CN105181743A - Gaseous low temperature heat transfer performance test system - Google Patents
Gaseous low temperature heat transfer performance test system Download PDFInfo
- Publication number
- CN105181743A CN105181743A CN201510737418.5A CN201510737418A CN105181743A CN 105181743 A CN105181743 A CN 105181743A CN 201510737418 A CN201510737418 A CN 201510737418A CN 105181743 A CN105181743 A CN 105181743A
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- China
- Prior art keywords
- cooling coil
- cavity
- gas
- liquid nitrogen
- generator
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- 238000011056 performance test Methods 0.000 title abstract 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000007789 gas Substances 0.000 claims abstract description 55
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 44
- 238000001816 cooling Methods 0.000 claims abstract description 42
- 238000012360 testing method Methods 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 230000008859 change Effects 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 238000004880 explosion Methods 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention provides a gas low-temperature heat exchange performance test system, which comprises a cavity 1, a liquid nitrogen generator 2, a cooling coil 3, a gas generator 4, a temperature sensor 7 and a liquid level meter 9, wherein the liquid nitrogen generator is arranged on the cavity; a pipeline connected with the liquid nitrogen generator extends into the cavity, and the liquid nitrogen generator is used for injecting liquid nitrogen into the cavity; the cooling coil is arranged in the cavity, a gas inlet of the cooling coil is connected with the gas generator, gas flowing through the cooling coil is discharged out of the cavity through a gas outlet of the cooling coil, and the part of the cooling coil is immersed under liquid nitrogen 8; a temperature sensor is arranged on the pipeline connected with the cooling coil; the liquid level meter is arranged on the cavity and used for detecting the liquid level of liquid nitrogen in the cavity. The heat transfer method of the invention is convection, thus avoiding the problem of large heat conduction resistance.
Description
Technical field
The present invention relates to field of industrial safety, particularly a kind of gas low temperature heat exchange property pilot system.
Background technology
China's coal bed gas resource rich reserves, development potentiality is huge.Many containing constituent of air such as nitrogen oxygen in the coal-seam gas of now exploiting, there is explosion hazard.Coal gas gasification is one of main application of coal-seam gas, in the purification phase of coal gas gasification flow process, in rectification column, along with the liquefaction gradually of methane is purified, rectification column top oxygen, nitrogen content increase gradually, and the content of methane is lower, therefore under the operating mode of rectification column " cryogenic high pressure ", methane may be within the scope of explosion limits, if meet fragmentary spark or the external heat source impact of remaining heavy hydrocarbon particle and dust collision generation, just likely causes combustion explosion.Therefore, in order to ensure the security of coal gas gasification flow process, must to the explosion limits of inflammable gas under condition of ultralow temperature such as grasp coalbed methane containing oxygen etc., and pressure, the isoparametric Changing Pattern of temperature in blast process.A lot of scholar and technician all study in flammable gas explosion characteristic, but under its research direction concentrates on inflammable gas normal temperature and pressure or high temperature and high pressure condition often, the research for the worst cold case relating to inflammable gas liquefaction is very few.
Flammable gas explosion characteristic test device and method under ultralow temperature, added refrigerating plant outside test tank, mainly measures the blast characteristics, minimum ignition energy etc. of inflammable gas under ultralow temperature.This device, because being equipped with filler in system, cannot adding coil pipe in test tank inside and lower the temperature, can only adopt the way of heat conduction, but thermal resistance is comparatively large, possibly cannot directly lower the temperature.
Summary of the invention
Given this, the invention provides a kind of gas low temperature heat exchange property pilot system.
The object of the invention is by such technical scheme realize, a kind of gas low temperature heat exchange property pilot system, comprises cavity 1, liquid nitrogen generator 2, cooling coil 3, gas generator 4, temperature sensor 7 and liquid level gauge 9; The pipeline be connected with liquid nitrogen generator extend in cavity, and liquid nitrogen generator is used for injecting liquid nitrogen in cavity; Described cooling coil is arranged in cavity, and the air intake opening of cooling coil is connected with gas generator, and the gas flowing through cooling coil is discharged to outside cavity by the gas outlet of cooling coil, and described cooling coil part is submerged to liquid nitrogen 8 times; The pipeline be connected with cooling coil is provided with temperature sensor; Described liquid level gauge is arranged on cavity, for the liquid level of liquid nitrogen in test chamber.
Further, the skin of described cavity is provided with heat-insulation layer 10.
Further, the pipeline connecting cooling coil and gas generator is provided with the first pressure regulator valve V1.
Further, the pipeline connecting cooling coil and gas generator is provided with flowmeter 5.
Further, the pipeline of connecting fluid nitrogenous generator and cavity is provided with the second pressure regulator valve V2.
