A high-voltage heater rapid leak detection device and detection method

Abstract

The invention discloses a high-pressure heater rapid leak detection device and detection method, belonging to the technical field of high-pressure heaters. The high-pressure heater rapid leak detection device comprises a data acquisition unit, the data acquisition unit is composed of an acquisition module, a judgment module and a processing module, the high-pressure heater is provided with a data acquisition unit, the high-pressure heater comprises a water supply inlet, a steam inlet and a water supply pump, one end of the high-pressure heater is provided with a water supply inlet, one end of the water supply inlet is provided with a water supply pump, and the high-pressure heater is provided with a steam inlet. The acquisition unit is provided at the water supply port position of the water pump and the water supply inlet and outlet to collect and collect relevant data, and cooperate with the internal preset judgment logic to determine whether the high-pressure heater is leaking, and the leakage amount and leakage position of the high-pressure heater can be quickly found, which is convenient for the operating personnel to handle accidents and convenient for the maintenance personnel to accurately eliminate the leaking high-pressure heater.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage heaters, in particular to a high-voltage heater rapid leak detection device and a detection method. Background Art

[0002] The high-pressure heater is a part of the unit's heat recovery system. It utilizes the extraction steam from the unit's high and medium pressure cylinders to achieve heat exchange between steam and feed water through the heat transfer tube bundle of the high-pressure heater to heat the feed water. The heat recovery system is an important means for the unit to improve thermal economy. At present, high-pressure heating devices have become indispensable equipment for conventional large-scale thermal power units in China. In recent years, in order to meet the requirements of AGC instructions and cooperate with the peak-shaving needs of new energy such as wind and solar power during the actual operation of the unit, deep peak-shaving of the unit has become normalized.

[0003] Due to the frequent changes in the unit's thermal load and the sharp changes in thermal stress, leakage of the high-pressure heater often occurs. Leakage of the high-pressure heater poses a great threat to the safety of the unit and has a huge impact. After the high-pressure heater leaks, since the water side pressure is much greater than the steam side pressure, a large amount of water will leak to the steam side, causing the water level of the high-pressure heater to rise sharply. If the high-pressure heater water level protection does not work, the steam extraction valve is not closed, is not closed in time or is not closed tightly, water will pour into the cylinder and cause a water hammer accident in the turbine. In addition, after the high-pressure heater leaks, the tube bundle around the leaking part will be severely washed by the high-pressure water flow, causing more heat transfer tubes to leak, and it must be de-listed as soon as possible.

[0004] Due to the de-energization of the high-pressure heater, the feed water temperature dropped from 226°C to 150°C. In order to meet the load requirements of the unit, the coal feed must be increased, the output of each fan increased accordingly, the furnace temperature rose, the standard coal consumption increased, and the plant power consumption rate increased, affecting the economy of the unit. Therefore, in addition to operating according to regulations and controlling operating parameters during operation, it is also crucial to detect leakage of the high-pressure heater as early as possible. Summary of the invention

[0005] In view of the problem that the leakage of the high-voltage heater cannot be discovered early in the above-mentioned prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is the problem that the leakage of the high-pressure heater cannot be discovered early.

[0007] To achieve the above object, the present invention provides the following technical solution: a high-voltage heater rapid leak detection device, comprising:

[0008] A data acquisition unit, which is composed of an acquisition module, a judgment module and a processing module;

[0009] A high-pressure heater, wherein a data acquisition unit is arranged on the high-pressure heater, the high-pressure heater comprises a feed water inlet, a steam inlet and a feed water pump, a feed water inlet is arranged at one end of the high-pressure heater, a feed water pump is arranged at one end of the feed water inlet, and a steam inlet is arranged on the high-pressure heater.

[0010] As a further solution of the present invention: the acquisition module is used to obtain monitoring information of the high-voltage heater;

[0011] The judgment module is used to judge whether the high-voltage heater is suspected of leaking through a pre-established fault logic tree and the obtained monitoring information;

[0012] The processing module is used to determine whether the high-voltage heater is leaking and to perform a leak test on the high-voltage heater.

