CN202583025U - Double-elbow-pipe steam dryness on-line measurement meter - Google Patents
Double-elbow-pipe steam dryness on-line measurement meter Download PDFInfo
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- CN202583025U CN202583025U CN 201220198289 CN201220198289U CN202583025U CN 202583025 U CN202583025 U CN 202583025U CN 201220198289 CN201220198289 CN 201220198289 CN 201220198289 U CN201220198289 U CN 201220198289U CN 202583025 U CN202583025 U CN 202583025U
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Abstract
The utility model discloses a double-elbow-pipe steam dryness on-line measurement meter and relates to the technical field of steam quality measurement. The double-elbow-pipe steam dryness on-line measurement meter comprises a steam sampling pipeline, a temperature transmitter, an elbow sensor, a differential pressure and pressure transmitter, a heater and an integrating controller. The steam sampling pipeline comprises an air inlet end and an air outlet end, the temperature transmitter, the differential pressure and pressure transmitter and the heater are all connected with the integrating controller and controlled through the integrating controller. The double-elbow-pipe steam dryness on-line measurement meter has the advantages of being good in stability, high in measurement accuracy, simple in structure, low in construction cost, simple in operation, capable of widely applying to engineering practice, high in dynamic response speed, capable of continuously displaying in real time, strong in recording function and small in maintenance quantity and the like, and the double-elbow-pipe steam dryness on-line measurement meter has significances on heat measurement of saturated steam and identification of steam quality and is wide in application and development prospects.
Description
[technical field]
The utility model relates to a kind of steam quality measurement device, and in particular, the utility model relates to a kind of twin elbow formula steam quality on-line measurement appearance.
[background technology]
Steam quality is the important parameter of wet steam, and it directly affects the accurate metering of steam flow and heat.Mass dryness fraction is the distinctive parameter of stream-liquid two-phase flow; It can not direct measurement as pressure and temperature; Though mass dryness fraction is very important in practical application, because the complicacy of stream-liquid two-phase flow and the phase transformation between the vapour-liquid cause the measurement of mass dryness fraction to become a difficult problem that never has fine solution in the world.At present, the method for dryness measurement has much both at home and abroad, mainly can be divided into three major types: assay method, non-thermodynamic method and thermodynamic method.
1, assay method
Assay method is from boiler inlet water and sampling respectively after boiler export steam steam-water separator separates, and confirms the changes of contents of the salt (calcium ions and magnesium ions) in inlet water and the outlet saturation water then with titrimetry, the mass dryness fraction of coming the integrating steam.The deficiency of this method is: (1) its unsuitable real-time measurement instrument device of processing according to this; (2) it can only be measured the mass dryness fraction of boiler, and the measurement of the mass dryness fraction in the steam course of conveying has but been lost effect.
2, nonthermal method
Nonthermal method mainly contains optical method, holographic method, electric method etc.; Because also there is bigger limitation in non-thermodynamic method in present practical applications, and problems such as the instrument ubiquity of this class methods manufacturing involves great expense, bad adaptability, precision is not high and serviceable life is undesirable.
3, thermodynamic method
Thermodynamic method mainly contains flow limit method, steam air mixing method, heating, phase separation method, coagulation etc.Wherein heating have measuring principle simple, receive steam parameter to be measured to influence the characteristics little, that measurement range is wide.But these methods all owing to different, are difficult to apply.
[utility model content]
The purpose of the utility model is effectively to overcome the deficiency of above-mentioned technology; A kind of good stability, measuring accuracy height, simple in structure cheap and simple to operate are provided, can be widely used in the twin elbow formula steam quality on-line measurement appearance in the engineering practice.