Further, the pipeline be connected with the gas outlet of cooling coil is provided with the 3rd pressure regulator valve V3.
Further, the pipeline be connected with the gas outlet of cooling coil is provided with tensimeter 6.
Described cavity is provided with tensimeter.
Owing to have employed technique scheme, the present invention has following advantage:
Heat-transferring method of the present invention is convection current, avoids the difficult problem that thermal conduction resistance is large.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is structural drawing of the present invention.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
A kind of gas low temperature heat exchange property pilot system, comprises cavity 1, liquid nitrogen generator 2, cooling coil 3, gas generator 4, flowmeter 5, tensimeter 6, temperature sensor 7, liquid level gauge 9 and heat-insulation layer 10.
Cavity, as test container; Adopt the additional heat-insulation layer of stainless steel metal bucket.Metal bucket internal diameter does not have particular/special requirement, by diameter record after test objective reaches, just uses this metal bucket when moving into tunnel distribution.
Cooling coil: buying copper tube and pipe bender coiling voluntarily, copper pipe specification φ 10.It is 30 circles that the coiling number of turns is fixed tentatively, after success of the test, and record coil pipe span, the diameter of each circle.From liquid nitrogen bath out after pipeline section be incubated.
Flowmeter: flow range be 0 ~ 100L/min (0 DEG C, 101325Pa, lower with), require that the change of pressure, fluid components does not affect the accuracy of result, reading must have 3 significant figure.
Temperature sensor: thermal resistance, adopts expander to install.
Liquid nitrogen generator: the Dewar container for liquefied nitrogen bottle adopting conventional 175L.
Gas generator: comprise oxygen, methane, nitrogen cylinder, common 40L steel cylinder.
Pressure regulator valve V1: common reduction valve, with 2 tensimeters, the pressure before each tensimeter can measure valve and after valve, size is selected according to pipeline.
Pressure regulator valve V2, V3: adopt low temperature electric control valve, carry out type selecting according to pipeline.
Liquid level gauge: measure liquid nitrogen, range 0 ~ 800mm.
The pipeline be connected with liquid nitrogen generator extend in cavity, and liquid nitrogen generator is used for injecting liquid nitrogen in cavity; Described cooling coil is arranged in cavity, and the air intake opening of cooling coil is connected with gas generator, and the gas flowing through cooling coil is discharged to outside cavity by the gas outlet of cooling coil, and described cooling coil part is submerged to liquid nitrogen 8 times; The pipeline be connected with cooling coil is provided with temperature sensor; Described liquid level gauge is arranged on cavity, for the liquid level of liquid nitrogen in test chamber.
Described heat-insulation layer 10 is arranged at the skin of cavity; First pressure regulator valve V1 is arranged on the pipeline of connection cooling coil and gas generator; Flowmeter 5 is arranged on the pipeline of connection cooling coil and gas generator; Second pressure regulator valve V2 is arranged on the pipeline of connecting fluid nitrogenous generator and cavity; 3rd pressure regulator valve V3 is arranged on the pipeline that is connected with the gas outlet of cooling coil; Tensimeter 6 is arranged on the pipeline that is connected with the gas outlet of cooling coil; Described cavity is provided with tensimeter.
Use said system to carry out the test of low-temperature heat exchange performance, comprise the following steps:
(1) first airtight test.After device installs, at steel cylinder, place connects nitrogen cylinder, opens valve V1, V3, adopts nitrogen to purge, until after clean no-sundries, shutoff valve V3, continues through valve V1 and is filled with nitrogen, reach after 0.4MPaG until downstream pressure, close reduction valve, observe the situation of change of downstream pressure.After 30min, if manometric pressure drop is no more than 10KPa, can think that pilot system sealing is good.If there is leakage situation, encapsulation process is carried out to leak.Repetitive leakage detection, until qualified.
(2) change gas bomb into oxygen bottle, open valve V3, slowly open valve V1 and pass into oxygen, regulate the aperture of V1, V3, tensimeter and mass flowmeter after inspecting valve, make pressure stability at 0.173MPaG, stability of flow is at 48.88L/min.
(3) open valve V2, liquid nitrogen is put into liquid nitrogen bath, and observe the temperature sensor of precooling outlet, the temperature after oxygen is cooled is down to-170 DEG C.In temperature-fall period, pressure may change, and needs the aperture regulating V1, V3, ensures pressure and stability of flow.After temperature is down to desired value, keep V2 aperture constant.
(4) after temperature, pressure, flow reach desired value simultaneously, observe each sensor, instrument, these three numerical value are made to keep 3min constant, now, record this 3 data (T1, P1, Q1), and record the liquid level of liquid nitrogen bath, or make a mark (namely recording liquid level H1) at the liquid level place of liquid nitrogen bath, mark adopts crayon, outside liquid nitrogen bath, mark approximate location.If pressure cannot be stablized, then respectively after V1, add a surge tank voltage stabilizing empty Dewar flask of 175L (this surge tank adopt) before V3.
