Condensed water hydrogen conductivity standard exceeding diagnosis system and method

Abstract

The invention relates to the technical field of power plant water quality monitoring, and discloses a condensation water hydrogen conductivity standard-exceeding diagnosis system and method.The condensation water hydrogen conductivity standard-exceeding diagnosis system comprises a sample injection assembly, a cation exchanger, a degassing device, a conductivity meter, a total organic carbon analysis meter and a control system; the hydrogen conductivity value of the condensed water of the generator set before degassing, the degassing hydrogen conductivity value of the degassed condensed water and the total organic carbon value can be sequentially obtained, and then whether the hydrogen conductivity of the condensed water is abnormal or not is diagnosed according to one or more of the hydrogen conductivity value, the degassing hydrogen conductivity value and the total organic carbon value. And the abnormal reason is determined when the hydrogen conductivity of the condensed water is abnormal, so that rapid and intelligent diagnosis of standard exceeding of the hydrogen conductivity of the condensed water is realized, the water vapor abnormality diagnosis efficiency and accuracy are greatly improved, and the dependence on the technical capability and experience of technicians of power generation enterprises is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring in power plants, and particularly to a diagnosis system and method for excessive hydrogen conductivity of condensate water. Background Art

[0002] Excessive hydrogen conductivity of water vapor will directly cause corrosion, scaling, and salt deposition in the thermal system, threatening the safe and stable operation of the unit. For some units without a polishing treatment system or unable to treat condensate water in full flow, when the quality of condensate water and water vapor deteriorates, it will quickly affect the quality of water vapor in the entire thermal system.

[0003] Currently, most units start and stop frequently. The frequent start and stop of the unit makes it difficult for the vacuum pump to adapt well to the rapid switching state of the unit, and there will be a situation where the vacuum in the condenser is not in place. The content of dissolved carbon dioxide in the condensate water increases, the hydrogen conductivity of the condensate water increases. The makeup water volume of heat supply units is larger than that of non-heat supply units, and a large amount of organic matter in demineralized water enters the thermal system with the increase of makeup water volume, resulting in an increase in the hydrogen conductivity of water vapor. Leakage of the condenser will also cause the hydrogen conductivity of the condensate water to exceed the standard. When the condenser leaks significantly, diagnosis can be carried out by combining indicators such as hardness, sodium, and silicon in addition to hydrogen conductivity. Currently, the situation where the condenser leaks significantly and the condensate water indicators are significantly abnormal is less, and the situation where the condensate water indicators significantly exceed the standard is also relatively easy to diagnose. Instead, there are more situations where the hydrogen conductivity of the condensate water continuously slightly exceeds the standard while other indicators have no obvious abnormality and are not easy to diagnose. Micro-seepage of the condenser, dissolution of carbon dioxide, increase in makeup water volume, including resin failure, will all cause slight excess of hydrogen conductivity of the condensate water.

[0004] The existing technology can only combine hydrogen conductivity, degassed hydrogen conductivity, and total organic carbon content (TOC) detection individually and judge one by one based on the experience of technicians, and the diagnosis result is not accurate enough. Summary of the Invention

[0005] In view of this, the present invention provides a diagnosis system and method for excessive hydrogen conductivity of condensate water to solve or partially solve the technical problem that the result of the existing condensate water hydrogen conductivity diagnosis scheme is not accurate enough.

[0006] The technical solution proposed by the present invention is as follows:

[0007] In the first aspect of the present invention, a diagnosis system for excessive hydrogen conductivity of condensate water is provided, which includes a sampling component, a cation exchanger, a degassing device, a conductivity meter, a total organic carbon analyzer, and a control system; the sampling component is connected to the cation exchanger and the total organic carbon analyzer respectively through pipelines, and is used for sampling the condensate water of the generator set and transporting the sampled condensate water to the cation exchanger and the total organic carbon analyzer respectively; the cation exchanger is used for removing cations in the condensate water; the degassing device, the inlet end of which is connected to the cation exchanger through a pipeline, is used for degassing the received condensate water; the conductivity meter is connected to the outlet end of the degassing device and the outlet end of the cation exchanger respectively, and is used for detecting the hydrogen conductivity value of the condensate water output by the cation exchanger and the degassed hydrogen conductivity value of the condensate water after degassing by the degassing device; the total organic carbon analyzer is used for detecting the total organic carbon value of the condensate water; the control system is connected to the conductivity meter and the total organic carbon analyzer respectively, and obtains the hydrogen conductivity value, the degassed hydrogen conductivity value, and the total organic carbon value by controlling the operation of the sampling component, the cation exchanger, the degassing device, the conductivity meter, and the total organic carbon analyzer, diagnoses whether the hydrogen conductivity of the condensate water is abnormal according to one or more of the hydrogen conductivity value, the degassed hydrogen conductivity value, and the total organic carbon value, and determines the cause of the abnormality when the hydrogen conductivity of the condensate water is abnormal.

[0008] Optionally, the sampling component includes a sampling pipe, and the diagnosis system for excessive hydrogen conductivity of condensate water further includes a first three-way valve and a second three-way valve; one interface of the first three-way valve is connected to the sampling pipe, and the other two interfaces of the first three-way valve are respectively connected to the inlet end of the cation exchanger and the total organic carbon analyzer through pipelines; the three interfaces of the second three-way valve are respectively connected to the outlet end of the cation exchanger, the inlet end of the degassing device, and the conductivity meter through pipelines; the control system is connected to the first three-way valve and the second three-way valve respectively to control the operating states of the first three-way valve and the second three-way valve.

