CN105169917A - SNCR-SCR combined denitration system and method based on ammonia nitrogen molar ratio detection and regulation - Google Patents
SNCR-SCR combined denitration system and method based on ammonia nitrogen molar ratio detection and regulation Download PDFInfo
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Abstract
The invention belongs to the technical field of controlling atmospheric pollutants exhausted by coal-fired boilers, and particularly relates to an SNCR-SCR combined denitration system and method based on ammonia nitrogen molar ratio detection and regulation. The system comprises an ammonia-containing storage tank, an air preheater, an SNCR reaction zone, an SCR reaction zone, a first detection system, a second detection system, a third detection system and a control system, wherein the SNCR reaction zone is arranged in a boiler furnace, the SCR reaction zone is arranged in a boiler flue, and the first detection system, the second detection system and the third detection system are connected with the control system. The combined denitration system can achieve full-load denitration operation, is high in denitration efficiency and solves the problem of corrosion and deposition of ammonium bisulfate in follow-up equipment.
Description
Technical field
The invention belongs to the atmosphere pollution control technology field of discharged from coal-fired boiler, be specifically related to a kind of SNCR-SCR combined denitration system and method detecting based on ammonia nitrogen mol ratio and regulate and control.
Background technology
Thermal power plant coal unit is for meeting the discharge standard of GB13223-2011 " thermal power plant atmosphere pollutants emission standards " NOx, especially for meet send out change energy 2014(2093) number propose a coal unit reach " ultra-clean " emission request, coal unit must install denitrating system, could meet flue gas nitrogen oxide emission request.In denitrating technique, selective catalytic reduction (SCR), SNCR method (SNCR), SNCR+SCR United Technologies use denitration technology more widely.
SCR technique is with NH
3deng being reducing agent, at the position of catalyst, by the NO in flue gas
xbe reduced to N
2denitration rate can reach more than 90%, it is high, the most ripe denitration technology of denitration efficiency, but SCR exists following problem in running: 1) along with the change of social power structure, there is large area, long-time underrun situation in fossil-fired unit, now, SCR Reactor inlet cigarette wet temperature is lower than catalyst serviceability temperature, denitrating system stops spray ammonia, affects thermal power plant's denitrating system bringing normally into operation, affects flue gas NO
xdischarge and power plant obtain denitration valence compensation, cannot meet the requirement of power plant's full load denitration that recent National Energy Board proposes; 2) SO in flue gas
2under the effect of SCR catalyst, transform into SO
3denitration byproduct ammonium hydrogen sulfate ABS is generated with the reaction of excessive escape ammonia, cause the phenomenons such as air preheater and follow-up equipment produce Corrosion blockage, the new problems such as bag stuck with paste by sack cleaner, and air preheater pressure reduction rising has in various degree appearred in domestic a lot of unit, electric cleaner running current is low, sack cleaner pressure reduction obviously increases, flue is torn; 3) catalyst is easily poisoning, and operation and maintenance cost is high.
SNCR technique is that ammonia or urea etc. are contained amino injection of reducing agent to boiler furnace about 800 DEG C ~ 1250 DEG C regions, and under the condition not having catalyst, reducing agent fast pyrogenation is NH
3and optionally with the NO in flue gas
xreact, be reduced to N
2and H
2o.NH
3and NO
xreaction not exclusively, can cause a large amount of the escaping of ammonia.SNCR denitration efficiency is lower, and denitration efficiency is between 30% ~ 75%, and for large-scale coal-fired power station boiler, the denitration efficiency of SNCR technique, usually below 40%, solely adopts SNCR to be difficult to satisfied strict denitration requirement.Because SNCR floor space is little, operation and maintenance cost is low, still can gametic fertility under boiler at low load condition, is easy to and the advantage such as other technique coupling, is especially applicable to the transformation of old power plant.
SNCR+SCR method for combined use is denitration technology novel in recent years, and Chinese patent CN103007707B discloses adaptive SNCR and the SCR combined system of a kind of high load capacity for Industrial Boiler and method, and the top of burner hearth arranges stove inner nozzle; The gas approach of SCR reactor is connected with the afterbody of flue, and arranges SCR nozzle in junction; The reducing agent storage tank of burner hearth outside is connected with stove inner nozzle and SCR nozzle.By SNCR denitration technique in stove is combined with afterbody SCR denitration technique, realize the efficient removal of NOx in flue gas, improve the load adaptability of whole denitrating system, but, this patent SNCR and SCR can not run simultaneously, denitration efficiency cannot reach the highest scope, and exist ammonia nitrogen mol ratio be difficult to rationally, in time, accurately, continuous control and ammonium hydrogen sulfate cause equipment blocking, etching problem.
