CN103487121B - Fuel gas quality measuring device - Google Patents
Fuel gas quality measuring device Download PDFInfo
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- CN103487121B CN103487121B CN201310398735.XA CN201310398735A CN103487121B CN 103487121 B CN103487121 B CN 103487121B CN 201310398735 A CN201310398735 A CN 201310398735A CN 103487121 B CN103487121 B CN 103487121B
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- fuel cartridge
- combustion gas
- gas
- reference tank
- quality
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Abstract
A fuel gas quality measuring device is characterized in that a high-precision electronic balance is arranged in a closed cavity body, a sample support is arranged on the electronic balance, a fuel gas tank lifting device and a reference tank lifting device are arranged on the sample support, a fuel gas tank and a reference tank are arranged on the fuel gas tank lifting device and the reference tank lifting device respectively, a temperature and humidity pressure sensor is arranged in the closed cavity body, the fuel gas tank is connected with a fuel gas steel bottle, a vacuum pump and a calorimeter through a small-diameter flexible gas pipeline and a four-way valve, a barometer is arranged on the small-diameter flexible gas pipeline, and the electronic balance, the temperature and humidity pressure sensor, the four-way valve, the vacuum pump and the calorimeter are all electrically connected with an industrial control computer. The fuel gas quality measuring device has the advantages of being good in measurement result accuracy and small in uncertainty.
Description
Technical field
The present invention relates to fuel gases calorific value measuring equipment field, relate to a kind of device measuring combustion gas quality more specifically.
Background technology
The measurement of caloric value method of the combustion gas such as rock gas, coal gas, liquefied gas, coal-seam gas and biogas comprises online vapor-phase chromatography and gas calorimeter method two class.
Gas calorimeter measures fuel gases calorific value by direct combustion gas.Common gas heat in respect of two kinds, i.e. flow type gas calorimeter and Culter-Hammer gas calorimeter.Flow type gas calorimeter utilizes current to absorb heat mode to measure calorific value, and namely combustion gas enters Bunsen burner continuous burning, releases heat under a constant; In calorimeter, carry out sufficient heat interchange with continuous constant temperature current makes water flow temperature raise; Finally can according to flow through in the set time quality of calorimetric water, temperature rise, specific heat and combustion gas volume calculate fuel gases calorific value.
Culter-Hammer calorimeter then utilizes air to absorb heat mode to measure calorific value, i.e. combustion gas continuous burning releases heat, carries out sufficient heat interchange and airflow temperature is raised in calorimeter with continuous air flow; Finally can according to flow through in the set time volume of calorimetric air, temperature rise, specific heat and combustion gas volume calculate the calorific value of combustion gas.
Above-mentioned two kinds of calorimeters adopt gas meter to measure the volume of combustion gas, and uncertainty of measurement is in (0.1% ~ 0.4%) scope.According to volume conversion combustion gas quality, then the uncertainty of measurement of combustion gas quality is in (0.1% ~ 0.4%) scope.The uncertainty that combustion gas quality measures is comparatively large, constrains the accuracy of fuel gases calorific value measurement result.
Except above-mentioned two kinds of common continuous burning calorimeters, also has a kind of oxygen bomb formula gas calorimeter of intermittent combustion.In oxygen bomb formula gas calorimeter, combustion gas and oxygen are by airtight oxygen bomb, and after ignition, heat is absorbed by oxygen bomb and water around thereof, finally can according to the calorific value of the volume computing combustion gas of the calorimetric thermal capacity of oxygen bomb and combustion gas.Oxygen bomb formula gas calorimeter water consumption substitution method measures combustion gas volume, there is systematic error in the method, estimate that volume uncertainty of measurement is in (0.1% ~ 0.2%) scope, that is mass measurement uncertainty is in (0.1% ~ 0.2%) scope.
Summary of the invention
A kind of Measurement accuracy is the object of the present invention is to provide to participate in the device of the combustion gas quality of burning, for the mensuration of combustion gas quality during high-precision gas calorimeter measurement fuel gases calorific value.
