CN113804515A - Chimney exhaust port SO of coal-fired power plant3Continuous sampling device and method - Google Patents
Chimney exhaust port SO of coal-fired power plant3Continuous sampling device and method Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 161
- 238000000034 method Methods 0.000 title claims description 35
- 239000000523 sample Substances 0.000 claims abstract description 73
- 239000000779 smoke Substances 0.000 claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 29
- 239000000956 alloy Substances 0.000 claims abstract description 29
- 239000010453 quartz Substances 0.000 claims abstract description 29
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003546 flue gas Substances 0.000 claims abstract description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000007664 blowing Methods 0.000 claims description 50
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000010926 purge Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 abstract description 12
- 230000000295 complement effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 239000000428 dust Substances 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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Abstract
The invention relates to a chimney smoke outlet SO of a coal-fired power plant3The continuous sampling device comprises a high-temperature sampling probe rod, a mounting flange and a sampling box body shell; the high-temperature sampling probe rod extends into the smoke outlet of the chimney, is fixed on the smoke outlet of the chimney through a mounting flange, and the outer end of the high-temperature sampling probe rod is connected with the sampling box shell; the high-temperature sampling probe rod comprises a first alloy filter, a second alloy filter, a first inner tube, a second inner tube, a first quartz filter element and a second quartz filter element; the alloy filter I is communicated with one end of the inner tube I, and the other end of the inner tube I is connected with the quartz filter core I; the second alloy filter is communicated with one end of the second inner tube, and the other end of the second inner tube is connected with the second quartz filter element. The invention has the beneficial effects that: the invention adopts a double-path inner pipe design and realizes the flue gas SO of the coal-fired power plant based on a time division complementary mode3Continuous sampling solves the problem of discontinuous sampling, and is favorable for SO of coal-fired power plants3Emission continuity monitoring.
Description
Technical Field
The invention relates to a SO3A sampling device and a method, in particular to a chimney smoke outlet SO of a coal-fired power plant3Continuous sampling apparatus and method.
Background
SO in flue gas discharged by coal-fired power plant3The air pollution is intensified, and the adverse effects such as equipment corrosion are also caused, SO the SO in the flue gas discharged by the coal-fired power plant3Real-time monitoring of the concentration is necessary. At present, for SO in coal-fired flue gas3The concentration discharge measurement comprises a chemical method and a spectrum method, wherein the chemical method and the spectrum method are difficult to realize online monitoring, and the spectrum method is matched with a spectrum analyzer to easily realize SO3And (4) online monitoring. Therefore, SO in coal-fired flue gas3Sample continuity of (2) to SO3Concentration emission monitoring is critical.
At present, the smoke outlet SO of the chimney of the coal-fired power plant3The sampling adopts the extraction type sampling. For example, Chinese patent with publication number CN110806339A discloses SO in flue gas of thermal power plant3A sampling method, comprising: testing basic flue gas parameters, selecting a sampling nozzle, calculating the flow of a sampling pump, assembling the device, heating and controlling the temperature, starting the sampling pump, adding steam, stopping sampling and sample recovery, analyzing sulfate ions and analyzing SO3Concentration ofAnd (4) calculating. For example, chinese patent publication No. CN209525150U discloses a flue gas sampler for a thermal power plant, which comprises a flue gas sampling rod, a flue gas sampling probe, a flue gas probe filter element, an electric heater, a probe external blowing device, a probe internal blowing device and a gas inlet pipe, wherein the flue gas sampling probe is arranged at one end of the sampling rod and is arranged in a protective box; the smoke probe filter element is arranged on the smoke probe and is provided with a filter element operating handle; the electric heater is arranged on the smoke probe; the probe external blower is arranged outside the smoke probe filter element; the probe internal blower is arranged inside the smoke probe filter element; the gas inlet pipe is communicated with the interior of the smoke probe filter element.
Flue gas outlet SO of chimney of coal-fired power plant adopted at present3Sampling apparatus and method, in the presence of SO due to back-flushing dust removal3The sampling process is discontinuous, thereby causing the SO of the chimney exhaust port of the coal-fired power plant3The problem that the emission real-time monitoring system lacks part of monitoring data is solved.
