CN111551403A - Continuous monitoring and sampling system for smoke emission - Google Patents
Continuous monitoring and sampling system for smoke emission Download PDFInfo
- Publication number
- CN111551403A CN111551403A CN202010434802.9A CN202010434802A CN111551403A CN 111551403 A CN111551403 A CN 111551403A CN 202010434802 A CN202010434802 A CN 202010434802A CN 111551403 A CN111551403 A CN 111551403A
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- Prior art keywords
- sampling
- flue gas
- gas
- tank
- branch pipes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure, temperature
Abstract
The invention relates to a continuous monitoring and sampling system for flue gas emission, wherein a plurality of flue gas sampling branch pipes are uniformly arranged on the side wall of a chimney, one ends of the flue gas sampling branch pipes extend into the chimney, the other ends of the flue gas sampling branch pipes penetrate through the top surface of a mixing tank to extend to the lower part of the mixing tank, a mixed gas outlet is arranged on the top surface of the mixing tank, the mixed gas outlet is connected with one end of a mixed gas pipe, the other end of the mixed gas pipe is connected with a sampling tank air inlet on the top surface of the sampling tank, a flue gas discharge port is arranged at the bottom of the sampling tank, a sampling port is arranged on the side surface of the sampling tank, the sampling port is connected with an inlet of an air extraction sampling pump, an outlet of the air extraction. The multipoint sampling method can reduce the problems of overlong total sampling time and inconsistent detection results with the whole condition in the flue caused by switching branch pipelines back and forth due to multipoint sampling while ensuring multipoint sampling.
Description
Technical Field
The invention belongs to the technical field of engineering measurement, relates to a flue gas sampling method, and particularly relates to a continuous monitoring and sampling system for flue gas emission.
Background
Along with the gradual increase of the attention degree of China to environmental protection and related industries, the unit concentration and the total amount of pollutant emission are greatly reduced, and the requirements on the continuous monitoring capability and the technical level of environmental protection and emission reduction equipment are higher and higher. In a flue with continuous emission of flue gas, the concentration of pollutants is not uniform, the flue gas sampling mode of China still takes single-point sampling as the main point according to GB/T16157-1996 'method for measuring particulate matters in exhaust gas of fixed pollution sources and sampling gaseous pollutants', and the sampling result has great limitation and uncertainty.
Through searching, the following relevant patent documents are found:
1. CN209446427U discloses an extraction type ultralow smoke concentration measuring instrument, which comprises an ultralow concentration particulate matter measuring device, a detection chamber, a smoke collecting pipe, a smoke return pipe and a heater; one end of the smoke collecting pipe extends into the chimney, the other end of the smoke collecting pipe is connected with the air inlet of the heater, and the air outlet of the heater is connected with the detection chamber; the ultra-low concentration particulate matter measuring device is arranged in the detection chamber, one end of the flue gas backflow pipe is connected with the detection chamber, and the other end of the flue gas backflow pipe extends into the chimney. The device has the advantages that the heater can change liquid water into gaseous water vapor, and the interference of the liquid water on the measurement of the concentration of the flue gas can be reduced; the laser receiving hole and the laser emitting hole are positioned on two opposite sides, so that low-concentration smoke can be measured, and the measurement precision is high.
The patent has the problems that: this patent is single-point sampling, and in the flue that the flue gas discharged in succession, the concentration of pollutant is not even, and single-point sampling is influenced by the position of sample, and there is very big limitation and uncertainty in the result of sample.
2. CN204479546U discloses a sampling pump-free flue gas concentration measurement system based on a grid arrangement method, which is used in the technical field of tail flue gas measurement of large coal-fired power plant boilers. From extraction flue gas of economizer export flue cross-section department, arrange multiunit sampling rifle and sample simultaneously according to the net method, every group sampling rifle contains the sampling pipe of a plurality of different length, sampling rifle export even as an organic whole to arrange adjusting device in the exit, guarantee the flue gas and through the homogeneous mixing behind the sampling rifle, follow the flue gas that the sampling rifle came out through mixing get back to the flue of air heater export after entering flue gas analyzer analysis, and with the data embedding that flue gas analyzer gathered to the power plant dispersion control system in, utilize the pressure drop of flue self, the in-process need not arrange the sampling pump, the work load of exempting from the system maintenance. The utility model has the characteristics of reasonable in design, convenient to use, simple structure, stable performance, little and economical and practical etc. of system maintenance work load.
