CN202994904U - Apparatus for measuring working condition dust specific resistance - Google Patents
Apparatus for measuring working condition dust specific resistance Download PDFInfo
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- CN202994904U CN202994904U CN 201220590660 CN201220590660U CN202994904U CN 202994904 U CN202994904 U CN 202994904U CN 201220590660 CN201220590660 CN 201220590660 CN 201220590660 U CN201220590660 U CN 201220590660U CN 202994904 U CN202994904 U CN 202994904U
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- wire netting
- specific resistance
- working condition
- upper hopper
- funnel
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Abstract
The utility model discloses an apparatus for measuring working condition dust specific resistance. The apparatus comprises an upside-down upper funnel and a lower funnel inserted into the funnel part of the upper funnel, the tip part of the upper funnel is provided with a sampling pipe extended into an electric field, the tip part of the lower funnel is provided with a suction pump, a tiled lower metal net and a tiled upper metal net are arranged between the lower funnel and the bottom of the upper funnel, the lower metal net and the upper metal net are respectively provided with a wire connected with a megger, the other side of the lower metal net not facing the upper metal net is provided with a filter membrane, and the bore diameter of the upper metal net is more than that of the lower metal net. The apparatus for measuring working condition dust specific resistance is simple in structure, easy to assembly, low in cost, reliable in collecting and sampling mode, and strong in practicability.
Description
Technical field
The utility model belongs to the dedusting technology field, specifically refers to a kind of apparatus for measuring working condition dust specific resistance.
Background technology
Dust specific resistance is an index weighing the dust electric conductivity.Dust specific resistance is numerically equal to the resistance value of dust when unit thickness of unit area.The ratio resistance of dust layer, to selecting and to design electric precipitator very important, it not only affects the dust-collecting efficiency of electric precipitator, but also the power of dust agglomeration on pole plate is changed.
People study dust specific resistance, at first from the laboratory.Be namely with dust from on-site sampling, take in the specific device in laboratory, control artificially its temperature, humidity and smoke components simulate field condition, measure dust specific resistance and Changing Pattern thereof.
But the residing environment of ash sample and actual conditions are different sometimes.For example: in boiler fly ash, have sulphur to exist in flue gas, this ratio resistance to flying dust has a great impact.Also have, the ash sample that takes out from the scene is along with the increase of time, also some physics can appear, chemical change, and make dust that " aging " occur, so measure at the scene than resistance, close to time of day, the data that record are just more true and reliable due to its residing environment.At the initial stage forties, the measurement of on-the-spot dust specific resistance has for the first time been done by the U.S..After World War II, European and American countries industry has had development more rapidly.The electric precipitator technology obtains paying attention to widely and using.Other country has also developed multi-form on-the-spot dust specific resistance determinator.
The on-the-spot dust specific resistance analyzer that comes into operation both at home and abroad is summed up, and by its dust collection manner, nothing more than two kinds: a kind of is the mechanical type control of dust, and a kind of is electrostatic control of dust.
The typical way of mechanical type control of dust is: sampling pipe is put into flue, extract ash-laden gas with the isokinetic sampling and enter Whirlwind cyclone, utilize centrifugal force that the dust separation in flue gas is collected, fall into the storage ash cylinder of bottom, storage ash cylinder has two electrodes, in sampling process, constantly the ash cylinder of rapping Whirlwind cyclone, make the ash in storage ash cylinder form certain packing.In whole sampling process, as far as possible often measure the resistance in storage ash cylinder.
The method of electrostatic control of dust is according to the principle design of electrostatic precipitator basically.Main device is a high-voltage power supply and pair of electrodes, and typical electrode is that a probe is to a disk.When high pressure was applied between two plates, pin-circle electrode had formed an electric field, and dust-contained airflow is by this district, and dust is captured down, and when collecting the ash sample of adequate thickness, can measure.
Being compared as follows of above-mentioned two kinds of sample modes:
The advantage of mechanical type control of dust is to adopt low-tension supply, and the thickness of dust layer can be determined by the size of measuring cylinder; Whether shortcoming is to be difficult to fill up in judgement sampling cylinder, and dust density can not be reappeared, and the granularity of dust that main is collects even the dust catching efficiency of Whirlwind cyclone reaches 97%, adopts the isokinetic sampling can't guarantee that also the dust size that captures is consistent with reality without representativeness.
The advantage of Electrostatic collection mode is, the mechanism of dust catching is identical with electric precipitator, the electric phenomenon that occurs in the ratio resistance value that records and electric precipitator is consistent usually, shortcoming be capture dust need high voltage and the time longer, to repeatedly measure and to obtain authentic data, the powder footpath that captures dust is representative poor, especially works as dust specific resistance 10
5--10
10In the time of beyond ohmcm, difference is more outstanding.
Above-mentioned two class specific resistance testers although dust collection manner is different, all have the shortcoming that captures the representative difference of dust size, and this will make measurement result produce certain error.
Summary of the invention
The purpose of this utility model is to provide a kind of apparatus for measuring working condition dust specific resistance according to above-mentioned deficiency, utilize this device can immediately read dust specific resistance value under working condition, and sampling is reliable.
The utility model is achieved by the following technical solution:
A kind of apparatus for measuring working condition dust specific resistance, it is characterized in that: this device comprises the upper hopper of back-off and inserts the lower funnel of the section of bucket in upper hopper, the upper hopper bottle neck is provided with sampling pipe, sampling pipe passes in electric field, lower funnel bottle neck is provided with aspiration pump, be provided with lower wire netting and the upper wire netting of tiling between at the bottom of described lower funnel and upper hopper bucket, lower wire netting is respectively equipped with wire with upper wire netting and jointly is connected with tramegger, wherein descend wire netting also to be provided with filter membrane with respect to the opposite side of upper wire netting, described upper wire netting aperture is greater than the aperture of lower wire netting.
Preferably, described wire netting and the filter membrane annular briquetting by the outside, lower funnel oral area edge and the lower funnel oral area edge of wherein descending compresses, and upper wire netting is by interior ring and the annular briquetting compression of annular briquetting opposite side, at the bottom of described interior ring is fixed on the upper hopper bucket.
Preferred, described interior ring and upper hopper bucket section are bolted.
Preferred, described lower funnel edge of opening is step-like, and the inboard is provided with flange, and annular briquetting is coordinate with it step-like, and lower wire netting is between the flange and annular briquetting briquetting of lower funnel edge of opening.Such structure can prevent lower wire netting displacement.
Preferred, be provided with the outer shroud that is fixed at the bottom of the upper hopper bucket between the described interior ring outside and upper hopper bucket section, the outer shroud height is greater than interior ring.Such structure can prevent the wire netting displacement.
Preferred, described outer shroud and upper hopper bucket section are bolted.
Preferred, described lower funnel, upper hopper annular briquetting, interior ring and outer shroud are insulating material.
The utility model is according to the disk ratio juris, and a kind of of design can capture powder sample, the measurement mechanism that can measure simultaneously again efficiently.One deck filter membrane and double layer of metal net have been installed in device.This double layer of metal net is equivalent to two rosettes, and they insulate by annular briquetting, the Intranet of insulation each other, as teflon, and pottery or quartz ring.The thickness of annular briquetting, Intranet is exactly the height of measuring dust layer, can select according to the height of dust concentration.General thick 1.5 to 4 millimeters of interior ring, usual thickness is 2 millimeters, wire netting also can be selected different materials, the first layer metal mesh eyes is larger, can allow all dust that will pass through not to be delayed at outside wire netting, the eyelet of second layer metal net is less, and in order to collect dust and to prevent that it from passing, the back also will add the last layer filter membrane.
The sampling determination of this device partly is installed in a sampling head, and it is equivalent to the sampling leakage head of general flue dust analyzer, and an end connects the sampling mouth of different size, and the other end is connected with aspiration pump.During mensuration, sampling head is put in flue, then started aspiration pump, the bleeding regulating flow is to isokinetic sampling's flow.Through certain hour, the packed layer between the double layer of metal net is collected full dust, measures dust layer resistance with tramegger.In fact, sampling beginning can be observed, and, namely shows to have collected full dust between wire netting by being disconnected to when being stabilized to gradually certain numerical value when the gauge outfit indication, and these data are again through calculating, the ratio resistance that can obtain measuring.
Of the present utility model simple in structure, assembling is easily carried out, and cost is low, and it is reliable to collect sample mode, has very strong practicality.
Description of drawings
Fig. 1 is the utility model structural representation;
Sampling pipe, 2. the sampling mouth, 3. upper hopper, 4. descend funnel, 5. annular briquetting, 6. interior ring, 7. outer shroud, 8. bolt, 9. go up wire netting, 10. descend wire netting, 11. flanges.
Embodiment
Further illustrate the utility model below in conjunction with accompanying drawing:
As shown in Figure 1, described device comprises the upper hopper 3 of back-off and inserts the lower funnel 4 of the section of bucket in upper hopper 3, and upper hopper 3 bottle necks are provided with sampling pipe 1, and sampling pipe 1 passes in electric field, and the dust that gather in electric fields by sampling mouth 2.Lower funnel 4 bottle necks are provided with aspiration pump (not marking in figure), described lower funnel 4 and upper hopper 3 buckets are provided with wire netting 9 on the lower wire netting and 10 of tiling at the end, lower wire netting 10 is respectively equipped with wire with upper wire netting 9 and jointly is connected with tramegger, wherein descend wire netting 10 also to be provided with filter membrane (not marking in figure) with respect to the opposite side of upper wire netting 9, described upper metal 9 screen distances are greater than the aperture of lower wire netting 10.Lower wire netting 10 and the filter membrane annular briquetting 5 by lower funnel 4 outsides, oral area edge and lower funnel 4 oral area edges compress, and upper wire netting 9 compresses with annular briquetting 5 by the interior ring 6 of annular briquetting 5 opposite sides, and described interior ring 6 is fixed on the 3 bucket ends of upper hopper.Lower funnel 4 edge of opening are step-like, and the inboard is provided with flange 11, and annular briquetting 5 is coordinate with it step-like, and lower wire netting 10 is between the flange 11 and annular briquetting 5 of lower funnel 4 edge of opening.Be provided with between interior ring 6 outsides and upper hopper 3 bucket sections and be fixed in the upper hopper outer shroud 7 at the 3 bucket ends, outer shroud 7 height are greater than interior ring 6.Described outer shroud 7 and upper hopper 3 bucket sections are fixing by bolt 8.
The utility model is put into the electric field inner flue to this device when measuring; then start aspiration pump; the isokinetic sampling is to the full dust of the packed layer collection between the double layer of metal net, then with the ratio resistance between tramegger measurement dust layer, after having surveyed a sample; the mouth 2 of sampling is dismantled; change filter membrane, clean the surplus ash of double layer of metal net with water, reinstall to do for the second time and measure; according to the data that tramegger records, can obtain the ratio resistance value of working condition dust by calculating.
Computing formula is as follows:
In formula: ρ-than resistance value (ohmcm)
The indication resistance (ohm) of R-tramegger
F-wire netting area (centimetre
2)
Distance between H-double layer of metal net (centimetre)
K-metal grill coefficient
The metal grill coefficient compares test for the disk with same diameter, because the ratio resistance test chamber testing standard of China is pressed the operation of disk method, through the several times test, after finding consistent rule, determine the metal grill coefficient, variable R, obtain than resistance value reliable results very soon during mensuration.
Claims (7)
1. apparatus for measuring working condition dust specific resistance, it is characterized in that: this device comprises the upper hopper of back-off and inserts the lower funnel of the section of bucket in upper hopper, the upper hopper bottle neck is provided with sampling pipe, sampling pipe passes in electric field, lower funnel bottle neck is provided with aspiration pump, be provided with lower wire netting and the upper wire netting of tiling between at the bottom of described lower funnel and upper hopper bucket, lower wire netting is respectively equipped with wire with upper wire netting and jointly is connected with tramegger, wherein descend wire netting also to be provided with filter membrane with respect to the opposite side of upper wire netting, described upper wire netting aperture is greater than the aperture of lower wire netting.
2. apparatus for measuring working condition dust specific resistance according to claim 1, it is characterized in that: described wire netting and the filter membrane annular briquetting by the outside, lower funnel oral area edge and the lower funnel oral area edge compression wherein descended, upper wire netting compresses by interior ring and the annular briquetting of annular briquetting opposite side, at the bottom of described interior ring is fixed on the upper hopper bucket.
3. apparatus for measuring working condition dust specific resistance according to claim 2 is characterized in that: described interior ring and upper hopper bucket section are bolted.
4. apparatus for measuring working condition dust specific resistance according to claim 2, it is characterized in that: described lower funnel edge of opening is step-like, the inboard is provided with flange, and annular briquetting is coordinate with it step-like, and lower wire netting is between the flange and annular briquetting of lower funnel edge of opening.
5. apparatus for measuring working condition dust specific resistance according to claim 2 is characterized in that: be provided with the outer shroud that is fixed at the bottom of the upper hopper bucket between the described interior ring outside and upper hopper bucket section, the outer shroud height is greater than interior ring.
6. apparatus for measuring working condition dust specific resistance according to claim 5 is characterized in that: described outer shroud and upper hopper bucket section are bolted.
7. apparatus for measuring working condition dust specific resistance according to claim 2, it is characterized in that: described lower funnel, upper hopper annular briquetting, interior ring and outer shroud are insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220590660 CN202994904U (en) | 2012-11-12 | 2012-11-12 | Apparatus for measuring working condition dust specific resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220590660 CN202994904U (en) | 2012-11-12 | 2012-11-12 | Apparatus for measuring working condition dust specific resistance |
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| Publication Number | Publication Date |
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| CN202994904U true CN202994904U (en) | 2013-06-12 |
Family
ID=48566073
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220590660 Expired - Lifetime CN202994904U (en) | 2012-11-12 | 2012-11-12 | Apparatus for measuring working condition dust specific resistance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487661A (en) * | 2013-09-06 | 2014-01-01 | 浙江大学 | Atmosphere-variable high-temperature dust specific resistivity testing device |
| CN106324348A (en) * | 2016-07-19 | 2017-01-11 | 华北电力大学（保定） | Straight ash-loading type dust specific resistance on-line measuring device |
| CN107449968A (en) * | 2017-07-31 | 2017-12-08 | 浙江菲达环保科技股份有限公司 | Flying dust operating mode ratio resistance and experiment ratio resistance measure device |
-
2012
- 2012-11-12 CN CN 201220590660 patent/CN202994904U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487661A (en) * | 2013-09-06 | 2014-01-01 | 浙江大学 | Atmosphere-variable high-temperature dust specific resistivity testing device |
| CN103487661B (en) * | 2013-09-06 | 2016-08-03 | 浙江大学 | Atmosphere-variable high-temperature dust specific resistivity test device |
| CN106324348A (en) * | 2016-07-19 | 2017-01-11 | 华北电力大学（保定） | Straight ash-loading type dust specific resistance on-line measuring device |
| CN107449968A (en) * | 2017-07-31 | 2017-12-08 | 浙江菲达环保科技股份有限公司 | Flying dust operating mode ratio resistance and experiment ratio resistance measure device |
| CN107449968B (en) * | 2017-07-31 | 2023-05-05 | 浙江菲达环保科技股份有限公司 | Fly ash working condition specific resistance and experimental specific resistance measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130612 |