In order to achieve the above object, the technical solution used in the present invention is as follows:
A kind of combustion gas quality measurement mechanism, it is characterized in that, high-precision electronic balance is provided with in airtight cavity, electronic balance is equipped with sample holder, sample holder is provided with fuel cartridge jacking gear and reference tank jacking gear, fuel cartridge jacking gear and reference tank jacking gear are provided with fuel cartridge and reference tank; At airtight cavity built with temperature humidity pressure transducer; Fuel cartridge is connected with gas cylinder, vacuum pump and calorimeter with four-way valve respectively by thin footpath flexible gas pipeline, and thin footpath flexible gas pipeline is equipped with barometer; Electronic balance, temperature humidity pressure transducer, four-way valve, vacuum pump and calorimeter are all electrically connected with industrial control computer.
Described high Accuracy Electronic Balance, maximum sample weighting amount is not less than 200g, and mass measurement resolution is not more than 0.01mg; Described electronic balance, for weighing the quality of fuel cartridge and reference tank, discharges the difference of forward and backward fuel cartridge quality according to combustion gas, calculate the quality discharging, participate in the combustion gas of burning from fuel cartridge.
Described fuel cartridge, ball-type, the stainless steel being 1.5mm by wall thickness is made; Fuel cartridge stores combustion gas, and pressure is (1.5 × 10
6pa ~ 2.4 × 10
6pa) in scope; Be connected with four-way valve by thin footpath flexible gas pipeline bottom fuel cartridge; Described reference tank, ball-type, the stainless steel being 1.5mm by wall thickness is made, and volume is identical with fuel cartridge volume, and bottom connects thin footpath flexible gas pipeline.
Described sample holder, is placed on the weight-scale table of high Accuracy Electronic Balance, for supporting fuel cartridge or reference tank, to realize the mass measurement of fuel cartridge or reference tank.Fuel cartridge jacking gear, for rising or landing fuel cartridge, when rising fuel cartridge, fuel cartridge does not contact with sample holder, and when landing fuel cartridge, fuel cartridge drops on sample holder, can weigh its quality; Reference tank jacking gear, for rising or landing reference tank, when rising reference tank, reference tank does not contact with sample holder, and when landing reference tank, reference fallers, on sample holder, can weigh its quality.
Described airtight cavity, is made up of stainless steel, and its length, width and height are 600mm × 600mm × 600mm, and there is the vertical hinged door of band view window in its front; Airtight cavity is placed in vibration isolation table; High-precision electronic, sample holder, fuel cartridge, reference tank and temperature humidity pressure transducer etc. are placed in airtight cavity.
Described temperature humidity pressure transducer, for measuring the temperature of air in airtight cavity, humidity and pressure, for calculating atmospheric density; Temperature humidity pressure transducer is connected with computing machine, can transmit real time temperature, humidity and pressure data to computing machine.
Described barometer, is arranged on fuel cartridge and leads on the thin footpath flexible gas pipeline of four-way valve, for measuring gaseous tension in pipeline; Described thin footpath flexible gas pipeline, its internal diameter is not more than 1.5mm, and nonmetallic materials are made, withstand voltage more than 3 × 10
6pa; Described four-way valve, connects fuel cartridge, gas cylinder, gas calorimeter and vacuum pump simultaneously.
Described gas cylinder, volume is 40L, and store flammable pure gas or mixed gas, gaseous tension is (3 × 10
6pa ~ 1.5 × 10
7pa); Described gas calorimeter is intermittent combustion gas calorimeter; Described vacuum pump, is composed in series by molecular pump and mechanical pump, fuel cartridge can be evacuated to air pressure and be less than 1 × 10
-5pa.
Described industrial control computer, for controlling the switch of four-way valve and vacuum pump, for gathering high Accuracy Electronic Balance, temperature humidity pressure transducer, barometer and gas heat measurement amount data, for calculating quality that gas density and fuel cartridge discharge, that participate in the combustion gas of burning.
