Water vapor sampling device and pollution discharge method thereof

Abstract

The invention belongs to the technical field of water vapor sampling, and discloses a water vapor sampling device and a pollution discharge method thereof. An inlet of the sampling pipeline is connected with a preset sampling point of the water vapor system, and two paths of outlets are formed in the sampling pipeline; wherein the first path is connected with an inlet of the sampling main water path, and the second path is connected with an inlet of the automatic pollution discharge water path; the electric blow-down valve and the temperature controller are connected in series to the automatic blow-down water path, and the online chemical instrument is arranged on the sampling main water path; the output end of the temperature controller and the output end of the online chemical instrument are connected with the input end of the control system, and the output end of the control system is connected with the control end of the electric blow-down valve. According to the water vapor sampling device disclosed by the invention, by arranging the automatic pollution discharge waterway with the electric pollution discharge valve, the automatic pollution discharge operation of the water vapor sampling device is realized by opening or closing the electric pollution discharge valve, the pollution discharge process is high in safety and good in timeliness, and the waste of high-quality water vapor can be avoided, so that the accuracy of a water vapor sampling monitoring result is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of water vapor sampling, and in particular relates to a water vapor sampling device and a sewage discharge method thereof. Background Art

[0002] The water vapor sampling device is used to cool and reduce the pressure of water samples at each sampling point in the water vapor system, and provide online chemical instruments with measurement water samples that are suitable for temperature, flow and pressure. It is an important equipment to ensure accurate monitoring of water vapor quality during unit operation. Since the sampling points of the water vapor system are generally set on the pipelines of the water vapor system and connected to the sampling pipeline in the water vapor sampling device, and the sampling pipeline is usually long and has a small aperture, corrosion products during the operation of the unit are deposited in the sampling pipeline, which in turn causes the sampling results to lose representativeness. Therefore, it is necessary to drain the water samples to remove impurities deposited in the sampling pipeline to avoid affecting the subsequent sampling and monitoring results.

[0003] At present, the existing water vapor sampling devices usually adopt the manual sewage discharge method, that is, manually opening the sewage valve at regular intervals to discharge sewage; however, the existing sewage discharge process has the following technical problems: high safety risks and large waste of water samples; specifically: (1) The working fluid in the water vapor sampling device is high-temperature and high-pressure water vapor, and there is a great safety risk when manually operating the sewage valve; (2) Manual sewage discharge cannot be carried out in a targeted manner according to the actual water quality conditions, which is easy to cause a large amount of pure water vapor to be wasted; at the same time, there is a phenomenon of failure to discharge sewage in time when the water quality deteriorates, resulting in distortion of subsequent instrument monitoring results. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a water vapor sampling device and a sewage discharge method thereof, so as to solve the technical problems that the sewage discharge process of the existing water vapor sampling device has high safety risks and large waste of water samples.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] The present invention provides a water vapor sampling device, comprising a sampling pipeline, a sampling main water channel, an automatic sewage drainage channel, an electric sewage drainage valve, a temperature controller, an online chemical instrument and a control system; the inlet of the sampling pipeline is connected to a preset sampling point of a water vapor system, and the outlet of the sampling pipeline is provided with two channels; wherein the first channel is connected to the inlet of the sampling main water channel, and the second channel is connected to the inlet of the automatic sewage drainage channel; the electric sewage drainage valve and the temperature controller are connected in series to the automatic sewage drainage channel, and the online chemical instrument is provided on the sampling main water channel; the output ends of the temperature controller and the online chemical instrument are both connected to the input end of the control system, and the output end of the control system is connected to the control end of the electric sewage drainage valve;

[0007] The temperature controller is used to collect temperature data in the automatic sewage drainage channel; the online chemical instrument is used to collect preset water sample index data in the sampling main water channel; the control system is used to generate and send a timed sewage discharge control signal to the electric sewage discharge valve, and is also used to generate and send an abnormal sewage discharge alarm signal according to the temperature data in the automatic sewage drainage channel, and is also used to generate and send an automatic sewage discharge control signal to the electric sewage discharge valve according to the preset water sample index data in the sampling main water channel; wherein, the timed sewage discharge control signal is used to trigger the electric sewage discharge valve to open or close at a time, and the automatic sewage discharge control signal is used to trigger the electric sewage discharge valve to open or close dynamically.

