A multifunctional corrosion inhibitor with pipe cleaning effect and method of use

Abstract

The application provides a multifunctional corrosion inhibitor with a pipeline dredging function and a use method, wherein the corrosion inhibitor comprises the following components in percentage by weight: a carbon steel corrosion inhibitor 10-30%; sodium silicate 10-20%, an azole compound 1-10%, sodium hydroxide 1-10%, and the balance is water. During heating, the corrosion inhibitor with a stripping function is added into a heat supply pipeline network, and a bypass filtering device is installed in the heat supply pipeline network to clean out the corrosion products stripped out, and the corrosion inhibitor for dredging the heat supply pipeline disclosed by the application not only can slow down the corrosion rate of the heat supply pipeline, i.e. the carbon steel pipeline, but also has a stripping function on the corrosion products and scale on the inner wall of the pipeline.

Description

Technical Field

[0001] This application relates to the field of water treatment technology for heating pipe networks, and in particular to a corrosion inhibitor, unblocking device, and method for unblocking heating pipes. Background Technology

[0002] Heating networks transfer heat from heating units to residents' homes, serving as a crucial facility for ensuring heating during winter. Some older heating networks have been in use for over 20 years, and issues such as scale buildup and corrosion products on the inner walls of the pipes have reduced their diameter, hindering water flow. Even when heating companies increase the water temperature, residents' homes still don't reach the required temperature, severely impacting heating efficiency and causing conflicts between heating companies and users. Completely replacing these pipe sections would incur significant maintenance costs.

[0003] With the development of heating technology, scale and corrosion inhibitors are generally added to the circulating water of heating networks to slow down the corrosion rate of pipes. However, for pipes with a large amount of corrosion products and scale buildup on the inner walls, the corrosion inhibitors only act on the surface of the rust layer and cannot provide the original protective effect. Moreover, existing corrosion inhibitor products do not have the function of removing corrosion products or unclogging pipes. Common pipe cleaners are usually acids or other surfactants. Although they can remove corrosion products and scale from inside the pipes, they can accelerate corrosion and even cause leaks in areas not covered by corrosion products. The wastewater and waste acid generated by cleaning with acids or pipe cleaners cannot be discharged. Using acids to clean pipes can only be done during the non-heating season, requiring pump circulation, and generating a large amount of wastewater and waste acid, which is also very difficult to discharge.

[0004] The accumulation of scale and corrosion products on the inner walls of aging heating pipe networks leads to a reduction in the inner diameter of the pipes, resulting in poor water flow in the heating network and seriously affecting the heating effect. Currently, there are no corrosion inhibitors or corresponding removal methods for the scale buildup on the inner walls of these aging heating pipe networks. Summary of the Invention

[0005] This application aims to at least partially solve one of the technical problems in the related art. This application proposes a corrosion inhibitor, a dredging device, and a method for unclogging heating pipes. During the heating season, a corrosion inhibitor with a peeling function is added, and a bypass filter device is installed in the heating pipe network to remove the peeled corrosion products.

[0006] According to the first aspect of this application, a corrosion inhibitor for unclogging heating pipes is provided, comprising the following components by weight percentage: 10%-30% carbon steel corrosion inhibitor; 10-20% sodium silicate; 1-10% azole compound; 1-10% sodium hydroxide; and the balance being water.

[0007] In some embodiments, the corrosion inhibitor comprises the following components by weight percentage: 15%-25% carbon steel corrosion inhibitor; 12%-20% sodium silicate; 2%-5% azole compound; 2%-8% sodium hydroxide; and the balance being water.

[0008] In some embodiments, the carbon steel corrosion inhibitor is an inorganic corrosion inhibitor, including phosphate corrosion inhibitors.

[0009] In some embodiments, the phosphate corrosion inhibitor is sodium hexametaphosphate.

[0010] In some embodiments, the azole compound is toluenetriazole, benzotriazole, or 2-mercaptobenzothiazole.

[0011] In some embodiments, a corrosion inhibitor dosing and unblocking device is provided according to the second aspect of this application, for adding the corrosion inhibitor described in any of the above embodiments to a heating pipe network for unblocking, including...

[0012] A dosing device, which is connected to the heating network and adds a set dose of the corrosion inhibitor to the heating network;

[0013] The filtration and decontamination device includes a cyclone separator and a tubular filter connected in parallel with the heating network, respectively; the cyclone separator is used to remove suspended solids in the heating network water; the tubular filter is used to remove corrosion products from the heating network water.

[0014] According to a third aspect of this application, a method for unblocking aging heating pipe networks is proposed, which utilizes the chemical dosing unblocking device described in any of the above embodiments for unblocking; including:

[0015] Connect the chemical dosing and unblocking device to the heating pipeline network;

[0016] The corrosion inhibitor, at a predetermined dosage, is administered to the heating pipeline network through the dosing device in the dosing and unblocking device. The dosage of the corrosion inhibitor is 500-1000 mg / L.

