CN103487661B - Atmosphere-variable high-temperature dust specific resistivity test device - Google Patents
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Abstract
The present invention relates to a kind of Atmosphere-variable high-temperature dust specific resistivity test device, including for heating and control thermoregulator temperature control system, for placing dust sample and realizing sample system, the measurement system controlled for voltage x current that HVDC powers and regulate system for realizing the atmosphere of different atmosphere test environment；Electric current is measured by the ammeter that several different accuracies are in parallel; and equipped with the bypass circuit of ammeter protection; gas through the buffering of porous material evenly into furnace interior; furnace atmosphere needed for formation; fire door is sealed by attaching type switch valve; and add sealing ring between fire door and casing, at fire door, be provided with cooling water recirculation system, it is ensured that test the safe and reliable of system.Present invention efficiently solves the measurement problem of different atmosphere dust specific resistance under high temperature, overcome conventional bug dust specific resistance testing device and can only test the defect of dust specific resistance in air atmosphere.
Description
Technical field
The present invention relates to a kind of ratio resistance testing device, especially relate to a kind of Atmosphere-variable high-temperature dust specific resistivity test device.
Background technology
Dust specific resistance refers to the resistance value of the dust layer of unit dust thickness, unit are, is the physical characteristic of dust, relevant with many factors such as dust moisture, chemical composition and temperature.Dust specific resistance has very important significance in electrostatic precipitation field, only could be by electrostatic precipitator efficient removal in the range of suitable electrostatic precipitation when dust specific resistance.
Nowadays coal resourcesization utilize becomes the research emphasis that high efficiency of energy utilizes, integrated gasification combined cycle plants (IGCC), Abstract Pressurized fluidized bed combustion combined cycle (PFBC) and coal Poly-generation etc. are the typical technologies that coal resourcesization utilize, high temperature electrostatic dedusting at present is IGCC, PFBC and the key technical problem of coal Poly-generation, therefore measures (particularly coal gasifier reducing atmosphere) dust high temperature under different atmosphere and is of great significance than resistance tool.In the systems such as IGCC, coal Poly-generation, flue gas atmosphere is by CO, H2、CH4Reducing atmosphere Deng gas composition, for guaranteeing high temperature electrostatic cleaner unit Effec-tive Function with this understanding, under test reducing atmosphere, dust specific resistance during different temperatures has necessity, to form reducing atmosphere device sealing is proposed the highest requirement under high temperature in heating furnace.Needing heating furnace box body tightness is carried out sophisticated design, this just contrasts electric resistance measuring apparatus and proposes new requirement.
The measurement of dust specific resistance is usually carried out in temperature adjustable electrode case, during measurement, dust sample is put between the high-low pressure electrode in electrode case, and the high-voltage output end of DC high-voltage power supply is linked with the high-pressure stage in electrode case, low pressure pole is then connected with current instruments, then measures at the temperature set and voltage.
Convention dust uses conventional insulating method than the insulation between high-field electrode part and the electrode box body of electric resistance measuring apparatus, utilizes some insulant (such as politef, porcelain bushing shell etc.) to implement insulation the most between the two.Research shows, most solid materials have negative temperature than resistance coefficient, and i.e. the highest it is lower than resistance for temperature, and this at high temperature gets over active reason mainly due to the ion of material itself, the motion of electronics.When temperature reaches 200～300 DEG C, its insulating properties starts to reduce, and the rising with temperature is increased by its fall, even such special high temperature insulating materials such as high-temperature ceramics, quartz glass, Fluororystal mica are no exception.Therefore, the maximum operating temperature of the equipment of dust specific resistance measurement the most both at home and abroad is only limitted to 200～300 DEG C.When temperature reaches more than 1000 DEG C, even if many insulant mechanical performances are not destroyed, but its electric property the most significantly declines, it could even be possible to become quasiconductor.Therefore, the insulating method that existing measurement apparatus is used obviously can not meet the measurement requirement under thousands of degrees Celsius of ultra-high temperature conditions.
