How to improve the thermal efficiency of the thermal oil boiler diesel burner?

A wide variety of thermal oil boiler diesel burners are popular in the current market. However, it may not be an easy task to select a boiler diesel burner with a combustion heat efficiency of 100% among the many manufacturers and types of thermal oil boiler diesel burners. This requires that the boiler diesel combustion engine be in the best environment during daily operation, and the daily maintenance will be very demanding. Therefore, even if the combustion efficiency is not 100%, it is equally important to improve the thermal efficiency of the boiler diesel burner. So let's briefly explain below. The heat transfer oil boiler diesel combustion engine system is a heat supply and heat transfer system. The biological energy or electric energy of the fuel is converted into the heat energy of low temperature oil through the heater, and then the heat energy of the high temperature oil is transferred to the required heating part through the pipeline circulation system. . Therefore, in the process of energy conversion and transmission, there is bound to be energy loss and dissipation. Traditional heating oil furnaces use coal, wood and other fuels to heat low-temperature oil. The degree of combustion and the loss of high-temperature gas produced by combustion will inevitably result in the efficiency of energy conversion. The heat loss in the energy transfer pipeline will also reduce the heating efficiency of the entire system. Therefore, we found that the factors that affect the thermal efficiency of the heat transfer oil furnace light oil burner mainly include the following aspects: 1. Incomplete fuel combustion and the discharge of burning high-temperature gas; 2. The thermal energy diffusion of high-temperature oil during pipeline transmission; 2. Heat energy is lost during heat exchange in the heat transfer system. The effect of the coking of the electric heating rod on the thermal efficiency When the heating rod is used to heat the heat-conducting oil, the surface of the electric heating rod will soon be coked and charred, and the electric heating rod will eventually be burned and the heat-conducting oil will be scrapped. The cause of serious carbon deposit 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 and limit the heat load on the surface of the rod within 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. The hazards of inferior heat transfer oil 1. It is easy to cause coking and coking, which affects heat transfer efficiency and increases energy consumption. 2. Blocking the pipeline, or even causing leakage, leading to safety accidents. 3. The oil is rapidly aging and its fluidity deteriorates. 4. It brings a lot of trouble to the follow-up treatment, and it takes a lot of manpower and material resources to dismantle, clean and install the equipment. 5. Other unforeseen losses and impacts. How to distinguish inferior heat transfer oil 1. From the appearance, there is not much difference between inferior products and standard products, but a closer inspection will find that inferior products will have color changes even at room temperature. This change will gradually change from light yellow to dark black. Over time, inferior products will be exposed without entering the system. 2. From the product index, there are many indexes of heat transfer oil. You can check the main ones first, and the freezing point test can tell whether the oil is fraudulent. Even if it is faked, inferior products can be exposed by simple high-temperature heating. The heat-conducting oil pour point depressant after high temperature will evaporate during the heating process, making the pour point depressant ineffective. 3. From the perspective of volatilization characteristics, take the same number of samples for comparison to see the degree of volatilization. In general, inferior products have a relatively low flash point, which will cause greater volatilization and strong black smoke. 4. From the perspective of flash point characteristics, although the flash point of oil is a safety index, it is related to its degree of refining to some extent, so sometimes the characteristics of a product can be judged by the flash point, because the higher the degree of refining, the relative The quality of the products is relatively stable. 5. From the perspective of oxygen absorption speed, use professional equipment to detect the oxidation stability index of heat transfer oil. The slower the oxygen absorption speed, the stronger the oxidation resistance, and vice versa, the worse. 6. From the perspective of thermal stability, if there is no condition for the bench test, the quality of the oil can be judged simply on the crucible. Generally, low-quality heat transfer oil is heated at high temperature, and it will catch fire if it is not heated to a specific temperature, and the carbonization is serious. . The heat transfer oil has a long service life, large system capacity, and high cost for one oil change. If inferior products are used cheaply, some have short service life, and it is easy to produce deposits on the heating coil and heat exchange equipment, which reduces the heat transfer effect It is also very troublesome to clean the internal deposits. You should never choose inferior products for cheap oil prices and cause big troubles and lose out. How to improve the thermal efficiency of the thermal oil boiler diesel burner 1. Set up an air preheater. One of the most effective measures to improve the thermal efficiency of the light oil burner of the thermal oil furnace is to use an air preheater for heat recovery. However, the biggest problem with air preheaters is that low-temperature corrosion of materials easily occurs when sulfur-containing fuels are used. In order to control this kind of corrosion to a certain extent, a minimum limit should be set for the metal temperature in the low temperature zone according to the amount of sulfur in the fuel. For this reason, there is also a restriction on the temperature of the flue gas at the outlet of the air preheater. In this way, the highest possible thermal efficiency can be determined. 2. Increase the heat transfer area of ​​the convection section. Increasing the heat transfer area can improve the thermal efficiency of the furnace. However, generally speaking, the heat transfer area of ​​the radiant section has an appropriate range due to the size of the grate or the shape of the burner. It is not a good strategy to increase the heat transfer area of ​​the radiant section excessively. Therefore, the method of increasing the heat transfer area of ​​the convection section is usually adopted to achieve the purpose of improving the thermal efficiency of the furnace. 