CN102553421A - Denitration method in SNCR (selective non catalytic reduction) furnace for exactly realizing temperature window tracking - Google Patents
Denitration method in SNCR (selective non catalytic reduction) furnace for exactly realizing temperature window tracking Download PDFInfo
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- CN102553421A CN102553421A CN2012100184237A CN201210018423A CN102553421A CN 102553421 A CN102553421 A CN 102553421A CN 2012100184237 A CN2012100184237 A CN 2012100184237A CN 201210018423 A CN201210018423 A CN 201210018423A CN 102553421 A CN102553421 A CN 102553421A
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Abstract
The invention relates to a denitration method in an SNCR (selective non catalytic reduction) furnace for exactly realizing temperature tracking, aiming at exactly realizing jetting by correspondingly adjusting the jetting quantity of reducing agent in the furnace according to furnace temperature change, furnace fire burning state and burning stage timely. In order to achieve the aim, the denitration method in the SNCR furnace for exactly realizing temperature tracking is adopted so that jetting points are determined according to a temperature curve obtained by temperature induction equipment which is originally in the furnace, and temperature inductive probes are arranged around the jetting points required in the furnace. The method comprises the following steps of: (1) during jetting, firstly judging the work states of the furnace by the temperature inductive equipment which is originally in the furnace, wherein the work states comprise a blow-in state, a normal work state and a blow-out state; (2) after the state is confirmed, extracting the temperatures around the corresponding jetting points; computing the temperatures, and according to the change curve of the different work states, obtaining the temperatures of the corresponding points in the furnace during the next jetting; and (3) computing jetting quantity according to the temperatures, sending out a command by means of master control, and jetting according to quantity.
Description
Technical field
The present invention relates to a kind of method of denitration, the SNCR denitration in the stove method that particularly accurate realization temperature is followed the trail of.
Background technology
Atmosphere pollution mainly comes from the Industrial Boiler smoke emissioning pollution, like: Ferrous Metallurgy, Chemical Manufacture, thermal power generation, all be heavily contaminated discharging unit.In conventional art or the prior art, the control of fume emission is mainly contained gravitational dust collection, centrifugal dust-removing, bag-type dust, electrostatic precipitation, wet dust removal etc., all, played certain effect reducing dust pollution in the fume emission.But to the toxic and harmful that gives off, effect is very limited.For method of denitration, divided two kinds, a kind of is the CNR mode, this complex structure in the past; Be applicable to large-sized boiler, it involves great expense, and another kind of mode is the SNCR mode, and this mode is applicable to miniature boiler; It is cheap, but poor effect, certainly; The volume of boiler own is little, and discharge capacity is not necessarily very big, and this also is that the user selects this mode reason; And in recent years, because increasingly high to the requirement of environmental emission amount, common fixed form has satisfied not the requirement of environment department.Existing SNCR mode is faced with acid test, because SNCR is directly with reducing agent, therefore has two large problems, and the one, stove fire temperature is indefinite, and two, indefinite in emitted dose.Nitrogen oxide NOX generates approach generally has three kinds, and < 1>heating power type, oxidation at high temperature generate NOX.< 2>fuel type, refer to contain in the fuel nitride and combine with oxygen, at high temperature generate NOX.< 3>fast type, refer under the cold flame exist the NOX accounting that generates less than 5% owing to contain carbon radicals.When ignition temperature is lower than 1300 when spending, almost there is not heating power type NOX to produce.Conventional boiler NOX is mainly produced through fuel type generation approach.The measure of control NOX draining technology: the one, reduce ignition temperature, reduce the NOX growing amount.The 2nd, the NOX that has generated is removed in stove or in the flue.As NOX hybrid reaction in reducing agent and the flue gas, SNCR is exactly that the SNCR technology is called for short with ammonia.Spray ammonia process reductive NO X has relatively high expectations to operating ambient temperature, only in this narrow temperature of 850-1050 degree, carries out.For this selection and control to injector installation site, spray angle, injection flow seems very important.
