Municipal Solid Waste Shredder

Municipal Solid Waste Shredder: Solid Waste Energy Conversion Equipment Enabling RDF/SRF Production

In the field of municipal solid waste treatment and energy utilization, the municipal solid waste shredder is a core pretreatment device connecting municipal solid waste treatment with RDF (waste-derived fuel) and SRF (solid reclaimed fuel) production. Municipal solid waste has a complex composition, including kitchen waste, plastics, paper, textiles, wood, glass, metals, and other materials. This equipment can specifically shred recyclable combustibles in mixed waste (after removing non-combustible materials such as glass and metal) into uniform particles of 15-60mm, providing standard-compliant materials for subsequent sorting, drying, and molding processes in RDF/SRF production. This significantly improves the energy utilization rate of municipal solid waste and reduces landfill volume.

The core structure of the equipment is designed around "adapting to complex waste + meeting fuel production standards," encompassing a multi-functional feeding system, a grading shredding system, an intelligent sorting system, and a temperature and humidity controlled discharge system. The feeding system employs a wide-diameter, anti-clogging hopper, coupled with a hydraulically driven, adjustable-speed pusher. This allows for the handling of large pieces of waste (such as discarded furniture and cardboard boxes) while controlling the pushing force to prevent hard impurities (such as metal blocks and glass) from impacting the blades. The grading and shredding system uses a two-stage structure of "coarse shredding + fine shredding." In the coarse shredding stage, high-torque dual-shaft blade rollers shear large pieces of waste, breaking down the adhesive structures between materials and initially separating easily entangled materials (such as fabrics and plastic films). In the fine shredding stage, fine-toothed alloy blade rollers refine the material to the target particle size. The blade surface is coated with a wear-resistant and corrosion-resistant coating, capable of handling the toughness of plastics, the brittleness of paper, and the hardness of wood simultaneously.

The intelligent sorting system integrates a magnetic sorting device and an airflow sorting module. The magnetic device separates metallic impurities (such as nails and aluminum cans) from the waste, while the airflow sorting module initially separates light combustibles (such as paper and plastics) from heavy non-combustibles (such as glass and stones). The temperature and humidity controlled discharge system uses a combination of air cooling and dehumidification devices to maintain the temperature of the shredded material at a controlled level. The temperature must be below 40℃ and the moisture content controlled below 20% to prevent material spoilage or adhesion due to high temperatures, meeting the initial material requirements for RDF/SRF preparation. During operation, municipal solid waste enters the coarse tearing chamber through the feed hopper, where a dual-shaft cutter roller breaks it into 100-200mm blocks. This is then conveyed to the fine tearing chamber for further refining to 15-60mm particles. During this process, an intelligent sorting system separates impurities such as metal and glass. Finally, after temperature and humidity controlled treatment, the waste is discharged from the outlet, completing the pretreatment process.

Compared to ordinary solid waste shredders, this equipment boasts three core advantages in RDF/SRF production scenarios: First, it has broad material adaptability. Its dual-stage shredding structure and wear-resistant blade design can process over 80% of combustible materials in municipal waste, eliminating the need for pre-sorting and achieving a shredding qualification rate of over 92%. Second, it offers strong fuel compatibility. Through precise particle size control and temperature and humidity control, the output material particle size deviation is ≤8mm, and the moisture content is consistently between 12% and 20%, directly meeting the material standards before RDF/SRF formation, reducing subsequent drying and crushing processes, and lowering overall production costs. Third, it balances energy efficiency and environmental protection. Utilizing a variable frequency dual-motor drive, it automatically adjusts the speed according to the waste composition, achieving a processing capacity of 1000-2500 kg per hour, with unit energy consumption 25% lower than general-purpose shredders. Simultaneously, the sealed chamber and dust collection device reduce the diffusion of odors and dust during shredding, meeting urban environmental protection requirements.

Operation and maintenance must be strictly implemented in accordance with RDF/SRF preparation standards: Before starting the machine, the gap between the fine shredding blades must be adjusted according to the target fuel particle size, and the adsorption intensity of the magnetic sorting device and the wind speed of the airflow sorting module must be checked; when processing waste with high food waste content, the operating power of the humidity control device must be increased to avoid excessive moisture content of the material; in daily maintenance, the residual food waste and fiber fragments in the shredding chamber must be cleaned every 3 days to prevent bacterial growth or blockage of the discharge port; the blade wear must be checked monthly, and the blades must be sharpened or replaced in time when the wear exceeds 3mm; the hydraulic feeding system and sorting device must be calibrated quarterly to ensure that the equipment stably outputs pre-treated materials that meet the requirements of RDF/SRF preparation. Currently, this equipment has been widely used in municipal solid waste incineration plants and solid waste energy treatment centers, becoming a key piece of equipment for the "reduction, harmlessness, and resource utilization" of urban solid waste, and providing solid equipment support for the development of the RDF/SRF industry.