A multiple-effect casing tube-type solar energy seawater desalination apparatus having a light-condensing function

Abstract

The invention relates to a multiple-effect casing pipe-type solar energy seawater desalination apparatus having a light-condensing function and belongs to the fields of solar energy collection technology, seawater desalination technology and water treatment technology. The multiple-effect casing pipe-type solar energy seawater desalination apparatus comprises multi-layer casing pipes; water troughs are disposed between the casing pipes and have upward openings; the bottom of the whole apparatus is provided with a solar energy condenser, which converges sunlight to the innermost water trough for generating heat energy and realizes evaporation of steam; the generated steam condenses on an inner wall of the innermost casing pipe and generates fresh water while heating the seawater in a next outer water trough and causes evaporation again; the process proceeds in the same way successively among the casing pipes until the outermost casing pipe; the water troughs are connected through a connecting pipe, so the seawater can flow from the outermost water trough to the innermost water trough; the fresh water condensed on the inner walls of all layers of casing pipes are converged for output; and an end face of the outermost casing pipe is sealed and the whole apparatus is put in a state of vacuum through a vacuum pump, thereby being in favor of the evaporation of the seawater.

Description

technical field [0001] The invention relates to a solar seawater desalination device, in particular to a multi-effect sleeve type solar seawater desalination device with light concentrating function, belonging to the technical fields of solar heat collection, seawater desalination and water treatment. Background technique [0002] There are many ways to produce fresh water from seawater or brackish water, but there are mainly two types of relatively mature and large-scale technologies at present, one is the so-called membrane seawater desalination system using reverse osmosis membrane technology, and the other is the use of thermal energy Driven by the so-called distillation desalination system. Membrane systems have high cost and operating costs (mainly because the service life of the reverse osmosis membrane is not long), and have the disadvantages of large one-time investment and the need to consume conventional electric energy, which is not conducive to energy saving and...

AI Technical Summary

Problems solved by technology

However, there are four obvious defects in the existing solar disc distillation device: (1) The latent heat released during the condensation of steam into fresh water is not reused, but is directly emitted into the environment, resulting in low energy efficiency of the device; (2) ) The natural convection heat transfer mode under normal pressure adopted by the existing device does not strengthen the evaporation and condensation process of water vapor, so the heat transfer coefficient is not high, which greatly limits the improvement of device performance

(3) The heat capacity of the raw water to be evaporated in the device is too large, which limits the increase of its operating temperature, weakens the driving force of the evaporation process, and greatly delays the water outlet time of the device; (4) The existing disc solar distiller occupies an area The large area is not conducive to saving land costs

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