Disclosure of Invention
The invention aims to overcome the defect of SO in coal-fired flue gas in the prior art3SO caused by back-blowing dust removal in the sampling process3The problem of discontinuous sampling is solved, and a chimney exhaust port SO of a coal-fired power plant is provided3Continuous sampling device and method, and device and method realize SO in flue gas of coal-fired power plant3Continuous sampling is carried out, thereby ensuring SO of the coal-fired power plant3The continuous monitoring of concentration emission possesses the flexibility that high temperature sample probe rod got into chimney adjustable length simultaneously.
The flue gas outlet SO of the chimney of the coal-fired power plant3The continuous sampling device comprises a high-temperature sampling probe rod, a mounting flange and a sampling box body shell; the high-temperature sampling probe rod extends into the smoke outlet of the chimney, is fixed on the smoke outlet of the chimney through a mounting flange, and the outer end of the high-temperature sampling probe rod is connected with the sampling box shell;
the high-temperature sampling probe rod comprises a first alloy filter, a second alloy filter, a first inner tube, a second inner tube, a first quartz filter element and a second quartz filter element; the alloy filter I is communicated with one end of the inner tube I, and the other end of the inner tube I is connected with the quartz filter core I to form a sampling channel; the alloy filter II is communicated with one end of the inner tube II, and the other end of the inner tube II is connected with the quartz filter element II to form a sampling channel;
a first back-blowing electromagnetic valve, a second back-blowing electromagnetic valve, a first back-blowing pipeline, a second back-blowing pipeline, a temperature controller and a time controller are arranged in the sampling box body shell; the first blowback pipeline and the second blowback pipeline are communicated with compressed air; a first back-blowing electromagnetic valve is arranged at the joint of the first inner pipe, the first back-blowing pipeline and the sampling outlet, and a second back-blowing electromagnetic valve is arranged at the joint of the second inner pipe, the second back-blowing pipeline and the sampling outlet; the time controller is connected with the first back-blowing electromagnetic valve and the second back-blowing electromagnetic valve.
Preferably, the method comprises the following steps: two sampling channels of the high-temperature sampling probe rod are wrapped in the heating insulation layer.
Preferably, the method comprises the following steps: the heating and heat-preserving layer is connected with the temperature controller.
Preferably, the method comprises the following steps: the mounting flange comprises a flange sleeve and a fixing screw; the flange sleeve is fixed on the outer surface of a chimney smoke outlet, the flange sleeve is sleeved outside the high-temperature sampling probe rod, and the flange sleeve and the high-temperature sampling probe rod are fastened through fixing screws.
The flue gas outlet SO of the chimney of the coal-fired power plant3The working method of the continuous sampling device comprises the following steps:
s1, mounting an installation flange on the outer surface of a chimney smoke outlet of the coal-fired power plant, fixing a high-temperature sampling probe rod on the chimney smoke outlet through the installation flange, and adjusting the length of the high-temperature sampling probe rod extending into the chimney smoke outlet by moving the relative position of the high-temperature sampling probe rod and the installation flange; when the device runs, the temperature of the temperature controller is set, the heating insulation layer is heated, and the temperature is maintained within the set temperature range and kept stable;
s2, after the temperature is stable, sampling is started, the first blowback pipeline and the second blowback pipeline are connected with compressed air, the time controller controls the first blowback electromagnetic valve to be in a closed state, and the second blowback electromagnetic valve is in an open state, under the condition, the sampling channel where the first inner tube is located is in an unblocked state, and the sampling channel where the second inner tube is located is in a closed state; under the suction action, the flue gas SO of the smoke outlet of the chimney3Is sampled through a sampling channel in which the inner tube is located, and passes throughThe sampling outlet enters an analyzer; the second back-blowing electromagnetic valve is in an open state, the second back-blowing pipeline is unblocked, and compressed air purges the second quartz filter element, the second inner tube and the second alloy filter to clean fly ash;
s3, after T time, the time controller controls the first blowback solenoid valve and the second blowback solenoid valve to switch the state, under the condition, the sampling channel of the first inner tube is in a closed state, and the sampling channel of the second inner tube is in an unblocked state; under the suction action, the flue gas SO of the smoke outlet of the chimney3The sample is taken through the sampling channel where the inner tube II is positioned, and enters the analyzer through the sampling outlet; the first back-blowing electromagnetic valve is in an open state, the first back-blowing pipeline is unblocked, and compressed air purges the first quartz filter element, the first inner tube and the first alloy filter to clean fly ash;
and S4, after the T time, the time controller controls the first back-blowing electromagnetic valve and the second back-blowing electromagnetic valve to switch states, and the sampling back-blowing operation of the step S2 is repeated to cyclically perform sampling and blowing.
