Wet steam standard device and method for tracing to-be-tested device

Abstract

The invention relates to the field of steam verification, and discloses a wet steam standard device and a method for tracing a to-be-tested device thereof.The wet steam standard device comprises a verification pipeline, a pressure stabilizing mechanism, a pressure reducing valve, a condenser, a weighing mechanism and an adjusting mechanism, and the to-be-tested device is connected to the verification pipeline and located at the end close to a steam outlet; the to-be-detected device is used for monitoring the steam quality in flowing steam in the verification pipeline on line in real time, and the steam quality at least comprises steam quality and steam dryness; the device to be measured is integrally installed in the designed wet steam standard device for unified verification and calibration, inspection and traceability are not needed, the traceability process is simplified, the measurement accuracy and operation convenience are improved, accumulated errors caused by separate and independent calibration of various measuring instruments in the device to be measured are avoided, and the measurement accuracy is improved. And the measurement accuracy and consistency of the to-be-measured device are further improved.

Description

Technical Field

[0001] The invention relates to the field of steam verification, and in particular to a wet steam standard device and a method for tracing the source of a device to be tested. Background Art

[0002] Steam, as an efficient energy transmission medium, is an important power medium in the tobacco manufacturing process. In the traditional thin-plate drying process, steam provides the energy required for drying, and the wall temperature of the drying cylinder is converted according to the steam pressure entering the cylinder under the saturated steam state. When the steam quality (steam quality, steam flow, steam temperature, steam pressure, and steam dryness, etc.) changes, the actual cylinder wall temperature will not meet the design requirements of the drying process when the steam pressure entering the cylinder remains unchanged. In addition, steam is directly involved in the production and processing of materials in the processes of tobacco leaf rehumidification, feeding, and leaf expansion. In addition to heating the material, steam also directly humidifies the material. Therefore, changes in steam dryness will directly affect the process quality indicators of the material and the compliance of the process parameters of the production process, thereby causing fluctuations in product quality.

[0003] Therefore, accurate evaluation of steam quality, especially steam dryness, and improving the stability of steam quality in terms of steam dryness are conducive to ensuring the stability of tobacco product quality and improving the manufacturing level of tobacco products. Generally, various instruments are used to measure steam quality, and the instruments need to be traced before use. Instrument traceability refers to tracing the measurement results of the instrument back to national or international standards through a series of calibrations and comparisons to ensure its accuracy and reliability.

[0004] There are four commonly used measurement traceability methods: ① physical standard level-by-level traceability (submission for inspection); ② Measurement Assurance Programs (MAP); ③ issuing standard materials for traceability; ④ broadcasting standard signals for traceability. In steam quality verification instruments, physical standard level-by-level traceability is the most commonly used traceability method.

[0005] The physical standard level-by-level traceability is a metrological guarantee mode based on the upward traceability of the standard laboratory. This guarantee method sends the metrological instruments to the metrological department with a higher level of metrological standards for verification. For metrological instruments that are inconvenient to transport, the metrological technical organization at the next level will send personnel to carry the metrological standards to the site for verification. Measuring equipment that is easy to transport is sent to the upper level metrological department for traceability. This guarantee method has outstanding advantages in the fields of high-precision, single-parameter instrument metrological calibration, and advanced laboratory value comparison. The main disadvantages of this method are: ① "Open loop" value transfer method, no feedback effect; ② Long-term transportation makes it impossible to get timely feedback on the test data; ③ After the equipment under test is qualified, the value change caused by transportation is difficult to detect, and the impact of transportation on the value transfer cannot be eliminated; ④ It is only a verification of specific instruments, and the impact of environmental and human factors on the value is not considered; ⑤ The cycle of metrological verification is unscientific; ⑥ For large-scale comprehensive metrological test equipment, it is often difficult to solve problems such as transportation difficulties and inability to dismantle for inspection.

[0006] In addition, in the prior art, the steam quality index test of the instrument device to be tested usually adopts an offline laboratory test method, and various instruments are calibrated independently, which has low test efficiency and poor reliability of test results. Summary of the invention

[0007] The purpose of the present invention is to overcome the problems in the prior art that the traceability process of the device to be tested is cumbersome, the efficiency of steam quality index testing of the device to be tested is low, and the reliability of the test results is poor, and a wet steam standard device and a method for tracing the device to be tested are provided.

[0008] In order to achieve the above-mentioned object, the present invention provides a wet steam standard device in a first aspect, which is used to perform real-time measurement deviation verification on a device to be tested, and the wet steam standard device comprises:

[0009] A test pipeline, one end of which is a steam inlet and the other end is a steam outlet. A device to be tested is connected to the test pipeline and is located near the end of the steam outlet. The device to be tested is used to monitor the steam quality of the flowing steam in the test pipeline online in real time. The steam quality includes at least steam quality and steam dryness.

