High-salt wastewater is defined as wastewater containing at least 3.5% total salt content, mostly from petrochemical, coal chemical, pharmaceutical, iron and steel, and printing and dyeing industries, which use a large amount of water in the production process and also produce a large amount of high-salt wastewater. For example, the petrochemical industry generates wastewater containing high concentrations of inorganic salts and organic pollutants during the refining of crude oil and the production of petrochemical products. The direct discharge of highly saline wastewater will lead to an increase in salinity of the receiving water bodies, which will affect the survival of aquatic organisms.
high, affecting the survival and reproduction of aquatic organisms. For example, it will cause an imbalance in the osmotic pressure of freshwater organisms, resulting in their growth being impeded, their reproduction capacity being reduced or even their deaths, and thus disrupting the ecological balance of the water body. Used for irrigation will salinize the soil, leading to the destruction of soil structure and decrease in fertility, affecting the growth and yield of crops. High-salt wastewater will inhibit the activity of microorganisms, affecting the performance and efficiency of the biological treatment system and leading to poor wastewater treatment. Example
For example, the growth of activated sludge is inhibited, the settling performance of sludge becomes poor, and the effluent water quality is difficult to meet the standard.
The chemical production process will produce a large number of high-salt wastewater, such as agrochemical, pharmaceutical and chemical fields. These high-salt wastewaters contain high salinity, high COD, tar, sticky wall and other substances, and are difficult to treat. Traditional technologies such as multi-effect evaporation and MVR have problems such as reduced energy efficiency and clogging of heat exchangers when treating mother liquors, while the drum scraper dryer can effectively solve these problems by drying the mother liquors of high-salt wastewater into solids, which is convenient for subsequent treatment and transportation, and thus the demand in the chemical industry is increasing. With the increasingly strict environmental protection requirements, the treatment and discharge requirements for high salt wastewater are also increasingly high. As an efficient wastewater treatment equipment, high salt wastewater drum scraper dryer can convert high salt wastewater into solid waste, reduce the discharge of wastewater, reduce the pollution of the environment, and meet the requirements of environmental protection policies, so the market demand in the field of environmental protection is gradually expanding.
High salt wastewater drum scraper dryer structure composition
High salt wastewater drum scraper dryer is a kind of rotating continuous drying equipment with internal heat conduction. The rotating drum adheres to a certain thickness of material film through the lower material groove, and the heat is transported to the inner wall of the drum through the pipeline, conducted to the outer wall of the drum, and then conducted to the material film, so that the humidity in the material film can be evaporated and dehumidified, thus drying the high salt wastewater containing humidity. The dried material is shoveled away from the drum by the scraper installed on the surface of the drum, and falls to the screw conveyor placed under the scraper, and then the dry material is concentrated and packed through the screw conveyor.
(1) Drum: It is the core component of the dryer, generally hollow cylinder structure, made of metal materials, with good thermal conductivity. The diameter, length, wall thickness and other parameters of the drum are designed according to the processing capacity and process requirements, and its surface is treated with special treatment, such as hard chrome plating, etc., to improve the hardness, abrasion resistance and corrosion resistance.
(2) Scraper device: it consists of bracket, scraper blade fixture, scraper blade, pressure relief device, bearing and swinging device. The material of scraper blade matches with the surface material of the cylinder, and its installation angle and contact tightness with the cylinder have an important influence on the drying effect and equipment operation stability. The oscillating scraper device can prevent the accumulation of dirt and ensure the cleanliness of the scraper and cylinder surface.
(3) Feeding and fabrication system: it is composed of feeding pump, material liquid tank, overflow pipe and related valve group and other devices. After the raw material liquid is processed by filtration and other pre-processes, it is transported to the material liquid tank through the material supply pump. The trough is designed at the bottom of the drum, and its special butterfly structure can match the immersion depth of the cylinder to ensure the formation of a uniform thickness of liquid film when the cylinder is rotating. The material liquid tank is equipped with an overflow pipe to prevent the material liquid from overflowing, and at the same time, according to the drying requirements of the material in the tank set the coil to heat or cool the material liquid in order to ensure the concentration and viscosity of the material liquid.