Preferably, the method comprises the following steps: in step S1, the temperature controller controls the temperature of the heating and insulating layer to be within the range of 80-500 ℃.
Preferably, the method comprises the following steps: in step S3 and step S4, the T time is 1-24 h.
The invention has the beneficial effects that:
1. the invention adopts a double-path inner pipe design and realizes the flue gas SO of the coal-fired power plant based on a time division complementary mode3Continuous sampling solves the problem of discontinuous sampling, and is favorable for SO of coal-fired power plants3Emission continuity monitoring.
2. The relative positions of the mounting flange and the high-temperature sampling probe rod can be adjusted, so that the length of the high-temperature sampling probe rod extending into the chimney can be adjusted, and the flexibility is improved.
Drawings
FIG. 1 shows a smoke outlet SO of a chimney of a coal-fired power plant3Schematic diagram of continuous sampling device.
Description of reference numerals: 1-high temperature sampling probe rod; 2-installing a flange; 3-a first back-blowing electromagnetic valve; 4-a second back-blowing electromagnetic valve; 5-a first blowback pipeline; 6-a second blowback pipeline; 7-sampling box body shell; 8-a sampling outlet; 9-a temperature controller; 10-a time controller; 11-chimney smoke outlet; 101-alloy filter one; 102-alloy filter two; 103-inner tube one; 104-inner tube two; 105-a quartz filter element I; 106-quartz filter element two; 107-heating the heat preservation layer; 201-flange sleeve; 202-set screw.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Flue gas SO of current coal-fired power plant3The sampling is completed by adopting an extraction type sampling gun, and in the process of back flushing, a sampling pipeline needs to be cut off, SO that SO is generated3The sampling process is discontinuous, thereby causing the SO of the chimney exhaust port of the coal-fired power plant3The emission real-time monitoring system lacks part of monitoring data. Compared with the prior art, the method realizes the SO of the flue gas of the coal-fired power plant by adopting a double-path inner pipe design based on time division complementation3Sampling continuity is ensured, thereby ensuring the smoke outlet SO of the chimney of the coal-fired power plant3The integrity of the emission real-time monitoring system data.
Example one
An embodiment of the application provides a coal fired power plant chimney exhaust port SO3A continuous sampling device, as shown in fig. 1, comprising: the high-temperature sampling probe rod 1, the mounting flange 2 and the sampling box shell 7. The high-temperature sampling probe rod 1 extends into the chimney smoke outlet 11, and the high-temperature sampling probe rod 1 is fixed on the outer wall of the chimney smoke outlet 11 through the mounting flange 2; the outer end of the high-temperature sampling probe rod 1 is connected with a sampling box shell 7.
The high-temperature sampling probe rod 1 comprises a first alloy filter 101, a second alloy filter 102, a first inner tube 103, a second inner tube 104, a first quartz filter element 105, a second quartz filter element 106 and a heating insulation layer 107. The alloy filter I101 is communicated with one end of the inner tube I103, and the other end of the inner tube I103 is connected with the quartz filter core I105 to form a sampling channel; the second alloy filter 102 is communicated with one end of the second inner tube 104, and the other end of the second inner tube 104 is connected with the second quartz filter element 106 to form a sampling channel. The sample in the chimney is sucked, is primarily filtered by the alloy filter, then enters the shell of the sampling box body from the inner tube to the quartz filter element, and finally is discharged from the sampling outlet. The two sampling channels of the high-temperature sampling probe rod 1 are wrapped in the heating insulation layer 107. The high-temperature sampling probe rod is made of stainless steel materials which can resist more than 200 ℃.
