What are the factors that affect the thermal efficiency of thermal oil boiler diesel burners?

　　The heat-conducting oil boiler diesel burner is to insert the heating element directly into the heat-conducting oil for direct heating, and The circulating pump is used to force the heat transfer oil to circulate in the liquid phase, thereby transferring the heat to the boiler diesel burner of the heating equipment. So let's do a simple understanding of the thermal efficiency of the thermal oil boiler diesel burner. The working principle of the heat-conducting oil boiler diesel combustion engine is firstly burned in the combustion chamber. After the radiant heating surface absorbs most of the heat, the high-temperature flue gas enters the convective heating surface for heat exchange. After the boiler diesel burner, it is in the air preheater The air required for the combustion of the diesel burner of the medium heating boiler is sent to the chimney and discharged into the atmosphere by the induced draft fan through the dust collector. The circulating oil pump is used to force the liquid phase to circulate, and the heat energy is transferred to the heating equipment, and then returned to the reheated direct-flow special industrial boiler diesel burner. The fuel of the heat-conducting oil furnace and light oil burner includes coal, heavy oil, light oil, combustible gas and other combustible materials, and the heat-conducting oil is the heat carrier that transfers heat. The heat-conducting oil furnace light oil burner has the characteristics of low pressure and high temperature operation, and the heating temperature can reach 340°C in the liquid phase or 400°C in the vapor phase.　　The generation of thermal efficiency of the thermal oil boiler diesel burner　　1. Increase the heat transfer area of ​​the convection section. Due to the size of the grille or the shape of the burner, the heat transfer area of ​​the radiating part has an appropriate range. Excessively increasing the heat transfer area of ​​the radiant section is not the best strategy.　　2. Air preheater is used for heat recovery, but the biggest problem is that low-temperature corrosion of materials easily occurs when sulfur-containing fuels are used. In order to control this corrosion to a certain extent, the metal temperature in the low temperature zone should be set to a minimum according to the sulfur content in the fuel.　　3. The waste heat boiler diesel burner is used for heat recovery, using the heat generated by the waste heat of the flue gas discharged from the heat transfer oil furnace to heat water or generate steam. The waste heat boiler diesel burner usually does not change the fuel consumption of the hot oil furnace itself. The hot water or steam produced by the diesel burner of the waste heat boiler can be used for production and heating, and it can also save fuel indirectly.　　4. Reduce the excess air rate. By reducing the excess air rate during the design process of the heat transfer oil furnace, the thermal efficiency of the furnace can be improved.　　 5. We often use the method of increasing the FGS hot zone in the convection section to improve the thermal efficiency of the furnace. We recommend this method.　　6. ​​The flue gas has a limit on the outlet temperature of the air preheater, so the highest thermal efficiency achieved can be known. How to ensure the thermal efficiency of the thermal oil boiler diesel burner 1. Reduce the heat loss of exhaust gas 1. Prevent slagging and ash accumulation on the heated surface 2. Reasonably operate the pulverized coal burner 3. Pay attention to the influence of the feed water temperature 4. Avoid entering the boiler diesel burner Excessive air volume 5. Pay attention to the impact of the operation of the pulverizing system 1) For the intermediate storage silo-type pulverizing system, pay attention to reducing the three air volume during operation. The tertiary air is generally designed and arranged on the uppermost layer of the burner. Because the temperature of the tertiary air is not high and contains a certain amount of coal, the injection of the tertiary air will delay the combustion and increase the flame center, thereby increasing the exhaust gas temperature. 2) During operation, reasonably adjust the pulverizing system to ensure qualified coal fineness, improve the separation efficiency of each separation element, and minimize the powder content of the tertiary air, which is beneficial to maintain the normal flame center in the furnace without lifting it high. 2. Reduce the heat loss of solid incomplete combustion 1. Reasonably adjust the fineness of pulverized coal. The fineness of pulverized coal is one of the main factors affecting the combustibles of ash and slag. In theory, the finer the pulverized coal, the less combustibles after combustion. It is helpful to improve the combustion economy, but the finer the coal, the more ash will be on the heated surface, which affects the heat transfer efficiency and increases the power consumption of the pulverized coal. However, the coal pulverized coal has large particles that are too coarse and difficult to burn completely. The fly ash combustible content Will be greatly increased, so a reasonable value of pulverized coal fineness should be selected to reduce the heat loss of solid incomplete combustion. 