1 Introduction The promotion of motor speed regulation and energy saving technology has long been included in the relevant provisions of the “Energy Conservation Law of the People's Republic of Chinaâ€, while the frequency converter speed control technology is small in size, light in weight, simple in installation and operation, reliable in data, stable in performance, and energy-saving. The effect is obvious and so on, and it is the leader in various speed control technologies. Therefore, a large number of fans, pumps, air compressors and other adjustable flow loads using frequency conversion speed control technology have achieved obvious results. With its superior control performance, flexible operation mode and powerful software functions, Danfoss VLT5000 frequency converter is increasingly used in transmission machinery in various industries, improving labor productivity and improving process control process. At the same time Danfoss VLT6000HVAC, VLT7000Booster and VLT8000Aqua inverters and their special software are introduced for adjustable flow loads such as fans, pumps and air compressors in heating, ventilation, air conditioning (HVAC), constant pressure water supply, water industry and other industries. With their reliable manufacturing quality, unique energy optimization function (AEO) and extremely strong harmonic suppression capability, they are rapidly becoming widely used, providing users with reasonable solutions more and more conveniently, and thus maximizing energy saving. Consumption.
2 Constant pressure water supply system In some new construction and renovation projects, variable frequency constant pressure water supply has replaced the high water tank, and its energy saving, convenience and sanitation are obvious to all. The advantage of variable frequency constant pressure water supply is that it can not only ensure sufficient water pressure, but also not affect the quality of water due to changes in outdoor air and temperature. The variable frequency constant pressure water supply system consisting mainly of Danfoss VLT7000 inverter and MCT10 software has built-in multi-pump controller, which saves people from using PLC regularly. It can control 7 pumps at the same time in 8 fixed variable frequency pump control modes. Four pumps are controlled in six cycle variable frequency pump control modes. The energy optimization function (AEO) of the frequency converter can save energy and maximize efficiency. It also has the function of preventing electromagnetic interference and suppressing higher harmonics. It also has a sleep mode/auxiliary pump function; it has a reinforced coating and is resistant. Harsh environment.
3 Water industry The increasing demand for pure water, as well as the shortage of pure water resources in the world and the pressure of sewage treatment and recycling, the energy conservation has become the focus of attention, which requires global efforts to protect Water and energy are these precious natural resources. Decades of experience have proven that it is an effective means to achieve variable frequency speed control of AC motors in terms of water resources management control and energy conservation.
From drinking water to wastewater treatment, Danfoss has proven technologies and products that optimize available water and wastewater treatment processes and save significant energy.
3.1 Drinking water In the treatment and distribution of drinking water, there are many places such as pumping water, mixed water and some mechanical processes benefit from the frequency converter. They use the frequency converter to control the speed of the motor, save energy and optimize the process. Using a frequency converter to control pump water pumping to a water treatment plant can reduce the occurrence of system water flow urgency, which can improve the processing of the entire system; in addition, the number of starts and stops of the machine is also reduced a lot, and the "soft start" provided by the inverter technology is Saving energy also reduces machine wear and tear.
The use of frequency converters on the pumping station also gives potential room for improvement in the efficiency of the water distribution system. When the frequency converter is applied to the pumping station, the water storage tank is not needed, and the water distribution pipeline is always under the correct pressure, and the water leakage of the pipeline is also avoided.
3.2 Sewage Treatment Sewage treatment is a relatively complex process involving many different types of equipment that can be operated to increase operational efficiency through the use of frequency converters. Similar to drinking water treatment, frequency converters used in pumping station systems can control the flow of sewage into wastewater treatment plants and processes. This reduces the maintenance of the pump because the number of starts and soft starts of the pump motor is reduced, energy is also saved, the process is optimized and the work efficiency is increased.