[0009] Optionally, the control system includes a PLC control cabinet and a computer device; the PLC control cabinet is connected to the first three-way valve, the second three-way valve, and the conductivity meter respectively, and is used for controlling the operating states of the first three-way valve and the second three-way valve according to the mode instruction output by the computer device and obtaining the hydrogen conductivity value and the degassed hydrogen conductivity value detected by the conductivity meter; the computer device is connected to the PLC control cabinet and the total organic carbon analyzer respectively, and is used for generating a mode switching instruction and sending it to the PLC control cabinet, receiving the hydrogen conductivity value and the degassed hydrogen conductivity value sent by the PLC control cabinet and obtaining the total organic carbon value detected by the total organic carbon analyzer, diagnosing whether the hydrogen conductivity of the condensate water is abnormal according to one or more of the hydrogen conductivity value, the degassed hydrogen conductivity value, and the total organic carbon value, and determining the cause of the abnormality when the hydrogen conductivity of the condensate water is abnormal.

[0010] Optionally, the cation exchanger adopts an electrically automatically regenerated cation exchanger.

[0011] In a second aspect of the present invention, a method for diagnosing excessive hydrogen conductivity of condensate water is provided, which is applied to the condensate water hydrogen conductivity excessive diagnosis system according to any one of the first aspects of the present invention, and includes: generating a first mode instruction, controlling the cation exchanger and the conductivity meter to start running based on the first mode instruction, the condensate water sequentially passes through the sampling assembly and the cation exchanger and enters the conductivity meter, and the hydrogen conductivity value of the condensate water is obtained through the conductivity meter; diagnosing whether the hydrogen conductivity of the condensate water has a first abnormality based on the hydrogen conductivity value, if the first abnormality does not occur, the hydrogen conductivity of the condensate water is normal, if the first abnormality occurs, a second mode instruction is generated, and the degassing device is controlled to start running based on the second mode instruction, the condensate water sequentially passes through the sampling assembly, the cation exchanger and the degassing device and enters the conductivity meter, and the degassed hydrogen conductivity value of the condensate water after being degassed by the degassing device is obtained through the conductivity meter; diagnosing whether the hydrogen conductivity of the condensate water has a second abnormality based on the degassed hydrogen conductivity value, if the second abnormality occurs, it is determined that the cause of the abnormality is condenser leakage, if the second abnormality does not occur, a third mode instruction is generated, and the total organic carbon analyzer is controlled to start running based on the third mode instruction, the condensate water passes through the sampling assembly and enters the total organic carbon analyzer, and the total organic carbon value of the condensate water is obtained through the total organic carbon analyzer; diagnosing whether the hydrogen conductivity of the condensate water has a third abnormality based on the total organic carbon value, if the third abnormality does not occur, it is determined that the cause of the abnormality is poor condenser vacuum, if the third abnormality occurs, it is determined that the cause of the abnormality is high total organic carbon content in the make-up water.

[0012] Optionally, controlling the cation exchanger and the conductivity meter to start running based on the first mode instruction, the condensate water sequentially passes through the sampling assembly and the cation exchanger and enters the conductivity meter, and the hydrogen conductivity value of the condensate water is obtained through the conductivity meter, including: sending the first mode instruction to the PLC control cabinet, controlling the operating states of the first three-way valve and the second three-way valve based on the first mode instruction through the PLC control cabinet, so that the condensate water sequentially passes through the sampling assembly, the first three-way valve, the cation exchanger and the second three-way valve and enters the conductivity meter, and the hydrogen conductivity value of the condensate water is obtained through the conductivity meter.

[0013] Optionally, controlling the degassing device to start running based on the second mode instruction, the condensate water sequentially passes through the sampling assembly, the cation exchanger and the degassing device and enters the conductivity meter, and the degassed hydrogen conductivity value of the condensate water after being degassed by the degassing device is obtained through the conductivity meter, including: sending the second mode instruction to the PLC control cabinet and controlling the degassing device to start running, controlling the operating states of the first three-way valve and the second three-way valve based on the second mode instruction through the PLC control cabinet, so that the condensate water sequentially passes through the sampling assembly, the first three-way valve, the cation exchanger, the degassing device and the second three-way valve and enters the conductivity meter, and the degassed hydrogen conductivity value of the condensate water after being degassed by the degassing device is obtained through the conductivity meter.

[0014] Optionally, based on the third mode instruction, control the total organic carbon analyzer to start running. The condensate water enters the total organic carbon analyzer through the sampling assembly, and the total organic carbon value of the condensate water is obtained through the total organic carbon analyzer, including: sending the third mode instruction to the PLC control cabinet and controlling the total organic carbon analyzer to start running, controlling the operating states of the first three-way valve and the second three-way valve based on the third mode instruction through the PLC control cabinet, so that the condensate water sequentially passes through the sampling assembly and the first three-way valve and enters the total organic carbon analyzer, and obtaining the total organic carbon value of the condensate water through the total organic carbon analyzer.

[0015] Optionally, diagnose whether the hydrogen conductivity of the condensate water has a first abnormality based on the hydrogen conductivity value, including: comparing the magnitudes of the hydrogen conductivity value, the first set value, and the second set value. If the hydrogen conductivity value is less than or equal to the first set value, then a second abnormality does not occur. If the hydrogen conductivity value is greater than the first set value and less than or equal to the second set value, then a first abnormality occurs; and / or, diagnose whether the hydrogen conductivity of the condensate water has a second abnormality based on the degassed hydrogen conductivity value, including: comparing the magnitudes of the degassed hydrogen conductivity value, the third set value, and the fourth set value. If the degassed hydrogen conductivity value is less than or equal to the third set value, then a second abnormality does not occur. If the hydrogen conductivity value is greater than the third set value and less than or equal to the fourth set value, then a second abnormality occurs; and / or, diagnose whether the hydrogen conductivity of the condensate water has a third abnormality based on the total organic carbon value, including: comparing the magnitudes of the total organic carbon value and the fifth set value. If the total organic carbon value is less than or equal to the fifth set value, then a third abnormality does not occur. If the total organic carbon value is greater than the fifth set value, then a third abnormality occurs.

[0016] The third aspect of the present invention provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to implement the condensate water hydrogen conductivity over-standard diagnosis method according to any one of the second aspect of the present invention.

