CN206038527U - Coal fired power plant smoke pollutants minimum discharge on -line monitoring system - Google Patents
Coal fired power plant smoke pollutants minimum discharge on -line monitoring system Download PDFInfo
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Abstract
The utility model discloses a coal fired power plant smoke pollutants minimum discharge on -line monitoring system, including sampling unit, the blowback unit, heat tracing pipe line, demarcation unit, the dew point hygrometer, the aspiration pump, the NOX converter, analytical equipment, the data acquisition and processing transmission unit, its characterized in that: on -line monitoring system is equipped with the acidification dehumidifier between demarcation unit and dew point hygrometer for flue gas to getting into the acidification dehumidifier carries out the acidizing, and the component that prevents to await measuring in the flue gas is dissolved in the condensate, the acidification dehumidifier has marks the passageway on the spot for analytical equipment's zero point and range designation. The utility model provides a problem of sulfur dioxide, nitrogen oxide minimum discharge in the flue gas behind the accurate reliable on -line monitoring coal fired power plant SOx/NOx control how, for coal fired power plant minimum discharge technology provides the parameter, satisfy national minimum discharge on -line monitoring's requirement.
Description
Technical field
The present invention relates to the monitoring of stationary source atmosphere pollution, more particularly to coal-burning power plant's atmosphere pollution minimum discharge
On-line monitoring system.
Background technology
Minimum discharge refers to coal fired boiler of power plant during generator operation, end treatment etc., using multiple pollutant
Efficient cooperation-removal technology Based on Integrate System so as to which Air Pollutant Emission concentration substantially conforms to Gas Generator Set emission limit, i.e. cigarette
Dirt, sulfur dioxide (SO2), nitrogen oxides (NOx) concentration of emission respectively be less than 10mg/m3、35mg/m3、50mg/m3, its purpose
It is to reduce coal-burning power plant's normal atmospheric pollutant emission, is effectively improved environmental quality, implements in full minimum discharge, can be greatly reduced
Gross coal consumption rate and disposal of pollutants.
Minimum discharge CEMS is made up of many sub- monitoring systems, and its core is gaseous contaminant monitoring subsystem, i.e. SO2With
NOx monitors subsystem on-line.According to《Fixed pollution source smoke discharge continuous monitor system technical requirements and detection method》(HJ/
T76-2007) the requirement of 3.8：The greatest measurement of CEMS is set according to actual needs, emission source maximum is usually arranged as dense
1 to 2 times of degree, therefore substantially minimum discharge SO2With range (dilution all in the range of 0～100mg/Nm3 of NOx analysers
Except sampling method analyser).
At present, the sample method for being suitable for minimum discharge lower range on-line checking has dilution extraction method, cold dry straight
Take out method and heat wet directly takes out method.Environmental protection standard clear stipulaties, flue gas pollutant concentration of emission refer to the number of dry flue gas in normal conditions
The measurement of value, i.e. butt；Meanwhile, to analyze in terms of system stability, cost, system popularization etc., most ripe scheme is cold dry
Method is taken out directly.
The existing CEMS more than 90% in coal-burning power plant does method of directly taking out using cold, but traditional cold is dry directly to take out method to ultralow row
Put high water capacity, the flue gas of low concentration carries out Concentration Testing, especially less than 50mg/Nm3In the case of, certainly will be within the condenser
Condensed water is separated out, can be dissolved less than 35mg/Nm3SO2；Simultaneously as analyser is demarcated and system calibrating and actual smoke condition
Gap is big, causes analytical error, data distortion.Therefore, the accurate test SO in the case of high humility, lower range2Become biography with NOx
The cold dry technological difficulties for directly taking out method CEMS of system.
