CN104458869A - Online ammonia escape monitoring and analyzing method and online ammonia escape monitoring and analyzing instrument - Google Patents
Online ammonia escape monitoring and analyzing method and online ammonia escape monitoring and analyzing instrument Download PDFInfo
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- CN104458869A CN104458869A CN201410626972.1A CN201410626972A CN104458869A CN 104458869 A CN104458869 A CN 104458869A CN 201410626972 A CN201410626972 A CN 201410626972A CN 104458869 A CN104458869 A CN 104458869A
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Abstract
The invention discloses an online ammonia escape monitoring and analyzing method and an online ammonia escape monitoring and analyzing instrument, relating to the technical field of environment monitoring. The online ammonia escape monitoring and analyzing method comprises the following steps: sampling and absorbing escape ammonia, detecting the content of the escape ammonia, measuring the sampling volume of sample gas, and calculating the concentration of the escape ammonia. The online ammonia escape monitoring and analyzing instrument comprises a sampling and absorbing unit, a detecting unit and an analyzing and controlling unit. According to the invention, an extraction-type sampling method is adopted; the sample ammonia is extracted from a flue duct by utilizing the extraction and suction force of a sampling pump, and is filtered, and the filtered sample ammonia is conveyed into the instrument to be detected, so that dust in the flue gas can be prevented from affecting the detection result. According to the invention, the concentration of the escape ammonia in the sample gas is detected by adopting an ammonia gas sensitive electrode method, and the method and the instrument have the advantages of short detection cycle, high detection precision, great anti-interference capability and the like.
Description
Technical field
The present invention relates to environmental monitoring technology field, particularly relate to a kind of the escaping of ammonia on-line monitoring analytical approach and instrument.
Background technology
The fossil fuel combustion process such as coal can discharge a large amount of oxides of nitrogen (NOx) pollutant, can form acid rain, photo-chemical smog etc. in NOx emission to air, bring very large harm to the production of people and life.Current most of Thermal generation unit and coal-burning boiler have all installed selective catalytic reduction (SCR) or SNCR method (SNCR) equipment for denitrifying flue gas, in order to reduce the discharge of NOx.SCR/SNCR ratio juris uses liquefied ammonia or ammoniacal liquor to inject denitrification apparatus as reductive agent, at high temperature generates ammonia (NH
3), there is reduction reaction in the NOx in ammonia and flue gas, generates innoxious N
2and H
2o.
In actual process process, the NOx in ammonia and flue gas can not complete reaction just, and probably have a small amount of ammonia to have neither part nor lot in reduction reaction, and escape out from equipment for denitrifying flue gas outlet, this part ammonia is called escape ammonia, is also the escaping of ammonia.Escape ammonia can cause environmental pollution, and increases operating cost.Escape ammonia can corrode catalyst module, causes catalyst deactivation and blocking, greatly shortens catalyst life.Escape ammonia can with the SO in flue gas
3react generation ammonium sulfate, and precipitation is attached to the surface of upstream device, causes equipment corrosion, maintenance cost and workload are significantly increased.Therefore SCR/SNCR denitrification process needs to carry out on-line monitoring analysis to the escaping of ammonia, to optimize the injection rate IR of reductive agent ammonia in SCR/SNCR technique, thus improves denitration efficiency, avoids environmental pollution.Control the generation that the escaping of ammonia can also reduce ammonium salt effectively, avoid causing the corrosion to upstream device and harm.
At the escaping of ammonia on-line monitoring analysis field, current mainstream technology both domestic and external is in-situ type Laser analysis.Its principle utilizes the monochromaticity of laser and analyzes the absorption characteristic of specific gas.Analytical instrument is generally designed to the structure of probe type, is directly installed on flue.Laser emission end and receiving end are arranged on flue one or both sides.Laser enters flue by transmitting terminal window, and receiving end is reflected or after reception, entered analytical instrument.Utilizing emitted light by flue gas time to NH
3absorption information be retained in light signal, namely form absorption spectrum, by finally obtaining NH to the analysis of absorption spectrum
3concentration.
