CN218156321U - Long-diameter nozzle flowmeter - Google Patents
Long-diameter nozzle flowmeter Download PDFInfo
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- CN218156321U CN218156321U CN202222083482.4U CN202222083482U CN218156321U CN 218156321 U CN218156321 U CN 218156321U CN 202222083482 U CN202222083482 U CN 202222083482U CN 218156321 U CN218156321 U CN 218156321U
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Abstract
The application discloses major diameter nozzle flowmeter includes: the long-diameter nozzle is arranged between the upstream straight pipe section and the downstream straight pipe section of the pipeline and is connected with the upstream straight pipe section and the downstream straight pipe section in a welding mode; the two sets of flow differential pressure transmitters are connected through double pressure taking holes which are preset in the long-diameter nozzle and are used for converting the fluid pressure in the long-diameter nozzle into differential pressure signals and outputting the differential pressure signals; the throttling piece is an oblique cylinder, the front end of the throttling piece is arranged at the upstream of the long-diameter nozzle flow meter, the diameter of the front end of the throttling piece is the same as the inner diameter of the long-diameter nozzle, and the diameter of the rear end of the throttling piece is smaller than that of the front end of the throttling piece, so that fluid flowing through the long-diameter nozzle forms differential pressure in front of and behind the throttling piece.
Description
Technical Field
The application relates to the technical field of flowmeters, in particular to a long-diameter nozzle flowmeter.
Background
Because the steam turbine set in the boiler workshop has very high energy consumption of S9.8 steam per hour, in order to improve the management level of energy conservation and consumption reduction, the consumption of the steam turbine set needs to be measured and calculated, the operating temperature is 520-540 ℃, the operating pressure is 8.5-9.3MPa, and a high-precision and reliable measuring scheme is very necessary to be selected. The conventional differential pressure type flowmeter cannot realize the flow detection under the high-temperature and high-pressure special working condition.
SUMMERY OF THE UTILITY MODEL
The utility model provides a major diameter nozzle flowmeter has realized the statistics of steam turbine set steam quantity, has established the basis for promoting energy saving and consumption reduction management level. .
According to one aspect of the present application, there is provided a long diameter nozzle flow meter comprising: a long-diameter nozzle, two sets of symmetrical flow differential pressure transmitters arranged at the middle position outside the long-diameter nozzle, and a throttling piece arranged inside the long-diameter nozzle, wherein
The long-diameter nozzle is arranged between the upstream straight pipe section and the downstream straight pipe section of the pipeline and is connected in a welding mode;
the two sets of flow differential pressure transmitters are connected through double pressure taking holes which are preset in the long-diameter nozzle and are used for converting the fluid pressure in the long-diameter nozzle into differential pressure signals and outputting the differential pressure signals;
the throttling piece is an oblique cylinder, the front end of the throttling piece is arranged at the upstream of the long-diameter nozzle flow meter, the diameter of the front end of the throttling piece is the same as the inner diameter of the long-diameter nozzle, and the diameter of the rear end of the throttling piece is smaller than that of the front end of the throttling piece, so that fluid flowing through the long-diameter nozzle forms differential pressure in front of and behind the throttling piece.
Optionally, the long-diameter nozzle flow meter further comprises: and the thermal resistance thermometer is arranged at the rear side of the downstream straight pipe section and is arranged outside the pipeline and used for measuring the temperature of the fluid in the pipeline.
Optionally, the long-diameter nozzle flow meter further comprises: and the pressure transmitter is arranged at the rear side of the thermal resistance thermometer and outside the pipeline and is used for measuring the pressure of fluid in the pipeline.
Optionally, the long diameter nozzle has a length of 700mm, an outer diameter of 325mm and a wall thickness of 8mm.
Optionally, the orifice is 262mm in length and 180mm in diameter at the rear end.
Optionally, the upstream straight tube section has a length of greater than 1800mm and the downstream straight tube section has a length of greater than 900mm.
Optionally, the two sets of flow differential pressure transmitters are provided with sampling valves on pipes connected with the pressure sampling holes, and the sampling valves are used for opening or cutting off the pipe passages.
Optionally, a valve group is arranged between the sampling valve and the positive and negative chambers for balancing the pressure of the positive and negative chambers and avoiding unidirectional pressurization of the bellows.
This application chooses for use high temperature and high pressure resistant, measuring range is wide, the precision is high, long service life, the simple integral type major diameter nozzle flowmeter of installation requirement according to operating mode characteristics to be equipped with integration flow differential pressure transmitter. The long-neck nozzle is provided with two pairs of pressure taking holes and is provided with a double differential pressure flow transmitter, so that the monitoring reliability is improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic diagram of a long diameter nozzle flow meter according to an embodiment of the present application.
