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Sludge dehumidification and drying all-in-one machine
Currently, the overall situation of sludge treatment and disposal in China is mainly in the form of land utilization. A large amount of sludge still has not been properly disposed of, which will pose potential harm to the environment. The sludge in most domestic cities has not been effectively treated and disposed of. On the one hand, the sludge in most sewage treatment plants has only achieved preliminary volume reduction, not stabilization; on the other hand, the proportion of sludge that is truly safely disposed of does not exceed 20%, resulting in a large increase in pollution disputes and public reports. The proportions of different final sludge disposal methods are as follows: landfilling accounts for 60% - 65%, aerobic fermentation of sludge for agricultural use accounts for about 10% - 15%, comprehensive utilization of naturally dried sludge accounts for 4% - 6%, sludge incineration accounts for 2% - 3%, and open-air stacking and external transportation of sludge account for 15% - 20%. Among them, landfilling, open-air stacking and external transportation of sludge in most parts of China belong to random disposal.
Due to its advantages such as energy conservation, environmental protection, safety and convenience, the high-temperature heat pump dryer has an increasingly significant influence in China and has become the drying equipment in the drying industry. Material drying requires continuous operation, which is a test for high-temperature heat pump drying equipment. During the long-term use of the heat pump dryer, if it is used improperly or there is no perfect maintenance system for the high-temperature heat pump dryer during the long-term use process, its service life will be seriously affected. Users can maintain and care for the heat pump dryer through the following small tips to effectively extend the service life of the equipment.
Drying is to remove moisture, and the removal of moisture goes through two main processes:
1) Evaporation process: The moisture on the surface of the material vaporizes. Since the water vapor pressure on the material surface is lower than the partial pressure of water vapor in the medium (gas), the moisture moves from the material surface into the medium.
2) Diffusion process: It is a mass transfer process closely related to vaporization. When the moisture on the material surface is evaporated, the humidity on the material surface becomes lower than that inside the material. At this time, the driving force of heat is needed to transfer the moisture from the inside to the surface.
The continuous and alternating progress of the above two processes basically reflects the mechanism of drying.
Most drying processes take 20 - 30 minutes to dry the sludge from a solid content of 20% to 90%.
Drying is completed by two complementary and non - conflicting processes: surface water vaporization and internal water diffusion. Generally speaking, the diffusion rate of moisture decreases continuously as the dryness of the sludge particles increases, while the vaporization rate of surface moisture increases as the dryness increases. Since the diffusion rate is mainly driven by thermal energy, for the thermal convection system, dryers generally use the co - current process, and the thermal energy supply of most processes gradually decreases. This results in a decrease in the drying speed of high - dryness products in the second half. For the heat conduction system, when the surface moisture content of the sludge decreases, its heat exchange efficiency drops sharply. Therefore, a larger heat exchange surface area is required to complete the evaporation of the last stage of moisture.
The sludge drying and dehumidification all-in-one machine uses a dehumidification heat pump to dry the sludge through hot air circulation, condensation, and dehumidification. Dehumidification drying recovers the latent heat and sensible heat in the exhaust air, and the heat can be recycled in a closed loop, while the moisture is discharged through condensed water. There is no waste heat emission during the dehumidification drying process. In traditional sludge thermal drying systems, 90% of the heat supply is converted into exhaust heat loss (latent heat of water vapor and sensible heat of hot air). There is also no exhaust gas emission, so there is no need for exhaust gas deodorization and dust treatment devices, and the system is simple and optimized.
A dehumidification heat pump is a device that uses a refrigeration system to cool and dehumidify humid air and at the same time recovers the latent heat of moisture condensation in the air through the heat pump principle to heat the air. Dehumidification heat pump drying uses a refrigeration system to cool and dehumidify the humid air from the drying chamber and at the same time recovers the latent heat of moisture condensation through the heat pump principle to heat the air to achieve the purpose of drying the materials. A dehumidification heat pump combines dehumidification (drying) and heat pump (energy recovery), which enables energy recycling during the drying process.
Shandong Fuhang New Energy & Environmental Protection Co., Ltd. is located in the High-tech Industrial Development Zone of Yucheng City, Shandong Province. It is a listed company on the New Third Board with the equity number: 831714. It is a high-tech enterprise, a director unit of the Shandong Environmental Protection Industry Association, and a vice-chairman unit of the Shandong Agricultural and Animal Husbandry Circular Industry Alliance. It mainly researches and manufactures new energy sludge treatment equipment, intelligent high-temperature aerobic fermentation equipment,Sludge drying all-in-one machine, biomass fuel equipment, solid waste treatment equipment, etc.
The company's sludge and livestock manure and other organic waste treatment technologies have obtained more than 60 national patents, and have passed the scientific and technological achievement appraisal of the Shandong Provincial Department of Science and Technology and the new product and new achievement appraisal of the Shandong Provincial Economic and Information Commission. It is at the leading level in China and has been successfully included in the "Catalogue of Advanced Technological Achievements for Science and Technology to Benefit the People" of the Ministry of Science and Technology of the People's Republic of China. The company has established a "Postdoctoral Innovation Practice Base" of Shandong University and a "Shandong Provincial Engineering Technology Research Center for Energy-saving Sludge Treatment Equipment" approved by the Shandong Provincial Department of Science and Technology. It has also established R & D cooperation partnerships with many universities such as Shandong University and Huazhong Agricultural University, which has greatly improved the technological level of products. The company has the "Grade 3 Qualification for Professional Contracting of Environmental Protection Projects", the "Grade 2 Qualification for Operation of Organic Waste Treatment and Disposal Facilities" and the "Grade 2 Qualification for Operation of Industrial Solid Waste Harmless Treatment Facilities". It has built nearly 300 solid waste treatment projects in total, and its business covers six major industries including municipal, papermaking, chemical, metallurgy, printing and dyeing, and biology.
Shandong Fuhang New Energy & Environmental Protection Co., Ltd. will take the responsibility of researching and developing the most practical environmental protection equipment and make unremitting efforts to create a healthy, harmonious, environmentally friendly and hygienic living environment.
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