From current engineering practice, there is following shortcoming in in-situ type Laser analysis:
(1) owing to being that original position is installed, instrument cannot carry out demarcating and verifying, measuring accuracy rate cannot ensure;
(2) because the high ash content of the many uses in coal-burning power plant of China is coal-fired, exiting flue gas dustiness is very high.Laser, through flue gas to be measured, produces a large amount of light refractions and diffuse reflection, has had a strong impact on laser piercing power, causes measured deviation large, even can measure out;
(3) on-the-spot dust causes transmitting terminal and receiving end eyeglass to block, and needs often to safeguard; Flue vibration causes transmitting terminal can not aim at receiving end, instrument non-metering or data jump.
Summary of the invention
For solving the problem, the invention provides a kind of the escaping of ammonia on-line monitoring analytical approach and instrument.The present invention adopts extraction-type sampling method, utilizes the suction force of sampling pump in flue, extract fume sample (hereinafter referred to as sample gas), is transported in instrument and detects after filtration.The present invention adopts Ammonia Gas Sensor Electrode Method to detect the concentration of escape ammonia in sample gas.
Ammonia Gas Sensor Electrode Method for detecting the ammonia nitrogen in black water, has the advantages such as sense cycle is short, accuracy of detection is high, antijamming capability is strong at present.Its principle is as follows: ammonia gas-sensing electrode is a combination electrode, and with pH glass electrode for indicator electrode, silver-silver chloride electrode is contrast electrode.In water sample, add strong base solution pH value is brought up to more than 12, all ammonium ions are all converted into the ammonia of gaseous state, the ammonia generated is because diffusion is by one deck semi-permeable diaphragm (water and other ions then not by), the inside entering ammonia gas-sensing electrode participates in chemical reaction, change the pH value of electrode interior electrolytic solution, thus cause the change of the electromotive force of ammonia gas-sensing electrode.In the change of electromotive force and water sample, the content of ammonia is linear, therefore according to the change of the electromotive force of ammonia gas-sensing electrode, can measure the content of ammonia in water sample.
The invention provides a kind of the escaping of ammonia on-line monitoring analytical approach.Concrete scheme is as follows:
The escaping of ammonia on-line monitoring analytical approach, comprises the following steps:
Step 1: start sampling pump, samples to the flue gas containing escape ammonia, is inhaled in spray thrower, fully contacts with pure water, make the escape ammonia in sample gas be dissolved in pure water completely after sample gas dust removal by filtration, forms ammoniacal liquor liquid to be measured;
Step 2: sample to setting-up time, close sampling pump, stop sampling, ammoniacal liquor liquid to be measured in extraction spray thrower is in detection cell, in detection cell, add releasing agent, make ammoniacal liquor liquid to be measured discharge ammonia, according to the change of the electromotive force of ammonia gas-sensing electrode, measure the content of ammonia in ammoniacal liquor liquid to be measured, namely the content M of escape ammonia in sample gas;
Step 3: according to sampling time and sampling flow, measures sample gas sampling volume V;
Step 4: the concentration C calculating escape ammonia in sample gas;
In described sample gas, the concentration of escape ammonia calculates according to formula (1):
（1）
C: the concentration of escape ammonia in sample gas, mg/m
3;
M: the content of escape ammonia in sample gas, mg;
V: sample gas sampling volume, m
3.
The present invention also provides a kind of the escaping of ammonia on-line monitoring analytical instrument applying said method, and described the escaping of ammonia on-line monitoring analytical instrument comprises sampling absorptive unit and detecting unit;
Described sampling absorptive unit comprises sampling pipe, filtrator, trace pipe, spray thrower, pure water bottle, dehydrator, flowmeter, sampling pump; One end of described sampling pipe is positioned at flue, and the other end connects filtrator, and one end of described trace pipe connects filtrator, and the other end connects the air intake opening of spray thrower; The water inlet of described spray thrower connects pure water bottle by pipeline, and gas outlet connects dehydrator by pipeline; Described dehydrator is by pipeline connection traffic meter; Described flowmeter connects sampling pump by pipeline;
Described detecting unit comprises valve, syringe, releasing agent bottle, detection cell, ammonia gas-sensing electrode, solenoid valve; Described valve has multiple port, and one of them port connects the water delivering orifice of spray thrower by pipeline, and a port connects syringe by pipeline, and a port is by pipeline Connection Release agent bottle, and a port connects detection cell by pipeline; Described ammonia gas-sensing electrode is plugged in detection cell; Described detection cell is by pipeline connected electromagnetic valve;
Described the escaping of ammonia on-line monitoring analytical instrument also comprises analysis controlling unit, and analysis controlling unit carries out Automated condtrol, data acquisition and procession, storage and output to instrument.
