CN218212198U - Coal fired power plant fixed source VOCs sampling device - Google Patents
Coal fired power plant fixed source VOCs sampling device Download PDFInfo
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- CN218212198U CN218212198U CN202221748806.5U CN202221748806U CN218212198U CN 218212198 U CN218212198 U CN 218212198U CN 202221748806 U CN202221748806 U CN 202221748806U CN 218212198 U CN218212198 U CN 218212198U
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Abstract
The utility model relates to a technical field of fixed source volatile gas sampling, in particular to a coal fired power plant fixed source VOCs sampling device, the device includes a Suma jar, a sampling gun, a first-level gas diluter and a second-level gas diluter, a sampling gun smoke outlet is connected with a first air inlet of the first-level diluter through a sampling pipeline, a sampling gun smoke outlet is respectively connected with a second air inlet of the first-level diluter and an air inlet of the second-level diluter through another sampling pipeline, and a gas outlet of the first-level diluter and a gas outlet of the second-level diluter are both connected with the Suma jar; the utility model discloses discharge and sample the fixed source VOCs of coal fired power plant, can realize carrying out qualitative analysis to 100 multiple VOCs kinds with present comparatively advanced cold-trap pre-concentration air intake system, provide technical support for china research and development and formulation coal fired power plant VOCs pertinence control technique and policy.
Description
Technical Field
The utility model relates to a technical field of fixed source volatile gas sampling, in particular to coal fired power plant fixed source VOCs sampling device.
Background
In addition to a large amount of conventional pollutants, volatile Organic Compounds (VOCs) with certain concentration are also discharged in the coal combustion process of the coal-fired power plant, and are important precursors of ozone and secondary organic aerosol in the atmosphere, so that photochemical smog, haze and other composite atmospheric pollution are formed; and most VOCs are extremely toxic and cause great harm to human health. China coal-fired power plants are large in quantity and large in emission, and the influence of VOCs cannot be ignored, so that the method has important practical significance in monitoring and controlling the emission concentration of VOCs in the coal-fired power plants. At present, in China, an air bag, an adsorption pipe and a Suma tank are adopted for sampling VOCs in the atmosphere, and an air bag and an adsorption pipe are adopted for sampling VOCs of a fixed source. The inner wall of the Suma tank is subjected to inerting treatment, background pollution can be avoided, the subsequent qualitative analysis of more than 100 types of VOCs can be realized with the current advanced cold trap pre-concentration air inlet system, the Suma tank is an advanced and effective sampling tool for collecting and storing the VOCs, and at the present stage, no device and method for sampling VOCs of a fixed-source coal-fired power plant by using the Suma tank exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the utility model provides a coal fired power plant's fixed source VOCs sampling device for solve prior art, can't carry out the problem of sampling to fixed source coal fired power plant VOCs through the suma jar.
The technical scheme of the utility model:
the utility model provides a coal fired power plant fixed source VOCs sampling device, includes the sumac jar, still includes sampling rifle, the gaseous diluter of one-level and the gaseous diluter of second grade, and the sampling rifle exhanst gas outlet connects the first air inlet of one-level diluter through a sampling pipeline, and the sampling rifle exhanst gas outlet connects one-level diluter second air inlet and second grade diluter air inlet respectively through another sampling pipeline, and the sumac jar is all connected with second grade diluter gas outlet in one-level diluter gas outlet.
Preferably, the sampling gun is a stainless steel heat tracing sampling gun, the heat tracing temperature is 120 +/-5 ℃, and a brushless diaphragm pump is arranged inside the sampling gun.
Preferably, the end part of the air inlet of the sampling gun is provided with a glass wool filter head, and the aperture of the glass wool filter head is less than or equal to 10 mu m.
Preferably, the second air inlet of the primary diluter and the air inlet of the secondary diluter are both connected with a liquid nitrogen bottle.
Preferably, a sealing cap is arranged at the top of the suma tank; the suma tank is provided with a vacuum pressure gauge.
