Safety of heat conduction oil boiler diesel burner

The thermal oil boiler diesel burner refers to the boiler diesel burner that uses thermal oil for heating. The heat transfer oil, which is usually called medium oil or organic heat carrier, has been used as a heat transfer medium in the industrial field for 50 years. It has the ability to obtain a higher working temperature under extremely low pressure, and can precisely control the temperature of the medium. So how safe is the thermal oil boiler diesel burner? Let's briefly introduce it below. The safety of the heat transfer oil boiler diesel burner The heat transfer oil boiler light oil burner only bears pump pressure, and the heat transfer oil heating system has no explosion hazard, so it is safer; the organic heat carrier heater has very little flue gas emissions and no pollution And thermal pollution, meeting environmental protection requirements. Heat transfer oil has many advantages such as good thermal stability, good heat transfer performance, low vapor pressure, non-toxic, odorless, and non-corrosive to equipment. The heat-conducting oil boiler diesel burner uses a digital display temperature controller to control the temperature, with over-temperature alarm, low oil level alarm, and over-pressure alarm functions. It is used in the chemical, petroleum, machinery, printing and dyeing, food, shipping, textile, film and other industries An energy-efficient heating equipment. The heat-conducting oil boiler diesel burner can transfer the vaporization heat generated by another energy source to the object that requires heating. Compared with other similar heat-conducting materials, the heat-conducting oil boiler diesel burner has high energy transfer efficiency and good temperature control accuracy. Therefore, in agriculture, industry and commerce, including heat transfer oil boiler and diesel burner, the use of heat transfer oil is more extensive than other similar heat transfer materials. Of course, due to the different working environment and the characteristics of the heat transfer oil boiler diesel burner, the heat transfer oil boiler diesel burner also has corresponding shortcomings. For example, in a long-term high temperature environment, the heat transfer oil boiler diesel burner is stable There will be a big drop, personality and versatility will become worse. In severe cases, the heat-conducting oil boiler diesel burner will coking and cause explosions and other accidents. Therefore, the thermal oil boiler diesel burner also has advantages and disadvantages, and its flaws will seriously affect the normal operation of the thermal oil boiler diesel burner. The general reasons for the safety of the heat-conducting oil boiler diesel burner 1. Due to the over-temperature and over-pressure operation of the heat-conducting oil boiler diesel burner, coking in the pipe causes the furnace tube to rupture, and the leaked heat-conducting oil enters the furnace, causing fire and explosion. 2. Leaks in connection parts such as flanges, 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, and it is gradually oxidized after being accumulated in the insulation layer, resulting in low spontaneous ignition point components and leading to spontaneous combustion. 4. In some chemical companies, the heated materials contain oxidizers or active catalysts. If the heat transfer oil leaks into these materials, violent combustion or even explosion may occur. 5. In an open-operation system, if the temperature in the high-level tank is too high, 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-conducting 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, and even overpressure explosion. In addition, if the aerosol formed by the leaking heat transfer oil in the system reaches a certain concentration, it will also cause fire or explosion. 7. There is a problem with the quality of the selected heat transfer oil, or the thermal stability does not match the process conditions, and it 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, which causes the decomposition and polymerization of the oil, premature deterioration and deterioration, and the residual carbon, viscosity, acid value and other indicators greatly exceed the standard, and the insoluble carbon particles are deposited on The heating surface of the boiler diesel burner causes coking, carbon deposition, metal overheating and overheating, or damage to the seals, which leads to leakage, and fires when it encounters an open flame. 8. Sudden power failure or failure to circulate cooling according to the regulations when the furnace is shut down, so that the heat transfer oil stagnates in the high temperature furnace tube and causes overheating. In addition, if the hot oil pump does not work normally (such as idling, unable to hit the pressure), it will also cause the heat transfer oil to stay in the high temperature furnace tube and overheat. 9. The improper use of the filter causes the coking and sticky substances to fail to be filtered out and deposits into 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, produces low-boiling substances and vaporizes in the system, causing cavitation in the circulation pump and pipe vibration, and causing leakage in tight parts. 11. Adding new heat transfer oil to the system fails to remove the moisture in time, or the heat transfer oil heats up too fast, causing the volume to expand rapidly, and the liquid level of the high tank 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 transfer 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 carbon in the furnace tube and burn the furnace tube. How to deal with the leakage of the thermal oil boiler diesel combustion engine 1. If the valve seat or valve core sealing surface of the boiler diesel combustion engine is damaged, it will cause internal leakage. We can grind the valve seat or valve core sealing surface. In addition, if it is Electric or pneumatic may be the valve stroke is not set properly. 