Traditional cooling methods for industrial circulating water A large amount of heat is produced in the production process of industrial field, which needs to be cooled by circulating water cooling system. The traditional cooling method is open circle water cooling tower.
Problems with traditional cooling methods · High water consumption(1.5%~1.8% of circulating water), serious waste of water resources, not in compliance with environmental policy; · High operating water consumption and sewage treatment cost, poor economy; · Winter operation produces a large number of white fog, become the carrier of haze, and ‘culprit’ of the Haze; · Winter white fog forms snow, frost microclimate, resulting in safety risks.
With the tightening of environmental protection policies, traditional circulating water cooling methods will be replaced. Shuangliang's energy-saving, water-saving and mist-eliminating industrial circulating water system aims to achieve the dual benefits of environmental protection and economy.
1.Hybrid Cooling Tower
Structure
Combination of the air cooling radiator (finned tube) and evaporative cooling coil (smooth tube) in one cooling tower with novel structure design The heat dissipation of the dry cooling section is vertically arranged outside the tower, and the evaporative cooling coil section is horizontally arranged inside the tower. Both sections work in series at water side and in parallel at wind side.
Function
· Water saving hybrid cooling tower operates in seasonal cycle with two main modes: Winter mode and Summer mode. In summer, the main operating condition is to meet the cooling water temperature by opening the wet cooling section air louver and closing the dry cooling section air louver to increase the wind speed through the wet cooling section, give full play to the cooling capacity of evaporative cooling in summer and meet the water temperature requirements. In winter, the main operating condition is mist-elimination and water saving by turning down the wet cooling section air louver and turning up the dry cooling section air louver to increase the wind speed through the dry cooling section, give full play to the dry cooling capacity, and achieve the maximum water saving. What about in Spring and Autumn? It will be an inter-state between Summer and Winter mode, i.e., the air louver openness of both sections are well manipulated by PLC or DCS automation system to guarantee the designed cooling water temperature, and saving water as much as possible at the same time.
· Plume abatement The circulating water enters the tube bundle in the dry cooling section for cooling and then enters the wet cooling section for cooling. The high-temperature and high humidity air (state point C) generated by evaporative cooling in the wet section is mixed with the heated dry and hot air in the dry section to reduce the moisture content. It is discharged after reaching state B. the mixing line (BA line) does not intersect with the saturation line to realize mist elimination. This technical route can eliminate fog all year round.
Main Features
01/ Combined air cooling and evaporative cooling technology Air cooling and water cooling are integrated, and the switching and joint operation of air cooling and water cooling are used to ensure the stability of outlet water temperature and achieve the effect of water saving and mist elimination. The economic benefits of water saving are considerable and the benefits of environmental protection are obvious.
02/ L-type dry and wet combined system The air cooling and water cooling adopt the L type layout of the invention patent: the air cooling section is arranged vertically outside the tower, and the water cooling section is arranged horizontally inside the tower. The circulating water is cooled by the air cooling section first, and then by the water cooling section. The whole process is in the L type.
03/ Low thermal resistance and high heat transfer coefficient The heat transfer surface of the fin of the air-cooled tube bundle is slotted to strengthen the turbulence, and the heat transfer coefficient is high. The fin is closely combined with the base tube after expansion, and the thermal resistance is low. For long-term operation, because the spring effect is still tight, the heat exchange efficiency decays slowly.
04/ Optimized pipeline process design The double-flow counter cross flow can make the heat-transfer coefficient higher.
05/ Low wind resistance and low power consumption The fins between each row of air cooling tube bundle are continuous, and the wind resistance of air-cooled tube bundle is low. The air cooling tube bundle is vertically arranged outside the tower, the air cooling section and water cooling section are connected in parallel on the wind side, and the system wind resistance is low. Compared with other water-saving demisting towers, the fan power consumption is about 30% lower.
06/ High water saving rate The air cooling tube bundle is arranged on both sides outside the tower, which can be expanded by increasing the quantity of fans in single tower and the area of air cooling tube bundle, so as to give full play to the role of air cooling tube bundle and reduce water evaporation, and achieve a water-saving rate of 85% at most.
07/ Fog elimination throughout the year The dry hot air passing through the air cooling tube bundle is mixed with the saturated wet air of the water cooling tube bundle to reduce its moisture content, and there will be no fog when entering the atmosphere, so as to ensure the fog elimination throughout the year.
08/ Intelligent automatic control technology The opening and closing of shutters of air cooling tube bundle and water cooling tube bundle, the frequency variation of fan motor and the start and stop of spray water pump can be adjusted automatically according to the inlet and outlet water temperature and ambient temperature. Client can choose to access the “Shuangliang cloud platform” developed by Shuangliang according to the characteristics of this product to upload the data to the cloud, which can realize the functions of remote Internet real-time monitoring, WeChat receipt of fault information, cloud data backup, big data analysis, predictive maintenance, equipment health analysis, etc.
