Water treatment system for secondary pipe network side

Abstract

The utility model provides a water treatment system for a secondary pipe network side, which comprises a water inlet, a water outlet, and a first-stage filtering cavity, a flow regulating component and a second-stage filtering cavity which are sequentially connected in series from the water inlet to the water outlet between the water inlet and the water outlet, the first-stage filtering cavity is used for filtering particle impurities including rust slag, slime and suspended solids, and the second-stage filtering cavity has at least two treatment functions of antibiosis, scale inhibition and corrosion inhibition; and the water inlet and the water outlet are respectively communicated with a pipeline from the secondary pipe network side to a user side. According to the plate type heat exchanger, particle impurities including rust slag, slime and suspended solids in flowing water in a secondary pipe network side pipeline can be filtered through the first-stage filtering cavity, adhesion in the plate type heat exchanger is effectively reduced, and the heat exchange efficiency of the plate type heat exchanger is improved; and at least two types of water treatments of antibiosis, scale inhibition and corrosion inhibition can be carried out through the second-stage filtering cavity, so that rust slag and microorganisms are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a water treatment system for a secondary pipe network side. Background Art

[0002] The heating method of the heating company is usually to exchange heat between the hot water in the primary pipe network and the water on the secondary pipe network side through a plate heat exchanger located in the heat exchange station in the residential area.

[0003] Among them, the water on the primary pipe network side is the water circulating between the boiler of the heating company and the plate heat exchanger in the residential area heat exchange station. This circulating water generally uses deionized water, and scale and corrosion problems are treated by adding scale inhibitors or corrosion inhibitors.

[0004] The water on the secondary pipe network is the hot water flowing out of the plate heat exchanger in the heat exchange station. It is transported through the secondary pipe network to heating facilities such as radiators or floor heating in users' homes, and then returns to the circulating water of the plate heat exchanger. Tap water or softened soft water is generally used. However, before the heating season, due to the concentrated replenishment of water, it may not be possible to replenish soft water in time. Therefore, tap water is often used for replenishment. This can cause serious scaling, corrosion, and bacterial growth on the secondary pipe network, which in turn leads to a decrease in the heat transfer coefficient of the plate heat exchanger and an increase in energy consumption. Especially in areas with high water hardness and requiring annual cleaning of plate heat exchangers, the scale generated on the secondary pipe network is mixed with corroded rust and then adhered to the plate heat exchanger by microbial slime, making cleaning of the plate heat exchanger more difficult. However, existing equipment systems either lack water treatment devices for the secondary pipe network or provide incomplete water treatment for the secondary pipe network. A comprehensive water treatment system for the secondary pipe network is urgently needed. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a water treatment system for the secondary pipe network side to solve the problems in the existing equipment system, such as the lack of water treatment devices for the secondary pipe network side, or the incomplete water treatment for the secondary pipe network side, and the lack of a comprehensive water treatment system for the secondary pipe network side.

[0006] In order to solve the above technical problems, the technical solution used in this utility model is:

[0007] The utility model discloses a water treatment system for a secondary pipe network, comprising a water inlet and a water outlet, and a first-stage filter cavity, a flow regulating component, and a second-stage filter cavity connected in series between the water inlet and the water outlet in a direction from the water inlet to the water outlet. The first-stage filter cavity is used to filter particulate impurities including rust residue, slime, and suspended matter, and the second-stage filter cavity has at least two treatment functions of antibacterial, scale inhibition, and corrosion inhibition.

[0008] The water inlet and the water outlet are respectively used to communicate with the pipeline flowing from the secondary pipe network side to the user end.

[0009] Preferably, the first-stage filter cavity is a mechanical filter cavity.

[0010] Further preferably, the first-stage filter chamber includes at least one of bag filtration, centrifugal separation, ultrafiltration and sand filtration structures.

[0011] More preferably, when the bag filter structure is provided in the first-stage filter cavity, the corresponding filtration accuracy is 50-200 microns.