[0017] From the above technical solutions, it can be seen that the present invention has the following advantages:

[0018] A condensate water hydrogen conductivity over-standard diagnosis system and method provided by the present invention can control the operating conditions of the sampling assembly, the cation exchanger, the degassing device, the conductivity meter, and the total organic carbon analyzer through a control system, and can sequentially obtain the hydrogen conductivity value of the condensate water before degassing of the generator set, the degassed hydrogen conductivity value of the degassed condensate water, and the total organic carbon value. Furthermore, diagnose whether the hydrogen conductivity of the condensate water is abnormal based on one or more of the hydrogen conductivity value, the degassed hydrogen conductivity value, and the total organic carbon value, and determine the cause of the abnormality when the hydrogen conductivity of the condensate water is abnormal, realizing fast and intelligent diagnosis of condensate water hydrogen conductivity over-standard, greatly improving the efficiency and accuracy of water vapor abnormality diagnosis, and reducing the dependence on the technical capabilities and experience of technical personnel in power generation enterprises. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a condensate hydrogen conductivity exceeding standard diagnosis system in an embodiment of the present invention;

[0021] Figure 2 It is a flowchart of a method for a condensate hydrogen conductivity exceeding standard diagnosis system in an embodiment of the present invention;

[0022] Figure 3 It is a schematic structural diagram of a computer device in an embodiment of the present invention.

[0023] Reference numerals:

[0024] 1 - Sampling tube, 2 - First three - way valve, 3 - First pipeline, 4 - Fourth pipeline, 5 - Cation exchanger, 6 - Second pipeline, 7 - Second three - way valve, 8 - Third pipeline, 9 - Fifth pipeline, 10 - Degassing device, 11 - Sixth pipeline, 12 - Conductivity meter, 13 - Control cabinet, 14 - Computer device, 15 - Total organic carbon analyzer. Specific embodiments

[0025] The following will clearly and completely describe the technical solutions of the present invention with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0026] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Currently, for abnormal conditions based on the slight excess of hydrogen conductivity in condensate (less than or equal to 1 μS / cm) with no obvious abnormalities in other indicators, the existing judgment methods intelligently detect individual indicators such as hydrogen conductivity, degassed hydrogen conductivity, and total organic carbon content and make judgments one by one in combination with the experience of technicians, which have problems such as being incomplete, unreliable, highly dependent on the experience of technicians, and having a long diagnosis cycle. Moreover, most current gas turbine power generation enterprises have problems such as the rapid failure of on-line hydrogen conductivity meters, low equipped rate of degassed hydrogen conductivity, and lack of the ability to detect total organic carbon content.

[0030] In view of this, the embodiments of the present invention provide a condensate hydrogen conductivity excess diagnosis system and method, which are mainly applicable to fault diagnosis of condensers of thermal power units with large and unstable heat supply make-up water volumes during the operation stage, and are particularly applicable to abnormal diagnosis of slight excess of hydrogen conductivity in condensate. For example, the on-line hydrogen conductivity of condensate in a thermal power plant is slightly excessive and fluctuates greatly. This thermal power plant is a heat supply unit with a large heat supply and unstable raw water quality. The on-line hydrogen conductivity meter often fails, and the qualified rate of on-line sodium meters is low and cannot be referenced. During daily operation, there are often situations where the on-line hydrogen conductivity is slightly excessive but the hardness and silicon do not change significantly, and it is basically impossible to judge the reason for the slight excess of hydrogen conductivity. The power plant does not have relevant professional equipment and lacks experienced professional technicians. Even after outsourcing the inspection of the total organic carbon content, the true abnormal reason still cannot be diagnosed in time. As a result, the unit runs with hidden troubles for a long time, and it is found that the blades of the low-pressure rotor are severely corroded during the overhaul of the cylinder. This power plant urgently needs a condensate hydrogen conductivity excess diagnosis system as described in this application.

[0031] The condensate hydrogen conductivity over-standard diagnosis system and method according to the embodiments of the present invention can help thermal power generation enterprises quickly diagnose the specific reasons for abnormal condensate. The entire diagnosis process takes less than 5 minutes, and the system modules are automatically put into operation or withdrawn according to the diagnosis requirements, realizing an automatic, efficient, accurate, reliable and energy-saving remote intelligent diagnosis mode. Relevant professionals can quickly respond and process according to the diagnosis conclusions and suggestions. Even if technicians do not have rich on-site experience, they can quickly and accurately handle the problem of over-standard condensate hydrogen conductivity, which can greatly reduce the entry of unqualified condensate into the thermal system, reduce the probability of major equipment accidents caused by corrosion and scaling, and ensure the safe and stable operation of equipment.

[0032] As Figure 1 shown, the embodiments of the present invention provide a condensate hydrogen conductivity over-standard diagnosis system, including a sampling component, a cation exchanger 5, a degassing device 10, a conductivity meter 12, a total organic carbon analyzer 15 and a control system; the sampling component is connected to the cation exchanger 5 and the total organic carbon analyzer 15 respectively through pipelines, and is used for sampling the condensate of the generator set and transporting the sampled condensate to the cation exchanger 5 and the total organic carbon analyzer 15 respectively; the cation exchanger 5 is used for removing cations in the condensate; the degassing device 10 has an inlet end connected to the cation exchanger 5 through a pipeline and is used for degassing the received condensate; the conductivity meter 12 is connected to the outlet end of the degassing device 10 and the outlet end of the cation exchanger 5 respectively, and is used for detecting the hydrogen conductivity value of the condensate output by the cation exchanger 5 and the degassed hydrogen conductivity value of the condensate after degassing by the degassing device 10; the total organic carbon analyzer 15 is used for detecting the total organic carbon value of the condensate; the control system is connected to the conductivity meter 12 and the total organic carbon analyzer 15 respectively, obtains the hydrogen conductivity value, the degassed hydrogen conductivity value and the total organic carbon value by controlling the operation of the sampling component, the cation exchanger 5, the degassing device 10, the conductivity meter 12 and the total organic carbon analyzer 15, diagnoses whether the condensate hydrogen conductivity is abnormal according to one or more of the hydrogen conductivity value, the degassed hydrogen conductivity value and the total organic carbon value, and determines the abnormal reason when the condensate hydrogen conductivity is abnormal.

