Multiple-effect distillation device and method for desalting sea water or brackish water only by using solar
A multi-effect distillation and brackish water technology, which is applied in chemical instruments and methods, seawater treatment, water/sewage treatment, etc., can solve the problems of easy blockage of spraying devices, long process, and large power consumption, so as to avoid heat transfer Tube fouling, simple process and equipment, and the effect of saving power resources
Inactive Publication Date: 2010-09-22
TIANJIN UNIV
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Problems solved by technology
Solar power generation-membrane seawater or brackish water desalination system, the device is complicated, seawater or brackish water needs strict pretreatment, and the process is long
The desalination system that combines solar collectors with traditional seawater or brackish water desalination technology requires the installation of complex liquid spraying devices, and the spraying devices are easy to block, and uneven spraying can easily cause fouling of the heat transfer tubes, which affects the performance of the equipment. normal operation
Existing seawater or brackish water desalination systems that use solar energy to generate heat to drive seawater or brackish water to undergo a phase change under a certain degree of vacuum need to be equipped with vacuum pumps or jet pumps when vacuuming, which still consumes a lot of electric energy, resulting in unit The water production rate of energy consumption is small, which limits the promotion of solar seawater or brackish water desalination technology
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[0014] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings: figure 1 It is a schematic diagram of the device structure of the multi-effect distillation method for desalinating seawater or brackish water by using solar energy in the present invention (take a 4-effect evaporator as an example). The solar collector 1 is a flat plate type, the model is PGT / L2.0-J, the collecting area is 1m 2 The maximum temperature of the heat exchange medium of the solar collector can reach 80-83℃, and the overall dimensions of each effect evaporator and condenser are: 4000mm×600mm×11000mm.
[0015] The process of seawater desalination with the above device is as follows: fill the evaporator with seawater through the seawater inlet pipe 4 and the seawater inlet valve 5, fill the evaporator with non-condensable gas, close the seawater inlet valve, and open the evaporator with each effect The regulating valve 10 on t...
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The invention discloses a multi-effect distillation device only by using solar energy to desalt sea water or brackish water and the method. The device comprises three parts: a solar energy collector, a multi-effect evaporator and a condenser. The method of the device for desalting the sea water or the brackish water comprises the processes: vacuum of each effect evaporator is regulated; steam generated in each effect evaporator sequentially enters a condensation heat exchange tube in a next effect evaporator through a steam outlet of the effect evaporator; after the condensation, the fresh water is obtained, and energy for vaporizing the sea water or brackish water in the effect evaporator is provided. The invention has the advantages of simple desalting process and device as well as reliable operation and running and no consumption of other energy except that the solar energy supplies heat, which is particularly applied to areas short of the fresh water but rich in the sea water, brackish water and the solar energy.
Description
Technical field [0001] The invention relates to a multi-effect distillation device and method for desalinating seawater or brackish water by single use of solar energy, belonging to the desalination technology of water treatment. Background technique [0002] Seawater or brackish water desalination technology is a process in which salinity in seawater is removed through devices or equipment and fresh water is obtained. [0003] The methods of seawater or brackish water desalination are mainly divided into distillation method and membrane method. Seawater or brackish water desalination by distillation is a process in which seawater or brackish water is heated to evaporate, and then the steam is condensed to obtain fresh water. Membrane seawater or brackish water desalination technology refers to the use of natural or synthetic polymer membranes, using external energy or chemical potential as the driving force to separate salt and water in seawater or brackish water. [0004] Solar s...
Claims
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IPC IPC(8): C02F1/14C02F103/08
CPCY02A20/124Y02A20/142Y02A20/212
Inventor 解利昕张勇王世昌李凭力
Owner TIANJIN UNIV