CN206325405U - A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system - Google Patents
A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system Download PDFInfo
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- CN206325405U CN206325405U CN201621241961.2U CN201621241961U CN206325405U CN 206325405 U CN206325405 U CN 206325405U CN 201621241961 U CN201621241961 U CN 201621241961U CN 206325405 U CN206325405 U CN 206325405U
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- flue gas
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Abstract
A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system, including flue gas flow meter, scavenging pipeline and intelligent controller, scavenging pipeline is connected on the sampling house steward between sample gas blender and multiple spot flue gas sampler, after scavenging pipeline and compressed air communication, connected respectively by upper branch road and lower branch road and sampling house steward is connected to after a magnetic valve I and magnetic valve II, electric control valve and electric gate valve are provided with sampling house steward between upper branch road and lower branch road, electric gate valve from sample gas blender closer to, magnetic valve I and magnetic valve II are normally closed, electric gate valve is normally opened, the control signal regulation aperture that electric control valve is sent according to intelligent controller, flue gas flow meter is arranged on the sampling house steward after the parallel connection of multiple spot flue gas sampler, intelligent controller respectively with flue gas flow meter, magnetic valve I, magnetic valve II, electric control valve, electric gate valve and the connection of flue gas automatic monitored control system.The utility model can automatically control the flow velocity of sample gas, accomplish isokinetic sampling, it is possible to judge whether sample lines have clogging according to flue gas flow set in advance, and automatically control sample lines are purged.
Description
Technical field
The utility model is related to a kind of automatic control system of the flue gas sampler for boiler technology field, especially
A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system.
Background technology
The fuel of coal-burning boiler is in high-temp combustion, and itrogenous organic substance is oxidized generation nitrogen oxides (NOx), severe contamination
Atmospheric environment.For meet the requirement of environmental protection, nitrogen oxides in effluent (NOx) content of reduction boiler discharge is, it is necessary to carry out denitration
Processing.Catalysts selective reduction gas denitrifying technology (SCR) is to use vertical catalyst reaction tower and anhydrous ammonia, from flue gas
Middle removing NOx.Flue gas after denitration enters flue gas automatic monitored control system (CEMS) through over-sampling and carrys out continuous analysis measurement NOx content
With other chemical compositions, for instructing automatically controlling and environment monitoring for denitrating system.
Because Denitration in Boiler SCR rear pass area is very big, at this there is the distribution of each pollutant concentration in flue gas in theory
Uneven the problem of, former CMES probe positions are arranged on the middle part of vertical gas pass after denitration SCR, a sampled point insertion depth
1.2m, for the spot measurement on heavy in section, it is difficult to ensure that being respectively provided with representativeness under full working scope, causes SCR to export standard state NOx
Flue cross section average value deviates concentration.The flue gas of desulfurization outlet is by facilities such as air preheater, deduster, blower fan, desulfuration absorbing towers
After, NOx mixing ratios are more uniform, the NOx value that the point measurement is obtained close to flue cross section average value, so, spot measurement SCR goes out
The NOx of mouth has very big discreteness, it is impossible to which the closed-loop control to denitrating system provides accurate NOx concentration signal, in environmentally friendly number
There is larger difference according to the NOx in analysis, also showing as floss hole and denitration outlet.
The method of solution is to increase grid type multi-point sampling device in denitration SCR exhaust pass, arranges many in flue cross section
Individual sampled point, obtains flue gas sample and enters CEMS progress flue gases after mixing containing NOx analyses.
The flow velocity for obtaining sample gas from flue should be basically identical with flue gas flow rate in flue, when sample gas velocity is less than flue gas flow rate
When a lot, to flue gas analysis data can be caused delayed.Due in flue gas containing a large amount of dust (i.e. when the concentration of dust is more than or
Equal to 30mg/Nm3When), it is easy to sampler and gas collection pipe are blocked, now sample throughput will reduce, relevant tube when serious
Road is blocked by dust, sampling failure, it is also possible to cause the permanent of sample lines to scrap.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, the utility model provides a kind of novel denitration SCR outlets multiple spot flue gas
Sampling automatic control system, its measurement with flue gas flow and control function, can automatically control the flow velocity of sample gas, accomplish
Speed sampling, and it is less than nominal flow rate in sample gas velocity, intelligent controller judges that sample lines have clogging, and primer liner blows
Program is swept, the pipeline of sampling system can be avoided to be blocked by dust.