Preferably, a flow limiting valve and an exhaust pipeline are arranged on a sampling pipeline which is connected with the first-stage diluter, the second-stage diluter and the Suma tank.
Preferably, the primary gas diluter is a fixed gas diluter with multiple dilution; the secondary gas diluter is an adjustable gas diluter with multiple dilution.
Preferably, a mass flow controller is arranged in the secondary gas diluter.
Preferably, the inner wall of the suma tank is inertized.
Preferably, a valve is arranged on a sampling pipeline connecting a flue gas outlet of the sampling gun with a second air inlet of the primary diluter and an air inlet of the secondary diluter.
The sampling method of the sampling device for the VOCs of the fixed source of the coal-fired power plant comprises the following steps:
s1, cleaning a sampling pipeline before sampling VOCs;
s2, sampling VOCs;
and S3, cleaning a sampling pipeline after the VOCs are sampled.
Preferably, step S1 specifically is, connect the first air inlet of one-level diluter respectively through the sampling pipeline with sampling rifle exhanst gas outlet, one-level diluter second air inlet, second grade diluter air inlet, stretch into coal fired power plant 'S flue with the sampling rifle inside, sampling rifle exhanst gas inlet is close to flue central point and puts, as the sampling point, open the power of tracing band and brushless diaphragm pump, the brushless diaphragm pump is with in the flue gas pump income sampling rifle, make the flue gas enter into sampling device' S sampling pipeline, utilize the flue gas to wash the sampling pipeline, dilute the flue gas by the gaseous diluter of two-stage, accomplish the dashing process before this step goes on, with the perilla jar and sampling pipeline disconnect-connection, and close the valve on the liquid nitrogen bottle.
Preferably, step S2 is to clean and vacuumize the suma tank, and connect the air outlet of the first-stage diluter and the air outlet of the second-stage diluter to the suma tank through sampling pipes; during sampling, a flow limiting valve on a sampling pipeline at the front end of the suma tank is opened to start sampling, after the vacuum pressure gauge displays that the pressure in the suma tank is consistent with the atmospheric pressure of a sampling point, the flow limiting valve is closed, a sealing cap is used for sealing, and sampling time, a sampling place, the temperature and humidity, the atmospheric pressure and working condition information are recorded.
Preferably, step S3 is specifically to open a valve of the liquid nitrogen bottle, introduce high-purity nitrogen into the sampling pipe, open a power supply and a valve of the brushless diaphragm pump, pump the high-purity nitrogen into the sampling pipe, the sampling gun and the two-stage gas diluter of the apparatus by the brushless diaphragm pump, flush the sampling pipe, dilute the nitrogen by the two-stage gas diluter, and finally discharge air through the exhaust pipe to complete the cleaning process; before the step is carried out, the Suma tank is disconnected from the sampling pipeline.
Preferably, before step S1, the air tightness of the sampling device is detected, and if the sampling device is airtight, the subsequent steps can be performed.
Preferably, after the airtightness of the sampling device is detected, a nitrogen sample is collected, and then step S1 is executed, wherein the nitrogen sample collection specifically comprises: cleaning and vacuumizing the suma tank, and connecting an air outlet of the primary diluter and an air outlet of the secondary diluter to the suma tank through sampling pipelines; the method comprises the steps of starting a power supply and a valve of the brushless diaphragm pump, opening the valve and a flow limiting valve, starting a valve on a liquid nitrogen bottle to introduce high-purity nitrogen into a pipeline, diluting the nitrogen by a first-stage gas diluter and a second-stage gas diluter, then feeding the high-purity nitrogen into a Suma tank, finally closing the flow limiting valve, sealing the Suma tank by a sealing cap, completing nitrogen sample collection, and disconnecting a sampling gun from a sampling pipeline before the step is carried out.