The mounting flange 2 comprises a flange sleeve 201 and a set screw 202. The flange sleeve 201 is fixed on the 11 outer walls of chimney exhaust port, and the flange sleeve 201 cover can adjust relative position in the outside of high temperature sample probe rod 1, can adjust the inside length of high temperature sample probe rod stretching into the chimney through removing high temperature sample probe rod and the telescopic relative position of flange promptly, and flange sleeve 201 passes through set screw 202 with high temperature sample probe rod 1 and fastens, fixes the relative position of flange sleeve 201 and high temperature sample probe rod 1.
A first back-blowing electromagnetic valve 3, a second back-blowing electromagnetic valve 4, a first back-blowing pipeline 5, a second back-blowing pipeline 6, a temperature controller 9 and a time controller 10 are arranged in the sampling box body shell 7. And the first blowback pipeline 5 and the second blowback pipeline 6 are communicated with compressed air and are used for removing dust of the blowback filter element. The first 103 of inner tube and the first 5 of blowback pipeline and the handing-over department of sample export 8 are equipped with blowback solenoid valve 3, and the second 104 of inner tube and the second 6 of blowback pipeline and the handing-over department of sample export 8 are equipped with blowback solenoid valve two 4, and the blowback solenoid valve is used for the sample in-process to sweep quartz filter core, inner tube and alloy filter, prevents to block up, and the purge gas adopts compressed air, realizes SO through the state of opening and close of adjusting inner tube and blowback pipeline3Sampling and back-blowing dust removal are carried out simultaneously, thereby realizing continuous SO3And (6) sampling. When the back-blowing electromagnetic valve is in an open state, the inner pipe is communicated with the back-blowing pipeline, and when the back-blowing electromagnetic valve is in a closed state, the inner pipe is communicated with the sampling outlet 8. When the inner pipe I103 is in the sampling process, the first back-blowing electromagnetic valve I3 is in a closed state, the second back-blowing electromagnetic valve II 4 is in an open state, compressed air purges the second quartz filter element 106, the second inner pipe 104 and the second alloy filter 102 through the second back-blowing pipeline 6, and the second quartz filter element, the second inner pipe 104 and the second alloy filter 102 are cleaned to flyAsh; when the inner pipe II 104 is in the sampling process, the back flushing electromagnetic valve II 4 is in a closed state, the back flushing electromagnetic valve I3 is in an open state, and compressed air purges the quartz filter element I105, the inner pipe I103 and the alloy filter I101 through the back flushing pipeline I5 to clean fly ash. The time controller 10 is connected with the first blowback solenoid valve 3 and the second blowback solenoid valve 4, and is used for controlling and switching the working states of the first blowback solenoid valve 3 and the second blowback solenoid valve 4, so as to ensure that the working states of the first inner tube 103 and the second inner tube 104 are in a time division complementary state. The temperature controller 9 is connected with the heating and insulating layer 107 and is used for controlling the temperature of the heating and insulating layer 107 to keep the temperature at SO3The gaseous temperature range is 80-500 deg.C, preferably 300 deg.C, to prevent SO during sampling3Condensation takes place resulting in gaseous SO obtained from the sampling3The content is not accurate.
Example two
The second embodiment of the application provides a chimney exhaust port SO of a coal-fired power plant3The working method of the continuous sampling device comprises the following steps:
s1, mounting an installation flange 2 on the outer wall of a chimney smoke outlet 11 of a coal-fired power plant, fixing a high-temperature sampling probe rod 1 on the chimney smoke outlet 11 through the installation flange 2, and adjusting the length of the high-temperature sampling probe rod 1 extending into the chimney smoke outlet 11 by moving the relative position of the high-temperature sampling probe rod 1 and the installation flange 2. When the device is running, the temperature of the temperature controller 9 is set, and SO is ensured in the set temperature range3In the gaseous state, preferably 300 ℃, the heating insulation layer 107 is heated, maintained at the set temperature and kept stable.