Chinese patent CN102043094B discloses a kind of super-high-temperature high-voltage dust specific resistance measuring device, it includes electric heater, high-voltage DC power supply, high-temperature electric resistance furnace, low-field electrode, plate-like high-field electrode, low-field electrode hanging mechanism, high-field electrode support, described low-field electrode and plate-like high-field electrode are respectively positioned in high-temperature electric resistance furnace, low-field electrode is positioned at the top of plate-like high-field electrode, therebetween dust sample is placed, low-field electrode connects high-voltage DC power supply negative pole by low-field electrode hanging mechanism and micro-current detecting instrument, described high-field electrode support is fixed on the lower section of high-temperature electric resistance furnace and is connected with the positive pole of high-voltage DC power supply, its upper end withstands on the bottom of plate-like high-field electrode through the through hole on high-temperature electric resistance furnace base plate, it is isolated between high-field electrode support and high-temperature electric resistance furnace base plate.The present invention efficiently solves typical measuring arrangements can not take, because of solid insulating material decreasing insulating under the high temperature conditions, the problem effectively insulated to high-field electrode, can accurately measure ratio resistance, breakdown voltage and the leakage current of dust under 1000 DEG C of ultra-high temperature conditions.But, on the one hand, on the Rotary tray of the lower section that the high-field electrode support of this bug dust specific resistance testing device is fixed on high-temperature electric resistance furnace, and through high-temperature electric resistance furnace base plate, the design of this part-structure is loaded down with trivial details, and under high temperature, screw thread is easy to be aging impaired, is difficult to regulation,；On the other hand, this bug dust specific resistance testing device can only test dust specific resistance in air atmosphere, it is impossible to the real atmosphere residing for simulating dust, but different atmosphere is bigger on dust specific resistance impact；Meanwhile, under high temperature electrostatic cleaner unit operation conditions, the phosphorus content of dust is higher, and under high temperature air atmosphere, characteristic easily changes, and the dust specific resistance recorded in air atmosphere can not represent dust specific resistance during high temperature electrostatic dedusting actual motion.
Summary of the invention
For the deficiency overcoming prior art to exist, the invention provides and a kind of can measure high-temperature dust under different atmosphere and, than the test device of resistance, efficiently solve the test problem of different atmosphere dust specific resistance under high temperature.
A kind of Atmosphere-variable high-temperature dust specific resistivity test device, described device includes for heating and control thermoregulator temperature control system, for placing dust sample and realizing sample system, the measurement system controlled for voltage x current that HVDC powers and regulate system for realizing the atmosphere of different atmosphere test environment.
Preferably, described temperature control system includes electric furnace and temperature controller, described electric furnace includes fire door and body of heater, by attaching type switch seal between fire door and body of heater, and it is provided with sealing ring between fire door and body of heater, in order to prevent sealing ring the most aging, sealing property is deteriorated, and is provided with cooling water recirculation system at fire door；Described temperature controller includes that electric heater and temperature probe, described electric heater and temperature probe are arranged in electric furnace, and electric furnace is connected with temperature controller by electric heater and temperature probe.
Preferably, described sample system includes low-voltage ground electrode, high pressure circular electrode and high-voltage DC power supply, described low-voltage ground electrode, high pressure circular electrode is respectively positioned in electric furnace, low-voltage ground electrode is positioned at above high pressure circular electrode, the chassis placing dust sample is provided therebetween, low-voltage ground electrode is connected with ammeter by hitch, described high pressure circular electrode is arranged on high temperature resistant base, described high temperature resistant base is isolated by the base plate of insulating blanket with electric furnace, the outfan of high-voltage DC power supply passes the heat-insulation layer access high pressure circular electrode of electric furnace by transmission lever from electric furnace rear portion.
Preferably; described measurement system includes the ammeter voltmeter that different ranges are in parallel with several that several different ranges are in parallel; described ammeter is connected with earth terminal; for protective current table; the bypass circuit being connected with earth terminal it is additionally provided with on ammeter limit; low-voltage ground electrode is connected with bypass circuit by hitch, and voltmeter one end is connected with the outfan of high-voltage DC power supply, and the other end is connected with earth terminal.