The utility model has the advantages that: compared with the prior art:
compared with the prior art, the utility model, it is showing the advantage and is: the utility model provides a fixed source VOCs sampling device of coal fired power plant discharges and samples to fixed source VOCs of coal fired power plant, can realize carrying out qualitative analysis to 100 multiple VOCs kinds with comparatively advanced cold trap pre-concentration air intake system at present, provides technical support for china research and development and formulate coal fired power plant VOCs pertinence control technique and policy.
Drawings
Fig. 1 is a schematic structural view of the sampling device of the present invention;
FIG. 2 is a schematic diagram showing the connection of the VOCs sampling process and the flushing before sampling the VOCs by the sampling device of the present invention;
FIG. 3 is a schematic view of the system connection of the sampling device after sampling VOCs in the cleaning process of the sampling pipeline;
in the figure: 1. coal fired power plant flue, 2, sampling rifle, 201, the cotton filter head of glass, 3, one-level gas diluter, 301, the first air inlet of one-level diluter, 302, the valve, 303, the second air inlet of one-level diluter, 304, the gas outlet of one-level diluter, 4, the second grade gas diluter, 401, the gas inlet of second grade diluter, 402, the gas outlet of second grade diluter, 5, suma jar, 501, the restriction valve, 502, the sealing cap, 503, vacuum pressure gauge.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connections between the components, the functions and operating principles of the components, the manufacturing process and the operation and use method, will be further explained in detail to help those skilled in the art to more completely, accurately and deeply understand the conception and technical scheme of the present invention, by referring to the accompanying drawings:
an embodiment of the utility model provides a coal fired power plant fixed source VOCs sampling device, including coal fired power plant flue 1, sampling rifle 2, glass cotton filter 201, one-level gas diluter 3, one-level diluter first air inlet 301, valve 302, one-level diluter second air inlet 303, one-level diluter gas outlet 304, the second grade gas diluter 4 that has mass flow controller, second grade diluter air inlet 401, second grade diluter gas outlet 402, suma jar 5, restriction valve 501, sealing cap 502, vacuum pressure gauge 503;
VOCs generated by a power plant flue 1 are used as fixed source VOCs;
in this embodiment, the flue gas outlet of the sampling gun 2 is connected with the first gas inlet 301 of the primary diluter through one sampling pipeline, the flue gas outlet of the sampling gun 2 is respectively connected with the second gas inlet 303 of the primary diluter and the gas inlet 401 of the secondary diluter through another sampling pipeline, the end part of the gas inlet of the sampling gun 2 is provided with a glass wool filter head 201, and the gas outlet 304 of the primary diluter and the gas outlet 402 of the secondary diluter are both connected with the suma tank 5; the top of the Suma tank 5 is provided with a sealing cap 502; a vacuum pressure gauge 503 is arranged on the Suma tank 5; a flow limiting valve 501 and an exhaust pipeline are arranged on a sampling pipeline connected with the Suma tank, wherein the first-stage diluter air outlet 304 and the second-stage diluter air outlet 402 are connected with the sampling pipeline, and a valve 302 is arranged on a sampling pipeline connected with the first-stage diluter second air inlet 303 and the second-stage diluter air inlet 401 through a sampling gun 2 smoke outlet.
In the embodiment, the sampling gun 2 is a stainless steel heat tracing sampling gun, the heat tracing temperature is 120 +/-5 ℃, and a brushless diaphragm pump is arranged inside the sampling gun 2; the function of the brushless diaphragm pump is increased: the flow is automatically adjusted, and the flue gas in the flue is conveyed.
In this embodiment, the aperture of the glass wool filter 201 is not more than 10 μm, so as to remove particles in the flue gas.
In the embodiment, the second air inlet 303 of the primary diluter and the air inlet (401) of the secondary diluter are both connected with a liquid nitrogen bottle.