[0012] Preferably, the second-stage filter cavity is a solid slow-release cavity, and at least two filter elements selected from the group consisting of a scale-inhibiting filter element, an antibacterial filter element, and a corrosion-inhibiting filter element are arranged in parallel in the cavity.

[0013] Further preferably, the anti-scaling filter element contains at least two anti-scaling filter materials with release rates of 0.01-1 mg / L / hour and 10-100 mg / L / hour respectively.

[0014] Further preferably, the antibacterial components of the antibacterial filter element include fast-dissolving type and slow-dissolving type.

[0015] Further preferably, the corrosion-inhibiting filter element and the scale-inhibiting filter element are integrated, and / or the corrosion-inhibiting component of the corrosion-inhibiting filter element includes at least one of sodium benzotriazole, sodium mercaptobenzothiazole, methylbenzotriazole, oleic acid imidazoline, and carbohydrazide.

[0016] Preferably, the water treatment system further comprises a delivery pump, which is connected in series between the water inlet and the first-stage filter cavity, and the water inlet and the water outlet are respectively connected to the pipeline so that the water treatment system is connected in parallel with the pipeline; or,

[0017] The water inlet is used to communicate with the water outlet of the circulation pump in the pipeline, and the water outlet is used to communicate with the water inlet of the circulation pump.

[0018] Preferably, the flow regulating assembly includes a flow regulating valve and a flow collecting device sequentially connected in series between the water inlet and the water outlet, and the flow regulating valve is closer to the water inlet than the flow collecting device.

[0019] Compared with the prior art, the beneficial effects of the water treatment system for the secondary pipe network side described in the present invention are mainly reflected in:

[0020] After the water treatment system of the utility model is connected with the pipeline flowing to the user end on the secondary pipe network side, the flowing water in the pipeline on the secondary pipe network side can filter out particulate impurities including rust residue, mud and suspended matter when flowing through the first-stage filter cavity, thereby effectively reducing adhesion in the plate heat exchanger, avoiding the decrease in heat transfer coefficient and increase in energy consumption caused by adhesion, thereby improving its heat exchange efficiency. In this way, it can also protect the filter material in the subsequent second-stage filter cavity, preventing the filter material from being attached to impurities in the flowing water and affecting the release efficiency;

[0021] Furthermore, the flowing water in the secondary pipe network side pipeline can also undergo at least two types of water treatment including antibacterial, scale inhibition and corrosion inhibition through the second-stage filter cavity, thereby achieving the purpose of antibacterial, scale inhibition and slowing down pipeline corrosion. Moreover, by slowing down pipeline corrosion, the rust residue and the microorganisms bred thereby can be greatly reduced.

[0022] In this way, the water treatment system provided by the utility model has an integrated comprehensive water treatment capability of filtration, antibacterial, scale inhibition and corrosion inhibition, which can solve the problems in the existing equipment system, such as the lack of water treatment devices for the secondary pipe network side, or the incomplete water treatment for the secondary pipe network side, and the lack of a comprehensive water treatment system for the secondary pipe network side. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other purposes, features and advantages of the present invention will become more apparent through a more detailed description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally scaled to actual size. The emphasis is on illustrating the subject matter of the present invention.

[0024] Figure 1 A schematic diagram of an application pipeline for a water treatment system on the secondary pipe network side provided by an embodiment of the utility model Figure 1 ;

[0025] Figure 2 A schematic diagram of an application pipeline for a water treatment system on the secondary pipe network side provided by an embodiment of the utility model Figure 2 ;

[0026] Description of the drawings: water inlet 1, water outlet 2, first-stage filter chamber 3, second-stage filter chamber 4, pipeline 5 from the secondary pipe network side to the user end, flow regulating valve 6, flow meter 7, plate heat exchanger 8, circulation pump 9, delivery pump 10, pressure gauge 11. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments cited do not limit the present invention. In this embodiment, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention.

