A chemical water and steam sampling device for thermal power plants

Abstract

The present invention provides a chemical water and steam sampling device for a thermal power plant, which belongs to the field of mechanical technology; it includes a high-temperature and high-pressure frame, a cooling precooler is fixedly connected to the top position of the high-temperature and high-pressure frame, and a water inlet pipe is fixedly connected to one side of the high-temperature and high-pressure frame. The present invention provides a secondary cooler. When in use, the main steam and economizer water samples flow from the sample outlet into the water inlet pipe, are processed by the cooling precooler, flow into the first cooler through the first high-temperature and high-pressure valve and the second high-temperature and high-pressure valve, and then flow into the second cooler through the first water outlet pipe, and flow into the monitoring pipeline through the third water outlet pipe. The water sample flow rate is adjusted to maintain at 500-700 ml / min, and the water sample temperature is observed. After the water sample temperature is cooled by the first cooler, the use of the secondary cooler effectively increases the cooling area, further reduces the water sample temperature, and effectively improves the accuracy of the measurement data.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology, relates to fluid science, and particularly relates to a chemical water and steam sampling device for a thermal power plant. Background Art

[0002] The water vapor sampling and online analysis of supercritical units are the focus of chemical supervision work in thermal power plants. The steam centralized sampling device is mainly used for continuous monitoring, and accurately and timely provides water vapor quality and related parameters, and alarms for abnormal operating conditions of the monitored objects, so as to accurately and effectively control the water quality conditions of the thermal system. At the same time, the water vapor sampling device will provide the chemical dosing system with the signals required for continuous automatic dosing control of condensate, feed water ammonia, and oxygen, effectively protecting the safety of equipment, instruments and operators. Since the water in boilers and thermal systems is mostly at a high temperature, it is not convenient to sample or measure at high water temperature. It should be cooled during sampling. The samples at the sampling point need to be introduced into the sampling cooler for cooling. It is generally required to ensure that when the flow rate is 500-700mL / min, the sample can be cooled to below 30-40 degrees to meet the national standard.

[0003] When the existing centralized water vapor sampling device is in use, it often fails to meet the constant temperature device sampling standard after cooling through the original design precooler and primary cooler, which will cause the instrument sampling temperature to be high, affecting the accuracy of the measured value. Therefore, this application provides a thermal power plant chemical water and steam sampling device to meet the needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a chemical water and steam sampling device for a thermal power plant to solve the problem that the existing water vapor centralized sampling device often fails to meet the sampling standard of the constant temperature device after cooling through the originally designed precooler and primary cooler during use, which will cause the instrument sampling temperature to be high and affect the accuracy of the measured value.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A chemical water and steam sampling device for a thermal power plant comprises a high-temperature and high-pressure frame, wherein a cooling precooler is fixedly connected to the top position of the high-temperature and high-pressure frame, a water steam inlet pipe is fixedly connected to one side of the high-temperature and high-pressure frame, one end of the water steam inlet pipe is connected to the main steam and the water sample outlet of the economizer, a first high-temperature and high-pressure valve and a second high-temperature and high-pressure valve are fixedly connected to the water steam inlet pipe, one end of the water steam inlet pipe is fixedly connected to a primary cooler, the primary cooler is connected to a first water steam outlet pipe, the first water steam outlet pipe is connected to a second water steam outlet pipe, the second water steam outlet pipe is fixedly connected to a first Two stop valves, one end of the first water outlet pipe is fixedly connected to the secondary cooler, the secondary cooler is connected to the third water outlet pipe, the third water outlet pipe is fixedly connected to the first stop valve, a monitoring pipe is fixedly connected to the bottom position of the high-temperature and high-pressure frame, the monitoring pipe is provided with a flow regulating valve, one end of the second water outlet pipe and the third water outlet pipe are both connected to the monitoring pipe, and also include a trigger component, the trigger component is used to detect the temperature of the cooling water discharged from the first water outlet pipe, and the trigger component is provided on the first water outlet pipe.

[0007] Preferably, the first water steam outlet pipe, the second water steam outlet pipe and the third water steam outlet pipe are all made of stainless steel.

[0008] Preferably, the flow regulating valve is a needle regulating valve.

[0009] Preferably, a water sample temperature monitoring instrument is provided on the monitoring pipeline.

