High-utilization-rate ultrapure water system for photovoltaic system

Abstract

The utility model discloses a high-utilization-rate ultrapure water system for a photovoltaic system, which comprises a pretreatment device, a high-utilization-rate ultrapure water tank and a water supply device, a water inlet of the ultrafiltration water tank is connected with a water outlet of the pretreatment device; a water inlet of the primary pure water treatment device is connected with a water outlet of the ultrafiltration water tank; the water inlet of the secondary pure water treatment device is connected with the water outlet of the primary pure water treatment device; wherein the primary pure water treatment device comprises a primary reverse osmosis treatment device and a primary reverse osmosis water tank, and the secondary pure water treatment device comprises a secondary reverse osmosis treatment device and a secondary reverse osmosis water tank; the primary pure water treatment device is connected with the ultrafiltration water tank through the reverse osmosis concentrated water recovery device; and the secondary pure water treatment device is connected with the ultrafiltration water tank through a backflow pipeline. According to the high-utilization-rate ultrapure water system for the photovoltaic system provided by the embodiment of the utility model, through a multi-stage concentrated solution recovery mechanism, the comprehensive utilization rate of water resources is remarkably improved, and wastewater discharge is reduced.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a high-utilization ultrapure water system for photovoltaic systems. Background Technology

[0002] In the production process of photovoltaic equipment, the preparation of ultrapure water is one of the core links to ensure product performance, especially ultrapure water with an output resistance of 18 megohms, whose purity directly determines the efficiency and reliability of photovoltaic cells. Currently, ultrafiltration membranes, reverse osmosis membranes, and electrodeionization (EDI) devices are widely used as core equipment in ultrapure water systems, providing reliable assurance for ultrapure water production through their efficient filtration and desalination capabilities. However, although these core devices are relatively mature in technology, they all generate corresponding concentrates during operation, such as ultrafiltration concentrate, reverse osmosis concentrate, and EDI concentrate. In existing technologies, these concentrates are usually directly discharged or simply reused, lacking an efficient multi-stage recovery mechanism, leading to serious water waste and a generally low overall system yield (only 70%-75%). This not only increases water production costs but also exacerbates water consumption, making it difficult to meet the photovoltaic industry's production demands for high efficiency, energy saving, and environmental protection.

[0003] Existing ultrapure water systems suffer from the following main problems: 1. Low concentrate recovery rate: Ultrafiltration concentrate, reverse osmosis concentrate, and EDI concentrate are typically discharged directly or simply reused, lacking an efficient multi-stage recovery mechanism. This leads to a significant waste of recyclable water resources, resulting in a low overall system yield (only 70%-75%). 2. Severe water waste: Due to the ineffective recovery and utilization of concentrate, existing systems generate a large amount of wastewater during operation, increasing water consumption and wastewater treatment costs, making it difficult to meet the requirements of green manufacturing and sustainable development. 3. Limited system yield: Existing processes rely on a single treatment path for concentrate, lacking a flexible multi-stage recovery mechanism. This makes it difficult for the system to achieve efficient water resource utilization when facing changes in water quality and quantity, limiting the improvement of the overall system yield. 4. High operating costs: Low yield and high wastewater discharge directly increase the cost of ultrapure water production, especially given the huge demand for ultrapure water in the photovoltaic industry, further exacerbating production cost pressures. Utility Model Content

[0004] In view of this, the present invention provides a high-utilization ultrapure water system for photovoltaic systems to solve the problem of low recycling rate of ultrapure water for washing hair in the prior art.

[0005] This utility model embodiment provides a high-utilization ultrapure water system for photovoltaic systems, comprising:

[0006] The pretreatment device has its inlet connected to the raw water tank;

[0007] The inlet of the ultrafiltration water tank is connected to the outlet of the pretreatment device.

[0008] A primary pure water treatment device, the inlet of which is connected to the outlet of the ultrafiltration water tank;

[0009] The inlet of the secondary pure water treatment device is connected to the outlet of the primary pure water treatment device.

[0010] The primary pure water treatment unit includes a primary reverse osmosis treatment unit and a primary reverse osmosis water tank, and the secondary pure water treatment unit includes a secondary reverse osmosis treatment unit and a secondary reverse osmosis water tank. The primary pure water treatment unit is connected to the ultrafiltration water tank through a reverse osmosis concentrate recovery unit. The secondary pure water treatment unit is connected to the ultrafiltration water tank through a return pipeline.

