Green food refers to products that are free from pollution, safe, high-quality, and rich in nutrients. The proper use of fertilizers and other agricultural inputs plays a crucial role in the production of green food. To ensure the quality of green food and implement effective management of fertilizers used in its production, this standard has been established.
Appendix A and Appendix B are considered standard appendices under this document. This standard was proposed and is managed by the China Green Food Development Center. It was drafted by the Soil and Fertilizer Institute of 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 guidelines for fertilizer use in both AA-grade and A-grade green foods. It applies to various types of fertilizers, including agricultural fertilizers, commercial organic fertilizers, humic acid fertilizers, microbial fertilizers, semi-organic (organic compound) fertilizers, inorganic (mineral) fertilizers, and foliar fertilizers used in the production of AA and A-grade green foods.
This standard incorporates references to several national standards, such as GB8172-1987, GB/T17419-1998, GB/T17420-1998, NY227-1994, and NY/T391-2000. These standards are essential for ensuring compliance and maintaining quality. All parties using this standard are encouraged to refer to the latest editions of these documents.
Definitions provided in this standard clarify key terms like "green food," "AA-grade green food," "A-grade green food," "farm fertilizer," "compost," "manure," "biogas fertilizer," "green manure," "crop straw fertilizer," "mud fertilizer," "cake fertilizer," "commercial fertilizer," and others. Each definition explains the characteristics, sources, and usage guidelines of different fertilizer types.
The standard also outlines the allowable types of fertilizers for AA and A-grade green food production. For AA-grade, only farm fertilizers and specific commercial fertilizers are permitted, while for A-grade, a broader range of fertilizers is allowed, with certain restrictions on chemical inputs.
Fertilizer application must meet crop nutrient needs, replenish soil organic matter, and maintain or enhance soil fertility and biological activity. It should not harm the environment or affect crop quality, taste, or resistance.
For AA-grade green food, strict rules apply: no synthetic fertilizers, no harmful waste materials, and careful use of compost, green manure, and microbial fertilizers. For A-grade, fertilizers must be used in conjunction with organic materials, with a limit on the ratio of organic to inorganic nitrogen.
Additional provisions emphasize the importance of proper composting, detoxification of municipal waste, and monitoring for environmental impact. If any negative effects are observed, fertilizer use must be stopped immediately, and the issue reported to the relevant authority.
Overall, this standard serves as a comprehensive guide to ensure the sustainability, safety, and quality of green food production through responsible and regulated fertilizer use.
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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