A constant temperature circulating water treatment system

Abstract

This invention discloses a constant temperature circulating water treatment system, relating to the field of water treatment technology. It includes an ultrafiltration unit and a first heat exchange unit. The output end of the ultrafiltration unit is connected to a reverse osmosis unit, which has two output ends. The first input end of the first heat exchange unit is connected to the output end of a preliminary treatment component. The first output end of the first heat exchange unit is connected to the input end of the ultrafiltration unit. The second input end of the first heat exchange unit is connected to the first output end of the reverse osmosis unit. The second output end of the reverse osmosis unit is connected to a first heat exchange mechanism, and the output end of the ultrafiltration unit is equipped with a second heat exchange mechanism. This invention achieves multi-stage heat exchange through the first, second, and third heat exchange units, realizing the recycling of heat and achieving sustainable energy development and utilization. It also solves the problem of a significant decrease in membrane flux of the ultrafiltration and reverse osmosis units under low temperature environments.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically a constant temperature circulating water treatment system. Background Technology

[0002] Environmental protection generally refers to all actions taken by humankind to solve existing or potential environmental problems, coordinate the relationship between humans and the environment, protect the human living environment, and ensure the sustainable development of the economy and society. In order to prevent the deterioration of the natural environment and protect green mountains, clear waters, blue skies, and the sea, this involves prohibiting illegal logging, indiscriminate discharge of pollutants, overgrazing, excessive land reclamation, overexploitation of natural resources, and disruption of the ecological balance of nature. In urban life, in order to prevent the waste of resources, sewage needs to be recycled, filtered, cleaned, and reused to achieve the goal of saving resources.

[0003] In the process of water recycling, wastewater needs to be treated by ultrafiltration and reverse osmosis. Both ultrafiltration and reverse osmosis are performed through membrane separation. However, in some areas with low temperatures, the flux of ultrafiltration and reverse osmosis membranes decreases significantly due to the low temperature environment, causing ultrafiltration and reverse osmosis to fail to operate. This makes it difficult to recycle water in low-temperature environments.

[0004] Based on this, a constant temperature circulating water treatment system is now provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0005] The purpose of this invention is to provide a constant temperature circulating water treatment system to solve the problem in the prior art that it is not convenient to perform ultrafiltration and reverse osmosis treatment on water in a low temperature environment.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A constant-temperature circulating water treatment system includes an ultrafiltration unit and a first heat exchange unit. The output end of the ultrafiltration unit is connected to a reverse osmosis unit. The reverse osmosis unit has two output ends. The liquid output from the ultrafiltration unit is raw water, the liquid output from the first output end of the reverse osmosis unit is purified water, and the liquid output from the second output end of the reverse osmosis unit is concentrated water. The ultrafiltration unit consists of a booster pump, a membrane housing, and an ultrafiltration membrane. The reverse osmosis unit consists of a booster pump, a membrane housing, and a reverse osmosis membrane. The first input end of the first heat exchange unit is connected to the output end of the preliminary treatment unit. The preliminary treatment component is connected to the first input of the first heat exchange unit via a heating component. The liquid output by the preliminary treatment component is raw water. The first output of the first heat exchange unit is connected to the input of the ultrafiltration unit. The second input of the first heat exchange unit is connected to the first output of the reverse osmosis unit. The second output of the reverse osmosis unit is connected to a first heat exchange mechanism for transferring and cooling the concentrate temperature. The input of the ultrafiltration unit and the first output of the first heat exchange unit are connected to a second heat exchange mechanism for raising the temperature of the raw water inside the ultrafiltration unit.

[0008] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0009] In one alternative: the first heat exchange mechanism includes a second heat exchange unit, the second output end of the reverse osmosis unit is connected to the first input end of the second heat exchange unit, the first output end of the second heat exchange unit is connected to a first drain pipe, the second output end of the first heat exchange unit is connected to a first output branch and a second output branch, and the first output branch is connected to the second input end of the second heat exchange unit.

[0010] In one alternative: the second heat exchange mechanism includes a third heat exchange unit, the first input end of the third heat exchange unit is connected to the first output end of the first heat exchange unit, the first output end of the third heat exchange unit is connected to the input end of the ultrafiltration unit, the second output end and the second output branch of the second heat exchange unit are both connected to the second input end of the third heat exchange unit, and a second drain pipe is connected to the second output end of the third heat exchange unit.

