Spiral-wound film component

Abstract

The invention discloses a spiral-wound film component, which comprises a central water production pipe and at least one water purification membrane set, wherein the at least one water purification membrane set is wound around the central water production pipe; the water purification membrane set comprises a water production diversion net, two plate type filter films and a raw water diversion net; a raw water flow channel is formed between the internal side surfaces of the two plate type filter films; a water production flow channel is formed between the external side surfaces of the two plate type filter films; the raw water diversion net is arranged in the raw water flow channel; the water production diversion net is arranged in the water production flow channel; and the thickness of the raw water diversion net is 0.18-0.35 mm. According to the invention, under the premise of ensuring that the minimum calculation flow speed of concentrated water is the same as that in the traditional scheme, the flow of concentrated water in the scheme provided by the invention is only one second to one third of the flow in the traditional scheme or even less; that is to say, the water-saving obvious is obvious; simultaneously, because the minimum calculation flow speed of concentrated water, which obviously influences blockage of a reverse osmosis film, is not decreased, the blockage prevention property of the reverse osmosis film is kept well or even improved.

Description

technical field [0001] The invention relates to a rolled membrane module. Background technique [0002] At present, the household roll-type reverse osmosis membrane widely used in the market, although its filtration accuracy is very high, figuratively speaking, except for hydrogen ions and hydroxide ions, almost no other ions can penetrate, so through the reverse osmosis membrane Filtered effluent is called pure water, and if used correctly, it usually lasts a long time and is not prone to clogging. One of the essential reasons why it is not easy to clog is that the flow velocity of the raw water flowing through the surface of the reverse osmosis membrane is high enough, the raw water flows while filtering on the surface of the membrane, and the particles in the water slide over the surface of the reverse osmosis membrane along the direction of the water flow, so that they cannot flow on the membrane surface. Surface deposition or accumulation, so the reverse osmosis membra...

AI Technical Summary

Problems solved by technology

However, the concentrated water flow rate is 390mL / min, and the pure water flow rate is 130mL / min (the meaning of 50GPD), that is, the ratio of the flow rate of pure water to concentrated water during operation is 1:3, and the concentrated water is basically discharged into the sewer as waste water , the raw water utilization rate is only 25%, resulting in a large amount of waste of water resources, which is unacceptable, so the household water purifier industry is eager to have a better technology: it will not significantly reduce the service life of the reverse osmosis membrane, but also can significantly Minimize the discharge of concentrated water

[0011] Another problem is that when the reverse osmosis membrane module is in normal operation, in order to overcome the osmotic pressure, the pressure on the raw water side is usually in the range of 0.42MPa to 0.60MPa, that is, the water pressure is relatively high, and such high-pressure water passes through a throttle valve (in the industry Also known as wastewater ratio), the pressure will be completely released, and this part of the pressure energy will not be utilized. The greater the flow rate of concentrated water discharge, the more pressure energy will be wasted

For large-scale reverse osmosis systems in industry, the more advanced solution is to recover and reuse this part of the pressure energy through an energy recovery device. However, in household water purifiers, the cost pressure of adding energy recovery devices cannot be tolerated, so this part energy is wasted

Although the pressure energy of a single household reverse osmosis water purifier is not large, the number of household reverse osmosis water purifiers is very large. At present, the most conservative estimate of household reverse osmosis water purifiers in use in my country is more than 20 million If a single machine wastes 2 kilowatt-hours of electricity a year, the country will waste 40 million kilowatt-hours of electricity every year, which is a very big waste

Images