CN109406229B - High-humidity smoke dilution sampling device and sampling method thereof - Google Patents
High-humidity smoke dilution sampling device and sampling method thereof Download PDFInfo
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- CN109406229B CN109406229B CN201811357457.2A CN201811357457A CN109406229B CN 109406229 B CN109406229 B CN 109406229B CN 201811357457 A CN201811357457 A CN 201811357457A CN 109406229 B CN109406229 B CN 109406229B
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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
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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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
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2211—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with cyclones
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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
- 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
- G01N2001/2261—Sampling from a flowing stream of gas in a stack or chimney preventing condensation (heating lines)
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- G—PHYSICS
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- 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
- G01N2001/227—Sampling from a flowing stream of gas separating gas from solid, e.g. filter
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Abstract
The invention relates to a high-humidity smoke dilution sampling device and a sampling method thereof. PM (particulate matter) 10 Cyclone cutter, primary PM 2.5 Cyclone cutter, flue gas heat preservation and dehumidification device, sampling airflow flowmeter, primary diluter, secondary diluter and secondary PM 2.5 The cyclone cutter, the particulate filter, the flue gas mixing device, the flue gas flowmeter, the flue gas airflow control valve and the sampling pump are sequentially connected, compressed air given by the air compressor is divided into three paths through the compressed air buffering and processing device, one path is connected with the flue gas mixing device through the dry airflow control valve, the dry airflow flowmeter and the flue gas heat preservation and dehumidification device, the other path is connected with the primary diluter through the primary dilution airflow control valve and the primary dilution airflow flowmeter, and the other path is connected with the secondary diluter through the secondary dilution airflow control valve, the secondary dilution airflow flowmeter, the primary diluter and the secondary dilution airflow pressure gauge. The invention realizes sampling of the particulate matters which can be trapped and the condensable particulate matters in the flue gas under the high-humidity condition.
Description
Technical Field
The invention relates to a high-humidity flue gas particulate matter sampling system, in particular to a high-humidity flue gas dilution sampling device and a sampling method thereof.
Background
The sampling detection of the flue gas particulate matters not only can be used for researching the generation and control characteristics of the flue gas pollutants, but also has important roles in researching the aspects of particulate matter characteristic analysis, atmospheric pollution influence and source analysis, and particularly has great application prospects in the fields of particulate matter removal performance and source analysis.
The particles are divided into collectable particles and condensable particles, and the condensable particles are particles formed by the steps that the particles are in a gaseous state in a flue gas environment and enter the atmosphere to be diluted and cooled. At present, sampling analysis is mainly carried out on the trapped particulate matters of the flue gas in China. The existing foreign sampling method for the condensable particulate matters mainly enables the condensable particulate matters to form particulate matters which are easy to trap through dilution and cooling effects.
Sample detection of the trappable particles is based primarily on the aerodynamic, electrical and filtering properties of the particles. The filtration characteristics are the main relying mechanism of the conventional particulate sampling method, and typically filter cartridge sampling and filter membrane sampling are adopted. The electrical characteristics are widely applied to non-direct contact sampling of the particles, and the sampling concentration of the particles is corresponding to the induced current generated in the movement process of the charged particles, so that the electrical characteristics are often applied simultaneously with the aerodynamic characteristics of the particles. The aerodynamic characteristics are the characteristics of the particles in the movement process of the airflow, and can also directly reflect the pollution and migration characteristics of the particles in the atmosphere environment, thus being widely applied to fine Particles (PM) 2.5 ) Is used for sampling detection of the sample.
At present, the particulate matter sampling method widely adopted in China is mainly based on aerodynamic characteristics and filtering characteristics of particulate matters. However, the above sampling method is suitable for sampling particulate matters in conventional flue gas, such as the chinese patent with application number 201410810925.2, and for sampling particulate matters in wet desulfurization or saturated humidity flue gas at the tail of a wet electric precipitator in a high-humidity environment, especially in ultra-low emission modification engineering, the aerodynamic characteristics and filtering characteristics of the particulate matters are seriously affected by the saturated humidity condition. For ultra-low emission modification projects, due to extremely low concentration of particulate matters in the tail flue gas of the wet desulfurization or wet electric dust collector, errors in particulate matter sampling can seriously affect the final test result.
