CN114046833A - Method and device for measuring steam flow based on vortex shedding flowmeter - Google Patents

Method and device for measuring steam flow based on vortex shedding flowmeter Download PDF

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Publication number
CN114046833A
CN114046833A CN202111152533.8A CN202111152533A CN114046833A CN 114046833 A CN114046833 A CN 114046833A CN 202111152533 A CN202111152533 A CN 202111152533A CN 114046833 A CN114046833 A CN 114046833A
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China
Prior art keywords
steam
user
value
flow
instantaneous
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谢良
罗为栋
夏三元
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Huaneng Suzhou Thermal Power Co ltd
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Huaneng Suzhou Thermal Power Co ltd
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Priority to CN202111152533.8A priority Critical patent/CN114046833A/en
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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
    • G01F1/05—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 mechanical effects
    • G01F1/20—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 mechanical effects by detection of dynamic effects of the flow
    • G01F1/32—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 mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements

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  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention discloses a method and a device for measuring steam flow based on a vortex shedding flowmeter, which are applied to a power plant comprising a steam supply pipeline, wherein the steam supply pipeline is provided with a thermal resistor and the vortex shedding flowmeter, and the method comprises the following steps: acquiring a steam drum temperature value in a user steam distributing cylinder, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time; determining a steam using state of a user according to a temperature difference value between the steam drum temperature value and the steam temperature value; determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status; the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow. Thereby ensuring that the steam flow used by the user is metered below the lower measurable limit of the vortex shedding flowmeter.

Description

Method and device for measuring steam flow based on vortex shedding flowmeter
Technical Field
The application relates to the technical field of steam flow measurement, in particular to a method and a device for measuring steam flow based on a vortex shedding flowmeter.
Background
Steam is an important secondary energy source for petrochemical enterprises, and steam is required to be heated or used as power for enterprise users. In the industry, a vortex flowmeter is generally adopted to measure steam, the mass flow rate of the steam is usually measured, the mass flow rate is related to the density of the steam, the density of the steam is directly influenced by the pressure and the temperature of the steam, and the steam flow rate is changed along with the continuous change of the pressure and the temperature in the steam measuring process.
In the prior art, a steam flow metering system consisting of a vortex shedding flowmeter, a pressure sensor, a temperature sensor and a flow integrating instrument is widely used. But the problem that the actual small flow cannot be accurately measured due to the fact that the steam flow is lower than the measurable lower limit of the vortex shedding flowmeter when part of users use too small steam or the steam drum main valve is not completely closed when the steam is used is solved. This may result in failure to meter the steam flow used by the enterprise user, which may cause several times of deviation, thereby affecting the payment settlement of the fee.
Therefore, how to ensure that the steam flow used by the user is measured when the measurable lower limit of the vortex shedding flowmeter is lower is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a steam flow metering method based on a vortex shedding flowmeter, which is applied to a power plant comprising a steam supply pipeline, wherein the steam supply pipeline is provided with a thermal resistor and the vortex shedding flowmeter and is used for solving the technical problem that the steam flow used by a user cannot be metered when the lower measurable limit of the vortex shedding flowmeter is lower in the prior art, and the method comprises the following steps:
acquiring a steam drum temperature value in a user steam distributing cylinder, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time;
determining a steam using state of a user according to a temperature difference value between the steam drum temperature value and the steam temperature value;
determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status;
the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow.
Preferably, the steam using state of the user is determined according to the temperature difference between the steam drum temperature value and the steam temperature value, specifically:
if the temperature difference value is smaller than a preset temperature value in the flow totalizer, determining that the user is in a steam using state;
and if the temperature difference value is larger than a preset gas stopping temperature value in the flow integrating instrument, determining that the user is in a non-steam using state.
Preferably, the steam flow used by the user is determined based on the instantaneous flow value and the steam usage state of the user, specifically:
if the user is in a non-steam-using state and the instantaneous flow value is greater than or equal to zero, the steam flow is not measured;
and if the user is in a steam using state, determining the steam flow used by the user according to the instantaneous flow value and the flow value set by the user.
Preferably, if the user is in a steam using state, determining the steam flow used by the user according to the instant flow value and the flow value set by the user, specifically:
if the instantaneous flow value is larger than the user-set large flow value, determining the steam flow used by the user according to the double accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set large flow value and larger than the user-set small flow value, the steam flow used by the user is determined according to the accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value;
and if the instantaneous flow value is equal to zero, cumulatively determining the steam flow used by the user according to the small flow value set by the user.