China Patent No.：201410309049.5, patent name：A kind of " polluter sulfur dioxide (SO2) emissions on-line monitoring system
System and method ", in claims 1, " a kind of polluter sulfur dioxide (SO2) emissions on-line monitoring system, the monitoring system includes pre-
Processing meanss, heater block, condensing units and detection means；It is characterized in that：The monitoring system is further included：Injection dress
Put, on pipeline of the injection device between the pretreatment unit and condenser, for implantation concentration in the pipeline
Phosphoric acid between 1-25% "；Claims 4：" second container, the fluid output port of the condensing units is in described
In second container under liquid level；Second conveyer device, second conveyer device are arranged between injection device and second container
Pipeline on；Heater, the heater are used for heating the liquid in the second container ".
Chinese Patent Application No.：CN201510147553.4, applies for a patent title：" a kind of low-concentration flue gas detection is pre- to be located
Reason water-eliminating method and device and its flue gas inspection application system, low-concentration flue gas detection pretreatment water-eliminating method ", " claim
8, it is characterised in that introducing temperature range 70-100 DEG C of acid solution in described step (2), while the connecting tube of pump and three-way valve
By winding heater strip heating on road, by winding heater strip heating on three-way valve with condenser connecting pipe, two to more than
Place's pipeline and three-way valve carry out temperature control by temperature conditioning unit, and temperature controlling range is 70-100 DEG C "；Claim 9, its
In step (2) described in being characterised by, the concentration range of introduced acid solution is 25%-85%；Claim 10, it is characterised in that
Described acid solution be perchloric acid, hydroiodic acid, sulphuric acid, hydrosulphuric acid, hydrochloric acid, nitric acid, oxalic acid, sulfurous acid, acetone acid, phosphoric acid, carbonic acid,
Nitrous acid, citric acid, Fluohydric acid., formic acid, lactic acid, benzenpropanoic acid, acrylic acid, acetic acid, propanoic acid, stearic acid, hydrosulphuric acid or hypochlorous acid,
Or the mixed solution of two or more acid.
Above art solutions are all defined to the acid strength into condensing units, while carrying out not to acid solution
With the heating in degree, SO so can be suppressed to a certain extent2、NO2Etc. dissolving of the component in water, it is ensured that determine to be measured
The accuracy of component；But such scheme there is also certain defect, 1) fail to control added acid strength, acid solution well
Concentration is excessive to be likely to result in material waste, increases waste disposal cost, or even corrosion condenser heat exchange tubes；2) without system mark
It is fixed.
Therefore, for the defect of existing Air Pollutant Emission on-line monitoring system, exploitation one kind applies to thermal power plant
Atmosphere pollution minimum discharge on-line monitoring system is significant.
The content of the invention:
In order to solve the deficiency in prior art, the invention provides a kind of ultralow row of coal-fired plant flue gas pollutant
It is placed on line monitoring system, it is adaptable to low concentration SO under minimum discharge high humidity environment2, NOx on-line monitoring.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of coal-fired plant flue gas pollutant minimum discharge on-line monitoring system, including sampling unit, backflush unit, heat tracing
Pipeline, demarcation unit, dew point hygrometer, air pump, NOx transducers, analytical equipment, data acquisition process transmission unit, its feature exist
Sour dehumidifier is provided with the on-line monitoring system between demarcation unit and dew point hygrometer, for into acid adding dehumidifier
Flue gas carries out acidification, and in preventing flue gas, component to be measured is dissolved in condensed fluid；The acid adding dehumidifier is carried and is demarcated on the spot
Passage, the zero point and range designation for analytical equipment.
Preferably, on-line monitoring system of the present invention, the acid adding dehumidifier adopt three mouthfuls of direct-cooling type heat-exchange tubes, three mouthfuls points
Not Wei air inlet, gas outlet and acid-adding port, which has been abandoned the devices such as traditional three-way valve, air stream siphunculus, has farthest subtracted
Contact area and the time of contact of flue gas and condensed water are lacked.
The acid adding dehumidifier is dehumidified using condensed in two stages, and including acid-adding port, analytical equipment demarcates entrance on the spot, and flue gas enters
Mouthful, exhanst gas outlet, two condensate outlets；Prime adopts three mouthfuls of direct-cooling type heat-exchange tubes of non-helical formula, including gas outlet, air inlet
Mouthful, acid-adding port, condensate outlet.
