1. The utility model provides a novel gas-liquid two-phase flow metering device, its characterized in that, is equipped with measurement section (2) of entry (11) and export (12) respectively including vortex street transmitter (6), flow computer (7) and both ends, the one end that measurement section (2) inboard is close to entry (11) is equipped with vortex generator (1), the one end that measurement section (2) inboard is close to export (12) is equipped with throttle (5), still be equipped with compound differential pressure transmitter (3) and vortex street sensor (4) on measurement section (2) respectively, vortex street sensor (4) are connected with vortex street transmitter (6) electricity, compound differential pressure transmitter (3) and vortex street transmitter (6) all are connected with flow computer (7) electricity.

2. A novel gas-liquid two-phase flow measuring method is characterized by comprising the following steps:

step 10, fluid enters the measuring section (2) from the inlet (11) and generates a Karman vortex street signal through the vortex generator (1);

step 20, the vortex street sensor (4) measures the temperature of the fluid and outputs the measured temperature of the fluid to the vortex street transmitter (6);

step 30, the vortex street transmitter (6) collects the frequency of the probe of the vortex street sensor (4) and the signal intensity of the probe of the vortex street sensor (4), and outputs the collected frequency of the probe of the vortex street sensor (4) and the collected signal intensity of the probe of the vortex street sensor (4) to the flow computer (7);

step 40, measuring a fluid differential pressure and a fluid pressure by the composite differential pressure transmitter (3), and outputting the acquired fluid differential pressure and the acquired fluid pressure to the flow computer (7);

step 50, respectively calculating a fluid flow rate and a fluid density through a formula v ═ F (F) and a formula rho ═ F (F, H), wherein v is the fluid flow rate, F is the frequency of the probe of the vortex street sensor (4), rho is the fluid density, and H is the signal intensity of the probe of the vortex street sensor (4);

step 60, passing through a formula rho_g＝f(ρ_{Sign board}P, T) and ρ₁＝f(ρ_{Sign board}P, T) calculating the gas phase density of the fluid and the liquid phase density of the fluid, respectively, where P_gIs the gas phase density of the fluid, p_{Sign board}Is standard density, P is fluid pressure, T is fluid temperature, ρ_lIs the liquid phase density of the fluid;

step 70, passing the formulaCalculating the liquid content of the fluid, wherein LVF is the liquid content of the fluid, rho is the density of the fluid, and rho_lIs the density of the liquid phase of the fluid, p_gIs the gas phase density of the fluid;

80, respectively passing through the formulasQ_g＝Q_v1-LVF and Q_l＝Q_vLVF calculating the fluid liquid phase flow and the fluid gas phase flow, wherein Q_vIs the flow of liquid phase of the fluid, v is the flow velocity of the fluid, D is the cross-sectional area of the measuring section (2),Δ t is the time of the fluid passing through the measuring section (2), Q_gFor fluid gas phase flow, LVF is fluid liquid content, Q_lIs the flow rate of the liquid phase of the fluid;

step 90, passing the formulaCalculating differential pressure fluid liquid phase flow, wherein Q'_vThe differential pressure fluid liquid phase flow is adopted, k is a correction coefficient, delta P is the fluid differential pressure, and rho is the fluid density;

step 100, pass Q_vAnd Q'_vAnd carrying out synchronous comparison self-checking, carrying out data self-calibration and adjusting and calculating a flow state model if abnormity is found, and carrying out fault alarm if the data self-calibration does not pass.

Background

In recent years, multiphase flow measurement schemes are infinite, but in practical applications, there are more or less problems, for example, after two-phase fluids are mixed, because the flow state of a measured medium of the two-phase fluids is unknown, a computational model is used to have ideas, so that subsequent processing of data is influenced, a large measurement error occurs, and in addition, in measurement, the correctness of data analysis cannot be judged according to a measurement result, so that a result deviates from a real result to a far extent, and a final calculation result is influenced.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a novel gas-liquid two-phase flow metering device aiming at the defects of the prior art, and the more accurate gas phase flow and liquid phase flow can be obtained through calculation.

The technical scheme adopted by the invention is as follows: the utility model provides a novel gas-liquid two-phase flow metering device, is equipped with the measurement section of entry and export respectively including vortex street changer, flow computer and both ends, the one end that the measurement section inboard is close to the entry is equipped with vortex generating body, the one end that the measurement section inboard is close to the export is equipped with the throttle piece, still be equipped with compound differential pressure transmitter and vortex street sensor on the measurement section respectively, vortex street sensor is connected with vortex street changer electricity, compound differential pressure transmitter and vortex street changer all are connected with flow computer electromechanical.