[0013] As a further solution of the present invention: the high-pressure heater also includes a water supply outlet, a drain inlet, a data terminal and an emergency drain outlet. The high-pressure heater is provided with a water supply outlet, a drain inlet is provided at one end of the high-pressure heater close to the steam inlet, and the high-pressure heater is also provided with an emergency drain outlet.

[0014] As a further solution of the present invention: the high-pressure heater is electrically connected to the data terminal through a data acquisition unit, a data acquisition unit is arranged between the water supply inlet and the water supply pump, and a data acquisition unit is arranged on the water supply outlet and the emergency drain outlet.

[0015] A detection method comprising:

[0016] Obtain monitoring information of high-voltage heater;

[0017] Determine whether the high-voltage heater is suspected of leaking based on the pre-established fault logic tree and the acquired monitoring information; when it is determined that the high-voltage heater is suspected of leaking, an alarm reminder is given in a preset manner, and a leakage test is performed on the high-voltage heater using preset detection means.

[0018] As a further scheme of the present invention: the monitoring information includes one or more of the following: steam-driven water supply pump speed, steam-driven water supply pump outlet flow, high water level fluctuation amplitude, high water level signal, upper end difference of drain end, lower end difference of drain end, normal drain regulating valve opening, normal drain regulating valve drain flow, emergency drain electric door opening frequency, and outlet water supply temperature.

[0019] As a further solution of the present invention: the judgment logic of the fault logic tree is:

[0020] When the speed of the feedwater pump increases to exceed a preset speed threshold, and the feedwater flow rate of the feedwater pump exceeds a first preset flow rate threshold, it is determined that the high-pressure heater is suspected of leaking;

[0021] When the fluctuation amplitude of the high-pressure heater water level exceeds the preset amplitude threshold, the high water level signal is in an alarm state, and the upper end difference of the drain end increases to exceed the first preset difference threshold, and the lower end difference of the drain end decreases to exceed the second preset difference threshold, it is judged that the high-pressure heater is suspected of leaking;

[0022] When the normal drain valve opening increases to exceed a preset opening threshold and the normal drain valve drain flow rate increases to exceed a second flow rate threshold, it is determined that the high-pressure heater is suspected of leaking;

[0023] When the frequency of opening the emergency drain port exceeds the preset frequency, it is determined that the high-pressure heater is suspected of leaking;

[0024] When the outlet water temperature of the feedwater drops below the preset temperature threshold, it is determined that the high-pressure heater is suspected of leaking.

[0025] As a further solution of the present invention: the water supply pump speed threshold is 5% of the current value, the water supply flow threshold at the water supply pump outlet is 5% of the current value of the water supply flow, the preset amplitude threshold is 5% of the current water level value, the preset temperature threshold is 5% of the standard value of the water temperature at the water supply outlet, the first preset difference threshold is 5% of the standard value of the upper end difference at the drain end, and the second preset difference threshold is 5% of the standard value of the lower end difference at the drain end.

[0026] As a further solution of the present invention: the leakage test method is:

[0027] De-energize the high-pressure heater under a preset load and inject water into the high-pressure heater;

[0028] When the outlet pressure on the water side of the high-pressure heater is lower than the feed water pressure by more than a preset pressure threshold, and the water level rising speed of the high-pressure heater is greater than a preset speed threshold, it is determined that the high-pressure heater is leaking.

[0029] As a further solution of the present invention: the preset method of the alarm reminder is: sending an alarm message to the work terminal of the attendant, making a voice alarm or sending an information alarm to the attendant.