[0028] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element. The terms "mounted," "one end," "the other end," and similar expressions used in this utility model are for illustrative purposes only.

[0029] This embodiment provides a water treatment system for the secondary pipe network side, such as Figure 1 and Figure 2 As shown, it includes a water inlet 1 and a water outlet 2, and a first-stage filter chamber 3, a flow regulating component and a second-stage filter chamber 4 connected in series between the water inlet 1 and the water outlet 2 from the water inlet 1 to the water outlet 2. The first-stage filter chamber 3 is used to filter particulate impurities including rust residue, mud and suspended matter, and the second-stage filter chamber 4 has at least two treatment functions of antibacterial, scale inhibition and corrosion inhibition; the water inlet 1 and the water outlet 2 are respectively used to connect with the pipeline 5 flowing from the secondary pipe network side to the user end.

[0030] In this embodiment, the flow regulating assembly includes a flow regulating valve 6 and a flow collection device such as a flow meter 7 that can display real-time flow. The two are sequentially connected in series between the water inlet 1 and the water outlet 2, and the flow regulating valve 6 is closer to the water inlet 1 than the flow collection device. By adjusting the flow regulating valve 6, the purified water flow of the flow collection device can reach the target flow value. The target flow value can be determined based on the water retention of the water treatment system. Generally, the target flow value is selected as 0.5%-5% of the water retention. For example, if the water retention is 200m 3 The clean water flow rate can be set to 1-10m 3 The first-stage filter chamber 3 and the second-stage filter chamber 4 are both tanks.

[0031] Since the water flow in the plate heat exchanger 8 usually has the lowest flow rate in the entire heating system, impurities such as rust residue and slime in the water flow are most likely to adhere to the plate heat exchanger 8. After the water treatment system of this embodiment is connected to the pipeline 5 flowing from the secondary pipe network side to the user end, the flowing water in the pipeline on the secondary pipe network side can filter out particulate impurities including rust residue, slime and suspended matter when flowing through the first-stage filter cavity 3, thereby effectively reducing the adhesion in the plate heat exchanger 8, avoiding the decrease in heat transfer coefficient and increase in energy consumption caused by adhesion, thereby improving heat exchange efficiency. In this way, the filter material in the subsequent second-stage filter cavity 4 can be protected to prevent the filter material from being attached to the impurities in the flowing water and affecting the release efficiency.

[0032] Furthermore, the flowing water in the secondary pipe network side pipeline can also undergo at least two types of water treatment including antibacterial, scale inhibition and corrosion inhibition through the second-stage filter chamber 4, thereby achieving the purpose of antibacterial, scale inhibition and slowing down pipeline corrosion. Moreover, by slowing down pipeline corrosion, the rust residue and the microorganisms bred thereby can be greatly reduced.

[0033] In this way, the water treatment system provided by the utility model has an integrated comprehensive water treatment capability of filtration, antibacterial, scale inhibition and corrosion inhibition, which can solve the problems in the existing equipment system, such as the lack of water treatment devices for the secondary pipe network side, or the incomplete water treatment for the secondary pipe network side, and the lack of a comprehensive water treatment system for the secondary pipe network side.

[0034] In a specific embodiment, the first-stage filter cavity 3 is a mechanical filtration cavity, which includes at least one of bag filtration, centrifugal separation, ultrafiltration and sand filtration structures. In other embodiments, a structural combination of two of these mechanical filtration methods can also be selected.

[0035] Since the bag filter method is a dead-end filter method, that is, it does not discharge wastewater and has a very high pollution holding capacity, it is preferred that a bag filter structure is provided in the first-stage filter cavity 3; further, the bag filter structure corresponds to a filtration accuracy of 50-200 microns; further, as Figure 1 and Figure 2 As shown, the water inlet and outlet 2 of the first-stage filter cavity 3 are each provided with a pressure gauge 11. The pressure difference can be obtained by judging the difference between the two pressure gauges 11. The pressure difference can reflect the fouling condition of the mechanical filter medium. When the pressure difference exceeds 0.1 MPa, it indicates that the filter element needs to be cleaned or replaced to avoid the filter bag from being broken.