2. Control a proper amount of excess air coefficient. The complete combustion of carbon particles needs to be mixed with enough oxygen. The insufficient amount of air sent into the furnace will not only produce incomplete combustion gas, but also make the carbon particles incomplete combustion, but the amount of air If it is too large, it will lower the furnace temperature and affect the complete combustion. Therefore, the excess air coefficient is too large or too small to be harmful to the complete combustion of carbon particles. The appropriate excess air coefficient should be determined through the combustion adjustment test. 3. Strengthen the combustion to adjust the fuel combustion in the furnace, the temperature of the furnace, the difficulty of igniting when the pulverized coal enters the furnace, have a direct impact on the content of fly ash and slag combustibles, and the combustion conditions in the furnace are not good. There will be no higher furnace temperature. After the pulverized coal enters the furnace, there is not enough heat to preheat and ignite. It will delay the combustion and increase the carbon content of the fly ash. To make the combustion conditions in the furnace normal, the combustion The air ratio of the boiler, the primary air powder concentration and air volume are adjusted, the characteristics of the burner are mastered, and the boiler diesel burner is in the best combustion condition. The adjustment of the combustion condition is important to reduce the heat loss of incomplete solid combustion. aspect. 3. Ensure the coal quality of the boiler diesel burner. The composition of coal has a great influence on the improvement of combustion speed and the degree of complete combustion. Coal with more volatile content is easy to ignite, and coal with less volatile content is difficult to ignite and is not easy to burn completely. The ash content in coal will hinder the contact between combustible matter and oxygen, making it difficult for carbon particles to burn completely, and affect the thermal efficiency of boiler diesel burners. The composition of ash in coal also directly affects the ash melting point and slagging on the heated surface. , Ash accumulation and wear have an impact, and too much moisture in the coal is not conducive to combustion, making it difficult to ignite, and reducing the combustion temperature. It will also increase the volume of flue gas and reduce the efficiency of the boiler diesel burner.　　Four. Reduce the loss of soda and water. 　　 The soda and water loss of the boiler diesel combustion engine is mainly caused by the sewage and drainage during the operation of the boiler diesel combustion engine, except for the running, emitting, dripping and leaking caused by poor maintenance quality. Therefore, the loss of soda and water should be reduced from the following aspects: 　　1) Ensure the quality of the feed water of the boiler diesel burner. The quality of the feed water of the boiler diesel burner is high. Under the boiler water concentration ratio designed for the boiler diesel burner, the pollution discharge rate is reduced.　　2) Improve the installation and maintenance quality of the steam-water separation device, and improve the steam-water separation effect.　　3) Keep the boiler diesel burner load, water level, steam pressure and other parameters stable during operation, so that the boiler diesel burner steam-water separation device operates under normal conditions.　　4) When the boiler diesel combustion engine starts and stops and abnormal conditions, open and close the drain in a timely and reasonable manner, carefully check the drain door and the drain door for leakage during operation, and deal with it in time to reduce unnecessary heat loss.　　The effect of the quality of the heat transfer oil on the boiler diesel burner　　The quality of the heat transfer oil itself is the key to the life of the heat transfer oil. It is difficult to guarantee the long life of the heat-conducting oil with congenital insufficient heat-conducting oil. Whether to use good quality raw oil for production is the primary factor that determines the quality of heat transfer oil. What is the quality of heat transfer oil? Nowadays, the physical and chemical indicators of heat transfer oil are generally regarded as its quality indicators. Heat transfer oil has acid value, residual carbon, viscosity, flash point, moisture, density, distillation range, freezing point, oxidation resistance, and corrosion. , Specific heat capacity, thermal conductivity, thermal stability and other more than a dozen physical and chemical indicators, the value of each indicator will affect the service life of the heat transfer oil. However, one should not blindly pursue the maximum or minimum value of a certain index. There should be a concept of degree, and an appropriate value is the most appropriate.　　 