Solar energy self-produced fresh water planting device capable of using seawater for direct irrigation

Abstract

The present invention discloses a solar energy self-produced fresh water planting device capable of using seawater for direct irrigation and belongs to the technical fields of solar energy concentration utilization and new agricultural facilities. The planting device is composed of a concentration reflector, a seawater tank, a condensation cavity, planting cavities, etc.; the planting cavities areprovided with water absorbing materials and soil; sunlight enters the device from a transparent cover plate on the upper part of the device, and is reflected by the reflector inside the device and directly projected into the seawater tank through a lower light-transmitting plate; seawater in the seawater tank absorbs the sunlight and thus temperature of the seawater is improved to finally realizea seawater evaporation process; steam condenses into fresh water on the inner surface of the condensation cavity; the fresh water is transported to the bottom parts of the planting cavities; the planting cavities are provided with the water absorbing materials; the water absorbing materials absorb water by capillary functions; and water is transported to the planting soil in the upper part for crop growth. The device integrates a seawater desalination system and a plant planting system into a whole structure and can be spliced in large quantities to achieve large-scale seawater desalination or crop planting by using the seawater.

Description

technical field [0001] The invention relates to a solar self-produced fresh water planting device which can be directly irrigated by seawater. The utility model relates to desalination of seawater by using solar energy and applying it to agricultural planting projects, which belongs to the technical field of concentrated solar energy utilization and new agricultural facilities. Background technique [0002] There is a serious shortage of fresh water resources and land resources in many parts of the world. Crop irrigation occupies 70% of the fresh water resources on the earth, and the shortage of irrigation is becoming increasingly prominent. If solar energy can be used for desalination of seawater, it is convenient and quick to produce fresh water and nearby The growth of crops provided can not only solve the problem of fresh water shortage, but also solve the shortage of agricultural land, which will realize people's longing for marine agricultural projects. [0003] On th...

AI Technical Summary

Problems solved by technology

In the past 100 years, people have made great efforts to use solar energy to desalinate seawater. However, solar desalination technology still cannot be widely used because its economy cannot be compared with traditional industrial seawater desalination systems.

[0004] The analysis shows that the main reasons for the high economic cost of solar seawater desalination are as follows: (1) The traditional solar seawater desalination system is mainly composed of three parts: solar collector, heat storage and desalinator, and lengthy pipelines are required between the three Pipelines are connected to each other, resulting in large heat transfer resistance and increased heat loss in the pipelines, resulting in low overall system efficiency

(2) The construction cost of solar heat collection system is too high

According to analysis, about 80% of the cost of solar desalination system comes from the solar collector side.

(3) The solar heat collection system occupies a large area and the cost of land occupation is high, which is especially unfavorable for places where land resources are scarce, and also increases the management cost of the system

But not all plants can accept direct seawater irrigation, and setting up traditional seawater desalination systems near the shore not only takes up land resources but also requires lengthy pipelines to transport fresh water to farmland, and traditional seawater desalination technology will also cause environmental pollution. pollution, so these are not the most direct and efficient ways to develop marine agriculture

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