[0010] Preferably, the trigger assembly includes a heat conducting pipe fixedly connected to the outer wall of the first water steam outlet pipe, the outer wall of the heat conducting pipe is fixedly connected to an air bag, the outer wall of the heat conducting pipe is fixedly connected to a fixing box, the air bag is arranged in the fixing box, a limiting hole is provided on the fixing box, a pair of fixing blocks are fixedly connected to one side of the outer wall of the fixing box where the limiting hole is provided, one side of each of the fixing blocks is fixedly connected to a spring, one end of the two springs is fixedly connected to the same movable plate, the outer wall of the movable plate is fixedly connected to an electrode sheet, the high-temperature and high-pressure frame is fixedly connected to a fixing plate, one side of the fixing plate is fixedly connected to an electrode seat, a controller is provided on the fixing plate, the electrode seat is adapted to the electrode sheet, the second water steam outlet pipe is fixedly connected to a first solenoid valve, the first water steam outlet pipe is fixedly connected to a second solenoid valve, and the first solenoid valve and the second solenoid valve are both electrically connected to the controller.

[0011] Preferably, the heat pipe is made of a metal material with good thermal conductivity.

[0012] Preferably, the airbag is made of elastic material.

[0013] Preferably, the fixing box is made of metal, and the fixing block and the fixing box are fixed by welding.

[0014] Preferably, the movable plate is made of corrosion-resistant metal.

[0015] Preferably, the fixing plate is made of plastic.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] In the above scheme, through the secondary cooler, when in use, first open all the valves of the cooling water system of the device, adjust the cooling water flow to normal, so that the cooling water pressure is 0.2-0.8Mpa, open all the sewage doors and the primary door of the water sample on the sampling rack, flush the sampling tube for - minutes, then close all the sewage doors, open the secondary doors of all water samples on the sampling rack, and the main steam and economizer water samples flow from the sample outlet into the water inlet pipe. After being processed by the cooling precooler, they flow into the first high-temperature and high-pressure valve and the second high-temperature and high-pressure valve into the first cooler, and then flow into the second cooler through the first water outlet pipe, and flow into the monitoring pipe through the third water outlet pipe. The water sample flow rate is adjusted to maintain at 500-700ml / min, and the water sample temperature is observed. After the water sample temperature is cooled by the first cooler, the use of the secondary cooler effectively increases the cooling area, further reduces the water sample temperature, and effectively improves the accuracy of the measurement data.

[0018] Through the set air bag, when the sampled water flows through the first water outlet steam pipe, the temperature of the sampled water is transferred to the air bag through the heat conduction pipe, and the air bag expands due to the heat. When the water temperature of the sampler is normal, the amount of expansion of the air bag is insufficient. At this time, the second solenoid valve is closed, and the sampled water flows through the first solenoid valve and the second water outlet steam pipe into the monitoring pipe to monitor the sampled water. When the sampled water temperature is too high, the air bag expands due to the heat, causing the air bag to be squeezed out through the limiting hole and to conflict with the movable plate. The movable plate moves under the action of the air bag, driving the electrode sheet to contact the electrode seat. At this time, the controller set in the fixed plate controls the second solenoid valve to open, and the first solenoid valve is closed at the same time. The sampled water flows into the secondary cooler through the second solenoid valve, realizing secondary cooling of the sampled water. It can effectively save resources during use and avoid the problem of energy waste to a certain extent caused by the sampled water temperature reaching the required value and still passing through the secondary cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable one skilled in the relevant art to make and use the present disclosure.

[0020] Figure 1This is a first-person perspective diagram of the three-dimensional structure of the chemical water and steam sampling device in a thermal power plant;

[0021] Figure 2 This is a schematic diagram of the second-angle perspective of the three-dimensional structure of the chemical water and steam sampling device in a thermal power plant;

[0022] Figure 3 This is a partially cutaway schematic diagram of the three-dimensional structure of a chemical water and steam sampling device in a thermal power plant from a third perspective;

[0023] Figure 4 A schematic diagram of the three-dimensional enlarged structure of the trigger assembly and the first water vapor outlet pipe;

[0024] Figure 5 for Figure 3 Enlarged structural diagram at point A in the middle.

[0025] [reference numerals]

[0026] 1. High-temperature and high-pressure rack; 2. Cooling precooler; 3. Water inlet pipe; 4. First high-temperature and high-pressure valve; 5. Second high-temperature and high-pressure valve; 6. First-stage cooler; 7. First water outlet pipe; 8. Second water outlet pipe; 9. Second-stage cooler; 10. Third water outlet pipe; 11. Monitoring pipeline; 12. Flow regulating valve; 13. First stop valve; 14. Second stop valve; 15. Trigger assembly; 16. Heat pipe; 17. Airbag; 18. Fixing box; 19. Limiting hole; 20. Fixing block; 21. Spring; 22. Movable plate; 23. Electrode sheet; 24. Fixing plate; 25. Electrode holder; 26. First solenoid valve; 27. Second solenoid valve.