2. If the heat transfer oil boiler diesel combustion engine is leaking, you need to tighten the bolts of the middle flange. If the problem cannot be solved, you need to open it to see if the middle flange gasket is damaged; if If the packing is leaking, it is necessary to tighten the packing gland. If the packing is too loose, it is necessary to add the packing; if there is a leakage on the diesel combustion engine body of the boiler, it can be welded under low pressure. The reasons for the oil spill of the thermal oil boiler diesel combustion engine and the treatment method Users who use the thermal oil boiler diesel combustion engine have a question, that is, what causes the oil spill phenomenon, in fact, the oil spill phenomenon is the heat conduction of the heating system cycle When the oil's eyes exceed the pressure difference between it and the high tank, the oil and gas mixture will emerge from the high tank, which will cause oil spills. The editor comprehensively organizes relevant information and easily leads to oil spills in the diesel burner of the thermal oil boiler. The 3 situations. 1. Because the dehydration exhaust heating speed is too fast, the heating water in the heat transfer oil produces steam. Therefore, under the strong influence of the low boiling point volatiles, the heat transfer oil will leak oil from the overhead tank. 2. The oil spill of the heat-conducting oil boiler diesel burner is due to the heat persified equipment of the heating system. However, the heating temperature or the oil return temperature of the heat persified equipment of each heating system is different. The cold oil that enters the refrigeration system quickly makes the low-boiling substances vaporize in a large amount and the volume expands sharply, so that it will also cause the high-level tank to spill oil. 3. Sometimes due to unexpected conditions, the oil leakage formed in the high tank may be caused, such as sudden power failure, system leaks, problems with the circulating pump, forced suspension of the circulating heating system, rapid temperature rise, high boiling point substances of heat transfer oil, low boiling point The material and furnace temperature cannot drop in a short time, and the oil leaks caused by high temperature and more vaporization and evaporation directly into the upper tank.
Disposal methods: 1. First check whether the forced exhaust pipe is completely closed, whether there is internal leakage, and whether it is hot by hand. 2. Whether the height of the high slot is suitable, it is best to be 3~5 meters away from the highest point of the system (including equipment). A gb of 1.5~2 is obviously not enough. The higher the better. 3. System piping design problem, main line design is too detailed. 4. Reducing the circulation rate will cause the heat transfer oil to stay in the boiler diesel burner for too long, which will easily cause the thermal cracking and thermal oxidation of the oil. 5. Take some oil samples, check and see the situation. Reasons and solutions for the high tank temperature of the thermal oil boiler diesel burner. Generally speaking, experienced operators will understand that the temperature of the thermal oil boiler diesel burner high tank is best controlled within 70 degrees Celsius. If the temperature of the high tank is If the problem exceeds the expected setting for a long time, and the internal system of the related boiler diesel combustion engine still lacks nitrogen protection or cold oil protection, then naturally the heat transfer oil boiler diesel combustion engine will soon have problems. If the situation is serious, the heat transfer oil may appear directly Boiler diesel burner accident. So what are the reasons for the high temperature of the high-position tank of the light oil burner of the heat-conducting oil furnace? The heat-conducting oil operates at a high temperature in the furnace for a long time, and it oxidizes, and further evolves into coking and carbon, which causes the equipment pipeline to block. It will greatly increase the coal consumption and power consumption of the diesel burner of the overall boiler, and it may also cause the temperature of the high-level tank to rise rapidly. Pay attention to the following items when setting the upper slot. The following items should be paid attention to when setting the high-level tank 1. The high-level tank should be set at the highest position of the heating system, and the bottom of the tank should be at least 1.5m higher than the highest point of all heating equipment and heat conduction oil level in the system, so that the All parts have static pressure to prevent degassing of heat transfer oil in various parts of the high-level device when the pump is stopped. Moreover, the high-level tank cannot be installed directly above the light oil burner of the thermal oil furnace to prevent the high-level tank from spilling oil and cause a fire. 2. The use temperature of heat transfer oil reaches 250～320. At C, the volume expansion is about 20% to 30%, so the volume of the high tank should not be less than 1.3 times the expansion value of the heat transfer oil in the system at the rated temperature, and the liquid level of the heat transfer oil in the high tank should be ensured. The minimum liquid level and the maximum liquid level fluctuate within the range of 25% to 75%. 