CN210268772U - Gas mass flowmeter - Google Patents
Gas mass flowmeter Download PDFInfo
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- CN210268772U CN210268772U CN201921588132.5U CN201921588132U CN210268772U CN 210268772 U CN210268772 U CN 210268772U CN 201921588132 U CN201921588132 U CN 201921588132U CN 210268772 U CN210268772 U CN 210268772U
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Abstract
The utility model provides a gas mass flow meter. The gas mass flow meter comprises a gas working condition volume flow meter, a gas temperature sensor, a gas pressure sensor and a secondary flow calculating instrument, wherein the gas working condition volume flow meter, the gas temperature sensor and the gas pressure sensor are respectively arranged on a pipeline through which gas flows, and the secondary flow calculating instrument is respectively electrically connected with the gas working condition volume flow meter, the gas temperature sensor and the gas pressure sensor. The secondary flow calculating instrument can calculate the mass flow according to the calculating formula according to the measured differential pressure value, temperature value and pressure value.
Description
Technical Field
The utility model relates to a flow measurement technical field, concretely relates to gas mass flow meter.
Background
The chemical reactor (reaction furnace) plays a key role in chemical production. The various materials which are added into the chemical reactor and take part in the reaction need to be accurately metered and controlled according to the principle of the chemical reaction, so that the requirements of chemical product generation and stable quality can be met. The development of the current gas flow meter is rapidly developed, and various gas mass flow meters can meet the requirement of accurate metering of most chemical reaction materials. However, the high price of high precision gas mass flow meters often allows users to adjust and control product quality with frequent product testing and manual operations at the expense of meter accuracy. However, adjusting and controlling the product quality based on the product assay detection data and manual operation causes a delay in the feedback of product quality information, which causes a significant economic loss due to the long-term accumulation of low-quality products resulting from the readjustment delay.
Moreover, the conventional mass flowmeter with the DN300 or more is absent in the prior art, because the larger the pipe diameter is, the more difficult the measurement precision is to ensure.
Disclosure of Invention
To the problem mentioned in the background art, the utility model provides a gas mass flow meter.
The utility model provides a pair of gas mass flow meter for measure gaseous mass flow in the pipeline that the gas flows through, including gaseous operating mode volumetric flowmeter, gas temperature sensor, gas pressure sensor and secondary flow calculation instrument, gaseous operating mode volumetric flowmeter, gas temperature sensor, gas pressure sensor set up respectively on the pipeline that the gas flows through, secondary flow calculation instrument respectively with gaseous operating mode volumetric flowmeter, gas temperature sensor, gas pressure sensor electric connection.
Further, the gas working condition volume flowmeter is a throttling flowmeter or a vortex shedding flowmeter.
Further, the gas temperature sensor is a thermocouple or a thermal resistor.
Further, the gas condition volumetric flowmeter is located upstream of the gas temperature sensor, and the gas temperature sensor is located upstream of the gas pressure sensor.
The method for measuring the gas mass flow by using the gas mass flowmeter comprises the following steps:
measuring gas differential pressure values delta P (a differential pressure value obtained by subtracting a gas pressure value at a second position from a gas pressure value at a first position) at two positions in a pipeline through which gas flows by a gas working condition volume flowmeter;
measuring a gas temperature t in a pipe through which the gas flows by a gas temperature sensor;
measuring a gas pressure P in a pipe through which the gas flows by a gas pressure sensor;
calculating the gas mass flow rate through a secondary flow calculating instrument according to the following formula:
in the formula, ρWorking conditions＝ρ20×[(101+P)×(273.15+20)]/[101×(273.15+t)]
Wherein Fc represents a flow coefficient; Δ P represents a differential gas pressure value in Pa; d20Represents the diameter of the pipe through which the gas flows, and has the unit of m; t represents the gas temperature in units of; p represents gas pressure in KPa; rhoWorking conditionsDenotes the gas density in kg/m3；ρ20The density of the gas at 20 ℃ standard state is expressed in kg/m3；GQuality ofRepresenting the gas mass flow in t/h.