Preferably, described atmosphere regulation system includes that air inlet and heat-insulation layer, described air inlet and heat-insulation layer are arranged at body of heater surrounding, and described heat-insulation layer is made up of porous insulation material, and gas penetrates into burner hearth by porous insulation material, it is ensured that air-flow uniform.
Preferably, being provided with Pressure gauge and gas outlet at described fire door, described electric furnace is connected with vacuum pump by gas outlet；Described attaching type switch is arranged on fire door surrounding.
Preferably, described hitch includes hanging beam and suspension rod, and described suspension beam is positioned at electric furnace and is connected with ammeter or earth terminal, and affixed in the middle part of described suspension rod one end and low-voltage ground electrode, the other end passes suspension beam；It is threaded connection between described high temperature resistant base and transmission lever.
Preferably, overlapping pipe insulation by corundum between described transmission lever and electric furnace, insulation distance is 60～70mm, and corundum sleeve outer diameter is 120mm, interstitial hole a diameter of 6～8mm.
Preferably, described low-voltage ground electrode exterior is additionally provided with annular ground electrode, is provided with the annular gap of 2～3mm between the two.Annular ground electrode purpose is to ensure that dust sample testing part field intensity is uniform.
Preferably, described measurement system includes three different ranges and the ammeter of parallel connection and two different ranges and the voltmeter of parallel connection.
Insulating blanket of the present invention can use the high alumina ceramic layer of 80mm, described transmission lever, high temperature resistant base all can use 2520 stainless steels.This material uses at 1100 DEG C will not occur high-temperature oxydation and deformation.
The present invention seals structure and uses attaching type fire door folder sealing ring to seal, the attaching type switch regulating fire door surrounding after shutting fire door is in poised state, fully seal in can ensureing stove, it is simultaneously provided with gas outlet and furnace pressure table in stove, can be bled from gas outlet formation vacuum by vacuum pump, the time kept according to vacuum in stove judges sealing property in casing, and is provided with cooling water system, at high temperature cools down fire door and sealing ring.
Atmosphere regulation system is supplied by gas cylinder distribution, is controlled well in flow entrance stove by effusion meter, is provided with pressure in Pressure gauge display body of heater at fire door.Owing to stove inner thermal insulating layer material is porous material, the gas entered there is certain cushioning effect, it is ensured that gas enters test casing uniformly and stably, it is to avoid flow velocity is excessive or instability causes dispels the problems such as dust sample.
Present configuration is simple, reasonable in design, efficiently solve the measurement problem of different atmosphere dust specific resistance under high temperature, overcome conventional bug dust specific resistance testing device and can only test dust specific resistance in air atmosphere, the defect of actual atmosphere can not be simulated, may be implemented in less than 1100 DEG C and measure dust specific resistance and breakdown voltage in various atmosphere；The present invention provides rationale data for high temperature electrostatic dedusting technology field, high temperature electrostatic cleaner unit in each field designs application and has important reference significance.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention；
1: body of heater, 2: fire door, 3: insulating blanket, 4-1: hang beam, 4-2: suspension rod, 5: low-voltage ground electrode, 6: annular ground electrode, 7: place the chassis of dust sample, 8: high pressure circular electrode, 9: high temperature resistant base, 10: transmission lever, 11: temperature probe, 12: heat-insulation layer, 13: temperature controller, 14: electric heater, 15: air inlet, 16: cooling water recirculation system, 17: Pressure gauge, 18: vacuum pump, 19 sealing gaskets；
Fig. 2 is to utilize apparatus of the present invention to test the ash sample repeated experiment result figure than resistance in air atmosphere；
Fig. 3 is the result figure utilizing the different coal gasification ash sample of apparatus of the present invention test than resistance；
Fig. 4 is to utilize under apparatus of the present invention test different atmosphere ash sample than the result figure of resistance.
