A saturated, supersaturated vapor humidity dual-state calibration method

Abstract

The present application is a kind of saturated, supersaturated steam humidity dual-state calibration method. The present application relates to the technical field of steam metering calibration, and the present application combines the salt content tracing characteristics of natural saturated steam and the salt content of fixed concentration in boiler water, and the working condition control logic of "pressure regulation to generate saturated steam with different humidity", to realize accurate calibration through a dual-path calibration system. Both branches pass through "isokinetic sampling + condensation + chloride ion / conductivity detection", and the initial salt content concentration of boiler water is used to convert the real mass moisture content as the calibration reference. The present application solves the problems of existing technology, such as complex dual-state calibration switching, no direct real humidity reference, and calibration error ≤0.5%, which is suitable for industrial steam metering equipment dual-condition calibration, and has the characteristics of convenient operation, controllable parameters and reliable reference.

Description

Technical Field

[0001] This invention relates to the field of steam metering and calibration technology, and is a dual-state calibration method for saturated and supersaturated steam humidity. Background Technology

[0002] Condensing boilers, as mainstream high-efficiency thermal equipment in the current industrial field, rely on the accurate measurement of saturated wet flue gas humidity parameters for thermal efficiency calculation, energy consumption assessment, and emission compliance testing. The calibration accuracy of the saturated wet flue gas humidity measuring device directly determines the reliability of the aforementioned key test results. However, current industry calibration technology for saturated wet flue gas humidity measuring devices for condensing boilers has significant shortcomings, and a mature solution adapted to actual operating conditions has not yet been developed. The core issues are concentrated in the following three aspects:

[0003] First, the calibration conditions are severely out of sync with actual operating conditions. Current mainstream humidity calibration methods are all designed based on unsaturated humid air environments. The calibration media, temperature and pressure parameters used differ significantly from the saturated / supersaturated humid flue gas conditions encountered in actual operation of condensing boilers. The humid flue gas discharged from condensing boilers is a typical saturated / supersaturated two-phase mixed system, in which liquid water particles are extremely small (mostly micrometers in size), unevenly distributed, and accompanied by dynamic fluctuations in temperature and pressure. Existing calibration techniques cannot simulate such complex conditions, resulting in calibration results that fail to objectively reflect the performance of the measuring device in actual applications, thus causing deviations in thermal performance test results.

[0004] Secondly, the calibration benchmark lacks directness and reliability. The actual wet flue gas emitted by condensing boilers does not contain salt. Existing calibration methods mostly rely on temperature and pressure conversions or indirect sensing to derive humidity values, failing to directly quantify the true liquid water content in the wet steam. Since liquid water and steam are in a two-phase mixture in the wet flue gas, accurately measuring the liquid water content has become a technical bottleneck in the industry. The calibration error of existing methods typically exceeds 2%, failing to meet the stringent measurement accuracy requirements for efficient operation of condensing boilers. Salt tracer, as an effective means of directly measuring liquid water, has not yet been applied to this type of calibration scenario.

[0005] Third, the lack of dual-state calibration capability and cumbersome operation. The humidity state of the wet flue gas in condensing boilers fluctuates with the operating load, covering two core operating conditions: saturation and supersaturation. However, existing technologies either can only achieve calibration for a single state or require significant adjustments to the system structure and replacement of the calibration medium to switch operating conditions, resulting in complex and inefficient operations. Furthermore, the lack of a precise control scheme to generate saturated wet flue gas with different humidity levels by adjusting the pressure within the boiler system fails to cover the multi-humidity calibration needs of condensing boilers in actual operation, further limiting the engineering practicality of the calibration technology.

[0006] In summary, existing calibration technologies, due to their poor adaptability to operating conditions, indirect reference, and lack of dual-state calibration capabilities, can no longer meet the precise calibration requirements of humidity measurement devices for saturated wet flue gas in condensing boilers. Developing a calibration method that is based on the natural characteristics of wet flue gas, adaptable to dual-state operating conditions, and easy to operate has become an urgent need to fill the technological gap in the industry and ensure the reliability of thermal performance testing of condensing boilers. Summary of the Invention

[0007] This invention aims to provide a dual-state calibration method for saturated / supersaturated steam humidity. It constructs a true humidity benchmark through the principle of "salt tracer" and generates saline saturated steam with different humidity levels by adjusting the pressure inside the steam generator. This solves the problems of complex dual-state calibration switching, unrealistic benchmark, and insufficient coverage of multiple humidity conditions in the prior art.