[0010] A pressure stabilizing mechanism, the pressure stabilizing mechanism is connected to one end of the steam inlet of the test pipeline, and the pressure stabilizing mechanism is used to stabilize the steam pressure entering the test pipeline;

[0011] a pressure reducing valve, the pressure reducing valve being connected to the steam outlet of the inspection pipeline;

[0012] A condenser, the condenser being connected to an end of the pressure reducing valve away from the inspection pipeline, the condenser being used for condensing wet steam flowing out of the inspection pipeline;

[0013] a weighing mechanism, the weighing mechanism receiving condensed water generated in the condenser and weighing the condensed water; and

[0014] The regulating mechanism is connected to the testing pipeline and is located at one end close to the steam inlet, and is used to adjust the dryness of the steam flowing in the testing pipeline.

[0015] Furthermore, the regulating mechanism regulates the dryness of the wet steam to a range of 0.75 to 1.0.

[0016] Further, the steam pressure in the test pipeline ranges from 0.2Mpa to 0.5Mpa;

[0017] Preferably, the calibration pipeline adopts DN40, DN50 or DN80.

[0018] Furthermore, a thermal insulation layer is provided on the periphery of the inspection pipeline.

[0019] Further, the pressure stabilizing mechanism includes a first self-operated pressure regulating valve, a pressure stabilizing tank and a second self-operated pressure regulating valve, the pressure stabilizing tank is connected between the first self-operated pressure regulating valve and the second self-operated pressure regulating valve, and the second self-operated pressure regulating valve is connected to one end of the steam inlet of the inspection pipeline at one end away from the pressure stabilizing tank;

[0020] Preferably, a temperature transmitter and a pressure transmitter are connected to the voltage stabilizing mechanism.

[0021] Furthermore, a porous plate is fixedly provided inside the pressure stabilizing tank, and a stainless steel mesh is fixedly provided on the porous plate;

[0022] Preferably, the distance between the porous plate and the lower bottom of the pressure stabilizing tank is a, and the distance between the porous plate and the upper top of the pressure stabilizing tank is b, wherein: a:b=1:2;

[0023] Preferably, the internal design pressure of the pressure-surge tank is 1.4 MPa to 1.8 MPa.

[0024] Further, the weighing mechanism comprises a commutator, a container and a measuring scale carrying the container, the commutator has an inlet and two outlets, the inlet of the commutator is connected to the condenser, and one of the outlets of the commutator is connected to the container;

[0025] Preferably, a temperature transmitter and a pressure transmitter are connected on the calibration pipeline and located between the device to be tested and the steam outlet of the calibration pipeline.

[0026] Furthermore, the wet steam standard device also includes a superheated steam standard flowmeter, one end of which is connected to the steam inlet of the calibration pipeline, and the other end is connected to the pressure stabilizing mechanism, and the superheated steam standard flowmeter is used to monitor the superheated steam flow rate entering the calibration pipeline;

[0027] Preferably, a temperature transmitter and a pressure transmitter are connected between the superheated steam standard flow meter and the steam inlet of the calibration pipeline.

[0028] Furthermore, the wet steam standard device also includes a controller, and the controller is electrically connected to the pressure stabilizing mechanism, the weighing mechanism and the regulating mechanism.

[0029] In a second aspect, the present invention provides a method for tracing the source of a device to be tested, using the wet steam standard device as described above to trace the source of the device to be tested, and comprising the following steps:

[0030] Preparatory step S1: pre-installing a pressure stabilizing mechanism, a pressure reducing valve, a condenser and a weighing mechanism, connecting the pressure reducing valve, the condenser and the weighing mechanism in sequence, and reserving an installation spacing between the pressure stabilizing mechanism and the pressure reducing valve;

[0031] Installation step S2: obtaining a test pipeline, installing the device to be tested and the regulating mechanism on the test pipeline, connecting the steam inlet end of the test pipeline to the pressure stabilizing mechanism, and connecting the steam outlet of the test pipeline to the pressure reducing valve;

[0032] Test step S3: calibrate the voltage stabilizing mechanism and the regulating mechanism, record the calibration data of the voltage stabilizing mechanism and the regulating mechanism, and after the calibration is completed, introduce superheated steam into the wet steam standard device, and the superheated steam passes through the voltage stabilizing mechanism, the calibration pipeline and the pressure reducing valve in sequence, and then condenses through the condenser to produce condensed water, and finally the mass of the condensed water is weighed by the weighing mechanism;

[0033] Data collection step S4: real-time collection and recording of steam quality characteristic parameter data monitored by the device to be tested, the steam quality characteristic parameters at least including steam quality and steam dryness; real-time collection and recording of weighing data of the weighing mechanism; real-time collection and recording of environmental data;

[0034] Data processing step S5: taking the weighing data of the weighing mechanism and the monitoring data of the device to be tested at any and the same time, and performing environmental compensation on the weighing data and the monitoring data according to the environmental data at the same time;

[0035] The weighing data of the weighing mechanism after compensation is compared with the steam quality data monitored by the device to be tested after compensation to obtain the calculated dryness value of the steam, the steam dryness data monitored by the device to be tested after compensation is the measured dryness value of the steam, and the error value is calculated by comparing the calculated dryness value of the steam with the measured dryness value;

[0036] Abnormal detection judgment step S6: judging whether the error value exceeds a preset threshold;

[0037] If yes, it is determined to be an abnormal event, detection is stopped, an alarm is issued, and a log recording step S8 is performed;

[0038] If not, proceed to the accuracy determination step S7;

[0039] Accuracy determination step S7: evaluating the error value and determining whether to re-measure;

[0040] If yes, repeat steps S3 to S6;

[0041] If not, then log recording step S8 is performed;

[0042] Logging step S8: Log the detection process, the recorded content includes calibration data, environmental data, weighing data before and after compensation, monitoring data before and after compensation, calculated dryness value data, measured dryness value data and abnormal events.