Advantage of the present invention is, structure is simple, and easy to operate, measurement result accuracy is good, and uncertainty is little.
Accompanying drawing explanation
Fig. 1 is the structural representation of combustion gas quality measurement mechanism.
Embodiment
See Fig. 1, a kind of combustion gas quality measurement mechanism of the present invention, it is characterized in that, high-precision electronic balance 2 is provided with in airtight cavity, electronic balance 2 is equipped with sample holder 3, sample holder 3 is provided with fuel cartridge jacking gear 6 and reference tank jacking gear 4, fuel cartridge jacking gear 6 and reference tank jacking gear 4 are provided with fuel cartridge 8 and reference tank 5; At airtight cavity 9 built with temperature humidity pressure transducer 7; Fuel cartridge 8 is connected with gas cylinder 12, vacuum pump 14 and calorimeter 13 with four-way valve 11 respectively by thin footpath flexible gas pipeline, and thin footpath flexible gas pipeline is equipped with barometer 10; Electronic balance 2, temperature humidity pressure transducer 7, four-way valve 11, vacuum pump 14 and calorimeter 13 are all electrically connected with industrial control computer 1.
Described high Accuracy Electronic Balance 2, maximum sample weighting amount is not less than 200g, and mass measurement resolution is not more than 0.01mg; Described electronic balance 2, for weighing the quality of fuel cartridge 8 and reference tank 5, discharges the difference of forward and backward fuel cartridge quality according to combustion gas, calculate the quality discharging, participate in the combustion gas of burning from fuel cartridge.
Described fuel cartridge 8 is spherical, and the stainless steel being 1.5mm by wall thickness is made; Fuel cartridge 8 stores combustion gas, and pressure is (1.5 × 10
6pa ~ 2.4 × 10
6pa) in scope; The bottom of fuel cartridge 8 is connected with four-way valve 11 by thin footpath flexible gas pipeline; Described reference tank 5 is spherical, and the stainless steel being 1.5mm by wall thickness is made, and volume is identical with the volume of fuel cartridge 8, and bottom connects thin footpath flexible gas pipeline.
Described sample holder 3, is placed on the weight-scale table of high Accuracy Electronic Balance 2, for supporting fuel cartridge 8 or reference tank 5, to realize the mass measurement of fuel cartridge 8 or reference tank 5.Fuel cartridge jacking gear 6, for rising or landing fuel cartridge 8, when rising fuel cartridge 8, fuel cartridge 8 does not contact with sample holder 3, and when landing fuel cartridge 8, fuel cartridge 8 drops on sample holder 3, can weigh its quality; Reference tank jacking gear 4, for rising or landing reference tank 5, when rising reference tank 5, reference tank 5 does not contact with sample holder 3, and when landing reference tank 5, reference tank 5 drops on sample holder 3, can weigh its quality.
Described airtight cavity 9, is made up of stainless steel, and its length, width and height are 600mm × 600mm × 600mm, and there is the vertical hinged door of band view window in its front; Airtight cavity 9 is placed in vibration isolation table (not shown); High Accuracy Electronic Balance 2, sample holder 3, fuel cartridge 8, reference tank 5 and temperature humidity pressure transducer 7 etc. are placed in airtight cavity 9.
Described temperature humidity pressure transducer 7, for measuring the temperature of air in airtight cavity 9, humidity and pressure, for calculating atmospheric density; Temperature humidity pressure transducer 7 is connected with computing machine 1, can transmit real time temperature, humidity and pressure data to computing machine 1.
Described barometer 13, is arranged on fuel cartridge 8 and leads on the thin footpath flexible gas pipeline of four-way valve 11, for measuring gaseous tension in pipeline; Described thin footpath flexible gas pipeline, its internal diameter is not more than 1.5mm, and nonmetallic materials are made, withstand voltage more than 3 × 10
6pa; Described four-way valve 11, its four end connects fuel cartridge 8, gas cylinder 12, gas calorimeter 13 and vacuum pump 14 respectively, changes (automatically being controlled by computing machine 1) as required between each road.
