Small solar multistage falling film evaporation heat regeneration type seawater desalting device

Abstract

The invention discloses a small solar multistage falling film evaporation heat regeneration type seawater desalting device which comprises eight working stages which are serially connected in sequence from front to rear, wherein the first working stage is in a heat collection structure and is formed by connecting at least one first heat collection unit in parallel; the second to seventh working stages are all in heat collection / evaporation / condensation three-in-one structures, and each working stage comprises a second heat collection unit; steam is cooled and condensed stage by stage under the condition of non negative pressure by controlling the working temperature of the first to seventh working stages; the eighth working stage is in a cooling structure, all steam is condensed into fresh water, and the fresh water is collected and stored. According to the device, a solar medium-temperature heat collector, a heat pipe and a falling film evaporation / condensation device are integrated by adopting medium-temperature medium-pressure steam stage-by-stage cooling and heat regeneration, heat-pipe heat transfer and gravity type liquid drop falling film evaporation technologies, no power device is needed, the heat utilization efficiency and the water production efficiency are improved, and the cost is reduced; the device is suitable for fishing boats, sea islands and desert areas, and has a relatively good application value.

Description

technical field [0001] The invention relates to a solar energy seawater desalination device, in particular to a small solar energy multistage falling film evaporation heat recovery type seawater desalination device for seawater desalination and water purification treatment, belonging to the field of solar energy technology. Background technique [0002] Fresh water is one of the basic materials for the survival and development of human society. The earth's surface area is about 510 million square kilometers, of which the ocean area accounts for 70.8% of it. Judging from the amount of water per capita on the earth, water resources are very abundant, and it seems that human beings should not be in danger of water shortage. However, the seawater that cannot be directly drunk or irrigated due to its high salinity accounts for more than 97% of the total water on the earth, and the remaining fresh water is less than 3%, and its distribution is extremely uneven. Frozen in the pol...

AI Technical Summary

Problems solved by technology

These devices have the following common problems, making it difficult to miniaturize and commercialize the devices

One is that the multi-stage heat recovery method of metal tube falling film evaporation makes the evaporation and condensation device huge and complicated; the other is that due to the low temperature of the heat source, these solar desalination devices must use vacuum pumps to maintain negative pressure operation, so the sealing of the device The requirements are very high, and the vacuum pump is relatively expensive, and it is easy to be damaged if it works continuously for a long time

In addition, the low temperature of the solar collector is also a main reason why the total thermal efficiency and evaporation efficiency of the solar desalination device are low, making it difficult to commercialize

In addition, the traditional solar desalination device is separated from the solar heat collector and the subsequent evaporation and condensation device. The solar heat collector only serves as a heat source supply, which also makes the whole system large and expensive, and the cost performance is very low. Small and medium-sized solar desalination devices can be used commercially

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