[0043] A wet steam standard device using the above technical solution of the present invention has the following effects:

[0044] By installing the device under test as a whole into the designed wet steam standard device for unified verification and calibration, there is no need to send it for inspection and traceability, which simplifies the traceability process, improves measurement accuracy and ease of operation, and avoids the cumulative errors caused by the separate and independent calibration of various measuring instruments in the device under test, further improving the measurement accuracy and consistency of the device under test. In addition, the pressure stabilizing mechanism, pressure reducing valve, condenser, weighing mechanism and other structures are used to ensure the stability of steam and the high efficiency of condensation, and to ensure the stability and reliability of the long-term operation of the wet steam standard device.

[0045] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a schematic structural diagram of a wet steam standard device according to one embodiment of the present invention;

[0047] Figure 2 It is a schematic cross-sectional view of a pressure-surge tank in a wet steam standard device according to one embodiment of the present invention;

[0048] Figure 3 It is a flowchart of a method for tracing the source of a device to be tested using a wet steam standard device according to an embodiment of the present invention.

[0049] Description of Reference Numerals

[0050] 1. The first self-operated pressure regulating valve; 2. The second self-operated pressure regulating valve; 3. The pressure regulating tank; 4. The calibration pipeline; 5. The regulating mechanism; 6. The device to be tested; 7. The pressure reducing valve; 8. The condenser; 9. The commutator; 10. The weighing mechanism; 11. The water storage mechanism; 12. The superheated steam standard flow meter; 13. The pressure regulating mechanism; 14. The container; 15. The measuring scale; 16. The porous plate; 17. The stainless steel mesh; a. The distance between the porous plate and the lower bottom of the pressure regulating tank; b. The distance between the porous plate and the upper top of the pressure regulating tank. DETAILED DESCRIPTION

[0051] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0052] In the present invention, unless otherwise stated, the directional words such as "upper" and "lower" usually refer to the orientation in the assembled state. "Inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] The present invention provides a wet steam standard device for real-time measurement deviation verification of the device to be tested 6. Figure 1 As shown, the wet steam standard device includes a test pipeline 4, a pressure stabilizing mechanism 13, a pressure reducing valve 7, a condenser 8, a weighing mechanism 10 and an adjusting mechanism 5. Among them, one end of the test pipeline 4 is a steam inlet, and the other end is a steam outlet. The device to be tested 6 is connected to the test pipeline 4 and is located at one end close to the steam outlet. The device to be tested 6 is used to monitor the steam quality of the steam flowing in the test pipeline 4 online in real time.

[0055] The pressure stabilizing mechanism 13 is connected to the steam inlet of the verification pipeline 4 , and the pressure stabilizing mechanism 13 is used to stabilize the steam pressure entering the verification pipeline 4 .

[0056] The regulating mechanism 5 is connected to the testing pipeline 4 and is located at one end close to the steam inlet. The regulating mechanism 5 is used to adjust the dryness of the steam flowing in the testing pipeline 4 .

[0057] The pressure reducing valve 7 is connected to the steam outlet of the calibration pipeline 4. The function of the pressure reducing valve 7 is to maintain the outlet pressure of the pressure reducing valve 7 stable. Specifically, the pressure reducing valve 7 adopts a pilot pressure reducing valve. The pilot pressure reducing valve uses the main valve opening in the control valve body to adjust the flow of the medium, reduce the pressure of the medium, and at the same time, use the feedback of the downstream pressure to adjust the main valve opening, so that the downstream pressure of the pilot pressure reducing valve is kept within a certain range. In the case of changing inlet pressure, the outlet pressure is kept within the set range to ensure that the rear end obtains a stable pressure. This type of pilot pressure reducing valve is usually used, which is installed at the front end of the pipeline and is used to overcome low-frequency pressure pulsation. More specifically, the present application adopts a self-acting pilot valve type pressure reducing valve of the Spirax Sarco brand and model 25P. The main valve is a single valve seat and a carbide valve core. The valve body is made of ductile iron, and the pilot valve is installed on the main valve by bolts.

[0058] The condenser 8 is connected to one end of the pressure reducing valve 7 away from the testing pipeline 4 , and the condenser 8 is used for condensing the wet steam flowing out of the testing pipeline 4 .

[0059] The weighing mechanism 10 is used to receive the condensed water generated in the condenser 8 and weigh the condensed water.