Summary of the invention
Goal of the invention of the present invention provide a kind of can be in real time based on furnace temperature variation, stove fire fired state, combustion phases, come corresponding adjusting furnace injection reduction dosage, come accurately to realize the purpose of spraying.
For solving the problems of the technologies described above; The present invention is achieved in that the SNCR denitration in the stove method that a kind of accurate realization temperature window is followed the trail of; It is characterized in that; According to the temperature curve that original temperature sensing apparatus in the stove draws, confirm spray site, in stove, need the peripheral mounting temperature inductive probe of spray site;
(1) when spraying, at first judged which kind of duty of processing of boiler by original temperature sensing apparatus in the stove: be respectively the blow-on state, normal operating conditions is closed the stove state;
(2) confirm state after, extract the peripheral temperature of respective spray point; Temperature is calculated, pressed the change curve of different operating state, draw when spraying, the temperature of respective point in the stove;
(3) according to the temperature computation emitted dose, give an order by total control, spray according to quantity.
This programme mainly is a rule of utilizing the stove internal combustion, at first confirms the position of big spray site, further will be divided into three different operating states; Under the different working state, be suitable for different spray site and emitted doses; The size with emitted dose of bursting out of said spray site; Program by total control is established by thing is surely carried out; Total control can draw the residing state of boiler according to the variation of respective point furnace temperature, according to state and stove fire curve; Judge the temperature when spraying, set emitted dose and injection proportion according to injection temperation.
Technique scheme is done further refinement: the peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; It installs two up and down respectively, its topmost, distance about distance one distance is bottom reached by jetting fluid.For the detection of temperature, we can not only understand certain a bit or 2 temperature, because furnace inner environment is complicated; Certain a bit or 2 temperature can not represent the temperature of spray site periphery; Spraying in addition also is that certain limit is arranged, and the temperature of test temperature when spraying has part to postpone, therefore; When detected temperatures, we will try one's best detects big scope.In addition, the mode up and down that this programme adopts is in order to be applicable to normal conditions, feelings, variation of temperature, difference about only can producing.Because fire is high or the low height that can influence temperature that waits of fire; And can not influence for periphery.Therefore, we with test point be placed in spray site about.
Technique scheme is done further refinement, and described spray site becomes parabolic to arrange from furnace bottom to floss hole.For temperature detection in the stove, there is the people can detect bottom temp in the prior art, and for the SCNR system that has now in the technology; Can specking be set at furnace bottom to nobody, mainly contain 2 reasons, the one, think at this moment do not having the appearance of nitre; Content is few in other words, therefore there is no need, and two can not use injection here; Exert an influence because be afraid of the temperature when opening, the stove fire intensification can be accepted influence.And because the increase of people's requirement, for boiler the startup stage, we still will handle.Then in the bottom spray site is being installed in me, through variation of temperature, the judgment task state again according to temperature, carries out accurate Calculation to emitted dose; Thereby do not influencing denitration under the prerequisite that starts and heat up.
Along with the long of temperature raises, the furnace bottom edge, still sprayable under special situation; As long as continue it is monitored; Under suitable occasion, reducing agent still can spray, and the rising of temperature makes the rising of spray site in addition; When operate as normal, accomplish by parabola upper flat skating area; At this moment, under the situation that fire is the highest in stove, the work spray site is transferred to the floss hole place again, and the flue-gas temperature has here reached injection temperation, and the injection of this moment no longer is aimed at burning things which may cause a fire disaster, but carries out to flue gas.When closing stove, the return course of just going further.This design is just quite perfect, the dead angle that can not produce injecting time point.
Technique scheme is done further to improve, and the peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; Install two about it respectively, of its high order end, distance about being reached by jetting fluid apart from one distance of low order end.This programme is to set for the dead angle of reducing the space more, in the stove of complicacy, some corners might occur, and these turnings, owing to depositing of particularity, they may be long spray site; Therefore, at some special stove halls, we design the detected temperatures about spray site; Increase spray site with this; Except fixing injection, also can regulate direction in this spray site that also is noted that in this programme to be introduced, and can intelligence, spray with the fixed point that temperature is pointed to.
