CN111289311A - Mixed emergency cooling type high-temperature flue gas sampling device and method - Google Patents

Mixed emergency cooling type high-temperature flue gas sampling device and method Download PDF

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Publication number
CN111289311A
CN111289311A CN202010199556.3A CN202010199556A CN111289311A CN 111289311 A CN111289311 A CN 111289311A CN 202010199556 A CN202010199556 A CN 202010199556A CN 111289311 A CN111289311 A CN 111289311A
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gas
throttle valve
way
sampling
flue gas
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张磊
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Shenyang Academy Environmental Sciences
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Shenyang Academy Environmental Sciences
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Priority to CN202010199556.3A priority Critical patent/CN111289311A/en
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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
    • 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
    • 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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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Molecular Biology (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

A mixed emergency cooling type high-temperature flue gas sampling device and method relate to the technical field of environmental monitoring. The device comprises a heating sampling pipe, a first one-way throttle valve, a first three-way pipe, a thermometer, an adsorber, a second three-way pipe, a dryer, a first gas flowmeter and an air pump which are sequentially connected together, wherein an idle air outlet end of the first three-way pipe is sequentially connected with a second one-way throttle valve, a second gas flowmeter, a buffer tank and a compressed inert gas tank through a gas pipeline, and an idle air outlet end of the second three-way pipe is sequentially connected with a third one-way throttle valve and a vacuum sampling container through a gas pipeline. The device innovating the cooling method of high-temperature flue gas sampling, greatly simplifying the system, having more compact structure, and simultaneously reducing the possibility of condensation and deposition of flue gas components in the pipeline, thereby improving the accuracy of gas sampling analysis results. The device convenient to carry, easy operation can show improvement high temperature flue gas sampling work efficiency.

Description

Mixed emergency cooling type high-temperature flue gas sampling device and method
Technical Field
The invention relates to the technical field of environmental monitoring, in particular to a mixed rapid-cooling type high-temperature flue gas sampling device and method.
Background
At present, the sampling of high-temperature flue gas is a technical difficulty at home and abroad. The key point is that under the high temperature state, the chemical reaction activity of various substances in the gas is high, molecular cracking and synthesis reaction can occur, if the temperature reduction speed is slow in the sampling process, the gas components can be changed after the chemical reaction balancing process is destroyed, and meanwhile, the problem that a large amount of high-boiling-point substances are condensed and deposited on the pipeline of the sampler is also existed. These can significantly affect the accuracy of sample collection. In order to overcome the problems, the current common method is to extract a gas sample by a heat tracing pipeline, then the gas sample is cooled by a compressor or an ice water circulating cooler, and then the gas sample passes through a plurality of adsorption devices after being cooled rapidly, and finally the content of related components in the adsorbent is analyzed to obtain the content of the substance in the gas. In the method, the high-temperature flue gas and the cooling medium exchange heat indirectly, so that the heat exchange efficiency is low, a plurality of refrigeration, adsorption and other auxiliary equipment are provided, the device is complex, the inconvenience is brought to field carrying and use, the difficulty in gas sample collection and analysis is obviously increased, and the manufacturing cost of the instrument and equipment is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a mixed quick-cooling type high-temperature flue gas sampling device and method.
The technical scheme adopted by the invention is as follows: the utility model provides a mix quick-cooling formula high temperature flue gas sampling device, its technical essential is, includes heating sampling pipe, first one-way choke valve, first three-way pipe, thermometer, adsorber, second three-way pipe, desicator, first gas flowmeter and the aspiration pump that link together in proper order through gas line, the idle end of giving vent to anger of first three-way pipe connect gradually second one-way choke valve, second gas flowmeter, buffer tank and compressed inert gas jar through gas line, the idle end of giving vent to anger of second three-way pipe has connected gradually third one-way choke valve and vacuum sampling container through gas line.
In the scheme, the filter cartridge is arranged at the air inlet end of the heating sampling pipe.