[0060] When using the wet steam standard device, the superheated steam is first introduced into the pressure stabilizing mechanism 13 for pressure adjustment, so that the pressure of the superheated steam is suitable for the use range of the calibration pipeline 4 to ensure safety in use. Generally, the superheated steam pressure is 0.9MPa and the temperature is 200℃, and it is introduced into the pressure stabilizing mechanism 13 through a DN250 gas source pipeline (DN250 refers to a pipeline with a nominal diameter of 250mm).

[0061] The steam after pressure regulation by the pressure stabilizing mechanism 13 enters the test pipeline 4, and while the steam flows in the test pipeline 4, the regulating mechanism 5 at the steam inlet of the test pipeline 4 regulates the steam dryness so that the steam dryness flowing in the test pipeline 4 is within a suitable range.

[0062] The steam after adjusting the dryness is monitored online in real time through the device to be tested 6 on the test pipeline 4. The monitored steam flows out from the steam outlet of the test pipeline 4, and then enters the condenser 8 for condensation after being decompressed by the pressure reducing valve 7. The condenser 8 condenses the steam to obtain condensed water, which flows into the weighing mechanism 10 for weighing and metering.

[0063] It should be noted that steam dryness refers to the ratio of steam mass to total mass. The greater the steam dryness, the greater the steam mass. It should be noted that superheated steam is obtained by further heating saturated steam, and the dryness of superheated steam is 1. The significance of adjusting steam to the appropriate dryness range is reflected in at least the following three aspects.

[0064] On the first aspect, a suitable steam dryness range can reduce or even eliminate extreme errors in the steam dryness measurement of the device to be tested 6, making the dryness measurement accuracy of the device to be tested 6 more accurate and reliable. First of all, the measurement error includes absolute error and relative error. The absolute error is the absolute value of the difference between the measured value and the true value, and the relative error is the ratio of the absolute error to the true value. Calibration of the instrument can reduce or even eliminate the absolute error of the instrument. In comparison, relative error is more widely used and can better reflect the credibility of the measurement. It is also often used in places where high measurement accuracy is required. The smaller the relative error, the higher the measurement accuracy. The steam dryness measurement error in the present invention refers to the relative error.

[0065] Further examples:

[0066] Case 1

[0067] The regulating mechanism 5 adjusts the real dryness of the wet steam to 0.75, and the measured dryness measured by the device to be tested 6 is 0.70. The absolute error is 0.05, and the relative error is 6.7%.

[0068] Case 2

[0069] The regulating mechanism 5 adjusts the real dryness of the wet steam to 0.5, and the measured dryness measured by the device to be tested 6 is 0.55. The absolute error is 0.05, and the relative error is 10.0%.

[0070] Case 3

[0071] The regulating mechanism 5 adjusts the actual dryness of the wet steam to 0.2, and the measured dryness measured by the device to be tested 6 is 0.15. The absolute error is 0.05, and the relative error is 25.0%.

[0072] In actual application of the instrument, it is difficult to completely eliminate the absolute error. Combining the above three situations, when the absolute errors are equal, the adjustment mechanism 5 adjusts the wet steam to different drynesses, and the relative errors are different. Therefore, the adjustment mechanism 5 adjusts the wet steam to a suitable dryness range, so that the dryness accuracy measured by the device to be tested 6 is more accurate and reliable.

[0073] Secondly, the steam in the appropriate dryness range is convenient for the subsequent condensation of the condenser 8. The steam in the appropriate dryness range has enough wet steam for the condenser 8 to condense and obtain enough condensed water so that the weighing mechanism 10 can weigh.

[0074] Thirdly, the various instruments in the device to be tested 6 directly measuring the superheated steam are prone to damage to the instruments, affecting the measurement results of the device to be tested 6. Adjusting the dryness of the superheated steam can reduce the loss of steam to the instruments and ensure the reliability of the measurement results to a certain extent.

[0075] In the present invention, various detection instruments are integrated into the device to be tested 6, so that the device to be tested 6 can monitor the steam quality indicators such as steam quality, steam flow, steam pressure and steam dryness of the steam flowing in the calibration pipeline 4 online in real time, enhance the uniformity of the calibration and calibration of the device to be tested 6, eliminate the cumulative errors caused by independent calibration and verification of the instruments, not only improve the test efficiency, but also ensure the test accuracy and consistency.

[0076] In a further preferred embodiment, the adjustment mechanism 5 adjusts the dryness of the wet steam to a range of 0.75 to 1.0. It should be noted that the dryness of saturated steam and the dryness of superheated steam are both 1, and the adjustment mechanism 5 adjusts the superheated steam to saturated steam without changing the dryness value. However, for the device to be tested 6, it is more reliable to perform other steam quality measurements on saturated steam than on superheated steam. Generally, the adjustment mechanism 5 uses a humidifier and adjusts the dryness of the superheated steam in the calibration pipeline 4 by a spray humidification method.

