CN208155674U - A kind of SCR reaction chamber NOXThe online data-logger of concentration - Google Patents
A kind of SCR reaction chamber NOXThe online data-logger of concentration Download PDFInfo
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- CN208155674U CN208155674U CN201820509752.4U CN201820509752U CN208155674U CN 208155674 U CN208155674 U CN 208155674U CN 201820509752 U CN201820509752 U CN 201820509752U CN 208155674 U CN208155674 U CN 208155674U
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- flue gas
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Abstract
The utility model discloses a kind of SCR reaction chamber NOxThe online data-logger of concentration, including sampling module, touring control module, flue gas analysis module, sampling module includes multiple groups sampling gun, sampling cabinet, multi-pipeline and suction pump, the corresponding spray ammonia subregion of every group of sampling gun protrudes into SCR reaction chamber and is distributed the sampling gun of more different lengths along flue depth direction by gridding method, touring control module includes logic control cabinet, detection solenoid valve, emptying solenoid valve, and flue gas analysis module includes flue gas pretreatment unit and flue gas analyzer.The utility model is as unit of spraying ammonia subregion, circling measurment is carried out by " previous measurement; the latter prepares ", greatly shorten the circling measurment period, each spray ammonia subregion has multiple and different depth sample points simultaneously, each sample point is sampled by corresponding sampling gun, and the sampling flue gas of a spray more sampling guns of ammonia subregion is average after being mixed to be detected again, can improve the representativeness of testing result.
Description
Technical field
The utility model relates to thermal power plant's denitration technology field, in particular to a kind of SCR reaction chamber NOx concentration is touring online
Detection device.
Background technique
Flue gas NOx concentration is that Environment Protect in China portion requires the important indicator monitored to coal steam-electric plant smoke, GB13223-
2011《Fossil-fuel power plant atmospheric pollutant emission standard》More stringent want is proposed to NOx concentration in the flue gas of power plant emission
It asks.Current most of thermal power plants are taken off using selective reduction method (Selective Catalytic Reduction, SCR)
The ammonia spraying amount of nitre, SCR denitration system has an important influence denitration efficiency.Ammonia spraying amount is very few, and denitration efficiency is low to be caused to discharge cigarette
The NOx concentration of gas is excessively high, may be more than limited value of discharge standard.Ammonia spraying amount is excessive, and extra ammonia can be with the SO in flue gas3、
Water generates the very big ammonium hydrogen sulfate of viscosity, causes air preheater flue blockage.It is therefore desirable to which it is dense accurately to detect NOx in flue gas
Degree adjusts ammonia spraying amount for SCR denitration system and provides reasonable foundation.Currently, thermal power plant SCR, which reacts indoor spray ammonia pipe, presses subregion
The ammonia spraying amount of arrangement, each subregion is adjusted by the single regulating valve of corresponding subregion.In existing SCR reaction chamber flue gas NOx
In the online data logger system of concentration, boiler smoke ingredient data logger system and control that patent CN201510811337.5 is announced
Method processed, detection method are circulated for the flue gas that all sample points are persistently extracted in suction pump, detect which sampling
The flue gas is just led to flue gas analyzer by the flue gas of point, and not only suction pump energy consumption is big for this detection method, but also individually to take
Sampling point is that unit carries out circling measurment, and the circling measurment period is long, and testing result can not embody spray ammonia subregion NOx concentration average water
It is flat.Patent CN201710038770.9 announces a kind of SCR exhaust pass cross section nitrogen oxides and oxygen concentration online test method
And system, detection method are that the smoke sampling of a smoke sampling point tests and analyzes, the flue gas of another smoke sampling measuring point
It is to be detected to extract discharge etc., the sampling gun of this detection system does not carry out specific aim arrangement according to spray ammonia subregion, and with list
A sample point is detected, and equally exists that detection cycle is long, and testing result does not have representative disadvantage.