Last technical scheme is done further to improve, and it also comprises a fume emission detector; The flue gas content information of outlet is reached control centre, and according to the exhaust gas volumn in single time, contained CO, O2 flue gas flow, and the temperature in the stove calculate the back and set spray volume by control centre.Because the combustion case in the stove hall is complicated, except setting up according to traditional analysis, we have also set the discharge capacity detection, realize moving constantly the detection, dynamically arrange emitted dose; Thereby reduce escape phenomenon more.
We draw the integrity scheme of a summing-up to such scheme: the peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; It installs two up and down respectively, its topmost, distance about distance one distance is bottom reached by jetting fluid; The peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; Install two about it respectively, of its high order end, distance about being reached by jetting fluid apart from one distance of low order end; Described spray site becomes parabolic to arrange from furnace bottom to floss hole;
It comprises a fume emission detector; The flue gas content information of outlet is reached control centre, and according to the exhaust gas volumn in single time, contained CO, O2 flue gas flow, and the temperature in the stove calculate the back and set spray volume by control centre;
Be provided with the air quantity checkout equipment at the air outlet place,, information be sent to control centre through obtaining the size of air output, by by control centre according to air output in single time and the relation between the temperature, calculate emitted dose according to formula.
In a word; This patent is according to existing boiler combustion temperature history record and on-the-spot multi-point temp actual measurement parameter and boiler CFD analysis result, simultaneously according to the boiler operatiopn air quantity; Comprehensive contrast reaction temperature and two parameters of reaction time, the optimization selection position of opening.According to procedure auto-control reducing agent discharge rate, escape according to flue gas measured data NOX, NH 3, CO, O2 flue gas flow, system confirms the injection of reducing agent amount of jet through calculating.Different combustion phases adopt different reducing agent formula rates to realize accurately following the trail of
Different combustion phases in different running method; Whether at first meet with temperature, working environment, determining whether needs to spray and the spray angle position if needing; Utilize the injection prescription to control injection, adopt the parameter of online detection NO X discharging and the escaping of ammonia to confirm emitted dose simultaneously.
The parameter that also adopts online detection NOX discharging and NH3 to escape is simultaneously confirmed emitted dose.Said different combustion case refers to the combustion case that boiler moves when different load.As: boiler is under the light(-duty) service state, and coal-supplying amount reduces, air quantity turns down, the minimizing of flue gas flow at this moment, flow velocity slows down, the exhaust smoke level when totally exhaust smoke level is less than oepration at full load, comparatively speaking, the NOX emissions data will reduce.This moment, emitted dose can reduce under PLC control automatically.Coal-supplying amount reduces during light(-duty) service, air quantity turns down, and combustion temperature in hearth and exhaust gas temperature also can reduce, and owing to SNCR denitration in the stove method, operating temperature is defined as the 850-1050 degree, and when ignition temperature is lower than 850 when spending, injector can stop to spray ammonia.In a word, the method for operation of boiler: start to on-load at full capacity from black furnace, again by at full capacity to light load to blowing out, the process of whole service, temperature, air quantity, smoke discharge amount all are rendered as one and rise gradually or the curvilinear trend of decline gradually.The different phase of different running method can bring the variation of temperature, air quantity, flue gas discharge capacity, and the variation of above-mentioned key element has determined the variation of injector ammonia spraying amount again to the variation of coal-supplying amount in the stove.No matter that a kind of method of operation, the coal-supplying amount in the above-mentioned key element, air quantity, temperature, flue gas discharge capacity all are rendered as one and edge up or gradually fall process.For the SNCR denitration in the stove method that realizes that the accurate temperature window is followed the trail of; In conjunction with above-mentioned each factor change characteristic; With several kinds of native modes of boiler operatiopn; Operational factors such as the coal-supplying amount under different phase, air quantity, temperature, flue gas discharge capacity are provided with fixing and the establishment input program, realize accurately following the trail of the objective through the PLC automatic control system.After sampling, tracking, control system set up, remaining was exactly how to utilize the ammonia solution formula rate to realize accurate tracking.