[0077] In a further preferred embodiment, the steam pressure range in the calibration pipeline 4 is 0.2MPa to 0.5MPa. That is, the pressure stabilizing mechanism 13 adjusts the superheated steam pressure to 0.2MPa to 0.5MPa to ensure the safety and reliability of the calibration pipeline 4 during use. Preferably, the calibration pipeline 4 can use three types of pipes, DN40, DN50 or DN80. The inner diameter and outer diameter of pipes of different nominal diameters vary depending on the material, pressure level and manufacturing standard. In this embodiment, the pipe of the calibration pipeline 4 is made of 304 stainless steel (also known as 18 / 8 stainless steel, which means containing at least 18% chromium and 8% nickel) seamless pipe, the inner wall of the pipe is smooth, and has good roundness and concentricity. The roundness of the inner diameter of the straight pipe section of the calibration pipeline 4 meets the requirement that the difference between any diameter on any plane of the pipe section and the average diameter does not exceed ±0.3%, and the straightness of the straight pipe section meets the requirement of 1mm / m.

[0078] More specifically, the device to be tested 6 is arranged in the calibration pipeline 4 and the device to be tested 6 has a front 20D straight pipe section and a rear 5D straight pipe section. The front 20D straight pipe section refers to the length of the straight pipe section upstream of the device to be tested 6 that is at least 20 times the inner diameter of the calibration pipeline 4; the rear 5D straight pipe section refers to the length of the straight pipe section downstream of the device to be tested 6 that is at least 5 times the inner diameter of the calibration pipeline 4. A high temperature resistant meter clamp is used on the pipeline of the calibration pipeline 4 to facilitate the clamping of various meters to be tested in the device to be tested 6.

[0079] In a further preferred embodiment, an insulation layer is provided around the test pipeline 4. Specifically, the insulation layer is made of rare earth material to reduce heat exchange during the flow of steam in the test pipeline 4, so that the steam quality remains stable, thereby reducing the impact on the test measurement.

[0080] In a further preferred embodiment, the pressure stabilizing mechanism 13 includes a first self-operated pressure regulating valve 1, a pressure stabilizing tank 3 and a second self-operated pressure regulating valve 2. The pressure stabilizing tank 3 is connected between the first self-operated pressure regulating valve 1 and the second self-operated pressure regulating valve 2, and the end of the second self-operated pressure regulating valve 2 away from the pressure stabilizing tank 3 is connected to the steam inlet end of the calibration pipeline 4. Preferably, a temperature transmitter and a pressure transmitter are connected in the pressure stabilizing mechanism 13. Among them, the uncertainty of the temperature transmitter is better than 0.2%, and the measurement range covers at least 0 to 300°C; the accuracy of the pressure transmitter is better than 0.075 level, and the measurement range covers at least 0 to 1.0MPa. In this embodiment, the temperature transmitter and the pressure transmitter are connected upstream of the first self-operated pressure regulating valve 1 and downstream of the pressure stabilizing tank 3.

[0081] In a further preferred embodiment, in combination with the attached Figure 2 As shown, a porous plate 16 is fixed inside the surge tank 3, and a stainless steel mesh 17 is fixed on the porous plate 16. The mesh of the stainless steel mesh 17 is firmly combined with the porous plate 16 to filter solid impurities in the steam and damp the steam pressure fluctuation. For the surge tank 3 itself, its internal design pressure is 1.4MPa~1.8MPa. More specifically, the design volume of the surge tank 3 is 10m 3 , diameter 1.8m, height 4.5m, design pressure 1.6MPa, wall thickness 12mm, material 16Mn. Stainless steel mesh 17 is 16 mesh, woven with stainless steel wire, stainless steel wire diameter 0.14mm, can be used to filter solid matter with a filter precision of 315μ, and the resistance coefficient ζ is 0.037.

[0082] It should be further explained that the pressure stabilizing tank 3, as one of the key components of the pressure stabilizing mechanism 13, is a key factor affecting the flow stability. At present, the pressure stabilizing tank of the air device has no internal structure in design, and the main consideration is whether the volume of the pressure stabilizing tank meets the design requirements. The pressure stabilizing tank of the liquid device is provided with a structure to reduce pressure fluctuations. The requirement of the pressure stabilizing tank of the steam device is to filter out the high-frequency pressure fluctuations and some low-frequency fluctuations generated by the steam source, which is the first pressure stabilizing device to ensure the stability of the device. The fluctuations are reduced by using the reflection of the pressure wave in the tank, the elasticity of the steam, the flow of the steam and the friction damping of the tank structure. When the pressure at the inlet of the tank fluctuates, the fluctuations are greatly reduced at the outlet through the above-mentioned pressure stabilizing effect. The filtering effect of the pressure stabilizing tank 3 on pressure fluctuations can be compared with the effect of the capacitor on filtering voltage fluctuations. The reduction of the amplitude and frequency of pressure fluctuations is related to the volume size, structure and position of the tank. In the preferred embodiment of this embodiment, a porous plate 16 is set at the 1 / 3 position of the lower bottom of the pressure stabilizing tank 3. That is, the distance between the porous plate 16 and the lower bottom of the pressure stabilizing tank 3 is a, and the distance between the porous plate 16 and the upper top of the pressure stabilizing tank 3 is b, wherein: a:b=1:2.

