Water-gas ratio detector

Abstract

The invention discloses a water-gas ratio detector which comprises a water-gas ratio sensor, a transmitting unit and a connecting assembly, the water-gas ratio sensor is a rigid probe rod composed of a pressure detection flow path, a differential pressure flow detection element and a temperature detection element, the appearance of the water-gas ratio sensor is in a reverse water drop shape, and a fluid facing surface is a parabolic surface; a back fluid surface is of a hyperboloid type, a plurality of groups of pressure tapping holes are formed according to an equal ring area method, and the pressure tapping holes are communicated with one another and are communicated with a detection pressure flow path; the multiple groups of pressure tapping holes in the fluid facing surface and the fluid backing surface are symmetrically arranged front and back; the temperature detection element is arranged at the geometric center of the rigid probe rod; the transmitting unit is a multi-parameter transmitter and can achieve transmitting, processing and operation of temperature signals, pressure signals and differential pressure signals. The water-gas ratio detector disclosed by the invention has the advantages of wide measuring range ratio, good linearity, low energy consumption and high precision, and is particularly suitable for detecting the moisture in water-containing mixed gas such as water gas and purified gas.

Description

Technical Field

[0001] The present invention relates to the technical field of water vapor detection, and in particular to a water vapor ratio detector. Background Art

[0002] The country vigorously promotes the clean and efficient use of coal. Modern coal chemical industry and green hydrogen industry are developing rapidly. The demand for automation and intelligence of coal chemical enterprises is constantly increasing. The quality of water gas and purified gas directly affects the design of downstream process flow. The detection and control of water-gas ratio are particularly important and critical. As one of the important detection parameters of process industry, the state clearly requires regular analysis of the water-gas ratio content of the conversion furnace at the beginning of 2024. As one of the key detection parameters for the safe production of synthetic ammonia and methanol enterprises, the detection of water-gas ratio is one of the key detection parameters to ensure the "safe, stable, long-term, full and excellent" operation of enterprises. The difficulty of its detection is higher than that of other thermal parameters. At present, there is a lack of measurement technology and products, especially water-gas ratio field detection instrument products, which are still blank in China. The detection and analysis of water content in various gases or mixed gases in process industry has not been well solved.

[0003] At present, the water-gas ratio is obtained by process engineers through manual deduction based on production experience and offline sampling and analysis in the laboratory. It cannot be detected and controlled online and in real time, which seriously affects the quality of the product gas. Summary of the invention

[0004] The invention discloses a water-gas ratio detector, aiming to solve the technical problem in the background technology that online and real-time detection and control cannot be realized, which seriously affects the quality of product gas.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A water-gas ratio detector comprises a water-gas ratio sensor, a transmission unit and a connecting assembly. The water-gas ratio sensor is a rigid probe rod composed of a detection pressure flow path, a detection differential pressure flow and a detection temperature element. The water-gas ratio sensor has an inverted water drop shape, a fluid-facing surface is a parabola, and a fluid-reversing surface is a hyperbolic surface. A plurality of groups of pressure-taking holes are arranged according to the equal annular area method, and each pressure-taking hole is interconnected and connected to the detection pressure flow path; the plurality of groups of pressure-taking holes on the fluid-facing surface and the fluid-reversing surface are arranged symmetrically front to back; the temperature detection element is arranged at the geometric center of the rigid probe rod; the transmission unit is a multi-parameter transmitter, which can realize the transmission, processing and calculation of temperature signals (RTD), pressure and differential pressure signals (AI electrical signals), and finally output a water-gas ratio signal of the measured fluid.

[0007] In a preferred solution, the connecting assembly is composed of a pipe seat, a pressure measuring valve group and a temperature assembly, and the connecting assembly is used to connect the water-gas ratio sensor and the transmitter unit. The connecting assembly is used to detect the transmission of the signal and is used for connection with the medium measurement pipeline.

[0008] In a preferred embodiment, the multi-point pressure measuring holes on the upstream side of the water-gas ratio sensor measure the total pressure, are connected to the total pressure pipeline, and lead out the average total pressure P1. The multi-point pressure measuring holes on the downstream side measure the static pressure, are connected to the static pressure pipeline, and lead out the static pressure P2. Through the output differential pressure △p=P1-P2 and the average velocity v of the fluid, it can be derived according to the classic Bernoulli equation that as long as the output differential pressure △p is effectively measured, and then the transmission unit multi-parameter transmitter is used to convert △p into a corresponding electrical signal, the flow value of the fluid can be measured.