[0008] This invention provides the following technical solutions:

[0009] A dual-state calibration method for saturated and supersaturated vapor humidity, the method comprising the following steps:

[0010] Step 1: Set up a dual-path calibration system;

[0011] Step 2: Perform saturated steam calibration;

[0012] Step 3: Perform supersaturated steam calibration;

[0013] Step 4: Receive the actual mass moisture content data of the dual branches, compare it with the measured value of the calibrated device, and output the calibration result.

[0014] Preferably, the dual-path calibration system includes a steam generator, a saturated steam calibration branch, a supersaturated steam calibration branch, an isokinetic sampler, a condenser, a chloride / conductivity detection module, a data processing unit, and a boiler water supply unit containing a fixed concentration of salt.

[0015] The saturated steam calibration branch includes a pressure control module, a saturated steam delivery pipeline, and a temperature and pressure maintenance unit. The pressure control module directly adjusts the pressure inside the steam generator to achieve the generation of saturated steam with different humidity levels.

[0016] The supersaturated steam calibration branch includes a cyclone separator, heater, two high-precision mass flow meters, a homogenizing device, and a temperature and pressure holding unit, used to construct stable salt-containing supersaturated steam.

[0017] Preferably, after the steam generator is started, it outputs saline wet saturated steam, which enters the saturated steam branch; the steam pressure in the steam generator is adjusted by the pressure control module to generate saline wet saturated steam with the target humidity; after being stabilized by the temperature and pressure holding unit, it is delivered to the device being calibrated, and simultaneously diverted to the isokinetic sampler. After condensation, the salt content is detected, and the data processing unit calculates the true mass water content by combining the initial salt concentration of the boiler water, thus completing the calibration.

[0018] Preferably, the salt-containing wet saturated steam output from the steam generator is purified by a cyclone separator, heated to a superheat of 10~20°C by a heater, and then fully mixed with salt-containing boiler water measured by a high-precision mass flow meter in a uniform mixing device to form supersaturated steam containing salt water vapor. After being stabilized by a temperature and pressure holding unit, it is delivered to the calibration device, where it is simultaneously sampled and the salt content is detected. The actual mass water content is then calculated to complete the calibration.

[0019] Preferably, the salt concentration of the boiler water is fixed through pretreatment, with a chloride content ranging from 10 to 500 mg / L, and remains stable during calibration; the actual mass water content is calculated using the following formula:

[0020] ω=(S1 / S0)×100%

[0021] Wherein, S1 is the salt content of the condensate, and S0 is the initial salt concentration of the boiler water.

[0022] Preferably, the pressure control module adopts closed-loop feedback control, and the accuracy of adjusting the steam pressure in the steam generator is ≤ ±0.01MPa.

[0023] Preferably, the sampling speed of the isokinetic sampler is matched with the steam flow rate of the corresponding branch in real time, with a matching accuracy of ≥99.5%; the uniform mixing device is a turbulence blade type or a jet atomization type, with a mixing uniformity of ≥99%.

[0024] Preferably, the salt content of the wet saturated steam output by the steam generator comes from water droplets entrained in the boiler water, and the chloride content is positively correlated with the initial salt concentration of the boiler water; the final actual humidity of the saturated steam is determined by the salt content detection results.

[0025] A computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement a dual-state calibration method for saturated and supersaturated vapor humidity.

[0026] A computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement a dual-state calibration method for saturated and supersaturated vapor humidity.

[0027] The present invention has the following beneficial effects:

[0028] This invention is the first to combine the characteristic of "naturally salty wet saturated steam" with the principle of salt tracer to construct a direct detection benchmark and avoid indirect conversion errors.

[0029] This invention achieves precise pressure control: by utilizing the positive correlation between pressure and the humidity of saturated steam, steam with different humidity levels can be generated by adjusting the pressure inside the device, without the need to add extra water, and the operation is simple.

[0030] This invention achieves a dual-state integrated design: saturated and supersaturated steam calibration can be performed without changing equipment, with convenient switching and improved calibration efficiency by more than 30%;

[0031] This invention achieves high-precision control: relying on boiler water with a fixed salt concentration and a high-precision detection module, the actual humidity measurement error is ≤0.5%, and the calibration accuracy is significantly better than that of the prior art;

[0032] This invention is highly versatile: it is applicable to different types of steam humidity measuring equipment, and can meet the calibration needs of various scenarios such as industrial production and trade settlement, with a low operating threshold. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 The diagram shown is a structural block diagram of the saturated / supersaturated steam humidity dual-state calibration system of the present invention. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The present invention will be described in detail below with reference to specific embodiments. Specific Implementation Example 1:

[0038] according to Figure 1 As shown, the specific optimized technical solution adopted by the present invention to solve the above-mentioned technical problems is: The present invention relates to a dual-state calibration method for saturated and supersaturated steam humidity.

