CN105973351A - Supersonic gas-liquid separator test and experiment system - Google Patents

Abstract

The invention discloses a supersonic gas-liquid separator testing and experimental system, the purpose of which is to conduct in-depth research on the flow field by using the obtained experimental data to verify related theories for relevant experiments of the supersonic gas-liquid separator. Engineering practice provides a reliable basis, the adopted technical scheme is: including the atomization device connected to the gas-liquid inlet of the supersonic gas-liquid separator, the atomization device includes a liquid circuit for generating atomized liquid and a The gas path, liquid path and gas path are all connected to the buffer, and the gas-liquid outlet of the buffer is connected to the gas-liquid inlet of the supersonic gas-liquid separator; the supersonic gas-liquid separator includes a nozzle with a throat, and a diffuser The liquid outlet of the supersonic gas-liquid separator is connected to a liquid collection device, and the gas outlet of the supersonic gas-liquid separator is connected to a gas collection device; temperature sensors, pressure sensors, flow meters and valves are installed in various parts of the system.

Description

Supersonic gas-liquid separator test and experiment system

technical field

The invention relates to the field of supersonic gas-liquid separators, in particular to a testing and experiment system for supersonic gas-liquid separators.

Background technique

In the process of researching the supersonic air separator, it is very necessary to use a special experimental system to conduct comprehensive parameter tests and performance experiments to further improve the design and manufacture of the supersonic separator, to test its working performance and to achieve the design index. link. The current supersonic gas-liquid separator research is mainly based on theoretical design and software simulation, lacking a complete experimental system. At the same time, among the existing research results, there are many software simulation results, and relatively few experimental research results.

For the results of software simulation, due to the influence of many factors such as software settings and model simplification, the simulation results have great uncertainty or incompleteness. Software simulation usually needs to be demonstrated by experimental research results to be more credible Spend. At the same time, only through experiments can a more complete and true reflection of the results of theoretical research.

Contents of the invention

In order to solve the problems in the prior art, the present invention proposes a method that can complete related experiments on the supersonic gas-liquid separator, and use the obtained experimental data to conduct in-depth research on the flow field, verify relevant theories, and provide reliable basis for engineering practice. The supersonic gas-liquid separator test and experiment system.

In order to achieve the above object, the technical scheme adopted in the present invention is: comprise the atomizing device that is connected with the gas-liquid inlet of supersonic gas-liquid separator, and the atomizing device comprises the liquid path that is used to produce atomized liquid and is used to generate high pressure The gas path of the gas, the liquid path and the gas path are connected to the buffer, and the gas-liquid outlet of the buffer is connected to the gas-liquid inlet of the supersonic gas-liquid separator; the supersonic gas-liquid separator includes a nozzle with a throat pipe, and a diffuser tube, the liquid outlet of the supersonic gas-liquid separator is connected with a liquid collection device, and the gas outlet of the supersonic gas-liquid separator is connected with a gas collection device; the outlet of the liquid circuit and the outlet of the gas circuit , the outlet of the nozzle, the inlet of the diffuser, the liquid outlet of the supersonic gas-liquid separator, and the gas outlet of the supersonic gas-liquid separator are all provided with temperature sensors and pressure sensors, the supersonic gas-liquid separator The throat is provided with a temperature sensor, the liquid inlet of the buffer, the gas inlet of the buffer, the gas-liquid inlet of the supersonic gas-liquid separator, and the liquid outlet of the supersonic gas-liquid separator are all provided with flowmeters, and the liquid The outlet of the gas path, the outlet of the gas path, the gas-liquid inlet of the supersonic gas-liquid separator, the liquid outlet of the supersonic gas-liquid separator and the gas outlet of the supersonic gas-liquid separator are all provided with valves.

The liquid circuit includes a water storage tank, a water pump and an atomizing nozzle connected in sequence, the atomizing nozzle is arranged on the liquid inlet of the buffer, the temperature sensor and the pressure sensor are arranged at the outlet of the water pump, and the flow meter is arranged at the inlet of the atomizing nozzle , A valve is set between the flow meter and the water pump.

The flowmeters at the inlet of the atomizing nozzle and the liquid outlet of the supersonic gas-liquid separator all adopt orifice flowmeters.

The gas path includes an air compressor and an air storage tank connected in sequence, a temperature sensor and a pressure sensor are arranged at the outlet of the air storage tank, and a valve is arranged between the gas inlet of the buffer and the outlet of the air storage tank.

The flow meter of the buffer gas inlet is a compressed air flow meter.

The flowmeter at the gas-liquid inlet of the supersonic gas-liquid separator adopts a precession vortex flowmeter.

The precession vortex flowmeter is arranged at the front end of the gas-liquid inlet of the supersonic gas-liquid separator, which is 5 times the diameter of the pipeline.

The temperature sensors at the throat and the outlet of the nozzle adopt temperature sensors that can withstand low temperature and high pressure, the working temperature is -100°C to 50°C, and the withstand pressure is 20MPa.

The temperature sensor of the throat adopts a screw head sensor.

The valves, flow meters, temperature sensors and pressure sensors are all connected to a PLC controller.

Compared with the prior art, in the atomization device of the present invention, a pressure sensor, a temperature sensor and a flowmeter are respectively arranged on the liquid path and the gas path, mainly for the purpose of adjusting the inlet parameters of the supersonic gas-liquid separator, and collecting supersonic energy through the flowmeter. The wet air flow rate at the inlet of the sonic separator, use the liquid collection device to collect the liquid separated from the gas and liquid, weigh the liquid mass and combine the experiment time to get the liquid flow rate at the outlet, use the temperature sensor to measure the throat, nozzle outlet, and diffuser inlet and the temperature of the gas and liquid outlets. Whether the throat can reach the speed of sound is the key to the separation. The measurement of the velocity value of the throat is very important. The size of the throat is small and the pressure is high. It is difficult for existing instruments to meet the speed measurement directly. The throat velocity value needs to be converted by other measured values. The low temperature performance of the supersonic separator has an important reference value. Therefore, a temperature sensor is installed in the throat for measurement, and the throat temperature value is used according to the aerodynamic relationship. Calculate the velocity value of the throat, use the pressure sensor to measure the pressure at the outlet of the nozzle, the inlet of the diffuser tube, the gas phase outlet of the separator, and the liquid phase outlet, and calculate the relevant formula according to the parameters collected by the temperature, pressure sensor and flow meter, The experimental parameters of the supersonic gas-liquid separator are obtained. The experimental parameters are divided into operating parameters and performance parameters. The operating parameters are used to set different working conditions. The main operating parameters include liquid concentration and pressure ratio, performance parameters It is used to characterize the performance of the supersonic gas-liquid separator. The main performance parameters include separation efficiency and temperature drop. The invention can complete related experiments on the supersonic gas-liquid separator, and use the obtained experimental data to analyze the flow field. Carry out in-depth research, verify relevant theories, and provide a reliable basis for engineering practice.

Furthermore, the flow of wet air at the gas-liquid inlet of the supersonic gas-liquid separator is measured by a high-pressure natural gas flowmeter, which belongs to the intelligent precession vortex flowmeter, and is mainly measured by the Karman vortex street principle. In order to reduce the influence of the measuring instrument, the instrument The installation position is buffered with a length 5 times the diameter of the pipe from the front end of the separator inlet to further improve the accuracy of the collected data of the flowmeter.

Furthermore, the velocity of the moist air entering the supersonic gas-liquid separator changes sharply at the throat, reaching supersonic speed at the throat, the temperature of the humid air drops rapidly at the throat, and the pressure rises rapidly, which requires the throat of the nozzle to be in contact with the nozzle. The temperature sensor at the pipe outlet needs to be resistant to low temperature and high pressure, the working range is between -100°C and 50°C, and it can withstand a pressure of 20MPa. At the same time, due to the small size of the throat, a small screw head sensor is used to measure the throat temperature. Threaded installation, the length of the probe protruding from the pipeline is slightly different due to the different diameters of the throat, which further improves the stability of the experiment process of the present invention and improves the accuracy of the experiment.

Furthermore, valves, flow meters, temperature sensors and pressure sensors are all connected to the PLC controller, and the experimental data collected by the instruments and meters are sent to the PLC controller, and the PLC controller uses temperature, flow, pressure, and throat speed to calculate and obtain super The various experimental parameters of the sonic gas-liquid separator reduce the influence of human error, realize remote automatic control at the same time, and improve the safety of the present invention.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Among them, 1-water storage tank, 2-water pump, 3-valve, 4-orifice flowmeter, 5-atomizing nozzle, 6-buffer, 7-precession vortex flowmeter, 8-supersonic gas-liquid separator , 9-dry gas storage tank, 10-venting port, 11-water collection tank, 12-drain outlet, 13-compressed air flow meter, 14-air storage tank, 15-air compressor.

detailed description

The present invention will be further explained below in combination with specific embodiments and accompanying drawings.

Referring to Fig. 1, the present invention comprises the atomizing device that is connected with the gas-liquid inlet of supersonic gas-liquid separator 8, and atomizing device comprises the liquid circuit that is used to produce atomized liquid and the gas circuit that is used to produce high-pressure gas, liquid circuit and the gas path are all connected to the buffer 6, the gas-liquid outlet of the buffer 6 is connected to the gas-liquid inlet of the supersonic gas-liquid separator 8; the liquid path includes a water storage tank 1, a water pump 2 and an atomizing nozzle 5 connected in sequence, The nozzle 5 is set on the liquid inlet of the buffer 6, the temperature sensor and the pressure sensor are set at the outlet of the water pump 2, the flow meter is set at the entrance of the atomizing nozzle 5, a valve 3 is set between the flow meter and the water pump 2, and the atomizing nozzle 5 The flowmeters of the inlet and the liquid outlet of the supersonic gas-liquid separator 8 all adopt orifice flowmeters 4; At the outlet, a valve 3 is arranged between the gas inlet of the buffer 6 and the outlet of the gas storage tank 14 , and the flow meter of the gas inlet of the buffer 6 is a compressed air flow meter 13 .

The supersonic gas-liquid separator 8 comprises a nozzle with a throat, and a diffuser pipe, and the liquid outlet of the supersonic gas-liquid separator 8 is connected with a liquid collection device, and the liquid collection device is a water collection tank 11, and the water collection tank 11 There is a drain port 12 at the bottom, and the gas outlet of the supersonic gas-liquid separator 8 is connected with a gas collecting device, the gas collecting device is a dry gas storage tank 9, and an opening 10 is opened on the dry gas storage tank 9; the outlet of the liquid circuit, the gas Temperature sensors and pressure sensors are all arranged on the outlet of the road, the outlet of the nozzle, the inlet of the diffuser, the liquid outlet of the supersonic gas-liquid separator 8, and the gas outlet of the supersonic gas-liquid separator 8. The throat of the gas-liquid separator 8 is provided with a temperature sensor, the liquid inlet of the buffer 6, the gas inlet of the buffer 6, the gas-liquid inlet of the supersonic gas-liquid separator 8 and the liquid outlet of the supersonic gas-liquid separator 8. A flow meter is provided, and the outlet of the liquid path, the outlet of the gas path, the gas-liquid inlet of the supersonic gas-liquid separator 8, the liquid outlet of the supersonic gas-liquid separator 8, and the gas outlet of the supersonic gas-liquid separator 8 are all set With valve 3.

The flowmeter of the gas-liquid inlet of the supersonic gas-liquid separator 8 adopts the precession vortex flowmeter 7, and the precession vortex flowmeter 7 is set at the front end of the gas-liquid inlet of the supersonic gas-liquid separator 8, which is 5 times the diameter of the pipeline. The temperature sensor at the throat and the outlet of the nozzle adopts a temperature sensor that can withstand low temperature and high pressure. The working temperature is -100 ° C ~ 50 ° C, and the pressure is 20 MPa. The temperature sensor at the throat uses a screw head sensor. All valves, flow meters, temperature sensors and pressure sensors are connected to a PLC controller.

The present invention is divided into an atomizing device, a separating device, a measuring device and a collecting device according to functions. The atomizing device includes an air compressor 15, a water pump 2, a buffer 6, a pressure stabilizing valve, a water storage tank 1, and an atomizing nozzle 5, etc. And set the measuring instrument at the pipeline position. The separation device mainly refers to the supersonic separator 8, and the separation device includes pipeline accessories such as pipelines, valves, and variable diameters. Measuring devices mainly refer to pressure and temperature sensors and transmitters preset in various places, as well as PLC single-chip microcomputers and computers for recording and displaying. The collection device mainly includes a dry gas storage tank 9, a water collection tank 11 and corresponding pipeline accessories.

Installation and debugging process of the present invention:

(1) Equipment installation: In the selected test site, according to the order from primary to secondary, install the separator prototype from the middle position, discharge the position of the atomization device in sequence at the inlet end, and install the gas collecting equipment and The location of the liquid collection equipment is arranged. According to the adjustable size of the separator combination, enough space is reserved. The separator model with intermediate parameters is selected to assemble and fix each device. The measuring instruments are finally installed in the preset position. When installing the equipment, it is necessary to consider mutual On the basis of ensuring non-interference, try to make the installation location as compact as possible, the arrangement of water pump 2 and air compressor 15 should be staggered as much as possible, and pay attention to the influence of equipment vibration on the experiment;

(2) Measuring instrument verification: Connect each measuring instrument to the system according to the instructions, initialize, verify the working status, check whether the range and accuracy meet the requirements, and ensure that the signal measurement and transmission are normal;

(3) Air-tightness inspection: Before the experiment starts, an air-tightness inspection is required. After each device is installed in place, low-pressure air is introduced to check whether the connecting parts of the separator are tight without leakage, and whether the measuring instrument is installed tightly. Firm, check whether the pipeline joint is sealed in place;

(4) Environmental humidity measurement and influence elimination: a hygrometer is installed on the experimental site to measure the environmental humidity for reference. At the same time, in order to ensure accurate measurement of the separation efficiency, openable and closed dryers are respectively installed at the outlet of the collection device. The dryer mainly The method of physical adsorption was used to eliminate the influence of environmental humidity on the experiment. It needs to be closed during the formal experiment;

(5) Start and stop of the device: In consideration of the safety of the air pressure experiment, except for the air compressor 15 and the water pump 2, the opening and closing of other devices in the experiment are all operated remotely by a single-chip microcomputer or computer. When the experiment is over, the water pump 2 is turned off first. And valve, air compressor 15 continues to work, utilizes air pressure to discharge the wet air in the system.

The experimental parameters of the present invention are divided into operating parameters and performance parameters. The operating parameters are used to set different working conditions. The main operating parameters include liquid concentration C _i and pressure ratio P _r . Performance parameters are used to characterize the performance of the separator. The main performance parameters are separation efficiency E _t and temperature drop ΔT. The calculation method of each parameter is as follows:

(1) Inlet liquid concentration C _i

The inlet liquid concentration is mainly used to simulate the water content of natural gas, and the water content of natural gas varies with different production regions. The C _i value has a very direct impact on the separation efficiency of the separator. During the experiment, it is necessary to pre-set the inlet liquid concentration C _i0 , and the preset inlet liquid concentration is calculated by the following formula:

${\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; G</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

In the formula, G ₁ -liquid mass flow rate, kg/s; G ₂ -gas mass flow rate, kg/s.

Considering that it is difficult to adjust the gas flow rate, the gas mass flow rate G2 is kept constant during preset, and the predetermined liquid concentration is achieved by adjusting _G1 . _A temperature and humidity sensor is installed at the outlet end of the buffer 6 to measure the inlet of the separator. Terminal fluid humidity, if the error between the measured value C _i and the set value C _i0 is within 0.5%, it is considered qualified.

(2) Pressure ratio P _r

The pressure ratio refers to the ratio of the supersonic separator inlet pressure P _in to the dry gas outlet pressure P _out .

${\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; P</span>}}_{\mathrm{<span\; class="notranslate">\; o</span>}\mathrm{<span\; class="notranslate">\; u</span>}\mathrm{<span\; class="notranslate">\; t</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In the formula, P _r - pressure ratio; P _in - inlet pressure PinG ₂ gas mass flow rate, MPa; P _out - outlet pressure, MPa.

According to the existing theory, the pressure ratio has a very important influence on the flow state of the gas flow in the separator. When the pressure ratio is too large, the fluid velocity in the separator is too high, the gas flow uniformity is insufficient, and the subsequent swirl flow cannot be guaranteed effectively. Other processes are carried out smoothly. When the pressure is relatively small, the energy of the gas flowing through the nozzle is limited, and the effective realization of supersonic flow cannot be guaranteed. The gas velocity at the outlet of the nozzle is small, and sufficient swirl strength cannot be generated when flowing through the separation wing, and the gas-liquid separation is not complete. . Within the range allowed by the process, try to choose a small pressure ratio for the experiment.

(3) Separation efficiency E _t

Separation efficiency is a key indicator to characterize the performance of supersonic separators. Separation efficiency refers to the efficiency of the separator in treating wet gas. It is characterized by measuring the change of liquid mass. It is measured and calculated by the following formula:

${\mathrm{<span\; class="notranslate">\; E.</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; m</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{{\mathrm{<span\; class="notranslate">\; C</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; G</span>}}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 100</span>}\mathrm{<span\; class="notranslate">\; \%</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

In the formula, G-wet air mass flow rate, kg/s; m ₂ -outlet liquid mass, kg obtained by measuring the liquid mass at the discharge port.

(4) Temperature drop ΔT

The temperature drop is another important index to characterize the performance of the separator. The temperature drop refers to the difference between the separator inlet temperature T _in and the nozzle outlet temperature T _min (the lowest temperature value).

ΔT＝T _in -T _min (4)

The larger the ΔT value, the lower the minimum temperature that the separator can reach, and the stronger the low-temperature driving force that can be generated. The temperature drop ΔT can be directly displayed after reading the value of the temperature sensor at the predetermined position and calculating it through the single-chip microcomputer.

The physical quantities to be measured in the experiment of the present invention are: temperature T, flow rate Q, pressure P and throat velocity v. The data reading and recording of all instruments and meters in the experiment are completed by single-chip microcomputer or computer software to reduce the influence of human error.

In the atomization device, pressure, temperature, and flow measuring devices are installed in the gas path and liquid path respectively, mainly for the adjustment of inlet parameters. Considering the limited capacity of the single-chip microcomputer, this part of the equipment is not connected to the single-chip microcomputer, and the traditional instrument is used to measure and display , make manual records before the start of the experiment, and only need to ensure that its parameters remain stable during the experiment.

Flow measurement: The flow Q includes the wet air flow at the inlet of the supersonic separator and the liquid flow at the outlet.

(1) Inlet wet air flow The inlet wet air flow is measured by a high-pressure natural gas flowmeter, which belongs to the intelligent precession vortex flowmeter and is mainly measured by the Karman vortex street principle. In order to reduce the impact of the measuring instrument, the installation position of the instrument is recommended by the manufacturer, and the length from the front end of the separator inlet must be guaranteed to be 5 times the length of the pipe diameter as a buffer.

(2) Outlet liquid flow The outlet liquid measurement adopts mass conversion. By installing a liquid collection device at the outlet, weighing the collected liquid mass m (kg) after the experiment is completed, and recording the time t (s) used in the experiment, the outlet liquid flow rate can be measured. Weigh in different ways according to the quality of the outlet liquid. When the quality of the outlet liquid is small, use desiccant to absorb, and measure the outlet liquid flow according to the quality of the desiccant; The desiccant dries the liquid collection device, and the mass of the two is superimposed for calculation.

Temperature measurement:

The temperature T is measured by a temperature sensor. Temperature sensors are installed at the throat of the supersonic separator, the outlet of the nozzle, the inlet of the diffuser, and the outlet of gas and liquid. The measurement data is recorded and displayed by a single-chip microcomputer. The temperature sensor at the throat of the nozzle and the outlet of the nozzle needs to be resistant to low temperature and high pressure, the working range is between -100°C and 50°C, and it can withstand the pressure of 20MPa.

Due to the small size of the throat, a smaller screw head sensor was chosen for throat temperature measurement. Threaded installation, the length of the probe sticking out of the pipe varies slightly due to different throat diameters.

Except for the throat and the outlet of the nozzle, the size of other parts is relatively large, and the temperature requirement is not high. Therefore, the selection of the sensor is relatively easy, and the general temperature sensor can be competent. Just pay attention to the matching of sensor signal transmission and microcontroller.

Pressure measurement:

The pressure P is measured using a pressure sensor, and pressure sensors are respectively installed at the outlet of the nozzle, the inlet of the diffuser, the gas phase outlet, and the liquid phase outlet of the separator. The measurement results of the pressure sensor are displayed and recorded through the single-chip microcomputer. The accuracy of the pressure sensor is required to be within 0.5%, and the range is 0-25Pa. Due to the low temperature of the nozzle outlet, attention should be paid to the low temperature resistance of the pressure sensor.

Throat Velocity Calculation:

Whether the throat can reach the speed of sound is the key to achieve separation, so the measurement of the throat velocity is very important. The size of the throat is small and the pressure is high. When measuring the velocity directly, the existing instruments are difficult to meet the requirements. The velocity value of the throat needs to be converted through other measured values.