The invention also discloses a novel gas-liquid two-phase flow metering method, which comprises the following steps:

step 10, enabling the fluid to enter a measuring section from an inlet, and generating a karman vortex street signal through a vortex generator;

step 20, the vortex street sensor measures the fluid temperature and outputs the measured fluid temperature to the vortex street transmitter;

step 30, the vortex street transmitter collects the frequency of the vortex street sensor probe and the signal intensity of the vortex street sensor probe, and outputs the collected frequency of the vortex street sensor probe and the signal intensity of the vortex street sensor probe to the flow computer;

step 40, the composite differential pressure transmitter measures fluid differential pressure and fluid pressure, and outputs the acquired fluid differential pressure and fluid pressure to a flow computer;

step 50, respectively calculating a fluid flow rate and a fluid density through a formula v ═ F (F) and a formula ρ ═ F (F, H), wherein v is the fluid flow rate, F is the frequency of the vortex street sensor probe, ρ is the fluid density, and H is the signal intensity of the vortex street sensor probe;

step 60, passing through a formula rho_g＝f(ρ_{Sign board}P, T) and ρ₁＝f(ρ_{Sign board}P, T) calculating the gas phase density of the fluid and the liquid phase density of the fluid, respectively, where p_gIs the gas phase density of the fluid, p_Marking:is standard density, P is fluid pressure, T is fluid temperature, ρ₁Is the liquid phase density of the fluid;

step 70, passing the formulaCalculating the liquid content of the fluid, wherein LVF is the liquid content of the fluid, rho is the density of the fluid, and rho₁Is the density of the liquid phase of the fluid, p_gIs the gas phase density of the fluid;

80, respectively passing through the formulasQ_g＝Q_v1-LVF and Q₁＝Q_vLVF calculating the fluid liquid phase flow and the fluid gas phase flow, wherein Q_vIs the flow of liquid phase of the fluid, v is the flow velocity of the fluid, D is the cross-sectional area of the measuring section (2), Δ t is the time for the fluid to pass through the measuring section, Q_gFor fluid gas phase flow, LVF is fluid liquid content, Q_lIs the flow rate of the liquid phase of the fluid;

step 90, passing the formulaCalculating differential pressure fluid liquid phase flow, wherein Q'_vThe differential pressure fluid liquid phase flow is adopted, k is a correction coefficient, delta P is the fluid differential pressure, and rho is the fluid density;

step 100, pass Q_vAnd Q'_vAnd carrying out synchronous comparison self-checking, carrying out data self-calibration and adjusting and calculating a flow state model if abnormity is found, and carrying out fault alarm if the data self-calibration does not pass.

The invention has the beneficial effects that: by measuring the frequency and signal intensity of the vortex street sensor probe and matching with the measured fluid differential pressure, fluid pressure and fluid temperature, the fluid gas phase flow and the fluid liquid phase flow can be calculated more accurately; meanwhile, the fluid phase flow of the differential pressure fluid can be calculated by substituting the fluid differential pressure; by comparing the fluid liquid phase flow with the differential pressure fluid liquid phase flow, the calculation flow state model can be adjusted in time, the metering precision is improved, and the reliability of data is guaranteed.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

In the figure: 1. a vortex generating body; 2. a measuring section; 3. a composite differential pressure transmitter; 4. a vortex street sensor; 5. a throttle member; 6. a vortex street transmitter; 7. a flow computer; 11. an inlet; 12. and (7) an outlet.

Detailed Description

The invention will be described in further detail with reference to the following drawings and specific embodiments.

As shown in fig. 1, a novel gas-liquid two-phase flow metering device comprises a vortex street transmitter 6, a flow computer 7 and a measuring section 2, wherein an inlet 11 and an outlet 12 are respectively arranged at two ends of the measuring section 2, a vortex generating body 1 is arranged at one end, close to the inlet 11, of the inner side of the measuring section 2, a throttling piece 5 is arranged at one end, close to the outlet 12, of the inner side of the measuring section 2, a composite differential pressure transmitter 3 and a vortex street sensor 4 are respectively arranged on the measuring section 2, the vortex street sensor 4 is electrically connected with the vortex street transmitter 6, and the composite differential pressure transmitter 3 and the vortex street transmitter 6 are both electrically connected with the flow computer 7.

