be performed once after three months of operation of the light oil burner of the heat transfer oil furnace.　　 3. Overhaul and maintenance should be carried out once a year, or according to the specific conditions of the inspection.　　4. Before carrying out overhaul and maintenance, conduct a comprehensive inspection of the heat-conducting oil furnace light oil burner, and determine the key points of overhaul and maintenance according to the actual situation obtained.　　 5. Special personnel should be assigned to be responsible, and the pision of labor and responsibilities should be established to ensure the quality of maintenance work.　　6. ​​Before overhaul and maintenance, materials, tools and parts to be used should be prepared, and records should be made. After the overhaul, the acceptance work should be done. The cleaning method of the heat-conducting oil boiler diesel combustion engine 1. Drain the old oil: use the heating system to heat the heat-conducting oil to 70-80℃, and drain all the heat-conducting oil in the system while it is hot. The oil is released as much as possible, and the cleaning agent that cannot be released will be discharged out of the system after the oil is thinned by penetration, stripping, and dissolution. 2. Pre-washing: After measuring and dissolving the cleaning agent according to 1.5% of the total circulating water, put it into the system at any part of the heating system, fill the system with clean water, turn on the circulating pump to circulate, and use the heating furnace to raise the water temperature To 60°C±5°C, switch the relevant valve of each reactor in the system to make all parts in the system circulate separately. After three to five hours, open all low drain valves of the system to drain the water from the system. 3. Cleaning: Dissolve the cleaning agent according to 4.5~6.5% of the total circulating water, put it into the system at any part of the heating system, and fill the system with clean water, turn on the circulating pump to circulate, and use the heating furnace to heat Clean the agent to 90℃±5℃. Switch the valve of the system so that all parts in the system can be cleaned. It is advisable to switch the valve every hour. The entire cleaning time is not less than 24 hours.　　4. Washing ①: Fill the system with clean water, turn on the circulating pump to circulate, use the heating furnace to raise the water temperature to 90℃±5℃, switch the relevant valves in the system, so that all parts in the system are circulated separately. Rinse the system. After three hours, open all the low-position drain valves of the system to drain the water in the system. 5. Water washing ②: Fill the system with clean water again, turn on the circulating pump to circulate, use the heating furnace to raise the water temperature to 90℃±5℃, switch the relevant valves in the system, and make all parts of the system circulate separately . Rinse the system. After three hours, open all the low-position drain valves of the system to drain the water in the system. 6. Water washing ③: Fill the system with clean water, turn on the circulating pump to circulate, use the heating furnace to raise the water temperature to 90℃±5℃, and rinse the system. After three hours, open all the low-level drain valves of the system. Drain the water in the system. After the discharge is completed, compressed air can be used to purge the remaining water in the system until it is exhausted according to the conditions.　　7. Add new oil: Inject new heat transfer oil into the system.　　 8. Dehydration: The dehydration method is equivalent to the dehydration standard before the new system is used.　　 9. Normal operation: The system is put into normal operation. ! If you are interested in diesel combustion engines, please contact us for a quote!