CN203564964U - On-line monitoring device on mixing uniformity behind SCR denitrification ammonia injection grid - Google Patents
On-line monitoring device on mixing uniformity behind SCR denitrification ammonia injection grid Download PDFInfo
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- CN203564964U CN203564964U CN201320767440.0U CN201320767440U CN203564964U CN 203564964 U CN203564964 U CN 203564964U CN 201320767440 U CN201320767440 U CN 201320767440U CN 203564964 U CN203564964 U CN 203564964U
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Abstract
The utility model provides an on-line monitoring device on mixing uniformity behind an SCR denitrification ammonia injection grid. The on-line monitoring device comprises an SCR reactor, an ammonia injection grid and a tail flue, and is characterized in that a plurality of smoke gas collecting and measuring points are arranged in the tail flue positioned in front of an inlet of the SCR reactor and behind the ammonia injection grid, each smoke gas collecting and measuring point is connected to a smoke gas analysis instrument through a collection passage and a passage switching device, a data output port of the smoke gas analysis instrument is connected to a microcomputer through a microcomputer data connecting wire, and the control end of the passage switching device is connected to a control signal output end of a microcomputer. The on-line monitoring device has the advantages that the ammonia injection mixing uniformity can be fast analyzed, the basis can be provided for the ammonia injection quantity regulation of the ammonia injection grid, and the denitrification efficiency is improved.
Description
Technical field
The utility model relates to a kind of coal-fired plant flue gas denitration effect monitoring device, belongs to generating equipment technical field, is mixing uniformity on-Line Monitor Device after a kind of SCR denitration ammonia-spraying grid specifically.
Background technology
Coal-burning power plant's contained nitrogen oxide from the flue gas of combustion system discharge can cause photochemical reaction under the effect of sunlight, forms photochemical fog, thereby causes serious atmosphere pollution, and the control of nitrogen oxide is the emphasis that national environmental protection is investigated.Due to the limitation of low nitrogen burning technology in stove, make the discharge of nitrogen oxide can not reach gratifying degree at present, in order further to reduce the discharge of nitrogen oxide, must carry out denitrating flue gas processing.SCR (SCR) is to use one of nitrogen oxide containing gas denitration technology the most widely, and SCR technology is typically chosen in reactor front end, and the reducing agent using ammoniacal liquor (liquefied ammonia) as reaction sprays into flue after atomization.Conventionally the jetting device of selecting is ammonia-spraying grid, adopts ammonia-spraying grid can improve the distributing homogeneity of reducing agent, improves reaction efficiency.
But, the reducing agent that comprises at present ammonia-spraying grid sprays into device, greatest drawback is all to spray into the uniformity that reducing agent mixes by on-line monitoring, cannot carry out the adjustment of ammonia spraying amount for the concentration difference distributing, cause occurring that reduction efficiency does not reach design load, the escaping of ammonia is excessive, causes the problems such as secondary emission pollution.
Summary of the invention
The problems referred to above that the utility model exists for solving prior art, provide mixing uniformity on-Line Monitor Device after a kind of SCR denitration ammonia-spraying grid, and the uniformity of can rapid analysis spray ammonia mixing, for the ammonia spraying amount adjustment of ammonia-spraying grid provides foundation, improves nitric efficiency.
The purpose of this utility model is achieved through the following technical solutions:
Mixing uniformity on-Line Monitor Device after a kind of SCR denitration ammonia-spraying grid, comprise SCR reactor, ammonia-spraying grid, back-end ductwork, it is characterized in that, in back-end ductwork before the entrance of described SCR reactor, after ammonia-spraying grid, several smoke collecting measuring points are set, described each smoke collecting measuring point is connected to a flue gas analyzer via acquisition channel and censor key, the data-out port of described flue gas analyzer is connected to a microcomputer via Microcomputer Data connecting line, and the control end of censor key is connected to the control signal output of microcomputer.
Improvement to technique scheme: described smoke collecting measuring point is installed in described back-end ductwork perpendicular to flue gas trend.
Further improvement to technique scheme: described smoke collecting measuring point is along laterally uniform three groups of back-end ductworks, every group all comprises that a front-end collection measuring point, a middle part gather measuring point and a rear end collection measuring point, and described front-end collection measuring point, middle part gather measuring point and rear end collection measuring point is longitudinally uniform along flue.