Chinese patent CN104147912A discloses a kind of SNCR method SNCR and selective catalytic reduction SCR mixed flue gas method of denitration and device, to improve the denitration efficiency of Pump for Medium and Small Power Generating Set, reduces the consumption of SCR catalyst simultaneously, cost-saving.Described denitration method for flue gas, comprises the SNCR reactions steps and SCR reactions steps of carrying out successively, only sprays into containing ammonia solution in SNCR reactions steps, and the described addition containing ammonia solution is 1 ~ 3 times of former nitrogen oxides in effluent mole; In SCR reactions steps, have neither part nor lot in SNCR reaction ammonia and flue gas in remaining nitrogen oxide continue to react.But, its shortcoming is that the ammonia amount of being escaped by SNCR conversion zone and emitted dose are not linear, amount of ammonia slip is difficult to control, also the reducing agent consumption needed for back segment SCR reactor cannot precisely be measured, and ammonia solution addition is high, still there is the problem of fouling that ammonium hydrogen sulfate causes follow-up equipment and corrosion.
Chinese patent CN102861511A discloses a kind of fire coal boiler fume SNCR and SCR combined denitration method and device, reducing agent adds the temperature window of 800 ~ 1050 DEG C, burner hearth containing ammonia solution, NOx in part ammonia and flue gas carries out SNCR reaction, and all the other escape ammonias carry out heat exchange cooling with flue gas to flue; Adding in 500 ~ 650 DEG C of humidity provinces of boiler export flue and supplement reducing agent and decomposite ammonia, is V at 300 ~ 420 DEG C and active material
2o
5and WO
3under catalyst exists, ammonia and NOx carry out SCR reaction, remove remaining NOx in flue gas.But, this patent still exist amount of ammonia slip be difficult to rationally, in time, accurately, equipment blocking that continuous control and ammonium hydrogen sulfate cause, corrosion problem.
Summary of the invention
For overcoming above-mentioned defect, the object of the present invention is to provide a kind of SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control.
For achieving the above object, the present invention adopts following technical scheme:
A kind of SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control, comprise containing ammonia storage tank, air preheater, SNCR reaction zone and SCR reaction zone, SNCR reaction zone is arranged in the burner hearth of boiler, upper furnace arranges first jet, is connected by first-class gauge containing ammonia storage tank with first jet, SCR reaction zone is arranged in boiler flue, SCR reaction zone entrance is provided with second nozzle, be connected with second nozzle by second gauge containing ammonia storage tank, air preheater respectively with lower furnace portion, flue outlet connects, also comprise the first detection system, second detection system, 3rd detection system and control system, first detection system is located at upper furnace, second detection system is located at second nozzle import department, 3rd detection system is located at SCR reaction zone exit, first detection system, second detection system, 3rd detection system, first-class gauge and second gauge connection control system respectively.
According to the above-mentioned SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control, it is in the region of 800 ~ 1100 DEG C that described first jet is arranged on flue-gas temperature in boiler.
According to the above-mentioned SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control, it is in the region of 300 ~ 410 DEG C that described second nozzle is arranged on flue-gas temperature in flue.
Another object of the present invention is also to provide a kind of SNCR-SCR combined denitration method detecting based on ammonia nitrogen mol ratio and regulate and control, equipment investment is few, full load denitration can be realized run, denitration efficiency is high, reduce SCR catalyst consumption, extending catalyst service life, reduce amount of ammonia slip, eliminate ammonium hydrogen sulfate in the corrosion of follow-up equipment and deposition problems.