[0083] In a further preferred embodiment, the weighing mechanism 10 includes a commutator 9, a container 14, and a measuring scale 15 carrying the container 14. The commutator 9 has an inlet and two outlets, the inlet of the commutator 9 is connected to the condenser 8, and one of the outlets of the commutator 9 is connected to the container 14. In this embodiment, the condenser 8 is a spiral plate condenser, the commutator 9 is an open swing nozzle commutator, and the container 14 is made of 304 stainless steel.

[0084] The main function of the condenser 8 is to condense the high-temperature and high-pressure steam passing through the device to be tested 6 in the wet steam standard device into water at a certain temperature. In order to ensure the accuracy of the device to be tested 6, it is necessary to ensure that the discharged steam is completely condensed and all flows into the weighing mechanism 10. Therefore, the requirements for the condenser 8 require that the condensed water flows continuously without hanging on the wall during the condensation process. The condenser 8 needs to have a reasonable structural design, high heat transfer efficiency, and easy maintenance. In this embodiment, the spiral plate condenser used in the condenser 8 has a large heat transfer coefficient and a compact structure. The parameters such as the condensation heat exchange area, temperature, pressure, and pressure drop can meet the needs of the condensation method steam device. The fluid flow distance is relatively long and the heat exchange is relatively uniform. Specifically, the heat transfer coefficient K of the spiral plate condenser can reach more than 5000, which is 3-4 times that of an ordinary heat exchanger. The height is 2.5m, the space occupancy is small, and the heat exchange is uniform. In addition, in the spiral plate condenser, the process flows from bottom to top, the steam flows in from top to bottom, and the condensed water flows out from top to bottom, which ensures the complete condensation of the steam. The short process can also ensure continuous flow.

[0085] The commutator 9 adopts an open swing nozzle commutator made of 06Cr19Ni10 stainless steel. The uncertainty of the commutator 9 is less than or equal to 0.017% of the flow meter method, and the commutation time difference is less than or equal to 10ms. In order to ensure the stability of the gas source of the commutator 9 and the smooth commutation process, the commutator 9 can be equipped with a 50L gas storage mechanism and a pressure regulating valve. In this embodiment, a water storage mechanism 11 is also provided for receiving the condensed water directly discharged from the commutator 9, and the water storage mechanism 11 also provides water for spraying for the regulating mechanism 5, so that the condensed water returns to the wet steam standard device for circulation.

[0086] The container 14 is made of 304 stainless steel with a polished surface. The bottom of the container 14 is designed to be conical for drainage. A pneumatic butterfly valve is set below the bottom of the container 14. The pneumatic butterfly valve is opened to drain the water. The time required for all the water in the container 14 to be drained out is less than 30 seconds. The measuring scale 15 uses an electronic scale with an accuracy better than 1 / 5000, that is, the accuracy reaches more than 1 / 5000 of the full scale.

[0087] The steam discharged from the test pipeline 4 is condensed by the condenser 8, and the condensed water flows through the commutator 9. When the condensed water needs to be weighed, the condensed water is discharged into the container 14 by controlling the commutator 9, and when the condensed water does not need to be weighed, the condensed water is directly discharged by controlling the commutator 9.

[0088] Preferably, a temperature transmitter and a pressure transmitter are connected on the calibration pipeline 4 and between the device to be tested 6 and the steam outlet of the calibration pipeline 4 to measure the steam temperature and steam pressure after monitoring the device to be tested 6 and before entering the condenser 8 .

[0089] In a further preferred embodiment, the wet steam standard device also includes a superheated steam standard flowmeter 12, one end of which is connected to the steam inlet of the calibration pipeline 4, and the other end is connected to the pressure stabilizing mechanism 13. The superheated steam standard flowmeter 12 is used to monitor the flow of superheated steam entering the calibration pipeline 4, and a vortex flowmeter can be used specifically. The flow is monitored by the superheated steam standard flowmeter 12 before the superheated steam enters the calibration pipeline 4, and when it is detected that the flow is too large, timely feedback can be given to avoid safety hazards caused by excessive flow of steam entering the calibration pipeline 4. Preferably, a temperature transmitter and a pressure transmitter are connected between the superheated steam standard flowmeter 12 and the steam inlet of the calibration pipeline 4 to monitor the temperature and pressure of the steam before entering the calibration pipeline 4.

[0090] In a further preferred embodiment, the wet steam standard device further comprises a controller (not shown). The controller is electrically connected to the voltage stabilizing mechanism 13, the weighing mechanism 10 and the regulating mechanism 5. In this embodiment, the controller adopts a PLC control cabinet, which has data storage, processing analysis and feedback capabilities, and improves the degree of intelligence and human-computer interaction.