The utility model solve its technical problem use technical scheme be：
A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system, is provided with denitration SCR exhaust pass
Multiple spot flue gas sampler, multiple spot flue gas sampler is communicated to sample gas blender, cigarette through over-sampling house steward again by its gas collection main pipe
Gas automatic monitored control system extracts flue gas, including flue gas flow meter, scavenging pipeline, intelligence by CEMS probe insertion sample gas blenders
Controller and corresponding control software, wherein, the scavenging pipeline is connected between sample gas blender and multiple spot flue gas sampler
Sampling house steward on, scavenging pipeline and compressed air communication connected from the upper branch road of compressed air one and connected after a magnetic valve I
To sampling house steward, connected from another lower branch road of compressed air and sampling house steward is also connected to after a magnetic valve II, in upper branch road
Sampling house steward between lower branch road is provided with electric control valve and electric gate valve, and electric gate valve is located at compared with electric control valve from sample
The magnetic valve II of gas blender closer proximity, the magnetic valve I of upper branch road and lower branch road is normally closed, between upper branch road and lower branch road
Electric control valve and electric gate valve on sampling house steward are normally opened；The flue gas flow meter is arranged on multiple spot flue gas sampler with blowing
Sweep on the sampling house steward on pipeline between branch road；The intelligent controller respectively with flue gas flow meter, magnetic valve I, magnetic valve II,
Electric control valve, electric gate valve and the connection of flue gas automatic monitored control system.
Compared with prior art, a kind of novel denitration SCR outlets multiple spot flue gas sampling automatic control system of the present utility model,
The system can detect sampling cigarette by being configured with flue gas flow meter, scavenging pipeline and intelligent controller by flue gas flow meter
The flow velocity and flow of gas, are less than nominal flow rate in sample gas velocity, can be judged to the pipeline blockage phenomenon of sampling system, intelligence
Energy controller primer liner purging program, so that the pipeline of sampling system is timely and effectively cleaned by scavenging pipeline,
Therefore the utility model control system is provided with measurement and the control function of flue gas flow, realizes multiple spot flue gas sampling process
Intelligentized control method.
Brief description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the structured flowchart of the embodiment control system of the utility model one.
Fig. 2 is isokinetic sampling's Automatic Control Theory figure of the embodiment control system of the utility model one.
Fig. 3 is the automatic blowing flow chart of the embodiment control system of the utility model one.
In figure, 1, flue gas flow meter, 2, magnetic valve I, 3, electric control valve, 4, electric gate valve, 5, scavenging pipeline, 6, electromagnetism
Valve II, 7, sample gas blender, 8, sampling house steward, 9, denitration SCR exhaust pass, 10, multiple spot flue gas sampler.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that retouched
The embodiment stated is a part of embodiment of the present utility model, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made all belongs to
In protection domain of the present utility model.
Fig. 1, which is shown in the structural representation of one preferred embodiment of the utility model, figure, includes flue gas flow meter
1st, scavenging pipeline 5 and intelligent controller, wherein：The scavenging pipeline 5 is connected to sample gas blender 7 and multiple spot flue gas sampler 10
Between sampling house steward 8 on, scavenging pipeline 5 and compressed air communication connect a magnetic valve I from the upper branch road of compressed air one
Sampling house steward 8 is connected to after 2, is connected from another lower branch road of compressed air and sampling house steward is also connected to after a magnetic valve II 6
8, be provided with electric control valve 3 and electric gate valve 4 on the sampling house steward 8 between upper branch road and lower branch road, electric gate valve 4 be located at compared with
Electric control valve 3 is from the closer proximity of sample gas blender 7, and the magnetic valve II 6 of the magnetic valve I 2 of upper branch road and lower branch road is normally closed,
Electric control valve 3 and electric gate valve 4 between upper branch road and lower branch road on sampling house steward 8 are normally opened；The flue gas flow meter 1 is pacified
On sampling house steward 8 between branch road on multiple spot flue gas sampler 10 and scavenging pipeline 5；The intelligent controller respectively with cigarette
Air-flow gauge 1, magnetic valve I 2, magnetic valve II 6, electric control valve 3, electric gate valve 4 and (the following letter of flue gas automatic monitored control system
Referred to as CMES) connection.
