CN110887709A - Self-suction CEMS multi-point flue gas sampling device and control method - Google Patents
Self-suction CEMS multi-point flue gas sampling device and control method Download PDFInfo
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- CN110887709A CN110887709A CN201911227318.2A CN201911227318A CN110887709A CN 110887709 A CN110887709 A CN 110887709A CN 201911227318 A CN201911227318 A CN 201911227318A CN 110887709 A CN110887709 A CN 110887709A
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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
- G01N1/02—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
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Abstract
The invention provides a self-suction CEMS multipoint flue gas sampling device and a control method, aiming at overcoming the problems of long sampling time and measurement lag, a sampling pipe is connected to an outlet flue of an air preheater, the characteristic that the outlet flue pressure of an air compressor is 1-2KPa lower than the outlet pressure of a denitration reactor is utilized, the pressure difference is far greater than the pressure head of a sampling pump, flue gas can naturally and rapidly flow by means of the pressure difference, the rapid replacement of the flue gas in the sampling pipe is realized, the sampling lag is eliminated, and the flue gas sampling speed is formed by means of the flue gas pressure difference of the denitration outlet and the outlet of the air preheater instead of the sampling pump. Furthermore, before the sampling pipe pipeline passes through a sampling pump of the CEMS, a sampling branch pipe is connected, and flue gas is pumped by the sampling pump to enter a CEMS analyzer, and experiments prove that the sampling time can be shortened by more than 90%.
Description
Technical Field
The invention relates to the field of thermal control instruments, in particular to a self-suction CEMS multipoint flue gas sampling device and a control method.
Background
NOx control has been a difficult problem for thermal power plant pollutant emission control. On one hand, the smoke sampling time is long due to the reasons that the smoke pumping speed is low only by a sampling pump with limited output, a sampling pipeline is long, and the like, and the CEMS measurement lag is 1-2 minutes; on the other hand, because the straight pipe section of the flue is short, the flow field of the flue gas is uneven, the turbulence of the flue gas is serious and the like, the flue gas sampling is not representative, and the CEMS measurement cannot truly reflect the content of the flue gas. The denitration ammonia injection control of the thermal power generating unit is difficult due to the two reasons. In order to avoid excessive emission, most power plants adopt a control mode of excessive ammonia injection, so that the ammonia injection cost is greatly increased, and the risk of blockage of an air preheater exists.
Disclosure of Invention
Two insurmountable disadvantages exist between prior art solutions:
1. the smoke is extracted only by the sampling pump with limited output, the output of the sampling pump is limited, the sampling pipeline is long, the smoke sampling time is long, the CEMS measurement lag is 1-2 minutes, and when the smoke is sent to an analyzer, the smoke components in a flue are changed frequently.
2. The flue straight pipe section is short, the flue gas flow field is uneven, the flue gas turbulence is serious, the insertion depth of the probe is short, the flue gas sampling is not representative, and the CEMS measurement cannot truly reflect the flue gas content.
The invention specifically adopts the following technical scheme:
the utility model provides a from inhaling formula CEMS multiple spot flue gas sampling device which characterized in that: the sampling pipe is respectively connected with the outlet flue of the air preheater, the outlet flue of the denitration reactor and the sampling pump.
Preferably, the sampling pipe is provided with a sampling branch pipe connected with the CEMS analyzer between the outlet flue of the denitration reactor and the sampling pump.
Preferably, denitration reactor export flue side, air preheater export flue side and the sampling pump side of sampling tube are provided with respectively and connect PLC: the first purging switching solenoid valve, the second purging switching solenoid valve and the sampling solenoid valve; the sampling electromagnetic valve is also respectively connected with the CEMS analyzer and the purging gas source.
Preferably, the sampling structure that the sampling pipe stretches into denitration reactor outlet flue includes: a plurality of sampling points fitted with extension tubes; the extension tube on each sampling point extends into 1/2 depth beyond the flue; a plurality of the sampling points are respectively connected with a mixing tank, and the mixing tank is connected with a sampling tube.
Preferably, the plurality of sampling points includes three sampling points located at stack cross directions 1/4, 1/2, and 3/4.
Preferably, each extension tube is fixed by a reducer arranged on the protective sleeve to form an extension of the sampling branch tube at each sampling point; the extension pipe is provided with a plurality of sampling holes downwards; the protective sleeve is arranged on the outlet flue wall of the denitration reactor through a flange.
