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Original title: Analysis of the difference between centrifugal fan, axial flow fan and mixed flow fan! Fans are mainly used in metallurgy, petrochemical, electric power, urban rail transit, textile, shipping and other fields of the national economy as well as ventilation in various places. In addition to the traditional application fields, it will still have great development prospects in more than 20 potential market fields, such as comprehensive utilization of coal gangue, technical transformation of new dry clinker, energy saving and comprehensive utilization of resources in metallurgical industry. So what are the differences between centrifugal fans, axial fans and mixed flow fans? Today, Xiaobian will take you to analyze the difference between centrifugal fan, axial flow fan and mixed flow fan. 1. Centrifugal fan Relying on the input of mechanical energy, it increases the pressure of gas and exhausts the gas. It is a driven fluid machine. Centrifugal fans are widely used for: (1) Ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; (2) Ventilation and induced draft of boilers and industrial furnaces; (3) Cooling and ventilation in air conditioning and household appliances; (4) drying and selecting the grains; (5) Wind source of wind tunnel and inflation and propulsion of hovercraft. Fans are mainly used in metallurgy, petrochemical, electric power, urban rail transit, textile, shipping and other fields of the national economy as well as ventilation in various places. In addition to the traditional application fields, it will still have great development prospects in more than 20 potential market fields, such as comprehensive utilization of coal gangue, technical transformation of new dry clinker, energy saving and comprehensive utilization of resources in metallurgical industry. So what are the differences between centrifugal fans, axial fans and mixed flow fans? Today, Xiaobian will take you to analyze the difference between centrifugal fan, axial flow fan and mixed flow fan. 1. Centrifugal fan Relying on the input of mechanical energy, it increases the pressure of gas and exhausts the gas. It is a driven fluid machine. Centrifugal fans are widely used for: (1) Ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; (3) Cooling and ventilation in air conditioning and household appliances; (4) drying and selecting the grains; (5) Wind source of wind tunnel and inflation and propulsion of hovercraft. Expand the full text 2. Axial flow fan It is the airflow in the same direction as the axis of the fan blade, such as the electric fan, and the fan outside the air conditioner is an axial-flow fan. It is called “axial flow” because the gas flows parallel to the axis of the fan. Axial flow fans are usually used in applications with high flow requirements and low pressure requirements. The axial fan holds the position and moves the air. Characteristic Small axial flow fan: low power consumption,molecular distillation systems, fast heat dissipation, low noise, energy saving and environmental protection. Because of its small size, it has a wide range of uses. Large axial flow fan: It has the characteristics of simple structure, stability and reliability, low noise, large air volume and wide range of function selection. 2. Axial flow fan It is the airflow in the same direction as the axis of the fan blade, such as the electric fan, and the fan outside the air conditioner is an axial-flow fan. It is called “axial flow” because the gas flows parallel to the axis of the fan. Axial flow fans are usually used in applications with high flow requirements and low pressure requirements. The axial fan holds the position and moves the air. Characteristic Small axial flow fan: low power consumption, fast heat dissipation, low noise, energy saving and environmental protection. Because of its small size, it has a wide range of uses. Large axial flow fan: It has the characteristics of simple structure, stability and reliability,nutsche filter dryer, low noise, large air volume and wide range of function selection. 3. Diagonal fan/mixed flow fan A fan between an axial flow fan and a centrifugal fan. The impeller of a diagonal flow fan allows the air to move both centrifugally and axially. The movement of the air in the shell is a mixture of axial and centrifugal movements. Combines the characteristics of both axial and centrifugal fans, although it looks more like a conventional axial fan. The curved plate-shaped blade is welded to the conical steel hub. The flow is varied by changing the blade angle in the inlet housing upstream of the impeller. The enclosure may have an open entrance, but more commonly, it has a right-angled curved shape that allows the motor to be placed outside the duct. The drain shell expands slowly to slow the flow of air or gas and convert the kinetic energy into useful static pressure. Mainly used for mine ventilation and tunnel ventilation.