During the use of heat transfer oil, the physical and chemical indicators are constantly changing. In addition to static physical and chemical indicators, the quality of heat transfer oil should pay more attention to the dynamic change trend of physical and chemical indicators during the use of heat transfer oil. In the high temperature operation of heat transfer oil, the slower the change rate of physical and chemical indicators, the longer the life of heat transfer oil. Analyzing the changes in the physical and chemical indicators of the heat transfer oil during use is an effective way to extend the life of the heat transfer oil. The prerequisites for the cleaning of the heat conduction oil boiler diesel combustion engine: 　　 Any quality heat conduction oil boiler diesel combustion engine will produce quality deterioration for a long time at high temperature. During this deterioration process, the carbon pollution and carbon deposits produced by it will adhere The following six hazards are formed on the pipe wall: 　　1. Carbon pollution and carbon deposits have insulation and heat insulation properties. After scaling, the temperature rises slowly, which affects work efficiency.　　2, every millimeter of carbon pollution added to the inner wall of the pipe consumes 20-30% more fuel.　　3. Due to the unequal thickness of carbon pollution in the pipe wall, the temperature of the working surface is uneven and the product quality is affected.　　4. After the formation of carbon pollution and carbon deposits, the acid value rises, causing corrosion of the micro-battery and accelerating the aging and damage of the equipment.　　5. Carbon deposits and carbon pollution are deposited in the pipe bends due to long-term non-cleaning, forming local overheated gas storage, causing pipe cracks or fuel injection, causing fires, and scrapping the boiler diesel burner.　　6. ​​It is beneficial to the regeneration and adjustment of the light oil burner of the heat-conducting oil furnace, and extends the service life of the light oil burner of the heat-conducting oil furnace and the service life of the light oil burner of the heat-conducting oil furnace. The first type of chemical cleaning (cleaning of heat transfer oil boiler diesel burner) adopts my country's patented technology, combined with the particularity of the internal structure of the heat transfer oil heating system, and the persity of materials, to determine the following heat transfer oil furnace light oil burner cleaning plan: 　　 heat transfer oil venting ——Steam flushing——Degreasing——Descaling cleaning——Rinsing——Neutralization and passivation——Steam flushing——Inspection and acceptance——Nitrogen purging——Reset and heating (1) Steam flushing to empty the heat transfer oil in the pipeline, Use steam to flush the inside of the pipeline to remove surface impurities, rust and other dirt.　　(2) Degreasing The purpose of degreasing is to remove oily substances in the system, and to infiltrate and transform the scaled substances, creating conditions for the descaling step. The oil stains originally existed on the surface as a spreading oil film. Under the action of preferential wetting after washing, it gradually shrinks into oil droplets, which are finally washed to leave the surface. (3) Decoking and descaling. This procedure is a key step in chemical cleaning. The purpose is to chemically react with the fouling substances through the formulated special decoking and descaling agent to form water-soluble substances and be taken out of the system by the cleaning liquid. To achieve the purpose of cleaning coke and descaling. The heat transfer oil is heated and coked on the wall tube, and the coke lump is very hard. For many years, our company has drawn a conclusion from the research and practice of coking removal-the coking removal of heat transfer oil should adopt the comprehensive effect of coking removal: solubilization; adsorption ——The adsorption of the surface active agent to the dirt and the surface of the laundry (furnace tube) changes various substances (such as mechanical, electrical, and chemical properties) on the interface and the surface; emulsification——forms a strong interface film, It is conducive to the stability of the emulsion, and the oil stains are not easy to re-precipitate on the surface of the solid (furnace tube). Adding a builder can improve the washing effect. It is conducive to the suspension of dirt particles and prevents the deposition of dirt particles. Together with the effects of temperature (thermal movement) and mechanical force, the optimal washing effect is achieved.　　(4) Rinsing Rinsing is to combine the rinsing liquid prepared according to the regulations with the free ions remaining in the system to further increase the descaling rate and lay a good foundation for the neutralization and passivation process.　　(5) Neutralization The neutralization liquid reacts with the remaining rinsing liquid in the system to make the PH value of the entire heat transfer oil heating system meet the specified requirements.　　