Utility model patent CN201320254786.0 discloses a kind of SCR flue gas denitrification system smoke distribution measurement dress
It sets, mainly includes multiple probe tubes, the first valve group case, the second valve group case, suction pump, switching clack box, flue gas analyzer, control
Unit processed.Flue gas analyzer, switching clack box, the first valve group case and the second valve group case are controlled by control unit, is taken out every time
The flue gas of two sample points of SCR denitration system is taken, the flue gas of one of sample point enters flue gas analyzer analysis, another takes
The flue gas by-passing of sampling point, after the completion of entering the flue gas analysis of flue gas analyzer, the flue gas of by-passing enters back into flue gas analysis
Instrument analysis.The technical solution is a kind of portable SCR flue gas denitrification system smoke distribution field survey device, and the purpose is to mention
High working efficiency and measurement accuracy control switching clack box, the first valve group case and the second valve group case by control unit, more
Flue gas in branch probe tube sequentially enters flue gas analyzer analysis, saves time and manpower object that artificial plug probe tube expends
Power improves work efficiency, through the flue gas of a probe tube when flue gas analyzer is analyzed, at the flue gas of another probe tube
In the detection mode of state to be measured, measurement accuracy is improved.But the technical solution does not pass through one according to a spray ammonia subregion
A regulating valve is to adjust the actual conditions of ammonia spraying amount to correspond to and spray ammonia subregion arrangement probe tube, and analysis one samples every time
The single-point flue gas that pipe extracts, detection cycle is long, and testing result cannot represent the average level of a spray ammonia subregion flue gas concentration, nothing
Method provides reasonable foundation for optimization ammonia spraying amount.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the prior arts and deficiency are patrolled to solve prior art NOx concentration
It is long to return detection cycle, testing result can not reflect spray ammonia subregion NOx concentration average level, it is difficult to adjust spray for SCR denitration system
Ammonia amount provides the problem of reasonable foundation, provides a kind of online data-logger of SCR reaction chamber NOx concentration.
The purpose of this utility model is realized by the following technical solution：
A kind of online data-logger of SCR reaction chamber NOx concentration, including：Sampling module, touring control module and flue gas
Analysis module；Sampling module includes one group of sampling gun, sampling cabinet, flue gas fairlead, tee tube, detection connecting tube, emptying connection
Pipe；Touring control module includes detection solenoid valve, emptying solenoid valve；Flue gas analysis module includes flue gas pretreatment unit and flue gas
Analyzer；
SCR reaction chamber is protruded into sampling gun one end, and the sampling gun other end, sampling cabinet, flue gas fairlead, threeway tube inlet are successively
Connection；Tee tube outlet connects detection connecting tube and emptying connecting tube respectively；Detection solenoid valve is mounted in detection connecting tube, emptying
Solenoid valve is mounted in emptying connecting tube；
One corresponding sampling module of spray ammonia subregion and touring control module；Multiple detection connecting tubes access an inspection together
Main pipe is surveyed, the outlet of detection main pipe is connected to flue gas pretreatment unit and flue gas analyzer；Multiple emptying connecting tubes access one together
Main pipe is emptied, atmosphere is led in the outlet of emptying main pipe；
Multiple groups sampling gun is arranged in different spray ammonia subregions, extracts the flue gas of two spray ammonia subregions, one of subregion every time
Flue gas enter flue gas analyzer analysis, another subregion flue gas emptying so that flow of flue gas in pipeline is got up for subsequent time
Detection is prepared.
Preferably, each sampling cabinet connects one group of sampling gun, and one end of sampling gun is protruded into SCR reaction chamber flue, installs
On the sampling hole of SCR reaction chamber walling of flue, every group of sampling gun is distributed more length differences along flue depth direction by gridding method
Sampling gun.
Preferably, the sampling flue gas of corresponding spray more sampling guns of ammonia subregion is uniformly mixed inside sampling cabinet.
Preferably, device further includes two suction pumps that can adjust the flue gas flow of extraction, and it is female to be separately mounted to detection
On pipe and emptying main pipe.
Preferably, logic control cabinet connecting detection solenoid valve and emptying solenoid valve, logic control cabinet control detection solenoid valve
With the switching sequence of emptying solenoid valve.
Preferably, flue gas pretreatment unit is used to pre-process the flue gas for entering flue gas analyzer, including dehumidifies, removes
Dirt.
