Analysis of hazard factors of heat conduction oil boiler diesel burner

The thermal oil boiler diesel burner is an environmentally friendly and efficient boiler diesel burner type, which usually uses coal, oil, gas and electricity As the fuel, the heat transfer oil is used as the medium, and the circulating pump is used for liquid phase circulation, so as to transfer the heat energy to the heating equipment. However, due to problems in design, process, and use, the diesel combustion of heat-conducting oil boilers may cause certain safety hazards. So let's briefly introduce it below. Factors that cause safety hazards for thermal oil boilers and diesel burners. Quality problems. In recent years, with the development of my country’s economy, organic heat carrier furnaces have been used more and more widely, and the number is increasing. According to surveys, organic heat carrier furnaces are produced nationwide. Nearly 70 factories: Due to the production qualifications that most manufacturers do not have, it will cause quality problems of organic heat carrier furnaces, such as unqualified welding quality, unreasonable structure, insufficient strength, and problems with safety accessories. Necessary accident. Circulating pump is not equipped with heat transfer oil boiler diesel burner. The heat carrier (heat transfer oil) is transported to the heating system by the power (pressure) of the circulating pump for forced circulation to meet the needs of the heating process, that is, the energy exchange process. The heat transfer oil boiler diesel combustion The pressure of the machine heating circulation pipeline system is determined by the pressure of the circulation pump. The circulation pump acts as a suspected animal's 'heart' in the circulation of the heat transfer oil in the entire heating system. If the circulating pump stops running, the circulation of heat transfer oil will be interrupted. In order to achieve the purpose of forced circulation stability of the heat transfer oil in the heating system, a high-quality circulation pump must be installed in the system. According to the characteristics of the heat transfer oil heating system, in addition to the technical performance of common pumps, the configuration and performance of the circulating pump should also meet the following requirements: 1. Equivalent matching: the flow, lift and power of the circulating pump should be used with the heating system The oil volume and its resistance drop are matched to the requirements. 2. Set up backup pumps: The heating system should be equipped with two independent circulating pumps with their own power sources. 3. Filter configuration: A coarse filter should be installed at the inlet of the circulating pump. All the heat transfer oil pumped must be filtered. A fine filter should be installed on the bypass of the main pipeline of the heating system to filter out the carbon particles suspended in the heat transfer oil. And high polymer. 4. Tightness: The hard seal of the circulating pump is reliable, and leakage is strictly prevented. 5. Corrosion resistance: The cavitation allowance of the circulating pump should be less than the cavitation allowance of the device of the circulation system to avoid cavitation during pump operation. 6. Heat resistance: The circulating pump should be adapted to the characteristics of the temperature change of the heat transfer oil, and the temperature rise should be gradual. The pump should be preheated by the heat transfer oil that gradually rises in the system before high temperature operation. There are many reasons for the deterioration of heat transfer oil, but the most important ones are pollution, thermal cracking and oxidation. Pollution: The presence of impurities will accelerate the rate of deterioration of the heat transfer oil and prevent the heat transfer oil from being contaminated by impurities. Just wash the furnace carefully before changing the oil and prevent mechanical impurities, moisture and other impurities from mixing in during storage, transportation and use. Oxidation: Air infiltration into the system will cause oxidation of the heat transfer oil, and the oxidized heat transfer oil will form a large amount of solid dirt. Usually the infiltration of air comes from an open expansion tank. The heat transfer oil is oxidized to a certain exposed area and temperature. Corrosion products and rust are often due to the rate at which insolubles are formed. The rate of formation depends on the weak acid formed by the heat transfer oil in the air oxidation products and the moisture entering from the expansion tank or other parts. The mixture of the deterioration products of the heat transfer oil and the oxidized heat transfer oil insoluble matter will deposit on the surface of the heat exchanger, especially the low flow rate part of the system such as the dead corner or the lowest point. Thermal decomposition and aging coking: The thermal decomposition of heat transfer oil is caused by the use temperature of heat transfer oil exceeding its thermal decomposition limit temperature. For example, where the heat flow strength is too large or the fluidity is restricted, the cracking of the heat transfer oil often occurs, and the thermal decomposition of the heat transfer oil often causes the heat medium furnace tube to coke. In heat transfer oil contaminated by decomposed antioxidants and impurities, coking is more rapid. The formed coke adheres to the pipe wall, affecting heat transfer, and further accelerating cracking, condensation and coking, causing a vicious circle. A large amount of coke accumulates on the furnace tube wall, directly affecting the safety of the furnace body. The cracking rate of heat transfer oil increases rapidly with the increase of temperature, and the cracking speed of heat transfer oil doubles for every 10 increase in temperature. Heat conduction oil boiler diesel combustion engine overpressure heat conduction oil boiler diesel combustion engine operation, the pressure in the boiler diesel combustion engine exceeds the maximum allowable working pressure and endangers safe operation phenomenon is called an overpressure accident. The maximum allowable pressure can be the design pressure of the boiler diesel combustion engine or the allowable working pressure of the boiler diesel combustion engine which is found to be defective after inspection and reduces the strength. In short, the danger of overpressure in boiler diesel burners is relatively high, which is often the direct cause of explosion accidents of boiler diesel burners. 1. The phenomenon of overpressure in the heat-conducting oil boiler diesel combustion engine (1) The vapor pressure rises sharply, exceeds the allowable working pressure, and the pointer of the pressure gauge exceeds 'The pressure is still rising after the red line man safety valve operates. (2) An overpressure alarm signal is issued. , The overpressure interlock protection device acts to stop the air supply, coal supply and induced air of the boiler diesel burner. (3) The steam temperature increases and the steam flow decreases. 2. The reason for the overpressure of the boiler diesel burner (1) Steam consumption The unit suddenly stopped using steam, causing the steam pressure to rise sharply. (2) The furnace staff did not monitor the pressure gauge, and did not weaken the combustion when the load was reduced. (3) The safety valve failed, the valve core and the valve seat were stuck and could not be opened, safe There is a blind plate connected to the valve inlet, and the safety valve exhaust capacity is insufficient. (4) The pressure gauge tube is blocked, frozen, the pressure gauge fails after the calibration period, the pressure gauge is damaged, the pointer indicates the pressure is incorrect, and it does not reflect the boiler diesel burner Real pressure. (5) The overpressure alarm fails and the overpressure interlock protection device fails. (6) The boiler diesel burner used for pressure reduction after inspection, if the safety valve diameter is not changed accordingly (the boiler diesel burner is used for pressure reduction When the safety valve diameter is increased), the safety valve’s exhaust steam capacity is insufficient, and the steam pressure cannot be controlled and overpressure.