[0008] Furthermore, it also includes a sewage bypass and a manual sewage valve; the outlet of the sampling pipeline is also provided with a third path, and the third path is connected to the inlet of the sewage bypass; the manual sewage valve is arranged on the sewage bypass, and the manual sewage valve is in a normally closed state.

[0009] Furthermore, it also includes a primary stop valve and a secondary stop valve; the primary stop valve and the secondary stop valve are connected in series to the sampling pipeline in sequence.

[0010] Furthermore, it also includes a manual stop valve, which is arranged on the automatic sewage drainage line and located between the temperature controller and the outlet of the automatic sewage drainage line.

[0011] Furthermore, the manual stop valve is in a normally open state.

[0012] Furthermore, it also includes a water sample cooling and pressure reduction device; the water sample cooling and pressure reduction device is arranged on the sampling main water channel and is located between the entrance of the sampling main water channel and the online chemical instrument; wherein the water sample cooling and pressure reduction device is used to cool and reduce the pressure of the water sample in the sampling main water channel.

[0013] Furthermore, the online chemical instrument adopts a hydrogen conductivity meter or an online iron meter.

[0014] Furthermore, the preset sampling points of the water vapor system are the condensate pump outlet, the deaerator inlet, the deaerator outlet, the economizer inlet, the main steam sampling point, the reheat steam sampling point or the high pressure heater drain sampling point.

[0015] Furthermore, the control system is a PLC controller or a DCS control system.

[0016] The present invention also provides a method for discharging pollutants from a water vapor sampling device, comprising:

[0017] Compare the current time with the preset time to determine whether the preset time has arrived;

[0018] When the timing time arrives, a timing sewage discharge control signal is generated and sent to the electric sewage discharge valve, triggering the electric sewage discharge valve to open, so as to perform the current round of timing sewage discharge through the automatic sewage discharge channel;

[0019] Determine whether the opening time of the electric sewage discharge valve reaches the preset sewage discharge time; if so, regenerate the timed sewage discharge control signal to trigger the electric sewage discharge valve to close, so as to complete the current round of timed sewage discharge operation;

[0020] Collecting preset water sample index data in the sampling main waterway, generating and sending an automatic sewage discharge control signal according to the preset water sample index data in the sampling main waterway, triggering the electric sewage discharge valve to automatically open, so as to automatically discharge sewage through the automatic sewage discharge channel;

[0021] The temperature data in the automatic sewage discharge pipe during the timed sewage discharge process or the automatic sewage discharge process is collected, and an abnormal sewage discharge alarm signal is generated and sent according to the change trend of the temperature data in the automatic sewage discharge pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The water vapor sampling device provided by the present invention is provided with an automatic sewage discharge path with an electric sewage discharge valve, and the automatic sewage discharge operation of the water vapor sampling device is realized by opening or closing the electric sewage discharge valve. The sewage discharge process is highly safe and timely, and can avoid the waste of high-quality water vapor, thereby ensuring the accuracy of the water vapor sampling monitoring result; specifically, a control system is used to send a timed sewage discharge control signal to trigger the electric sewage discharge valve to open or close at a time, thereby realizing the purpose of timed sewage discharge; secondly, a temperature sensor is used to collect temperature data in the automatic sewage discharge path, and according to the change trend of the temperature data in the automatic sewage discharge path, a fault condition of the electric sewage discharge valve can be detected. The system can provide timely warning of the situation and promptly prompt the operator to manually discharge the sewage, thereby improving the reliability of the device; in addition, the electric sewage valve is automatically opened or closed according to the preset water sample index data in the sampling main water channel collected by the online chemical instrument, so as to realize automatic and timely sewage discharge according to the water quality of the water vapor sample, and can effectively ensure the authenticity and accuracy of the water vapor sampling monitoring results; the device of the present invention has a simple structure and is easy to operate. It can effectively exhaust impurities in the water vapor sample while avoiding water vapor waste, thereby reducing sewage discharge energy and water consumption, and helping the unit to save energy, reduce emissions and reduce consumption; it has the advantages of low safety risks, high reliability and easy maintenance.