In the scheme, the filter cylinder is made of glass fiber.
In the scheme, the gas pipeline connected between the heating sampling pipe and the first one-way throttle valve, the gas pipeline connected between the first one-way throttle valve and the first three-way pipe, the gas pipeline connected between the first three-way pipe and the thermometer, and the gas pipeline connected between the first three-way pipe and the second one-way throttle valve are all made of stainless steel; the rest gas pipelines are silicone tubes.
In the scheme, the heating sampling pipe and the first one-way throttle valve, the gas pipeline between the first one-way throttle valve and the first three-way pipe, the gas pipeline between the first three-way pipe and the thermometer, and the gas pipeline connected between the first three-way pipe and the second one-way throttle valve are all made of glass; the rest gas pipelines are silicone tubes.
In the scheme, the heating sampling pipe and the first one-way throttle valve, the gas pipeline between the first one-way throttle valve and the first three-way pipe, the gas pipeline between the first three-way pipe and the thermometer, and the gas pipeline connected between the first three-way pipe and the second one-way throttle valve are all made of ceramic materials; the rest gas pipelines are silicone tubes.
In the above scheme, the adsorber is filled with macroporous adsorption resin as an adsorbent.
In the above scheme, the gas filled in the compressed inert gas tank is any one of nitrogen, helium and argon.
A sampling method of a mixed emergency cooling type high-temperature flue gas sampling device is technically characterized by comprising the following steps:
(1) placing a heating sampling gun into a high-temperature flue gas flow channel, closing a first one-way throttle valve, a second one-way throttle valve and a third one-way throttle valve, opening an air pump, and sequentially opening a compressed inert gas tank valve and the second one-way throttle valve after a pipeline forms negative pressure to discharge air in the pipeline;
(2) opening the first one-way throttle valve to suck high-temperature smoke, observing the reading of the thermometer, and adjusting the opening degrees of the first one-way throttle valve and the second one-way throttle valve to ensure that the temperature of the high-temperature smoke is not higher than 55 ℃ after the high-temperature smoke is mixed with inert gas;
(3) after the operation state is stable, reading the instantaneous volume flow of the second gas flowmeterF 2And instantaneous volume flow of the first gas flowmeterF 1Then opening a third one-way throttle valve, introducing gas into the vacuum sampling container, closing the third one-way throttle valve after the vacuum sampling container is filled with the gas, taking down the vacuum sampling container, and sending the vacuum sampling container to a laboratory for analysis, wherein the volume ratio formula of the flue gas and the inert gas in the container is as follows:
（F 1-F 2）：F 2；
after the whole sampling process is finished, recording the accumulated volume flow of the first gas flowmeterF A1And cumulative volumetric flow rate of the second gas flowmeterF A2The volume of the vacuum sampling container isVThe extraction amount of the high-temperature flue gas is: (F A1+V-F A2) (ii) a And (3) sending the particulate matters in the filter cartridge and the adsorbent in the adsorber into a laboratory for component content analysis, and adding the particulate matters and the adsorbent to obtain the content of the adsorbed target component in the high-temperature flue gas through calculation.
The invention has the beneficial effects that: this mix quick-cooling formula high temperature flue gas sampling device, its device is including the heating sampling pipe, first one-way choke valve, first three-way pipe, thermometer, adsorber, second three-way pipe, desicator, first gas flowmeter and the aspiration pump that link together in proper order, the idle end of giving vent to anger of first three-way pipe connect gradually second one-way choke valve, second gas flowmeter, buffer tank and compressed inert gas jar through gas line, the idle end of giving vent to anger of second three-way pipe has connected gradually third one-way choke valve and vacuum sampling container through gas line. In addition, the device adopts a method of mixing, diluting and cooling high-temperature flue gas by inert gas, has high heat exchange efficiency and more compact structure, simultaneously reduces the concentration of high boiling point substances in the gas flow, reduces the possibility of deposition of the high boiling point substances in the pipeline, and thereby improves the accuracy of gas sampling analysis results. The device convenient to carry, easy operation can show improvement high temperature flue gas sampling work efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a hybrid quenching type high-temperature flue gas sampling device in an embodiment of the invention;
the numbers in the figure illustrate the following: 1 filter cylinder, 2 heating sampling pipes, 3 one-way throttle valves, 4 three-way pipes, 5 thermometers, 6 one-way throttle valves, 7 gas flow meters, 8 buffer tanks, 9 compressed inert gas tanks, 10 adsorbers, 11 three-way pipes, 12 one-way throttle valves, 13 vacuum sampling containers, 14 driers, 15 gas flow meters and 16 air pumps.