Said utilization is sprayed prescription and is controlled injection, refers in ammonia solution, to add a certain proportion of demineralized water, and the concentration of ammonia solution is provided with according to us; Different running method; Different phase, sampling, the needs of following the tracks of, controlling are set also establishment input program.So just can be under the control of PLC, realize denitration in the stove dispute ammonia amount and concentration ratio, change by boiler operatiopn mode and operational factor, reach accurately and follow the trail of the objective.
Description of drawings
Fig. 1 is a design flow diagram of the present invention.
Fig. 2 is that stove hall internal spray point of the present invention is deployed figure.
The specific embodiment
For the characteristics of the present invention of understanding further, the present invention is further described below in conjunction with accompanying drawing:
The SNCR denitration in the stove method that a kind of accurate realization temperature window is followed the trail of, the temperature curve that will draw according to original temperature sensing apparatus 5 in the stove hall 1 is before this confirmed the position of spray site 2; Certainly; For also can some special corner's individual setting heat detectors being monitored separately in the special stove hall 1, through drawing its variation of temperature curve after the long-term induction; Thereby determine whether to install spray site, in stove, need the peripheral mounting temperature inductive probe of spray site.To the design of the point that sprays, we cast aside mentality of designing in the past, all design 7 places in the air port in the past, or let the liquid that gushes out parallel with wind as far as possible; And for the design of this patent, because when spraying, liquid own has Compressed Gas; Therefore, do not worry two as for jet length; We are main in this patent to consider aspect two, first temperature, and it two is and the contacting of flue gas; Therefore adopted to let jet 2 follow flame to walk, be designed to parabolic.Come the requirement of satisfied temperature with this, with the flue gas contact problems, we drive reducing agent with compressed air to spray, and puncture the wind that air port 7 blows into as far as possible, thereby reach the purpose that fully contacts with flue gas.Be to let the spray gun that sprays have the anglec of rotation on the other hand, can strengthen like this and the contacting of flue gas.Around the corner, with the nearer position of flue 3, because the particularity at this place; Because of its temperature obviously is lower than an interior temperature less, so under the situation of normal combustion, this is located according to circumstances; Can keep sustained firing basically, so we also are provided with a turning spray site 6 at this.
Nitrogen oxide NOX generates approach generally has three kinds, and < 1>heating power type, oxidation at high temperature generate NOX.< 2>fuel type, refer to contain in the fuel nitride and combine with oxygen, at high temperature generate NOX.< 3>fast type, refer under the cold flame exist the NOX accounting that generates less than 5% owing to contain carbon radicals.When ignition temperature is lower than 1300 when spending, almost there is not heating power type NOX to produce.Conventional boiler NOX is mainly produced through fuel type generation approach.The measure of control NOX draining technology: the one, reduce ignition temperature, reduce the NOX growing amount.The 2nd, the NOX that has generated is removed in stove or in the flue.As NOX hybrid reaction in reducing agent and the flue gas, SNCR is exactly that the SNCR technology is called for short with ammonia.Spray ammonia process reductive NO X has relatively high expectations to operating ambient temperature, only in this narrow temperature of 850-1050 degree, carries out.For this selection and control to injector installation site, spray angle, injection flow seems very important.
When spraying, at first judged which kind of duty of processing of boiler by original temperature sensing apparatus in the stove: be respectively the blow-on state, normal operating conditions is closed the stove state; Under the different working state, be suitable for different spray site and emitted doses; The size with emitted dose of bursting out of said spray site; Program by total control is established by thing is surely carried out; Total control can draw the residing state of boiler according to the variation of respective point furnace temperature, according to state and stove fire curve; Judge the temperature when spraying, set emitted dose and injection proportion according to injection temperation.
