An on-line measuring device for near-saturation high-temperature high-pressure gas humidity

Abstract

This invention discloses an online measurement device for the moisture content of near-saturated high-temperature and high-pressure gas, comprising: a pressure tap connected in sequence on a gas pipeline to a stainless steel coil, a four-way connector, an inlet pipe, and a humidity measurement container; a vent pipe connected to the four-way connector; an inlet pressure and temperature measuring point on the four-way connector; the inlet pressure and temperature measuring point connected to a data acquisition computer; a high-temperature inlet valve on the inlet pipe; and a humidity measurement container connected to an exhaust pipe. The humidity measurement container contains humidity, pressure, and temperature measuring points, each connected to the data acquisition computer. This invention prevents moisture from precipitating from the near-saturated high-temperature and high-pressure gas by cooling and depressurizing, allowing for real-time calculation of the gas moisture content and ensuring the accuracy of the measurement. This improves the working environment of conventional humidity sensors and successfully solves the problem of difficulty in measuring the moisture content of near-saturated high-temperature and high-pressure gas after humidification, significantly reducing costs.

Description

Technical Field

[0001] This invention relates to an online measurement device for the moisture content of near-saturated high-temperature and high-pressure gas, belonging to the field of online measurement technology. Background Technology

[0002] Gas turbines are advanced and complex sets of power machinery, typical high-tech intensive products. Using high-temperature gas as the working fluid, gas turbines convert the chemical energy of the fuel into mechanical and electrical energy through a constant-pressure heating cycle, and are widely used in oil and gas extraction and transportation, transportation, metallurgy, chemical industry, power generation, and shipbuilding. However, gas turbines produce large amounts of NOx (nitrogen oxides) during operation. To meet emission requirements, research teams have discovered that humidifying the inlet air can effectively reduce NOx emissions. To study the impact of air humidification on NOx emissions, the moisture content of the inlet air needs to be measured.

[0003] Because the gas at the combustion chamber inlet is nearly saturated, high-temperature, and high-pressure after humidification, conventional humidity sensors struggle to operate in such an environment. Currently, high-temperature, high-pressure gas humidity measurements are mostly based on steam humidity, with limited application to near-saturated, high-temperature, and high-pressure gases where the main phase is non-condensable. Existing patents propose measuring relative humidity through cooling and condensation. However, this method leads to condensation, severely impacting humidity measurement. In near-saturated, high-temperature, and high-pressure gas humidity measurement, cooling must be accompanied by pressure reduction. Pressure reduction lowers the relative humidity, cooling meets the temperature resistance requirements of the relative humidity measuring instrument, and pressure compensation improves the accuracy of converting relative humidity to moisture content (absolute humidity). Therefore, developing an online device for measuring the moisture content of near-saturated, high-temperature, and high-pressure gases is essential.

[0004] This invention addresses the issue of depressurization during the cooling of high-temperature, high-pressure gases. By optimizing the throttling and depressurization process and the length configuration of the cooling pipe section, it achieves non-condensation during cooling, relying solely on external environmental heat dissipation (radiation and natural convection heat transfer). No additional cold source is required. A built-in computer algorithm corrects the pressure online (compensating for pressure effects in moisture content conversion if atmospheric pressure is not reached after depressurization), effectively solving the aforementioned problems and avoiding the need for complex external cooling systems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the deficiencies mentioned in the background art by providing an online measurement device for the moisture content of near-saturated high-temperature and high-pressure gas.

[0006] In this invention, "near saturation" refers to a relative humidity of 90% or higher.

[0007] In this invention, "high temperature and high pressure" refers to a temperature above 100°C and a pressure higher than atmospheric pressure.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] An online measurement device for moisture content of near-saturated high-temperature and high-pressure gas includes a pressure tapping connector 1, a stainless steel coil 2, a four-way connector 3, a vent pipe 4-1, an inlet pipe 4-2, an exhaust pipe 4-3, a vent valve 5, a high-temperature inlet valve 6, a humidity measurement container 7, an exhaust valve 8, and a data acquisition computer 9.