[0033] Specifically, the degassing device 10 can adopt any one of the boiling method, the vacuum method or the nitrogen purging method for degassing.

[0034] The conductivity meter 12 adopts an on-line meter, which is convenient for the control system to collect and control data. The conductivity meter 12 includes an electrode and a meter head, and can measure the on-line conductivity alone. After the condensate enters the cation exchanger 5, it has two outputs. One output directly enters the conductivity meter 12, and the hydrogen conductivity value is measured through the conductivity meter 12. The other output enters the conductivity meter 12 after being degassed by the degassing device 10, and the degassed hydrogen conductivity value is measured through the conductivity meter 12. Among them, the two outputs of the cation exchanger 5 can be controlled and switched by the control system outputting instructions.

[0035] The total organic carbon analysis meter 15 is an on-line meter, which facilitates data acquisition and control by the control system. The total organic carbon analysis meter 15 can detect the total organic carbon value of the condensate water and send it to the control system.

[0036] There are three operation modes for the injection assembly, cation exchanger 5, deaeration device 10, conductivity meter 12 and total organic carbon analysis meter 15 to respectively obtain the hydrogen conductivity value, deaerated hydrogen conductivity value and total organic carbon value. Specifically, in the first mode, the control system controls the condensate water sampled through the injection assembly to directly enter the conductivity meter 12 after passing through the cation exchanger 5 to detect the hydrogen conductivity value;

[0037] In the second mode, the control system controls the condensate water sampled through the injection assembly to enter the deaeration device 10 for deaeration after passing through the cation exchanger 5, and then enters the conductivity meter 12 to detect the deaerated hydrogen conductivity value; in the first mode, the control system controls the condensate water sampled through the injection assembly to enter the total organic carbon analysis meter 15 to detect the total organic carbon value.

[0038] The control system diagnoses whether the hydrogen conductivity of the condensate water is abnormal based on one or more of the hydrogen conductivity value, deaerated hydrogen conductivity value and total organic carbon value through a preset judgment logic, and determines the cause of the abnormality when the hydrogen conductivity of the condensate water is abnormal.

[0039] In an example, the control system includes a computer, and the final processing result can be output on the computer display screen, and corresponding processing suggestions can also be given according to the cause of the abnormality, realizing rapid and intelligent diagnosis of the over-standard hydrogen conductivity of the condensate water.

[0040] The control system can also be combined with on-line intelligent diagnosis technologies for abnormal water-vapor indexes such as over-standard hydrogen conductivity of feed water and steam and abnormal water quality of boiler water. At the same time, intelligent feed water and boiler water dosing regulation can be realized through the diagnosis results, further improving the diagnosis efficiency and accuracy of abnormal water-vapor indexes and regulating water treatment dosing.

[0041] A diagnosis system for over-standard hydrogen conductivity of condensate water according to an embodiment of the present invention can, by controlling the operation conditions of the injection assembly, cation exchanger 5, deaeration device 10, conductivity meter 12 and total organic carbon analysis meter 15 through the control system, successively obtain the hydrogen conductivity value of the condensate water before deaeration, the deaerated hydrogen conductivity value of the deaerated condensate water and the total organic carbon value of the generator set, and then diagnose whether the hydrogen conductivity of the condensate water is abnormal based on one or more of the hydrogen conductivity value, deaerated hydrogen conductivity value and total organic carbon value, and determine the cause of the abnormality when the hydrogen conductivity of the condensate water is abnormal, realizing rapid and intelligent diagnosis of the over-standard hydrogen conductivity of the condensate water, greatly improving the diagnosis efficiency and accuracy of abnormal water-vapor, and reducing the dependence on the technical capabilities and experience of technical personnel in power generation enterprises.

[0042] In some embodiments, the sampling assembly includes a sampling tube 1, and the condensate hydrogen conductivity over-standard diagnosis system further includes a first three-way valve 2 and a second three-way valve 7; one interface of the first three-way valve 2 is connected to the sampling tube 1, and the other two interfaces of the first three-way valve 2 are respectively connected to the inlet end of the cation exchanger 5 and the total organic carbon analyzer 15 through pipelines; the three interfaces of the second three-way valve 7 are respectively connected to the outlet end of the cation exchanger 5, the inlet end of the deaeration device 10 and the conductivity meter 12 through pipelines; the control system is respectively connected to the first three-way valve 2 and the second three-way valve 7 to control the operating states of the first three-way valve 2 and the second three-way valve 7.

[0043] Further, the control system includes a PLC control cabinet 13 and a computer device 14; the PLC control cabinet 13 is respectively connected to the first three-way valve 2, the second three-way valve 7 and the conductivity meter 12, and is used to control the operating states of the first three-way valve 2 and the second three-way valve 7 according to the mode instruction output by the computer device 14 and obtain the hydrogen conductivity value and the deaerated hydrogen conductivity value detected by the conductivity meter 12; the computer device 14 is respectively connected to the PLC control cabinet 13 and the total organic carbon analyzer 15, and is used to generate a mode switching instruction and send it to the PLC control cabinet 13, receive the hydrogen conductivity value and the deaerated hydrogen conductivity value sent by the PLC control cabinet 13 and obtain the total organic carbon value detected by the total organic carbon analyzer 15, diagnose whether the condensate hydrogen conductivity is abnormal according to one or more of the hydrogen conductivity value, the deaerated hydrogen conductivity value and the total organic carbon value, and determine the abnormal cause when the condensate hydrogen conductivity is abnormal.

[0044] Specifically, both the first three-way valve 2 and the second three-way valve 7 adopt electromagnetic three-way valves.

