A new type of solar decompression multi-effect membrane distillation device
A multi-effect membrane distillation, solar energy technology, applied in the direction of membrane, pervaporation, membrane technology, etc., can solve the problems of high energy consumption and operating costs, and the solar decompression multi-effect membrane has not been applied, so as to improve the thermal energy utilization efficiency and prolong the The effect of continuous and stable operation time and reduction of construction costs
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Embodiment example 1
[0067] Most areas in my country belong to category 3 and above sunshine areas (areas where solar energy can be utilized), and the annual sunshine hours are more than 2,000 hours. Therefore, the Venturi-solar decompression multi-effect membrane distillation system has broad application prospects, especially in areas where fresh water resources are scarce but brackish water is abundant, and the system can be used to prepare drinking water and domestic water.
[0068]In a city in my country's Type 3 sunshine area, under typical sunny weather conditions in summer. The intensity of solar radiation gradually increases from 8:00 a.m. to the strongest between 12:00 and 14:00 noon, and then gradually weakens. The average total irradiance exceeds 900W·m 2 , the total daily solar radiation can reach 20MJ m 2 d -1 . At this time, the daily average efficiency and instantaneous efficiency of the vacuum tube collector are roughly 45% and 70%, respectively. The outdoor ambient temperature...
Embodiment example 2
[0078] In a city in the third type of sunshine area in my country, under the typical cloudy weather in summer. The solar radiation intensity is very low, and the total daily solar radiation is less than 8MJ m 2 d -1 . The outdoor ambient temperature is between 30-34°C.
[0079] The temperature in the water storage tank 35 and the hot water tank 13 changes with the intensity of solar radiation, and the temperature range is between 50-60°C. The use concentration is 35g·L -1 The NaCl salt solution is used as the raw material solution, and the flow rate is controlled by a rotameter to 120L h -1 , the hot water flow in the hot water tank 13 is 600L·h -1 , the temperature of the raw material liquid before entering the evaporation zone 8 is 54°C, and the flow rate of the cold water in the Venturi tube system (cold side) is controlled at 360L h -1 , the pressure generated at the water vapor inlet 51 is 10kPa, and the maximum membrane flux obtained by continuous operation for 6 h...
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