[0011] In one alternative: the input and output ends of the ultrafiltration unit, reverse osmosis unit, first heat exchange unit, second heat exchange unit and third heat exchange unit are all equipped with pressure pumps.

[0012] In one alternative: the first heat exchange unit and the second heat exchange unit are one or more of plate heat exchangers and tubular heat exchangers.

[0013] In one alternative: the third heat exchange unit is one or more of the following: a coupler with added antifreeze ethylene glycol and a water source heat pump, or a coupler with added antifreeze ethylene glycol and an air source heat pump.

[0014] In one alternative: the purified water flow rate at the second output end of the first heat exchange unit is equal to the sum of the purified water flow rates at the first output branch and the second output branch; the raw water flow rate at the output end of the ultrafiltration unit is equal to the sum of the purified water flow rate at the first output end and the concentrated water flow rate at the second output end of the reverse osmosis unit; and the purified water flow rate at the first output branch is equal to the concentrated water flow rate at the first input end of the second heat exchange unit.

[0015] In one alternative: the raw water temperature at the first output terminal of the first heat exchange unit is greater than the raw water temperature at the first input terminal of the first heat exchange unit; the raw water temperature at the first input terminal of the third heat exchange unit is less than the raw water temperature at the input terminal of the ultrafiltration unit; the purified water temperature at the second input terminal of the first heat exchange unit is greater than the purified water temperature at the second output terminal of the first heat exchange unit; the purified water temperature at the second input terminal of the second heat exchange unit is less than the purified water temperature at the second output terminal of the second heat exchange unit; the concentrate temperature at the first input terminal of the second heat exchange unit is greater than the concentrate temperature at the first output terminal of the second heat exchange unit; and the purified water temperature at the second input terminal of the third heat exchange unit is greater than the purified water temperature at the output terminal of the third heat exchange unit.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention achieves the recycling of heat through multi-stage heat exchange via a first heat exchange unit, a second heat exchange unit, and a third heat exchange unit, thus realizing the sustainable development and utilization of energy. It solves the problem that in most parts of China, the membrane flux of ultrafiltration and reverse osmosis units decreases significantly under low temperature conditions, causing ultrafiltration and reverse osmosis systems to fail to operate. At the same time, it ensures the stable operation of the water treatment system and achieves low cost and high energy efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure labeling notes: 11 Ultrafiltration unit, 12 Reverse osmosis unit, 13 First heat exchange unit, 14 Second heat exchange unit, 15 Third heat exchange unit. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] In one embodiment, such as Figure 1As shown, a constant temperature circulating water treatment system includes an ultrafiltration unit 11 and a first heat exchange unit 13. The output end of the ultrafiltration unit 11 is connected to a reverse osmosis unit 12. The reverse osmosis unit 12 has two output ends. The liquid output from the ultrafiltration unit 11 is raw water, the liquid output from the first output end of the reverse osmosis unit 12 is purified water, and the liquid output from the second output end of the reverse osmosis unit 12 is concentrated water. The ultrafiltration unit 11 consists of a booster pump, a membrane housing, and an ultrafiltration membrane. The reverse osmosis unit 12 consists of a booster pump, a membrane housing, and a reverse osmosis membrane. The first input end of the first heat exchange unit 13 is connected to the output end of a preliminary treatment component. A heating component is connected between the output end of the preliminary treatment component and the first input end of the first heat exchange unit 13. The output liquid of the first processing unit is raw water. The first output end of the first heat exchange unit 13 is connected to the input end of the ultrafiltration unit 11, and the second input end of the first heat exchange unit 13 is connected to the first output end of the reverse osmosis unit 12. The second output end of the reverse osmosis unit 12 is connected to a first heat exchange mechanism for transferring and cooling the temperature of the concentrate. A second heat exchange mechanism for raising the temperature of the raw water inside the ultrafiltration unit 11 is provided between the input end of the ultrafiltration unit 11 and the first output end of the first heat exchange unit 13. The first heat exchange mechanism facilitates the transfer of the internal temperature of the concentrate, thereby facilitating the cooling of the concentrate. The second heat exchange mechanism facilitates the raising of the temperature of the raw water entering the ultrafiltration unit 11, thereby preventing the membrane permeation of the ultrafiltration unit 11 and the reverse osmosis unit 12 from decreasing.

