CN208206597U - A kind of device of quick detection nitrogen oxides in effluent concentration and its spatial distribution - Google Patents
A kind of device of quick detection nitrogen oxides in effluent concentration and its spatial distribution Download PDFInfo
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- CN208206597U CN208206597U CN201820856204.9U CN201820856204U CN208206597U CN 208206597 U CN208206597 U CN 208206597U CN 201820856204 U CN201820856204 U CN 201820856204U CN 208206597 U CN208206597 U CN 208206597U
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Abstract
The utility model discloses the devices of a kind of quickly detection nitrogen oxides in effluent concentration and its spatial distribution, belong to gas sample field of measuring technique, it includes benchmark sample lines and multiple spot spatial sampling pipeline, express passway is respectively provided in benchmark sample lines and multiple spot spatial sampling pipeline, the front end of express passway connects more sampling branch pipes in multiple spot spatial sampling pipeline, samples and switch valve is arranged on branch pipe.The device is due to being provided with express passway, it samples and detects from express passway again after flue gas being delivered between detection device with the express passway of big flow, the length of sampling pipe is shortened, substantially reduce detection lag time, when needing to monitor spatial distribution on this basis, then replace sample presentation with benchmark sample lines by multiple spot spatial sampling pipeline, by the sample point for switching Vavle switching multiple spot spatial sampling pipeline, the wheel for completing spatial points is surveyed, the sample presentation of benchmark sample lines is maintained simultaneously, maintains the continual and steady control of spray ammonia total amount.
Description
Technical field
The utility model belongs to gas sample detection technique field, and in particular to a kind of quickly detection nitrogen oxides in effluent
The device of concentration and its spatial distribution.
Background technique
With the raising of environmental consciousness, denitrating system has become the indispensable system of various Industrial Boilers.Current denitration system
Selective catalytic reduction (SCR) technology is widely used in system, and principle is with NH3For reducing agent, by the NO in flue gasXSelective catalysis is also
It originally was harmless N2And H2O realizes the purpose of denitration.During denitration, if applying NH3Amount it is less, then cannot be thorough
NO in catalytic reducing smokeX, so that denitration efficiency is low, flue gas emission is not up to standard；If applying NH3Amount it is more, then again meeting
Cause NH3It is excessive, on the one hand increase cost, on the other hand again results in air pollution, and excessive NH3In easy and flue gas
SO3Reaction generates the ammonium salts such as ammonium hydrogen sulfate, and ammonium salt generates deposition easily blocking and corrosion catalyst and equipment, further decreases de-
Nitre rate.As it can be seen that the spray ammonia controlled level in denitrating system is related to the multi-party benefit such as economy, environmental protection and production safety of system.
Generally sampling pipe is arranged on the flue of Benitration reactor outlet port in existing denitrating system, will by sampling pipe
Sample gas sends in detection instrument cabinet and is detected, the adjusting foundation as ammonia spraying amount.Due to the effecting reaction of Benitration reactor
Temperature, in order to maintain the higher temperature of flue gas, carries out denitration before general dedusting, therefore contains in sample gas between 320 DEG C~400 DEG C
There is volume of smoke.It needs to be arranged on sampling pipe after filter core does dedusting and dehydration and gives accurate nitrous oxides concentration inspection again
Instrument is surveyed, to maintain its higher detection accuracy and service life.
The denitration detection system of such structure, the air quantity of sampling is bigger, and filter core is easier to be blocked by flue dust, needs frequently clear
Reason, and sample presentation is interrupted within the convalescence after cleaning and cleaning.And amount required for sample gas is smaller, it can be by reducing sample
The flow of gas reduces the frequency of filter core cleaning, but in this way sample presentation detection time is more lagged, lag time is generally at 5 points
More than clock, and the ingredient of flue gas changes with the fast changing combustion case of boiler, so that the adjusting rhythm of total ammonia spraying amount can not be with
The paces of upper smoke components variation.
In reality, since flue is more broad, Benitration reactor section is larger, therefore uses multiple spot spray ammonia, and above-mentioned survey
Amount mode is the measurement to flue certain point nitrous oxides concentration, can not reflect point of the nitrous oxides concentration in flue cross section
Cloth situation also just cannot achieve the adjusting of each point ammonia spraying amount.So that current denitration process occurs discharged nitrous oxides sometimes and surpasses
Mark, the escaping of ammonia is serious sometimes, and control effect is bad.
Summary of the invention
The technical problem to be solved by the utility model is to provide a kind of quickly detection nitrogen oxides in effluent concentration and its
The device of spatial distribution can quickly detect the nitrous oxides concentration in flue gas, and monitor the space distribution situation of nitrogen oxides.