In the present embodiment, the primary gas diluter 3 is a fixed gas diluter with multiple dilution; the two-stage gas diluter 4 is a gas diluter with adjustable dilution multiple, and the dilution multiple of the two-stage diluter is the product of the first dilution multiple and the second dilution multiple, and is about 200 times. Purpose and effect of two-stage diluter dilution multiple setting: the first-stage diluter has a fixed multiple of 40-60 times or 80-120 times, and the second-stage diluter has a dilution multiple of 2-2000 times, and is used for flue gas/gas dilution.
In this embodiment, a mass flow controller is provided in the secondary gas diluter 4. The function of the mass flow controller is as follows: the mass flow of the flue gas/gas is accurately measured and controlled.
In the embodiment, the inner wall of the Suma tank (5) is inerted, the volume is 3.2L or 6L specification, and the pressure resistance value is more than 241Kpa; humidifying or heating the tank for cleaning before sampling the Suma tank to reduce the active adsorption of the tank body, and pumping the Suma tank to vacuum (< 10 Pa) after cleaning;
in this embodiment, all sampling pipes are Teflon pipes (made of Teflon); action with Teflon tubes: prevent that the impurity in the flue gas from adsorbing on the inner wall of sampling pipeline.
The utility model discloses a another embodiment provides a coal fired power plant fixed source VOCs sampling method, specifically includes following step:
s1, detecting the air tightness of the sampling device, and if the sampling device is airtight, performing subsequent steps;
s2, collecting two groups of nitrogen samples which are respectively used as a laboratory blank and a transportation blank, and specifically comprising the following steps: firstly, cleaning and vacuumizing a Suma tank 5, and then connecting an air outlet 304 of a primary diluter and an air outlet 402 of a secondary diluter with the Suma tank 5 through sampling pipelines; the power supply and the valve of the brushless diaphragm pump are started, the valve 302 and the flow limiting valve 501 are opened, the valve on the liquid nitrogen bottle is opened to introduce high-purity nitrogen into the sampling pipeline, the nitrogen is diluted by the primary gas diluter 3 and the secondary gas diluter 4, then the high-purity nitrogen enters the Suma tank 5, finally the flow limiting valve 501 is closed, the Suma tank is sealed by the sealing cap 502, the nitrogen sample collection is completed, and before the step is carried out, the sampling gun 2 is disconnected from the sampling pipeline.
Step S3, before VOCs sampling, cleaning a sampling pipeline:
connect the first air inlet 301 of one-level diluter respectively with 2 exhanst gas outlets of sampling rifle through the sampling pipeline, one-level diluter second air inlet 303, second grade diluter air inlet 401, stretch into coal fired power plant flue 1 inside with sampling rifle 2, 2 smoke inlet of sampling rifle is close to 1 central point of power plant flue and puts, as the sampling point, open the power of tracing area and brushless diaphragm pump, brushless diaphragm pump is gone into the flue gas pump in with the flue in the sampling rifle 2, make the flue gas enter into sampling device's sampling pipeline, utilize the flue gas to wash the sampling pipeline, dilute the flue gas by the gaseous diluter of two-stage, accomplish the dashing process before, this step goes on, with suo ma jar 5 and sampling pipeline disconnect-connection, and close the valve on the liquid nitrogen bottle.
Step S4, sampling VOCs:
firstly, cleaning and vacuumizing a Suma tank 5, and then connecting an air outlet 304 of a primary diluter and an air outlet 402 of a secondary diluter with the Suma tank 5 through sampling pipelines; during sampling, the flow limiting valve 501 on the sampling pipeline at the front end of the suma jar 5 is opened, sampling is started, after the vacuum pressure 503 table shows that the pressure in the suma jar 5 is consistent with the atmospheric pressure of a sampling point, the flow limiting valve 501 is closed, a sealing cap 502 is used for sealing, and the sampling time, the sampling place, the temperature and the humidity, the atmospheric pressure and the working condition information are recorded.