Based on the SNCR-SCR combined denitration method that ammonia nitrogen mol ratio detects and regulates and controls, comprise the steps:
When boiler load≤50%, only SNCR reaction zone effect,
(1) regulate first jet to spray into containing ammonia solution to SCNR reaction zone containing ammonia storage tank by first-class gauge, make SNCR reaction zone entrance ammonia nitrogen mol ratio be 0.5 ~ 0.9:1;
(2) first detection systems detect flue-gas temperature in burner hearth, regulate first jet spray ammonia position by control system, and first jet spray ammonia position is in the region that flue-gas temperature is 800 ~ 1100 DEG C;
(3) the 3rd detection systems detect SCR reaction zone outlet ammonia and NO
xcontent, finely tunes by control system the ammonia amount that first-class gauge enters SCNR reaction zone, makes SNCR reaction zone denitration efficiency>=50%;
As boiler load > 50%, SNCR reaction zone and SCR reaction zone act on simultaneously,
(1) regulate first jet to spray into containing ammonia solution to SCNR reaction zone containing ammonia storage tank by first-class gauge, make SNCR reaction zone entrance ammonia nitrogen mol ratio be 0.5 ~ 0.9:1; Regulate second nozzle to spray into containing ammonia solution to SCR reaction zone containing ammonia storage tank by second gauge, the second detection system is detected, and SCR reaction zone entrance ammonia nitrogen mol ratio is 0.9 ~ 0.95:1 simultaneously;
(2) first detection systems detect flue-gas temperature in burner hearth, regulate first jet spray ammonia position by control system, and first jet spray ammonia position is in the region that flue-gas temperature is 800 ~ 1100 DEG C, and the second detection system detects SCR reaction zone entrance ammonia and NO
xcontent, obtains ammonia nitrogen mol ratio, regulates second gauge, make ammonia nitrogen mol ratio be 0.9 ~ 0.95:1 by control system, and the 3rd detection system detects SCR reaction zone outlet ammonia and NO
xcontent, is entered the ammonia amount of SCR reaction zone, makes SCR reaction zone export NO by control system fine setting second gauge
xcontent≤50mg/m
3.
According to above-mentioned SNCR-SCR combined denitration method, described is urea liquid or ammoniacal liquor containing ammonia solution.
According to above-mentioned SNCR-SCR combined denitration method, the described mass percentage concentration containing ammonia solution is 5 ~ 15%.
According to above-mentioned SNCR-SCR combined denitration method, the catalyst of described SCR reaction zone is V
2o
5or WO
3.
positive beneficial effect of the present invention
1. the present invention can realize full load denitration operation, and during load≤50%, only spray containing ammonia solution at SNCR reaction zone, SNCR reaction zone runs, and denitration efficiency can reach more than 50%; During load > 50%, all spray containing ammonia solution at SNCR reaction zone and SCR reaction zone, SNCR reaction zone and SCR reaction zone run, and denitration efficiency can reach more than 90%.Whole system flexible operation, denitration efficiency is high.
2. combined denitration system of the present invention comprises the first detection system, the second detection system, the 3rd detection system and control system, first detection system is located at upper furnace, detect flue-gas temperature in burner hearth, by signal feedback to control system, regulate first jet spray ammonia position; Second detection system is located at second nozzle import department, during boiler load > 50%, detects SCR reaction zone entrance ammonia and NO
xcontent, obtains ammonia nitrogen mol ratio, by signal feedback to control system, sprays into the amount containing ammonia solution by second gauge adjustment SCR reaction zone; 3rd detection system is located at SCR reaction zone exit, detects SCR reaction zone exit ammonia and NO
xcontent, by signal feedback to control system, during boiler load≤50%, finely tune first-class gauge by control system and enter the amount of SNCR reaction zone containing ammonia solution, during boiler load > 50%, enter the amount of SCR reaction zone containing ammonia solution by control system fine setting second gauge; Whole system can in time, accurately, continuous control containing the consumption of ammonia solution, automaticity is high.
3. during boiler load > 50% of the present invention, most of NO in flue gas
xin stove, SNCR removes, and the escape ammonia of front end SNCR reaction zone generation is as the reducing agent of rear end SCR reaction zone, simultaneously, escape ammonia mixes with flue gas further in flue flow process, is compared to independent SCR reaction, solves the problem that SCR reaction zone sprays ammonia in a large number, the reducing agent time of staying is long, reduce SCR reaction zone catalyst amount, extending catalyst service life, greatly reduce catalyst costs.