Detailed description of the invention
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to this.
Embodiment 1
With reference to Fig. 1, a kind of Atmosphere-variable high-temperature dust specific resistivity test device, described device includes for heating and control thermoregulator temperature control system, for placing dust sample and realizing sample system, the measurement system controlled for voltage x current that HVDC powers and regulate system for realizing the atmosphere of different atmosphere test environment.
Described temperature control system includes electric furnace and temperature controller, described electric furnace includes fire door 2 and body of heater 1, by attaching type switch seal between fire door 2 and body of heater 1, and it is provided with sealing ring 19 between fire door 2 and body of heater 1, in order to prevent sealing ring the most aging, sealing property is deteriorated, and is provided with cooling water recirculation system 16 at fire door 2；Described attaching type switch is arranged on fire door 2 surrounding.Described temperature controller 13 includes that electric heater 14 and temperature probe 11, described electric heater 14 and temperature probe 11 are arranged in electric furnace, and electric furnace is connected with temperature controller 13 by electric heater 14 and temperature probe 11.
Described sample system includes low-voltage ground electrode 5, high pressure circular electrode 8 and high-voltage DC power supply 15, described low-voltage ground electrode 5, high pressure circular electrode 8 are respectively positioned in electric furnace, low-voltage ground electrode 5 is positioned at above high pressure circular electrode 8, the chassis 7 placing dust sample is provided therebetween, and low-voltage ground electrode 5 is connected with ammeter by hitch.In order to ensure that test section dust is in uniform electric field, described low-voltage ground electrode 5 is outside is additionally provided with annular ground electrode 6, is provided with the annular gap of 2～3mm between the two；Described hitch includes hanging beam 4-1 and suspension rod 4-2, described suspension beam 4-1 is positioned at electric furnace and is connected with ammeter or earth terminal, hangs the pressure values that beam action is to ensure that the dust surface that weight is defined in industry standard of whole low-voltage ground electrode.In the middle part of described suspension rod 4-2 one end and low-voltage ground electrode 5 affixed, the other end is connected through hanging beam 4-1 with ammeter or earth terminal.Described high pressure circular electrode 8 is arranged on high temperature resistant base 9, and described high temperature resistant base 9 is isolated by the base plate of the high alumina ceramic insulating blanket 3 of 80mm with electric furnace；The outfan of high-voltage DC power supply (H-TC) passes through the transmission lever 10 heat-insulation layer 12 from electric furnace rear portion through electric furnace and accesses high pressure circular electrode 8；It is threaded connection between high temperature resistant base 9 and transmission lever 10；Being overlapped pipe insulation by corundum between described transmission lever 10 and electric furnace, insulation distance is 60～70mm, and corundum sleeve outer diameter is 120mm, a diameter of 6mm of interstitial hole.Described transmission lever, high temperature resistant base all use 2520 stainless steels.
Described measurement system includes three different ranges and the ammeter of parallel connection and two different ranges and the voltmeter of parallel connection; described ammeter is connected with earth terminal; for protective current table; the bypass circuit being connected with earth terminal it is additionally provided with on ammeter limit; low-voltage ground electrode is connected with bypass circuit by hitch; voltmeter one end is connected with the outfan of high-voltage DC power supply (H-TC), and the other end is connected with earth terminal.
Described atmosphere regulation system includes that air inlet 15 and heat-insulation layer 12, described air inlet 15 and heat-insulation layer 15 are arranged at body of heater 1 surrounding, and described heat-insulation layer 15 is made up of porous insulation material, and gas penetrates into burner hearth by porous insulation material, it is ensured that air-flow uniform.
Being provided with Pressure gauge 17 and gas outlet at described fire door 2, described electric furnace is connected with vacuum pump 18 by gas outlet.