Therefore, it is necessary to develop a novel combined sampling system for the trapped particulate matters and the condensable particulate matters based on dilution and cooling effects aiming at the high-humidity flue gas condition.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-humidity flue gas dilution sampling device and a sampling method thereof, which aim at the high-humidity flue gas environment, and realize the combined sampling of trapped particles and condensable particles through aerodynamic particle size cutting, heat preservation and dehumidification, multi-stage dilution and high-efficiency filtration. The invention can effectively realize particle pre-separation, high-efficiency dehumidification and high-power dilution, avoid pipeline blockage and water vapor condensation, and is suitable for sampling flue gas under the conditions of high humidity and even saturated humidity.
The invention solves the problems by adopting the following technical scheme: the utility model provides a high wet flue gas dilution sampling device which characterized in that includes PM 10 Cyclone cutter, primary PM 2.5 Cyclone cutter, flue gas heat preservation and dehumidification device, air compressor, compressed air control valve, compressed air buffer and treatment device, dry air flow control valve, secondary dilution air flow control valve, primary dilution air flow meter, secondary dilution air flow meter, dry air flow meter, sampling air flow meter, primary diluter, secondary dilution air flow pressure meter, secondary diluter, and secondary PM 2.5 The device comprises a cyclone cutter, a particulate filter, a flue gas mixing device, a flue gas flowmeter, a flue gas flow control valve and a sampling pump; the PM 10 Cyclone cutter, primary PM 2.5 Cyclone cutter, flue gas heat preservation and dehumidification device, sampling airflow flowmeter, primary diluter, secondary diluter and secondary PM 2.5 Cyclone windThe device comprises a cutter, a particulate filter, a flue gas mixing device, a flue gas flowmeter, a flue gas airflow control valve and a sampling pump, wherein the secondary dilution airflow pressure gauge is arranged on the primary diluter, the air compressor, the compressed air control valve and the compressed air buffering and processing device are sequentially connected, an air outlet of the compressed air buffering and processing device is divided into three paths, the first path is sequentially connected with a compressed air inlet of the flue gas mixing device through the dry airflow control valve, the dry airflow flowmeter and the flue gas heat preservation and dehumidification device, the second path is sequentially connected with a compressed air inlet of the primary diluter through the primary dilution airflow control valve and the primary dilution airflow flowmeter, and the third path is sequentially connected with a compressed air inlet of the secondary diluter through the secondary dilution airflow control valve, the secondary dilution airflow flowmeter, the primary diluter and the secondary dilution airflow pressure gauge; the PM 10 Cyclone cutter, primary PM 2.5 Cyclone cutter and secondary PM 2.5 The bottom of the cyclone cutter is provided with an ash bucket.
Furthermore, the flue gas heat preservation and dehumidification device is of a concentric double-layer cylinder structure, the inner layer cylinder wall is made of perfluorosulfonic acid resin, the outer layer cylinder wall is made of stainless steel, and a heating and heat preservation structure is adopted outside the outer layer cylinder wall.
Further, the primary diluter is of a concentric four-layer cylinder structure, the first layer cylinder wall from inside to outside is of a stainless steel totally-enclosed micropore structure, the second layer cylinder wall is of a stainless steel totally-enclosed structure, the third layer cylinder wall is of a stainless steel semi-enclosed structure, and the fourth layer cylinder wall is of a stainless steel totally-enclosed structure.
Furthermore, the end part of the sampling air flow inlet pipeline of the secondary diluter is of a cone structure, the cone structure is positioned at the center of the inlet of the internal cavity of the secondary diluter, the cone structure is vertically intersected with the secondary dilution air flow inlet pipeline of the secondary diluter, and the air flow inlet channel forms a 'gradually-shrinking expansion nozzle'.
Further, a condensable particulate matter filtering membrane is arranged in the particulate matter filter.