[0011] Optionally, the pretreatment device includes a disc filter and an ultrafiltration device.

[0012] Optionally, the raw water tank may be connected to at least one of seawater, freshwater, and reclaimed water.

[0013] Optionally, it also includes:

[0014] The inlet of the ultrafiltration concentrate tank is connected to another outlet of the pretreatment unit.

[0015] The filter device has its inlet connected to the outlet of the ultrafiltration concentrate tank and its outlet connected to the raw water tank.

[0016] The filtration device includes at least one of a quartz sand filter, an activated carbon filter, and a bag filter.

[0017] Optionally, the ultrafiltration membrane of the pretreatment device can be backwashed with filtered water from the ultrafiltration water tank.

[0018] Optionally, it also includes:

[0019] A precision filter is installed between the ultrafiltration water tank and the primary reverse osmosis treatment unit.

[0020] Optionally, the reverse osmosis concentrate recovery device includes: a reverse osmosis concentrate tank and a reverse osmosis recovery treatment device; wherein the reverse osmosis concentrate tank and the reverse osmosis recovery treatment device are sequentially connected between the primary reverse osmosis treatment device and the ultrafiltration tank, and the reverse osmosis recovery treatment device is also connected to the primary reverse osmosis tank and the reverse osmosis ultra-concentrate tank respectively.

[0021] Optionally, it also includes: a tertiary pure water treatment device, located at the rear end of the outlet of the secondary reverse osmosis water tank;

[0022] The tertiary pure water treatment unit consists of a UV sterilizer, an electro-deionization unit, a nitrogen-sealed water tank, a TOC remover, a polishing mixed bed, and a terminal precision filter connected in sequence; the outlet of the terminal precision filter is connected to the point of use. The outlet of the electro-deionization unit is also connected to the inlet of the primary reverse osmosis treatment unit.

[0023] Optionally, the outlet of the terminal precision filter is also connected to the secondary reverse osmosis water tank via an electric valve.

[0024] The beneficial effects of this utility model are:

[0025] This invention provides a high-efficiency ultrapure water system for photovoltaic systems. Through a multi-stage concentrate recovery mechanism, it significantly improves the comprehensive utilization rate of water resources and reduces wastewater discharge. The reverse osmosis recovery system has a high water yield and low operating costs, meeting the photovoltaic industry's demand for efficient, energy-saving, and environmentally friendly ultrapure water systems. Furthermore, it effectively reduces the number of membranes required in the ultrafiltration system, decreasing investment and subsequent maintenance costs. Attached Figure Description

[0026] The features and advantages of this utility model will be more clearly understood by referring to the accompanying drawings. The drawings are schematic and should not be construed as limiting the utility model in any way. In the drawings:

[0027] Figure 1 This invention illustrates a structural block diagram of a high-utilization ultrapure water system for a photovoltaic system according to an embodiment of the present invention.

[0028] Figure 2 A structural block diagram of another high-utilization ultrapure water system for photovoltaic systems is shown in an embodiment of this utility model. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] like Figure 1 and Figure 2As shown in the figure, this utility model embodiment provides a high-utilization ultrapure water system for photovoltaic systems, including: a pretreatment device, an ultrafiltration water tank, a primary pure water treatment device, and a secondary pure water treatment device. The inlet of the pretreatment device is connected to the raw water tank. The inlet of the ultrafiltration water tank is connected to the outlet of the pretreatment device. The inlet of the primary pure water treatment device is connected to the outlet of the ultrafiltration water tank. The inlet of the secondary pure water treatment device is connected to the outlet of the primary pure water treatment device.

[0031] The primary pure water treatment unit includes a primary reverse osmosis treatment unit and a primary reverse osmosis water tank, while the secondary pure water treatment unit includes a secondary reverse osmosis treatment unit and a secondary reverse osmosis water tank. The primary pure water treatment unit is connected to the ultrafiltration water tank via a reverse osmosis concentrate recovery unit. The secondary pure water treatment unit is connected to the ultrafiltration water tank via a return pipeline.

[0032] Reverse osmosis (RO) is the main desalination equipment in the system, removing most ions and impurities from the water. In this embodiment, a two-stage reverse osmosis system is used. The first-stage RO concentrate is collected and treated by a reuse system, automatically or manually switched to either the ultrafiltration tank or the first-stage RO tank based on the permeate conductivity. The second-stage RO concentrate is directly returned to the ultrafiltration tank, achieving staged recycling of the concentrate.