Negative dc high voltage of the present invention puts on equipped with on the chassis of dust, upper end low-voltage ground electrode ground connection, sample system is placed in high-temperature electric heating furnace, and electric furnace and temperature control system are used for controlling to test temperature by setting heating schedule, it is ensured that in test process, dust sample is in temperature constant state.In order to ensure safety and accuracy, electric current is measured by the ammeter that three different accuracies are in parallel, and equipped with the bypass circuit of ammeter protection.Gas is by porous insulating layer in air inlet entrance stove, through the buffering of porous insulation material evenly into furnace interior, furnace atmosphere needed for formation, fire door passes through attaching type switch seal, and it is equipped with sealing ring between fire door and body of heater, being provided with cooling water recirculation system at fire door, temperature is then opened cooling water and is cooled down sealing ring at fire door and fire door higher than 300 DEG C, it is ensured that test the safe and reliable of system.Seal Design fully meets various atmosphere requirements, particularly negative-pressure reduction atmosphere.
The present invention efficiently solves problem of oxidation when the higher dust specific resistance of phosphorus content under high temperature is measured, and may be implemented in dust specific resistance in less than 1100 DEG C various atmosphere, and the test of the higher dust specific resistance of phosphorus content.
Embodiment 2
Under air atmosphere, ash sample is than the repeated experiment of resistance test
With reference to Fig. 1, certain electrostatic precipitator in coal-fired power plant ash sample is placed on chassis 7, close fire door 2, air controls flow enter porous insulating layer in stove by air inlet well by effusion meter, through the buffering of porous insulation material evenly into furnace interior, furnace atmosphere needed for formation, is provided with pressure in Pressure gauge display body of heater at fire door.Owing to stove inner thermal insulating layer material is porous material, the gas entered there is certain cushioning effect, it is ensured that gas enters test casing uniformly and stably, it is to avoid flow velocity is excessive or instability causes dispels the problems such as dust sample.
Negative dc high voltage of the present invention puts on equipped with on the chassis of dust, upper end low-voltage ground electrode ground connection, sample system is placed in high-temperature electric heating furnace, and electric furnace and temperature control system are used for controlling to test temperature by setting heating schedule, it is ensured that in test process, dust sample is in temperature constant state.In order to ensure safety and accuracy, electric current is measured by the ammeter that three different accuracies are in parallel, and equipped with the bypass circuit of ammeter protection.Gas is by porous insulating layer in air inlet entrance stove, through the buffering of porous insulation material evenly into furnace interior, furnace atmosphere needed for formation, fire door passes through attaching type switch seal, and it is equipped with sealing ring between fire door and body of heater, being provided with cooling water recirculation system at fire door, temperature is then opened cooling water and is cooled down sealing ring at fire door and fire door higher than 300 DEG C, it is ensured that test the safe and reliable of system.
Utilize Atmosphere-variable high-temperature dust specific resistivity of the present invention test device to test certain electrostatic precipitator in coal-fired power plant ash sample under different temperatures in air atmosphere and compare resistance value, its result (experiment 1) as shown in table 1, and carried out repeated experiment (experiment 2), its result is as shown in table 2, the ash sample of twice experiment is than resistance value variation with temperature situation more as shown in Figure 2, the test of the ratio resistance under apparatus of the present invention can well realize high temperature (1100 DEG C) as can be seen from the results, and it is reproducible, the ash sample that can stably realize under low temperature and high temperature compares resistance test.
Table 1
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 2.09E+08 |
| 120 | 9.74E+08 |
| 150 | 1.00E+11 |
| 180 | 1.13E+12 |
| 210 | 7.71E+12 |
| 240 | 8.93E+12 |
| 270 | 1.02E+13 |
| 300 | 6.55E+12 |
| 400 | 2.19E+11 |
| 500 | 6.11E+09 |
| 600 | 4.25E+08 |
| 700 | 7.43E+07 |
| 800 | 9.31E+06 |
Table 1 test condition: atmosphere is air atmosphere, carries out pretreatment by ash sample before test, dries 90min at 105 DEG C, and during test, ambient temperature is 21 DEG C, and relative humidity is 45%, and ambient temperature breakdown voltage is 3010V.
