Application scope of three effect forced circulation evaporative crystallizer:

The three effect forced circulation evaporative crystallizer is a widely used evaporator equipment in many industrial fields, mainly used for the evaporation concentration, crystallization, and solvent recovery processes of various industrial wastewater such as pharmaceutical wastewater, chemical wastewater, electroplating wastewater, papermaking wastewater, etc. It is particularly suitable for the evaporation crystallization treatment of various saline aqueous solutions, such as high salt wastewater containing sodium chloride, sodium sulfate, sodium hydroxide, sodium carbonate, etc. It is an energy-saving and efficient wastewater treatment equipment widely used in biotechnology, environmental engineering, waste liquid recovery, pharmaceutical and chemical industries, surface treatment, food and beverage enterprises, etc.

The function of the three effect forced circulation evaporative crystallizer is:

The main function of the three effect forced circulation evaporative crystallizer is to evaporate and concentrate the solution, crystallize it, and recover the solvent.

1. Evaporation and concentration: The solution is heated and evaporated to separate a large amount of solvent from the solution, increasing the concentration of the solution and reducing the total amount of solution.

2. Evaporative crystallization: After the solution is evaporated and concentrated to saturation, it continues to circulate and evaporate, causing the solute to precipitate and crystallize, and gradually growing the crystals.

3. Solvent recovery: The solvent separated by evaporation in the solution is transformed from a vapor phase to a liquid phase, and the condensate can be recycled or directly discharged, which can solve the problems of resource waste and environmental protection.

Taking the treatment of industrial wastewater as an example, the maximum evaporation and concentration of wastewater can reduce the total amount of wastewater, thereby reducing the cost of hazardous waste treatment. Crystalline products can be sold as by-products, and condensed water can be reused or discharged in compliance with standards, solving environmental problems.

Three effect forced circulation evaporation crystallizer structure composition:

The components of the three effect forced circulation evaporative crystallizer system mainly include first/second/third effect heaters, first/second/third effect evaporative crystallizers, condensers, condensate collection tanks, slurry buffer tanks, saturated mother liquor tanks, condensate pumps, forced circulation pumps, feed liquid transfer pumps, vacuum systems, electrical control systems, piping systems, equipment platforms, etc.

Working principle of three effect forced circulation evaporative crystallizer:

When the equipment is in operation, the material liquid enters the system through pumping or vacuum self-priming. The high-temperature steam from the boiler enters the shell side of the first effect heater as the heating medium. The material in the heater tube side is heated and vaporized by the shell side steam and vacuum negative pressure, and is sprayed into the first effect evaporative crystallizer for vapor-liquid separation and flash evaporation. At this time, the secondary steam with lighter specific gravity will rise through the pipeline and enter the shell side of the second effect heater, which can be used as the heat source of the second effect heater. The solution with heavier specific gravity that is not evaporated will decrease and reflux into the first effect heater, and then be sprayed again into the evaporative crystallizer, thus repeating the cycle and continuously heating and evaporating. By the same principle, the materials of the second and third effects are repeatedly heated and evaporated in their respective heaters and evaporative crystallizers. As the evaporation time increases, the concentration of the solution becomes higher and the fluidity deteriorates. The high-power forced circulation pump can ensure that the solution continues to circulate and evaporate due to heat. When the concentration of the solution reaches saturation, the solute in the solution gradually precipitates (i.e. crystallizes), and the crystals gather in the elution leg. When the crystals accumulate to a certain amount, they can be discharged from the system through the discharge pump.

The discharge state is a crystal slurry containing water, which is pumped into a centrifuge or filter press for solid-liquid separation. The separated solid crystals can be recycled, sold, or processed for other purposes. The separated saturated mother liquor can be pumped back into the system for further evaporation.

The secondary steam generated by the first effect can be used as the heating medium for the second effect, and the secondary steam of the second effect can be used as the heating medium for the third effect. The thermal energy is fully utilized, thereby saving boiler steam energy consumption and reducing equipment operating costs. The final unused secondary steam enters the condenser and is condensed into liquid under the action of external circulating cooling water. It is collected together with the steam condensate from various heaters through pipelines and collected in the condensate collection tank, and finally discharged by the condensate pump. The condensate discharged from the system can be recycled, discharged, or treated in other ways.

The three effect forced circulation evaporation crystallizer should be designed and manufactured correctly according to the characteristics of different solutions and process objectives, such as evaporation capacity, evaporation temperature, feeding form, equipment selection, etc. Please consult Hefei Xiaoniu Light Industry Machinery Co., Ltd. for details. Hefei Xiaoniu Machinery Company specializes in the design, manufacturing, and turnkey services of various evaporative concentrators, evaporative crystallizers, cooling crystallizers, and other equipment. With strong strength, rich experience, numerous cases, reliable quality, and first-class service.