The sampling method of the high-humidity flue gas dilution sampling device is as follows: will bePM 10 Cyclone cutter and primary PM 2.5 The cyclone cutter is placed in the sampling flue, or a heating and heat-preserving measure is adopted, so that the sampling environment is kept consistent with the flue environment; sampling smoke into PM 10 After cyclone, the trappable particles with aerodynamic particle size greater than 10 microns are separated into PM 10 Ash bucket of cyclone cutter, and other particles enter primary PM along with sampling smoke 2.5 Cyclone cutter, the trappable particles with aerodynamic particle size greater than 2.5 microns are separated into primary PM 2.5 The ash bucket of the cyclone cutter, and the rest particles enter a smoke heat preservation and dehumidification device along with the sampled smoke; compressed air given by the air compressor sequentially passes through a compressed air control valve and a compressed air buffer and treatment device and is then divided into three paths, namely a dry air flow, a primary dilution air flow and a secondary dilution air flow; the method comprises the steps that dry air flow enters an outer cylinder of a flue gas heat-insulating and dehumidifying device through a compressed air inlet of the flue gas heat-insulating and dehumidifying device, compressed air in the flue gas heat-insulating and dehumidifying device and sampling flue gas are kept in a counter flow mode, the air flow of the compressed air is controlled to be 2 times of the sampling flue gas flow, meanwhile, the pressure difference between the sampling flue gas and the compressed air is controlled to be +900 to-200 mbar, the outer cylinder wall of the flue gas heat-insulating and dehumidifying device is heated to enable the temperature of the compressed air to be consistent with the temperature of the sampling flue gas, and moisture in the sampling flue gas enters the compressed air through an inner cylinder wall of the flue gas heat-insulating and dehumidifying device to enable the relative humidity of the sampling flue gas to be reduced to be below 60%; the method comprises the steps that sampling smoke enters a primary diluter, primary dilution airflow enters a second-layer cylinder of the primary diluter through a compressed air inlet of the primary diluter, the primary dilution airflow and the sampling smoke are kept in a counter flow mode, the flow of the primary dilution airflow is controlled to be 1.5 times of the flow of the sampling smoke, and the primary dilution airflow enters the first-layer cylinder through micropores and is mixed with the sampling smoke; the second-stage dilution air flow enters a fourth-layer cylinder of the first-stage diluter through a compressed air inlet of the first-stage diluter, flows out of the first-stage diluter after passing through a third-layer cylinder, and keeps the second-stage dilution air flow in the third-layer cylinder and the first-stage dilution air flow in the second-layer cylinder in a counter-flow mode; the secondary dilution air flow enters the compressed air inlet pipeline of the secondary diluter and passes through the cone end of the compressed air inlet pipelineThe part enters the internal cavity of the secondary diluter, the pressure of the end part of the cone of the air inlet is lower than the pressure of the air inlet of the sampling smoke of the secondary diluter by Venturi effect, the sampling smoke is promoted to enter the secondary diluter by pressure difference effect, and the sampling smoke and the secondary dilution air flow are fully mixed in the internal cavity of the secondary diluter; the dilution ratio of the secondary diluter is controlled by the sampling smoke gas inlet air pressure and the secondary dilution air flow inlet air pressure of the secondary diluter; the total dilution ratio of the sampled smoke after primary dilution and secondary dilution is controlled to be more than 20 times, the total residence time of the sampled smoke is more than 10s, and the temperature of the diluted sampled smoke is lower than 42 ℃; the diluted sampling smoke enters into a second-level PM 2.5 The air inlet of the cyclone cutter separates particles with the aerodynamic particle size of more than 2.5 microns into secondary PM 2.5 The ash bucket of the cyclone cutter, the rest particles enter a particle filter along with the sampling smoke, and the particles with the aerodynamic particle size less than or equal to 2.5 microns are filtered and trapped; and the sampled smoke filtered by the particulate filter and clean dry airflow at the outlet of the smoke heat preservation and dehumidification device enter the smoke mixing device together and are discharged through the sampling pump.