Table 2
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 1.75E+08 |
| 120 | 6.57E+08 |
| 150 | 1.00E+11 |
| 180 | 1.40E+12 |
| 210 | 8.83E+12 |
| 240 | 1.28E+13 |
| 270 | 1.40E+13 |
| 300 | 6.14E+12 |
| 400 | 2.10E+11 |
| 500 | 6.16E+09 |
| 600 | 4.56E+08 |
| 700 | 8.86E+07 |
| 800 | 1.08E+07 |
Table 2 test condition: atmosphere is air atmosphere, carries out pretreatment by ash sample before test, dries 90min at 105 DEG C, and during test, ambient temperature is 18 DEG C, and relative humidity is 33%, and ambient temperature breakdown voltage is 3200V.
Embodiment 3
Different coal gasification ash samples compare resistance test
Utilize Atmosphere-variable high-temperature dust specific resistivity of the present invention test device that Huainan coal gasification ash sample and Yunnan coal gasification ash sample have been carried out in CO atmosphere its ratio test of resistance value under different temperatures, test process is with reference to embodiment 1 or 2, as shown in table 3 to the test result of Huainan coal gasification ash sample (coal gasification ash sample 1), as shown in table 4 to the test result of Yunnan coal gasification ash sample (coal gasification ash sample 2), the situation that two kinds of coal gasification ash samples vary with temperature than resistance value is as shown in Figure 3.Can be seen that from table 3, table 4 and Fig. 3, apparatus of the present invention all can realize good test effect for different coal gasification ash samples, the test than resistance of the ash sample (dust) under reducing atmosphere can be realized, efficiently solve the measurement problem of dust specific resistance in reducing atmosphere under high temperature, overcome conventional bug dust specific resistance testing device and can only test dust specific resistance in air atmosphere, the defect of actual atmosphere can not be simulated, may be implemented in less than 1100 DEG C and measure dust specific resistance in reducing atmosphere；The present invention provides rationale data for high temperature electrostatic dedusting technology field, high temperature electrostatic cleaner unit in each field designs application and has important reference significance.
Table 3
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 1.77E+09 |
| 120 | 1.54E+09 |
| 150 | 1.17E+09 |
| 210 | 4.42E+08 |
| 240 | 2.21E+08 |
| 270 | 1.38E+08 |
| 300 | 8.06E+07 |
| 400 | 1.53E+07 |
| 500 | 3.55E+06 |
| 600 | 1.89E+05 |
| 713 | 2.21E+04 |
Table 3 test condition: atmosphere is CO atmosphere, carries out pretreatment by ash sample before test, dries 2h at 105 DEG C, and during test, ambient temperature is 11 DEG C, and relative humidity is 60%, and ambient temperature breakdown voltage is 3290V.
Table 4
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 1.37E+10 |
| 120 | 1.02E+10 |
| 150 | 7.53E+09 |
| 180 | 6.37E+09 |
| 210 | 4.65E+09 |
| 240 | 2.94E+09 |
| 270 | 1.46E+09 |
| 300 | 5.23E+08 |
| 400 | 7.54E+07 |
| 500 | 5.86E+06 |
| 600 | 5.50E+05 |
| 700 | 1.50E+05 |
| 800 | 4.46E+04 |
Table 4 test condition: atmosphere is CO atmosphere, carries out pretreatment by ash sample before test, dries 2h at 105 DEG C, and during test, ambient temperature is 12 DEG C, and relative humidity is 71%, and ambient temperature breakdown voltage is 3070V.
Embodiment 4
Under different atmosphere, ash sample compares resistance test
Utilize the ratio resistance value that certain power plant's electrostatic precipitator ash sample is tested under different temperatures under different atmosphere by Atmosphere-variable high-temperature dust specific resistivity of the present invention test device, test process is with reference to embodiment 1 or 2, its test result in air atmosphere is as shown in table 5, test result in carbon dioxide atmosphere is as shown in table 6, test result in nitrogen atmosphere is as shown in table 7, and the test result in carbon monoxide atmosphere is as shown in table 8；In its different atmosphere, the contrast situation of test result is as shown in Figure 4；Can be seen that from the result shown in table 5, table 6, table 7, table 8 and Fig. 4, apparatus of the present invention can stably realize changing the flow of QI-blood atmosphere and high temperature test two major features, efficiently solve the measurement problem of different atmosphere dust specific resistance under high temperature, may be implemented in less than 1100 DEG C and measure dust specific resistance in various atmosphere.
Table 5
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 7.94E+09 |
| 120 | 2.79E+10 |
| 150 | 4.40E+10 |
| 180 | 3.72E+10 |
| 210 | 3.08E+10 |
| 240 | 2.54E+10 |
| 270 | 2.37E+10 |
| 300 | 1.93E+10 |
| 400 | 1.13E+10 |
| 500 | 7.81E+08 |
| 600 | 1.06E+08 |
| 700 | 5.14E+07 |
| 800 | 7.94E+06 |
Table 5 test condition: atmosphere is air atmosphere, carries out pretreatment by ash sample before test, dries 2h at 105 DEG C, and during test, ambient temperature is 30 DEG C, and relative humidity is 59%, and ambient temperature breakdown voltage is 8200V.
Table 6
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 4.06E+10 |
| 120 | 6.57E+10 |
| 150 | 1.06E+11 |
| 180 | 7.05E+10 |
| 210 | 6.11E+10 |
| 240 | 5.19E+10 |
| 270 | 3.30E+10 |
| 300 | 2.15E+10 |
| 400 | 1.37E+10 |
| 500 | 9.64E+08 |
| 600 | 1.11E+08 |
| 700 | 5.98E+07 |
| 800 | 9.74E+06 |
Table 6 test condition: atmosphere is carbon dioxide (CO2) atmosphere, before test, ash sample being carried out pretreatment, dry 2h at 105 DEG C, during test, ambient temperature is 30 DEG C, and relative humidity is 59%, and ambient temperature breakdown voltage is 8200V.
Table 7
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 3.29E+10 |
| 120 | 4.30E+10 |
| 150 | 5.72E+10 |
| 180 | 3.36E+10 |
| 210 | 3.16E+10 |
| 240 | 3.04E+10 |
| 270 | 2.39E+10 |
| 300 | 1.94E+10 |
| 400 | 1.18E+10 |
| 500 | 1.09E+09 |
| 600 | 1.61E+08 |
| 700 | 4.49E+07 |
| 800 | 8.15E+06 |
Table 7 test condition: atmosphere is nitrogen (N2) atmosphere, before test, ash sample being carried out pretreatment, dry 2h at 105 DEG C, during test, ambient temperature is 30 DEG C, and relative humidity is 59%, and ambient temperature breakdown voltage is 8200V.
Table 8
| Test temperature (DEG C) | Ash sample is than resistance value (Ω * cm) |
| 90 | 4.48E+10 |
| 120 | 5.63E+10 |
| 150 | 7.70E+10 |
| 180 | 3.22E+10 |
| 210 | 2.60E+10 |
| 240 | 2.78E+10 |
| 270 | 2.15E+10 |
| 300 | 1.46E+10 |
| 400 | 1.07E+10 |
| 500 | 1.07E+09 |
| 600 | 1.77E+08 |
| 700 | 6.70E+07 |
| 800 | 9.07E+06 |
Table 8 test condition: atmosphere is carbon monoxide (CO) atmosphere, carries out pretreatment by ash sample before test, dries 2h at 105 DEG C, and during test, ambient temperature is 30 DEG C, and relative humidity is 59%, and ambient temperature breakdown voltage is 8200V.
Claims (5)
1. Atmosphere-variable high-temperature dust specific resistivity test device, it is characterised in that: described device includes for heating and control thermoregulator temperature control system, for placing dust sample and realizing sample system, the measurement system controlled for voltage x current that HVDC powers and regulate system for realizing the atmosphere of different atmosphere test environment；
Described temperature control system includes that electric furnace and temperature controller, described electric furnace include fire door and body of heater, by attaching type switch seal between fire door and body of heater, and is provided with sealing ring between fire door and body of heater, is provided with cooling water recirculation system at fire door；Described temperature controller includes that electric heater and temperature probe, described electric heater and temperature probe are arranged in electric furnace；
Described sample system includes low-voltage ground electrode, high pressure circular electrode and high-voltage DC power supply, described low-voltage ground electrode, high pressure circular electrode is respectively positioned in electric furnace, low-voltage ground electrode is positioned at above high pressure circular electrode, the chassis placing dust sample is provided therebetween, low-voltage ground electrode is connected with ammeter by hitch, described high pressure circular electrode is arranged on high temperature resistant base, described high temperature resistant base is isolated by the base plate of insulating blanket with electric furnace, the outfan of high-voltage DC power supply passes the heat-insulation layer access high pressure circular electrode of electric furnace by transmission lever from electric furnace rear portion；
Overlapping pipe insulation by corundum between described transmission lever and electric furnace, insulation distance is 60～70mm, and corundum sleeve outer diameter is 120mm, interstitial hole a diameter of 6～8mm；
Described measurement system includes the ammeter voltmeter that different ranges are in parallel with several that several different ranges are in parallel, described ammeter is connected with earth terminal, the bypass circuit being connected with earth terminal it is additionally provided with on ammeter limit, low-voltage ground electrode is connected with bypass circuit by hitch, voltmeter one end is connected with the outfan of high-voltage DC power supply, and the other end is connected with earth terminal；
Described atmosphere regulation system includes that air inlet and heat-insulation layer, described air inlet and heat-insulation layer are arranged at body of heater surrounding, and described heat-insulation layer is made up of porous insulation material.
Atmosphere-variable high-temperature dust specific resistivity the most according to claim 1 test device, it is characterised in that: being provided with Pressure gauge and gas outlet at described fire door, described electric furnace is connected with vacuum pump by gas outlet；Described attaching type switch is arranged on fire door surrounding.
Atmosphere-variable high-temperature dust specific resistivity the most according to claim 1 test device, it is characterized in that: described hitch includes hanging beam and suspension rod, described suspension beam is positioned at electric furnace and is connected with ammeter, in the middle part of described suspension rod one end and low-voltage ground electrode affixed, the other end is connected through hanging beam with ammeter；It is threaded connection between described high temperature resistant base and transmission lever.
Atmosphere-variable high-temperature dust specific resistivity the most according to claim 1 test device, it is characterised in that: described low-voltage ground electrode exterior is additionally provided with annular ground electrode, is provided with the annular gap of 2～3mm between the two.
Atmosphere-variable high-temperature dust specific resistivity the most according to claim 1 test device, it is characterised in that: described measurement system includes three different ranges and the ammeter of parallel connection and two different ranges and the voltmeter of parallel connection.
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| CN201310404807.7A CN103487661B (en) | 2013-09-06 | 2013-09-06 | Atmosphere-variable high-temperature dust specific resistivity test device |
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| CN105987610A (en) * | 2015-02-04 | 2016-10-05 | 志圣工业股份有限公司 | Radiating unit and heating furnace with same |
| CN105467216A (en) * | 2016-01-12 | 2016-04-06 | 北京神雾环境能源科技集团股份有限公司 | Device and method of measuring block material structure specific resistance under high temperature environment |
| CN107228969A (en) * | 2017-06-15 | 2017-10-03 | 国网浙江义乌市供电公司 | Multipurpose electric flow table and control method with different measurement accuracy |
| CN108519520B (en) * | 2018-04-08 | 2023-09-26 | 华北电力大学（保定） | Dust specific resistance testing device capable of controlling temperature and adjusting atmosphere |
| CN110286301A (en) * | 2019-05-20 | 2019-09-27 | 广东电网有限责任公司 | A kind of simulated high-pressure cable intermediate joint interface creeping discharge test method |
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