In order to solve the above technical problems, the technical solution of the utility model is: designing one kind and quickly detect nitrogen oxygen in flue gas
The device of compound concentration and its spatial distribution, including sample presentation pipe, it is characterised in that: parallel connection has benchmark to adopt on the sample presentation pipe
Express passway, multiple spot are respectively provided in sample pipeline and multiple spot spatial sampling pipeline, benchmark sample lines and multiple spot spatial sampling pipeline
Express passway front end in spatial sampling pipeline connects more sampling branch pipes, samples and installs first switch valve on branch pipe；
Sampling pipe is connected in express passway, the caliber of sampling pipe is less than the caliber of express passway, flue gas is arranged on sampling pipe
The sampling pipe of filter, smoke filter rear end is connected to sample presentation pipe by triple valve, and the air inlet of triple valve is connected to smoke filtration
The gas outlet of device, gas outlet connection sample presentation pipe, another gas outlet are connected to discharge-channel, and sample presentation pipe is nitrous oxides concentration detection
Instrument provides sample gas.
Preferably, whirlwind dust separator is set in the express passway, and whirlwind dust separator is arranged in sampling pipe
In low dirt outlet.
Preferably, smoke sampling pump is also set up on the sampling pipe, smoke sampling pump is located at the front end of triple valve.
Preferably, the smoke sampling pump is between smoke filter and triple valve, smoke sampling pump and smoke filtration
Third switch valve is added on sampling pipe between device, smoke filter is connected to compressed gas source by the 4th switch valve.
Preferably, the compressed gas source is connected to the bottom wall and side wall of smoke filter by the 4th switch valve.
Preferably, the back segment of express passway is connected to collecting pipe, installation smoke evacuation pump on collecting pipe.
Preferably, second switch valve is set in the express passway of the sampling pipe rear end, is quickly led in benchmark sample lines
The front end in road is installed by first switch valve.
Compared with prior art, the utility model has the beneficial effects that
1, due to being provided with express passway, after flue gas being delivered between detection device with the express passway of big flow again from
It samples and detects in express passway, shortened the length of sampling pipe, substantially reduce detection lag time, need on this basis
When monitoring spatial distribution, then replace sample presentation with benchmark sample lines by multiple spot spatial sampling pipeline, by switching Vavle switching multiple spot
The sample point of spatial sampling pipeline, the wheel for completing spatial points is surveyed, while maintaining the sample presentation of benchmark sample lines, maintains spray
The continual and steady control of ammonia total amount.
2, when without monitoring nitrogen oxides spatial distribution, benchmark sample lines and multiple spot spatial sampling pipeline can be mutual
For backup, only the switch valve of each sample lines need to all be opened, no longer it is switched over, it in this way can be in sample presentation
Meanwhile carrying out the cleaning work of another pipeline.
3, it due to being also provided with whirlwind dust separator in express passway, can be produced by air quantity higher in express passway
Raw biggish centrifugal force gets rid of flue dust to peripheral wall, seldom from the centre of whirlwind dust separator outlet side extraction flue dust
Flue gas extends the effective storage life of smoke filter, reduces it and clears up the frequency, so as to increase other gas transmission processing equipments
Clearance time, be conducive to enhancing cleaning effect.
4, since express passway back segment is connected to collecting pipe, on the one hand the only installation smoke evacuation pump on collecting pipe simplifies and is
System structure, extra flue gas pass through collecting pipe and concentrate return flue；On the other hand only installation smoke evacuation pumps on collecting pipe
Increase the flow of flue gas in express passway, more shorten the currency of sample gas, also reduces the installation number of smoke evacuation pump.
5, since second switch valve being arranged in the express passway of sampling pipe rear end, first switch valve can be cooperated, realized fast
The segmented blowback in fast channel is cleared up, and the pressure of blowback air-flow can be enhanced, and keeps cleaning more thorough.
6, due to being respectively provided with insulating layer in express passway and sampling pipe, convenient for maintaining the condition of high temperature of flue gas, flue gas is avoided
In ingredient there is dew point phenomenon, provided safeguard to be convenient to clean smoke filter.
7, due to also setting up smoke sampling pump on sampling pipe, smoke sampling is pumped between smoke filter and triple valve,
On the one hand the conveying speed of sample gas can be increased, the currency is reduced；On the other hand as far as possible by standby survey state when invalid cigarette
Gas discharge thoroughly, while shortening the system recovery time of pipeline, to provide effective sample gas in time for sample presentation pipe.
