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Use low-energy drying technology to reduce the greenhouse effect caused by energy consumption. According to calculations, the global energy consumption in 1990 was 3.09×1020J, of which 1.36×1020J was industrial energy consumption, and 20% of industrial energy consumption was for dry operation. Since almost all of the dry energy is generated by the combustion of minerals, this leads to a continuous increase in the concentration of CO2 in the atmosphere, which exacerbates the greenhouse effect of the earth. We can use new drying technology to reduce energy consumption by improving old drying technology. New technologies such as impact spray drying, impact drying, and superheated steam drying, which are applied in paper drying, will significantly reduce the energy consumption for drying. In particular, superheated steam drying is a technology that can reduce energy consumption from multiple angles. Through steam cycle, the unit heat consumption of 1 kg of water evaporated can be lower than 2.5×106J (typical air drying can achieve a unit heat consumption of up to 2 .5 × 106 ~ 8 × 106 J), such as the use of segmented combination drying technology, rational use of other processes of cold and hot steam in the drying process, will further reduce energy consumption. In addition, the application of many non-thermal drying technologies, such as replacement drying, osmotic drying, electro-osmotic drying, contact absorption drying, etc., is also an effective method to reduce energy consumption.
Develop large-scale biomass fuel drying technology. When fossil fuels are released from fossil fuels released millions of years ago, they produce CO2, exacerbating the greenhouse effect. The application of biomass-derived renewable energy, biofuels, will only release recycled CO2 without producing a greenhouse effect. It is an alternative energy source that is conducive to sustainable development. Biomass fuels include peat, bark, wood, straw, bagasse, peel, gluten, etc. Many of them do not burn without being dried. Even those biomass fuels that can be burned without drying will improve their combustion efficiency after drying. The difficulty of biomass fuel drying technology is the development of large-scale dryers. The usual requirement is to evaporate dozens of tons of water per hour. High-yield, low-cost drying technology is the key to drying biomass fuels.
The use of solar energy. The direct use of solar energy for drying operations is actually one of the oldest drying methods. Today, we use advanced technologies such as solar tents, solar dryers, etc. to replace ancient open air drying. It has been found that the quality of solar drying products is superior to that of other industrial drying technologies. For example, the quality of solar-dried coffee is significantly higher than that of spray-dried products. Solar drying technology is most expected to be the first to develop in the sunny western region. The basic requirements for dryers are simple, cheap and reliable.
In addition, the use of drying technology to improve product quality, recycle or dispose of industrial process wastes, and prevent waste of resources are all aspects of the sustainable development of dry technologies.
There are many factors that are not conducive to the sustainable development of dry technologies, such as air pollution and noise pollution. Advantageous aspects include promoting the use of biomass as a renewable energy source, reducing the impact of crop corruption on the environment, and improving global energy balance. Therefore, sustainable development of drying technology can only be promoted by seeking benefits and avoiding harm.