Low temperature multiple-effect distillation seawater desalination system and process flow thereof

A technology of multi-effect distillation and process flow is applied in the process field of preheating feed seawater, which can solve problems such as low desalination efficiency, and achieve the effect of saving cost and improving efficiency.

Inactive Publication Date: 2009-06-24
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Abstract
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Problems solved by technology

[0012] In order to overcome the defect of low desalination efficiency in the typical seawater desalination process flow commonly used in the prior art, the present invention provides a low-temperature multi-effect distillatio...

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  • Low temperature multiple-effect distillation seawater desalination system and process flow thereof

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Embodiment

[0030] An embodiment shown in the accompanying drawing is a 7-effect group preheating feed process. In the accompanying drawing, the evaporator is divided into two evaporation groups. The first to third effect evaporators are the first evaporation group, and the fourth to third effect evaporators are the first evaporation group. The 7th effect evaporator is the second evaporation group. Take this embodiment as an example to further describe its technological process below:

[0031] First, raw seawater enters the condenser 8, part of it is discharged through the cooling water pump 26 after preheating, and the remaining part enters the second evaporation group through the feed pump 31 as feed seawater. In the second evaporation group, the seawater enters the 4th to 7th effects in parallel. Before feeding the 4th effect, the seawater is preheated by the heater 24 first. The 24 heater uses the secondary steam of the 4th effect to preheat the raw water. The preheated seawater ente...

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Abstract

The invention discloses a low-temperature multieffect seawater distillation desalting system. The system comprises a plurality of multi-effect evaporator sets; each evaporator set is at least provided with a heater for preheating feeding seawater; an effect intermediate pump is arranged between two adjacent multi-effect evaporators; and one end of a condenser is connected with a raw material water pump, and the other end of the condenser is connected with the last evaporator set of the plurality of the multi-effect evaporator sets. The invention also discloses a process flow for utilizing the low-temperature multieffect seawater distillation desalting system to desalt seawater; the evaporators of the low-temperature multi-effect seawater distillation desalting system are divided into a plurality of sets; each set feeds in parallel; simultaneously, the front of the feeding seawater of the highest-temperature effect evaporator of each set is provided with a heater; residual strong brine of the front evaporator set is collected and beaten to the next evaporator set through the effect intermediate pump, and so on; a product water and strong brine flow in a ladder shape in a series of flash tanks and are gradually subjected to flash evaporation and cooling; steam obtained through flash evaporation enters the evaporator; and finally, the product of the cooled water and the strong brine are pumped out through a corresponding water pump respectively.

Description

technical field [0001] The invention relates to a low-temperature multi-effect distillation seawater desalination process used in the field of seawater desalination, in particular to a method of using pressure difference to flash steam to improve efficiency, and at the same time to use the flash steam to feed certain groups of materials The process of preheating the feed seawater of the effect evaporator. Background technique [0002] Low-temperature multi-effect distillation refers to operating below 70°C. Around 1981, this technology has been formally applied to industrial seawater desalination systems. It is characterized in that a series of horizontal tube spray falling film evaporators are connected in series. The steam input is through multiple evaporation and condensation, and the evaporation temperature of the latter effect is lower than that of the previous effect, so as to obtain distilled water that is multiple times the amount of steam. [0003] In low-temperatu...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F103/08
CPCY02A20/124
Inventor 齐春华赵河立初喜章谢锋范明明
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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