Detailed Description
The above objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings 1.
Example 1:
the mixed rapid cooling type high-temperature flue gas sampling device adopted by the embodiment comprises a heating sampling pipe 2, a one-way throttle valve 3, a three-way pipe 4, an adsorber 10, a three-way pipe 11, a dryer 14, a gas flowmeter 15 and an air pump 16 which are sequentially connected together through a gas pipeline, and a thermometer 5 is further arranged on a connecting pipeline between the three-way pipe 4 and the adsorber 10. The idle air outlet end of the three-way pipe 4 is sequentially connected with a one-way throttle valve 6, a gas flowmeter 7, a buffer tank 8 and a compressed inert gas tank 9 through a gas pipeline, and the idle air outlet end of the three-way pipe 11 is sequentially connected with a one-way throttle valve 12 and a vacuum sampling container 13 through a gas pipeline.
In the embodiment, a gas pipeline between the heating sampling pipe 2 and the one-way throttle valve 3, a gas pipeline between the one-way throttle valve 3 and the three-way pipe 4, a gas pipeline between the three-way pipe 4 and the thermometer 5, and a gas pipeline connected between the three-way pipe 4 and the one-way throttle valve 6 are all made of stainless steel; the rest gas pipelines are silicone tubes.
A section of thick bamboo 1 is strained in the inlet end installation of the heating sampling pipe 2 of this embodiment, and a section of thick bamboo 1 material is glass fiber for filter the high temperature flue gas that gets into heating sampling pipe 2, detach the particulate matter in the flue gas, prevent to block up the sampling device pipeline.
The gas flowmeter 7 and the gas flowmeter 15 in the embodiment are of the same type, and can measure instantaneous and accumulated volume flow, the resolution is 0.01L/min and 1L respectively, and the working temperature is-10 ℃ to +55 ℃.
The vacuum sampling container in this embodiment is a vacuum flask 13 having a volume of 3L.
In this embodiment, the adsorber 10 is filled with XAD-2 macroporous adsorbent resin, and the dryer 14 is filled with silica gel granular desiccant.
The compressed inert gas tank 9 in this embodiment is filled with nitrogen gas.
Example 2:
this example differs from example 1 in that: in the embodiment, a gas pipeline between the heating sampling pipe 2 and the one-way throttle valve 3, a gas pipeline between the one-way throttle valve 3 and the three-way pipe 4, a gas pipeline between the three-way pipe 4 and the thermometer 5, and a gas pipeline connected between the three-way pipe 4 and the one-way throttle valve 6 are all made of glass; the rest gas pipelines are silicone tubes.
The compressed inert gas tank 9 in this embodiment is filled with helium gas.
The vacuum sampling container in this embodiment employs a suma tank.
Example 3:
this example differs from example 1 in that: in the embodiment, a gas pipeline between the heating sampling pipe 2 and the one-way throttle valve 3, a gas pipeline between the one-way throttle valve 3 and the three-way pipe 4, a gas pipeline between the three-way pipe 4 and the thermometer 5, and a gas pipeline connected between the three-way pipe 4 and the one-way throttle valve 6 are all made of ceramic materials; the rest gas pipelines are silicone tubes.
The compressed inert gas tank 9 in this embodiment is filled with argon gas.
The vacuum sampling container in this embodiment is a syringe or a sampling bag.