Compared with the prior art, the invention has the following advantages and effects:
(1) At PM 10 Cyclone cutter and primary PM 2.5 On the basis of realizing the pre-separation of the particles by connecting the cyclone cutters in series, the combined sampling of the particles capable of being trapped and the condensable particles can be realized under the conditions of high humidity and even saturated humidity by combining the high-efficiency heat-preservation dehumidifying device, the multi-stage diluting device and the high-efficiency particle separating and filtering device.
（2）PM 10 Cyclone cutter and primary PM 2.5 The cyclone cutters are connected in series to realize the pre-separation of the capturable particles with the aerodynamic particle size larger than 2.5 microns, on one hand, the sampling load of the subsequent particle sampling device is reduced, and on the other hand, the coagulating and nucleating process of the capturable particles is promoted in the subsequent diluting and cooling process through the capturable particles with the aerodynamic particle size smaller than or equal to 2.5 microns.
(3) The material of flue gas heat preservation dehydrating unit inlayer cylinder wall adopts perfluorosulfonic acid resin, and outer cylinder wall adopts stainless steel heating insulation construction, realizes high-efficient dehumidification on the one hand, and on the other hand avoids the cooling effect of dehumidification in-process sampling flue gas through heating insulation to avoid condensation effect and steam to influence each other.
(4) The primary diluter adopts a concentric four-layer cylinder structure, the first layer cylinder wall adopts a stainless steel totally-enclosed micropore structure, the second layer cylinder wall adopts a stainless steel totally-enclosed structure, the third layer cylinder wall adopts a stainless steel semi-enclosed structure, and the fourth layer cylinder wall adopts a stainless steel totally-enclosed structure. The multi-layer cylinder structure is utilized, so that on one hand, the cooling dilution effect in the primary diluter is realized by heating the primary dilution air flow, and on the other hand, the further cooling of the sampled smoke in the primary diluter is realized by heating the secondary dilution air flow.
(5) The air inlet air flow channel of the secondary diluter forms a 'gradually-shrinking and expanding nozzle', on one hand, the dilution ratio of the secondary diluter is controlled by adjusting the pressure of the secondary dilution air flow, so that the total dilution ratio of the system is controlled, and on the other hand, the 'venturi effect' is utilized to promote the sampling smoke to enter the secondary diluter, and further promote the dilution and condensation effects of the sampling smoke.
(6) Two-level PM 2.5 The cyclone cutter is connected with the particulate filter in series to realize separation and collection of the particulate with the aerodynamic particle size of more than 2.5 microns and filtration and collection of the particulate with the aerodynamic particle size of less than or equal to 2.5 microns, so that the concentration of the particulate filtered and collected by the particulate filter is reduced, and the sampling time of the device is prolonged to the greatest extent under the condition that the size of the condensable particulate filtering membrane is certain.
(7) The high-humidity flue gas dilution sampling device has wide particulate matter sampling environment application, full dehumidification, cooling and dilution, and longer system stable operation time, and avoids pipeline blockage and water vapor condensation.
Drawings
Fig. 1 is a schematic structural diagram of a high-humidity flue gas dilution sampling device according to an embodiment of the invention.
In the figure: PM (particulate matter) 10 Cyclone cutter 1, primary PM 2.5 Cyclone cutter 2 and smoke protectionA temperature dehumidifying device 3, an air compressor 4, a compressed air control valve 5, a compressed air buffer and treatment device 6, a dry air flow control valve 7, a secondary dilution air flow control valve 8, a primary dilution air flow control valve 9, a primary dilution air flow meter 10, a secondary dilution air flow meter 11, a dry air flow meter 12, a sampling air flow meter 13, a primary diluter 14, a secondary dilution air flow pressure meter 15, a secondary diluter 16, and a secondary PM 2.5 Cyclone 17, particulate filter 18, flue gas mixing device 19, flue gas flowmeter 20, flue gas flow control valve 21, sampling pump 22.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Examples
Referring to FIG. 1, a high humidity flue gas dilution sampling device includes PM 10 Cyclone cutter 1, primary PM 2.5 Cyclone 2, flue gas heat-insulating and dehumidifying device 3, air compressor 4, compressed air control valve 5, compressed air buffer and processing device 6, dry air control valve 7, secondary dilution air flow control valve 8, primary dilution air flow control valve 9, primary dilution air flow meter 10, secondary dilution air flow meter 11, dry air flow meter 12, sampling air flow meter 13, primary diluter 14, secondary dilution air flow pressure meter 15, secondary diluter 16, secondary PM 2.5 Cyclone 17, particulate filter 18, flue gas mixing device 19, flue gas flowmeter 20, flue gas flow control valve 21 and sampling pump 22.
