CN218822527U - Back pressure type steam turbine exhaust flow measuring device - Google Patents
Back pressure type steam turbine exhaust flow measuring device Download PDFInfo
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- CN218822527U CN218822527U CN202223003448.8U CN202223003448U CN218822527U CN 218822527 U CN218822527 U CN 218822527U CN 202223003448 U CN202223003448 U CN 202223003448U CN 218822527 U CN218822527 U CN 218822527U
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Abstract
The utility model provides a back pressure turbine exhaust steam flow measuring device, which comprises a water medium conveying pipeline; the atomizing spray head is arranged at the water outlet end of the water medium conveying pipeline; the measuring component is at least arranged on the water medium conveying pipeline to measure the water supply pressure and the water supply temperature; the device is arranged on the steam turbine exhaust pipeline and close to the side of the cylinder so as to measure the exhaust pressure and the exhaust temperature; and the pressure and the temperature are measured after the exhaust steam is mixed with the aqueous medium. The utility model discloses turn into the flow measurement of pressure, temperature measurement with the flow measurement of pipeline steam and add liquid water, because the measurement accuracy of liquid discharge is high, and the measurement accuracy of pressure, temperature can accomplish to be higher than the measurement accuracy of liquid discharge, and consequently the measurement accuracy after the synthesis will be higher than the precision of direct measurement steam flow, and then improves the measurement accuracy of steam flow.
Description
Technical Field
The utility model relates to a back pressure steam turbine exhaust flow measurement technical field particularly, relates to a back pressure steam turbine exhaust flow measurement device.
Background
The back pressure turbine exhaust steam pipeline is big in size, high in parameter, and flow measurement is difficult, and because steam is compressible fluid, direct measurement's precision itself is not high yet.
Although non-contact flowmeters such as ultrasonic wave and the like are convenient to measure, the measurement precision is poor in engineering practice; the measurement accuracy of the nozzle flowmeter is relatively high, but in actual operation, the steam exhaust pipeline may need to be cut, assembled, welded and insulated, and the operation is complex.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.
Therefore, the utility model provides a back pressure steam turbine exhaust flow measuring device.
The utility model provides a back pressure turbine steam extraction flow measuring device, include:
one end of the water medium conveying pipeline is a water inlet end, and the other end of the water medium conveying pipeline is communicated with a steam turbine exhaust pipeline to form a water outlet end;
the atomizing spray head is arranged at the water outlet end of the water medium conveying pipeline so as to atomize the water medium in the water medium conveying pipeline and spray the atomized water medium into the steam turbine exhaust pipeline;
the measuring component is at least arranged on the water medium conveying pipeline to measure the water supply pressure and the water supply temperature; the device is arranged on the steam turbine exhaust pipeline and close to the side of the cylinder so as to measure the exhaust pressure and the exhaust temperature; and the pressure and the temperature are measured after the exhaust steam is mixed with the aqueous medium.
It should be noted that the principle of the technical solution is as follows:
the water medium is conveyed to the steam exhaust pipeline of the steam turbine through a water medium conveying pipeline, and the measuring components are respectively arranged on the water medium conveying pipeline so as to measure the water supply pressure and the water supply temperature; the device is arranged on the steam turbine exhaust pipeline and close to the side of the cylinder so as to measure the exhaust pressure and the exhaust temperature; and the pressure and the temperature are measured after the exhaust steam is mixed with the aqueous medium.
Specifically, after the pipeline for conveying the aqueous medium is stable, the steam exhaust pressure P1, the steam exhaust temperature T1, the water supply pressure P2, the water supply temperature T2, the pressure P3 after the steam exhaust is mixed with the aqueous medium and the temperature T3 after the steam exhaust is mixed with the aqueous medium in the time period T are recorded, and the average parameter in the time period T is calculated
Simultaneously recording the total water spraying amount G2 of the pipeline for conveying the aqueous medium in the time period t;
according to average steam parameter
And (3) checking the steam property to obtain corresponding steam enthalpy values H1, H2 and H3, wherein the total exhaust steam flow G1 in the time period t is as follows:
the exhaust steam flow g1 is as follows:
according to the utility model discloses above-mentioned technical scheme's back pressure steam turbine steam extraction flow measuring device can also have following additional technical characteristics:
in the technical scheme, the measuring component arranged on the steam turbine exhaust pipeline and close to the cylinder side forms a first measuring area, two first measuring points are arranged in the first measuring area, and the measuring component respectively measures the exhaust pressure and the exhaust temperature at the two first measuring points.