Further improvement to technique scheme: described acquisition channel comprises collection subchannel and gathers main channel, described censor key comprises subchannel switch and main channel switch, described subchannel switch and main channel switch are the change-over switch of three entrances and an outlet, every group of three smoke collecting measuring points are connected to subchannel switch by gathering subchannel respectively, the outlet of three subchannel switch is connected with the entrance of main channel switch respectively, and switch outlet in described main channel is connected to described flue gas analyzer by gathering main channel.
Advantage of the present utility model and good effect are:
Smoke collecting point of the present utility model is evenly distributed in the flue after ammonia-spraying grid, and the layout of measuring point can guarantee to monitor the ammonia concentration of each location point of spray ammonia rear pass.Each measuring point has independent acquisition channel to be connected to flue gas analyzer, has guaranteed that each measuring point does not interfere with each other, and can to some flue position, carry out ammonia concentration monitor and adjustment separately targetedly.Whole collection and analytic process are online processing, can fast monitored and spray ammonia mixing uniformity is adjusted.
Accompanying drawing explanation
Fig. 1 is the johning knot composition of mixing uniformity on-Line Monitor Device after the utility model SCR denitration ammonia-spraying grid;
Fig. 2 be after the utility model SCR denitration ammonia-spraying grid in mixing uniformity on-Line Monitor Device smoke collecting measuring point distribute and acquisition channel arranges schematic diagram.
In figure: 1-back-end ductwork, 2-ammonia-spraying grid, 3-SCR reactor, 4-flue gas move towards arrow, 5-smoke collecting measuring point, 5-1 front-end collection measuring point, 5-2 middle part and gather measuring point, 5-3 rear end and gather measuring point, 6-censor key, 6-1-subchannel switch, 6-2 main channel switch, 7-and gather main channel, 8-flue gas analyzer, 9-Microcomputer Data connecting line, 10-microcomputer, 11-and gather subchannel.
The specific embodiment
Referring to Fig. 1, Fig. 2, the embodiment of mixing uniformity on-Line Monitor Device after a kind of SCR denitration of the utility model ammonia-spraying grid, comprise SCR reactor 3, ammonia-spraying grid 2, back-end ductwork 1, in back-end ductwork 1 before the entrance of SCR reactor 3, after ammonia-spraying grid 2, several smoke collecting measuring points 5 are set, each smoke collecting measuring point 5 is connected to a flue gas analyzer 8 via acquisition channel and censor key 6.The data-out port of flue gas analyzer 8 is connected to a microcomputer 10 via Microcomputer Data connecting line 9, and the control end of censor key 6 is connected to the control signal output of microcomputer 10.In microcomputer 10, record the ammonia concentration data of each collector and calculate ammonia concentration mixing uniformity.
Particularly, smoke collecting measuring point 5, perpendicular to (Fig. 1 flue gas moves towards shown in arrow 4) flue gas trend, is arranged in back-end ductwork 1.
As shown in Figure 2, smoke collecting measuring point 5 is along laterally uniform three groups of back-end ductworks 1, every group all comprises that a front-end collection measuring point 5-1, a middle part gather measuring point 5-2 and a rear end collection measuring point 5-3, and described front-end collection measuring point 5-1, middle part gather measuring point 5-2 and rear end collection measuring point 5-3 is longitudinally uniform along flue 1.Acquisition channel comprises collection subchannel 11 and gathers main channel 7, described censor key 6 comprises subchannel switch 6-1 and main channel switch 6-2, and subchannel switch 6-1 and main channel switch 6-2 are the change-over switch of three entrances and an outlet.Every group of three smoke collecting measuring points (front-end collection measuring point 5-1, middle part gather measuring point 5-2 and rear end gathers measuring point 5-3) are connected to a subchannel switch 6-1 by gathering subchannel 11 respectively, the outlet of three subchannel switch 6-1 is connected with the entrance of main channel switch 6-2 respectively, and the outlet of described main channel switch 6-2 is connected to described flue gas analyzer 8 by gathering main channel 7.
During monitoring device work, first select smoke collecting measuring point: by microcomputer 10 outputs, select signal to main channel switch 6-2, open certain and gather subchannel (as gathered subchannel A), close other simultaneously and gather subchannel (as gathered subchannel B, C), output selects signal to subchannel switch 6-1 again, open certain smoke collecting measuring point (as smoke collecting measuring point A1), close other smoke collecting measuring points (as smoke collecting measuring point A2 simultaneously, A3), the flue gas of the smoke collecting measuring point of now choosing is imported into flue gas analyzer 8, carry out ammonia concentration analysis.Ammonia concentration data after analyzing is transferred in microcomputer 10 via Microcomputer Data connecting line 9, and in microcomputer 10, records the ammonia concentration data of this measuring point.By that analogy, after nine smoke collecting measuring points all complete measurement record data, by microprocessor based computer, analyzed the spray ammonia concentration mixing uniformity of SCR reactor 3 entrances.