The technical scheme of the utility model is to realize like this; Its improvements are: it comprises steam sampling pipeline, temperature transmitter, Bending Tube Sensor, differential pressure and pressure unit, well heater and integrating controller; Said steam sampling pipeline comprises inlet end and outlet side, and said temperature transmitter, differential pressure and pressure unit and well heater all are connected to the integrating controller and control through the integrating controller; Said Bending Tube Sensor is provided with two, and wherein a Bending Tube Sensor is arranged at the position near the outlet side, and said well heater is located on the steam sampling pipeline in the middle of two Bending Tube Sensors; Said temperature transmitter is provided with two, and one of them is arranged on the steam sampling pipeline after the well heater, and another is arranged on the position near inlet end; Said differential pressure and pressure unit are provided with two, and all have a test side, and this test side is arranged on the Bending Tube Sensor; The main body of said integrating controller is a single-chip microcomputer, and what be connected with this single-chip microcomputer has PID output driver and a display;
In the said structure, the inlet end of said steam sampling pipeline and outlet side are provided with a needle valve, and on the needle valve of inlet end, are connected with a sampling pipe;
In the said structure, the also same keyboard of said single-chip microcomputer, USB interface and RS-232 interface connect;
In the said structure, be provided with heating element in the said well heater, and this heating element is spiral helicine heating tube;
In the said structure, the quality of steam that said inlet end gets into well heater is:
The quality of steam that well heater is flowed out in the outlet side is:
In above-mentioned two formulas, Q
mBe mass rate, Δ P
Go intoBe inlet Bending Tube Sensor differential pressure, X is a steam quality, Δ P
Go outBe outlet Bending Tube Sensor differential pressure, C is coefficient of flow=0.982 (R/2D) 1/2, and R is a Bending Tube Sensor bend pipe radius-of-curvature, and D is a Bending Tube Sensor bend pipe diameter, ρ
VapourBe saturated vapor density, ρ
WaterBe saturation water density; Is conservation according to flowing into well heater with the quality that flows out well heater steam, so
Q
M goes into=Q
M goes out
That is:
After the arrangement, can draw:
The beneficial effect of the utility model is: the utility model good stability, measuring accuracy height, simple in structure cheap and simple to operate; Can be widely used in the engineering practice, in addition, also have rapid dynamic response speed; Continuous real-time demonstration and writing function are strong; Advantages such as maintenance is little, significant with the discriminating quality of steam for the calorimetry of saturated vapour, application and development prospect are very wide.
[description of drawings]
Fig. 1 is the practical implementation illustration of the utility model;
Fig. 2 is the theory diagram of the utility model integrating controller.
[embodiment]
Below in conjunction with accompanying drawing and embodiment the utility model is done further to describe.
With reference to shown in Figure 1; The utility model has disclosed a kind of twin elbow formula steam quality on-line measurement appearance; This measuring instrument comprises steam sampling pipeline 1, temperature transmitter 2, Bending Tube Sensor 3, differential pressure and pressure unit 4, well heater 5 and integrating controller 6; Said temperature transmitter 2, differential pressure and pressure unit 4 and well heater 5 all are connected to integrating controller 6 and control through integrating controller 6; Steam sampling pipeline 1 comprises inlet end 101 and outlet side 102, and inlet end 101 is provided with a needle valve 103 with outlet side 102, and the needle valve 103 of inlet end 101 is connecting a sampling pipe 104; Bending Tube Sensor 3 is provided with two; Be connected on the steam sampling pipeline 1; The flow velocity signal of Bending Tube Sensor 3 of being used for flowing through converts differential pressure signal into, and wherein a Bending Tube Sensor 3 is arranged on the position near outlet side 101, and well heater 5 is arranged between two Bending Tube Sensors; Be provided with spiral helicine heating tube 501 in the well heater, be used for the steam of steam sampling pipeline 1 is heated; Temperature transmitter 2 is provided with two; One of them is arranged on the steam sampling pipeline 1 after the well heater 5; The position that another is arranged near inlet end 101 is used for the temperature information of steam in the steam sampling pipeline 1 is converted into the current signal of 4-20mA standard and is sent to integrating controller 6; Said differential pressure and pressure unit 4 are provided with two; And all has a test side 401; This test side 401 is arranged on the Bending Tube Sensor 3; Be used for the differential pressure signal after Bending Tube Sensor 3 conversions is converted to the current signal of 4-20mA standard and is sent to integrating controller 6, and the pressure information of steam in the steam sampling pipeline 1 is converted to the current signal of 4-20mA standard and is sent to integrating controller 6; With reference to shown in Figure 2, the main body of integrating controller 6 is a single-chip microcomputer 601, and this single-chip microcomputer connects has PID output driver 602, display 603, keyboard 604, USB interface 605 and RS-232 interface 606.