Example 4:
the mixed rapid-cooling type high-temperature flue gas sampling method adopted by the embodiment comprises the following processes:
firstly, a heating sampling gun 2 is placed in a flue, the temperature of flue gas is 550 ℃, a one-way throttle valve 3, a one-way throttle valve 6 and a one-way throttle valve 12 are closed, an air pump 16 is opened (the flow is 5L/min), after a pipeline forms negative pressure, a valve of a compressed nitrogen tank 9 and the one-way throttle valve 6 are opened in sequence, and air in the pipeline is discharged.
Then the one-way throttle valve 3 is opened to suck the high-temperature flue gas, the reading of the thermometer 5 is observed, and the opening degree of the one-way throttle valve 3 and the one-way throttle valve 6 is adjusted to ensure that the temperature of the mixed high-temperature flue gas and nitrogen is not higher than 55 ℃.
After the operation state of the device is stable, respectively reading the instantaneous volume flow F2 of the gas flowmeter 7 and the instantaneous volume flow F1 of the gas flowmeter 15, then opening the one-way throttle valve 12, sucking the gas into the vacuum sampling container 13, closing the one-way throttle valve 12 after the vacuum sampling container 13 is full, taking down the vacuum sampling container 13 and sending the vacuum sampling container 13 to a laboratory for analysis, wherein the volume ratio of the flue gas to the inert gas in the container is (F1-F2): F2. for example, if F2 is 4.5L/min and F1 is 5L/min, the actual volume of flue gas collected in the vacuum sampling container 13 with a volume of 3L is 0.3L, i.e. the concentration of the target component of the gas sample in the vacuum sampling container 13 is 1/10 of the actual concentration in the flue gas.
The whole sampling process lasts for 30 min, at the moment, the accumulated volume flow FA2 of the gas flowmeter 7 and the accumulated volume flow FA1 of the gas flowmeter 15, and the volume of the vacuum sampling container 13 is 3L, so that (FA1+3-FA2) is the extraction amount of the high-temperature flue gas. Collecting and storing the particulate matters in the filter cartridge 2 and the XAD-2 adsorbent in the adsorber 10, sending the collected and stored particulate matters and the XAD-2 adsorbent into a laboratory for analyzing the content of target components, adding the total amount of the target components detected by the particulate matters and the XAD-2 adsorbent, and dividing the total amount of the target components by (FA1+3-FA2) to obtain the content of the target components in the high-temperature flue gas.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. The utility model provides a mix quick-cooling formula high temperature flue gas sampling device, its characterized in that includes heating sampling pipe (2), first one way choke valve (3), first three-way pipe (4), thermometer (5), adsorber (10), second three-way pipe (11), desicator (14), first gas flowmeter (15) and aspiration pump (16) that link together in proper order through gas line, the idle end of giving vent to anger of first three-way pipe (4) connect gradually second one way choke valve (6), second gas flowmeter (7), buffer tank (8) and compressed inert gas jar (9) through gas line, the idle end of giving vent to anger of second three-way pipe (11) has connected gradually third one way choke valve (12) and vacuum sampling container (13) through gas line.
2. The mixed rapid-cooling type high-temperature flue gas sampling device as claimed in claim 1, wherein a filter cartridge (1) is installed at the air inlet end of the heating sampling pipe (2).
3. The hybrid rapid-cooling high-temperature flue gas sampling device as claimed in claim 2, wherein the material of the filter cartridge (1) is glass fiber.
4. The hybrid rapid-cooling type high-temperature flue gas sampling device as claimed in claim 1, wherein the heating sampling pipe (2) and the first one-way throttle valve (3), the gas pipeline between the first one-way throttle valve (3) and the first three-way pipe (4), the gas pipeline between the first three-way pipe (4) and the thermometer (5), and the gas pipeline connected between the first three-way pipe (4) and the second one-way throttle valve (6) are all made of stainless steel; the rest gas pipelines are silicone tubes.
