KR101702960B1 - the pressure control device and the pressure control method using thereof - Google Patents
the pressure control device and the pressure control method using thereof Download PDFInfo
- Publication number
- KR101702960B1 KR101702960B1 KR1020150153673A KR20150153673A KR101702960B1 KR 101702960 B1 KR101702960 B1 KR 101702960B1 KR 1020150153673 A KR1020150153673 A KR 1020150153673A KR 20150153673 A KR20150153673 A KR 20150153673A KR 101702960 B1 KR101702960 B1 KR 101702960B1
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- South Korea
- Prior art keywords
- pressure
- flow rate
- energy
- mass flow
- measuring
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Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/86—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure
- G01F1/88—Indirect mass flowmeters, e.g. measuring volume flow and density, temperature or pressure with differential-pressure measurement to determine the volume flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
Abstract
The present invention relates to a pressure control method and a pressure controller capable of pressure control in a conventional mass flowmeter, and relates to a pressure controller and a pressure control method capable of energy display capable of simultaneously viewing pressure control and flow (mass, volume, energy) will be.
The present invention includes a flow rate measuring apparatus 200, a pressure control apparatus 100, an integrated processing apparatus 300, a display unit 400, a temperature measuring sensor 500, and a pressure measuring sensor 600, A pressure controller is provided for controlling a pressure through a valve signal while simultaneously measuring a flow rate and an energy amount.
The pressure control device 100 according to the present invention includes a pressure control unit 110, a control pressure sensor 120, a valve actuator 130, and a control valve 140 in a pipe 10 through which a fluid flows However,
The integrated processing apparatus 300 includes the enthalpy database 320, the density database 330, and / or the static pressure specific heat (Cp) And a pressure controller for measuring the flow rate and the energy amount at the same time.
Further, the present invention is characterized in that the above-mentioned flow rate measuring apparatus 200 is a differential pressure type mass flow rate flow rate measuring apparatus, a thermal type mass flow rate flow rate measuring apparatus or a Coriolis mass flow rate flow rate measuring apparatus, And a pressure controller for measuring the flow rate and the energy amount simultaneously.
Also, the present invention is characterized in that the type of the gas, the temperature (T) of the gas, the pressure (P)
(Step 2) of measuring the mass flow rate by the flow rate measuring apparatus 200,
The mass flow rate is measured and then the energy is measured (step 3)
(Step 4) of controlling the pressure flowing through the pipe by the pressure control device 100, and controlling the pressure set by the user through the valve signal while simultaneously controlling the flow rate (mass flow rate and / or volume flow rate) A pressure control method in which an amount of energy is measured is provided.
Description
The present invention relates to a pressure control method and a pressure controller capable of pressure control in a conventional mass flowmeter, and relates to a pressure controller and a pressure control method capable of energy display capable of simultaneously viewing pressure control and flow rate (mass, volume, energy) will be.
The prior art controls only the pressure produced by equipment such as a compressor. This is due to the fact that pressure is used to stabilize the process only by the concept of pressure without knowing the direct energy consumption for energy saving and energy utilization.
In addition, the conventional pressure controller has a disadvantage of being less than 25 mm as a pressure regulator, inconvenient for manual setting, and having a high cost burden due to import.
As a prior art related to the above-mentioned prior art, 10-2011-0056543 (mass flow controller using a pressure gauge of a thermal type flow sensor) is described in "a mass flow controller thermal sensor identification system, comprising two or more temperature sensing elements, A thermal mass flow sensor adapted to generate a first signal that varies with a temperature difference between the pair of sensing elements, a pressure mass flow sensor suitable for generating a second signal that varies with a change in pressure, Wherein the digital controller receives the first signal, receives the second signal, uses the first signal to calculate a first mass flow rate of material flowing through the mass flow controller, Using the second signal to calculate a second mass flow rate of material flowing through the mass flow controller, and using the first mass flow rate as the second mass The mass flow controller is configured to compare the flow rate with the flow rate and to verify successful operation of the thermal mass flow rate sensor.
The above prior art and prior art control only the pressure produced by equipment such as a compressor. This is because there is a problem that energy is saved due to pressure and energy consumption is not known, and the process is stabilized only by the concept of pressure The invention seeks to provide a pressure controller and pressure control method capable of displaying energy (mass flow rate and / or volume flow rate) and indicating energy that can be verified for the ultimate energy savings and usage due to pressure control
The present invention also provides a pressure controller of the present technology in a pressure line of a production equipment such as a compressor and provides a constant pressure to an industrial process and simultaneously displays a flow rate indication (mass flow rate and / or volume flow rate) A pressure controller and a pressure control method capable of providing accurate energy usage information to a user.
The present invention also relates to a flow rate indication (mass flow rate and / or volume flow rate) for solving the situation requiring a high level of accuracy in the pressure control and energy measurement, A pressure controller and a pressure control method capable of providing accurate energy usage information to a user by displaying energy amount.
In order to solve the above problems and needs,
The pressure set by the user including the flow rate measuring
The
The integrated
Further, the present invention is characterized in that the flow rate measuring apparatus (200) is a differential pressure type mass flow rate flow rate measuring apparatus, a thermal type mass flow rate flow rate measuring apparatus or a Coriolis mass flow rate flow rate measuring apparatus And a pressure controller for measuring the flow rate and the energy amount simultaneously.
Also, the present invention is characterized in that the type of the gas, the temperature (T) of the gas, the pressure (P)
(Step 2) of measuring the mass flow rate by the flow
The mass flow rate is measured and then the energy is measured (step 3)
(Step 4) of controlling the pressure flowing through the pipe by the
In the pressure controller and the pressure control method capable of energy display according to the present invention, the prior art and the prior art control only the pressure produced in equipment such as a compressor, (Mass flow rate and / or volumetric flow rate), which can confirm the ultimate energy saving and usage amount by pressure control, can be solved completely, Effect appears.
Also, in the conventional pressure controller and pressure control method, it has been confirmed in the field that the energy saving of the production equipment such as the compressor can be realized only by the existing pressure control. However, since there is no information about the flow rate change, The pressure controller and the pressure control method according to the present invention can confirm the mass and the amount of energy at the same time as the pressure control. Therefore, it is possible to switch the energy to the pipe without using a separate conversion device, A large contribution is shown.
Further, the pressure controller and the pressure control method according to the present invention require a high level of accuracy in the pressure control and energy measurement due to the situation in which the need for an industrial plant for energy saving is increased and the flow rate indication And / or volumetric flow rate) and the amount of energy, it is possible to provide accurate energy usage information to the user.
1 shows a conventional pressure controller;
2 is a structural schematic view of a pressure controller capable of energy display according to the present invention.
FIG. 2B is a conceptual diagram of an integrated processing apparatus of a pressure controller capable of energy display according to the present invention. FIG.
FIG. 3 is a pressure controller capable of energy display using the differential pressure type mass flow meter flow measurement device according to the present invention. FIG.
3B is a pressure controller capable of energy display using a thermal mass flow meter flow measuring apparatus according to the present invention.
3C is a pressure controller capable of energy display using a Coriolis mass flow meter measurement device according to the present invention.
4 is an enthalpy database (matrix) of gas (methane) to be measured in an embodiment of the present invention.
Figure 4b is a database (matrix) of the density p of the gas of methane with temperature and pressure according to an embodiment of the present invention.
4C is a static specific heat database (matrix) of gas (methane) to be measured in an embodiment of the present invention.
5 is a flow chart of a pressure control method capable of energy display according to the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The present invention relates to a pressure controller and a pressure controller for controlling a flow rate (mass flow rate and / or volume flow rate) and an energy amount while controlling a pressure set by a user through a valve signal while a pressure controller is installed at a rear end or a front end of the flow meter, Method.
1, the conventional
When the
The
The above-mentioned
The
The above-mentioned
The above-mentioned
As shown in FIG. 2, the present invention provides a pressure controller capable of energy display including a flow
In addition, the flow
It is a technical feature of the present invention that, unlike the conventional pressure controller, the function of measuring the accurate flow rate (mass flow rate and / or volume flow rate) can be performed.
The flow
The technical feature of the present invention is that energy measurement can be made very easy by using the mass flow rate measured by the
The integrated
The integrated
The above-described
The
The integrated
The
The temperature measuring
Accordingly, the
The
The above-mentioned
Accordingly, the
The technical feature of the present invention is that the enthalpy (H) of the gas is directly obtained by the temperature (T) transmitted from the temperature measuring sensor, the pressure (P) provided by the pressure measuring sensor and the flow rate provided by the flow measuring device It is the point where the amount of energy can be measured.
As described above, the technical feature of the present invention is that the user preliminarily constructs a density, static specific heat and / or enthalpy for a specific temperature and pressure of a gas in a database in a matrix format, and determines a specific temperature and pressure A specific pressure or specific enthalpy of static pressure can be easily selected from the database or inputted or computed easily using this database to provide a pressure controller that displays flow and energy amounts that do not require complex computation .
In the present invention, the mass flow rate is measured by the flow
In the present invention, the enthalpy at a specific temperature and pressure of a specific gas to be measured is measured, and the gas energy to be measured can be obtained by multiplying the measured flow rate by the enthalpy.
That is, the energy formula is E = Qm x H (Equation 1)
Where E is energy (kJ / s)
Qm is the mass flow rate (kg / s)
H is the enthalpy (kJ / kg).
Therefore, the unit of E becomes kJ / s.
Therefore, the present invention preliminarily determines the enthalpy (H) according to the temperature (T) and pressure (P) of the specific gas to be measured and constructs the
As shown in FIG. 4B, the
As shown in FIG. 4C, the present invention includes a step of constructing a specific heat (Cp) of static pressure of gas according to a temperature (T) and a pressure (P) of a specific gas to be measured in a database, )
As shown in FIG. 4, the enthalpy (H) according to the temperature (T) and the pressure (P) of a specific gas (gas) is obtained in advance and stored in a database.
The enthalpy H is selected and input in the
The technical feature of the present invention resides in that, when there is no specific heat of static pressure consistent with a certain temperature and pressure in the above enthalpy database, the temperature and pressure close to the specific temperature and pressure are searched for, And the enthalpy corresponding to the specific temperature and pressure can be obtained.
The process of obtaining the enthalpy corresponding to the specific temperature and pressure using interpolation, extrapolation, or the like is performed as follows.
The above interpolation is based on the fact that the shape of the function f (x) of the real variable x is unknown, but the value xi (i) of two or more variables having an interval (irregular interval or irregular interval) = 1, 2, ..., n) is known, it is necessary to estimate a function value for any x between the function values f (xi). It is used when estimating a value from an observed value obtained by an experiment or an observation or obtaining a function value not in the table by a function table such as a log table. The simplest method is to obtain the function value to be obtained by concatenating the points of the variable with the x coordinate and the known function value of the variable with the y coordinate.
Also, by using the expansion of the function, an expression that approximates the function f (x) in the vicinity of the variables x0 and x1,
(x-x0)} / (x1-x0)] (x-x0)
.
This is a simple formula, called a proportional part or linear interpolation. Since x0 and x1 are set to be sufficiently small, as in the logarithmic or trigonometric function table, the linear interpolation is used. Newton's interpolation formula can be used for more rigorous calculations.
The method of finding the approximate value of f (x) for any x outside of x1 and xn in response to the interpolation is called the extrapolation method or the extrapolation method.
The present invention transmits the enthalpy (H) selected above to the
That is, the energy formula, E = Qm x H ----- (Equation 1)
To calculate the energy.
The energy amount calculated in the above process is transmitted to the
In the present invention, the process of obtaining the volume flow rate Qv using the mass flow rate Qm transmitted from the flow rate measuring device may be performed.
The formula for obtaining the volume flow (Qv) is as follows.
(Qv) = Qm / ρ [
Here, ρ is the density of the specific gas to be measured as density [kg / m 3 ], and the density according to the specific temperature and pressure is input from the
3 is a block diagram of a flow
As shown in FIG. 3, the pressure gauge
Therefore, in the conventional differential pressure type
In the differential pressure type
Therefore, in the differential pressure type mass flowmeter flow
As shown in FIG. 3B, the thermal
The conventional thermal
The
Mass flow rate Qm = [heat amount W / static specific heat Cp 占 temperature difference? T]
The thermal
As shown in FIG. 3C, the
The above-mentioned conventional Coriolis mass flow meter refers to a mass flow meter using the Coriolis effect, which is a mechanical effect caused by the rotational inertia force (Coriolis force) received by an object moving in a rotational coordinate system.
As shown in FIG. 3C, the conventional Coriolis mass flowmeter is configured such that the
In the present invention, the mass flow rate is measured using a flow
The present invention also provides a pressure control method capable of energy display according to the structure and the method as described above.
That is, in the present invention, the type of the gas, the temperature (T) of the gas, the pressure (P), and the like are measured and input for the measurement is performed (step 1).
The mass flow rate is measured by the flow rate measuring device 200 (step 2).
The mass flow rate is measured and the energy amount is measured (step 3).
The process of setting the
In the present invention, enthalpy (H) is selected and input in the enthalpy database according to the inputted gas type, temperature (T), and pressure (P) (step 3-1).
The energy amount is calculated by substituting the enthalpy (H) inputted above and the mass flow rate (Qm) calculated in the above into the following energy calculation formula (step 3-2).
That is, the energy formula is E = Qm x H (Equation 1)
Where E is energy (kJ / s)
Qm is the mass flow rate (kg / s)
H is the enthalpy (kJ / kg).
Therefore, the unit of E becomes kJ / s.
A process of controlling the pressure of the pipe by the
The present invention provides a pressure control method for controlling the flow rate (mass flow rate and / or volume flow rate) and energy amount while controlling the pressure set by the user through the valve signal by the above-described process.
A pressure controller and a pressure control method for controlling a mass flow rate, a volume flow rate, and / or an energy amount while controlling a pressure set by a user made up of the structure and function of the present invention through a valve signal.
INDUSTRIAL APPLICABILITY The present invention is an extremely useful invention for an industry that produces, sells, and provides a device for measuring the flow rate of a gas.
In particular, the present invention is also very useful in industries related to a pressure control device or a pressure control device for controlling the pressure set by the user through the valve signal and measuring the amount of energy while measuring the flow rate of the gas.
The
A
The
The
An
A
Claims (4)
The pressure control apparatus 100 includes a pressure control unit 110, a control pressure sensor 120, a valve actuator 130, and a control valve 140 in a pipe 10 through which a fluid flows,
The integrated processing apparatus 300 includes the enthalpy database 320, the density database 330, and / or the static pressure specific heat (H) which are constructed by preliminarily obtaining enthalpy (H) according to the temperature (T) (Cp) database 340,
The mass flow rate Qm measured by the flow rate measuring device 200,
The energy is measured by the enthalpy H input according to the type of gas, the temperature T and the pressure P input from the enthalpy database 320 of the integrated processing apparatus,
[The energy formula is E = Qm x H
Where E is energy (kJ / s)
Qm is the mass flow rate (kg / s)
H is enthalpy (kJ / kg)]
A pressure controller configured to control the pressure set by the user through the valve signal while simultaneously measuring the flow rate and energy amount of the gas.
The flow meter 200 is a differential pressure type mass flow meter flow meter, a thermal mass flow meter flow meter, or a Coriolis mass flow meter flow meter. The pressure of the user is controlled through a valve signal, And a pressure controller for measuring a flow rate and an energy amount of the fluid.
A process of measuring the mass flow rate by the flow rate measuring device 200 (step 2)
The mass flow rate is measured and then the energy is measured (step 3)
The enthalpy (H) in accordance with the temperature (T) and the pressure (P) of the gas to be measured is obtained in advance and the enthalpy (H ) Is selected and input (step 3-1),
The energy amount is calculated by substituting the enthalpy H inputted in the above and the mass flow rate Qm measured by the flow rate measuring device 200 into the following energy calculation formula (step 3-2)
[The energy formula is E = Qm x H,
Where E is energy (kJ / s)
Qm is the mass flow rate (kg / s)
H is enthalpy (kJ / kg)]
(4) controlling the pressure of the gas flowing through the pipe by the pressure control device (100), wherein the flow rate and the energy amount of the gas are measured while controlling the pressure set by the user through the valve signal.
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| KR1020150153673A KR101702960B1 (en) | 2015-11-03 | 2015-11-03 | the pressure control device and the pressure control method using thereof |
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| KR1020150153673A KR101702960B1 (en) | 2015-11-03 | 2015-11-03 | the pressure control device and the pressure control method using thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3540381A1 (en) | 2018-03-16 | 2019-09-18 | Siemens Aktiengesellschaft | Flow measurement in valves with thermal correction |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012026930A (en) * | 2010-07-26 | 2012-02-09 | Omron Corp | Structure for flow rate measurement and flow rate measuring equipment |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012026930A (en) * | 2010-07-26 | 2012-02-09 | Omron Corp | Structure for flow rate measurement and flow rate measuring equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3540381A1 (en) | 2018-03-16 | 2019-09-18 | Siemens Aktiengesellschaft | Flow measurement in valves with thermal correction |
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