Low-position heat energy spray evaporation-multiple-effect distillation seawater desalination method and device

A technology of spray evaporation and multi-effect distillation, which is applied in chemical instruments and methods, seawater treatment, heating water/sewage treatment, etc., can solve the problems of popularization restrictions, achieve wide application prospects, increase fresh water production, and reduce costs

Inactive Publication Date: 2008-01-30
OCEAN UNIV OF CHINA
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  • Summary
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Problems solved by technology

However, in the spray evaporation desalination process, in order to produce fresh water, a large amount of cooling water is required in the cooling process of the hot gas stream containing water vapor. The amount of cooling water required to produce 1 kg of fresh water ranges from about 7 kg to more than 20 kg. The promotion of this technology therefore subject to certain restrictions

Method used

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  • Low-position heat energy spray evaporation-multiple-effect distillation seawater desalination method and device

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Experimental program
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Effect test

Embodiment 1

[0039] a) The air is transported by the fan 11 to the heater 12, and enters the spray evaporation chamber 1 after being heated to 100°C; at the same time, the concentrated brine in the brine storage tank 10 is transported to the nozzle 8 by the pump 9, and then sprayed in the spray evaporation chamber in the form of mist In the inner cavity of chamber 1, it is in contact with the hot air flow and vaporized;

[0040] b) The water vapor obtained from the vaporization of salt water droplets is mixed with air, and the hot and humid air formed passes through the demister 2 and then discharged out of the spray evaporation chamber 1; the remaining salt water droplets after vaporization are concentrated at the bottom of the spray evaporation chamber 1 and condensed into high-concentration salt water , and discharged from the outlet at the bottom of the spray evaporation chamber 1; the high-concentration brine is used for salt production and the extraction of chemical elements such as p...

Embodiment 2

[0051] Device and working process are identical with embodiment 1, and difference is that the air flow that fan 11 produces is 139kg 干空气 / h, the heating temperature of the air in the heater 12 is 95°C, the temperature of the normal pressure hot and humid air produced by the spray evaporation chamber 1 is 70°C, and the water content is 0.27kg 水 / kg 干空气 , the fresh water output provided by the condensation of hot and humid air is 32.4kg / h. In this embodiment, the feed seawater flow rate of the multi-effect distillation device 4 is 221.1 kg / h, the fresh water output is 100.5 kg / h, and the salt content of the fresh water is 4.6 mg / L. The spray evaporation-multi-effect distillation process described in this embodiment increases the fresh water production by 32.24% on the basis of the common multiple-effect distillation process.

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Abstract

The invention discloses a desalting method and device. The method is designed to desalt seawater through low heat energy spray vaporization and multiple-effect seawater distillation. The invention pertains to a desalting technical field of seawater or brackish water. The desalting device comprises a spray and vapor room which is provided with a nozzle and a demister. An air inlet is connected with a separator of air and water, a fan and a heater are positioned on a connection pipe. The inlet and outlet of the first effect heating steam of the multiple-effect distillation device are separately communicated with an outlet of wet and heat air of the spray and vapor room and with a middle part port in the vapor and water separator. The second steam of the every effect is used as the heating steam for the next heating steam, but after heated and pressurized of the second steam of the final effect, the second heating steam is interfused into hot and damp air discharged from the spray vapor room. The tops of the multiple-effect distillation device are communicated with the tube pass of a shell and tube heat exchanger, and the bottom of the multiple-effect distillation device is communicated with a heavy salt water tube. The invention takes the advantages of low heat energy as the energy recourse of desalting process to couple spray vapor and multiple-effect distillation technic and realizes comprehensive utilization of the energy and resources.

Description

technical field [0001] The invention relates to a spray evaporation-multi-effect distillation seawater desalination method and device, belonging to the technical field of seawater or brackish water desalination. Background technique [0002] With the development of our country's society and economy, the problem of water shortage is becoming more and more serious, and seawater and brackish water desalination technology is an effective means to solve the problem of water shortage. The existing industrial seawater desalination methods are divided into two categories: thermal methods (such as multi-stage flash evaporation, multi-effect distillation) and membrane methods (such as reverse osmosis). Thermal desalination uses thermal energy to cause a phase change in brine, evaporates water, and then condenses to obtain fresh water; thermal desalination requires steam as a heat source, which requires high energy consumption, and requires a steam generating device, which is expensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F1/12C02F103/08
CPCY02A20/124
Inventor 高从堦高学理王铎成怀刚
Owner OCEAN UNIV OF CHINA
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