Described gas cylinder 12, volume is 40L, and store flammable pure gas or mixed gas, gaseous tension is (3 × 10
6pa ~ 1.5 × 10
7pa); Described gas calorimeter 13 is intermittent combustion gas calorimeter; Described vacuum pump 14, is composed in series by molecular pump and mechanical pump, fuel cartridge can be evacuated to air pressure and be less than 1 × 10
-5pa.
Described industrial control computer 1, for controlling the switch of four-way valve 11 and vacuum pump 14, for gathering high Accuracy Electronic Balance 2, temperature humidity pressure transducer 7, barometer 10 and gas calorimeter 13 measurement data, for calculating quality that gas density and fuel cartridge discharge, that participate in the combustion gas of burning.
Core of the present invention there is provided a kind of combustion gas quality measurement mechanism, effectively can improve the accuracy of combustion gas quality measurement result.Below in conjunction with accompanying drawing, specific works process of the present invention and principle are illustrated.
First, temperature humidity pressure transducer 7 measures air themperature (T), humidity (h) and atmospheric pressure (P) in airtight cavity 9, and data are transferred to industrial control computer 1, according to following formulae discovery atmospheric density.
In formula: ρ
air---atmospheric density, mg/cm
3;
P---atmospheric pressure in airtight cavity, Pa;
T---air themperature in airtight cavity, K;
H---relative humidity, %;
C
1, c
2---parameter, c
1=3.48488 × 10
-3, c
2=0.37952;
A, B, C and D---be parameter, A=1.23788 × 10
-5, B=-1.91213 × 10
-2, C=33.93711, D=-6.34316 × 10
3.
In measuring process, the change of air themperature, humidity and atmospheric pressure is less, and air density change is also less, therefore can get the mean value of repeatedly atmospheric density measurement result as air density values in the process of measurement quality.In measuring process, be elevated reference tank jacking gear 4 or sample pot jacking gear 6 each time, all need to open airtight cavity, carry out manual operation, after operation, close cavity, read balance, temperature humidity pressure transducer and barometrical reading; The Main Function of airtight cavity is, ensures that balance surrounding environment is without air flowing interference, ensures temperature, pressure and humidity relatively stable.
Secondly, the slope (e) of high Accuracy Electronic Balance 2 is demarcated with the counterweight that quality is known.Fall reference tank jacking gear 4, (sample holder 3 is placed in the sample disc of balance 2 reference tank 5 to be dropped to sample holder 3, have two-layer up and down, sample pot (i.e. fuel cartridge 8) is placed on upper strata, reference tank 5 is placed by lower floor) on, after balance registration is stable, balance reading is made zero; Then on balance, add that a quality is the counterweight of 1.000g, after balance is stable, reads balance registration (m).The slope (i.e. the slope of the counterweight generation of 1.000g) of balance is calculated as follows:
In formula: M---counterweight quality in a vacuum, g;
ρ
air---atmospheric density, mg/cm
3;
ρ
m---counterweight density, mg/cm
3
M---balance registration, g;
The slope of e---balance.
Again, front fuel cartridge 8 quality of combustion gas release is measured.Industrial control computer 1 controls four-way valve 11, and fuel cartridge 8 is connected with vacuum pump 14; Industrial control computer 1 controls vacuum pump 14 and opens, and fuel cartridge 8 is evacuated to air pressure lower than 1 × 10
-4pa; Industrial control computer 1 controls four-way valve 11, and fuel cartridge 8 is connected with gas cylinder 12; Open gas cylinder 12, combustion gas is filled with fuel cartridge 8, and gaseous tension reaches 2.4 × 10
6gas cylinder 12 is closed during Pa; Fall fuel cartridge jacking gear 6, fuel cartridge 8 is dropped on sample holder 3, measure its quality m
s; Rise fuel cartridge jacking gear 6, hold up fuel cartridge 8; Fall reference tank jacking gear 4, reference tank 5 is dropped on sample holder 3, measure its quality m
r.More than measure and all carry out on balance 2, reference tank jacking gear 4 and fuel cartridge jacking gear 6 adopt fork cradle (sample pot 8 and reference tank 5 can be held up) respectively, can be also can be manually aut.eq., bracket be elevated by automatic jacking gear jacking gear (electronic, hydraulic pressure or pneumatic means) automatically.