[0022] The first heat exchange mechanism includes a second heat exchange unit 14. The second output end of the reverse osmosis unit 12 is connected to the first input end of the second heat exchange unit 14. The first output end of the second heat exchange unit 14 is connected to a first drain pipe. The second output end of the first heat exchange unit 13 is connected to a first output branch and a second output branch. The first output branch is connected to the second input end of the second heat exchange unit 14. The raw water flow rate at the first input end of the first heat exchange unit 13 is Q m³ / h, and the temperature is T1℃. The raw water flow rate at the first output end of the first heat exchange unit 13 is Q m³ / h, and the temperature is T2℃. The first output end of the reverse osmosis unit 12... The output end of the reverse osmosis unit 12 has a purified water flow rate of Q2 m³ / h and a temperature of T4℃. The second output end of the reverse osmosis unit 12 has a concentrated water flow rate of Q4 m³ / h and a temperature of T4℃. The second output end of the first heat exchange unit 13 has a purified water flow rate of Q2 m³ / h and a temperature of T5℃. The first output branch has a purified water flow rate of Q1 m³ / h and a temperature of T5℃. The second output branch has a purified water flow rate of Q3 m³ / h and a temperature of T5℃. The first output end of the second heat exchange unit 14 has a concentrated water flow rate of Q4 m³ / h and a temperature of T9℃. The second output end of the second heat exchange unit 14 has a purified water flow rate of Q1 m³ / h and a temperature of T6℃.

[0023] The second heat exchange mechanism includes a third heat exchange unit 15. The first input end of the third heat exchange unit 15 is connected to the first output end of the first heat exchange unit 13. The first output end of the third heat exchange unit 15 is connected to the input end of the ultrafiltration unit 11. The second output end and the second output branch of the second heat exchange unit 14 are both connected to the second input end of the third heat exchange unit 15. A second drain pipe is connected to the second output end of the third heat exchange unit 15. The flow rate of the first input end of the third heat exchange unit 15 is Qm³ / h and the temperature is T2℃. The flow rate of the first output end of the third heat exchange unit 15 is Qm³ / h and the temperature is T3℃. The flow rate of the second input end of the third heat exchange unit 15 is Q2m³ / h and the temperature is T7℃. The flow rate of the second output end of the third heat exchange unit 15 is Q2m³ / h and the temperature is T8℃. The flow rate of the input end of the reverse osmosis unit 12 is Qm³ / h and the temperature is T3℃.

[0024] When water treatment is required, raw water is supplied to the first heat exchange unit 13 through the first input terminal of the first heat exchange unit 13 via the preliminary treatment component, and heated by the heating component. Simultaneously, the reverse osmosis unit 12 supplies purified water to the first heat exchange unit 13 through the second input terminal of the first heat exchange unit 13 via its first output terminal, allowing heat exchange between the raw water and purified water. During this process, the temperature of the raw water inside the first heat exchange unit 13 increases, while the temperature of the purified water decreases. At the same time, the reverse osmosis unit 12 supplies concentrated water to the second heat exchange unit 14 through the first input terminal of the second heat exchange unit 14 via its second output terminal. The first heat exchange unit 13 supplies purified water to the second heat exchange unit 14 through the first output branch and the second input terminal of the second heat exchange unit 14. Internal heat exchange occurs, during which the temperature of the concentrate decreases, and it is then directly discharged through the first drain pipe. Subsequently, the purified water from the second output end of the second heat exchange unit 14 and the second branch enters the third heat exchange unit 15 through the second input end. The raw water from the first output end of the first heat exchange unit 13 enters the third heat exchange unit 15 through the first input end for heat exchange. The heated raw water then enters the ultrafiltration unit 11 through the first output end of the third heat exchange unit 15. After ultrafiltration in the ultrafiltration unit 11, the raw water enters the reverse osmosis unit 12 for reverse osmosis, thus forming a water circulation system. At the same time, the purified water cooled in the third heat exchange unit 15 is directly supplied to the user through the second drain pipe.