Step S5, after VOCs are sampled, cleaning a sampling pipeline:
opening a valve of a liquid nitrogen bottle, introducing high-purity nitrogen into a sampling pipeline, opening a power supply and a valve of a brushless diaphragm pump, pumping the high-purity nitrogen into the sampling pipeline, the sampling gun 2 and the two-stage gas diluter of the device by the brushless diaphragm pump, flushing the sampling pipeline, diluting the nitrogen by the two-stage gas diluter, and finally discharging air through an exhaust pipe to finish the cleaning process; before this step is performed, the suma tank 5 is disconnected from the sampling pipe.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, replacements, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be equivalent replacement modes, and all should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a coal fired power plant fixed source VOCs sampling device, includes suma jar (5), its characterized in that: still include sampling rifle (2), one-level gas diluter (3) and second grade gas diluter (4), sampling rifle (2) exhanst gas outlet connects the first air inlet of one-level diluter (301) through a sampling pipeline, sampling rifle (2) exhanst gas outlet connects one-level diluter second air inlet (303) and second grade diluter air inlet (401) respectively through another sampling pipeline, and suma jar (5) is all connected with second grade diluter gas outlet (402) in one-level diluter gas outlet (304).
2. The coal fired power plant fixed source VOCs sampling device of claim 1, characterized in that: the sampling gun (2) is a stainless steel heat tracing sampling gun, the heat tracing temperature is 120 +/-5 ℃, and a brushless diaphragm pump is arranged inside the sampling gun (2).
3. The coal fired power plant fixed source VOCs sampling device of claim 2, characterized in that: the end part of the air inlet of the sampling gun (2) is provided with a glass wool filter head (201), and the aperture of the glass wool filter head (201) is less than or equal to 10 mu m.
4. The coal fired power plant fixed source VOCs sampling device of claim 1, characterized in that: and a second air inlet (303) of the primary diluter and an air inlet (401) of the secondary diluter are both connected with a liquid nitrogen bottle.
5. The coal fired power plant fixed source VOCs sampling device of claim 4, characterized by: the top of the Suma tank (5) is provided with a sealing cap (502); the suma pot (5) is provided with a vacuum pressure gauge (503).
6. The coal fired power plant fixed source VOCs sampling device of claim 5, characterized by: a flow limiting valve (501) and an exhaust pipeline are arranged on a sampling pipeline connected with the first-stage diluter air outlet (304) and the second-stage diluter air outlet (402) and the Suma tank.
7. The coal fired power plant fixed source VOCs sampling device of claim 1, characterized in that: the primary gas diluter (3) is a gas diluter which is diluted and fixed by multiple; the secondary gas diluter (4) is an adjustable gas diluter with multiple dilution.
8. The coal fired power plant fixed source VOCs sampling device of claim 1, characterized in that: and a mass flow controller is arranged in the secondary gas diluter (4).
9. The coal fired power plant fixed source VOCs sampling device of claim 5, characterized in that: the inner wall of the Suma tank (5) is subjected to inerting treatment.
10. The coal fired power plant fixed source VOCs sampling device of claim 1, characterized in that: and a sampling pipeline, which is connected with a second gas inlet (303) of the primary diluter and a gas inlet (401) of the secondary diluter, of a smoke outlet of the sampling gun (2) is provided with a valve (302).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221748806.5U CN218212198U (en) | 2022-07-06 | 2022-07-06 | Coal fired power plant fixed source VOCs sampling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221748806.5U CN218212198U (en) | 2022-07-06 | 2022-07-06 | Coal fired power plant fixed source VOCs sampling device |
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| Publication Number | Publication Date |
|---|---|
| CN218212198U true CN218212198U (en) | 2023-01-03 |
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| CN202221748806.5U Active CN218212198U (en) | 2022-07-06 | 2022-07-06 | Coal fired power plant fixed source VOCs sampling device |
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| CN (1) | CN218212198U (en) |
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- 2022-07-06 CN CN202221748806.5U patent/CN218212198U/en active Active
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