[0017] After the heating network water containing the corrosion inhibitor has circulated for a set time, the filter and decontamination device in the chemical dosing and unblocking device is turned on to discharge the deposits in the heating network.

[0018] In some embodiments, after the heating network water containing the corrosion inhibitor has been circulated for 48-50 hours, the chemical dosing and unblocking device is turned on.

[0019] In some embodiments, when the chemical dosing and unblocking device is turned on, the cyclone separator is first turned on to remove solid suspended matter in the heating network water, and then the tubular filter is turned on to remove corrosion products in the heating network water.

[0020] In some embodiments, when the chemical dosing and unblocking device is turned on, all the heating network water in the heating pipeline enters the cyclone separator or the tubular filter through a bypass.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 This is a schematic diagram of a corrosion inhibitor dosing and unblocking device according to an embodiment of this application;

[0024] Figure 2 This is a flowchart of a method for unblocking an old heating pipe network according to an embodiment of this application;

[0025] In the diagram: 1. Dosing device; 2. Cyclone separator; 3. Tubular filter; 4. Valve F; 5. Valve D; 6. Valve E; 7. Valve C; 8. Valve A; 9. Valve B; 10. Circulation pump. Detailed Implementation

[0026] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0027] Examples of this application are described in detail below, with examples shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The examples described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0028] According to the first aspect of this application, a corrosion inhibitor for unclogging heating pipes is provided, comprising the following components by weight percentage: 10%-30% carbon steel corrosion inhibitor; 10-20% sodium silicate; 1-10% azole compound; 1-10% sodium hydroxide; and the balance being water.

[0029] This embodiment proposes a corrosion inhibitor for unclogging heating pipes, comprising 10%-30% by weight of carbon steel corrosion inhibitor; in other words, the weight of carbon steel corrosion inhibitor in the corrosion inhibitor is 10%-30% of the total weight of the corrosion inhibitor. Examples of carbon steel corrosion inhibitor weights are 10%, 15%, 20%, 25%, and 30% of the total weight of the corrosion inhibitor, or any value within this range. When the weight percentage of carbon steel corrosion inhibitor is low, such as below 10%, a good corrosion inhibition effect cannot be achieved; when the weight percentage of carbon steel corrosion inhibitor is high, such as above 30%, the corrosion inhibition efficiency cannot be further improved, and increasing the proportion of corrosion inhibitor is relatively wasteful. The carbon steel corrosion inhibitor is an inorganic corrosion inhibitor, including phosphate corrosion inhibitors, such as sodium hexametaphosphate. Sodium hexametaphosphate is a corrosion inhibitor for carbon steel. It promotes the conversion of corrosion products γ-FeOOH to α-FeOOH in carbon steel heating network pipes. α-FeOOH is denser and more stable than γ-FeOOH, providing a certain degree of protection to carbon steel. Furthermore, the different densities of various crystalline corrosion products in carbon steel lead to volume changes during the crystal transformation process, causing corrosion products to detach from the inner wall of the carbon steel pipes, thus clearing blockages. Further, based on the corrosion inhibitor's specifications, the weight percentage of the carbon steel corrosion inhibitor is 15%-25%.

[0030] In this embodiment, the corrosion inhibitor comprises 10-20% sodium silicate by weight; in other words, the weight of sodium silicate in the corrosion inhibitor is 10-20% of the total weight of the corrosion inhibitor. Examples of sodium silicate weight include 10%, 12%, 15%, 18%, 20%, or any value within a range thereof. When the sodium silicate weight percentage is low, such as below 10%, a good corrosion inhibition effect cannot be achieved; when the sodium silicate weight percentage is high, such as above 20%, the corrosion inhibition efficiency cannot be further improved, and increasing the proportion of corrosion inhibitor is relatively wasteful. Further, based on the corrosion inhibitor, the weight percentage of sodium silicate is 12-20%.

[0031] In this embodiment, the corrosion inhibitor includes 1-10% by weight of azole compounds, for example, toluenetriazole, benzotriazole, or 2-mercaptobenzothiazole; in other words, the weight of azole compounds in the corrosion inhibitor is 1-10% of the total weight of the corrosion inhibitor. For example, the weight of azole compounds is 1%, 2%, 5%, 8%, 10% of the total weight of the corrosion inhibitor, or any value within the range thereof. When the weight percentage of azole compounds is low, such as below 1%, a good corrosion inhibition effect cannot be achieved; when the weight percentage of azole compounds is high, such as above 10%, the corrosion inhibition efficiency cannot be further improved, and increasing the proportion of corrosion inhibitor is relatively wasteful. Furthermore, based on the corrosion inhibitor, the weight percentage of azole compounds is 2-5%.