Preferably, the number of sampling holes on each extension tube is 4-8.
Preferably, a secondary filter screen and a loop isolation valve are arranged between each sampling branch pipe and the mixing tank.
Preferably, a flue gas flow regulating valve is mounted on a sampling pipe between the second purging switching electromagnetic valve and the outlet flue of the air preheater.
And a control method according to the above preferred apparatus, characterized in that:
when the sampling operation is executed: the sampling electromagnetic valve is connected with the CEMS analyzer, and the first purging switching electromagnetic valve and the second purging switching electromagnetic valve are both opened;
when the upper pipeline purging operation is executed: the sampling electromagnetic valve is connected with a purging gas source, the first purging switching electromagnetic valve is opened, and the second purging switching electromagnetic valve is closed;
when the lower pipeline purging operation is executed: the sampling electromagnetic valve is connected with a purging gas source, the first purging switching electromagnetic valve is opened, and the second purging switching electromagnetic valve is closed.
The invention and the optimized proposal thereof overcome the important defects existing in the prior art:
in order to overcome the problems of long sampling time and measurement lag, a sampling pipe is connected to an outlet flue of an air preheater, the characteristic that the pressure of the outlet flue of the air preheater is 1-2KPa lower than that of the outlet of a denitration reactor is utilized, the pressure difference is far greater than the pressure head of a sampling pump, smoke can naturally and rapidly flow by means of the differential pressure, rapid replacement of the smoke in the sampling pipe is realized, the sampling lag is eliminated, and the smoke sampling speed is enabled to not only depend on the sampling pump but also depend on the smoke pressure difference of the outlet of the denitration reactor and the outlet of the air preheater to form natural circulation of. Furthermore, before the sampling pipe pipeline passes through a sampling pump of the CEMS, a sampling branch pipe is connected, and flue gas is pumped by the sampling pump to enter a CEMS analyzer, and experiments prove that the sampling time can be shortened by more than 90%.
In order to overcome the problem that sampling is not representative, a multi-point sampling and mixing mode is adopted, sampling points are transversely increased, sampling depth is longitudinally increased, and multi-point sampling is achieved. The specific method is that a sampling point is added at 1/4 and 3/4 in the transverse direction of the flue, and 3 sampling points are formed by adding the sampling point at 1/2. Meanwhile, an extension pipe is adopted at each sampling point to extend to a position exceeding the depth 1/2 of the flue, 4-8 holes are formed in the lower part of the extension pipe to realize multi-point sampling, and the sampled flue gas is introduced into a mixing tank to fully mix the flue gas so as to realize the representativeness of the sampled flue gas.
Meanwhile, secondary filtration is added to prevent dust from entering a CEMS system; an isolation valve is added to realize online maintenance; a flow regulating valve is added, so that the condensation of a pipeline is avoided, and the service life of a filter screen is prolonged; the separated extension sampling probe is adopted, so that the extension pipe does not influence the maintenance of the sampling probe, and the probe can be separated; the lower part of the extension pipe is provided with a hole, so that dust is reduced, and multi-point sampling is realized; and a purging double-switching solenoid valve is also designed, so that the full-pipeline purging of the sampling pipeline is realized.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic diagram of the overall structure of the embodiment of the present invention;
FIG. 3 is a schematic diagram of a sampling structure according to an embodiment of the present invention;
in the figure: 1-sampling tube; 2-a sampling electromagnetic valve; 3-a sampling pump; 4-a purge gas source; 5-a first purge switching solenoid valve; 6-a second purge switching solenoid valve; 7-flue gas flow regulating valve; 8-an extension tube; 9-reducer; 10-a secondary filter screen; 11-a loop isolation valve; 12-a mixing tank; 13-a protective sleeve; 14-flange.
Detailed Description
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
as shown in figure 1, in the CEMS flue gas sampling device produced by various large CEMS equipment manufacturers, the depth of a sampling pipe inserted into a flue is less than 2m, and the flue gas is extracted by power supplied by a sampling pump.
As shown in fig. 2 and fig. 3, in the scheme provided in this embodiment, in order to overcome the problems of long sampling time and measurement lag, the sampling tube 1 is connected to the outlet flue of the air preheater, and by utilizing the characteristic that the outlet flue pressure of the air compressor is 1-2KPa lower than the outlet flue pressure of the denitration reactor, the pressure difference is much greater than the pressure head of the sampling pump 3, and the flue gas can naturally and rapidly flow by virtue of the pressure difference, so that the rapid replacement of the flue gas in the sampling tube 1 is realized, and the sampling lag is eliminated. Before the pipeline of the sampling pipe 1 passes through the sampling pump 3 of the CEMS, a branch pipe is connected, and the sampling pump 3 pumps the flue gas to enter the CEMS analyzer, which is verified by experiments, so that the sampling time can be shortened by more than 90%.