Preferably, after the valve is closed by the user, when the valve is closed for more than a preset time and the valve is determined to be in a non-steam-using state, the steam flow metering is stopped.
Correspondingly, the invention also provides a steam flow metering device based on the vortex shedding flowmeter, which comprises:
the acquisition module is used for acquiring a steam drum temperature value in a steam distributing cylinder of a user, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time;
the first determining module is used for determining the steam using state of a user according to the temperature difference value between the steam drum temperature value and the steam temperature value;
a second determination module for determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status;
the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow.
Preferably, the first determining module is specifically configured to:
if the temperature difference value is smaller than a preset temperature value in the flow totalizer, determining that the user is in a steam using state;
and if the temperature difference value is larger than a preset gas stopping temperature value in the flow integrating instrument, determining that the user is in a non-steam using state.
Preferably, the second determining module is specifically configured to:
if the user is in a non-steam-using state and the instantaneous flow value is greater than or equal to zero, the steam flow is not measured;
and if the user is in a steam using state, determining the steam flow used by the user according to the instantaneous flow value and the flow value set by the user.
Preferably, the apparatus further comprises an accumulation module for:
if the instantaneous flow value is larger than the user-set large flow value, determining the steam flow used by the user according to the double accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set large flow value and larger than the user-set small flow value, the steam flow used by the user is determined according to the accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value;
and if the instantaneous flow value is equal to zero, cumulatively determining the steam flow used by the user according to the small flow value set by the user.
Preferably, after the valve is closed by the user, when the valve is closed for more than a preset time and the valve is determined to be in a non-steam-using state, the steam flow metering is stopped.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a method and a device for measuring steam flow based on a vortex shedding flowmeter, which are applied to a power plant comprising a steam supply pipeline, wherein the steam supply pipeline is provided with a thermal resistor and the vortex shedding flowmeter, and the method comprises the following steps: acquiring a steam drum temperature value in a user steam distributing cylinder, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time; determining a steam using state of a user according to a temperature difference value between the steam drum temperature value and the steam temperature value; determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status; the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow. Thereby ensuring that the steam flow used by the user is metered below the lower measurable limit of the vortex shedding flowmeter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a steam flow metering method based on a vortex shedding flowmeter according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram illustrating a steam flow metering method based on a vortex shedding flowmeter according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a steam flow metering device based on a vortex shedding flowmeter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
As described in the background art, in the prior art, when the flow rate of the steam used by a user is lower than the measurable lower limit of the vortex street flowmeter, the steam flow rate cannot be measured, and the collection and settlement of the cost are affected.
In order to solve the above problems, an embodiment of the present application provides a method and an apparatus for measuring a steam flow based on a vortex shedding flowmeter, which are applied to a power plant including a steam supply pipeline, where the steam supply pipeline is provided with a thermal resistor and the vortex shedding flowmeter, and the method includes: acquiring a steam drum temperature value in a user steam distributing cylinder, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time; determining a steam using state of a user according to a temperature difference value between the steam drum temperature value and the steam temperature value; determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status; the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow. Thereby ensuring that the steam flow used by the user is metered below the lower measurable limit of the vortex shedding flowmeter.
Fig. 1 is a schematic flow chart of a steam flow metering method based on a vortex shedding flowmeter according to an embodiment of the present invention, and the method includes:
s101, acquiring a steam drum temperature value in a steam-distributing cylinder of a user, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time.
Specifically, as shown in fig. 2, a schematic structural diagram of a steam flow measurement method based on a vortex flowmeter is shown, a thermal resistor and the vortex flowmeter are arranged in a steam supply pipeline, a pressure measuring hole and a temperature measuring hole are arranged at the rear end of the vortex flowmeter, the vortex flowmeter is used for measuring steam, the common mass flow of the steam is measured, the mass flow is related to the density of the steam, and the density of the steam is directly influenced by the pressure and the temperature of the steam. The method comprises the steps that a steam pocket temperature measuring point is arranged in a user steam distributing cylinder, a steam pocket temperature value of the steam pocket temperature measuring point is measured through a thermal resistor, an instantaneous flow value of steam in a steam supply pipeline is detected through a vortex shedding flowmeter, the temperature of a metering medium of the vortex shedding flowmeter, namely the steam temperature value, is detected, the obtained steam pocket temperature value, the obtained steam temperature value and the obtained instantaneous flow value are transmitted to a flow integrating instrument, and the flow integrating instrument carries out metering integration. And determining whether the user uses steam according to the steam drum temperature value, and determining the steam flow used by the user according to the instantaneous flow value and the steam using state of the user.
