CN204044093U - A kind of Analytical system of Equivalent Thermal Conductivities - Google Patents
A kind of Analytical system of Equivalent Thermal Conductivities Download PDFInfo
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- CN204044093U CN204044093U CN201420426653.1U CN201420426653U CN204044093U CN 204044093 U CN204044093 U CN 204044093U CN 201420426653 U CN201420426653 U CN 201420426653U CN 204044093 U CN204044093 U CN 204044093U
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Abstract
The utility model relates to a kind of Analytical system of Equivalent Thermal Conductivities, comprise test specimen tube, heating system, natural gas gathering system and data acquisition processing system, described test specimen tube comprises sample cylindrical shell and sample cover, described heating system comprises heating arrangement, D.C. regulated power supply and AC power, described natural gas gathering system comprises discharge and gas extractor, described data acquisition processing system comprises sniffer, data collector and data processing equipment, the barrel of described sample cylindrical shell comprises heater element from inside to outside, heat-insulation layer and shell, described sample cover comprises cover and lower cover, be connected with sealed tube by described discharge between upper cover and lower cover, graphite gasket is provided with between described sample cover and described sample cylindrical shell, described heating arrangement is arranged at the axial location of test specimen tube, described gas extractor passes through described discharge from described test specimen tube internal gathering gas, described sniffer is arranged on the position of described test specimen tube internal deviation test specimen tube axis.
Description
Technical field
The utility model relates to a kind of Analytical system of Equivalent Thermal Conductivities, is particularly useful for the mensuration that pyrolytic can produce the Equivalent Thermal Conductivities of the material of gas.
Background technology
Coefficient of heat conductivity refers to the heat by unit area in store list bit time under unit gradient effect, and this physical quantity is the important parameter of characterizing material heat conductivility.The lump material piled up can be considered as being a kind of assembly coexisted by heterogeneous material, and the lump coal such as piled up is exactly the assembly be made up of coal, moisture in coal and interstitial gas.Heat-transfer mechanism in this assembly is very complicated, comprises heat conduction, convection current and radiation three kinds of modes, so the coefficient of heat conductivity of lump material is in fact the apparent parameter of three kinds of heat transfer forms, is total effect of heat transfer, therefore is called equivalent heat transfer factor.Compared to the coefficient of heat conductivity of material, Equivalent Thermal Conductivities makes the diabatic process studying the lump material inside of piling up more simple and convenient.
Generally, the Equivalent Thermal Conductivities of material can only be adopted and experimentally measure.Cold store enclosure is the thermal conductivity measurement method developed in nearest decades, is changed in time, thus calculate coefficient of heat conductivity by the Temperature Distribution measuring sample.The feature of the method is that Measuring Time is short, accuracy is high, low to environmental requirement, be used for research high thermal conductivity coefficient material, or measure under the high temperature conditions.Wherein the range of application of heat-pole method is relatively extensive, is applied in the mensuration of liquid, Powdered, graininess or bulk material coefficient of heat conductivity.Heat-pole method is in measuring process, and the temperature rise of sample and thermograde are all very little, thus the result recorded can be considered the thermal conductivity value determined at temperature.When utilizing heat-pole method to measure, sample can homogeneous heating at a certain temperature, avoids and measures material thermal conductivity under higher temperature and occur that specimen surface burning and measurement data definitely can not represent the problem of sample coefficient of heat conductivity.
Current heat-pole method is used for greatly measuring the material Equivalent Thermal Conductivities under normal temperature or lower temperature, does not measure the device of the Equivalent Thermal Conductivities of material under hot conditions, and being especially applicable to high temperature can the determinator of Equivalent Thermal Conductivities of aerogenesis material.And the function of the Equivalent Thermal Conductivities of material normally temperature, the Equivalent Thermal Conductivities of material has bigger difference at different temperatures.Industrial production status is carry out at relatively high temperatures mostly, such as destructive distillation, calcining etc., and therefore under measurement hot conditions, the Equivalent Thermal Conductivities of material is even more important.
Application number be 200910144808.6 invention provide a kind of method and system measuring thermo-physical property of loose coals, disposablely can survey thermo-physical property of loose coals simultaneously, comprise coefficient of heat conductivity, thermal diffusivity and specific heat capacity.But this technology can only measure the hot physical property of loose coal under normal temperature, the thermophysical property of loose coal under high temperature can not be obtained, therefore can not obtain thermo-physical property of loose coals variation with temperature relation.