In embodiment, the multiple spot flue gas sampler 10 is arranged in denitration SCR exhaust pass 9, multiple spot flue gas sampling
By its gas collection main pipe, sampled house steward 8 is communicated to sample gas blender 7 to device 10 again, and flue gas automatic monitored control system connects through CEMS
Probe insertion sample gas blender 7 extracts flue gas.
The flue gas flowed out out of boiler contains a certain amount of dust, multiple spot flue gas sampler 10 in use for some time,
It can be remained in pipeline, if cleaning can block sample lines and the accuracy of measurement not in time, in order to realize dust in equipment
Function is blown down, multigroup flue gas sampler is installed in denitration SCR rear pass 9, is connected multigroup sampler and profit with gas collection main pipe
Flue gas is guided into flue gas blender with the pressure of negative pressure flue, is finally discharged into negative pressure flue.Because the utility model controls system
System is configured with flue gas flow meter 1, electric control valve 3 and intelligent controller etc., thus make it have flue gas flow measurement and
Control function, automatically controls the flow velocity of sample gas, accomplishes isokinetic sampling, is less than nominal flow rate in sample gas velocity, can be judged to sampling
The pipeline blockage phenomenon of system, intelligent controller primer liner purging program.
Referring to Fig. 2, intelligent measure and control process：Flue gas flow meter 1 is a kind of can to measure the heat of high-temperature dusty gas
Conduction flowmeter, it is insensitive to particulate matters such as dust, the flow velocity and flow of sampling flue gas can be detected, according to the stream of flue gas sampling
Fast flow, intelligent controller (particularly being handled by the PID regulator of intelligent controller according to deviation of signal) is sent
The aperture of order control electric control valve 3, makes sample gas velocity equal with flue gas flow rate in flue, accomplishing isokinetic sampling, (constant speed is adopted
Sample is a basic principle of environment monitoring), realize the closed-loop control of flue gas sampling.
Referring to Fig. 3, intelligent purge：Sample lines (including sample house steward 8, gas collection main pipe and multi-point sampling device
Various connecting lines) because containing a large amount of dust in flue gas, easily sample lines are blocked, are less than setting value in sample gas velocity,
Even if the standard-sized sheet of electric control valve 3 can not reach setting flow velocity, intelligent controller judges that sample lines have clogging, sends
The purging order of cleaning channels, is first shut off the electric control valve 3 before flue gas blender and the (work of electric gate valve 4 of electric gate valve 4
With being to ensure that purging compressed air will not be into flue gas blender, the safety of blender CMES probes is inserted in protection), open and purge
Magnetic valve I 2, is purged using compressed air to the pipeline before blender, after delay a period of time, system reset；
When needing to carry out the pipeline after flue gas blender and blender cleaning purging, control system is closed electronic
Gate valve 4 and electric control valve 3, are opened magnetic valve II 6, flue gas blender and later pipeline are blown using compressed air
Sweep, system reset after delay a period of time.
When system enters purging program, the instruction of one " purging starts " is first sent to CEMS, CEMS can keep current
Measurement data, after purging terminates, send " purging terminates " instruction to CEMS, CEMS automatically restores to measuring state, intelligence
Controller can also receive CMES purging order, perform purging task.
Generally, the separation valve door of the end of flue gas blender is controlled in embodiment can coordinate the flow of adjustment sample gas, with
SCR rear pass flue gas flow rate is reference, accomplishes isokinetic sampling；The end pipeline of flue gas blender leads to the bigger negative pressure cigarette of negative pressure
Road, attracts sampling flue gas to produce flowing, flows to flue gas blender by flue negative pressure.All set before and after the flue gas blender
During valve, the valve (electric gate valve 4 above and separation valve door below) before and after closing is easy to analysis meter (for example
CEMS maintenance).