[0033] In a specific embodiment, the reverse osmosis concentrate recovery device includes a reverse osmosis concentrate tank and a reverse osmosis recovery treatment device. The reverse osmosis concentrate tank and the reverse osmosis recovery treatment device are sequentially connected between the primary reverse osmosis treatment device and the ultrafiltration tank. The reverse osmosis recovery treatment device is also connected to both the primary reverse osmosis tank and the reverse osmosis ultra-concentrate tank. Through the RO concentrate recovery treatment system, the RO concentrate undergoes secondary treatment. Qualified permeate enters the primary RO tank, while water with excessive conductivity enters the ultrafiltration tank. The concentrate is collected and pumped to a wastewater treatment plant, significantly improving the yield of the RO system. Through staged recovery and treatment, the yield of the RO system is increased to 70%, significantly reducing wastewater discharge.

[0034] As an optional implementation, the pretreatment device includes a disc filter and an ultrafiltration device.

[0035] Disc filters and ultrafiltration devices are used to remove impurities such as suspended solids, colloids, organic matter, and turbidity from raw water. In this embodiment, dead-end filtration technology is used to improve the yield of the ultrafiltration system (up to 95%).

[0036] As an optional implementation, the raw water tank is connected to at least one of seawater, freshwater, and reclaimed water.

[0037] As an optional implementation, the system also includes an ultrafiltration concentrate tank and a filtration device. The inlet of the ultrafiltration concentrate tank is connected to another outlet of the pretreatment device. The inlet of the filtration device is connected to the outlet of the ultrafiltration concentrate tank, and the outlet of the filtration device is connected to the raw water tank. The filtration device includes at least one of a quartz sand filter, an activated carbon filter, and a bag filter.

[0038] In this embodiment, ultrafiltration concentrate is collected and further treated via an ultrafiltration concentrate tank and filtration device. Qualified product water enters the raw water tank, while unqualified water is discharged into the drainage ditch of the pure water station. Through multi-stage filtration treatment, the recycling rate of ultrafiltration concentrate is significantly improved, reducing water waste.

[0039] As an optional implementation, the ultrafiltration membrane of the pretreatment device is backwashed with filtered water from the ultrafiltration water tank.

[0040] In this embodiment, ultrafiltration backwashing uses water from the ultrafiltration water tank, reducing external water consumption. An ultrafiltration concentrate recovery system is installed to recover the ultrafiltration concentrate and untreated backwash water. This water is then processed through a multi-media filter, a quartz sand filter, and a bag filter before entering the raw water tank, thus improving water resource utilization.

[0041] As an optional implementation, a precision filter is also included, disposed between the ultrafiltration water tank and the primary reverse osmosis treatment unit. Figure 2 As shown, a precision filter (RO SF) is installed in the ultrafiltration water tank and the first-stage reverse osmosis treatment unit.

[0042] As an optional implementation, the system further includes a tertiary pure water treatment unit, located downstream of the outlet of the secondary reverse osmosis water tank. The tertiary pure water treatment unit comprises, in sequence, a UV sterilizer, an electrodeionization (EDI) unit, a nitrogen-sealed water tank, a TOC remover, a polishing mixed bed, and a terminal precision filter; the outlet of the terminal precision filter is connected to the point of use. The outlet of the terminal precision filter is also connected to the secondary reverse osmosis water tank via an electric valve. The outlet of the electrodeionization unit is also connected to the inlet of the primary reverse osmosis treatment unit. An EDI precision filter is also installed between the electrodeionization (EDI) unit and the nitrogen-sealed water tank.

[0043] In this embodiment, the UV germicidal lamp, 0.45μm filter, and EDI device further remove trace ions and impurities from the water to prepare high-purity ultrapure water. A nitrogen-sealed water tank prevents contamination from carbon dioxide and oxygen in the air, ensuring the high purity of the ultrapure water. The EDI concentrate is recycled to the primary RO water tank for reuse, reducing water waste.

[0044] TOC lamps, a primary polishing mixed bed, and a 0.1μm filter are used to ensure that the ultrapure water maintains high purity during transportation, meeting the production requirements of photovoltaic equipment. Specifically, TOC lamps remove organic matter from the water, ensuring that the resistivity of the ultrapure water reaches 18 megohms. In a specific implementation, the outlet of the terminal precision filter is connected to a T-junction pipe. The other two ends of the T-junction pipe are connected to the point of use and the secondary reverse osmosis water tank, respectively, via electric valves. When the return water is unqualified, the electric valve switches to the secondary RO water tank, realizing the recycling of water resources.