Without the energy loss caused by too many valves, the reverse activated sludge flow rate can be better controlled. The agitation speed of the coagulation and coagulation processes can also be well controlled, which results in better process control and energy savings. The use of frequency converters on blowers and pumps reduces the flow of water and reduces energy losses because there is no energy loss due to the throttle that occurs in the piping system. Similarly, the application of the frequency converter to a centrifugal sludge dewatering machine can also significantly save energy, because these equipments need to change the speed of the centrifuge due to the decrease in sludge humidity or the increase in sludge dewatering rate.
In a large number of wastewater treatment equipment and treatment processes, the VLT8000 Aqua and soft start MCD 3000 systems provide maximum energy savings, reduced maintenance costs, reduced investment costs and improved control of the process.
In addition, in other applications, the VLT8000 inverter targets multiple types of loads between pure constant torque load and pure variable torque load, such as heavy duty centrifuges, variable displacement vacuum pumps, sewage dumpers, and heavy solid sludge. Pumps, deep well submersible pumps, mixers, air compressors, Roots blowers, etc. If such equipment uses the same frequency converter and water pump dedicated inverter, the price is certainly cheap, but the start is more difficult, sometimes overload; if the same gear constant torque Inverter, although the process performance can meet the requirements, but the price is high. VLT8000 frequency converter just makes up for the above shortcomings, and meets the needs of energy-saving and consumption-reducing of such load with the optimal cost performance.
4 The heating and ventilation air conditioner variable frequency drive has been used in the industrial field for many years due to its powerful process control capability. It has the characteristics of precise control and large energy saving, so it has become the standard control method for heating, ventilation and air conditioning systems. .
4.1 Applications in central air conditioning systems The issues to be considered when installing frequency converters in central air conditioning systems are completely different from industrial applications. In general, large electronic sensitive devices such as computers are used in high-end public facilities equipped with central air conditioning. System, television receiving system and telecommunication network system. This requires special requirements for the variable frequency drive that do not need to be considered in the industrial environment, and the Danfoss VLT6000HVAC inverter has many advantages to solve these problems.
The central air-conditioning green intelligent control system based on VLT6000HVAC can realize centralized control of various parameters such as temperature, temperature difference, pressure, differential pressure, humidity and flow. The unique automatic energy optimization function (AEO) can make the HVAC system The comprehensive power saving rate is about 50%, which is 3%-10% more than the traditional inverter used in HVAC systems. At the same time, due to good electromagnetic compatibility, it can reduce interference to peripheral circuit instruments and reduce noise. The built-in DC reactor can effectively suppress harmonics and improve power factor. This is widely used in high-end occasions such as airports, radio and television buildings, hospitals, and subways. The system integrates data sensing, dual PID control and control execution. The feedback value and set value can be set directly according to the unit. The built-in RS485 communication protocol can directly receive the FLN protocol of John Son ControlN2 and Landis & Staefa, and stay. Profibus and Lon Works option interfaces have successfully solved the problem of the complicated configuration of traditional inverters used in HVAC systems. It can realize four kinds of operation modes conversion in spring, summer, autumn and winter. It has multiple control functions of remote control and on-site control. It can meet the requirements of building self-control on fan and water pump without losing the flexibility of on-site operation when building automation system fails. Sex. The fan and water pump has soft start soft stop, multi-level password protection, fire interlock automatic closing fan and other functions, allowing motor cable connection up to 300m, and has power consumption, fault phenomenon running time recorder, greatly simplifying central air conditioning System-aisking design work and initial design of equipment in the traditional design mode.
4.2 Application in heating system In the heating system, Danfoss VLT6000HVAC inverter can be used for heat pump circulation pump, make-up pump and boiler room, such as drum fan, circulation pump, energy consumption, air volume adjustment, heat regulation The network heating quality is stable and efficient, which can effectively avoid the problem of local heating network overheating and overheating. It can also eliminate the noise generated by the damper fan damper, reduce the labor intensity of workers, and greatly reduce the maintenance cost of the system. Because the built-in DC reactor of VLT inverter can make the power factor close to 1, it can effectively suppress harmonics and avoid electromagnetic interference to surrounding equipment. More importantly, it has automatic energy optimization function, which can save a lot of energy.