[0027] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the appended claims. DETAILED DESCRIPTION

[0028] The following describes in detail a chemical water and steam sampling device for a thermal power plant provided by the present invention, with reference to the accompanying drawings and specific embodiments. It is also noted that, for the sake of completeness, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for known techniques. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0029] It should be noted that references in the specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment will include such specific features, structures, or characteristics. In addition, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments.

[0030] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0031] It will be understood that the meanings of “on,” “over,” and “above” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes being “on” something with intervening features or layers, and “on” or “over” means not only “on” or “above” something, but also includes being “on” or “above” something with no intervening features or layers.

[0032] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0033] like Figure 1-5As shown, an embodiment of the present invention provides a chemical water and steam sampling device for a thermal power plant, comprising a high-temperature and high-pressure frame 1, a cooling precooler 2 being fixedly connected to the top position of the high-temperature and high-pressure frame 1, and the cooling precooler 2 can pre-cool the main steam and economizer water samples, a water inlet steam pipe 3 is fixedly connected to one side of the high-temperature and high-pressure frame 1, one end of the water inlet steam pipe 3 is connected to the main steam and economizer water sample outlet, and the sampling monitoring water flows out from the main steam and economizer water sample outlet into the water inlet steam pipe 3, a first high-temperature and high-pressure valve 4 and a second high-temperature and high-pressure valve 5 are fixedly connected to the water inlet steam pipe 3, one end of the water inlet steam pipe 3 is fixedly connected to a primary cooler 6, and the primary cooler 6 is connected to a first water outlet steam pipe 7, and the first water outlet The steam pipe 7 is connected to the second water outlet steam pipe 8, and the second water outlet steam pipe 8 is fixedly connected to the second stop valve 14. One end of the first water outlet steam pipe 7 is fixedly connected to the secondary cooler 9, and the secondary cooler 9 is connected to the third water outlet steam pipe 10, and the third water outlet steam pipe 10 is fixedly connected to the first stop valve 13. A monitoring pipe 11 is fixedly connected to the bottom position of the high-temperature and high-pressure frame 1, and a flow regulating valve 12 is provided on the monitoring pipe 11. One end of the second water outlet steam pipe 8 and the third water outlet steam pipe 10 are both connected to the monitoring pipe 11, and also include a trigger component 15, which is used to detect the temperature of the cooling water discharged from the first water outlet steam pipe 7. The trigger component 15 is set on the first water outlet steam pipe 7.

[0034] Through the set secondary cooler 9, when in use, first open all the valves of the cooling water system of the device, adjust the cooling water flow to normal, so that the cooling water pressure is 0.2-0.8Mpa, open all the sewage doors and the primary door of the water sample on the sampling rack, flush the sampling tube for 5-10 minutes, then close all the sewage doors, open all the secondary doors of the water sample on the sampling rack, and the main steam and economizer water samples flow from the sample outlet into the water inlet pipe 3, after being processed by the cooling precooler 2, through the first high-temperature and high-pressure valve 4 and the second high-temperature and high-pressure valve 5 into the first cooler 6, and then through the first water outlet pipe 7 into the second cooler 9, and through the third water outlet pipe 10 into the monitoring pipe 11, adjust the water sample flow rate to maintain at 500-700ml / min, observe the water sample temperature, after the water sample temperature is cooled by the primary cooler 6, the use of the secondary cooler 9 effectively increases the cooling area, further reduces the water sample temperature, and effectively improves the accuracy of the measurement data.

[0035] In this embodiment, if Figure 1-3 As shown, the first water steam outlet pipe 7, the second water steam outlet pipe 8 and the third water steam outlet pipe 10 are all made of stainless steel, which effectively prevents the sample from being contaminated by metal corrosion products in the first water steam outlet pipe 7, the second water steam outlet pipe 8 and the third water steam outlet pipe 10 during the sampling process.

[0036] In this embodiment, if Figure 2As shown, the flow regulating valve 12 is a needle-shaped regulating valve, which is convenient for adjusting the flow of sampled water in the monitoring pipe 11.

[0037] In this embodiment, if Figure 2 As shown, a water sample temperature monitoring instrument is provided on the monitoring pipe 11 to facilitate temperature monitoring of the sampled water in the monitoring pipe 11 .

[0038] As an implementation method in this example, Figure 1-5 As shown, the trigger assembly 15 includes a heat conducting pipe 16 fixedly connected to the outer wall of the first water vapor outlet pipe 7, the outer wall of the heat conducting pipe 16 is fixedly connected to an air bag 17, the outer wall of the heat conducting pipe 16 is fixedly connected to a fixing box 18, the air bag 17 is arranged in the fixing box 18, a limiting hole 19 is provided on the fixing box 18, and a pair of fixing blocks 20 are fixedly connected to one side of the limiting hole 19 on the outer wall of the fixing box 18, each fixing block 20 is fixedly connected to a spring 21 on one side, and one end of the two springs 21 is fixedly connected to the same movable plate 2 2. The outer wall of the movable plate 22 is fixedly connected to the electrode sheet 23, and the high-temperature and high-pressure frame 1 is fixedly connected to a fixed plate 24. One side of the fixed plate 24 is fixedly connected to an electrode holder 25. A controller is provided on the fixed plate 24. The controller is a prior art controller, specifically a PLC controller. The electrode holder 25 is adapted to the electrode sheet 23. A first solenoid valve 26 is fixedly connected to the second water vapor outlet pipe 8, and a second solenoid valve 27 is fixedly connected to the first water vapor outlet pipe 7. Both the first solenoid valve 26 and the second solenoid valve 27 are electrically connected to the controller.

[0039] When the sample water flows through the first water outlet pipe 7, the temperature of the sample water is transferred to the air bag 17 through the heat conduction pipe 16. The air bag 17 expands due to the heat. When the water temperature of the sampler is normal, the amount of expansion of the air bag 17 is insufficient. At this time, the second solenoid valve 27 is closed, and the sample water flows through the first solenoid valve 26 and the second water outlet pipe 8 into the monitoring pipe 11 for monitoring the sample water. When the sample water temperature is too high, the air bag 17 expands due to the heat, causing the air bag 17 to be squeezed out through the limit hole 19 and to conflict with the movable plate 22. The movable plate 22 moves under the action of the air bag 17, driving the electrode sheet 23 to contact the electrode seat 25. At this time, the controller set in the fixed plate 24 controls the second solenoid valve 27 to open, and the first solenoid valve 26 to close. The sample water flows into the secondary cooler 9 through the second solenoid valve 27 to achieve secondary cooling of the sample water. During use, it can effectively save resources and avoid the problem of a certain degree of energy waste caused by the sample water still passing through the secondary cooler 9 after the sample water temperature reaches the required value.

[0040] In this embodiment, if Figure 4As shown, the material of the heat pipe 16 is a metal material with good thermal conductivity, and the material of the airbag 17 is an elastic material. The use of metal material with good thermal conductivity enables the heat pipe 16 to better transfer the sampling water temperature inside the first water outlet pipe 7 to the airbag 17. The use of elastic material for the airbag 17 is more conducive to the airbag 17 being squeezed out from the limiting hole 19 when it expands due to heat.

[0041] In this embodiment, if Figure 4-5 As shown, the material of the fixing box 18 is metal, preferably stainless steel. The fixing block 20 and the fixing box 18 are fixed by welding. The welding method has a better and stronger fixing effect. The fixing box 18 is made of stainless steel, which makes the fixing box 18 more corrosion-resistant. The fixing box 18 is exposed to the air for a long time and can effectively avoid the problem of rust of the fixing box 18 caused by corrosion by moisture and dust in the air.

[0042] In this embodiment, if Figure 4 As shown, the movable plate 22 is made of a corrosion-resistant metal material, preferably stainless steel, which can effectively prevent the movable plate 22 from being corroded by moisture and dust in the air during use and causing rust.

[0043] In this embodiment, if Figure 5 As shown, the fixing plate 24 is made of plastic material, which is cheaper and helps to reduce production costs.

[0044] The technical solution provided by the present invention is to set up a secondary cooler. When in use, first open all the valves of the cooling water system of the device, adjust the cooling water flow to normal, so that the cooling water pressure is 0.2-0.8Mpa, open all the sewage doors and the primary doors of the water samples on the sampling rack, flush the sampling tube for - minutes, then close all the sewage doors, open all the secondary doors of the water samples on the sampling rack, and the main steam and economizer water samples flow from the sample outlet into the water inlet pipe, after being processed by the cooling precooler, flow into the first high-temperature and high-pressure valve and the second high-temperature and high-pressure valve into the first cooler, and then flow into the second cooler through the first water outlet pipe, and flow into the monitoring pipe through the third water outlet pipe. The water sample flow is adjusted to maintain at 500-700ml / min, and the water sample temperature is observed. After the water sample temperature is cooled by the first cooler, the use of the secondary cooler effectively increases the cooling area, further reduces the water sample temperature, and effectively improves the accuracy of the measurement data.