PM 10 Cyclone cutter 1, primary PM 2.5 Cyclone cutter 2, flue gas heat preservation and dehumidification device 3, sampling airflow flowmeter 13, primary diluter 14, secondary diluter 16 and secondary PM 2.5 Cyclone 17, particulate filter 18, flue gas mixing device 19, flue gas flowmeter 20, flue gas air flow control valve 21 and sampling pump 22 link to each other in order, and second grade dilution air flow pressure gauge 15 sets up on first grade diluter 14, and air compressor 4, compressed air control valve 5 and compressed air buffering and processing apparatus 6 link to each other in order, compressed airThe air outlet of the buffer and treatment device 6 is divided into three paths, the first path is connected with a compressed air inlet of the flue gas mixing device 19 sequentially through the dry air flow control valve 7, the dry air flow meter 12 and the flue gas heat preservation and dehumidification device 3, the second path is connected with a compressed air inlet of the primary diluter 14 sequentially through the primary dilution air flow control valve 9 and the primary dilution air flow meter 10, and the third path is connected with a compressed air inlet of the secondary diluter 16 sequentially through the secondary dilution air flow control valve 8, the secondary dilution air flow meter 11, the primary diluter 14 and the secondary dilution air flow pressure meter 15; PM (particulate matter) 10 The cyclone cutter 1 adopts a conical cyclone separator device with a feeding hole tangentially arranged and an ash bucket and an air outlet at the bottom, and one-stage PM 2.5 Cyclone cutter 2 and two-stage PM 2.5 The cyclone 17 employs a conical cyclone device with a feed tangentially arranged and an ash bucket at the bottom.
The flue gas heat preservation and dehumidification device 3 is of a concentric double-layer cylinder structure, the inner layer cylinder wall is made of perfluorosulfonic acid resin, the outer layer cylinder wall is made of stainless steel, and a heating and heat preservation structure is adopted outside the outer layer cylinder wall.
The primary diluter 14 is of a concentric four-layer cylinder structure, the first layer cylinder wall from inside to outside is of a stainless steel totally-enclosed micropore structure, the second layer cylinder wall is of a stainless steel totally-enclosed structure, the third layer cylinder wall is of a stainless steel semi-enclosed structure, and the fourth layer cylinder wall is of a stainless steel totally-enclosed structure.
The sampling air flow inlet pipe end of the secondary diluter 16 is of a cone structure, the cone structure is positioned at the center of the inlet of the internal cavity of the secondary diluter 16, the cone structure vertically crosses the secondary dilution air flow inlet pipe of the secondary diluter 16, and the air flow inlet channel forms a 'convergent-divergent nozzle' form.
A condensable particulate filter membrane is provided in the particulate filter 18.
The sampling method of the high-humidity flue gas dilution sampling device is as follows: PM (particulate matter) 10 Cyclone cutter 1 and primary PM 2.5 The cyclone cutter 2 is placed in the sampling flue, or a heating and heat-preserving measure is adopted, so that the sampling environment is kept consistent with the flue environment; sampling smoke into PM 10 Cyclone cutterAfter the cutter 1, the trappable particles with aerodynamic particle size greater than 10 microns are separated into PM 10 The ash bucket of the cyclone cutter 1, and the rest particles enter the first-stage PM along with the sampling smoke 2.5 Cyclone 2, the trappable particles with aerodynamic particle size greater than 2.5 microns are separated into primary PM 2.5 The ash bucket of the cyclone cutter 2 and the rest of particles enter the smoke heat preservation and dehumidification device 3 along with the sampling smoke.
