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The sludge discharged from the sewage treatment plant has a water content of up to 90%, and the moisture content of the filter-filtered sludge is still high, which is not convenient for transportation. The heat pump drying treatment can reduce the moisture content of the sludge to 20-30%, facilitating efficient incineration. . Although the initial investment in heat pump sludge drying is slightly higher, it is energy-saving and environmentally friendly, and is recognized as a green drying technology. Some drying methods such as drum type, rotary type, belt type, spiral type, centrifugal type, fluidized bed and paddle type, the air is an open cycle, and it is necessary to periodically discharge a certain amount of humid air from the drying chamber and inhale the same amount. The cold air has a large loss of exhaust heat. So how does the sludge dryer based on heat pump technology save energy?
The energy-saving principle of the heat pump sludge dryer is that when the equipment is dry and running, the air in the drying room is closed cycle. When the predetermined temperature is reached in the sludge drying room, the heat pump intelligent temperature and humidity control system is started, and the sludge is evaporated. The moisture increases the humidity of the air in the drying box, and the humid air flows through the evaporator of the heat pump to cool down and discharge the condensed water. The refrigerating medium releases the heat energy of the humid air that it previously absorbed in the evaporator at the condenser, heats the dehumidified air, and the hot air flowing out of the condenser returns to the heat pump sludge drying room to continue to dry the sludge, so The rate is high and the heat loss is low.
In the form of a heat pump sludge dryer in the form of a drying room, the drying time of each batch of sludge is more than 10 hours, so that the sludge has a moisture content of more than 90% and is reduced to 20-30% or less. The material does not move, but the hot air is rotated 360°, so that the heat flows evenly in the drying room, and at the same time, the water is taken away and condensed into water to drain away. In the form of a heat pump sludge dryer in the form of a line, the stroke of the sludge from the feed port to the discharge port is determined by the required dryness, and the travel speed of the line can be adjusted, usually in about 2 hours. The heat generated by the heat pump heats the sludge from bottom to top through the fan unit. The working temperature of the equipment is generally about 60-70 degrees, which is a low-temperature sludge drying technology. Therefore, there is no need for a separate deodorizing device for the sludge. The condensate produced by the condensing and dehumidifying device of the dryer can be directly discharged or can be returned to the sedimentation tank for repeated use.
Since the sludge does not need to worry that the drying rate will affect the phase too quickly, the sludge drying rate increases with the increase of temperature, and the lower the relative humidity, the faster the drying rate, and the sludge heat pump drying rate condenses with the working fluid. The temperature is increased and accelerated. After repeated tests, the average energy recovery rate of energy-saving data is 23.6%-48.8%, with an average of 39.25%. The application of heat pump sludge drying and drying technology is expanding with the scale of industrial production, which is the paper mill sludge. , pharmaceutical sludge, printing and dyeing plant tannery sludge, lighting factory hazardous waste sludge, hardware factory, circuit plant heavy metal sludge, food processing sludge, pesticide chemical plant sludge, etc. provide solutions and technical support, as a New and energy-saving new technologies have largely solved the problems of traditional drying efficiency and high drying energy consumption.
How is the sludge dryer based on heat pump technology energy efficient?
If the untreated sludge is placed in the environment, it will directly cause secondary pollution to the water body and the atmosphere, which will pose a serious threat to the ecological environment and human activities. With the sewage treatment rate increasing year by year, the sludge production is increasing sharply, and China is paying more and more attention to wastewater treatment. At present, sludge disposal methods are mainly landfill, composting and incineration. The sludge landfill land resource is wasteful, and the transportation process and the leachate in the landfill are easy to cause secondary pollution to the environment. When the sludge is used for composting or compound microbial fertilizer, if it is heavy metal sludge, the metal content is Exceeding national standards will endanger crop growth. The first two types of sludge that cannot be treated are generally incinerated. The dried sludge can produce 16.65-20.93 MJ/t of heat energy, which is a low calorific value fuel, and the incineration ash does not cause secondary pollution. Especially for hazardous waste sludge, heavy metal sludge, industrial sludge, pharmaceutical sludge, chemical sludge and other sludge drying after incineration, it is the most effective way for sludge to be harmless and reduced.