Chemical sludge is a kind of by-product containing a large amount of solid waste produced in the process of chemical production. Due to the fact that chemical production involves a variety of raw materials and processes, the composition of chemical sludge is complex and varied, and the composition of sludge between different chemical enterprises and different production batches may differ due to the change of raw materials, process adjustments, etc., which brings a great challenge to the treatment and disposal of sludge. Chemical sludge containing heavy metals, toxic organics and other harmful substances is toxic and hazardous. Heavy metal ions may accumulate in the environment and enter the human body through the food chain, causing damage to the human body's nervous system, liver, kidneys and other organs. Toxic organic compounds may have the “three causes” of carcinogenicity, teratogenicity and mutagenicity. In the context of increasing public awareness of environmental protection, chemical companies are increasingly focusing on their social image and corporate social responsibility. Actively adopting environmental protection measures such as sludge drying and effective treatment of sludge can help enhance the social recognition and brand image of enterprises and strengthen their advantages in market competition.
With the increasing awareness of environmental protection and the continuous strengthening of related policies, chemical enterprises are facing stricter requirements for sludge treatment. The government has set detailed standards and specifications for sludge discharge, disposal and resource utilization, etc. In order to meet the compliance requirements, chemical enterprises need to adopt efficient sludge drying equipment, such as paddle dryer, to dry sludge to reduce the volume and harmful substance content of sludge and reduce the risk of pollution to the environment. Chemical sludge drying paddle dryer adopts indirect heating method with high thermal efficiency, which can realize rapid drying of sludge with low energy consumption. Compared with traditional drying equipment, it can greatly reduce energy consumption and operating costs, which is more attractive to chemical enterprises, especially in the context of rising energy prices, energy-saving paddle dryer is more favored by the market.
Chemical sludge drying paddle dryer working principle
(1) Heating mechanism: paddle dryer is mainly heated by heat conduction. The hollow shaft is densely arranged with wedge-type hollow paddles, and the hot medium, such as steam, hot water or heat-conducting oil, flows into the paddles through the hollow shaft. The temperature range of the hot medium is from -40℃ to 320℃, which can be selected according to different drying requirements. This indirect heating method, there is no large amount of carrying air to take away the heat, heat loss is only through the body of the thermal insulation layer to the environment of the heat dissipation, thus greatly improving the heat utilization rate, energy-saving effect is remarkable.
(2) Material drying: the dried chemical sludge is continuously fed into the feeding port of the dryer by the screw feeder in a quantitative manner, and after entering the dryer, under the rotating action of the paddles, the sludge is constantly turned and stirred, and it is fully contacted with the body and the paddles, so as to make the surface moisture contained in the sludge evaporate. At the same time, the sludge with the rotation of the paddle shaft into a spiral trajectory to the direction of the discharge port, continue to stir in the process of transportation, so that the moisture exuded from the sludge can continue to evaporate, and ultimately dry and uniformly qualified products discharged from the discharge port.
(3) Strengthen the drying effect: special paddle structure, paddle design for the wedge-type hollow paddle, this structure makes the unit effective volume within the heat transfer area is very large, can effectively improve the drying efficiency. And the wedge-type paddle has a special compression-expansion stirring effect on the material during the mixing process, so that the material particles are fully in contact with the heat transfer surface, and the gradient of temperature, humidity and mixing degree of the material is very small in the axial interval, thus ensuring the stability of the process and the consistency and stability of the drying effect of the chemical sludge.
(4) Self-cleaning function: In the process of operation, the relative movement of material particles and wedge-shaped paddle surface produces scrubbing effect, which can scrub off the material adhering to the wedge-shaped surface, so that the operation has been to maintain a clean heat transfer surface, which reduces the maintenance workload of the equipment, and also contributes to the continuous and effective transmission of heat, which further strengthens the drying effect.
Chemical sludge drying paddle dryer performance advantages
(1)Energy-saving and high efficiency: due to indirect heating, there is no large amount of carrying air to take away the heat, and the outer wall of the dryer is set with heat preservation layer, for slurry materials, evaporation of 1kg of water only requires 1.3kg of water vapor, compared with the traditional drying equipment, the energy consumption is greatly reduced.
(2)Wide range of processing materials: the use of different heat media, both to deal with heat-sensitive materials, but also to deal with high-temperature treatment of materials, commonly used media are steam, thermal oil, hot water, cooling water, etc., and can be operated both continuously and intermittently, can be applied in many fields, the chemical sludge such as the composition of the complexity of the nature of the diverse materials adaptability.
(3) small environmental pollution: not use the carrying air, dust material entrainment is very small, the material solvent evaporation is also very small, easy to deal with. For polluted materials or need to recover solvent conditions, can be used closed loop, can effectively reduce the pollution of the environment, in line with environmental requirements.
(4) low operating costs: the normal operation of the equipment only 1 hour / day - people, low-speed mixing and reasonable structure makes the equipment wear and tear is small, the maintenance costs are very low, reducing the operating costs of enterprises.
(5) Stable operation: the special compression-expansion stirring effect of the wedge-type paddle makes the material particles fully contact with the heat transfer surface, and the gradient of temperature, humidity and mixing degree of the material is very small in the axial interval, thus ensuring the stability of the process and the consistency and stability of the drying effect of chemical sludge.
(6) Self-cleaning function: paddles in the process of mixing materials, material particles and wedge-shaped surface of the relative movement of the scrubbing effect, can scrub off the wedge-shaped surface of the adhering materials, so that the operation of the operation has been to maintain a clean heat transfer surface, reducing the maintenance workload of the equipment.
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