After confirming state, extract the temperature of respective spray point periphery; Temperature is calculated, pressed the change curve of different operating state, draw when spraying, the temperature of respective point in the stove.Because we obtain temperature is that small difference is arranged with spraying the temperature of advancing in fact,, can react at short notice although present technology is very flourishing; But, if there is not the support of state, when critical point; Our injection produces environment damage possibly; For this reason, we will understand state earlier, dispose emitted dose according to the operation curve of temperature under this state then.For prepare more, more suitable understanding discharge capacity constantly, in the outlet of flue, set up fume emission detector 4; According to the discharging composition of flue gas content, indexs of correlation such as unit discharge are after confirming state; Obtain above-mentioned information for the analysis discharge capacity that goes on foot once, emissions profile all is considerable, certainly; Also want simultaneously at air inlet monitoring to be set, intake is monitored, and obtains the size of corresponding air quantity and the relation curve between the temperature equally.
By above-mentioned temperature when drawing next and spraying, again according to the temperature computation emitted dose, give an order by total control, spray according to quantity.The injection prescription that draws like this, emitted dose, accurate etc. relevant information, and then improved the denitrating technique level.
Claims (7)
1. accurately realize the SNCR denitration in the stove method that temperature window is followed the trail of for one kind, it is characterized in that,, confirm spray site, in stove, need the peripheral mounting temperature inductive probe of spray site according to the temperature curve that original temperature sensing apparatus in the stove draws;
(1) when spraying, at first judged which kind of duty of processing of boiler by original temperature sensing apparatus in the stove: be respectively the blow-on state, normal operating conditions is closed the stove state;
(2) confirm state after, extract the peripheral temperature of respective spray point; Temperature is calculated, pressed the change curve of different operating state, draw when spraying next time the temperature of respective point in the stove;
(3) according to the temperature computation emitted dose, give an order by total control, spray according to quantity.
2. the SNCR denitration in the stove method that a kind of accurate realization temperature window according to claim 1 is followed the trail of, it is characterized in that: the peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; It installs two up and down respectively, its topmost, distance about distance one distance is bottom reached by jetting fluid.
3. the SNCR denitration in the stove method that a kind of accurate realization temperature window according to claim 1 is followed the trail of is characterized in that: described spray site becomes parabolic to arrange from furnace bottom to floss hole.
4. the SNCR denitration in the stove method that a kind of accurate realization temperature window according to claim 1 is followed the trail of, it is characterized in that: the peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; Install two about it respectively, of its high order end, distance about being reached by jetting fluid apart from one distance of low order end.
5. the SNCR denitration in the stove method that a kind of accurate realization temperature window according to claim 1 is followed the trail of, it is characterized in that: it also comprises a fume emission detector; The flue gas content information of outlet is reached control centre, and according to the exhaust gas volumn in single time, contained CO, O2 flue gas flow, and the temperature in the stove calculate the back and set spray volume by control centre.
6. the SNCR denitration in the stove method that a kind of accurate realization temperature window according to claim 1 is followed the trail of; It is characterized in that: be provided with the air quantity checkout equipment at the air outlet place; Through obtaining the size of air output; Information is sent to control centre, according to air output in single time and the relation between the temperature, calculates emitted dose according to formula by control centre.
7. the SNCR denitration in the stove method that a kind of accurate realization temperature window according to claim 1 is followed the trail of, it is characterized in that: the peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; It installs two up and down respectively, its topmost, distance about distance one distance is bottom reached by jetting fluid; The peripheral mounting temperature inductive probe of described spray site specifically is meant about spray site; Install two about it respectively, of its high order end, distance about being reached by jetting fluid apart from one distance of low order end; Described spray site becomes parabolic to arrange from furnace bottom to floss hole;
It comprises a fume emission detector; The flue gas content information of outlet is reached control centre, and according to the exhaust gas volumn in single time, contained CO, O2 flue gas flow, and the temperature in the stove calculate the back and set spray volume by control centre;
Be provided with the air quantity checkout equipment at the air outlet place,, information be sent to control centre through obtaining the size of air output, by by control centre according to air output in single time and the relation between the temperature, calculate emitted dose according to formula.