In the above technical solution, a distance between the two first measurement points is not less than 2D, where D is an inner diameter of the exhaust duct of the steam turbine.
In the above technical solution, no turbulent flow structure is disposed upstream of the first measurement region and within a range of a distance of 5D, where the turbulent flow structure includes, but is not limited to, an elbow and a valve.
In the technical scheme, the distance between the atomizing nozzle and a first measuring point for measuring the exhaust steam temperature is not less than 5D, and D is the inner diameter of the exhaust pipeline of the steam turbine.
In the technical scheme, a second measurement area is formed by the measurement component arranged on the pipeline for conveying the aqueous medium, two second measurement points are arranged in the second measurement area, and the measurement component respectively measures the water supply pressure and the water supply temperature at the two second measurement points.
In the technical scheme, a third measurement area is formed by a measurement component which is arranged on the steam turbine exhaust pipeline and is positioned on the downstream of the atomizing nozzle, two third measurement points are arranged in the third measurement area, and the measurement component respectively measures the pressure and the temperature of the mixed exhaust steam and the aqueous medium at the two third measurement points.
In the technical scheme, the distance between the third measuring point for measuring the pressure after the exhaust steam is mixed with the aqueous medium and the atomizing nozzle is not less than 5D, and the distance between the two third measuring points is not less than 2D, wherein D is the inner diameter of the exhaust pipeline of the steam turbine.
In the above technical scheme, the water medium conveying pipeline is composed of a water supply pipeline and a water spray pipeline, the water supply pipeline is communicated with the water spray pipeline, and the atomizing nozzle is arranged at the water outlet end of the water spray pipeline.
In the technical scheme, a water pump is arranged on the water supply pipeline, and a stop valve and a flowmeter are arranged on the water spray pipeline.
The utility model provides a back pressure steam turbine exhaust steam flow measuring device compares with prior art, has following beneficial effect:
the utility model discloses turn into the flow measurement of pressure, temperature measurement with pipeline steam and add the flow measurement of liquid water, because the measurement accuracy of liquid water flow is high, and the measurement accuracy of pressure, temperature can accomplish to be higher than the measurement accuracy of liquid water flow, therefore the measurement accuracy after the synthesis will be higher than the precision of direct measurement steam flow, and then improve the measurement accuracy of steam flow.
The utility model adds a water side flowmeter in the water spraying pipeline, compared with a steam flowmeter on a steam exhaust pipeline, the volume flow measured by the water side flowmeter is much smaller, and the medium temperature is also low, so the water side flowmeter has small volume and low installation difficulty; the material requirement is not high, the price is low, and the cost is saved.
The utility model discloses need not cut whole exhaust steam pipe during installation, only need local processing can.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a back pressure turbine exhaust flow measuring device according to an embodiment of the present invention.
Wherein, the corresponding relationship between the reference numbers and the component names in fig. 1 is as follows:
1. a back pressure turbine; 2. a steam turbine exhaust conduit; 3. an atomizing spray head; 4. a water pump; 5. a water supply line; 6. a water spray pipeline; 7. a flow meter; 8. and a stop valve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A back pressure turbine exhaust flow measurement device provided in accordance with some embodiments of the present invention is described below with reference to fig. 1.
Some embodiments of the present application provide a back pressure turbine exhaust flow measurement device.
As shown in fig. 1, the embodiment of the utility model provides a back of body back pressure formula steam turbine steam extraction flow measuring device, include: one end of the water medium conveying pipeline is a water inlet end, and the other end of the water medium conveying pipeline is communicated with the steam turbine exhaust pipeline 2 to form a water outlet end; wherein, the water medium conveying pipeline consists of a water supply pipeline 5 and a water spraying pipeline 6 which are communicated with each other;
wherein the water supply line 5 is equipped with a water pump 4 for supplying an aqueous medium to the water spray line 6. The water spray line 6 is equipped with a flow meter 7 and a shut-off valve 8. Wherein the flow meter 7 is used to measure the total water injection amount of the water injection pipeline 6 in a certain time, i.e. G2 (in the t period). The shut-off valve 8 is then used to open or close the water spray line 6.
The atomizing nozzle 3 is arranged at the water outlet end of the water medium conveying pipeline so as to atomize the water medium in the water medium conveying pipeline and spray the water medium into the steam turbine exhaust pipeline 2;
the atomizing nozzle 3 is located in the turbine exhaust duct, and is used for atomizing the aqueous medium in the water spraying pipeline 6 and spraying the aqueous medium into the turbine exhaust duct, so that the steam and the aqueous medium are mixed sufficiently.
The measuring component is at least arranged on the water medium conveying pipeline to measure the water supply pressure and the water supply temperature; the device is arranged on the steam turbine exhaust pipeline 2 and close to the side of the cylinder so as to measure the exhaust pressure and the exhaust temperature; and the pressure and the temperature are measured after the exhaust steam and the aqueous medium are mixed by the pressure and the temperature which are arranged on the exhaust steam pipeline 2 of the steam turbine and are positioned at the downstream of the atomizing nozzle 3.
Wherein each set of measuring components may be constituted by a pressure gauge and a temperature sensor. The area where the measuring component is arranged is a measuring area, and the positions where the pressure gauge and the temperature sensor are arranged are measuring points. Three sets of measuring zones can thus be formed, in each case two measuring points, namely a pressure measuring point and a temperature measuring point, being formed in each set of measuring zones.
The first measurement area is arranged at the position of the steam turbine exhaust pipeline 2 close to the cylinder side, the pressure gauge in the first measurement area measures the exhaust pressure at a pressure measurement point, namely P1 (in a T period), and the temperature sensor measures the exhaust temperature at a temperature measurement point, namely T1 (in the T period);
a second measuring area is arranged on a water supply pipeline 5 in the pipeline for conveying the aqueous medium, a pressure gauge in the second measuring area measures the water supply pressure at a pressure measuring point, namely P2 (within a T period), and a temperature sensor measures the water supply temperature at a temperature measuring point, namely T2 (within the T period);
the third measurement area is arranged at the steam turbine exhaust pipeline 2 and is positioned at the downstream of the atomizing nozzle 3, the pressure gauge in the third measurement area measures the pressure of the mixed exhaust steam and the water medium at a pressure measurement point, namely P3 (within the T period), and the temperature sensor measures the temperature of the mixed exhaust steam and the water medium at a temperature measurement point, namely T3 (within the T period).
Therefore, by combining the principle of the technical scheme, the exhaust steam flow g1 is finally obtained.
Specifically, the stop valve 8 is opened, and water is sprayed into the steam turbine exhaust pipeline 2 through the water spraying pipeline 6;
after the water spraying system is stable, recording steam parameters P1, T1, P2, T2, P3 and T3 in the time period T, and calculating average steam parameters in the time period T
At the same time, the total water injection quantity in the t time period is recorded through the 7-flow meterG2；
According to average steam parameter
And (3) checking the steam property to obtain corresponding steam enthalpy values H1, H2 and H3, wherein the total exhaust steam flow G1 in the time period t is as follows:
the exhaust steam flow g1 is as follows:
in addition, in order to ensure the measurement accuracy, the selection of the position of the measurement point is recommended to follow the following principle:
1) A straight pipe section of the steam exhaust pipeline is selected to be provided with a measuring point, and is preferably a horizontal straight pipe section;
2) No turbulent flow structures such as elbows, valves and the like are arranged in the upstream 5D (D is the inner diameter of the steam exhaust pipeline) range of the pressure measurement point P1 of the first measurement area;
3) The distance between the temperature measuring point T1 and the pressure measuring point P1 of the first measuring area is not less than 2D;
4) The distance between the atomizing nozzle and the temperature measuring point T1 of the first measuring area is not less than 5D;
5) The distance between a pressure measuring point P3 of the third measuring area and the atomizing spray head is not less than 5D;
6) The distance between the temperature measuring point T3 and the pressure measuring point P3 of the third measuring area is not less than 2D;
7) In pressure measurement point P1 to temperature measurement point T3's pipeline section within range, except the measurement point, must not have vortex structures such as other measurement points, valves.
In addition to the above principle, the technical proposal also suggests
Comparatively>
The height is 2-3 ℃, so that the calculation precision can be ensured, and the consumed water spraying amount is less; it is recommended that the measurement time t is greater than 30 minutes to improve the measurement accuracy.
It should be noted that, for most back pressure turbines, the exhaust pipe is originally provided with pressure and temperature measuring points, a water spraying device and the like, so that if adjustment can be made according to the technical scheme or the exhaust pipe is arranged according to the technical scheme during initial design, the exhaust flow can be conveniently measured, and the back pressure turbine is a simple and practical engineering measuring device;
because the pressure and temperature enthalpy checking value is used in the measuring process, the device is only suitable for superheated steam, and is not suitable for wet steam, saturated steam and low-superheat-degree (the superheat degree is less than 25 ℃) steam.
In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a back pressure steam turbine steam discharge flow measuring device which characterized in that includes:
one end of the water medium conveying pipeline is a water inlet end, and the other end of the water medium conveying pipeline is communicated with a steam turbine exhaust pipeline to form a water outlet end;
the atomizing spray head is arranged at the water outlet end of the water medium conveying pipeline so as to atomize the water medium in the water medium conveying pipeline and spray the water medium into the steam turbine exhaust pipeline;
the measuring component is at least arranged on the water medium conveying pipeline to measure the water supply pressure and the water supply temperature; the device is arranged on the steam turbine exhaust pipeline and close to the side of the cylinder so as to measure the exhaust pressure and the exhaust temperature; and the pressure and the temperature are measured after the exhaust steam is mixed with the aqueous medium.
2. The back pressure turbine exhaust flow measurement device according to claim 1, wherein a measurement assembly disposed in the turbine exhaust conduit near the cylinder side forms a first measurement zone having two first measurement points therein, the measurement assembly measuring exhaust pressure and exhaust temperature at the two first measurement points, respectively.
3. The back pressure turbine exhaust flow measurement device according to claim 2, wherein a distance between two of the first measurement points is not less than 2D, where D is an inner diameter of a turbine exhaust duct.
4. The back pressure turbine exhaust flow measurement device of claim 3,
the upper reaches of first measuring area and the distance do not set up the vortex structure for 5D's within range, wherein, the vortex structure includes but not limited to elbow, valve.
5. The back pressure turbine exhaust flow measurement device according to claim 4, wherein a distance between the atomizer head and a first measurement point for measuring the exhaust temperature is not less than 5D, D being an inner diameter of the turbine exhaust duct.
6. The back pressure turbine exhaust steam flow measuring device according to claim 5, wherein the measuring unit provided in the delivery aqueous medium line forms a second measuring region having two second measuring points therein, and the measuring unit measures the supply water pressure and the supply water temperature at the two second measuring points, respectively.
7. The back pressure turbine exhaust flow measuring device according to claim 6, wherein a measuring component disposed in the turbine exhaust duct downstream of the atomizer head forms a third measuring region, the third measuring region having two third measuring points therein, the measuring component measuring the pressure and temperature of the exhaust mixed with the aqueous medium at the two third measuring points, respectively.
8. The back pressure turbine exhaust flow measuring device according to claim 7, wherein a distance between the third measuring point for measuring the pressure after mixing of exhaust steam and an aqueous medium and the atomizer is not less than 5D, and a distance between two third measuring points is not less than 2D, where D is an inner diameter of a turbine exhaust duct.
9. The back pressure turbine exhaust steam flow measuring device according to any one of claims 1 to 8, wherein the delivery water medium pipe is composed of a water supply pipe and a water spray pipe, the water supply pipe and the water spray pipe are communicated, and the atomizing nozzle is arranged at a water outlet end of the water spray pipe.
10. The back pressure turbine exhaust flow measuring device according to claim 9, wherein a water pump is provided on the water supply line, and a stop valve and a flow meter are provided on the water spray line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223003448.8U CN218822527U (en) | 2022-11-11 | 2022-11-11 | Back pressure type steam turbine exhaust flow measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223003448.8U CN218822527U (en) | 2022-11-11 | 2022-11-11 | Back pressure type steam turbine exhaust flow measuring device |
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| Publication Number | Publication Date |
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| CN218822527U true CN218822527U (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223003448.8U Active CN218822527U (en) | 2022-11-11 | 2022-11-11 | Back pressure type steam turbine exhaust flow measuring device |
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| CN (1) | CN218822527U (en) |
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- 2022-11-11 CN CN202223003448.8U patent/CN218822527U/en active Active
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