[0036] In other embodiments, a centrifugal separation filter structure can be provided in the first-stage filter cavity 3. This filtration method is a continuously operated liquid separation method that separates particulate matter through centrifugal force and discharges it into the sewer with the waste liquid. Its characteristic is that it can be replaced for a long time. The disadvantage is that it wastes some hot water, which in turn leads to energy waste. An ultrafiltration structure can also be provided in the first-stage filter cavity 3. The ultrafiltration filtration method has a high filtration accuracy and can intercept particles larger than 0.1 μm. It uses surface filtration technology to deposit dirt on the surface of the filter membrane. Continuous cross-flow filtration or intermittent flushing can be used to maintain the water flux of the ultrafiltration. Its disadvantage is that it wastes some hot water, and the requirements for hot water on the membrane material are relatively stringent. A sand filtration structure can also be provided in the first-stage filter cavity 3. Sand filtration is a traditional pretreatment method with mature technology and high reliability. Like centrifugal filtration and ultrafiltration, when sand filtration is used, the cavity also needs to be backwashed regularly to remove intercepted impurities.

[0037] In a preferred embodiment, the second-stage filter cavity 4 is a solid slow-release cavity, and at least two filter elements selected from the group consisting of a scale-inhibiting filter element, an antibacterial filter element, and a corrosion-inhibiting filter element are arranged in parallel in the cavity. Among them, the corrosion-inhibiting filter element can be an independent filter element, or it can constitute an integrated filter element with the scale-inhibiting filter element, and at this time, the corrosion-inhibiting component can be formed separately or together with the scale-inhibiting component. Specifically, the corrosion-inhibiting component includes at least one of sodium benzotriazole, sodium mercaptobenzothiazole, methylbenzotriazole, oleic acid imidazoline, and carbohydrazide, or it can be a combination of the above-mentioned multiple components. The corrosion-inhibiting filter element can slow down the corrosion of the pipeline, thereby reducing the rust residue dropped by the corrosion and the large number of microorganisms bred thereby, thereby extending the service life of the pipeline.

[0038] Further preferably, in order to avoid scale generation in the retained water volume in the system, the concentration of the scale inhibitor material in the retained water volume needs to quickly reach the required concentration to ensure the scale inhibition effect, and subsequent water replenishment will cause the concentration of the scale inhibitor material in the water to decrease. For this reason, the scale inhibitor filter element contains at least two types of scale inhibitor filter materials with release rates of 0.01-1 mg / L / hour and 10-100 mg / L / hour, respectively. Among them, the scale inhibitor filter material with a release rate of 10-100 mg / L can be released quickly to meet the scale inhibition needs of the retained water volume in the system, while the scale inhibitor filter material with a release rate of 0.01-1 mg / L will be released slowly to supplement the scale inhibitor material concentration reduced by subsequent water replenishment. Here, a typical method for evaluating the release rate of scale inhibitors is listed: weigh 2g of scale inhibitor material, put it into a 1L beaker, and rinse it three times with pure water, using 2L of water for each rinse; then accurately measure 1L of pure water, pour it into the beaker and let it soak at room temperature. After 10 minutes, pour out 1L of supernatant, shake well, and take 10ml of water sample to test the total phosphorus content.

[0039] In another further preferred embodiment, the antibacterial component of the antibacterial filter element includes a fast-dissolving type and a slow-dissolving type, wherein the fast-dissolving antibacterial component refers to a component that can be completely dissolved within 8 hours after contact with water, and the slow-dissolving antibacterial component refers to a component that releases less than 5 mg / L per hour. As an example, the fast-dissolving antibacterial or bactericidal component can be one or more combinations of isothiazolinones, chlorine dioxide, quaternary ammonium salts, and guanidines, and its form is a tablet. When in contact with water, it can be completely dissolved within one day, or disintegrated into powder and enter the system water; the slow-dissolving antibacterial component can be one or more combinations of zinc pyrithione, sorbic acid, and isothiazolinones, which are mainly used to supplement the decrease in antibacterial component concentration caused by hydration. Of course, in other embodiments, fast-dissolving and slow-dissolving components different from those in this embodiment can also be selected.

