Serial multi-stage isothermal heating multiple-effect heat return humidifying and dehumidifying solar-powered seawater desalination machine

Abstract

The invention provides a serial multi-stage isothermal heating multiple-effect heat return humidifying and dehumidifying solar-powered seawater desalination machine comprising a solar heat collector, a hot water storage tank, a plurality of humidifying towers, a dehumidifying tower, seawater spray heads, a draught fan, a plastic pellet, a stainless steel disc, a condenser and a water pump, wherein the plurality of humidifying towers can be connected in series; the tops of the humidifying towers are provided with the seawater spray heads; part of feed seawater and humid high-temperature air in the dehumidifying tower are subjected to heat exchange in the condenser, then, part of the seawater is directly sprayed on the surface of the plastic pellet to form a seawater film with a large contact area, the seawater film is subjected to heat and humidity exchange with air flowing from bottom to top to form saturated humid air which is delivered into the dehumidifying tower under the action of the draught fan and is condensed by the feed seawater to generate fresh water, the residual feed seawater is divided into a plurality of paths and is simultaneously delivered into the hot water storage tank after absorbing the latent heat of the humid air so as to continue to be heated to raise the temperature, and then, the residual feed seawater is sprayed after entering the corresponding humidifying tower and is condensed in the dehumidifying tower to generate the fresh water. By using the serial multi-stage isothermal heating multiple-effect heat return humidifying and dehumidifying solar-powered seawater desalination machine, the utilization ratio of solar energy in a seawater desalination device is increased.

Description

technical field [0001] The invention relates to a seawater desalination machine, in particular to a tandem multi-stage isothermal heating multi-effect regenerative humidification dehumidification solar seawater desalination machine, which belongs to the technical field of solar seawater desalination and water treatment. Background technique [0002] Currently, about one-third of the world's population lives in water-scarce countries and regions, and by 2025, this number will increase to two-thirds. To solve the problem of shortage of fresh water resources, one of the most important ways is to desalinate seawater (brackish water). However, the traditional seawater (brackish water) desalination technology needs to consume a large amount of conventional energy, aggravating the consumption of resources and causing environmental pollution. Combining solar energy technology with seawater (brackish water) desalination technology is one of the effective measures to solve the overus...

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Problems solved by technology

[0003] Application number 201010509740.X discloses a spray evaporative air humidification and dehumidification solar seawater desalination device, which uses air condensation, but the cooling effect is poor, the seawater is not preheated and the temperature difference with the hot air is large, and an additional condensing heat exchanger is required to cause the device complex structure

[0004] Application No. 201110304566.X discloses a semi-dry gas humidification and dehumidification type seawater desalination system and method. After heat exchange, the humid air is directly discharged from the device, resulting in heat loss, and the amount of seawater entering the spouted bed evaporator is difficult to control and is easy to form at the bottom. Accumulated water blocks the air nozzle, and the heat exchange medium does not form an effective circulation

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