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| CN103423766A (en) * | 2013-07-18 | 2013-12-04 | 武汉九州三维燃烧科技有限公司 | Combustion regulating method of improving SNCR denitration efficiency |
| CN104001420A (en) * | 2014-06-09 | 2014-08-27 | 盐城工学院 | Flue gas SNCR (selective non-catalytic reduction) denitration control device and method |
| CN104501195A (en) * | 2014-12-11 | 2015-04-08 | 杭州塘栖热电有限公司 | Chain furnace and denitration method for chain furnace |
| CN105214468A (en) * | 2014-06-10 | 2016-01-06 | 四川大学 | The ammoniacal liquor spray method of cement decomposing furnace SNCR method denitrating system and flusher |
| CN106669406A (en) * | 2017-03-03 | 2017-05-17 | 东北师范大学 | Denitrified accurate urea spraying device based on double sensors |
| CN107991885A (en) * | 2017-12-28 | 2018-05-04 | 华能吉林发电有限公司长春热电厂 | A kind of coal-burning power plant's denitration spray ammonia autocontrol method and system |
| CN109200779A (en) * | 2017-07-04 | 2019-01-15 | 北京英斯派克科技有限公司 | A kind of device and method for the combustion zone denitration of carbon electrode open roasting furnace |
| CN110513702A (en) * | 2019-08-19 | 2019-11-29 | 上海南一环保科技有限公司 | A kind of waste incinerator denitration adjustable spray equipment and SNCR denitration system |
| CN114100330A (en) * | 2021-11-08 | 2022-03-01 | 北京云岚科技有限公司 | Ammonia spraying automatic control method and system for nitrogen oxide emission of industrial enterprise |
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| CN103423766B (en) * | 2013-07-18 | 2016-03-02 | 武汉九州三维燃烧科技有限公司 | A kind of firing optimization method improving SNCR denitration efficiency |
| CN103423766A (en) * | 2013-07-18 | 2013-12-04 | 武汉九州三维燃烧科技有限公司 | Combustion regulating method of improving SNCR denitration efficiency |
| CN104001420A (en) * | 2014-06-09 | 2014-08-27 | 盐城工学院 | Flue gas SNCR (selective non-catalytic reduction) denitration control device and method |
| CN104001420B (en) * | 2014-06-09 | 2016-01-20 | 盐城工学院 | The control method of a kind of flue gas SNCR denitration control device and use thereof |
| CN105214468B (en) * | 2014-06-10 | 2018-05-01 | 四川大学 | The ammonium hydroxide spray method and flusher of cement decomposing furnace SNCR method denitrating systems |
| CN105214468A (en) * | 2014-06-10 | 2016-01-06 | 四川大学 | The ammoniacal liquor spray method of cement decomposing furnace SNCR method denitrating system and flusher |
| CN104501195A (en) * | 2014-12-11 | 2015-04-08 | 杭州塘栖热电有限公司 | Chain furnace and denitration method for chain furnace |
| CN104501195B (en) * | 2014-12-11 | 2017-05-31 | 杭州塘栖热电有限公司 | A kind of chain furnace and chain furnace method of denitration |
| CN106669406A (en) * | 2017-03-03 | 2017-05-17 | 东北师范大学 | Denitrified accurate urea spraying device based on double sensors |
| CN109200779A (en) * | 2017-07-04 | 2019-01-15 | 北京英斯派克科技有限公司 | A kind of device and method for the combustion zone denitration of carbon electrode open roasting furnace |
| CN107991885A (en) * | 2017-12-28 | 2018-05-04 | 华能吉林发电有限公司长春热电厂 | A kind of coal-burning power plant's denitration spray ammonia autocontrol method and system |
| CN110513702A (en) * | 2019-08-19 | 2019-11-29 | 上海南一环保科技有限公司 | A kind of waste incinerator denitration adjustable spray equipment and SNCR denitration system |
| CN114100330A (en) * | 2021-11-08 | 2022-03-01 | 北京云岚科技有限公司 | Ammonia spraying automatic control method and system for nitrogen oxide emission of industrial enterprise |
| CN114100330B (en) * | 2021-11-08 | 2024-04-23 | 北京云岚科技有限公司 | Ammonia spraying automatic control method and system for nitrogen oxides discharged by industrial enterprises |
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