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Multi-effect distillation and multi-stage flash evaporation solar sea water desalination method

A multi-effect distillation and solar energy technology, applied in chemical instruments and methods, seawater treatment, multi-stage water treatment, etc., can solve the problems of low efficiency, low energy utilization rate, low water production, etc., and achieve high heat utilization coefficient, Low power consumption and low operating temperature

Inactive Publication Date: 2016-03-23
HEBI AUTOMOTIVE ENG PROFESSIONAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in solar desalination devices, the common problems are low efficiency, low energy utilization rate, and low water production.

Method used

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  • Multi-effect distillation and multi-stage flash evaporation solar sea water desalination method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: as figure 1 Shown, a kind of multi-effect distillation multi-stage flash solar seawater desalination method is:

[0012] ①The outlet of the cooling seawater is connected through the seawater conveying pipeline for desalination, the heat exchanger and the dripping pipe at the upper end of the high-efficiency distiller. The bottom of the second, third, fourth and final effect stills are connected to the upper and lower ends of the horizontal tube bundle respectively. The first effect still is connected and communicated with the second, third, fourth and final effect stills through the horizontal tube bundle. The end is connected to the condenser, the lower end is connected and communicated with the concentrated seawater outlet through the pump, the lower end of the condenser is connected with the mixing water tank and the fresh water tank, and the fresh water tank is connected and communicated with the fresh water outlet through the fresh water pump;

[001...

Embodiment 2

[0016] Embodiment 2: as figure 1 As shown, the upper end of the solar thermal storage mechanism of the multi-effect distillation multi-stage flash solar seawater desalination method is connected and communicated with the hot water tank, and the lower part passes through the level of the heat exchanger and the first effect distiller. The upper ends of the tube bundles are connected and communicated.

Embodiment 3

[0017] Embodiment 3: as figure 1 As shown, the upper end of the horizontal tube bundle in the condenser of the multi-effect distillation multi-stage flash solar water desalination method is connected and communicated with the cooling sea water inlet through the cooling sea water pump, and the lower end is connected with the cooling sea water outlet sea water and the sea water delivery pipeline for desalination They are connected and communicated. In the condenser, the seawater to be desalinated is used as the cooling medium to absorb the heat of the steam of the final effect still, and the temperature rises. However, the concentrated seawater at the outlet of the final effect still has a certain temperature, so a part of it is diverted from it and The desalinated seawater is mixed to increase the temperature of the seawater, and the mixed seawater enters the heat exchanger to further increase the temperature of the seawater.

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Abstract

The invention discloses a multi-effect distillation and multi-stage flash evaporation solar sea water desalination method. The method comprises the steps of: feeding sea water for desalination into a heat exchanger through a cooling sea water pump and a conveying pipeline for sea water for desalination; after heating the sea water to a saturated temperature by the heat exchanger, feeding the sea water into a tickling pipe in a first-effect distiller and tickling the sea water on a horizontal tube bundle, wherein the first-effect distiller is provided with heat quantity by solar heated hot water; exchanging heat with hot water in the horizontal tube bundle to generate steam as a heat source of a secondary-effect distiller; after saturated sea water from the previous effect distiller and condensed water flow into the next effect distiller for flash evaporation by virtue of a pressure difference between the effects, feeding the steam generated by the last-effect distiller and condensed water in the previous distiller together into a condenser to be condensed by cooled sea water and feeding the mixture into a fresh water tank; and finally, pumping the mixture out by a fresh water pump. As the heat exchanger is arranged in the system, by adopting horizontal tube falling film evaporation with a small temperature difference, heat quantity of concentrated sea water and last-effect steam are repeatedly used, so that the device has a higher energy utilization ratio and a higher water production rate.

Description

Technical field: [0001] The invention relates to a multi-effect distillation and multi-stage flash solar seawater desalination method suitable for areas where freshwater is scarce but seawater and brackish water are abundant, using solar energy as a heat source to drive a seawater desalination system to produce freshwater. Background technique: [0002] With the rapid development of the economy and the continuous increase of the population, the water consumption is also increasing rapidly, making water resources more and more scarce. In order to ensure life and develop production, people pay more and more attention to water conservation and reuse of water resources. At present, in solar seawater desalination devices, the common problems are low efficiency, low energy utilization rate, and low water production. Invention content: [0003] The technical problem to be solved by the present invention is to provide water and hot water heat exchangers and horizontal tube fallin...

Claims

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Application Information

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IPC IPC(8): C02F1/14C02F1/06C02F103/08
CPCC02F1/06C02F1/14C02F2103/08C02F2301/08Y02A20/124Y02A20/142Y02A20/212
Inventor 崔夏菁
Owner HEBI AUTOMOTIVE ENG PROFESSIONAL COLLEGE
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