[0010] The pressure tapping connector 1 includes a pressure tapping connector 1 arranged on the gas pipeline. The pressure tapping connector 1 arranged on the gas pipeline is sequentially connected to the stainless steel coil 2, the first end of the four-way connector 3, the second end of the four-way connector 3, the air inlet pipe 4-2, and the humidity measuring container 7. The third end of the four-way connector 3 is connected to the vent pipe 4-1. An air inlet pressure and temperature measuring point 10 is provided on the fourth end of the four-way connector 3. The air inlet pressure and temperature measuring point 10 is connected to the data acquisition computer 9. A high-temperature air inlet valve 6 is provided on the air inlet pipe 4-2. The humidity measuring container 7 is connected to the exhaust pipe 4-3. An exhaust valve 8 is provided on the exhaust pipe 4-3. The humidity measuring container 7 is provided with a humidity measuring point 11, a pressure measuring point 12, and a temperature measuring point 13. The humidity measuring point 11, the pressure measuring point 12, and the temperature measuring point 13 are respectively connected to the data acquisition computer 9.

[0011] Specifically, an online measurement device for the moisture content of near-saturated high-temperature and high-pressure gas includes a pressure-injecting connector 1, a stainless steel coil 2, a four-way connector 3, a vent pipe 4-1, an inlet pipe 4-2, an exhaust pipe 4-3, a vent valve 5, a high-temperature inlet valve 6, a humidity measuring container 7, an exhaust valve 8, and a data acquisition computer 9. The pressure-injecting connector 1 connects to the gas path to output the high-temperature and high-pressure gas flow. The stainless steel coil 2 is cooled and conducts the gas flow using air cooling. The four-way connector 3 is connected to the stainless steel coil 2 at the bottom, with pressure and temperature measuring points 10 arranged on the left, a vent valve 5 arranged on the right to control the inlet pressure, and a high-temperature inlet valve 6 arranged at the top to control the opening and closing of the inlet path. The valve and the connector are connected by the inlet pipe 4-1. The humidity measuring container 7 is used to store the cooled and depressurized gas. The exhaust valve 8 is used for venting and draining water. The data acquisition computer 9 is used to receive signals from the pressure and temperature measuring points 10, humidity measuring points 11, pressure measuring points 12, and temperature measuring points 13, and has a built-in online pressure correction program to directly calculate the moisture content of the high-temperature and high-pressure gas flow.

[0012] There are a total of 5 pressure taps 1, with 1 arranged in the air line and 4 arranged on the humidity measuring container 7.

[0013] The length of the stainless steel coil 2 can be extended according to the cooling effect.

[0014] The humidity measuring container 7 is a cylindrical cavity with one hole on each of the upper and lower bottom surfaces. There is a fixed bracket on the upper bottom surface, and the bracket surface has the same hole as the upper bottom surface. The hole on the lower bottom surface is connected to the exhaust pipe 4-3, and the exhaust pipe is equipped with an exhaust valve 8. There are three holes on the cylindrical surface, which are respectively connected to the pressure measuring point 12, the temperature measuring point 13, and the air inlet pipe 4-2. The front end of the air inlet pipe is equipped with a high-temperature air inlet valve 6.

[0015] The built-in online pressure correction program of the data acquisition computer 9 is as follows:

[0016]

[0017] Where d represents the moisture content in kg / kg; The relative humidity % in container 7 is measured; P s1 P1 is the saturated water vapor pressure (bar) in humidity measuring container 7; P2 is the gas pressure (bar) in humidity measuring container 7.

[0018] Beneficial effects:

[0019] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0020] This invention discloses an online moisture content measurement device for near-saturated high-temperature and high-pressure gases. High-temperature gas is drawn out of a pipeline via a pressure-inducing connector and guided through a stainless steel coil, effectively reducing the gas's temperature and pressure. This prevents moisture from precipitating out of the near-saturated high-temperature and high-pressure gas. The device calculates the gas moisture content in real time based on the relative humidity in a humidity measurement container, ensuring the accuracy of the moisture content measurement. This device improves the working environment of conventional humidity sensors and successfully solves the problem of difficulty in measuring the moisture content of near-saturated high-temperature and high-pressure gases after humidification, significantly reducing costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an online measurement device for the moisture content of near-saturated high-temperature and high-pressure gas according to the present invention.