Utility model content
(1) technical matters solved
In order to overcome the defect of prior art, the utility model provides a kind of measurement mechanism and method of lump material Equivalent Thermal Conductivities, under can realizing measuring high temperature (<1000 DEG C), block decomposition can the Equivalent Thermal Conductivities of aerogenesis material (such as, lump coal, waste tire, solid refuse, ore etc.).
(2) technical scheme
The utility model discloses a kind of Analytical system of Equivalent Thermal Conductivities, comprise test specimen tube, heating system, natural gas gathering system and data acquisition processing system, described test specimen tube comprises sample cylindrical shell and sample cover, described heating system comprises heating arrangement, D.C. regulated power supply and AC power, described natural gas gathering system comprises discharge and gas extractor, described data acquisition processing system comprises sniffer, data collector and data processing equipment, most high assay temperature 1000 DEG C, wherein, described sample cylindrical shell comprises heater element, described heater element is connected with described AC power, described sample cover comprises cover, lower cover and sealed tube, be connected with sealed tube by described discharge between described upper cover and described lower cover, and described discharge and described sealed tube run through described upper cover and described lower cover, packoff is provided with between described sealed tube and described sample cover, described heating arrangement and described sniffer pass from described packoff respectively by described sealed tube, described heating arrangement is connected with the described D.C. regulated power supply outside test specimen tube, described sniffer is connected with the described data collector outside test specimen tube, described gas extractor passes through described discharge from described test specimen tube internal gathering gas, the data analysis that described data processing equipment gathers described data collector.
The barrel of described sample cylindrical shell comprises heater element, heat-insulation layer and shell from inside to outside, and described heating arrangement is arranged at the axial location of test specimen tube, and described sniffer is arranged on the position of described test specimen tube internal deviation test specimen tube axis.
Further, described Analytical system comprises water-circulating cooling device, and described water-circulating cooling device is connected with described upper cover.
Further, described natural gas gathering system comprises gas quench system further, and it is arranged between described discharge and described gas extractor.
Further, described heater element is high-temperature electric resistance furnace silk or Elema.
Further, graphite gasket is provided with between described sample cover and described sample cylindrical shell.
Further, described heating arrangement is hot line.
Further, described sniffer is two K type thermopairs, and described two K type thermopairs are positioned on the same sagittal plane centered by test specimen tube axis.
Further, described data processing equipment calculates Equivalent Thermal Conductivities by heat-pole method.
The invention also discloses a kind of assay method of Equivalent Thermal Conductivities, described data processing equipment utilizes heat-pole method to calculate Equivalent Thermal Conductivities by following steps:
1) in the axial location of test specimen tube, insert heating arrangement, simultaneously sniffer is set departing from a distance, heating arrangement center, and records the distance between sniffer and heating arrangement center;
2) sample to be tested is loaded in test specimen tube at random;
3) testing temperature is treated in setting, when sample inner barrel reaches after testing temperature, is incubated;
4) when specimen temperature in test specimen tube arrives after stable state, the heating rate of test specimen tube is set, starts the temperature at writing time and sniffer place;
5) heating power of heating arrangement is set, from D.C. regulated power supply connected by heating arrangement, the temperature at writing time and sniffer place;
6) step 3 is repeated) to step 5), the Equivalent Thermal Conductivities of the material obtained under different temperatures is calculated according to measurement data.
Further, described heating arrangement is hot line, described sniffer is two K type thermopairs, described data processing equipment calculates Equivalent Thermal Conductivities based on the data of two K types thermocouple measurement and comprises further: respectively having, without the heating power connecting writing time and temperature of charge and hot line under D.C. regulated power supply condition, according to
calculate Equivalent Thermal Conductivities, wherein, λ is coefficient of heat conductivity, and q is heating power, r
1and r
2be respectively the distance of two K type thermopair test coupon cylinder axis, when Δ θ is q=0, the temperature difference between two K type thermopairs, when Δ θ ' is for q ≠ 0, the temperature difference between two K type thermopairs.