[0091] The present application also provides a method for tracing the source of the device to be tested 6, using the wet steam standard device as described above to trace the source of the device to be tested 6. Figure 3 As shown, the traceability method includes the following steps:

[0092] Preparatory step S1: pre-install the pressure stabilizing mechanism 13, the pressure reducing valve 7, the condenser 8 and the weighing mechanism 10, connect the pressure reducing valve 7, the condenser 8 and the weighing mechanism 10 in sequence, and reserve an installation distance between the pressure stabilizing mechanism 13 and the pressure reducing valve 7;

[0093] Installation step S2: obtaining the test pipeline 4, installing the device to be tested 6 and the regulating mechanism 5 on the test pipeline 4, connecting the steam inlet end of the test pipeline 4 to the pressure stabilizing mechanism 13, and connecting the steam outlet of the test pipeline 4 to the pressure reducing valve 7;

[0094] Test step S3: calibrate the voltage stabilizing mechanism 13 and the regulating mechanism 5, record the calibration data of the voltage stabilizing mechanism 13 and the regulating mechanism 5, and after the calibration is completed, introduce superheated steam into the wet steam standard device, and the superheated steam passes through the voltage stabilizing mechanism 13, the calibration pipeline 4 and the pressure reducing valve 7 in sequence, and then condenses through the condenser 8 to produce condensed water, and finally the mass of the condensed water is weighed by the weighing mechanism 10;

[0095] Data collection step S4: real-time collection and recording of steam quality characteristic parameter data monitored by the device to be tested 6, the steam quality characteristic parameters at least including steam quality and steam dryness; real-time collection and recording of weighing data of the weighing mechanism 10; real-time collection and recording of environmental data;

[0096] Data processing step S5: taking the weighing data of the weighing mechanism 10 and the monitoring data of the device to be tested 6 at any and the same time, and performing environmental compensation on the weighing data and the monitoring data according to the environmental data at the same time;

[0097] The weighing data of the weighing mechanism 10 after compensation is compared with the steam quality data monitored by the device to be tested 6 after compensation to obtain the calculated dryness value of the steam. The steam dryness data monitored by the device to be tested 6 after compensation is the measured dryness value of the steam. The error value is calculated by comparing the calculated dryness value of the steam with the measured dryness value.

[0098] Abnormal detection judgment step S6: judging whether the error value exceeds a preset threshold;

[0099] If yes, it is determined to be an abnormal event, detection is stopped, an alarm is issued, and a log recording step S8 is performed;

[0100] If not, proceed to the accuracy determination step S7;

[0101] Accuracy determination step S7: evaluating the error value and determining whether to re-measure;

[0102] If yes, repeat steps S3 to S6;

[0103] If not, then log recording step S8 is performed;

[0104] Logging step S8: Log the detection process, the recorded content includes calibration data, environmental data, weighing data before and after compensation, monitoring data before and after compensation, calculated dryness value data, measured dryness value data and abnormal events.

[0105] The wet steam standard device is used to trace the device 6 to be tested, simplifying the traceability process, reducing the operation steps and time, improving the efficiency and convenience of traceability, and reducing the complexity and error rate of manual operation. In addition, the controller is used for control and data processing, which enhances the intelligence and data management capabilities of the device and meets the industry's demand for high-precision intelligent steam equipment.

[0106] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0107] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0108] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A wet steam standard device for performing real-time measurement deviation verification on a device to be measured (6), characterized in that: The wet steam standard device comprises: A test pipeline (4), one end of the test pipeline (4) being a steam inlet and the other end being a steam outlet, a device to be tested (6) being connected to the test pipeline (4) and being located at one end close to the steam outlet, the device to be tested (6) being used for online real-time monitoring of the steam quality of the steam flowing in the test pipeline (4), the steam quality at least including steam quality and steam dryness; A pressure stabilizing mechanism (13), the pressure stabilizing mechanism (13) being connected to one end of the steam inlet of the test pipeline (4), the pressure stabilizing mechanism (13) being used to stabilize the pressure of the steam entering the test pipeline (4); a pressure reducing valve (7), the pressure reducing valve (7) being connected to the steam outlet of the inspection pipeline (4); a condenser (8), the condenser (8) being connected to an end of the pressure reducing valve (7) away from the inspection pipeline (4), the condenser (8) being used for condensing wet steam flowing out of the inspection pipeline (4); a weighing mechanism (10), the weighing mechanism (10) receiving condensed water generated in the condenser (8) and weighing the condensed water; and An adjusting mechanism (5) is connected to the testing pipeline (4) and is located at one end close to the steam inlet. The adjusting mechanism (5) is used to adjust the dryness of the steam flowing in the testing pipeline (4).

2. The wet steam standard device according to claim 1, characterized in that: The regulating mechanism (5) regulates the dryness of the wet steam to a range of 0.75 to 1.

0.

3. The wet steam standard device according to claim 1, characterized in that: The steam pressure in the test pipeline (4) ranges from 0.2Mpa to 0.5Mpa; Preferably, the calibration pipeline (4) is DN40, DN50 or DN80.

4. The wet steam standard device according to claim 1, characterized in that: The periphery of the inspection pipeline (4) is provided with a heat-insulating layer.