Preferably, flue gas analyzer is used to analyze detection flue gas, and analysis result is transmitted by signal cable
To DCS.
The utility model compared with prior art, has the following advantages that and beneficial effect：
1, the utility model carries out circling measurment by " previous measurement, the latter prepare ", greatly as unit of spraying ammonia subregion
It is big to shorten the circling measurment period, so that it is dense so that total ammonia spraying amount of the out of stock system of SCR is preferably corresponded to flue gas NOx in SCR reaction chamber
Actual conditions are spent, denitration efficiency is improved and reduce the escaping of ammonia.
2, sampling gun group corresponds to spray ammonia subregion arrangement, and every group of sampling gun is distributed more length differences along flue depth direction
Sampling gun, NOx grid survey in SCR reaction chamber may be implemented.
3, each spray ammonia subregion has multiple and different depth sample points simultaneously, and each sample point is sampled by corresponding sampling gun,
The sampling flue gas of one spray more sampling gun of ammonia subregion is average after being mixed to be detected again, can improve the representative of testing result
Property.For flue gas by entering back into flue gas analyzer after mixing, the testing result obtained from flue gas analyzer is corresponding spray ammonia point
The average value in area more meets the actual conditions for adjusting valve regulation one spray ammonia subregion ammonia spraying amount.
4, it detects every time while extracting two-way flue gas, wherein enter flue gas analyzer all the way for sense partitions flue gas, it is another
Road is that subregion flue gas to be measured is arranged to atmosphere.Extract in advance subregion flue gas to be measured make its elder generation in pipeline constant flow for a period of time,
Make the flue gas for entering flue gas analyzer when detection closer to the real-time status of corresponding spray ammonia subregion flue gas in this way, reduces detection and miss
Difference.
Detailed description of the invention
Fig. 1 is embodiment device structural schematic diagram.
In Fig. 1：100- sampling gun；110- sampling cabinet；120- flue gas fairlead；130- detects connecting tube；140- emptying connects
Adapter tube；150- detects main pipe；160- empties main pipe；170-1/170-2- suction pump；180- flue gas pretreatment unit；190- flue gas
Analyzer；200- tee tube；210- logic control cabinet；1A/2A/3A/4A/5A/6A- detects solenoid valve；1B/2B/3B/4B/5B/
6B- emptying solenoid valve.
Specific embodiment
The present invention will be further described in detail with reference to the embodiments and the accompanying drawings, but the implementation of the utility model
Mode is without being limited thereto.
Embodiment 1
A kind of online data-logger of SCR reaction chamber NOx concentration, as shown in Figure 1：
1. the corresponding spray ammonia subregion of sampling gun 100 is mounted on the sampling hole of SCR reaction chamber walling of flue, one end and sampling cabinet
110 connections, the other end protrude into flue；It is dispersed with the more different sampling guns of length along flue depth direction, may be implemented
NOx concentration grid survey in SCR reaction chamber.
2. sampling cabinet 110 connects smoke sampling rifle for uniformly mixing the sampling flue gas of a spray ammonia subregion, one end, separately
One end connects flue gas fairlead 120.
3. flue gas fairlead 120 connects sampling cabinet 110 and tee tube 200, for flue gas to be led to tee tube from sampling cabinet.
4. 200 entrance of tee tube connects flue gas fairlead 120, outlet connects detection connecting tube 130 and emptying connecting tube respectively
140, for flue gas to be guided to flue gas analyzer 190 or atmosphere.
5. 130 connecting detection main pipe 150 of connecting tube and tee tube 200 are detected, for flue gas to be drained into inspection from tee tube
Survey main pipe.Detection solenoid valve is installed in detection connecting tube 130, for controlling the extraction of detection flue gas.
6. detecting 150 entrance connecting detection connecting tube 130 of main pipe, outlet connection flue gas analyzer 190.Detect main pipe 150
On be sequentially installed with suction pump 170-1 and flue gas pretreatment unit 180.Wherein, suction pump 170 is for controlling extracted detection
Flue gas flow, flue gas pretreatment unit 180 is used to dehumidify to the flue gas for entering flue gas analyzer, the pretreatment such as dedusting.
