Flow velocity and pressure integrated measuring instrument for online monitoring of flue gas by using pitot tube method
阅读说明：本技术 一种用于烟气在线监测的皮托管法的流速压力一体式测量仪 (Flow velocity and pressure integrated measuring instrument for online monitoring of flue gas by using pitot tube method ) 是由 陈青 李汉汉 李泽彪 梁社楼 冼祖运 于 2019-10-31 设计创作，主要内容包括：本发明提供了一种超低流速测量仪及控制技术,包括壳体、S型皮托管、压力传感器、差压传感器、铝合金腔体、快接接头、反吹装置、电路控制板、显示操作部件、二位二通电磁阀、二位三通电磁阀、传感器电路屏蔽外壳。所述S型皮托管包括动压气端、静压气端、温度传感器。所述动压气端和所述静压气端分别通过所述快接接头与两位三通电磁阀连接,所述2个两位三通电磁阀与铝合金腔体连通。所述反吹装置通过所述快接接头连接于所述铝合金腔体底端。所述二位三通电磁阀连接于所述铝合金腔体上端,所述压力传感器和所述差压传感器分别安装于所述电路控制板,并通过所述传感器电路屏蔽外壳安装于所述铝合金腔体中部。(The invention provides an ultra-low flow velocity measuring instrument and a control technology, which comprises a shell, an S-shaped pitot tube, a pressure sensor, a differential pressure sensor, an aluminum alloy cavity, a quick connector, a back flushing device, a circuit control board, a display operation part, a two-position two-way electromagnetic valve, a two-position three-way electromagnetic valve and a sensor circuit shielding shell. The S-shaped pitot tube comprises a pneumatic pressure end, a static pressure end and a temperature sensor. The pneumatic air end and the static air end are respectively connected with a two-position three-way electromagnetic valve through the quick connector, and the 2 two-position three-way electromagnetic valves are communicated with the aluminum alloy cavity. And the back flushing device is connected to the bottom end of the aluminum alloy cavity through the quick connector. The two-position three-way electromagnetic valve is connected to the upper end of the aluminum alloy cavity, the pressure sensor and the differential pressure sensor are respectively arranged on the circuit control board and are arranged in the middle of the aluminum alloy cavity through the sensor circuit shielding shell.)
1. An ultra-low flow velocity measuring instrument and a control technology applied to CEMS are characterized by comprising a shell, an S-shaped pitot tube, a pressure sensor, a differential pressure sensor, an aluminum alloy cavity, a quick connector, a back flushing device, a circuit control board, a display operation part, a two-position two-way electromagnetic valve, a two-position three-way electromagnetic valve and a sensor circuit shielding shell; the S-shaped pitot tube comprises a pneumatic pressure end, a static pressure end and a temperature sensor; the dynamic pressure air end and the static pressure air end are respectively connected with two-position three-way electromagnetic valves through the quick connectors, and the 2 two-position three-way electromagnetic valves are communicated with the aluminum alloy cavity; the back blowing device is connected to the bottom end of the aluminum alloy cavity through the quick connector; the two-position three-way electromagnetic valve is connected to the upper end of the aluminum alloy cavity, and the pressure sensor and the differential pressure sensor are respectively arranged on the circuit control board and are arranged in the middle of the aluminum alloy cavity through the sensor circuit shielding shell; the circuit control board is arranged in the middle of the ultralow flow velocity measuring instrument applied to the CEMS.
2. The S-shaped pitot tube of claim 1, wherein one end of the pitot tube is installed in a chimney, the other end of the pitot tube is connected with the aluminum alloy cavity, and the S-shaped pitot tube has the characteristic of being not easy to block.
3. The differential pressure sensor of claim 1, wherein the differential pressure sensor employs inlet micro differential pressure sensing technology with corrosion, electromagnetic and radio frequency interference resistance.
4. The pressure sensor of claim 1, wherein the aluminum alloy chamber is connected to the differential pressure sensor and the pitot tube, so as to ensure the consistency of the pitot tube inlet static pressure, the differential pressure sensor static pressure and the pressure sensor pressure.
5. The differential pressure sensor of claim 3 and the pressure sensor of claim 4, wherein the gas circuit connections for measuring differential pressure and pressure are communicated through the integral aluminum alloy cavity, thereby avoiding the precision error caused by the easy deformation of the pipeline connections.
6. The ultra-low flow rate measurement instrument and control technique applied to CEMS of claim 1, wherein the automatic back-flushing and automatic zero calibration techniques are adopted to ensure the accuracy of ultra-low flow rate measurement.
7. The automatic back flushing technology of claim 6, wherein the back flushing device is connected to the bottom end of the aluminum alloy cavity, the back flushing pipeline is communicated with a two-position three-way valve, and when the system starts the back flushing function, the system is communicated with a pitot tube, and back flushing is performed on a dynamic pressure port and a static pressure port of the pitot tube through compressed air.
8. The automatic zero calibration technique of claim 6, wherein the two-position three-way solenoid valves are used to cut off the connection with the external air path and communicate the dynamic pressure and the static pressure of the pressure sensor, and then the zero calibration is performed.
9. The automatic zero calibration technique of claim 8, wherein when the two-position three-way solenoid valve is switched in zero calibration, both ends of the pitot tube dynamic pressure and static pressure are connected with compressed air, so that zero calibration and back flushing are performed simultaneously.
10. The ultra-low flow rate measurement instrument and control technique for CEMS of claim 1, wherein the differential pressure sensor and the pressure sensor, which are used independently, and the circuit control board are sealed by a sealing structure, so as to avoid the influence of electromagnetic interference and other factors.
11. The circuit control board of claim 10, wherein the circuit design of the sensor is independent from the main control circuit board, the circuit control board comprises a signal acquisition module, a signal output module, and a temperature detection module, and the sensor circuit is designed with signal amplification and output for the pressure sensor and the differential pressure sensor, and is connected to the circuit control main board.
Technical Field
The invention relates to the technical field of flue gas monitoring, in particular to an ultra-low flow rate measuring instrument and a control technology applied to CEMS.
Background
The emission of industrial flue gas is strictly in accordance with national emission standards, and in order to detect the emission state of industrial flue gas, a plurality of different instruments are used for detecting various detection factors in a flue gas emission system.
Disclosure of Invention
The invention aims to provide an ultra-low flow rate measuring instrument and a control technology applied to CEMS, so as to solve the technical problem that the prior art can not realize accurate measurement of the ultra-low flue gas flow rate.
The invention provides an ultra-low flow velocity measuring instrument and a control technology applied to CEMS, comprising a shell, an S-shaped pitot tube, a pressure sensor, a differential pressure sensor, an aluminum alloy cavity, a quick connector, a back flushing device, a circuit control board, a display operation part, a two-position two-way electromagnetic valve, a two-position three-way electromagnetic valve and a sensor circuit shielding shell. The S-shaped pitot tube comprises a pneumatic pressure end, a static pressure end and a temperature sensor. The pneumatic air end and the static air end are respectively connected with a two-position three-way electromagnetic valve through the quick connector, and the 2 two-position three-way electromagnetic valves are communicated with the aluminum alloy cavity. And the back flushing device is connected to the bottom end of the aluminum alloy cavity through the quick connector. The two-position three-way electromagnetic valve is connected to the upper end of the aluminum alloy cavity, the pressure sensor and the differential pressure sensor are respectively arranged on the circuit control board and are arranged in the middle of the aluminum alloy cavity through the sensor circuit shielding shell. The circuit control board is arranged in the middle of the ultralow flow velocity measuring instrument applied to the CEMS.
Specifically, pitot tube one end install in the chimney, the other end with the aluminum alloy cavity be connected, adopt S type pitot tube have characteristics such as difficult jam.
Specifically, the differential pressure sensor adopts an inlet micro differential pressure sensing technology and has the characteristics of corrosion resistance, electromagnetic resistance and radio frequency interference resistance.
Specifically, the pressure sensor is connected with the aluminum alloy cavity and communicated with the static pressure end of the differential pressure sensor and the static pressure end of the pitot tube, so that the consistency of the static pressure at the inlet of the pitot tube, the static pressure of the differential pressure sensor and the pressure of the pressure sensor is ensured.
Furthermore, the differential pressure sensor and the air circuit connection of the pressure sensor for measuring differential pressure and pressure are communicated through the integral aluminum alloy cavity, so that the problem that the precision error is caused by the fact that the pipeline connection is easy to deform is avoided.