5. The mixed rapid-cooling type high-temperature flue gas sampling device as claimed in claim 1, wherein the heating sampling pipe (2) and the first one-way throttle valve (3), the gas pipeline between the first one-way throttle valve (3) and the first three-way pipe (4), the gas pipeline between the first three-way pipe (4) and the thermometer (5), and the gas pipeline connected between the first three-way pipe (4) and the second one-way throttle valve (6) are made of glass; the rest gas pipelines are silicone tubes.
6. The mixed rapid-cooling type high-temperature flue gas sampling device as claimed in claim 1, wherein the heating sampling pipe (2) and the first one-way throttle valve (3), the gas pipeline between the first one-way throttle valve (3) and the first three-way pipe (4), the gas pipeline between the first three-way pipe (4) and the thermometer (5), and the gas pipeline connected between the first three-way pipe (4) and the second one-way throttle valve (6) are made of ceramic materials; the rest gas pipelines are silicone tubes.
7. The hybrid rapid-cooling high-temperature flue gas sampling device as claimed in claim 1, wherein the adsorber (10) is filled with macroporous adsorbent resin as adsorbent.
8. The hybrid rapid-cooling type high-temperature flue gas sampling device as claimed in claim 1, wherein the compressed inert gas tank (9) is filled with any one of nitrogen, helium and argon.
9. The hybrid rapid-cooling high-temperature flue gas sampling device as claimed in claim 1, wherein the dryer is filled with silica gel particles.
10. The sampling method of the hybrid emergency cooling type high-temperature flue gas sampling device according to claim 1, characterized by comprising the following steps:
(1) placing a heating sampling gun into a high-temperature flue gas flow channel, closing a first one-way throttle valve, a second one-way throttle valve and a third one-way throttle valve, opening an air pump, and sequentially opening a compressed inert gas tank valve and the second one-way throttle valve after a pipeline forms negative pressure to discharge air in the pipeline;
(2) opening the first one-way throttle valve to suck high-temperature smoke, observing the reading of the thermometer, and adjusting the opening degrees of the first one-way throttle valve and the second one-way throttle valve to ensure that the temperature of the high-temperature smoke is not higher than 55 ℃ after the high-temperature smoke is mixed with inert gas;
(3) after the operation state is stable, reading the instantaneous volume flow of the second gas flowmeterF 2And instantaneous volume flow of the first gas flowmeterF 1Then opening a third one-way throttle valve, introducing gas into the vacuum sampling container, closing the third one-way throttle valve after the vacuum sampling container is filled with the gas, taking down the vacuum sampling container, and sending the vacuum sampling container to a laboratory for analysis, wherein the volume ratio formula of the flue gas and the inert gas in the container is as follows:
（F 1-F 2）：F 2；
after the whole sampling process is finished, recording the accumulated volume flow of the first gas flowmeterF A1And cumulative volumetric flow rate of the second gas flowmeterF A2The volume of the vacuum sampling container isVThe extraction amount of the high-temperature flue gas is: (F A1+V-F A2) (ii) a And (3) sending the particulate matters in the filter cartridge and the adsorbent in the adsorber into a laboratory for component content analysis, and adding the particulate matters and the adsorbent to obtain the content of the adsorbed target component in the high-temperature flue gas through calculation.
CN202010199556.3A 2020-03-20 2020-03-20 Mixed emergency cooling type high-temperature flue gas sampling device and method Pending CN111289311A (en)

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CN202010199556.3A CN111289311A (en) 2020-03-20 2020-03-20 Mixed emergency cooling type high-temperature flue gas sampling device and method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023193354A1 (en) * 2022-04-06 2023-10-12 苏州西热节能环保技术有限公司 Mercury sampling apparatus based on active carbon adsorption under high temperature, and control method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023193354A1 (en) * 2022-04-06 2023-10-12 苏州西热节能环保技术有限公司 Mercury sampling apparatus based on active carbon adsorption under high temperature, and control method

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