The problem of this patent lies in: although the patent has gridding arrangement, all branch pipes are converged and then directly enter a flue gas analyzer, so that whether all branches are uniformly mixed or not is guaranteed, and the deviation between a detection structure and a true value is large; secondly, the heat-preservation heat tracing system is not arranged in the device, because the tail flue is basically saturated wet flue gas, a large amount of condensed water exists in the extracted flue gas after the flue gas is mixed due to the fact that the temperature of the extracted flue gas is reduced, SO2 and other pollutants which are easy to dissolve in water are distorted, and the error of a detection result is large.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a continuous monitoring and sampling system for flue gas emission, which can sample at multiple points and measure accurately.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a continuous monitoring and sampling system for fume emission comprises a fume sampling branch pipe, a mixing tank, a sampling tank, a fume analyzer, an air extraction sampling pump and an air extraction pump, a plurality of flue gas sampling branch pipes are uniformly arranged on the side wall of the chimney, one ends of the flue gas sampling branch pipes extend into the chimney, the other ends of the flue gas sampling branch pipes penetrate through the top surface of the mixing tank and extend to the lower part of the mixing tank, a mixed gas outlet is arranged on the top surface of the mixing tank, the mixed gas outlet is connected with one end of a mixed gas pipe, the other end of the mixed gas pipe is connected with a sampling tank gas inlet on the top surface of the sampling tank, the bottom of sampling jar is provided with exhanst gas port, is provided with the sample connection in the side of sampling jar, and the sample connection links to each other with the sample pump import of bleeding, and the sample pump export of bleeding links to each other with flue gas analyzer, and exhanst gas port links to each other with getting the air pump entry, gets the export of air pump and links to each other with chimney low reaches discharge port.
And the pipe orifices of the flue gas sampling branch pipes extending into the chimney are on the same horizontal plane, and the pipe orifices of the branch pipes are uniformly distributed on the horizontal plane.
And the installation position and the number of the flue gas sampling branch pipes are determined according to the size of a flue gas pipeline.
Moreover, a guide plate is arranged on the inner wall of the mixing tank.
And the flue gas sampling branch pipes are all provided with flow regulating valves.
The invention has the advantages and positive effects that:
1. the invention uses the method of multi-point sampling and mixing before sampling, can reduce the problems of overlong total sampling time and inconsistent detection result with the whole condition in the flue caused by switching branch pipelines back and forth due to multi-point sampling while ensuring multi-point sampling, simultaneously reduces the sampling time and improves the working efficiency.
2. The mixing tank and the sampling tank are both provided with heat preservation heat tracing, so that the distortion of measurement caused by the dissolution of soluble substances in the flue gas into water due to the formation of condensed water in the flue gas is effectively prevented, and the accuracy of measurement is ensured.
3. The invention returns the residual smoke in the gas taking tank to the flue through the gas taking pump, thereby forming a complete loop of smoke sampling, realizing continuous gas extraction and sampling, and avoiding the occurrence of inaccurate smoke measurement caused by dead gas left in the sampling tank.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein: 1-chimney, 2-flow regulating valve, 3-flue gas sampling branch pipe, 4-mixed gas outlet, 5-mixed gas pipe, 6-sampling tank gas inlet, 7-sampling port, 8-air extraction sampling pump, 9-flue gas analyzer, 10-sampling tank, 11-flue gas discharge port, 12-chimney downstream discharge port, 13-air extraction pump and 14-mixing tank.
Figure 2 is a cross-sectional view of the chimney of figure 1.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments, which are illustrative only and not limiting, and the scope of the present invention is not limited thereby.
A continuous monitoring and sampling system for flue gas emission comprises a flue gas sampling branch pipe 3, a mixing tank 14, a sampling tank 10, a flue gas analyzer 9, an air extraction sampling pump 8 and an air extraction pump 13, wherein a plurality of flue gas sampling branch pipes are uniformly arranged on the side wall of a chimney 1, one end of each flue gas sampling branch pipe extends into the chimney, the other end of each flue gas sampling branch pipe penetrates through the top surface of the mixing tank to extend to the lower part of the mixing tank, a mixed gas outlet 4 is arranged on the top surface of the mixing tank and is connected with one end of a mixed gas pipe 5, the other end of the mixed gas pipe is connected with a sampling tank air inlet 6 on the top surface of the sampling tank, a flue gas discharge port 11 is arranged at the bottom of the sampling tank, a sampling port 7 is arranged on the side surface of the sampling tank, the sampling port is connected with an inlet of, the outlet of the air-extracting pump is connected with the downstream discharge port 12 of the chimney.
The pipe orifices of the flue gas sampling branch pipes extending into the chimney are on the same horizontal plane, and the pipe orifices of the branch pipes are uniformly distributed on the horizontal plane.
The installation position and the number of the flue gas sampling branch pipes are determined according to the size of a flue gas pipeline.
The inner wall of the mixing tank is provided with a guide plate, and the gas is uniformly mixed in the gas mixing tank through a guide pipe.
And flow regulating valves 2 are respectively arranged on the flue gas sampling branch pipes.
The outer wall that above-mentioned pipeline and sample jar and blending tank related to all is provided with the heat tracing pipeline to the heat preservation is covered outward, guarantees that the flue gas can not influence the testing result of pollutant concentration because of the flue gas cooling.