[0022] In the diagram, 1-pressure tapping connector, 2-stainless steel coil, 3-four-way connector, 4-1-vent pipe, 4-2-inlet pipe, 4-3-exhaust pipe, 5-vent valve, 6-high temperature inlet valve, 7-humidity measuring container, 8-exhaust valve, 9-data acquisition computer, 10-inlet pressure and temperature measuring point, 11-humidity measuring point, 12-pressure measuring point, 13-temperature measuring point. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] like Figure 1As shown, an online measurement device for the humidity content of near-saturated high-temperature and high-pressure gas includes a pressure-injecting connector 1, a stainless steel coil 2, a four-way connector 3, a vent pipe 4-1, an inlet pipe 4-2, an exhaust pipe 4-3, a vent valve 5, a high-temperature inlet valve 6, a humidity measuring container 7, an exhaust valve 8, and a data acquisition computer 9. The pressure-injecting connector 1, arranged on the gas pipeline, is sequentially connected to the stainless steel coil 2, the first end of the four-way connector 3, the second end of the four-way connector 3, the inlet pipe 4-2, and the humidity measuring container 7. A high-temperature inlet valve 6 is installed on the inlet pipe 4-2. The third end of the four-way connector 3 is connected to the vent pipe 4-1. A vent valve 5 is installed on the vent pipe 4-1. An inlet pressure and temperature measuring point 10 is installed on the fourth end of the four-way connector 3. The inlet pressure and temperature measuring point 10 is connected to the data acquisition computer 9, outputting inlet pressure and temperature signals to the data acquisition computer 9. The humidity measuring container 7 is connected to the exhaust pipe 4-3, and an exhaust valve 8 is installed on the exhaust pipe 4-3. The humidity measuring container 7 is equipped with a humidity measuring point 11, a pressure measuring point 12, and a temperature measuring point 13. These measuring points are connected to a data acquisition computer 9. Humidity measuring point 11 outputs a humidity signal to the data acquisition computer 9. Pressure measuring point 12 outputs a pressure signal to the data acquisition computer 9. Temperature measuring point 13 outputs a temperature signal to the data acquisition computer 9.

[0025] The pressure tapping connector 1 has a pressure tapping interface at one end and a pressure outlet interface at the other end. The pressure outlet interface is a ball-shaped tube connector and is equipped with a clamping nut.

[0026] A pressure tapping connector 1, installed on the gas pipeline, is welded to the upper surface of the pipeline. The pressure tapping interface is flush with the inner wall of the gas pipeline. The pressure outlet interface is secured to the ball-shaped tube connector and the stainless steel coil 2 using a clamping nut, responsible for discharging the high-temperature, high-pressure gas flow from the pipeline. By drawing the high-temperature, high-pressure gas out of the pipeline through the pressure tapping connector and guiding it through the stainless steel coil 2, the temperature and pressure of the gas are effectively reduced, improving the operation of conventional humidity sensors. The gas pipeline is a high-temperature, high-pressure gas flow pipeline, through which a high-temperature, high-pressure gas flow is introduced.

[0027] Preferably, there are five pressure taps 1, one on the gas pipeline and four on the humidity measuring container 7. The installation method of the pressure taps on the humidity measuring container 7 is the same as that on the gas pipeline. The installation method of the pressure taps on the humidity measuring container 7 is as follows: the pressure tap 1 is welded to the upper surface of the humidity measuring container 7, the pressure tapping interface is aligned with the inner wall of the humidity measuring container 7, and the pressure outlet interface can be tightened to the ball-shaped tube connector and the corresponding connecting pipe through a tightening nut. Of the four pressure taps 1 arranged on the humidity measuring container 7, the first pressure tap is connected to the exhaust valve 8; the humidity measuring point 11 extends into the humidity measuring container 7 through the second pressure tap, the pressure measuring point 12 extends into the humidity measuring container 7 through the third pressure tap, and the temperature measuring point 13 extends into the humidity measuring container 7 through the fourth pressure tap.

[0028] The stainless steel coil 2 is cooled and conducts airflow using air cooling;

[0029] Preferably, the length of the stainless steel coil 2 can be extended according to the cooling effect.

[0030] The lower part of the four-way connector 3 is connected to the stainless steel coil 2. The left part is arranged with pressure and temperature measuring points 10, using a single-point total temperature and total pressure probe, installing an N-type armored thermocouple, leading out a thermocouple compensation wire to give a temperature signal, and using a pressure tapping tube to give a pressure signal. The right part is arranged with a vent valve 5 to control the intake pressure. The upper part is arranged with a high-temperature intake valve 6 to control the opening and closing of the intake path. The high-temperature intake valve 6 and the four-way connector 3 are connected by an intake pipe 4-2.

[0031] The humidity measuring container 7 is a cylindrical cavity used to store the cooled and depressurized gas. It has one hole on each of the top and bottom surfaces. There is a fixed bracket on the top surface, and the bracket has the same hole as the top surface. The bottom surface has a hole connected to the exhaust pipe 4-3, and the exhaust pipe is equipped with an exhaust valve 8. The cylindrical surface has three holes, which are respectively connected to the pressure measuring point 12, the temperature measuring point 13, and the air inlet pipe 4-2. The front end of the air inlet pipe is equipped with a high-temperature air inlet valve 6.

[0032] The exhaust valve 8 is used for venting and draining water;

[0033] The data acquisition computer 9 is used to receive signals from pressure and temperature measuring points 10, humidity measuring points 11, pressure measuring points 12, and temperature measuring points 13, and has a built-in online pressure correction program to directly calculate the moisture content of the high-temperature and high-pressure airflow.

[0034] Preferably, the humidity measuring point 11 uses a Vaisala humidity sensor to provide a humidity signal, the pressure measuring point 12 uses a pressure tube to provide a pressure signal, and the temperature measuring point 13 uses an N-type armored thermocouple with a thermocouple compensation wire leading out to provide a temperature signal.

[0035] The operation method and steps of the online moisture content measurement device for high-temperature and high-pressure gases are as follows:

[0036] Step 1: Close the high-temperature air inlet valve 6 above the four-way connector 3, open the vent valve 5 on the right side of the four-way connector, and measure the temperature and pressure of the high-temperature and high-pressure airflow in the pipeline.

[0037] Step 2: Adjust the opening of the right vent valve 5 according to the temperature and pressure received by the data acquisition computer 9, so that the temperature and pressure of the gas entering the humidity measurement container 7 are within the working range of the humidity sensor.

[0038] Step 3: Open the high-temperature air inlet valve 6 above the four-way connector and the exhaust valve 8 of the humidity measuring container 7 to allow gas to enter and collect humidity, pressure and temperature signals inside the humidity measuring container 7.

[0039] Step 4: The online pressure correction program built into the data acquisition computer 9 can calculate the moisture content of the gas in the humidity measurement container 7 in real time, that is, the moisture content of the high temperature and high pressure airflow.

[0040] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0041] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An operating method for an online measurement device for the moisture content of near-saturated high-temperature and high-pressure gas, characterized in that, The device includes a pressure tap (1), a stainless steel coil (2), a four-way connector (3), a vent pipe (4-1), an air inlet pipe (4-2), an exhaust pipe (4-3), a vent valve (5), a high-temperature air inlet valve (6), a humidity measuring container (7), and an exhaust valve (8). The pressure tapping connector (1) includes a pressure tapping connector arranged on the gas pipeline, which is sequentially connected to a stainless steel coil (2), the first end of a four-way connector (3), the second end of the four-way connector (3), an air inlet pipe (4-2), and a humidity measuring container (7); the third end of the four-way connector (3) is connected to a vent pipe (4-1), and a vent valve (5) is installed on the vent pipe (4-1); an air inlet pressure and temperature measuring point (10) is installed on the fourth end of the four-way connector (3); the air inlet pressure and temperature measuring point (10) is connected to a number of... The data acquisition computer (9) is equipped with a high-temperature air inlet valve (6) on the air inlet pipe (4-2); the humidity measuring container (7) is connected to the exhaust pipe (4-3), and the exhaust pipe (4-3) is equipped with an exhaust valve (8); the humidity measuring container (7) is equipped with a humidity measuring point (11), a pressure measuring point (12) and a temperature measuring point (13); the humidity measuring point (11), the pressure measuring point (12) and the temperature measuring point (13) are respectively connected to the data acquisition computer (9); the stainless steel coil (2) is cooled and conducts airflow by air cooling; The operation method includes the following steps: Step 1: Close the high temperature inlet valve (6) above the four-way connector (3), open the vent valve (5) on the right side of the four-way connector, and measure the temperature and pressure of the high temperature and high pressure airflow in the pipeline; Step 2: Adjust the opening of the right vent valve (5) according to the temperature and pressure received by the data acquisition computer (9) so that the temperature and pressure of the gas entering the humidity measurement container (7) are within the working range of the humidity sensor. Step 3: Open the high-temperature air inlet valve (6) above the four-way connector and the exhaust valve (8) of the humidity measuring container (7) to allow gas to enter and collect the humidity, pressure and temperature signals inside the humidity measuring container (7); Step 4: The humidity content of the gas in the humidity measuring container (7), i.e. the humidity content of the high temperature and high pressure airflow, can be calculated in real time according to the online pressure correction program built into the data acquisition computer (9).

