The circulating liquid treatment system of the spray tower is the core to maintain the stable operation of the equipment. Its purification, regulation and recycling of the circulating liquid are directly related to the treatment efficiency and service life of the spray tower.
The spray tower realizes the functions of exhaust gas purification and material drying through gas-liquid contact, and the circulating liquid is used repeatedly in it. If improperly handled, the circulating liquid will cause nozzle blockage, scaling in the tower, equipment corrosion, etc. due to problems such as accumulation of pollutants and imbalance of components, which will affect the normal operation of the spray tower. Therefore, a perfect circulating liquid treatment system is the key to ensure the long-term stable operation of the spray tower.
During the operation of the spray tower, the circulating liquid will continuously absorb suspended matter such as particulate matter and impurities in the exhaust gas. If these suspended matter are not separated in time, it is very easy to cause nozzle blockage, reduce the atomization effect, and affect the gas-liquid mass transfer efficiency. The circulating liquid treatment system is usually equipped with a multi-stage filtration device, such as a mechanical grid that can intercept large particle impurities to prevent them from entering the subsequent treatment process; bag filters and filter element filters can further remove fine particles to ensure the cleanliness of the circulating liquid. In addition, some systems will also use cyclone separators to use centrifugal force to separate particles with higher density from the circulating fluid, ensure the smooth transportation of the circulating fluid, and reduce equipment failures caused by blockage.
In applications such as waste gas treatment, the pH value of the circulating fluid directly affects the progress of chemical reactions. For example, in the desulfurization process, after the alkaline circulating fluid absorbs sulfur dioxide, the pH value will gradually decrease. If it is not adjusted in time, the desulfurization efficiency will be weakened. The circulating fluid treatment system uses an online pH monitor to detect the pH of the solution in real time. When the pH value deviates from the set range, alkaline agents (such as lime milk, sodium hydroxide solution) or acidic agents are automatically added for adjustment. At the same time, in order to ensure the uniformity and effectiveness of pH adjustment, the system will also be equipped with a stirring device to fully mix the agent with the circulating fluid, ensure that the circulating fluid is always in the best reaction state, and ensure the purification effect of the spray tower.
Heavy metals (such as mercury, lead, cadmium) and other harmful substances in industrial waste gas will dissolve in the circulating fluid, which will not only pollute the environment, but also corrode the metal parts of the spray tower. The circulating liquid treatment system uses chemical precipitation, ion exchange, adsorption and other technologies to remove these harmful substances. For example, by adding precipitants such as sodium sulfide, heavy metal ions are generated into insoluble sulfide precipitates, which are then removed by solid-liquid separation equipment; ion exchange resins are used to adsorb specific metal ions to reduce their concentration in the circulating liquid. By effectively removing harmful substances, the service life of the spray tower equipment can be extended and the maintenance and replacement costs caused by corrosion can be reduced.
As the circulating liquid continues to evaporate and use, the salt in it (such as sulfate generated during the desulfurization process) will gradually accumulate. High concentrations of salt will increase the viscosity of the solution, affect the fluidity of the circulating liquid, and may also crystallize in the tower and pipeline, causing blockage. The circulating liquid treatment system treats salt through processes such as evaporation, concentration, and crystallization. A common method is to use an evaporation crystallizer to heat and evaporate the circulating liquid to crystallize the salt, and then separate the crystals through centrifugal separation or filtration equipment to obtain a relatively pure circulating liquid for continued reuse. This treatment method can not only reduce the impact of salt on the equipment, but also realize the recycling of water resources and reduce operating costs.
To ensure the efficient operation of the circulating liquid treatment system, modern spray towers are usually equipped with intelligent monitoring and control systems. The system monitors the flow, temperature, concentration, pH value and other parameters of the circulating liquid in real time through sensors, and transmits the data to the central control system. Once an abnormality is detected, the system will automatically alarm and adjust the dosage, filtration frequency, equipment start and stop and other operations according to the preset program. In addition, the intelligent system can also analyze and predict the operating status of the equipment, discover potential faults in advance, arrange maintenance plans, avoid equipment downtime due to sudden faults, and realize intelligent and precise management of the circulating liquid treatment system.
The circulating liquid treatment system of the spray tower effectively solves the problems of blockage, corrosion, and imbalance of components faced during the use of the circulating liquid through the coordinated operation of multiple links such as suspended matter separation, pH value adjustment, harmful substance removal, concentrated crystallization treatment, and intelligent monitoring and control, ensuring the long-term stable operation of the equipment. With the improvement of environmental protection requirements and the development of industrial technology, the circulating liquid treatment system will continue to innovate and optimize to provide more reliable support for the efficient operation of the spray tower.
