Low-temperature multiefffect distilled seawater desalination system

A multi-effect distillation and low-temperature hot water technology, which is applied in seawater treatment, general water supply saving, heating water/sewage treatment, etc. Problems such as high power consumption, to achieve the effect of improving water production rate and energy utilization rate, solving high cost of water production and low power consumption of the system

Inactive Publication Date: 2016-11-16
BEIJING JINDAYU ENVIRONMENT TECH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Direct use of steam for desalination of seawater has problems such as high cost of steam, waste caused by high pressure and low utilization, relatively large tendency of scaling of seawater desalination equipment, etc.
[0005] Industrial and mining enterprises have quite rich waste heat resources, but most of the low-temperature waste heat cannot find a suitable way to use, and is often discharged in the form of waste heat
At present, the utilization of low-temperature waste heat resources faces the following problems: (1) part of the hot water is used for heating in winter, but there is nowhere to consume this part of hot water in summer; Production, but the cooling tower consumes a lot of electricity, and the cost of electricity is exchanged for low-temperature fresh water resources, so the economy is poor

Method used

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  • Low-temperature multiefffect distilled seawater desalination system

Examples

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Effect test

specific Embodiment 1

[0047] use as figure 1 The low-temperature multi-effect distillation seawater desalination system shown in the process uses the low-temperature waste heat of a steel company to desalinate seawater.

[0048] Such as image 3 The seawater with the indicated water quality index is removed by the grille to remove larger debris, and then pumped up into the mixed flocculation sedimentation tank. After sedimentation, clarification and separation, the floc sludge is discharged into the sludge system for treatment, and the clean water is pumped up and sent to low temperature. Multiple effect distillation unit.

[0049] The clear water of the sedimentation tank is preheated in the condenser 1, and then divided into two streams, one stream returns to the sea, and the other stream enters the evaporator as raw sea water.

[0050] The raw seawater is firstly treated with antiscalant and defoamer to avoid the risk of fouling of heat exchange tubes in the evaporator and improve the quality ...

specific Embodiment 2

[0055] use as figure 1 The low-temperature multi-effect distillation seawater desalination process shown in the process uses the waste heat of a thermal power plant enterprise to desalinate seawater.

[0056] Such as Figure 5 The seawater with the indicated water quality index first passes through the grid to remove larger impurities, and then passes through the self-cleaning filter to remove smaller impurities, and then is pumped and pressurized to be sent to the low-temperature multi-effect distillation device.

[0057] The clear water of the sedimentation tank is preheated in the condenser 1, and the heated seawater enters the evaporator as the material seawater of the distillation process.

[0058] The raw material seawater is firstly treated with antiscalant and defoamer to avoid the risk of fouling of heat exchange tubes in the evaporator and improve the quality of fresh water. The dosage of scale inhibitor is 3.0mg / L, and the dosage of antifoaming agent is 0.08mg / L. ...

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Abstract

The invention relates to a low-temperature multiefffect distilled seawater desalination system, which comprises a zero-effect vapor generator, n-effect evaporators, a vapor condenser and a vacuumizing system, wherein high-temperature hot water flows in the zero-effect vapor generator through a high-temperature hot water pipe, the zero-effect vapor generator generates starting vapor, the vapor flows in the first-effect evaporator through a pipeline, vapor generated in the first-effect evaporator flows in the next-effect evaporator through a pipeline, until flows in the nth-effect evaporator, and vapor generated in the nth-effect evaporator flows in the vapor condenser to form finished water. By directly utilizing low-temperature residual heat unutilized by industrial mining enterprises, the water production cost of seawater desalination can be greatly lowered, the low-temperature multiefffect distilled seawater desalination system is an important action of offshore industrial and mining enterprises to realize energy saving and emission reduction, electricity consumption is reduced by adopting a hot water direct driven optimized scheme, and the water productivity and energy utilization rate of the whole system can be improved by adopting width counter flowing feeding mode through reasonable design optimization.

Description

technical field [0001] The invention relates to the technical field of low-temperature multi-effect seawater desalination, in particular to a low-temperature multi-effect distillation seawater desalination system. Background technique [0002] Coastal industrial and mining enterprises are large energy and water consumers. If the low-temperature waste heat of these industrial and mining enterprises is used for seawater desalination, it will not only make reasonable use of waste heat resources, but also solve the problem of shortage of fresh water resources. [0003] Low-temperature multiple-effect distillation (LT-MED) seawater desalination technology refers to seawater desalination technology with a maximum evaporation temperature of about 70°C. A series of horizontal tube falling film evaporators are connected in series and divided into several effects, using a certain amount of steam Enter the evaporator, and through multiple evaporation and condensation, distilled water i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/04C02F103/08
CPCC02F1/04C02F2103/08Y02A20/124
Inventor 张万松尹胜奎曹文彬吴桂霞张会曹普晅曹海燕耿天甲曹真齐增敏王永胜
Owner BEIJING JINDAYU ENVIRONMENT TECH CO LTD
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