The device comprises a long-diameter nozzle 1, a flow differential pressure transmitter 2, a throttling element 3, an upstream straight pipe section 4, a downstream straight pipe section 5, a thermal resistance thermometer 6, a pressure transmitter 7, a sampling valve 8, a valve bank 9, a positive chamber 10, a negative chamber 10, a diaphragm capsule 11 and a pressure tapping hole 12.
Detailed Description
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing embodiments of the invention herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Fig. 1 is a schematic view of a long diameter nozzle flow meter according to an embodiment of the present application, and referring to fig. 1, the long diameter nozzle flow meter includes: the long-diameter nozzle is arranged between an upstream straight pipe section and a downstream straight pipe section of the pipeline and is connected by a welding mode; the two sets of flow differential pressure transmitters are connected through double pressure taking holes which are preset in the long-diameter nozzle and are used for converting the fluid pressure in the long-diameter nozzle into differential pressure signals and outputting the differential pressure signals; the throttling piece is an oblique cylinder, the front end of the throttling piece is arranged at the upstream of the long-diameter nozzle flow meter, the diameter of the front end of the throttling piece is the same as the inner diameter of the long-diameter nozzle, and the diameter of the rear end of the throttling piece is smaller than that of the front end of the throttling piece, so that fluid flowing through the long-diameter nozzle forms differential pressure in front of and behind the throttling piece.
The function of the flow differential pressure transmitter is as follows: the transmitter is divided into two chambers, when fluid pressure is respectively introduced into the two chambers through the pressure taking pipeline and the pressure is respectively introduced into the two chambers, the sensor generates displacement (or displacement trend) under the combined action of the two pressures, the displacement is in direct proportion to the pressure difference (differential pressure) of the two chambers, and the transmitter converts the displacement into a standard signal capable of reflecting the size of the differential pressure and outputs the standard signal.
The throttling element makes the flowing fluid partially contract at the position, differential pressure is formed before and after the throttling element, the larger the differential pressure is, the larger the flow rate is, and the flow rate is measured according to the differential pressure
Therefore, according to the working condition characteristics, the integral long-diameter nozzle flowmeter with high temperature resistance, high pressure resistance, wide measuring range, high precision, long service life and simple installation requirements is selected and used, and an integral flow differential pressure transmitter is matched. The long-neck nozzle is provided with two pairs of pressure taking holes and is provided with a double differential pressure flow transmitter, so that the monitoring reliability is improved.
The technology adopts a long-diameter nozzle with high temperature and high pressure resistance, impact resistance, wide measurement range and high precision to measure the steam flow of the steam turbine unit S9.8MPa.
Optionally, referring to fig. 1, the long-diameter nozzle flow meter further includes: and the thermal resistance thermometer is arranged on the rear side of the downstream straight pipe section and outside the pipeline and is used for measuring the temperature of the fluid in the pipeline. Thermal resistance thermometer function: the temperature of the pipeline fluid is measured, and the signal is sent to the DCS system to compensate the temperature of the fluid.
Optionally, referring to fig. 1, the long-diameter nozzle flow meter further includes: the pressure transmitter is arranged on the rear side of the thermal resistance thermometer and on the outer side of the pipeline and used for measuring the pressure of fluid in the pipeline. The pressure transmitter has the functions that: the pressure of the pipeline fluid is measured, and the signal is sent to the DCS system to compensate the pressure of the fluid.
And a thermal resistance thermometer and a pressure transmitter are arranged at the downstream of the flow meter, flow signals are transmitted to a DCS, secondary taking and operation are carried out on flow data of the two paths of flow differential pressure transmitters, and then temperature and pressure compensation operation is carried out on the flow data and the temperature and pressure signals, so that real-time steam flow is obtained.
Alternatively, as shown in FIG. 1, the long diameter nozzle has a length of 700mm, an outer diameter of 325mm and a wall thickness of 8mm.
Alternatively, and with reference to FIG. 1, the orifice member is 262mm in length and 180mm in diameter at the rear end.
Alternatively, as shown with reference to figure 1, the upstream straight tube section is greater than 1800mm in length and the downstream straight tube section is greater than 900mm in length.
Optionally, referring to fig. 1, two sets of flow differential pressure transmitters are provided with sampling valves on the pipes connected with the pressure tapping holes for opening or cutting off the pipe passages.
Optionally, referring to fig. 1, a valve set is disposed between the sampling valve and the positive and negative chambers for balancing the pressures of the positive and negative chambers and preventing the bellows from being pressurized in one direction.