Monitoring device is to work incessantly online, also the i.e. ammonia concentration of nine smoke collecting measuring points of cycle detection constantly, calculate a series of spray ammonia concentration mixing uniformity values, this uniformity value is analyzed to the scheme that adjusts ammonia-spraying grid 2 ammonia spraying amounts, then drive ammonia-gas spraying device adjustment spray ammonia.
Certainly, above-mentioned explanation is not to restriction of the present utility model, and the utility model is also not limited to above-mentioned giving an example; those skilled in the art; in essential scope of the present utility model, the variation of having done, remodeling, interpolation or replacement, also should belong to protection domain of the present utility model.
Claims (4)
1. mixing uniformity on-Line Monitor Device after a SCR denitration ammonia-spraying grid, comprise SCR reactor, ammonia-spraying grid, back-end ductwork, it is characterized in that, before the entrance of described SCR reactor, in back-end ductwork after ammonia-spraying grid, several smoke collecting measuring points are set, described each smoke collecting measuring point is connected to a flue gas analyzer via acquisition channel and censor key, the data-out port of described flue gas analyzer is connected to a microcomputer via Microcomputer Data connecting line, the control end of censor key is connected to the control signal output of microcomputer.
2. according to mixing uniformity on-Line Monitor Device after SCR denitration ammonia-spraying grid claimed in claim 1, it is characterized in that, described smoke collecting measuring point is installed in described back-end ductwork perpendicular to flue gas trend.
3. according to mixing uniformity on-Line Monitor Device after the SCR denitration ammonia-spraying grid described in claim 1 or 2, it is characterized in that, described smoke collecting measuring point is along laterally uniform three groups of back-end ductworks, every group all comprises that a front-end collection measuring point, a middle part gather measuring point and a rear end collection measuring point, and described front-end collection measuring point, middle part gather measuring point and rear end collection measuring point is longitudinally uniform along flue.
4. according to mixing uniformity on-Line Monitor Device after SCR denitration ammonia-spraying grid claimed in claim 3, it is characterized in that, described acquisition channel comprises collection subchannel and gathers main channel, described censor key comprises subchannel switch and main channel switch, described subchannel switch and main channel switch are the change-over switch of three entrances and an outlet, every group of three smoke collecting measuring points are connected to subchannel switch by gathering subchannel respectively, the outlet of three subchannel switch is connected with the entrance of main channel switch respectively, the switch outlet of described main channel is connected to described flue gas analyzer by gathering main channel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320767440.0U CN203564964U (en) | 2013-11-29 | 2013-11-29 | On-line monitoring device on mixing uniformity behind SCR denitrification ammonia injection grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320767440.0U CN203564964U (en) | 2013-11-29 | 2013-11-29 | On-line monitoring device on mixing uniformity behind SCR denitrification ammonia injection grid |
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| CN203564964U true CN203564964U (en) | 2014-04-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854597A (en) * | 2016-04-14 | 2016-08-17 | 国网河南省电力公司电力科学研究院 | Ammonia spraying grating intelligent optimization and adjustment system and method for SCR denitration device |
| CN105974950A (en) * | 2016-07-05 | 2016-09-28 | 王巧英 | Intra-furnace flue gas denitration ammonia spraying intelligent system and control method thereof |
| CN106596867A (en) * | 2017-01-19 | 2017-04-26 | 国电科学技术研究院 | SCR outlet flue cross section nitric oxide and oxygen concentration online monitoring method and system |
-
2013
- 2013-11-29 CN CN201320767440.0U patent/CN203564964U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105854597A (en) * | 2016-04-14 | 2016-08-17 | 国网河南省电力公司电力科学研究院 | Ammonia spraying grating intelligent optimization and adjustment system and method for SCR denitration device |
| CN105974950A (en) * | 2016-07-05 | 2016-09-28 | 王巧英 | Intra-furnace flue gas denitration ammonia spraying intelligent system and control method thereof |
| CN105974950B (en) * | 2016-07-05 | 2019-07-05 | 王巧英 | Ammonia intelligence system and its control method are sprayed in inner flue gas of the stove denitration |
| CN106596867A (en) * | 2017-01-19 | 2017-04-26 | 国电科学技术研究院 | SCR outlet flue cross section nitric oxide and oxygen concentration online monitoring method and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20171129 |