5 Conclusion China has a vast territory, a large population, and extremely scarce hydropower resources. Due to historical and economic reasons, most water industry systems and HVAC systems do not have economic operating conditions, and energy waste is very serious. These systems are in urgent need of transformation. We should make full use of the existing variable frequency speed control technology, and continue to learn new technologies, and strive to save energy and protect the environment, and make due contributions to China's economic construction. (Zhang Wei)
:
2 Constant pressure water supply system In some new construction and renovation projects, variable frequency constant pressure water supply has replaced the high water tank, and its energy saving, convenience and sanitation are obvious to all. The advantage of variable frequency constant pressure water supply is that it can not only ensure sufficient water pressure, but also not affect the quality of water due to changes in outdoor air and temperature. The variable frequency constant pressure water supply system consisting mainly of Danfoss VLT7000 inverter and MCT10 software has built-in multi-pump controller, which saves people from using PLC regularly. It can control 7 pumps at the same time in 8 fixed variable frequency pump control modes. Four pumps are controlled in six cycle variable frequency pump control modes. The energy optimization function (AEO) of the frequency converter can save energy and maximize efficiency. It also has the function of preventing electromagnetic interference and suppressing higher harmonics. It also has a sleep mode/auxiliary pump function; it has a reinforced coating and is resistant. Harsh environment.
3 Water industry The increasing demand for pure water, as well as the shortage of pure water resources in the world and the pressure of sewage treatment and recycling, the energy conservation has become the focus of attention, which requires global efforts to protect Water and energy are these precious natural resources. Decades of experience have proven that it is an effective means to achieve variable frequency speed control of AC motors in terms of water resources management control and energy conservation.
From drinking water to wastewater treatment, Danfoss has proven technologies and products that optimize available water and wastewater treatment processes and save significant energy.
3.1 Drinking water In the treatment and distribution of drinking water, there are many places such as pumping water, mixed water and some mechanical processes benefit from the frequency converter. They use the frequency converter to control the speed of the motor, save energy and optimize the process. Using a frequency converter to control pump water pumping to a water treatment plant can reduce the occurrence of system water flow urgency, which can improve the processing of the entire system; in addition, the number of starts and stops of the machine is also reduced a lot, and the "soft start" provided by the inverter technology is Saving energy also reduces machine wear and tear.
The use of frequency converters on the pumping station also gives potential room for improvement in the efficiency of the water distribution system. When the frequency converter is applied to the pumping station, the water storage tank is not needed, and the water distribution pipeline is always under the correct pressure, and the water leakage of the pipeline is also avoided.
3.2 Sewage Treatment Sewage treatment is a relatively complex process involving many different types of equipment that can be operated to increase operational efficiency through the use of frequency converters. Similar to drinking water treatment, frequency converters used in pumping station systems can control the flow of sewage into wastewater treatment plants and processes. This reduces the maintenance of the pump because the number of starts and soft starts of the pump motor is reduced, energy is also saved, the process is optimized and the work efficiency is increased.
Without the energy loss caused by too many valves, the reverse activated sludge flow rate can be better controlled. The agitation speed of the coagulation and coagulation processes can also be well controlled, which results in better process control and energy savings. The use of frequency converters on blowers and pumps reduces the flow of water and reduces energy losses because there is no energy loss due to the throttle that occurs in the piping system. Similarly, the application of the frequency converter to a centrifugal sludge dewatering machine can also significantly save energy, because these equipments need to change the speed of the centrifuge due to the decrease in sludge humidity or the increase in sludge dewatering rate.
In a large number of wastewater treatment equipment and treatment processes, the VLT8000 Aqua and soft start MCD 3000 systems provide maximum energy savings, reduced maintenance costs, reduced investment costs and improved control of the process.
