CN213956538U

CN213956538U - Positive pressure high-temperature gas standard device with sonic nozzle as standard device

Info

Publication number: CN213956538U
Application number: CN202120104276.XU
Authority: CN
Inventors: 管洪辉; 毕晓龙; 沈理
Original assignee: Dandong Best Automatic Engineering&meter Ltd
Current assignee: Dandong Best Automatic Engineering&meter Ltd
Priority date: 2021-01-15
Filing date: 2021-01-15
Publication date: 2021-08-13
Anticipated expiration: 2031-01-15

Abstract

The utility model discloses an use malleation high temperature gas standard device of sonic nozzle as etalon, include: the device comprises an air compressor, a steady flow container, a standard device unit, a gas heating unit and a detected meter unit; the standard unit consists of a stagnation container and a plurality of sonic nozzles; the outlet end of the air compressor is connected with the inlet end of the steady flow container, the outlet end of the steady flow container is connected with the inlet end of the stagnation container, the verification medium enters the stagnation container, flows out of the stagnation container through the plurality of sonic nozzles and then enters the gas heating unit through the collecting pipe, and the verification medium flows through the tested surface unit after being heated and then enters the air cooling unit through the pipeline; the temperature and pressure acquisition unit acquires the temperature and pressure values of the standard unit and the detected meter unit. The positive pressure high-temperature gas standard device can calibrate the gas flowmeter under the high-temperature working condition, and collects corresponding temperature, pressure value and signals of the detected meter through the upper computer control, so as to judge the difference value between the detected meter and the standard device, and calculate the error result.

Description

Positive pressure high-temperature gas standard device with sonic nozzle as standard device

Technical Field

The utility model relates to a malleation high-temperature gas standard device relates to an use malleation high-temperature gas standard device of sonic nozzle as etalon.

Background

With the rapid advance of the industry in China, the gas flowmeter is widely applied to key occasions such as chemical engineering, smelting, trade handover and the like, wherein the demand of the high-temperature gas flowmeter is increased in recent years and is widely applied to industries such as smelting, chemical engineering, heat transmission and the like, however, how to calibrate or calibrate the flowmeter becomes a difficult problem in the metering industry.

The currently used method is to calibrate the high-temperature flow meter on a normal-temperature device, for example, a differential pressure flow meter and a vortex shedding flow meter, and the calibrated data under the normal-temperature working condition cannot completely reflect the precision of the working condition scene of the flow meter in actual use, which brings a difficult problem for many users and producers of high-temperature gas flow meters. In order to solve the difficult problem of calibrating the flow of the high-temperature gas, a positive-pressure high-temperature gas standard device is inevitably developed.

SUMMERY OF THE UTILITY MODEL

Problem to high temperature gas flowmeter can not mark under the high temperature operating mode, the problem that can not truly reflect high temperature gas flowmeter's performance is markd to the normal atmospheric temperature, the utility model provides an use malleation high temperature gas standard device of sonic nozzle as the etalon.

The utility model provides an use malleation high temperature gas standard device of sonic nozzle as etalon, include: the device comprises an air compressor, a steady flow container, a standard device unit, a gas heating unit, a detected meter unit, an air cooling unit and a temperature and pressure acquisition unit; the etalon unit consists of a stagnation container and a plurality of sonic nozzles; the outlet end of the air compressor is connected with the inlet end of the steady flow container through a pipeline, the outlet end of the steady flow container is connected with the inlet end of the stagnation container through a pipeline, the verification medium enters the stagnation container, flows out of the stagnation container through the plurality of sonic nozzles and then enters the gas heating unit through the collecting pipe, and the verification medium is heated, flows through the detected unit and then enters the air cooling unit through a pipeline; the temperature and pressure acquisition unit comprises a temperature transmitter, a pressure transmitter and a mechanical pressure gauge so as to acquire the temperature and pressure values of the standard device unit and the detected gauge unit.