[0039] This invention provides a dual-state calibration method for saturated and supersaturated steam humidity, the method comprising the following steps:

[0040] Step 1: Set up a dual-path calibration system;

[0041] Step 2: Perform saturated steam calibration;

[0042] Step 3: Perform supersaturated steam calibration;

[0043] Step 4: Receive the actual mass moisture content data of the dual branches, compare it with the measured value of the calibrated device, and output the calibration result.

[0044] The dual-path calibration system includes a steam generator, a saturated steam calibration branch, a supersaturated steam calibration branch, an isokinetic sampler, a condenser, a chloride / conductivity detection module, a data processing unit, and a boiler water supply unit with a fixed concentration of salt.

[0045] The saturated steam calibration branch includes a pressure control module, a saturated steam delivery pipeline, and a temperature and pressure maintenance unit. The pressure control module directly adjusts the pressure inside the steam generator to achieve the generation of saturated steam with different humidity levels.

[0046] The supersaturated steam calibration branch includes a cyclone separator, heater, two high-precision mass flow meters, a homogenizing device, and a temperature and pressure holding unit, used to construct stable salt-containing supersaturated steam.

[0047] After the steam generator starts, it outputs saline wet saturated steam, which enters the saturated steam branch. The steam pressure in the steam generator is adjusted by the pressure control module to generate saline wet saturated steam with the target humidity. After being stabilized by the temperature and pressure holding unit, it is delivered to the device being calibrated and simultaneously diverted to the isokinetic sampler. After condensation, the salinity is detected. The data processing unit combines the initial salinity of the boiler water to calculate the true mass water content and completes the calibration.

[0048] The saline wet saturated steam output from the steam generator is purified by a cyclone separator, heated to a superheat of 10~20℃ by a heater, and then fully mixed with saline boiler water measured by a high-precision mass flow meter in a uniform mixing device to form saline supersaturated steam. After being stabilized by a temperature and pressure holding unit, it is sent to the calibration device, where it is simultaneously sampled and the salt content is detected. The actual mass water content is then calculated to complete the calibration.

[0049] The salt concentration of the boiler water was fixed through pretreatment, with chloride content ranging from 10 to 500 mg / L, and remained stable during calibration; the actual mass water content was calculated using the following formula:

[0050] ω=(S1 / S0)×100%

[0051] Wherein, S1 is the salt content of the condensate, and S0 is the initial salt concentration of the boiler water.

[0052] The pressure control module adopts closed-loop feedback control, and the accuracy of adjusting the steam pressure in the steam generator is ≤ ±0.01MPa.

[0053] The sampling speed of the isokinetic sampler is matched with the steam flow rate of the corresponding branch in real time, with a matching accuracy of ≥99.5%; the uniform mixing device is either a turbulence blade type or a jet atomization type, with a mixing uniformity of ≥99%.

[0054] The salt content of the wet saturated steam output by the steam generator comes from water droplets entrained in the boiler water, and the chloride content is positively correlated with the initial salt concentration of the boiler water; the final actual humidity of the saturated steam is determined by the salt content detection results.

[0055] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement a dual-state calibration method for saturated and supersaturated vapor humidity.

[0056] The present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement a dual-state calibration method for saturated and supersaturated steam humidity.

[0057] In summary, the core innovation of this invention lies in combining the salt tracer characteristics of naturally saline wet saturated steam and boiler water with a fixed salt concentration, with the operating condition control logic of "pressure regulation to generate saturated steam with different humidity levels," achieving precise calibration through a dual-path calibration system. The steam generator directly outputs saline wet saturated steam. The saturated steam branch generates steam with different humidity levels by adjusting the steam pressure (0.1~1.0MPa) within the device, utilizing the positive correlation between pressure and the water content of the wet saturated steam. The supersaturated steam branch establishes a stable operating condition by purifying and heating the steam and mixing it with saline boiler water. Both branches use "isotropic sampling + condensation + chloride / conductivity detection," combined with the initial salt concentration of the boiler water, to calculate the true mass water content as the calibration benchmark. This invention solves the problems of complex dual-state calibration switching and lack of a direct true humidity benchmark in existing technologies. The calibration error is ≤0.5%, suitable for dual-condition calibration of industrial steam metering equipment, and features convenient operation, controllable parameters, and reliable benchmarks. Specific Implementation Example 2:

[0059] The only difference between Embodiment 2 and Embodiment 1 of this application is that:

[0060] This invention belongs to the field of humidity measurement and calibration technology, specifically involving a dual-state calibration method for saturated / supersaturated steam humidity based on "salt tracer + pressure-controlled humidity". It utilizes the natural salt content of wet saturated steam to achieve accurate humidity measurement by detecting the salt content of boiler water carried in the steam. It is suitable for accurate dual-condition calibration of various steam humidity detection equipment.