The compressed air given by the air compressor 4 sequentially passes through the compressed air control valve 5 and the compressed air buffer and treatment device 6 and then is divided into three paths, namely dry air flow, primary dilution air flow and secondary dilution air flow; the dry air flow enters an outer cylinder of the flue gas heat-preserving and dehumidifying device 3 through a compressed air inlet of the flue gas heat-preserving and dehumidifying device 3, the compressed air and sampling flue gas in the flue gas heat-preserving and dehumidifying device 3 are kept in a counter flow mode, the air flow of the compressed air is controlled to be 2 times of the sampling flue gas flow, meanwhile, the pressure difference between the sampling flue gas and the compressed air is controlled to be +900 to-200 mbar, the outer cylinder wall of the flue gas heat-preserving and dehumidifying device 3 is heated to enable the temperature of the compressed air to be consistent with the temperature of the sampling flue gas, and moisture in the sampling flue gas enters the compressed air through an inner cylinder wall of the flue gas heat-preserving and dehumidifying device 3 to enable the relative humidity of the sampling flue gas to be reduced to be below 60%; the sampled smoke enters the primary diluter 14, primary dilution air flow enters a second layer cylinder of the primary diluter 14 through a compressed air inlet of the primary diluter 14, the primary dilution air flow and the sampled smoke are kept in a counter flow mode, the flow of the primary dilution air flow is controlled to be 1.5 times of the flow of the sampled smoke, and the primary dilution air flow enters the first layer cylinder through micropores to be mixed with the sampled smoke; the secondary dilution air flow enters a fourth-layer cylinder of the primary diluter 14 through a compressed air inlet of the primary diluter 14, flows out of the primary diluter 14 after passing through a third-layer cylinder, and keeps the secondary dilution air flow in the third-layer cylinder and the primary dilution air flow in the second-layer cylinder in a counter-flow mode; the secondary dilution air flow enters a compressed air inlet pipeline of the secondary diluter 16 and then enters an internal cavity of the secondary diluter 16 through the cone end part of the compressed air inlet pipeline, the pressure of the cone end part of the air inlet flow is lower than the pressure of a sampling smoke inlet of the secondary diluter 16 through Venturi effect, the sampling smoke is promoted to enter the secondary diluter 16 through pressure difference effect, and the sampling smoke and the secondary dilution air flow are fully mixed in the internal cavity of the secondary diluter 16; the dilution ratio of the secondary diluter 16 is controlled by the sampling smoke gas inlet air pressure and the secondary dilution gas inlet air pressure of the secondary diluter 16; setting the gas pressure of a sampling smoke gas inlet of the secondary diluter 16 to be 1000-1040 mbar, and setting the gas pressure of a secondary dilution gas inlet to be 1.9-2.1 bar, wherein the secondary dilution ratio is about 8 times; the total dilution ratio of the sampled smoke after primary dilution and secondary dilution is more than 20 times, the total residence time of the sampled smoke is more than 10s, and the temperature of the diluted sampled smoke is lower than 42 ℃.
The diluted sampling smoke enters into a second-level PM 2.5 The air inlet of the cyclone 17 separates particles having an aerodynamic particle size greater than 2.5 microns into secondary PM 2.5 The ash bucket of the cyclone cutter 17, the rest of the particles enter a particle filter 18 along with the sampling smoke, and the particles with the aerodynamic particle size less than or equal to 2.5 microns are filtered and trapped; the sampled flue gas filtered by the particulate filter 18 enters the flue gas mixing device 19 together with the clean dry air flow at the outlet of the flue gas heat preservation and dehumidification device 3, and is discharged through the sampling pump 22.