[0045] By setting the first three-way valve 2 and the second three-way valve 7, the hydrogen conductivity value of the condensate can be detected by the conductivity meter 12 first. When the hydrogen conductivity value of the condensate is diagnosed as normal, the deaeration device 10 and the total organic carbon analyzer 15 automatically stop operating. When the hydrogen conductivity value of the condensate exceeds the standard, the deaeration device 10 is automatically started and the deaerated hydrogen conductivity value is detected by the conductivity meter 12. Further judgment is made by combining the hydrogen conductivity value and the deaerated hydrogen conductivity value. For example, if the leakage cause such as condenser leakage is diagnosed, the total organic carbon analyzer 15 is not started. If the cause is not diagnosed, the total organic carbon analyzer 15 is put into operation by controlling the first three-way valve 2 and the second three-way valve 7 for final diagnosis. If only a slight leakage of the condenser occurs, it can be determined within 3 minutes, and the entire diagnosis system operates fully automatically, having the effects of intelligence, high efficiency and energy saving.

[0046] In some embodiments, the cation exchanger 5 adopts an electrically automatic regeneration cation exchanger 5.

[0047] Compared with the ion exchange resin used in ordinary on-line hydrogen conductivity meters that needs to be regenerated regularly, the electric automatic regeneration cation exchanger 5 can continuously remove cations and reach a state of automatic regeneration without failure, avoiding the current situation where the frequent failure of hydrogen conductivity ion exchange resin affects diagnosis.

[0048] An embodiment of the present invention also provides a method for diagnosing excessive hydrogen conductivity of condensate water, which is applied to the excessive hydrogen conductivity diagnosis system of the above embodiment, as Figure 2 shown. The method includes:

[0049] Step S201, generate a first mode instruction, and based on the first mode instruction, control the cation exchanger 5 and the conductivity meter 12 to start running. The condensate water passes through the sampling assembly and the cation exchanger 5 in sequence and enters the conductivity meter 12, and the hydrogen conductivity value of the condensate water is obtained through the conductivity meter 12.

[0050] Specifically, send the first mode instruction to the PLC control cabinet 13, and based on the first mode instruction, control the operating states of the first three-way valve 2 and the second three-way valve 7 through the PLC control cabinet 13, so that the condensate water passes through the sampling assembly, the first three-way valve 2, the cation exchanger 5 and the second three-way valve 7 in sequence and enters the conductivity meter 12, and the hydrogen conductivity value of the condensate water is obtained through the conductivity meter 12.

[0051] Step S202, diagnose whether the hydrogen conductivity of the condensate water has a first abnormality based on the hydrogen conductivity value. If there is no first abnormality, the hydrogen conductivity of the condensate water is normal. If there is a first abnormality, generate a second mode instruction, and based on the second mode instruction, control the degassing device 10 to start running. The condensate water passes through the sampling assembly, the cation exchanger 5 and the degassing device 10 in sequence and enters the conductivity meter 12, and the degassed hydrogen conductivity value of the condensate water after being degassed by the degassing device 10 is obtained through the conductivity meter 12.

[0052] Specifically, compare the magnitudes of the hydrogen conductivity value, the first set value and the second set value. If the hydrogen conductivity value is less than or equal to the first set value, there is no second abnormality. If the hydrogen conductivity value is greater than the first set value and less than or equal to the second set value, there is a first abnormality.

[0053] Send the second mode instruction to the PLC control cabinet 13 and control the degassing device 10 to start running. Based on the second mode instruction, control the operating states of the first three-way valve 2 and the second three-way valve 7 through the PLC control cabinet 13, so that the condensate water passes through the sampling assembly, the first three-way valve 2, the cation exchanger 5, the degassing device 10 and the second three-way valve 7 in sequence and enters the conductivity meter 12, and the degassed hydrogen conductivity value of the condensate water after being degassed by the degassing device 10 is obtained through the conductivity meter 12.

[0054] Step S203: Based on the deaerated hydrogen conductivity value, diagnose whether the condensate hydrogen conductivity has a second anomaly. If there is a second anomaly, determine that the cause of the anomaly is condenser leakage. If there is no second anomaly, generate a third-mode instruction, and based on the third-mode instruction, control the total organic carbon analyzer 15 to start running. The condensate passes through the sampling assembly and enters the total organic carbon analyzer 15, and the total organic carbon value of the condensate is obtained through the total organic carbon analyzer 15.

[0055] Specifically, compare the magnitudes of the deaerated hydrogen conductivity value, the third set value, and the fourth set value. If the deaerated hydrogen conductivity value is less than or equal to the third set value, there is no second anomaly. If the hydrogen conductivity value is greater than the third set value and less than or equal to the fourth set value, there is a second anomaly.

[0056] Send the third-mode instruction to the PLC control cabinet 13 and control the total organic carbon analyzer 15 to start running. Based on the third-mode instruction, the PLC control cabinet 13 controls the operating states of the first three-way valve 2 and the second three-way valve 7, so that the condensate passes through the sampling assembly and the first three-way valve 2 in sequence and enters the total organic carbon analyzer 15, and the total organic carbon value of the condensate is obtained through the total organic carbon analyzer 15.

[0057] Step S204: Based on the total organic carbon value, diagnose whether the condensate hydrogen conductivity has a third anomaly. If there is no third anomaly, determine that the cause of the anomaly is poor condenser vacuum. If there is a third anomaly, determine that the cause of the anomaly is high total organic carbon content in the make-up water.

[0058] Specifically, compare the magnitudes of the total organic carbon value and the fifth set value. If the total organic carbon value is less than or equal to the fifth set value, there is no third anomaly. If the total organic carbon value is greater than the fifth set value, there is a third anomaly.

