CN112611611A - Smoke constant-speed sampling device with temperature compensation function - Google Patents
Smoke constant-speed sampling device with temperature compensation function Download PDFInfo
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- CN112611611A CN112611611A CN202011364286.3A CN202011364286A CN112611611A CN 112611611 A CN112611611 A CN 112611611A CN 202011364286 A CN202011364286 A CN 202011364286A CN 112611611 A CN112611611 A CN 112611611A
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- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
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Abstract
The invention discloses a constant-speed flue gas sampling device with temperature compensation, which comprises a flue gas sampler, a sample analysis structure, a driving structure and a control system, wherein the flue gas sampler consists of a flue gas sampling pipe, a flue gas flow velocity instrument and a flue gas temperature instrument; the sample analysis structure consists of a sample gas flow velocity instrument, a sample gas temperature instrument and a particulate matter detector, and the particulate matter detector is provided with a measurement chamber; the driving structure consists of an extraction power source and an extraction controller, wherein the extraction power source can be an air pump and a jet pump, and the extraction controller can be a frequency converter. The invention measures the temperature of the smoke and the sample gas, calculates the theoretical air extraction amount after temperature compensation, obtains the theoretical sample airflow speed S2 during constant-speed sampling, adjusts the extraction controller, obtains the actual sample airflow speed S fed back, and makes the sample airflow speed S equal to S2, thereby realizing constant-speed sampling with temperature compensation and ensuring that the particulate matter detector accurately measures the particulate matter content in the smoke through the measuring chamber.
Description
Technical Field
The invention relates to the technical field of flue gas sampling equipment, in particular to a constant-speed sampling device with temperature compensation.
Background
The smoke sampler is a common device in the market at present, and is a device for measuring particulate matters by extracting smoke in a flue through a probe inserted into the flue and a power device. Because the humidity of the flue gas in the existing flue is very high, in order to eliminate the influence of liquid water on the measurement of the particulate matters and accurately measure the concentration value of the particulate matters, the humidity of the sample gas must be reduced. The liquid water is reduced to be in a gaseous state, so that real particles in the gas can be measured by a particle detection 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.
However, in the current method, the actual smoke sampling is mostly non-uniform sampling. However, in the case of gas sampling, constant velocity sampling is more advanced than non-constant velocity sampling, and is a necessary condition for obtaining an accurate value of the concentration of particulate matter in the flue. Meanwhile, the sample gas is heated before measurement, so that the temperature of the sample gas is different from the temperature of the flue gas, and the volume difference between the sample gas and the flue gas is caused by the heated expansion of the gas. In order to accurately measure the concentration value of the smoke particles, the invention provides a method for heating type smoke constant-speed sampling with temperature compensation, which calculates and compensates through real-time temperature measurement and changes the extraction capacity of an extraction power source so as to achieve the aim of constant-speed sampling.
The current particulate matter constant-speed sampling device can heat the sample gas for accurate data measurement before the sample gas is measured. However, constant-speed sampling cannot be completely realized without temperature compensation because the volume of the gas at different temperatures is not a fixed value, and the volume changes more when the temperature difference is larger.
The current particulate matter constant-speed sampling device has no temperature measurement, and the temperature of sample gas and the temperature of smoke gas during measurement are not compared. Such sampling errors cannot be eliminated and errors will be introduced for subsequent data measurements.
Disclosure of Invention
The present invention is directed to a constant-speed sampling device with temperature compensation to solve the above-mentioned problems.
In order to achieve the purpose, the invention provides the following technical scheme: a constant-speed sampling device with temperature compensation comprises a flue gas sampler, a sample analysis structure, a driving structure and a control system, wherein the flue gas sampler comprises a flue gas sampling pipe, a flue gas flow velocity meter and a flue gas temperature meter;
the control system is respectively connected with the smoke sampling structure, the sample analysis structure and the driving structure building circuit, the smoke sampling structure is communicated with the sample analysis structure, and the driving structure is communicated with the sample analysis structure.
Preferably, the flue gas sampling tube is arranged in the flue, the flue gas velocity meter and the flue gas temperature meter both penetrate through the flue, and the flue gas velocity meter and the flue gas temperature meter are both arranged in the flue;
the flue gas circulates along the inside of the flue, enters the inside through the flue gas sampling tube, and the flue gas passes through a flue gas velocity meter and a flue gas temperature meter, the flue gas velocity meter and the flue gas temperature meter measure the velocity of flow and the temperature of the flue gas respectively, and upload the measured data to the control system.