The low temperature performance of supersonic separator has important reference value. Therefore, a temperature sensor is installed in the throat for measurement, and the temperature measurement value of the throat is recorded as T _* , and the fluid is regarded as an ideal fluid. According to the aerodynamic relationship, the velocity value v of the throat can be converted.

$\mathrm{<span\; class="notranslate">\; v</span>}<span\; class="notranslate">\; =</span>\sqrt{{\mathrm{<span\; class="notranslate">\; k</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}{\mathrm{<span\; class="notranslate">\; T</span>}}_{<span\; class="notranslate">\; *</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

In the formula, k-diabatic index, air takes 1.4; R _g -gas constant, air takes 287J/(kg·K); T _* -throat temperature measured value K.

In the experiment of the present invention, the supersonic gas-liquid separator prototype is taken as the experimental object, and the separator is composed of Laval nozzle, swirl tube, separation wing, diffuser tube and other components. The Laval nozzle has multiple structures, the position of the separation wing can be adjusted, the length of the diffuser can be adjusted, and the combination of different adjustable structures can form a variety of structures. The focus is on the influence of the adjustable structure on the flow field.

The initial conditions of the experiment: choose to use compressed humid air as the experimental material, set the inlet and outlet temperature, pressure and flow rate. Compressed moist air is regarded as an ideal gas, the mass force is ignored and the heat transfer effect of the gas is ignored.

The purpose of the experiment: (1) To verify the existing design theory through the simulation experiment of supersonic gas-liquid separator; (2) To study the influence of structural parameters on the flow field, and to study the distribution law of the internal flow field; (3) To study the influence of The main factors, structural factors and flow field characteristics of the separation efficiency of the separator; (4) Determine the optimal combination structure, find the structure with the best separation efficiency and small pressure loss among various combination changes, and summarize the design theory of the separator; (5) Study the method of adjusting parameters in the experiment. Such as controlling the position of the shock wave, the method of achieving the extreme low temperature, the method of reducing the pressure drop, etc.

Experimental principle: the main purpose is to convert the pressure energy of the gas into velocity in the Laval nozzle, and at the same time reduce the temperature. During the process of temperature reduction, the components with high dew point gradually condense, accumulate and separate on the wall after the swirl, and process After passing through the diffuser, the velocity of the dried gas decreases and the pressure rises, which is convenient for subsequent treatment and pipeline transportation.

Experimental research content: (1) The effect of structural components such as Laval nozzle, separation wing, and diffuser on the separation efficiency; (2) The effect of fluid states such as outlet velocity, air temperature, and air pressure on the separation efficiency; (3) The inlet contains (4) The influence of flow rate, pressure drop, temperature drop, etc. on the separation efficiency (total efficiency E _t ).

The experimental method is mainly carried out by the comparison method, that is, under the premise that the inlet parameters of the supersonic separator (inlet flow rate, inlet liquid concentration) remain unchanged, the structure of the intermediate parameters is selected as the benchmark, and one structural parameter is changed for each experiment, and other variables are maintained. experiment unchanged. At least three experiments were carried out for each structure, and the average value was taken as the final value.

According to the setting, there are 3 changes in the inlet angle (γ, θ, ω), and each change of angle corresponds to 3 different throat diameters (s, m, l). At the same time, there are 3 positions for the separation wing , there are three kinds of changes in the length of the diffuser section, according to the above analysis, theoretically speaking, the designed supersonic separator can produce 81 kinds of structural changes.

When analyzing the experimental results, in addition to measuring and calculating each key parameter, the results of multiple experiments should also be comprehensively analyzed, and the influence of the changing trend of each parameter on the separation performance should be summarized. The data predicts the adjustment trend of each parameter, and the experiment may not be carried out for structures that obviously do not meet the requirements. The best structure was selected after many experiments, and the selected best structure was used for later on-site experiments.