[0045] Taking the tap water in Chuzhou, Anhui as an example, the high-utilization-rate ultrapure water system provided in this utility model embodiment was tested. The ultrapure water yield of the system is as follows: ultrafiltration yield 95%, first-stage RO yield 80%, second-stage RO yield 90%, EDI yield 95%, and overall system yield 89%.

[0046] This invention provides a high-efficiency ultrapure water system for photovoltaic systems. Through a multi-stage concentrate recovery mechanism, it significantly improves the comprehensive utilization rate of water resources and reduces wastewater discharge. The reverse osmosis recovery system has a high water yield and low operating costs, meeting the photovoltaic industry's demand for efficient, energy-saving, and environmentally friendly ultrapure water systems. Furthermore, it effectively reduces the number of membranes required in the ultrafiltration system, decreasing investment and subsequent maintenance costs.

[0047] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A high-efficiency ultrapure water system for photovoltaic systems, characterized in that, include: The pretreatment device has its inlet connected to the raw water tank; An ultrafiltration water tank, the inlet of which is connected to the outlet of the pretreatment device; A primary pure water treatment device, the inlet of which is connected to the outlet of the ultrafiltration water tank; A secondary pure water treatment device, the inlet of which is connected to the outlet of the primary pure water treatment device; The primary pure water treatment device includes a primary reverse osmosis treatment device and a primary reverse osmosis water tank, and the secondary pure water treatment device includes a secondary reverse osmosis treatment device and a secondary reverse osmosis water tank; the primary pure water treatment device is connected to the ultrafiltration water tank through a reverse osmosis concentrate recovery device; the secondary pure water treatment device is connected to the ultrafiltration water tank through a return pipe.

2. The high-utilization ultrapure water system for photovoltaic systems according to claim 1, characterized in that, The pretreatment device includes a disc filter and an ultrafiltration device.

3. The high-utilization ultrapure water system for photovoltaic systems according to claim 2, characterized in that, The raw water tank is connected to at least one of seawater, freshwater, and reclaimed water.

4. The high-utilization ultrapure water system for photovoltaic systems according to claim 1, characterized in that, Also includes: The inlet of the ultrafiltration concentrate tank is connected to another outlet of the pretreatment device. The filter device has its inlet connected to the outlet of the ultrafiltration concentrate tank, and its outlet connected to the raw water tank. The filtration device includes at least one of a quartz sand filter, an activated carbon filter, and a bag filter.

5. The high-utilization ultrapure water system for photovoltaic systems according to claim 1, characterized in that, The ultrafiltration membrane of the pretreatment device is backwashed using filtered water from the ultrafiltration water tank.

6. The high-utilization ultrapure water system for photovoltaic systems according to claim 1, characterized in that, Also includes: A precision filter is installed between the ultrafiltration water tank and the primary reverse osmosis treatment unit.

7. The high-utilization ultrapure water system for photovoltaic systems according to claim 1, characterized in that, The reverse osmosis concentrate recovery device includes: a reverse osmosis concentrate tank and a reverse osmosis recovery treatment device; wherein, the reverse osmosis concentrate tank and the reverse osmosis recovery treatment device are sequentially connected between the primary reverse osmosis treatment device and the ultrafiltration tank, and the reverse osmosis recovery treatment device is also connected to the primary reverse osmosis tank and the reverse osmosis ultra-concentrate tank respectively.

8. The high-utilization ultrapure water system for photovoltaic systems according to claim 1, characterized in that, Also includes: A tertiary pure water treatment device is located at the rear end of the outlet of the secondary reverse osmosis water tank; The tertiary pure water treatment device consists of a UV sterilizer, an electro-deionization device, a nitrogen-sealed water tank, a TOC remover, a polishing mixed bed, and a terminal precision filter connected in sequence; the outlet of the terminal precision filter is connected to the point of use; and the outlet of the electro-deionization device is also connected to the inlet of the primary reverse osmosis treatment device.

9. The high-utilization ultrapure water system for photovoltaic systems according to claim 8, characterized in that, The outlet of the terminal precision filter is also connected to the secondary reverse osmosis water tank via an electric valve.

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