[0061] The core of this invention is a combined design of "salt tracer + pressure-controlled humidity," constructing a dual-path parallel calibration system to achieve independent control and accurate detection under different steam states and humidity conditions. Specifically, it includes the following key steps:

[0062] (1) System composition

[0063] Steam generator: provides a source of wet saturated steam containing salt, with an output pressure adjustment range of 0.1~1.0MPa. The salt content of the steam originates from water droplets entrained in the boiler water.

[0064] Boiler water supply unit: Stores boiler water with a fixed concentration of salt, with chloride content controlled at 10~500mg / L to ensure stable salt concentration;

[0065] Saturated steam calibration branch: includes a pressure control module, saturated steam delivery pipeline, and temperature and pressure maintenance unit. The pressure control module directly adjusts the pressure inside the steam generator to achieve the generation of wet saturated steam with different humidity levels.

[0066] Supersaturated steam calibration branch: includes a cyclone separator, heater, two high-precision mass flow meters, uniform mixing device, and temperature and pressure holding unit, used to construct stable salt-containing supersaturated steam;

[0067] Detection modules: isokinetic sampler, condenser, chloride / conductivity detection module, used to capture salt in steam and detect concentration;

[0068] Data processing unit: Receives salinity detection data, calculates the actual mass water content by combining the initial salinity concentration of the boiler water, compares it with the data of the calibrated device, and outputs the calibration result.

[0069] (2) Core Principles

[0070] The wet saturated steam generated in the steam generator naturally carries boiler water droplets, which contain a fixed concentration of salt (characterized by chloride ions). Supersaturated steam is formed by mixing wet saturated steam with saline boiler water and also possesses salinity. By detecting the chloride content or conductivity of the steam condensate, the mass of boiler water carried in the steam can be deduced, thus obtaining the true moisture content, i.e.: True mass moisture content ω = (S1 / S0) × 100%, where S1 is the detected salt content of the condensate and S0 is the initial salt concentration of the boiler water.

[0071] Meanwhile, steam pressure and water entrainment are positively correlated: the higher the pressure, the stronger the steam's ability to carry water droplets, and the higher the humidity. By adjusting the pressure inside the steam generator, wet saturated steam with different humidity levels can be precisely generated to meet the calibration requirements of multiple operating conditions.

[0072] (3) Saturated steam calibration process

[0073] ① The steam generator starts up and directly outputs wet saturated steam containing salt, which enters the saturated steam branch;

[0074] ② The pressure control module adjusts the steam pressure in the steam generator to the target value (0.1~1.0MPa) according to the calibration requirements, generating wet saturated steam with the corresponding humidity;

[0075] ③ The adjusted wet saturated steam enters the saturated steam delivery pipeline, which has a built-in insulation structure to reduce parameter fluctuations;

[0076] ④ The steam flows through the temperature and pressure maintaining unit, and the saturated parameters are kept stable through heat preservation and pressure compensation technology to avoid state distortion;

[0077] ⑤ The stabilized wet saturated steam is delivered to the saturated state interface of the device being calibrated for humidity parameter calibration;

[0078] ⑥ A portion of the steam is simultaneously diverted to the isokinetic sampler, and the sampling speed is matched with the steam flow rate in real time (matching accuracy ≥ 99.5%) to ensure the representativeness of the sampling;

[0079] ⑦ After the sampled steam is liquefied by the condenser, the salt concentration (S1) of the condensate is detected by the chloride / conductivity detection module.

[0080] ⑧ The data processing unit calculates the true mass water content of the saturated steam according to the formula ω=(S1 / S0)×100%, and uses it as the calibration benchmark value.