Preferably, the driving structure generates negative pressure through the air suction pump, so that negative pressure is formed in the measuring chamber, and the smoke in the smoke sampling tube is sucked into the measuring chamber;
the sample gas flow velocity instrument is inserted between the smoke sampling pipe and the measuring chamber, can measure the flow velocity of smoke circulating in the sample sampling pipe, and can measure the temperature of the sample smoke in the measuring chamber by the sample gas temperature instrument;
the particle detector can be used for detecting particles in smoke in the measuring chamber, and the sample air flow velocity instrument and the sample air temperature instrument can upload measured data to the control system.
Preferably, the control system analyzes and calculates the data to obtain a final result, and displays the value in real time through a display screen;
the control system is connected with the extraction controller, and the extraction controller can be controlled to operate through the control system, so that the operating power of the air extraction pump is indirectly controlled.
Preferably, when an air pump is used in the detection process, the measured pressure P1 of the sample device, the pressure P2 of the heated sample device, the volume V1 of the sample gas, the thermodynamic temperature T1 of the flue, the volume V2 of the heated sample, and the thermodynamic temperature T1 of the measurement chamber;
the formula P1 × V1/T1 ═ P2 × V2/T2 for the sample gas collection, and P2 × V2 ═ P1 × V1 × T2/T1 can be derived; the temperature t1 is measured by matching with the flue gas and the temperature t2 of the sample gas in the measuring chamber to obtain
Since P1 is P2 during isokinetic sampling, this results in
Wherein t1 is the measured temperature of the flue, t2 is the measured temperature of the measuring chamber, S1 is the measured flow rate of the flue, S2 is the theoretical value of the flow rate required by the constant-speed sampling of the sample at the flow rate measuring point, m1 is the cross-sectional area of the flue gas sampling tube, and m2 is the cross-sectional area of the flow rate measuring point;
the control system needs to track the change of S1 according to S2 after compensation calculation so that the difference between the final extracted actual flow rate S and S2 is zero, i.e., S2-S is 0.
Preferably, when the jet pump is used in the detection process, the performance fitting quasi-two-dimensional theoretical calculation formula of the jet pump, in combination with a certain mass ideal gas state equation, is: p V/T is constant, where P is the same value, thus calculated for the volume of sample gas collected as P1V 1/T1P 2V 2/T2;
since P1 is P2 at the time of constant-speed sampling, V2 is V1T 2/T1,
since the cross-sectional area of the sampling port of the sampler is constant, the cross-sectional area can be deduced
According to a jet pump power equation PC/P0-0.1147 (3.0365-Qs/Q0), the difference between the final extracted actual flow speed S and S2 is 0 by controlling the volume flow rate of the power gas according to a formula S1-S2-Qs/SJ, wherein the extraction pressure PC, the power gas pressure P0, the sample gas flow rate Qs and the power gas volume flow rate Q0 are set. I.e., S2-S ═ 0.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the power source is controlled, the air extraction amount is changed, the actual sample airflow speed S fed back is obtained, and the sample airflow speed S is finally equal to S2, so that the constant-speed sampling with temperature compensation is finally realized, and the particle detector is ensured to accurately measure the content of particles in the smoke through the measuring chamber.
Drawings
FIG. 1 is a schematic view of the apparatus configuration 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, the present invention provides two embodiments:
the first embodiment is as follows:
the utility model provides a take temperature compensation's constant speed sampling device, including flue gas sampler, the sample analysis structure, drive structure and control system, flue gas sampler is by the flue gas sampling tube, flue gas velocity of flow appearance and flue gas temperature appearance constitute, sample analysis structure is by sample gas velocity of flow appearance, sample gas temperature appearance and particulate matter detector constitute, particulate matter detector is provided with the measuring chamber, the drive structure comprises aspiration pump or jet pump and extraction controller, the flue gas exists with the flue, the gas in chimney or other pipelines, the sample connection is the thief hatch of flue gas sampler, the flue gas that awaits measuring of sample smell entering thief hatch, the extraction controller is the equipment of control extraction sample gas, the extraction power supply is used for the equipment of the production extraction power of extraction sample gas, can be the aspiration pump, the jet pump etc., the velocity of flow measuring point: measuring point for measuring flow rate of extracted gas, measuring chamber: the chamber is used for installing a meter to measure the particles of the sample gas;
the control system is respectively connected with the flue gas sampling structure, the sample analysis structure and the driving structure building circuit, the flue gas sampling structure is communicated with the sample analysis structure, and the driving structure is communicated with the sample analysis structure.