(6) Passivation Use passivation liquid to form a complete and dense passivation protective film on the clean metal surface.　　(7) Water rinse after cleaning Ensure that all cleaning agents are exhausted and the inside of the pipe wall is clean. (8) Nitrogen purging In order to remove the residual water flushing in the heat transfer oil heating pipe as much as possible, nitrogen or compressed air can be used for purging. The second type of cleaning process: discharge and remove the old oil → pre-wash → wash → wash ① → wash ② → wash ③ → add new oil → dehydration → normal operation (1) discharge and remove the old oil: use the heating system to remove The heat-conducting oil boiler diesel burner is heated to 70-80℃, and all the heat-conducting oil boiler diesel burners in the system are discharged while it is hot. According to the conditions, the residual oil in the system can be released as much as possible, and a small amount of cleaning agent can be added to penetrate, After peeling and dissolving, the oil becomes thinner and drains out of the system. (2) Pre-washing: Add 2% (70-80 kg, a bag of semi-solid, a bucket of semi-liquid) of the cleaning agent into the system. The solid is dissolved in hot water and added, and the liquid is added at the same time. Put any part of the heating system (usually through the oil pump through the high oil tank, the same way as refueling) into the system, fill the system with clean water, turn on the circulating oil pump to circulate, and use the heating furnace to raise the water temperature to 80℃±5℃, Switch the relevant valves of each reactor in the system to make all parts in the system circulate separately. (3) Cleaning: Add the cleaning agent to the system at 6-8% of the total circulation (in order to ensure the effect, please reserve 50 kg, one bucket and one bag). After the solid is dissolved in hot water, the liquid is added at the same time, the same as (2 ) After putting into the system and filling the system with clean water, turn on the circulating pump to circulate, and use the heating furnace to heat the cleaning agent to 90℃±5℃.　　(4) Water washing: 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, and make all parts of the system circulate separately.　　The third type 　　hot oil boiler diesel burner cleaning construction plan　　1) Steam flushing Empty the heat transfer oil in the pipeline, and flush the inside of the pipeline with steam to remove surface impurities, rust and other dirt.　　2) Degreasing The purpose of degreasing is to remove oily substances in the system, and to infiltrate and transform the scaled substances, creating conditions for the descaling step. The oil stains originally existed on the surface as a spreading oil film. Under the action of preferential wetting after washing, it gradually shrinks into oil droplets, which are finally washed to leave the surface. 3) Decoking and descaling This procedure is a key step in chemical cleaning. The purpose is to chemically react with the fouling substances through the formulated special descaling and descaling agent to form water-soluble substances and be taken out of the system by the cleaning liquid to achieve The purpose of cleaning and descaling.　　4) Rinsing Rinsing is to combine the rinsing liquid prepared according to the regulations with the free ions remaining in the system to further improve the descaling rate and lay a good foundation for the neutralization and passivation process.　　5) Neutralization Use the neutralization liquid to react with the residual rinsing liquid in the system to make the pH value of the entire system meet the specified requirements.　　6) Passivation Use passivation liquid to form a complete and dense passivation protective film on the clean metal surface.　　7) Water rinse after cleaning Ensure that all cleaning agents are exhausted and the inside of the pipe wall is clean.　　8) Inspection and acceptance After the cleaning, the contractor first self-inspects the cleaning quality. After the self-inspection quality is qualified, the inspection and acceptance will be organized jointly with the user. After the inspection is qualified, both parties will sign the cleaning acceptance report.　　9) Nitrogen purging In order to exhaust the residual water in the pipeline as much as possible, nitrogen or compressed air can be used for purging.　　The water-based chemical cleaning agent for the heat transfer oil boiler diesel burner special cleaning agent is a cleaning agent used to clean heavy grease, oil coke, oil sludge and oil stains on the surface of metal machinery in heat transfer equipment. It is compounded by a variety of high-quality surfactants and organic additives. It has excellent permeability, emulsification and oil coke removal ability, has excellent solubility in water, is simple and convenient to use, and can be soaked and sprayed. Various cleaning methods such as showering and recycling are safe and non-corrosive, and can be discharged directly after use. ! 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