CN1091249C - Measuring method and device for solid material flow rate - Google Patents
Measuring method and device for solid material flow rate Download PDFInfo
- Publication number
- CN1091249C CN1091249C CN00109016A CN00109016A CN1091249C CN 1091249 C CN1091249 C CN 1091249C CN 00109016 A CN00109016 A CN 00109016A CN 00109016 A CN00109016 A CN 00109016A CN 1091249 C CN1091249 C CN 1091249C
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- China
- Prior art keywords
- flow
- measuring
- flow rate
- measuring tube
- media
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Abstract
The present invention relates to a method and a device for measuring the flow rate of solid materials, particularly to a method and a device for indirectly measuring the flow rate of materials by utilizing heat transfer characteristics between fluid solid materials and measurement elements. The present invention uses a measurement tube filled with water, air or other fluid media, a temperature sensor and a flow rate sensor as measurement elements, and utilizes a secondary instrument to directly display the flow rate of the solid materials according to relation between the heat absorption (release) quantity and medium flow rate of measurement media in the inlet and the outlet of the measurement tube and the flow rate of the materials. The method has the advantages of simple operation, easy installation, reliable measurement results and high precision and is free from the influences of measured objects, installation devices and other external factors. The device has the advantages of low cost and little maintenance amount, and is especially suitable for circulating fluidized bed boilers or other circulating fluidized bed reactors; the device can also be used for measuring the flow rate of other single-phase descending fluid solid materials.
Description
Technical field
The present invention relates to method and device that a kind of mass flow is measured, relate in particular to a kind of heat transfer characteristic of utilizing mobile solid material and measuring between the assembly and measure single-phase solid material flow-measuring method and device indirectly.
Background technology
According to different measuring principles and different measuring object and actual requirements, measurement has had many-sided research to mass flow in the prior art.Mainly contain rays method, specific volume method, mechanics method and mixing method at present.Solid and gas came calculated flow rate to the ray influence is different when rays method utilized ray to pass through Dual-Phrase Distribution of Gas olid, owing at present to the consideration of radiographic source safety issue, cause in commercial Application to be affected always.The specific volume method is to calculate the flow of material according to the difference of solid and gas dielectric constant, and the change in dielectric constant of solid thermal material is bigger under the different condition, and the stability of measured signal is brought error on the order of magnitude to measurement result.The mechanics method is the impulsive force of measuring assembly to be reflected flow when measuring solid material and descend, and measures the transmission of fixing, power of assembly and the sealing of measuring assembly and solid material place pipeline enclosure can't solve.Mixing method is the flow that variation of temperature is calculated solid before and after mixing with the material of other different temperatures according to the solid thermal material.Mixing in this method is prerequisite, requires relatively accurately to understand tested solid material and the specific heat capacity of blending agent and temperature, the flow of blending agent; And the temperature of measuring object and blending agent should have bigger variation before and after mixing, and therefore certain limitation is arranged in actual applications.For example in Circulating Fluidized Bed Boiler and other circulating fluid bed reactor, this precondition does not exist, and therefore can not use in practice.
Summary of the invention
At the deficiencies in the prior art and defective, purpose of the present invention and task are the heat transfer characteristics of utilizing between mobile solid material and the measurement assembly, the method and the device of the single-phase solid material flow measurement under a kind of indirect measurement all temps are provided, not only measuring method is simple to make it, easy for installation, and to measuring object and the not influence of measurement assembly, and measurement result is reliable, low price.
The present invention is achieved by the following technical solutions: the method for this measuring flow of solid material, and its feature may further comprise the steps:
A, the one or more inside of employing are connected with the measuring tube of water, air dielectric, make the center of this measuring tube by the tested material flow section;
Mounting temperature sensor in b, the import at measuring tube, outlet and the tested material flow section records the import and export temperature of measuring media and the temperature signal of tested material respectively;
C, flow sensor is installed in measuring tube, is recorded the flow signal of measuring media;
D, temperature and the flow signal of gathering is input to secondary instrument,, utilizes data processor calculating and demonstrate the flow of solid material according to suction (putting) heat of measuring tube import and export measuring media and the relational expression of rate-of flow and mass flow.