Combines the characteristics of both axial and centrifugal fans, although it looks more like a conventional axial fan. The curved plate-shaped blade is welded to the conical steel hub. The flow is varied by changing the blade angle in the inlet housing upstream of the impeller. The enclosure may have an open entrance, but more commonly, it has a right-angled curved shape that allows the motor to be placed outside the duct. The drain shell expands slowly to slow the flow of air or gas and convert the kinetic energy into useful static pressure. Mainly used for mine ventilation and tunnel ventilation. Difference The wind pressure coefficient of the mixed flow fan is higher than that of the axial flow fan, and the flow coefficient is larger than that of the centrifugal fan, which fills the gap between the axial flow fan and the mixed flow fan. There is an obvious difference between the centrifugal fan and the axial flow fan when they are started. The operating power of the centrifugal fan increases with the increase of the air volume. Therefore, when the centrifugal fan is started, the air door should be fully closed and then gradually opened to avoid burning the fan due to excessive current. The operating power of the axial flow fan decreases with the increase of the air volume, so when the axial flow fan is started, the air door should be fully opened, and then gradually closed to the required air volume value. Diagonal flow (mixed flow) fan: 1. The wind pressure coefficient is higher than the axial flow fan, and the flow coefficient is larger than the centrifugal fan. And 2, the blank between the axial flow fan and the centrifugal fan is filled. And 3, that installation is simple and convenient. Difference between centrifugal fan and axial fan during startup: The operating power of the centrifugal fan increases with the increase of the air volume, so the air door should be fully closed when the centrifugal fan is started, and then gradually opened to avoid burning the motor due to excessive current of the fan. The operating power of the axial flow fan decreases with the increase of the air volume, so when the axial flow fan is started, the air door should be fully opened, and then gradually closed to the required air volume value. Difference between centrifugal fan and axial fan during startup: The operating power of the centrifugal fan increases with the increase of the air volume, so the air door should be fully closed when the centrifugal fan is started, and then gradually opened to avoid burning the motor due to excessive current of the fan. The operating power of the axial flow fan decreases with the increase of the air volume, so when the axial flow fan is started, the air door should be fully opened, and then gradually closed to the required air volume value. The role of two types of axial and centrifugal fans in mechanical ventilation: 1. Due to the large difference between air temperature and grain temperature, the first ventilation time should be selected in the daytime to reduce the difference between grain temperature and air temperature and reduce the occurrence of condensation. The future ventilation shall be carried out at night as far as possible, hemp extraction centrifuge ,wiped film evaporator, because this ventilation is mainly for cooling, and the atmospheric humidity is relatively high and the temperature is low at night, which not only reduces the water loss, but also makes full use of the low temperature at night and improves the cooling effect. 2. In the initial stage of ventilation with a centrifugal fan, there may be condensation on doors, windows and walls, or even slight condensation on the surface of the grain. Just stop the fan, open the window, turn on the axial flow fan, turn over the grain surface if necessary, and remove the humid and hot air from the warehouse. However, if the axial flow fan is used for slow ventilation, the condensation phenomenon will not occur, only the grain temperature in the middle and upper layers will rise slowly, and the grain temperature will drop steadily with the continuation of ventilation. 3. When the axial flow fan is used for slow ventilation, because the air volume of the axial flow fan is small, and the grain is a poor conductor of heat, it is easy to have slow ventilation in some parts in the early stage of ventilation, and the grain temperature in the whole warehouse will gradually balance with the continuation of ventilation. 4. The grain for slow ventilation must be cleaned by the vibrating screen, and the grain entering the warehouse must be cleaned in time in the impurity area caused by automatic grading, otherwise it is easy to cause uneven local ventilation. 5. Calculation of energy consumption: The No.14 warehouse was ventilated with axial flow fan for 50 days, 15 hours per day on average, and shared 750 hours. The moisture content was reduced by 0.4% on average, the grain temperature was reduced by 23.1 degrees on average, and the unit energy consumption was 0.027 kw. H/t. ℃. 。 The 28 # warehouse was ventilated for 6 days and shared for 126 hours. The average moisture content was reduced by 1.0%, the average temperature was reduced by 20.3 ℃, and the unit energy consumption was 0.038 kw. H/t. ℃. 。 5. Advantages of slow ventilation with axial flow fan: good cooling effect; low unit energy consumption, which is particularly important in today’s advocacy of energy saving; easy to grasp the ventilation time, which is not easy to dew; no need to equip a separate fan, which is convenient and flexible.