(4) Heat conduction oil system: it is composed of rotary joint, metal hose and related valve group and other devices. The rotary joint is a rotating mechanical sealing device used to transport and exclude heat transfer media, such as steam, water, heat transfer oil, coolant, etc., between the fixed pipeline and the rotating drum. The whole metal hose is made of stainless steel, which has strong corrosion resistance and good flexibility and bending strength.
(5) Exhaust system: due to the evaporation of more water, need to be equipped with a forced moisture exhaust system, supporting the exhaust hood above the drum, using a fan to force the moisture out of the outdoors to ensure that the indoor operating environment.
(6) Control system: centralized control, transmission motor frequency conversion speed control cylinder speed, can realize the drying process of fine que control and monitoring, improve production efficiency and product quality stability.
High salt wastewater drum scraper dryer performance advantages
(1)High-efficiency drying capacity
Large drying rate: the material film is very thin, generally in 0.3~1.5mm, and heat transfer, mass transfer direction is consistent, the material film surface can maintain 20~70kg.H2O/m2.h evaporation intensity, can quickly remove the water evaporation of high salt wastewater, greatly improving the drying efficiency.
Short drying time: the drying cycle of the material is usually only 10~300 seconds, especially suitable for the drying of heat-sensitive materials. For high salt wastewater treatment, shorter drying time means that the treatment process can be completed in a shorter time, improving production efficiency.
(2)Good operation performance
Great operation flexibility: it can adapt to different material characteristics and output requirements by adjusting many drying factors such as concentration of feed material, thickness of coating film, temperature of heating medium, rotation speed of drum, etc., and these factors are independent of each other and not involved, which brings great flexibility to the operation.
High operational stability: the drum is made of high-quality metal material with good strength and rigidity, able to withstand the corrosion and abrasion of high salt wastewater. At the same time, its structure is reasonably designed, low vibration and low noise during operation, which ensures the long-term stable operation of the equipment.
Simple maintenance: the structure of the equipment is relatively simple, the main components such as drum, scraper, etc. are easy to disassemble and replace, and the daily maintenance workload is small. Moreover, the key components are made of wear-resistant and corrosion-resistant materials with long service life, which reduces the maintenance cost and downtime of the equipment.
(3)Excellent energy-saving effect: high thermal efficiency, its heat transfer mechanism is heat conduction, the direction of heat transfer in the entire operating cycle to maintain the same, in addition to the cover heat dissipation and heat radiation loss, the rest of the heat is all used in the cylinder wall of the material film moisture evaporation, the thermal efficiency of up to 70% to 90%, compared with other drying methods, can effectively reduce energy consumption and save production costs.
(4)Reliable material processing
Wide material adaptability: not only suitable for drying high-salt wastewater, but also can be widely used in chemical, dyestuff, pharmaceutical, food, metallurgy, yeast and other industries of liquid or viscous material drying, able to deal with a variety of different nature and composition of the material
Good product quality: during the drying process, the material forms a uniform film on the surface of the drum, which is heated evenly, ensuring stable product quality after drying and good salt crystallization, which is conducive to the subsequent recovery and processing. At the same time, the scraper device can completely scrape the dried material away from the drum, avoiding the material remaining on the surface of the drum and agglomeration.
(5)Advanced control system: Adopting automatic control system, it can realize precise que control and monitoring of the drying process, such as real-time display and automatic adjustment of temperature, pressure, rotating speed and other parameters, which improves the intelligent level of the production process and the stability of the product quality, reduces the manual intervention, and lowers the labor intensity and the rate of operation error.
(6) Good environmental performance: in the drying process, the water vapor and exhaust gas generated can be treated by the supporting exhaust system, reducing the pollution of the environment. In addition, due to the high drying efficiency, it can reduce the cost of high salt wastewater treatment and the impact on the environment, in line with the requirements of environmental protection.
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