(3) beneficial effect
1) the utility model provides a kind of Equivalent Thermal Conductivities determinator and achieves the mensuration that the lump material Equivalent Thermal Conductivities of decomposition reaction generation gas can occur high temperature.
2) sample cover adopts upper and lower two-part structure, and upper part cools, and lower part seals, and has both ensured that serum cap can not melt under the high temperature conditions and cause decomposing the gas leakage produced; Realize again the sealing to test specimen tube, and the temperature of charge in test specimen tube can not be affected.
3) heater element in sample cylindrical shell barrel adopts high-temperature electric resistance furnace silk or Elema, is connected with AC power, for sample provides can the heat of temperature programme, provide the uniform thermal environment that Equivalent Thermal Conductivities is measured.
4) natural gas gathering system can realize the storage of pyrolysis gas on the one hand, ensures in experimentation without gas discharging; On the other hand, because the gas of pyrolytic is discharged in real time from test specimen tube, the Equivalent Thermal Conductivities measured in testing is made to include the impact of pyrolysis gas precipitation on it.
5) the utility model utilizes heat-pole method can obtain the Equivalent Thermal Conductivities of the lump material under different temperatures.
Accompanying drawing explanation
Fig. 1 is the utility model system architecture schematic diagram.
In figure: 1: sample cylindrical shell, 2: hot line, 3: sample cover (wherein 3-1 is that test specimen tube covers part, and 3-2 is sample cover lower part), 4: discharge, 5: thermopair, 6: serum cap, 7: water-circulating cooling device, 8: D.C. regulated power supply, 9: gas quench system, 10: gas extractor, 11: data collector, 12: data processing equipment, 13: AC power, 14: graphite gasket, 15: sealed tube.
Be below embodiment, and by reference to the accompanying drawings the utility model patent be described further.
Embodiment
As shown in Figure 1, Operation system setting comprises test specimen tube, heating system, natural gas gathering system, data acquisition processing system four parts to measuring system in the present embodiment.
Test specimen tube: test specimen tube is made up of sample cylindrical shell 1 and sample cover 3, is provided with graphite gasket 14 and seals between sample cylindrical shell and sample cover.Wherein sample cylindrical shell 1 barrel comprises heater element, heat-insulation layer and shell three parts from inside to outside; Heater element adopts high-temperature electric resistance furnace silk or Elema, is connected with AC power 13, for sample provides can the heat of temperature programme.In order to eliminate the impact of external environment condition interference on measuring accuracy as far as possible, sample cylindrical shell 1 heat-insulation layer is refractory fibre heat-insulation layer, and this form has good heat-insulating property, and shell is stainless steel.Sample cover 3 is divided into upper and lower two parts, and two parts are connected with sealed tube 15 by means of only discharge 4, and wherein sealed tube 15 can insert hot line 2 and thermopair 5, avoids the upper and lower two-part temperature of test specimen tube lid to influence each other.Test specimen tube covers part 3-1 and is reserved with discharge 4, sealed tube 15 and the serum cap 6 as packoff between sealed tube and described sample cover.Upper part 3-1 is connected with water-circulating cooling device 7, reduces the temperature of discharge 4 and sealed tube 15, ensures that serum cap 6 can not melt under the high temperature conditions and cause gas leakage; Sample cover lower part 3-2 is connected with sample cylindrical shell 1 with graphite gasket 14, isolated air, provides confined space for sample heats up.
Heating system: heating system comprises two parts, a part is for the heater element of sample cylindrical shell 1 provides the AC power 13 of working power; Another part comprises hot line 2, and provides the D.C. regulated power supply 8 of working power for hot line 2.
Natural gas gathering system: the high-temperature gas that lump material (particle diameter is 5 ~ 50mm) at high temperature decomposes generation is derived through discharge 4, after apparatus for supercooling 9 cools, enters gas extractor 10 and stores.Natural gas gathering system can realize the storage of pyrolysis gas on the one hand, ensures in experimentation without gas discharging; On the other hand, because the gas of pyrolytic is discharged in real time from test specimen tube, the Equivalent Thermal Conductivities measured in testing is made to include the impact of pyrolysis gas precipitation on it.