Disadvantages: Due to small air volume and long ventilation time, the precipitation effect is not obvious, and the axial flow fan is not suitable for ventilation in places with high moisture content. 6. Advantages of the centrifugal fan: obvious cooling and precipitation effects and short ventilation time; Disadvantages: high unit energy consumption; poor ventilation timing is prone to condensation. Conclusion: In the ventilation for the purpose of cooling, the axial flow fan should be used for safe, efficient and energy-saving slow ventilation; in the ventilation for the purpose of precipitation, the centrifugal fan should be used. Difference The wind pressure coefficient of the mixed flow fan is higher than that of the axial flow fan, and the flow coefficient is larger than that of the centrifugal fan, which fills the gap between the axial flow fan and the mixed flow fan. There is an obvious difference between the centrifugal fan and the axial flow fan when they are started. The operating power of the centrifugal fan increases with the increase of the air volume. Therefore, when the centrifugal fan is started, the air door should be fully closed and then gradually opened to avoid burning the fan due to excessive current. The operating power of the axial flow fan decreases with the increase of the air volume, so when the axial flow fan is started, the air door should be fully opened, and then gradually closed to the required air volume value. Diagonal flow (mixed flow) fan: 1. The wind pressure coefficient is higher than the axial flow fan, and the flow coefficient is larger than the centrifugal fan. And 2, the blank between the axial flow fan and the centrifugal fan is filled. And 3, that installation is simple and convenient. Difference between centrifugal fan and axial fan during startup: The operating power of the centrifugal fan increases with the increase of the air volume, so the air door should be fully closed when the centrifugal fan is started, and then gradually opened to avoid burning the motor due to excessive current of the fan. The operating power of the axial flow fan decreases with the increase of the air volume, so when the axial flow fan is started, the air door should be fully opened, and then gradually closed to the required air volume value. Difference between centrifugal fan and axial fan during startup: The operating power of the centrifugal fan increases with the increase of the air volume, so the air door should be fully closed when the centrifugal fan is started, and then gradually opened to avoid burning the motor due to excessive current of the fan. The operating power of the axial flow fan decreases with the increase of the air volume, so when the axial flow fan is started, the air door should be fully opened, and then gradually closed to the required air volume value. The role of two types of axial and centrifugal fans in mechanical ventilation: 1. Due to the large difference between air temperature and grain temperature, the first ventilation time should be selected in the daytime to reduce the difference between grain temperature and air temperature and reduce the occurrence of condensation. The future ventilation shall be carried out at night as far as possible, because this ventilation is mainly for cooling, and the atmospheric humidity is relatively high and the temperature is low at night, which not only reduces the water loss, but also makes full use of the low temperature at night and improves the cooling effect. 2. In the initial stage of ventilation with a centrifugal fan, there may be condensation on doors, windows and walls, or even slight condensation on the surface of the grain. Just stop the fan, open the window, turn on the axial flow fan, turn over the grain surface if necessary, and remove the humid and hot air from the warehouse. However, if the axial flow fan is used for slow ventilation, the condensation phenomenon will not occur, only the grain temperature in the middle and upper layers will rise slowly, and the grain temperature will drop steadily with the continuation of ventilation. 3. When the axial flow fan is used for slow ventilation, because the air volume of the axial flow fan is small, and the grain is a poor conductor of heat, it is easy to have slow ventilation in some parts in the early stage of ventilation, and the grain temperature in the whole warehouse will gradually balance with the continuation of ventilation. 4. The grain for slow ventilation must be cleaned by the vibrating screen, and the grain entering the warehouse must be cleaned in time in the impurity area caused by automatic grading, otherwise it is easy to cause uneven local ventilation. 5. Calculation of energy consumption: The No.14 warehouse was ventilated with axial flow fan for 50 days, 15 hours per day on average, and shared 750 hours. The moisture content was reduced by 0.4% on average, the grain temperature was reduced by 23.1 degrees on average, and the unit energy consumption was 0.027 kw. H/t. ℃. 。 The 28 # warehouse was ventilated for 6 days and shared for 126 hours. The average moisture content was reduced by 1.0%, the average temperature was reduced by 20.3 ℃, and the unit energy consumption was 0.038 kw. H/t. ℃. 。 5. Advantages of slow ventilation with axial flow fan: good cooling effect; low unit energy consumption, which is particularly important in today’s advocacy of energy saving; easy to grasp the ventilation time, which is not easy to dew; no need to equip a separate fan, which is convenient and flexible. Disadvantages: Due to small air volume and long ventilation time, the precipitation effect is not obvious, and the axial flow fan is not suitable for ventilation in places with high moisture content.
6. Advantages of the centrifugal fan: obvious cooling and precipitation effects and short ventilation time; Disadvantages: high unit energy consumption; poor ventilation timing is prone to condensation. Conclusion: In the ventilation for the purpose of cooling,jacketed glass reactor, the axial flow fan should be used for safe, efficient and energy-saving slow ventilation; in the ventilation for the purpose of precipitation, the centrifugal fan should be used. Return to Sohu to see more Responsible Editor:. toptiontech.com