[0081] (4) Supersaturated steam calibration process

[0082] ①The salt-containing wet saturated steam output from the steam generator enters the supersaturated steam branch and first passes through a cyclone separator to remove impurities and large droplets (separation efficiency ≥99.9%), in order to obtain pure steam and avoid the salt from interfering with the subsequent metering process;

[0083] ② The purified steam is heated by a heater, and the superheat is controlled at 10~20℃ to form stable superheated steam;

[0084] ③ After the superheated steam is metered by the first high-precision mass flow meter (accuracy ≥ 0.1%), it enters the uniform mixing device;

[0085] ④ The boiler water supply unit outputs boiler water with a fixed concentration of salt. After being heated to a superheat of 10~20℃, the flow rate is measured by a second high-precision mass flow meter (accuracy ≥0.1%) and synchronously delivered to the uniform mixing device.

[0086] ⑤ The superheated steam and the salt-containing boiler water are thoroughly mixed in the mixing device (mixing uniformity ≥99%) to form stable supersaturated steam;

[0087] ⑥ After the supersaturated steam is stabilized by the temperature and pressure holding unit, it is delivered to the supersaturated state interface of the device being calibrated for calibration.

[0088] ⑦ Using the same sampling, condensation, and detection process as the saturated steam branch, the salt concentration of the condensate (S1) was obtained. The true mass water content of the supersaturated steam was then calculated using the same formula and used as the calibration benchmark value.

[0089] (5) Calibration result output

[0090] The data processing unit compares the actual mass moisture content of the two branches with the measured value of the calibrated device, calculates the error value, generates a calibration report, and completes the calibration process.

[0091] The specific process of system setup is as follows:

[0092] The steam generating unit is an electrically heated boiler with a rated output pressure of 0.1~1.0MPa and a steam output of 50~200kg / h. The output steam is saline wet saturated steam, and the chloride content is positively correlated with the initial concentration of the boiler water.

[0093] The boiler water supply unit uses a stainless steel storage tank, equipped with a salt addition device and a stirring module, to fix the chloride concentration of the boiler water at 50 mg / L. During the calibration process, stability is maintained by monitoring the liquid level and concentration.

[0094] The pressure control module adopts a closed-loop control structure of electric regulating valve + pressure transmitter, with a regulation accuracy of ±0.01MPa;

[0095] The cyclone separator uses ceramic filter material, and its rated processing flow rate is matched with the steam generator, with a separation efficiency of ≥99.9%.

[0096] The heater is made of stainless steel, with a power adjustment range of 10~50kW and a superheat control accuracy of ±1℃.

[0097] The high-precision mass flow meter uses the Coriolis type, with a measurement range of 0~500 kg / h and an accuracy of ±0.1%.

[0098] The isokinetic sampler uses a pitot-type sampling head, with a sampling speed adjustment range of 0.5~5m / s and a matching accuracy of ≥99.5%.

[0099] The chloride / conductivity detection module has measurement accuracies of ±0.1 mg / L and ±0.1 μS / cm, respectively, and supports real-time data transmission.

[0100] Saturated steam calibration example:

[0101] ① Set the calibration pressure to 0.5MPa. After the steam generator starts and outputs steadily, the pressure control module adjusts the steam pressure in the device to 0.5MPa to generate salt-containing wet saturated steam with the corresponding humidity.

[0102] ② The insulation layer of the saturated steam transmission pipeline maintains a temperature of 151.8℃ (saturated temperature at 0.5MPa) to reduce steam state fluctuations;

[0103] ③ The temperature and pressure maintenance unit controls pressure fluctuations within ±0.01MPa and temperature fluctuations within ±0.5℃;

[0104] ④ The calibrated device measured and displayed a humidity of 5.2% by mass.

[0105] ⑤ The isokinetic sampler sampled at a speed of 2 m / s, and the chloride content of the condensate was found to be 2.55 mg / L after condensation;

[0106] ⑥ The data processing unit calculates the actual mass moisture content as 5.1% based on the formula ω=(2.55mg / L÷50mg / L)×100%;

[0107] ⑦ The calibration error is (5.2%-5.1%) / 5.1%≈1.96%. After correction by the calibrated device, the error is ≤0.5%, which meets the accuracy requirements.

[0108] Example of supersaturated steam calibration:

[0109] ①The salt-containing wet saturated steam output from the steam generator is purified by a cyclone separator and then heated to a superheat of 15°C by a heater (corresponding to a temperature of 166.8°C and a pressure of 0.5MPa).

[0110] ②The first mass flow meter measures a superheated steam flow rate of 100 kg / h;

[0111] ③ The boiler water supply unit outputs boiler water with a chloride concentration of 50 mg / L. After heating to 166.8℃, the second mass flow meter measures the boiler water flow rate as 10 kg / h, and the water enters the mixing device to mix with superheated steam.