At first make the saturation water vaporization after wet saturated steam is heated, all could continue the rising temperature after the vaporization, become dry saturated steam when sucking the latent heat of vaporization.Wet saturated steam in the sampling pipe 104; Flow in the well heater 5 through sampling pipe 104, needle valve 103, Bending Tube Sensor 3; Carry out the heating of isobaric isothermal, wet steam absorbs heat to be vaporized moisture in the wet steam to change the dry steam of equitemperature into fully, and this process is the thermal value by integrating controller 6 control heaters 5; Along with the heater outlet flow velocity of wet saturated steam constantly increases; When saturation water is vaporized into dry steam fully, well heater 5 will keep certain thermal value to make system reach mobile equilibrium, and will be accurately stable for what guarantee to measure; The needle valve 103 of regulating inlet end 101 earlier makes sampling flow reach appropriate value; Outlet temperature is just equaled or a little more than saturation temperature (being temperature in), at this moment steam has been converted into dry steam fully, flow out through Bending Tube Sensor 3, temperature transmitter 2, needle valve 103 then.Because the differential pressure that Bending Tube Sensor 3 produces is to speed and mass-sensitive; So measure differential pressure signal, the temperature and pressure value of Bending Tube Sensor 3 simultaneously at well heater 5 entrance and exit places, the compensation operation through integrating controller 6 obtains mass dryness fraction value accurately then.
According to conservation of matter principle, the gross mass that when mobile equilibrium, flows into the saturated wet steam of well heater necessarily equals to heat the gross mass that the well heater dry saturated steam is flowed out in the back, can wait until following equality thus:
The quality of steam that gets into well heater is:
The quality of steam that well heater is flowed out in the outlet side is:
In above-mentioned two formulas, Q
mBe mass rate, Δ P
Go intoBe inlet Bending Tube Sensor differential pressure, X is a steam quality, Δ P
Go outBe outlet Bending Tube Sensor differential pressure, C is coefficient of flow=0.982 (R/2D) 1/2, and R is a Bending Tube Sensor bend pipe radius-of-curvature, and D is a Bending Tube Sensor bend pipe diameter, ρ
VapourBe saturated vapor density, ρ
WaterBe saturation water density; Is conservation according to flowing into well heater with the quality that flows out well heater steam, so
Q
M goes into=Q
M goes out
That is:
After the arrangement, can draw:
Can realize the measurement of steam quality thus.
The preferred embodiment that is merely the utility model described above, above-mentioned specific embodiment are not the restrictions to the utility model.In the technological thought category of the utility model, various distortion and modification can appear, and the retouching that all those of ordinary skill in the art make according to above description, revise or be equal to replacement, all belong to the scope that the utility model is protected.