The flue gas sampling tube is arranged in the flue, the flue gas velocity meter and the flue gas temperature meter both penetrate through the flue, and the flue gas velocity meter and the flue gas temperature meter are both arranged in the flue gas sampling tube;
the flue gas circulates along the flue is inside, gets into inside through the flue gas sampling tube to the flue gas passes through flue gas velocity of flow appearance and flue gas temperature appearance, and flue gas velocity of flow appearance and flue gas temperature appearance are measured the velocity of flow and the temperature of flue gas respectively, and upload measurement data to control system.
The driving structure generates negative pressure through the air suction pump, so that negative pressure is formed in the measuring chamber, and the smoke in the smoke sampling tube is sucked into the measuring chamber;
the sample gas flow velocity instrument is inserted between the smoke sampling pipe and the measuring chamber, can measure the flow velocity of smoke flowing in the sample sampling pipe, and can measure the temperature of the sample gas in the measuring chamber by the sample gas temperature instrument;
the particulate matter detector can carry out particulate matter detection to the inside flue gas of measuring chamber, and sample gas flow rate appearance and sample gas temperature appearance are with measured data upload to control system.
The control system analyzes and calculates the data to obtain a final result, and the numerical value is displayed in real time through a display screen;
the control system is connected with the extraction controller, and the extraction controller can be controlled to operate through the control system, so that the operating power of the air extracting pump is indirectly controlled.
Example two:
when an air pump is adopted in the detection process, the pressure of the sample gas is P1, the pressure of the heated sample gas is P2, the volume of the sample gas is V1, the thermodynamic temperature of the flue is T1, the volume of the heated sample gas is V2 and the thermodynamic temperature of the measuring chamber is T1;
the formula for calculating the volume of the sample gas is P1V 1/T1-P2V 2/T2, and P2V 2-P1V 1T 2/T1 can be deduced; the temperature t1 is measured by matching with the flue gas and the temperature t2 of the sample gas in the measuring chamber to obtain
Since P1 is P2 during isokinetic sampling, this results in
Wherein t1 is the measured temperature of the flue, t2 is the measured temperature of the measuring chamber, S1 is the measured flow rate of the flue, S2 is the theoretical value of the flow rate required by the constant-speed sampling of the sample at the flow rate measuring point, m1 is the cross-sectional area of the flue gas sampling tube, and m2 is the cross-sectional area of the flow rate measuring point;
the control system needs to track the change of S1 according to S2 after the compensation calculation so that the difference between the final extracted actual flow rate S and S2 is zero, i.e., S2-S is 0.
When the jet pump is used in the detection process, the performance fitting quasi-two-dimensional theoretical calculation formula of the jet pump is combined with an ideal gas state equation with certain mass as follows: PV/T-constant, where P is the equivalent value, thus calculated as P1V 1/T1-P2V 2/T2 for the volume of sample gas collected;
since P1 is P2 at the time of constant-speed sampling, V2 is V1T 2/T1,
it can therefore be deduced
According to a jet pump power equation PC/P0-0.1147 (3.0365-Qs/Q0), the difference between the final extracted actual flow speed S and S2 is 0 by controlling the volume flow rate of the power gas according to a formula S1-S2-Qs/SJ, wherein the extraction pressure PC, the power gas pressure P0, the sample gas flow rate Qs and the power gas volume flow rate Q0 are set. I.e., S2-S ═ 0.
The working principle is as follows: according to the invention, the power source is controlled, the air extraction amount is changed, the actual sample airflow speed S fed back is obtained, and the sample airflow speed S is finally equal to S2, so that the constant-speed sampling with temperature compensation is finally realized, and the particle detector is ensured to accurately measure the content of particles in the smoke through the measuring chamber.
The constant-speed sampling is realized, the accurate value of the concentration of the particulate matters in the flue can be obtained, and the problem that the measurement is not accurate enough due to the fact that the sample gas is heated and expanded before the measurement to generate difference is solved.
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 (6)
1. The utility model provides a take temperature compensation's flue gas constant speed sampling device, includes flue gas sampler, sample analysis structure, drive structure and control system, its characterized in that: the smoke sampler comprises a smoke sampling tube, a smoke velocity meter and a smoke temperature meter, the sample analysis structure comprises a sample gas velocity meter, a sample gas temperature meter and a particulate matter detector, the particulate matter detector is provided with a measuring chamber, and the driving structure comprises an air pump or a jet pump and an extraction controller;
the control system is respectively connected with the smoke sampling structure, the sample analysis structure and the driving structure building circuit, the smoke sampling structure is communicated with the sample analysis structure, and the driving structure is communicated with the sample analysis structure.