[0025] The ultrafiltration unit 11, reverse osmosis unit 12, first heat exchange unit 13, second heat exchange unit 14 and third heat exchange unit 15 are all equipped with pressure pumps at their input and output ends, which facilitates better liquid transfer during use.

[0026] The first heat exchange unit 13 and the second heat exchange unit 14 are one or more of plate heat exchangers and tubular heat exchangers. Different types of heat exchangers can be selected according to the usage requirements.

[0027] The third heat exchange unit 15 is one or more of the following: a coupler with added antifreeze ethylene glycol and a water source heat pump, or a coupler with added antifreeze ethylene glycol and an air source heat pump. The appropriate coupler can be selected based on the actual application.

[0028] The purified water flow rate Q2m³ / h at the second output end of the first heat exchange unit 13 is equal to the sum of the purified water flow rate Q1m³ / h at the first output branch and the purified water flow rate Q3m³ / h at the second output branch. The raw water flow rate Q at the output end of the ultrafiltration unit 11 is equal to the sum of the purified water flow rate Q2m³ / h at the first output end and the concentrated water flow rate Q4m³ / h at the second output end of the reverse osmosis unit 12. The purified water flow rate Q1m³ / h at the first output branch is equal to the concentrated water flow rate Q4m³ / h at the first input end of the second heat exchange unit 14.

[0029] The raw water temperature T2℃ at the first output terminal of the first heat exchange unit 13 is greater than the raw water temperature T1℃ at the first input terminal of the first heat exchange unit 13. The raw water temperature T2℃ at the first input terminal of the third heat exchange unit 15 is less than the raw water temperature T3℃ at the input terminal of the ultrafiltration unit 11. The purified water temperature T4℃ at the second input terminal of the first heat exchange unit 13 is greater than the purified water temperature T5℃ at the second output terminal of the first heat exchange unit 13. The purified water temperature T5℃ at the second input terminal of the second heat exchange unit 14 is less than the purified water temperature T6℃ at the second output terminal of the second heat exchange unit 14. The concentrated water temperature T4℃ at the first input terminal of the second heat exchange unit 14 is greater than the concentrated water temperature T9℃ at the first output terminal of the second heat exchange unit 14. The purified water temperature T7℃ at the second input terminal of the third heat exchange unit 15 is greater than the purified water temperature T8℃ at the output terminal of the third heat exchange unit 15.

[0030] The above embodiment discloses a constant temperature circulating water treatment system. When water treatment is required, raw water is transported to the first heat exchange unit 13 through the first input terminal of the first heat exchange unit 13 via a preliminary treatment component. The raw water is then heated to T1℃ by a heating component. Simultaneously, the reverse osmosis unit 12 delivers purified water to the first heat exchange unit 13 through the second input terminal of the first heat exchange unit 13 via its first output terminal, allowing heat exchange between the raw water and purified water. During this process, the temperature of the raw water inside the first heat exchange unit 13 rises to T2℃, while the temperature of the purified water decreases to T5℃. Simultaneously, the second output terminal of the reverse osmosis unit 12 delivers concentrated water to the second heat exchange unit 14 through the first input terminal of the second heat exchange unit 14. The second output terminal of the first heat exchange unit 13 delivers purified water through the first output branch and the second input branch of the second heat exchange unit 14. The water is delivered to the second heat exchange unit 14 for heat exchange. During this process, the concentrated water temperature drops to T9℃ and is then discharged directly through the first drain pipe. Subsequently, the purified water from the second output end and the second branch of the second heat exchange unit 14 enters the third heat exchange unit 15 through the second input end. The raw water from the first output end of the first heat exchange unit 13 enters the third heat exchange unit 15 through the first input end for heat exchange. After being heated to T3℃, the raw water enters the ultrafiltration unit 11 through the first output end of the third heat exchange unit 15. After ultrafiltration in the ultrafiltration unit 11, the raw water enters the reverse osmosis unit 12 for reverse osmosis, thus forming a water circulation system. At the same time, the purified water in the third heat exchange unit 15, cooled to T8℃, is directly supplied to the user through the second drain pipe.

