Forward-condensing multiple-effect back-heating array type humidification and dehumidification solar-powered seawater desalination device

Abstract

The invention discloses a forward-condensing multiple-effect back-heating array type humidification and dehumidification solar-powered seawater desalination device which comprises condensers, humidifiers, condensing apparatuses and air channels. Solar light incident from the upper side is condensed through the condensers, penetrates through glass cover plates to reach the surfaces of the humidifiers and is converted into heat energy. Seawater is sprayed on the humidifiers, absorbs vapor of the solar heat energy and performs heat and humidity exchange with air to form saturated wet air, and the high-temperature wet air enters condensation cavities under driving of fans and performs heat exchange with cold seawater to produce fresh water. After the seawater flows out of the condensers, a part of seawater is supplemented and sprayed on the humidifiers, and the residual seawater is discharged out of a system. Non-evaporated saline water drops on saline water plates to be recycled, and redundant saline water is discharged out of the device through the bottoms of the plates. The device can form the multiple-effect system in an arrayed mode, multiple effect structures are identical, the high-temperature high-humidity air and the saline water in one saline water plate are respectively delivered to another effect structure to heat the saline water in the corresponding condenser and cool the wet air, and latent heat discharged during vapor condensation is recovered to achieve the purpose of efficient seawater desalination.

Description

technical field [0001] The invention relates to a device for directly heating seawater by concentrating solar energy to evaporate it, and extracting fresh water through an air humidification and dehumidification process, belonging to the technical fields of solar heat utilization, seawater desalination and water treatment. Specifically, it relates to a forward concentrating multi-effect heat recovery array type humidification and dehumidification solar seawater desalination device. Background technique [0002] At present, the biggest problem of solar desalination is high cost and small scale. In terms of cost, the current water production price of a large-scale reverse osmosis desalination system is about 5-8 yuan / ton; a large-scale low-temperature multi-effect seawater desalination system is generally combined with a power plant, and the cost is about 8-10 yuan. As for the solar desalination system, the current price of water production is more than 20 yuan / ton. This is b...

AI Technical Summary

Problems solved by technology

[0002] At present, the biggest problem of solar desalination is high cost and small scale

In terms of cost, the current water production price of a large-scale reverse osmosis desalination system is about 5-8 yuan / ton; a large-scale low-temperature multi-effect seawater desalination system is generally combined with a power plant, and the cost is about 8-10 yuan

As for the solar desalination system, the current price of water production is more than 20 yuan / ton. This is based on the system life of 20 years and the average collector water production per square meter of 12 liters / day. The actual price may be higher than this.

In terms of scale, currently the largest solar desalination system in the world is only tens of tons per day, which is far behind the reverse osmosis system, and cannot match the water production of the low-temperature multi-effect system

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