Data acquisition processing system: data acquisition processing system comprises two K type thermopairs 5, data collector 11 and data processing equipments 12.Arrange thermopair 5 departing from test specimen tube axial location, directly measure the temperature variation in sample, temperature measuring data is gathered by data collector 11, and transfers to data processing equipment 12 by Programme Line.
The utility model adopts heat-pole method to measure lump material Equivalent Thermal Conductivities.The ultimate principle of heat-pole method measures to be placed on the temperature rise of wire thermal source and the Temperature Distribution of internal batch in sample, and the relation of moving speed and material characteristic according to heat obtains the coefficient of heat conductivity of material.
The concrete operation step corresponding with said system is as follows:
1, in the axial location of test specimen tube, insert hot line, simultaneously thermopair measuring point is set departing from Call Center a distance, and record is apart from the distance of hot line.
2, block sample to be measured (particle diameter is 5 ~ 50mm) is loaded in test specimen tube at random; Put graphite gasket, cover cover, and hot line and thermopair are passed from the sealed tube cover, with serum cap, sealed tube is sealed.
3, discharge is connected with natural gas gathering system; Cover upper part is connected with circulating water device, and passes into recirculated cooling water; Hot line is connected with direct supply; Two K type thermopairs are connected with data acquisition processing system; Test specimen tube is connected with AC power.
4, testing temperature is treated in setting, when cylindrical shell reaches after testing temperature, is incubated, and ensures that in cylindrical shell, specimen temperature distribution is stable.
5, when specimen temperature in test specimen tube arrives after stable state, the programmed rate of test specimen tube is set, starts the temperature at writing time and thermopair place.
6, the heating power of hot line is set, from hot line switches on power, the temperature at writing time and thermopair place.
7, repeat step 4-6, experimentally data can calculate the Equivalent Thermal Conductivities of the lump material obtained under different temperatures.
8, in whole experimentation, open gas quench system, the pyrolysis gas that discharge is derived is lowered the temperature, is convenient to store in gas extractor.
In above-mentioned steps 7, the Equivalent Thermal Conductivities of the lump material under different temperatures can be obtained based on the formula 7 hereafter derived.It is concrete that to shift process onto as follows:
Suppose an infinitely long cylinder, be placed in the electric furnace that temperature changes by straight line rule, initial temperature is constant T
0, then, after elapsed time t, furnace temperature becomes T
c=T
0+ Bt.Have the line heat source of an endless at material center place, its heating power is q (W/m), from heat conduction theory, in the change in the temperature field that infinitely great interior of articles is caused by thermal source, can be described by the following one-dimensional heat conduction differential equation:
θ＝T-T
0 (2)
Starting condition: t=0, θ=0 (3)
Boundary condition:
According to the above-mentioned equation of Boundary Condition for Solving, can obtain
Two point for measuring temperature r1 in the sample to which, temperature difference θ when r2 place measures q=0 and q ≠ 0 respectively and Δ θ ', then have
Wherein:
λ is coefficient of heat conductivity, W/m-K
A is thermal diffusivity, m
2/ s
α is environment and the cylindrical coefficient of heat transfer, W/m
2-K
R is certain some distance apart from hot line in sample, m
R
ifor the radius of hot line, m
R
ofor the external radius of material, m
T is to the time of measuring the moment from heating, s
T is temperature, DEG C
T
cfor environment temperature, DEG C
θ is Excess temperature, DEG C
B is the rate of heat addition, K/s
Q is heating power, W/m.
In order to further set forth the utility model, two most preferred embodiments hereinafter will be provided.
Most preferred embodiment one: particle diameter is the mensuration of 30mm coal cinder Equivalent Thermal Conductivities
1, in the axial location of test specimen tube, insert diameter is 0.5mm nickel chromium triangle hot line, is arranging two thermopair measuring points respectively simultaneously, and ensure that two thermopair measuring points are on same sagittal plane from Call Center 3mm, 5mm place.
2, take 3.01kg lump coal to be deposited at random in test specimen tube, load onto graphite gasket on the top of test specimen tube, cover cover, and hot line and thermopair are passed from the sealed tube cover, with serum cap, sealed tube is sealed.
3, discharge is connected with natural gas gathering system; Cover upper part is connected with circulating water device, and passes into recirculated cooling water; Hot line is connected with direct supply; Two K type thermopairs are connected with data acquisition processing system; Test specimen tube is connected with AC power.
