TWM503559U - Gas flow measurement system - Google Patents

Abstract

A gas flow measurement system is provided, wherein pressure difference of a static pressure pipeline and a total pressure pipeline is obtained by a gas pressure gauge for estimating gas flow of measuring ambient. The gas flow measurement system can automatically determine the gas pressure gauge and the total pressure pipeline whether in a abnormal state.

Description

Gas flow measurement system

This creation is about a measurement system, in detail, a gas flow measurement system that estimates the flow by the pressure difference between static pressure and full pressure.

Due to the advancement of the human industry, the air pollution in the living environment is gradually increasing. For humans, air pollution can affect human health and cause diseases such as breathing, for example, asthma, dry cough, headache, eyes and nose. Allergies with the throat.

Therefore, how to reduce air pollution has become a common issue in the major industrial countries in the world. In Taiwan, the Environmental Protection Agency has required emission control of exhaust emissions, so that a gas flow measurement system is usually installed in the exhaust gas discharge line, and the discharge pipe is measured through a pressure gauge in the gas flow measurement system. The pressure difference between the static pressure of the exhaust gas and the total pressure, and the flow rate of the exhaust gas in the discharge line is estimated by the formula of the pressure difference and the flow rate. However, there is currently no effective method for online pressure gauges for gas flow measurement systems. To determine whether they are functioning properly, they are often performed on-site by engineering personnel. As a result, the flow control of exhaust emissions cannot be implemented.

Therefore, how to solve the problem that the pressure gauge in the gas flow measurement system cannot be detected online is a technical issue that the current industry is concerned about.

In view of the above-mentioned shortcomings of the prior art, the present invention provides a gas flow measuring system having static pressure enthalpy, full pressure enthalpy and atmospheric enthalpy. The static pressure 全 and the full pressure 埠 are used to respectively receive the static pressure and the full pressure of the airflow in the measurement environment, and have a static pressure pipeline and a full pressure pipeline for respectively connecting the static pressure 全 and the full pressure 埠, respectively. The pressure gauge is used to measure the air pressure connecting the static pressure pipeline and the full pressure pipeline, and the pressure difference between the static pressure and the full pressure of the ambient airflow is measured, and then the pressure difference and the flow rate conversion formula are used to estimate the measurement environment. The flow of airflow. The gas flow measurement system of the present invention also includes a detection pipeline, a pneumatic source, a detection control module, and a controller. The test piping is connected to the full pressure pipeline. The air pressure source provides gas to the test line. The detection control module has a barometer for measuring the air pressure in the detection pipeline. When the controller performs the first abnormality detection, the communication between the static pressure and the static pressure pipeline is cut off, and the connection between the full pressure and the full pressure pipeline is cut off, and the static pressure pipeline is connected to the atmosphere. So that the air pressure inside the static pressure pipeline conforms to the atmospheric pressure, and the air pressure source supplies gas to the detection pipeline. When the air pressure measurement pressure reaches the predetermined detection air pressure value, the air pressure source stops supplying air to the detection pipeline. In order to make the pressure inside the full pressure pipeline comply with the detected air pressure.

Alternatively, the gas flow measurement system of the present invention further includes a communication line, and the controller is configured to cut off the connection between the static pressure and the static pressure line when the second abnormality detection is performed, and cut off the full pressure and The communication of the full pressure pipeline and the communication pipeline connects the static pressure pipeline and the full pressure pipeline to the atmosphere, so that the air pressure inside the static pressure pipeline and the full pressure pipeline conforms to atmospheric pressure. When the controller performs the third abnormality detection, it cuts off the connection between the full pressure and the pressure gauge and the full pressure pipeline, and causes the air pressure source to supply gas to the detection pipeline, and when the air pressure measurement reaches the predetermined pressure value. When the air pressure value is detected, the air pressure source stops supplying air to the detection pipeline so that the air pressure inside the full pressure pipeline conforms to the detected air pressure.

Alternatively, the gas flow measurement system of the present invention further includes a cleaning pipeline, the air pressure source can also supply high pressure gas to the cleaning pipeline, and the controller is used to cut the static pressure when cleaning the static pressure 全 and the full pressure 埠.连通 Connect with the static pressure pipeline, and cut off the connection between the full pressure 埠 and the full pressure pipeline, and connect the clean pipeline with the static pressure 全 and the full pressure , to provide high pressure gas to the static pressure 全 and the full pressure 埠, 俾 clean static pressure 全 and full pressure 埠.