In addition, 1 set of integrated long-diameter nozzle flow meter which is subjected to TS boiler detection is arranged in an air inlet S9.8MPa steam pipeline of the steam turbine, two pairs of pressure taking holes are arranged for improving reliability, a double-differential-pressure transmitter is configured, a standard signal is sent to a control room DCS, and two paths of flow data are subjected to secondary taking. The installation requirement of the long-diameter nozzle is as follows: 1) The straight tube section of upper reaches 6D at least, straight tube section of low reaches is not less than 3D, 2) adopts the pipeline welding formula to the high-temperature high-pressure steam operating mode. 3) The pressure taking ports are positioned at two ends of the horizontal diameter of the pipeline, 4) a temperature and pressure automatic compensation device is arranged, and 5) the height of the positive and negative pressure guide pipe or the height of the positive and negative condensate liquid is ensured to be equal in use in order to avoid additional measurement errors.
By adopting the integral long-diameter nozzle flowmeter which is high-temperature and high-pressure resistant, wide in measurement range, high in precision, long in service life and simple in installation requirement, the problem that steam flow under high-temperature and high-pressure working conditions is difficult to measure is solved, data statistics of steam consumption of a steam turbine set is realized, and a foundation is laid for improving the management level of energy conservation and consumption reduction.
Therefore, according to the working condition characteristics, the integral long-diameter nozzle flowmeter which is resistant to high temperature and high pressure, wide in measuring range, high in precision, long in service life and simple in installation requirement is selected and matched with the integral flow differential pressure transmitter, in order to improve the monitoring reliability, the long-neck nozzle is provided with two pairs of pressure taking holes, the double differential pressure transmitter is configured, the thermal resistance thermometer and the pressure transmitter are arranged at the downstream of the flowmeter, flow signals are sent to a DCS, and after two-way flow data are subjected to two-way taking operation, temperature and pressure compensation operation is carried out on the two-way flow data and the temperature and pressure signals, so that the real-time steam flow is obtained.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
For ease of description, spatially relative terms such as "over 8230," "upper surface," "above," and the like may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary terms "at 8230; \8230; 'above" may include both orientations "at 8230; \8230;' above 8230; 'at 8230;' below 8230;" above ". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A long diameter nozzle flow meter, comprising: the long-diameter nozzle, two sets of symmetrical flow differential pressure transmitters arranged at the middle position outside the long-diameter nozzle and a throttling piece arranged inside the long-diameter nozzle, wherein
The long-diameter nozzle is arranged between the upstream straight pipe section and the downstream straight pipe section of the pipeline and is connected in a welding mode;
the two sets of flow differential pressure transmitters are connected through double pressure taking holes which are preset in the long-diameter nozzle and are used for converting the fluid pressure in the long-diameter nozzle into differential pressure signals and outputting the differential pressure signals;
the throttling piece is an oblique cylinder, the front end of the throttling piece is arranged at the upstream of the long-diameter nozzle flow meter, the diameter of the front end of the throttling piece is the same as the inner diameter of the long-diameter nozzle, and the diameter of the rear end of the throttling piece is smaller than that of the front end of the throttling piece, so that fluid flowing through the long-diameter nozzle forms differential pressure in front of and behind the throttling piece.
2. The long diameter nozzle flow meter of claim 1, further comprising: and the thermal resistance thermometer is arranged on the rear side of the downstream straight pipe section and on the outer side of the pipeline and is used for measuring the temperature of the fluid in the pipeline.
3. The long diameter nozzle flow meter of claim 2, comprising: the pressure transmitter is arranged on the rear side of the thermal resistance thermometer and on the outer side of the pipeline and used for measuring the pressure of the fluid in the pipeline.
4. The long diameter nozzle flow meter of claim 1, wherein the long diameter nozzle has a length of 700mm, an outer diameter of 325mm and a wall thickness of 8mm.
5. A long diameter nozzle flow meter according to claim 1, wherein the orifice is 262mm in length and 180mm in diameter at the rear end.
6. A long diameter nozzle flow meter according to claim 1, wherein the length of the upstream straight tube section is greater than 1800mm and the length of the downstream straight tube section is greater than 900mm.
7. The long-diameter nozzle flowmeter as claimed in claim 1, wherein the two sets of flow differential pressure transmitters are provided with sampling valves on the pipes connected with the pressure sampling holes for opening or cutting off the pipe passages.
8. The long diameter nozzle flowmeter of claim 7, wherein a valve set is provided between the sampling valve and the positive and negative chambers for balancing the pressure of the positive and negative chambers and preventing the bellows from being pressurized in one direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222083482.4U CN218156321U (en) | 2022-08-09 | 2022-08-09 | Long-diameter nozzle flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222083482.4U CN218156321U (en) | 2022-08-09 | 2022-08-09 | Long-diameter nozzle flowmeter |
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| Publication Number | Publication Date |
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| CN218156321U true CN218156321U (en) | 2022-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222083482.4U Active CN218156321U (en) | 2022-08-09 | 2022-08-09 | Long-diameter nozzle flowmeter |
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