[0024] Furthermore, by providing a sewage bypass and a manual sewage valve on the sewage bypass, sewage discharge operation requirements in the event of a failure of the electric sewage valve can be met, thereby ensuring the reliability of the water vapor sampling device.

[0025] Furthermore, by providing a manual shut-off valve on the automatic sewage discharge line, the automatic sewage discharge line can be shut off when the electric sewage discharge valve fails, thereby avoiding waste of water samples and ensuring the safety of the water vapor sampling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the overall structure of the water vapor sampling device provided in Example 1;

[0028] Figure 2 This is a schematic diagram of the overall structure of the water vapor sampling device provided in Example 2.

[0029] Among them, 1 sampling pipeline, 2 sampling main water line, 3 automatic sewage line, 4 sewage bypass, 5 primary stop valve, 6 secondary stop valve, 7 electric sewage valve, 8 temperature controller, 9 manual stop valve, 10 manual sewage valve, 11 online chemical instrument, 12 control system. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by this application clearer, the technical solutions in the embodiments of this application will be described clearly and completely in combination with the drawings in the embodiments of this application; obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] Example 1

[0032] As attached Figure 1 As shown, this embodiment 1 provides a water vapor sampling device, including a sampling pipeline 1, a sampling main water circuit 2, an automatic sewage circuit 3, a primary stop valve 5, a secondary stop valve 6, an electric sewage valve 7, a temperature controller 8, a manual stop valve 9, an online chemical instrument 11, a water sample cooling and pressure reduction device and a control system 12.

[0033] The inlet of the sampling pipeline 1 is connected to the preset sampling point of the water vapor system, and the primary stop valve 5 and the secondary stop valve 6 are connected in series to the sampling pipeline 1 in sequence; the primary stop valve 5 and the secondary stop valve 6 are used to control the on-off of the sampling pipeline 1, that is, to control the on-off of the preset sampling point of the water vapor system; wherein the preset sampling point of the water vapor system is the condensate pump outlet, the deaerator inlet, the deaerator outlet, the economizer inlet, the main steam sampling point, the reheat steam sampling point or the high-pressure heater drain sampling point; that is, the water vapor entering the sampling pipeline 1 includes the condensate pump outlet water vapor, the deaerator inlet water vapor, the deaerator outlet water vapor, the economizer inlet water vapor, the main steam water sample, the reheat steam water sample or the high-pressure heater drain water sample.

[0034] The outlet of the sampling pipeline 1 is provided with two paths; wherein the first path is connected to the inlet of the sampling main water path 2 , and the second path is connected to the inlet of the automatic sewage drainage path 3 .

[0035] An online chemical instrument 11 is arranged on the sampling main water channel 2, and the output end of the online chemical instrument 11 is connected to the first input end of the control system 12; wherein, the online chemical instrument 11 is used to collect preset water sample index data in the sampling main water channel 2; preferably, the online chemical instrument 11 adopts a hydrogen conductivity meter or an online iron meter to collect preset water sample index data in the sampling main water channel 2; the water sample cooling and pressure reduction device is arranged on the sampling main water channel 2, and is located between the entrance of the sampling main water channel 2 and the online chemical instrument 11; wherein, the water sample cooling and pressure reduction device is used to cool and reduce the pressure of the water sample in the sampling main water channel 2.

[0036] The electric sewage valve 7, the temperature controller 8 and the manual stop valve 9 are connected in series on the automatic sewage discharge path 3 in sequence; the output end of the temperature controller 8 is connected to the second input end of the control system 12, and the output end of the control system 12 is connected to the control end of the electric sewage valve 7; the electric sewage valve 7 is used for timed opening and closing or automatic opening to realize the automatic sewage discharge function of the automatic sewage discharge path 3; the temperature controller 8 is used to collect temperature data in the automatic sewage discharge path 3; the manual stop valve 9 is used to shut off the automatic sewage discharge path 3 when the electric sewage valve 7 fails; wherein, the manual stop valve 9 is in a normally open state.