(5) close V2, change oxygen bottle into nitrogen cylinder, pipeline is replaced.
(6) change nitrogen cylinder into methane steel cylinder, open valve V3, slowly open valve V1 and pass into methane, regulate the aperture of V1, V3, tensimeter and mass flowmeter after inspecting valve, make pressure stability at 0.389MPaG, stability of flow is at 73.64L/min.
(7) step (3) and step (4) is repeated, after pending data stablizes 3min, T2, P2, Q2 that record cooling methane is corresponding, and record H2.
(8) off-test, closes V2, allows liquid nitrogen freely volatilize.Close valve V1, change nitrogen cylinder into, replace towards nitrogen.After being replaced, dismantle steel cylinder and other devices, move in tunnel and carry out low temperature gas explosion attribute testing.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. a gas low temperature heat exchange property pilot system, is characterized in that: comprise cavity (1), liquid nitrogen generator (2), cooling coil (3), gas generator (4), temperature sensor (7) and liquid level gauge (9);
The pipeline be connected with liquid nitrogen generator extend in cavity, and liquid nitrogen generator is used for injecting liquid nitrogen in cavity;
Described cooling coil is arranged in cavity, and the air intake opening of cooling coil is connected with gas generator, and the gas flowing through cooling coil is discharged to outside cavity by the gas outlet of cooling coil, and described cooling coil part is submerged under liquid nitrogen (8);
The pipeline be connected with cooling coil is provided with temperature sensor;
Described liquid level gauge is arranged on cavity, for the liquid level of liquid nitrogen in test chamber.
2. gas low temperature heat exchange property pilot system according to claim 1, is characterized in that: the skin of described cavity is provided with heat-insulation layer (10).
3. gas low temperature heat exchange property pilot system according to claim 1, is characterized in that: the pipeline of connection cooling coil and gas generator is provided with the first pressure regulator valve (V1).
4. gas low temperature heat exchange property pilot system according to claim 3, is characterized in that: the pipeline of connection cooling coil and gas generator is provided with flowmeter (5).
5. gas low temperature heat exchange property pilot system according to claim 1, is characterized in that: the pipeline of connecting fluid nitrogenous generator and cavity is provided with the second pressure regulator valve (V2).
6. gas low temperature heat exchange property pilot system according to claim 1, is characterized in that: the pipeline be connected with the gas outlet of cooling coil is provided with the 3rd pressure regulator valve (V3).
7. gas low temperature heat exchange property pilot system according to claim 6, is characterized in that: the pipeline be connected with the gas outlet of cooling coil is provided with tensimeter (6).
8. gas low temperature heat exchange property pilot system according to claim 1, is characterized in that: described cavity is provided with tensimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510737418.5A CN105181743A (en) | 2015-11-03 | 2015-11-03 | Gaseous low temperature heat transfer performance test system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510737418.5A CN105181743A (en) | 2015-11-03 | 2015-11-03 | Gaseous low temperature heat transfer performance test system |
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| Publication Number | Publication Date |
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| CN105181743A true CN105181743A (en) | 2015-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510737418.5A Pending CN105181743A (en) | 2015-11-03 | 2015-11-03 | Gaseous low temperature heat transfer performance test system |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896578A (en) * | 2020-07-28 | 2020-11-06 | 中国科学院近代物理研究所 | Superfluid helium dewar low-temperature constant-temperature testing device |
| CN112255142A (en) * | 2020-10-19 | 2021-01-22 | 中国科学院理化技术研究所 | Liquid phase cold accumulation working medium test system and method |
| CN113281377A (en) * | 2021-05-20 | 2021-08-20 | 中国人民解放军国防科技大学 | Device and method for measuring thermal dose of target object in explosion transient temperature field |
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2015
- 2015-11-03 CN CN201510737418.5A patent/CN105181743A/en active Pending
Patent Citations (6)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896578A (en) * | 2020-07-28 | 2020-11-06 | 中国科学院近代物理研究所 | Superfluid helium dewar low-temperature constant-temperature testing device |
| CN112255142A (en) * | 2020-10-19 | 2021-01-22 | 中国科学院理化技术研究所 | Liquid phase cold accumulation working medium test system and method |
| CN113281377A (en) * | 2021-05-20 | 2021-08-20 | 中国人民解放军国防科技大学 | Device and method for measuring thermal dose of target object in explosion transient temperature field |
| CN113281377B (en) * | 2021-05-20 | 2021-12-10 | 中国人民解放军国防科技大学 | Device and method for measuring thermal dose of target object in explosion transient temperature field |
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Application publication date: 20151223 |