Compared with the prior art, the gas flow measuring system of the present invention can input a simulated gas pressure to a pressure gauge for measuring the pressure difference between the static pressure pipeline and the full pressure pipeline of the ambient airflow, and can judge the pressure gauge. Whether it is abnormal to solve the problem that the pressure gauge cannot be detected online. In addition, the gas flow measurement system of the present invention can supply high pressure gas to the static pressure line and the full pressure line for cleaning.

The following content will be described in conjunction with the drawings, and the technical contents of the present invention will be described by a specific embodiment. Those skilled in the art can easily understand other advantages and effects of the present invention by the contents disclosed in the present specification. This creation can also be implemented or applied by other different embodiments. The details of the present specification can also be modified and changed in accordance with the different viewpoints and applications without departing from the spirit of the present invention. In particular, the proportional relationship and relative position of the various elements in the drawings are for exemplary purposes only and are not representative of actual implementation of the present invention.

The following series presents several technically representative embodiments. In order to simplify the disclosure of the present invention, the same or similar elements are described by the same symbols in the various embodiments, and the same or similar descriptions are made in a simplified manner.

First embodiment

Please refer to FIG. 1 to FIG. 2 , which are schematic diagrams of a first embodiment of the creation gas flow measurement system. As shown in the figure, the gas flow measuring system 1 of the present embodiment can be installed in a discharge line of an exhaust gas, and has a static pressure 埠11, a full pressure enthalpy 12, an atmospheric enthalpy 14, a pressure gauge 15, and a static pressure pipeline 131. With full pressure line 132. Among them, the pressure gauge 15 is, for example, a differential pressure type pressure gauge. The static pressure enthalpy 11 and the full pressure enthalpy 12 are used to respectively receive the static pressure and the full pressure of the airflow of the measurement environment, and the measurement environment is the internal space of the discharge pipeline. One end of the static pressure line 131 and the full pressure line 132 respectively communicates the static pressure 埠11 and the full pressure 埠12, and the other end is connected to the pressure gauge 15 respectively for providing the pressure gauge 15 with static pressure for measuring the ambient airflow. With the full pressure, the pressure gauge 15 can measure the pressure difference between the static pressure and the full pressure of the airflow in the measurement environment, and by the value of the pressure difference, the pressure difference and the flow rate conversion formula can be used to estimate the measurement environment. The flow of airflow.

Specifically, when the gas flow measurement system of the present invention performs gas flow measurement, the first gate valve 1311 and the second gate valve 1321 on the static pressure line 131 and the full pressure line 132 are opened, respectively, and the pressure gauge 15 is respectively Provides static and full pressure of the airflow in the measurement environment. As shown in FIG. 2, the static pressure enthalpy 11 has a static pressure gas collection port 111 which is parallel to the flow direction of the ambient gas flow 2, thereby obtaining a static pressure of the gas flow in the measurement environment; the full pressure enthalpy 12 has The full pressure gas collection port 121 is perpendicular to the flow direction of the ambient gas flow 2, so that the total pressure of the gas flow in the measurement environment can be obtained.

In addition, the gas flow measurement system of the present invention further has an air pressure source 17, a detection control module 18, a controller 19, a detection line 133 and an atmospheric line 136, thereby performing an abnormality detection on the pressure gauge 15. The air pressure source 17 can supply the gas to the detecting line 133. The detecting line 133 has a third gate valve 1331. The controller 19 can open the third gate valve 1331, so that the air pressure source 17 can supply the gas to the detecting line 133. The pressure of the simulated gas is input to the pressure gauge 15, and the pressure value measured by the pressure gauge 15 determines whether the pressure gauge 15 is abnormal. The detection control module 18 has a barometer 181 for measuring the air pressure inside the detection line 133.

Furthermore, the two ends of the atmospheric line 136 are respectively connected to the atmospheric enthalpy 14 and the static pressure line 131, and the atmospheric line 136 has a sixth gate valve 1361. The controller 19 can open the sixth gate valve 1361 to make the atmosphere 埠14 provides atmospheric pressure to the static pressure line 131.

The following is a description of the gas flow measurement system of the present invention, which can perform the first and second abnormality detection on the pressure gauge to verify whether the pressure gauge is normal.