[0030] Compared with the prior art, the beneficial effect of the present invention is that the high-pressure heater rapid leak detection device collects relevant data by setting a collection unit at the water pump water inlet and the water inlet and outlet, and cooperates with the internal preset judgment logic to determine whether the high-pressure heater is leaking, so as to better help the operating personnel to better monitor the working status of the high-pressure heater, and can quickly find the leakage amount and leakage location of the high-pressure heater, which is convenient for the operating personnel to handle accidents and for the maintenance personnel to accurately eliminate the leaking high-pressure heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0032] Figure 1 A schematic diagram of the overall structure of a high-voltage heater rapid leak detection device according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the overall structure of a data acquisition unit for a high-voltage heater rapid leak detection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0037] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0038] Example 1

[0039] like Figure 1 and Figure 2 As shown, the present invention provides a technical solution: a high-voltage heater rapid leak detection device, comprising:

[0040] The data acquisition unit 100 is composed of a collection module 101, a judgment module 102 and a processing module 103;

[0041] A high-pressure heater 200, on which a data acquisition unit 100 is disposed, the high-pressure heater 200 comprises a feedwater inlet 201, a steam inlet 204 and a feedwater pump 205, one end of the high-pressure heater 200 is provided with a feedwater inlet 201, one end of the feedwater inlet 201 is provided with a feedwater pump 205, and the high-pressure heater 200 is provided with a steam inlet 204;

[0042] Preferably, the high-pressure heater 200 also includes a water supply outlet 202, a drain inlet 203, a data terminal 206 and an emergency drain outlet 207. The high-pressure heater 200 is provided with a water supply outlet 202, a drain inlet 203 is provided at one end of the high-pressure heater 200 close to the steam inlet 204, and the high-pressure heater 200 is also provided with an emergency drain outlet 207.

[0043] In this embodiment, through the collection module 101, the judgment module 102 and the processing module 103 set inside the data collection unit 100, when performing detection work, with the help of the data collection unit 100, the collected data can be better collected and transmitted, and by collecting the corresponding data on the water supply inlet 201, the steam inlet 204 and the water supply pump 205, it can better help the staff to monitor the working condition of the high-pressure heater 200.

[0044] Example 2

[0045] Combined with Figure 1 and Figure 2 , it is concluded that: the acquisition module 101 is used to obtain the monitoring information of the high-pressure heater 200, the judgment module 102 is used to judge whether the high-pressure heater 200 is suspected of leaking through the pre-established fault logic tree and the obtained monitoring information, the processing module 103 is used to determine whether the high-pressure heater 200 is leaking, and perform a leakage test on the high-pressure heater 200, the high-pressure heater 200 is electrically connected to the data terminal 206 through the data acquisition unit 100, the data acquisition unit 100 is arranged between the water supply inlet 201 and the water supply pump 205, and the data acquisition unit 100 is arranged on the water supply outlet 202 and the emergency drain 207.

[0046] In this embodiment: the collected data are summarized and collected through the data acquisition unit 100 and the data terminal 206 which are electrically connected to each other. The data acquisition unit 100 arranged on the water supply outlet 202 and the emergency drain outlet 207 can collect the flow rate at the water supply outlet 202 and the number of opening times of the emergency drain outlet 207.

[0047] Example 3

[0048] Combined with Figure 1 and Figure 2, it is concluded that: a detection method obtains the monitoring information of the high-pressure heater 200, and determines whether the high-pressure heater 200 is suspected of leaking according to the pre-established fault logic tree and the obtained monitoring information; when it is determined that the high-pressure heater 200 is suspected of leaking, an alarm reminder is given in a preset manner, and a leakage test is performed on the high-pressure heater 200 through a preset detection method, and data such as the speed of the steam-driven feedwater pump, the outlet flow rate of the steam-driven feedwater pump, the fluctuation amplitude of the high-pressure water level, the high water level signal, the upper end difference of the drain end, the lower end difference of the drain end, the normal drain regulating valve opening, the normal drain regulating valve drain flow rate, the opening frequency of the emergency drain electric door, and the outlet feedwater temperature are collected.

[0049] In this embodiment: the monitoring information includes the speed of the steam-driven water supply pump, the outlet flow rate of the steam-driven water supply pump, the fluctuation amplitude of the high water level, the high water level signal, the upper end difference of the drain end, the lower end difference of the drain end, the normal drain regulating valve opening, the normal drain regulating valve drain flow rate, the opening frequency of the emergency drain electric door, and the outlet water supply temperature, and the logical basis for the fault logic tree judgment is the speed of the water supply pump 205, the water level fluctuation amplitude, the opening degree and opening frequency of the water outlet and the water temperature.