The invention also discloses a novel gas-liquid two-phase flow metering method, which comprises the following steps:

step 10, fluid enters a measuring section 2 from an inlet 11 and generates a karman vortex street signal through a vortex generator 1;

step 20, the vortex street sensor 4 measures the fluid temperature and outputs the measured fluid temperature to the vortex street transmitter 6;

step 30, the vortex street transmitter 6 collects the frequency of the probe of the vortex street sensor 4 and the signal intensity of the probe of the vortex street sensor 4, and outputs the collected frequency of the probe of the vortex street sensor 4 and the collected signal intensity of the probe of the vortex street sensor 4 to the flow computer 7;

step 40, the composite differential pressure transmitter 3 measures fluid differential pressure and fluid pressure, and outputs the acquired fluid differential pressure and fluid pressure to the flow computer 7;

step 50, respectively calculating a fluid flow rate and a fluid density through a formula v ═ F (F) and a formula ρ ═ F (F, H), wherein v is the fluid flow rate, F is the frequency of the vortex street sensor 4 probe, ρ is the fluid density, and H is the signal intensity of the vortex street sensor 4 probe;

step 60, passing through a formula rho_g＝f(ρ_{Sign board}P, T) and ρ₁＝f(ρ_{Sign board}P, T) calculating the gas phase density of the fluid and the liquid phase density of the fluid, respectively, where p_gIs the gas phase density of the fluid, p_Marking:is standard density, P is fluid pressure, T is fluid temperature, ρ₁Is the liquid phase density of the fluid;

step 70, passing the formulaCalculating the liquid content of the fluid, wherein LVF is the liquid content of the fluid, rho is the density of the fluid, and rho₁Is the density of the liquid phase of the fluid, p_gIs the gas phase density of the fluid;

80, respectively passing through the formulasQ_g＝Q_v1-LVF and Q₁＝Q_vLVF calculating the fluid liquid phase flow and the fluid gas phase flow, wherein Q_vIs the flow of liquid phase of the fluid, v is the flow velocity of the fluid, D is the cross-sectional area of the measuring section (2), Δ t is the time of the fluid passing through the measuring section 2, Q_gFor fluid gas phase flow, LVF is fluid liquid content, Q_lIs the flow rate of the liquid phase of the fluid;

step 90, passing the formulaCalculating differential pressure fluid liquid phase flow, wherein Q'_vThe differential pressure fluid liquid phase flow is adopted, k is a correction coefficient, delta P is the fluid differential pressure, and rho is the fluid density;

step 100, pass Q_vAnd Q'_vAnd carrying out synchronous comparison self-checking, carrying out data self-calibration and adjusting and calculating a flow state model if abnormity is found, and carrying out fault alarm if the data self-calibration does not pass.

In the application, the vortex generating body 1 is used for generating a karman vortex street signal; the measuring section 2 is used for providing a stable fluid state environment; the composite differential pressure transmitter 3 is used for detecting a fluid flow signal and medium working pressure; the vortex street sensor 4 is used for detecting the impact frequency and intensity of the fluid generated behind the vortex generating body 1 and the vibration frequency and intensity of the process measuring pipe; the throttling element 5 is used for generating a throttling signal; the vortex street transmitter 6 is used for acquiring and calculating data of the vortex street sensor 4; the flow computer 7 is used for comprehensively analyzing and calculating the fluid flow, the phase fraction and relevant capacity data. Meanwhile, the novel gas-liquid two-phase flow metering device is vertically installed under the conventional condition, and the horizontal installation needs to be matched with a mixer for use.

The metering method of the novel gas-liquid two-phase flow metering device has the following principle: the strength of the generated signals of the fluid is different under the condition of different densities, and the larger the density of the fluid is, the stronger the generated signals are under the condition of the same flow speed; conversely, the lower the density, the weaker the signal produced. It is reflected in the amplitude of the vortex street sensor 4, and when under the same flow rate condition, the medium density is proportional to the sensor amplitude, and the larger the amplitude, the stronger the signal is generated. By Q_vAnd Q'_vAnd carrying out synchronous comparison and self-checking, carrying out data self-calibration when an abnormality is found, adjusting the calculation flow state model in time, and carrying out fault alarm when the self-checking cannot pass, so that problems can be found in advance, the metering precision is improved, and the reliability of the data is guaranteed.

The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.