When weighing fuel cartridge 8, meet formula (4):
em
S＝W
S-V
Sρ
air(4)
When weighing reference tank 5, meet formula (5):
em
R＝W
R-V
Rρ
air(5)
In formula: m
s---measure the reading of balance during fuel cartridge, g;
W
s---the real quality of fuel cartridge, g;
V
s---the volume of fuel cartridge, cm
3;
M
r---measure the reading of balance during reference tank, g;
W
r---the real quality of reference tank, g;
V
r---the volume of reference tank, cm
3.
(the Δ W) of poor quality of sample pot 8 and reference tank 5 is: Δ W=W
s-W
r.
So measure (1) for this, sample pot 8 and the of poor quality of reference tank 5 are:
ΔW
1＝e
1(m
S，1-m
R，1)+ρ
air，1(V
S，1-V
R，1)＝e
1Δm
1+ρ
air，1ΔV
1(6)
In formula, Δ W
1the difference of sample pot and reference tank quality before combustion gas release, g;
Δ m
1the difference of sample pot and reference tank balance registration before combustion gas release, g;
Δ V
1the difference of sample pot and reference tank volume before combustion gas release, cm
3.
Again, the quality of the rear fuel cartridge 8 of combustion gas release is measured.Control four-way valve 11 with industrial control computer 1, fuel cartridge 8 is communicated with calorimeter 13, and combustion gas flows into calorimeter 13 from fuel cartridge 8, and rear sustained combustion is lighted in combustion gas, and the heat that burning produces carries out Measurement accuracy by calorimeter 13; After combustion continuation certain hour, control four-way valve 11 close with industrial control computer 1, combustion gas release stops, and burning terminates.The quality of fuel cartridge 8 and the quality (measuring 2) of reference tank 5 after measuring combustion gas release.Because measure fuel cartridge 8 quality twice before and after combustion gas release, the combustion gas quality therefore discharged is:
w＝ΔW
1-ΔW
2
w＝(e
1Δm
1-e
2Δm
2)+(ΔV
1ρ
air，1-ΔV
2ρ
air，2) (7)
In formula, w is the quality of the combustion gas of release, g;
Δ w
2the difference of sample pot and reference tank quality after combustion gas release, g;
Δ m
2the difference of sample pot and reference tank balance registration after combustion gas release, g;
Δ V
2the difference of sample pot and reference tank volume after combustion gas release, cm
3.
ΔV
1＝V
S，1-V
R，1＝(V
S，0+KP
1)-V
R，0(8)
ΔV
1-ΔV
2＝K(P
1-P
2)＝KΔP (9)
Therefore formula (7) is reduced to further:
w＝e(Δm
1-Δm
2)+KΔPρair (10)
In formula, V
s, 0the volume under fuel cartridge normal pressure, cm
3;
K be fuel cartridge bear unit pressure after the volume change that produces, cm
3/ Pa;
P
1the pressure of fuel cartridge before combustion gas release, Pa;
P
2the pressure of fuel cartridge after combustion gas release, Pa;
Δ P is the change of fuel cartridge pressure before and after combustion gas release, Pa.
