Maintenance method of heat supply network system

Abstract

The invention relates to a heat supply network system maintenance method, a heat supply network system comprises a heater and a heat supply network water pipeline, the heater is connected to the heat supply network water pipeline, the heat supply network water pipeline is used for being connected with a heat supply network user in an on-off mode, and the maintenance method comprises the steps that the heat supply network water pipeline is connected with a water supplementing pipeline, and the water supplementing pipeline is connected to the upstream of the heater; the communication between a heat supply network water pipeline and a heat supply network user is cut off, and the communication between a water supplementing pipeline and the heat supply network water pipeline is cut off; a water supplementing pipeline is communicated with a heat supply network water pipeline, and alkaline water is supplemented into the heat supply network water pipeline through the water supplementing pipeline; and after the heat supply network water pipeline is filled with the alkaline water, the communication between the water supplementing pipeline and the heat supply network water pipeline is cut off. After the heat supply network system is stopped, the alkaline water is filled into the heat supply network water pipeline, so that the carbon steel material forming the heat supply network water pipeline can be passivated, the probability that the heat supply network water pipeline is corroded is reduced, the service life of the heat supply network water pipeline is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of heating network systems, and in particular, to a maintenance method for a heating network system. Background Art

[0002] The heating network system is the main component of the centralized heating system and is responsible for the transmission of heat energy. Generally, the hot steam generated by the boiler is supplied to the users of the heating network, and the users of the heating network are heated through components such as heat exchangers. During the operation of the heating network, there will be a certain period of downtime in each cycle. In order to prevent oxygen corrosion after the shutdown of the heating network system, the water side and steam side of the heating network system need to be shut down for maintenance. In the existing water-side maintenance method, the original water and air mixture inside the system is prone to reaction after the system is shut down. After a long time, it will cause corrosion of carbon steel pipes and components in the operation of the heating network system and scaling of the heater during operation, causing the pipes and corrosion of the heating network system to leak, resulting in the withdrawal of the heating network system. Summary of the invention

[0003] The purpose of the present invention is to provide a maintenance method for a heating network system to reduce the corrosion of the heating network, increase the life of the heating network pipelines, and reduce maintenance costs.

[0004] In order to achieve the above-mentioned object, the present disclosure provides a maintenance method for a heating network system, wherein the heating network system comprises a heater and a heating network water pipeline, wherein the heater is connected to the heating network water pipeline, and the heating network water pipeline is used to be connected to a heating network user in an on-off manner, and the maintenance method comprises: A water supply pipeline is connected to the heating network water pipeline, and the water supply pipeline is connected upstream of the heater; Cutting off the connection between the heating network water pipeline and the heating network users, and cutting off the connection between the water supply pipeline and the heating network water pipeline; connecting the water supply pipeline to the heating network water pipeline, and supplying alkaline water to the heating network water pipeline through the water supply pipeline; and After the alkaline water fills the heating network water pipeline, the connection between the water replenishment pipeline and the heating network water pipeline is cut off.

[0005] Optionally, before the step of connecting the water replenishment pipeline with the heating network water pipeline and replenishing alkaline water into the heating network water pipeline through the water replenishment pipeline, the alkaline water to be replenished into the heating network water pipeline is softened.

[0006] Optionally, in the step of softening the alkaline water to be added to the hot water network pipeline, the maintenance method includes: Treat the water with lime so that the pH value of the added alkaline water is greater than 10; The water is treated using a sodium ion exchanger.

[0007] Optionally, the heating network water pipeline is connected to a venting pipeline that can be switched on and off. Before the step of connecting the water supply pipeline with the heating network water pipeline and replenishing alkaline water into the heating network water pipeline through the water supply pipeline, the maintenance method includes: The venting line is opened.

[0008] Optionally, the heating network water pipeline includes a water inlet and a water outlet respectively used to be connected to the heating network users, and the maintenance method includes: A communication door is provided between the water inlet and the water outlet; and The communication gate is turned on.

