CN112362417B - A double-pulse differential phase-puffing smoke sampling device and method - Google Patents
A double-pulse differential phase-puffing smoke sampling device and method Download PDFInfo
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- CN112362417B CN112362417B CN202011315578.8A CN202011315578A CN112362417B CN 112362417 B CN112362417 B CN 112362417B CN 202011315578 A CN202011315578 A CN 202011315578A CN 112362417 B CN112362417 B CN 112362417B
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- 239000000779 smoke Substances 0.000 title claims abstract description 70
- 238000005070 sampling Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007664 blowing Methods 0.000 claims abstract description 71
- 239000007789 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 27
- 239000003546 flue gas Substances 0.000 claims abstract description 27
- 239000000428 dust Substances 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000010926 purge Methods 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 239000004071 soot Substances 0.000 description 10
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- -1 NOx Chemical compound 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- 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)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A double pulse difference opposite blowing smoke sampling device and method is composed of back blowing sampling period and non-back blowing sampling period alternately, a period sampler runs continuously, smoke is sucked from an inlet of an inner pipe and discharged from an outlet of the sampler, and a back blowing pulse valve and a back sucking pulse valve are closed in the non-back blowing period. The flue gas enters the inner tube inlet after entering the inner cavity from the outer surface of the smoke filter and being collected. The back-blowing pulse valve is opened for delta T1 time, the gas in the back-blowing preheating pipe enters the inner cavity of the smoke filter, dust accumulated on the outer surface of the smoke filter is back-blown, and the gas entering the inlet of the inner pipe is the smoke in the inner cavity. And when the deltaT 1 is finished, the back suction pulse valve is opened for deltaT 2, the gas in the inner cavity flows to the vacuum tank, and the smoke enters the inner cavity through the smoke filter. The invention can realize back blowing without interrupting sampling, realize truly continuous flue gas sampling, and provide conditions for improving the environmental protection monitoring level and the control quality of the environmental protection device.
Description
Technical Field
The invention relates to a smoke sampling device and method, in particular to a double-pulse difference opposite blowing smoke sampling device and method.
Background
The Continuous Emission Monitoring System (CEMS) of flue gas mainly uses the principle of extraction method, the monitoring system of this principle needs to filter the dust in the sample gas at first, the common practice is to adopt the high-temperature ceramic or metal filter core, when the dust of filter core surface accumulates to certain thickness, carry on one time and blow back with the compressed air, lasting about 2 minutes usually. During blowback, sampling is discontinued during which flue gas analysis is suspended. Because the operation control of the environmental protection systems such as denitration, desulfurization and the like requires the numerical values of the components of the flue gas such as NOx, SO 2 and the like, the sampling analysis interruption caused by long-time back blowing can cause adverse effect on the control of the environmental protection systems, and the CEMS used for monitoring the environmental protection of the total discharge port is subjected to back blowing, during which the pollutant emission data are lost.
Disclosure of Invention
The invention aims to solve the problems and provide a double-pulse difference opposite-blowing smoke sampling device and a double-pulse difference opposite-blowing smoke sampling method, which can realize uninterrupted sampling while back blowing, realize truly continuous smoke sampling and provide conditions for improving the environmental protection monitoring level and the control quality of an environmental protection device.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The utility model provides a double pulse is poor to blow flue gas sampling device in opposite directions, including blowback buffer tank, blowback preheating tube, the vacuum tank, the smoke and dust filter, the inner tube and install the probe base on the flue wall, be provided with the inner tube support cover on the probe base, the inner tube support cover links to each other with the smoke and dust filter, inner tube one end wears out the inner tube support cover, the other end stretches into in the smoke and dust filter, the export of blowback buffer tank is linked together with the entry of blowback preheating tube through blowback pulse valve, the export of vacuum tank is linked together with the entry of blowback preheating tube through the blowback pulse valve, the export of blowback preheating tube is linked together with the inner chamber of smoke and dust filter, the inner tube one end that wears out the inner tube support cover links to each other with the sampler.
The invention is further improved in that the blowback buffer tank inlet of the blowback buffer tank is connected with the compressed air system.
The invention is further improved in that the vacuum tank inlet of the vacuum tank is connected to the suction pump.