A kind of device of implementing above-mentioned measuring method, it is characterized in that this device comprises that one contains the secondary instrument of data processor and the measuring tube that one or more inside is connected with water, air dielectric, and in import, outlet and the tested material flow section of measuring tube, temperature sensor is housed, in the import of measuring tube flow sensor and flow control valve are housed, and measuring tube, flow control valve and flow sensor are coupled together with adapting pipe.
Advantage of the present invention is that operating procedure is simple, and is easy for installation, be not subjected to the influence of measurand, erecting equipment and other extraneous factor simultaneously, so measurement result is reliable, and precision is higher.And the various measurement assemblies that use are thermal meter with low cost, dependable performance, so cost is low, maintenance is little.Be specially adapted in Circulating Fluidized Bed Boiler or other circulating fluid bed reactor, also can be used in the flow measurement of the mobile solid material of other single-phase decline.
Description of drawings
Fig. 1 is a structural principle synoptic diagram of the present invention.
Among the figure: 1. solid material 8. measuring media that in downtake, flow of measuring tube 2. temperature sensors 3. flow sensors 4. adapting pipes 5. flow control valves 6. secondary instruments 7..
Embodiment
Specify measuring principle of the present invention, measuring process and preferred forms below in conjunction with accompanying drawing:
This measurement mechanism comprises that one contains the secondary instrument 6 of data processor and the measuring tube 1 that one or more inside is connected with water, air or other fluid media (medium), and measuring tube 1 is selected plain carbon steel or alloy steel according to the temperature of solid material.In import, outlet and the tested material flow section of measuring tube temperature sensor 2 is housed respectively, the tested material flow section is generally circle, square or other zhou duicheng tuxing.In the import of measuring tube flow sensor 3 is housed, this sensor can be according to the different choice liquid or the gas meter of medium.The flow that flow control valve 5 is used to regulate measuring media and couples together measuring tube 1, flow control valve 5 and flow sensor 3 with adapting pipe 4 in suitable scope.
The present invention is that mobile solid material of utilization and the heat transfer characteristic between the measuring tube are measured the mass flow under all temps indirectly.Its measuring principle is to measure according to the relation of the suction of measuring tube import and export measuring media (putting) heat and Flow of Goods and Materials flow.
If the measuring media inlet temperature is t
1(℃), outlet temperature is t
2(℃), flow is G
0(kg/h), the suction of measuring media (putting) heat Q then
0For:
Q
0＝G
0[c
f(t
2)t
2-c
f(t
1)t
1]
c
f(t) hold for the ratio of specific heat of measuring media when temperature is t.The suction of measuring media (putting) heat is the surface area F that solid material passes through measuring tube
0Carry out exchange heat with measuring media.Heat transfer capacity Q
1=KF
0(t
s-t
f), because that suction (putting) heat of measuring tube is compared with total thermal capacitance of material is very little, to the temperature t of solid material
sInfluence very little, the medial temperature t of measuring media
fFor:
t
f＝(t
2-t
1)/2
And Coefficient K is solid materiel flux G
1Function, that is:
K＝f(G
1)
G
1＝f
1(K)
The suction of measuring media (putting) heat should equal heat transfer capacity, Q
0=Q
1, that is:
G
0[c
s(t
2)t
2-c
s(t
1)t
1]＝KF
0(t
s-t
f)
Then
K＝G
0[c
s(t
2)t
2-c
s(t
1)t
1]/[F
0(t
s-t
f)]
Solid materiel flux G
1For:
G
1＝f
1(G
0[c
s(t
2)t
2-c
s(t
1)t
1]/[F
0(t
s-t
f)])。
Above-mentioned formula has provided solid materiel flux G
1And the mathematical relation between the survey data.