In addition, in other applications, the VLT8000 inverter targets multiple types of loads between pure constant torque load and pure variable torque load, such as heavy duty centrifuges, variable displacement vacuum pumps, sewage dumpers, and heavy solid sludge. Pumps, deep well submersible pumps, mixers, air compressors, Roots blowers, etc. If such equipment uses the same frequency converter and water pump dedicated inverter, the price is certainly cheap, but the start is more difficult, sometimes overload; if the same gear constant torque Inverter, although the process performance can meet the requirements, but the price is high. VLT8000 frequency converter just makes up for the above shortcomings, and meets the needs of energy-saving and consumption-reducing of such load with the optimal cost performance.
4 The heating and ventilation air conditioner variable frequency drive has been used in the industrial field for many years due to its powerful process control capability. It has the characteristics of precise control and large energy saving, so it has become the standard control method for heating, ventilation and air conditioning systems. .
4.1 Applications in central air conditioning systems The issues to be considered when installing frequency converters in central air conditioning systems are completely different from industrial applications. In general, large electronic sensitive devices such as computers are used in high-end public facilities equipped with central air conditioning. System, television receiving system and telecommunication network system. This requires special requirements for the variable frequency drive that do not need to be considered in the industrial environment, and the Danfoss VLT6000HVAC inverter has many advantages to solve these problems.
The central air-conditioning green intelligent control system based on VLT6000HVAC can realize centralized control of various parameters such as temperature, temperature difference, pressure, differential pressure, humidity and flow. The unique automatic energy optimization function (AEO) can make the HVAC system The comprehensive power saving rate is about 50%, which is 3%-10% more than the traditional inverter used in HVAC systems. At the same time, due to good electromagnetic compatibility, it can reduce interference to peripheral circuit instruments and reduce noise. The built-in DC reactor can effectively suppress harmonics and improve power factor. This is widely used in high-end occasions such as airports, radio and television buildings, hospitals, and subways. The system integrates data sensing, dual PID control and control execution. The feedback value and set value can be set directly according to the unit. The built-in RS485 communication protocol can directly receive the FLN protocol of John Son ControlN2 and Landis & Staefa, and stay. Profibus and Lon Works option interfaces have successfully solved the problem of the complicated configuration of traditional inverters used in HVAC systems. It can realize four kinds of operation modes conversion in spring, summer, autumn and winter. It has multiple control functions of remote control and on-site control. It can meet the requirements of building self-control on fan and water pump without losing the flexibility of on-site operation when building automation system fails. Sex. The fan and water pump has soft start soft stop, multi-level password protection, fire interlock automatic closing fan and other functions, allowing motor cable connection up to 300m, and has power consumption, fault phenomenon running time recorder, greatly simplifying central air conditioning System-aisking design work and initial design of equipment in the traditional design mode.
4.2 Application in heating system In the heating system, Danfoss VLT6000HVAC inverter can be used for heat pump circulation pump, make-up pump and boiler room, such as drum fan, circulation pump, energy consumption, air volume adjustment, heat regulation The network heating quality is stable and efficient, which can effectively avoid the problem of local heating network overheating and overheating. It can also eliminate the noise generated by the damper fan damper, reduce the labor intensity of workers, and greatly reduce the maintenance cost of the system. Because the built-in DC reactor of VLT inverter can make the power factor close to 1, it can effectively suppress harmonics and avoid electromagnetic interference to surrounding equipment. More importantly, it has automatic energy optimization function, which can save a lot of energy.
5 Conclusion China has a vast territory, a large population, and extremely scarce hydropower resources. Due to historical and economic reasons, most water industry systems and HVAC systems do not have economic operating conditions, and energy waste is very serious. These systems are in urgent need of transformation. We should make full use of the existing variable frequency speed control technology, and continue to learn new technologies, and strive to save energy and protect the environment, and make due contributions to China's economic construction. (Zhang Wei)
:
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