[0050] The working principle of the present invention is: obtaining the steam-driven feed water pump speed, steam-driven feed water pump outlet flow, high water level fluctuation amplitude, high water level signal, upper end difference of the drain end, lower end difference of the drain end, normal drain regulating valve opening, normal drain regulating valve drain flow, emergency drain electric door opening frequency, and outlet feed water temperature of the high-pressure heater 200, and judging whether the high-pressure heater 200 is suspected of leaking according to the pre-established fault logic tree and the obtained monitoring information, when the speed of the feed water pump 205 increases by more than the preset speed threshold, and the feed water flow of the feed water pump 205 exceeds the first preset flow threshold , judge that the high-pressure heater 200 is suspected of leaking. When the fluctuation amplitude of the high-pressure water level exceeds the preset amplitude threshold, the high water level signal is in an alarm state, and the upper end difference of the drain end increases by more than the first preset difference threshold, and the lower end difference of the drain end decreases by more than the second preset difference threshold, it is judged that the high-pressure heater 200 is suspected of leaking. When the opening of the normal drain valve increases by more than the preset opening threshold and the drain flow of the normal drain valve increases by more than the second flow threshold, it is judged that the high-pressure heater 200 is suspected of leaking. When the opening frequency of the emergency drain port 207 exceeds the preset frequency, it is judged that the high-pressure heater 200 is suspected of leaking. Leakage, when the water temperature at the water outlet 202 drops below the preset temperature threshold, it is determined that the high-pressure heater 200 is suspected of leaking, wherein the threshold is the speed threshold of the water pump 205 is 5% of the current value, the water flow threshold at the outlet of the water pump 205 is 5% of the current value of the water flow, the preset amplitude threshold is 5% of the current value of the water level, the preset temperature threshold is 5% of the standard value of the water temperature at the water outlet 202, the first preset difference threshold is 5% of the standard value of the upper end difference of the drain end, and the second preset difference threshold is 5% of the standard value of the lower end difference of the drain end. When it is determined that the high-pressure heater 200 is suspected of leaking In case of suspected leakage, an alarm reminder will be given in a preset manner, and the high-pressure heater 200 will be leak tested by preset detection means. The leakage test method is: the high-pressure heater 200 is decoupled under a preset load, and water is injected into the high-pressure heater 200. When the water side outlet pressure of the high-pressure heater 200 is lower than the water supply pressure by more than the preset pressure threshold, and the water level rising speed of the high-pressure heater 200 is greater than the preset speed threshold, it is determined that the high-pressure heater 200 is leaking, and after the leakage is determined, an alarm message is sent to the duty officer's work terminal, a voice alarm is issued to the duty officer, or an information alarm is sent.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a number of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible, for example, the size, scale, structure, shape and proportion of various elements, and parameter values ​​such as temperature, pressure, etc., mounting arrangements, use of materials, color, directional changes, etc., without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to several modifications still falling within the scope of the appended claims.

[0052] Furthermore, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment may not be described, i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention or those features that are not relevant to implementing the invention.

[0053] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high-voltage heater rapid leak detection device, characterized in that: include, A data collection unit (100), the data collection unit (100) comprising a collection module (101), a judgment module (102) and a processing module (103); and, A high-pressure heater (200), wherein a data acquisition unit (100) is arranged on the high-pressure heater (200), wherein the high-pressure heater (200) comprises a feed water inlet (201), a steam inlet (204) and a feed water pump (205), wherein a feed water inlet (201) is arranged at one end of the high-pressure heater (200), a feed water pump (205) is arranged at one end of the feed water inlet (201), and a steam inlet (204) is arranged on the high-pressure heater (200).

2. The high-voltage heater rapid leak detection device according to claim 1, characterized in that: The acquisition module (101) is used to obtain monitoring information of the high-voltage heater (200); The judgment module (102) is used to judge whether the high-voltage heater (200) is suspected of leaking through a pre-established fault logic tree and acquired monitoring information; The processing module (103) is used to determine whether the high-voltage heater (200) is leaking, and to perform a leakage test on the high-voltage heater (200).