Although the present invention is described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (4)
1. The utility model provides a high wet flue gas dilution sampling device which characterized in that includes PM 10 Cyclone cutter (1), primary PM 2.5 The cyclone cutter (2), the flue gas heat preservation and dehumidification device (3), the air compressor (4), the compressed air control valve (5), the compressed air buffer and treatment device (6), the dry air flow control valve (7), the secondary dilution air flow control valve (8), the primary dilution air flow control valve (9), the primary dilution air flow meter (10), the secondary dilution air flow meter (11), the dry air flow meter (12), the sampling air flow meter (13),Primary diluter (14), secondary dilution airflow pressure gauge (15), secondary diluter (16), and secondary PM 2.5 The device comprises a cyclone cutter (17), a particulate filter (18), a flue gas mixing device (19), a flue gas flowmeter (20), a flue gas flow control valve (21) and a sampling pump (22); the PM 10 Cyclone cutter (1), primary PM 2.5 Cyclone cutter (2), flue gas heat preservation and dehumidification device (3), sampling airflow flowmeter (13), primary diluter (14), secondary diluter (16), secondary PM 2.5 The cyclone cutter (17), the particulate filter (18), the flue gas mixing device (19), the flue gas flowmeter (20), the flue gas airflow control valve (21) and the sampling pump (22) are sequentially connected, the secondary dilution airflow pressure gauge (15) is arranged on the primary diluter (14), the air compressor (4), the compressed air control valve (5) and the compressed air buffering and processing device (6) are sequentially connected, the air outlet of the compressed air buffering and processing device (6) is divided into three paths, the first path is sequentially connected with the compressed air inlet of the flue gas mixing device (19) through the dry airflow control valve (7), the dry airflow flowmeter (12) and the flue gas heat preservation and dehumidification device (3), the second path is sequentially connected with the compressed air inlet of the primary diluter (14) through the primary dilution airflow control valve (9) and the primary dilution airflow flowmeter (10), and the third path is sequentially connected with the compressed air inlet of the secondary diluter (16) through the secondary airflow control valve (8), the secondary dilution airflow flowmeter (11), the primary diluter (14) and the secondary dilution airflow pressure gauge (15); the PM 10 Cyclone cutter (1), primary PM 2.5 Cyclone cutter (2) and secondary PM 2.5 The bottom of the cyclone cutter (17) is provided with an ash bucket;
the primary diluter (14) is of a concentric four-layer cylinder structure, a first layer of cylinder wall from inside to outside is of a stainless steel totally-enclosed micropore structure, a second layer of cylinder wall is of a stainless steel totally-enclosed structure, a third layer of cylinder wall is of a stainless steel semi-enclosed structure, and a fourth layer of cylinder wall is of a stainless steel totally-enclosed structure; the end part of the sampling airflow inlet pipeline of the secondary diluter (16) is of a cone structure, the cone structure is positioned at the center of an inlet of an inner cavity of the secondary diluter (16), and the cone structure is vertically intersected with the secondary dilution airflow inlet pipeline of the secondary diluter (16).
2. The high-humidity flue gas dilution sampling device according to claim 1, wherein the flue gas heat preservation and dehumidification device (3) is of a concentric double-layer cylinder structure, the inner layer cylinder wall is made of perfluorosulfonic acid resin, the outer layer cylinder wall is made of stainless steel, and a heating and heat preservation structure is adopted outside the outer layer cylinder wall.
3. The high humidity flue gas dilution sampling device according to claim 1, wherein a condensable particulate filter membrane is disposed within the particulate filter (18).