[0032] The corrosion inhibitor component of this application contains sodium silicate and azole compounds, which have a synergistic effect on the corrosion inhibition of carbon steel and can play a role in the corrosion inhibition of carbon steel pipelines.

[0033] In this embodiment, the corrosion inhibitor includes 1-10% sodium hydroxide by weight; in other words, the weight of sodium hydroxide in the corrosion inhibitor is 1-10% of the total weight of the corrosion inhibitor. Examples of sodium hydroxide weight are 1%, 2%, 5%, 8%, 10% of the total weight of the corrosion inhibitor, or any value within this range. When the sodium hydroxide weight percentage is low, such as below 1%, the pH value is low; when the sodium hydroxide weight percentage is high, such as above 10%, the pH value is high. Further, based on the corrosion inhibitor, the weight percentage of sodium hydroxide is 2-8%.

[0034] In summary, the corrosion inhibitor for unclogging heating pipes disclosed in this embodiment can not only slow down the corrosion rate of heating pipes, i.e., carbon steel pipes, but also has the function of peeling off corrosion products and scale on the inner wall of the pipe.

[0035] According to the second aspect of this application, a corrosion inhibitor dosing and unblocking device is provided, such as... Figure 1 As shown, a device for adding corrosion inhibitors from any of the above embodiments to a heating pipe network for unblocking includes a dosing device 1 and a filtration and decontamination device.

[0036] The dosing device 1 is connected to the heating pipe network and adds a predetermined dose of corrosion inhibitor to the network. The dosing device 1 can be understood as a dosing tank and a metering pump. The dosing tank contains the corrosion inhibitor described in the previous embodiment. The metering pump has a flow rate of 200 L / h and is connected to the heating pipe network. When the heating pipe network needs to be cleaned and dredged, a predetermined dose of corrosion inhibitor is added to it. The corrosion inhibitor in this application is added to the heating pipe network via a metering pump in an impact manner. This rapid addition rate quickly changes the water quality within the heating pipe network. The rapid change in water quality causes corrosion products from the inner wall of the pipe to detach and enter the water, thus clearing the inner wall of the heating pipe network.

[0037] The filtration and decontamination device includes a cyclone separator 2 and a tubular filter 3 connected in parallel with the heating network. The cyclone separator 2 is used to remove solid suspended matter in the heating network water. The tubular filter 3 is used to remove corrosion products in the heating network water.

[0038] In other words, the filtration and decontamination device includes a cyclone separator 2 and a tubular filter 3, both of which are commercially available components commonly used in the field, and their working principles will not be described in detail. In this embodiment, both the cyclone separator 2 and the tubular filter 3 are connected in parallel to the heating network. When the filtration and decontamination device is started, the heating network water in the heating network passes through the cyclone separator 2 and the tubular filter 3, removing large solid suspended matter and smaller iron corrosion products.

[0039] like Figure 1 As shown, the in-line filter 3 and the cyclone separator 2 are connected in parallel to the heating network via bypasses, and a circulating pump 10 for circulating the heating network water is installed on the heating network. The flow direction of the heating network is as follows. Figure 1 The direction is indicated by the middle arrow. The inlet and outlet of both the tubular filter 3 and the cyclone separator 2 are connected to the heating pipeline network. The inlet and outlet of the cyclone separator 2 are respectively equipped with valves A8 and B9; the input end of valve A8 and the output end of valve B9 are both connected to the heating pipeline network, and valve C7 is installed on this section of the heating pipeline network. The parallel connection method of the tubular filter 3 to the heating pipeline network is exactly the same as that of the cyclone separator 2, i.e., the inlet and outlet of the tubular filter 3 are respectively equipped with valves D5 and E6; the input end of valve D5 and the output end of valve E6 are both connected to the heating pipeline network, and valve F4 is installed on this section of the heating pipeline network. When the cyclone separator 2 is activated, valves A8 and B9 are opened, and valve C7 is closed. At this time, the heating network water in the heating pipeline network flows through the cyclone separator 2, removing large pieces of suspended solids. When the tubular filter 3 is activated, valves D5 and E6 are opened and valve F4 is closed. At this time, the heating network water in the heating network flows through the cyclone separator 2 to remove the corrosion products of iron with smaller particle size. Therefore, this application can remove the corrosion products and dirt that fall off the inner wall of the heating network from the heating network water during the heating process, and finally achieve the purpose of discharging the deposits on the inner wall of the pipe from the system, and avoid the re-deposition of dirt on the inner wall of the heating network.