The acid adding dehumidifier carries three peristaltic pumps.
Acid adding dehumidifier institute acid liquid is middle strong acid acid solution, by detecting acid adding dehumidifier condensed fluid pH value, control
Acid strength processed.
Further, condensed fluid pH value≤1.5.
It is compared with the prior art, the device have the advantages that being：
1st, the integrated acid adding dehumidifier with three mouthfuls of direct-cooling type heat-exchange tubes is devised, can be to analyser or analysis dress
Put and demarcated, while the time of contact of component to be measured and acid adding dehumidifier condensed fluid and contact surface in advantageously reducing flue gas
Product, can reduce low concentration SO2, NOx Loss Rate.
2nd, acid adding concentration is adjusted by detecting condensed fluid pH value, it is to avoid merely reduce by acid strength added by improving
Low concentration SO2, NOx dissolution rates in condensed fluid defect, reduce acid adding cost, can by component amount lost to be measured control in 0-
1μmol/mol。
3rd, acid adding process or acid adding container are not heated with carrying out any degree, reduces energy consumption and maintenance.
4th, ultra-clean discharge is met to low concentration SO2, NOx total amounts on-line monitoring.
The present invention is not heated to acid adding process or sour container with carrying out any degree, devises special three mouthful direct-cooling type
Heat-exchange tube and the integrated acid adding dehumidifier with demarcation passage, by detecting that the pH value of final condensed fluid adds acid to adjust
The concentration of liquid, can control component amount lost to be measured in 0-1 μm of ol/mol, additionally, setting up NOx conversion before analytical equipment
Device, by NO2NO is converted into, the requirement that environmental standard is determined to NOx total amounts can be met.
Description of the drawings:
Fig. 1 is the connection diagram of embodiment of the present invention on-line monitoring system.
In figure, sampling unit 1, backflush unit 2 demarcate unit 3, acid adding dehumidifier 4, dew point hygrometer 5, air pump 6, NOXTurn
Parallel operation 7, infrared spectrum analyser 8, two-tube electrical heating heat traced pipeline 9.
Fig. 2 is the structural representation of acid adding dehumidifier three mouthfuls of direct-cooling type heat-exchange tubes of the first order in embodiment.
In figure, gas outlet 2-1, air inlet 2-2, acid-adding port 2-3, condensate outlet 2-4.
Fig. 3 is acid adding dehumidifier structural representation in embodiment.
In figure, acid-adding port 3-1, analytical equipment demarcate entrance 3-2, gas approach 3-3, exhanst gas outlet 3-4, condensate on the spot
Outlet 3-5 and 3-6.
Specific embodiment
With reference to the accompanying drawings and examples for the present invention is described further.
Following examples on-line monitoring system is monitored on-line for the minimum discharge of coal-fired plant flue gas pollutant, is particularly surpassed
Low concentration SO under low emission high humidity environment2, NOx on-line monitoring.
Embodiment：On-line monitoring system includes sampling unit 1, backflush unit 2, two-tube electrical heating as shown in Figure 1, mainly
Heat traced pipeline 9, demarcation unit 3, dew point hygrometer 5, air pump 6, NOx transducers 7, infrared spectrum analyser 8 and data acquisition process are passed
Defeated unit, is that monitoring system is provided with acid adding dehumidifier 4 between demarcation unit 3 and dew point hygrometer 5 in place of its main innovation, for right
Flue gas into acid adding dehumidifier carries out acidification, and in preventing flue gas, component to be measured is dissolved in condensed fluid；The acid adding is removed
Wet device 4 is carried and demarcates passage on the spot, the zero point and range designation for analytical equipment.
In embodiment, sampling unit 1, including can 0-250 DEG C of adjustable heating jacket, 180 DEG C of heating jackets of prioritizing selection；Can
1 meter -3 meters of sampling feeler lever is selected, 1.5 meters of stable for extended periods of time high-temperature heatings is preferentially chosen, can be produced because of sample in sampling process
Product reduced pressure forms heat fade, i.e. joule-thompson heat fade effect, in order to prevent flue gas in probe cavity condensation, needs
To probe component heating and thermal insulation, probe heating-up temperature 0-200 DEG C is adjustable, preferred 180 DEG C of probes.Probe is internal with primary mistake
Filter, the particulate matter in removing flue gas etc..
Backflush unit 2, it is in order to prevent probe blocking, anti-to probe and filter impulse using the timing of pre-add hot compressed air
Blow, while blowback compressed air is fully warmed-up by coil pipe simulated flue gas, prevent that temperature is too low to cause gas to condense.
Demarcate unit 3, for the system calibrating of minimum discharge on-line monitoring system, by electromagnetism Vavle switching, zero gas and
The two-tube electrical heating heat traced pipelines of range gas Jing enter sampling unit, and to flow through path consistent with flue gas for gas afterwards, can be with maximum journey
Degree ensures the precision of systematic survey, accuracy.As flue gas continuous emission on-line monitoring system is mostly using based on non-spectral red
The analyser of outer technology, steam are present all the time to Infrared jamming.Therefore, for the demarcation in on-line monitoring system, calibrating gas
Dew point temperature should be consistent with flue gas dew point temperature, that is, require zero gas, range gas all should before dehumidifier sample introduction, while zero point
Gas, range gas are with the pressure of flue gas, flow should be consistent.
Acid adding dehumidifier 4 is as shown in figure 3, condensed in two stages dehumidifying, including acid-adding port 3-1, analytical equipment demarcates entrance on the spot
3-2, gas approach 3-3, exhanst gas outlet 3-4, condensate outlet 3-5 and 3-6.Prime has been used as non-helical formula heat-exchange tube
Three mouthfuls of direct-cooling type heat-exchange tubes, as shown in Fig. 2 including gas outlet 2-1, air inlet 2-2, acid-adding port 2-3, condensate outlet 2-4.
Acid adding dehumidifier 4, with three peristaltic pumps, one of them is used for acid adding, adds certain percentage to contain in heat-exchange tube acid-adding port
The phosphoric acid of amount, monitors condensed fluid pH value, need to keep measuring pH value≤1.5 of condensate.Acid solution is led to using 1r/min peristaltic pumps
Cross delivery pipe and pump into three mouthfuls of direct-cooling type heat-exchange tubes, using two 5r/min peristaltic pumps by the condensed fluid of acid adding dehumidifier by heat friendship
Change bottom of the tube (3-5,3-6) discharge, SO2, NOx Loss Rates in condensed fluid it is low.Condensed fluid is generally pumped out using peristaltic pump, with biography
System gravity discharge is compared, and reduces maintenance amount.Conventional gravity discharge be able to cannot continue after being filled because of condensate collector
Work, so that cause serious consequence.
Acid adding dehumidifier with passage is demarcated, if not needing system calibrating, can from acid adding dehumidifier gas approach (3-3) or
Increase a bypass (i.e. analytical equipment demarcates entrance 3-2 on the spot), for the entrance of zero gas and range gas, so as to be used for analyzing
Device is demarcated on the spot.
Dew point hygrometer 5, after acid adding dehumidifier, for monitoring the dew point of the flue gas Jing after the process of acid adding dehumidifier.If super
The dew point value of setting is crossed, system will send alarm, and turn off solenoid valve for sampling and stop sampling or from bypass collection surrounding air.
NOx transducers 7, can be by NO2NO is converted to, NO keeps constant in former flue gas, so as to pass through to monitor NO measurement flue gases
Middle NOx.Nitrogen oxides in flue gas mainly have NO, NO2Composition, the content of NO typically account for more than 90%.NOx transducers can be with
With materials such as metal molybdenum, rustless steel or carbon as catalyst.In practical application, after NOx transducers, need to load fine mistake
After filter is filtered and membrane filter obtains clean flue gas, it is accurate and stable so as to obtain to enter back into infrared analysiss device
Reliable Monitoring Data.
Two-tube electrical heating heat traced pipeline 9, employs high temperature resistant sample conveying tube, in order to keep it in the work that design needs
Make temperature, employ the mode of two ends heating, than general single-ended heats more preferably, temperature is more stable, the optional 0-200 of temperature
DEG C, ultra-clean exhaust temperature is generally located on 100-200 DEG C, preferred 180 DEG C.
Application example
Step 1), using 14 μm of ol/mol (about 39.1mg/m of 99.999% high pure nitrogen of zero gas and range gas3)SO2Mark
Quasi- gas, Jing demarcate unit electromagnetic valve air inlet, into two-tube electrical heating heat traced pipeline 9, sampling unit 1, acid adding dehumidifier 4, dew
Point instrument 5 is in rack, then enters NDIR analyser 8 Jing after NOx transducers 7, carries out system calibrating to analysis system, remembers
Record humidity be 0% and do not phosphorate acid when acid adding dehumidifier when system SO2Concentration measured value, while the zero point and amount of recorder analyser
Journey is drifted about, for correcting SO2Correction value.
Step 2), phosphoric acid concentration about 5%-10%, the pH value of matched somebody with somebody acid solution is recorded by pH sensor, while detecting cold
Lime set pH value.It is 1.1 to fix phosphoric acid pH value in experiment, by steam generator simulated field high humidity environment, tests and records not
With SO during system acid adding under humidity environment2Concentration measured value.
Step 3), fixed humidity be 30%, reduce phosphoric acid pH value to 0.7, test and record system under different humidity environment
SO during acid adding2Concentration measured value.
Step 4), fixed humidity be 30%, test record system not acid adding when SO2Concentration measured value.
SO2 measured values and SO2 correction values, measurement unit is mg/m3.2 2 3
| Gas | Humidity | Acid solution | SO2Measured value | SO2Correction value | Explanation |
| N2 | 0% | Nothing | -3.4 | 0 | Logical N2Null offset |
| SO2 | 0% | Nothing | 34.5 | 37.9 | Logical SO2Span drift |
| SO2 | 5% | PH=1.1 | 34.3 | 37.7 | |
| SO2 | 10% | PH=1.1 | 34.7 | 38.1 | |
| SO2 | 15% | PH=1.1 | 34.6 | 38 | |
| SO2 | 20% | PH=1.1 | 34.6 | 38 | |
| SO2 | 25% | PH=1.1 | 34.6 | 38 | |
| SO2 | 30% | PH=1.1 | 33.8 | 37.2 | |
| SO2 | 30% | PH=0.7 | 34.9 | 38.3 | |
| SO2 | 30% | Nothing | 29.4 | 32.8 | Many experiments, 19～33/mg/m3 |
It can be seen that under high humidity environment, SO2Can be dissolved in condensed fluid, cause to lose, SO in experiment2Maximum Loss Rate
Up to 50%；Acid adding can suppress SO2Dissolving, acid stronger, inhibition is better, but as pH is reduced, effect slows down, pH ＜
After 1, difference is less, but acid adding will not be completely eliminated SO2Dissolving in condensed fluid.
In the case of phosphoric acid pH=1 or so, 40mg/m3Within SO2Under conditions of Standard Gases are within moisture 30%,
Definitely Loss Rate ＜ 1mg/m3。
Claims (6)
1. a kind of coal-fired plant flue gas pollutant minimum discharge on-line monitoring system, including sampling unit, backflush unit, heat tracing pipe
Line, demarcation unit, dew point hygrometer, air pump, NOXTransducer, analytical equipment, data acquisition process transmission unit, it is characterised in that：
The on-line monitoring system is provided with acid adding dehumidifier between demarcation unit and dew point hygrometer, for the cigarette into acid adding dehumidifier
Gas carries out acidification, and in preventing flue gas, component to be measured is dissolved in condensed fluid；The acid adding dehumidifier is logical with demarcation on the spot
Road, the zero point and range designation for analytical equipment.