8, the bottom wall and side wall of smoke filter are connected to by the 4th switch valve due to compressed gas source, so that smoke filter
When carrying out blowback cleaning, blowback can be carried out from bottom and side wall direction, so that cleaning is more thorough.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is distribution schematic diagram of each test point in flue cross section.
Marked in the figure: 1, flue；2, first switch valve；3, express passway；4, whirlwind dust separator；5, collecting pipe；6,
Second switch valve；7, smoke filter；8, third switch valve；9, sampling pump；10, triple valve；11, the 4th switch valve；12, it compresses
Gas source；13, fume-dehydrating device；14, nitrogen oxides detector；15, branch pipe is sampled；16, outlet channel 17, smoke evacuation pump.
Specific embodiment
The utility model is described in further detail with specific embodiment with reference to the accompanying drawing.
The upstream end of flue gas from circulating direction front to back, is defined as front end, correspondingly referring to flue gas by the utility model
The outflow end of flue gas is defined as rear end.
The keynote idea of the utility model is: benchmark sample lines and multiple spot spatial sampling pipe are arranged in parallel on sample presentation pipe
Express passway, express passway in multiple spot spatial sampling pipeline are respectively provided in road, benchmark sample lines and multiple spot spatial sampling pipeline
Front end connect more sampling branch pipes, sample and switch valve be set on branch pipe, can be only when only carrying out nitrous oxides concentration detection
Open benchmark sample lines or multiple spot spatial sampling pipeline, both make to be mutually backups, when ensuring pipeline cleaning not in forfeit
Sampling branch pipe on multiple spot spatial sampling pipeline only need to all be opened or no longer be switched at this time by sample.
When space distribution situation if necessary to monitor nitrogen oxides, then make benchmark sample lines and multiple spot spatial sampling pipe
Put into operation state on road, and benchmark sample lines take out flue gas by express passway, then samples and examines from express passway
It surveys, the foundation as adjustment ammonia spraying amount；And multiple spot spatial sampling pipeline then replaces sample presentation with benchmark sample lines, and passes through switch
The sample point of Vavle switching multiple spot spatial sampling pipeline, until multiple spot spatial sampling pipe by pipe each point wheel survey finish.Due to multiple spot
Switching time of the spatial sampling pipeline then between benchmark sample lines is very short, then can maintain the detected value of benchmark sample lines
It is constant, maintain the continual and steady control of spray ammonia total amount.
The detected value of the sample presentation detected value of each point in spatial sampling pipeline and respective preceding adjacent benchmark sample lines is done into ratio
Perhaps the detected value after difference or each sampled point desulfurization does ratio or difference, i.e. the benchmark sampling pipe to change over time
The detected value on road or the detected value of neat stress do reference, reduce the time with the relativeness between the two and examine to each point in space
The influence of survey, with better grasp nitrogen oxides distribution uniformity, for subsequent each point ammonia spraying amount adjusting provide it is more accurate
Foundation.
Specific device as shown in Figure 1, be provided with benchmark sample lines and multiple spot sky parallel on sample presentation pipe in the present embodiment
Between sample lines, benchmark sample lines are identical as the main structure of multiple spot spatial sampling pipeline, only benchmark sample lines use
Single-point employing mode, and 12 sampling branch pipes are then provided in multiple spot spatial sampling pipeline, it samples and first switch is installed on branch pipe
Valve 2.For ease of description, the gas passage that benchmark sample lines are formed is known as A channel, multiple spot spatial sampling pipeline is formed
Gas passage is known as channel B, and the setting in flue 1 for respectively sampling branch pipe is as shown in Figure 2.Due to the main structure phase of the two
Together, by taking A channel as an example, its specific structure is illustrated.
Express passway 3 is set in A channel, sampling pipe is connected in express passway 3, the caliber of sampling pipe is less than express passway 3
Caliber.Whirlwind dust separator 4 is set in express passway 3, and cigarette is arranged in the central part of the gas outlet of whirlwind dust separator 4
The gas outlet of the air inlet of air filter 7, smoke filter 7 connects sampling pump 9, the outlet of sampling pump 9 by third switch valve 8
The air inlet of mouth connection triple valve 10, the gas outlet connection sample presentation pipe of triple valve 10, another gas outlet are connected to outlet channel 16.
Extra flue gas enters the back segment of express passway 3 in 4 gas outlet of whirlwind dust separator.
For simplied system structure, and the quantity of reduction smoke evacuation pump 17 as far as possible while increasing flue gas flow, A is led to
The back segment of express passway 3 is both connected on collecting pipe 5 in road and channel B, installation smoke evacuation pump 17 on collecting pipe 5.