[0045] Through the set air bag, when the sampled water flows through the first water outlet steam pipe, the temperature of the sampled water is transferred to the air bag through the heat conduction pipe, and the air bag expands due to the heat. When the water temperature of the sampler is normal, the amount of expansion of the air bag is insufficient. At this time, the second solenoid valve is closed, and the sampled water flows through the first solenoid valve and the second water outlet steam pipe into the monitoring pipe to monitor the sampled water. When the sampled water temperature is too high, the air bag expands due to the heat, causing the air bag to be squeezed out through the limiting hole and to conflict with the movable plate. The movable plate moves under the action of the air bag, driving the electrode sheet to contact the electrode seat. At this time, the controller set in the fixed plate controls the second solenoid valve to open, and the first solenoid valve is closed at the same time. The sampled water flows into the secondary cooler through the second solenoid valve, realizing secondary cooling of the sampled water. It can effectively save resources during use and avoid the problem of energy waste to a certain extent caused by the sampled water temperature reaching the required value and still passing through the secondary cooler.

[0046] The present invention encompasses any alternatives, modifications, equivalents, and solutions that fall within the spirit and scope of the present invention. To provide a thorough understanding of the present invention, specific details are described in detail below in connection with the preferred embodiments of the present invention, but those skilled in the art will be able to fully understand the present invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of the present invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0047] Those skilled in the art will understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A chemical water and steam sampling device for a thermal power plant, characterized in that: include: A high-temperature and high-pressure rack, wherein a cooling precooler is fixedly connected to the top of the high-temperature and high-pressure rack, and a water steam inlet pipe is fixedly connected to one side of the high-temperature and high-pressure rack, and one end of the water steam inlet pipe is connected to the main steam and economizer water sample outlets; The water steam inlet pipe is fixedly connected to a first high-temperature and high-pressure valve and a second high-temperature and high-pressure valve, one end of the water steam inlet pipe is fixedly connected to a primary cooler, the primary cooler is connected to a first water steam outlet pipe, the first water steam outlet pipe is connected to a second water steam outlet pipe, the second water steam outlet pipe is fixedly connected to a second stop valve, one end of the first water steam outlet pipe is fixedly connected to a secondary cooler, the secondary cooler is connected to a third water steam outlet pipe, and the third water steam outlet pipe is fixedly connected to a first stop valve; A monitoring pipe is fixedly connected to the bottom of the high-temperature and high-pressure frame, a flow regulating valve is provided on the monitoring pipe, and one end of the second steam outlet pipe and the third steam outlet pipe are both connected to the monitoring pipe; It also includes a trigger component, the trigger component is used to detect the temperature of the cooling water discharged from the first water outlet pipe, and the trigger component is arranged on the first water outlet pipe; The trigger assembly includes a heat conducting pipe fixedly connected to the outer wall of the first water outlet pipe, the outer wall of the heat conducting pipe is fixedly connected to an air bag, the outer wall of the heat conducting pipe is fixedly connected to a fixing box, the air bag is arranged in the fixing box, a limiting hole is provided on the fixing box, a pair of fixing blocks are fixedly connected to one side of the outer wall of the fixing box where the limiting hole is provided, one side of each of the fixing blocks is fixedly connected to a spring, one end of the two springs is fixedly connected to the same movable plate, the outer wall of the movable plate is fixedly connected to an electrode sheet, the high temperature and high pressure frame is fixedly connected to a fixing plate, one side of the fixing plate is fixedly connected to an electrode seat, a controller is provided on the fixing plate, the electrode seat is adapted to the electrode sheet, the second water outlet pipe is fixedly connected to a first solenoid valve, the first water outlet pipe is fixedly connected to a second solenoid valve, and the first solenoid valve and the second solenoid valve are both electrically connected to the controller.

2. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The first water steam outlet pipe, the second water steam outlet pipe and the third water steam outlet pipe are all made of stainless steel.

3. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The flow regulating valve is a needle regulating valve.

4. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The monitoring pipeline is provided with a water sample temperature monitoring instrument.

5. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The heat pipe is made of a metal material with good thermal conductivity.

6. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The material of the airbag is elastic material.

7. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The fixing box is made of metal, and the fixing block is fixed to the fixing box by welding.

8. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The movable plate is made of corrosion-resistant metal.

9. The chemical water and steam sampling device for thermal power plants according to claim 1, characterized in that: The fixing plate is made of plastic.

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