2. The operating method according to claim 1, characterized in that, The pressure tapping connector (1) has a pressure tapping interface at one end and a pressure outlet interface at the other end; the pressure outlet interface is a ball-shaped tube nozzle and is equipped with a clamping nut.

3. The operating method according to claim 2, characterized in that, The pressure tapping connector (1) arranged on the gas pipeline is welded to the upper surface of the gas pipeline. The pressure tapping interface is aligned with the inner wall of the gas pipeline. The pressure outlet interface is tightened with a compression nut to press the ball tube nozzle and the stainless steel coil (2).

4. The operating method according to claim 2, characterized in that, The pressure tap (1) also includes a pressure tap arranged in the humidity measuring container (7). There are four pressure taps arranged in the humidity measuring container (7), of which the first pressure tap is connected to the exhaust pipe (4-3); the humidity measuring point (11) extends into the humidity measuring container (7) through the second pressure tap, the pressure measuring point (12) extends into the humidity measuring container (7) through the third pressure tap, and the temperature measuring point (13) extends into the humidity measuring container (7) through the fourth pressure tap.

5. The operating method according to claim 1, characterized in that, The pressure and temperature measuring point (10) uses a single-point total temperature and total pressure probe, installs an N-type armored thermocouple, leads out a thermocouple compensation wire to give a temperature signal, and uses a pressure tube to give a pressure signal.

6. The operating method according to claim 1, characterized in that, The humidity measuring container (7) is a cylindrical cavity with one hole on each of the upper and lower bottom surfaces. There is a fixed bracket on the upper bottom surface, and the bracket surface has the same hole as the upper bottom surface. The lower bottom surface is connected to the exhaust pipe (4-3), and the exhaust pipe is equipped with an exhaust valve (8). The cylindrical surface has three holes, which are respectively connected to the pressure measuring point (12), the temperature measuring point (13), and the air inlet pipe (4-2). The front end of the air inlet pipe is equipped with a high-temperature air inlet valve (6).

7. The operating method according to claim 1, characterized in that, The exhaust valve (8) is used for venting and draining water.

8. The operating method according to claim 1, characterized in that, The data acquisition computer (9) is used to receive signals from pressure and temperature measuring points (10), humidity measuring points (11), pressure measuring points (12), and temperature measuring points (13), and has a built-in online pressure correction program to directly calculate the moisture content of the high-temperature and high-pressure airflow.

9. The operating method according to claim 1, characterized in that, The humidity measuring point (11) uses a Vasala humidity sensor to give a humidity signal, the pressure measuring point (12) uses a pressure tube to give a pressure signal, and the temperature measuring point (13) uses an N-type armored thermocouple, with a thermocouple compensation wire leading out to give a temperature signal. The built-in online pressure correction program of the data acquisition computer (9) is as follows: in, d Moisture content (kg / kg); The relative humidity in the humidity measuring container (7) is % P s1 The saturated water vapor pressure (bar) in the humidity measuring container (7); P 1 represents the gas pressure bar in the humidity measuring container (7).

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