4. the first-class gauge of the present invention regulates SNCR reaction zone ammonia nitrogen mol ratio to be 0.5 ~ 0.9:1, and the second detection system regulates SCR reaction zone ammonia nitrogen mol ratio to be 0.9 ~ 0.95:1, during boiler load > 50%, and the 3rd detection system control NO
xcontent meet national GB13223-2011 " thermal power plant atmosphere pollutants emission standards " or send out change energy 2014(2093) number " ultra-clean " emission request, consumption ammonia amount is few, realize the denitration of unit full load, improve denitration efficiency, eliminate ammonium hydrogen sulfate ABS in the corrosion of follow-up equipment and deposition problems.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the SNCR-SCR combined denitration method that the present invention is based on the detection of ammonia nitrogen mol ratio and regulation and control;
In figure: 1-contains ammonia storage tank, the first-class gauge of 2-, 3-second gauge, 4-SNCR reaction zone, 5-air preheater, 6-SCR reaction zone, 7-first jet, 8-second nozzle, 9-first detection system, 10-second detection system, 11-the 3rd detection system, 12-control system.
Detailed description of the invention
Below in conjunction with some detailed description of the invention, the present invention is further described.
See Fig. 1, a kind of SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control, comprise containing ammonia storage tank 1, air preheater 5, SNCR reaction zone 4 and SCR reaction zone 6, SNCR reaction zone 4 is arranged in the burner hearth of boiler, upper furnace arranges first jet 7, be connected with first jet 7 by first-class gauge 2 containing ammonia storage tank 1, SCR reaction zone 6 is arranged in boiler flue, SCR reaction zone 6 entrance is provided with second nozzle 8, be connected with second nozzle 8 by second gauge 3 containing ammonia storage tank 1, air preheater 5 is connected with lower furnace portion, flue outlet respectively; Also comprise the first detection system 9, second detection system 10, the 3rd detection system 11 and control system 12, first detection system 9 is located at boiler furnace top, first detection system 10 detects flue-gas temperature in burner hearth, by signal feedback to control system 12, regulates first jet 7 to spray ammonia position; Second detection system 10 is located at second nozzle 3 import department, during boiler load > 50%, detects SCR reaction zone 6 porch ammonia and NO
xcontent, obtains ammonia nitrogen mol ratio, by signal feedback to control system 12, sprays into the amount containing ammonia solution by second gauge adjustment SCR reaction zone; 3rd detection system 11 is located at SCR reaction zone 6 exit, detects SCR reaction zone 6 and exports ammonia and NO
xcontent, by signal feedback to control system 12, during boiler load≤50%, first-class gauge 2 is finely tuned by control system, during boiler load > 50%, by control system fine setting second gauge 3, first detection system 9, second detection system 10, the 3rd detection system 11, first-class gauge 2, second gauge 3 connection control system 12 respectively.
The data acquisition of described SNCR-SCR combined denitration system is born with conversion by the first detection system 9, second detection system 10 and the 3rd detection system 11 and is realized, in first detection system 9 pairs burner hearth, the temperature value of first jet 7 each layers of position detects, adopt Radiation Temperature Measurement Instrument high temperature checkout equipment, the flue gas parameter that the second detection system 10 and the 3rd detection system 11 detect comprises following items: flue-gas temperature, flue gas pressures, flue gas flow, NOx concentration, SO
2concentration, ammonia density.Wherein smoke temperature measurement can select two platinum resistance thermometer sensor,s and stainless steel protection sleeve pipes; flue gas pressures selects pressure transmitter measurement; and primary instrument valve, secondary meter valve, blowoff valve and pipe joint are installed; flue gas flow measures the flow measuring sensor adopting orifice throttle mode, NOx, SO in flue gas
2, NH
3gas adopts flue gas analyzer to carry out continuous on-line monitoring.All Monitoring Data are sent in control system 12 with 4 ~ 20mADC or pulse signal and are carried out supervision and analysis above, and control to adjust the ammonia spraying amount of first jet 7 and second nozzle 8, make SNCR reaction zone and SCR reaction zone ammonia nitrogen mol ratio meet application claims, realize the optimization distribution of SNCR-SCR combined denitration system.
Embodiment 1
The present embodiment device is described above, and no longer repeat, wherein, first jet 7 is 4 layers of atomizing lance, and every layer arranges 10, and first jet 7 is arranged on boiler madial wall, flue-gas temperature is in the region of 800 ~ 1100 DEG C.
The present embodiment is 600MW unit, and boiler load is 50%, exhaust gas volumn about 75 × 10
4m
3/ h, in flue gas, NOx concentration is about 320mg/m
3.
Based on the SNCR-SCR combined denitration method that ammonia nitrogen mol ratio detects and regulates and controls, comprise the SNCR reactions steps and SCR reactions steps of carrying out successively, concrete steps are as follows:
(1) regulate first jet 7 to spray into containing ammonia solution to SCNR reaction zone 4 containing ammonia storage tank 1 by first-class gauge 2, containing ammonia solution to be mass percentage concentration be 5 ~ 10% urea liquid, make SNCR reaction zone 4 entrance ammonia nitrogen mol ratio be 0.85:1;
(2) first detection systems 9 detect flue-gas temperature in burner hearth, regulate first jet 7 to spray ammonia position by control system 12, and first jet spray ammonia position is in the region that flue-gas temperature is 800 ~ 1100 DEG C;
(3) the 3rd detection systems 11 detect SCR reaction zone 6 and export ammonia and NO
xcontent, finely tunes by control system 12 ammonia amount that first-class gauge 2 enters SCNR reaction zone 4, makes SNCR reaction zone denitration efficiency>=50%.
Embodiment 2
The present embodiment device is described above, and no longer repeat, wherein, first jet 7 is 4 layers of atomizing lance, and every layer arranges 10, and first jet 7 is arranged on boiler madial wall, flue-gas temperature is in the region of 800 ~ 1100 DEG C.
Second nozzle 8 is 3 layers of atomizing lance, and every layer arranges 3, and second nozzle 8 is arranged on the rear wall of reversal chamber in flue, flue-gas temperature is in the region of 300 ~ 410 DEG C.
The present embodiment boiler load is 60%, exhaust gas volumn about 120 × 10
4m
3/ h, in flue gas, NOx concentration is 560mg/m
3.
Based on the SNCR-SCR combined denitration method that ammonia nitrogen mol ratio detects and regulates and controls, concrete steps are as follows:
(1) regulate first jet 7 to spray into containing ammonia solution to SCNR reaction zone 4 containing ammonia storage tank 1 by first-class gauge 2, containing ammonia solution to be mass percentage concentration be 5 ~ 10% ammonia spirit, make SNCR reaction zone 4 entrance ammonia nitrogen mol ratio be 0.5:1; Regulate second nozzle 8 to spray into containing ammonia solution to SCR reaction zone 6 containing ammonia storage tank 1 by second gauge 3, the second detection system 10 is detected, and SCR reaction zone 6 porch ammonia nitrogen mol ratio is 0.9:1 simultaneously; The catalyst of described SCR reaction zone 6 is V
2o
5;
(2) first detection systems 9 detect flue-gas temperature in burner hearth, first jet 7 is regulated to spray ammonia position by control system 12, first jet sprays 7 ammonia positions in the region that flue-gas temperature is 800 ~ 1100 DEG C, and the second detection system 11 detects SCR reaction zone 6 porch ammonia and NO
xcontent, obtains ammonia nitrogen mol ratio, regulates second gauge 3 by control system 12, and make ammonia nitrogen mol ratio be 0.9:1, the 3rd detection system 11 detects SCR reaction zone 6 exit ammonia and NO
xcontent, finely tunes by control system 12 ammonia amount that second gauge 3 enters SCR reaction zone 6, makes SCR reaction zone 6 export NO
xcontent≤50mg/m
3.
Embodiment 3
The present embodiment device as described in Example 2, no longer repeats.
The present embodiment boiler load is 80%, exhaust gas volumn about 160 × 10
4m
3/ h, in flue gas, NOx concentration is 620mg/m
3.