S102, determining a steam using state of a user according to a temperature difference value between the steam drum temperature value and the steam temperature value.
Specifically, the steam using state of the user is determined according to the temperature difference between the detected steam drum temperature value and the steam temperature value,
in order to accurately judge whether the user is in the steam using state, in a preferred embodiment of the present scheme, the steam using state of the user is determined according to a temperature difference between the steam drum temperature value and the steam temperature value, specifically:
if the temperature difference value is smaller than a preset temperature value in the flow totalizer, determining that the user is in a steam using state;
and if the temperature difference value is larger than a preset gas stopping temperature value in the flow integrating instrument, determining that the user is in a non-steam using state.
Specifically, if the temperature difference value is smaller than a preset temperature value in the flow totalizer, it is determined that the user is in a steam using state, and at the moment, a main valve of a steam inlet drum is in an incompletely closed state or a completely opened state; and if the temperature difference value is larger than a preset gas stopping temperature value in the flow integrating instrument, determining that the user is in a non-steam using state. The user is determined to be in a gas cut-off state, at which time the drum inlet main valve is completely closed.
S103, determining the steam flow used by the user based on the instantaneous flow value and the steam using state of the user.
Specifically, the steam flow used by the user is determined according to the detected instantaneous flow value and the steam using state of the user.
In order to accurately determine the steam flow used by the user, in a preferred embodiment of the present disclosure, the steam flow used by the user is determined based on the instantaneous flow value and the steam usage state of the user, specifically:
if the user is in a non-steam-using state and the instantaneous flow value is greater than or equal to zero, the steam flow is not measured;
and if the user is in a steam using state, determining the steam flow used by the user according to the instantaneous flow value and the flow value set by the user.
Specifically, if the user is in a steam-unused state and the instantaneous flow value is greater than or equal to zero, the steam flow measurement is not performed at this time because the user does not use steam at this time, so that the steam flow is not integrated even if the instantaneous flow value is detected to be greater than zero, no cost is generated on the part of the user at this time, and if the user is in a steam-used state, the steam flow used by the user is determined according to the instantaneous flow value and the flow value set by the user.
In order to integrate the steam flow used by the user when the measurable lower limit of the vortex shedding flowmeter is lower, in a preferred embodiment of the scheme, if the user is in a steam using state, the steam flow used by the user is determined according to the instant flow value and the flow value set by the user, specifically:
if the instantaneous flow value is larger than the user-set large flow value, determining the steam flow used by the user according to the double accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set large flow value and larger than the user-set small flow value, the steam flow used by the user is determined according to the accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value;
and if the instantaneous flow value is equal to zero, cumulatively determining the steam flow used by the user according to the small flow value set by the user.
Specifically, when the steam using state of the user is determined, the steam flow used by the user is calculated in an accumulated mode, finally the total steam mass used by the user is obtained, if the detected instantaneous steam flow value is larger than a large flow value set by the user, the steam flow used by the user is determined in an accumulated mode according to twice of the instantaneous flow value, and if the instantaneous flow value is smaller than the large flow value set by the user and larger than a small flow value set by the user, the steam flow used by the user is determined in an accumulated mode according to the instantaneous flow value. The vortex street flowmeter can accurately measure the instantaneous flow value under the two conditions, so that the steam flow used by a user is accumulated according to the instantaneous flow value to obtain the total usage. If the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value; if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the fact that the user does not completely close the steam inlet drum main valve indicates that the steam flow is in a small flow state, and the steam flow used by the user is accumulated according to the user-set small flow value. If the instantaneous flow value is equal to zero, accumulating and determining the steam flow used by the user according to the small flow value set by the user, wherein the steam used by the user is lower than the measurable lower limit of the vortex shedding flowmeter at the moment because the user is in a steam using state, so that the actual small flow cannot be measured, but the steam used by the user is accumulated and accumulated according to the small flow value set by the user at the moment. When the vortex shedding flowmeter cannot measure the small-flow steam, no method is available for measuring the steam amount used by a user, the cost cannot be generated, and the scheme can be effectively avoided. In this way, the user can be regulated to completely close the steam inlet drum main valve when the steam is not used, so that the user can be ensured to stop using the steam.
In order to avoid metering disputes, in a preferred embodiment of the present disclosure, after the user finishes closing the valve with steam, when the time is longer than a preset time and it is determined that the user is in a steam-unused state, the steam flow metering is stopped.