In order to realize the cleaning of oxygen filter, the bottom and side wall of smoke filter 7 is connected to by the 4th switch valve 11
Compressed gas source 12 by the working condition of the 4th switch valve 11 of control, can realize the blowback cleaning of smoke filter 7, and energy
It is enough to carry out blowback from bottom and side wall direction, so that cleaning is more thorough.
In order to realize that the crosstalk of flue gas is cleared up and prevented in the segmentation blowback of express passway 3, in 4 rear end of whirlwind dust separator
Express passway 3 on be also provided with second switch valve 6, and in A channel express passway front end install first switch valve 2, make
It obtains second switch valve 6 and first switch valve 2 cooperates, realize the segmented blowback cleaning of express passway 3, blowback can be enhanced
The pressure of air-flow keeps cleaning more thorough.It also is respectively provided with insulating layer in express passway 3 and sampling pipe, to maintain the height of flue gas
Temperature state avoids the ingredient in flue gas from dew point phenomenon occur, provides safeguard to be convenient to clean smoke filter 7.
The course of work of the utility model is as follows:
In use, the front end of express passway 3 in two channel A, B is both connected on flue 1, rear end is collected by collecting pipe 5
In be connected on flue 1, different parts that the sampling branch pipe 15 of channel B front end is connected on the same section of flue 1 are quickly led to
It is connected on flue 1 behind road 3 by the concentration of collecting pipe 5.Sample presentation pipe is sequentially connected fume-dehydrating device 13 and nitrogen oxides detection
Instrument 14.
Be mutually backups working condition: it is assumed that A channel will enter sample presentation working condition, unlatching first switch valve 2, second are opened
Valve 6, third switch valve 8, smoke evacuation pump 17 and sampling pump 9 are closed, triple valve 10 is made to be connected to outlet channel 16, is at for shape is surveyed
State.It realizes that the Wind Volume of flue gas transmits using the larger interior diameter of its express passway 3, quickly reaches detection instrument cubicle through cyclone dust removal
Carry out smoke sampling again afterwards, sample gas enters smoke filter 7 after two-stage dust removal, sent out by sampling pump 9, work a period of time
Afterwards, when the flue gas in flue 1 is discharged from triple valve 10, triple valve 10 is switched into sample presentation pipe, is nitrogen oxides detector 14
Conveying detection sample gas.
Work are waited for a period of time, when needing to clear up the dust on smoke filter 7, first by 2 He of first switch valve of channel B
Second switch valve 6 is opened, and triple valve 10 connects outlet channel 16, is made it into for survey state, after standby survey state, by threeway
Valve 10 switches to sample presentation pipe, is transformed into sample presentation state by standby survey state, closes third switch valve 8, the smoke evacuation pump 17 of A channel at this time
With sampling pump 9, the 4th switch valve 11 is opened, the compressed air of compressed gas source 12 is entered into smoke filter 7, to smoke filter
7 carry out blowback from bottom and side wall, by flue dust blowback air-returen flue 1, during blowback, can pass through switch first switch
Valve 2 and second switch valve 6 realize the segmentation blowback of express passway 3, keep flue dust cleaning more thorough.It so successively works in standby
Survey, sample presentation and blowback cleaning work state, replace by with channel B, so that system always has the output of sample gas, avoid the prior art
In disruption.
When monitoring nitrogen oxides spatial distribution, opens A, the first switch valve 2 in channel B, second switch valve 6, third and open
Valve 8, smoke evacuation pump 17 and sampling pump 9 are closed, the b1 test point in channel B is connected, so that triple valve 10 is connected to outlet channel 16, make at its
In standby survey state.When the flue gas in flue 1 is discharged from triple valve 10, the triple valve 10 of A channel is switched into sample presentation pipe, is
The conveying detection sample gas of nitrogen oxides detector 14, measured value a1, channel B is still in standby survey state at this time.Sample gas to A channel
It has been detected that, the triple valve 10 in its channel is connected to outlet channel 16, be at standby survey state；At this time by the threeway of channel B
Valve 10 switches to sample presentation pipe, and the concentration value of measurement b1 test point is b1.The triple valve 10 of A channel is switched into sample presentation pipe, again
Sample presentation, measured value a2, while the b1 test point in channel B will be closed, b2 test point is opened, standby survey state is at.To
When the sample gas of b2 test point is discharged from triple valve 10, A channel is switched into standby survey state again, by the triple valve in channel B
10 switch to sample presentation state, detect the sample gas of b2 test point, measured value b2.In this way, A channel replaces sample presentation with channel B, and
The switching in channel B between 12 test points is completed during alternate, finishes the survey of its each point wheel, so that ai and bi are measured, ai
For i-th of detected value of A channel, bi is i-th of detected value of channel B, the natural number in i value 1~12.
