Solar zero-liquid-discharge sea water desalting plant and method

A discharge device and solar energy technology, applied in chemical instruments and methods, seawater treatment, general water supply conservation, etc., can solve the problems of small water production, low thermal efficiency and solar water production rate, and affect the fresh water recovery rate, so as to achieve the goal of water content Effect

Inactive Publication Date: 2012-10-17
TIANJIN CHENGJIAN UNIV
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AI Technical Summary

Problems solved by technology

[0003] Since the desalination process is accompanied by the consumption of electric energy or heat energy, from the perspective of environmental protection and sustainable development, there are many technical researches on seawater desalination with waste heat or clean energy solar energy, mainly photothermal solar desalination and photovoltaic reverse osmosis desalination 1. Humidification and dehumidification desalination, among which thermal solar desalination is mainly a simple connection between the existing thermal seawater desalination technology and solar heating to generate steam. The thermal efficiency and solar water production rate per unit area are low. For a long time, solar energy is a discontinuous energy source, and continuous operation requires other auxiliary energy sources; the energy conversion rate of solar photovoltaic reverse osmosis seawater desalination is low; the main unit of desalination by humidification and dehumidification is the heat collection area of ​​solar energy is small water production
[0004] From the perspe...

Method used

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  • Solar zero-liquid-discharge sea water desalting plant and method

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Embodiment 1

[0034]A solar zero liquid discharge seawater desalination device of the present invention comprises a hot air heating device composed of a fan 1, an air volume regulating valve 2 and a concentrating solar air heat collector 3; it is characterized in that: the original seawater storage tank 16, a booster pump 15. The filter 14 and the nozzle 10 form a pressure spray device. The pressure at the front end of the nozzle 10 before atomization is 0.5MPa; connected, the atomizing evaporator 4 is provided with a multi-outlet hot air distributor 9, and wet air outlets with screens 6, 7, 8, 11; the high-temperature saturated hot air coming out from the upper part of the atomizing evaporator is wet-saturated The fresh water condensed by the air condenser 12 enters the fresh water storage tank 13, and the solid crystal storage tank 5 is obtained from the outlet of the lower part of the atomization evaporator. , and then to nozzle 10.

Embodiment 2

[0036] In the solar zero liquid discharge seawater desalination method of the present invention, the raw seawater is pressurized by the raw seawater storage tank 16 through the booster pump 15 , passes through the micron filter 14 , and then reaches the nozzle 10 . The liquid droplets atomized by the nozzle 10 are in contact with the dry hot air at the outlet of the multi-outlet hot air distributor 9 multiple times during the evaporation process to realize multi-stage nano-evaporation.

[0037] Solar zero liquid discharge seawater desalination process: seawater with a salt content of 35000mg / L is pressurized to 0.6MPa by the original seawater storage tank 16 through the booster pump 15, passes through the filter 14 with a specification of 10 microns, and then reaches the nozzle 10. The median diameter of the atomized volume of the nozzle 10 is 120 μm, and the trough-type concentrating solar air is heated, and the air temperature at the 3 outlet is 265 ° C. After passing through...

Embodiment 3

[0039] 4m 2 A parabolic concentrating heat collection system with a horizontal focal length of 27.5mm, the heat receiving tube is a φ58 / 70 double-pass vacuum heat collection tube, and the air flow rate is 25m 3 / h, the air temperature rises from the ambient temperature of 23°C to 260°C, the seawater at 20°C is atomized at a flow rate of 3L / h under a pressure of 0.4MPa, and the outlet humid air temperature is controlled at 75°C, the water in the seawater is completely evaporated, and crystallized salt is obtained 100g, while also obtaining 3L of fresh water with a salt content of 300mg / L.

[0040] This embodiment has the solar energy zero liquid discharge seawater desalination device and method, the process is simple, no need to add any chemical additives, and zero liquid discharge is realized.

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Abstract

The invention relates to a solar zero-liquid-discharge sea water desalting plant and method. Moisture in sea water is evaporated quickly at low energy consumption by using a liquid spray method and multistage hot air contact; 100-400 DEG C hot air is supplied by a condensation solar heat collector, micro-dimension sea water drops perform moisture diffusion and heat transfer with dry hot air many times, nano drop characteristic evaporation is implemented an atomization evaporator, the obtained high-temperature saturated moist air is cooled by a saturated moist air condenser to obtain fresh water, the rest low-temperature saturated air is exhausted, and solid crystals are taken out from the bottom of the atomization evaporator. The invention is suitable for desalting of sea water, or concentration separation or liquid-solid separation of bitters and other electrolyte water solutions. The invention has the advantages of perfect structure, strong automatic control performance and high efficiency, and fully utilizes the solar energy.

Description

technical field [0001] The invention belongs to the technology of atomizing and separating liquid electrolyte by using solar energy, and in particular relates to a solar zero liquid discharge seawater desalination device and method. Background technique [0002] As an important way to replenish fresh water, with the development of seawater desalination technology, especially the application of energy recovery devices in membrane technology and the improvement of membrane performance, seawater desalination is increasingly used as a means of sustainable development of freshwater resources. The country develops. However, the water recovery rate of the current seawater desalination method is low. The thermal seawater desalination device requires a large amount of seawater due to steam condensation, so the freshwater recovery rate is 20% to 50%, and the water recovery rate of the membrane seawater desalination device is only 30%~ 40%, and most of the remaining seawater becomes b...

Claims

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Application Information

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IPC IPC(8): C02F1/14C02F103/08
CPCY02A20/124Y02A20/142Y02A20/212
Inventor 苏润西
Owner TIANJIN CHENGJIAN UNIV
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