4, when temperature in sample is consistent with fire box temperature, control fire box temperature and change by the straight line rule of 0.2 DEG C/min, from connection AC power, record data, writing time is 5min; After record, opening direct supply, is 2.7w to the power input of hot line, and from connection direct supply, record data, writing time is 5min; After record, close direct supply.
5, after specimen temperature reaches next temperature nodes 100 DEG C, insulation 1h; When specimen temperature in test specimen tube arrives after stable state, repeat step 4, experimentally data can calculate the lump coal Equivalent Thermal Conductivities at acquisition 100 DEG C.
6, repeat step 4-5, experimentally data can calculate the lump coal Equivalent Thermal Conductivities at obtaining 200 DEG C, 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C respectively.
7, reaction terminates, and closes all power supplys to stop heating, takes out after the cooling of test specimen tube medium-sized coal; The pyrolysis gas stored in emptying natural gas gathering system; Release recirculated water; Carry out data processing.
| Temperature [DEG C] | 27 | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
| Equivalent Thermal Conductivities [w/m-DEG C] | 0.1321 | 0.1574 | 0.1988 | 0.3074 | 0.3790 | 0.5679 | 0.8044 | 1.1264 |
Most preferred embodiment two: particle diameter is the mensuration of 5mm solid refuse Equivalent Thermal Conductivities
1, in the axial location of test specimen tube, insert diameter is 0.5mm nickel chromium triangle hot line, is arranging two thermopair measuring points respectively simultaneously, and ensure that two thermopair measuring points are on same sagittal plane from Call Center 3mm, 5mm place.
2, take 2.65kg solid refuse to be deposited at random in test specimen tube, load onto graphite gasket on the top of test specimen tube, cover cover, and hot line and thermopair are passed from the sealed tube cover, with serum cap, sealed tube is sealed.
3, discharge is connected with natural gas gathering system; Cover upper part is connected with circulating water device, and passes into recirculated cooling water; Hot line is connected with direct supply; Two K type thermopairs are connected with data acquisition processing system; Test specimen tube is connected with AC power.
4, when temperature in sample is consistent with fire box temperature, control fire box temperature and change by the straight line rule of 0.2 DEG C/min, from connection AC power, record data, writing time is 5min; After record, opening direct supply, is 3w to the power input of hot line, and from connection direct supply, record data, writing time is 5min; After record, close direct supply.
5, after specimen temperature reaches next temperature nodes 100 DEG C, insulation 1h; When specimen temperature in test specimen tube arrives after stable state, repeat step 4, experimentally data can calculate the solid refuse Equivalent Thermal Conductivities at acquisition 100 DEG C.
6, repeat step 4-5, the solid refuse Equivalent Thermal Conductivities at experimentally data calculating acquisition 200 DEG C, 300 DEG C, 400 DEG C, 500 DEG C, 600 DEG C, 700 DEG C can be distinguished.
7, reaction terminates, and closes all power supplys to stop heating, until taking out after solid refuse cooling in test specimen tube; The pyrolysis gas stored in emptying natural gas gathering system; Release recirculated water; Carry out data processing.
| Temperature [DEG C] | 15 | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
| Equivalent Thermal Conductivities [w/m-DEG C] | 0.3422 | 0.5614 | 0.7436 | 0.9853 | 1.3059 | 1.7316 | 2.2968 | 3.0476 |
The above is only preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (8)
1. the Analytical system of an Equivalent Thermal Conductivities, it is characterized in that, comprise test specimen tube, heating system, natural gas gathering system and data acquisition processing system, described test specimen tube comprises sample cylindrical shell and sample cover, described heating system comprises heating arrangement, D.C. regulated power supply and AC power, described natural gas gathering system comprises discharge and gas extractor, described data acquisition processing system comprises sniffer, data collector and data processing equipment, most high assay temperature 1000 DEG C, wherein, described sample cylindrical shell comprises heater element, described heater element is connected with described AC power, described sample cover comprises cover, lower cover and sealed tube, be connected with sealed tube by described discharge between described upper cover and described lower cover, and described discharge and described sealed tube run through described upper cover and described lower cover, packoff is provided with between described sealed tube and described sample cover, described heating arrangement and described sniffer pass from described packoff respectively by described sealed tube, described heating arrangement is connected with the described D.C. regulated power supply outside test specimen tube, described sniffer is connected with the described data collector outside test specimen tube, described gas extractor passes through described discharge from described test specimen tube internal gathering gas, the data analysis that described data processing equipment gathers described data collector.