Specifically, because the valve is closed after the user uses the steam, the temperature cooling has a certain time lag after the valve is closed, metering dispute is avoided, the delay time can be set in the controller, the time is larger than the value, and the flow integrating instrument stops the flow integrating when the user is determined to be in the non-steam state. The delay time term is equal to the turn-off delay time when it is set to 0.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
The method comprises the steps that a steam pocket temperature measuring point is arranged in a user steam distributing cylinder, a steam pocket temperature value of the steam pocket temperature measuring point is measured through a thermal resistor, an instantaneous flow value of steam in a steam supply pipeline is detected through a vortex shedding flowmeter, the obtained steam pocket temperature value, the instantaneous flow value and the steam temperature value are transmitted to a flow integrating instrument according to the temperature of the steam corresponding to the instantaneous flow value of the steam measured by the vortex shedding flowmeter, and the flow integrating instrument carries out measurement integration.
Determining whether a user uses steam or not according to a temperature difference value between the steam drum temperature value and the steam temperature value, and determining that the user is in a steam using state if the temperature difference value is smaller than a preset temperature value in a flow integrating instrument, wherein a main valve of a steam inlet drum is in an incompletely closed state or a completely opened state at the moment; and if the temperature difference value is greater than the set air-stop temperature value in the flow integrating instrument, determining that the user is in an air-stop state, and completely closing the main valve of the steam inlet drum at the moment. If the user is in a steam-unused state and the instantaneous flow value is greater than or equal to zero, steam flow measurement is not carried out at this time, because the user does not use steam at this time, the steam flow is not integrated even if the instantaneous flow value is detected to be greater than zero, if the user is in a steam-used state, the steam flow used by the user is determined according to the instantaneous flow value and the flow value set by the user, and even if a steam inlet drum main valve is not completely closed, the steam flow is integrated according to a small flow set value even if the flow meter does not detect the flow.
When the steam using state of the user is determined, the steam flow used by the user is calculated in an accumulated mode, finally the total steam mass used by the user is obtained, if the detected steam instantaneous flow value is larger than a large flow value set by the user, the steam flow used by the user is determined according to the double accumulation of the instantaneous flow value, and if the instantaneous flow value is smaller than the large flow value set by the user and larger than a small flow value set by the user, the steam flow used by the user is determined according to the instantaneous flow value in an accumulated mode. The vortex street flowmeter can accurately measure the instantaneous flow value under the two conditions, so that the steam flow used by a user is accumulated according to the instantaneous flow value to obtain the total usage. If the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value; if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the fact that the user does not completely close the steam inlet drum main valve indicates that the steam flow is in a small flow state, and the steam flow used by the user is accumulated according to the user-set small flow value. If the instantaneous flow value is equal to zero, accumulating and determining the steam flow used by the user according to the small flow value set by the user, wherein the steam used by the user is lower than the measurable lower limit of the vortex shedding flowmeter at the moment because the user is in a steam using state, so that the actual small flow cannot be measured, but the steam used by the user is accumulated and accumulated according to the small flow value set by the user at the moment. When the vortex shedding flowmeter cannot measure the small-flow steam, no method is available for measuring the steam amount used by a user, the cost cannot be generated, and the scheme can be effectively avoided. In this way, the user can be regulated to completely close the steam inlet drum main valve when the steam is not used, so that the user can be ensured to stop using the steam.
In order to achieve the above technical object, an embodiment of the present application further provides a steam flow metering device based on a vortex shedding flowmeter, as shown in fig. 3, the device includes:
the acquisition module is used for acquiring a steam drum temperature value in a steam distributing cylinder of a user, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time;
the first determining module is used for determining the steam using state of a user according to the temperature difference value between the steam drum temperature value and the steam temperature value;
a second determination module for determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status;
the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow.
In a specific application scenario, the first determining module is specifically configured to:
if the temperature difference value is smaller than a preset temperature value in the flow totalizer, determining that the user is in a steam using state;
and if the temperature difference value is larger than a preset gas stopping temperature value in the flow integrating instrument, determining that the user is in a non-steam using state.
In a specific application scenario, the second determining module is specifically configured to:
if the user is in a non-steam-using state and the instantaneous flow value is greater than or equal to zero, the steam flow is not measured;
and if the user is in a steam using state, determining the steam flow used by the user according to the instantaneous flow value and the flow value set by the user.