The utility model discloses an use among the malleation high temperature gas standard device of sonic nozzle as the etalon, the stationary flow container comprises gas holder and stationary flow jar, the exit end of pipe connection air compressor is passed through to the entry end of gas holder, and the exit end of gas holder passes through the pipeline and is connected to the stationary flow jar through the desicator, and the entry end and the exit end of desicator are equipped with the filter respectively, are equipped with first air-vent valve at the entry end of stationary flow jar.

The utility model discloses an use among the malleation high temperature gas standard device of sonic nozzle as the etalon, gaseous heating unit includes heater, temperature acquisition part and PID controller, and the temperature that the temperature acquisition part gathered in the heater furnace is sent the PID controller, carries out PID to the heater through the PID controller and adjusts the constant temperature that realizes examining and determine the medium.

The utility model discloses an use among the malleation high temperature gas standard device of sonic nozzle as the etalon, examined the table unit and include: the high-temperature meter clamping device comprises a high-temperature meter clamping device and a flowmeter, wherein the flowmeter is clamped and fixed through the high-temperature meter clamping device, and a heat preservation layer is arranged outside the checked meter unit.

The utility model discloses an use among the malleation high temperature gas standard device of sonic nozzle as the etalon, temperature transmitter and pressure transmitter are from taking 4-20mA output signal, convert 4-20mA signal into RS232 signal through analog quantity collection module and give the host computer calculation and obtain temperature, pressure value to participate in the calculation of examination.

The utility model discloses an use malleation high temperature gas standard device of sonic nozzle as etalon has following beneficial effect at least:

1. the utility model discloses chooseed for use gas flow standard device widely used etalon sonic nozzle, the sonic nozzle is reaching the sonic flow after, and the flow of the nozzle that flows through is invariable. The device is designed to work under the normal temperature state at the nozzle, the influence of high temperature on the sonic nozzle is avoided, the working condition of the normal temperature also facilitates the tracing of the sonic nozzle, and the use and calibration of the device are facilitated.

2. The utility model discloses only design as high-temperature region, temperature range 0-200 ℃ in the regional design in examined table unit place. The high-temperature meter clamping device is adopted to clamp the checked meter, the heat preservation layer is designed in the area, the temperature change of the front and rear straight pipe sections of the checked meter is prevented, the influence of large temperature difference on the verification of the flow meter is avoided, and the design of the area completely meets the condition of the working condition use of the high-temperature gas flow meter. The influence of calibration on the high-temperature flowmeter under the normal-temperature working condition is solved.

3. The utility model discloses choose an air compressor for use as the air supply, air compressor can select according to high temperature gas device's maximum flow, can satisfy the requirement of high temperature gas flow standard device to total tolerance. Meanwhile, besides the air compressor, a freezing dryer and a filter are also arranged in a standard mode, so that the gas entering the high-temperature gas flow standard device is dry and clean, and the density of a detected medium is not affected.

4. The utility model discloses selected for use doublestage steady voltage structure. The high-temperature gas flow standard device is divided into a gas storage tank and a flow stabilizing tank, and the gas storage tank and the flow stabilizing tank can be designed according to the maximum flow of the high-temperature gas flow standard device. When the air of the air compressor enters the storage tank, the pressure of the air storage tank can be increased and stabilized at a stable value, and the pressure regulating valve at the front end of the flow stabilizing tank is opened to regulate the pressure of the air entering the flow stabilizing tank. Thereby realizing the adjustment of the pressure of the gas entering the front end of the sonic nozzle. The design can meet the working pressure value of the front end when the sonic nozzle reaches sonic flow. And the pressure can be adjusted according to the working condition pressure requirement of the detected meter.

5. The utility model discloses a heating part design is in etalon unit rear end and is examined table unit front end, only is being examined the table region and heats to the heater has PID regulatory function, after setting for the required temperature of examination, need not to carry out the manual operation again, and the gas temperature that the heating controller can be based on in the furnace temperature and the temperature automatically regulated pipeline of heater export reaches the setting value, satisfies high temperature gas flowmeter's examination requirement.

6. The utility model discloses except the front end air-vent valve, still establish an air-vent valve in the quilt examine table rear end, adjust according to the pressure demand of examining the flowmeter, this valve and front end air-vent valve cooperate and adjust, make the velocity of sound nozzle front and back end pressure differential reach and are pressed than the requirement to make the gas of the velocity of sound nozzle of flowing through reach the velocity of sound and flow, satisfy the service condition of velocity of sound nozzle. The design not only meets the use condition of the sonic nozzle, but also can meet the working pressure requirement of the detected flowmeter.

7. The utility model designs a complete temperature pressure acquisition system of one set, set up temperature pressure acquisition part respectively at gas holder, stationary flow jar, stagnation container and examined the table front and back end. The temperature and pressure change of each part unit can be monitored in real time, and the temperature and pressure at the front end and the rear end of the to-be-detected meter and the temperature and pressure at the front end and the rear end of the sonic nozzle can be collected in real time through the control of the upper computer to be calculated. The accuracy of the temperature transmitter is 0.2 ℃, and the accuracy of the pressure transmitter is 0.075%.

8. The utility model discloses in order to avoid producing the pollution to the atmosphere, install cooling device additional at the gas vent front end of device. The cooling device can cool the high-temperature gas to below 40 ℃ before the high-temperature gas is discharged out of the atmosphere. Ensuring that the exhausted gas does not pollute the atmosphere. The cooling device can be designed and installed according to high-temperature gas quantity standard devices with different flow rates. The device can not pollute and influence the environment in the use process.

Drawings

Fig. 1 is a schematic structural diagram of a positive pressure high temperature gas standard device using a sonic nozzle as a standard device according to the present invention.

The device comprises an air compressor, an air cooling unit, a flow stabilizing tank, a gas storage pipe, a first pressure regulating valve, a first filter, a second filter, a dryer, a second regulating valve, a meter detecting unit, a heater, a stagnation container, a collecting pipe, a first temperature and pressure collecting unit, a second temperature and pressure collecting unit, a third temperature and pressure collecting unit, a cold air pipeline and a sonic nozzle, wherein the air compressor is 1-the air compressor, the air cooling unit is 2-the air cooling unit, the flow stabilizing tank is 3 a-the gas storage pipe, the first pressure regulating valve is 4-the first pressure regulating valve, the first filter is 5 b-the second filter, the dryer is 6-the second regulating valve is 7-the second regulating valve is 8-the detected meter unit, the heater is 9-the stagnation container is 10-the collecting pipe, the collecting pipe is 12 a-the first temperature and pressure collecting unit, the second temperature and pressure collecting unit is 12 b-the third temperature and pressure collecting unit, the cold air pipeline is 13-the sonic nozzle.

Detailed Description

As shown in fig. 1, the utility model discloses an use malleation high temperature gas standard device of sonic nozzle as etalon, include: the device comprises an air compressor 1, a steady flow container, a standard device unit, a gas heating unit, a detected meter unit 8, an air cooling unit 2 and a temperature and pressure acquisition unit. The outlet end of the air compressor 1 is connected with the inlet end of the steady flow container through a pipeline, and the outlet end of the steady flow container is connected with the inlet end of the standard unit through a pipeline. The standard unit consists of a stagnation container 10 and a plurality of sonic nozzles 14, and the upper ends of the sonic nozzles 14 are provided with electric switch valves to select the states of the nozzles through upper computer control, so that the function of selecting flow is achieved. The upper end of the stagnation container 10 is provided with a collecting pipe 11, and pressure difference is generated to enable the sonic nozzle to reach a working state. After entering the stagnation container 10, the verification medium flows out through the plurality of sonic nozzles 14 and then enters the gas heating unit through the collecting pipe 11, and after being heated, the verification medium flows through the detected surface unit 8 and then enters the air cooling unit 2 through the pipeline. The temperature and pressure acquisition unit comprises a temperature transmitter, a pressure transmitter and a mechanical pressure gauge so as to acquire the temperature and pressure values of the standard device unit and the detected gauge unit.

The flow stabilizing container is composed of a gas storage tank 3b and a flow stabilizing tank 3a, the inlet end of the gas storage tank 3b is connected with the outlet end of the air compressor 1 through a stainless steel pipeline, the outlet end of the gas storage tank 3b is connected to the flow stabilizing tank 3a through a dryer 6 through a stainless steel pipeline, a first filter 5a and a second filter 5b are respectively arranged at the inlet end and the outlet end of the dryer 6, and a first pressure regulating valve 4a is arranged at the inlet end of the flow stabilizing tank 3 a. The stainless steel pipeline is provided with a drain valve, a maintenance valve and the like.

The gas heating unit comprises a heater 9, a temperature acquisition component, a PID controller and a temperature display meter. The temperature acquisition component acquires the temperature in the hearth of the heater and sends the temperature to the PID controller, and the PID controller performs PID adjustment on the heater to realize constant temperature of the detection medium. The temperature acquisition component specifically adopts a bimetallic thermometer.

The table unit to be checked includes: the high-temperature meter clamping device comprises a high-temperature meter clamping device and a flowmeter, wherein the flowmeter is clamped and fixed through the high-temperature meter clamping device, and a heat preservation layer is arranged outside the checked meter unit. The rear end of the meter unit to be detected is provided with a second pressure regulating valve 7 for regulating the pressure of the meter unit to be detected according to the requirement of the meter to be detected. The front inlet of the tested meter unit 8 is connected with the gas heating unit through a stainless steel pipeline, and the rear outlet of the tested meter unit is connected with the air cooling unit 2 through a stainless steel pipeline. The cooling design is adopted in the discharging process, the discharged high-temperature gas can be prevented from polluting the atmosphere, the air cooling unit additionally arranged at the front end of the discharging port is designed and installed according to the maximum flow of the device, the temperature of the flowing high-temperature gas discharged to the atmosphere is not higher than 40 ℃, the temperature of the discharged gas is not higher than 30 ℃ in actual inspection, and the requirement of environmental protection is completely met.

During specific implementation, a verification medium is pressurized by the air compressor 1 and then enters the air storage tank 3b, the air storage tank flows through the second filter 5b, the air dryer 6 and the first filter 5a after the pressure is constant, dry and clean air enters the flow stabilization tank 3a after the pressure is adjusted by the first pressure adjusting valve 4a, enters the stagnation container 10 after the flow stabilization, then flows through the standard sonic nozzle 14 at a certain pressure, is heated by the heater 9 when flowing out of the sonic nozzle 14, is heated to 150-200 ℃, flows through the to-be-detected meter unit 8, stabilizes the pressure in the region of the to-be-detected meter unit 8 to the verification requirement by the second pressure adjusting valve 7 at the rear end of the to-be-detected meter unit, then enters the air cooling unit 2, cools the verification medium to below 40 ℃ by the air cooling unit 2, and is discharged to the atmosphere.

The utility model discloses a doublestage stationary flow structure carries out the stationary flow. The air is output by the air compressor 1 and then stored in the air storage tank 3b, and the size of the air storage tank can be designed according to the flow of the device. The pressure of the air tank will stabilize within a range as the air compressor 1 is adjusted. Meanwhile, the temperature of the air can rise due to compression, and after the air storage tank 3b is started and operated for a period of time, the temperature of the air storage tank is constant within a temperature range and cannot fluctuate. When the first pressure regulating valve 4a is opened, the gas will flow into the flow stabilizer 3a through the filter and the dryer, and the size of the flow stabilizer can be designed according to the flow rate of the device. After a period of time operation, the temperature and pressure in the current stabilizer can be constant at a certain value, no too large fluctuation can occur, and after 2-stage voltage stabilization and current stabilization, the air can flow through the sonic nozzle and the detected meter unit at a constant pressure and temperature.