Beneficial effect of the present invention: the present invention adopts extraction-type sampling method, utilizes the suction force of sampling pump to extract sample gas in flue, is transported in instrument and detects, avoid the dust in flue gas to affect testing result after filtration.The present invention adopts Ammonia Gas Sensor Electrode Method to detect the concentration of escape ammonia in sample gas, has the advantages such as sense cycle is short, accuracy of detection is high, antijamming capability is strong.
Accompanying drawing explanation
Fig. 1 is the workflow diagram of the escaping of ammonia on-line monitoring analytical instrument in the embodiment of the present invention.
Fig. 2 is the structural representation of the escaping of ammonia on-line monitoring analytical instrument in the embodiment of the present invention.
Fig. 3 is the structural representation that in the embodiment of the present invention, the escaping of ammonia on-line monitoring analytical instrument increases analysis controlling unit.
Embodiment
In order to more fully understand technology contents of the present invention, below in conjunction with specific embodiment technical scheme of the present invention being introduced further and illustrating.
The escaping of ammonia on-line monitoring analytical instrument as shown in Figure 2, comprises sampling absorptive unit and detecting unit.Sampling absorptive unit comprises sampling pipe 1, filtrator 2, trace pipe 3, spray thrower 4, pure water bottle 5, dehydrator 6, flowmeter 7, sampling pump 8.Detecting unit comprises valve 9, syringe 10, releasing agent bottle 11, detection cell 12, ammonia gas-sensing electrode 13, solenoid valve 14.
One end of sampling pipe 1 is positioned at flue, and the other end connects filtrator 2.One end of trace pipe 3 connects filtrator 2, and the other end connects the air intake opening of spray thrower 4.The water inlet of spray thrower 4 connects pure water bottle 5 by pipeline, and gas outlet connects dehydrator 6 by pipeline.Dehydrator 6 is by pipeline connection traffic meter 7.Flowmeter 7 connects sampling pump 8 by pipeline.Sampling pipe 1 is for gathering sample gas.Filtrator 2, for filtering the dust in sample gas, avoids the dust in sample gas to affect testing result.Trace pipe 3 is for carrying sample gas.Filtrator 2 and trace pipe 3 are provided with heating arrangement, for heating sample gas, avoid the condensation and can not accurately detecting in sampling process of sample gas.Spray thrower 4, for spraying pure water, makes the escape ammonia in sample gas be dissolved in pure water completely, forms ammoniacal liquor liquid to be measured.Pure water bottle 5 is for storing pure water.Dehydrator 6, for removing the moisture in sample gas, avoids corrosion flowmeter and sampling pump.Flowmeter 7 is for measuring sampling flow.Sampling pump 8 is for providing the suction force needed for sampling.
Valve 9 has multiple port, and one of them port connects the water delivering orifice of spray thrower 4 by pipeline, and a port connects syringe 10, port by pipeline and connects detection cell 12 by pipeline Connection Release agent bottle 11, port by pipeline.Ammonia gas-sensing electrode 13 is plugged in detection cell 12.Detection cell 12 is by pipeline connected electromagnetic valve 14.Syringe 10 is for extracting ammoniacal liquor liquid to be measured and releasing agent.Releasing agent bottle 11 is for storing releasing agent.Ammonia gas-sensing electrode 13 is for detecting the content of escape ammonia in sample gas.Solenoid valve 14 is for discharging the ammoniacal liquor liquid to be measured in detection cell 12.
The workflow of above-mentioned the escaping of ammonia on-line monitoring analytical instrument as shown in Figure 1, comprises the following steps.
Sampling absorbs escape ammonia: start sampling pump 8, samples to the flue gas containing escape ammonia; Under the suction function that sampling pump 8 produces, sample gas enters sampling pipe 1, trace pipe 3 is entered after filter 2 dedusting, then be inhaled in spray thrower 4, pure water is also inhaled in spray thrower 4 from pure water bottle 5 simultaneously, sample gas fully contacts in spray thrower 4 with pure water, makes the escape ammonia in sample gas be dissolved in pure water completely, forms ammoniacal liquor liquid to be measured; Be not drawn out of from spray thrower 4 by the sample gas of absorbing pure water, remove moisture through dehydrator 6, then by flowmeter 7, be finally sampled pump 8 and discharge instrument.