Based on the SNCR-SCR combined denitration method that ammonia nitrogen mol ratio detects and regulates and controls, concrete steps are as follows:
(1) regulate first jet 7 to spray into containing ammonia solution to SCNR reaction zone 4 containing ammonia storage tank 1 by first-class gauge 2, containing ammonia solution to be mass percentage concentration be 10 ~ 15% urea liquid, make SNCR reaction zone 4 entrance ammonia nitrogen mol ratio be 0.8:1; Regulate second nozzle 8 to spray into containing ammonia solution to SCR reaction zone 6 containing ammonia storage tank 1 by second gauge 2, the second detection system 10 is detected, and SCR reaction zone 6 porch ammonia nitrogen mol ratio is 0.92:1 simultaneously; The catalyst of described SCR reaction zone 6 is WO
3;
(2) first detection systems 9 detect flue-gas temperature in burner hearth, first jet is regulated to spray ammonia 7 position by control system 12, first jet 7 sprays ammonia position in the region that flue-gas temperature is 800 ~ 1100 DEG C, and the second detection system 10 detects SCR reaction zone 6 porch ammonia and NO
xcontent, obtains ammonia nitrogen mol ratio, regulates second gauge 3 by control system 12, and make ammonia nitrogen mol ratio be 0.92:1, the 3rd detection system 11 detects SCR reaction zone exit ammonia and NO
xcontent, finely tunes by control system 12 ammonia amount that second gauge 3 enters SCR reaction zone 6, makes SCR reaction zone 6 export NO
xcontent≤50mg/m
3.
Embodiment 4
The present embodiment device as described in Example 2, no longer repeats.
The present embodiment boiler load is 100%, exhaust gas volumn about 210 × 10
4m
3/ h, in flue gas, NOx concentration is 600mg/m
3.
Based on the SNCR-SCR combined denitration method that ammonia nitrogen mol ratio detects and regulates and controls, concrete steps are as follows:
(1) regulate first jet 7 to spray into containing ammonia solution to SCNR reaction zone 4 containing ammonia storage tank 1 by first-class gauge 2, containing ammonia solution to be mass percentage concentration be 5 ~ 10% ammonia spirit, make SNCR reaction zone 4 entrance ammonia nitrogen mol ratio be 0.9:1; Regulate second nozzle 8 to spray into containing ammonia solution to SCR reaction zone 6 containing ammonia storage tank 1 by second gauge 2, the second detection system 10 is detected, and SCR reaction zone porch ammonia nitrogen mol ratio is 0.95:1 simultaneously; The catalyst of described SCR reaction zone 6 is V
2o
5;
(2) first detection systems 9 detect flue-gas temperature in burner hearth, first jet 7 is regulated to spray ammonia position by control system 12, first jet 7 sprays ammonia position in the region that flue-gas temperature is 800 ~ 1100 DEG C, and the second detection system 10 detects SCR reaction zone 4 porch ammonia and NO
xcontent, obtains ammonia nitrogen mol ratio, regulates second gauge 3 by control system 12, and make ammonia nitrogen mol ratio be 0.95:1, the 3rd detection system 11 detects SCR reaction zone 6 exit ammonia and NO
xcontent, finely tunes by control system 12 ammonia amount that second gauge 3 enters SCR reaction zone 6, makes SCR reaction zone 6 export NO
xcontent≤50mg/m
3.
The SNCR-SCR combined denitration system and method denitration result detecting based on ammonia nitrogen mol ratio and regulate and control of the embodiment of the present invention 1 ~ 4 is in table 1.
Table 1 embodiment of the present invention 1 ~ 4 denitration result
。
As can be seen from Table 1, the removal efficiency of combined denitration system and method to nitrogen oxides in effluent NOx of the embodiment of the present invention 1 ~ 4 is respectively 72%, 93%, 95%, 96%, whole system can in time, accurately, continuous control containing ammonia solution consumption, automaticity is high, denitration efficiency is high, and corrosion and the deposition of ammonium hydrogen sulfate ABS do not appear in follow-up equipment yet.
Claims (7)
1. the SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control, comprise containing ammonia storage tank, air preheater, SNCR reaction zone and SCR reaction zone, SNCR reaction zone is arranged in the burner hearth of boiler, upper furnace arranges first jet, is connected by first-class gauge containing ammonia storage tank with first jet, SCR reaction zone is arranged in boiler flue, SCR reaction zone entrance is provided with second nozzle, be connected with second nozzle by second gauge containing ammonia storage tank, air preheater respectively with lower furnace portion, flue outlet connects, it is characterized in that, also comprise the first detection system, second detection system, 3rd detection system and control system, first detection system is located at upper furnace, second detection system is located at second nozzle import department, 3rd detection system is located at SCR reaction zone exit, first detection system, second detection system, 3rd detection system, first-class gauge and second gauge connection control system respectively.
2. the SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control according to claim 1, it is characterized in that, it is in the region of 800 ~ 1100 DEG C that described first jet is arranged on flue-gas temperature in boiler.
3. the SNCR-SCR combined denitration system detecting based on ammonia nitrogen mol ratio and regulate and control according to claim 1, it is characterized in that, it is in the region of 300 ~ 410 DEG C that described second nozzle is arranged on flue-gas temperature in flue.
4. the SNCR-SCR combined denitration method detecting based on ammonia nitrogen mol ratio and regulate and control utilizing the combined denitration system described in any one of claim 1 ~ 3 to carry out, is characterized in that, comprise the steps:
When boiler load≤50%, only SNCR reaction zone effect,
(1) regulate first jet to spray into containing ammonia solution to SCNR reaction zone containing ammonia storage tank by first-class gauge, make SNCR reaction zone entrance ammonia nitrogen mol ratio be 0.5 ~ 0.9:1;
(2) first detection systems detect flue-gas temperature in burner hearth, regulate first jet spray ammonia position by control system, make first jet spray ammonia position in the region that flue-gas temperature is 800 ~ 1100 DEG C;
(3) the 3rd detection systems detect SCR reaction zone outlet ammonia and NO
xcontent, finely tunes by control system the ammonia amount that first-class gauge enters SCNR reaction zone, makes SNCR reaction zone denitration efficiency>=50%;
As boiler load > 50%, SNCR reaction zone and SCR reaction zone act on simultaneously,
(1) regulate first jet to spray into containing ammonia solution to SCNR reaction zone containing ammonia storage tank by first-class gauge, make SNCR reaction zone entrance ammonia nitrogen mol ratio be 0.5 ~ 0.9:1; Regulate second nozzle to spray into containing ammonia solution to SCR reaction zone containing ammonia storage tank by second gauge, the second detection system is detected, and SCR reaction zone entrance ammonia nitrogen mol ratio is 0.9 ~ 0.95:1 simultaneously;
(2) first detection systems detect flue-gas temperature in burner hearth, regulate first jet spray ammonia position by control system, and make first jet spray ammonia position in the region that flue-gas temperature is 800 ~ 1100 DEG C, the second detection system detects SCR reaction zone entrance ammonia and NO
xcontent, obtains ammonia nitrogen mol ratio, regulates second gauge, make ammonia nitrogen mol ratio be 0.9 ~ 0.95:1 by control system, and the 3rd detection system detects SCR reaction zone outlet ammonia and NO
xcontent, is entered the ammonia amount of SCR reaction zone, makes SCR reaction zone export NO by control system fine setting second gauge
xcontent≤50mg/m
3.
5. SNCR-SCR combined denitration method according to claim 4, is characterized in that, described is urea liquid or ammoniacal liquor containing ammonia solution.
6. SNCR-SCR combined denitration method according to claim 5, is characterized in that, the described mass percentage concentration containing ammonia solution is 5 ~ 15%.
7. SNCR-SCR combined denitration method according to claim 4, is characterized in that, the catalyst of described SCR reaction zone is V
2o
5or WO
3.
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| CN106390717A (en) * | 2016-11-30 | 2017-02-15 | 东方电气集团东方锅炉股份有限公司 | Denitration flue for SCR and SNCR combined denitration |
| CN106582285A (en) * | 2016-12-29 | 2017-04-26 | 华电电力科学研究院 | Multi-stage ammonia spraying efficient SCR flue gas denitrification system |
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| CN107185376A (en) * | 2017-06-14 | 2017-09-22 | 山西大学 | A kind of flue gas reuse reinforcing SNCR combines SCR denitrating system |
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| CN113431667A (en) * | 2021-07-28 | 2021-09-24 | 潍柴动力股份有限公司 | SCR robustness control method and device |
| CN116139667A (en) * | 2022-11-23 | 2023-05-23 | 清华大学 | Denitration reducing agent double-stage linkage control method and device, electronic equipment and storage medium |
| CN116139667B (en) * | 2022-11-23 | 2024-04-09 | 清华大学 | Denitration reducing agent double-stage linkage control method and device, electronic equipment and storage medium |
| CN117582798A (en) * | 2024-01-15 | 2024-02-23 | 河北高科环保集团有限公司 | Low-resistance efficient composite denitration device for boiler flue gas and control method thereof |
| CN117582798B (en) * | 2024-01-15 | 2024-04-09 | 河北高科环保集团有限公司 | Low-resistance efficient composite denitration device for boiler flue gas and control method thereof |
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