[0037] The control system 12 is used to generate and send a timed sewage discharge control signal to the electric sewage valve 7, and the timed sewage discharge control signal is used to trigger the electric sewage valve 7 to open or close at a time to realize the automatic sewage discharge operation of the automatic sewage discharge channel 3; the control system 12 is also used to generate and send an abnormal sewage discharge alarm signal according to the temperature data in the automatic sewage discharge channel 3 to prompt the electric sewage valve 7 to have an abnormal fault; preferably, the abnormal sewage discharge alarm signal includes an audible and visual alarm signal or a pop-up alarm message; the control system 12 is also used to generate and send an automatic sewage discharge control signal to the electric sewage valve 7 according to the preset water sample index data in the sampling main water channel 2, and the automatic sewage discharge control signal is used to trigger the electric sewage valve 7 to automatically open or close; preferably, the control system 12 is a PLC controller or a DCS control system, and the control system 12 pre-stores the timed sewage discharge cycle and the sewage discharge duration corresponding to each timed sewage discharge cycle.

[0038] It should be noted that the control system 12 is used to generate and send a timed sewage discharge control signal to the electric sewage discharge valve 7, and the timed sewage discharge control signal is used to trigger the electric sewage discharge valve 7 to open or close at a time to realize the automatic sewage discharge operation of the automatic sewage discharge channel 3. The specific principle is:

[0039] The control system 12 is used to compare the current moment with the preset timing time to determine whether the preset timing time has been reached; when the timing time has been reached, a timed sewage discharge control signal is generated and sent to the electric sewage discharge valve 7 to trigger the electric sewage discharge valve 7 to open, and then the current round of timed sewage discharge is performed through the automatic sewage discharge line 3; then, it is determined whether the opening time of the electric sewage discharge valve 7 has reached the preset sewage discharge time; if so, the timed sewage discharge control signal is regenerated to trigger the electric sewage discharge valve 7 to close, thereby completing the current round of timed sewage discharge operation.

[0040] It should be noted that the control system 12 is also used to generate and send an automatic sewage discharge control signal to the electric sewage discharge valve 7 according to the preset water sample index data in the sampling main waterway 2. The automatic sewage discharge control signal is used to trigger the process of automatically opening the electric sewage discharge valve 7. The specific principle is:

[0041] (1) When the online chemical instrument 11 is a hydrogen conductivity meter, that is, the preset water sample index in the sampling main water path 2 is the hydrogen conductivity of the water sample, the reading of the hydrogen conductivity meter is compared with the preset water sample hydrogen conductivity threshold; if the reading of the hydrogen conductivity meter exceeds the preset water sample hydrogen conductivity threshold, it is considered that impurities exist in the sampling main water path 2, and at this time, the control system 12 generates and sends an automatic sewage control signal to the electric sewage valve 7 to automatically open; wherein, under normal circumstances, the hydrogen conductivity of the water sample at the preset sampling point of the water vapor system is at the same level, for example, 0.07μS / cm; therefore, the preset water sample hydrogen conductivity threshold can be determined to be 0.07μS / cm.

[0042] (2) When the online chemical instrument 11 is an online iron meter, that is, when the preset water sample indicator in the sampling main water channel 2 is the iron ion content of the water sample, the reading of the online iron meter is compared with the preset threshold value of the iron ion content of the water sample; if the reading of the online iron meter at a certain stage exceeds the preset threshold value of the iron ion content of the water sample, or the iron ion content of a certain water sample is higher than that of other water samples, it is considered that impurities exist in the sampling main water channel 2, and at this time, the control system 12 generates and sends an automatic sewage discharge control signal to the electric sewage discharge valve 7 to automatically open; it should be clear that iron ions are corrosion products generated during the operation of the unit and are very easy to be deposited in the sampling pipeline; therefore, the iron ion content can be used as a standard for judging whether sewage discharge is needed.

[0043] It should be noted that the control system 12 is also used to generate and send an abnormal sewage discharge alarm signal according to the temperature data in the automatic sewage discharge channel 3 to prompt the electric sewage discharge valve 7 to have an abnormal fault. The specific principle is as follows:

[0044] By collecting the temperature data in the automatic sewage discharge channel 3 during the timed sewage discharge process or the automatic sewage discharge process, the temperature change during and after sewage discharge is monitored according to the temperature data in the automatic sewage discharge channel 3 during the timed sewage discharge process or the automatic sewage discharge process. When the temperature does not rise during sewage discharge, it proves that the electric sewage discharge valve 7 has a stuck fault, or when the temperature does not decrease after sewage discharge, it proves that the electric sewage discharge valve 7 has an internal leakage fault. At this time, an abnormal sewage discharge alarm signal is generated and sent to prompt the operator to timely sample the manual sewage discharge method for sewage discharge.