Concrete experimental process of the present invention:

(1) Calibration of instruments and meters: According to the settings of the instruments, verify the working status of each instrument and sensor, and correct the readings of the instruments and meters;

(2) Adjust the parameters of the separator: set the parameters such as the structure of the nozzle, the position of the separation wing, and the length of the diffuser in the middle position;

(3) set the wet air humidity for the experiment: set the humidity of the air, and calculate the required valve opening according to the flow rate of the air compressor 15 and the water pump 2;

(4) Wet air atomization and pressure maintenance: open the atomization device, inject high-pressure wet air into the buffer 6, and maintain sufficient pressure in the buffer 6;

(5) Gas-liquid separation: when each instrument and equipment work stably, open the valve at the inlet end of the separator through the single-chip microcomputer, and the single-chip microcomputer automatically records the parameters of each instrument and records the experiment time;

(6) Data processing and analysis; under the same working conditions, carry out at least three experiments, and the duration of each experiment should not be less than 5 minutes. Analyze and compare the data of multiple experiments to confirm whether the throat reaches the speed of sound, and analyze temperature changes and pressure drops. Data, according to the experimental data, adjust the change trend of the separator parameters;

(7) Structural adjustment: adjust the separator according to the predicted trend, and repeat steps (2) to (6) under the same working conditions.

Experimental data processing method:

The temperature, pressure and flow data can be obtained every time an experiment is carried out. The recording of these data is completed by a single-chip microcomputer, and the processing of the experimental data needs to be carried out with the help of a computer. A database is established for the measurement results and an intuitive line graph is drawn to eliminate rough error data. Cross-contrast the data at the same position of different structures, predict the next parameter adjustment trend, and analyze it in combination with the results of software simulation.

The low-temperature refrigeration effect of the separator is the key point in the experiment. The software simulation results show that the lowest temperature occurs at the outlet of the nozzle. In order to verify whether the conclusion is correct, when processing the temperature data, the temperature of a single experiment is drawn along the axis Position distribution curves, and then superimposed the distribution curves of multiple experiments for analysis and verification.

The obtaining of the low temperature environment of the separator is related to the pressure loss, the greater the pressure loss, the lower the temperature. In order to verify this conclusion, the temperature curve and pressure curve of each experiment were fitted and compared.

On the basis of verifying the relevant conclusions, the data of multiple experiments are integrated, and the structural parameters that affect temperature, pressure, and velocity are analyzed separately, and the ways to control the changes of these parameters are explored.

The purpose of the research on the supersonic gas-liquid separator test system is to set up a test platform through which the indoor experiment of the supersonic separator can be carried out. Through the experiment, the problems to be solved and the expected experimental results are as follows:

(1) Through multiple experiments, combined with the results of computer software analysis, to find the structure with the best separation efficiency among the 81 structural changes, which is the fundamental purpose of this experiment.

(2) To verify the accuracy of relevant theories, to prove the feasibility of supersonic separation technology and the practicability of the designed structure.

(3) By recording the flow field parameters such as pressure and temperature at different positions in the experiment, the internal flow law of the separator is studied. The air flow inside the separator is a multi-component, compressible, supersonic flow with phase change. Its flow law integrates the theories of thermodynamics, aerodynamics, fluid mechanics and other disciplines, and has a certain influence on the flow law of the internal flow field. Deeper knowledge and research.

(4) The necessary condition for the supersonic separator to maintain good separation efficiency is that the inlet air flow must have a certain pressure, and the pressure value is usually high, the pressure rise at the outlet is limited, and the pressure loss in the entire separation process is large. One of the important aspects to be solved in the experiment is how to obtain higher dehydration efficiency with lower initial energy (such as lower inlet pressure) and less energy loss.

(5) Grasp the role of the low-temperature refrigeration effect of the supersonic separator, by reducing the gas temperature, the gas-liquid separation occurs under the combined action of the low-temperature environment, swirling flow and gravity. Analyze the change of gas flow rate, such as the necessary conditions to reach the supersonic state, and solve the problem of how to reduce the temperature of the gas to the greatest extent.

(6) How to use this device to replace or cooperate with the existing dehydration device, especially to formulate a plan that can be directly applied to the actual process without major changes to the original dehydration process device.

(7) In the supersonic separator, the gas flow rate is very high, and small changes in the structure of the separator will have a great impact on the overall working effect. Carry out all-round and meticulous research on the structural parameters of the separator to find the best or most reasonable Structural model, accumulating and summarizing the design experience and theory of supersonic separator.

(8) Under the premise of a certain processing capacity, reduce the overall volume. When it is unfavorable to use alone, it can be used in conjunction with existing devices (heat exchangers, boosters, expansion agents, etc.) to reduce the amount of subsequent treatment or improve the treatment effect.