When the gas flow measuring system of the present invention performs the first abnormality detecting, the controller 19 closes the first gate valve 1311 and the second gate valve 1321, thereby cutting off the communication between the static pressure port 11 and the static pressure line 131, and cutting The full pressure enthalpy 12 is disconnected from the full pressure line 132, and the static pressure and full pressure of the air flow that provides the measurement environment to the pressure gauge 15 is stopped. Next, the sixth gate valve 1361 of the atmospheric line 136 is opened, and the static pressure line 131 is communicated with the atmospheric enthalpy 14 so that the air pressure inside the static pressure line 131 conforms to atmospheric pressure, and the air pressure source 17 is opposite to the detection line 133. The gas is supplied until the air pressure value measured by the air pressure gauge 181 reaches a predetermined detection air pressure value, and the detection control module 18 can close the third gate valve 1331, thereby stopping the continuous supply of air to the detection pipeline 133 by the air pressure source 17 The air pressure inside the full pressure line 132 and the detection line 133 conforms to a predetermined detected air pressure, that is, the simulated gas pressure is input to the full pressure line 132 through the detection line 133. At this time, if the pressure difference between the full pressure line 132 and the static pressure line 131 measured by the pressure gauge 15 is equivalent to the predetermined detected air pressure, the measurement result representing the pressure gauge 15 is correct, and the function is normal. The state of use also represents that the full pressure line 132 and the static pressure line 131 are normally intact.

In the embodiment of the present invention, a flow reducer 1332 may be added to the detection line 133 to slow down the speed at which the air pressure source 17 supplies the gas to the detection line 133, in other words, to slow down the detection pressure of the detection line 133. The speed at which the predetermined value is reached. In this way, the speed at which the air pressure source 17 supplies the gas to the detection line 133 can be prevented from being too fast, and the detected air pressure of the detection line 133 exceeds a predetermined value, thereby affecting the result of the abnormality detection. Preferably, the flow damper 1332 is an adjustable damper that can adjust the degree of mitigation.

In addition, a check 埠 16 may be installed on the detection pipeline 133, which is located between the air pressure source 17 and the detection pipeline 133, and can check the full pressure pipeline 132 and the detection pipeline 133 when the first abnormality detection is performed. Whether the air pressure meets the expected condition, and the air pressure measurement result of the air pressure gauge 181 of the verification detection control module 18 can also verify whether the function of the air pressure gauge 181 is normal, and even check the full pressure pipeline 132 and the detection tube. Whether the road 133 is abnormal. Moreover, a pressure reducing valve 1333 may be added to the detecting line 133 between the air pressure source 17 and the detecting line 133 for reducing the air pressure provided by the air pressure source 17 for the detecting line 133 to meet The predetermined detected air pressure. Preferably, the pressure reducing valve 1333 is an adjustable pressure reducing valve capable of adjusting the degree of pressure detection.

The gas flow measuring system of the present invention further has a communication line 134 for connecting the static pressure line 131 and the full pressure line 132. The communication line 134 has a fourth gate valve 1341, and the controller 19 can make the fourth gate valve 1341. The static pressure line 131 is connected to the full pressure line 132. When the gas flow measuring system of the present invention performs the second abnormality detecting, the controller 19 closes the first gate valve 1311 and the second gate valve 1321, thereby cutting off the communication between the static pressure port 11 and the static pressure line 131, and cutting The full pressure enthalpy 12 is disconnected from the full pressure line 132, and the static pressure and full pressure of the air flow that provides the measurement environment to the pressure gauge 15 is stopped. Next, the controller 19 opens the sixth gate valve 1361 of the atmospheric line 136 and the fourth gate valve 1341 of the communication line 134, and connects the static pressure line 131 and the full pressure line 132 to the atmospheric enthalpy 14 to cause static pressure. The air pressure inside the pipeline 131 and the full pressure pipeline 132 is in accordance with atmospheric pressure. At this time, if the pressure difference between the full pressure pipeline 132 and the static pressure pipeline 131 measured by the pressure gauge 15 is equivalent to atmospheric pressure, it represents pressure. The pressure measurement function of the meter 15 is normal.

Therefore, the gas flow measuring system of the embodiment can input the simulated gas pressure to the pressure gauge through the control element in a timed and automatic manner on the line, and whether the pressure meter can correctly sense the input simulated gas pressure value. In order to judge whether the pressure gauge is abnormal, and to save the trouble of performing the inspection on the artificial site.

In the embodiment of the present invention, a cleaning line 135 as shown in FIG. 1 may be provided, which is in communication with the static pressure port 11, the full pressure port 12, and the air pressure source 17, respectively. The cleaning line 135 has a fifth gate valve 1351. The controller 19 can open the fifth gate valve 1351, so that the air pressure source 17 supplies the high pressure gas to the static pressure port 11 and the full pressure port 12 via the cleaning line 135 for cleaning. Specifically, when the static pressure 埠 11 and the full pressure 埠 12 are to be cleaned, the controller 19 closes the first gate valve 1311 and the second gate valve 1321, thereby cutting off the static pressure 埠 11 and the static pressure line 131. Connected, and disconnects the full pressure port 12 from the full pressure line 132. Next, the fifth gate valve 1351 on the cleaning line 135 is opened. Thus, the air pressure source 17 can supply the high pressure gas to the static pressure port 11 and the full pressure port 12 by the cleaning line 135, and the static pressure is cleaned by the high pressure gas. 11 with the full pressure 埠 12.

Second embodiment

Please refer to FIG. 3 , which is a schematic diagram of a second embodiment of the present creation gas flow measurement system. The main difference between the embodiment and the first embodiment is that a seventh gate valve 1322 is opened in the general pressure pipeline 132. The seventh gate valve 1322 is adjacent to the pressure gauge 15, and the pressure gauge 15 can be cut off. The communication of the full pressure line 132.

When the gas flow measurement system of the present invention performs the third abnormality detection, the controller 19 closes the second gate valve 1321 and the seventh gate valve 1322, thereby cutting off the full pressure enthalpy 12 and the pressure gauge 15 and the full pressure pipeline 132. Connected. Next, the air pressure source 17 is supplied with gas to the detection line 133 such that the air pressure inside the full pressure line 132 conforms to a predetermined detection air pressure, that is, the simulated air pressure is input to the full pressure line 132 through the detection line 133. At this time, if the air pressure inside the full pressure line 132 measured by the check 16 corresponds to the predetermined detection air pressure, it means that the full pressure line 132 is normal, and vice versa.

Therefore, the gas flow measuring system of the embodiment can input the simulated gas pressure for the full pressure pipeline, thereby determining whether the full pressure pipeline is abnormal, and contributing to the maintenance of the system by the engineering personnel.

In summary, the gas flow measurement system of the present invention can measure the flow rate of the airflow in the measurement environment of the pipeline, and the pressure difference between the static pressure and the full pressure of the ambient airflow can be obtained by the pressure gauge. The pressure difference can be used to estimate the flow of the airflow in the environment through the conversion formula with the flow rate. The gas flow measurement system of the present invention can also be automatically timed on the line, and the detection pressure is provided for the pressure gauge and the full pressure pipeline used for abnormality detection. What's more, high pressure gas can be supplied to the static pressure and full pressure for cleaning.

The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this creation should be as listed in the scope of patent application for this creation.

1‧‧‧Gas flow measurement system
11‧‧‧ Static pressure
111‧‧‧Static pressure gas collection port
12‧‧‧ Full pressure
121‧‧‧All pressure gas collection port
131‧‧‧Static pressure pipeline
1311‧‧‧First gate valve
132‧‧‧full pressure pipeline
1321‧‧‧Second gate valve
1322‧‧‧ seventh gate valve
133‧‧‧Test pipeline
1331‧‧‧3rd gate valve
1332‧‧‧Reflux
1333‧‧‧Reducing valve
134‧‧‧Connected pipeline
1341‧‧‧fourth gate valve
135‧‧‧clean pipeline
1351‧‧‧5th gate valve
136‧‧‧Atmospheric pipeline
1361‧‧‧6th gate valve
14‧‧‧ atmosphere
15‧‧‧ pressure gauge
16‧‧‧Checking
17‧‧‧Air pressure source
18‧‧‧Detection Control Module
181‧‧‧Barometer
19‧‧‧ Controller

Figure 1 is a block diagram of a first embodiment of the authored gas flow measurement system.

Figure 2 is a schematic diagram of static pressure and full pressure in the creation gas flow measurement system.

3 is a block diagram of a second embodiment of the present creation gas flow measurement system.

1‧‧‧Gas flow measurement system

11‧‧‧ Static pressure

12‧‧‧ Full pressure

131‧‧‧Static pressure pipeline

1311‧‧‧First gate valve

132‧‧‧full pressure pipeline

1321‧‧‧Second gate valve

133‧‧‧Test pipeline

1331‧‧‧3rd gate valve

1332‧‧‧Reflux

1333‧‧‧Reducing valve

134‧‧‧Connected pipeline

1341‧‧‧fourth gate valve

135‧‧‧clean pipeline

1351‧‧‧5th gate valve

136‧‧‧Atmospheric pipeline

1361‧‧‧6th gate valve

14‧‧‧ atmosphere

15‧‧‧ pressure gauge

16‧‧‧Checking

17‧‧‧Air pressure source

18‧‧‧Detection Control Module

181‧‧‧Barometer

19‧‧‧ Controller

Claims (10)

A gas flow measuring system has static pressure enthalpy, full pressure enthalpy and atmospheric enthalpy. The static pressure enthalpy and full pressure enthalpy are used to respectively receive the static pressure and the full pressure of the airflow of the measuring environment, and also have a static pressure tube. The road and the full pressure pipeline are respectively connected to the static pressure 埠 and the full pressure 埠, and a pressure gauge is used for measuring the air pressure connecting the static pressure pipeline and the full pressure pipeline, and the measurement environment airflow is obtained. The pressure difference between the pressure and the full pressure, and then the flow rate of the gas flow in the measurement environment is estimated by the conversion formula of the pressure difference and the flow rate, and further includes: the detection pipeline is connected to the full pressure pipeline; the air pressure source is Providing gas to the detection pipeline; the detection control module has a barometer for measuring the air pressure in the detection pipeline; and a controller for cutting the static pressure when performing the first abnormality detection Connecting the static pressure pipeline, and disconnecting the full pressure enthalpy from the full pressure pipeline, and connecting the static pressure pipeline to the atmosphere to make the air pressure inside the static pressure pipeline conform to atmospheric pressure And let the air pressure source supply gas to the detection pipeline, when the gas Metering measured pressure values detected pressure reaches a predetermined value, enabling the detection of the line pressure supply source is stopped in order to make the pressure inside the pipeline in line with the total pressure detection pressure. The gas flow measuring system according to claim 1, further comprising a communication line, wherein the controller is configured to cut off the connection between the static pressure and the static pressure pipeline when performing the second abnormality detection, And disconnecting the full pressure port from the full pressure line, and connecting the static pressure line and the full pressure line to the atmosphere to make the static pressure line and the whole The pressure inside the pressure line is in accordance with atmospheric pressure. The gas flow measuring system according to claim 1, wherein the controller is configured to cut off the connection between the full pressure and the pressure gauge and the full pressure pipeline when the third abnormality detection is performed, and the air pressure is obtained. The source supplies gas to the detecting pipeline, and when the air pressure measured by the air pressure reaches a predetermined detected air pressure value, the air pressure source stops supplying air to the detecting pipeline to make the air pressure inside the full pressure pipeline conform to the Check the air pressure. The gas flow measuring system of claim 1, further comprising a flow damper located between the air pressure source and the detecting pipeline for slowing the detection air pressure of the detecting pipeline to reach a predetermined value . The gas flow measurement system of claim 4, wherein the flow reducer is an adjustable flow reducer. The gas flow measuring system according to claim 1, wherein the detecting pipeline further has a check 埠, and when the abnormality detecting is performed, it is checked whether the air pressure of the full-pressure pipeline meets an expectation. The gas flow measuring system of claim 1, further comprising a pressure reducing valve disposed between the air pressure source and the detecting line for reducing the air pressure provided by the air pressure source to the detecting pipeline, In order to meet the predetermined detection pressure. The gas flow measuring system according to claim 1, further comprising a cleaning pipeline, wherein the air pressure source can also supply high pressure gas to the cleaning pipeline, the controller is connected to the static pressure and the full pressure When cleaning, the communication between the static pressure and the static pressure line is cut off, and the communication between the full pressure and the full pressure line is cut off, and the cleaning line is followed by the static pressure The pressure is connected to provide a high pressure gas to the static pressure and the full pressure, and the static pressure and the total pressure are cleaned. The gas flow measuring system according to claim 1, wherein the pressure gauge is a differential pressure gauge. The gas flow measuring system according to claim 1, wherein the static pressure enthalpy has a static pressure gas collecting port parallel to the flow direction of the ambient gas flow; the full pressure enthalpy has a full pressure gas collecting port, and the environment is vertical The flow of airflow.