In order to overcome the problem that sampling is not representative, a multi-point sampling and mixing mode is adopted, sampling points are transversely increased, sampling depth is longitudinally increased, and multi-point sampling is achieved. The specific method is to add a sampling point at each of the transverse directions 1/4 and 3/4 of the flue (in fig. 2, 3 sampling points are seen to be in the vertical direction, but are only schematic diagrams for easy understanding, and actually, 3 sampling points are horizontally arranged in the transverse direction), and add the sampling points at the original 1/2 to form 3 sampling points. Meanwhile, each sampling point extends to a position exceeding the flue depth 1/2 through the extension pipe 8, 4-8 holes are formed in the lower portion of the extension pipe 8 to realize multi-point sampling, and sampling flue gas is introduced into the mixing tank 12 to be fully mixed so as to realize representativeness of the sampling flue gas.
In order to ensure the long-term stable operation of the sampling device, the device is improved and optimally designed according to the following steps besides rapidity and representativeness:
1. secondary filtration and on-line maintenance
Because the sample flue gas flow that improves through this embodiment scheme can the grow a lot, and the inspiratory capacity of dust also increases thereupon, for preventing that sampling tube 1 pipeline from blockking up, each sample at every sampling point is in charge of and respectively increases second grade filter screen 10 before getting into blending tank 12 to further purify sample gas purity, the protection instrument prevents to block up. And a loop isolation valve 11 is added between the secondary filter screen 10 and the mixing tank 12, and when maintenance is needed, the loop isolation valve 11 is directly closed, so that online isolation maintenance is realized.
2. The extension tube does not affect the maintenance of the sampling probe, and the probe can be separated
Because the flue gas dust content is big, and the operating mode is relatively poor, and sampling probe need regularly extract to maintain. In order to ensure that the sampling tube 1 can be taken out and maintained, as shown in fig. 3, the present embodiment adopts a mounting mode in which the sampling branch tube and the extension tube 8 can be separated, the extension tube 8 is welded on the protective sleeve 13 through the reducer 9, and is not fixedly connected with the sampling branch tube, because the protective sleeve 13 is connected with the flue wall through the flange 14, the disassembly is convenient, and thus the sampling probe can be kept in a detachable state.
3. The bottom of the extension pipe is provided with a hole to reduce dust suction
The opening of the extension pipe 8 is arranged at the bottom, so that the two advantages are that one is a leeward side, and the other is that the opening faces downwards, and dust can be prevented from entering the extension pipe 8.
4. Double-purging switching valve for realizing full pipeline purging
In order to prevent the sampling pipe 1 from being blocked and realize the sampling full-pipeline purging, the purging switching electromagnetic valves, namely the first purging switching electromagnetic valve 5, the second purging switching electromagnetic valve 6 and the sampling electromagnetic valve 2, are respectively added in front of and behind the CEMS sampling pipeline and are controlled by the CEMS back-flushing PLC. When the purging instruction is sent out, the CEMS system performs back flushing on the sampling pipe 1 by using the purging gas, and the first purging switching electromagnetic valve 5 and the second purging switching electromagnetic valve 6 are used for switching purging branches. During purging, one of the 2 purge switching solenoid valves is opened, and the other purge switching solenoid valve is closed. When the first purging switching electromagnetic valve 5 is opened, the pipeline from the CEMS to the outlet of the denitration reactor is purged, and when the second purging switching electromagnetic valve 6 is opened, the pipeline from the CEMS to the outlet of the air preheater is purged, so that pipeline blockage is avoided. During sampling, both the solenoid valves are in an open state. The working state table of the electromagnetic valve under different working states is as follows:
| purge sampling state | Sampling electromagnetic valve | First purge switching solenoid valve | Second purging switching electromagnetic valve |
| Sampling | General CEMS | Open | Open |
| Upper pipeline purging | |
Open | Close off |
| Lower pipeline purging | |
Close off | Open |
5. The flue gas flow is adjustable, the dewing of the pipeline is avoided, and the service life of the filter screen is prolonged
In order to avoid excessive smoke flowing and excessive smoke and dust suction, the service life of the filter screen is prolonged, and a smoke flow regulating valve 7 is additionally arranged in front of an air outlet close to the air preheater.