5. The wet steam standard device according to claim 1, characterized in that: The pressure stabilizing mechanism (13) comprises a first self-operated pressure regulating valve (1), a pressure stabilizing tank (3) and a second self-operated pressure regulating valve (2); the pressure stabilizing tank (3) is connected between the first self-operated pressure regulating valve (1) and the second self-operated pressure regulating valve (2); an end of the second self-operated pressure regulating valve (2) away from the pressure stabilizing tank (3) is connected to an end of the steam inlet of the inspection pipeline (4); Preferably, a temperature transmitter and a pressure transmitter are connected to the pressure stabilizing mechanism (13).

6. The wet steam standard device according to claim 5, characterized in that: A porous plate (16) is fixedly provided inside the pressure stabilizing tank (3), and a stainless steel mesh (17) is fixedly provided on the porous plate (16); Preferably, the distance between the porous plate (16) and the lower bottom of the pressure stabilizing tank (3) is a, and the distance between the porous plate (16) and the upper top of the pressure stabilizing tank (3) is b, wherein: a:b=1:2; Preferably, the internal design pressure of the pressure-stabilizing tank (3) is 1.4 MPa to 1.8 MPa.

7. The wet steam standard device according to claim 1, characterized in that: The weighing mechanism (10) comprises a commutator (9), a container (14), and a measuring scale (15) carrying the container (14); the commutator (9) has an inlet and two outlets; the inlet of the commutator (9) is connected to the condenser (8), and one of the outlets of the commutator (9) is connected to the container (14); Preferably, a temperature transmitter and a pressure transmitter are connected to the calibration pipeline (4) and located between the device to be tested (6) and the steam outlet of the calibration pipeline (4).

8. The wet steam standard device according to claim 1, characterized in that: The wet steam standard device further comprises a superheated steam standard flow meter (12), one end of the superheated steam standard flow meter (12) is connected to the steam inlet of the calibration pipeline (4), and the other end is connected to the pressure stabilizing mechanism (13), and the superheated steam standard flow meter (12) is used to monitor the flow of superheated steam entering the calibration pipeline (4); Preferably, a temperature transmitter and a pressure transmitter are connected between the superheated steam standard flow meter (12) and the steam inlet of the calibration pipeline (4).

9. The wet steam standard device according to claim 1, characterized in that: The wet steam standard device also includes a controller, which is electrically connected to the pressure stabilizing mechanism (13), the weighing mechanism (10) and the regulating mechanism (5).

10. A method for tracing the source of a device to be tested (6), characterized in that: The wet steam standard device according to any one of claims 1 to 9 is used to trace the device to be tested (6), and the method comprises the following steps: Preparatory step S1: pre-install the pressure stabilizing mechanism (13), the pressure reducing valve (7), the condenser (8) and the weighing mechanism (10), connect the pressure reducing valve (7), the condenser (8) and the weighing mechanism (10) in sequence, and reserve an installation distance between the pressure stabilizing mechanism (13) and the pressure reducing valve (7); Installation step S2: obtaining a test pipeline (4), installing the device to be tested (6) and the regulating mechanism (5) on the test pipeline (4), connecting the steam inlet end of the test pipeline (4) to the pressure stabilizing mechanism (13), and connecting the steam outlet end of the test pipeline (4) to the pressure reducing valve (7); Test step S3: calibrating the pressure stabilizing mechanism (13) and the regulating mechanism (5), recording the calibration data of the pressure stabilizing mechanism (13) and the regulating mechanism (5), and after the calibration is completed, introducing superheated steam into the wet steam standard device, the superheated steam passes through the pressure stabilizing mechanism (13), the calibration pipeline (4) and the pressure reducing valve (7) in sequence, and then condenses through the condenser (8) to produce condensed water, and finally the mass of the condensed water is weighed through the weighing mechanism (10); Data collection step S4: real-time collection and recording of steam quality characteristic parameter data monitored by the device to be tested (6), the steam quality characteristic parameters at least including steam quality and steam dryness; real-time collection and recording of weighing data of the weighing mechanism (10); real-time collection and recording of environmental data; Data processing step S5: taking the weighing data of the weighing mechanism (10) and the monitoring data of the device to be tested (6) at any and the same time, and performing environmental compensation on the weighing data and the monitoring data according to the environmental data at the same time; The weighing data of the compensated weighing mechanism (10) is compared with the steam quality data monitored by the compensated device to be tested (6) to obtain the calculated dryness value of the steam, the steam dryness data monitored by the compensated device to be tested (6) is the measured dryness value of the steam, and the error value is calculated by comparing the calculated dryness value of the steam with the measured dryness value; Abnormal detection judgment step S6: judging whether the error value exceeds a preset threshold; If yes, it is determined to be an abnormal event, detection is stopped, an alarm is issued, and a log recording step S8 is performed; If not, proceed to the accuracy determination step S7; Accuracy determination step S7: evaluating the error value and determining whether to re-measure; If yes, repeat steps S3 to S6; If not, then proceed to log recording step S8; Logging step S8: Log the detection process, the recorded content includes calibration data, environmental data, weighing data before and after compensation, monitoring data before and after compensation, calculated dryness value data, measured dryness value data and abnormal events.

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