Air expansion refrigeration low temperature pulverization air expansion refrigeration technology is an aviation technology, and now many research and development units in China have used this technology in the low temperature production process of rubber powder. After years of efforts, China 609 Research Institute has successfully produced a 10,000-ton fine rubber powder production device using air circulation low-temperature pulverization method, and built a plant in Nanjing. It has large output, low production cost, no pollution, and automatic operation. . The core technology of the pulverization method is the application of air turbine expansion refrigeration technology in the low-temperature pulverization of waste rubber in the rubber industry. Figures 2-17 are their cryogenic pulverization systems. The basic principle is that the air is compressed in the air compressor to a certain pressure. After separation and drying, it enters the expansion machine coaxial compressor for secondary compression, and then passes through the secondary compression, and enters the heat exchange equipment for hot and cold exchange, reducing The temperature is expanded and cooled by a turbo expander, and the temperature reaches below 120 ° C. At the same time, the used tires are often coarsely crushed and finely crushed, and the steel wire and the fiber are removed by magnetic separation, air separation and sieving to obtain a particle diameter of 2 to 4 mm. Colloidal particles. The rubber particles are dynamically frozen in a chilled fluidized bed with cold air to bring the temperature below the glass transition temperature.
After being crushed and tempered by a low-temperature pulverizer, it is separated, and the rubber powder is packed into a warehouse for classification; the air is returned to the air compressor for recycling. The system's greatest feature is the full use of cold and dry air, low power consumption, continuous operation and automated production.
The air circulation low-temperature pulverizing system is composed of a normal temperature pulverizing system, a gas source purifying system, a refrigerating pulverizing system, a packaging system, and a measurement and control system. The room temperature pulverizing system is crushed by a rolling mill or a new claw type cutting machine. After multi-stage magnetic separation, air selection and grading, the used tires are successively broken into 2 to 4 mm rubber granules.
The main function of the gas source purification system is to provide a certain pressure of the gas source, and to separate and dry the air, so that the dew point temperature is below 120 ° C to ensure no ice formation during the freezing process. The system requires air compressors, oil-water separators, dryers, and auxiliary equipment such as regeneration and cooling water circulation.
The refrigeration and milling system is the core part of the technology. The main equipment is: turbo expander. The turbo expander is the key equipment for providing a cold source, consisting of a turbine, a bearing, a compressor and a fuel supply system. The working principle is that the airflow with a certain pressure is expanded by a high wheel. The pressure energy and the internal energy are converted into mechanical power output to the coaxial compressor, and the temperature of the airflow is lowered due to the internal energy.
Industrial trial operation shows that it is feasible to produce rubber powder by air circulation low temperature pulverization. The production is stable and the operation is simple. Except for some people except for loading and packaging, all the others are realized in zen production, without waste water and exhaust gas. This device can simultaneously process the tires and wire radial tires, and expand the range of raw materials for the rubber powder.
The air circulation low-temperature pulverization method only needs to consume electricity, and the output is high, which has economies of scale. However, the liquid nitrogen low-temperature pulverization method requires a series of processes such as production, storage and transportation of liquid nitrogen, and the production is limited, and the glue obtained by the air circulation low-temperature pulverization method is obtained. The amount of fine powder in the powder is more than twice as high as that of liquid nitrogen. This indicates that the air circulation low-temperature pulverization method is a low-temperature pulverization method that is more in line with the national conditions than the low-temperature pulverization of liquid nitrogen.
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