Preferably, can set the multiple spot flue gas sampler 10 includes adopting that several are installed along along flue width
Sample device monomer, the thief hatch of each sampler monomer is equidistant be communicated to a gas collection main pipe after be communicated to through over-sampling house steward 8
Sample gas blender 7.Because the distance of each sample tap to sample gas blender 7 is equal, the resistance of ducting is identical, is cut in line with waiting
Face, the principle of uniform flow, so as to ensure that the flue gas flow that each sample point is extracted is basically identical, have been truly realized sampling equal
It is even, ensure the accuracy and reliability of denitration flue gas inspection.
The above, is only preferred embodiment of the present utility model, and any formal limit is not done to the utility model
System, every according to technical spirit of the present utility model, any simple modification and equal change, fall to made by above example
Enter within protection domain of the present utility model.
Claims (3)
1. a kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system, installed in denitration SCR exhaust pass (9)
There is multiple spot flue gas sampler (10), multiple spot flue gas sampler (10) is communicated to through over-sampling house steward (8) again by its gas collection main pipe
Sample gas blender (7), flue gas automatic monitored control system extracts flue gas by CEMS probe insertion sample gas blenders (7), it is characterized in that：
Including flue gas flow meter (1), scavenging pipeline (5) and intelligent controller, wherein：The flue gas flow meter (1) is arranged on and lit a cigarette more
On sampling house steward (8) on gas sampling (10) and scavenging pipeline (5) between branch road；The scavenging pipeline (5) is connected to sample gas
On sampling house steward (8) between blender (7) and multiple spot flue gas sampler (10), scavenging pipeline (5) and compressed air communication, from
The upper branch road of compressed air one, which is connected, is connected to sampling house steward (8) after a magnetic valve I (2), from another of compressed air under prop up
Road, which is connected, is also connected to sampling house steward (8), the sampling house steward (8) between upper branch road and lower branch road after a magnetic valve II (6)
Electric control valve (3) and electric gate valve (4) are provided with, electric gate valve (4) is located at compared with electric control valve (3) from sample gas blender
(7) magnetic valve II (6) of closer proximity, the magnetic valve I (2) of upper branch road and lower branch road is normally closed, upper branch road and lower branch road it
Between electric gate valve (4) in sampling house steward (8) be normally opened, electric control valve (3) is opened with the control signal of intelligent controller
Degree regulation；The intelligent controller respectively with flue gas flow meter (1), magnetic valve I (2), magnetic valve II (6), electric control valve
(3), electric gate valve (4) and the connection of flue gas automatic monitored control system.
2. a kind of novel denitration SCR outlets multiple spot flue gas sampling automatic control system according to claim 1, its feature
It is：One negative pressure flue of end pipeline communication of the sample gas blender (7), in sample gas blender (7) between negative pressure flue
Separation valve door is installed.
