Green food refers to pollution-free, safe, high-quality, and nutritious agricultural products. The proper use of fertilizers and other production inputs is a key component in the cultivation of green food. To ensure the quality of these foods and implement effective fertilizer management, this standard has been established.
Appendix A and Appendix B are considered standard annexes. This standard was proposed and managed by the China Green Food Development Center. It was drafted by the Institute of Soil and Fertilizer at the Chinese Academy of Agricultural Sciences. The main contributors to this standard include Li Yuanfang, Zeng Muxiang, Luo Bin, and Wang Huafei.
The scope of this standard outlines the types, compositions, and usage guidelines for fertilizers used in both AA-grade and A-grade green food production. It applies to a wide range of fertilizers, including agricultural fertilizers, commercial organic fertilizers, humic acid fertilizers, microbial fertilizers, semi-organic (organic compound) fertilizers, inorganic (mineral) fertilizers, and foliar fertilizers.
This standard incorporates references from several national standards, such as GB8172-1987, GB/T17419-1998, GB/T17420-1998, NY227-1994, and NY/T391-2000. These references are essential to ensure that the standard remains up-to-date and relevant.
Definitions provided in the standard clarify key terms such as "green food," "AA-grade green food," "A-grade green food," and various types of fertilizers, including farm fertilizers, commodity fertilizers, and others.
Under the section on allowable fertilizer types, it specifies which fertilizers can be used for AA-grade and A-grade green food production. For AA-grade, only specific organic and natural fertilizers are permitted, while for A-grade, limited chemical fertilizers may be used under strict conditions.
The usage rules emphasize the importance of maintaining soil fertility, ensuring environmental safety, and meeting crop nutrient needs. Special attention is given to the application of compost, green manure, microbial fertilizers, and foliar sprays.
Additional provisions outline the requirements for composting farm fertilizers, using local materials, and ensuring that all fertilizers meet quality and safety standards. If any fertilizer causes environmental or crop issues, its use must be halted immediately, and the relevant authority should be notified.
Overall, this standard serves as a comprehensive guide for sustainable and environmentally friendly fertilizer use in the production of high-quality green foods.
The air-cooled induction heating system is an efficient heating solution that combines induction heating technology and the concept of air-cooled heat dissipation. It is mainly used in industrial applications that require fast and precise heating. At the same time, it effectively manages the heat generated during the heating process through forced air cooling, ensuring the stability and safety of the system. This system has a wide range of applications in industries such as metal processing, heat treatment, and electronic manufacturing.
working principle
The air-cooled induction heating system utilizes the principle of electromagnetic induction to generate a changing magnetic field in the induction coil through high-frequency or medium frequency current. This magnetic field excites eddy currents in the target metal workpiece, thereby generating thermal energy and achieving rapid heating of the workpiece. In order to prevent the induction coil and other key components from overheating under high-intensity operation, the system is equipped with a strong air cooling mechanism, which uses fans or blowers to forcibly guide air circulation, take away the heat generated by the equipment, and maintain the temperature of the entire system within a safe range.
system composition
Induction heating unit: comprising an induction coil and a power supply, generating high-frequency or medium frequency magnetic fields.
Air cooling system: composed of a fan or blower, which forces air circulation.
Control system: Adjust heating parameters, monitor temperature, and protect the system from overload.
Workpiece support: Ensure the stability of the workpiece during the heating process.
Advantages and Characteristics
Fast heating: High frequency or medium frequency induction heating, short heating time, high efficiency.
Precise control: By adjusting frequency and power, accurate control of heating depth and temperature can be achieved.
Good safety: The air-cooled design reduces system temperature, prolongs service life, and reduces safety hazards.
Environmental protection and energy conservation: Compared to traditional heating methods, it has lower energy consumption and no emissions of exhaust gas and wastewater.
Flexible application: Suitable for workpieces of various metal materials and sizes.
Application scenarios
Metal heat treatment: surface quenching, welding preparation, hot assembly, etc.
Electronic manufacturing: component soldering on PCB boards, semiconductor packaging.
Automotive industry: Heating of components such as bearings, connecting rods, gears, etc.
Aerospace: Heat treatment of special alloy materials.
Jewelry: Processing and repairing of precious metal products.
Development Trends
With the improvement of industrial automation level, air-cooled induction heating systems are developing towards integration and intelligence, adopting more advanced artificial intelligence and Internet of Things technology to achieve remote monitoring and automation control, improving production efficiency and safety. Meanwhile, customized solutions tailored to specific industries are constantly emerging to meet the diverse needs of the market.
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