3. Level gauges, overflow pipes, minimum level alarms and emptying pipes should be installed on the high tank (the emptying pipe should have measures to prevent rainwater from entering). The location of the overflow should not be higher than the maximum liquid level indicated by the level gauge, according to the nature and requirements of the heat transfer oil used. A certain pressure of nitrogen or other inert gas should be passed into the upper tank. To prevent the thermal oil from oxidizing and deteriorating. 4. Use small-diameter expansion pipes to prevent convection of hot and cold oil. 5. The temperature of the upper tank should be controlled below 70℃. 6. It is forbidden to install a valve on the connecting pipe between the high-level tank and the safety expansion pipeline of the heat transfer oil system. The pipe is not allowed to have right angle bends and should not be insulated. The pipe diameter should be compatible with the heat supply of the oil furnace. In the process of actual use, is the distance between the expansion tank and the highest point of the system long enough? This also plays a significant role in the temperature problem of the high tank of the light oil burner of the heat transfer oil furnace, and whether the entire boiler diesel burner equipment Equipped with nitrogen and cold oil protection functions, which also have a good inhibitory effect on the occurrence of such phenomena. The choice of heat transfer oil and the method of use 1. The choice of heat transfer oil and system oil injection 1. The manufacturer and brand of heat transfer oil must be selected according to the actual situation. The boiling point of heat transfer oil should be higher than the maximum working temperature of the system. Since it is strictly forbidden to mix different grades of heat-conducting oil, it is recommended to consider the convenience of procurement or purchase more spare parts when choosing heat-conducting oil. 2. After the installation and inspection of the entire heating system are completed, the system is filled with oil. The heat transfer oil is filled through the expansion tank oil injection port. When filling the oil, all valves in the system (except the oil drain valve) are opened, and then the heat transfer oil is slowly fed through the expansion tank. Inject the system. 3. When the liquid level shows about 1/2 of the height of the expansion tank, stop oiling. 4. After filling the oil, close the oil filling cap, connect the oil spill pipe, and carefully check the switch of each valve in the pipe. It is strictly forbidden to see oil or oil leakage in the system. 2. Dehydration exhaust of heat conduction oil heating system 1. Normal temperature exhaust: Turn on the power, open the inlet and outlet valves and exhaust valves of the diesel burner of the electric heating heat conduction oil boiler, press the start button of the oil pump, the oil pump operation indicator light is on, and the oil pump should Operate normally in the direction indicated by the arrow, the pressure of the pressure gauge is displayed within the specified range, and listen to the operation of the oil pump. If there is any abnormality, stop and check immediately, and restart the oil pump after troubleshooting, and exhaust at room temperature until the pressure gauge indicates stable . When exhausting at room temperature, pay attention to observe the liquid level in the expansion tank, and replenish it in time when it is lower than the specified liquid level. 2. Heating dehydration: After confirming normal operation at room temperature, you can perform heating dehydration exhaust (read the heat transfer oil instruction manual and the temperature controller instruction manual before operation). The heating dehydration exhaust can be carried out as follows: the heating speed is passed Adjust the starting heating power to control; the constant temperature is achieved through the temperature control setting. The first step: when the temperature is raised to 100-120℃ and the heat preservation starts, the heating rate should be controlled within 50℃/h, and the pressure gauge should be monitored to see if it is normal. If no pressure or unstable pressure is found, there is still residual gas in the system At this time, it is required to repeat the normal temperature exhaust operation according to 5.4.1, and continue after the system pressure is stable. The temperature is increased to 120°C for a long time heat preservation. The length of the heat preservation time is related to the total capacity of the system and the quality of the heat transfer oil. The second step: heat up to 150-180°C for heat preservation. To remove the light components, volatiles and residual moisture in the oil, please refer to the dehydration exhaust curve diagram of the diesel burner system of the GYD series electric heating heat transfer oil boiler. The third step: after the dehydration exhaust is completed, the exhaust valve should be closed and put into normal heating operation. 3. Matters related to the process of heating and dewatering. During the heating process, the pipeline may make a knocking sound, indicating that there is a large amount of gas in the system or the pipeline is not smooth. At this time, reduce the heating rate and eliminate the sound after the gas is removed; if the pipeline is not smooth, it should be eliminated. During the dehydration and exhaust process, a large amount of gas may rush into the expansion tank, causing the heat transfer oil in the tank to overflow. The oil spill container should be placed under the oil spill pipe before operation. When dehydrating and exhausting, there must be staff guarding the scene, and if any abnormalities are found, they should be dealt with in time.

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