7. 190 arrival end connecting detection main pipe 150 of flue gas analyzer, atmosphere is led in outlet, for carrying out to sampling flue gas
Analysis, and analysis data are transmitted to DCS by signal cable.
8. emptying connecting tube 140 connects tee tube 200 and emptying main pipe 160, led to for flue gas will to be sampled from tee tube
Empty main pipe.Emptying solenoid valve is installed in emptying connecting tube 140, for controlling the extraction of flue gas to be measured.
9. it is mounted on the suction pump 170-2 in emptying main pipe 160, for controlling the flow of the flue gas to be measured extracted,
Atmosphere is led in outlet.
10. 210 connecting detection solenoid valve of logic control cabinet and emptying solenoid valve, for controlling detection solenoid valve and emptying electricity
The switching sequence of magnet valve.
A kind of online data-logger control method of SCR reaction chamber NOx concentration, is carried out touring as unit of spraying ammonia subregion
Detection, initial detecting subregion and circling measurment sequence can be selected arbitrarily, and one such detection mode specifically includes following step
Suddenly：
1) under the control of logic control cabinet 210, detection solenoid valve 1A is opened, emptying solenoid valve 2B is opened, remaining solenoid valve
It remains off.The flue gas extracted from spray ammonia subregion 1 is detection flue gas, and spray more different length sampling guns of ammonia subregion extract
Enter sampling cabinet 110 after flue gas to be uniformly mixed, then in turn through flue gas fairlead 120, tee tube 200, detection connecting tube
130, it after detecting main pipe 150 and suction pump, is dehumidified into flue gas pretreatment unit 180, the pretreatment such as dedusting, is finally passed through
The flue gas of processing enters flue gas analyzer analysis 190.The flue gas extracted from spray ammonia subregion 2 is flue gas to be measured, sprays ammonia subregion more
The flue gas that the sampling gun of different length extracts sampling cabinet after mixing, successively connect by flue gas fairlead, tee tube, emptying
Adapter tube, emptying main pipe and suction pump, are directly arranged to atmosphere.
2) after the detection for completing spray ammonia subregion 1, under the control of logic control cabinet, detection solenoid valve 1A is closed, detection electricity
Magnet valve 2A is opened, and emptying solenoid valve 2B is closed, and emptying solenoid valve 3B is opened, remaining solenoid valve remains off.From spray ammonia point
The flue gas that area 2 extracts is detection flue gas, is analyzed into the flue gas analyzer, and the flue gas extracted from spray ammonia subregion 3 is cigarette to be measured
Gas is directly communicated to atmosphere.
3) after the detection for completing spray ammonia subregion 2, under the control of logic control cabinet, detection solenoid valve 2A is closed, detection electricity
Magnet valve 3A is opened, and emptying solenoid valve 3B is closed, and emptying solenoid valve 4B is opened, remaining solenoid valve remains off.From spray ammonia point
The flue gas that area 3 extracts is detection flue gas, is analyzed into flue gas analyzer, and the flue gas extracted from spray ammonia subregion 4 is flue gas to be measured, directly
It connects to atmosphere.
4) after the detection for completing spray ammonia subregion 3, under the control of logic control cabinet, detection solenoid valve 3A is closed, detection electricity
Magnetic 4A is opened, and emptying solenoid valve 4B is closed, and emptying solenoid valve 5B is opened, remaining solenoid valve remains off.From spray ammonia subregion 4
The flue gas of extraction is detection flue gas, is analyzed into flue gas analyzer, and the flue gas extracted from spray ammonia subregion 5 is flue gas to be measured, directly
Lead to atmosphere.
5) after the detection for completing spray ammonia subregion 4, under the control of logic control cabinet, detection solenoid valve 4A is closed, detection electricity
Magnet valve 5A is opened, and emptying solenoid valve 5B is closed, and emptying solenoid valve 6B is opened, remaining solenoid valve remains off.From spray ammonia point
The flue gas that area 5 extracts is detection flue gas, is analyzed into flue gas analyzer, and the flue gas extracted from spray ammonia subregion 6 is flue gas to be measured, directly
It connects to atmosphere.
6) after the detection for completing spray ammonia subregion 5, under the control of logic control cabinet, detection solenoid valve 5A is closed, detection electricity
Magnet valve 6A is opened, and emptying solenoid valve 6B is closed, and emptying solenoid valve 1B is opened, remaining solenoid valve remains off.From spray ammonia point
It is detection flue gas that area 6, which is evacuated the flue gas taken, is analyzed into flue gas analyzer, and the flue gas being evacuated from spray ammonia subregion 1 is flue gas to be measured,
It is directly communicated to atmosphere.In this way, completing a cycle circling measurment, and start the circling measurment of next cycle.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiments of the present invention is not by above-mentioned
The limitation of embodiment, it is made under other any spiritual essence and principles without departing from the utility model to change, modify, replacing
In generation, simplifies combination, should be equivalent substitute mode, is included within the protection scope of the utility model.
Claims (7)
1. a kind of online data-logger of SCR reaction chamber NOx concentration, which is characterized in that including：Sampling module, touring control
Module and flue gas analysis module；Sampling module includes one group of sampling gun, sampling cabinet, flue gas fairlead, tee tube, detection connection
Pipe, emptying connecting tube；Touring control module includes detection solenoid valve, emptying solenoid valve；Flue gas analysis module includes that flue gas is located in advance
Manage unit and flue gas analyzer；
Each sampling cabinet connects one group of sampling gun, and SCR reaction chamber, the sampling gun other end, sampling cabinet, flue gas are protruded into sampling gun one end
Fairlead, threeway tube inlet are sequentially connected；Tee tube outlet connects detection connecting tube and emptying connecting tube respectively；Detect solenoid valve peace
In detection connecting tube, emptying solenoid valve is mounted in emptying connecting tube；
One corresponding sampling module of spray ammonia subregion and touring control module；Multiple detection connecting tubes access detection mother together
Pipe, the outlet of detection main pipe are connected to flue gas pretreatment unit and flue gas analyzer；Multiple emptying connecting tubes access an emptying together
Atmosphere is led in main pipe, the outlet of emptying main pipe；
Multiple groups sampling gun is arranged in different spray ammonia subregions, extracts the flue gas of two spray ammonia subregions, the cigarette of one of subregion every time
Gas enters flue gas analyzer analysis, and the flue gas emptying of another subregion makes flow of flue gas in pipeline get up for the detection of subsequent time
It prepares.
2. the online data-logger of SCR reaction chamber NOx concentration according to claim 1, which is characterized in that sampling gun
One end is protruded into SCR reaction chamber flue, is mounted on the sampling hole of SCR reaction chamber walling of flue, and every group of sampling gun presses gridding method edge
Flue depth direction is distributed the more different sampling guns of length.
3. the online data-logger of SCR reaction chamber NOx concentration according to claim 1, which is characterized in that corresponding spray ammonia
The sampling flue gas of more sampling guns of subregion is uniformly mixed inside sampling cabinet.
4. the online data-logger of SCR reaction chamber NOx concentration according to claim 1, which is characterized in that device also wraps
The suction pump of flue gas flow of extraction can be adjusted by including two, be separately mounted to detection main pipe and emptied in main pipe.
5. the online data-logger of SCR reaction chamber NOx concentration according to claim 1, which is characterized in that logic control
Cabinet connecting detection solenoid valve and emptying solenoid valve, the switching sequence of logic control cabinet control detection solenoid valve and emptying solenoid valve.
6. the online data-logger of SCR reaction chamber NOx concentration according to claim 1, which is characterized in that flue gas is located in advance
Reason unit is used to pre-process the flue gas for entering flue gas analyzer, including dehumidifying, dedusting.
7. the online data-logger of SCR reaction chamber NOx concentration according to claim 1, which is characterized in that flue gas analysis
Instrument is used to analyze detection flue gas, and analysis result is transmitted to DCS by signal cable.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344604A (en) * | 2018-04-11 | 2018-07-31 | 华南理工大学 | A kind of SCR reative cells NOXThe online data-logger of concentration and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344604A (en) * | 2018-04-11 | 2018-07-31 | 华南理工大学 | A kind of SCR reative cells NOXThe online data-logger of concentration and control method |
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