[0009] In a preferred scheme, according to the generalized compression factor diagram of Hougen and Watson, the accuracy of Antoine's formula calculation for water vapor is corrected by using the compression factor to realize the water-gas ratio detection of the fluid. The temperature measuring component in the rigid probe rod of the water-gas ratio sensor detects the temperature signal RTD and sends it to the multi-parameter transmitter of the transmission unit to realize the temperature measurement of the detection medium.

[0010] As can be seen from the above, a water-gas ratio detector includes a water-gas ratio sensor, a transmission unit and a connecting assembly, wherein the water-gas ratio sensor is a rigid probe composed of a detection pressure flow path, a detection differential pressure flow and a detection temperature element, and the water-gas ratio sensor has an anti-water drop shape, a parabolic surface facing the fluid, and a hyperbolic surface facing the fluid, and multiple groups of pressure holes are arranged according to the equal annular area method, each pressure hole is interconnected and connected to the detection pressure flow path; multiple groups of pressure holes facing the fluid surface and the back fluid surface are arranged symmetrically front and back; the detection temperature element is arranged at the geometric center of the rigid probe; the transmission unit is a multi-parameter transmitter, which can realize the transmission, processing and calculation of temperature signals (RTD), pressure and differential pressure signals (AI electrical signals), and finally output the water-gas ratio signal of the measured fluid. The water-gas ratio detector provided by the present invention has a wide range ratio, good linearity, low energy consumption, high precision, and is particularly suitable for the measurement of water content in mixed gases such as water gas, conversion gas, and product gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of a water-gas ratio detector proposed in the present invention.

[0012] Figure 2 A sensor structure of a water-gas ratio detector proposed by the present invention Figure 1 .

[0013] Figure 3 A sensor structure of a water-gas ratio detector proposed by the present invention Figure 2 .

[0014] Figure 4 A three-dimensional diagram of a sensor of a water-gas ratio detector proposed in the present invention.

[0015] Figure 5 A three-dimensional plan view of a sensor of a water-gas ratio detector proposed in the present invention.

[0016] In the figure: 1. Water-gas ratio sensor; 2. Transmitter unit; 3. Connection assembly; 4. Pipe seat; 5. Pressure measuring valve group; 6. Temperature assembly. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Reference Figure 1-Figure 5 A water-gas ratio detector comprises a water-gas ratio sensor 1, a transmitter unit 2 and a connecting assembly 3, wherein the water-gas ratio sensor 1 is a rigid probe rod composed of a pressure detection path, a differential pressure flow detection and a temperature detection element, and the water-gas ratio sensor 1 has an inverted water drop shape, a fluid-facing surface is a parabola, and a fluid-rearward surface is a hyperbolic surface, and multiple groups of pressure-taking holes are arranged according to the equal annular area method, each pressure-taking hole is interconnected and connected to the pressure detection path; multiple groups of pressure-taking holes on the fluid-facing surface and the fluid-rearward surface are arranged symmetrically front to back; the temperature detection element is arranged at the geometric center of the rigid probe rod; the transmitter unit 2 is a multi-parameter transmitter, which can realize the transmission, processing and calculation of temperature signal RTD, pressure and differential pressure signal AI electrical signals, and finally output the water-gas ratio signal of the measured fluid.

[0019] In a preferred embodiment, the connecting component 3 is composed of a pipe seat 4, a pressure measuring valve group 5 and a temperature component 6, and the connecting component 3 is used to connect the water-gas ratio sensor 1 and the transmitting unit 3. The connecting component 3 is used to transmit the detection signal and is used for connection with the medium measuring pipeline.

[0020] In a preferred embodiment, the multi-point pressure measuring holes on the upstream side of the water-gas ratio sensor 1 measure the total pressure, are connected to the total pressure pipeline, and lead out the average total pressure P1. The multi-point pressure measuring holes on the rear side measure the static pressure, are connected to the static pressure pipeline, and lead out the static pressure P2. Through the output differential pressure △p=P1-P2 and the average velocity v of the fluid, it can be derived according to the classic Bernoulli equation that as long as the output differential pressure △p is effectively measured, and then the multi-parameter transmitter of the transmission unit 2 is used to convert △p into a corresponding electrical signal, the flow value of the fluid can be measured.

[0021] In a preferred embodiment, based on the generalized compressibility factor diagram of Hougen and Watson, the accuracy of Antoine's formula calculation for water vapor is corrected by using the compressibility factor to achieve the detection of the water-gas ratio of the fluid.

[0022] In a preferred embodiment, the temperature signal RTD detected by the temperature measuring component in the rigid probe rod of the water-gas ratio sensor 1 is sent to the multi-parameter transmitter of the transmitter unit 2 to achieve the temperature measurement of the detection medium.

