Method for preheating inflow water of membrane method seawater softening device

A softening device, seawater technology, applied in chemical instruments and methods, general water supply conservation, multi-stage water/sewage treatment, etc., to achieve the effects of increasing membrane flux, small footprint, and reducing thermal pollution

Active Publication Date: 2012-07-18
OCEAN UNIV OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, especially for the defects that the membrane water treatment system cannot operate normally in winter and the current situation of the waste heat of oilfield produced water and the utilization of high-temperature cooling water heat energy in the industrial production process. A method for effectively utilizing the thermal energy of oilfield produced water generated after oil-water separation in an oilfield or the thermal energy of high-temperature cooling water in industrial production processes for preheating raw seawater in membrane seawater softening and desalination systems

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  • Method for preheating inflow water of membrane method seawater softening device

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Embodiment 1

[0017] The oilfield produced water is high-temperature water, and the membrane seawater softening device adopts nanofiltration technology with ultrafiltration as pretreatment; both the primary heat exchanger and the secondary heat exchanger use titanium plate heat exchanger; the temperature of high-temperature water is 50°C, the temperature of low-temperature seawater is 2°C, and the water recovery rate of membrane seawater softening device is 60%. The device, which exchanges heat countercurrently with the concentrated brine of the membrane seawater softening device, raises the seawater temperature to 8°C, and then enters the secondary heat exchanger for countercurrent heat exchange with high-temperature water, and the seawater temperature rises after the secondary preheating After reaching 22°C, it directly enters the membrane seawater softening device; the concentrated brine from the membrane seawater softening device returns to the primary heat exchanger to exchange heat wit...

Embodiment 2

[0019] The circulating cooling water of the power plant is high-temperature water, and the membrane seawater softening device adopts reverse osmosis technology with ultrafiltration as pretreatment; both the primary heat exchanger and the secondary heat exchanger use titanium plate heat exchangers; the temperature of high-temperature water The temperature of the low-temperature seawater is 42°C, the temperature of the low-temperature seawater is 2°C, and the water recovery rate of the membrane seawater softening device is 40%. Heater, the low-temperature seawater and concentrated brine exchange heat in countercurrent, so that the seawater temperature rises to 6°C, and then enters the secondary heat exchanger to perform countercurrent heat exchange with high-temperature water, and the seawater temperature after the secondary preheating rises to 18°C After that, it directly enters the membrane softening process; the concentrated brine from the membrane seawater softening device re...

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Abstract

The invention relates to a method for preheating inflow water of a membrane method seawater softening device, belonging to the technical filed of oilfield development and seawater desalination. The method comprises the following steps of: firstly, exchanging the heat between low-temperature seawater and produced water or drained strong brine of the membrane method seawater softening device in a primary heat exchanger, recovering the waste heat of the drained strong brine, exchanging the heat between the seawater undergoing primary preheating and produced water with crude oil separated in a secondary heat exchanger, continuing to increase the temperature of the seawater, leading the seawater undergoing two stages of preheating into the membrane method seawater softening device, and separating the seawater to obtain the product water; and collecting the drained strong brine of the membrane method seawater softening device, returning the drained strong brine back to the primary heat exchanger to preheat low-temperature inlet seawater, leading the strong brine into a strong brine drainage pipeline after releasing heat and cooling down, and leading the oilfield produced water into a produced water reinjection pump station pipeline after releasing heat and cooling down so as to realize the two-stage preheating of inflow water of the membrane method seawater softening device. The method has the advantages of simple principle, convenience for operation, reliable running, energy saving, environment friendliness and practical value.

Description

Technical field: [0001] The invention relates to a method for preheating the water intake of a membrane seawater softening device, in particular to a method for making the membrane seawater softening device normally run in winter through a two-stage preheating process, and belongs to the technical field of marine oilfield development and membrane seawater desalination . Background technique: [0002] The membrane flux of the membrane water treatment system is an important indicator of system design, and the system inlet water temperature is an important factor affecting the membrane flux. Under the condition of a certain operating pressure of the system, if the raw water temperature is too low, the water production of the system will be greatly reduced. For example, every time the temperature drops by 1°C, the flux of the reverse osmosis seawater desalination membrane will drop by about 4%. Winter in northern my country is cold, and the seawater temperature is low. For exa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/44
CPCY02A20/131
Inventor 苏保卫高学理李红海
Owner OCEAN UNIV OF CHINA
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