3. Use waste heat boiler diesel burner for heat recovery. The waste heat boiler diesel burner uses the heat in the waste heat of the flue gas discharged from the light oil burner of the heat transfer oil furnace to heat water or generate steam. The installation of this waste heat boiler diesel burner will not change the fuel consumption of the thermal oil furnace itself. The hot water or steam generated by the waste heat boiler diesel burner can be used for production and heating, thereby indirectly saving fuel. Diesel burners with waste heat boilers have the following effects: First, because water is used for heat recovery, it is easy to improve the thermal efficiency of the furnace. Second, because the flue gas of several heat-conducting oil furnaces and light oil burners can be concentrated for heat recovery, the construction cost of unit heat recovery can be reduced. 4. Reduce excess air rate. In the design of the heat-conducting oil furnace light oil burner, the thermal efficiency of the furnace can be improved by reducing the excess air rate. In order to reduce the excess air rate, an air inlet baffle is usually set to adjust the combustion air. For oil-fired or gas-fired hot oil furnaces, low excess air burners can be used. Through the above method, the thermal energy efficiency of the light oil burner of the heat-conducting oil furnace can be improved, so the fuel cost will be reduced, the operating cost will also be reduced, but the equipment manufacturing cost will increase. Therefore, the experts of Energ heat conduction oil furnace light oil burner suggest that the designer of heat conduction oil furnace light oil burner should evaluate and analyze these factors to determine the best thermal efficiency. The so-called optimal thermal efficiency is the minimum efficiency that the sum of the manufacturing cost, fuel cost, operation cost and the use cost of the heat transfer oil for the heat transfer oil furnace light oil burner. How to clean the pipes of the light oil burner of the heat transfer oil furnace and water pressure test Before the light oil burner of the heat transfer oil furnace is ready for operation, the entire system of the light oil burner of the heat transfer oil furnace must be cleaned. It is recommended to use pickling agent for cleaning. Carry out chemical cleaning. After cleaning, it must be neutralized, and the oil furnace can be operated after the test is qualified. After cleaning the light oil burner of the thermal oil furnace, a hydraulic test must be carried out. The water for hydrostatic test should be clean water, the temperature of which is not lower than the surrounding dew point temperature, but not too high, generally 20-70℃, the ambient temperature during the test should not be lower than 5℃, and antifreeze must be used when it is lower than 5℃ Measures. When the pressure of the light oil burner of the heat conduction oil furnace rises to the maximum working pressure of the system, the pressure rise is suspended, and the pressure components and connections are checked. If there is no abnormal phenomenon, the pressure continues to rise to the system test pressure and maintain the pressure 5 -10 minutes, do not use the pump to maintain the pressure, and then lower to the highest working pressure for inspection. During the inspection, the pressure remains unchanged. There must be no water droplets or mist on the weld and the wall. After the hydraulic test is over, the Drain the water and dry it thoroughly with clean compressed air so that it can be used effectively. Daily maintenance and maintenance of the heat-conducting oil boiler diesel burner 1. The electrical control cabinet should avoid dust accumulation, and it should be blown with compressed air frequently to ensure good electrical contact. 2. The heat transfer oil in the diesel burner of the electric heating heat transfer oil boiler should not exceed the maximum allowable temperature. Ensure the quality of heat transfer oil. Strictly control the performance indicators of the organic heat carrier. The exhaust valve should be opened during the initial start of the organic heat carrier furnace to clear the air, water and organic heat carrier mixed steam in the diesel burner of the electric heating heat transfer oil boiler. . Generally, after half a year of use, the heat transfer oil is sampled and tested every 3 to 6 months, and different oils should not be mixed. 3. Electric heating heat transfer oil boiler diesel combustion engine boiler diesel combustion engine should always check the temperature measuring instrument and perform regular measurement to prevent the increase of the thermal resistance of the temperature measuring node, which may cause incorrect operation of the temperature. 4. The installation of the circulation pipeline should facilitate the removal of gas in the pipeline. If the circulation pipeline leaks, it should be stopped in time and repaired before use. 5. When it is found that the oil temperature is difficult to rise during the operation of the diesel burner of the electric heating heat transfer oil boiler, check whether the pipeline is unblocked, whether the valve is wrong, whether the filter is blocked, etc., and it can be used after removing it. The device should be removed and washed regularly. 6. The user should customize detailed operating procedures and regular maintenance and repair systems, and the operator should be very familiar with and master the essentials of this equipment. 7. Always check the electric heating tube contacts, fuses, instruments, electric contact pressure gauges and relays. 8. Since the electric heating heat conduction oil boiler diesel combustion engine uses precision instruments, severe vibration is strictly prohibited during transportation and installation. Doing a good job in the maintenance and maintenance of the diesel burner of the electric heating heat transfer oil boiler can prolong the life of the equipment and maximize its work efficiency, so that the entire production process can operate safely and stably. 9. After long-term use, after replacing the electric heating element, the wiring must be reliable, and the heater must be tested for leaks to prevent leakage of heat transfer oil, poor electrical contact, and fire causing fire accidents. 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 it 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. Water washing①: 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!