[0040] In a specific embodiment, Figure 1 As shown, the water inlet 1 is used to connect with the water outlet of the circulation pump 9 in the pipeline 5 flowing from the secondary pipe network side to the user end, and the water outlet 2 is used to connect with the water inlet of the circulation pump 9, so that the pressure difference between the water inlet and the water outlet of the circulation pump 9 can be used to drive the water flow in the water treatment system of this embodiment.

[0041] In another specific embodiment, Figure 2 As shown, the water treatment system also includes a delivery pump 10, which is connected in series between the water inlet 1 and the first-stage filter chamber 3. The water inlet 1 and the water outlet 2 are respectively connected to the pipeline 5 flowing from the secondary pipe network side to the user end, so that the water treatment system is connected in parallel with the pipeline. In this embodiment, the delivery pump 10 is used as the driving force source for the water flow in the water treatment system. Specifically, the delivery pump 10 is preferably a centrifugal pump.

[0042] In this specification, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] In the description of this specification, the description with reference to the terms "preferred embodiment", "further embodiment", "other embodiments" or "specific example" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A water treatment system for a secondary pipe network, characterized in that: The invention comprises a water inlet and a water outlet, and a first-stage filter cavity, a flow regulating component and a second-stage filter cavity which are sequentially connected in series from the water inlet to the water outlet, wherein the first-stage filter cavity is used to filter particulate impurities including rust residue, slime and suspended matter, and the second-stage filter cavity has at least two treatment functions of antibacterial, scale inhibition and corrosion inhibition; The water inlet and the water outlet are respectively used to communicate with the pipeline flowing from the secondary pipe network side to the user end.

2. A water treatment system for the secondary pipe network side according to claim 1, characterized in that: The first-stage filter cavity is a mechanical filter cavity.

3. A water treatment system for the secondary pipe network side according to claim 2, characterized in that: The first-stage filter chamber includes at least one of bag filtration, centrifugal separation, ultrafiltration and sand filtration structures.

4. A water treatment system for the secondary pipe network side according to claim 3, characterized in that: When the bag filter structure is provided in the first-stage filter cavity, the corresponding filtering accuracy is 50-200 microns.

5. A water treatment system for the secondary pipe network side according to claim 1, characterized in that: The second-stage filter cavity is a solid slow-release cavity, and at least two filter elements selected from the group consisting of a scale-inhibiting filter element, an antibacterial filter element, and a corrosion-inhibiting filter element are arranged in parallel in the cavity.

6. A water treatment system for the secondary pipe network side according to claim 5, characterized in that: The antibacterial components of the antibacterial filter element include fast-dissolving type and slow-dissolving type.

7. A water treatment system for the secondary pipe network side according to claim 5, characterized in that: The corrosion-inhibiting filter element and the scale-inhibiting filter element are integrated.

8. A water treatment system for the secondary pipe network side according to claim 1, characterized in that: The water treatment system further comprises a delivery pump, which is connected in series between the water inlet and the first-stage filter cavity, and the water inlet and the water outlet are respectively connected to the pipeline so that the water treatment system is connected in parallel with the pipeline; or, The water inlet is used to communicate with the water outlet of the circulation pump in the pipeline, and the water outlet is used to communicate with the water inlet of the circulation pump.

9. A water treatment system for the secondary pipe network side according to claim 1, characterized in that: The flow regulating component comprises a flow regulating valve and a flow collecting device which are sequentially connected in series between the water inlet and the water outlet, and the flow regulating valve is closer to the water inlet than the flow collecting device.

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