According to above-mentioned measuring principle and device, measuring process of the present invention is as follows:
One or more inside are connected with the measuring tube 1 of water, air or other fluid media (medium), pass the center of tested material flow section; Open and also to regulate flow control valve 5, make the medium 8 of the certain flow measuring tube 1 of flowing through, by surface and solid material 7 heat exchange of measuring tube 1, medium flow out measuring tube 1 afterwards temperature will change.Mounting temperature sensor 2 in import, outlet and the tested material flow section of measuring tube records the import and export temperature of measuring media and the temperature signal of tested material respectively; Flow sensor 3 is installed in measuring tube, is recorded the flow signal of measuring media; Temperature and the flow signal gathered are input in the secondary instrument 6 that contains data processor, according to suction (putting) heat of measuring tube import and export measuring media and the relational expression of rate-of flow and mass flow, utilize data processor to calculate and on secondary instrument, directly demonstrate the flow value of solid material.
Above-mentioned measurement is not carry out for not containing gas or containing under the less condition of gas at solid material.When the temperature of solid material during relatively near normal temperature (being lower than 60 ℃), measuring tube is the heat release formula, it is the inlet temperature higher (being higher than 70 ℃) of measuring media, when the temperature of solid material during than higher (being higher than 60 ℃), measuring tube is a heat absorption type, and promptly the inlet temperature of measuring media should lower (being lower than 50 ℃).
Claims (2)
1, a kind of method of measuring flow of solid material, its feature may further comprise the steps:
A, the one or more inside of employing are connected with the measuring tube of water, air dielectric, make the center of this measuring tube by the tested material flow section;
Mounting temperature sensor in b, the import at measuring tube, outlet and the tested material flow section records the import and export temperature of measuring media and the temperature signal of tested material respectively;
C, flow sensor is installed in measuring tube, is recorded the flow signal of measuring media;
D, temperature and the flow signal of gathering is input to secondary instrument,, utilizes data processor calculating and demonstrate the flow of solid material according to suction (putting) heat of measuring tube import and export measuring media and the relational expression of rate-of flow and mass flow.
2, a kind of enforcement device of measuring method according to claim 1, it is characterized in that this device comprises that one contains the secondary instrument of data processor and the measuring tube that one or more inside is connected with water, air dielectric, and in import, outlet and the tested material flow section of measuring tube, temperature sensor is housed, in the import of measuring tube flow sensor and flow control valve are housed, and measuring tube, flow control valve and flow sensor are coupled together with adapting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00109016A CN1091249C (en) | 2000-06-02 | 2000-06-02 | Measuring method and device for solid material flow rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00109016A CN1091249C (en) | 2000-06-02 | 2000-06-02 | Measuring method and device for solid material flow rate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1271088A CN1271088A (en) | 2000-10-25 |
| CN1091249C true CN1091249C (en) | 2002-09-18 |
Family
ID=4579366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00109016A Expired - Fee Related CN1091249C (en) | 2000-06-02 | 2000-06-02 | Measuring method and device for solid material flow rate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1091249C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870012A (en) * | 2017-11-08 | 2018-04-03 | 西安西热锅炉环保工程有限公司 | The device and method of rate-of flow under a kind of heat balance method of test complex environment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4215565A (en) * | 1977-09-01 | 1980-08-05 | Agar Instrumentation Inc. | Method and apparatus for testing a fluid |
| US4255968A (en) * | 1979-06-08 | 1981-03-17 | Intek, Inc. | Flow indicator |
-
2000
- 2000-06-02 CN CN00109016A patent/CN1091249C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4215565A (en) * | 1977-09-01 | 1980-08-05 | Agar Instrumentation Inc. | Method and apparatus for testing a fluid |
| US4255968A (en) * | 1979-06-08 | 1981-03-17 | Intek, Inc. | Flow indicator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1271088A (en) | 2000-10-25 |
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| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |