Causes causing the bulging tube of the heat-conducting oil boiler diesel burner

1. Use inferior oil or regenerated oil that does not meet national standards. Indicators such as carbon residue greatly exceed the standard. 2. Over-temperature and overheating: A. Sudden power failure, the heat-conducting oil caused the hot oil furnace tube to stagnate. B. The hot oil pump works abnormally, idling and cannot be pressed, causing the heat medium in the furnace tube to stagnate. C. Improper operation: After the furnace is shut down, when the oil temperature in the furnace is higher than 80°C, the oil pump stops rotating and circulating cooling, resulting in poor oil quality and coking. D. First, the filter is not used properly: For example, a filter made of stainless steel wire mesh is about 26 mesh/inch, which can only filter out larger colloidal coke, while smaller coke still cannot be filtered out and deposited on the bottom Pots or walls on heated surfaces cause overheating. E. The heat transfer oil of the heat transfer oil furnace and light oil burner will still undergo some chemical changes during the heating process, resulting in a small amount of high polymer, and local overheating caused by coke. These polymer and carbon residues are insoluble in the oil and suspended in the oil. In the operation of these substances, they can be deposited on the bottom of the drum and overheated, and deposited on the tube wall and overheated. Safety countermeasures (1) to ensure the safety of equipment The heat transfer oil heating system should be managed as a pressure equipment to ensure that the heating equipment is intact and leak-free, otherwise the consequences will be very serious. The wall thickness and compressive strength of the equipment should be tested regularly during use. Pressure gauges, safety valves and vent pipes should be installed on the equipment and pipelines. (2) Strict and safe operation When using the thermal oil boiler diesel burner, the temperature should not exceed 350℃ to prevent the temperature from rising and overpressure, which may cause danger. In order to avoid overheating of the pipe wall on the heating surface of the heat transfer oil, the flow of the heat transfer oil should be turbulent, that is, Reynolds number Rc>10000, with a certain speed, thereby reducing the thickness of the boundary layer when flowing over the heating surface. During the heating operation, the circulation pump of the heat carrier is not allowed to stop. When the thermal load is reduced or temporarily stopped, the bypass return valve should be opened to adjust the system flow, so that the heat transfer oil in the pipe has sufficient flow and flow. The heating furnace should be preheated to the empty tube of the heating surface tube and the system tube when starting. Start the ignition temperature rise, because the heat transfer oil has low temperature, high viscosity, low flow rate, and film thickness, the heating rate must be strictly controlled, generally below 40-50°C/h to avoid local overheating. When the circulating heat transfer oil temperature is high but the temperature of the thermal equipment does not rise, the outlet temperature of the heat transfer oil should not be increased blindly, but the cause, such as dirt, blockage, etc., should be found from the thermal equipment. Use heat transfer oil to heat, and pay attention to the relationship between temperature and pressure at the beginning of the start. If the pressure is high and the temperature is low, it means there is water. If the pressure is low and the temperature is high, it means that the amount of heat transfer oil is insufficient, and heat transfer oil should be added. When the system stops running, the heat transfer oil circulating pump should continue to run for a period of time. After the heat carrier has cooled, all the heat transfer oil in the system should be returned to the storage tank. In particular, the heating surface should not remain. (3) Ensure that the water entering the heat transfer oil is strictly prohibited from mixing water or other low-boiling impurities and flammable and explosive substances in the heat transfer oil. When starting, the water in the system should be drained first, then the water inlet valve and check valve should be opened, and the water in the heat carrier should be removed according to the heating regulations; the newly added heat transfer oil must be preheated and dehydrated before being added. When dehydrating, first open the empty valve, and then use a small fire to raise the temperature of the heat transfer oil to 150°C at a heating rate of 5°C/h to make the water evaporate and escape. Then close the exhaust valve and heat to 250°C at a temperature increase rate of 10°C/h. During the heating process, if you hear the sound of water or see high pressure, you should immediately open the large exhaust valve to exhaust steam, and then close the exhaust valve to start. When the furnace is stopped, the steam valve of the light oil burner of the heat-conducting oil furnace should be closed after the heating material is released to prevent the material from leaking into the system. (4) Removal of coking and scaling. In production practice, the thickness of coking is safely below 2mm, and the coking layer in the furnace tube is between 0-1.5mm. At this time, the continuous accumulation of the coke layer and the amount of melting washed away by the heat carrier roughly balance. The thickness of the coke layer in the furnace tube can be measured with an ultrasonic thickness gauge. A filter should be installed at the inlet of the circulating pump to remove suspended polymers and carbon particles precipitated by local overheating caused by chemical changes. The filter should be easy to disassemble and replace in order to clean up the residue and impurities regularly to ensure the filtering effect. (5) Strengthening safety management should pay attention to formulating and implementing technical specifications and management regulations for the operation of oil heating equipment, and strictly abide by relevant laws, regulations and safety operating procedures. The heat transfer oil heating operation should have a complete emergency treatment plan, especially to prevent overflow, spray, leakage, and overload with diseases. Once the point is leaked, the leakage should be blocked immediately and the insulating cotton should be replaced. (6) Set up safety devices Set the automatic adjustment system of temperature, pressure, flow, liquid level, alarm system and safety release device to ensure that instruments and meters are sensitive and easy to use. During the heating operation, if the pressure suddenly rises, open the exhaust valve to immediately release the pressure, and close the valve of the heat carrier pipe to the heating device. ! If you are interested in diesel combustion engines, please contact us for a quote!