Claims (5)
1. twin elbow formula steam quality on-line measurement appearance; It is characterized in that: it comprises steam sampling pipeline, temperature transmitter, Bending Tube Sensor, differential pressure and pressure unit, well heater and integrating controller; Said steam sampling pipeline comprises inlet end and outlet side, and said temperature transmitter, differential pressure and pressure unit and well heater all are connected to the integrating controller and control through the integrating controller;
Said Bending Tube Sensor is provided with two, and wherein a Bending Tube Sensor is arranged at the position near the outlet side, and said well heater is located on the steam sampling pipeline in the middle of two Bending Tube Sensors;
Said temperature transmitter is provided with two, and one of them is arranged on the steam sampling pipeline after the well heater, and another is arranged on the position near inlet end;
Said differential pressure and pressure unit are provided with two, and all have a test side, and this test side is arranged on the Bending Tube Sensor;
The main body of said integrating controller is a single-chip microcomputer, and what be connected with this single-chip microcomputer has PID output driver and a display.
2. twin elbow formula steam quality on-line measurement appearance according to claim 1, it is characterized in that: the inlet end of said steam sampling pipeline and outlet side are provided with a needle valve, and on the needle valve of inlet end, are connected with a sampling pipe.
3. twin elbow formula steam quality on-line measurement appearance according to claim 1 is characterized in that: the also same keyboard of said single-chip microcomputer, USB interface and RS-232 interface connect.
4. twin elbow formula steam quality on-line measurement appearance according to claim 1 is characterized in that: be provided with heating element in the said well heater, and this heating element is spiral helicine heating tube.
5. twin elbow formula steam quality on-line measurement appearance according to claim 1 is characterized in that: the quality of steam that said inlet end gets into well heater is:
The quality of steam that well heater is flowed out in the outlet side is:
In above-mentioned two formulas, Q
mBe mass rate, Δ P
Go intoBe inlet Bending Tube Sensor differential pressure, X is a steam quality, Δ P
Go outBe outlet Bending Tube Sensor differential pressure, C is coefficient of flow=0.982 (R/2D) 1/2, and R is a Bending Tube Sensor bend pipe radius-of-curvature, and D is a Bending Tube Sensor bend pipe diameter, ρ
VapourBe saturated vapor density, ρ
WaterBe saturation water density; Is conservation according to flowing into well heater with the quality that flows out well heater steam, so
Q
M goes into=Q
M goes out
That is:
After the arrangement, can draw:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220198289 CN202583025U (en) | 2012-05-04 | 2012-05-04 | Double-elbow-pipe steam dryness on-line measurement meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220198289 CN202583025U (en) | 2012-05-04 | 2012-05-04 | Double-elbow-pipe steam dryness on-line measurement meter |
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| CN202583025U true CN202583025U (en) | 2012-12-05 |
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| CN 201220198289 Expired - Fee Related CN202583025U (en) | 2012-05-04 | 2012-05-04 | Double-elbow-pipe steam dryness on-line measurement meter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109115652A (en) * | 2017-06-23 | 2019-01-01 | 刘冰 | A kind of differential pressure type steam dryness measurer and calculation method |
| CN109459533A (en) * | 2018-11-22 | 2019-03-12 | 南京林业大学 | A kind of steam wetness measurement devices and methods therefor |
| CN110108595A (en) * | 2019-04-15 | 2019-08-09 | 中国辐射防护研究院 | A kind of gas-vapour mixing method humidity detection device |
-
2012
- 2012-05-04 CN CN 201220198289 patent/CN202583025U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109115652A (en) * | 2017-06-23 | 2019-01-01 | 刘冰 | A kind of differential pressure type steam dryness measurer and calculation method |
| CN109459533A (en) * | 2018-11-22 | 2019-03-12 | 南京林业大学 | A kind of steam wetness measurement devices and methods therefor |
| CN109459533B (en) * | 2018-11-22 | 2023-10-27 | 南京林业大学 | Steam humidity measuring device and method thereof |
| CN110108595A (en) * | 2019-04-15 | 2019-08-09 | 中国辐射防护研究院 | A kind of gas-vapour mixing method humidity detection device |
| CN110108595B (en) * | 2019-04-15 | 2021-09-24 | 中国辐射防护研究院 | Humidity monitoring device adopting gas-steam mixing method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20150504 |
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| EXPY | Termination of patent right or utility model |