4. A sampling method of a high humidity flue gas dilution sampling apparatus according to any one of claims 1 to 3, wherein the sampling method is as follows: PM (particulate matter) 10 Cyclone cutter (1) and primary PM 2.5 The cyclone cutter (2) is placed in the sampling flue, or a heating and heat-preserving measure is adopted, so that the sampling environment is kept consistent with the flue environment; sampling smoke into PM 10 After cyclone (1), the trappable particles with aerodynamic particle size greater than 10 microns are separated into PM 10 The ash bucket of the cyclone cutter (1) and the rest particles enter the first-stage PM along with the sampling smoke 2.5 Cyclone cutters (2) with aerodynamic particle size greater than 2.5 microns for separating the trappable particles into primary PM 2.5 The ash bucket of the cyclone cutter (2) and the rest particles enter a smoke heat preservation and dehumidification device (3) along with the sampling smoke; compressed air given by the air compressor (4) sequentially passes through the compressed air control valve (5) and the compressed air buffering and processing device (6) and is divided into three paths, namely dry air flow, primary dilution air flow and secondary dilution air flow; the dry air flow enters the outer cylinder of the flue gas heat preservation and dehumidification device (3) through the compressed air inlet of the flue gas heat preservation and dehumidification device (3), and the compressed air and the sampling in the flue gas heat preservation and dehumidification device (3) are keptThe flue gas is in a counter flow mode, the airflow flow of compressed air is controlled to be 2 times of the sampling flue gas flow, meanwhile, the pressure difference between the sampling flue gas and the compressed air is controlled to be +900 to-200 mbar, the outer cylinder wall of the flue gas heat preservation and dehumidification device (3) is heated to enable the temperature of the compressed air to be consistent with the temperature of the sampling flue gas, and moisture in the sampling flue gas enters the compressed air through the inner cylinder wall of the flue gas heat preservation and dehumidification device (3) to enable the relative humidity of the sampling flue gas to be reduced to be below 60%; the method comprises the steps that sampling smoke enters a primary diluter (14), primary dilution air flows into a second layer cylinder of the primary diluter (14) through a compressed air inlet of the primary diluter (14), the primary dilution air flows and the sampling smoke are kept in a counter flow mode, the flow of the primary dilution air flows is controlled to be 1.5 times of the flow of the sampling smoke, and the primary dilution air flows into the first layer cylinder through micropores to be mixed with the sampling smoke; the secondary dilution air flow enters a fourth-layer cylinder of the primary diluter (14) through a compressed air inlet of the primary diluter (14), flows out of the primary diluter (14) after passing through a third-layer cylinder, and keeps the secondary dilution air flow in the third-layer cylinder and the primary dilution air flow in the second-layer cylinder in a counter flow mode; the secondary dilution air flow enters a compressed air inlet pipeline of the secondary diluter (16) and then enters an internal cavity of the secondary diluter (16) through the cone end part of the compressed air inlet pipeline, the pressure of the cone end part of the air inlet flow is lower than the pressure of a sampling smoke gas inlet of the secondary diluter (16) through Venturi effect, the sampling smoke gas enters the secondary diluter (16) through pressure difference effect, and the sampling smoke gas and the secondary dilution air flow are fully mixed in the internal cavity of the secondary diluter (16); the dilution ratio of the secondary diluter (16) is controlled by the sampling smoke gas inlet air pressure and the secondary dilution air flow inlet air pressure of the secondary diluter (16); the total dilution ratio of the sampled smoke after primary dilution and secondary dilution is controlled to be more than 20 times, the total residence time of the sampled smoke is more than 10s, and the temperature of the diluted sampled smoke is lower than 42 ℃; the diluted sampling smoke enters into a second-level PM 2.5 The air inlet of the cyclone cutter (17) is used for separating particles with aerodynamic particle size of more than 2.5 microns into the secondary PM 2.5 Ash bucket of cyclone cutter (17), and the rest of particles are along with sampling smokeEntering a particulate filter (18), and filtering and capturing particulate matters with aerodynamic particle diameters less than or equal to 2.5 microns; the sampled smoke filtered by the particulate filter (18) and clean dry air flow at the outlet of the smoke heat preservation and dehumidification device (3) enter the smoke mixing device (19) together, and then are discharged through the sampling pump (22).
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| CN113188854A (en) * | 2021-01-22 | 2021-07-30 | 国网冀北电力有限公司电力科学研究院 | Coal-fired flue gas sampling device |
| CN116242753B (en) * | 2022-12-30 | 2024-01-26 | 山东大学 | Particulate matter monitoring system based on big data and application method thereof |
| CN118500837A (en) * | 2024-07-18 | 2024-08-16 | 江苏省环境工程技术有限公司 | Multipurpose jet flow perforated pipe dilution sampling system and environment monitoring method |
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