In detecting channel B when each test point, just switch when being flowed out from its triple valve 10 due to the sample gas of channel B, when
Between it is very short, can ignore completely, assert the detected value of A channel still and be the detected value before switching, control the adjusting of total ammonia spraying amount.
And bi/ai is calculated, or calculate bi-ai, to reduce influence of the time to nitrous oxides concentration.It can also be by detecting neat stress
Detected value after the sample presentation detected value of each point in spatial sampling pipeline and each sampled point desulfurization is done ratio by the concentration of middle nitrogen oxides
Value or difference are also possible to the algorithm of both other reactions relativeness, to reduce influence of the time to nitrous oxides concentration.
Neat stress described above refers to flue gas to be discharged after desulfurization or/and dedusting.
It is, of course, also possible to which more sampling branch pipes 15 are arranged in the inlet end in A channel, pass through the work shape of first switch valve 2
State realizes the switching of sampled point.
The above descriptions are merely preferred embodiments of the present invention, is not to make other forms to the utility model
Limitation, any person skilled in the art is changed or is modified as possibly also with the technology contents of the disclosure above equivalent
The equivalent embodiment of variation.But it is all without departing from the content of the technical scheme of the utility model, the technology according to the utility model is real
Matter any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the guarantor of technical solutions of the utility model
Protect range.
Claims (7)
1. a kind of device of quickly detection nitrogen oxides in effluent concentration and its spatial distribution, including sample presentation pipe, it is characterised in that:
Parallel connection has benchmark sample lines and multiple spot spatial sampling pipeline on the sample presentation pipe, and benchmark sample lines and multiple spot space are adopted
Express passway is respectively provided in sample pipeline, the express passway front end in multiple spot spatial sampling pipeline connects more sampling branch pipes, sampling
First switch valve is installed on branch pipe；
Sampling pipe is connected in express passway, the caliber of sampling pipe is less than the caliber of express passway, smoke filtration is arranged on sampling pipe
The sampling pipe of device, smoke filter rear end is connected to sample presentation pipe by triple valve, the air inlet connection smoke filter of triple valve
Gas outlet, gas outlet connection sample presentation pipe, another gas outlet are connected to discharge-channel, and sample presentation pipe is that nitrous oxides concentration detector mentions
For sample gas.
2. the device of quick detection nitrogen oxides in effluent concentration according to claim 1 and its spatial distribution, feature
It is: whirlwind dust separator is set in the express passway, sampling pipe is arranged in the low dirt outlet of whirlwind dust separator.
3. the device of quick detection nitrogen oxides in effluent concentration according to claim 2 and its spatial distribution, feature
It is: also sets up smoke sampling pump on the sampling pipe, smoke sampling pump is located at the front end of triple valve.
4. the device of quick detection nitrogen oxides in effluent concentration according to claim 3 and its spatial distribution, feature
Be: the smoke sampling pump is between smoke filter and triple valve, adopting between smoke sampling pump and smoke filter
Third switch valve is added on sample pipe, smoke filter is connected to compressed gas source by the 4th switch valve.
5. the device of quick detection nitrogen oxides in effluent concentration according to claim 4 and its spatial distribution, feature
Be: the compressed gas source is connected to the bottom wall and side wall of smoke filter by the 4th switch valve.
6. the device of quick detection nitrogen oxides in effluent concentration according to any one of claims 1 to 5 and its spatial distribution,
It is characterized by: the back segment of express passway is connected to collecting pipe, installation smoke evacuation pump on collecting pipe.
7. the device of quick detection nitrogen oxides in effluent concentration according to claim 6 and its spatial distribution, feature
It is: second switch valve is set in the express passway of the sampling pipe rear end, the front end peace of express passway in benchmark sample lines
Fill first switch valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820856204.9U CN208206597U (en) | 2018-06-05 | 2018-06-05 | A kind of device of quick detection nitrogen oxides in effluent concentration and its spatial distribution |
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| CN201820856204.9U CN208206597U (en) | 2018-06-05 | 2018-06-05 | A kind of device of quick detection nitrogen oxides in effluent concentration and its spatial distribution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103221A (en) * | 2020-01-02 | 2020-05-05 | 神华神东煤炭集团有限责任公司 | Detection method and detection system for dust space-time distribution of fully mechanized coal mining face of coal mine |
-
2018
- 2018-06-05 CN CN201820856204.9U patent/CN208206597U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103221A (en) * | 2020-01-02 | 2020-05-05 | 神华神东煤炭集团有限责任公司 | Detection method and detection system for dust space-time distribution of fully mechanized coal mining face of coal mine |
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