When the gas to be measured is air, the flow coefficient Fc is equal to 3.366870.
The utility model has the advantages that: (1) within the accuracy requirement of 1.5%, the gas mass flowmeter of the utility model has high performance-to-cost ratio, and the larger the caliber is, the more remarkable the performance-to-cost ratio is; the price of a conventional gas mass flowmeter such as DN300 is more than 50 ten thousand yuan, and the price of the whole set of the device of the gas mass flowmeter of the utility model is not more than 15 ten thousand yuan. (2) The applicable pipe diameter can be larger than DN300, and the precision is controlled within 3%.
Drawings
Fig. 1 is a schematic view of the gas mass flowmeter of the present invention.
Fig. 2 is a schematic structural diagram of the gas mass flowmeter of the present invention.
Fig. 3 is a schematic diagram of the circuit principle of the secondary flow meter of the present invention.
The reference signs explain: 100. the gas working condition volume flowmeter comprises a gas working condition volume flowmeter body, 101, a throttling device, 102, a differential pressure transmitter, 103, a first pressure sampling pipe, 104, a second pressure sampling pipe, 105, a needle valve, 106, a condensing tank, 107, a three-valve group, 200, a gas temperature sensor and 300, and a gas pressure sensor. 400. The secondary flow calculating instrument comprises 500 signal lines, 600 blow-off pipes, 700 blow-off valves and 900 pipelines through which gas flows.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in FIGS. 1-3, the utility model provides a pair of gas mass flow meter, including gaseous operating mode volumetric flowmeter 100, gas temperature sensor 200, gas pressure sensor 300 and secondary flow meter 400.
The gas working condition volume flowmeter 100 comprises a throttling device 101, a first pressure sampling pipe 103, a second pressure sampling pipe 104, two needle valves 105, two condensing tanks 106, three groups of valves 107 and a differential pressure transmitter 102, wherein the throttling device 101 is installed on a pipeline 900 through which gas flows, the differential pressure transmitter 102 is connected with the throttling device 101 through the first pressure sampling pipe 103 and the second pressure sampling pipe 104, and the first pressure sampling pipe 103 and the second pressure sampling pipe 104 are both provided with the needle valves 105 and the condensing tanks 106. The first pressure sampling pipe 103 and the second pressure sampling pipe 104 are both connected with a blow-off pipe 600, and the blow-off pipe 600 is provided with a blow-off valve 700. The differential pressure transmitter 102 is connected with a secondary flow calculation instrument 400 through a signal line 500, and transmits measured gas differential pressure information through a DC 4-20 mA current signal.
The gas temperature sensor 200 employs a thermal resistor Pt100 and is installed on a pipe 900 through which gas flows. The gas temperature sensor 200 is connected to the secondary flow computing instrument 400 through a signal line 500 for transmitting measured gas temperature information.
The gas pressure sensor 300 is installed on a pipe 900 through which gas flows, and is connected to the secondary flow rate computing instrument 400 through a signal line 500 for transmitting measured gas pressure information.