The utility model discloses a malleation high-temperature gas standard device can realize arbitrary pressure regulation under maximum operating pressure. The device selects two electric pressure regulating valves as a pressure regulating mechanism, a first pressure regulating valve is arranged at the rear end of a gas storage tank and can regulate the air inlet pressure at the front end of a sonic nozzle, a second pressure regulating valve is arranged at the rear end of a detected meter unit and can regulate the pressure at the rear end of the sonic nozzle by regulating the second pressure regulating valve, the required pressure ratio of the sonic nozzle can be obtained by regulating the two pressure regulating valves, and the pressure when the detected meter is detected can also be regulated.

The utility model discloses a malleation high-temperature gas standard device designs for the etalon part work under normal atmospheric temperature state, is examined the table unit and is worked under high temperature state. The high-temperature part of the device only heats the region where the meter unit to be detected is located, the gas heating unit is provided with a temperature acquisition component, the temperature in the hearth of the heater and the temperature at the outlet of the heater can be monitored in real time, and the constant temperature of the medium can be detected by utilizing the PID regulation function of the PID controller. The temperature of the outlet of the heater is set as the required medium temperature, the PID controller can adjust the heater body to keep the temperature at the set value, and no manual operation is needed in the verification process. The design avoids the influence of the heating of the standard device unit on the sonic nozzle, all the calculations of the sonic nozzle can be carried out according to the performance under the normal temperature state, and the calibration and the use of the sonic nozzle are convenient. The standard value of the sonic nozzle can be calculated through a state equation of gas to obtain the density of the unit of the detected meter under the working condition, and the accumulated volume flowing through the detected meter in unit time is converted through the mass flow of the sonic nozzle, so that the standard device and the detected meter are compared.

The device adopts a temperature and pressure measuring design of a standard device unit and a tested meter unit respectively. 6 temperature transmitters and 7 pressure transmitters are provided for monitoring the temperature and pressure changes of the stagnation container 10, the gas storage tank 3b, the steady flow tank 3a, the collecting pipe, the gas outlet and the like in real time. The temperature transmitter and the pressure transmitter are provided with 4-20mA output signals, the 4-20mA signals are converted into RS232 signals through the analog quantity acquisition module, the RS232 signals are sent to the upper computer to be calculated to obtain temperature and pressure values, and the acquired temperature and pressure values are involved in calculation of verification. The precision of the selected temperature transmitter is 0.2 ℃, and the precision of the pressure transmitter is 0.075%. Completely meets the requirements of relevant verification. The specific working principle is as follows:

the device completes control by matching the upper computer and the lower computer, comprises action control, temperature and pressure acquisition of the device, and judges the difference between the detected meter and the standard device by the established mathematical model, thereby calculating an error result.

The air compressor 1 is opened to set the working pressure, compressed air is transmitted into the air storage tank, and when the pressure of the air storage tank reaches a set value, the upper computer controls the air compressor to stop working. According to the flow point to be detected, the upper computer selects the number of the sonic nozzles 14, the rear end switch valve of the nozzles is opened, the corresponding sonic nozzles 14 are conducted, the meter to be detected is well installed by a meter clamping device in the area of the meter unit to be detected, and screws are fixed. And opening pneumatic ball valves in front of and behind the meter clamping device to conduct the meter to be detected.

When the pipeline valves of the standard device and the detected meter are opened, the pipeline valves are in a connection state. The first pressure regulating valve 4a can be adjusted by the upper computer. The pressure of the air entering the stagnation vessel 10 is adjusted. And simultaneously, a second pressure regulating valve 7 at the rear end of the meter unit to be detected is regulated to keep the pressure in the meter pipeline to be detected at more than 0.4 MPa. The sonic nozzle 14 of the standard is set to the operating state (the back pressure ratio meets the verification requirement) by adjusting the first pressure regulating valve 4 a. And operating for 5-10 minutes in the state to keep the pressure in the gas storage tank, the flow stabilizing tank, the pipeline and the stagnation container balanced.