Detect the content of escape ammonia: sample to setting-up time, close sampling pump 8, stop sampling; The ammoniacal liquor liquid to be measured that syringe 10 is extracted in spray thrower 4 by valve 9 injects detection cell 12, and the releasing agent then extracted in releasing agent bottle 11 by valve 9 injects detection cell 12, makes ammoniacal liquor liquid to be measured discharge ammonia; According to the change of the electromotive force of ammonia gas-sensing electrode 13, measure the content of ammonia in ammoniacal liquor liquid to be measured, namely the content M of escape ammonia in sample gas; After detection terminates, open solenoid valve 14, discharge the ammoniacal liquor liquid to be measured in detection cell 12.
Measure sample gas sampling volume: according to the sampling flow of sampling time and flowmeter 7, measure sample gas sampling volume V.
Calculate the concentration of escape ammonia: the concentration C calculating escape ammonia in sample gas according to formula (1):
（1）
C: the concentration of escape ammonia in sample gas, mg/m
3;
M: the content of escape ammonia in sample gas, mg;
V: sample gas sampling volume, m
3.
The escaping of ammonia on-line monitoring analytical instrument as shown in Figure 3, analysis controlling unit 15 is increased in instrument, analysis controlling unit 15 pairs of instruments carry out Automated condtrol, data acquisition and procession, storage and output, according to the sampling time of setting, monitoring analysis is carried out to sample gas chronologically, calculate and export the concentration of escape ammonia in sample gas.
The present invention adopts extraction-type sampling method, utilizes the suction force of sampling pump to extract sample gas in flue, is transported in instrument and detects, avoid the dust in flue gas to affect testing result after filtration.The present invention adopts Ammonia Gas Sensor Electrode Method to detect the concentration of escape ammonia in sample gas, has the advantages such as sense cycle is short, accuracy of detection is high, antijamming capability is strong.
The above only further illustrates technology contents of the present invention with embodiment, so that reader is easier to understand, but does not represent embodiments of the present invention and is only limitted to this, and any technology done according to the present invention extends or recreation, all by protection of the present invention.
Claims (3)
1. the escaping of ammonia on-line monitoring analytical approach, is characterized in that, comprises the following steps:
Step 1: start sampling pump, samples to the flue gas containing escape ammonia, is inhaled in spray thrower, fully contacts with pure water, make the escape ammonia in sample gas be dissolved in pure water completely after sample gas dust removal by filtration, forms ammoniacal liquor liquid to be measured;
Step 2: sample to setting-up time, close sampling pump, stop sampling, ammoniacal liquor liquid to be measured in extraction spray thrower is in detection cell, in detection cell, add releasing agent, make ammoniacal liquor liquid to be measured discharge ammonia, according to the change of the electromotive force of ammonia gas-sensing electrode, measure the content of ammonia in ammoniacal liquor liquid to be measured, namely the content M of escape ammonia in sample gas;
Step 3: according to sampling time and sampling flow, measures sample gas sampling volume V;
Step 4: the concentration C calculating escape ammonia in sample gas;
In described sample gas, the concentration of escape ammonia calculates according to formula (1):
（1）
C: the concentration of escape ammonia in sample gas, mg/m
3;
M: the content of escape ammonia in sample gas, mg;
V: sample gas sampling volume, m
3.
2. the escaping of ammonia on-line monitoring analytical instrument, is characterized in that: described the escaping of ammonia on-line monitoring analytical instrument comprises sampling absorptive unit and detecting unit;
Described sampling absorptive unit comprises sampling pipe, filtrator, trace pipe, spray thrower, pure water bottle, dehydrator, flowmeter, sampling pump; One end of described sampling pipe is positioned at flue, and the other end connects filtrator, and one end of described trace pipe connects filtrator, and the other end connects the air intake opening of spray thrower; The water inlet of described spray thrower connects pure water bottle by pipeline, and gas outlet connects dehydrator by pipeline; Described dehydrator is by pipeline connection traffic meter; Described flowmeter connects sampling pump by pipeline;
Described detecting unit comprises valve, syringe, releasing agent bottle, detection cell, ammonia gas-sensing electrode, solenoid valve; Described valve has multiple port, and one of them port connects the water delivering orifice of spray thrower by pipeline, and a port connects syringe by pipeline, and a port is by pipeline Connection Release agent bottle, and a port connects detection cell by pipeline; Described ammonia gas-sensing electrode is plugged in detection cell; Described detection cell is by pipeline connected electromagnetic valve.