[0040] According to the third aspect of this application, a method for unblocking aging heating pipe networks is proposed, such as... Figure 2 As shown, unblocking is performed using the chemical dosing device in any of the above embodiments; including:

[0041] S1: Connect a chemical dosing and unblocking device to the heating pipeline network;

[0042] S2: The prescribed dosage of corrosion inhibitor is delivered to the heating pipeline through the dosing device 1 in the dosing and unblocking device. The dosage of corrosion inhibitor is 500-1000 mg / L.

[0043] S3: After the heating network water containing dissolved corrosion inhibitors has circulated for a set time, turn on the filter and decontamination device in the dosing and unblocking device to discharge the deposits in the heating network.

[0044] In S1, during the start-up phase of the heating season, a chemical dosing and unblocking device is connected to the heating pipeline. The cyclone separator 2, tubular filter 3, circulating pump 10, as well as the dosing tank and dosage pump in the chemical dosing and unblocking device are connected to the heating pipeline in accordance with the connection method in the above embodiment.

[0045] In step S2, the prepared corrosion inhibitor is first added to the heating network through the dosing tank. The heating network water containing the corrosion inhibitor is circulated in the heating network by the operation of the circulation pump 10. The dosage of the corrosion inhibitor is 500-1000 mg / L, for example, the dosage of the corrosion inhibitor is 500 mg / L, 600 mg / L, 700 mg / L, 800 mg / L, 1000 mg / L, etc.

[0046] In S3, after the heating network water containing dissolved corrosion inhibitor circulates for 48-50 hours, the chemical dosing and unblocking device is activated. When activating the chemical dosing and unblocking device, the cyclone separator 2 is activated first, and all the heating network water in the heating network enters the cyclone separator 2 through a bypass to remove solid suspended matter in the heating network water. Then, the tubular filter 3 is activated, and at this time, all the heating network water in the heating network enters the cyclone separator 2 through a bypass to remove corrosion products in the heating network water.

[0047] Example 1

[0048] A corrosion inhibitor for unclogging heating pipes, comprising the following components by weight percentage: 30% sodium hexametaphosphate; 20% sodium silicate; 10% toluenetriazole; 10% sodium hydroxide; and the balance being water.

[0049] In Examples 2-5, the components of the corrosion inhibitor were adjusted according to the values ​​in Table 1, with the weight percentages of carbon steel corrosion inhibitor, sodium silicate, azole compound, and sodium hydroxide adjusted accordingly.

[0050] Table 1. Composition of corrosion inhibitors in Examples 2-5

[0051]

[0052]

[0053] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0054] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0055] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for dredging old heating pipe network, characterized in that, a dosing dredging device is connected to the heating pipe network; a multifunctional corrosion inhibitor with pipe dredging effect is added to the heating pipe network by the dosing dredging device for dredging, and the corrosion inhibitor comprises the following components by weight percentage: carbon steel corrosion inhibitor 10%-30%; sodium silicate 10-20%, azole compound 1-10%, sodium hydroxide 1-10%, and the balance is water; the carbon steel corrosion inhibitor is an inorganic corrosion inhibitor, including a phosphate corrosion inhibitor; the azole compound is tolyltriazole, benzotriazole or 2-mercaptobenzothiazole; the dosing dredging device comprises: a dosing device which communicates with the heating pipe network and adds a set dose of the corrosion inhibitor to the heating pipe network; a filter and dirt removal device which comprises a cyclone dirt removal device and a tubular filter connected in parallel with the heating pipe network respectively; the cyclone dirt removal device is used to remove solid suspended matter in the heating pipe network; the tubular filter is used to remove corrosion products in the heating pipe network; a set dose of the corrosion inhibitor is added to the heating pipe network through the dosing device in the dosing dredging device, and the added dose of the corrosion inhibitor is 500-1000 mg / L; after the heating pipe network water containing the corrosion inhibitor is circulated for 48-50 h, the filter and dirt removal device in the dosing dredging device is started to discharge the attachments in the heating pipe network.

2. The unclogging method according to claim 1, characterized by, based on the corrosion inhibitor, it comprises the following components by weight percentage: carbon steel corrosion inhibitor 15%-25%; sodium silicate 12-20%, azole compound 2-5%, sodium hydroxide 2-8%, and the balance is water.

3. The unclogging method according to claim 1 or 2, characterized in that, the phosphate corrosion inhibitor is sodium hexametaphosphate.

4. The unclogging method of claim 1, wherein, when the dosing dredging device is started, the cyclone dirt removal device is started first to remove the solid suspended matter in the heating pipe network, and then the tubular filter is started to remove the corrosion products in the heating pipe network.

5. The unclogging method of claim 1, wherein, when the dosing dredging device is started, all the heating pipe network water passes through the bypass into the cyclone dirt removal device or the tubular filter.

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