[0045] Working principle:

[0046] The water vapor sampling device described in this embodiment 1, when in use, includes a sampling working mode and a sewage discharge working mode.

[0047] The sampling working mode is specifically as follows: opening the primary stop valve 5 and the secondary stop valve 6, and closing the electric drain valve 7, so that the water sample passes through the cooling and pressure reduction device from the sampling main water channel 2 and enters the online chemical instrument 11 for water quality monitoring.

[0048] The sewage discharge working mode is as follows:

[0049] The electric drain valve 7 and the manual stop valve 9 are opened, and the water sample flows out from the automatic drain water channel 3 to perform the drain operation; after the drain operation is completed, the electric drain valve is closed, and the water sample passes through the cooling and pressure reducing device from the sampling main water channel 2 and enters the online chemical instrument 11 for water quality monitoring; if during the drain operation, it is diagnosed that the electric drain valve 7 has a fault, the manual stop valve 9 is closed, and if drain operation is required, manual drain operation is performed.

[0050] Specifically, the sewage discharge method of the water vapor sampling device includes the following steps:

[0051] (1) Timed sewage discharge process: compare the current time with the preset timing time to determine whether the preset timing time has been reached; when the timing time has been reached, generate and send a timed sewage discharge control signal to the electric sewage discharge valve 7, triggering the electric sewage discharge valve 7 to open, so as to perform the current round of timed sewage discharge through the automatic sewage discharge path 3; determine whether the opening time of the electric sewage discharge valve 7 has reached the preset sewage discharge time; if so, regenerate the timed sewage discharge control signal to trigger the electric sewage discharge valve 7 to close, so as to complete the current round of timed sewage discharge operation.

[0052] (2) Automatic sewage discharge process: Collecting preset water sample index data in the sampling main waterway 2, generating and sending an automatic sewage discharge control signal according to the preset water sample index data in the sampling main waterway 2, triggering the electric sewage discharge valve 7 to open automatically, so as to automatically discharge sewage through the automatic sewage discharge waterway 3.

[0053] (3) Collecting temperature data in the automatic sewage discharge channel 3 during the timed sewage discharge process or the automatic sewage discharge process, and generating and sending an abnormal sewage discharge alarm signal according to the change trend of the temperature data in the automatic sewage discharge channel 3.

[0054] The water vapor sampling device described in this embodiment 1 utilizes the control system 12 to send a timed sewage discharge control signal to trigger the electric sewage valve 7 to open or close on time, thereby achieving the purpose of timed sewage discharge; secondly, the temperature sensor 8 is utilized to collect the temperature data in the automatic sewage discharge channel 3, and according to the change trend of the temperature data in the automatic sewage discharge channel 3, timely warning of the failure of the electric sewage discharge valve 7 is achieved, so that the operator is promptly prompted to perform manual sewage discharge, thereby improving the reliability of the device; in addition, the electric sewage discharge valve 7 is automatically opened or closed according to the preset water sample index data in the sampling main water channel 2 collected by the online chemical instrument 11, so as to realize automatic and timely sewage discharge according to the water quality of the water vapor sample, thereby effectively ensuring the authenticity and accuracy of the water vapor sampling monitoring results.

[0055] Example 2

[0056] As attached Figure 2As shown, the structure and principle of the water vapor sampling device provided in this embodiment 2 are basically the same as those of the water vapor sampling device provided in the above-mentioned embodiment 1; the difference is that it also includes a sewage bypass 4 and a manual sewage valve 10 arranged on the sewage bypass 4.

[0057] Specifically, the outlet of the sampling pipeline 1 is provided with three routes; wherein the first route is connected to the inlet of the sampling main water channel 2, the second route is connected to the inlet of the automatic sewage channel 3, and the third route is connected to the inlet of the sewage bypass channel 4; the remaining structure and the working and control principles of the water vapor sampling device are basically the same as the sampling device described in the above-mentioned embodiment 1, and will not be repeated here.