(9) Combined with the experimental results, further theoretical research can solve the existing theoretical problems. Through experiments, the theoretical calculations and computer-aided design are compared and verified, and various methods such as numerical analysis are used to continuously correct various parameters of theoretical calculations. , a mathematical model closer to the real gas is obtained, which lays a theoretical foundation for further in-depth research on the gas-liquid separation device.

Claims (10)

1. a supersonic gas-liquid separator test and experimental system, is characterized in that, comprises the atomizing device that is connected with the gas-liquid inlet of supersonic gas-liquid separator (8), and atomizing device comprises for producing atomized liquid The liquid path and the gas path used to generate high-pressure gas, the liquid path and the gas path are connected to the buffer (6), the gas-liquid outlet of the buffer (6) is connected to the gas-liquid of the supersonic gas-liquid separator (8) Inlet; the supersonic gas-liquid separator (8) includes a nozzle with a throat, and a diffuser pipe, the liquid outlet of the supersonic gas-liquid separator (8) is connected with a liquid collection device, and the supersonic gas The gas outlet of the liquid separator (8) is connected with a gas collecting device; the outlet of the liquid path, the outlet of the gas path, the outlet of the spray pipe, the inlet of the diffuser tube, and the liquid outlet of the supersonic gas-liquid separator (8) 1. The gas outlet of the supersonic gas-liquid separator (8) is provided with a temperature sensor and a pressure sensor, and the throat of the supersonic gas-liquid separator (8) is provided with a temperature sensor, and the buffer (6) The liquid inlet, the gas inlet of the buffer (6), the gas-liquid inlet of the supersonic gas-liquid separator (8) and the liquid outlet of the supersonic gas-liquid separator (8) are all provided with flow meters, and the outlet of the liquid circuit , the outlet of the gas circuit, the gas-liquid inlet of the supersonic gas-liquid separator (8), the liquid outlet of the supersonic gas-liquid separator (8) and the gas outlet of the supersonic gas-liquid separator (8) are all provided with valves ( 3). 2. a kind of supersonic gas-liquid separator test and experimental system according to claim 1, is characterized in that, described liquid path comprises water storage tank (1), water pump (2) and atomizing nozzle ( 5), the atomizing nozzle (5) is arranged on the liquid inlet of the buffer (6), the temperature sensor and the pressure sensor are arranged at the outlet of the water pump (2), the flowmeter is arranged at the inlet of the atomizing nozzle (5), and the flowmeter A valve (3) is set between the water pump (2). 3. a kind of supersonic gas-liquid separator test and experimental system according to claim 2, is characterized in that, the flow meter of described atomization nozzle (5) inlet and supersonic gas-liquid separator (8) liquid outlet Orifice flowmeters (4) are used. 4. a kind of supersonic gas-liquid separator test and experimental system according to claim 3, is characterized in that, described gas path comprises the air compressor (15) that connects successively and gas storage tank (14), temperature sensor and the pressure sensor are arranged at the outlet of the gas storage tank (14), and a valve (3) is arranged between the gas inlet of the buffer (6) and the outlet of the gas storage tank (14). 5. A kind of supersonic gas-liquid separator test and experiment system according to claim 4, is characterized in that, the flowmeter of the gas inlet of the buffer (6) is a compressed air flowmeter (13). 6. a kind of supersonic gas-liquid separator test and experimental system according to claim 1, is characterized in that, the flowmeter of described supersonic gas-liquid separator (8) gas-liquid inlet adopts precession vortex flowmeter ( 7). 7. A kind of supersonic gas-liquid separator test and experiment system according to claim 6, is characterized in that, described precession vortex flowmeter (7) is arranged on supersonic gas-liquid separator (8) gas-liquid inlet The front end is 5 times the diameter of the pipe. 8. A kind of supersonic gas-liquid separator test and experimental system according to claim 1, is characterized in that, the temperature sensor of described throat and nozzle outlet adopts the temperature sensor that can withstand low temperature and high pressure, and operating temperature is- 100 ℃ ~ 50 ℃, withstand the pressure of 20MPa. 9. A supersonic gas-liquid separator test and experiment system according to claim 8, characterized in that the temperature sensor at the throat is a screw head sensor. 10. A kind of supersonic gas-liquid separator test and experiment system according to claim 1, is characterized in that, described valve, flow meter, temperature sensor and pressure sensor are all connected to PLC controller.