Again, the gaseous mass in the flexible gas pipeline of thin footpath cannot be weighed by balance, and the gaseous mass therefore also tackled in the flexible gas pipeline of thin footpath calculates.Gaseous tension before combustion gas release in pipeline is P
1, the gaseous tension after combustion gas release in pipeline is P
2, P
1and P
2detected by the barometer 10 be arranged on the flexible gas pipeline of thin footpath.Change (the Δ m of gaseous mass in pipeline
pipeline) be:
In formula, Δ m
pipelinebefore and after combustion gas release, the change of gaseous mass in pipeline, g;
V
pipelinefor the volume of pipeline, cm
3;
M is the molecular weight of combustion gas, g/mol;
R is gas law constant, 8.314J/molK;
T is the temperature in airtight cavity, K.
The gaseous mass modified value (w ') of the participation burning then discharged is:
In formula, w ' is the gaseous mass modified value participating in burning, g.
Finally, it should be noted that the present invention measures the uncertainty of combustion gas quality.Through evaluation (method of evaluation is known technology), consider the category-A uncertainty from measurement result repeatability, and from the category-B uncertainty outside measurement result repeatability, final when combustion gas quality is about 1g, the expanded uncertainty that combustion gas quality is measured is about 0.02% (spreading factor k=2).
Above a kind of combustion gas quality measurement mechanism provided by the invention is described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. a combustion gas quality measurement mechanism, it is characterized in that, high-precision electronic balance is provided with in airtight cavity, electronic balance is equipped with sample holder, sample holder is provided with fuel cartridge jacking gear and reference tank jacking gear, fuel cartridge jacking gear and reference tank jacking gear are provided with fuel cartridge and reference tank; At airtight cavity built with temperature humidity pressure transducer; Fuel cartridge is connected with gas cylinder, vacuum pump and calorimeter with four-way valve respectively by thin footpath flexible gas pipeline, and thin footpath flexible gas pipeline is equipped with barometer; Electronic balance, temperature humidity pressure transducer, four-way valve, vacuum pump and calorimeter are all electrically connected with industrial control computer.
2. combustion gas quality measurement mechanism according to claim 1, is characterized in that, the maximum sample weighting amount of described electronic balance is not less than 200g, and mass measurement resolution is not more than 0.01mg; Described electronic balance, for weighing the quality of fuel cartridge and reference tank, discharges the difference of forward and backward fuel cartridge quality according to combustion gas, calculated the quality discharging, participate in the combustion gas of burning from fuel cartridge by industrial control computer.
3. combustion gas quality measurement mechanism according to claim 1, is characterized in that, described fuel cartridge and reference tank are spherical, and the stainless steel being 1.5mm by wall thickness is made, and both volumes are identical; Fuel cartridge stores combustion gas, and pressure is 1.5 × 10
6pa ~ 2.4 × 10
6within the scope of Pa; Be connected with four-way valve by thin footpath flexible gas pipeline bottom fuel cartridge.
4. combustion gas quality measurement mechanism according to claim 1, is characterized in that, described sample holder is placed on the weight-scale table of high Accuracy Electronic Balance, for supporting fuel cartridge or reference tank, to realize the mass measurement of fuel cartridge or reference tank;
Described fuel cartridge jacking gear is used for rising or landing fuel cartridge, and when rising fuel cartridge, fuel cartridge does not contact with sample holder, and when landing fuel cartridge, fuel cartridge drops on sample holder, can weigh its quality;
Described reference tank jacking gear, for rising or landing reference tank, when rising reference tank, reference tank does not contact with sample holder, and when landing reference tank, reference fallers, on sample holder, can weigh its quality.
5. combustion gas quality measurement mechanism according to claim 1, is characterized in that, described airtight cavity is made up of stainless steel, and its length, width and height are 600mm × 600mm × 600mm, and there is the vertical hinged door of band view window in its front; Airtight cavity is placed in vibration isolation table.
6. combustion gas quality measurement mechanism according to claim 1, is characterized in that, described temperature humidity pressure transducer is for measuring the temperature of air in airtight cavity, humidity and pressure; And to real time temperature, humidity and pressure data that computing machine transmission is measured.
7. combustion gas quality measurement mechanism according to claim 1, is characterized in that, described barometer is arranged on fuel cartridge and leads on the thin footpath flexible gas pipeline of four-way valve, for measuring gaseous tension in pipeline; Described thin footpath its internal diameter of flexible gas pipeline is not more than 1.5mm, and nonmetallic materials are made, withstand voltage more than 3 × 10
6pa; Described four-way valve is three-position four-way valve, can change at fuel cartridge and between gas cylinder, gas calorimeter or vacuum pump respectively.
8. combustion gas quality measurement mechanism according to claim 7, is characterized in that, the volume of described gas cylinder is 40L, and store flammable pure gas or mixed gas, gaseous tension is 3 × 10
6pa ~ 1.5 × 10
7pa; Described gas heat counts intermittent combustion gas calorimeter; Described vacuum pump is composed in series by molecular pump and mechanical pump, fuel cartridge can be evacuated to air pressure and be less than 1 × 10
-5pa.
9. combustion gas quality measurement mechanism according to claim 1, it is characterized in that, described industrial control computer is for controlling the switch of four-way valve and vacuum pump, for gathering electronic balance, temperature humidity pressure transducer, barometer and gas heat measurement amount data, for calculating quality that gas density and fuel cartridge discharge, that participate in the combustion gas of burning.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310398735.XA CN103487121B (en) | 2013-09-05 | 2013-09-05 | Fuel gas quality measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310398735.XA CN103487121B (en) | 2013-09-05 | 2013-09-05 | Fuel gas quality measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN103487121A CN103487121A (en) | 2014-01-01 |
| CN103487121B true CN103487121B (en) | 2015-06-24 |
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|---|---|---|---|
| CN201310398735.XA Expired - Fee Related CN103487121B (en) | 2013-09-05 | 2013-09-05 | Fuel gas quality measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105352751B (en) * | 2015-12-15 | 2018-06-19 | 山东大学 | A kind of biogas generating set heat efficiency and electrical efficiency measurement System and method for |
| CN107957290B (en) * | 2016-10-14 | 2020-04-17 | 株式会社龙野 | Calibration device |
| CN115877197B (en) * | 2022-12-17 | 2023-07-14 | 武汉杭久电气有限公司 | Detection device for circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3220842A1 (en) * | 1982-06-03 | 1983-12-08 | Janke & Kunkel GmbH & Co KG Ika - Werk, 7813 Staufen | Process and apparatus for filling the inner boiler of a combustion calorimeter |
| CN1280672A (en) * | 1997-12-02 | 2001-01-17 | 艾伦L·史密斯 | Mass and heat flow measurement sensor |
| CN1824933A (en) * | 2005-02-23 | 2006-08-30 | 株式会社东芝 | Lng power plant and operation method thereof |
| CN201548301U (en) * | 2009-12-01 | 2010-08-11 | 郑云林 | Weighing container for avoiding evaporation of hot water |
| JP2011079876A (en) * | 2009-10-02 | 2011-04-21 | Bridgestone Corp | Rubber composition and tire using the same |
-
2013
- 2013-09-05 CN CN201310398735.XA patent/CN103487121B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3220842A1 (en) * | 1982-06-03 | 1983-12-08 | Janke & Kunkel GmbH & Co KG Ika - Werk, 7813 Staufen | Process and apparatus for filling the inner boiler of a combustion calorimeter |
| CN1280672A (en) * | 1997-12-02 | 2001-01-17 | 艾伦L·史密斯 | Mass and heat flow measurement sensor |
| CN1824933A (en) * | 2005-02-23 | 2006-08-30 | 株式会社东芝 | Lng power plant and operation method thereof |
| JP2011079876A (en) * | 2009-10-02 | 2011-04-21 | Bridgestone Corp | Rubber composition and tire using the same |
| CN201548301U (en) * | 2009-12-01 | 2010-08-11 | 郑云林 | Weighing container for avoiding evaporation of hot water |
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| CN103487121A (en) | 2014-01-01 |
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