Specifically, the ultra-low flow rate measuring instrument and the control technology applied to the CEMS adopt automatic back flushing and automatic zero calibration technologies, and accuracy of ultra-low flow rate measurement is guaranteed.
Furthermore, the back flushing device of the automatic back flushing technology is connected with the bottom end of the aluminum alloy cavity, a back flushing pipeline is communicated with the two-position three-way valve, the system is communicated with the pitot tube when the back flushing function is started, and back purging is carried out on dynamic pressure and static pressure ports of the pitot tube through compressed air.
Furthermore, the automatic zero calibration technology adopts an automatic zero calibration technology, the connection with an external air circuit is cut off through the two-position three-way electromagnetic valves, the dynamic pressure and the static pressure of the pressure sensor are communicated, and then zero calibration is carried out.
Furthermore, when the two-position three-way electromagnetic valve is switched in the zero calibration of the automatic zero calibration technology, the dynamic pressure and static pressure ends of the pitot tube are connected with compressed air, so that the zero calibration and the back flushing are simultaneously carried out.
Preferably, the differential pressure sensor, the pressure sensor and the circuit control main board which are independently adopted by the ultra-low flow rate measuring instrument and the control technology applied to the CEMS are sealed by a sealed structural member, so that the influence of factors such as electromagnetic interference can be avoided.
Specifically, the circuit control board is characterized in that the circuit design of the pressure sensor and the differential pressure sensor is independently separated from the main control circuit control board, the circuit control board comprises a signal acquisition module, a signal output module and a temperature detection module, and the sensor circuit is designed with signal amplification and output of the pressure sensor and the differential pressure sensor and connected with the circuit control main board.
Therefore, the ultra-low flow rate measuring instrument and the control technology applied to the CEMS are adopted, the ultra-low flow rate measuring instrument and the control technology are applicable to continuous online measurement of ultra-low flow rate flue gas, and the accuracy and the reliability of a flue gas measurement result are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an ultra-low flow rate measuring instrument applied to CEMS according to an embodiment of the present invention.
Wherein the reference numerals are summarized as follows:
the device comprises a shell 1, an S-
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Fig. 1 is a diagram illustrating an ultra-low flow rate measurement apparatus and control technique applied to CEMS according to an embodiment of the present invention.
As shown in fig. 1, the present invention provides an ultra-low flow rate measurement instrument and a control technique applied to a CEMS, including a housing 1, an S-
The S-shaped pitot tube comprises a dynamic
Specifically, 2 one end of S type pitot tube install in the chimney, the other end with aluminum alloy cavity 5 be connected, adopt S
Specifically, the differential pressure sensor 4 adopts an inlet micro differential pressure sensing technology, and has the characteristics of corrosion resistance, electromagnetic resistance and radio frequency interference resistance.
Specifically, the pressure sensor 3 is connected with the aluminum alloy cavity 5 and communicated with the static pressure end of the differential pressure sensor 4 and the static pressure end of the S-
Further, the air circuit connection of the differential pressure sensor 4 and the pressure sensor 3 for measuring differential pressure and pressure is communicated through the integral aluminum alloy cavity 5, so that the problem that the precision error is caused by the deformation of pipeline connection is avoided.
Specifically, the ultra-low flow rate measuring instrument and the control technology applied to the CEMS adopt automatic back flushing and automatic zero calibration technologies, and accuracy of ultra-low flow rate measurement is guaranteed.
Further, the
Further, the automatic zero calibration technology adopts an automatic zero calibration technology, the connection with an external air path is cut off through the two-position three-way electromagnetic valves 11, the dynamic pressure and the static pressure of the pressure sensor 3 are communicated, and then zero calibration is performed.
Further, when the two-position three-way electromagnetic valve 11 is switched in the zero calibration of the automatic zero calibration technology, both ends of the dynamic pressure and the static pressure of the
Preferably, the differential pressure sensor 4, the pressure sensor 3 and the circuit control
Specifically, the circuit control board the circuit design of the pressure sensor 3 and the differential pressure sensor 4 is independently separated from the main control
Therefore, the ultra-low flow rate measuring instrument and the control technology applied to the CEMS are adopted, the ultra-low flow rate measuring instrument and the control technology are applicable to continuous online measurement of ultra-low flow rate flue gas, and the accuracy and the reliability of a flue gas measurement result are improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.