2. the Analytical system of Equivalent Thermal Conductivities according to claim 1, it is characterized in that, the barrel of described sample cylindrical shell comprises heater element, heat-insulation layer and shell from inside to outside, described heating arrangement is arranged at the axial location of test specimen tube, and described sniffer is arranged on the position of described test specimen tube internal deviation test specimen tube axis.
3. the Analytical system of Equivalent Thermal Conductivities according to claim 1 and 2, is characterized in that, comprises water-circulating cooling device further, and described water-circulating cooling device is connected with described upper cover.
4. the Analytical system of Equivalent Thermal Conductivities according to claim 1 and 2, is characterized in that, described natural gas gathering system comprises gas quench system further, and described gas quench system is arranged between described discharge and described gas extractor.
5. the Analytical system of Equivalent Thermal Conductivities according to claim 1 and 2, is characterized in that, described heater element is high-temperature electric resistance furnace silk or Elema.
6. the Analytical system of Equivalent Thermal Conductivities according to claim 1 and 2, is characterized in that, is provided with graphite gasket between described sample cover and described sample cylindrical shell.
7. the Analytical system of Equivalent Thermal Conductivities according to claim 1 and 2, is characterized in that, described heating arrangement is hot line.
8. the Analytical system of Equivalent Thermal Conductivities according to claim 1 and 2, is characterized in that, described sniffer is two K type thermopairs, and described two K type thermopairs are positioned on the same sagittal plane centered by test specimen tube axis.
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| CN201420426653.1U CN204044093U (en) | 2014-07-30 | 2014-07-30 | A kind of Analytical system of Equivalent Thermal Conductivities |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198524A (en) * | 2014-07-30 | 2014-12-10 | 北京神雾环境能源科技集团股份有限公司 | System and method for measuring equivalent heat conductivity coefficient |
| CN106932725A (en) * | 2017-02-16 | 2017-07-07 | 福建福清核电有限公司 | A kind of batteries on-Line Monitor Device |
| CN107315030A (en) * | 2017-06-19 | 2017-11-03 | 北京交通大学 | Pyrolytic layer thermal conductivity measurement instrument and measuring method |
| CN108896606A (en) * | 2018-09-25 | 2018-11-27 | 国电环境保护研究院有限公司 | A kind of unstable state cylinder heat resource method temperature becomes effective thermal conductivity measurement device and method |
-
2014
- 2014-07-30 CN CN201420426653.1U patent/CN204044093U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198524A (en) * | 2014-07-30 | 2014-12-10 | 北京神雾环境能源科技集团股份有限公司 | System and method for measuring equivalent heat conductivity coefficient |
| CN104198524B (en) * | 2014-07-30 | 2016-10-05 | 北京神雾环境能源科技集团股份有限公司 | A kind of mensuration system and method for Equivalent Thermal Conductivities |
| CN106932725A (en) * | 2017-02-16 | 2017-07-07 | 福建福清核电有限公司 | A kind of batteries on-Line Monitor Device |
| CN107315030A (en) * | 2017-06-19 | 2017-11-03 | 北京交通大学 | Pyrolytic layer thermal conductivity measurement instrument and measuring method |
| CN107315030B (en) * | 2017-06-19 | 2019-09-03 | 北京交通大学 | Pyrolytic layer thermal conductivity measurement instrument and measurement method |
| CN108896606A (en) * | 2018-09-25 | 2018-11-27 | 国电环境保护研究院有限公司 | A kind of unstable state cylinder heat resource method temperature becomes effective thermal conductivity measurement device and method |
| CN108896606B (en) * | 2018-09-25 | 2024-02-06 | 国电环境保护研究院有限公司 | Device and method for measuring effective heat conductivity coefficient of temperature change by using unsteady cylindrical heat source method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141224 Effective date of abandoning: 20161005 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |