CN112629957A - Constant-speed sampling device of static pressure balance method - Google Patents
Constant-speed sampling device of static pressure balance method Download PDFInfo
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- CN112629957A CN112629957A CN202011372722.1A CN202011372722A CN112629957A CN 112629957 A CN112629957 A CN 112629957A CN 202011372722 A CN202011372722 A CN 202011372722A CN 112629957 A CN112629957 A CN 112629957A
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- 230000003068 static effect Effects 0.000 title claims abstract description 65
- 238000005070 sampling Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000000605 extraction Methods 0.000 claims abstract description 79
- 239000000779 smoke Substances 0.000 claims abstract description 66
- 239000013618 particulate matter Substances 0.000 claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 74
- 239000003546 flue gas Substances 0.000 claims description 74
- 239000007789 gas Substances 0.000 claims description 50
- 238000010276 construction Methods 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 claims 6
- 239000000523 sample Substances 0.000 description 53
- 239000003245 coal Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000755266 Kathetostoma giganteum Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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Abstract
The invention discloses a constant-speed sampling device of a static pressure balance method, which comprises a smoke sampler, a differential pressure gauge, an extraction power source, an extraction controller, a measuring chamber and a control system, wherein the smoke sampler comprises a smoke sampling pipe, a smoke static pressure pipe and a sample static pressure pipe, the smoke sampler is inserted into a flue, the smoke sampler is connected with the measuring chamber through a pipeline, a particulate matter monitor is arranged in the measuring chamber, the extraction power source is connected with the measuring chamber, and the smoke sampler is connected with the differential pressure gauge. According to the invention, the smoke static pressure pipe and the sample static pressure pipe are arranged in the smoke pipeline, the smoke static pressure pipe is communicated with the differential pressure gauge, and the control system can calculate according to the signal of the differential pressure gauge and adjust the working state of the extraction power source through the extraction controller, so that the static pressure of the sample gas in the smoke collector is changed to be consistent with the static pressure of the smoke gas, the purpose of sampling at constant speed can be realized more conveniently, and the smoke static pressure pipe can be operated by related workers conveniently.
Description
Technical Field
The invention relates to the technical field of flue gas sampling detection, in particular to a constant-speed sampling device adopting a static pressure balance method.
Background
The flue gas sampler is a common device in the current market, and is a device for measuring particulate matters by extracting the flue gas in a flue through a probe inserted into the flue and a power device. Because the humidity of flue gas in the flue is very big a bit now, in order to get rid of the influence of liquid water to particulate matter measurement, the concentration value of accurate measurement particulate matter must reduce the humidity of sample gas, with liquid water, restore into the gaseous state for real particulate matter in the gas can be measured by particulate matter detecting instrument. At present, the humidity of the sample gas is reduced mainly by adopting a heating method or a dilution method, and then the sample gas is matched with a corresponding particle detection instrument, so that the concentration of the particles of the extracted sample gas is finally converted into an intuitive numerical value for data analysis.
Through magnanimity retrieval, discover prior art, the publication number is CN104568505A, disclose a can realize on-spot type buggy sampling device of constant speed sample, including flat-head formula buggy constant speed sampling gun to and connect cyclone and the buggy collecting vessel at the sampling gun afterbody, the support arm lower extreme punches and passes the differential pressure survey buret of buggy sampling gun afterbody and clip the sampling gun outer wall, and the pulley has been installed to the support arm upper end, and the pulley rolls on supporting the track, supporting the track parallel laying at the sampling gun upside, during the sampling end of sampling gun inserted the sealed packing of graphite, connect ball valve and tube socket in order behind the sealed packing. Due to the adoption of the technical scheme, the coal powder sampling can be carried out according to the relevant regulations in the Power station coal mill and powder preparation system performance test DL/T-467-doping 2004 of the power standard, and the taken coal powder sample can truly reflect the coal powder fineness.
Most of the existing constant-speed sampling equipment adopts a dynamic pressure balance method to realize the effect of constant-speed sampling, the data to be measured is more, the requirement on the real-time performance of control is high, the actual operation is very complicated, the rapid and convenient detection is not facilitated, and the labor burden of related workers can be increased.
Disclosure of Invention
The present invention is directed to a constant-velocity sampling device using a static pressure balance method, which solves the above-mentioned problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a constant speed sampling device of static pressure balance method, includes flue gas sampler, differential pressure gauge, extraction power supply, extraction controller, measuring chamber and control system, flue gas sampler comprises flue gas sampling tube, flue gas static pressure pipe and sample static pressure pipe, inside flue gas sampler inserted the flue, flue gas sampler is connected with the measuring chamber through the pipeline, be provided with the particulate matter monitor in the measuring chamber, the extraction power supply is connected with the measuring chamber, flue gas sampler is connected with the differential pressure gauge. The control system is respectively connected with the differential pressure gauge and the extraction controller, and the extraction controller is connected with the extraction power source construction circuit.
Preferably, the extraction power source adopts a power device capable of generating negative pressure, such as an air pump or a jet pump, and the extraction power source pipeline, the measuring chamber and the flue gas sampler form a pipeline communicated with each other;
the extraction controller adopts a frequency converter or other control devices, the control system can control the extraction controller, and the working state and the power of the extraction power source are controlled by the extraction controller.
Preferably, the particulate matter monitor is installed in the measuring chamber, the air exhaust power source generates negative pressure, smoke in the flue is sucked through the smoke sampler and is transmitted to the measuring chamber.
Preferably, the flue gas static pressure pipe and the sample static pressure pipe are respectively connected to a differential pressure gauge, and signals of the differential pressure gauge are connected to a control system;
the control system controls the extraction controller, so that the extraction power source is controlled, the static pressure of the sample gas can be changed, the fed-back actual differential pressure delta P is obtained, the final delta P value is zero, and constant-speed sampling is realized.
Preferably, the calculation formula is as follows:
wherein v issIs the flue gas velocity, rhosIs the density of the flue gas, BaAt atmospheric pressure, kpFor pitot tube correction factor, tsIs the flue gas temperature, psIs the static pressure of the flue gas, pdFor dynamic pressure of flue gas, MsIs the molar mass of the flue gas.
Preferably, when the smoke pressure is P1 and the sample gas pressure is P2, the smokeDynamic pressure p of flue gas between gas and sample gasdWhen the pressure is equal to the equal value at the same sampling time, namely the pressure of the smoke and the pressure of the sample gas are equal, P is 2-P1dThe relative flow velocity between the smoke and the sample gas is 0, and constant-speed sampling can be realized.
Preferably, the constant-speed sampling workflow is as follows:
the smoke static pressure pipe and the sample static pressure pipe in the smoke sampler respectively measure the smoke pressure and the sample pressure, and the differential pressure gauge can compare the smoke pressure in the smoke static pressure pipe with the smoke pressure of the sample static pressure pipe and upload a pressure difference value to the control system;
the control system receives the numerical value uploaded by the differential pressure gauge, compares whether the smoke pressure P1 and the sample gas pressure P2 are equal, and if not, transmits a signal to the extraction controller, and the extraction controller transmits a signal to the extraction power source, controls the working state of the extraction power source and adjusts the output power of the extraction power source;
the extraction power source changes the output power and changes the air suction flow rate of the flue gas sampler after being fed back by the signal of the extraction controller, thereby changing the pressure of the sample gas;
after the power of the extraction power source is adjusted, the differential pressure gauge compares the flue gas pressure P1 with the sample gas pressure P2 in real time, the differential pressure delta P value of the flue gas pressure P1 and the sample gas pressure P2 is uploaded to the control system in real time, and the extraction power source is adjusted through feedback of the control system, so that the flue gas pressure P1 is equal to the sample gas pressure P2;
if the smoke pressure P1 is equal to the sample gas pressure P2, the static pressure balance between the smoke pressure and the sample gas pressure can be realized, and the constant-speed sampling can be realized.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the smoke static pressure pipe and the sample static pressure pipe are arranged in the smoke pipeline, the smoke static pressure pipe is communicated with the differential pressure gauge, the control system can calculate and adjust the working state of the extraction power source according to the signal of the differential pressure gauge, so that the static pressure of the sample gas in the smoke collector is changed to be consistent with the static pressure of the smoke gas, the constant-speed sampling is realized, compared with the traditional constant-speed sampling mode, the required collected data is less, the purpose of constant-speed sampling can be realized more conveniently, and the smoke static pressure pipe can be operated by related workers greatly conveniently.
Drawings
FIG. 1 is a schematic view of the configuration of the apparatus of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, five embodiments of the present invention are shown:
the first embodiment is as follows:
a constant-speed sampling device of a static pressure balance method comprises a flue gas sampler, a differential pressure gauge, an extraction power source, an extraction controller, a measuring chamber and a control system, wherein the flue gas sampler consists of a flue gas sampling tube, a flue gas static pressure tube and a sample static pressure tube;
the control system is respectively connected with the differential pressure gauge and the extraction controller, and the extraction controller is connected with the extraction power source construction circuit.
The extraction power source can adopt a power device which can generate negative pressure, such as an air pump or a jet pump, and the pipeline of the extraction power source, the observation chamber and the flue gas sampler form a communicated pipeline;
example two:
the extraction controller adopts a frequency converter or other control devices, the control system can control the extraction controller, and the working state and the power of the extraction power source are controlled by the extraction controller.
The particulate matter monitor is installed in the measuring chamber, and the extraction power supply produces the negative pressure, inhales the flue gas in the flue through the flue gas sampler to transmit to the measuring chamber in, particulate matter detector detects particulate matter concentration in the flue gas.
Example three:
the flue gas static pressure pipe and the sample static pressure pipe are respectively connected with a differential pressure gauge, and the signal of the differential pressure gauge is connected to a control system;
the control system controls the extraction controller, so that the extraction power source is controlled, the static pressure of the sample gas can be changed, the fed-back actual differential pressure delta P is obtained, the final delta P value is zero, and constant-speed sampling is realized.
The calculation formula is as follows:
wherein v issIs the flue gas velocity, rhosIs the density of the flue gas, BaAt atmospheric pressure, kpFor pitot tube correction factor, tsIs the flue gas temperature, psIs the static pressure of the flue gas, pdFor dynamic pressure of flue gas, MsIs the molar mass of the flue gas.
When the pressure of the flue gas is P1 and the pressure of the sample gas is P2, the dynamic pressure P of the flue gas between the flue gas and the sample gasdP2-P1, the pressure is equal at equal sampling, i.e. the pressure of the flue gas and the sample gas are equal, then PdThe relative flow velocity between the smoke and the sample gas is 0, and constant-speed sampling can be realized.
Example four:
the constant-speed sampling work flow is as follows:
the smoke static pressure pipe and the sample static pressure pipe in the smoke sampler respectively measure smoke pressure and sample air pressure, and the differential pressure gauge can compare the smoke pressure in the smoke static pressure pipe with the sample air pressure of the sample static pressure pipe and upload a pressure difference value to the control system;
the control system receives the numerical value uploaded by the differential pressure gauge, compares whether the smoke pressure P1 and the sample gas pressure P2 are equal, and if not, transmits a signal to the extraction controller, and the extraction controller transmits a signal to the extraction power source, controls the working state of the extraction power source and adjusts the output power of the extraction power source;
the extraction power source changes the output power and changes the air suction flow rate of the measuring chamber and the flue gas sampler after being fed back by the signal of the extraction controller, thereby changing the pressure of the sample gas;
after the power of the extraction power source is adjusted, the differential pressure gauge respectively compares the flue gas pressure P1 with the sample gas pressure P2 in real time, and uploads the differential pressure value delta P of the flue gas pressure P1 with the sample gas pressure P2 to the control system in real time, and the extraction power source is adjusted through feedback of the control system, so that the flue gas pressure P1 is equal to the sample gas pressure P2;
if the smoke pressure P1 is equal to the sample gas pressure P2, the static pressure balance between the smoke pressure and the sample gas pressure can be realized, and the constant-speed sampling can be realized.
Example five:
insert installation flue gas static pressure pipe and sample static pressure pipe in the flue gas pipeline, flue gas static pressure pipe and sample static pressure pipe are linked together the differential pressure gauge, control system can calculate and adjust the operating condition who extracts the power supply according to the signal of differential pressure gauge, thereby change the static pressure of sample gas among the flue gas collector and flue gas static pressure keep unanimous, realize the constant speed sampling, compare with traditional constant speed sampling mode, the data that need gather are still less, the purpose of realization constant speed sampling that can be more convenient, can be very big make things convenient for relevant staff to operate.
The working principle is as follows: the smoke sampler is inserted into the flue, the smoke static pressure pipe is communicated with the sample static pressure pipe through a differential pressure gauge, the working state of the extraction power source is calculated according to the signal of the differential pressure gauge and is adjusted through the extraction controller, so that the static pressure of the sample gas in the smoke collector is kept consistent with the static pressure of the smoke, and when the smoke pressure P1 and the sample gas pressure P2 are reached, the smoke dynamic pressure P between the smoke and the sample gasdP2-P1, the pressure is equal at equal sampling, i.e. the pressure of the flue gas and the sample gas are equal, then PdThe constant-speed sampling can be realized by taking the relative flow rate between the flue gas and the sample gas as 0, and compared with the traditional constant-speed sampling mode, the constant-speed sampling method has the advantages that less data need to be acquired, the constant-speed sampling can be realized more conveniently, and the operation of related workers can be greatly facilitated;
the flue gas sampler flows the flue gas to the measuring chamber through the negative pressure generated by the extraction power source, and the particulate matter detector detects the concentration of particulate matter in the flue gas.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The utility model provides a constant speed sampling device of static pressure balance method, includes flue gas sampler, differential pressure gauge, extraction power supply, extraction controller, measuring chamber and control system, its characterized in that: the smoke sampler is composed of a smoke sampling tube, a smoke static pressure tube and a sample static pressure tube, the smoke sampler is inserted into the flue, the smoke sampler is connected with a measuring chamber through a pipeline, a particulate matter monitor is arranged in the measuring chamber, the extraction power source is connected with the measuring chamber, and the smoke sampler is connected with a differential pressure gauge;
the control system is respectively connected with the differential pressure gauge and the extraction controller, and the extraction controller is connected with the extraction power source construction circuit.
2. The hydrostatic equilibrium constant velocity sampling apparatus of claim 1, wherein: the extraction power source can adopt a power device which can generate negative pressure, such as an air pump or a jet pump, and the extraction power source pipeline, the measuring chamber and the smoke sampler form a pipeline which is communicated;
the extraction controller can adopt a frequency converter or other control devices, and the control system can control the extraction controller, and the working state and the power of the extraction power source are controlled by the extraction controller.
3. The hydrostatic equilibrium constant velocity sampling apparatus of claim 1, wherein: the particulate matter monitor is installed in the measuring chamber, the extraction power supply produces the negative pressure, inhales the flue gas in the flue through the flue gas sampler to transmit to the measuring chamber in.
4. The hydrostatic equilibrium constant velocity sampling apparatus of claim 1, wherein: the flue gas static pressure pipe and the sample static pressure pipe are respectively connected into a differential pressure gauge, and signals of the differential pressure gauge are connected into a control system;
the control system controls the extraction controller, so that the extraction power source is controlled, the static pressure of the sample gas can be changed, the fed-back actual differential pressure delta P is obtained, the final delta P value is zero, and constant-speed sampling is realized.
5. The hydrostatic balance constant velocity sampling apparatus according to claim 4, wherein: the calculation formula is as follows:
wherein v issIs the flue gas velocity, rhosIs the density of the flue gas, BaAt atmospheric pressure, kpFor pitot tube correction factor, tsIs the flue gas temperature, psIs the static pressure of the flue gas, pdFor dynamic pressure of flue gas, MsIs the molar mass of the flue gas.
6. The hydrostatic equilibrium constant velocity sampling apparatus of claim 5, wherein: when the pressure of the flue gas is P1 and the pressure of the sample gas is P2, the dynamic pressure P of the flue gas between the flue gas and the sample gasdWhen the pressure is equal to the equal value at the same sampling time, namely the pressure of the smoke and the pressure of the sample gas are equal, P is 2-P1dThe relative flow velocity between the smoke and the sample gas is 0, and constant-speed sampling can be realized.
7. The hydrostatic equilibrium constant velocity sampling apparatus of claim 1, wherein: the constant-speed sampling work flow is as follows:
the smoke static pressure pipe and the sample static pressure pipe in the smoke sampler respectively measure smoke pressure and sample air pressure, and the differential pressure gauge can compare the smoke pressure in the smoke static pressure pipe with the sample air pressure of the sample static pressure pipe and upload a pressure difference value to the control system;
the control system receives the numerical value uploaded by the differential pressure gauge, compares whether the smoke pressure P1 and the sample gas pressure P2 are equal, and if not, transmits a signal to the extraction controller, and the extraction controller transmits a signal to the extraction power source, controls the working state of the extraction power source and adjusts the output power of the extraction power source;
the extraction power source changes the output power and changes the air suction flow rate of the measuring chamber and the flue gas sampler after being fed back by the signal of the extraction controller, thereby changing the pressure of the sample gas;
after the power of the extraction power source is adjusted, the differential pressure gauge respectively compares the flue gas pressure P1 with the sample gas pressure P2 in real time, and uploads the differential pressure value delta P of the flue gas pressure P1 with the sample gas pressure P2 to the control system in real time, and the extraction power source is adjusted through feedback of the control system, so that the flue gas pressure P1 is equal to the sample gas pressure P2;
if the smoke pressure P1 is equal to the sample gas pressure P2, the static pressure balance between the smoke pressure and the sample gas pressure can be realized, and the constant-speed sampling can be realized.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739758A (en) * | 2022-06-10 | 2022-07-12 | 南京波瑞自动化科技有限公司 | Adjustable speed sampling device of static pressure balance method |
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