[0058] The water vapor sampling device of the present invention is provided with a primary stop valve 5 and a secondary stop valve 6 on a sampling pipeline 1, and the primary stop valve 5 and the secondary stop valve 6 are used to control the on-off of the water sample at the sampling point; the water sample is divided into two or three paths after the secondary stop valve, and three paths are taken as an example: the first path goes to the sampling main water path 2 of the cooling and pressure reduction process, the second path goes to the automatic sewage path 3, and the third path goes to the sewage bypass 4; the sampling main water path 2 is provided with a water sample cooling and pressure reduction device and an online chemical instrument 11, and the water sample is provided to the online chemical instrument 11 for water quality measurement after cooling and pressure reduction; the automatic The sewage discharge path 3 is provided with an electric sewage discharge valve 7, a temperature sensor 8 and a manual stop valve 9. The electric sewage discharge valve 7 executes the control signal of the control system 12 to automatically discharge sewage. The temperature sensor 8 is used to monitor the temperature changes during and after sewage discharge. When the temperature does not rise during sewage discharge, it proves that the electric sewage discharge valve 7 has a stuck fault, or when the temperature does not drop after sewage discharge, it proves that the electric sewage discharge valve 7 has an internal leakage fault; the manual stop valve 9 is used to manually close the automatic sewage discharge path 3 when the electric sewage discharge valve 7 fails; the sewage bypass 4 is used to manually discharge sewage when the automatic sewage discharge path 3 is abnormal.

[0059] In the present invention, the sampling device performs timed sewage discharge or automatic sewage discharge operation. After the sewage discharge is completed, the electric sewage discharge valve 7 is closed, that is, the automatic sewage discharge path 3 is closed, and the water sample passes through the cooling and pressure reduction device and enters the online chemical instrument 11 for water quality monitoring; in the normal sampling process, the reading of the online chemical instrument 11 is used as a signal to determine whether there are impurities in the sampling main water path 2. If impurities exist, an automatic sewage discharge control signal is sent to the electric sewage discharge valve 7 to start the automatic sewage discharge action. After the automatic sewage discharge action is completed, it is again determined according to the reading of the online chemical instrument 11 whether the impurities in the pipeline have been completely removed. If they have been completely removed, normal measurement is performed, otherwise the sewage discharge action continues; when it is determined that the electric sewage discharge valve 7 is abnormal according to the reading of the temperature sensor 8, an alarm is issued to prompt the user to use manual sewage discharge to discharge sewage.

[0060] The water vapor sampling device and sewage discharge method thereof described in the present invention have a simple device structure. It is only necessary to add an automatic sewage discharge line and a sewage discharge bypass on the basis of the existing sampling device, and an electric sewage discharge valve, a temperature sensor and a receiving stop valve are arranged on the automatic sewage discharge line. The electric sewage discharge valve, the temperature sensor and the online chemical instrument on the sampling main water line are connected to the control system, and the control system is used to automatically control the opening and closing of the electric sewage discharge valve to realize the automatic sewage discharge function of the water vapor sampling device. The device is reliable in operation and easy to maintain. The present invention can realize the automation of the sewage discharge process, that is, regular and quantitative sewage discharge, without the need for operating personnel to directly operate the manual sewage discharge valve, thus avoiding exposure of personnel to a high temperature and high pressure environment and reducing safety risks. At the same time, it can help to reduce the waste of high-quality water vapor, automatically discharge sewage according to water quality conditions, thereby reducing sewage discharge energy consumption and water consumption, and helping the unit to save energy, reduce emissions and reduce consumption.