[0059] Furthermore, when the cause of the anomaly is a condenser fault such as poor condenser vacuum or condenser leakage, the computer device 14 outputs an alarm signal, and presents the cause of the fault and the treatment suggestions through the display screen of the computer device 14. All technical personnel and management personnel of the power generation enterprise can remotely view it through data access. For example, in case of condenser leakage or poor condenser vacuum, the turbine personnel can directly view the determination result and handle it, without the need for chemical personnel to track and sample for testing multiple times, and some even need to outsource the detection and then make an artificial judgment by combining online and offline data.

[0060] In an example, the first set value is 0.3 μS / cm, the second set value is 1 μS / cm, the third set value is 0.3 μS / cm, the fourth set value is 1 μS / cm, and the fifth set value is 400 / (N×100), where N is the make-up water rate. When setting, the make-up water rate data of the production monitoring platform of the power generation enterprise can be accessed. The following uses a specific example to illustrate the method for diagnosing excessive condensate hydrogen conductivity.

[0061] First step, adjust the first three-way valve 2 so that the condensate water sample first flows through the sampling pipe 1, the first three-way valve 2 and the first pipeline 3 into the cation exchanger 5. After removing the cations, it flows out from the second pipeline 6, is adjusted by the second three-way valve 7, and enters the conductivity meter 12 through the third pipeline 8. The measured conductivity data is transmitted to the computer device 14 through the PLC control cabinet 13, and after logical judgment by the software system, the diagnostic result is displayed on the display screen of the computer device 14. At this time, the data measured by the conductivity meter 12 is the hydrogen conductivity value CC of the condensate water. If the hydrogen conductivity value CC is less than or equal to 0.3 μS / cm, it is diagnosed as normal operation, the condensate water does not pass through the fourth pipeline 4 and the fifth pipeline 9, and the degassing device 10 and the total organic carbon analyzer 15 are not put into operation.

[0062] Second step, if the hydrogen conductivity value CC is greater than 0.3 μS / cm and less than or equal to 1 μS / cm, the PLC control cabinet 13 controls the second three-way valve 7, and the third pipeline 8 is closed. The water sample coming out of the cation exchanger 5 flows into the degassing device 10 through the fifth pipeline 9. At this time, the degassing device 10 is automatically put into operation. The degassing device 10 can use the boiling method, the vacuum method or the nitrogen purging method for degassing. The degassed water sample enters the conductivity meter 12 through the sixth pipeline 11. At this time, the data measured by the conductivity meter 12 is the degassed hydrogen conductivity value DCC of the condensate water. The measured conductivity data is transmitted to the computer device 14 through the PLC control cabinet 13. If 0.3 μS / cm < DCC ≤ 1 μS / cm, the computer device 14 will determine that the condenser is leaking and display the diagnostic result on the display. The turbine professional of the power plant can perform on-line leak detection and plugging according to the result. At this time, the total organic carbon analyzer 15 remains in the non-operating state.

[0063] Third step, if the hydrogen conductivity value CC is greater than 0.3 μS / cm and less than 1 μS / cm, and the degassed hydrogen conductivity value DCC is less than or equal to 0.3 μS / cm, the PLC control cabinet 13 will control the first three-way valve 2 to act, so that the condensate water enters the total organic carbon analyzer 15 through the first three-way valve 2 and the fourth pipeline 4. At this time, the total organic carbon analyzer 15 is automatically put into operation. If TOC ≤ 400 / (N×100) at this time, the computer device 14 diagnoses that the condenser vacuum is not tight and displays the diagnostic result on the display. The turbine professional can process the condenser according to the diagnostic result.

[0064] Step 4: If the hydrogen conductivity value CC is greater than 0.3 μS / cm and less than 1 μS / cm, and the degassed hydrogen conductivity value DCC is less than or equal to 0.3 μS / cm, the PLC control cabinet 13 will control the first three-way valve 2 to act, so that the condensate enters the total organic carbon analyzer 15 through the first three-way valve 2 and the fourth pipeline 4. At this time, the total organic carbon analyzer 15 is automatically put into operation. If TOC > 400 / (N×100) at this time, the computer device 14 diagnoses that the total organic carbon content of the make-up water is high, and the chemical specialty adjusts the water treatment according to the diagnosis result to reduce the introduction of organic matter.

[0065] All the above devices operate automatically. The staff can read the diagnosis result when the hydrogen conductivity of the condensate is abnormal from the computer device 14 within 5 minutes and make corresponding treatments, which greatly shortens the diagnosis time and the risk of manual investigation, and avoids a large amount of deteriorated water quality from entering the thermal system, causing corrosion, scaling, and salt accumulation on thermal equipment such as blades and four pipes.

[0066] The method for diagnosing the excessive hydrogen conductivity of condensate in the present invention diagnoses the cause of the excessive hydrogen conductivity of condensate by combining the hydrogen conductivity value, the degassed hydrogen conductivity value, and the total organic carbon value, which can help thermal power generation enterprises quickly and accurately diagnose the specific cause of condensate abnormality. The relevant specialty can quickly respond and handle according to the diagnosis conclusion and suggestions. Even if the technical personnel do not have rich on-site experience, they can quickly and accurately handle the problem of excessive hydrogen conductivity of condensate, greatly improving the diagnosis efficiency and accuracy of water vapor abnormality and reducing the dependence on the technical ability and experience of technical personnel in power generation enterprises.

[0067] The method for diagnosing the excessive hydrogen conductivity of condensate in the present invention first detects the hydrogen conductivity value of the condensate through the conductivity meter 12. When the hydrogen conductivity value of the condensate is diagnosed as normal, the degassing device 10 and the total organic carbon analyzer 15 automatically exit the operation. When the hydrogen conductivity value of the condensate exceeds the standard, the degassing device 10 is automatically started and the degassed hydrogen conductivity value is detected through the conductivity meter 12. Further judgment is made by combining the hydrogen conductivity value and the degassed hydrogen conductivity value. If the cause of leakage such as condenser leakage is diagnosed, the total organic carbon analyzer 15 is not started. If the cause is not diagnosed, the total organic carbon analyzer 15 is put into operation through controlling the first three-way valve 2 and the second three-way valve 7 for final diagnosis. If only a slight leakage of the condenser occurs, it can be judged within 3 minutes. The entire diagnostic system operates automatically, and there is no need to operate the degassing device 10 and the total organic carbon analyzer 15 every time for diagnosis, which has the effects of intelligence, high efficiency, and energy saving.