[0009] Optionally, in the step of turning on the communication door, the maintenance method includes: A branch between the water inlet of the heater and the water supply pipeline is connected to the heating network water pipeline, and a circulating pump is arranged on the branch so that the water flow direction of the branch is opposite to that of the heating network water pipeline; A drainage pipeline connected to the outside is provided on the branch line in an on-off manner; and The drainage pipeline is opened.

[0010] Optionally, the interior of the heater includes a steam chamber wrapped around the outside of the hot water network pipeline, and the steam chamber is connected to a charging pipeline for connecting to a nitrogen source and an exhaust pipeline for connecting to the outside in a switchable manner, and the maintenance method includes: connecting the exhaust pipe; opening the gas charging pipeline to charge the steam cabin with nitrogen; and Close the exhaust line and the charging line.

[0011] Optionally, after the step of opening the exhaust pipeline, the maintenance method includes: measuring the oxygen concentration at the outlet of the exhaust line; and When the oxygen concentration is less than 2%, the exhaust pipeline and the charging pipeline are closed.

[0012] Optionally, before the step of measuring the oxygen concentration at the outlet of the exhaust pipe, the maintenance method includes: The charging pipeline is opened to charge the steam cabin with nitrogen until the volume of the charged nitrogen is not less than 3 times the volume of the steam cabin.

[0013] Optionally, the maintenance method includes: The steam cabin is pressure-monitored and the pressure range of the steam cabin is controlled to be between 10-30 kPa.

[0014] Optionally, in the step of monitoring the pressure of the steam cabin and controlling the pressure range of the steam cabin to be between 10-30 kPa, the maintenance method includes: After each interval time t, record the pressure data p of the steam cabin; When the pressure data p is less than 10 kPa, the inflation pipeline is opened.

[0015] Through the above technical solution, after the heating network system is shut down, the heating network water pipeline is filled with alkaline water. The alkaline water has a high pH value, which can passivate the carbon steel material constituting the heating network water pipeline, thereby maintaining the entire heating network water pipeline, reducing the probability of corrosion of the heating network water pipeline, increasing the life of the heating network water pipeline, and reducing maintenance costs.

[0016] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a heating network system according to an embodiment of the present disclosure.

[0018] Figure 2 It is a schematic diagram of nitrogen flow in a maintenance method of a heating network system according to an embodiment of the present disclosure.

[0019] Figure 3 It is a schematic diagram of water flow in a maintenance method of a heating network system according to an embodiment of the present disclosure.

[0020] Description of Reference Numerals 1-heater; 11-steam cabin; 111-inflating pipeline; 112-exhaust pipeline; 113-sewage pipeline; 2-heating network water pipeline; 201-water inlet; 202-water outlet; 21-branch; 211-circulating pump; 212-drainage pipeline; 22-reducing joint; 3-water supply pipeline; 31-water supply tank; 32-water supply pump; 4-communication door; 5-heating network user. DETAILED DESCRIPTION

[0021] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0022] In the present disclosure, in the absence of any contrary description, the directional words used, such as "inside", "outside", are defined with respect to the contours of the corresponding components. In addition, in the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0023] According to one embodiment of the present disclosure, Figures 1 to 3 As shown, a maintenance method for a heating network system is provided. The heating network system may include a heater 1 and a heating network water pipeline 2. The heater 1 is connected to the heating network water pipeline 2. The heating network water pipeline 2 is used to be connected to a heating network user 5 in an on-off manner. Here, a plurality of heaters 1 may be connected to the heating network water pipeline 2, and the plurality of heaters 1 may be independently connected to the heating network water pipeline 2. The present disclosure does not limit this. The maintenance method may include the following steps: first, connecting a water replenishment pipeline 3 to the heating network water pipeline 2, and the water replenishment pipeline 3 is connected upstream of the heater 1; after the water replenishment pipeline 3 is connected, the connection between the heating network water pipeline 2 and the heating network user 5 is cut off, and the connection between the water replenishment pipeline 3 and the heating network water pipeline 2 is cut off; after cutting off the connection between the heating network water pipeline 2 and the outside, the water replenishment pipeline 3 and the heating network water pipeline 2 are connected, and alkaline water is replenished into the heating network water pipeline 2 through the water replenishment pipeline 3; after the alkaline water fills the heating network water pipeline 2, the connection between the water replenishment pipeline 3 and the heating network water pipeline 2 is cut off.

[0024] Through the above technical solution, after the heating network system is shut down, the heating network water pipeline 2 is filled with alkaline water. The alkaline water has a high pH value, which can passivate the carbon steel material constituting the heating network water pipeline 2, thereby maintaining the entire heating network water pipeline 2, reducing the probability of corrosion of the heating network water pipeline 2, increasing the life of the heating network water pipeline 2, and reducing maintenance costs.

[0025] Furthermore, before the step of connecting the water supply pipeline 3 with the heating network water pipeline 2 and supplying alkaline water to the heating network water pipeline 2 through the water supply pipeline 3, the alkaline water supplied to the heating network water pipeline 2 may be softened. Softening the water may reduce the content of compounds in the water, so that the hardness of the water supplied to the heating network water pipeline 2 is less than 5umol / L, further reducing the possibility of alkaline water structure supplied to the heating network water pipeline 2.

[0026] Furthermore, in the step of softening the alkaline water to be replenished into the heat network water pipeline 2, the water can be treated with lime, which can not only soften the water but also increase the pH value of the water so that the pH value of the replenished alkaline water is greater than 10. After the water is treated with lime water, the water is treated with a sodium ion exchanger, that is, the water is subjected to sodium bed treatment, which can effectively reduce the content of metal ions such as calcium ions and magnesium ions in the water, reduce the hardness of the water, further reduce the possibility of chemical reaction between the replenished water and the pipe wall of the heat network water pipeline 2, and reduce the probability of corrosion of the pipe wall of the heat network water pipeline 2.

[0027] According to an embodiment of the present disclosure, a venting pipeline that can be switched on and off can also be connected to the hot water network pipe 2. Before the water supply pipe 3 is connected to the hot water network pipe 2 and the alkaline water is added to the hot water network pipe 2 through the water supply pipe 3, the maintenance method can also include the step of connecting the venting pipeline, that is, connecting the venting pipeline to vent the hot water network pipe 2. Here, since the gas density is less than the liquid density, the venting pipeline can be located at the upper position in the height direction of the hot water network pipe 2, which can be conducive to venting. Connecting the venting pipeline can not only empty the gas generated by the chemical reaction between the water in the original pipe and the pipe wall, but also reduce the air pressure in the pipe, so that in the subsequent step of adding water to the hot water network pipe 2, water can be added as much as possible, reducing the possibility of air being trapped in the pipe, reducing the possibility of the alkaline water added later reacting with the air, and reducing the probability of the pipe wall of the hot water network pipe 2 being corroded.

[0028] According to one embodiment of the present disclosure, Figures 1 to 3 As shown, the heating network water pipeline 2 may include a water inlet 201 and a water outlet 202 respectively used to connect to the heating network users 5. The maintenance method may include setting a communication door 4 between the water inlet 201 and the water outlet 202. Before adding alkaline water to the heating network water pipeline 2, the communication door 4 may be opened first, so that the heating network water pipeline 2 can form a circulation, so that the water in the heating network water pipeline 2 can circulate.

[0029] Furthermore, in the step of opening the communication door 4, the maintenance method may include the steps of connecting a branch 21 located between the water inlet end of the heater 1 and the water supply pipeline 3 to the heating network water pipeline 2, and setting a circulating pump 211 on the branch 21. The circulating pump 211 and the branch 21 can make the water flow direction of the branch 21 opposite to the water flow direction of the heating network water pipeline 2. A drainage pipeline 212 connected to the outside can be set on the branch 21 in a switchable manner. After the drainage pipeline 212 is set and the communication door 4 is opened, the drainage pipeline 212 can be opened, and when the pipeline is blocked, the heating network water pipeline 2 can be drained or discharged.