The invention is further improved in that a tee joint is arranged at the outlet of the connected back-blowing preheating pipe, one outlet of the tee joint is connected with the inner pipe supporting sleeve, and the other outlet of the tee joint is connected with the inner cavity of the smoke filter.
The invention is further improved in that the inner tube support sleeve comprises a metal outer protective tube and an inner heat insulating material disposed within the metal outer protective tube.
The invention is further improved in that a sealing structure is arranged between the inner tube and the metal outer protective tube.
The invention is further improved in that the smoke filter is a cylindrical ceramic filter with a filtering precision of 1 micron, one end of the smoke filter is a closed end, and the other end is an open end.
A further development of the invention is that the inner tube is arranged on the centre line of the soot filter.
The invention is further improved in that the back blowing pulse valve and the back sucking pulse valve are both connected with a controller, one end of the inner tube penetrating out of the inner tube supporting sleeve is connected with a sampling tube through a pipeline, and the sampling tube is connected with a sampler.
The double pulse difference opposite blowing smoke sampling method based on the device comprises a back blowing sampling period and a non-back blowing sampling period which are alternately performed, wherein,
The specific process of the non-blowback sampling period is that the blowback pulse valve and the blowback pulse valve are closed, and the flue gas enters the inner cavity from the outer surface of the smoke filter and then enters the inner pipe inlet after being collected, and enters the sampler through the inner pipe;
The specific process of the back-flushing cycle is that a back-flushing pulse valve is opened and lasts for delta T1 time, preheated gas in a back-flushing preheating pipe enters an inner cavity, the pressure of the inner cavity is increased, dust accumulated on the outer surface of a smoke filter is back-flushed, and smoke in the inner cavity moves towards the closed end of the smoke filter and enters a sampler through an inner pipe;
And when the time delta T1 is over, the back suction pulse valve is opened for delta T2, the gas in the inner cavity flows to the vacuum tank through the back blowing preheating pipe, the pressure of the inner cavity is reduced, the smoke enters the inner cavity through the smoke filter and enters the sampler through the inner pipe, and after the time delta T2 is over, the non-back blowing sampling period is entered.
Compared with the prior art, the invention has the beneficial effects that:
According to the invention, the back-blowing buffer tank, the back-blowing preheating pipe, the vacuum tank, the smoke filter, the inner pipe and the probe base arranged on the wall surface of the flue are arranged, the inner pipe supporting sleeve is arranged on the probe base, the inner pipe supporting sleeve is connected with the smoke filter, one end of the inner pipe penetrates out of the inner pipe supporting sleeve, the other end of the inner pipe stretches into the smoke filter, the outlet of the back-blowing buffer tank is communicated with the inlet of the back-blowing preheating pipe through the back-blowing pulse valve, the outlet of the vacuum tank is communicated with the inlet of the back-blowing preheating pipe through the back-sucking pulse valve, the outlet of the back-blowing preheating pipe is communicated with the inner cavity of the smoke filter, one end of the inner pipe penetrating out of the inner pipe supporting sleeve is connected with the sampler, so that real continuous smoke sampling is realized, and conditions are provided for improving the environment-friendly monitoring level and the control quality of the environment-friendly device.