The present invention is not limited to the above preferred embodiments, and other various types of self-priming CEMS multi-point flue gas sampling devices and control methods can be obtained by anyone with the benefit of the present invention.
Claims (10)
1. The utility model provides a from inhaling formula CEMS multiple spot flue gas sampling device which characterized in that: the sampling pipe is respectively connected with the outlet flue of the air preheater, the outlet flue of the denitration reactor and the sampling pump.
2. The self-priming CEMS multipoint flue gas sampling device of claim 1, wherein: and a sampling branch pipe connected with a CEMS analyzer is arranged between the outlet flue of the denitration reactor and the sampling pump of the sampling pipe.
3. The self-priming CEMS multipoint flue gas sampling device of claim 1, wherein: denitration reactor export flue gas channel side, air preheater export flue gas channel side and the sampling pump side of sampling tube are provided with respectively and connect PLC: the first purging switching solenoid valve, the second purging switching solenoid valve and the sampling solenoid valve; the sampling electromagnetic valve is also respectively connected with the CEMS analyzer and the purging gas source.
4. The self-priming CEMS multipoint flue gas sampling device of claim 1, wherein: the sampling structure that the sampling tube stretched into denitration reactor export flue includes: a plurality of sampling points fitted with extension tubes; the extension tube on each sampling point extends into 1/2 depth beyond the flue; a plurality of the sampling points are respectively connected with a mixing tank, and the mixing tank is connected with a sampling tube.
5. The self-priming CEMS multipoint flue gas sampling device of claim 4, wherein: the plurality of sampling points includes three sampling points located at stack cross directions 1/4, 1/2, and 3/4.
6. The self-priming CEMS multipoint flue gas sampling device of claim 4, wherein: each extension tube is fixed through a reducer arranged on the protective sleeve to form extension of the sampling branch tube on each sampling point; the extension pipe is provided with a plurality of sampling holes downwards; the protective sleeve is arranged on the outlet flue wall of the denitration reactor through a flange.
7. The self-priming CEMS multipoint flue gas sampling device of claim 6, wherein: the number of sampling holes on each extension tube is 4-8.
8. The self-priming CEMS multipoint flue gas sampling device of claim 6, wherein: each sampling branch pipe and the mixing tank are provided with a secondary filter screen and a loop isolation valve between.
9. The self-priming CEMS multipoint flue gas sampling device of claim 3, wherein: and a flue gas flow regulating valve is arranged on the sampling pipe between the second purging switching electromagnetic valve and the outlet flue of the air preheater.
10. The method of claim 3 for controlling a self-priming CEMS multipoint flue gas sampling device, wherein:
when the sampling operation is executed: the sampling electromagnetic valve is connected with the CEMS analyzer, and the first purging switching electromagnetic valve and the second purging switching electromagnetic valve are both opened;
when the upper pipeline purging operation is executed: the sampling electromagnetic valve is connected with a purging gas source, the first purging switching electromagnetic valve is opened, and the second purging switching electromagnetic valve is closed;
when the lower pipeline purging operation is executed: the sampling electromagnetic valve is connected with a purging gas source, the first purging switching electromagnetic valve is opened, and the second purging switching electromagnetic valve is closed.
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| CN202110640831.5A CN113375987A (en) | 2019-12-04 | 2019-12-04 | Self-suction CEMS multi-point flue gas sampling device and control method |
| CN201911227318.2A CN110887709A (en) | 2019-12-04 | 2019-12-04 | Self-suction CEMS multi-point flue gas sampling device and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112657960A (en) * | 2020-12-16 | 2021-04-16 | 华能海南发电股份有限公司电力检修分公司 | One set of system that sweeps to denitration export net sampling device |
| CN113884345A (en) * | 2021-09-30 | 2022-01-04 | 上海北分科技股份有限公司 | Automatic sampling system and method for waste gas environment-friendly measurement |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114984756A (en) * | 2022-06-22 | 2022-09-02 | 华能国际电力股份有限公司上安电厂 | Ammonia spraying leveling system and method based on CEMS analyzer |
| CN115155362A (en) * | 2022-07-29 | 2022-10-11 | 西安热工研究院有限公司 | Dynamic large-range mixing system suitable for rectangular section channel |
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