Improper operation of the thermal oil boiler diesel burner 1. Sudden power failure, immediately extinguish the fire and then Operate in accordance with the operating procedures, otherwise it will cause huge losses due to the burning of the heat transfer oil boiler diesel burner furnace tube. 2. Strictly control the circulating flow rate of the heat transfer oil not to be less than 1.5 m/s, because some of the temperature difference between the inlet and outlet is pulled during use. Too large, destroying the original design requirements, making the heat transfer oil unable to maintain the original circulation state, thickening the boundary layer, and increasing the thermal resistance, so that the furnace wall exceeds the temperature of the oil film, causing carbon deposition, cracking, polymerization, and Coking or even burning through the furnace tube. 3. Choose the heat transfer oil reasonably according to the type of heat transfer oil boiler diesel burner. Avoid over-temperature use. Do not save money to buy substandard oil, and do not mix heat transfer oil indiscriminately, otherwise the consequences will be serious. 4. After using the heat transfer oil boiler diesel burner for half a year, you must sample and test the heat transfer oil according to the instructions. If problems are found, replace with new heat transfer oil immediately, but you must be careful not to mix different types of heat transfer oil. 5. Generally heat conduction when the furnace is shut down The hot oil pump can be stopped when the oil temperature drops below 70 degrees. The solution to the overpressure of the heat-conducting oil boiler diesel burner 1. Quickly weaken the combustion and manually open the safety valve or bleed valve. 2. Increase the water supply and strengthen the lower drum at the same time Blow down (at this time, keep the normal water level of the boiler diesel burner) to reduce the boiler water temperature, thereby reducing the pressure of the boiler diesel burner drum. 3. If the safety valve fails or all the pressure gauges are damaged, the boiler should be stopped urgently and wait for safety After the valve and pressure gauge are repaired, the pressure should be increased. 4. When the boiler diesel combustion engine is overpressured and the safe operation is endangered, pressure reduction measures should be taken, but the pressure reduction speed is strictly prohibited. 5. The boiler diesel combustion engine is seriously overpressured. After the elimination, the boiler should be shut down to conduct internal and external inspections on the boiler diesel burner, and the deformation and leakage caused by overpressure should be eliminated, and the unqualified safety accessories should be repaired. Thermal oil boiler diesel fuel Correct operation procedures for burning machine 1. Check whether the internal grate of the heat transfer oil furnace and light oil burner is intact, whether the furnace is built with refractory bricks, whether the sealing material filled in the sealing part is qualified, and whether the coal seam gate is sensitive and basic Whether the bolts are fastened, whether the bolts on the movable parts are loose, and whether the sundries in various parts of the furnace are removed and clean. 2. Check all the piping, pay special attention to checking whether the valve installation position, fixed point, and sliding position meet the planning requirements, whether the blind plate set on the piping pipeline during the construction is removed, the pipeline support, the free connection point, and the condition Is the valve of the loop system fully opened? Is there any leakage of all pipes and accessories? Is the slope, length, elbow, flow section and placement of the expansion tube reasonable? 3. Check whether various meters such as temperature, pressure, pressure difference, liquid level, flow rate, degree-sensitive components, transmission, actuators, etc. are sensitive, and whether the joints are welded firmly. 4. Check the mechanical changes carefully to see if the operation of the manual parts is convenient and sensitive, the coupling and the transmission belt work well, the smooth condition of the transmission and the transmission belt work are outstanding, the smooth condition of the transmission and the gearbox, Is the oil level of the bearing box normal? Start the main circulating pump to see if its changing direction is correct, and if the pump and coupling are running smoothly. 5. The inside of the pipeline is flushed and cleaned to remove dirt and impurities. The flushing must be complete. Compressed air can be used for penetration to extend in all directions. 6. After the equipment and pipelines are flushed and cleaned, water pressure test and air tightness test shall be carried out. After the test, it is necessary to completely purge the remaining water in the equipment and pipelines with compressed air. 7. Working equipment (including coal loading, slagging, blasting, induced air, grate, motor, etc.) should work for 2 to 4 hours without load. 8. Is the fire-fighting equipment in the production area in place, the condition is outstanding, and the lighting is equipped with explosion-proof lampshades? 9. Before the hot test, the disturbance signal system must be disconnected, and all detection equipment must not generate sound and light signals. The degree of automation of the thermal oil boiler diesel burner continues to increase. In this social environment that pays more and more attention to efficiency, even Our thermal oil boiler diesel burner industry is also constantly improving its efficiency. Correct cleaning 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 discharge 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!