After the pressure in the pipeline is kept balanced, the heater 9 can be started to heat the gas entering the meter unit to be detected, and the working temperature is set to be any value between 0 and 200 ℃. And keeping the circulation of air in the pipeline, operating for 15-30 minutes after the outlet temperature of the heater reaches a set value, and performing verification after the temperature of the unit to be detected is constant.

Under the control of the upper computer, the temperature and the pressure in the stagnation container are transmitted to the upper computer through the first temperature and pressure acquisition unit 12 a. The temperature and the pressure of the detected meter area are transmitted to the upper computer in real time through the second temperature and pressure acquisition unit 12b and the third temperature and pressure acquisition unit 12c, the upper computer calculates the mass flow of the sonic nozzle through the outflow coefficient and the throat diameter of the sonic nozzle, and the density of the gas at the detected meter is calculated through the average value of the temperature and the pressure in the detection process and the gas state equation, so that the volume of the standard device at the detected meter in the set time is calculated. And calculating the volume of the gas flowing through the detected meter within a set time through a signal sent by the detected meter, calculating a difference value through comparison, and finally judging a verification result or a calibration result.

After the verification is finished, a valve of the cold air pipeline 13 is opened, unheated normal-temperature air enters the pipeline of the meter to be detected, the meter to be detected is cooled to the normal temperature, and the meter to be detected can be taken down.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the spirit of the present invention, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A positive pressure high temperature gas standard device using a sonic nozzle as a standard device is characterized by comprising: the device comprises an air compressor, a steady flow container, a standard device unit, a gas heating unit, a detected meter unit, an air cooling unit and a temperature and pressure acquisition unit; the etalon unit consists of a stagnation container and a plurality of sonic nozzles; the outlet end of the air compressor is connected with the inlet end of the steady flow container through a pipeline, the outlet end of the steady flow container is connected with the inlet end of the stagnation container through a pipeline, the verification medium enters the stagnation container, flows out of the stagnation container through the plurality of sonic nozzles and then enters the gas heating unit through the collecting pipe, and the verification medium is heated, flows through the detected unit and then enters the air cooling unit through a pipeline; the temperature and pressure acquisition unit comprises a temperature transmitter, a pressure transmitter and a mechanical pressure gauge so as to acquire the temperature and pressure values of the standard device unit and the detected gauge unit.

2. The positive pressure high temperature gas calibration device with a sonic nozzle as the calibrator as claimed in claim 1, wherein the steady flow container is composed of an air storage tank and a steady flow tank, an inlet end of the air storage tank is connected with an outlet end of the air compressor through a pipeline, an outlet end of the air storage tank is connected to the steady flow tank through a dryer through a pipeline, the inlet end and the outlet end of the dryer are respectively provided with a filter, and the inlet end of the steady flow tank is provided with a first pressure regulating valve.

3. The positive-pressure high-temperature gas standard device with the sonic nozzle as the standard device according to claim 1, wherein the gas heating unit comprises a heater, a temperature acquisition component and a PID controller, the temperature acquisition component acquires the temperature in a hearth of the heater and sends the temperature to the PID controller, and the PID controller performs PID adjustment on the heater to realize constant temperature of the verification medium.

4. The positive pressure high temperature gas gauging device with a sonic nozzle as a etalon of claim 1, wherein said gauging unit comprises: the high-temperature meter clamping device comprises a high-temperature meter clamping device and a flowmeter, wherein the flowmeter is clamped and fixed through the high-temperature meter clamping device, and a heat preservation layer is arranged outside the checked meter unit.

5. The positive-pressure high-temperature gas standard device with the sonic nozzle as the standard device as claimed in claim 1, wherein the temperature transmitter and the pressure transmitter are provided with 4-20mA output signals, and the 4-20mA signals are converted into RS232 signals through the analog quantity acquisition module and sent to the upper computer for calculation to obtain temperature and pressure values so as to participate in the calculation of the verification.