Port energy-saving equipment suppliers remind you that the rapid development of global logistics has accelerated the circulation of port goods. Large equipment in ports needs to complete corresponding vertical movements during operation, which consumes a lot of energy and generates a large amount of renewable energy from large lifting equipment. Only by exploring energy-saving and emission reducing technologies for large lifting equipment can we meet China's energy-saving and emission reduction requirements.
Adopting energy-saving and consumption reducing technologies in the main circuit and circuit control mode
The internal main circuit voltage structure of large lifting machinery in ports usually adopts a three-phase half bridge voltage converter. The rectifier of the three-phase half bridge voltage converter is composed of a topological structure, and the voltage structure of the AC side has super stability. Its internal structure does not have a neutral connection and operates in a three phase symmetrical internal structure. The three-phase half bridge voltage converter can be simultaneously controlled by six IGBT power switches during operation, with strong operability. By installing a network measurement filter inside the rectifier topology, high-order harmonics inside can be observed through external devices of the rectifier. The unit power of the main circuit is affected by factor rectification. On the AC side of the main circuit, a power grid with the same circuit voltage is adopted. When the unit power factor becomes inverted, the current of the AC side main circuit differs from the unit power voltage by about 180 °.
In order to achieve energy conservation and consumption reduction during construction operations of large lifting machinery, relevant technologies can be adopted to control the current and voltage of the main circuit first. When operating mechanical equipment, change the original three-phase half bridge voltage type controller, that is, replace the original PWM rectifier with a PI controller, change the current parameters at the rotation coordinates of the rectifier, so that the original AC side current becomes a constant DC current, and adjust the entire circuit system without error. By changing the current of the main circuit, the goal of energy saving and consumption reduction can be achieved. The control mode of the circuit can also be changed by controlling the current size, and the control mode of the circuit can be adjusted through constant direct current technology. In the actual operation of large lifting machinery equipment, the filtering capacitance inside the circuit will detect the voltage and voltage inside the circuit based on the power of the reactive current component.
Accurate measurement and detection of voltage amplitude can also be carried out, and the energy value of the original circuit can be changed by the current frequency of the internal circuit, so that the energy value controlled by the circuit is in a constant state, ensuring that the current on the AC side is active current, improving the stability of the circuit system, and ensuring the operation status of the power factor of the system. The setting of communication technology can also achieve the goal of energy conservation and consumption reduction. The communication mode and communication equipment current in circuit control are mainly controlled by the main control system. In the process of communication control, the main circuit can use the form of sending reactive power commands to complete the link and application of reactive power compensation. This not only enables large lifting equipment to achieve energy saving and consumption reduction during construction operations, but also has a certain impact on the stability of the internal circuit system of large lifting equipment.
Using energy feedback devices to adopt energy-saving and consumption reducing technologies
Large lifting machinery equipment will carry containers to load goods during construction operations, and the fixed storage site for containers is usually used for construction operations using large lifting machinery such as tire cranes. Its internal devices mainly consist of large vehicles, small vehicles, and lifting devices. Install a frequency converter device on the internal system of the container, control the current with a frequency converter on the inner side of the container. When adjusting the speed of the equipment, the frequency converter is installed and placed upside down, with the DC bus inside the container as the installation control point. The braking method is changed from the original basic braking method, and braking is carried out in the form of a braking resistor. The above is the principle of energy feedback device for large lifting machinery equipment during construction operations.
Energy saving and consumption reducing technologies are adopted in the energy feedback device. By reforming the original energy feedback device and controlling the contactor, the uncontrolled rectification system and energy feedback device can be freely adjusted. During the operation of mechanical equipment, the energy feedback device and uncontrolled rectification system are adjusted. In the event of an accident or malfunction of large lifting equipment, the switch controller of the uncontrolled rectification system can be immediately cut off. The energy feedback system can also be used for inspection to avoid damage to large lifting machinery caused by equipment failure. It can also ensure the personal safety of construction workers and improve the safety and reliability of port operations. In the investigation of large-scale lifting equipment in ports, it was found that installing energy feedback devices in 75 ton ship loaders and using uncontrolled current systems in steel plate ship loaders. Through comparison, it was found that ship loaders equipped with uncontrolled current systems and energy feedback devices significantly saved electricity compared to those without devices, and construction operations in a short period of time could save more than 35% of electricity consumption.
Through the above comparative research, it has been found that installing energy feedback devices inside large lifting equipment can provide insights into the operation status of the machinery through energy feedback, and can also save electricity consumption, achieving the goal of energy conservation and consumption reduction. By installing energy feedback devices on containers, operators can monitor the status of internal components of mechanical equipment at any time. Once abnormalities are found in the internal devices, relevant technical personnel can be immediately invited to inspect and repair them, avoiding construction errors caused by the instability of the container's internal system, reducing the frequency of secondary rework, and achieving energy-saving and consumption reducing effects to a certain extent.
Through the study of energy feedback devices, the internal structure of traditional large-scale lifting equipment has been improved, reducing errors during construction operations and significantly improving the work efficiency of large-scale lifting equipment. Through experiments, it has been shown that whether installing energy feedback devices on large loading and unloading ships, large loading and unloading machines, or large tire machines in ports, through the setting of technical systems, operators can grasp the internal conditions of mechanical equipment at any time, significantly improving the work efficiency of large lifting equipment and also having a certain impact on the economic benefits of ports, playing a role in energy conservation and consumption reduction to a certain extent.
With the continuous development of China's foreign trade economy, the demand for energy and materials in port trade is increasing. Applying energy-saving and consumption reducing technologies to large-scale lifting equipment in ports is in line with the basic awareness of energy conservation in modern society and the strategy of sustainable development. Energy saving and consumption reducing technologies can be adopted in the main circuit and circuit control, by changing the current of mechanical equipment through external device technology of circuit rectifiers. Energy feedback devices can also be installed to constantly monitor the internal conditions of mechanical equipment, reduce equipment operation errors, improve the accuracy of large-scale lifting equipment construction, and achieve the goal of energy saving and consumption reduction.