[0030] According to one embodiment of the present disclosure, Figures 1 to 3As shown, the interior of the heater 1 may include a steam cabin 11 wrapped around the outside of the hot water network pipeline 2, and the steam cabin 11 may be connected to a charging pipeline 111 for connecting to a nitrogen source and an exhaust pipeline 112 for connecting to the outside, and the maintenance method includes the following steps: first, the exhaust pipeline 112 is opened to discharge the original steam in the steam cabin 11, and then the charging pipeline 111 is opened to charge the steam cabin 11 with nitrogen, and when the nitrogen charging is completed, the exhaust pipeline 112 and the charging pipeline 111 are closed to fill the steam cabin 11 with nitrogen. Since nitrogen is an inactive gas, nitrogen filling the steam cabin 11 can replace the original steam, effectively reducing the possibility of the internal structure of the heater 1 reacting with oxygen in the air, reducing corrosion to the heater 1, and thus achieving maintenance of the heater 1.

[0031] Furthermore, after the step of opening the exhaust pipe 112, the maintenance method may further include the following steps to confirm whether the nitrogen filling meets the standard. First, the oxygen concentration at the outlet of the exhaust pipe 112 may be measured. When the oxygen concentration is less than 2%, the exhaust pipe 112 and the charging pipe 111 may be closed. The lower the oxygen concentration at the outlet, the lower the oxygen content in the steam cabin 11, the lower the possibility of oxidation reaction in the internal structure of the heater 1, and the better the maintenance effect of the heater 1. Although the amount of steam discharged from the steam cabin 11 may increase with the increase of nitrogen filling amount and the extension of nitrogen filling time, the nitrogen will mix with the original steam and air in the steam cabin 11 during the nitrogen filling process, and it cannot be guaranteed that the original air and steam components are completely removed. After the oxygen concentration at the outlet of the exhaust pipe 112 is less than 2%, part of the original steam and air in the steam cabin 11 have been mixed with nitrogen. If nitrogen is filled again, a large amount of nitrogen will be discharged during the exhaust process. When the oxygen concentration is less than 2%, the oxygen content is extremely small, and the probability of oxidation reaction in the internal structure of the heater 1 is low. Therefore, considering the maintenance cost, the exhaust pipe 112 and the charging pipe 111 can be closed when the oxygen concentration is less than 2%.

[0032] Furthermore, the maintenance method may also include the following steps, that is, before the step of measuring the oxygen concentration at the outlet of the exhaust pipe 112, the charging pipe 111 may be opened to charge the steam cabin 11 with nitrogen until the volume of the charged nitrogen is not less than 3 times the volume of the steam cabin 11. After many tests, it was found that charging 3 times the volume of nitrogen can generally reduce the oxygen concentration to below the target value, so charging 3 times the volume of nitrogen before testing the oxygen concentration can effectively reduce the measurement time and improve work efficiency.

[0033] According to an embodiment of the present disclosure, the maintenance method further includes the step of monitoring the pressure of the steam cabin 11 and controlling the pressure range of the steam cabin 11 to be between 10-30 kPa. The pressure of the steam cabin 11 within this range can ensure that the maintenance of the steam cabin 11 is in a good state, and the steam cabin 11 can be fully maintained while ensuring safety, thereby extending the service life of the steam cabin 11. When the pressure of the steam cabin 11 exceeds this range, the steam cabin 11 is prone to the risk of explosion and leakage. When the pressure of the steam cabin 11 is lower than this range, the steam cabin 11 will not be filled with nitrogen, affecting the maintenance effect of the steam cabin 11. Specifically, in the step of monitoring the pressure of the steam cabin 11 and controlling the pressure range of the steam cabin 11 to be within a range of not less than 10 kPa and not more than 30 kPa, that is, between 10-30 kPa, the maintenance method includes the following steps, that is, recording the pressure data p of the steam cabin 11 after each interval time t, and the interval time t can be set according to actual work needs, and the steam cabin 11 can be monitored in time, and the present disclosure does not limit this. When the pressure data p is less than 10 kPa, the inflation pipeline 111 can be opened to fill the steam cabin 11 with nitrogen until the pressure in the steam cabin 11 reaches 30 kPa. Closing the inflation pipeline 111 can not only fill the steam cabin 11 with nitrogen to ensure the maintenance effect, but also reduce safety risks such as explosion and leakage, improve the safety of on-site operations, and reduce the probability of accidents.