The continuous sampling is alternately composed of a blowback sampling period and a non-blowback sampling period. All the periodic samplers continuously operate, the smoke is continuously sucked in from the inlet of the inner tube, the smoke is discharged from the outlet of the samplers, and the discharged smoke enters the analyzer. In the non-blowback period, both the blowback pulse valve and the suck-back pulse valve are closed. The flue gas enters the inner tube inlet after entering the inner cavity from the outer surface of the smoke filter and being collected. The blowback cycle includes 1 purge pulse and 1 suck-back pulse. The two pulses are in the difference phase, continuous in time but not overlapping. At the beginning of the purge, the blowback pulse valve is opened for a period of deltat 1, during which the preheated gas in the blowback preheating pipe rapidly enters the inner cavity of the soot filter, the pressure in the inner cavity increases, dust accumulated on the outer surface of the soot filter is blowback, and at the same time, the flue gas in the inner cavity moves rightward, but during deltat 1, the gas entering the inlet of the inner pipe is still the flue gas in the original inner cavity. And when the deltaT 1 is finished, the back suction pulse valve is opened for deltaT 2, gas in the inner cavity rapidly flows to the vacuum tank through the back blowing preheating pipe, the pressure in the inner cavity rapidly decreases, the smoke rapidly enters the inner cavity through the smoke filter, and when the deltaT 2 is finished, the inner cavity is filled with the smoke. During Δt2, the gas entering the inlet of the inner tube remains as flue gas. And after the delta T2 is finished, entering a non-blowback sampling period. In this way, in all continuous sampling processes, the gas entering the inlet of the inner tube is flue gas, so that the aim of full-time sampling is fulfilled.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
The device comprises a 1-blowback buffer tank, a 2-blowback pulse valve, a 3-probe base, a 4-flue inner wall, a 5-blowback preheating pipe, a 6-vacuum tank, a 7-blowback pulse valve, an 8-inner pipe supporting sleeve, a 9-smoke filter, a 10-inner cavity, an 11-inner pipe inlet, a 12-blowback gas terminal point, a 13-inner pipe, a 14-sampler, a 15-sampling pipe, a 16-vacuum tank inlet, a 17-blowback buffer tank inlet and a 18-controller.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the double pulse difference back-blowing flue gas sampling device of the invention comprises a back-blowing buffer tank 1, a back-blowing pulse valve 2, a probe base 3, a back-blowing preheating pipe 5, a vacuum tank 6, a back-suction pulse valve 7, an inner pipe supporting sleeve 8, a smoke filter 9, an inner pipe 13, a sampling pipe 15, a sampler 14, a vacuum tank inlet 16, a back-blowing buffer tank inlet 17, a controller 18 and the like. The device comprises a probe base 3, a back-blowing buffer tank 1, a vacuum tank 6, a back-blowing preheating pipe 5, an inner pipe support sleeve 8, a thin-wall metal outer protective pipe and an inner heat insulation material, wherein the probe base 3 is used for installing the back-blowing buffer tank on the flue wall 4, the inlet 17 of the back-blowing buffer tank is connected with an external compressed air system, the inlet 16 of the vacuum tank is connected with an external air pump, the outlets of the back-blowing buffer tank 1 and the vacuum tank 6 are respectively connected with the inlet of the back-blowing preheating pipe 5 after being connected in parallel through a back-blowing pulse valve 2 and a back-sucking pulse valve 7, the outlets of the back-blowing preheating pipe 5 are connected with the open end of a smoke filter 9 and the inner pipe support sleeve 8 in a three-way mode, the inner pipe support sleeve 8 is connected with the smoke filter 9 and is positioned on the same straight line, the inner pipe support sleeve 8 is arranged on the probe base 3, the inner pipe support sleeve 8 comprises the thin-wall metal outer protective pipe and the inner heat insulation material is arranged in the thin-wall metal outer protective pipe, the smoke filter 9 is an elongated cylindrical ceramic filter with the filtering precision of 1 micrometer, one end is closed, and the other end is opened. The inner tube 13 is positioned on the center line of the soot filter 9 by the inner tube support sleeve 8, i.e., one end (inner tube outlet) of the inner tube 13 passes out of the inner tube support sleeve 8, and the other end (inner tube inlet 11) extends into the soot filter 9 and is close to the inner wall of the soot filter 9. An inner cavity 10 is formed between the inner pipe 13 and the inner wall of the smoke filter 9, and a sealing structure is arranged between the inner pipe 13 and the inner pipe support sleeve 8, so that the inner cavity 10 is sealed and isolated from the outside air;
The smoke filter 9 is fixedly connected with the probe base 3 through the inner pipe supporting sleeve 8, the inner pipe 13 is a thin pipe made of stainless steel or quartz, the inlet end of the inner pipe 13 is close to the inner wall of the closed end of the smoke filter 9, and the interval of 6-10mm is reserved. The outlet of the inner tube 13 is connected with the inlet of the sampler 14 through a sampling tube 15. The sampler 14 comprises an air pump and a flue gas condensation dehumidifier, and the flue gas discharged by the sampler 14 is supplied to a downstream flue gas analyzer.
The invention discloses a double-pulse difference opposite-blowing smoke sampling method, which comprises the following steps of:
in operation, the vacuum tank 6 is kept at a negative pressure of-80 kPa or less by an external air pump, and the blowback buffer tank 1 is kept at a positive pressure by an external compressed air system, typically between 100 and 300 kPa.
The continuous sampling is alternately composed of a blowback sampling period and a non-blowback sampling period. All the periodic samplers 14 are continuously operated, the sample gas is continuously sucked in from the inner pipe inlet 11, the sample gas is discharged from the outlet of the samplers 14, and the discharged sample gas enters the analyzer.
During the non-blowback period, both the blowback pulse valve 2 and the suck-back pulse valve 7 are closed. The flue gas enters the inner tube inlet 11 from the outer surface of the soot filter 9 and enters the inner cavity 10 after being collected. The non-blowback sampling period length is determined according to the characteristics of the smoke filter 9 and the smoke concentration in the smoke. The outer surface of the soot filter 9 is the blowback gas end point 12.
The blowback cycle includes 1 purge pulse (width Δt 1) and 1 suck-back pulse (cycle Δt 2). The two pulses are in the difference phase, continuous in time but not overlapping.
At the beginning of the purge, the blowback pulse valve 2 is opened for a period of Δt1, during which the preheated gas in the blowback preheating tube 5 rapidly enters the inner chamber 10, the pressure in the inner chamber 10 increases, dust accumulated on the outer surface of the soot filter 9 is blowback, and at the same time, the sample gas in the inner chamber 10 moves toward the closed end of the soot filter 9, but during the period of Δt1, the gas entering the inner tube inlet 11 is still the sample gas in the inner chamber 10 at the beginning.
At the end of the period delta T1, the back suction pulse valve 7 is opened for the period delta T2, the gas in the inner cavity 10 flows to the vacuum tank 6 through the back blowing preheating pipe 5 quickly, the pressure in the inner cavity 10 drops quickly, the smoke enters the inner cavity 10 through the smoke filter 9 quickly, the inner cavity 10 is filled with sample gas at the end of the period delta T2, and the gas entering the inner pipe inlet 11 is still the sample gas during the period delta T2.
And after the delta T2 time is over, entering a non-blowback sampling period. In this way, in all continuous sampling processes, the gas entering the inner pipe inlet 11 is the sample gas, so that the purpose of full-time sampling is achieved.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315578.8A CN112362417B (en) | 2020-11-21 | 2020-11-21 | A double-pulse differential phase-puffing smoke sampling device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011315578.8A CN112362417B (en) | 2020-11-21 | 2020-11-21 | A double-pulse differential phase-puffing smoke sampling device and method |
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| Publication Number | Publication Date |
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| CN112362417A CN112362417A (en) | 2021-02-12 |
| CN112362417B true CN112362417B (en) | 2025-02-14 |
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| CN202011315578.8A Active CN112362417B (en) | 2020-11-21 | 2020-11-21 | A double-pulse differential phase-puffing smoke sampling device and method |
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| CN113899595A (en) * | 2021-11-11 | 2022-01-07 | 西安热工研究院有限公司 | A purging and flushing switching device and method for flue gas sampling |
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| CN202974730U (en) * | 2012-12-27 | 2013-06-05 | 铜陵蓝光电子科技有限公司 | Flue gas sampler with heating and back-blowing functions |
| CN210953810U (en) * | 2019-06-26 | 2020-07-07 | 华电国际电力股份有限公司技术服务分公司 | Carbon dioxide emission monitoring system based on flue measurement |
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|---|---|---|---|---|
| CN202974730U (en) * | 2012-12-27 | 2013-06-05 | 铜陵蓝光电子科技有限公司 | Flue gas sampler with heating and back-blowing functions |
| CN210953810U (en) * | 2019-06-26 | 2020-07-07 | 华电国际电力股份有限公司技术服务分公司 | Carbon dioxide emission monitoring system based on flue measurement |
| CN213456302U (en) * | 2020-11-21 | 2021-06-15 | 西安热工研究院有限公司 | Double-pulse differential opposite-blowing smoke sampling device |
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