2. The constant velocity sampling device with temperature compensation of claim 1, wherein: the flue gas sampling tube is arranged in the flue, the flue gas velocity meter and the flue gas temperature meter both penetrate through the flue, and the flue gas velocity meter and the flue gas temperature meter are both arranged in the flue;
the flue gas circulates along the inside of the flue, enters the inside through the flue gas sampling tube, and the flue gas passes through a flue gas velocity meter and a flue gas temperature meter, the flue gas velocity meter and the flue gas temperature meter measure the velocity of flow and the temperature of the flue gas respectively, and upload the measured data to the control system.
3. The constant velocity sampling device with temperature compensation of claim 1, wherein: the driving structure generates negative pressure through the extraction power source, so that negative pressure is formed in the measuring chamber, and the smoke in the smoke sampling tube is sucked into the measuring chamber;
the sample gas flow rate instrument is inserted between the smoke sampling pipe and the measuring chamber, can measure the flow rate of smoke flowing in the sample sampling pipe, and can measure the temperature of the sample gas in the measuring chamber by the sample gas temperature instrument;
the particle size detector can detect the particle size of smoke in the measuring chamber, and the sample gas flow velocity instrument and the sample gas temperature instrument upload measured data to the control system.
4. The constant velocity sampling device with temperature compensation of claim 1, wherein: the control system analyzes and calculates the data to obtain a final result, and the numerical value is displayed in real time through a display screen;
the control system is connected with the extraction controller, and the extraction controller can be controlled to operate through the control system, so that the operating power of the air extraction pump is indirectly controlled.
5. The constant velocity sampling device with temperature compensation of claim 1, wherein: when an air pump is adopted in the detection process, the measured pressure P1 of the sample device, the pressure P2 of the heated sample device, the volume V1 of the sample gas, the thermodynamic temperature T1 of a flue, the volume V2 of the heated sample and the thermodynamic temperature T1 of the measurement chamber are measured;
the formula P1 × V1/T1 ═ P2 × V2/T2 for the sample gas collection, and P2 × V2 ═ P1 × V1 × T2/T1 can be derived; the temperature t1 is measured by matching with the flue gas and the temperature t2 of the sample gas in the measuring chamber to obtain
Since P1 is P2 during isokinetic sampling, this results in
Wherein t1 is the measured temperature of the flue, t2 is the measured temperature of the measuring chamber, S1 is the measured flow velocity of the flue gas in the flue, S2 is the theoretical value of the flow velocity required by the constant-velocity sampling of the sample gas at the flow velocity measuring point, m1 is the cross-sectional area of the flue gas sampling tube, and m2 is the cross-sectional area of the flow velocity measuring point;
the control system needs to track the change of S1 according to S2 after compensation calculation so that the difference between the final extracted actual flow rate S and S2 is zero, i.e., S2-S is 0.
6. The constant velocity sampling device with temperature compensation of claim 1, wherein: when the jet pump is used in the detection process, the performance fitting quasi-two-dimensional theoretical calculation formula of the jet pump is combined with a certain mass ideal gas state equation as follows: p V/T is constant, where P is the same value, thus calculated for the volume of sample gas collected as P1V 1/T1P 2V 2/T2;
since P1 is P2 at the time of constant-speed sampling, V2 is V1T 2/T1,
it can therefore be deduced
According to a jet pump power equation PC/P0-0.1147 (3.0365-Qs/Q0), the difference between the final extracted actual flow speed S and S2 is 0 by controlling the volume flow rate of the power gas according to a formula S1-S2-Qs/SJ, wherein the extraction pressure PC, the power gas pressure P0, the sample gas flow rate Qs and the power gas volume flow rate Q0 are set. I.e., S2-S ═ 0.
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| CN114062059A (en) * | 2021-11-22 | 2022-02-18 | 南京波瑞自动化科技有限公司 | Flue gas collecting and measuring system with non-uniform velocity field compensation |
| CN114720212A (en) * | 2022-06-08 | 2022-07-08 | 南京波瑞自动化科技有限公司 | A adjustable speed sampling device for particulate matter concentration detection in flue |
| 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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