2. coal-fired plant flue gas pollutant minimum discharge on-line monitoring system according to claim 1, it is characterised in that：Institute
Acid adding dehumidifier is stated using three mouthfuls of direct-cooling type heat-exchange tubes, three mouthfuls are respectively air inlet, gas outlet and acid-adding port.
3. coal-fired plant flue gas pollutant minimum discharge on-line monitoring system according to claim 1, it is characterised in that：Institute
State acid adding dehumidifier to dehumidify using condensed in two stages, including acid-adding port, analytical equipment demarcates entrance on the spot, and gas approach, flue gas go out
Mouthful, two condensate outlets；Prime adopts three mouthfuls of direct-cooling type heat-exchange tubes of non-helical formula, including gas outlet, air inlet, acid adding
Mouthful, condensate outlet.
4. coal-fired plant flue gas pollutant minimum discharge on-line monitoring system according to claim 3, it is characterised in that：Institute
Acid adding dehumidifier is stated with three peristaltic pumps.
5. coal-fired plant flue gas pollutant minimum discharge on-line monitoring system according to claim 1, it is characterised in that：Institute
It is middle strong acid acid solution to state acid adding dehumidifier institute acid liquid, by detecting acid adding dehumidifier condensed fluid pH value, controls acid strength.
6. coal-fired plant flue gas pollutant minimum discharge on-line monitoring system according to claim 3, it is characterised in that：Institute
State condensed fluid pH value≤1.5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106053375A (en) * | 2016-07-22 | 2016-10-26 | 南京霍普斯科技有限公司 | Ultralow emission online monitoring system for flue gas pollutants of coal-fired power plants |
| CN107957405A (en) * | 2018-01-11 | 2018-04-24 | 太原海纳辰科仪器仪表有限公司 | A kind of portable infrared flue gas analyzer |
| CN111650332A (en) * | 2020-04-30 | 2020-09-11 | 新疆天熙环保科技有限公司 | Flue gas collection and analysis method |
| CN112763445A (en) * | 2020-12-25 | 2021-05-07 | 上海琉兴环保科技有限公司 | Ultralow emission on-line monitoring system of coal fired power plant flue gas pollutant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106053375A (en) * | 2016-07-22 | 2016-10-26 | 南京霍普斯科技有限公司 | Ultralow emission online monitoring system for flue gas pollutants of coal-fired power plants |
| CN106053375B (en) * | 2016-07-22 | 2019-01-29 | 南京霍普斯科技有限公司 | A kind of coal-fired plant flue gas pollutant minimum discharge on-line monitoring system |
| CN107957405A (en) * | 2018-01-11 | 2018-04-24 | 太原海纳辰科仪器仪表有限公司 | A kind of portable infrared flue gas analyzer |
| CN111650332A (en) * | 2020-04-30 | 2020-09-11 | 新疆天熙环保科技有限公司 | Flue gas collection and analysis method |
| CN112763445A (en) * | 2020-12-25 | 2021-05-07 | 上海琉兴环保科技有限公司 | Ultralow emission on-line monitoring system of coal fired power plant flue gas pollutant |
| CN112763445B (en) * | 2020-12-25 | 2022-08-16 | 上海琉兴环保科技有限公司 | Ultralow emission on-line monitoring system of coal fired power plant flue gas pollutant |
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Effective date of registration: 20170630 Address after: 224000, Jiangsu, Yancheng City Province Salt Lake Saddle Lake Street office, Dragon Road on the south side, on the west side of the road (F) Patentee after: The Jiangsu science and Technology Development Co Ltd Address before: North building, No. 15 East Orange 05A Fengji innovation road in Yuhuatai District of Nanjing City, Jiangsu province 211500 Patentee before: NANJING HOPES TECHNOLOGY CO., LTD. |