The secondary flow calculating instrument 400 comprises a single-chip microcomputer, and a volume flow signal AD conversion circuit, a temperature signal conditioning and AD conversion circuit, a pressure signal AD conversion circuit, a set key input circuit, an LCD display driving circuit and a mass flow DA conversion circuit which are connected with the single-chip microcomputer. The volume flow signal AD conversion circuit is connected to the differential pressure transmitter 102, the temperature signal conditioning and AD conversion circuit is connected to the gas temperature sensor 200, and the pressure signal AD conversion circuit is connected to the gas pressure sensor 300, and converts the measured gas differential pressure, temperature, and pressure information into digital signals. The model of the single-chip microcomputer can be STM32F103VCT 6. The microcomputer is solidified with a calculation program, calculates the real-time density of the gas through the solidified calculation program, and then calculates the mass flow according to the real-time density and the real-time gas differential pressure value. The calculation program calculates the gas mass flow according to the following formula:
in the formula, ρWorking conditions＝ρ20×[(101+P)×(273.15+20)]/[101×(273.15+t)]
Wherein Fc represents a flow coefficient; Δ P represents a differential gas pressure value in Pa; d20Represents the diameter of the pipe through which the gas flows, and has the unit of m; t represents the gas temperature in units of; p represents gas pressure in KPa; rhoWorking conditionsDenotes the gas density in kg/m3；ρ20The density of the gas at 20 ℃ standard state is expressed in kg/m3；GQuality ofThe flow coefficient Fc can be determined according to the national standard GB/T2624-93 (the flow rate of the fluid filling the round tube is measured by the orifice plate, the nozzle and the venturi tube of the flow measurement throttling device), in which the flow coefficient is represented by the symbol α.
The mass flow DA conversion circuit can be connected with a DCS control system, and the calculation result can be output to the DCS control system through a DC 4-20 mA standard instrument current signal.
Example 1
The medium to be measured flowing through the pipe 900 is air. The relevant parameters are as follows: the working pressure P is 340 KPa; the working condition temperature T is 36.3 ℃; maximum flow Q of 10000Nm3H; density p20Is 1.205kg/m3(ii) a The process tube diameter D was phi 377 x 8.5.
The specification of the throttling device 101 of the gas working condition volume flowmeter 100 is phi 377 x 8.5, and the geometric dimensions are as follows: the outer diameter D is 377mm (consistent with the diameter D of the process pipeline), the inner diameter D is 360mm, and Fc is 3.366870; the resulting differential pressure value is measured by differential pressure transmitter 102. The range of the differential pressure transmitter 102 is 0-500 Pa; the measured differential pressure Δ P was 197 Pa.
The range of the gas pressure sensor 300 is 0-100 KPa; the measured pressure P is 340 KPa.
The range of the gas temperature sensor 200 is 0-100 ℃; the measured temperature t is 36.3 ℃.
The actually measured differential pressure, temperature, pressure and other parameter signals are directly accessed to the secondary flow calculation instrument 400 for flow calculation:
(1) medium density in working state:
ρworking conditions＝1.205×[(101+340)×(273.15+20)]/[101×(273.15+36.3)]
ρWorking conditions＝4.9842kg/m3
(2) Gas mass flow rate:
Claims (4)
1. a gas mass flow meter for measuring the mass flow of a gas in a conduit through which the gas flows, characterized by: including gas operating mode volumetric flowmeter, gas temperature sensor, gas pressure sensor and secondary flow calculation instrument, gas operating mode volumetric flowmeter, gas temperature sensor, gas pressure sensor set up respectively on the pipeline that the gas flows through, secondary flow calculation instrument respectively with gas operating mode volumetric flowmeter, gas temperature sensor, gas pressure sensor electric connection.
2. The gas mass flow meter of claim 1, wherein: the gas working condition volume flowmeter is a throttling flowmeter or a vortex shedding flowmeter.
3. The gas mass flow meter of claim 1, wherein: the gas temperature sensor is a thermocouple or a thermal resistor.
4. The gas mass flow meter of claim 1, wherein: the gas working condition volume flowmeter is positioned at the upstream of the gas temperature sensor, and the gas temperature sensor is positioned at the upstream of the gas pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921588132.5U CN210268772U (en) | 2019-09-24 | 2019-09-24 | Gas mass flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921588132.5U CN210268772U (en) | 2019-09-24 | 2019-09-24 | Gas mass flowmeter |
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| CN210268772U true CN210268772U (en) | 2020-04-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU221322U1 (en) * | 2023-07-04 | 2023-10-31 | Евгений Евгеньевич Ступин | Portable liquid flow meter indicator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU221322U1 (en) * | 2023-07-04 | 2023-10-31 | Евгений Евгеньевич Ступин | Portable liquid flow meter indicator |
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