[0023] In a preferred embodiment, for example, the water vapor ratio is calculated under the operating conditions of 240°C and 5.97MPa (process gas parameters at the outlet of the scrubbing tower): by looking up the thermodynamic property table, it can be obtained that the water vapor equilibrium pressure corresponding to 240°C is Pe=3.4138MPa.

[0024] Then compare the pressure:

[0025] Pr=Pe / Pc=3.4138 / 21.76=0.157

[0026] Where: Pe—equilibrium pressure of H2O, MPa;

[0027] Pc—critical pressure of H2O, MPa.

[0028] Comparison temperature:

[0029] Tr=T / Tc=(240+273) / 647.3=0.793

[0030] Where: Tc—critical temperature of H2O, K.

[0031] According to the generalized compression factor diagram of Hougen and Watson, the compression factor of water vapor under operating conditions can be obtained by looking up Pr and Tr.

[0032] Using the Antoine equation, the water-gas ratio at the outlet of the scrubber is:

[0033] Pe / Z / (P-Pe)=1.50

[0034] Where: P—operating pressure of the washing tower, MPa

[0035] Note: The expression of Antoine equation is:

[0036] logPv=AB / (C+t)

[0037] For water vapor, the values ​​of the constants A, B, and C are as follows:

[0038] A=7.07406

[0039] B=1657.16

[0040] C=227.02

[0041] The unit of vapor pressure Pv is KPa and the unit of temperature t is ℃.

[0042] According to the unit of the pressure instrument measurement value of the fluid medium, the Antoine equation is modified as follows:

[0043] log[(P+0.1)*1000]=AB / (C+t)

[0044] The values ​​of constants A, B and C are the same as above.

[0045] PWorking pressure of saturated water vapor, MPag

[0046] tSaturated steam temperature at this working pressure, ℃

[0047] Scope of application:

[0048] The applicable range of the Antoine equation for water vapor is 10-168°C, but through calculation, it is found that within the range of 17-298°C, the error of the formula is ≤1.00%. This error range is very accurate in engineering calculations. Therefore, the applicable range of the Antoine equation for water vapor can be changed to 10-300°C.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A water-gas ratio detector, characterized in that: The invention comprises a water-gas ratio sensor (1), a transmitter unit (2) and a connection assembly (3); the water-gas ratio sensor (1) is a rigid probe rod composed of a pressure detection flow path, a differential pressure detection flow and a temperature detection element; the water-gas ratio sensor (1) has an inverted water drop shape, a fluid-facing surface is a parabola, and a fluid-receiving surface is a hyperbolic surface; multiple groups of pressure-taking holes are arranged according to the equal annular area method, each of the pressure-taking holes is interconnected and connected to the pressure detection flow path; the multiple groups of pressure-taking holes on the fluid-facing surface and the fluid-receiving surface are arranged symmetrically front to back; the temperature detection element is arranged at the geometric center of the rigid probe rod; the transmitter unit (2) is a multi-parameter transmitter, which can realize the transmission, processing and calculation of temperature signals, pressure and differential pressure signals, and finally output a water-gas ratio signal of the measured fluid.

2. A water-gas ratio detector according to claim 1, characterized in that: The connecting component (3) is composed of a pipe seat (4), a pressure measuring valve group (5) and a temperature measuring component (6), and the connecting component (3) is used to connect the water-gas ratio sensor (1) and the transmission unit (3). The connecting component (3) is used for the transmission of detection signals and is used for connection with a medium measurement pipeline.

3. A water-gas ratio detector according to claim 2, characterized in that: The multi-point pressure measuring holes on the upstream side of the water-gas ratio sensor (1) measure the total pressure, are connected to the total pressure pipeline, and lead out the average total pressure P1. The multi-point pressure measuring holes on the downstream side measure the static pressure, are connected to the static pressure pipeline, and lead out the static pressure P2. Through the output differential pressure (△p=P1-P2) and the average velocity of the fluid (v), according to the Bernoulli equation, the output differential pressure △p is effectively measured, and then the transmission unit 2 is used to convert △p into a corresponding electrical signal to measure the flow value of the fluid.

4. A water-gas ratio detector according to claim 1, characterized in that: According to the generalized compression factor diagram of Hougen and Watson, the accuracy of Antoine's formula calculation for water vapor is corrected by compression factor to realize the detection of water-gas ratio of fluid.

5. A water-gas ratio detector according to claim 1, characterized in that: The temperature measurement component in the rigid probe rod of the water-gas ratio sensor (1) detects a temperature signal (RTD) and sends it to the transmission unit (2), thereby realizing the temperature measurement of the detection medium.

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