S2, after the temperature is stable, sampling is started, the first blowback pipeline 5 and the second blowback pipeline 6 are connected with compressed air, the time controller 10 controls the first blowback electromagnetic valve 3 to be in a closed state, and the second blowback electromagnetic valve 4 to be in an open state, under the condition, the sampling channel where the first inner pipe 103 is located is in an unblocked state, and the sampling channel where the second inner pipe 104 is located is in a closed state. Under the suction action, the flue gas SO of the chimney exhaust port 113Is sampled through the sampling channel in which the inner tube one 103 is located and enters the analyzer through the sampling outlet 8. Because the second blowback electromagnetic valve 4 is in an open state,and the second blowback pipeline 6 is unblocked, and the compressed air purges the second quartz filter element 106, the second inner pipe 104 and the second alloy filter 102 to clean fly ash.
S3, after T time (such as 1-24h), the time controller 10 controls the first blowback solenoid valve 3 and the second blowback solenoid valve 4 to switch the states, under the condition, the sampling channel of the first inner tube 103 is in a closed state, and the sampling channel of the second inner tube 104 is in an open state. Under the suction action, the flue gas SO of the chimney exhaust port 113The sample is taken through the sampling channel in which the second inner tube 104 is located and enters the analyzer through the sampling outlet 8. Because the first blowback electromagnetic valve 3 is in an open state, the first blowback pipeline 5 is unblocked, and the compressed air purges the first quartz filter element 105, the first inner tube 103 and the first alloy filter 101 to clean fly ash.
S4, after T time (such as 1-24h), the time controller 10 controls the first blowback solenoid valve 3 and the second blowback solenoid valve 4 to switch states, and repeats the sampling blowback operation of the step S2, so as to circularly perform time-division complementary sampling and purging.
The working states of the first back-blowing electromagnetic valve 3 and the second back-blowing electromagnetic valve 4 are controlled by the time controller 10 every T time (such as 1-24h), and continuous sampling is realized by utilizing the time division complementation of back-blowing and sampling of the two sampling pipes.
The invention adopts a double-path inner pipe design, and realizes the alternate work of two sampling pipelines by matching with the electromagnetic valve and the time controller based on a time division complementary mode, thereby ensuring that when one sampling pipeline is swept, the other sampling pipeline still carries out sampling work, and ensuring the flue gas SO of the coal-fired power plant3The sampling process and the back-blowing dust removal process are carried out simultaneously, SO that the problem of the flue gas SO of the current coal-fired power plant is solved3The sampling method has the problems that the sampling pipe is easy to block and the sampling process is discontinuous, and realizes the purpose of ensuring the SO at the smoke outlet of the chimney of the coal-fired power plant3Sampling is carried out continuously.
Claims (7)
1. Chimney exhaust port SO of coal-fired power plant3Continuous type sampling device, its characterized in that: comprises a high-temperature sampling probe rod (1), a mounting flange (2) and a sampling box body shell (7); the high-temperature sampling probe rod (1) extends into a chimney to discharge smokeIn the port (11), the high-temperature sampling probe rod (1) is fixed on a chimney smoke outlet (11) through a mounting flange (2), and the outer end of the high-temperature sampling probe rod (1) is connected with a sampling box shell (7);
the high-temperature sampling probe rod (1) comprises a first alloy filter (101), a second alloy filter (102), a first inner tube (103), a second inner tube (104), a first quartz filter element (105) and a second quartz filter element (106); the alloy filter I (101) is communicated with one end of the inner tube I (103), and the other end of the inner tube I (103) is connected with the quartz filter core I (105) to form a sampling channel; the second alloy filter (102) is communicated with one end of the second inner tube (104), and the other end of the second inner tube (104) is connected with the second quartz filter element (106) to form a sampling channel;
a first back-blowing electromagnetic valve (3), a second back-blowing electromagnetic valve (4), a first back-blowing pipeline (5), a second back-blowing pipeline (6), a temperature controller (9) and a time controller (10) are arranged in the sampling box body shell (7); the first blowback pipeline (5) and the second blowback pipeline (6) are communicated with compressed air; a first blowback electromagnetic valve (3) is arranged at the joint of the inner pipe I (103) and the first blowback pipeline (5) as well as the sampling outlet (8), and a second blowback electromagnetic valve (4) is arranged at the joint of the inner pipe II (104) and the second blowback pipeline (6) as well as the sampling outlet (8); the time controller (10) is connected with the first back-blowing electromagnetic valve (3) and the second back-blowing electromagnetic valve (4).
2. The coal fired power plant chimney flue SO of claim 13Continuous type sampling device, its characterized in that: the two sampling channels of the high-temperature sampling probe rod (1) are wrapped in the heating insulation layer (107).
3. The coal fired power plant chimney flue SO of claim 23Continuous type sampling device, its characterized in that: the heating and insulating layer (107) is connected with a temperature controller (9).
4. The coal fired power plant chimney flue SO of claim 13Continuous type sampling device, its characterized in that: the mounting flange (2) comprises a flange sleeve (201) and a fixing screw (202); the flange sleeve (201) is fixed on the outer surface of the chimney smoke outlet (11), and the flange sleeve (201) is sleeved outside the high-temperature sampling probe rod (1)The flange sleeve (201) and the high-temperature sampling probe rod (1) are fastened through a fixing screw (202).
5. The coal fired power plant chimney smoke vent SO of claim 13The working method of the continuous sampling device is characterized by comprising the following steps:
s1, mounting an installation flange (2) on the outer surface of a chimney smoke outlet (11) of a coal-fired power plant, fixing a high-temperature sampling probe rod (1) on the chimney smoke outlet (11) through the installation flange (2), and adjusting the length of the high-temperature sampling probe rod (1) extending into the chimney smoke outlet (11) by moving the relative position of the high-temperature sampling probe rod (1) and the installation flange (2); when the device is operated, the temperature of the temperature controller (9) is set, and the heating heat-insulating layer (107) is heated, maintained in the set temperature range and kept stable;
s2, after the temperature is stable, sampling is started, a first blowback pipeline (5) and a second blowback pipeline (6) are connected with compressed air, a time controller (10) controls the first blowback electromagnetic valve (3) to be in a closed state, and the second blowback electromagnetic valve (4) is in an open state, under the condition, a sampling channel where the first inner pipe (103) is located is in an unblocked state, and a sampling channel where the second inner pipe (104) is located is in a closed state; under the suction action, the flue gas SO of the smoke outlet (11) of the chimney3The sample is taken through a sampling channel where the inner pipe I (103) is located and enters the analyzer through a sampling outlet (8); because the second back-blowing electromagnetic valve (4) is in an open state, the second back-blowing pipeline (6) is unblocked, and compressed air purges the second quartz filter element (106), the second inner tube (104) and the second alloy filter (102) to clean fly ash;
s3, after T time, the time controller (10) controls the first blowback electromagnetic valve (3) and the second blowback electromagnetic valve (4) to switch states, under the condition, the sampling channel where the first inner tube (103) is located is in a closed state, and the sampling channel where the second inner tube (104) is located is in an unblocked state; under the suction action, the flue gas SO of the smoke outlet (11) of the chimney3The sample is taken through the sampling channel where the inner tube II (104) is positioned and enters the analyzer through the sampling outlet (8); because the first blowback electromagnetic valve (3) is in an open state, the first blowback pipeline (5) is unblocked, and the compressed air carries out the treatment on the first quartz filter element (105) and the first inner tube (1)03) Purging with an alloy filter I (101) to clean fly ash;
and S4, after the T time, the time controller (10) controls the first back-blowing electromagnetic valve (3) and the second back-blowing electromagnetic valve (4) to switch states, and the sampling back-blowing work of the step S2 is repeated to cyclically perform sampling and blowing.
6. The coal fired power plant chimney flue SO of claim 53The working method of the continuous sampling device is characterized in that: in step S1, the temperature controller (9) controls the temperature of the heating and insulating layer (107) to be within the range of 80-500 ℃.
7. The coal fired power plant chimney flue SO of claim 53The working method of the continuous sampling device is characterized in that: in step S3 and step S4, the T time is 1-24 h.
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| CN202111067714.0A CN113804515A (en) | 2021-09-13 | 2021-09-13 | Chimney exhaust port SO of coal-fired power plant3Continuous sampling device and method |
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