[0061] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A water vapor sampling device, characterized in that: The system comprises a sampling pipeline (1), a sampling main water channel (2), an automatic sewage drainage channel (3), an electric sewage drainage valve (7), a temperature controller (8), an online chemical instrument (11) and a control system (12); the inlet of the sampling pipeline (1) is connected to a preset sampling point of a water vapor system, and the outlet of the sampling pipeline (1) is provided with two channels; wherein the first channel is connected to the inlet of the sampling main water channel (2), and the second channel is connected to the inlet of the automatic sewage drainage channel (3); the electric sewage drainage valve (7) and the temperature controller (8) are connected in series to the automatic sewage drainage channel (3), and the online chemical instrument (11) is provided on the sampling main water channel (2); the output ends of the temperature controller (8) and the online chemical instrument (11) are both connected to the input end of the control system (12), and the output end of the control system (12) is connected to the control end of the electric sewage drainage valve (7); The temperature controller (8) is used to collect temperature data in the automatic sewage drainage channel (3); the online chemical instrument (11) is used to collect preset water sample index data in the sampling main water channel (2); the control system (12) is used to generate and send a timed sewage discharge control signal to the electric sewage discharge valve (7), and is also used to generate and send an abnormal sewage discharge alarm signal based on the temperature data in the automatic sewage drainage channel (3), and is also used to generate and send an automatic sewage discharge control signal to the electric sewage discharge valve (7) based on the preset water sample index data in the sampling main water channel (2); wherein the timed sewage discharge control signal is used to trigger the electric sewage discharge valve (7) to open or close at a fixed time, and the automatic sewage discharge control signal is used to trigger the electric sewage discharge valve (7) to open or close automatically.

2. A water vapor sampling device according to claim 1, characterized in that: It also includes a sewage bypass (4) and a manual sewage valve (10); the outlet of the sampling pipeline (1) is also provided with a third path, and the third path is connected to the inlet of the sewage bypass (4); the manual sewage valve (10) is arranged on the sewage bypass (4), and the manual sewage valve (10) is in a normally closed state.

3. A water vapor sampling device according to claim 1, characterized in that: It also comprises a primary stop valve (5) and a secondary stop valve (6); the primary stop valve (5) and the secondary stop valve (6) are connected in series to the sampling pipeline (1) in sequence.

4. A water vapor sampling device according to claim 1, characterized in that: It also comprises a manual stop valve (9); the manual stop valve (9) is arranged on the automatic sewage drainage channel (3) and is located between the temperature controller (8) and the outlet of the automatic sewage drainage channel (3).

5. A water vapor sampling device according to claim 4, characterized in that: The manual stop valve (9) is in a normally open state.

6. A water vapor sampling device according to claim 1, characterized in that: It also includes a water sample cooling and pressure reduction device; the water sample cooling and pressure reduction device is arranged on the sampling main water channel (2) and is located between the entrance of the sampling main water channel (2) and the online chemical instrument (11); wherein the water sample cooling and pressure reduction device is used to cool and reduce the pressure of the water sample in the sampling main water channel (2).

7. A water vapor sampling device according to claim 1, characterized in that: The online chemical instrument adopts a hydrogen conductivity meter or an online iron meter.

8. The water vapor sampling device according to claim 1, characterized in that: The preset sampling points of the water vapor system are the condensate pump outlet, the deaerator inlet, the deaerator outlet, the economizer inlet, the main steam sampling point, the reheat steam sampling point or the high pressure heater drain sampling point.

9. A water vapor sampling device according to claim 1, characterized in that: The control system (12) is a PLC controller or a DCS control system.

10. A method for discharging waste from a water vapor sampling device according to any one of claims 1 to 9, characterized in that: include: Compare the current time with the preset time to determine whether the preset time has arrived; When the timing time arrives, a timing sewage discharge control signal is generated and sent to the electric sewage discharge valve (7), triggering the electric sewage discharge valve (7) to open, so as to perform the current round of timing sewage discharge through the automatic sewage discharge channel (3); Determining whether the opening time of the electric sewage discharge valve (7) reaches a preset sewage discharge time; If it is reached, a timed sewage discharge control signal is regenerated to trigger the electric sewage discharge valve (7) to close, so as to complete the current round of timed sewage discharge operation; Collecting preset water sample index data in the sampling main water path (2), generating and sending an automatic sewage discharge control signal according to the preset water sample index data in the sampling main water path (2), triggering the electric sewage discharge valve (7) to automatically open, so as to automatically discharge sewage through the automatic sewage discharge path (3); Temperature data in the automatic sewage discharge channel (3) during the timed sewage discharge process or the automatic sewage discharge process is collected, and an abnormal sewage discharge alarm signal is generated and sent according to the change trend of the temperature data in the automatic sewage discharge channel (3).

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