3. The high-voltage heater rapid leak detection device according to claim 2, characterized in that: The high-pressure heater (200) further comprises a water supply outlet (202), a drain inlet (203), a data terminal (206) and an emergency drain outlet (207); the high-pressure heater (200) is provided with a water supply outlet (202); a drain inlet (203) is provided at one end of the high-pressure heater (200) close to the steam inlet (204); and the high-pressure heater (200) is also provided with an emergency drain outlet (207).

4. The high-voltage heater rapid leak detection device according to claim 3, characterized in that: The high-pressure heater (200) is electrically connected to the data terminal (206) via a data acquisition unit (100); a data acquisition unit (100) is provided between the water supply inlet (201) and the water supply pump (205); and a data acquisition unit (100) is provided on the water supply outlet (202) and the emergency drain outlet (207).

5. A detection method, characterized in that: The high-voltage heater rapid leak detection device according to any one of claims 1 to 4 comprises: Acquiring monitoring information of the high-pressure heater (200); Whether the high-voltage heater (200) is suspected of leaking is determined based on a pre-established fault logic tree and the acquired monitoring information; when it is determined that the high-voltage heater (200) is suspected of leaking, an alarm is given in a preset manner, and a leakage test is performed on the high-voltage heater (200) using a preset detection method.

6. The detection method according to claim 5, characterized in that: The monitoring information includes one or more of the following: steam-driven water supply pump speed, steam-driven water supply pump outlet flow, high water level fluctuation amplitude, high water level signal, upper end difference of drain end, lower end difference of drain end, normal drain regulating valve opening, normal drain regulating valve drain flow, emergency drain electric door opening frequency, and outlet water supply temperature.

7. The detection method according to claim 6, characterized in that: The judgment logic of the fault logic tree is: When the rotation speed of the water supply pump (205) increases to exceed a preset rotation speed threshold, and the water supply flow rate of the water supply pump (205) exceeds a first preset flow rate threshold, it is determined that the high-pressure heater (200) is suspected of leaking; When the fluctuation amplitude of the high pressure water level exceeds a preset amplitude threshold, the high water level signal is in an alarm state, and the upper end difference of the drain end increases to exceed a first preset difference threshold, and the lower end difference of the drain end decreases to exceed a second preset difference threshold, it is determined that the high pressure heater (200) is suspected of leaking; When the normal drain valve opening increases to exceed a preset opening threshold and the normal drain valve drain flow rate increases to exceed a second flow rate threshold, it is determined that the high-pressure heater (200) is suspected of leaking; When the frequency of opening the emergency drain port (207) exceeds a preset frequency, it is determined that the high-pressure heater (200) is suspected of leaking; When the water temperature at the water supply outlet (202) drops below a preset temperature threshold, it is determined that the high-pressure heater (200) is suspected of leaking.

8. The detection method according to claim 7, characterized in that: The speed threshold of the water supply pump (205) is 5% of the current value, the water supply flow threshold at the outlet of the water supply pump (205) is 5% of the current value of the water supply flow, the preset amplitude threshold is 5% of the current value of the water level, the preset temperature threshold is 5% of the standard value of the water temperature at the water supply outlet (202), the first preset difference threshold is 5% of the standard value of the upper end difference of the drain end, and the second preset difference threshold is 5% of the standard value of the lower end difference of the drain end.

9. The detection method according to claim 8, characterized in that: The leakage test method is: de-energizing the high-pressure heater (200) at a preset load, and injecting water into the high-pressure heater (200); When the water side outlet pressure of the high-pressure heater (200) is lower than the water supply pressure by more than a preset pressure threshold, and the water level rising speed of the high-pressure heater (200) is greater than a preset speed threshold, it is determined that the high-pressure heater (200) is leaking.

10. The detection method according to claim 9, characterized in that: The preset method of the alarm reminder is: sending an alarm message to the work terminal of the duty officer, making a voice alarm or sending an information alarm to the duty officer.

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