3. the escaping of ammonia on-line monitoring analytical instrument according to claim 2, it is characterized in that: described the escaping of ammonia on-line monitoring analytical instrument also comprises analysis controlling unit, and analysis controlling unit carries out Automated condtrol, data acquisition and procession, storage and output to instrument.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104807964A (en) * | 2015-04-24 | 2015-07-29 | 西安热工研究院有限公司 | On-line detection device and method for gas-liquid transfer method escaping ammonia |
| CN104897743A (en) * | 2015-03-27 | 2015-09-09 | 北京京能电力股份有限公司石景山热电厂 | Analytic determination method for ammonia in denitration flue dust of flue gas of thermal power plant boiler |
| CN105004761A (en) * | 2015-06-26 | 2015-10-28 | 华电电力科学研究院 | Denitration system escaping ammonia on-line continuous monitoring device and method |
| CN105158422A (en) * | 2015-09-30 | 2015-12-16 | 华电电力科学研究院 | Device and method for measuring ammonia escape content in flue gas and ammonia escape content in smoke dust simultaneously |
| CN105561765A (en) * | 2015-12-17 | 2016-05-11 | 北京华科仪科技股份有限公司 | Pretreatment method and device for effectively absorbing escape ammonia in smoke |
| CN105806804A (en) * | 2016-04-06 | 2016-07-27 | 杭州绰美科技有限公司 | Integrated online monitoring instrument for monitoring ammonia escape during denitration |
| CN106198860A (en) * | 2016-06-28 | 2016-12-07 | 盐城工学院 | A kind of method and system of the escaping of ammonia detection |
| CN107632119A (en) * | 2017-09-28 | 2018-01-26 | 华电新疆发电有限公司乌鲁木齐热电厂 | Comparison device and its application method for the escaping of ammonia measuring instrument |
| CN111766349A (en) * | 2020-08-04 | 2020-10-13 | 浙江浙能技术研究院有限公司 | Partitioned sampling ammonia escape measurement system and method |
| CN111982610A (en) * | 2020-08-12 | 2020-11-24 | 北京国电龙源环保工程有限公司 | On-line continuous detection device for ammonia in gas by using chemical spectrophotometry |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105158422A (en) * | 2015-09-30 | 2015-12-16 | 华电电力科学研究院 | Device and method for measuring ammonia escape content in flue gas and ammonia escape content in smoke dust simultaneously |
| CN105158422B (en) * | 2015-09-30 | 2017-01-25 | 华电电力科学研究院 | Device and method for measuring ammonia escape content in flue gas and ammonia escape content in smoke dust simultaneously |
| CN105561765A (en) * | 2015-12-17 | 2016-05-11 | 北京华科仪科技股份有限公司 | Pretreatment method and device for effectively absorbing escape ammonia in smoke |
| CN105806804A (en) * | 2016-04-06 | 2016-07-27 | 杭州绰美科技有限公司 | Integrated online monitoring instrument for monitoring ammonia escape during denitration |
| CN106198860A (en) * | 2016-06-28 | 2016-12-07 | 盐城工学院 | A kind of method and system of the escaping of ammonia detection |
| CN107632119A (en) * | 2017-09-28 | 2018-01-26 | 华电新疆发电有限公司乌鲁木齐热电厂 | Comparison device and its application method for the escaping of ammonia measuring instrument |
| CN107632119B (en) * | 2017-09-28 | 2024-04-12 | 华电新疆发电有限公司乌鲁木齐热电厂 | Comparison device for ammonia escape monitoring instrument and application method thereof |
| CN111766349A (en) * | 2020-08-04 | 2020-10-13 | 浙江浙能技术研究院有限公司 | Partitioned sampling ammonia escape measurement system and method |
| CN111982610A (en) * | 2020-08-12 | 2020-11-24 | 北京国电龙源环保工程有限公司 | On-line continuous detection device for ammonia in gas by using chemical spectrophotometry |
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Application publication date: 20150325 |