The working principle of the invention is as follows:
a plurality of branch pipelines of bleeding are installed to same pipeline cross-section in the flue and are taken a sample (each branch pipeline mounted position and quantity are confirmed according to flue gas pipeline size), then it is unanimous to control each branch pipeline sample flow through the governing valve, and the flue gas of each branch road is unified to be remitted into the gas mixing tank that has the heating heat preservation function, through the guide plate with gas mixing in the gas mixing tank, again with the flue gas suction in the gas jar of getting that has the heating heat preservation function equally. The sampling exhaust tube is arranged in the gas taking tank, the gas sampling is carried out at a constant speed through the air extraction sampling pump, and then the gas is sent to the gas analyzer to obtain the concentration data of pollutants in the gas. The residual flue gas in the gas taking tank is sent back to the flue (the downstream position of the sampling point) through the gas taking pump, so that a complete loop of flue gas sampling is formed, and uninterrupted continuous gas extraction and sampling are realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (5)
1. The utility model provides a fume emission continuous monitoring sampling system which characterized in that: including flue gas sampling branch pipe, blending tank, sample jar, flue gas analyzer, air extraction sampling pump, get the gas pump, evenly be provided with many flue gas sampling branch pipes at the chimney lateral wall, inside flue gas sampling branch pipe one end extended the chimney, the top surface that the other end of flue gas sampling branch pipe passed the blending tank extended the lower part of blending tank, be provided with the gas mixture gas outlet at the top surface of blending tank, gas mixture pipe's one end was connected to the gas mixture gas outlet, the sample jar air inlet of sample jar top surface is connected to gas mixture pipe's the other end, be provided with the exhanst gas discharge port in the bottom of sample jar, be provided with the sample connection in the side of sample jar, the sample connection links to each other with the air extraction sampling pump import, air extraction sampling pump export links to each other with flue gas analyzer, gas discharge port.
2. The continuous monitoring and sampling system for flue gas emissions according to claim 1, characterized in that: the pipe orifices of the flue gas sampling branch pipes extending into the chimney are on the same horizontal plane, and the pipe orifices of the branch pipes are uniformly distributed on the horizontal plane.
3. The continuous monitoring and sampling system for flue gas emissions according to claim 1, characterized in that: the installation position and the number of the flue gas sampling branch pipes are determined according to the size of a flue gas pipeline.
4. The continuous monitoring and sampling system for flue gas emissions according to claim 1, characterized in that: and a guide plate is arranged on the inner wall of the mixing tank.
5. The continuous monitoring and sampling system for flue gas emissions according to claim 1, characterized in that: and flow regulating valves are arranged on the flue gas sampling branch pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010434802.9A CN111551403A (en) | 2020-05-21 | 2020-05-21 | Continuous monitoring and sampling system for smoke emission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010434802.9A CN111551403A (en) | 2020-05-21 | 2020-05-21 | Continuous monitoring and sampling system for smoke emission |
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| Publication Number | Publication Date |
|---|---|
| CN111551403A true CN111551403A (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010434802.9A Pending CN111551403A (en) | 2020-05-21 | 2020-05-21 | Continuous monitoring and sampling system for smoke emission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432823A (en) * | 2020-11-11 | 2021-03-02 | 上海邦有道商贸有限公司 | Sampling system for natural gas outward transportation main pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674631A (en) * | 2014-01-08 | 2014-03-26 | 国家电网公司 | Dual-pump flow-equalizing flue sampling device and sampling method |
| CN104132829A (en) * | 2014-06-24 | 2014-11-05 | 国家电网公司 | Flow-equalizing and sampling device for smoke |
| CN105891414A (en) * | 2014-12-26 | 2016-08-24 | 浙江浙能技术研究院有限公司 | Sampling-pump-free smoke concentration measurement method and device based on grid arrangement method |
| CN209132050U (en) * | 2018-09-04 | 2019-07-19 | 大唐陕西发电有限公司 | A kind of array multiple spot sampling smoke device |
| CN110849698A (en) * | 2019-12-23 | 2020-02-28 | 福建省特种设备检验研究院 | Large-scale boiler afterbody flue gas composition analysis front system |
-
2020
- 2020-05-21 CN CN202010434802.9A patent/CN111551403A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674631A (en) * | 2014-01-08 | 2014-03-26 | 国家电网公司 | Dual-pump flow-equalizing flue sampling device and sampling method |
| CN104132829A (en) * | 2014-06-24 | 2014-11-05 | 国家电网公司 | Flow-equalizing and sampling device for smoke |
| CN105891414A (en) * | 2014-12-26 | 2016-08-24 | 浙江浙能技术研究院有限公司 | Sampling-pump-free smoke concentration measurement method and device based on grid arrangement method |
| CN209132050U (en) * | 2018-09-04 | 2019-07-19 | 大唐陕西发电有限公司 | A kind of array multiple spot sampling smoke device |
| CN110849698A (en) * | 2019-12-23 | 2020-02-28 | 福建省特种设备检验研究院 | Large-scale boiler afterbody flue gas composition analysis front system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432823A (en) * | 2020-11-11 | 2021-03-02 | 上海邦有道商贸有限公司 | Sampling system for natural gas outward transportation main pipe |
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