3. a kind of novel denitration SCR outlets multiple spot flue gas sampling automatic control system according to claim 1 or 2, it is special
Levying is：The multiple spot flue gas sampler (10) includes the sampler monomer that several are installed along along flue width, and each is adopted
Equidistant be communicated to after a gas collection main pipe of the thief hatch of sample device monomer is communicated to sample gas blender (7) through over-sampling house steward (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621241961.2U CN206325405U (en) | 2016-11-14 | 2016-11-14 | A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621241961.2U CN206325405U (en) | 2016-11-14 | 2016-11-14 | A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system |
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| Publication Number | Publication Date |
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| CN206325405U true CN206325405U (en) | 2017-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621241961.2U Expired - Fee Related CN206325405U (en) | 2016-11-14 | 2016-11-14 | A kind of novel denitration SCR exports multiple spot flue gas sampling automatic control system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107462448A (en) * | 2017-08-11 | 2017-12-12 | 南京新瓦特智控科技有限公司 | A kind of multiple spot areal sampling system and method for the monitoring of multiphase flow medium composition |
| CN107677518A (en) * | 2017-08-11 | 2018-02-09 | 南京新瓦特智控科技有限公司 | A kind of total cross-section multidraw system and method for the monitoring of multiphase flow medium composition |
| CN108593357A (en) * | 2018-04-27 | 2018-09-28 | 中国华电科工集团有限公司 | A kind of multiple spot gas sampling device and sampling method |
| CN108801964A (en) * | 2018-09-20 | 2018-11-13 | 刘建松 | It is a kind of directly to measure formula gaseous pollutant emission monitoring device |
| CN109989806A (en) * | 2019-03-04 | 2019-07-09 | 中国船舶重工集团公司第七一一研究所 | Diesel engine high-pressure SCR ventilation voltage-stabilizing system |
| CN111324153A (en) * | 2020-02-28 | 2020-06-23 | 老肯医疗科技股份有限公司 | Flow monitoring device and flow monitoring method |
| CN113375987A (en) * | 2019-12-04 | 2021-09-10 | 华能罗源发电有限责任公司 | Self-suction CEMS multi-point flue gas sampling device and control method |
| CN113465996A (en) * | 2021-06-29 | 2021-10-01 | 华能国际电力股份有限公司上安电厂 | Automatic purging control system based on denitration grid sampling device |
| CN113484103A (en) * | 2021-07-16 | 2021-10-08 | 南京龙源环保有限公司 | Flue gas collecting device for SCR concentration field measurement |
| CN113670678A (en) * | 2021-09-06 | 2021-11-19 | 山东省计量科学研究院 | Constant-speed tracking sampling method for smoke detection |
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- 2016-11-14 CN CN201621241961.2U patent/CN206325405U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107677518A (en) * | 2017-08-11 | 2018-02-09 | 南京新瓦特智控科技有限公司 | A kind of total cross-section multidraw system and method for the monitoring of multiphase flow medium composition |
| CN107462448A (en) * | 2017-08-11 | 2017-12-12 | 南京新瓦特智控科技有限公司 | A kind of multiple spot areal sampling system and method for the monitoring of multiphase flow medium composition |
| CN108593357B (en) * | 2018-04-27 | 2020-06-26 | 中国华电科工集团有限公司 | Multipoint gas sampling device and sampling method |
| CN108593357A (en) * | 2018-04-27 | 2018-09-28 | 中国华电科工集团有限公司 | A kind of multiple spot gas sampling device and sampling method |
| CN108801964A (en) * | 2018-09-20 | 2018-11-13 | 刘建松 | It is a kind of directly to measure formula gaseous pollutant emission monitoring device |
| CN109989806A (en) * | 2019-03-04 | 2019-07-09 | 中国船舶重工集团公司第七一一研究所 | Diesel engine high-pressure SCR ventilation voltage-stabilizing system |
| US11415035B2 (en) | 2019-03-04 | 2022-08-16 | Shanghai marine diesel engine research institute | Diesel engine high pressure SCR ventilation and pressure stabilization system |
| CN113375987A (en) * | 2019-12-04 | 2021-09-10 | 华能罗源发电有限责任公司 | Self-suction CEMS multi-point flue gas sampling device and control method |
| CN111324153A (en) * | 2020-02-28 | 2020-06-23 | 老肯医疗科技股份有限公司 | Flow monitoring device and flow monitoring method |
| CN111324153B (en) * | 2020-02-28 | 2023-05-26 | 老肯医疗科技股份有限公司 | Flow monitoring device and flow monitoring method |
| CN113465996A (en) * | 2021-06-29 | 2021-10-01 | 华能国际电力股份有限公司上安电厂 | Automatic purging control system based on denitration grid sampling device |
| CN113484103A (en) * | 2021-07-16 | 2021-10-08 | 南京龙源环保有限公司 | Flue gas collecting device for SCR concentration field measurement |
| CN113670678A (en) * | 2021-09-06 | 2021-11-19 | 山东省计量科学研究院 | Constant-speed tracking sampling method for smoke detection |
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