Adverse current closed type multistage seawater desalination system and method

A seawater, closed technology, applied in chemical instruments and methods, seawater treatment, general water supply conservation, etc., can solve problems such as limiting the effect of heat and mass exchange between air and seawater, improve water production and water production efficiency, and achieve heat capacity. Matching, optimal heat effect

Inactive Publication Date: 2011-10-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this device, the contact form between the air and the high-temperature seawater spraying process is a cross-flow flow pattern, which limits the effect of heat and mass exchange between the air and seawater.

Method used

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  • Adverse current closed type multistage seawater desalination system and method
  • Adverse current closed type multistage seawater desalination system and method
  • Adverse current closed type multistage seawater desalination system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 As shown, this embodiment includes a first-stage heat exchanger 1, a second-stage heat exchanger 2, and a third-stage heat exchanger 3, as well as a first-stage spray tower 4, a second-stage spray tower 5, and a third-stage heat exchanger. Level spray tower 6. The heat exchange tubes of the three-stage heat exchangers 1, 2, and 3 are connected in series, and the inlet of the heat exchange tubes of the first-stage heat exchanger 1 is connected to a seawater inlet pipe 7, and a seawater pump 8 is arranged on the seawater inlet pipe 7; The outlet of the heat exchange tube of the heater 3 is connected to a solar heat collector 9 through a pipeline, and the outlet of the solar heat collector 9 is connected to a plurality of spray heads 10 arranged on the top of the first-stage spray tower 4 through a pipeline. The three-stage spray towers 4, 5, and 6 are connected. Each stage of the spray tower is provided with a section of packing 11. There is an evaporat...

Embodiment 2

[0027] Such as figure 2 As shown, the basic configuration of this embodiment is the same as that of Embodiment 1, the difference is that the seawater heating device is different, and a set of conventional heat pump circulation system 20 is set to replace the solar heating system 9 . The heat pump circulation system 20 includes: a condenser 21 arranged on the pipeline between the water outlet of the heat exchange tube of the third stage heat exchanger 3 and the water inlet of the first stage spray tower 4, and arranged on the spray seawater discharge pipe 15 An evaporator 22 on the top, a compressor 22 is arranged on the pipeline between the evaporator 21 and the condenser 23, and an expansion valve 24 is arranged on the pipeline between the condenser 21 and the evaporator 22.

[0028] When this embodiment is working, the two countercurrent heat exchange processes are the same as in Embodiment 1, the difference is that: the seawater flowing out from the water outlet of the thi...

Embodiment 3

[0030] Such as image 3 As shown, this embodiment is basically the same as Embodiment 2, and a set of conventional heat pump circulation system 20 is also provided. It differs from Embodiment 2 in that: the evaporator 22 is not arranged on the spray seawater discharge pipe 15, but It is arranged on the return air pipe 14 between the bottom of the first-stage heat exchanger 1 and the bottom of the third-stage spray tower 6, and is connected to the fresh water collection pipe 13 in parallel at the bottom of the evaporator 22 through a pipeline.

[0031] When this embodiment works, the difference from Embodiment 2 is that the evaporator 22 absorbs the heat from the low-temperature hot and humid air entering the third-stage spray tower 6 from the first-stage heat exchanger 1 .

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Abstract

The invention relates to an adverse current closed type multistage seawater desalination system and a method, the adverse current closed type multistage seawater desalination system comprises a multistage heat exchanger containing heat exchange tubes in series step by step. An inlet of a heat exchange tube of a first stage heat exchanger is connected with an inlet pipe through a sea water pump, aheat exchange tube of a last stage heat exchanger is connected with a seawater heating device; the seawater heating device is connected with several spray head arranged at the top in a spray tower through pipelines, a communicated multistage spray tower is formed by multistage filling materials in the spray tower, evaporation space of each stage filling material is respectively connected with thecorresponding top of heat exchanger though the other end of a vapor pipe, the bottom of each stage heat exchanger is respectively connected in parallel with a fresh water collecting pipe through a pipeline, a breather pipe is inserted at the bottom of each stage heat exchanger, the breather pipe at the bottom of the next stage heat exchanger is respectively communicated with the top of the cylindrical shell of the preceding stage heat exchanger, the breather pipe at the bottom of the first stage heat exchanger is connected with the lower part of the last stage spray tower through a steam return, the bottom of the last stage heat exchanger is connected with a discharge pipe of sprayed sea water. According to the invention, the water volume and the efficiency of producing water can be effectively enhanced.

Description

technical field [0001] The invention relates to a seawater desalination system and method, in particular to a countercurrent closed seawater desalination system and method. Background technique [0002] At present, the main methods of seawater desalination include thermal separation method, membrane method and chemical method, among which thermal separation method has higher requirements on temperature; membrane method is to obtain fresh water by pressurizing water molecules through a semi-permeable membrane. The requirements are relatively high; the chemical method uses ion exchange or hydrate formation to separate fresh water from seawater, but the power consumption is relatively high. Similarly, using the heat and mass exchange process between air and seawater and the condensation process of humid air to precipitate fresh water is also a method of desalinating seawater. In this method, on the one hand, when the air is in direct contact with water (or salt solution), heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/12C02F1/14C02F103/08
CPCY02A20/124Y02A20/142Y02A20/212
Inventor 刘晓华张涛江亿魏庆芃
Owner TSINGHUA UNIV
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