CN208187809U - A kind of detection of gas flow rate control device - Google Patents
A kind of detection of gas flow rate control device Download PDFInfo
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- CN208187809U CN208187809U CN201820829140.3U CN201820829140U CN208187809U CN 208187809 U CN208187809 U CN 208187809U CN 201820829140 U CN201820829140 U CN 201820829140U CN 208187809 U CN208187809 U CN 208187809U
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Abstract
A kind of detection of gas flow rate control device, comprising: sampling unit, airflow measurement unit and flow controlling unit；The sampling unit is responsible for acquiring gas；The airflow measurement unit is responsible for measuring the flow of collected gas；The gas flow signals measured are sent to flow controlling unit by airflow measurement unit；Flow controlling unit regulates and controls the sampling unit according to the gas flow signals.It can be realized the control by setting flow collection high temperature corrosive gas.
Description
Technical field
The utility model relates in the industries such as environmental protection, petrochemical industry, steel more particularly to a kind of detection of gas flow rate control dress
It sets.
Background technique
It in industries such as environmental protection, petrochemical industry, steels, needs to sample high temperature, corrosive gas, current main sampling side
Method is that sampling pump directly samples.Directly sampling when sampling pump, flowmeter etc. be required to high temperature resistant, corrosion-resistant, this is to sampling pump, stream
The equipment requirements such as meter are very high, to cause the problems such as at high cost, maintenance is big, high failure rate.
Isokinetic sampling is the specific process in flue dust sampling, as obtains representational sample, is entirely sampling
The speed for making ash-laden gas enter sampling mouth in the process is equal with the velocity of flue gas of the point in flue.When measuring point velocity of flue gas is small
When flue gas enters the speed of sampling mouth, the dust concentration value of measurement is relatively low；It is adopted when measuring point velocity of flue gas enters greater than flue gas
When the speed of sample mouth, the dust concentration value of measurement is higher.
When sample rate be more than or less than sampled point velocity of flue gas will all make sampled result generate deviation, work as sample rate
When Vn is greater than velocity of flue gas Vs, the fraction other than sampling mouth line enters sampling mouth, and grit therein is due to this
The effect of inertia of body cannot change direction with air-flow and enter sampling mouth, continue on original direction and advance, make the sample taken
Concentration is lower than the actual concentrations of sampled point.When sample rate Vn is less than the velocity of flue gas Vs of sampled point, situation is just the opposite, sample
Product concentration is higher than actual concentrations.When only sample rate Vn is equal to the speed Vs of sampled point, sample concentration ability and actual concentrations phase
Deng.
Utility model content
In order to solve the above-mentioned technical problem, the utility model proposes a kind of controls of detection of gas flow rate to fill, it can be realized
By the control of setting flow collection high temperature corrosive gas.
To achieve the goals above, the scheme that the utility model uses is:
A kind of detection of gas flow rate control device, comprising: sampling unit, airflow measurement unit and flow controlling unit；
The sampling unit is responsible for acquiring gas；The airflow measurement unit is responsible for measuring the flow of collected gas；Flow measurement
The gas flow signals measured are sent to flow controlling unit by unit；Flow controlling unit is according to the gas flow signals
The sampling unit is regulated and controled.
The sampling unit includes: pneumatic triple piece and jet pump.
The airflow measurement unit includes: Venturi tube, differential pressure flowmeter, pressure transmitter, temperature sensor and temperature
Spend transmitter.
The flow controlling unit includes: ratio adjusting valve and the analyzer-controller for controlling ratio adjusting valve.
The jet pump is made of stainless steel material.
The Venturi tube is made of stainless steel material.
The beneficial effects of the utility model have: the pressure by controlling room temperature clean gas is realized by setting flow collection
The control of high temperature corrosive gas.
Detailed description of the invention
Fig. 1 shows structural schematic diagram according to an embodiment of the present application；
Fig. 2 shows the structural schematic diagrams of jet pump according to an embodiment of the present application；
Fig. 3 shows the structural schematic diagram of Venturi tube according to an embodiment of the present application.
Wherein, 1 pneumatic triple piece；2 ratio adjusting valves；3 jet pumps；4 Venturi tubes；5 analyzer-controllers；6 flow measurements
Device.
Specific embodiment
In order to be better understood by the technical solution of the utility model, the utility model is made furtherly with reference to the accompanying drawing
It is bright.
As shown in Figure 1-3, a kind of detection of gas flow rate control device, sampling unit, airflow measurement unit and flow control
Unit processed；The sampling unit is responsible for acquiring gas；The airflow measurement unit is responsible for measuring the flow of collected gas；Stream
The gas flow signals measured are sent to flow controlling unit by phasor measurement unit；Flow controlling unit is according to the gas stream
Amount signal regulates and controls the sampling unit.
The sampling unit includes: pneumatic triple piece 1 and jet pump 3.Working fluid of the compressed gas as jet pump leads to
Pneumatic triple piece and the laggard incident flow pump of equal proportion regulating valve are crossed, when working fluid is sprayed from the nozzle at high speeds of jet pump, in larynx
Vacuum is formed because the air of surrounding is swept away by jet stream at tube inlet, sample gas is inhaled into, to achieve the purpose that sampling.
The airflow measurement unit includes: Venturi tube 4 and flow measurement device 6.The flow measurement device includes: difference
Pressure type flowmeter, pressure transmitter, temperature sensor and temperature transmitter.Gas generates pressure difference by Venturi tube, and differential pressure passes
Sensor measures pressure difference, obtains gas flow according to bernoulli equation, calculates and passes through further according to the pressure and temperature of test point
The mark condition flow of venturi gas.The differential pressure that differential pressure flowmeter detection Venturi tube generates is calculated by analyzer-controller
Flow, pressure transmitter, temperature sensor and temperature transmitter are compensated to the differential pressure signal.
The flow controlling unit includes: ratio adjusting valve 2 and the analyzer-controller 5 for controlling ratio adjusting valve.
Analysis controller reads the sampling flow of flow detection unit detection in real time, increases flesh or reduction after comparing setting flow and sampling flow
The aperture of equal proportion regulating valve, adjusts the pressure size of sampling jet pump working fluid, to reach the mesh of control sampling flow
's.
The jet pump is made of stainless steel material.
The Venturi tube is made of stainless steel material.
As shown in Fig. 2, the nozzle through jet pump quickly sprays after compressed gas enters jet pump as working fluid, expanding
Negative pressure is formed at separate tube, by the through enturi tube sucking jet pump of sample gas, discharging jet is pumped after working fluid is mixed with sample gas.
As shown in figure 3, sample gas forms pressure difference between air inlet and Venturi tube throat by Venturi tube, it should by measurement
Place's pressure difference can calculate the flow of the sample gas by Venturi tube, and calculation formula is shown in formula 1:
Wherein, involved parameter in formula are as follows:
Qn: gas flow；
K: Venturi tube coefficient；
Pd: differential pressure value；
ρ: gas density.
Analyzer-controller real-time detection is calculated through the gas flow of Venturi tube, by this detection flows and setting flow into
Row compares, and the aperture of equal proportion regulating valve is turned down if the flow measured is greater than setting flow, if the flow measured
Less than the aperture that setting flow then tunes up equal proportion regulating valve, the flow of sample gas is made to reach consistent with setting flow.
The course of work of the utility model:
The flow that need to be sampled is set first in analyzer-controller, output signal controls ratio adjusting valve after controller calculates
Aperture, compressed gas are pumped through pneumatic triple piece, the laggard incident flow of ratio adjusting valve.
Equal proportion regulating valve is opened to default aperture, working fluid (compressed air) is made to enter jet pump, jet pump will
Jet pump is sprayed after mixing in sample aspiration incident flow pump and with working fluid；Sample gas is flowed by forming pressure difference when Venturi tube
Amount detection unit detects to flow through the sample throughput of Venturi tube；Analyzer-controller compares the sampling flow and sample throughput of setting
Difference adjusts the aperture of equal proportion regulating valve, and sample throughput and the sampling flow of setting is made to reach consistent.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but it is not practical new to this
The limitation of type protection scope, those skilled in the art should understand that, based on the technical solution of the present invention, ability
Field technique personnel do not need to make the creative labor the various modifications or changes that can be made still in the protection model of the utility model
Within enclosing.
Claims (6)
1. a kind of detection of gas flow rate control device characterized by comprising sampling unit, airflow measurement unit and flow
Control unit；The sampling unit is responsible for acquiring gas；The airflow measurement unit is responsible for measuring the flow of collected gas；
The gas flow signals measured are sent to flow controlling unit by airflow measurement unit；Flow controlling unit is according to the gas
Flow signal regulates and controls the sampling unit.
2. a kind of detection of gas flow rate control device according to claim 1, which is characterized in that the sampling unit packet
It includes: pneumatic triple piece and jet pump.
3. a kind of detection of gas flow rate control device according to claim 1, which is characterized in that the airflow measurement unit
It include: Venturi tube, differential pressure flowmeter, pressure transmitter, temperature sensor and temperature transmitter.
4. a kind of detection of gas flow rate control device according to claim 1, which is characterized in that the flow controlling unit
It include: ratio adjusting valve and the analyzer-controller for controlling ratio adjusting valve.
5. a kind of detection of gas flow rate control device according to claim 2, which is characterized in that the jet pump is by stainless
Steel material is made.
6. a kind of detection of gas flow rate control device according to claim 3, which is characterized in that the Venturi tube is not by
Rust steel material is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820829140.3U CN208187809U (en) | 2018-05-30 | 2018-05-30 | A kind of detection of gas flow rate control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820829140.3U CN208187809U (en) | 2018-05-30 | 2018-05-30 | A kind of detection of gas flow rate control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208187809U true CN208187809U (en) | 2018-12-04 |
Family
ID=64427983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820829140.3U Active CN208187809U (en) | 2018-05-30 | 2018-05-30 | A kind of detection of gas flow rate control device |
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| CN (1) | CN208187809U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111230055A (en) * | 2020-03-18 | 2020-06-05 | 无锡梯威信息科技有限公司 | Automatic argon gas control device for preventing oxidation during steel pouring |
-
2018
- 2018-05-30 CN CN201820829140.3U patent/CN208187809U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111230055A (en) * | 2020-03-18 | 2020-06-05 | 无锡梯威信息科技有限公司 | Automatic argon gas control device for preventing oxidation during steel pouring |
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