[0112] ④ After mixing, supersaturated steam is formed. The temperature and pressure maintaining unit maintains a pressure of 0.5 MPa and a temperature of 155℃.

[0113] ⑤ The calibrated device measured and displayed a humidity of 12.3% by mass;

[0114] ⑥ After sampling and testing, the chloride content of the condensate was found to be 6.05 mg / L. The actual mass water content was calculated to be (6.05 mg / L ÷ 50 mg / L) × 100% = 12.1%.

[0115] ⑦ The calibration error is (12.3%-12.1%) / 12.1%≈1.65%, which meets the requirement of error ≤0.5% after correction.

[0116] The above description is merely a preferred embodiment of a dual-state calibration method for saturated and supersaturated steam humidity. The scope of protection for this dual-state calibration method is not limited to the above embodiments; all technical solutions falling within this conceptual framework are within the scope of protection of this invention. It should be noted that for those skilled in the art, any improvements and variations made without departing from the principles of this invention should also be considered within the scope of protection of this invention.

Claims

1. A dual-state calibration method for saturated and supersaturated steam humidity, characterized by: The method includes the following steps: Step 1: Set up a dual-path calibration system; Step 2: Perform saturated steam calibration; Step 3: Perform supersaturated steam calibration; Step 4: Receive the actual mass moisture content data of the dual branches, compare it with the measured value of the calibrated device, and output the calibration result.

2. The method according to claim 1, characterized in that: The dual-path calibration system includes a steam generator, a saturated steam calibration branch, a supersaturated steam calibration branch, an isokinetic sampler, a condenser, a chloride conductivity detection module, a data processing unit, and a boiler water supply unit containing a fixed concentration of salt. The saturated steam calibration branch includes a pressure control module, a saturated steam delivery pipeline, and a temperature and pressure maintenance unit. The pressure control module directly adjusts the pressure inside the steam generator to achieve the generation of saturated steam with different humidity levels. The supersaturated steam calibration branch includes a cyclone separator, heater, two high-precision mass flow meters, a homogenizing device, and a temperature and pressure holding unit, used to construct stable salt-containing supersaturated steam.

3. The method according to claim 2, characterized in that: After the steam generator starts, it outputs saline wet saturated steam, which enters the saturated steam branch. The steam pressure in the steam generator is adjusted by the pressure control module to generate saline wet saturated steam with the target humidity. After being stabilized by the temperature and pressure holding unit, it is delivered to the device being calibrated and simultaneously diverted to the isokinetic sampler. After condensation, the salinity is detected. The data processing unit combines the initial salinity of the boiler water to calculate the true mass water content and completes the calibration.

4. The method according to claim 3, characterized in that: The salt-containing wet saturated steam output from the steam generator is purified by a cyclone separator, heated to a superheat of 10~20℃ by a heater, and after being measured by a high-precision mass flow meter, it is fully mixed with salt-containing boiler water measured by the same precision flow meter in a uniform mixing device to form salt-containing supersaturated steam. After being stabilized by the temperature and pressure holding unit, the sample is sent to the device being calibrated, and the salt content is detected by simultaneous diversion sampling. The actual mass water content is then calculated to complete the calibration.

5. The method according to claim 4, characterized in that: The salt concentration of the boiler water was fixed through pretreatment, with chloride content ranging from 10 to 500 mg / L, and remained stable during calibration; the actual mass water content was calculated using the following formula: ω=(S1 / S0)×100% Wherein, S1 is the salt content of the condensate, and S0 is the initial salt concentration of the boiler water.

6. The method according to claim 5, characterized in that: The pressure control module adopts closed-loop feedback control, and the accuracy of adjusting the steam pressure in the steam generator is ≤ ±0.01MPa.

7. The method according to claim 6, characterized in that: The sampling speed of the isokinetic sampler is matched with the steam flow rate of the corresponding branch in real time, with a matching accuracy of ≥99.5%; the uniform mixing device is either a turbulence blade type or a jet atomization type, with a mixing uniformity of ≥99%.

8. The method according to claim 7, characterized in that: The salt content of the wet saturated steam output by the steam generator comes from water droplets entrained in the boiler water, and the chloride content is positively correlated with the initial salt concentration of the boiler water; the final actual humidity of the saturated steam is determined by the salt content detection results.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the method as claimed in any one of claims 1-8.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, it implements the method of any one of claims 1-8.

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