[0031] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A constant temperature circulating water treatment system, comprising an ultrafiltration unit (11) and a first heat exchange unit (13), wherein the output end of the ultrafiltration unit (11) is connected to a reverse osmosis unit (12), and the reverse osmosis unit (12) is connected to two output ends, wherein the liquid output from the ultrafiltration unit (11) is raw water, the liquid output from the first output end of the reverse osmosis unit (12) is purified water, and the liquid output from the second output end of the reverse osmosis unit (12) is concentrated water, wherein the ultrafiltration unit (11) is composed of a booster pump, a membrane housing, and an ultrafiltration membrane, and the reverse osmosis unit (12) is composed of a booster pump, a membrane housing, and a reverse osmosis membrane, characterized in that, The first input end of the first heat exchange unit (13) is connected to the output end of the preliminary treatment component. A heating component is provided between the output end of the preliminary treatment component and the first input end of the first heat exchange unit (13). The liquid output by the preliminary treatment component is raw water. The first output end of the first heat exchange unit (13) is connected to the input end of the ultrafiltration unit (11). The second input end of the first heat exchange unit (13) is connected to the first output end of the reverse osmosis unit (12). A first heat exchange mechanism for transferring and cooling the concentrated water temperature is provided between the input end of the ultrafiltration unit (11) and the first output end of the first heat exchange unit (13). A second heat exchange mechanism for raising the temperature of the raw water inside the ultrafiltration unit (11) is provided between the input end of the ultrafiltration unit (11) and the first output end of the first heat exchange unit (13). The first heat exchange mechanism includes a second heat exchange unit (14), the second output end of the reverse osmosis unit (12) is connected to the first input end of the second heat exchange unit (14), the first output end of the second heat exchange unit (14) is connected to a first drain pipe, the second output end of the first heat exchange unit (13) is connected to a first output branch and a second output branch, and the first output branch is connected to the second input end of the second heat exchange unit (14). The second heat exchange mechanism includes a third heat exchange unit (15). The first input end of the third heat exchange unit (15) is connected to the first output end of the first heat exchange unit (13). The first output end of the third heat exchange unit (15) is connected to the input end of the ultrafiltration unit (11). The second output end and the second output branch of the second heat exchange unit (14) are both connected to the second input end of the third heat exchange unit (15). A second drain pipe is connected to the second output end of the third heat exchange unit (15).

2. The constant temperature circulating water treatment system according to claim 1, characterized in that, The ultrafiltration unit (11), reverse osmosis unit (12), first heat exchange unit (13), second heat exchange unit (14) and third heat exchange unit (15) are all equipped with pressure pumps at their input and output ends.

3. The constant temperature circulating water treatment system according to claim 1, characterized in that, The first heat exchange unit (13) and the second heat exchange unit (14) are one or more of plate heat exchangers and tubular heat exchangers.

4. The constant temperature circulating water treatment system according to claim 1, characterized in that, The third heat exchange unit (15) is one or more of the following: a coupler with added antifreeze ethylene glycol and a water source heat pump, or a coupler with added antifreeze ethylene glycol and an air source heat pump.

5. The constant temperature circulating water treatment system according to claim 1, characterized in that, The purified water flow rate at the second output end of the first heat exchange unit (13) is equal to the sum of the purified water flow rate at the first output branch and the purified water flow rate at the second output branch. The raw water flow rate at the output end of the ultrafiltration unit (11) is equal to the sum of the purified water flow rate at the first output end and the concentrated water flow rate at the second output end of the reverse osmosis unit (12). The purified water flow rate at the first output branch is equal to the concentrated water flow rate at the first input end of the second heat exchange unit (14).

6. The constant temperature circulating water treatment system according to claim 1, characterized in that, The raw water temperature at the first output end of the first heat exchange unit (13) is greater than the raw water temperature at the first input end of the first heat exchange unit (13). The raw water temperature at the first input end of the third heat exchange unit (15) is less than the raw water temperature at the input end of the ultrafiltration unit (11). The purified water temperature at the second input end of the first heat exchange unit (13) is greater than the purified water temperature at the second output end of the first heat exchange unit (13). The purified water temperature at the second input end of the second heat exchange unit (14) is less than the purified water temperature at the second output end of the second heat exchange unit (14). The concentrated water temperature at the first input end of the second heat exchange unit (14) is greater than the concentrated water temperature at the first output end of the second heat exchange unit (14). The purified water temperature at the second input end of the third heat exchange unit (15) is greater than the purified water temperature at the output end of the third heat exchange unit (15).

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