[0068] The method for diagnosing the excessive hydrogen conductivity of condensate in the present invention can greatly reduce the unqualified condensate from entering the thermal system, reduce the probability of major equipment accidents caused by corrosion and scaling, and ensure the safe and stable operation of the equipment.

[0069] Generally speaking, the present invention provides a novel, practical, sensitive and reliable diagnosis system and method for the excessive hydrogen conductivity of condensate water, providing a strong guarantee for the safe operation of thermal power generation enterprises.

[0070] It should be noted that the implementation of the present invention is not limited to the type of thermal power generation units. It can be widely applied to the situation of slightly excessive hydrogen conductivity of condensate water in gas turbines or coal-fired units, providing strong support for improving the safety and stability of power generation equipment.

[0071] The present invention also provides a computer device 14, as Figure 3 shown. The computer device 14 includes: one or more processors, a memory, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Each component communicates with each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device 14, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices 14 can be connected, and each device provides part of the necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 3 One processor is taken as an example in

[0072] The processor can be a central processing unit, a network processor, or a combination thereof. Among them, the processor can further include a hardware chip. The above hardware chip can be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above programmable logic device can be a complex programmable logic device, a field programmable gate array, a general array logic, or any combination thereof.

[0073] Among them, the memory stores instructions executable by at least one processor, so that at least one processor executes the method shown in the above embodiments.

[0074] The memory may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the computer device 14, etc. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory may optionally include a memory remotely provided relative to the processor, and these remote memories can be connected to the computer device 14 through a network. Examples of the above-mentioned network include but are not limited to the Internet, intranet, local area network, mobile communication network, and combinations thereof.

[0075] The memory may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk, or solid-state drive; the memory may further include a combination of the above types of memory.

[0076] The computer device 14 further includes an input device and an output device. The processor, memory, input device, and output device can be connected through a bus or other means, Figure 3 taking the connection through the bus as an example.

[0077] The input device can receive input digital or character information, and generate key signal inputs related to the user settings and function control of the computer device 14, such as a touch screen, keypad, mouse, trackpad, touchpad, pointing stick, one or more mouse buttons, trackball, joystick, etc. The output device may include a display device, auxiliary lighting device (e.g., LED), and tactile feedback device (e.g., vibration motor), etc. The above-mentioned display device includes but is not limited to liquid crystal display, light-emitting diode, display, and plasma display. In some alternative embodiments, the display device may be a touch screen.

[0078] Although the example embodiments and their advantages have been described in detail, those skilled in the art can make various changes, substitutions, and modifications to these embodiments without departing from the spirit of the present invention and the defined protection scope, and such modifications and variations all fall within the defined scope.

Claims

1. A condensed water hydrogen conductivity excessive diagnosis system, characterized in that: It includes a sample injection assembly, a cation exchanger, a degasser, a conductivity meter, a total organic carbon analysis meter and a control system; The sampling assembly is connected to the cation exchanger and the total organic carbon analysis meter through pipelines, and is used to sample the condensate of the generator set and transport the sampled condensate to the cation exchanger and the total organic carbon analysis meter respectively; The cation exchanger is used to remove cations in the condensed water; The degassing device, the inlet end of which is connected to the cation exchanger through a pipeline, is used to degas the received condensate; A conductivity meter, connected to the outlet end of the degassing device and the outlet end of the cation exchanger, respectively, for detecting the hydrogen conductivity value of the condensed water output by the cation exchanger and the degassed hydrogen conductivity value of the condensed water after degassing by the degassing device; The total organic carbon analysis table is used to detect the total organic carbon value of condensed water; The control system is connected to the conductivity meter and the total organic carbon analysis meter, respectively, and obtains the hydrogen conductance value, the degassed hydrogen conductance value and the total organic carbon value by controlling the operation of the sampling assembly, the cation exchanger, the degassing device, the conductivity meter and the total organic carbon analysis meter. Whether the hydrogen conductivity of the condensed water is abnormal is diagnosed based on one or more of the hydrogen conductance value, the degassed hydrogen conductance value and the total organic carbon value, and the cause of the abnormality is determined when the hydrogen conductivity of the condensed water is abnormal.

2. The condensed water hydrogen conductivity excessive diagnosis system according to claim 1 is characterized in that: The sampling assembly includes a sampling tube, and the condensed water hydrogen conductivity excessive diagnosis system also includes a first three-way valve and a second three-way valve; One interface of the first three-way valve is connected to the sample injection tube, and the other two interfaces of the first three-way valve are connected to the inlet end of the cation exchanger and the total organic carbon analysis meter through pipelines respectively; The three interfaces of the second three-way valve are respectively connected to the outlet end of the cation exchanger, the inlet end of the degassing device and the conductivity meter through pipelines; The control system is connected to the first three-way valve and the second three-way valve respectively to control the operating states of the first three-way valve and the second three-way valve.

3. The condensed water hydrogen conductivity excessive diagnosis system according to claim 2 is characterized in that: The control system includes a PLC control cabinet and computer equipment; The PLC control cabinet is connected to the first three-way valve, the second three-way valve and the conductivity meter, respectively, and is used to control the operating states of the first three-way valve and the second three-way valve according to the mode instruction output by the computer device and obtain the hydrogen conductivity value and the degassed hydrogen conductivity value detected by the conductivity meter; The computer device is connected to the PLC control cabinet and the total organic carbon analysis table respectively, and is used to generate a mode switching instruction and send it to the PLC control cabinet, receive the hydrogen conductance value and the degassed hydrogen conductance value sent by the PLC control cabinet and obtain the total organic carbon value detected by the total organic carbon analysis table, diagnose whether the condensate hydrogen conductivity is abnormal according to one or more of the hydrogen conductance value, the degassed hydrogen conductance value and the total organic carbon value, and determine the cause of the abnormality when the condensate hydrogen conductivity is abnormal.

4. The condensed water hydrogen conductivity excessive diagnosis system according to claim 1 is characterized in that: The cation exchanger is an electrically automatically regenerated cation exchanger.

5. A method for diagnosing excessive hydrogen conductivity of condensed water, applied to the system for diagnosing excessive hydrogen conductivity of condensed water as claimed in any one of claims 1 to 4, characterized in that: include: Generate a first mode instruction, control the cation exchanger and the conductivity meter to start running based on the first mode instruction, the condensed water sequentially passes through the sampling component and the cation exchanger and enters the conductivity meter, and obtains the hydrogen conductivity value of the condensed water through the conductivity meter; Based on the hydrogen conductance value, diagnose whether a first abnormality occurs in the hydrogen conductance of the condensed water; if the first abnormality does not occur, the hydrogen conductance of the condensed water is normal; if the first abnormality occurs, generate a second mode instruction, and control the degassing device to start running based on the second mode instruction, so that the condensed water passes through the sampling component, the cation exchanger and the degassing device in sequence and enters the conductivity meter, and obtains the degassed hydrogen conductance value of the condensed water after being degassed by the degassing device through the conductivity meter; Based on the degassed hydrogen conductance value, diagnose whether a second abnormality occurs in the hydrogen conductance of the condensed water; if the second abnormality occurs, determine that the abnormality is caused by a condenser leak; if the second abnormality does not occur, generate a third mode instruction; based on the third mode instruction, control the total organic carbon analysis table to start running, and the condensed water enters the total organic carbon analysis table through the sampling component, and obtains the total organic carbon value of the condensed water through the total organic carbon analysis table; Based on the total organic carbon value, it is diagnosed whether the third abnormality of the condensed water hydrogen conductivity occurs. If the third abnormality does not occur, it is determined that the cause of the abnormality is the loose vacuum of the condenser. If the third abnormality occurs, it is determined that the cause of the abnormality is the high total organic carbon content of the make-up water.

6. The method for diagnosing excessive condensate hydrogen conductivity according to claim 5, characterized in that: Based on the first mode instruction, the cation exchanger and the conductivity meter are controlled to start running, the condensed water sequentially passes through the sampling component and the cation exchanger and enters the conductivity meter, and the hydrogen conductivity value of the condensed water is obtained through the conductivity meter, including: The first mode instruction is sent to the PLC control cabinet, and the PLC control cabinet controls the operating status of the first three-way valve and the second three-way valve based on the first mode instruction, so that the condensed water passes through the injection component, the first three-way valve, the cation exchanger and the second three-way valve in sequence and enters the conductivity meter, and the hydrogen conductivity value of the condensed water is obtained through the conductivity meter.

7. The method for diagnosing excessive condensed water hydrogen conductivity according to claim 5, characterized in that: Based on the second mode instruction, the degassing device is controlled to start running, the condensed water passes through the sampling assembly, the cation exchanger and the degassing device in sequence and enters the conductivity meter, and the degassed hydrogen conductivity value of the condensed water after being degassed by the degassing device is obtained through the conductivity meter, including: The second mode instruction is sent to the PLC control cabinet and controls the degassing device to start running. The PLC control cabinet controls the operating status of the first three-way valve and the second three-way valve based on the second mode instruction, so that the condensed water passes through the injection component, the first three-way valve, the cation exchanger, the degassing device and the second three-way valve in sequence and enters the conductivity meter. The degassed hydrogen conductivity value of the condensed water after being degassed by the degassing device is obtained through the conductivity meter.

8. The method for diagnosing excessive condensed water hydrogen conductivity according to claim 5, characterized in that: Based on the third mode instruction, the total organic carbon analysis table is controlled to start running, the condensed water enters the total organic carbon analysis table through the sampling component, and the total organic carbon value of the condensed water is obtained through the total organic carbon analysis table, including: The third mode instruction is sent to the PLC control cabinet and controls the total organic carbon analysis table to start running. The PLC control cabinet controls the operating states of the first three-way valve and the second three-way valve based on the third mode instruction, so that the condensed water passes through the injection component and the first three-way valve in sequence and enters the total organic carbon analysis table. The total organic carbon value of the condensed water is obtained through the total organic carbon analysis table.

9. The method for diagnosing excessive condensed water hydrogen conductivity according to claim 5, characterized in that: Diagnosing whether a first abnormality occurs in the hydrogen conductivity of condensed water based on the hydrogen conductivity value includes: Comparing the hydrogen conductivity value, the first set value and the second set value, if the hydrogen conductivity value is less than or equal to the first set value, the second abnormality does not occur, if the hydrogen conductivity value is greater than the first set value and less than or equal to the second set value, the first abnormality occurs; And / or, diagnosing whether a second abnormality occurs in the hydrogen conductivity of condensed water based on the degassed hydrogen conductivity value, comprising: Comparing the degassed hydrogen conductivity value, the third set value, and the fourth set value, if the degassed hydrogen conductivity value is less than or equal to the third set value, the second abnormality does not occur, and if the hydrogen conductivity value is greater than the third set value and less than or equal to the fourth set value, the second abnormality occurs; And / or, diagnosing whether a third abnormality occurs in the condensed water hydrogen conductivity based on the total organic carbon value, including: The total organic carbon value is compared with the fifth set value. If the total organic carbon value is less than or equal to the fifth set value, the third abnormality does not occur. If the total organic carbon value is greater than the fifth set value, the third abnormality occurs.

10. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for diagnosing excessive hydrogen conductivity of condensed water as claimed in any one of claims 5 to 9 by executing the computer instructions.

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