In a specific application scenario, the apparatus further includes an accumulation module, configured to:
if the instantaneous flow value is larger than the user-set large flow value, determining the steam flow used by the user according to the double accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set large flow value and larger than the user-set small flow value, the steam flow used by the user is determined according to the accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value;
and if the instantaneous flow value is equal to zero, cumulatively determining the steam flow used by the user according to the small flow value set by the user.
In a specific application scenario, after the user finishes closing the valve with steam, when the preset time is longer and the user determines that the steam is in a non-steam-using state, the steam flow metering is stopped.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. A steam flow metering method based on a vortex shedding flowmeter is applied to a power plant comprising a steam supply pipeline, and is characterized in that the steam supply pipeline is provided with a thermal resistor and the vortex shedding flowmeter, and the method comprises the following steps:
acquiring a steam drum temperature value in a user steam distributing cylinder, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time;
determining a steam using state of a user according to a temperature difference value between the steam drum temperature value and the steam temperature value;
determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status;
the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow.
2. The method according to claim 1, wherein the determination of the user steam usage status is based on the temperature difference between the drum temperature value and the steam temperature value, in particular:
if the temperature difference value is smaller than a preset temperature value in the flow totalizer, determining that the user is in a steam using state;
and if the temperature difference value is larger than a preset gas stopping temperature value in the flow integrating instrument, determining that the user is in a non-steam using state.
3. The method according to claim 1, characterized in that the steam flow used by the user is determined based on the instantaneous flow value and the user steam usage status, in particular:
if the user is in a non-steam-using state and the instantaneous flow value is greater than or equal to zero, the steam flow is not measured;
and if the user is in a steam using state, determining the steam flow used by the user according to the instantaneous flow value and the flow value set by the user.
4. The method according to claim 3, wherein if the user is in a steam using state, determining the steam flow used by the user according to the magnitude of the instantaneous flow value and the user-set flow value, specifically:
if the instantaneous flow value is larger than the user-set large flow value, determining the steam flow used by the user according to the double accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set large flow value and larger than the user-set small flow value, the steam flow used by the user is determined according to the accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value;
and if the instantaneous flow value is equal to zero, cumulatively determining the steam flow used by the user according to the small flow value set by the user.
5. The method of claim 1, wherein the metering of the steam flow is stopped when a valve closing is completed by the user and a non-steam-using state is determined for more than a preset time.
6. The utility model provides a steam flow metering device based on vortex flowmeter, is applied to in the power plant including steam supply steam pipe way, its characterized in that, steam supply steam pipe way is equipped with thermal resistance and vortex flowmeter, the device includes:
the acquisition module is used for acquiring a steam drum temperature value in a steam distributing cylinder of a user, an instantaneous steam flow value and a steam temperature value in a steam supply pipeline in real time;
the first determining module is used for determining the steam using state of a user according to the temperature difference value between the steam drum temperature value and the steam temperature value;
a second determination module for determining a steam flow used by the user based on the instantaneous flow value and the user steam usage status;
the thermal resistor is used for measuring the steam drum temperature value, and the steam temperature value is the temperature of steam when the vortex shedding flowmeter measures the instantaneous steam flow.
7. The apparatus of claim 6, wherein the first determining module is specifically configured to:
if the temperature difference value is smaller than a preset temperature value in the flow totalizer, determining that the user is in a steam using state;
and if the temperature difference value is larger than a preset gas stopping temperature value in the flow integrating instrument, determining that the user is in a non-steam using state.
8. The apparatus of claim 6, wherein the second determining module is specifically configured to:
if the user is in a non-steam-using state and the instantaneous flow value is greater than or equal to zero, the steam flow is not measured;
and if the user is in a steam using state, determining the steam flow used by the user according to the instantaneous flow value and the flow value set by the user.
9. The apparatus of claim 8, wherein the apparatus further comprises an accumulation module to:
if the instantaneous flow value is larger than the user-set large flow value, determining the steam flow used by the user according to the double accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set large flow value and larger than the user-set small flow value, the steam flow used by the user is determined according to the accumulation of the instantaneous flow value;
if the instantaneous flow value is smaller than the user-set small flow value and larger than zero, the steam flow used by the user is determined according to the accumulation of the user-set small flow value;
and if the instantaneous flow value is equal to zero, cumulatively determining the steam flow used by the user according to the small flow value set by the user.
10. The apparatus of claim 6, wherein the steam flow metering is stopped when a predetermined time is exceeded after the valve is closed by the user and it is determined that the steam is not used.
CN202111152533.8A 2021-09-29 2021-09-29 Method and device for measuring steam flow based on vortex shedding flowmeter Pending CN114046833A (en)

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