[0034] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0035] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0036] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A maintenance method for a heating network system, characterized in that: The heating network system comprises a heater and a heating network water pipeline, wherein the heater is connected to the heating network water pipeline, and the heating network water pipeline is used to be connected to the heating network user in an on-off manner. The maintenance method comprises: A water supply pipeline is connected to the heating network water pipeline, and the water supply pipeline is connected upstream of the heater; Cutting off the connection between the heating network water pipeline and the heating network users, and cutting off the connection between the water supply pipeline and the heating network water pipeline; connecting the water supply pipeline to the heating network water pipeline, and supplying alkaline water to the heating network water pipeline through the water supply pipeline; and After the alkaline water fills the heating network water pipeline, the connection between the water replenishment pipeline and the heating network water pipeline is cut off.

2. The maintenance method of the heating network system according to claim 1, characterized in that: Before the step of connecting the water supply pipeline with the heating network water pipeline and supplying alkaline water to the heating network water pipeline through the water supply pipeline, the alkaline water to be supplied to the heating network water pipeline is softened.

3. The maintenance method of the heating network system according to claim 2, characterized in that: In the step of softening the alkaline water to be added to the hot water network pipeline, the maintenance method includes: Treat the water with lime so that the pH value of the added alkaline water is greater than 10; The water is treated using a sodium ion exchanger.

4. The maintenance method of the heating network system according to claim 1, characterized in that: The heating network water pipeline is connected with a venting pipeline that can be switched on and off. Before the step of connecting the water supply pipeline with the heating network water pipeline and replenishing alkaline water into the heating network water pipeline through the water supply pipeline, the maintenance method includes: The venting line is opened.

5. The maintenance method of the heating network system according to claim 1, characterized in that: The heating network water pipeline comprises a water inlet and a water outlet respectively connected to the heating network users, and the maintenance method comprises: A communication door is provided between the water inlet and the water outlet; and The communication gate is turned on.

6. The maintenance method of the heating network system according to claim 5, characterized in that: In the step of turning on the communication door, the maintenance method includes: A branch between the water inlet of the heater and the water supply pipeline is connected to the heating network water pipeline, and a circulating pump is arranged on the branch so that the water flow direction of the branch is opposite to that of the heating network water pipeline; A drainage pipeline connected to the outside is provided on the branch line in an on-off manner; and The drainage pipeline is opened.

7. The maintenance method of a heating network system according to any one of claims 1 to 6, characterized in that: The interior of the heater includes a steam chamber wrapped around the outside of the hot water network pipeline, and the steam chamber is connected to a charging pipeline for connecting to a nitrogen source and an exhaust pipeline for connecting to the outside in a switchable manner. The maintenance method includes: connecting the exhaust pipe; opening the gas charging pipeline to charge the steam cabin with nitrogen; and Close the exhaust line and the charging line.

8. The maintenance method of the heating network system according to claim 7, characterized in that: After the step of opening the exhaust pipe, the maintenance method includes: measuring the oxygen concentration at the outlet of the exhaust line; and When the oxygen concentration is less than 2%, the exhaust pipeline and the charging pipeline are closed.

9. The maintenance method of the heating network system according to claim 8, characterized in that: Before the step of measuring the oxygen concentration at the outlet of the exhaust pipe, the maintenance method includes: The charging pipeline is opened to charge the steam cabin with nitrogen until the volume of the charged nitrogen is not less than 3 times the volume of the steam cabin.

10. The maintenance method of the heating network system according to claim 7, characterized in that: The maintenance method comprises: The steam cabin is pressure-monitored and the pressure range of the steam cabin is controlled to be between 10-30 kPa.

11. The maintenance method of the heating network system according to claim 10, characterized in that: In the step of monitoring the pressure of the steam cabin and controlling the pressure range of the steam cabin to be between 10-30 kPa, the maintenance method includes: After each interval time t, record the pressure data p of the steam cabin; When the pressure data p is less than 10 kPa, the inflation pipeline is opened.

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